/* ============================================================
   Vistaplus Co Ltd - DOOH Display Solutions 官网
   纯静态，无构建依赖，直接上传阿里云 OSS 即可
   ============================================================ */

/* ---------- 1. 设计变量（品牌：黑 + 荧光绿） ---------- */
:root {
  --brand: #67c12c;
  --brand-dark: #4fa020;
  --brand-light: #f0fbe6;
  --accent: #67c12c;
  --ink: #0c1014;
  --ink-2: #3d444d;
  --ink-3: #6b7480;
  --line: #e5e8ec;
  --bg: #ffffff;
  --bg-soft: #f6f8f6;
  --dark: #0c1014;
  --dark-2: #161c22;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .06);
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .12);
  --max: 1200px;
  --header-h: 88px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 .6em;
  color: var(--ink);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -.01em;
}
h1 { font-size: clamp(2rem, 4.4vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; }

a {
  color: var(--brand);
  text-decoration: none;
  transition: color .2s var(--ease);
}
a:hover { color: var(--brand-dark); }

img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }

ul { margin: 0; padding-left: 1.2em; }

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 3. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: 24px;
}
.section { padding: clamp(56px, 8vw, 104px) 0; }
.section--soft { background: var(--bg-soft); }
.section--ink {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: #cbd5e1;
}
.section--ink h2, .section--ink h3 { color: #fff; }

.section-head {
  max-width: 720px;
  margin: 0 auto clamp(36px, 5vw, 56px);
  text-align: center;
}
.section-head p { color: var(--ink-3); font-size: 1.05rem; margin: 0; }
.section--ink .section-head p { color: #94a3b8; }

.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 12px;
}
.section--ink .eyebrow { color: var(--accent); }

.grid { display: grid; gap: 28px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s var(--ease);
  white-space: nowrap;
}
.btn--primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 8px 20px rgba(37, 99, 235, .28);
}
.btn--primary:hover {
  background: var(--brand-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(37, 99, 235, .34);
}
.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, .45);
  color: #fff;
}
.btn--ghost:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.btn--outline {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}
.btn--outline:hover { border-color: var(--brand); color: var(--brand); }
.btn--block { width: 100%; }

/* ---------- 5. 顶部导航 ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -.02em;
}
.logo:hover { color: var(--ink); }
.logo__mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), #7c3aed);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: .95rem;
  font-weight: 800;
}
.logo__sub {
  font-size: .68rem;
  font-weight: 500;
  color: var(--ink-3);
  letter-spacing: .14em;
  display: block;
  line-height: 1;
  margin-top: 2px;
}

.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--ink-2);
}
.nav a:hover { background: var(--brand-light); color: var(--brand); }
.nav a.is-active { color: var(--brand); font-weight: 700; }

.header__cta { display: flex; align-items: center; gap: 12px; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  padding: 0;
  place-items: center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all .25s var(--ease);
}
.nav-toggle span::before,
.nav-toggle span::after { content: ""; position: absolute; }
.nav-toggle span::before { transform: translateY(-6px); }
.nav-toggle span::after  { transform: translateY(6px); }
.nav-toggle.is-open span { background: transparent; }
.nav-toggle.is-open span::before { transform: rotate(45deg); }
.nav-toggle.is-open span::after  { transform: rotate(-45deg); }

/* ---------- 6. 首页 Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 10vw, 128px) 0 clamp(56px, 8vw, 96px);
  background:
    radial-gradient(1000px 500px at 85% -10%, #dbeafe 0%, transparent 60%),
    radial-gradient(800px 460px at 5% 10%, #ede9fe 0%, transparent 55%),
    #fff;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.hero h1 { margin-bottom: 20px; }
.hero h1 em {
  font-style: normal;
  color: var(--brand);
  position: relative;
}
.hero__lead {
  font-size: 1.1rem;
  color: var(--ink-3);
  max-width: 52ch;
  margin-bottom: 32px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 48px);
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.hero__stats b {
  display: block;
  font-size: 1.85rem;
  color: var(--ink);
  line-height: 1.2;
}
.hero__stats span { font-size: .85rem; color: var(--ink-3); }

.hero__visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, #dbeafe, #ede9fe);
  aspect-ratio: 4 / 3;
}
.hero__visual img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }

/* ---------- 7. 卡片 ---------- */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all .3s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.card__icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  background: var(--brand-light);
  color: var(--brand);
  margin-bottom: 18px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--ink-3); margin: 0; font-size: .95rem; }

.card--media {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card--media img { border-radius: 0; aspect-ratio: 16 / 10; object-fit: cover; }
.card--media .card__body { padding: 22px 24px 26px; }

/* application cards on the homepage: photo on top, text below */
.card--app {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card--app img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 0;
}
.card--app .card__body { padding: 22px 24px 26px; }
/* .section--ink forces h3 white for headings on the dark background, but these
   cards are white, so give the titles their normal dark colour back */
.card--app h3 { color: #0f172a; }
.card__tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  color: var(--brand);
  background: var(--brand-light);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.card__meta {
  font-size: .82rem;
  color: var(--ink-3);
  margin: 0;
}

/* ---------- 8. 数据条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stats__item b {
  display: block;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  color: #fff;
  line-height: 1.2;
}
.stats__item span { font-size: .88rem; color: #94a3b8; }

/* ---------- 9. 列表 / 时间线 ---------- */
.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 12px;
  color: var(--ink-2);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--brand);
  font-weight: 800;
}

.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}
.timeline__item { position: relative; padding-bottom: 30px; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--brand);
}
.timeline__year {
  font-size: .82rem;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: .06em;
}
.timeline__item p { margin: 4px 0 0; font-size: .95rem; color: var(--ink-3); }

/* ---------- 10. 表单 ---------- */
.form { display: grid; gap: 16px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 6px; }
.field label { font-size: .88rem; font-weight: 600; color: var(--ink); }
.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: .95rem;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
  width: 100%;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}
.form__note { font-size: .82rem; color: var(--ink-3); margin: 0; }

/* ---------- 11. 联系信息块 ---------- */
.contact-block {
  display: flex;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.contact-block__icon {
  flex: 0 0 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--brand-light);
  color: var(--brand);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
}
.contact-block h4 { margin: 0 0 4px; font-size: 1rem; }
.contact-block p { margin: 0; font-size: .92rem; color: var(--ink-3); }

.map-placeholder {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(45deg, #f1f5f9 0 12px, #f8fafc 12px 24px);
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  color: var(--ink-3);
  font-size: .9rem;
  text-align: center;
  padding: 20px;
}

/* ---------- 12. CTA 条 ---------- */
.cta-bar {
  background: linear-gradient(120deg, var(--brand), #7c3aed);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(36px, 5vw, 60px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.cta-bar h2 { color: #fff; margin: 0 0 6px; }
.cta-bar p { margin: 0; color: rgba(255, 255, 255, .85); }

/* ---------- 13. 页脚 ---------- */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: clamp(48px, 6vw, 72px) 0 0;
  font-size: .92rem;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 44px;
}
.footer h4 {
  color: #fff;
  font-size: .95rem;
  margin-bottom: 16px;
  letter-spacing: .02em;
}
.footer a { color: #94a3b8; }
.footer a:hover { color: #fff; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 10px; }
.footer .logo { color: #fff; margin-bottom: 14px; }
.footer .logo:hover { color: #fff; }
/* transparent white wordmark, straight on the dark footer */
.footer .logo img { height: 40px; width: auto; }
.footer__about { max-width: 34ch; }

/* ---------- 13c. 锚点跳转补偿（吸顶导航不遮挡表单） ---------- */
#contact-form { scroll-margin-top: calc(var(--header-h, 72px) + 24px); }

/* ---------- 13b. 社交平台链接按钮 ---------- */
/* 默认用于浅色背景（contact 页），页脚里另有深色覆盖 */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}
.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-3);
  transition: transform .25s var(--ease), background-color .25s var(--ease),
              border-color .25s var(--ease), color .25s var(--ease);
}
.social-btn svg { width: 19px; height: 19px; fill: currentColor; display: block; }
.social-btn:hover {
  transform: translateY(-2px);
  color: #fff;
  border-color: transparent;
}
.social-btn--linkedin:hover  { background: #0a66c2; }
.social-btn--facebook:hover  { background: #1877f2; }
.social-btn--instagram:hover { background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%); }
.social-btn--x:hover         { background: #000; }
/* 页脚深色底：描边与图标色转浅 */
.footer .social-btn {
  background: rgba(255, 255, 255, .04);
  border-color: rgba(255, 255, 255, .18);
  color: #94a3b8;
}
.footer .social-btn:hover { color: #fff; border-color: transparent; }

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: .84rem;
}

/* ---------- 14. 面包屑 / 页头 ---------- */
.page-hero {
  padding: clamp(48px, 7vw, 88px) 0 clamp(40px, 5vw, 64px);
  background: linear-gradient(160deg, #f8fafc, #eff6ff);
  border-bottom: 1px solid var(--line);
}
.page-hero p { color: var(--ink-3); max-width: 62ch; font-size: 1.05rem; margin: 0; }

/* ---------- 15. 客户 Logo 墙 ---------- */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
  align-items: center;
}
.logo-wall__item {
  height: 64px;
  border: 1px solid var(--line);
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--ink-3);
  background: #fff;
  font-size: .9rem;
  transition: all .25s var(--ease);
}
.logo-wall__item:hover { color: var(--brand); border-color: var(--brand); }

/* ---------- 16. 常见问题 ---------- */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: #fff;
  overflow: hidden;
}
.faq-item__q {
  width: 100%;
  text-align: left;
  padding: 18px 22px;
  background: none;
  border: 0;
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.faq-item__q::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--brand);
  font-weight: 400;
  transition: transform .25s var(--ease);
}
.faq-item.is-open .faq-item__q::after { transform: rotate(45deg); }
.faq-item__a {
  display: none;
  padding: 0 22px 20px;
  color: var(--ink-3);
  font-size: .95rem;
  margin: 0;
}
.faq-item.is-open .faq-item__a { display: block; }

/* ---------- 17. 动画（滚动进场） ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
  .nav-toggle { display: grid; }
  .header__cta .btn { display: none; }
  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px 24px 20px;
    box-shadow: var(--shadow);
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 12px 8px; font-size: 1rem; }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .cta-bar { text-align: center; justify-content: center; }
  .container { padding-inline: 18px; }
}

/* ============================================================
   19. Vistaplus 品牌定制
   ============================================================ */

/* ---------- 19.1 Logo（图片版 / 纯文字版） ---------- */
.logo img { height: 48px; width: auto; display: block; }
@media (max-width: 860px) { .logo img { height: 38px; } }
.logo--text { font-style: italic; font-weight: 900; letter-spacing: -.03em; }
.logo--text .plus { color: var(--brand); }
.logo--dark img { filter: brightness(0) invert(1); }

/* ---------- 19.2 深色 Hero ---------- */
.hero--dark {
  background:
    radial-gradient(1100px 560px at 88% -12%, rgba(103, 193, 44, .16) 0%, transparent 60%),
    radial-gradient(900px 480px at 2% 14%, rgba(103, 193, 44, .09) 0%, transparent 55%),
    linear-gradient(160deg, #0c1014 0%, #161c22 100%);
  color: #aab4bf;
}
.hero--dark h1 { color: #fff; }
.hero--dark .hero__lead { color: #9aa4af; }
.hero--dark .eyebrow { color: var(--brand); }
.hero__stats { border-top-color: rgba(255, 255, 255, .14); }
.hero__stats b { color: #fff; }
.hero__stats b .plus { color: var(--brand); }
.hero__stats span { color: #8d97a2; }

/* 产品图为白底渲染图 → 放在白色面板上呈现 */
.hero__visual--flush {
  background: #fff;
  border-radius: var(--radius-lg);
  aspect-ratio: auto;
  display: grid;
  place-items: center;
  padding: clamp(18px, 3vw, 34px);
  box-shadow: 0 30px 60px rgba(0, 0, 0, .45);
}
.hero__visual--flush img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

/* ---------- 19.3 图片卡（浅色背景产品图） ---------- */
.card--media .card__imgbox {
  background: #f2f4f3;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.card--media .card__imgbox img {
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
  transition: transform .35s var(--ease);
}
.card--media:hover .card__imgbox img { transform: scale(1.04); }

/* ---------- 19.4 产品系列页头 ---------- */
.series-hero {
  padding: clamp(40px, 6vw, 72px) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}
.series-hero .grid { gap: clamp(28px, 4vw, 56px); align-items: center; }
.series-hero h1 { font-size: clamp(1.7rem, 3vw, 2.6rem); }
.series-hero img { max-height: 420px; width: auto; max-width: 100%; margin-inline: auto; }
.series-hero--alt { background: var(--bg-soft); }

/* 系列内导航（sticky 子导航） */
.subnav {
  position: sticky;
  top: var(--header-h);
  z-index: 90;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.subnav__inner {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  height: 54px;
  align-items: center;
}
.subnav a {
  flex: 0 0 auto;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--ink-2);
  border: 1px solid transparent;
  white-space: nowrap;
}
.subnav a:hover { background: var(--brand-light); color: var(--brand-dark); }
.subnav a.is-active { background: var(--dark); color: #fff; }

/* ---------- 19.5 规格参数表 ---------- */
.spec-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  min-width: 620px;
}
.spec-table th,
.spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.spec-table thead th {
  background: var(--dark);
  color: #fff;
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: .04em;
  white-space: nowrap;
}
.spec-table thead th:first-child { background: #0a0d10; }
.spec-table tbody th {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  width: 1%;
}
.spec-table tbody td { color: var(--ink-2); }
.spec-table tbody tr:last-child th,
.spec-table tbody tr:last-child td { border-bottom: none; }
.spec-table tbody tr:hover { background: var(--bg-soft); }
.spec-note { font-size: .8rem; color: var(--ink-3); margin: 10px 0 0; }

/* ---------- 19.6 特性对比 / 模式卡 ---------- */
.mode-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fff;
}
.mode-card__head {
  background: var(--dark);
  color: #fff;
  padding: 16px 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.mode-card__head .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
}
.mode-card__body { padding: 22px; }
.mode-card__body p { font-size: .93rem; color: var(--ink-3); margin: 0; }

/* ---------- 19.7 深色段落数据 ---------- */
.stats--dark { color: #cbd5e1; }
.stat-big { font-size: clamp(2rem, 3.6vw, 2.8rem); font-weight: 800; color: #fff; line-height: 1.2; }
.stat-big .plus { color: var(--brand); }

/* ---------- 19.8 徽标墙 / 认证 ---------- */
.cert-badge {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--ink-2);
  background: #fff;
  margin: 0 10px 12px 0;
}

/* ---------- 19.9 时间线（关于页复用，年份绿色） ---------- */
.page-hero--dark {
  background: linear-gradient(160deg, #0c1014, #161c22);
  border-bottom: none;
  color: #9aa4af;
}
.page-hero--dark h1 { color: #fff; }

/* ---------- 19.10 动态背景 Hero（真实时代广场照片 + 动画） ---------- */
.hero--media {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  color: #dfe5ec;
}
/* 背景层：静态照片作 poster 与降级底图，视频元素铺满其上 */
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: url('../img/hero-times-square.jpg') center 45% / cover no-repeat;
}
.hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 45%;
}

/* 左侧压暗保证文字可读 */
.hero--media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;   /* 纯装饰压暗层，不能拦截 hero 内按钮的点击 */
  /* 视频/照片自身已有对比，这里只做最低限度的左侧压暗保证标题可读 */
  background: linear-gradient(90deg,
    rgba(6, 9, 14, .38) 0%,
    rgba(6, 9, 14, .16) 40%,
    rgba(6, 9, 14, .02) 100%);
}
/* 高光扫过 → 动态感，纯 CSS 零流量 */
.hero--media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(105deg,
    transparent 42%,
    rgba(255, 255, 255, .10) 50%,
    transparent 58%);
  background-size: 260% 100%;
  animation: heroSweep 8s linear infinite;
}
@keyframes heroSweep {
  from { background-position: 160% 0; }
  to   { background-position: -80% 0; }
}
.hero--media .container { position: relative; z-index: 4; padding-block: clamp(72px, 10vw, 132px); }
.hero__panel {
  max-width: 660px;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius-lg);
  background: rgba(8, 11, 16, .70);
  backdrop-filter: blur(12px);
  box-shadow: 0 30px 70px rgba(0, 0, 0, .45);
}
.hero--media h1 { color: #fff; }
.hero--media h1 span { color: var(--brand); }
.hero--media .hero__lead { color: #c6ced8; }
.hero--media .hero__stats { border-top-color: rgba(255, 255, 255, .28); }
.hero--media .hero__stats b { color: #fff; }
.hero--media .hero__stats b .plus,
.hero--media .hero__stats span { color: #bcc5cf; }
.hero--media .hero__visual--flush { box-shadow: 0 30px 70px rgba(0, 0, 0, .6); }

/* 减弱动态偏好 / 旧浏览器降级：换静态海报，关闭所有动画 */
@media (prefers-reduced-motion: reduce) {
  .hero__video { display: none; }
  .hero--media::after { display: none; }
}

/* ============================================================
   20. 导航下拉菜单
   ============================================================ */
.nav__item { position: relative; }
.nav .caret {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: 7px;
  vertical-align: 2px;
  transition: transform .18s var(--ease);
}
.has-dropdown.is-open .caret { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 320px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 20px 44px rgba(2, 6, 12, .16);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s;
  z-index: 130;
}
.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown,
.has-dropdown.is-open .dropdown {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.dropdown a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
}
.dropdown a:hover { background: var(--brand-light); color: var(--ink); }
.dropdown a b { display: block; font-size: .95rem; color: var(--ink); font-weight: 700; }
.dropdown a span { display: block; font-size: .8rem; color: var(--ink-3); margin-top: 2px; }

/* 移动端专用：控制台入口 & 展开式下拉 */
.nav__console { display: none; }

@media (max-width: 860px) {
  .dropdown {
    position: static;
    display: none;
    min-width: 0;
    padding: 2px 0 8px 14px;
    background: transparent;
    border: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .has-dropdown.is-open .dropdown { display: block; }
  .dropdown a { padding: 8px 0; }
  .nav__console { display: block; font-weight: 600; }
}