/* ===========================================================
   格译 Geyi · 国内跳转站落地页样式(GEYI-886)
   纯静态,无框架、无外部字体、无 CDN 依赖。
   =========================================================== */

:root {
  /* 品牌色取自 immersive_translator_frontend/src/index.css 的浅色主题 token,
     深橙 #D14109 与文字色 #2D3340 取自 public/geyi.png 的实际像素 */
  --primary: #c2652a;
  --primary-deep: #d14109;
  --primary-soft: #fbeee5;
  --ink: #2d3340;
  --ink-soft: #5c626e;
  --ink-mute: #8a8f99;
  --bg: #f7f5f2;
  --bg-alt: #f1ede7;
  --surface: #ffffff;
  --line: #e5dfd7;
  --line-soft: #efeae3;
  --radius: 10px;
  --radius-lg: 18px;
  --wrap: 1120px;

  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "Heiti SC",
    sans-serif;
  --font-en: Georgia, "Times New Roman", "Songti SC", serif;

  color-scheme: light;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶栏 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 245, 242, 0.88);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--line-soft);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 24px;
}

.brand img {
  height: 22px;
  width: auto;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav {
  display: flex;
  gap: 28px;
  font-size: 15px;
  color: var(--ink-soft);
}

.site-nav a {
  position: relative;
  padding: 4px 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--primary-deep);
  transform: scaleX(0);
  transform-origin: left center;
}

.site-nav a:hover {
  color: var(--primary-deep);
}

.site-nav a:hover::after {
  transform: scaleX(1);
}

/* 顶栏主色小按钮:放在 .site-nav 之外,窄屏隐藏导航时仍然保留 */
.btn-nav {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.btn-nav:hover {
  background: var(--primary-deep);
}

/* ---------- 通用小标签 ---------- */

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  font-size: 12px;
  color: var(--ink-mute);
}

.eyebrow-en {
  font-family: var(--font-en);
  letter-spacing: 0.18em;
  color: var(--primary-deep);
}

.eyebrow-cn {
  position: relative;
  padding-left: 13px;
  letter-spacing: 0.08em;
}

.eyebrow-cn::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1px;
  height: 12px;
  margin-top: -6px;
  background: var(--line);
}

/* ---------- Hero ---------- */

.hero {
  padding: 84px 0 96px;
  background: linear-gradient(180deg, #fdfbf8 0%, var(--bg) 62%);
  border-bottom: 1px solid var(--line-soft);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  align-items: center;
  gap: 64px;
}

.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.15rem);
  line-height: 1.28;
}

.lede {
  margin-top: 22px;
  max-width: 34em;
  font-size: 17px;
  color: var(--ink-soft);
}

.section-lede {
  margin-top: 16px;
  max-width: 42em;
  font-size: 16px;
  color: var(--ink-soft);
}

/* hero 主 CTA */
.cta-block {
  margin-top: 34px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 6px 18px rgba(194, 101, 42, 0.22);
}

.btn-primary:hover {
  background: var(--primary-deep);
  box-shadow: 0 10px 24px rgba(209, 65, 9, 0.26);
}

/* 描边次级按钮:工作机制区块的行内 CTA 与 Zotero 条右侧的视觉按钮共用 */
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  background: transparent;
  color: var(--primary-deep);
  font-size: 15px;
  font-weight: 600;
}

.btn-ghost:hover,
.strip:hover .btn-ghost {
  background: var(--primary-soft);
}

.cta-inline {
  margin-top: 44px;
  text-align: center;
}

/* 箭头单独成 span,便于 hover 时单独位移 */
.arrow {
  display: inline-block;
  font-family: var(--font-en);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 26px;
  font-size: 14px;
  color: var(--ink-soft);
}

.trust-row li {
  position: relative;
  padding-left: 16px;
}

.trust-row li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.6;
}

.disclaimer {
  margin-top: 30px;
  max-width: 40em;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ink-mute);
}

/* ---------- Hero 纯 CSS 示意图 ---------- */

.hero-visual {
  display: flex;
  justify-content: center;
}

.doc-card {
  display: block;
  position: relative;
  width: 100%;
  max-width: 440px;
  padding: 18px 18px 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: 0 18px 44px rgba(45, 51, 64, 0.08);
}

.doc-card:hover {
  border-color: var(--primary);
  box-shadow: 0 26px 56px rgba(45, 51, 64, 0.13);
}

/* 整卡可点时右下角浮现的小角标 */
.card-cue {
  position: absolute;
  right: 20px;
  bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--primary-deep);
  opacity: 0;
}

.card:hover .card-cue,
.card:focus-visible .card-cue,
.doc-card:hover .card-cue,
.doc-card:focus-visible .card-cue {
  opacity: 1;
}

.doc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 12px;
  color: var(--ink-mute);
}

.doc-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-deep);
  letter-spacing: 0.04em;
}

.doc-page {
  font-family: var(--font-en);
}

.doc-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding-top: 18px;
}

.doc-col--zh {
  position: relative;
  overflow: hidden;
  padding-left: 18px;
  border-left: 1px dashed var(--line);
}

.doc-title {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.doc-title--en {
  font-family: var(--font-en);
}

.doc-title--zh {
  color: var(--primary-deep);
}

.doc-text {
  margin: 0 0 10px;
  font-size: 10.5px;
  line-height: 1.65;
  color: var(--ink-mute);
  text-align: justify;
}

.doc-text--en {
  font-family: var(--font-en);
}

.doc-figure {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 62px;
  margin: 16px 0;
  border: 1px dashed var(--line);
  border-radius: 6px;
  background: #faf8f5;
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--ink-mute);
}

/* ---------- 通用区块 ---------- */

.section {
  padding: 88px 0;
}

.section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.section-title {
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
}

/* ---------- 三个特性卡 ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.card {
  display: block;
  position: relative;
  padding: 32px 28px 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.card:hover {
  border-color: var(--primary);
  box-shadow: 0 18px 38px rgba(45, 51, 64, 0.12);
}

.card .card-cue {
  right: 28px;
  bottom: 18px;
}

.card h3 {
  position: relative;
  padding-top: 18px;
  font-size: 19px;
}

.card h3::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 3px;
  border-radius: 2px;
  background: var(--primary);
}

.card p {
  margin-top: 14px;
  font-size: 15px;
  color: var(--ink-soft);
}

/* ---------- 品牌叙事 ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 56px;
}

.about-head .section-title {
  max-width: 20em;
}

.belief-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  padding-top: 8px;
}

.belief-list li {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.belief-list h3 {
  font-size: 17px;
}

.belief-list p {
  margin-top: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}

/* ---------- 分层机制 01/02/03 ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 52px;
}

.step {
  padding: 34px 28px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.step:hover {
  border-color: var(--primary);
  box-shadow: 0 18px 38px rgba(45, 51, 64, 0.12);
}

.step-no {
  display: block;
  font-family: var(--font-en);
  font-size: 34px;
  line-height: 1;
  font-style: italic;
  color: var(--primary);
  opacity: 0.5;
}

.step h3 {
  margin-top: 18px;
  font-size: 19px;
}

.step p {
  margin-top: 14px;
  font-size: 15px;
  color: var(--ink-soft);
}

/* ---------- Zotero 条 ---------- */

.section--strip {
  padding-top: 0;
}

.strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 40px 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, #fdf7f1 0%, var(--surface) 70%);
}

.strip:hover {
  border-color: var(--primary);
  box-shadow: 0 18px 38px rgba(45, 51, 64, 0.1);
}

.strip-side {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: 16px;
}

.strip-copy h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
}

.strip-copy p {
  margin-top: 14px;
  max-width: 46em;
  font-size: 15px;
  color: var(--ink-soft);
}

.strip-mark {
  flex-shrink: 0;
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-en);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--primary-deep);
}

/* ---------- 页脚 ---------- */

/* 底部留白要够高:页面滚到底时,右下角悬浮胶囊不能压住备案号那一行 */
.site-footer {
  padding: 64px 0 96px;
  background: #ffffff;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 40px;
}

.footer-logo {
  display: inline-block;
}

.footer-brand img {
  height: 22px;
  width: auto;
}

.footer-brand p {
  margin-top: 18px;
  max-width: 26em;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-links h3 {
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--ink);
}

.footer-links a:hover {
  color: var(--primary-deep);
}

.footer-cta {
  color: var(--primary-deep);
  font-weight: 600;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--ink-mute);
}

.footer-disclaimer {
  max-width: 44em;
}

.footer-legal {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 18px;
  white-space: nowrap;
}

.footer-legal a:hover {
  color: var(--primary-deep);
}

/* ---------- 右下角悬浮 CTA ---------- */

.float-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 10px 26px rgba(194, 101, 42, 0.3);
}

.float-cta:hover {
  background: var(--primary-deep);
}

/* 无 JS 时常驻显示;有 JS 时先隐藏,滚过 hero 再由 IntersectionObserver 放出来 */
.js .float-cta {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(10px);
}

.js .float-cta.is-shown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}

/* ---------- 键盘焦点 ---------- */

a:focus-visible {
  outline: 2px solid var(--primary-deep);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .hero {
    padding: 64px 0 72px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
  }

  .hero-visual {
    order: 2;
  }

  .cards,
  .steps,
  .belief-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .strip {
    flex-direction: column;
    align-items: flex-start;
    padding: 34px 30px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .wrap {
    padding: 0 20px;
  }

  .site-nav {
    display: none;
  }

  .header-inner {
    min-height: 56px;
  }

  .hero {
    padding: 48px 0 60px;
  }

  .hero h1 {
    line-height: 1.34;
  }

  .lede {
    margin-top: 18px;
    font-size: 15.5px;
  }

  .btn-primary {
    width: 100%;
    justify-content: center;
    padding: 15px 24px;
  }

  .section {
    padding: 60px 0;
  }

  .cards,
  .steps,
  .belief-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .belief-list li {
    padding-top: 20px;
  }

  .belief-list br,
  .hero h1 br {
    display: none;
  }

  .card,
  .step {
    padding: 26px 22px;
  }

  .doc-card {
    padding: 14px;
  }

  .doc-body {
    gap: 12px;
  }

  .doc-col--zh {
    padding-left: 12px;
  }

  .footer-grid {
    flex-direction: column;
    gap: 32px;
  }

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

  .footer-legal {
    white-space: normal;
  }

  .header-right {
    gap: 0;
  }

  .btn-nav {
    padding: 7px 15px;
    font-size: 13.5px;
  }

  .cta-inline {
    margin-top: 32px;
  }

  .btn-ghost {
    padding: 11px 18px;
    font-size: 14px;
  }

  .strip-side {
    gap: 12px;
  }

  .float-cta {
    right: 16px;
    bottom: 16px;
    padding: 10px 18px;
    font-size: 13px;
  }

  .site-footer {
    padding-bottom: 78px;
  }
}

/* ===========================================================
   动效:全部收在 prefers-reduced-motion: no-preference 之下,
   只动 transform / opacity / box-shadow(不触发重排)。
   =========================================================== */

@media (prefers-reduced-motion: no-preference) {
  /* ---- 悬浮:卡片上浮 + 阴影加深 + 描边转主色 ---- */

  .card,
  .doc-card,
  .step,
  .strip {
    transition: transform 0.25s ease, box-shadow 0.25s ease,
      border-color 0.25s ease;
  }

  .card:hover,
  .card:focus-visible,
  .doc-card:hover,
  .doc-card:focus-visible,
  .step:hover,
  .strip:hover,
  .strip:focus-visible {
    transform: translateY(-4px);
  }

  /* ---- 悬浮:整卡角标浮现 ---- */

  .card-cue {
    transform: translateY(4px);
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  .card:hover .card-cue,
  .card:focus-visible .card-cue,
  .doc-card:hover .card-cue,
  .doc-card:focus-visible .card-cue {
    transform: none;
  }

  /* ---- 悬浮:按钮与箭头 ---- */

  .btn-primary,
  .btn-nav,
  .btn-ghost,
  .float-cta {
    transition: background 0.2s ease, transform 0.25s ease,
      box-shadow 0.25s ease;
  }

  .btn-primary:hover,
  .btn-primary:focus-visible,
  .btn-nav:hover,
  .btn-nav:focus-visible,
  .float-cta:hover {
    transform: translateY(-1px);
  }

  .arrow {
    transition: transform 0.25s ease;
  }

  a:hover .arrow,
  a:focus-visible .arrow {
    transform: translateX(4px);
  }

  /* ---- 悬浮:导航下划线从左滑入 ---- */

  .site-nav a,
  .footer-links a,
  .footer-legal a {
    transition: color 0.18s ease;
  }

  .site-nav a::after {
    transition: transform 0.25s ease;
  }

  /* ---- 悬浮:logo 轻微放大 ---- */

  .brand img,
  .footer-logo img {
    transition: transform 0.25s ease;
  }

  .brand:hover img,
  .brand:focus-visible img,
  .footer-logo:hover img,
  .footer-logo:focus-visible img {
    transform: scale(1.03);
  }

  /* ---- 自动:hero 文案错峰入场 ---- */

  .hero-copy .eyebrow,
  .hero-copy h1,
  .hero-copy .lede,
  .hero-copy .cta-block,
  .hero-copy .trust-row {
    animation: geyi-fade-up 0.5s ease both;
  }

  .hero-copy h1 {
    animation-delay: 0.08s;
  }

  .hero-copy .lede {
    animation-delay: 0.16s;
  }

  .hero-copy .cta-block {
    animation-delay: 0.24s;
  }

  .hero-copy .trust-row {
    animation-delay: 0.32s;
  }

  /* ---- 自动:示意卡轻浮动(动画挂外层,避免和整卡 hover 位移打架) ---- */

  .hero-visual {
    animation: geyi-float 6s ease-in-out infinite;
  }

  /* ---- 自动:译文栏自上而下扫光,模拟「翻译进行中」 ---- */

  .doc-col--zh::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 56%;
    pointer-events: none;
    background: linear-gradient(
      180deg,
      rgba(194, 101, 42, 0) 0%,
      rgba(194, 101, 42, 0.16) 50%,
      rgba(194, 101, 42, 0) 100%
    );
    transform: translateY(-110%);
    animation: geyi-shimmer 5s ease-in-out infinite;
  }

  /* ---- 自动:Zotero 字标呼吸 ---- */

  .strip-mark {
    animation: geyi-breathe 4s ease-in-out infinite;
  }

  /* ---- 滚动显现:初始态只在 .js 下生效,无 JS 时页面完整可见 ---- */

  .js [data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.55s ease, transform 0.55s ease;
  }

  .js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }

  /* ---- 悬浮胶囊淡入 ---- */

  .js .float-cta {
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease,
      background 0.2s ease;
  }

  @keyframes geyi-fade-up {
    from {
      opacity: 0;
      transform: translateY(16px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }

  @keyframes geyi-float {
    0%,
    100% {
      transform: translateY(-6px);
    }
    50% {
      transform: translateY(6px);
    }
  }

  @keyframes geyi-shimmer {
    0% {
      transform: translateY(-110%);
    }
    55%,
    100% {
      transform: translateY(230%);
    }
  }

  @keyframes geyi-breathe {
    0%,
    100% {
      opacity: 0.6;
    }
    50% {
      opacity: 1;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}