/* =========================================
   铭赞网络 · 西安GEO优化与短视频推广
   主样式 - 简约大气 · 深海蓝+暖金
   ========================================= */

/* ----- CSS 变量 ----- */
:root {
  --c-navy: #0e2a47;
  --c-navy-dark: #081a30;
  --c-navy-light: #1a3a5f;
  --c-gold: #d4a04c;
  --c-gold-light: #e6b96d;
  --c-vermilion: #c83a2b;
  --c-action: #e8623a;
  --c-bg: #f7f4ef;
  --c-bg-warm: #f0ebe1;
  --c-white: #ffffff;
  --c-text: #1a1a1a;
  --c-text-2: #4a5868;
  --c-text-3: #5a6b7d;
  --c-text-light: rgba(255,255,255,.75);
  --c-border: #e5e1d8;
  --c-border-light: rgba(255,255,255,.12);

  --shadow-sm: 0 2px 8px rgba(14, 42, 71, 0.06);
  --shadow-md: 0 8px 24px rgba(14, 42, 71, 0.10);
  --shadow-lg: 0 16px 48px rgba(14, 42, 71, 0.18);
  --shadow-xl: 0 24px 64px rgba(14, 42, 71, 0.24);

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --container: 1280px;
  --gap: 96px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
               "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", "Songti SC", serif;
}

/* ----- 基础重置 ----- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: color .25s var(--ease); }
a:hover { color: var(--c-gold); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { background: none; border: none; cursor: pointer; font: inherit; color: inherit; }

/* ----- 容器 ----- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ----- 通用组件 ----- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--c-gold);
  text-transform: uppercase;
  margin-bottom: 18px;
  position: relative;
  padding-left: 36px;
}
.eyebrow::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 24px; height: 1.5px;
  background: var(--c-gold);
  transform: translateY(-50%);
}
.eyebrow-light { color: var(--c-gold-light); }
.eyebrow-light::before { background: var(--c-gold-light); }

.section {
  padding: 120px 0;
  position: relative;
}
.section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 72px;
}
.section-head-left { text-align: left; max-width: 920px; }
.section-title {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-navy);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.title-light { color: var(--c-white); }
.section-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-3);
}
.desc-light { color: var(--c-text-light); }

.text-gold { color: var(--c-gold); font-weight: 500; }

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all .3s var(--ease);
  white-space: nowrap;
  cursor: pointer;
  letter-spacing: 0.02em;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-gold) 0%, var(--c-gold-light) 100%);
  color: var(--c-navy);
  box-shadow: 0 4px 16px rgba(212, 160, 76, 0.32);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(212, 160, 76, 0.48);
  color: var(--c-navy);
}
.btn-ghost {
  color: var(--c-white);
  border: 1.5px solid rgba(255,255,255,.4);
  background: rgba(255,255,255,.04);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.7);
  color: var(--c-white);
}
.btn-outline-light {
  color: var(--c-white);
  border: 1.5px solid rgba(255,255,255,.5);
  background: transparent;
}
.btn-outline-light:hover {
  background: var(--c-white);
  color: var(--c-navy);
}

/* =========================================
   顶部导航 + Banner 一体区
   ========================================= */
.hero {
  position: relative;
  background: var(--c-navy-dark);
  color: var(--c-white);
  overflow: hidden;
}

.nav-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 14px 0;
  background: rgba(8, 26, 48, 0.4);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: all .35s var(--ease);
}
.nav-bar.scrolled {
  padding: 8px 0;
  background: rgba(8, 26, 48, 0.92);
  border-bottom-color: rgba(212, 160, 76, .25);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 40px;
}

/* 品牌LOGO */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}
.brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: 0.04em;
  position: relative;
}
.brand-r {
  font-size: 10px;
  color: var(--c-gold);
  margin-left: 2px;
  font-weight: 400;
  vertical-align: super;
}
.brand-divider {
  color: var(--c-gold);
  font-weight: 200;
  font-size: 20px;
}
.brand-slogan {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--c-gold-light);
  letter-spacing: 0.12em;
  font-weight: 400;
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  gap: 28px;
  margin-left: auto;
  margin-right: 16px;
  flex-wrap: nowrap;
  white-space: nowrap;
}
.nav-menu a {
  font-size: 13px;
  color: rgba(255,255,255,.78);
  font-weight: 400;
  position: relative;
  padding: 6px 0;
  transition: color .25s var(--ease);
  white-space: nowrap;
}
.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0; left: 50%;
  width: 0; height: 1.5px;
  background: var(--c-gold);
  transform: translateX(-50%);
  transition: width .3s var(--ease);
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--c-white);
}
.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-phone {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--c-gold);
  border: 1px solid rgba(212, 160, 76, 0.4);
  border-radius: 100px;
  background: rgba(212, 160, 76, 0.08);
  transition: all .25s var(--ease);
}
.nav-phone:hover {
  background: var(--c-gold);
  color: var(--c-navy);
  border-color: var(--c-gold);
}

/* 移动端菜单 */
.nav-toggle {
  display: none;
  width: 36px; height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 20px; height: 1.5px;
  background: var(--c-white);
  transition: all .3s var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ----- Banner ----- */
.banner {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}
.banner-track {
  position: relative;
  display: flex;
  width: 300%;
  height: 100vh;
  transition: transform .8s var(--ease-out);
}
.banner-slide {
  position: relative;
  width: 33.333%;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.banner-bg {
  position: absolute; inset: 0;
  z-index: 0;
}
.banner-bg::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--c-navy-dark) 0%, var(--c-navy) 50%, var(--c-navy-light) 100%);
}
.banner-slide[data-theme="video"] .banner-bg::before {
  background: linear-gradient(135deg, #1a1410 0%, #2a1a0e 50%, #3a2412 100%);
}
.banner-slide[data-theme="heritage"] .banner-bg::before {
  background: linear-gradient(135deg, #08111e 0%, #102540 50%, #1a2845 100%);
}

.banner-mesh {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(ellipse 800px 600px at 80% 20%, rgba(212, 160, 76, 0.18), transparent 60%),
    radial-gradient(ellipse 600px 500px at 20% 80%, rgba(26, 58, 95, 0.6), transparent 60%),
    radial-gradient(circle 400px at 50% 50%, rgba(212, 160, 76, 0.05), transparent 70%);
  filter: blur(0.5px);
  animation: meshFloat 20s ease-in-out infinite alternate;
}
.banner-mesh.mesh-warm {
  background-image:
    radial-gradient(ellipse 800px 600px at 80% 20%, rgba(232, 98, 58, 0.22), transparent 60%),
    radial-gradient(ellipse 600px 500px at 20% 80%, rgba(212, 160, 76, 0.18), transparent 60%),
    radial-gradient(circle 400px at 50% 50%, rgba(200, 58, 43, 0.08), transparent 70%);
}
.banner-mesh.mesh-dark {
  background-image:
    radial-gradient(ellipse 800px 600px at 80% 20%, rgba(212, 160, 76, 0.12), transparent 60%),
    radial-gradient(ellipse 600px 500px at 20% 80%, rgba(40, 80, 130, 0.5), transparent 60%);
}
@keyframes meshFloat {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.05); }
}

.banner-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: center;
  padding-top: 100px;
  padding-bottom: 80px;
}

.banner-eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--c-gold);
  letter-spacing: 0.2em;
  margin-bottom: 24px;
  padding: 6px 16px;
  background: rgba(212, 160, 76, 0.1);
  border: 1px solid rgba(212, 160, 76, 0.25);
  border-radius: 100px;
}
.banner-title {
  font-family: var(--font-serif);
  font-size: 52px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-white);
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}
.banner-sub {
  font-size: 17px;
  line-height: 1.85;
  color: rgba(255,255,255,.72);
  margin-bottom: 40px;
  max-width: 580px;
}
.banner-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.banner-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: rgba(255,255,255,.6);
}
.banner-meta strong {
  color: var(--c-gold);
  font-weight: 600;
  font-size: 16px;
  margin-right: 4px;
}
.banner-meta .dot {
  width: 4px; height: 4px;
  background: var(--c-gold);
  border-radius: 50%;
  opacity: 0.6;
}

/* Banner 装饰艺术 */
.banner-art {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
}
.ai-orbit {
  position: relative;
  width: 480px; height: 480px;
  max-width: 100%;
}
.orbit-center {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 120px; height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-light));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--c-navy);
  box-shadow: 0 0 60px rgba(212, 160, 76, 0.5);
  z-index: 2;
}
.orbit-ring {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) rotate(0deg);
  width: 100%; height: 100%;
  animation: rotateRing 30s linear infinite;
  z-index: 1;
}
.orbit-ring circle {
  fill: none;
  stroke: rgba(212, 160, 76, 0.25);
  stroke-width: 1;
  stroke-dasharray: 4 8;
}
@keyframes rotateRing {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}
.orbit-node {
  position: absolute;
  padding: 8px 16px;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 100px;
  font-size: 13px;
  color: var(--c-white);
  font-weight: 500;
  white-space: nowrap;
  z-index: 3;
}
.orbit-node.n1 { top: 8%;  left: 50%; transform: translateX(-50%); }
.orbit-node.n2 { top: 22%; right: 6%; }
.orbit-node.n3 { top: 50%; right: -2%; transform: translateY(-50%); }
.orbit-node.n4 { bottom: 22%; right: 6%; }
.orbit-node.n5 { bottom: 8%; left: 50%; transform: translateX(-50%); }
.orbit-node.n6 { top: 22%; left: 6%; }

/* 短视频电话卡栈 */
.phone-stack {
  position: relative;
  width: 100%;
  height: 460px;
}
.phone-card {
  position: absolute;
  background: rgba(255,255,255,.06);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 20px;
  padding: 24px 28px;
  color: var(--c-white);
  box-shadow: 0 24px 48px rgba(0,0,0,.3);
  animation: phoneFloat 6s ease-in-out infinite;
}
.phone-card.p1 {
  top: 0; left: 5%;
  width: 220px; height: 260px;
  animation-delay: 0s;
}
.phone-card.p2 {
  top: 80px; right: 8%;
  width: 200px; height: 240px;
  animation-delay: 1.5s;
  border-color: rgba(232, 98, 58, .3);
}
.phone-card.p3 {
  bottom: 0; left: 22%;
  width: 220px; height: 240px;
  animation-delay: 3s;
}
@keyframes phoneFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.phone-tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 12px;
  background: rgba(212, 160, 76, .15);
  color: var(--c-gold);
  border-radius: 100px;
  margin-bottom: 24px;
  letter-spacing: 0.1em;
}
.phone-card.p2 .phone-tag { color: var(--c-action); background: rgba(232, 98, 58, .15); }
.phone-card.p3 .phone-tag { color: #ff6b9d; background: rgba(255, 107, 157, .15); }
.phone-num {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.phone-lbl {
  font-size: 13px;
  color: rgba(255,255,255,.6);
}

/* 15年匠心 · 印章艺术 */
.seal-art {
  text-align: center;
  position: relative;
}
.seal-square {
  width: 220px; height: 220px;
  margin: 0 auto 32px;
  position: relative;
  background: linear-gradient(135deg, #c83a2b, #8a1f1f);
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  box-shadow:
    0 16px 48px rgba(200, 58, 43, 0.4),
    inset 0 2px 0 rgba(255,255,255,.15);
  transform: rotate(-3deg);
  animation: sealStamp 0.8s var(--ease-out) both;
}
@keyframes sealStamp {
  0% { transform: rotate(-3deg) scale(2); opacity: 0; }
  60% { transform: rotate(-3deg) scale(0.9); opacity: 1; }
  100% { transform: rotate(-3deg) scale(1); }
}
.seal-char {
  font-family: var(--font-display);
  font-size: 120px;
  color: var(--c-white);
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0,0,0,.2);
}
.seal-caption {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--c-gold);
  letter-spacing: 0.5em;
  padding-left: 0.5em;
}

/* 轮播指示器 */
.banner-indicators {
  position: absolute;
  right: 40px; top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 5;
}
.indicator {
  width: 3px; height: 32px;
  background: rgba(255,255,255,.25);
  border-radius: 2px;
  transition: all .3s var(--ease);
  cursor: pointer;
}
.indicator.active {
  background: var(--c-gold);
  height: 48px;
  box-shadow: 0 0 12px rgba(212, 160, 76, .5);
}
.indicator:hover { background: rgba(255,255,255,.5); }

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  left: 50%; bottom: 32px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 5;
  color: rgba(255,255,255,.5);
  font-size: 11px;
  letter-spacing: 0.3em;
  font-weight: 500;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(180deg, var(--c-gold), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* =========================================
   核心业务
   ========================================= */
.section-services {
  background: var(--c-bg);
  position: relative;
}
.section-services::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 80px;
  background: linear-gradient(180deg, var(--c-navy-dark), var(--c-bg));
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.service-card {
  position: relative;
  padding: 48px 36px;
  background: var(--c-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
  transition: all .4s var(--ease);
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  top: -100%; right: -50%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(212, 160, 76, 0.12), transparent 70%);
  border-radius: 50%;
  transition: all .6s var(--ease);
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(212, 160, 76, 0.3);
}
.service-card:hover::before {
  top: -20%; right: -10%;
}
.service-card.featured {
  background: linear-gradient(160deg, var(--c-navy) 0%, var(--c-navy-light) 100%);
  color: var(--c-white);
  border-color: transparent;
  transform: translateY(-12px);
}
.service-card.featured:hover { transform: translateY(-18px); }
.service-card.featured::before {
  background: radial-gradient(circle, rgba(212, 160, 76, 0.25), transparent 70%);
}
.service-card.featured .service-icon { color: var(--c-gold); }
.service-card.featured .service-list li { color: rgba(255,255,255,.78); }
.service-card.featured .service-link { color: var(--c-gold); }

.service-badge {
  position: absolute;
  top: 24px; right: 24px;
  padding: 4px 12px;
  font-size: 11px;
  background: var(--c-gold);
  color: var(--c-navy);
  border-radius: 100px;
  letter-spacing: 0.1em;
  font-weight: 500;
}
.service-icon {
  width: 56px; height: 56px;
  color: var(--c-gold);
  margin-bottom: 28px;
}
.service-icon svg { width: 100%; height: 100%; }
.service-card h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.01em;
}
.service-card p {
  color: var(--c-text-3);
  font-size: 15px;
  margin-bottom: 24px;
  line-height: 1.7;
}
.service-list {
  margin-bottom: 32px;
}
.service-list li {
  font-size: 14px;
  color: var(--c-text-2);
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
}
.service-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 14px;
  width: 6px; height: 6px;
  background: var(--c-gold);
  border-radius: 50%;
}
.service-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-navy);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap .25s var(--ease);
}
.service-link:hover { gap: 10px; color: var(--c-gold); }

/* =========================================
   15年数据
   ========================================= */
.section-stats {
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-navy-light) 100%);
  color: var(--c-white);
  position: relative;
  overflow: hidden;
}
.section-stats::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle 600px at 0% 0%, rgba(212, 160, 76, .12), transparent 50%),
    radial-gradient(circle 600px at 100% 100%, rgba(232, 98, 58, .08), transparent 50%);
}
.stats-wrap {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
}
.stats-intro { max-width: 480px; }
.stats-intro .section-desc { margin-bottom: 32px; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}
.stat-item {
  position: relative;
  padding: 32px 0;
  border-top: 1px solid rgba(255,255,255,.15);
}
.stat-num {
  font-family: var(--font-serif);
  font-size: 72px;
  font-weight: 700;
  color: var(--c-gold);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.stat-num::after {
  content: attr(data-suffix);
  font-size: 28px;
  color: var(--c-gold-light);
  font-weight: 500;
}
.stat-lbl {
  font-size: 15px;
  color: rgba(255,255,255,.7);
  letter-spacing: 0.05em;
}

/* =========================================
   GEO 优化
   ========================================= */
.section-geo {
  background: var(--c-bg);
}
.geo-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 80px;
}
.platform-tag {
  padding: 10px 20px;
  font-size: 14px;
  background: var(--c-white);
  color: var(--c-navy);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  font-weight: 500;
  transition: all .25s var(--ease);
}
.platform-tag:hover {
  background: var(--c-navy);
  color: var(--c-gold);
  border-color: var(--c-navy);
  transform: translateY(-2px);
}

.geo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.geo-text h3,
.geo-modules h3 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 20px;
  margin-top: 32px;
  position: relative;
  padding-left: 20px;
}
.geo-text h3:first-child,
.geo-modules h3:first-child { margin-top: 0; }
.geo-text h3::before,
.geo-modules h3::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 4px; height: 22px;
  background: var(--c-gold);
  border-radius: 2px;
}
.geo-text p {
  font-size: 15px;
  color: var(--c-text-3);
  line-height: 1.85;
  margin-bottom: 20px;
}
.geo-text strong { color: var(--c-navy); font-weight: 600; }

.compare-list {
  margin-top: 20px;
  border-top: 1px solid var(--c-border);
}
.compare-list li {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 14px;
}
.compare-key { color: var(--c-gold); font-weight: 600; }
.compare-val { color: var(--c-text-2); }

.module-list {
  counter-reset: mlist;
}
.module-list li {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--c-border);
  align-items: start;
}
.module-list li:last-child { border-bottom: none; }
.m-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--c-navy), var(--c-navy-light));
  color: var(--c-gold);
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  border-radius: 12px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(14, 42, 71, 0.15);
}
.module-list h4 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--c-navy);
  margin-bottom: 6px;
}
.module-list p {
  font-size: 14px;
  color: var(--c-text-3);
  line-height: 1.7;
}

/* =========================================
   短视频推广
   ========================================= */
.section-video {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-warm) 100%);
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 72px;
}
.video-card {
  position: relative;
  background: var(--c-white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
  transition: all .4s var(--ease);
  overflow: hidden;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(232, 98, 58, .3);
}
.video-platform {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  background: var(--c-navy);
  color: var(--c-gold);
  border-radius: 100px;
  margin-bottom: 20px;
  letter-spacing: 0.08em;
}
.video-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 12px;
}
.video-card p {
  font-size: 14px;
  color: var(--c-text-3);
  line-height: 1.7;
  margin-bottom: 16px;
}
.video-card ul li {
  font-size: 13px;
  color: var(--c-text-2);
  padding: 4px 0;
}

.video-cta {
  text-align: center;
  padding: 56px 40px;
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-navy-light) 100%);
  color: var(--c-white);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}
.video-cta::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle 400px at 10% 20%, rgba(212, 160, 76, .15), transparent 50%),
    radial-gradient(circle 400px at 90% 80%, rgba(232, 98, 58, .1), transparent 50%);
}
.video-cta h3 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
}
.video-cta p {
  color: rgba(255,255,255,.78);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* =========================================
   行业方案 3x2
   ========================================= */
.section-industries {
  background: var(--c-bg);
}
.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 28px;
}
.industry-card {
  position: relative;
  padding: 40px 32px;
  background: var(--c-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
  transition: all .4s var(--ease);
  overflow: hidden;
  min-height: 220px;
}
.industry-card::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-action));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s var(--ease);
}
.industry-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.industry-card:hover::after { transform: scaleX(1); }

.industry-num {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--c-gold);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.industry-card h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 8px;
}
.industry-card > p {
  font-size: 14px;
  color: var(--c-text-3);
  margin-bottom: 20px;
}
.industry-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.industry-keywords span {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--c-bg);
  color: var(--c-text-2);
  border-radius: 100px;
}

/* =========================================
   服务流程
   ========================================= */
.section-process {
  background: linear-gradient(180deg, var(--c-bg-warm) 0%, var(--c-bg) 100%);
}
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
}
.process-step {
  position: relative;
  text-align: center;
  padding: 32px 16px 24px;
  background: var(--c-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
  transition: all .3s var(--ease);
}
.process-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-gold);
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-light));
  color: var(--c-navy);
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 20px;
  box-shadow: 0 8px 20px rgba(212, 160, 76, 0.3);
  position: relative;
  z-index: 1;
}
.step-line {
  position: absolute;
  top: 60px;
  right: -20px;
  width: 20px;
  height: 2px;
  background: var(--c-border);
  z-index: 0;
}
.process-step:last-child .step-line { display: none; }
.process-step h4 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 8px;
}
.process-step p {
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.6;
}

/* =========================================
   FAQ
   ========================================= */
.section-faq {
  background: var(--c-bg);
}
.faq-actions {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}
.btn-text {
  color: var(--c-navy);
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all .25s var(--ease);
}
.btn-text:hover {
  background: var(--c-navy);
  color: var(--c-gold);
}
.faq-divider { color: var(--c-border); }

.faq-list {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--c-white);
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-gold);
  overflow: hidden;
  transition: all .3s var(--ease);
}
.faq-item:hover {
  box-shadow: var(--shadow-md);
}
.faq-item summary {
  padding: 20px 28px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .q {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--c-navy);
  flex: 1;
  line-height: 1.5;
}
.q-arrow {
  width: 24px; height: 24px;
  flex-shrink: 0;
  position: relative;
  border-radius: 50%;
  background: var(--c-bg);
  transition: all .3s var(--ease);
}
.q-arrow::before,
.q-arrow::after {
  content: "";
  position: absolute;
  background: var(--c-navy);
  transition: all .3s var(--ease);
}
.q-arrow::before {
  top: 11px; left: 6px; right: 6px;
  height: 2px;
}
.q-arrow::after {
  left: 11px; top: 6px; bottom: 6px;
  width: 2px;
}
.faq-item[open] .q-arrow {
  background: var(--c-gold);
  transform: rotate(180deg);
}
.faq-item[open] .q-arrow::before,
.faq-item[open] .q-arrow::after {
  background: var(--c-navy);
}
.faq-item[open] .q-arrow::after { opacity: 0; }
.faq-item[open] summary { padding-bottom: 12px; }

.faq-item .a {
  padding: 0 28px 24px;
  color: var(--c-text-2);
  font-size: 15px;
  line-height: 1.85;
}

/* =========================================
   关于铭赞
   ========================================= */
.section-about {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-warm) 100%);
}
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 80px;
  align-items: start;
}
.about-text p {
  color: var(--c-text-2);
  font-size: 15px;
  line-height: 1.85;
  margin-bottom: 18px;
}
.about-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}
.hl {
  text-align: center;
  padding: 20px 12px;
  background: var(--c-white);
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
}
.hl span {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-gold);
  margin-bottom: 4px;
}
.hl label {
  font-size: 12px;
  color: var(--c-text-3);
  letter-spacing: 0.05em;
}

.about-timeline {
  position: relative;
  padding-left: 32px;
}
.about-timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), transparent);
}
.tl-item {
  position: relative;
  padding: 0 0 28px;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: -32px; top: 8px;
  width: 14px; height: 14px;
  background: var(--c-white);
  border: 3px solid var(--c-gold);
  border-radius: 50%;
  z-index: 1;
}
.tl-item.current::before {
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(212, 160, 76, .25);
}
.tl-year {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 6px;
  display: block;
}
.tl-item p {
  color: var(--c-text-3);
  font-size: 14px;
  line-height: 1.7;
}

/* =========================================
   联系方式
   ========================================= */
.section-contact {
  background: var(--c-bg);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  background: var(--c-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  transition: all .3s var(--ease);
}
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-gold);
}
.ct-icon {
  width: 48px; height: 48px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--c-navy), var(--c-navy-light));
  color: var(--c-gold);
  border-radius: 12px;
}
.ct-icon svg { width: 22px; height: 22px; }
.ct-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.ct-label {
  font-size: 12px;
  color: var(--c-text-3);
  letter-spacing: 0.1em;
}
.ct-value {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--c-navy);
}
.ct-tip {
  font-size: 12px;
  color: var(--c-gold);
}

.contact-qr {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.qr-card {
  background: var(--c-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
}
.qr-img {
  width: 200px; height: 200px;
  margin: 0 auto 16px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-img img { width: 100%; height: 100%; object-fit: contain; }
.qr-label {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-navy);
  margin-bottom: 4px;
}
.qr-tip { font-size: 13px; color: var(--c-text-3); }

.company-card {
  background: linear-gradient(135deg, var(--c-navy), var(--c-navy-light));
  color: var(--c-white);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.company-card h4 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--c-gold);
}
.company-card > p {
  font-size: 12px;
  color: rgba(255,255,255,.6);
  margin-bottom: 16px;
}
.company-card ul li {
  font-size: 13px;
  color: rgba(255,255,255,.85);
  padding: 4px 0;
}

/* =========================================
   其他业务导航
   ========================================= */
.section-links {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-white) 100%);
  padding-top: 80px;
  padding-bottom: 80px;
}
.links-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  max-width: 1280px;
  margin: 0 auto;
}
.link-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 12px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--c-text-2);
  text-align: center;
  transition: all .3s var(--ease);
  min-height: 52px;
}
.link-item:hover {
  background: var(--c-navy);
  color: var(--c-gold);
  border-color: var(--c-navy);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* =========================================
   页脚
   ========================================= */
.footer {
  background: var(--c-navy-dark);
  color: var(--c-white);
  padding: 80px 0 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.footer-brand p {
  font-size: 13px;
  color: rgba(255,255,255,.6);
  margin-bottom: 4px;
}
.footer-since {
  margin-top: 16px;
  font-size: 12px;
  color: var(--c-gold) !important;
  letter-spacing: 0.1em;
}
.footer-col h5 {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-gold);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}
.footer-col a,
.footer-col p {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,.6);
  margin-bottom: 10px;
  line-height: 1.6;
}
.footer-col a:hover { color: var(--c-gold); }
.footer-weibo {
  display: inline-block !important;
  margin-top: 12px;
  padding: 6px 14px;
  background: rgba(212, 160, 76, .12);
  color: var(--c-gold) !important;
  border-radius: 100px;
  font-size: 12px !important;
}

.footer-qr-img {
  width: 100px; height: 100px;
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 8px;
}
.footer-qr-img img { width: 100%; height: 100%; object-fit: contain; }
.footer-qr p { font-size: 12px; color: rgba(255,255,255,.5); }

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: rgba(255,255,255,.5);
}
.footer-bottom a {
  color: rgba(255,255,255,.7);
  text-decoration: none;
  transition: color .25s var(--ease);
}
.footer-bottom a:hover { color: var(--c-gold); }

/* =========================================
   城市分站
   ========================================= */
.footer-cities {
  padding: 32px 0 24px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-cities-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-gold);
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}
.footer-cities-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-cities-list li {
  position: relative;
  padding: 0 14px;
  line-height: 1;
}
.footer-cities-list li::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 12px;
  background: rgba(255,255,255,.12);
}
.footer-cities-list li:last-child::after { display: none; }
.footer-cities-list a {
  font-size: 13px;
  color: rgba(255,255,255,.6);
  text-decoration: none;
  transition: color .25s var(--ease);
  white-space: nowrap;
}
.footer-cities-list a:hover { color: var(--c-gold); }

/* =========================================
   浮动按钮
   ========================================= */
.float-actions {
  position: fixed;
  right: 24px; bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 90;
}
.float-btn {
  width: 48px; height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-white);
  color: var(--c-navy);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--c-border);
  transition: all .3s var(--ease);
}
.float-btn svg { width: 20px; height: 20px; }
.float-btn:hover {
  background: var(--c-navy);
  color: var(--c-gold);
  transform: translateY(-2px);
}
.float-top {
  opacity: 0;
  pointer-events: none;
  transition: all .3s var(--ease);
}
.float-top.show {
  opacity: 1;
  pointer-events: auto;
}

/* =========================================
   滚动入场动画
   ========================================= */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* =========================================
   响应式
   ========================================= */
@media (max-width: 1199px) {
  .container { padding: 0 24px; }
  .section { padding: 80px 0; }
  .section-title { font-size: 36px; }
  .banner-title { font-size: 42px; }
  .banner-inner { gap: 40px; }
  .stats-wrap { gap: 40px; }
  .stat-num { font-size: 56px; }
  .ai-orbit { width: 380px; height: 380px; }
  .services-grid { gap: 20px; }
  .service-card { padding: 36px 28px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .links-grid { grid-template-columns: repeat(5, 1fr); }
  .nav-menu { gap: 22px; }
  .nav-menu a { font-size: 12px; }
  .nav-inner { gap: 20px; }
  .nav-cta { display: none; }
  .brand-slogan { font-size: 12px; letter-spacing: 0.08em; }
}

@media (max-width: 991px) {
  :root { --gap: 64px; }
  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(8, 26, 48, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    transform: translateX(100%);
    transition: transform .35s var(--ease);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    border-top: 1px solid rgba(255,255,255,.08);
  }
  .nav-menu.open { transform: translateX(0); }
  .nav-menu a {
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .nav-menu a::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-cta .nav-phone span,
  .nav-phone { font-size: 12px; padding: 6px 12px; }

  .banner-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
    padding-top: 120px;
  }
  .banner-title { font-size: 36px; }
  .banner-sub { font-size: 15px; }
  .banner-actions { justify-content: center; }
  .banner-meta { justify-content: center; flex-wrap: wrap; }
  .banner-art { min-height: 320px; }
  .ai-orbit { width: 320px; height: 320px; }
  .orbit-center { width: 90px; height: 90px; font-size: 28px; }
  .orbit-node { font-size: 12px; padding: 6px 12px; }
  .banner-indicators {
    right: 16px;
    top: auto; bottom: 24px; left: 16px;
    flex-direction: row;
    justify-content: center;
  }
  .indicator { width: 32px; height: 3px; }
  .indicator.active { width: 48px; height: 3px; }

  .services-grid { grid-template-columns: 1fr; }
  .service-card.featured { transform: none; }
  .service-card.featured:hover { transform: translateY(-4px); }

  .stats-wrap { grid-template-columns: 1fr; gap: 48px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }

  .geo-grid { grid-template-columns: 1fr; gap: 48px; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .industries-grid { grid-template-columns: 1fr 1fr; }
  .process-steps { grid-template-columns: 1fr 1fr; }
  .process-step:nth-child(odd) .step-line { display: none; }

  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-highlights { grid-template-columns: repeat(2, 1fr); }

  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .links-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 767px) {
  :root { --gap: 48px; }
  body { font-size: 14px; }
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 48px; }
  .section-title { font-size: 28px; }
  .eyebrow { font-size: 11px; margin-bottom: 14px; }
  .section-desc { font-size: 14px; }

  .nav-inner { gap: 16px; }
  .brand-name { font-size: 18px; }
  .brand-slogan { display: none; }
  .brand-divider { display: none; }
  .nav-cta .nav-phone { display: none; }

  .banner-track { height: auto; min-height: 100vh; }
  .banner-slide { height: auto; min-height: 100vh; padding: 100px 0 80px; }
  .banner-inner { padding-top: 40px; }
  .banner-eyebrow { font-size: 11px; padding: 4px 12px; }
  .banner-title { font-size: 28px; }
  .banner-sub { font-size: 14px; }
  .btn { padding: 12px 24px; font-size: 14px; }

  .banner-art { min-height: 280px; }
  .ai-orbit { width: 280px; height: 280px; }
  .orbit-center { width: 80px; height: 80px; font-size: 24px; }
  .orbit-node { font-size: 11px; padding: 5px 10px; }
  .phone-stack { height: 380px; }
  .phone-card.p1, .phone-card.p2, .phone-card.p3 { width: 180px; padding: 20px; }
  .phone-card.p1 { height: 220px; }
  .phone-card.p2 { height: 200px; }
  .phone-card.p3 { height: 200px; }
  .phone-num { font-size: 28px; }
  .seal-square { width: 160px; height: 160px; }
  .seal-char { font-size: 90px; }
  .seal-caption { font-size: 14px; }

  .stats-intro .section-title { font-size: 28px; }
  .stat-num { font-size: 44px; }
  .stat-num::after { font-size: 22px; }

  .geo-text h3, .geo-modules h3 { font-size: 22px; }
  .compare-list li { grid-template-columns: 1fr; gap: 4px; }

  .video-grid { grid-template-columns: 1fr; }
  .video-cta { padding: 40px 24px; }
  .video-cta h3 { font-size: 22px; }

  .industries-grid { grid-template-columns: 1fr; }
  .industry-card { padding: 32px 24px; min-height: auto; }

  .process-steps { grid-template-columns: 1fr; }
  .process-step .step-line { display: none; }

  .faq-item summary { padding: 16px 20px; }
  .faq-item .q { font-size: 15px; }
  .faq-item .a { padding: 0 20px 20px; font-size: 14px; }

  .about-highlights { grid-template-columns: 1fr 1fr; gap: 12px; }
  .contact-cards { grid-template-columns: 1fr; }
  .contact-card { padding: 20px; }
  .ct-value { font-size: 16px; }

  .links-grid { grid-template-columns: repeat(2, 1fr); }
  .link-item { padding: 12px 8px; font-size: 12px; min-height: 44px; }

  .footer { padding: 48px 0 24px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; padding-bottom: 32px; }
  .footer-cities { padding: 24px 0 20px; }
  .footer-cities-list { gap: 8px 0; }
  .footer-cities-list li { padding: 0 10px; }
  .footer-cities-list a { font-size: 12px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 6px; font-size: 11px; }

  .float-actions { right: 12px; bottom: 16px; }
  .float-btn { width: 40px; height: 40px; }
}

@media (max-width: 480px) {
  .banner-title { font-size: 24px; }
  .section-title { font-size: 24px; }
  .ai-orbit { width: 240px; height: 240px; }
  .orbit-center { width: 70px; height: 70px; font-size: 20px; }
  .orbit-node { font-size: 10px; padding: 4px 8px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}