/* ==========================================================================
   Xinmerce · V1 官网首页 UI 交付稿
   纯静态：HTML + CSS + 少量 JavaScript。无后端、无接口调用。
   视觉基准：1440px 桌面端优先，向下兼容平板与手机。
   ========================================================================== */

:root {
  /* 品牌色（与 design system 对齐） */
  --brand: #2B5BFF;
  --brand-hover: #1E47E0;
  --brand-light: #EAF0FF;
  --brand-soft: #F4F7FF;

  /* 文字 */
  --ink: #0F1F3D;
  --ink-soft: #3A4A66;
  --muted: #6B7A90;
  --muted-2: #8A98AE;

  /* 线条与底色 */
  --border: #E6EAF3;
  --border-strong: #D8DFEC;
  --surface: #FFFFFF;

  /* 阴影（克制） */
  --shadow-xs: 0 2px 10px rgba(21, 42, 86, .05);
  --shadow-sm: 0 6px 20px rgba(21, 42, 86, .06);
  --shadow: 0 14px 34px rgba(21, 42, 86, .10);
  --shadow-lg: 0 24px 60px rgba(21, 42, 86, .14);
  --ring: 0 0 0 3px rgba(43, 91, 255, .30);

  --radius-xl: 24px;
  --radius-lg: 20px;
  --radius: 16px;
  --radius-sm: 12px;

  --header-h: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-hand: "Segoe Script", "Bradley Hand", "Comic Sans MS", cursive;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--surface);
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; }

h1, h2, h3, p, ul, figure { margin: 0; }
ul { padding: 0; list-style: none; }
a { color: inherit; }
button { font-family: inherit; }

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
}

section { scroll-margin-top: calc(var(--header-h) + 16px); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 10px 16px;
  background: var(--brand);
  color: #fff;
  border-radius: 0 0 10px 0;
  font-size: 14px;
}
.skip-link:focus { left: 0; }

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

/* ==========================================================================
   通用按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .18s ease, background-color .2s ease, border-color .2s ease,
    color .2s ease, box-shadow .2s ease;
}
.btn:active { transform: translateY(1px) scale(.995); }

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 8px 20px rgba(43, 91, 255, .26);
}
.btn-primary:hover {
  background: var(--brand-hover);
  box-shadow: 0 12px 26px rgba(43, 91, 255, .32);
  transform: translateY(-1px);
}

.btn-outline {
  background: #fff;
  border-color: var(--border-strong);
  color: var(--ink);
}
.btn-outline:hover {
  border-color: #C7D7FF;
  background: var(--brand-soft);
  color: var(--brand);
  transform: translateY(-1px);
}

.btn-ghost {
  background: #fff;
  border-color: var(--border);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: #C7D7FF;
  color: var(--brand);
}

.btn-lg {
  height: 48px;
  padding: 0 26px;
  font-size: 15px;
  border-radius: 14px;
}
.btn-block { width: 100%; }

/* ==========================================================================
   A. 顶部导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.site-header.is-stuck {
  border-bottom-color: var(--border);
  box-shadow: 0 4px 22px rgba(21, 42, 86, .06);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex: 0 0 auto;
}
.brand-mark { display: block; }
.brand-name {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
}

.main-nav { margin: 0 auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 38px;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  transition: color .2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--brand);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .24s ease;
}
.nav-link:hover { color: var(--brand); }
.nav-link:hover::after,
.nav-link.is-active::after { transform: scaleX(1); }
.nav-link.is-active { color: var(--brand); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 语言切换 */
.lang-switch { position: relative; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 38px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: #445a7d;
  font-size: 14px;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease;
}
.lang-btn:hover { background: var(--brand-soft); color: var(--brand); }
.lang-btn[aria-expanded="true"] { background: var(--brand-soft); color: var(--brand); }

.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 168px;
  padding: 6px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  z-index: 70;
}
.lang-menu:not([hidden]) { display: block; animation: pop .16s ease; }
@keyframes pop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}
.lang-option {
  display: block;
  width: 100%;
  padding: 9px 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  text-align: left;
  font-size: 14px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background-color .16s ease, color .16s ease;
}
.lang-option:hover { background: var(--brand-soft); color: var(--brand); }
.lang-option.is-active { color: var(--brand); font-weight: 600; background: var(--brand-light); }

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  place-items: center;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 3px auto;
  border-radius: 2px;
  background: var(--ink);
  transition: transform .24s ease, opacity .18s ease;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.nav-extra { display: none; }

/* ==========================================================================
   B. Hero 首屏
   ========================================================================== */
.hero {
  position: relative;
  padding: 30px 0 26px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(920px 520px at 76% -6%, rgba(226, 236, 255, .95) 0%, rgba(226, 236, 255, 0) 62%),
    radial-gradient(760px 460px at 2% 6%, rgba(244, 247, 255, .95) 0%, rgba(244, 247, 255, 0) 66%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.26fr);
  gap: 44px;
  align-items: center;
  /* 只覆盖纵向内边距，保留 .container 的左右留白 */
  padding-block: 42px 54px;
}

.hero-title {
  font-size: clamp(38px, 4.1vw, 58px);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--ink);
}
.hero-title-accent { color: var(--brand); }

.hero-sub {
  margin-top: 20px;
  font-size: 16.5px;
  line-height: 1.7;
  color: #56688A;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin-top: 42px;
  font-size: 14.5px;
  color: #445a7d;
}
.hero-points li {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 0 22px;
  border-left: 1px solid var(--border);
}
.hero-points li:first-child { padding-left: 0; border-left: 0; }

/* Hero 右侧组合视觉 */
.hero-visual {
  --vs: .92;
  position: relative;
  display: grid;
  grid-template-columns:
    calc(122px * var(--vs)) calc(36px * var(--vs)) calc(210px * var(--vs))
    calc(32px * var(--vs)) minmax(0, 1fr);
  align-items: center;
  gap: calc(6px * var(--vs));
  min-height: calc(400px * var(--vs));
  padding: calc(14px * var(--vs)) 0 calc(46px * var(--vs));
}

.hero-glow {
  position: absolute;
  inset: -14% -10%;
  background: radial-gradient(closest-side, rgba(43, 91, 255, .13), rgba(43, 91, 255, 0) 72%);
  pointer-events: none;
}

.hero-globe {
  position: absolute;
  top: calc(-92px * var(--vs));
  right: calc(-116px * var(--vs));
  width: calc(560px * var(--vs));
  height: auto;
  opacity: .55;
  pointer-events: none;
  user-select: none;
}

.hv-card {
  position: relative;
  z-index: 1;
  background: #fff;
  border: 1px solid #E9EDF6;
  border-radius: calc(14px * var(--vs));
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform .28s cubic-bezier(.22, .61, .36, 1), box-shadow .28s ease;
}
.hv-card:hover {
  transform: translateY(calc(-4px * var(--vs)));
  box-shadow: var(--shadow);
}

.hv-card-head {
  display: flex;
  align-items: center;
  gap: calc(5px * var(--vs));
  padding: calc(7px * var(--vs)) calc(9px * var(--vs));
  font-size: calc(10.5px * var(--vs));
  font-weight: 600;
  color: #25324A;
}
.hv-card-head img { width: calc(14px * var(--vs)); height: calc(14px * var(--vs)); }

.hv-card-media { position: relative; }
.hv-card-media img { display: block; width: 100%; height: auto; }

.hv-card-foot {
  padding: calc(6px * var(--vs)) calc(9px * var(--vs));
  border-top: 1px solid #F1F4FA;
  font-size: calc(9.5px * var(--vs));
  color: var(--muted-2);
}

.hv-card-poster { padding: calc(8px * var(--vs)) calc(12px * var(--vs)) calc(12px * var(--vs)); }
.hv-card-poster strong {
  display: block;
  font-family: Georgia, "Times New Roman", serif;
  font-size: calc(12.5px * var(--vs));
  font-weight: 600;
  line-height: 1.4;
  color: #1C2B45;
}
.hv-card-poster span {
  display: block;
  margin-top: calc(3px * var(--vs));
  font-size: calc(9.5px * var(--vs));
  color: #9AA6B8;
  letter-spacing: .02em;
}

.hv-play {
  position: absolute;
  left: 50%;
  top: 50%;
  display: grid;
  place-items: center;
  width: calc(34px * var(--vs));
  height: calc(34px * var(--vs));
  padding: 0;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(255, 255, 255, .8);
  border-radius: 50%;
  background: rgba(22, 38, 66, .26);
  backdrop-filter: blur(2px);
  cursor: pointer;
  transition: background-color .2s ease, transform .2s ease;
}
.hv-play img { width: calc(15px * var(--vs)); height: calc(15px * var(--vs)); }
.hv-play:hover {
  background: rgba(43, 91, 255, .78);
  transform: translate(-50%, -50%) scale(1.08);
}

.hv-arrow {
  width: calc(36px * var(--vs));
  height: auto;
  margin-top: calc(26px * var(--vs));
  justify-self: center;
  opacity: .95;
}

.hv-right {
  display: grid;
  grid-template-columns: calc(122px * var(--vs)) minmax(0, 1fr);
  align-items: center;
  gap: calc(12px * var(--vs));
  min-width: 0;
}

.hv-badges {
  display: grid;
  gap: calc(10px * var(--vs));
  align-content: center;
}
.hv-badge {
  display: flex;
  align-items: center;
  gap: calc(8px * var(--vs));
  padding: calc(7px * var(--vs)) calc(11px * var(--vs));
  background: #fff;
  border: 1px solid #E7ECF7;
  border-radius: calc(12px * var(--vs));
  box-shadow: 0 6px 16px rgba(21, 42, 86, .06);
  font-size: calc(12px * var(--vs));
  color: #3A4A66;
  white-space: nowrap;
}
.hv-badge img { width: calc(18px * var(--vs)); height: calc(18px * var(--vs)); }
.hv-badge em { font-style: normal; color: #9AA8BE; }
.hv-badge strong { font-weight: 600; color: #16213A; }

.hv-note {
  position: absolute;
  right: calc(-2px * var(--vs));
  bottom: calc(8px * var(--vs));
  z-index: 2;
  font-family: var(--font-hand);
  font-size: calc(14px * var(--vs));
  line-height: 1.5;
  color: #4A6FB5;
  transform: rotate(-5deg);
  text-align: center;
}
.hv-note::after {
  content: "";
  position: absolute;
  left: 6%;
  right: -4%;
  bottom: calc(-4px * var(--vs));
  height: calc(12px * var(--vs));
  border-bottom: 2px solid rgba(74, 111, 181, .45);
  border-radius: 50%;
}

/* ==========================================================================
   C. 三个核心能力
   ========================================================================== */
.capabilities { padding: 14px 0 8px; }
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.cap-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  text-decoration: none;
  transition: transform .24s cubic-bezier(.22, .61, .36, 1), box-shadow .24s ease, border-color .24s ease;
}
.cap-card:hover {
  transform: translateY(-3px);
  border-color: #CFDCFF;
  box-shadow: var(--shadow);
}
.cap-icon {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--brand-light);
}
.cap-body { display: flex; flex-direction: column; gap: 3px; }
.cap-body strong { font-size: 16.5px; font-weight: 600; color: var(--ink); }
.cap-body span { font-size: 13.5px; color: var(--muted); line-height: 1.5; }
.cap-chevron { margin-left: auto; opacity: .8; transition: transform .2s ease; }
.cap-card:hover .cap-chevron { transform: translateX(3px); }

/* ==========================================================================
   D. 功能展示区
   ========================================================================== */
.features { padding: 62px 0 78px; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 {
  font-size: clamp(26px, 2.35vw, 34px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}
.section-head p {
  margin-top: 14px;
  font-size: 15px;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.feature-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: transform .24s cubic-bezier(.22, .61, .36, 1), box-shadow .24s ease, border-color .24s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: #D9E3FA;
  box-shadow: var(--shadow);
}
.feature-head { display: flex; align-items: center; gap: 10px; }
.feature-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  background: var(--brand-light);
}
.feature-head h3 { font-size: 17px; font-weight: 600; color: var(--ink); }
.feature-desc { font-size: 13.5px; color: var(--muted); line-height: 1.6; min-height: 44px; }

.feature-visual {
  overflow: hidden;
  border: 1px solid #EEF1F8;
  border-radius: 14px;
  background: #F7F9FD;
}
.feature-visual img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.feature-visual--script {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 3 / 2;
  background: linear-gradient(150deg, #FAFBFF 0%, #EFF4FE 100%);
}
.script-card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  width: 84%;
  padding: 14px;
  background: #fff;
  border: 1px solid #E7ECF7;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(21, 42, 86, .06);
}
.script-platforms { display: flex; gap: 8px; margin-bottom: 3px; }
.script-line {
  display: block;
  height: 7px;
  border-radius: 4px;
  background: #EDF1F9;
}
.script-line--lg { width: 78%; background: #E2EAF9; }
.script-line--sm { width: 56%; }

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: auto;
  padding-top: 4px;
}
.feature-list li {
  position: relative;
  padding-left: 17px;
  font-size: 13.5px;
  color: var(--ink-soft);
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brand);
}

/* ==========================================================================
   E. CTA
   ========================================================================== */
.cta { padding: 0 0 78px; }
.cta-band {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 30px 40px;
  border: 1px solid #DEE8FF;
  border-radius: var(--radius-xl);
  background: linear-gradient(104deg, #E9F1FF 0%, #F5F8FF 52%, #E7F0FF 100%);
}
.cta-band::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -110px;
  width: 430px;
  height: 300px;
  background: radial-gradient(closest-side, rgba(43, 91, 255, .16), rgba(43, 91, 255, 0));
  pointer-events: none;
}
.cta-band > * { position: relative; z-index: 1; }
.cta-globe { flex: 0 0 auto; width: 88px; height: 88px; }
.cta-copy h2 {
  font-size: clamp(22px, 2.1vw, 29px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}
.cta-copy p { margin-top: 8px; font-size: 14.5px; color: #55668A; }
.cta-btn { margin-left: auto; }
.cta-note {
  font-family: var(--font-hand);
  font-size: 15px;
  line-height: 1.5;
  color: #4A6FB5;
  transform: rotate(-5deg);
  text-align: center;
}

/* ==========================================================================
   F. Footer
   ========================================================================== */
.site-footer {
  padding: 42px 0 30px;
  border-top: 1px solid var(--border);
  background: #fff;
}
.footer-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 32px;
}
.footer-brand p { margin-top: 8px; font-size: 13px; color: var(--muted); }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 26px;
  font-size: 14px;
}
.footer-links a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color .2s ease;
}
.footer-links a:hover { color: var(--brand); }
.footer-social { display: flex; align-items: center; gap: 6px; }
.footer-social a {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  opacity: .88;
  transition: opacity .2s ease, background-color .2s ease, transform .2s ease;
}
.footer-social a:hover {
  opacity: 1;
  background: var(--brand-soft);
  transform: translateY(-1px);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid #F0F3F9;
  font-size: 12.5px;
  color: var(--muted-2);
}

/* ==========================================================================
   交互反馈：Toast（演示用）
   ========================================================================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 90;
  max-width: calc(100vw - 40px);
  padding: 12px 22px;
  border-radius: 12px;
  background: rgba(15, 31, 61, .94);
  box-shadow: 0 16px 40px rgba(15, 31, 61, .28);
  color: #fff;
  font-size: 14px;
  text-align: center;
  opacity: 0;
  transform: translate(-50%, 14px);
  transition: opacity .24s ease, transform .24s ease;
  pointer-events: none;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ==========================================================================
   进场动画（仅在 JS 可用时启用）
   ========================================================================== */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.22, .61, .36, 1);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .hv-card:hover, .cap-card:hover, .feature-card:hover, .btn-primary:hover, .btn-outline:hover {
    transform: none;
  }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1240px) {
  .hero-visual { --vs: .84; }
  .hero-points { margin-top: 34px; }
}

@media (max-width: 1140px) {
  .nav-list { gap: 28px; }
  .hero-inner { gap: 32px; }
}

/* 平板：Hero 改为上下结构 */
@media (max-width: 1080px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 30px;
  }
  .hero-copy { max-width: 640px; }
  .hero-visual {
    --vs: .95;
    max-width: 760px;
    margin: 0 auto;
    width: 100%;
  }
  .hero-sub { max-width: 34em; }
  .cap-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* 小屏平板：导航收进菜单，功能卡片两列 */
@media (max-width: 980px) {
  .cap-grid { grid-template-columns: minmax(0, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    gap: 22px;
  }
  .footer-brand { display: flex; flex-direction: column; align-items: center; }
  .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
}

@media (max-width: 900px) {
  .nav-toggle { display: grid; }
  .main-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    margin: 0;
    padding: 14px 28px 22px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 18px 40px rgba(21, 42, 86, .10);
    display: none;
  }
  .main-nav.is-open { display: block; animation: pop .18s ease; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav-link {
    display: block;
    padding: 12px 4px;
    font-size: 16px;
    border-bottom: 1px solid #F2F5FA;
  }
  .nav-link::after { display: none; }
  .nav-extra {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
  }
  .nav-extra-lang {
    font-size: 13px;
    color: var(--muted);
    text-align: center;
  }
  .hero-visual { --vs: .84; }
  .cta-band {
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
    padding: 28px 26px;
  }
  .cta-copy { text-align: left; }
  .cta-btn { margin-left: 0; }
  .cta-note { width: 100%; }
}

/* 手机：Hero 组合视觉改为紧凑网格 */
@media (max-width: 760px) {
  .container { padding: 0 20px; }
  .hero { padding-top: 12px; }
  .hero-inner { padding-block: 24px 40px; gap: 26px; }
  .hero-ctas { margin-top: 24px; }

  .hero-visual {
    --vs: 1;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    min-height: 0;
    max-width: 460px;
    padding: 0;
  }
  .hero-glow { inset: -8% 0; }
  .hero-globe {
    width: 300px;
    top: -70px;
    right: -110px;
    opacity: .35;
  }
  .hv-arrow { display: none; }
  .hv-right { display: contents; }
  .hv-card--enhanced { order: 1; grid-column: 1 / -1; width: 100%; max-width: 262px; margin: 0 auto; }
  .hv-card--video { order: 2; }
  .hv-card--original { order: 3; }
  .hv-badges {
    order: 4;
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }
  .hv-note {
    position: static;
    order: 5;
    grid-column: 1 / -1;
    margin-top: 6px;
    transform: rotate(-3deg);
  }
  .hv-card-media--original img,
  .hv-card-media--video img { aspect-ratio: 1 / 1; object-fit: cover; }
  .hv-card--enhanced .hv-card-media img { aspect-ratio: 1 / 1; object-fit: cover; }

  .cta-band { padding: 26px 20px; }
  .cta-copy h2 { font-size: 22px; }
  .cta-copy { text-align: center; }
  .cta-globe { width: 72px; height: 72px; }
}

/* 窄手机 */
@media (max-width: 620px) {
  .brand-name { font-size: 20px; }
  .lang-switch { display: none; }
  .header-actions .btn-ghost { display: none; }
  .feature-grid { grid-template-columns: minmax(0, 1fr); }
  .hero-ctas .btn { flex: 1 1 160px; }
  .hero-points { margin-top: 26px; font-size: 13.5px; }
  .hero-points li { padding: 0 14px; }
  .section-head h2 { font-size: 24px; }
  .features { padding: 46px 0 60px; }
  .cta { padding-bottom: 58px; }
  .footer-links { gap: 10px 18px; font-size: 13.5px; }
}