/* ── Google Fonts ──────────────────────────────── */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+TC:wght@300;400;500;700&display=swap");

/* ── Design Tokens ─────────────────────────────── */
:root {
  --shell: 1140px;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --transition: 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-slow: 360ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font: "Inter", "Noto Sans TC", ui-sans-serif, -apple-system, sans-serif;
}

/* ── Dark Theme ─────────────────────────────────── */
body[data-theme="dark"] {
  --bg-base: #080d1e;
  --bg: #080d1e;
  --surface: rgba(15, 20, 45, 0.78);
  --surface-strong: #111830;
  --surface-hover: rgba(30, 40, 75, 0.9);
  --text: #edf0ff;
  --text-secondary: #c5cde8;
  --muted: #8893b8;
  --line: rgba(130, 150, 255, 0.15);
  --line-strong: rgba(130, 150, 255, 0.28);
  --accent: #6eb5ff;
  --accent-warm: #a78bfa;
  --accent-strong: #7c5cff;
  --ok: #5eead4;
  --danger: #ff6b8b;
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.35);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
  --glow-accent: 0 0 24px rgba(124, 92, 255, 0.25);
  --glow-ok: 0 0 16px rgba(94, 234, 212, 0.2);
}

/* ── Light Theme ─────────────────────────────────── */
body[data-theme="light"] {
  --bg-base: #f0f4ff;
  --bg: #f0f4ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --surface-hover: rgba(240, 244, 255, 0.98);
  --text: #111827;
  --text-secondary: #374151;
  --muted: #6b7280;
  --line: rgba(99, 102, 241, 0.15);
  --line-strong: rgba(99, 102, 241, 0.3);
  --accent: #4f46e5;
  --accent-warm: #7c3aed;
  --accent-strong: #4338ca;
  --ok: #059669;
  --danger: #e11d48;
  --shadow-sm: 0 2px 8px rgba(79, 70, 229, 0.08);
  --shadow: 0 6px 24px rgba(79, 70, 229, 0.1), 0 1px 0 rgba(255,255,255,0.9) inset;
  --shadow-lg: 0 20px 48px rgba(79, 70, 229, 0.15);
  --glow-accent: 0 0 20px rgba(79, 70, 229, 0.15);
  --glow-ok: 0 0 14px rgba(5, 150, 105, 0.12);
}

/* ── Reset & Base ───────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg-base);
  background-image:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(124, 92, 255, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 5%, rgba(78, 180, 255, 0.14) 0%, transparent 55%),
    radial-gradient(ellipse 50% 60% at 50% 100%, rgba(94, 234, 212, 0.06) 0%, transparent 70%);
  background-attachment: fixed;
  min-height: 100vh;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

body[data-theme="light"] {
  background-image:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(99, 102, 241, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 5%, rgba(79, 209, 255, 0.08) 0%, transparent 55%);
}

p, li {
  text-wrap: pretty;
}

a {
  color: var(--accent);
}

/* ── Skip Link ──────────────────────────────────── */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 9999;
  transform: translateY(-200%);
  background: var(--surface-strong);
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 8px 18px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition);
  box-shadow: var(--shadow);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ── Shell Layout ───────────────────────────────── */
.shell {
  width: min(calc(100% - 36px), var(--shell));
  margin: 0 auto;
}

/* ── App Shell Lock ─────────────────────────────── */
.app-shell.is-locked {
  filter: blur(10px) brightness(0.7);
  pointer-events: none;
  user-select: none;
  transform: scale(0.99);
  transition: filter var(--transition-slow), transform var(--transition-slow);
}

/* ── Auth Gate ──────────────────────────────────── */
.auth-gate {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(4, 6, 18, 0.7);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
}

.auth-gate.is-hidden {
  display: none;
}

.auth-card {
  width: min(420px, 100%);
  background: var(--surface-strong);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-lg), var(--glow-accent);
  animation: auth-in 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes auth-in {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-kicker {
  margin: 0 0 4px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.7rem;
  font-weight: 700;
}

.auth-card h2 {
  margin: 0 0 8px;
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--text), var(--muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-card > p {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-card label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.auth-card input {
  width: 100%;
  min-height: 48px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  padding: 12px 16px;
  font-size: 0.95rem;
  font-family: var(--font);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  margin-bottom: 16px;
}

.auth-card input:focus {
  border-color: var(--accent-strong);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.2);
}

.auth-card button[type="submit"] {
  width: 100%;
  min-height: 48px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  font-family: var(--font);
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  box-shadow: 0 4px 20px rgba(124, 92, 255, 0.4);
}

.auth-card button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(124, 92, 255, 0.5);
}

.auth-card button[type="submit"]:active {
  transform: translateY(0);
}

.auth-error {
  margin-top: 12px;
  min-height: 20px;
  color: var(--danger);
  font-size: 0.875rem;
  font-weight: 500;
}

/* ── Hero ───────────────────────────────────────── */
.hero {
  padding: 56px 0 0;
}

.hero__inner {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 40px 44px 36px;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.hero__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(124, 92, 255, 0.06) 0%,
    transparent 50%,
    rgba(78, 180, 255, 0.04) 100%);
  pointer-events: none;
}

.hero__inner::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    rgba(124, 92, 255, 0.5),
    rgba(78, 203, 255, 0.5),
    transparent);
}

/* ── Typography ──────────────────────────────────── */
.eyebrow,
.section-kicker,
.stat-card__label,
.timeline-card__meta {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  font-weight: 700;
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.2;
  font-weight: 800;
}

h1 {
  margin-top: 14px;
  font-size: clamp(1.9rem, 4.5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 10%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-heading h2 {
  margin-top: 10px;
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin: 16px 0 0;
}

.hero__lead {
  margin: 16px 0 0;
  color: var(--muted);
  max-width: 800px;
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ── Theme FAB ──────────────────────────────────── */
.theme-fab {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--surface-strong);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-sm);
}

.theme-fab:hover {
  transform: rotate(20deg) scale(1.08);
  box-shadow: var(--shadow), var(--glow-accent);
  border-color: var(--line-strong);
}

.theme-fab__icon {
  font-size: 1rem;
  line-height: 1;
  transition: transform var(--transition);
}

/* ── Hero Stats ─────────────────────────────────── */
.hero__stats {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.05), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm), var(--glow-accent);
}

.stat-card:hover::before {
  opacity: 1;
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.4;
}

/* ── Page Tabs ──────────────────────────────────── */
.page-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 28px 0 0;
  padding-bottom: 2px;
}

.page-tab {
  border: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  border-radius: 999px;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 9px 20px;
  min-height: 40px;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition),
              background var(--transition), color var(--transition), box-shadow var(--transition);
  letter-spacing: 0.01em;
}

.page-tab:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  color: var(--text);
}

.page-tab.is-active {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.18), rgba(78, 203, 255, 0.15));
  border-color: rgba(124, 92, 255, 0.5);
  color: var(--text);
  box-shadow: 0 0 16px rgba(124, 92, 255, 0.2);
}

.page-panel {
  margin-top: 4px;
}

/* ── Section Layout ─────────────────────────────── */
.section {
  padding: 60px 0 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
  align-items: end;
  margin-bottom: 24px;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ── Card Base ─────────────────────────────────── */
.info-card,
.method-card,
.timeline-card,
.model-card,
.table-block,
.callout,
.doc-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.info-card:hover,
.method-card:hover,
.timeline-card:hover,
.model-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow), var(--glow-accent);
}

/* ── Grid Layouts ──────────────────────────────── */
.grid {
  display: grid;
  gap: 14px;
}

.grid--summary,
.grid--methods,
.model-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* ── Info / Method / Model / Doc Card Padding ────── */
.info-card,
.method-card,
.timeline-card,
.model-card,
.callout {
  padding: 22px 24px;
}

.doc-card {
  padding: 24px 26px;
}

/* ── Card Lists ─────────────────────────────────── */
.info-card ul,
.timeline-card ul,
.method-card ol,
.model-card ul,
.doc-card ul,
.doc-card ol,
.doc-ol {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.doc-ol {
  margin: 14px 0 0;
  padding-left: 24px;
}

.doc-ol > li {
  margin: 14px 0;
}

.info-card li,
.timeline-card li,
.method-card li,
.model-card li,
.doc-card li {
  margin: 7px 0;
  font-size: 0.9rem;
}

/* ── Doc Structure Card ─────────────────────────── */
.doc-structure {
  display: grid;
  gap: 14px;
  margin-top: 12px;
  padding-top: 24px;
}

.doc-card h4 {
  margin: 16px 0 0;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-warm);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

/* ── Callout ────────────────────────────────────── */
.callout {
  margin-top: 16px;
  background: linear-gradient(135deg,
    rgba(124, 92, 255, 0.12) 0%,
    rgba(78, 203, 255, 0.1) 100%);
  border-color: rgba(124, 92, 255, 0.25);
  font-size: 0.92rem;
}

.callout strong {
  color: var(--accent-warm);
}

/* ── Timeline ───────────────────────────────────── */
.timeline {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 28px;
  right: 28px;
  height: 2px;
  background: linear-gradient(90deg,
    var(--accent-strong), var(--accent), var(--ok));
  opacity: 0.3;
  z-index: 0;
  border-radius: 2px;
}

.timeline-card {
  padding: 20px 18px;
  position: relative;
  z-index: 1;
}

.timeline-card__meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.18), rgba(78, 180, 255, 0.15));
  border: 1px solid rgba(124, 92, 255, 0.3);
  border-radius: 999px;
  padding: 3px 10px;
  margin-bottom: 12px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.timeline-card h3 {
  font-size: 0.95rem;
  margin-bottom: 2px;
}

/* ── Method Card Priority ───────────────────────── */
.method-card--priority {
  background: linear-gradient(160deg,
    rgba(124, 92, 255, 0.12),
    rgba(78, 203, 255, 0.06));
  border-color: rgba(124, 92, 255, 0.3);
}

.method-card--priority:hover {
  box-shadow: var(--shadow), 0 0 28px rgba(124, 92, 255, 0.2);
}

.method-card ol {
  counter-reset: method-counter;
  list-style: none;
  padding-left: 0;
}

.method-card ol li {
  counter-increment: method-counter;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 4px 0;
}

.method-card ol li::before {
  content: counter(method-counter);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 3px;
}

/* ── Download Strip ─────────────────────────────── */
.download-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 24px;
}

.download-strip button {
  border: 1px solid var(--line);
  color: var(--text-secondary);
  background: var(--surface);
  border-radius: var(--radius-md);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 10px 12px;
  min-height: 44px;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition),
              background var(--transition), color var(--transition), box-shadow var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.download-strip button::before {
  content: "↓";
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  transition: transform var(--transition);
}

.download-strip button:hover {
  transform: translateY(-2px);
  border-color: rgba(124, 92, 255, 0.4);
  background: rgba(124, 92, 255, 0.08);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.download-strip button:hover::before {
  transform: translateY(2px);
}

.download-strip button:active {
  transform: translateY(0);
}

/* ── Tables ─────────────────────────────────────── */
.table-block {
  margin-bottom: 16px;
  overflow: hidden;
}

.table-block__heading {
  padding: 20px 22px 0;
  margin-bottom: 4px;
}

.table-block__heading h3 {
  margin-bottom: 4px;
}

.table-block__heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.table-wrap {
  overflow-x: auto;
  margin: 12px 0 0;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid var(--line);
}

.table-wrap::-webkit-scrollbar {
  height: 4px;
}

.table-wrap::-webkit-scrollbar-track {
  background: transparent;
}

.table-wrap::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}

table {
  width: 100%;
  min-width: 830px;
  border-collapse: collapse;
}

th,
td {
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  font-size: 0.865rem;
}

th {
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(124, 92, 255, 0.05);
  white-space: nowrap;
}

tbody td {
  color: var(--text-secondary);
}

tr:last-child td {
  border-bottom: none;
}

tbody tr {
  transition: background var(--transition);
}

tbody tr:hover {
  background: rgba(124, 92, 255, 0.04);
}

/* ── Floating Menu ─────────────────────────────── */
.floating-menu {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 30;
}

.floating-menu__toggle {
  width: 54px;
  height: 54px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: var(--shadow), 0 0 28px rgba(124, 92, 255, 0.4);
  position: relative;
  z-index: 2;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.floating-menu__toggle:hover {
  transform: scale(1.08) rotate(-5deg);
  box-shadow: var(--shadow-lg), 0 0 36px rgba(124, 92, 255, 0.5);
}

.floating-menu__toggle svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: opacity var(--transition), transform var(--transition);
}

.floating-menu__toggle .icon-menu { opacity: 1; position: absolute; }
.floating-menu__toggle .icon-close { opacity: 0; position: absolute; transform: rotate(-90deg); }

.floating-menu.is-open .floating-menu__toggle .icon-menu {
  opacity: 0;
  transform: rotate(90deg);
}
.floating-menu.is-open .floating-menu__toggle .icon-close {
  opacity: 1;
  transform: rotate(0deg);
}

.floating-menu__panel {
  position: absolute;
  right: 0;
  bottom: 66px;
  width: min(260px, calc(100vw - 40px));
  border: 1px solid var(--line-strong);
  background: var(--surface-strong);
  border-radius: var(--radius-lg);
  padding: 12px;
  display: grid;
  gap: 8px;
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  box-shadow: var(--shadow-lg);

  opacity: 0;
  transform: translateY(12px) scale(0.95);
  transform-origin: bottom right;
  pointer-events: none;
  visibility: hidden;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.floating-menu.is-open .floating-menu__panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  visibility: visible;
}

.floating-menu__group {
  display: grid;
  gap: 2px;
}

.floating-menu__title {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 10px 4px;
}

.floating-menu__panel a {
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), padding-left var(--transition);
  display: block;
}

.floating-menu__panel a:hover {
  background: rgba(124, 92, 255, 0.1);
  color: var(--text);
  padding-left: 14px;
}

/* ── Footer ─────────────────────────────────────── */
.footer {
  padding: 40px 0 72px;
  margin-top: 20px;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.footer__inner p {
  margin: 0;
}

/* ── Back To Top ────────────────────────────────── */
.backtotop {
  border: 1px solid var(--line);
  color: var(--text-secondary);
  background: var(--surface);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 8px 18px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: transform var(--transition), border-color var(--transition),
              background var(--transition), box-shadow var(--transition);
}

.backtotop::before {
  content: "↑";
  font-weight: 700;
}

.backtotop:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
  color: var(--text);
}

/* ── Focus Visible ─────────────────────────────── */
.download-strip button:focus-visible,
.backtotop:focus-visible,
.page-tab:focus-visible,
.theme-fab:focus-visible,
.floating-menu__toggle:focus-visible,
.auth-card button:focus-visible,
.auth-card input:focus-visible {
  outline: 2px solid var(--ok);
  outline-offset: 3px;
}

/* ── Responsive ─────────────────────────────────── */
@media (max-width: 1080px) {
  .hero__stats,
  .section-heading,
  .grid--summary,
  .grid--methods,
  .model-grid {
    grid-template-columns: 1fr;
  }

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

  .timeline::before {
    display: none;
  }

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

@media (max-width: 720px) {
  .shell {
    width: min(calc(100% - 24px), var(--shell));
  }

  .hero {
    padding-top: 32px;
  }

  .hero__inner {
    padding: 28px 22px;
    border-radius: var(--radius-lg);
  }

  .section {
    padding-top: 44px;
  }

  .info-card,
  .method-card,
  .timeline-card,
  .model-card,
  .callout,
  .doc-card {
    padding: 18px 18px;
    border-radius: var(--radius-lg);
  }

  .table-block__heading {
    padding: 16px 16px 0;
  }

  .timeline {
    grid-template-columns: 1fr;
  }

  .download-strip {
    grid-template-columns: 1fr;
  }

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

  .theme-fab {
    top: 14px;
    right: 14px;
    width: 38px;
    height: 38px;
  }

  .floating-menu {
    right: 14px;
    bottom: 14px;
  }

  table {
    min-width: 680px;
  }

  .page-tab {
    font-size: 0.82rem;
    padding: 8px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}