/* ============================================================
   北京魔尚数字科技 — 官网样式
   风格参照：中材国际 SINOMA 官网
   设计语言：深蓝 #1B3A5C × 金色 #D4A843 × 蓝图网格 × 斜切分区
   ============================================================ */

:root {
  --navy: #1B3A5C;
  --navy-hover: #2A4F75;
  --navy-tsp-92: rgba(27, 58, 92, .92);
  --navy-tsp-80: rgba(27, 58, 92, .80);
  --navy-tsp-60: rgba(27, 58, 92, .60);
  --navy-tsp-30: rgba(27, 58, 92, .30);
  --navy-tsp-10: rgba(27, 58, 92, .10);
  --gold: #D4A843;
  --gold-light: #E0B85A;
  --gold-line: #D6A54D;
  --gold-tsp-30: rgba(212, 168, 67, .30);
  --bg-light: #F7F8FA;
  --bg-gray: #F3F4F6;
  --text-body: #555555;
  --text-muted: #8C8C8C;
  --border-line: #F3F4F6;
  --font-sans: "SimHei", "黑体", "Heiti SC", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", system-ui, sans-serif;
  --font-serif-en: "SimHei", "黑体", "Heiti SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, "Courier New", "SimHei", "黑体", "Microsoft YaHei", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

/* 锚点定位偏移：避免被固定导航遮挡 */
section[id], div[id] { scroll-margin-top: 4.5rem; }

body {
  font-family: var(--font-sans);
  background: #fff;
  color: var(--text-body);
  line-height: 1.6;
  font-size: 16px;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container { max-width: 80rem; margin: 0 auto; padding: 0 1.5rem; }
@media (min-width: 1024px) { .container { padding: 0 2rem; } }

/* ---------- 蓝图网格纹理 ---------- */
.blueprint-grid {
  background-image:
    linear-gradient(rgba(27, 58, 92, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 58, 92, .04) 1px, transparent 1px);
  background-size: 40px 40px;
}
.blueprint-grid-dark {
  background-image:
    linear-gradient(rgba(255, 255, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .06) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ---------- 斜切分区 ---------- */
.diagonal-cut-top {
  clip-path: polygon(0 4rem, 100% 0, 100% 100%, 0 100%);
  margin-top: -2rem;
  padding-top: 6rem;
}
.diagonal-cut-bottom {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 4rem), 0 100%);
  padding-bottom: 6rem;
}

/* ---------- 标题体系 ---------- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 1rem;
  font-size: .75rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.eyebrow::before { content: ""; width: 2rem; height: 1px; background: var(--gold); }
.eyebrow::after { content: ""; width: 2rem; height: 1px; background: var(--gold); }
.eyebrow--gold { color: var(--gold); }
.eyebrow--center { justify-content: center; }
.eyebrow--light { color: rgba(255, 255, 255, .6); }

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.25;
  position: relative;
  padding-bottom: 0;
}
@media (min-width: 1024px) { .section-title { font-size: 2.25rem; } }
.section-title::after {
  content: "";
  position: absolute;
  bottom: -.8rem;
  left: 0;
  width: 3rem;
  height: 3px;
  background: var(--gold-line);
}
.section-title--center::after { left: 50%; transform: translateX(-50%); }
.section-title--light { color: #fff; }

.section-title-en {
  font-family: var(--font-serif-en);
  font-style: normal;
  font-size: 1rem;
  color: var(--text-muted);
  margin-top: 1.4rem;
  letter-spacing: .04em;
}
.section-title-en--light { color: rgba(255, 255, 255, .45); }

.section { padding: 3.5rem 0; }
@media (min-width: 1024px) { .section { padding: 4.5rem 0; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .875rem 1.75rem;
  font-size: .875rem;
  font-weight: 600;
  transition: all .3s ease;
}
.btn--gold { background: var(--gold); color: var(--navy); }
.btn--gold:hover { background: var(--gold-light); }
.btn--outline-light { border: 1px solid rgba(255, 255, 255, .3); color: #fff; }
.btn--outline-light:hover { background: rgba(255, 255, 255, .1); }
.btn--navy { background: var(--navy); color: #fff; }
.btn--navy:hover { background: var(--navy-hover); }
.btn--outline-navy { border: 1px solid var(--navy-tsp-30); color: var(--navy); }
.btn--outline-navy:hover { border-color: var(--navy); background: var(--navy-tsp-10); }
.btn .arrow { transition: transform .3s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}
.site-header--transparent { background: transparent; }
.site-header--solid { background: #fff; box-shadow: 0 1px 12px rgba(27, 58, 92, .08); }

.logo { display: flex; align-items: center; gap: .65rem; }
.logo-mark {
  width: 2.2rem; height: 2.2rem;
  background: var(--gold);
  color: var(--navy);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
}
.logo-mark--img {
  background: none;
  object-fit: cover;
  flex: none;
}
.logo-text { line-height: 1.15; }
.logo-text .cn { font-weight: 700; font-size: 1.05rem; letter-spacing: .08em; }
.logo-text .en { font-size: .6rem; letter-spacing: .28em; opacity: .65; font-family: var(--font-mono); }

.site-nav { display: none; align-items: center; gap: 2.2rem; }
@media (min-width: 1024px) { .site-nav { display: flex; } }
.site-nav a {
  font-size: .9rem;
  font-weight: 500;
  padding: .4rem 0;
  position: relative;
  transition: color .25s ease;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--gold);
  transition: width .3s ease;
}
.site-nav a:hover::after, .site-nav a.active::after { width: 100%; }

/* 透明态（首页顶部）：白字 */
.site-header--transparent .logo-text .cn,
.site-header--transparent .site-nav a { color: #fff; }
.site-header--transparent .logo-text .en { color: rgba(255, 255, 255, .65); }
.site-header--transparent .site-nav a:hover { color: var(--gold-light); }
/* 白底态：深蓝字 */
.site-header--solid .logo-text .cn,
.site-header--solid .site-nav a { color: var(--navy); }
.site-header--solid .logo-text .en { color: var(--text-muted); }
.site-header--solid .site-nav a:hover { color: var(--gold); }
.site-header--solid .site-nav a.active { color: var(--gold); }

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  z-index: 110;
}
@media (min-width: 1024px) { .nav-toggle { display: none; } }
.nav-toggle span {
  width: 22px; height: 2px;
  background: currentColor;
  transition: all .3s ease;
  display: block;
}
.site-header--transparent .nav-toggle { color: #fff; }
.site-header--solid .nav-toggle { color: var(--navy); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 105;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  color: #fff;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: .1em;
}
.mobile-menu a.active { color: var(--gold); }

/* ---------- Hero（首页） ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--navy);
}
.hero .hero-bg {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}
.hero .hero-shade {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(27, 58, 92, .72) 0%, rgba(27, 58, 92, .35) 55%, transparent 100%),
    linear-gradient(0deg, rgba(27, 58, 92, .38) 0%, transparent 45%);
}
.hero .hero-inner { position: absolute; inset: 0; width: 100%; display: flex; flex-direction: column; justify-content: center; }
.hero-credit {
  position: absolute;
  right: clamp(1.1rem, 4vw, 3rem);
  bottom: 1.6rem;
  z-index: 3;
  color: #fff;
  font-family: "Microsoft YaHei Light", "微软雅黑 Light", "PingFang SC", "SimHei", "黑体", sans-serif;
  font-weight: 300;
  font-size: .92rem;
  letter-spacing: .04em;
  line-height: 1.5;
  padding: .55rem 1rem;
  background: rgba(27, 58, 92, .55);
  border-left: 3px solid var(--gold);
  text-shadow: 0 1px 6px rgba(0, 0, 0, .5);
}
@media (max-width: 767px) {
  .hero-credit { font-size: .78rem; bottom: 1.1rem; padding: .45rem .75rem; }
}
.hero-tag {
  display: flex; align-items: center; gap: .75rem;
  margin-bottom: 1.2rem;
  color: var(--gold);
  font-size: .72rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}
.hero-tag::before { content: ""; width: 2rem; height: 1px; background: var(--gold); }
.hero h1 {
  color: #fff;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 1.1rem;
}
@media (min-width: 768px) { .hero h1 { font-size: 2.4rem; } }
@media (min-width: 1024px) { .hero h1 { font-size: 2.9rem; } }
.hero .hero-sub {
  color: rgba(255, 255, 255, .72);
  font-size: .95rem;
  line-height: 2;
  max-width: 30rem;
  margin-bottom: .8rem;
}
.hero .hero-note {
  color: rgba(255, 255, 255, .4);
  font-size: .78rem;
  letter-spacing: .12em;
  margin-bottom: 0;
  font-family: var(--font-mono);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; }

/* Hero 底部数据条 */
.hero-stats {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: var(--navy-tsp-80);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, .1);
  color: var(--gold);
}
.hero-stats .stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  padding: 1.25rem 0;
}
@media (min-width: 768px) { .hero-stats .stats-grid { grid-template-columns: repeat(4, 1fr); } }
.stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: #fff;
  letter-spacing: -.02em;
}
@media (min-width: 768px) { .stat-num { font-size: 1.875rem; } }
.stat-num .unit { color: var(--gold); font-size: 1.1rem; margin-left: .15rem; }
.stat-label { font-size: .75rem; color: rgba(255, 255, 255, .5); margin-top: .25rem; }

/* ---------- 内页页头 ---------- */
.page-hero {
  position: relative;
  padding: 9rem 0 5rem;
  background: var(--navy);
  overflow: hidden;
}
.page-hero .page-hero-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: .28;
}
.page-hero .page-hero-inner { position: relative; }
.page-hero h1 { color: #fff; font-size: 2.25rem; font-weight: 700; }
@media (min-width: 1024px) { .page-hero h1 { font-size: 2.75rem; } }
.page-hero .page-hero-en {
  font-family: var(--font-serif-en);
  font-style: normal;
  color: rgba(255, 255, 255, .4);
  margin-top: .5rem;
  letter-spacing: .05em;
}
.breadcrumb {
  margin-top: 1.5rem;
  font-size: .8rem;
  color: rgba(255, 255, 255, .5);
  font-family: var(--font-mono);
}
.breadcrumb a { color: var(--gold); }
.breadcrumb .sep { margin: 0 .5rem; color: rgba(255, 255, 255, .3); }

/* ---------- 关于区（图文） ---------- */
.about-grid {
  display: grid;
  gap: 4rem;
  align-items: start;
}
@media (min-width: 1024px) {
  .about-grid { grid-template-columns: 1fr 1fr; gap: 5rem; }
}
.about-figure { position: relative; }
.about-figure img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}
@media (min-width: 1024px) { .about-figure img { height: 500px; } }
.about-figure .figure-shade {
  position: absolute; inset: 0;
  background: linear-gradient(0deg, var(--navy-tsp-30), transparent);
}
.about-figure .corner {
  position: absolute;
  top: -12px; left: -12px;
  width: 3rem; height: 3rem;
  border-top: 3px solid var(--gold);
  border-left: 3px solid var(--gold);
}
.about-figure .figure-credit {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  background: linear-gradient(transparent, rgba(27,58,92,.88));
  color: #fff;
  font-family: "Microsoft YaHei Light", "微软雅黑 Light", "PingFang SC", "SimHei", "黑体", sans-serif;
  font-weight: 300;
  font-size: .9rem;
  padding: 1.8rem .9rem .6rem;
  letter-spacing: .04em;
  text-align: right;
}

.about-text p { margin-bottom: 1.25rem; line-height: 1.9; }
.about-text p strong { color: var(--navy); }
.tag-row { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1.5rem 0 2rem; }
.tag-row .tag {
  padding: .45rem 1rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--navy);
  background: var(--navy-tsp-10);
  border: 1px solid rgba(27, 58, 92, .12);
}

/* 企业名片（关于页） */
.profile-card {
  background: var(--navy);
  color: #fff;
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}
.profile-card .profile-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.profile-card .profile-row:last-child { border-bottom: none; }
.profile-card .k { font-size: .8rem; color: rgba(255, 255, 255, .5); letter-spacing: .1em; }
.profile-card .v { font-weight: 700; color: var(--gold); font-size: .95rem; text-align: right; }

/* ---------- 深蓝数据区 ---------- */
.dark-stats {
  position: relative;
  background: var(--navy);
  color: #fff;
  padding: 3rem 0 3.75rem;
}
.dark-stats .stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 2rem;
}
@media (min-width: 1024px) {
  .dark-stats .stats-grid { grid-template-columns: repeat(5, 1fr); gap: 4rem 2.5rem; }
}
/* 深蓝数据区：整屏细黑体 */
.dark-stats .section-title,
.dark-stats .eyebrow,
.dark-stat .num,
.dark-stat .label,
.dark-stat .desc {
  font-family: "Microsoft YaHei Light", "微软雅黑 Light", "PingFang SC", "SimHei", "黑体", sans-serif;
  font-weight: 300;
}
.dark-stat .num {
  font-weight: 300;
  font-size: clamp(3rem, 8.5vw, 6.75rem);
  letter-spacing: -.02em;
  line-height: 1.1;
}
.dark-stat .num .plus { color: var(--gold); font-size: .38em; vertical-align: baseline; position: relative; top: -.08em; }
.dark-stat .num .year-unit {
  font-family: "Yuanti SC", "YouYuan", "幼圆", "HYRunYuan", "SimHei", "黑体", "Microsoft YaHei", sans-serif;
  font-size: .38em;
  margin-left: .1em;
}
.dark-stat .label {
  font-size: .85rem;
  font-weight: 300;
  margin-top: .4rem;
}
.dark-stat .desc { font-size: .78rem; font-weight: 300; color: rgba(255, 255, 255, .55); margin-top: .5rem; line-height: 1.7; }

/* ---------- 卡片体系 ---------- */
.card-grid { display: grid; gap: 1.5rem; }
.card-grid--2 { grid-template-columns: 1fr; }
.card-grid--3 { grid-template-columns: 1fr; }
.card-grid--4 { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 768px) {
  .card-grid--2 { grid-template-columns: repeat(2, 1fr); }
  .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
  .card-grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* 展馆案例照片：缩小水平间隔，保留垂直间隔 */
#exhibition .card-grid--4 { column-gap: 1px; row-gap: 1.2rem; }
#cases .card-grid--3 { column-gap: 1px; row-gap: 1.2rem; }
@media (min-width: 768px) and (max-width: 1023px) {
  #exhibition .card-grid--4 { column-gap: 1px; }
}

.biz-card {
  background: #fff;
  border: 1px solid var(--border-line);
  overflow: hidden;
  transition: all .5s ease;
  display: flex;
  flex-direction: column;
}
.biz-card:hover {
  border-color: var(--gold-tsp-30);
  box-shadow: 0 16px 40px rgba(27, 58, 92, .12);
  transform: translateY(-4px);
}
.biz-card .card-img {
  position: relative;
  height: 13rem;
  overflow: hidden;
}
.biz-card .card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.biz-card:hover .card-img img { transform: scale(1.06); }
.biz-card .card-img .card-no {
  position: absolute;
  top: 1rem; left: 1rem;
  background: var(--navy-tsp-92);
  color: var(--gold);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .85rem;
  padding: .35rem .8rem;
}
.biz-card .card-img .card-name {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(27,58,92,.88));
  color: #fff;
  font-family: "Microsoft YaHei Light", "微软雅黑 Light", "PingFang SC", "SimHei", "黑体", sans-serif;
  font-weight: 300;
  font-size: .9rem;
  padding: 1.6rem .9rem .55rem;
  letter-spacing: .04em;
}
.biz-card .card-body { padding: 1.75rem; flex: 1; }
.biz-card h3 { color: var(--navy); font-size: 1.2rem; font-weight: 700; margin-bottom: .3rem; }
.biz-card .card-en {
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: .9rem;
}
.biz-card p { font-size: .9rem; line-height: 1.8; min-height: 7.2em; } /* 锁定4行，中英切换布局不跳动 */
.biz-card .card-foot {
  padding: 0 1.75rem 1.5rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--gold);
  white-space: nowrap; /* 锁定1行 */
}
.biz-card .card-foot::before { content: "— "; }

/* 案例卡（展厅图集） */
.case-card {
  position: relative;
  overflow: hidden;
  display: block;
}
.case-card img {
  width: 100%;
  height: 16rem;
  object-fit: cover;
  transition: transform .6s ease;
}
.case-card:hover img { transform: scale(1.07); }
.case-card .case-mask {
  position: absolute; inset: 0;
  background: linear-gradient(0deg, var(--navy-tsp-92) 0%, transparent 55%);
  opacity: .85;
  transition: opacity .4s ease;
}
.case-card:hover .case-mask { opacity: 1; }
.case-card .case-info {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 1.25rem;
  padding-left: .8rem; /* 文字左移 */
  padding-bottom: .45rem; /* 文字下移 */
  color: #fff;
}
.case-card .case-year {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--gold);
  letter-spacing: .15em;
  margin-bottom: .3rem;
}
.case-card .case-name {
  font-family: "Microsoft YaHei Light", "微软雅黑 Light", "PingFang SC", "SimHei", "黑体", sans-serif;
  font-weight: 300;
  font-size: .88rem;
  line-height: 1.45;
  letter-spacing: .02em;
}
.case-card .case-type { font-size: .75rem; color: rgba(255, 255, 255, .6); margin-top: .2rem; }

/* 图注卡 */
.caption-card img { width: 100%; height: 14rem; object-fit: cover; }
.caption-card .cap {
  padding: .9rem 0;
  font-size: .82rem;
  color: var(--text-muted);
  display: flex; align-items: center; gap: .5rem;
  white-space: nowrap; /* 锁定1行，中英切换图片组高度一致 */
}
.caption-card .cap::before { content: ""; width: 1.2rem; height: 1px; background: var(--gold); flex-shrink: 0; }

/* ---------- AI 方向 ---------- */
.ai-grid { display: grid; gap: 1.25rem; }
@media (min-width: 768px) { .ai-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .ai-grid { grid-template-columns: repeat(4, 1fr); } }
.ai-item {
  background: #fff;
  border: 1px solid var(--border-line);
  border-top: 3px solid var(--gold);
  padding: 1.75rem 1.5rem;
  transition: all .4s ease;
}
.ai-item:hover {
  box-shadow: 0 14px 34px rgba(27, 58, 92, .1);
  transform: translateY(-4px);
}
.ai-item .ai-no {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--gold-tsp-30);
  margin-bottom: .75rem;
  transition: color .3s ease;
}
.ai-item:hover .ai-no { color: var(--gold); }
.ai-item h4 { color: var(--navy); font-size: 1.05rem; font-weight: 700; margin-bottom: .6rem; }
.ai-item p { font-size: .85rem; line-height: 1.75; }

/* ---------- 年表（时间线） ---------- */
.timeline { position: relative; padding-left: 3.5rem; }
.timeline::before {
  content: "";
  position: absolute;
  left: .9rem; top: .4rem; bottom: .4rem;
  width: 1px;
  background: var(--navy-tsp-10);
}
.timeline-item { position: relative; padding-bottom: 2.5rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -3.5rem;
  top: .45rem;
  width: 1.9rem; height: 1.9rem;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--gold);
}
.timeline-item::after {
  content: "";
  position: absolute;
  left: -2.75rem;
  top: .8rem;
  width: .45rem; height: .45rem;
  border-radius: 50%;
  background: var(--gold);
}
.timeline-item .year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--navy);
  margin-bottom: .5rem;
}
.timeline-item .year .cnt {
  font-size: .75rem;
  color: var(--gold);
  font-weight: 600;
  margin-left: .6rem;
  letter-spacing: .1em;
}
.timeline-item .events { display: flex; flex-direction: column; gap: .45rem; }
.timeline-item .events span {
  font-size: .9rem;
  line-height: 1.7;
  padding-left: 1rem;
  position: relative;
}
.timeline-item .events span::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: .35rem; height: .35rem;
  background: var(--navy-tsp-30);
}

/* ---------- 名录列表 ---------- */
.client-block {
  background: #fff;
  border: 1px solid var(--border-line);
  padding: 2rem;
  border-left: 3px solid var(--gold);
  transition: box-shadow .4s ease;
}
.client-block:hover { box-shadow: 0 12px 30px rgba(27, 58, 92, .08); }
.client-block h3 { color: var(--navy); font-size: 1.05rem; margin-bottom: .9rem; }
.client-block h3 .en {
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-left: .6rem;
  text-transform: uppercase;
}
.client-block .names { font-size: .92rem; line-height: 2; color: var(--text-body); }

/* ---------- 案例标签云 ---------- */
.work-cloud { display: flex; flex-wrap: wrap; gap: .55rem; }
.work-cloud .w {
  padding: .4rem .95rem;
  font-size: .8rem;
  color: var(--navy);
  background: #eaf1f7;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: all .25s ease;
}
.work-cloud .w:nth-child(5n+2) { background: #f6f1e3; }
.work-cloud .w:nth-child(5n+3) { background: #e9f2ec; }
.work-cloud .w:nth-child(5n+4) { background: #f4efec; }
.work-cloud .w:nth-child(5n+5) { background: #efeff1; }
.work-cloud .w:hover {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

/* ---------- 数字列表（央视数据等） ---------- */
.num-list { display: grid; gap: 1rem; }
.num-list .row {
  display: flex;
  gap: 1.25rem;
  background: #fff;
  border: 1px solid var(--border-line);
  padding: 1.25rem 1.5rem;
  align-items: flex-start;
}
.num-list .row .no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--gold-tsp-30);
  line-height: 1.2;
  min-width: 2.5rem;
}
.num-list .row h4 { color: var(--navy); font-size: 1rem; margin-bottom: .3rem; }
.num-list .row p { font-size: .88rem; line-height: 1.75; }

/* ---------- CTA 合作区 ---------- */
.cta {
  position: relative;
  background: var(--navy);
  color: #fff;
  padding: 1.75rem 0 2rem;
  overflow: hidden;
}
.cta .cta-inner { position: relative; text-align: center; max-width: 46rem; margin: 0 auto; }
.cta .cta-en {
  font-family: var(--font-serif-en);
  font-style: normal;
  color: var(--gold);
  font-size: 1.1rem;
  letter-spacing: .25em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}
.cta h2 { font-size: 2rem; font-weight: 700; margin-bottom: 1.2rem; }
@media (min-width: 1024px) { .cta h2 { font-size: 2.5rem; } }
.cta p { color: rgba(255, 255, 255, .65); line-height: 1.9; margin-bottom: 2.2rem; }

/* ---------- 联系表单 ---------- */
.contact-grid { display: grid; gap: 3.5rem; }
@media (min-width: 1024px) {
  .contact-grid { grid-template-columns: 3fr 2fr; gap: 4rem; }
}
.form-grid { display: grid; gap: 1.25rem; }
@media (min-width: 768px) { .form-grid--2 { grid-template-columns: repeat(2, 1fr); } }
.field label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: .45rem;
  letter-spacing: .05em;
}
.field input, .field select, .field textarea {
  width: 100%;
  padding: .8rem 1rem;
  border: 1px solid rgba(27, 58, 92, .15);
  background: #fff;
  font-size: .9rem;
  font-family: inherit;
  color: var(--navy);
  transition: border-color .25s ease, box-shadow .25s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212, 168, 67, .15);
}
.field textarea { min-height: 8rem; resize: vertical; }
.contact-info .info-item { padding: 1.1rem 0; border-bottom: 1px solid var(--border-line); }
.contact-info .info-item .k {
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: .3rem;
}
.contact-info .info-item .v { color: var(--navy); font-weight: 600; font-size: .95rem; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--navy);
  color: #fff;
  position: relative;
}
.site-footer .footer-main {
  display: grid;
  gap: 2.5rem;
  padding: 4rem 0 3rem;
}
@media (min-width: 768px) { .site-footer .footer-main { grid-template-columns: 2fr 1fr 1fr 1.4fr; } }
.site-footer .f-col h4 {
  font-size: .78rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
  font-family: var(--font-mono);
  margin-bottom: 1.1rem;
}
.site-footer .f-col a, .site-footer .f-col p {
  display: block;
  font-size: .88rem;
  color: rgba(255, 255, 255, .6);
  padding: .28rem 0;
  transition: color .25s ease;
}
.site-footer .f-col a:hover { color: var(--gold-light); }
.site-footer .f-about p { line-height: 1.9; }
.site-footer .f-logo { display: flex; align-items: center; gap: .65rem; margin-bottom: 1.2rem; }
.site-footer .footer-bar {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 1.4rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  justify-content: space-between;
  font-size: .78rem;
  color: rgba(255, 255, 255, .4);
  font-family: var(--font-mono);
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 1.5rem; bottom: 1.5rem;
  width: 2.75rem; height: 2.75rem;
  background: var(--navy);
  color: var(--gold);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  pointer-events: none;
  transition: all .3s ease;
  z-index: 90;
  box-shadow: 0 8px 24px rgba(27, 58, 92, .25);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--navy-hover); }

/* ---------- 滚动淡入（仅 JS 可用时启用隐藏） ---------- */
.js-on .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.js-on .reveal.visible { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: .1s; }
.reveal-d2 { transition-delay: .2s; }
.reveal-d3 { transition-delay: .3s; }

/* ---------- 区块间距工具 ---------- */
.section-head { margin-bottom: 2rem; }
.section-head--flex {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}
@media (min-width: 768px) {
  .section-head--flex { flex-direction: row; align-items: flex-end; justify-content: space-between; }
}
.more-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--navy);
  transition: color .25s ease;
  white-space: nowrap;
}
.more-link:hover { color: var(--gold); }
.more-link .arrow { transition: transform .3s ease; }
.more-link:hover .arrow { transform: translateX(4px); }

.bg-light { background: var(--bg-light); }
.bg-gray { background: var(--bg-gray); }
.bg-navy { background: var(--navy); }

/* ---------- 图片灯箱（点击案例卡弹出大图） ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: rgba(8, 16, 26, .93);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3.5rem 2rem 2.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, visibility .25s ease;
  cursor: zoom-out;
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox img {
  max-width: min(92vw, 1400px);
  max-height: 82vh;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .5);
  border: 1px solid rgba(212, 168, 67, .35);
}
.lightbox .lb-cap {
  color: #fff;
  font-size: .95rem;
  letter-spacing: .08em;
  font-family: var(--font-sans);
}
.lightbox .lb-cap b { color: var(--gold); margin-right: .6rem; font-family: "Microsoft YaHei Light", "微软雅黑 Light", "PingFang SC", "SimHei", "黑体", sans-serif; font-weight: 300; }
.lightbox .lb-close {
  position: absolute;
  top: 1.1rem; right: 1.4rem;
  width: 2.6rem; height: 2.6rem;
  border: 1px solid rgba(255, 255, 255, .35);
  background: transparent;
  color: #fff;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color .2s, color .2s;
}
.lightbox .lb-close:hover { border-color: var(--gold); color: var(--gold); }
body.lb-lock { position: fixed; left: 0; right: 0; width: 100%; overflow: hidden; }

/* ---------- 顶部工具按钮（语言 / 主题切换） ---------- */
.nav-tools { display: flex; gap: .5rem; margin-left: 1.4rem; }
.tool-btn {
  font-size: .76rem; font-weight: 600; letter-spacing: .06em;
  padding: .34rem .78rem; border-radius: 999px;
  border: 1px solid rgba(27, 58, 92, .35);
  color: var(--navy); background: transparent; white-space: nowrap;
  transition: all .25s ease;
}
.tool-btn:hover { border-color: var(--gold); color: var(--gold); }
.site-header--transparent .tool-btn { color: #fff; border-color: rgba(255, 255, 255, .5); }
.site-header--transparent .tool-btn:hover { color: var(--gold-light); border-color: var(--gold-light); }
@media (max-width: 767px) { .tool-btn { padding: .26rem .5rem; font-size: .68rem; } }

/* ---------- 深色主题 ---------- */
body.theme-dark { background: #0A0A0C; color: #B9C4D0; }
body.theme-dark .site-header--solid { background: rgba(10, 10, 12, .95); box-shadow: 0 1px 12px rgba(0, 0, 0, .6); }
body.theme-dark .site-header--solid .logo-text .cn,
body.theme-dark .site-header--solid .site-nav a { color: #E8EEF5; }
body.theme-dark .site-header--solid .logo-text .en { color: #7E8CA0; }
body.theme-dark .site-header--solid .nav-toggle { color: #E8EEF5; }
body.theme-dark .mobile-menu { background: #0A0A0C; }
body.theme-dark .mobile-menu a { color: #E8EEF5; }
body.theme-dark .blueprint-grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
}
body.theme-dark .bg-light, body.theme-dark .bg-gray { background: #121214; }
body.theme-dark .section-title { color: #E8EEF5; }
body.theme-dark [style*="color:var(--navy)"] { color: #E8EEF5 !important; }
body.theme-dark .biz-card, body.theme-dark .ai-item, body.theme-dark .client-block, body.theme-dark .num-list .row { background: #16181C; border-color: rgba(255, 255, 255, .08); }
body.theme-dark .num-list .row h4 { color: #E8EEF5; }
body.theme-dark .client-block h3 { color: #E8EEF5; }
body.theme-dark .timeline::before { background: rgba(255, 255, 255, .12); }
body.theme-dark .timeline-item::before { background: #16181C; border: 1px solid rgba(255, 255, 255, .18); }
body.theme-dark .timeline-item .events span::before { background: var(--gold-tsp-30); }
body.theme-dark .work-cloud .w { background: rgba(122, 158, 193, .14); color: #C9D4E0; }
body.theme-dark .work-cloud .w:nth-child(5n+2) { background: rgba(212, 168, 67, .13); }
body.theme-dark .work-cloud .w:nth-child(5n+3) { background: rgba(129, 178, 148, .13); }
body.theme-dark .work-cloud .w:nth-child(5n+4) { background: rgba(199, 146, 112, .13); }
body.theme-dark .work-cloud .w:nth-child(5n+5) { background: rgba(255, 255, 255, .08); }
body.theme-dark .tag { background: rgba(255, 255, 255, .06); color: #C9D4E0; }
body.theme-dark .back-top { background: #16181C; color: #E8EEF5; }
body.theme-dark .caption-card .cap { color: #8FA0B5; }
body.theme-dark .timeline-item .year { color: #E8EEF5; }