:root {
  --paper: #ffffff;
  --panel: #ffffff;
  --ink: #111111;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --blue: #0071e3;
  --blue-deep: #005bb5;
  --mint: #ecfdf3;
  --sky: #eff6ff;
  --berry: #1d1d1f;
  --success: #15803d;
  --warn: #b45309;
  --danger: #b42318;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: #ffffff;
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

button,
input,
select {
  font: inherit;
}

.site-shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding-bottom: 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0 10px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand strong {
  display: block;
  font-size: 1.1rem;
}

.brand small {
  color: var(--muted);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #111111, #4b4b4f);
  color: white;
  font-weight: 800;
  font-size: 1.2rem;
  box-shadow: var(--shadow);
}

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

.topnav a,
.ghost-button,
.primary-link {
  padding: 10px 14px;
  border-radius: 999px;
}

.topnav a:hover,
.ghost-button:hover,
.primary-link:hover {
  background: #f9fafb;
}

.primary-link,
.primary-button,
.secondary-button,
.ghost-button,
.result-button {
  border: 0;
  cursor: pointer;
}

.primary-button,
.primary-link {
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: white;
  box-shadow: var(--shadow);
}

.secondary-button {
  background: #f5f5f7;
  color: var(--ink);
  border: 1px solid var(--line);
}

.ghost-button {
  background: #ffffff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.primary-button:disabled,
.ghost-button:disabled {
  opacity: 0.56;
  cursor: not-allowed;
}

.credit-pill {
  padding: 9px 14px;
  border-radius: 999px;
  background: #f5f5f7;
  color: var(--berry);
  font-weight: 700;
}

.page-wrap {
  display: grid;
  gap: 22px;
}

.flash-stack {
  display: grid;
  gap: 10px;
  margin: 8px 0 6px;
}

.flash {
  padding: 14px 18px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.flash-success {
  color: var(--success);
}

.flash-error {
  color: var(--danger);
}

.hero,
.page-hero,
.panel,
.feature-card,
.price-card,
.word-card,
.stat-card,
.auth-panel,
.stack-card,
.word-chip,
.mini-card {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 24px;
  border-radius: 24px;
  padding: 34px;
}

.hero-copy h1,
.page-hero h1,
.auth-panel h1,
.detail-panel h1 {
  margin: 10px 0 12px;
  line-height: 1.05;
  font-size: clamp(2.1rem, 4vw, 4.1rem);
}

.hero-copy p,
.page-hero p,
.auth-panel p,
.panel p {
  color: var(--muted);
  line-height: 1.75;
}

.eyebrow {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  background: #f5f5f7;
  color: #1d1d1f;
  font-size: 0.84rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.hero-metrics,
.detail-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0 0;
}

.hero-metrics div,
.detail-meta div {
  padding: 16px;
  border-radius: 18px;
  background: #fafafa;
  border: 1px solid #f0f0f0;
}

.hero-metrics dt,
.detail-meta dt {
  font-size: 0.82rem;
  color: var(--muted);
}

.hero-metrics dd,
.detail-meta dd {
  margin: 8px 0 0;
  font-weight: 700;
}

.hero-art {
  display: grid;
  align-items: center;
  gap: 18px;
}

.stack-card {
  border-radius: 20px;
  padding: 24px;
}

.mini-label {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: #f3f4f6;
  font-weight: 700;
}

.mini-emoji {
  font-size: 5rem;
  line-height: 1;
  margin: 16px 0;
}

.tilt-left {
  transform: rotate(-2deg);
}

.tilt-right {
  transform: rotate(2deg) translateX(-6px);
}

.grid-section {
  display: grid;
  gap: 20px;
}

.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-card,
.stat-card,
.price-card,
.word-card,
.auth-panel,
.panel {
  border-radius: 20px;
  padding: 24px;
}

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

.plain-list,
.list-stack {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.plain-list li {
  color: var(--muted);
  line-height: 1.6;
}

.list-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #fafafa;
  border: 1px solid #f2f4f7;
}

.list-row span,
.mini-card span,
.word-chip span,
.word-card span,
.word-card small,
.helper-text,
.empty-copy,
.prompt-box {
  color: var(--muted);
}

.mini-card-grid,
.chip-grid,
.library-grid,
.pricing-grid,
.stats-grid {
  display: grid;
  gap: 16px;
}

.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: 2rem;
}

.mini-card-grid,
.library-grid,
.pricing-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mini-card,
.word-chip {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 16px;
}

.mini-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 16px;
}

.chip-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.word-chip strong,
.word-card strong,
.panel h2,
.price-card h2 {
  font-size: 1.1rem;
}

.cta-band {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-radius: 20px;
  padding: 28px;
  background: #f5f5f7;
  border: 1px solid var(--line);
}

.apple-hero {
  display: grid;
  gap: 40px;
  padding: 54px 0 18px;
}

.apple-hero-copy {
  display: grid;
  gap: 14px;
  justify-items: center;
  text-align: center;
}

.apple-kicker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 14px;
  border-radius: 999px;
  background: #f5f5f7;
  color: #1d1d1f;
  font-size: 0.86rem;
  font-weight: 700;
}

.apple-hero-copy h1 {
  max-width: 980px;
  margin: 0;
  letter-spacing: -0.045em;
  line-height: 0.98;
  font-size: clamp(3rem, 7vw, 5.8rem);
}

.apple-hero-copy p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
  font-size: 1.08rem;
}

.apple-device-frame {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 18px;
  border-radius: 38px;
  background: linear-gradient(180deg, #f7f7f9 0%, #ececf0 100%);
  border: 1px solid #dedee3;
  box-shadow: 0 36px 80px rgba(0, 0, 0, 0.08);
}

.apple-device-screen {
  display: grid;
  gap: 18px;
  padding: 26px;
  min-height: 420px;
  border-radius: 28px;
  background: #fbfbfd;
}

.device-card-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.device-card {
  display: grid;
  gap: 10px;
  padding: 24px;
  border-radius: 24px;
  background: #ffffff;
  border: 1px solid #ececf1;
}

.device-card-main {
  min-height: 240px;
  align-content: start;
  background: linear-gradient(180deg, #ffffff 0%, #f7f8fa 100%);
}

.device-card h2 {
  margin: 8px 0 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.1;
}

.device-card p,
.device-card span {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.apple-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 16px 0 8px;
}

.apple-metrics div {
  padding: 22px 24px;
  border-radius: 24px;
  background: #f5f5f7;
  border: 1px solid #e5e5ea;
}

.apple-metrics dt {
  color: var(--muted);
  font-size: 0.92rem;
}

.apple-metrics dd {
  margin: 10px 0 0;
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.45;
}

.apple-section,
.apple-band,
.apple-cta {
  display: grid;
  gap: 26px;
  padding: 36px 0;
}

.section-heading {
  display: grid;
  gap: 10px;
  justify-items: center;
  text-align: center;
}

.section-heading.narrow {
  max-width: 720px;
  margin: 0 auto;
}

.section-heading h2,
.apple-cta h2 {
  margin: 0;
  letter-spacing: -0.04em;
  line-height: 1.04;
  font-size: clamp(2.2rem, 5vw, 4.3rem);
}

.section-heading p,
.apple-cta p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 1.05rem;
}

.apple-feature-grid,
.apple-library-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.apple-feature-card,
.apple-library-card {
  display: grid;
  gap: 12px;
  min-height: 220px;
  padding: 28px;
  border-radius: 28px;
  background: #f5f5f7;
  border: 1px solid #e5e5ea;
}

.apple-feature-card h3,
.apple-library-card h3 {
  margin: 0;
  font-size: 1.45rem;
}

.apple-feature-card p,
.apple-library-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.apple-band {
  padding: 44px 28px;
  border-radius: 34px;
  background: #000000;
}

.apple-band .section-heading h2,
.apple-band .section-heading p,
.apple-band .apple-kicker,
.dark-card h3,
.dark-card p {
  color: #ffffff;
}

.apple-band .apple-kicker {
  background: rgba(255, 255, 255, 0.12);
}

.dark-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.apple-cta {
  justify-items: center;
  text-align: center;
  padding-bottom: 58px;
}

.center-actions {
  justify-content: center;
}

.compact-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-radius: 20px;
  padding: 24px 28px;
}

.auth-shell {
  display: grid;
  place-items: center;
  min-height: calc(100vh - 180px);
}

.auth-panel {
  width: min(520px, 100%);
}

.stack-form {
  display: grid;
  gap: 14px;
}

.stack-form label,
.filter-row label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 700;
}

.stack-form span,
.filter-row span {
  font-size: 0.92rem;
}

.stack-form input,
.stack-form select,
.filter-row select,
.filter-row input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 14px 16px;
  background: #ffffff;
}

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

.inline-toggle {
  display: flex !important;
  align-items: center;
  gap: 10px;
}

.inline-toggle input {
  width: auto;
}

.composer-grid,
.review-layout,
.card-layout,
.learn-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.learn-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tone-panel {
  background: #ffffff;
}

.detail-image,
.review-image {
  width: 100%;
  border-radius: 18px;
  object-fit: cover;
  border: 1px solid #f2f4f7;
}

.story-flip-card {
  perspective: 1200px;
}

.story-flip-inner {
  position: relative;
  min-height: 520px;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
}

.story-flip-card.is-flipped .story-flip-inner {
  transform: rotateY(180deg);
}

.story-flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 18px;
  overflow: hidden;
}

.story-flip-front {
  background: #fff;
}

.story-flip-back {
  display: grid;
  align-items: center;
  padding: 28px;
  background: linear-gradient(180deg, #fbfbfd 0%, #f5f5f7 100%);
  border: 1px solid #e5e5ea;
  transform: rotateY(180deg);
}

.story-back-copy {
  display: grid;
  gap: 12px;
}

.story-back-copy h2 {
  margin: 0;
}

.story-back-copy p {
  margin: 0;
  line-height: 1.9;
  color: #1d1d1f;
}

.flip-toggle {
  margin-top: 14px;
}

.review-flip-card .story-flip-inner {
  min-height: 420px;
}

.detail-head,
.review-word {
  display: grid;
  gap: 10px;
}

.speak-button {
  justify-self: start;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.07);
  border: 0;
  cursor: pointer;
}

.panel-subblock {
  padding-top: 18px;
  margin-top: 18px;
  border-top: 1px solid var(--line);
}

.prompt-box {
  padding: 14px 16px;
  border-radius: 18px;
  background: #fafafa;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}

.story-box {
  padding: 14px 16px;
  border-radius: 16px;
  background: #f5f5f7;
  border: 1px solid #e5e5ea;
  color: #1d1d1f;
  line-height: 1.7;
}

.sentence-box {
  padding: 16px 18px;
  border-radius: 16px;
  border: 1px solid #dbeafe;
  background: #f8fbff;
}

.sentence-box strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.sentence-box p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.learn-card {
  display: grid;
  gap: 14px;
}

.scene-index {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: #f5f5f7;
  color: #1d1d1f;
  font-weight: 700;
}

.quiz-panel {
  display: grid;
  gap: 18px;
}

.quiz-form {
  display: grid;
  gap: 16px;
}

.quiz-question {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.quiz-options {
  display: grid;
  gap: 12px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fafafa;
  cursor: pointer;
}

.quiz-option input {
  width: auto;
}

.notice-success {
  background: #f0fdf4;
}

.row-fields,
.filter-row,
.review-actions {
  display: grid;
  gap: 14px;
}

.row-fields {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.filter-row {
  grid-template-columns: 1fr 1fr auto;
  align-items: end;
}

.cards-filter {
  grid-template-columns: 1.2fr 1fr 1fr auto;
}

.review-actions {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 22px;
}

.result-button {
  padding: 16px 18px;
  border-radius: 18px;
  color: white;
  font-weight: 700;
}

.result-good {
  background: linear-gradient(135deg, #16a34a, #15803d);
}

.result-mid {
  background: linear-gradient(135deg, #6e6e73, #4b4b4f);
}

.result-bad {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.word-card {
  display: grid;
  gap: 14px;
}

.price-card strong {
  display: block;
  margin: 14px 0;
  font-size: 2rem;
}

.price-card.featured {
  background: #f5f5f7;
}

.status-box {
  padding: 16px 18px;
  border-radius: 18px;
  background: #ffffff;
  border: 1px solid var(--line);
}

.table-wrap {
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.empty-panel {
  text-align: center;
  padding: 40px 28px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  background: rgba(17, 24, 39, 0.08);
}

.status-queued {
  color: #9c5d00;
  background: rgba(255, 196, 84, 0.22);
}

.status-processing {
  color: #0053a6;
  background: rgba(96, 165, 250, 0.18);
}

.status-ready {
  color: #0f7a4f;
  background: rgba(52, 211, 153, 0.18);
}

.status-failed {
  color: #b42318;
  background: rgba(248, 113, 113, 0.18);
}

.notice-box {
  margin: 16px 0;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
}

.notice-box p {
  margin: 8px 0 0;
}

.notice-warn {
  background: #f5f5f7;
}

.notice-error {
  background: #fff1f2;
}

.danger-button,
.inline-danger {
  color: var(--danger);
}

.danger-button {
  margin-top: 12px;
}

.table-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.table-actions form {
  margin: 0;
}

.inline-danger {
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

@media (max-width: 980px) {
  .hero,
  .composer-grid,
  .review-layout,
  .card-layout,
  .learn-grid,
  .three-up,
  .two-up,
  .pricing-grid,
  .library-grid,
  .stats-grid,
  .mini-card-grid,
  .chip-grid {
    grid-template-columns: 1fr;
  }

  .topbar,
  .compact-hero,
  .cta-band {
    flex-direction: column;
    align-items: stretch;
  }

  .apple-metrics,
  .device-card-row,
  .apple-feature-grid,
  .apple-library-grid {
    grid-template-columns: 1fr;
  }

  .apple-device-screen {
    padding: 18px;
  }

  .hero-metrics,
  .detail-meta,
  .row-fields,
  .review-actions,
  .filter-row,
  .cards-filter {
    grid-template-columns: 1fr;
  }
}