:root {
  --bg: #f7fbf7;
  --bg-accent: #eef9f0;
  --surface: #ffffff;
  --surface-soft: #f1fbf4;
  --surface-strong: #e6f8ea;
  --line: #d9e7dc;
  --line-strong: #b8e8c4;
  --text: #1f2920;
  --muted: #6c786f;
  --green: #11bf55;
  --green-deep: #069946;
  --orange: #ff8700;
  --orange-soft: #fff0df;
  --shadow: 0 18px 45px rgba(17, 55, 27, 0.08);
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --font-ui: "Trebuchet MS", "Gill Sans", sans-serif;
  --font-reading: Georgia, "Times New Roman", serif;
  --brand-indigo: #2d2773;
  --grid-size: 36px;
  --pointer-x: 50vw;
  --pointer-y: 140px;
  --pointer-active: 0;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html.is-ielts-exam-view,
body.is-ielts-exam-view {
  height: 100%;
  overflow: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  font-family: var(--font-ui);
  color: var(--text);
  background: #fff;
}

.ambient-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff 0%, #fbfcff 46%, #ffffff 100%);
}

.ambient-grid-base,
.ambient-grid-pointer,
.ambient-grid-glow,
.ambient-grid-corner {
  position: absolute;
  inset: 0;
}

.ambient-grid-base,
.ambient-grid-pointer,
.ambient-grid-corner {
  background-size: var(--grid-size) var(--grid-size);
  background-position: calc(var(--grid-size) / 2) calc(var(--grid-size) / 2);
  background-repeat: repeat;
  background-image: radial-gradient(circle, rgba(156, 166, 178, 0.34) 0 0.9px, transparent 1.24px);
}

.ambient-grid-base {
  opacity: 0.54;
  filter: blur(0.82px);
  transform: scale(1.01);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.82) 0%, rgba(0, 0, 0, 0.58) 44%, rgba(0, 0, 0, 0.18) 76%, transparent 100%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.82) 0%, rgba(0, 0, 0, 0.58) 44%, rgba(0, 0, 0, 0.18) 76%, transparent 100%);
}

.ambient-grid-corner {
  background-image: radial-gradient(circle, rgba(92, 118, 232, 0.36) 0 0.96px, transparent 1.34px);
  opacity: 0.07;
  filter: blur(0.45px);
}

.ambient-grid-corner-left {
  -webkit-mask-image: radial-gradient(ellipse 360px 280px at 11% 10%, rgba(0, 0, 0, 0.86) 0%, rgba(0, 0, 0, 0.72) 28%, rgba(0, 0, 0, 0.24) 56%, transparent 80%);
  mask-image: radial-gradient(ellipse 360px 280px at 11% 10%, rgba(0, 0, 0, 0.86) 0%, rgba(0, 0, 0, 0.72) 28%, rgba(0, 0, 0, 0.24) 56%, transparent 80%);
}

.ambient-grid-corner-right {
  -webkit-mask-image: radial-gradient(ellipse 360px 280px at 89% 10%, rgba(0, 0, 0, 0.86) 0%, rgba(0, 0, 0, 0.72) 28%, rgba(0, 0, 0, 0.24) 56%, transparent 80%);
  mask-image: radial-gradient(ellipse 360px 280px at 89% 10%, rgba(0, 0, 0, 0.86) 0%, rgba(0, 0, 0, 0.72) 28%, rgba(0, 0, 0, 0.24) 56%, transparent 80%);
}

.ambient-grid-pointer {
  background-image: radial-gradient(circle, rgba(116, 128, 176, 0.56) 0 0.94px, transparent 1.28px);
  opacity: calc(var(--pointer-active) * 0.28);
  filter: blur(0);
  -webkit-mask-image: radial-gradient(238px 238px at var(--pointer-x) var(--pointer-y), rgba(0, 0, 0, 0.96) 0%, rgba(0, 0, 0, 0.78) 34%, rgba(0, 0, 0, 0.42) 56%, transparent 78%);
  mask-image: radial-gradient(238px 238px at var(--pointer-x) var(--pointer-y), rgba(0, 0, 0, 0.96) 0%, rgba(0, 0, 0, 0.78) 34%, rgba(0, 0, 0, 0.42) 56%, transparent 78%);
  transition: opacity 0.18s ease;
}

.ambient-grid-glow {
  background:
    radial-gradient(280px 280px at var(--pointer-x) var(--pointer-y), rgb(92 118 232 / calc(0.022 * var(--pointer-active))) 0%, rgb(92 118 232 / calc(0.008 * var(--pointer-active))) 44%, transparent 76%),
    radial-gradient(520px 520px at var(--pointer-x) var(--pointer-y), rgb(92 118 232 / calc(0.01 * var(--pointer-active))) 0%, transparent 76%),
    radial-gradient(320px 240px at 12% 8%, rgb(92 118 232 / 0.008) 0%, transparent 78%),
    radial-gradient(360px 260px at 88% 10%, rgb(92 118 232 / 0.008) 0%, transparent 80%);
}

button,
input,
select,
textarea {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

#app {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0 132px;
}

body.is-ielts-exam-view {
  position: fixed;
  inset: 0;
  width: 100%;
  overscroll-behavior: none;
}

body.is-ielts-exam-view .page-shell {
  height: 100svh;
  min-height: 100svh;
}

body.is-ielts-exam-view #app {
  height: 100svh;
  width: 100%;
  margin: 0;
  padding: 0;
}

.screen {
  animation: fade-rise 0.45s ease both;
}

.topbar-shell {
  width: 100vw;
  margin: -24px 0 28px calc(50% - 50vw);
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid rgba(33, 42, 57, 0.08);
  box-shadow: 0 6px 18px rgba(33, 42, 57, 0.04);
}

.topbar {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 88px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}

.topbar-brand {
  justify-self: start;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  color: var(--brand-indigo);
  font-size: clamp(1.35rem, 1.7vw, 1.7rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: center;
  gap: 14px;
  flex-wrap: wrap;
}

.topnav-link {
  padding: 10px 14px;
  border: none;
  background: transparent;
  color: #435063;
  font-size: 1rem;
  cursor: pointer;
  transition: color 0.18s ease;
}

.topnav-link:hover,
.topnav-link:focus-visible {
  outline: none;
  color: #111827;
}

.topnav-button {
  font: inherit;
}

.topbar-telegram {
  justify-self: end;
  min-height: 48px;
  min-width: 196px;
  padding: 0 22px;
  border-radius: 14px;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.98rem;
  font-weight: 700;
  box-shadow: 0 14px 28px rgba(45, 39, 115, 0.22);
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
  overflow: hidden;
}

.topbar-telegram:hover,
.topbar-telegram:focus-visible {
  outline: none;
  transform: translateY(-1px);
  box-shadow: 0 18px 32px rgba(45, 39, 115, 0.28);
  filter: saturate(1.03);
}

.topbar-telegram-copy {
  position: relative;
  display: block;
  width: 154px;
  height: 1.25em;
}

.topbar-telegram-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  transition: opacity 0.24s ease, transform 0.24s ease;
}

.topbar-telegram-text-join {
  animation: telegram-label-join 2.9s ease-in-out infinite;
}

.topbar-telegram-text-channel {
  animation: telegram-label-channel 2.9s ease-in-out infinite;
  opacity: 0;
  transform: translateY(12px);
}

@keyframes telegram-label-join {
  0%,
  38% {
    opacity: 1;
    transform: translateY(0);
  }

  48%,
  100% {
    opacity: 0;
    transform: translateY(-12px);
  }
}

@keyframes telegram-label-channel {
  0%,
  42% {
    opacity: 0;
    transform: translateY(12px);
  }

  52%,
  90% {
    opacity: 1;
    transform: translateY(0);
  }

  100% {
    opacity: 0;
    transform: translateY(-12px);
  }
}

.dashboard-hero {
  display: grid;
  justify-items: center;
  gap: 14px;
  text-align: center;
  padding: 16px 0 24px;
}

.hero-avatar {
  width: 72px;
  height: 72px;
  font-size: 1.35rem;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.08;
}

.hero-copy p {
  margin: 7px 0 0;
  color: var(--muted);
}

.hero-note {
  font-size: 0.92rem;
}

.dashboard-screen {
  position: relative;
}

.dashboard-section {
  margin-top: 18px;
  padding: 12px 0;
}

.dashboard-section-head {
  margin-bottom: 18px;
  text-align: center;
}

.dashboard-section-head h2 {
  margin: 0 0 8px;
  color: #202938;
  font-size: 2rem;
}

.dashboard-section-head p {
  margin: 0;
  color: #7b8591;
  line-height: 1.6;
}

.dashboard-card {
  padding: 18px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 18px 34px rgba(17, 55, 27, 0.05);
}

.dashboard-card-head h2 {
  margin: 0;
  font-size: 1.35rem;
}

.dashboard-card-head p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.tool-card {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  display: grid;
  justify-items: center;
  gap: 12px;
  text-align: center;
}

.tool-icon,
.skill-icon {
  display: grid;
  place-items: center;
  color: #fff;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    0 12px 26px rgba(22, 31, 56, 0.1);
}

.tool-icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
}

.tool-icon svg,
.skill-icon svg {
  width: 20px;
  height: 20px;
}

.tool-card strong {
  font-size: 0.96rem;
}

.home-tool-grid .tool-card,
.home-skill-grid .skill-card {
  border-color: #e3e7ef;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: none;
}

.home-tool-grid .tool-card {
  padding: 22px 18px;
}

.home-skill-grid .skill-card {
  padding: 28px 22px;
}

.tool-blue {
  background: #edf8ff;
  border-color: #cae7ff;
}

.tool-blue .tool-icon {
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
}

.tool-green {
  background: #eefaf2;
  border-color: #ccecd7;
}

.tool-green .tool-icon {
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
}

.tool-violet {
  background: #f4efff;
  border-color: #dfd3ff;
}

.tool-violet .tool-icon {
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
}

.tool-pink {
  background: #fff0f4;
  border-color: #ffd6e3;
}

.tool-pink .tool-icon {
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.skill-card {
  padding: 24px 20px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  display: grid;
  justify-items: center;
  gap: 12px;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 16px 32px rgba(14, 41, 19, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.skill-card:hover,
.skill-card:focus-visible {
  outline: none;
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(14, 41, 19, 0.08);
}

.skill-icon {
  width: 48px;
  height: 48px;
  border-radius: 16px;
}

.skill-card strong {
  font-size: 1.15rem;
  letter-spacing: 0.03em;
}

.skill-card span {
  font-size: 0.88rem;
  color: var(--muted);
}

.skill-blue {
  border-color: #c2dcff;
}

.skill-blue .skill-icon {
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
}

.skill-blue strong {
  color: #111111;
}

.skill-green {
  border-color: #bbecca;
}

.skill-green .skill-icon {
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
}

.skill-green strong {
  color: #111111;
}

.tool-card-button {
  cursor: pointer;
  text-align: center;
  font: inherit;
}

.tool-card-button:hover,
.tool-card-button:focus-visible,
.flash-topic-card:hover,
.flash-topic-card:focus-visible,
.flash-utility:hover,
.flash-utility:focus-visible,
.article-preview-card:hover,
.article-preview-card:focus-visible,
.flash-nav-button:hover,
.flash-nav-button:focus-visible,
.flash-dot:hover,
.flash-dot:focus-visible {
  outline: none;
  transform: translateY(-2px);
}

.flashcards-hero {
  text-align: center;
  padding: 10px 0 24px;
}

.flashcards-hero h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 4vw, 3rem);
}

.flashcards-hero p {
  margin: 0;
  color: var(--muted);
}

.flash-topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.flash-topic-card {
  position: relative;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  text-align: left;
  display: grid;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 18px 30px rgba(15, 36, 18, 0.06);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  animation: fade-rise 0.45s ease both;
}

.flash-topic-card:hover,
.flash-topic-card:focus-visible {
  border-color: var(--topic-accent);
  box-shadow: 0 22px 38px rgba(15, 36, 18, 0.1);
}

.flash-topic-stripe {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  border-radius: 20px 20px 0 0;
  background: var(--topic-accent);
}

.flash-topic-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--topic-accent);
  margin-top: 2px;
}

.flash-topic-icon svg,
.flash-utility svg,
.flash-nav-button svg {
  width: 17px;
  height: 17px;
}

.flash-topic-card strong {
  font-size: 1.05rem;
  margin-top: 4px;
}

.flash-topic-card small {
  color: var(--muted);
  font-size: 0.8rem;
}

.flash-topic-card p {
  margin: 4px 0 0;
  color: #526059;
  line-height: 1.55;
  min-height: 48px;
}

.flash-topic-link {
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.9rem;
}

.flash-topic-link svg {
  width: 15px;
  height: 15px;
}

.flash-study-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.flash-study-copy {
  text-align: center;
}

.flash-study-copy h1 {
  margin: 0 0 8px;
  font-size: 2.1rem;
}

.flash-study-copy p {
  margin: 0;
  color: var(--muted);
}

.flash-study-actions {
  display: flex;
}

.flash-utility {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
  box-shadow: 0 10px 20px rgba(17, 55, 27, 0.04);
}

.flash-progress-block {
  width: min(760px, 100%);
  margin: 0 auto 20px;
}

.flash-progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.86rem;
}

.flash-progress-line {
  height: 5px;
  border-radius: 999px;
  background: #e7edf1;
  overflow: hidden;
}

.flash-progress-line span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--topic-accent) 0%, #241d61 100%);
  transition: width 0.4s ease;
}

.flash-study-stage {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.flash-card-trigger {
  width: min(700px, 100%);
  border: none;
  background: transparent;
  padding: 8px 0;
  cursor: pointer;
  perspective: 1800px;
  transform-style: preserve-3d;
}

.flash-card-3d {
  position: relative;
  display: block;
  width: 100%;
  height: 360px;
  transform-origin: center center;
  transform-style: preserve-3d;
  transition: transform 0.82s cubic-bezier(0.22, 0.72, 0.16, 1);
  will-change: transform;
}

.flash-card-3d.is-flipped {
  transform: rotateY(180deg);
}

.flash-card-face {
  position: absolute;
  inset: 0;
  border-radius: 28px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
  box-shadow: 0 26px 48px rgba(45, 34, 92, 0.14);
  transform-style: preserve-3d;
}

.flash-card-front {
  display: grid;
  place-content: center;
  gap: 16px;
  padding: 34px;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, var(--card-a) 0%, var(--card-b) 100%);
}

.flash-card-label {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  opacity: 0.85;
}

.flash-card-front strong {
  font-size: clamp(2.5rem, 6vw, 4.1rem);
  line-height: 1.05;
}

.flash-card-front small,
.flash-card-back-copy small {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.86);
}

.flash-card-back {
  transform: rotateY(180deg);
  background: #fff;
  padding: 26px;
}

.flash-card-back-copy {
  width: 100%;
  height: 100%;
  display: grid;
  gap: 14px;
  align-content: start;
  text-align: left;
}

.flash-card-back-copy h2 {
  margin: 0;
  font-size: 2rem;
}

.flash-card-detail span,
.flash-card-example span {
  display: block;
  margin-bottom: 6px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--topic-accent);
}

.flash-card-detail p,
.flash-card-example p {
  margin: 0;
  line-height: 1.65;
  color: #32403a;
}

.flash-card-example {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--topic-soft);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.flash-card-back-copy small {
  margin-top: auto;
  text-align: center;
  color: var(--muted);
}

.flash-study-controls {
  width: min(760px, 100%);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
}

.flash-nav-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease, opacity 0.22s ease;
  box-shadow: 0 12px 20px rgba(17, 55, 27, 0.05);
}

.flash-nav-next {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--topic-accent) 0%, #241d61 100%);
}

.flash-nav-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.flash-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.flash-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: #d7dde5;
  cursor: pointer;
  transition: transform 0.2s ease, width 0.2s ease, background 0.2s ease;
}

.flash-dot.active {
  width: 24px;
  background: var(--topic-accent);
}

.flash-study-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

.articles-hero,
.article-detail-hero {
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
}

.articles-hero {
  margin-bottom: 30px;
  padding: 56px 0;
  background:
    radial-gradient(circle at 18% 24%, rgba(255, 255, 255, 0.12), transparent 28%),
    radial-gradient(circle at 82% 38%, rgba(255, 255, 255, 0.08), transparent 24%),
    linear-gradient(135deg, #5a2bff 0%, #8f34ff 100%);
}

.articles-hero-inner,
.article-detail-hero-inner {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.articles-hero h1 {
  margin: 0 0 16px;
  max-width: 640px;
  color: #fff;
  font-size: clamp(2.4rem, 4.4vw, 4rem);
  line-height: 1.02;
}

.articles-hero p {
  margin: 0;
  max-width: 620px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.08rem;
  line-height: 1.7;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.article-preview-card {
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  appearance: none;
  text-align: left;
  color: var(--text);
  cursor: pointer;
  overflow: hidden;
  box-shadow: 0 18px 34px rgba(18, 35, 55, 0.08);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  animation: fade-rise 0.48s ease both;
}

.article-preview-card:hover,
.article-preview-card:focus-visible {
  border-color: rgba(86, 53, 255, 0.28);
  box-shadow: 0 24px 44px rgba(18, 35, 55, 0.13);
}

.article-preview-media,
.article-detail-hero {
  position: relative;
  overflow: hidden;
}

.article-preview-media {
  display: block;
  min-height: 168px;
  background:
    radial-gradient(circle at 22% 18%, rgba(255, 255, 255, 0.28), transparent 18%),
    radial-gradient(circle at 78% 78%, rgba(255, 255, 255, 0.18), transparent 16%),
    linear-gradient(135deg, var(--cover-a) 0%, var(--cover-b) 100%);
}

.article-preview-media::before,
.article-detail-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 12, 23, 0.1) 0%, rgba(8, 12, 23, 0.44) 100%),
    linear-gradient(120deg, transparent 22%, rgba(255, 255, 255, 0.12) 38%, transparent 54%);
}

.article-preview-media::after,
.article-detail-hero::after {
  content: "";
  position: absolute;
  inset: auto -8% -28% 42%;
  height: 78%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12), transparent 66%);
  transform: rotate(-10deg);
}

.article-category-badge,
.article-hero-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.article-category-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(255, 255, 255, 0.94);
  color: #5d32ff;
  box-shadow: 0 10px 20px rgba(18, 35, 55, 0.14);
}

.article-preview-body {
  display: grid;
  gap: 12px;
  padding: 18px 18px 20px;
}

.article-preview-body strong {
  display: block;
  font-size: 1.28rem;
  line-height: 1.22;
}

.article-preview-body p {
  margin: 0;
  color: #59656d;
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-preview-meta,
.article-detail-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.84rem;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-meta-item svg,
.article-mini-icon svg {
  width: 14px;
  height: 14px;
}

.article-preview-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #5d32ff;
  font-size: 0.92rem;
  font-weight: 700;
}

.article-preview-link svg {
  width: 15px;
  height: 15px;
}

.article-detail-hero {
  min-height: 330px;
  margin-top: -10px;
  background:
    radial-gradient(circle at 14% 22%, rgba(255, 255, 255, 0.12), transparent 22%),
    radial-gradient(circle at 80% 32%, rgba(255, 255, 255, 0.08), transparent 24%),
    linear-gradient(135deg, var(--cover-a) 0%, var(--cover-b) 100%);
}

.article-detail-hero-inner {
  min-height: 330px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 16px 0 22px;
}

.hero-back-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 11px 16px;
  border: 1px solid rgba(255, 255, 255, 0.68);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 14px 28px rgba(18, 35, 55, 0.12);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.hero-back-button:hover,
.hero-back-button:focus-visible {
  outline: none;
  transform: translateY(-2px);
  box-shadow: 0 18px 32px rgba(18, 35, 55, 0.15);
}

.hero-back-button svg {
  width: 15px;
  height: 15px;
}

.article-hero-badge {
  align-self: flex-start;
  background: rgba(96, 56, 255, 0.92);
  color: #fff;
  box-shadow: 0 12px 24px rgba(44, 18, 130, 0.22);
}

.article-detail-shell {
  position: relative;
  z-index: 2;
  width: min(860px, calc(100% - 40px));
  margin: -74px auto 0;
}

.article-detail-card {
  padding: 32px 34px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 28px 58px rgba(18, 35, 55, 0.12);
}

.article-detail-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.article-detail-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  line-height: 1.02;
}

.article-detail-tools {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #818895;
}

.article-mini-icon {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: inline-grid;
  place-items: center;
  background: #fff;
}

.article-detail-intro {
  margin: 22px 0 0;
  color: #51616a;
  font-size: 1.08rem;
  line-height: 1.85;
}

.article-content {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.article-section {
  display: grid;
  gap: 12px;
}

.article-section h2 {
  margin: 0;
  font-size: 1.48rem;
}

.article-section p {
  margin: 0;
  color: #44545b;
  font-size: 1.02rem;
  line-height: 1.9;
}

.grammar-hero {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding: 8px 0 26px;
}

.grammar-hero-copy h1 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
}

.grammar-hero-copy p {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  line-height: 1.75;
}

.grammar-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 16px;
  border: 1px solid rgba(45, 39, 115, 0.18);
  background: rgba(45, 39, 115, 0.06);
  color: var(--brand-indigo);
  font-weight: 700;
  box-shadow: 0 14px 24px rgba(45, 39, 115, 0.08);
}

.grammar-hero-badge svg,
.grammar-card-play svg,
.grammar-detail-link svg,
.grammar-detail-lock svg {
  width: 16px;
  height: 16px;
}

.grammar-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.grammar-card {
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  appearance: none;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
  color: var(--text);
  box-shadow: 0 18px 34px rgba(18, 35, 55, 0.08);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  animation: fade-rise 0.48s ease both;
}

.grammar-card:hover,
.grammar-card:focus-visible,
.grammar-detail-link:hover,
.grammar-detail-link:focus-visible {
  outline: none;
  transform: translateY(-2px);
}

.grammar-card:hover,
.grammar-card:focus-visible {
  border-color: rgba(45, 39, 115, 0.28);
  box-shadow: 0 24px 44px rgba(18, 35, 55, 0.13);
}

.grammar-card-media {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  min-height: 200px;
  padding: 18px;
  background:
    radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.18), transparent 22%),
    radial-gradient(circle at 74% 76%, rgba(255, 255, 255, 0.12), transparent 18%),
    linear-gradient(135deg, var(--grammar-accent) 0%, #23143b 100%);
}

.grammar-card-media::after {
  content: "";
  position: absolute;
  inset: auto -6% -24% 48%;
  height: 84%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.14), transparent 68%);
  transform: rotate(-14deg);
}

.grammar-card-play,
.grammar-card-series {
  position: relative;
  z-index: 1;
}

.grammar-card-play {
  width: 50px;
  height: 50px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(12px);
}

.grammar-card-series {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--brand-indigo);
  font-size: 0.82rem;
  font-weight: 700;
}

.grammar-card-body {
  display: grid;
  gap: 10px;
  padding: 20px;
}

.grammar-card-body small {
  color: #7b8490;
  font-size: 0.82rem;
}

.grammar-card-body strong {
  font-size: 1.3rem;
  line-height: 1.24;
}

.grammar-card-body p {
  margin: 0;
  color: #57646c;
  line-height: 1.7;
}

.grammar-card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-indigo);
  font-size: 0.92rem;
  font-weight: 700;
}

.grammar-card-link svg {
  width: 15px;
  height: 15px;
}

.grammar-detail-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.grammar-detail-series {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(45, 39, 115, 0.06);
  color: var(--brand-indigo);
  font-size: 0.82rem;
  font-weight: 700;
}

.grammar-detail-copy h1 {
  margin: 12px 0 10px;
  font-size: clamp(2.1rem, 4vw, 3.2rem);
}

.grammar-detail-copy p {
  margin: 0;
  max-width: 700px;
  color: var(--muted);
  line-height: 1.75;
}

.grammar-detail-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  border-radius: 16px;
  border: 1px solid rgba(45, 39, 115, 0.18);
  background: #fff;
  color: var(--brand-indigo);
  font-weight: 700;
  box-shadow: 0 12px 24px rgba(45, 39, 115, 0.08);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.grammar-detail-lock {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  border-radius: 16px;
  border: 1px solid rgba(45, 39, 115, 0.18);
  background: rgba(45, 39, 115, 0.06);
  color: var(--brand-indigo);
  font-weight: 700;
  box-shadow: 0 12px 24px rgba(45, 39, 115, 0.08);
}

.grammar-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: 20px;
  align-items: start;
}

.grammar-video-panel,
.grammar-notes-panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 18px 34px rgba(18, 35, 55, 0.08);
}

.grammar-video-panel {
  padding: 18px;
}

.grammar-video-frame {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  border-radius: 20px;
  background: linear-gradient(135deg, #241d61 0%, var(--brand-indigo) 100%);
  isolation: isolate;
}

.grammar-video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  z-index: 1;
}

.grammar-video-watermark,
.grammar-video-shield {
  position: absolute;
  z-index: 3;
  pointer-events: none;
}

.grammar-video-watermark {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(10, 10, 18, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  backdrop-filter: blur(6px);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

.grammar-video-watermark-top {
  top: 14px;
  left: 14px;
}

.grammar-video-watermark-bottom {
  right: 14px;
  bottom: 14px;
}

.grammar-video-shield {
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  justify-items: center;
  background:
    linear-gradient(180deg, rgba(7, 10, 20, 0.2) 0%, rgba(7, 10, 20, 0.54) 100%),
    radial-gradient(circle at center, rgba(45, 39, 115, 0.24), transparent 54%);
  color: #fff;
  opacity: 0;
  transition: opacity 0.2s ease;
  backdrop-filter: blur(10px);
}

.grammar-video-shield.is-active {
  opacity: 1;
}

.grammar-video-shield-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.grammar-video-shield-icon svg {
  width: 18px;
  height: 18px;
}

.grammar-video-shield strong {
  font-size: 1.08rem;
  letter-spacing: 0.04em;
}

.grammar-notes-panel {
  display: grid;
  gap: 16px;
  padding: 20px;
}

.grammar-note-block {
  display: grid;
  gap: 10px;
  padding: 18px;
  border-radius: 18px;
  background: #fafaff;
  border: 1px solid rgba(45, 39, 115, 0.12);
}

.grammar-note-label {
  color: var(--brand-indigo);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.grammar-note-block strong {
  font-size: 1.08rem;
}

.grammar-note-block p {
  margin: 0;
  color: #59656d;
  line-height: 1.7;
}

.grammar-objective-list {
  margin: 0;
  padding-left: 18px;
  color: #415059;
  line-height: 1.75;
}

.grammar-objective-list li + li {
  margin-top: 10px;
}

body.protected-lesson-mode {
  -webkit-touch-callout: none;
}

body.protected-lesson-mode .grammar-detail-screen,
body.protected-lesson-mode .grammar-detail-screen * {
  -webkit-user-select: none;
  user-select: none;
}

.security-toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 200;
  max-width: min(360px, calc(100vw - 36px));
  padding: 12px 16px;
  border-radius: 14px;
  background: rgba(18, 24, 32, 0.92);
  color: #fff;
  font-size: 0.9rem;
  line-height: 1.5;
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.22);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  pointer-events: none;
}

.security-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.highlight-toolbar {
  position: fixed;
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 20px;
  padding: 6px 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 9999;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  font-size: 13px;
  color: #333;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  cursor: pointer;
  white-space: nowrap;
}

.highlight-toolbar.is-visible {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.highlight-toolbar-button {
  border: none;
  background: transparent;
  color: #333;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0;
  font-size: 13px;
  cursor: pointer;
}

.highlight-toolbar-button:hover,
.highlight-toolbar-button:focus-visible {
  outline: none;
  color: #111;
}

.highlight-toolbar-icon {
  font-size: 14px;
  line-height: 1;
}

.highlight-edit-toolbar {
  position: fixed;
  background: white;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 6px 0;
  display: flex;
  align-items: center;
  font-size: 13px;
  color: #333;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  z-index: 9999;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.highlight-edit-toolbar.is-visible {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.toolbar-btn {
  border: none;
  background: transparent;
  padding: 4px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #333;
  font-size: 13px;
}

.toolbar-btn:hover,
.toolbar-btn:focus-visible {
  outline: none;
  color: #111;
}

.toolbar-divider {
  width: 1px;
  height: 20px;
  background: #e0e0e0;
}

.join-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 180;
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.08), transparent 24%),
    linear-gradient(180deg, rgba(77, 9, 9, 0.76) 0%, rgba(48, 7, 7, 0.7) 100%);
  backdrop-filter: blur(14px);
}

.join-modal-card {
  position: relative;
  width: min(440px, 100%);
  padding: 34px 24px 24px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.98);
  border-top: 4px solid #35c8d6;
  box-shadow: 0 28px 60px rgba(16, 20, 36, 0.28);
  text-align: center;
}

.join-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 50%;
  background: #f3f3f5;
  color: #8a8d96;
  display: grid;
  place-items: center;
  cursor: pointer;
}

.join-modal-close svg {
  width: 16px;
  height: 16px;
}

.join-modal-badge {
  width: 74px;
  height: 74px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  box-shadow: 0 18px 34px rgba(45, 39, 115, 0.28);
}

.join-modal-card h2 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.05;
}

.join-modal-card h3 {
  margin: 0 0 16px;
  color: var(--brand-indigo);
  font-size: 1.28rem;
}

.join-modal-card p {
  margin: 0 0 24px;
  color: #6a7381;
  line-height: 1.8;
  font-size: 1rem;
}

.join-modal-primary,
.join-modal-secondary,
.support-copy-button,
.support-send-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  min-height: 54px;
  border-radius: 16px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.join-modal-primary {
  padding: 0 18px;
  border: none;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  color: #fff;
  box-shadow: 0 18px 34px rgba(45, 39, 115, 0.28);
  justify-content: flex-start;
}

.join-modal-primary-icon {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
  display: inline-grid;
  place-items: center;
  overflow: hidden;
}

.join-modal-primary-icon svg {
  width: 18px;
  height: 18px;
  display: block;
}

.join-modal-primary-copy {
  flex: 1 1 auto;
  text-align: center;
}

.join-modal-secondary {
  margin-top: 14px;
  border: none;
  background: #f3f4f7;
  color: #444d5d;
  cursor: pointer;
}

.join-modal-primary:hover,
.join-modal-primary:focus-visible,
.join-modal-secondary:hover,
.join-modal-secondary:focus-visible,
.support-fab:hover,
.support-fab:focus-visible,
.support-copy-button:hover,
.support-copy-button:focus-visible,
.support-send-button:hover,
.support-send-button:focus-visible,
.join-modal-close:hover,
.join-modal-close:focus-visible {
  outline: none;
  transform: translateY(-2px);
}

.support-fab {
  position: fixed;
  left: 0;
  bottom: 18px;
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 12px 18px 12px 16px;
  border: 1px solid #e2dafd;
  border-left: none;
  border-radius: 0 16px 16px 0;
  background: #f4efff;
  color: #49566b;
  box-shadow: 0 14px 26px rgba(32, 34, 68, 0.12);
  cursor: pointer;
}

.support-fab svg {
  width: 16px;
  height: 16px;
}

.support-shell {
  display: flex;
  justify-content: center;
  padding: 18px 0 0;
}

.support-card {
  width: min(560px, 100%);
  padding: 34px 28px;
  border-radius: 28px;
  border: 1px solid rgba(45, 39, 115, 0.14);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.72), transparent 32%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(253, 250, 255, 0.96) 100%);
  box-shadow: 0 28px 60px rgba(45, 39, 115, 0.1);
}

.support-heart {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--brand-indigo);
  background: rgba(45, 39, 115, 0.08);
}

.support-heart svg {
  width: 24px;
  height: 24px;
}

.support-card h1,
.support-message-panel h2 {
  margin: 0;
  text-align: center;
}

.support-card h1 {
  font-size: clamp(2rem, 4vw, 2.7rem);
}

.support-intro {
  margin: 12px auto 0;
  max-width: 430px;
  text-align: center;
  color: #697483;
  line-height: 1.75;
}

.support-bank-panel {
  margin-top: 24px;
  padding: 20px;
  border-radius: 22px;
  border: 1px solid #d8e6ff;
  background: linear-gradient(180deg, #eef5ff 0%, #e6f0ff 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.45);
}

.support-section-label {
  display: block;
  margin-bottom: 12px;
  text-align: center;
  color: var(--brand-indigo);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.support-card-number {
  padding: 16px 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.88);
  text-align: center;
  font-family: "Courier New", monospace;
  font-size: clamp(1.15rem, 3vw, 1.45rem);
  letter-spacing: 0.14em;
  color: #4b5664;
  box-shadow: 0 10px 18px rgba(86, 104, 142, 0.08);
}

.support-bank-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
  margin-bottom: 14px;
}

.support-bank-meta small {
  display: block;
  margin-bottom: 6px;
  color: #7e8a98;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.support-bank-meta strong {
  font-size: 0.95rem;
}

.support-copy-button {
  border: none;
  background: linear-gradient(135deg, rgba(45, 39, 115, 0.08) 0%, rgba(45, 39, 115, 0.14) 100%);
  color: var(--brand-indigo);
  cursor: pointer;
}

.support-copy-button svg,
.support-send-button svg,
.support-note svg {
  width: 15px;
  height: 15px;
}

.support-message-panel {
  display: grid;
  gap: 14px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid rgba(45, 39, 115, 0.12);
}

.support-success {
  padding: 14px 16px;
  border-radius: 16px;
  background: #eefaf2;
  border: 1px solid #ccecd7;
  color: #0a8d4a;
  line-height: 1.6;
}

.support-field {
  display: grid;
  gap: 8px;
}

.support-field span {
  font-size: 0.9rem;
  font-weight: 700;
  color: #3b4657;
}

.support-field input,
.support-field textarea {
  width: 100%;
  padding: 14px 15px;
  border: 1px solid #d7dfeb;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  resize: vertical;
}

.support-field input:focus,
.support-field textarea:focus {
  outline: none;
  border-color: rgba(45, 39, 115, 0.42);
  box-shadow: 0 0 0 4px rgba(45, 39, 115, 0.1);
}

.support-send-button {
  border: none;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 16px 30px rgba(45, 39, 115, 0.22);
}

.support-note {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 0;
  color: #6a7484;
  font-size: 0.88rem;
  line-height: 1.6;
  text-align: center;
}

.site-footer {
  width: 100vw;
  margin: 54px 0 0 calc(50% - 50vw);
  background: #232d3b;
  color: #edf1f8;
}

.site-footer-inner,
.site-footer-bottom {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr 0.7fr;
  gap: 40px;
  padding: 62px 0 36px;
}

.site-footer-brand strong {
  display: inline-block;
  color: #fff;
  font-size: 1.9rem;
  letter-spacing: 0.03em;
}

.site-footer-brand p {
  margin: 18px 0 0;
  max-width: 520px;
  color: rgba(237, 241, 248, 0.7);
  line-height: 1.65;
  font-size: 1rem;
}

.site-footer-column h3 {
  margin: 0 0 18px;
  color: #fff;
  font-size: 1.1rem;
}

.site-footer-column a,
.footer-link-button {
  display: block;
  margin-top: 12px;
  padding: 0;
  border: none;
  background: transparent;
  color: rgba(237, 241, 248, 0.68);
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.site-footer-column a:hover,
.site-footer-column a:focus-visible,
.footer-link-button:hover,
.footer-link-button:focus-visible {
  outline: none;
  color: #fff;
}

.site-footer-bottom {
  padding: 22px 0 44px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(237, 241, 248, 0.62);
  text-align: center;
}

.page-divider {
  border-top: 1px solid var(--line);
  margin: 0 -40px 24px;
}

.crumb-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--muted);
  padding: 4px 0 16px;
}

.crumb-link svg {
  width: 15px;
  height: 15px;
}

.subject-hero {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 0 28px;
}

.subject-icon,
.intro-number,
.part-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.subject-icon {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  color: #fff;
  box-shadow: 0 12px 22px rgba(45, 39, 115, 0.22);
}

.subject-icon svg,
.part-badge svg {
  width: 19px;
  height: 19px;
}

.subject-copy h1 {
  margin: 0;
  font-size: 2rem;
}

.subject-copy p {
  margin: 4px 0 0;
  color: var(--muted);
}

.section-head {
  padding: 22px 0 18px;
  border-top: 1px solid var(--line);
}

.section-head h2 {
  margin: 0 0 8px;
  font-size: 1.85rem;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.reading-path-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.reading-path-card {
  position: relative;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  text-align: left;
  cursor: pointer;
  color: var(--text);
  box-shadow: 0 18px 34px rgba(18, 35, 55, 0.08);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.reading-path-card:hover,
.reading-path-card:focus-visible {
  outline: none;
  transform: translateY(-2px);
  border-color: #b9d8c4;
  box-shadow: 0 24px 42px rgba(18, 35, 55, 0.12);
}

.reading-path-card.is-ielts {
  background: linear-gradient(180deg, rgba(246, 249, 255, 0.96) 0%, rgba(255, 255, 255, 0.92) 100%);
}

.reading-path-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(45, 39, 115, 0.08);
  color: var(--brand-indigo);
  font-size: 0.8rem;
  font-weight: 700;
}

.reading-path-card h2 {
  margin: 18px 0 10px;
  font-size: 1.75rem;
}

.reading-path-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.reading-path-link {
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
}

.reading-path-link svg {
  width: 15px;
  height: 15px;
}

.library-note {
  margin: 0 0 18px;
  padding: 14px 16px;
  border: 1px solid #cbe4ff;
  border-radius: 16px;
  color: #5f6e7a;
  background: #f2f9ff;
}

.test-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.test-card {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 16px 16px;
  box-shadow: 0 16px 32px rgba(14, 41, 19, 0.04);
  animation: fade-rise 0.55s ease both;
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.card-head h3 {
  margin: 0;
  font-size: 1.35rem;
}

.test-card-meta {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.5;
}

.test-index-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 10px;
  background: #f0f0f0;
  color: #555;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}

.count-pill,
.detail-pill,
.timer-pill,
.mode-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 28px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.count-pill,
.detail-pill {
  color: var(--brand-indigo);
  background: rgba(45, 39, 115, 0.08);
  border: 1px solid rgba(45, 39, 115, 0.2);
}

.mode-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.mode-label {
  font-size: 0.84rem;
  color: var(--muted);
}

.pill-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.mode-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  padding: 5px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.mode-pill:hover,
.mode-pill:focus-visible,
.start-button:hover,
.start-button:focus-visible,
.ghost-button:hover,
.ghost-button:focus-visible,
.primary-button:hover,
.primary-button:focus-visible,
.part-tab:hover,
.part-tab:focus-visible,
.select-field:hover,
.select-field:focus-visible,
.blank-input:hover,
.blank-input:focus-visible {
  outline: none;
  transform: translateY(-1px);
}

.mode-pill.active {
  color: #fff;
  background: linear-gradient(135deg, #ff5b63 0%, #e2344a 100%);
  border-color: transparent;
  box-shadow: 0 10px 16px rgba(226, 52, 74, 0.24);
}

.start-button,
.ghost-button,
.primary-button {
  border-radius: var(--radius-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}

.start-button {
  width: 100%;
  border: 1px solid rgba(45, 39, 115, 0.2);
  background: rgba(45, 39, 115, 0.08);
  color: var(--brand-indigo);
  padding: 13px 14px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.start-button svg {
  width: 15px;
  height: 15px;
}

.start-button.is-disabled,
.start-button:disabled {
  cursor: not-allowed;
  color: #86928a;
  background: #f6f8f6;
  border-color: var(--line);
  box-shadow: none;
}

.start-button.is-disabled:hover,
.start-button.is-disabled:focus-visible,
.start-button:disabled:hover,
.start-button:disabled:focus-visible {
  transform: none;
}

.test-header {
  display: grid;
  gap: 18px;
  padding-bottom: 20px;
}

.test-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.test-centerline {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 0.95rem;
  flex-wrap: wrap;
}

.test-centerline svg {
  width: 16px;
  height: 16px;
  color: var(--brand-indigo);
}

.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.timer-pill {
  color: #7a4300;
  border: 1px solid #ffd39d;
  background: var(--orange-soft);
}

.timer-pill.live {
  color: #fff;
  background: linear-gradient(135deg, #ff9300 0%, #ff5d00 100%);
  border-color: transparent;
  box-shadow: 0 14px 24px rgba(255, 120, 0, 0.24);
}

.mode-status {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
}

.part-section {
  scroll-margin-top: 26px;
  margin-bottom: 22px;
}

.intro-card,
.content-card,
.review-card {
  border-radius: var(--radius-md);
  border: 1px solid rgba(45, 39, 115, 0.18);
  background: linear-gradient(180deg, rgba(244, 243, 255, 0.95) 0%, rgba(255, 255, 255, 0.98) 100%);
  box-shadow: 0 18px 34px rgba(45, 39, 115, 0.04);
}

.intro-card {
  padding: 16px 18px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.intro-number {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
}

.intro-copy h3 {
  margin: 0 0 6px;
  font-size: 1.5rem;
}

.intro-copy p {
  margin: 0;
  color: var(--muted);
  font-style: italic;
  line-height: 1.6;
}

.content-card {
  background: rgba(255, 255, 255, 0.95);
  border-color: var(--line);
  padding: 20px;
  margin-top: 16px;
}

.center-title {
  margin: 0 0 18px;
  text-align: center;
  color: var(--brand-indigo);
  font-size: 1.55rem;
}

.passage {
  font-family: var(--font-reading);
  line-height: 1.95;
  font-size: 1.03rem;
  color: #203023;
}

.passage p {
  margin: 0 0 14px;
}

.inline-blank,
.line-blank {
  display: inline-grid;
  gap: 4px;
  vertical-align: middle;
}

.inline-blank small,
.line-blank small {
  font-family: var(--font-ui);
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

.blank-input {
  border: none;
  border-bottom: 2px solid var(--brand-indigo);
  background: transparent;
  padding: 4px 2px 6px;
  color: var(--brand-indigo);
  font-weight: 700;
  text-align: center;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.blank-input::placeholder {
  color: rgba(45, 39, 115, 0.32);
}

.blank-input.short {
  width: 88px;
}

.blank-input.medium {
  width: 116px;
}

.blank-input.long {
  width: 148px;
}

.statement-panel {
  background: rgba(45, 39, 115, 0.05);
  border: 1px solid rgba(45, 39, 115, 0.16);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 20px;
}

.statement-panel h4,
.heading-panel h4 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

.letter-list,
.heading-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.letter-list li,
.heading-list li {
  display: flex;
  gap: 10px;
  line-height: 1.55;
}

.letter-key {
  min-width: 22px;
  font-weight: 700;
}

.ad-list,
.paragraph-list {
  display: grid;
  gap: 14px;
}

.ad-card,
.paragraph-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.ad-card.highlight {
  border-color: rgba(45, 39, 115, 0.2);
  box-shadow: 0 12px 28px rgba(45, 39, 115, 0.08);
}

.ad-card h5,
.paragraph-card h5 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.ad-card p,
.paragraph-card p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.65;
}

.select-field {
  min-width: 160px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.heading-panel {
  background: rgba(45, 39, 115, 0.05);
  border: 1px solid rgba(45, 39, 115, 0.16);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 18px;
}

.title-divider {
  text-align: center;
  color: var(--brand-indigo);
  font-weight: 700;
  margin: 8px 0 18px;
  letter-spacing: 0.04em;
}

.paragraph-card label,
.ad-card label,
.question-block legend,
.summary-block h4,
.choices-card h4 {
  font-weight: 700;
  color: var(--text);
}

.panel-grid {
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  gap: 22px;
}

.question-stack {
  display: grid;
  gap: 18px;
}

.question-block {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin: 0;
}

.question-block legend {
  padding: 0 8px;
}

.choices {
  display: grid;
  gap: 12px;
}

.choice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.55;
}

.choice input {
  margin-top: 3px;
  accent-color: var(--brand-indigo);
}

.review-card {
  padding: 18px 20px;
  margin-top: 18px;
}

.review-card strong {
  display: block;
  margin-bottom: 8px;
}

.review-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.fill-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.summary-block,
.choices-card {
  display: grid;
  gap: 18px;
}

.summary-block h4,
.choices-card h4 {
  margin: 0;
  font-size: 1.15rem;
}

.summary-copy {
  color: var(--text);
  line-height: 1.8;
}

.result-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 24px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
}

.result-copy h4 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.result-copy p {
  margin: 0;
  color: var(--muted);
}

.score-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(45, 39, 115, 0.2);
  background: rgba(45, 39, 115, 0.08);
  color: var(--brand-indigo);
  font-weight: 700;
}

.action-bar {
  position: sticky;
  bottom: 16px;
  z-index: 25;
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.action-panel,
.part-dock {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.action-panel {
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  gap: 14px;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.primary-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 14px 18px;
  font-weight: 700;
}

.button-icon {
  width: 18px;
  height: 18px;
  display: inline-grid;
  place-items: center;
  flex: 0 0 18px;
}

.button-icon svg,
.primary-button svg,
.ghost-button svg {
  width: 17px;
  height: 17px;
  display: block;
  flex: 0 0 auto;
}

.primary-button {
  flex: 1 1 320px;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  color: #fff;
  border: none;
  box-shadow: 0 16px 22px rgba(45, 39, 115, 0.22);
}

.ghost-button {
  flex: 0 1 180px;
  background: #fff;
  color: var(--brand-indigo);
  border: 1px solid rgba(45, 39, 115, 0.2);
}

.part-dock {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 10px;
  border-radius: 18px;
}

.part-dock::-webkit-scrollbar {
  height: 8px;
}

.part-dock::-webkit-scrollbar-thumb {
  background: rgba(45, 39, 115, 0.18);
  border-radius: 999px;
}

.part-tab {
  flex: 0 0 auto;
  min-width: 124px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 12px;
  padding: 11px 12px;
  text-align: left;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.part-tab strong,
.part-tab span {
  display: block;
}

.part-tab strong {
  margin-bottom: 3px;
  font-size: 0.88rem;
}

.part-tab span {
  font-size: 0.76rem;
  color: var(--muted);
}

.part-tab.active {
  color: #fff;
  background: linear-gradient(135deg, #352d85 0%, var(--brand-indigo) 100%);
  border-color: transparent;
  box-shadow: 0 14px 24px rgba(45, 39, 115, 0.22);
}

.part-tab.active span {
  color: rgba(255, 255, 255, 0.84);
}

.answer-key-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.96);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.answer-key-panel h4 {
  margin: 0 0 14px;
  font-size: 1.1rem;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.answer-group {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: var(--bg);
}

.answer-group strong {
  display: block;
  margin-bottom: 10px;
}

.answer-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.answer-group li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9rem;
}

.empty-state {
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  padding: 38px 24px;
  text-align: center;
  background: rgba(255, 255, 255, 0.78);
}

.empty-state h2 {
  margin: 0 0 8px;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
}

.ielts-library-grid {
  display: grid;
  gap: 18px;
}

.ielts-library-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  padding: 22px;
  box-shadow: 0 18px 36px rgba(18, 35, 55, 0.08);
  animation: fade-rise 0.55s ease both;
}

.ielts-library-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}

.ielts-library-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ielts-library-card h3 {
  margin: 12px 0 8px;
  font-size: 1.5rem;
}

.ielts-library-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.ielts-exam-page,
.ielts-results-page {
  width: calc(100vw - 28px);
  margin-left: calc(50% - 50vw + 14px);
  margin-right: calc(50% - 50vw + 14px);
}

.ielts-exam-page {
  width: 100%;
  height: 100svh;
  min-height: 100svh;
  margin: 0;
  padding: 0;
  background: #fff;
  font-family: Arial, "Helvetica Neue", sans-serif;
  overflow: hidden;
  display: grid;
  grid-template-rows: 56px auto minmax(0, 1fr);
}

.ielts-exam-topbar {
  position: relative;
  height: 56px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  gap: 18px;
  background: #fff;
  border-bottom: 1px solid #e5e5e5;
}

.ielts-exam-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.ielts-back-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 8px;
  background: #f3f4f7;
  color: #111827;
  font-size: 14px;
  font-weight: 500;
}

.ielts-logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 2px;
  background: #e8202a;
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.ielts-exam-id {
  color: #6b7280;
  font-size: 14px;
  font-weight: 400;
}

.ielts-exam-middle {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.ielts-timer-value {
  color: #111827;
  font-size: 16px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0;
}

.ielts-exam-start {
  position: absolute;
  left: calc(50% + 44px);
  display: inline-flex;
  align-items: center;
}

.ielts-start-button {
  min-height: 36px;
  padding: 0 16px;
  border: none;
  border-radius: 8px;
  background: #e8202a;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.18s ease;
}

.ielts-start-button:hover,
.ielts-start-button:focus-visible {
  outline: none;
  filter: brightness(1.04);
}

.ielts-start-button.is-live,
.ielts-start-button:disabled {
  opacity: 0.72;
  cursor: default;
  filter: none;
}

.ielts-exam-tools {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin-left: auto;
}

.ielts-tool-button {
  width: 22px;
  height: 22px;
  border: none;
  padding: 0;
  background: transparent;
  color: #6b7280;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.ielts-tool-button svg {
  width: 20px;
  height: 20px;
}

.ielts-intro-strip {
  margin: 12px 12px 0;
  border: 1px solid #d9ddd2;
  border-radius: 4px;
  background: #efefe6;
  padding: 14px 18px 13px;
}

.ielts-intro-strip h2 {
  margin: 0 0 4px;
  color: #111827;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.3;
}

.ielts-intro-strip p {
  margin: 0;
  color: #475467;
  font-size: 14px;
  line-height: 1.45;
}

.ielts-mobile-switch {
  display: none;
  margin: 10px 12px 0;
  padding: 4px;
  border-radius: 14px;
  background: #f3f4f7;
  border: 1px solid #e5e7eb;
  gap: 6px;
}

.ielts-mobile-switch-button {
  flex: 1 1 0;
  min-height: 40px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: #667085;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.ielts-mobile-switch-button.is-active {
  background: #fff;
  color: #111827;
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.08);
}

.ielts-exam-main {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  padding: 12px 0 76px;
  box-sizing: border-box;
  overflow: hidden;
  background: #fff;
}

.ielts-split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) 16px minmax(0, 1fr);
  align-items: stretch;
  flex: 1 1 auto;
  gap: 0;
  min-height: 0;
  transition: grid-template-columns 0.08s linear;
  padding: 0 0 12px;
}

.ielts-passage-panel,
.ielts-question-panel {
  height: auto;
  min-height: 0;
  max-height: none;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  border-radius: 4px;
  background: #fff;
  padding: 24px;
  box-shadow: none;
  border: 1px solid #ececec;
  scrollbar-gutter: stable;
}

.ielts-passage-panel h2 {
  margin: 0 0 14px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
}

.ielts-passage-text {
  font-size: 16px;
  line-height: 1.75;
  color: #111827;
}

.ielts-passage-text p {
  margin: 0 0 22px;
}

.ielts-divider {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: col-resize;
  touch-action: none;
  user-select: none;
}

.ielts-divider::before {
  content: "";
  width: 1px;
  height: 100%;
  background: #e5e5e5;
}

.ielts-divider-handle {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 1px solid #d1d5db;
  background: #fff;
  color: #6b7280;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.ielts-divider-handle svg {
  width: 10px;
  height: 10px;
}

body.is-resizing-ielts,
body.is-resizing-ielts * {
  cursor: col-resize !important;
}

.ielts-question-group + .ielts-question-group {
  margin-top: 26px;
}

.ielts-question-group h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
}

.ielts-question-instruction {
  margin: 0 0 14px;
  color: #111827;
  font-size: 16px;
  line-height: 1.55;
}

.ielts-question-stack {
  display: grid;
  gap: 24px;
}

.ielts-question-card {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 0;
  border-top: none;
}

.ielts-question-card:first-child {
  padding-top: 0;
}

.ielts-question-number,
.ielts-note-number {
  width: auto;
  height: auto;
  border: none;
  border-radius: 0;
  display: block;
  background: transparent;
  color: #8f8f8f;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  padding-top: 2px;
}

.ielts-answer-number {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 24px;
  background: #cbd5e1;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}

.ielts-question-prompt {
  margin: 0;
  color: #111827;
  font-size: 16px;
  line-height: 1.6;
}

.ielts-option-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  margin-left: 24px;
}

.ielts-option {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: none;
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
}

.ielts-option:hover,
.ielts-option:focus-within {
  transform: none;
  background: #faf7f7;
}

.ielts-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.ielts-option-bullet {
  width: 16px;
  height: 16px;
  border: 1.5px solid #999;
  border-radius: 999px;
  flex: 0 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
}

.ielts-option.is-selected .ielts-option-bullet::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: #cc0000;
}

.ielts-option.is-selected .ielts-option-bullet {
  border: 2px solid #cc0000;
}

.ielts-option.is-selected {
  background: #f8dada;
}

.ielts-option.is-correct .ielts-option-bullet {
  border-color: #16a34a;
}

.ielts-option.is-correct .ielts-option-bullet::before {
  background: #16a34a;
}

.ielts-option.is-wrong .ielts-option-bullet {
  border-color: #cc0000;
}

.ielts-option-hint {
  margin-left: auto;
  font-size: 0.74rem;
  font-weight: 700;
}

.ielts-option > span:not(.ielts-option-bullet):not(.ielts-option-hint) {
  color: #333;
  font-size: 16px;
  line-height: 1.5;
}

.ielts-option-hint.is-correct {
  color: #16a34a;
}

.ielts-option-hint.is-wrong {
  color: #dc2626;
}

.ielts-notes-panel {
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 0;
}

.ielts-notes-panel h4 {
  margin: 0 0 14px;
  text-align: left;
  font-size: 1rem;
  font-weight: 700;
}

.ielts-note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.ielts-note-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 12px;
  align-items: flex-start;
}

.ielts-note-copy p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
}

.ielts-note-input {
  width: 120px;
  height: 28px;
  min-height: 28px;
  margin: 0 4px;
  padding: 0 2px 1px;
  border: none;
  border-bottom: 2px solid #333;
  border-radius: 0;
  background: transparent;
  color: #111827;
  font-weight: 600;
  font-size: 14px;
  text-align: left;
  vertical-align: baseline;
}

.ielts-note-input--short {
  width: 120px;
}

.ielts-note-input--medium {
  width: 120px;
}

.ielts-note-input.is-correct {
  border-bottom-color: #16a34a;
  background: transparent;
  color: #166534;
}

.ielts-note-input.is-wrong {
  border-bottom-color: #cc0000;
  background: transparent;
  color: #9f1239;
}

.ielts-note-input.is-empty {
  border-bottom-color: #333;
  background: transparent;
}

.ielts-note-feedback {
  margin: 6px 0 0;
  font-size: 0.76rem;
  font-weight: 700;
}

.ielts-note-feedback.is-correct {
  color: #16a34a;
}

.ielts-note-feedback.is-wrong {
  color: #dc2626;
}

.ielts-bottom-shell {
  position: static;
}

.bottom-bar {
  position: fixed;
  bottom: 28px;
  left: 0;
  right: 0;
  height: 48px;
  background: white;
  border-top: 1px solid #e0e0e0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 100;
}

.ielts-bottom-spacer {
  flex: 0 0 76px;
}

.ielts-bottom-center {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
}

.ielts-bottom-center-label {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.ielts-bottom-center-label strong {
  color: #111827;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.ielts-bottom-question-list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 2px;
}

.ielts-question-jump {
  min-width: 24px;
  height: 24px;
  padding: 0 6px;
  border: 1px solid #d2d6dc;
  border-radius: 3px;
  background: #fff;
  color: #3f3f46;
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  position: relative;
}

.ielts-question-jump:hover,
.ielts-question-jump:focus-visible {
  outline: none;
  border-color: #b6bcc4;
  color: #111827;
}

.ielts-question-jump::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 1px;
  right: 1px;
  height: 3px;
  border-radius: 999px;
  background: #d6dbe3;
}

.ielts-question-jump.is-answered {
  border-color: #9ca3af;
  background: #fff;
  color: #111827;
}

.ielts-question-jump.is-answered::before {
  background: #18c15a;
}

.ielts-question-jump.is-current {
  border-color: #111827;
  background: #fff;
  color: #111827;
  box-shadow: none;
}

.topnav::-webkit-scrollbar,
.ielts-bottom-question-list::-webkit-scrollbar {
  display: none;
}

.nav-arrows {
  display: flex;
  gap: 4px;
  flex: 0 0 76px;
  justify-content: flex-end;
}

.arrow-btn {
  width: 36px;
  height: 36px;
  background-color: #1a1a1a;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: filter 0.18s ease;
}

.arrow-btn:hover,
.arrow-btn:focus-visible,
.checkmark-row:hover,
.checkmark-row:focus-visible {
  outline: none;
  filter: brightness(1.06);
}

.checkmark-row {
  position: fixed;
  bottom: 0;
  right: 16px;
  height: 28px;
  background: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 4px;
  z-index: 100;
  color: #333;
  font-size: 16px;
  cursor: pointer;
  user-select: none;
}

.ielts-results-page {
  padding: 34px 0 64px;
}

.ielts-results-card {
  width: min(960px, calc(100% - 24px));
  margin: 0 auto;
  border: 1px solid #e5e7eb;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.98);
  padding: 34px 28px 28px;
  box-shadow: 0 26px 52px rgba(18, 35, 55, 0.1);
}

.ielts-results-check {
  width: 64px;
  height: 64px;
  margin: 0 auto 14px;
  border-radius: 999px;
  color: #22c55e;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(34, 197, 94, 0.18);
  background: #f0fdf4;
}

.ielts-results-check svg {
  width: 34px;
  height: 34px;
}

.ielts-results-card > h1,
.ielts-results-card > p {
  text-align: center;
}

.ielts-results-card > h1 {
  margin: 0 0 6px;
  font-size: 2rem;
}

.ielts-results-card > p {
  margin: 0 0 24px;
  color: #6b7280;
}

.ielts-results-score {
  border: 1px solid #eef2f7;
  border-radius: 18px;
  background: #fff;
  padding: 18px;
  margin-bottom: 18px;
}

.ielts-results-score-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.ielts-results-score-head strong {
  color: #ef4444;
  font-size: 1.7rem;
}

.ielts-results-progress {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #eef2f7;
  overflow: hidden;
}

.ielts-results-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #f87171 0%, #ef4444 100%);
}

.ielts-answer-sheet {
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  background: #fff;
  padding: 18px;
}

.ielts-answer-sheet-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.ielts-answer-sheet-head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.ielts-correct-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #475467;
  font-size: 0.9rem;
}

.ielts-correct-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.ielts-correct-toggle-switch {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: #fca5a5;
  position: relative;
  transition: background 0.18s ease;
}

.ielts-correct-toggle-switch::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: #fff;
  transition: transform 0.18s ease;
}

.ielts-correct-toggle input:checked + .ielts-correct-toggle-switch {
  background: #ef4444;
}

.ielts-correct-toggle input:checked + .ielts-correct-toggle-switch::before {
  transform: translateX(18px);
}

.ielts-answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 16px;
}

.ielts-answer-item {
  display: flex;
  align-items: center;
  gap: 12px;
  border-radius: 12px;
  background: #f8fafc;
  padding: 12px 14px;
}

.ielts-answer-copy {
  display: grid;
  gap: 2px;
  font-size: 0.88rem;
}

.ielts-answer-copy strong {
  color: #16a34a;
}

.ielts-answer-status {
  margin-left: auto;
  font-size: 0.78rem;
  font-weight: 800;
}

.ielts-answer-status.is-correct {
  color: #16a34a;
}

.ielts-answer-status.is-wrong {
  color: #dc2626;
}

.ielts-results-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.ielts-result-button {
  min-height: 52px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #f8fafc;
  color: #111827;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.ielts-result-button:hover,
.ielts-result-button:focus-visible {
  outline: none;
  transform: translateY(-1px);
  box-shadow: 0 12px 18px rgba(15, 23, 42, 0.08);
}

.ielts-result-button.is-danger {
  border-color: transparent;
  background: linear-gradient(135deg, #ff6b6b 0%, #ef4444 100%);
  color: #fff;
}

@keyframes fade-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  #app {
    width: min(100%, calc(100% - 30px));
  }

  .topbar {
    width: min(100%, calc(100% - 30px));
  }

  .page-divider {
    margin-left: -15px;
    margin-right: -15px;
  }

  .tool-grid,
  .skill-grid,
  .flash-topic-grid,
  .article-grid,
  .grammar-grid,
  .test-grid,
  .answer-grid,
  .ielts-answer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer-brand {
    grid-column: 1 / -1;
  }

  .ielts-exam-topbar {
    height: auto;
    min-height: 56px;
    padding: 12px 16px;
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .ielts-exam-page {
    grid-template-rows: auto auto minmax(0, 1fr);
    overflow: hidden;
  }

  .ielts-exam-middle,
  .ielts-exam-start {
    position: static;
    transform: none;
  }

  .ielts-exam-main {
    min-height: 0;
    display: flex;
    flex-direction: column;
    padding: 12px 0 82px;
  }

  .ielts-mobile-switch {
    display: flex;
  }

  .ielts-split-layout {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
    padding: 0 12px 12px;
  }

  .ielts-split-layout[data-ielts-mobile-panel="passage"] .ielts-panel--questions,
  .ielts-split-layout[data-ielts-mobile-panel="questions"] .ielts-panel--passage,
  .ielts-split-layout[data-ielts-mobile-panel="passage"] .ielts-divider,
  .ielts-split-layout[data-ielts-mobile-panel="questions"] .ielts-divider {
    display: none;
  }

  .ielts-divider {
    display: none;
  }

  .ielts-passage-panel,
  .ielts-question-panel {
    flex: 1 1 auto;
    min-height: 0;
    height: auto;
    max-height: none;
  }

  .ielts-bottom-center {
    flex-wrap: wrap;
    justify-content: center;
    padding: 0;
  }

  .ielts-bottom-spacer,
  .nav-arrows {
    width: auto;
    flex: 0 0 auto;
  }

  .ielts-bottom-question-list {
    flex-wrap: wrap;
  }

  .bottom-bar {
    padding: 0 14px;
  }

  .checkmark-row {
    right: 14px;
  }
}

@media (max-width: 920px) {
  .flash-study-head,
  .flash-study-controls {
    grid-template-columns: 1fr;
  }

  .flash-study-copy,
  .flash-study-actions {
    justify-content: center;
  }

  .topbar {
    align-items: flex-start;
    grid-template-columns: 1fr;
    justify-content: center;
    padding: 18px 0;
  }

  .topnav {
    justify-content: flex-start;
    justify-self: stretch;
  }

  .topbar-telegram {
    justify-self: start;
  }

  .panel-grid,
  .fill-grid {
    grid-template-columns: 1fr;
  }

  .reading-path-grid {
    grid-template-columns: 1fr;
  }

  .article-detail-head {
    flex-direction: column;
  }

  .grammar-hero,
  .grammar-detail-head,
  .grammar-detail-grid {
    grid-template-columns: 1fr;
  }

  .grammar-hero,
  .grammar-detail-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-footer-inner {
    grid-template-columns: 1fr;
  }

  .support-bank-meta {
    grid-template-columns: 1fr;
  }

  .grammar-detail-grid {
    display: grid;
  }

  .test-header-top,
  .meta-row,
  .topbar,
  .subject-hero {
    align-items: flex-start;
  }

  .ielts-exam-left,
  .ielts-answer-sheet-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .ielts-results-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1024px) {
  :root {
    --grid-size: 32px;
  }
}

@media (max-width: 760px) {
  :root {
    --grid-size: 30px;
  }

  #app {
    width: min(100%, calc(100% - 22px));
    padding-top: 16px;
  }

  .ambient-grid-corner {
    opacity: 0.055;
  }

  .ambient-grid-pointer {
    -webkit-mask-image: radial-gradient(168px 168px at var(--pointer-x) var(--pointer-y), rgba(0, 0, 0, 0.94) 0%, rgba(0, 0, 0, 0.74) 34%, rgba(0, 0, 0, 0.38) 56%, transparent 78%);
    mask-image: radial-gradient(168px 168px at var(--pointer-x) var(--pointer-y), rgba(0, 0, 0, 0.94) 0%, rgba(0, 0, 0, 0.74) 34%, rgba(0, 0, 0, 0.38) 56%, transparent 78%);
  }

  .topbar,
  .test-header-top,
  .meta-row,
  .result-strip {
    align-items: stretch;
  }

  .brand-mark,
  .test-centerline,
  .mode-row {
    justify-content: center;
  }

  .topbar-brand {
    justify-self: center;
  }

  .topnav {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 0 2px 6px;
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  .topbar-telegram {
    justify-self: center;
    width: min(100%, 260px);
    justify-content: center;
  }

  .hero-copy h1 {
    font-size: 1.95rem;
  }

  .dashboard-section-head h2 {
    font-size: 1.7rem;
  }

  .flashcards-hero h1,
  .flash-study-copy h1 {
    font-size: 1.8rem;
  }

  .articles-hero {
    padding: 42px 0;
  }

  .subject-copy h1,
  .section-head h2 {
    font-size: 1.65rem;
  }

  .tool-grid,
  .skill-grid,
  .flash-topic-grid,
  .article-grid,
  .grammar-grid,
  .test-grid,
  .answer-grid,
  .ielts-answer-grid {
    grid-template-columns: 1fr;
  }

  .content-card,
  .intro-card {
    padding: 16px;
  }

  .article-detail-shell {
    width: min(100%, calc(100% - 22px));
    margin-top: -48px;
  }

  .join-modal-card,
  .support-card {
    padding-left: 20px;
    padding-right: 20px;
  }

  .site-footer {
    margin-top: 42px;
  }

  .article-detail-card {
    padding: 24px 20px;
    border-radius: 22px;
  }

  .grammar-video-panel,
  .grammar-notes-panel {
    border-radius: 22px;
  }

  .flash-card-3d {
    height: 330px;
  }

  .action-panel {
    padding: 14px;
  }

  .ielts-exam-topbar {
    gap: 8px;
    padding: 10px 12px;
  }

  .ielts-logo-badge {
    min-height: 34px;
    padding: 0 12px;
    font-size: 14px;
  }

  .ielts-exam-id {
    font-size: 13px;
  }

  .ielts-timer-value {
    font-size: 18px;
  }

  .ielts-intro-strip {
    margin: 10px 10px 0;
    padding: 12px;
  }

  .ielts-mobile-switch {
    display: flex;
  }

  .ielts-exam-main {
    min-height: 0;
    display: flex;
    flex-direction: column;
    padding: 10px 0 86px;
  }

  .ielts-split-layout {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
    padding: 0 10px 10px;
  }

  .ielts-split-layout[data-ielts-mobile-panel="passage"] .ielts-panel--questions,
  .ielts-split-layout[data-ielts-mobile-panel="questions"] .ielts-panel--passage,
  .ielts-split-layout[data-ielts-mobile-panel="passage"] .ielts-divider,
  .ielts-split-layout[data-ielts-mobile-panel="questions"] .ielts-divider {
    display: none;
  }

  .ielts-passage-panel,
  .ielts-question-panel {
    flex: 1 1 auto;
    min-height: 0;
    height: auto;
    padding: 18px 14px 22px;
  }

  .ielts-question-card,
  .ielts-note-item {
    grid-template-columns: 1fr;
  }

  .ielts-question-number,
  .ielts-note-number {
    margin-bottom: 8px;
  }

  .ielts-option {
    align-items: flex-start;
  }

  .bottom-bar {
    bottom: calc(24px + env(safe-area-inset-bottom));
    height: auto;
    min-height: 52px;
    padding: 8px 12px;
    gap: 10px;
  }

  .ielts-bottom-spacer {
    display: none;
  }

  .ielts-bottom-center {
    justify-content: flex-start;
    gap: 8px;
    padding: 0;
    overflow: hidden;
  }

  .ielts-bottom-question-list {
    gap: 6px;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  .ielts-question-jump {
    min-width: 24px;
    height: 28px;
  }

  .checkmark-row {
    bottom: env(safe-area-inset-bottom);
    right: 12px;
    height: 24px;
    background: #fff;
  }

  .flash-study-head {
    gap: 12px;
    margin-bottom: 14px;
  }

  .flash-study-copy {
    order: -1;
  }

  .flash-progress-meta {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  .flash-study-controls {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .flash-nav-button {
    width: 100%;
    justify-content: center;
  }

  .support-shell {
    padding-top: 10px;
  }

  .support-card {
    padding: 26px 18px;
    border-radius: 22px;
  }

  .support-card-number {
    padding: 14px 12px;
    font-size: 1.02rem;
    letter-spacing: 0.1em;
  }

  .support-copy-button,
  .support-send-button {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 560px) {
  .dashboard-card,
  .skill-card {
    padding-left: 16px;
    padding-right: 16px;
  }

  .articles-hero-inner,
  .article-detail-hero-inner {
    width: min(100%, calc(100% - 22px));
  }

  .support-fab {
    bottom: 12px;
  }

  .topbar {
    gap: 12px;
    min-height: 78px;
  }

  .brand-mark {
    font-size: 1.18rem;
  }

  .topnav-link {
    padding: 8px 10px;
    font-size: 0.94rem;
    white-space: nowrap;
  }

  .site-footer-inner,
  .site-footer-bottom {
    width: min(100%, calc(100% - 22px));
  }

  .article-detail-hero {
    min-height: 280px;
  }

  .article-detail-hero-inner {
    min-height: 280px;
  }

  .article-preview-body strong,
  .article-section h2 {
    font-size: 1.28rem;
  }

  .grammar-card-body strong {
    font-size: 1.18rem;
  }

  .grammar-detail-copy h1 {
    font-size: 1.9rem;
  }

  .flash-card-3d {
    height: 350px;
  }

  .flash-card-front {
    padding: 26px;
  }

  .flash-card-back {
    padding: 20px;
  }

  .subject-hero {
    flex-direction: column;
    align-items: flex-start;
  }

  .subject-copy p,
  .section-head p {
    line-height: 1.65;
  }

  .ielts-results-actions {
    grid-template-columns: 1fr;
  }

  .ielts-start-button {
    width: auto;
  }

  .ielts-exam-tools {
    gap: 8px;
  }

  .ielts-tool-button:not([data-ielts-fullscreen]) {
    display: none;
  }

  .ielts-exam-left {
    gap: 10px;
    flex-wrap: wrap;
  }

  .ielts-back-button {
    min-height: 34px;
    padding: 0 10px;
    font-size: 13px;
  }

  .ielts-exam-topbar {
    min-height: 54px;
  }

  .ielts-exam-middle,
  .ielts-exam-start {
    position: static;
    transform: none;
  }

  .ielts-exam-start {
    margin-left: auto;
  }

  .ielts-bottom-center-label strong {
    font-size: 14px;
  }

  .ielts-results-card {
    padding: 22px 16px;
  }

  .blank-input.short,
  .blank-input.medium,
  .blank-input.long {
    width: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ambient-grid-pointer,
  .ambient-grid-glow {
    transition: none;
  }

  .topbar-telegram-text-join,
  .topbar-telegram-text-channel {
    animation: none;
    transition: none;
  }

  .topbar-telegram-text-join {
    opacity: 0;
  }

  .topbar-telegram-text-channel {
    opacity: 1;
    transform: translateY(0);
  }
}