/* ==========================================================
   MinerU Online — Design System v2  (brand-grade)
   ========================================================== */

:root {
  /* ---- Ink scale (cool-tinted neutrals) ---- */
  --ink-950: oklch(11% 0.014 205);
  --ink-900: oklch(15% 0.016 205);
  --ink-850: oklch(18% 0.016 205);
  --ink-800: oklch(22% 0.016 205);
  --ink-700: oklch(29% 0.015 205);
  --ink-600: oklch(40% 0.014 205);
  --ink-500: oklch(52% 0.013 205);
  --ink-400: oklch(65% 0.012 205);
  --ink-300: oklch(80% 0.01 205);
  --ink-200: oklch(90% 0.008 205);
  --ink-150: oklch(94% 0.006 205);
  --ink-100: oklch(96.5% 0.005 205);
  --ink-50: oklch(98.5% 0.003 205);

  /* ---- Brand: teal ---- */
  --teal-100: oklch(95% 0.035 190);
  --teal-200: oklch(89% 0.06 190);
  --teal-300: oklch(80% 0.09 190);
  --teal-400: oklch(70% 0.12 190);
  --teal-500: oklch(58% 0.13 190);
  --teal-600: oklch(49% 0.12 190);
  --teal-700: oklch(40% 0.10 190);
  --teal-900: oklch(24% 0.05 190);

  /* ---- Accent: amber (small-area only) ---- */
  --amber-300: oklch(86% 0.09 78);
  --amber-400: oklch(80% 0.13 75);
  --amber-500: oklch(72% 0.15 70);

  /* ---- Semantic ---- */
  --success-500: oklch(66% 0.13 158);
  --success-600: oklch(56% 0.12 158);
  --error-500: oklch(62% 0.16 25);

  /* ---- Semantic tokens ---- */
  --color-primary: var(--teal-500);
  --color-primary-hover: var(--teal-600);
  --color-primary-bright: var(--teal-400);
  --color-accent: var(--amber-400);

  --color-text: var(--ink-700);
  --color-text-muted: var(--ink-500);
  --color-text-heading: var(--ink-900);
  --color-surface: #ffffff;
  --color-paper: var(--ink-50);
  --color-border: var(--ink-200);
  --color-border-strong: var(--ink-300);

  /* ---- Typography ---- */
  --font-display: "Instrument Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Instrument Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Instrument Serif", "Songti SC", Georgia, serif;
  --font-mono: "Geist Mono", "SF Mono", "Menlo", "Consolas", monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-5xl: 3.75rem;
  --text-6xl: 4.5rem;

  --leading-none: 1.04;
  --leading-tight: 1.16;
  --leading-snug: 1.35;
  --leading-normal: 1.62;

  /* ---- Spacing (4pt base) ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ---- Layout ---- */
  --container-max: 76rem;
  --gutter: var(--space-6);
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;

  /* ---- Motion ---- */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out-quint: cubic-bezier(0.83, 0, 0.17, 1);

  /* ---- Elevation ---- */
  --shadow-xs: 0 1px 2px oklch(20% 0.02 205 / 0.05);
  --shadow-sm: 0 2px 6px oklch(20% 0.02 205 / 0.06), 0 1px 2px oklch(20% 0.02 205 / 0.04);
  --shadow-md: 0 10px 24px -6px oklch(20% 0.02 205 / 0.10), 0 2px 6px oklch(20% 0.02 205 / 0.05);
  --shadow-lg: 0 28px 60px -18px oklch(20% 0.02 205 / 0.20), 0 8px 20px -8px oklch(20% 0.02 205 / 0.10);
  --shadow-brand: 0 18px 44px -14px oklch(50% 0.13 190 / 0.42);
}

/* ==========================================================
   Reset
   ========================================================== */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-kerning: normal;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 640;
  line-height: var(--leading-tight);
  letter-spacing: -0.022em;
  color: var(--color-text-heading);
}

a { color: var(--color-primary); text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; }
ul { padding: 0; }
table { border-collapse: collapse; }

::selection {
  background: var(--teal-200);
  color: var(--ink-900);
}

/* ==========================================================
   Utilities
   ========================================================== */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed; top: -100%; left: var(--space-4); z-index: 999;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary); color: #fff;
  border-radius: var(--radius-md); font-weight: 600; font-size: var(--text-sm);
}
.skip-link:focus { top: var(--space-4); }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--space-24); }
.section[id] { scroll-margin-top: 5rem; }

/* ==========================================================
   Header — transparent over dark hero, solid on scroll
   ========================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 320ms var(--ease-out-quart),
              border-color 320ms var(--ease-out-quart),
              backdrop-filter 320ms var(--ease-out-quart);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom-color: var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 4.25rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  color: #fff;
  transition: color 320ms var(--ease-out-quart);
}

.site-header.is-scrolled .logo { color: var(--color-text-heading); }

.logo-mark {
  width: 1.875rem; height: 1.875rem;
  flex-shrink: 0;
}

.logo-badge {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: 999px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
  letter-spacing: 0;
  transition: all 320ms var(--ease-out-quart);
}

.site-header.is-scrolled .logo-badge {
  background: var(--teal-100);
  border-color: var(--teal-200);
  color: var(--teal-700);
}

.main-nav { display: flex; align-items: center; gap: var(--space-1); }

.main-nav a {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 520;
  color: rgba(255, 255, 255, 0.86);
  border-radius: var(--radius-md);
  transition: color 200ms var(--ease-out-quart), background-color 200ms var(--ease-out-quart);
}

.main-nav a:hover { color: #fff; background: rgba(255,255,255,0.08); }

.site-header.is-scrolled .main-nav a { color: var(--color-text-muted); }
.site-header.is-scrolled .main-nav a:hover {
  color: var(--color-text-heading);
  background: var(--ink-100);
}

.header-actions { display: flex; align-items: center; gap: var(--space-3); }

/* ---- Locale / language switcher ---- */
.locale { position: relative; }

.locale-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4375rem;
  height: 2.125rem;
  padding: 0 0.5625rem 0 0.6875rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.88);
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 520;
  cursor: pointer;
  transition:
    background-color 180ms var(--ease-out-quart),
    border-color 180ms var(--ease-out-quart),
    color 180ms var(--ease-out-quart);
}

.locale-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}

.locale-btn:focus-visible { outline: 2px solid var(--teal-400); outline-offset: 2px; }

.locale-globe { width: 1rem; height: 1rem; flex: none; opacity: 0.85; }

.locale-caret {
  width: 0.875rem; height: 0.875rem;
  flex: none;
  opacity: 0.6;
  transition: transform 220ms var(--ease-out-quart);
}

.locale.is-open .locale-caret { transform: rotate(180deg); }
.locale.is-open .locale-btn {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.34);
  color: #fff;
}

.site-header.is-scrolled .locale-btn {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}
.site-header.is-scrolled .locale-btn:hover {
  background: var(--ink-50);
  border-color: var(--ink-300);
  color: var(--color-text-heading);
}

.locale-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 70;
  width: 25rem;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  animation: localeIn 160ms var(--ease-out-quart);
}

@keyframes localeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

.locale-menu-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0 var(--space-2) var(--space-2);
  border-bottom: 1px solid var(--ink-150);
  font-size: var(--text-xs);
  font-weight: 620;
  letter-spacing: -0.01em;
  color: var(--color-text-heading);
}

.locale-count { font-weight: 500; color: var(--color-text-muted); }

.locale-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.0625rem;
  padding-top: var(--space-2);
  list-style: none;
}

.locale-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  width: 100%;
  padding: 0.4375rem var(--space-2);
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: var(--color-text);
  transition: background-color 140ms var(--ease-out-quart);
}

.locale-item:hover { background: var(--ink-100); }
.locale-item:focus-visible { outline: 2px solid var(--teal-500); outline-offset: -2px; }

.locale-item.is-current { background: var(--teal-100); color: var(--teal-700); }

.li-native {
  font-size: var(--text-sm);
  font-weight: 560;
  white-space: nowrap;
}

.li-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.locale-item.is-current .li-sub { color: var(--teal-600); }

.li-mark {
  margin-left: auto;
  flex: none;
  min-width: 1rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.125rem 0.25rem;
  border-radius: 3px;
  background: var(--ink-100);
  color: var(--color-text-muted);
}

.locale-item.is-current .li-mark { background: transparent; color: var(--teal-600); }

.locale-foot {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--ink-150);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
}

.mobile-menu .locale { display: block; }
.mobile-menu .locale-btn { width: 100%; justify-content: flex-start; }
.mobile-menu .locale-menu {
  position: static;
  width: 100%;
  margin-top: var(--space-2);
  box-shadow: var(--shadow-md);
  max-height: 60vh;
  overflow-y: auto;
}
.mobile-menu .locale-list { grid-template-columns: 1fr; }

@media (max-width: 420px) {
  .locale-menu { width: min(88vw, 25rem); }
  .locale-list { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .locale-menu { animation: none; }
  .locale-caret { transition: none; }
}

.menu-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 2.5rem; height: 2.5rem;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 320ms var(--ease-out-quart);
}

.site-header.is-scrolled .menu-toggle {
  background: transparent;
  border-color: var(--color-border);
}

.menu-toggle span {
  display: block;
  width: 1rem; height: 1.5px;
  border-radius: 2px;
  background: #fff;
  transition: transform 300ms var(--ease-out-quart), opacity 200ms, background-color 320ms;
}

.site-header.is-scrolled .menu-toggle span { background: var(--color-text-heading); }

.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  inset: 4.25rem 0 0 0;
  z-index: 99;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-6);
  background: var(--ink-950);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.mobile-menu[aria-hidden="false"] { display: flex; }

.mobile-menu nav { display: flex; flex-direction: column; }

.mobile-menu nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  font-size: var(--text-xl);
  font-weight: 560;
  color: rgba(255,255,255,0.92);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.mobile-menu nav a::after {
  content: "→";
  color: var(--teal-400);
  font-size: var(--text-lg);
}

.mobile-cta { width: 100%; }

@media (max-width: 1000px) {
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
}

@media (max-width: 560px) {
  .header-actions .locale { display: none; }
  .mobile-menu .locale { display: block; margin-top: var(--space-6); }
}

/* ==========================================================
   Buttons
   ========================================================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.6875rem var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 620;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 180ms var(--ease-out-quart),
              background-color 180ms var(--ease-out-quart),
              border-color 180ms var(--ease-out-quart),
              color 180ms var(--ease-out-quart),
              box-shadow 180ms var(--ease-out-quart);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.985); }
.btn:focus-visible { outline: 2px solid var(--teal-500); outline-offset: 2px; }

.btn--primary {
  background: var(--teal-500);
  color: #fff;
  box-shadow: 0 1px 2px oklch(40% 0.08 190 / 0.25), inset 0 1px 0 oklch(100% 0 0 / 0.16);
}

.btn--primary:hover {
  background: var(--teal-600);
  color: #fff;
  box-shadow: var(--shadow-brand), inset 0 1px 0 oklch(100% 0 0 / 0.16);
}

.btn--ghost-dark {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.18);
  color: #fff;
  backdrop-filter: blur(8px);
}

.btn--ghost-dark:hover {
  background: rgba(255,255,255,0.13);
  border-color: rgba(255,255,255,0.3);
  color: #fff;
}

.btn--secondary {
  background: var(--color-surface);
  border-color: var(--color-border-strong);
  color: var(--color-text-heading);
  box-shadow: var(--shadow-xs);
}

.btn--secondary:hover {
  background: var(--ink-50);
  border-color: var(--ink-400);
  color: var(--color-text-heading);
}

.btn--lg { padding: 0.875rem var(--space-6); font-size: var(--text-md); border-radius: var(--radius-lg); }
.btn--block { width: 100%; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2rem; height: 2rem; padding: 0;
  border: none; background: transparent;
  color: var(--ink-400);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 150ms, color 150ms;
}
.icon-btn svg { width: 1.0625rem; height: 1.0625rem; }
.icon-btn:hover:not(:disabled) { background: var(--ink-100); color: var(--ink-800); }
.icon-btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ==========================================================
   Hero — dark, editorial, grounded
   ========================================================== */
.hero {
  position: relative;
  padding-block: 6rem 11rem;
  background: var(--ink-950);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

/* grid texture */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 20%, transparent 78%);
  z-index: -2;
}

/* brand glows — soft, not neon */
.hero::after {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 120%;
  background:
    radial-gradient(38rem 30rem at 78% 18%, oklch(50% 0.14 190 / 0.34), transparent 68%),
    radial-gradient(30rem 26rem at 12% 72%, oklch(58% 0.13 235 / 0.22), transparent 70%),
    radial-gradient(22rem 18rem at 92% 82%, oklch(72% 0.13 70 / 0.12), transparent 72%);
  filter: blur(6px);
  z-index: -1;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
  gap: var(--space-16);
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3) var(--space-1) var(--space-2);
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.05);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: rgba(255,255,255,0.86);
  margin-bottom: var(--space-4);
}

.eyebrow-dot {
  width: 0.4375rem; height: 0.4375rem;
  border-radius: 50%;
  background: var(--teal-400);
  box-shadow: 0 0 0 3px oklch(70% 0.12 190 / 0.2);
  animation: breathe 2.6s var(--ease-in-out-quint) infinite;
}

@keyframes breathe {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.86); }
}

.hero-title {
  font-size: clamp(2.25rem, 4.6vw, 3.5rem);
  font-weight: 660;
  line-height: var(--leading-none);
  letter-spacing: -0.035em;
  color: #fff;
  margin-bottom: var(--space-4);
  max-width: 18ch;
}

.hero-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--teal-300);
}

.hero-lead {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: rgba(255,255,255,0.66);
  max-width: 44ch;
  margin-bottom: var(--space-6);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-10);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.hero-stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 660;
  letter-spacing: -0.03em;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.hero-stat-label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.01em;
}

/* Hero visual — parse preview */
.hero-visual { position: relative; }

.preview-window {
  position: relative;
  border-radius: var(--radius-xl);
  background: linear-gradient(165deg, oklch(24% 0.02 205) 0%, oklch(17% 0.018 205) 100%);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow:
    0 40px 80px -30px oklch(0% 0 0 / 0.6),
    0 0 0 1px rgba(255,255,255,0.04),
    inset 0 1px 0 rgba(255,255,255,0.1);
  overflow: hidden;
}

.preview-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
}

.preview-dot { width: 0.5625rem; height: 0.5625rem; border-radius: 50%; }
.preview-dot:nth-child(1) { background: oklch(62% 0.16 25); }
.preview-dot:nth-child(2) { background: oklch(78% 0.13 80); }
.preview-dot:nth-child(3) { background: var(--success-500); }

.preview-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.02em;
}

.preview-body {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  padding: var(--space-4);
}

/* ---- source: scanned PDF page with a chemical structure ---- */
.hero-paper {
  position: relative;
  padding: var(--space-3) var(--space-4) var(--space-3);
  border-radius: var(--radius-md);
  background: linear-gradient(158deg, #fffdf7 0%, #f7f3ea 52%, #eee8db 100%);
  box-shadow:
    0 16px 30px -16px rgba(0, 0, 0, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
  transform: rotate(-0.55deg);
  overflow: hidden;
}

/* paper grain + uneven scan lighting */
.hero-paper::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(115% 75% at 10% -10%, rgba(255,255,255,0.8), transparent 58%),
    radial-gradient(85% 65% at 100% 100%, rgba(118,108,88,0.16), transparent 62%),
    repeating-linear-gradient(0deg, rgba(88,78,58,0.05) 0 1px, transparent 1px 3px);
  mix-blend-mode: multiply;
  opacity: 0.85;
}

.hero-paper-head {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.625rem;
  color: #8b8474;
  padding-bottom: 0.375rem;
  border-bottom: 1px solid rgba(120, 110, 90, 0.2);
  margin-bottom: 0.375rem;
}

.hero-mol {
  position: relative;
  display: block;
  width: auto;
  max-width: 100%;
  height: 8rem;
  margin: 0 auto;
}

.hero-paper-caption {
  position: relative;
  margin-top: 0.125rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.625rem;
  color: #6f6a5d;
  text-align: center;
}

.hero-paper-lines {
  position: relative;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.3125rem;
}

.hero-paper-lines i {
  display: block;
  height: 0.3125rem;
  border-radius: 2px;
  background: rgba(70, 64, 52, 0.14);
}
.hero-paper-lines i:nth-child(2) { width: 86%; }
.hero-paper-lines i:nth-child(3) { width: 58%; }

/* ---- conversion step ---- */
.hero-convert {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-inline: 0.25rem;
}

.hero-convert-icon {
  flex: none;
  width: 1.625rem;
  height: 1.625rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: oklch(72% 0.13 178 / 0.14);
  border: 1px solid oklch(72% 0.13 178 / 0.38);
  color: var(--teal-300);
}
.hero-convert-icon svg { width: 0.8125rem; height: 0.8125rem; }

.hero-convert-text {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.5);
  white-space: nowrap;
}

.hero-convert-rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(255,255,255,0.16), transparent);
}

/* ---- output: Markdown ---- */
.hero-md {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: oklch(13% 0.012 205);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  line-height: 1.8;
  overflow: hidden;
}

.hero-md .md-row {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero-md .md-hl {
  display: block;
  margin-block: 0.125rem;
  padding: 0.0625rem 0.375rem;
  border-left: 2px solid oklch(72% 0.14 178);
  border-radius: 0 3px 3px 0;
  background: oklch(72% 0.14 178 / 0.11);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero-md .hm-h  { color: oklch(83% 0.09 80); }
.hero-md .hm-t  { color: rgba(255, 255, 255, 0.5); }
.hero-md .hm-b  { color: #fff; font-weight: 650; }
.hero-md .hm-k  { color: oklch(80% 0.13 195); }
.hero-md .hm-p  { color: rgba(255, 255, 255, 0.32); }
.hero-md .hm-s  { color: oklch(79% 0.12 158); }
.hero-md .hm-m  { color: oklch(81% 0.1 285); }
.hero-md .hm-c  { color: rgba(255, 255, 255, 0.28); font-style: italic; }

.preview-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.45);
}

.preview-foot strong { color: var(--teal-300); font-weight: 620; }

@media (max-width: 1000px) {
  .hero { padding-block: 5rem 6rem; }
  .hero-inner { grid-template-columns: 1fr; gap: var(--space-12); }
  .hero-title { max-width: none; }
  .hero-stats { gap: var(--space-8); }
}

@media (max-width: 560px) {
  .hero-stats { gap: var(--space-6); }
}

/* ==========================================================
   Workbench — stacked (upload on top, tasks below),
   card breaks the dark/light boundary
   ========================================================== */
.section--workbench {
  position: relative;
  margin-top: -9.5rem;
  padding-block: 0 var(--space-24);
  background: var(--color-surface);
  z-index: 2;
}

.workbench-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: var(--space-20);
  margin-bottom: var(--space-8);
}

.workbench {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.workbench-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-8);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--ink-50) 0%, var(--color-surface) 100%);
}

.workbench-bar-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.wb-live {
  width: 0.5rem; height: 0.5rem;
  border-radius: 50%;
  background: var(--success-500);
  box-shadow: 0 0 0 3px oklch(72% 0.12 158 / 0.22);
  animation: breathe 2.6s var(--ease-in-out-quint) infinite;
  flex-shrink: 0;
}

.workbench-name {
  font-size: var(--text-md);
  font-weight: 660;
  letter-spacing: -0.015em;
  white-space: nowrap;
}

.workbench-note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-600);
  margin-bottom: var(--space-3);
}

.eyebrow::before {
  content: "";
  width: 1.25rem; height: 1px;
  background: var(--teal-500);
}

.section-title {
  font-size: clamp(1.875rem, 3.4vw, 2.625rem);
  font-weight: 650;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.section-lead {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  max-width: 52ch;
}

.section-head-center {
  max-width: 44rem;
  margin-inline: auto;
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-head-center .eyebrow::before { display: none; }
.section-head-center .section-lead { margin-inline: auto; }

/* ---- Upload zone (inside the workbench frame) ---- */
.upload-card {
  position: relative;
  background: var(--color-surface);
}

.upload-card-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6) var(--space-8);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--ink-50) 0%, var(--color-surface) 100%);
}

.upload-tabs { display: flex; gap: var(--space-2); }

.upload-tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all 180ms var(--ease-out-quart);
}

.upload-tab svg { width: 1.0625rem; height: 1.0625rem; }
.upload-tab:hover { color: var(--color-text-heading); background: var(--ink-100); }

.upload-tab.is-active {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}

.upload-card-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.upload-card-body { padding: var(--space-8); }

.upload-panel[hidden] { display: none; }

.dropzone {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: 12rem;
  padding: var(--space-7) var(--space-8);
  border: 1.5px dashed var(--color-border-strong);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(30rem 8rem at 50% 0%, var(--teal-100) 0%, transparent 70%),
    var(--ink-50);
  cursor: pointer;
  transition: border-color 200ms var(--ease-out-quart),
              background-color 200ms var(--ease-out-quart),
              transform 200ms var(--ease-out-quart);
}

.dropzone:hover { border-color: var(--teal-400); transform: translateY(-1px); }

.dropzone.is-dragover {
  border-color: var(--teal-500);
  border-style: solid;
  background: var(--teal-100);
}

.dropzone-icon {
  flex-shrink: 0;
  width: 4.25rem; height: 4.25rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--teal-600);
  box-shadow: var(--shadow-sm);
}

.dropzone-icon svg { width: 2.125rem; height: 2.125rem; }
.dropzone-copy { flex: 1; min-width: 0; }

.dropzone-title {
  font-size: var(--text-xl);
  font-weight: 640;
  color: var(--color-text-heading);
  margin-bottom: var(--space-2);
}

.dropzone-hint { font-size: var(--text-sm); color: var(--color-text-muted); }

.dropzone-formats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.dropzone-formats span {
  padding: 0.1875rem var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-600);
}

.link-form { display: flex; flex-direction: column; gap: var(--space-2); }
.link-form .form-input { padding-block: 1.125rem; font-size: var(--text-md); }
.link-form .input-row { align-items: stretch; }
.form-label {
  font-size: var(--text-sm);
  font-weight: 620;
  color: var(--color-text-heading);
}

.input-row { display: flex; gap: var(--space-2); }

.form-input {
  flex: 1; min-width: 0;
  padding: 0.8125rem var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 180ms, box-shadow 180ms;
}

.form-input::placeholder { color: var(--ink-400); }

.form-input:focus {
  outline: none;
  border-color: var(--teal-500);
  box-shadow: 0 0 0 3.5px var(--teal-100);
}

.form-hint { font-size: var(--text-sm); color: var(--color-text-muted); }

.file-preview { margin-top: var(--space-4); }

.file-preview-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--teal-200);
  background: var(--teal-100);
  border-radius: var(--radius-lg);
}

.file-preview-icon {
  width: 2.5rem; height: 2.5rem;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--teal-700);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.file-preview-meta { flex: 1; min-width: 0; }

.file-preview-name {
  display: block;
  font-weight: 620;
  color: var(--color-text-heading);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-preview-size { font-size: var(--text-sm); color: var(--ink-600); }

.file-preview-remove {
  background: transparent;
  border: none;
  color: var(--ink-600);
  font-size: var(--text-xl);
  line-height: 1;
  cursor: pointer;
  transition: color 150ms;
}
.file-preview-remove:hover { color: var(--error-500); }

/* upload card footer */
.upload-card-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-8);
  border-top: 1px solid var(--color-border);
  background: var(--ink-50);
}

.format-group { display: flex; align-items: center; gap: var(--space-3); }

.format-label {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.chips { display: flex; gap: var(--space-2); }
.chip { position: relative; cursor: pointer; }
.chip input { position: absolute; opacity: 0; width: 0; height: 0; }

.chip span {
  display: inline-block;
  padding: 0.375rem var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  background: var(--color-surface);
  font-size: var(--text-sm);
  font-weight: 560;
  color: var(--color-text-muted);
  transition: all 160ms var(--ease-out-quart);
}

.chip input:checked + span {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}

.chip input:focus-visible + span { outline: 2px solid var(--teal-500); outline-offset: 2px; }

/* ---- Tasks zone (inside the workbench frame) ---- */
.tasks-card {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.tasks-card .tasks-header { background: linear-gradient(180deg, var(--ink-50) 0%, var(--color-surface) 100%); }

.tasks-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6) var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.tasks-title-wrap { display: flex; align-items: center; gap: var(--space-3); }

.tasks-title {
  font-size: var(--text-xl);
  font-weight: 650;
}

.tasks-count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 2px var(--space-2);
  border-radius: 999px;
  background: var(--ink-100);
  color: var(--ink-600);
  font-variant-numeric: tabular-nums;
}

.tasks-filters {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  background: var(--ink-100);
  border-radius: var(--radius-md);
}

.filter-btn {
  padding: 0.375rem var(--space-4);
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 580;
  cursor: pointer;
  transition: all 160ms var(--ease-out-quart);
}

.filter-btn:hover { color: var(--color-text-heading); }

.filter-btn.is-active {
  background: var(--color-surface);
  color: var(--color-text-heading);
  box-shadow: var(--shadow-xs);
}

.tasks-table-wrapper { overflow-x: auto; }

.tasks-table {
  width: 100%;
  min-width: 52rem;
  font-size: var(--text-sm);
}

.tasks-table thead th {
  padding: var(--space-4) var(--space-8);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-500);
  background: var(--ink-50);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.tasks-table td {
  padding: var(--space-5) var(--space-8);
  border-bottom: 1px solid var(--ink-150);
  color: var(--color-text);
  vertical-align: middle;
}

.tasks-table tbody tr { transition: background-color 150ms; }
.tasks-table tbody tr:hover { background: var(--ink-50); }
.tasks-table tbody tr:last-child td { border-bottom: none; }

.cell-name { display: flex; align-items: center; gap: var(--space-3); }

.doc-icon {
  flex-shrink: 0;
  width: 2.625rem; height: 2.625rem;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.doc-icon--pdf { background: oklch(95% 0.045 25); color: oklch(52% 0.16 25); }
.doc-icon--url { background: var(--teal-100); color: var(--teal-700); }
.doc-icon--doc { background: oklch(95% 0.04 250); color: oklch(48% 0.14 250); }

.cell-name-text { display: flex; flex-direction: column; min-width: 0; }

.name-main {
  font-weight: 600;
  color: var(--color-text-heading);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.name-meta { font-size: var(--text-xs); color: var(--ink-500); }

.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 3px var(--space-3) 3px var(--space-2);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 620;
  white-space: nowrap;
}

.status::before {
  content: "";
  width: 0.4375rem; height: 0.4375rem;
  border-radius: 50%;
  flex-shrink: 0;
}

.status--done { background: oklch(96% 0.035 158); color: var(--success-600); }
.status--done::before { background: var(--success-500); }

.status--running { background: var(--teal-100); color: var(--teal-700); }
.status--running::before {
  background: var(--teal-500);
  animation: pulse-dot 1.4s var(--ease-in-out-quint) infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.75); }
}

.cell-action { white-space: nowrap; text-align: right; }
.col-action { text-align: right !important; }

.tasks-empty {
  padding: var(--space-16) var(--space-6);
  text-align: center;
  color: var(--color-text-muted);
}

.tasks-empty strong {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--color-text-heading);
  font-weight: 620;
}

@media (max-width: 720px) {
  .section--workbench { margin-top: -4rem; }
  .workbench-head { padding-top: var(--space-16); }
  .dropzone { flex-direction: column; text-align: center; min-height: 0; padding: var(--space-8) var(--space-5); }
  .dropzone-formats { justify-content: center; }
  .upload-card-body,
  .upload-card-top,
  .upload-card-foot,
  .workbench-bar,
  .tasks-header { padding-inline: var(--space-5); }
  .workbench-note { display: none; }
  .workbar-tabs { width: 100%; }
  .upload-card-foot { flex-direction: column; align-items: stretch; }
  .format-group { justify-content: space-between; }
  .tasks-table thead th,
  .tasks-table td { padding-inline: var(--space-4); }
}

/* ==========================================================
   Section shells
   ========================================================== */
.section--capabilities {
  background: var(--color-paper);
  border-block: 1px solid var(--color-border);
}

.section--api { background: var(--color-surface); }

/* ---- Capabilities ---- */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.capability-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform 260ms var(--ease-out-quart),
              box-shadow 260ms var(--ease-out-quart),
              border-color 260ms var(--ease-out-quart);
}

.capability-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--teal-500), var(--teal-300) 45%, transparent);
  opacity: 0;
  transition: opacity 260ms var(--ease-out-quart);
}

.capability-card:hover {
  transform: translateY(-4px);
  border-color: var(--teal-200);
  box-shadow: var(--shadow-md);
}

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

.capability-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-400);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-6);
}

.capability-icon {
  width: 3rem; height: 3rem;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  background: var(--ink-900);
  color: var(--teal-300);
  margin-bottom: var(--space-5);
}

.capability-icon svg { width: 1.5rem; height: 1.5rem; }

.capability-title {
  font-size: var(--text-xl);
  font-weight: 620;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

.capability-desc {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-6);
  flex: 1;
}

.capability-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.tag {
  padding: 3px var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--ink-50);
  font-size: var(--text-xs);
  font-weight: 560;
  color: var(--ink-600);
}

/* ---- Capability inline figure ---- */
.cap-figure {
  position: relative;
  height: 10rem;
  margin-bottom: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(16rem 8rem at 50% 0%, var(--teal-100) 0%, transparent 70%),
    linear-gradient(180deg, #fff 0%, var(--ink-50) 100%);
  overflow: hidden;
}

.cap-figure svg { display: block; width: 100%; height: 100%; }

.cap-figure-tag {
  position: absolute;
  left: var(--space-3);
  bottom: var(--space-3);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.86);
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.04em;
  color: var(--ink-600);
}

@media (max-width: 900px) { .capability-grid { grid-template-columns: 1fr; } }

/* ==========================================================
   Showcase — real parsing results, before → after
   ========================================================== */
.section--showcase {
  background: var(--color-paper);
  border-top: 1px solid var(--color-border);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.showcase-panel {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 260ms var(--ease-out-quart), transform 260ms var(--ease-out-quart);
}

.showcase-panel:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.showcase-panel--wide { grid-column: 1 / -1; }

.showcase-head {
  padding: var(--space-6) var(--space-6) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.showcase-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal-600);
  margin-bottom: var(--space-2);
}

.showcase-title {
  font-size: var(--text-lg);
  font-weight: 640;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.showcase-desc { font-size: var(--text-sm); color: var(--color-text-muted); }

.showcase-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: var(--space-4);
  padding: var(--space-6);
  background:
    linear-gradient(180deg, var(--ink-50) 0%, var(--color-surface) 100%);
  flex: 1;
}

.showcase-body--stack { grid-template-columns: minmax(0, 1fr); }

.fig {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.fig figcaption {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--ink-50);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-500);
  white-space: nowrap;
}

.fig figcaption::before {
  content: "";
  width: 0.375rem; height: 0.375rem;
  border-radius: 50%;
  background: var(--ink-400);
  flex-shrink: 0;
}

.fig--out figcaption { background: oklch(21% 0.018 205); color: rgba(255,255,255,0.5); border-bottom-color: rgba(255,255,255,0.08); }
.fig--out figcaption::before { background: var(--teal-400); }
.fig--out { background: var(--ink-950); border-color: rgba(255,255,255,0.1); }

.fig-canvas {
  flex: 1;
  display: grid;
  place-items: center;
  padding: var(--space-5);
  min-height: 12.5rem;
  background: #fff;
}

.fig-canvas svg { display: block; width: 100%; height: auto; }

/* rendered math (source side) */
.fig-math {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  font-family: Georgia, "Times New Roman", serif;
  color: #16232a;
}

.eq { font-size: 1.4rem; font-style: italic; line-height: 1.5; text-align: center; }
.eq sub, .eq sup { font-size: 0.56em; font-style: normal; }
.eq sub { vertical-align: sub; }
.eq sup { vertical-align: super; }

.frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  margin: 0 0.25em;
  font-size: 0.85em;
  font-style: normal;
}

.frac > span { padding: 0 0.35em; line-height: 1.2; }
.frac > span:first-child { border-bottom: 1.2px solid currentColor; }

.fig-code {
  flex: 1;
  margin: 0;
  padding: var(--space-5);
  min-height: 12.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.85;
  color: rgba(255,255,255,0.72);
  tab-size: 2;
}

.tok-k { color: oklch(74% 0.13 300); }
.tok-s { color: oklch(82% 0.1 150); }
.tok-n { color: oklch(82% 0.1 75); }
.tok-c { color: rgba(255,255,255,0.32); font-style: italic; }
.tok-l { color: oklch(82% 0.1 195); }
.tok-a { color: oklch(80% 0.13 45); }
.tok-p { color: rgba(255,255,255,0.6); }

.showcase-arrow {
  display: grid;
  place-items: center;
  align-self: center;
  width: 2.5rem; height: 2.5rem;
  border-radius: 50%;
  background: var(--ink-900);
  color: var(--teal-300);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.showcase-arrow svg { width: 1.125rem; height: 1.125rem; }
.showcase-body--stack .showcase-arrow { transform: rotate(90deg); justify-self: center; }

/* ==========================================================
   Scenes — SEO photography
   ========================================================== */
.section--scenes { background: var(--color-surface); }

.scenes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.scene-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 260ms var(--ease-out-quart), transform 260ms var(--ease-out-quart);
}

.scene-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }

.scene-card img {
  display: block;
  width: calc(100% - 1.75rem);
  margin: 0.875rem auto 0;
  aspect-ratio: 16 / 9;
  max-height: 9.5rem;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--ink-100);
}

.scene-body { padding: var(--space-4) var(--space-5) var(--space-5); }

.scene-role {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-600);
  margin-bottom: var(--space-2);
}

.scene-title {
  font-size: var(--text-lg);
  font-weight: 640;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.scene-desc { font-size: var(--text-sm); color: var(--color-text-muted); }

@media (max-width: 900px) { .scenes-grid { grid-template-columns: 1fr; } }

/* on-premise photo */
.private-media {
  margin-top: var(--space-12);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: rgba(255,255,255,0.03);
}

.private-media img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 1;
  max-height: 14rem;
  object-fit: cover;
  object-position: center 40%;
}

.private-media figcaption {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.03);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* ==========================================================
   Lower sections — API / Pricing / Private deployment
   ========================================================== */

/* ---------- shared: pre reset ---------- */
pre { margin: 0; }

/* ---------- API ---------- */
.api-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: var(--space-12);
  align-items: center;
}

.feature-list {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-block: var(--space-6) var(--space-8);
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-snug);
  color: var(--color-text);
}

.feature-list svg {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.1875rem;
  color: var(--teal-500);
}

.code-window {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--ink-950);
  border: 1px solid var(--ink-800);
  box-shadow: var(--shadow-lg);
}

.code-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--ink-900);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-dot {
  width: 0.5625rem;
  height: 0.5625rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}
.code-dot:nth-child(1) { background: oklch(62% 0.16 25); }
.code-dot:nth-child(2) { background: oklch(78% 0.13 80); }
.code-dot:nth-child(3) { background: var(--success-500); }

.code-tabs {
  margin-left: auto;
  display: flex;
  gap: var(--space-1);
}

.code-tab {
  padding: 0.1875rem var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.5);
}

.code-tab.is-active {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.code-window pre {
  padding: var(--space-5);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
  tab-size: 2;
}

.code-window code { font-family: inherit; }

.tok-cm { color: rgba(255, 255, 255, 0.32); font-style: italic; }
.tok-kw { color: oklch(74% 0.13 300); }
.tok-fn { color: oklch(82% 0.1 195); }
.tok-str { color: oklch(82% 0.1 150); }

/* ---------- Pricing ---------- */
.section--pricing {
  background: var(--color-paper);
  border-block: 1px solid var(--color-border);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  max-width: 76rem;
  margin-inline: auto;
}

.pricing-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-7);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: transform 260ms var(--ease-out-quart), box-shadow 260ms var(--ease-out-quart);
}

.pricing-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.pricing-card--featured {
  border-color: var(--teal-300);
  box-shadow: var(--shadow-lg);
}

.pricing-badge {
  position: absolute;
  top: -0.75rem;
  right: var(--space-6);
  padding: 0.25rem var(--space-3);
  border-radius: 999px;
  background: var(--teal-500);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 640;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px oklch(58% 0.13 190 / 0.32);
}

.pricing-name {
  font-size: var(--text-xl);
  font-weight: 640;
  letter-spacing: -0.02em;
  color: var(--color-text-heading);
}

.pricing-desc {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.price-value {
  font-size: clamp(2.25rem, 2.4vw, 2.875rem);
  font-weight: 660;
  letter-spacing: -0.035em;
  line-height: 1.1;
  color: var(--color-text-heading);
}

.price-unit {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.pricing-note {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 560;
  color: var(--teal-600);
}

.pricing-card--featured .pricing-note {
  padding: 0.1875rem var(--space-2);
  display: inline-block;
  border-radius: var(--radius-sm);
  background: var(--teal-100);
  color: var(--teal-700);
}

.pricing-divider {
  height: 1px;
  margin-block: var(--space-6);
  background: var(--color-border);
}

.pricing-features {
  flex: 1;
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-snug);
  color: var(--color-text);
}

/* tick drawn in CSS — crisp at any size, no giant glyphs */
.pricing-features li::before {
  content: "";
  flex-shrink: 0;
  width: 0.4375rem;
  height: 0.8125rem;
  margin-top: 0.3125rem;
  border-right: 2px solid var(--teal-500);
  border-bottom: 2px solid var(--teal-500);
  border-radius: 1px;
  transform: rotate(45deg) translateY(-1px);
}

/* ---------- Private deployment ---------- */
.section--private {
  background: var(--ink-950);
  color: rgba(255, 255, 255, 0.72);
}

.section--private .section-title { color: #fff; }
.section--private .eyebrow { color: var(--teal-300); }
.section--private .section-lead { color: rgba(255, 255, 255, 0.6); }

.private-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--space-12);
  align-items: start;
}

.private-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-block: var(--space-8);
}

.private-stat {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.private-stat-value {
  display: block;
  font-size: var(--text-2xl);
  font-weight: 660;
  letter-spacing: -0.025em;
  color: #fff;
}

.private-stat-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
}

.private-cases {
  padding: var(--space-7);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.cases-title {
  font-size: var(--text-lg);
  font-weight: 620;
  color: #fff;
  margin-bottom: var(--space-5);
}

.case-list {
  list-style: none;
  display: grid;
  gap: var(--space-5);
}

.case-item {
  padding-left: var(--space-4);
  border-left: 2px solid var(--teal-400);
}

.case-org {
  display: block;
  font-size: var(--text-base);
  font-weight: 620;
  color: #fff;
  margin-bottom: var(--space-1);
}

.case-desc {
  display: block;
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: rgba(255, 255, 255, 0.58);
}

/* ---------- Showcase: OCR vs MinerU compare ---------- */
.showcase-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--color-border);
}

.compare-cell {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.compare-cell + .compare-cell { border-left: 1px solid var(--color-border); }

.compare-mark {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 0.6875rem;
  font-weight: 700;
  line-height: 1;
}

.compare-cell--bad { background: oklch(97.5% 0.016 25); }
.compare-cell--bad .compare-mark {
  background: oklch(91% 0.05 25);
  color: oklch(52% 0.16 25);
}

.compare-cell--good { background: oklch(97.5% 0.022 190); }
.compare-cell--good .compare-mark {
  background: var(--teal-100);
  color: var(--teal-600);
}

.compare-label {
  display: block;
  font-weight: 640;
  color: var(--color-text-heading);
  margin-bottom: 0.125rem;
}

.compare-text { color: var(--color-text-muted); }

/* ---------- Scanned-paper look for "original PDF" figures ---------- */
.scan-page {
  position: relative;
  padding: var(--space-5) var(--space-6);
  border-radius: 2px;
  background-color: #f7f4ec;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.28'/%3E%3C/svg%3E"),
    linear-gradient(196deg, #fbf9f4 0%, #f4f0e6 52%, #ece7da 100%);
  box-shadow:
    inset 0 0 42px oklch(62% 0.03 85 / 0.16),
    0 1px 0 #fff,
    0 2px 10px oklch(35% 0.02 205 / 0.08);
  filter: grayscale(0.12) contrast(1.03);
  transform: rotate(-0.6deg);
}

.scan-page::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(120% 80% at 18% 8%, rgba(255, 255, 255, 0.5), transparent 62%),
              radial-gradient(90% 70% at 92% 96%, oklch(40% 0.03 80 / 0.12), transparent 60%);
}

.fig-canvas--scan { padding: var(--space-2); }

.scan-page img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
  border-radius: 1px;
}

.hero-mol { object-fit: contain; }

.scan-jitter { display: inline-block; }

.fig--source .fig-canvas svg,
.fig--source .fig-math { color: #2a2f30; }

.cap-figure--paper {
  background-color: #f7f4ec;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.22'/%3E%3C/svg%3E"),
    linear-gradient(196deg, #fbf9f4 0%, #f3efe5 100%);
  filter: grayscale(0.1) contrast(1.02);
}

/* ---------- Misc ---------- */
.btn-delete:hover { color: var(--error-500); border-color: var(--error-500); }
.locale-current { white-space: nowrap; }
.hero-content { min-width: 0; }

@media (max-width: 1080px) {
  .api-layout { grid-template-columns: 1fr; gap: var(--space-8); }
  .private-layout { grid-template-columns: 1fr; gap: var(--space-10); }
  .pricing-grid { grid-template-columns: 1fr; max-width: 32rem; }
}

@media (max-width: 720px) {
  .private-stats { grid-template-columns: 1fr; }
  .private-cases { padding: var(--space-5); }
  .showcase-compare { grid-template-columns: 1fr; }
  .compare-cell + .compare-cell {
    border-left: 0;
    border-top: 1px solid var(--color-border);
  }
  .pricing-card { padding: var(--space-6); }
  .pricing-badge { right: var(--space-6); }
}

@media (prefers-reduced-motion: reduce) {
  .pricing-card:hover { transform: none; }
}

/* ==========================================================
   Footer
   ========================================================== */
.site-footer {
  padding-block: var(--space-16) var(--space-8);
  background: var(--ink-950);
  color: rgba(255,255,255,0.55);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 0.8fr));
  gap: var(--space-10);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo { color: #fff; }

.footer-tagline {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.45);
  max-width: 30ch;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-4);
}

.footer-col ul { list-style: none; display: grid; gap: var(--space-3); }

.footer-col a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.72);
  transition: color 160ms;
}

.footer-col a:hover { color: var(--teal-300); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-6);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.38);
}

.footer-langs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-langs a {
  color: rgba(255,255,255,0.72);
  text-decoration: none;
  transition: color 160ms;
}

.footer-langs a:hover { color: var(--teal-300); }

.footer-langs a[aria-current="page"] { color: rgba(255,255,255,0.45); }

@media (max-width: 760px) {
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* ==========================================================
   Toast
   ========================================================== */
.toast {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  z-index: 300;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: min(24rem, calc(100vw - 2rem));
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--ink-900);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 520;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(0.75rem) scale(0.98);
  pointer-events: none;
  transition: opacity 240ms var(--ease-out-quart), transform 240ms var(--ease-out-quart);
}

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

.toast::before {
  content: "";
  flex-shrink: 0;
  width: 0.4375rem; height: 0.4375rem;
  border-radius: 50%;
  background: var(--teal-400);
  box-shadow: 0 0 0 3px oklch(70% 0.12 190 / 0.18);
}

@media (max-width: 560px) {
  .toast { right: var(--space-4); left: var(--space-4); bottom: var(--space-4); }
}

/* ==========================================================
   Reveal
   ========================================================== */
.reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 700ms var(--ease-out-expo), transform 700ms var(--ease-out-expo);
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ==========================================================
   Locale refinement
   Chinese has no true italic — avoid faux-oblique serif,
   use weight + colour instead. Latin keeps the serif italic.
   ========================================================== */
html:lang(zh) .hero-title em {
  font-family: inherit;
  font-style: normal;
  font-weight: 660;
  color: var(--teal-300);
}

html:lang(zh) .hero-title {
  letter-spacing: -0.02em;
  line-height: 1.14;
} 

/* ==========================================================
   Language hint bar
   首次访问时按浏览器语言给出切换建议，可切换或关闭
   ========================================================== */
.lang-hint {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 250;
  background: var(--ink-900);
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.lang-hint-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  min-height: 3rem;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.lang-hint-text {
  flex: 1 1 16rem;
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.88);
}

.lang-hint-action {
  flex: 0 0 auto;
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 520;
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.lang-hint-close {
  flex: 0 0 auto;
  margin-inline-start: auto;
  padding: 0 0.25rem;
  border: 0;
  background: transparent;
  color: rgba(255,255,255,0.7);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}

.lang-hint-close:hover { color: #fff; }

body.has-lang-hint { padding-top: var(--lang-hint-h, 0px); }
body.has-lang-hint .site-header { top: var(--lang-hint-h, 0px); }

@media (max-width: 560px) {
  .lang-hint-text { flex-basis: 100%; }
  .lang-hint-close { margin-inline-start: 0; }
}

/* ==========================================================
   RTL（阿拉伯语）
   flex / grid 会跟随 direction 自动镜像，这里只补物理属性偏差
   ========================================================== */
[dir="rtl"] .lang-hint-close { margin-inline-start: 0; margin-inline-end: auto; }

[dir="rtl"] .skip-link:focus { left: auto; right: var(--space-4); }

/* ==========================================================
   多语言：语言包应用前隐藏正文
   页面正文写死中文，非中文访客由 JS 替换文案；这段时间先不显示，
   避免闪一下中文。只有命中非中文语言时 head 内联脚本才会挂上该属性，
   中文访客完全不受影响；脚本加载失败时内联脚本会摘掉该属性兜底。
   ========================================================== */
html[data-i18n-pending] body { visibility: hidden; }