/* ===== CSS 变量 ===== */
:root {
  --color-primary: #0A4DFF;
  --color-secondary: #00B8FF;
  --color-dark: #0F172A;
  --color-dark-light: #1E293B;
  --color-accent: #FF4D4F;
  --color-white: #FFFFFF;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-400: #94A3B8;
  --color-gray-600: #64748B;
  --color-text: #334155;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 40px rgba(10, 77, 255, 0.15);
  --transition: 0.3s ease;
  --header-height: 72px;
  --container-width: 1200px;
}

/* ===== 重置与基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background: var(--color-white);
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 24px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 500; cursor: pointer;
  border: 2px solid transparent; transition: all var(--transition);
}
.btn-primary { background: var(--color-primary); color: var(--color-white); border-color: var(--color-primary); }
.btn-primary:hover { background: #0840D9; border-color: #0840D9; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-outline { background: transparent; color: var(--color-white); border-color: rgba(255,255,255,0.6); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: var(--color-white); }
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ===== 区块通用 ===== */
.section { padding: 80px 0; }
.section-dark { background: var(--color-dark); color: var(--color-white); }
.section-dark .section-desc { color: var(--color-gray-400); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-title { font-size: 36px; font-weight: 700; margin-bottom: 12px; }
.section-desc { font-size: 16px; color: var(--color-gray-600); }

/* ===== 入场动画 ===== */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== 导航栏 ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-height); transition: all var(--transition);
}
.header.scrolled {
  background: rgba(15, 23, 42, 0.95); backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; gap: 24px;
}
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon { display: flex; align-items: center; flex-shrink: 0; }
.header .logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-white); padding: 4px 6px;
  border-radius: var(--radius-sm);
}
.header .logo-icon img { height: 32px; }
.logo-icon img { height: 40px; width: auto; display: block; object-fit: contain; }
.logo-text { font-size: 18px; font-weight: 700; color: var(--color-white); white-space: nowrap; }
.nav { flex: 1; display: flex; justify-content: flex-end; min-width: 0; }
.nav-list { display: flex; align-items: center; justify-content: flex-end; gap: 2px; flex-wrap: nowrap; }
.nav-link {
  display: block; padding: 8px 10px; color: rgba(255,255,255,0.85);
  font-size: 14px; border-radius: var(--radius-sm); transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--color-white); background: rgba(10,77,255,0.3); }
.nav-dropdown { position: relative; }
.dropdown-menu {
  position: absolute; top: 100%; left: 0; min-width: 200px;
  background: var(--color-dark-light); border-radius: var(--radius-md);
  padding: 8px 0; opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: all var(--transition); box-shadow: var(--shadow-md);
}
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu a {
  display: block; padding: 10px 20px; color: rgba(255,255,255,0.8); font-size: 14px;
}
.dropdown-menu a:hover { color: var(--color-secondary); background: rgba(10,77,255,0.15); }
.header-cta { flex-shrink: 0; }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--color-white); transition: all var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Banner 轮播 ===== */
.banner { position: relative; height: 100vh; min-height: 600px; overflow: hidden; }
.banner-slider { height: 100%; position: relative; }
.banner-slide {
  position: absolute; inset: 0; opacity: 0; visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}
.banner-slide.active { opacity: 1; visibility: visible; }
.banner-bg {
  position: absolute; inset: 0;
  background: var(--color-dark);
}
.banner-bg-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
}
.banner-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.75) 45%, rgba(15, 23, 42, 0.35) 100%);
}
.particles { position: absolute; inset: 0; overflow: hidden; z-index: 1; }
.particle {
  position: absolute; width: 3px; height: 3px; border-radius: 50%;
  background: var(--color-secondary); opacity: 0.4;
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 0.6; }
  90% { opacity: 0.6; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}
.banner-content {
  position: relative; z-index: 2; height: 100%;
  display: flex; align-items: center;
  padding-top: var(--header-height);
  max-width: 640px;
}
.banner-text { width: 100%; }
.banner-title {
  font-size: 52px; font-weight: 800; color: var(--color-white);
  line-height: 1.2; margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #00B8FF 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.banner-subtitle { font-size: 20px; color: rgba(255,255,255,0.75); margin-bottom: 36px; line-height: 1.8; }
.banner-btns { display: flex; gap: 16px; flex-wrap: wrap; }

/* 正文图片通用 */
.content-img {
  width: 100%; height: 100%; display: block;
  object-fit: cover; border-radius: var(--radius-md);
}
.ai-img { max-width: 360px; margin: 0 auto; height: auto; aspect-ratio: 16/10; }

.banner-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 10;
  width: 48px; height: 48px; border-radius: 50%; border: none;
  background: rgba(255,255,255,0.1); color: #fff; font-size: 20px;
  cursor: pointer; transition: all var(--transition); backdrop-filter: blur(4px);
}
.banner-arrow:hover { background: rgba(10,77,255,0.5); }
.banner-prev { left: 24px; }
.banner-next { right: 24px; }
.banner-dots {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 10px; z-index: 10;
}
.banner-dot {
  width: 10px; height: 10px; border-radius: 50%; border: none;
  background: rgba(255,255,255,0.3); cursor: pointer; transition: all var(--transition);
}
.banner-dot.active { background: var(--color-secondary); width: 28px; border-radius: 5px; }

/* ===== 核心数据 ===== */
.advantages { background: var(--color-gray-100); }
.advantages .section-header { margin-bottom: 40px; }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  background: var(--color-white); border-radius: var(--radius-lg);
  padding: 40px; box-shadow: var(--shadow-lg); margin-bottom: 56px;
}
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 42px; font-weight: 800; color: var(--color-primary); line-height: 1.2; }
.stat-unit { font-size: 24px; }
.stat-label { display: block; font-size: 15px; color: var(--color-gray-600); margin-top: 8px; }

/* ===== 企业优势 ===== */
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.advantage-card {
  background: var(--color-white); border-radius: var(--radius-md);
  padding: 36px 28px; text-align: center;
  transition: all var(--transition); box-shadow: var(--shadow-sm);
}
.advantage-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.advantage-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
}
.advantage-icon img { width: 100%; height: 100%; object-fit: contain; display: block; }
.advantage-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: var(--color-dark); }
.advantage-card p { font-size: 14px; color: var(--color-gray-600); line-height: 1.7; }

/* ===== 核心产品 ===== */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md); padding: 32px 24px; text-align: center;
  transition: all var(--transition); cursor: pointer;
}
.product-card:hover {
  background: rgba(10,77,255,0.15); border-color: rgba(10,77,255,0.4);
  transform: translateY(-6px); box-shadow: 0 8px 30px rgba(10,77,255,0.2);
}
.product-icon { width: 56px; height: 56px; margin: 0 auto 16px; color: var(--color-secondary); }
.product-icon svg { width: 100%; height: 100%; }
.product-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.product-card p { font-size: 14px; color: var(--color-gray-400); margin-bottom: 16px; }
.product-link { color: var(--color-secondary); font-size: 14px; font-weight: 500; }
.product-link:hover { color: var(--color-white); }

/* ===== 行业解决方案 ===== */
.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.solution-card {
  border-radius: var(--radius-md); overflow: hidden;
  background: var(--color-white); box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.solution-img { height: 180px; overflow: hidden; }
.solution-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
.solution-card:hover .solution-img img { transform: scale(1.05); }
.solution-info { padding: 24px; }
.solution-info h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--color-dark); }
.solution-info p { font-size: 14px; color: var(--color-gray-600); margin-bottom: 12px; }
.solution-link { color: var(--color-primary); font-size: 14px; font-weight: 500; }
.solution-link:hover { color: var(--color-secondary); }

/* ===== 产品优势 ===== */
.advantage-visual { border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-lg); }
.advantage-visual .content-img { height: 100%; min-height: 280px; border-radius: 0; }
.advantage-split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.advantage-list { display: flex; flex-direction: column; gap: 20px; }
.advantage-item { display: flex; gap: 16px; align-items: flex-start; }
.adv-item-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: rgba(10,77,255,0.15); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; color: var(--color-secondary);
}
.adv-item-icon svg { width: 22px; height: 22px; }
.advantage-item h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.advantage-item p { font-size: 14px; color: var(--color-gray-400); }

/* ===== 平台能力 ===== */
.platform { position: relative; overflow: hidden; }
.platform-bg { position: absolute; inset: 0; pointer-events: none; }
.platform-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,184,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,184,255,0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 55%, #000 20%, transparent 75%);
}
.platform-glow { position: absolute; border-radius: 50%; filter: blur(90px); }
.platform-glow-1 {
  width: 480px; height: 480px; top: 10%; left: 50%;
  transform: translateX(-50%);
  background: rgba(10,77,255,0.18);
}
.platform-glow-2 {
  width: 360px; height: 360px; bottom: 5%; right: 8%;
  background: rgba(0,184,255,0.12);
}
.platform-wrap { position: relative; z-index: 1; }
.platform-label {
  display: block; font-size: 12px; letter-spacing: 5px;
  color: var(--color-secondary); margin-bottom: 12px; font-weight: 600;
}
.platform-hub {
  position: relative; width: 720px; height: 720px; margin: 0 auto;
  --hub-radius: 265px;
}
.hub-lines {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 1;
}
.hub-orbit {
  position: absolute; top: 50%; left: 50%;
  border-radius: 50%; transform: translate(-50%, -50%);
  pointer-events: none;
}
.hub-orbit-1 {
  width: calc(var(--hub-radius) * 2 + 20px); height: calc(var(--hub-radius) * 2 + 20px);
  border: 1px dashed rgba(0,184,255,0.22);
  animation: orbitSpin 50s linear infinite;
}
.hub-orbit-2 {
  width: calc(var(--hub-radius) * 2 + 120px); height: calc(var(--hub-radius) * 2 + 120px);
  border: 1px dashed rgba(10,77,255,0.15);
  animation: orbitSpin 70s linear infinite reverse;
}
.hub-orbit-3 {
  width: calc(var(--hub-radius) * 2 - 50px); height: calc(var(--hub-radius) * 2 - 50px);
  border: 1px solid rgba(0,184,255,0.08);
  animation: orbitSpin 35s linear infinite;
}
.hub-scan {
  position: absolute; top: 50%; left: 50%;
  width: calc(var(--hub-radius) * 2 - 50px); height: calc(var(--hub-radius) * 2 - 50px);
  transform: translate(-50%, -50%);
  border-radius: 50%; pointer-events: none; z-index: 1;
  background: conic-gradient(from 0deg, transparent 0deg, rgba(0,184,255,0.12) 30deg, transparent 60deg);
  animation: hubScan 4s linear infinite;
}
.hub-center {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 190px; height: 190px; z-index: 4;
}
.hub-center-ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 2px solid rgba(0,184,255,0.45);
  animation: centerRingPulse 2.5s ease-in-out infinite;
}
.hub-center-ring::before {
  content: ""; position: absolute; inset: -8px; border-radius: 50%;
  border: 1px solid rgba(0,184,255,0.15);
  animation: centerRingPulse 2.5s ease-in-out infinite reverse;
}
.hub-center-core {
  position: absolute; inset: 14px; border-radius: 50%;
  background: linear-gradient(145deg, #0A4DFF 0%, #0055EE 45%, #00B8FF 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  box-shadow: 0 0 50px rgba(10,77,255,0.55), 0 0 100px rgba(0,184,255,0.25), inset 0 0 30px rgba(255,255,255,0.08);
}
.hub-center-core strong { font-size: 22px; font-weight: 800; color: #fff; line-height: 1.3; }
.hub-center-core span { font-size: 13px; color: rgba(255,255,255,0.8); margin-top: 6px; letter-spacing: 1px; }
.hub-node {
  position: absolute; top: 50%; left: 50%; z-index: 3;
  transform: translate(-50%, -50%) rotate(var(--angle)) translateY(calc(-1 * var(--hub-radius))) rotate(calc(-1 * var(--angle)));
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(15,23,42,0.88); backdrop-filter: blur(10px);
  border: 1px solid rgba(0,184,255,0.35);
  border-radius: 10px; padding: 14px 22px;
  font-size: 15px; font-weight: 600; color: #fff; white-space: nowrap;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3), 0 0 20px rgba(0,184,255,0.1);
  transition: all var(--transition);
  animation: hubNodeGlow 3s ease infinite;
  animation-delay: var(--delay, 0s);
}
.hub-node-dot {
  display: block; width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: var(--color-secondary);
  box-shadow: 0 0 8px var(--color-secondary);
}
.hub-node:hover {
  border-color: rgba(0,184,255,0.85);
  box-shadow: 0 0 32px rgba(0,184,255,0.35), 0 4px 24px rgba(0,0,0,0.4);
  transform: translate(-50%, -50%) rotate(var(--angle)) translateY(calc(-1 * var(--hub-radius))) rotate(calc(-1 * var(--angle))) scale(1.06);
}
@keyframes orbitSpin { to { transform: translate(-50%, -50%) rotate(360deg); } }
@keyframes hubScan { to { transform: translate(-50%, -50%) rotate(360deg); } }
@keyframes centerRingPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.06); opacity: 0.7; }
}
@keyframes hubNodeGlow {
  0%, 100% { box-shadow: 0 4px 24px rgba(0,0,0,0.3), 0 0 16px rgba(0,184,255,0.08); }
  50% { box-shadow: 0 4px 24px rgba(0,0,0,0.3), 0 0 28px rgba(0,184,255,0.25); }
}

/* ===== AI 能力 ===== */
.ai-center { display: flex; justify-content: center; margin-bottom: 8px; }
.ai-layout { display: flex; flex-direction: column; align-items: center; gap: 48px; }
.ai-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; width: 100%; }
.ai-feature {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md); padding: 28px; text-align: center;
  transition: all var(--transition);
}
.ai-feature:hover { background: rgba(10,77,255,0.12); border-color: rgba(10,77,255,0.3); transform: translateY(-4px); }
.ai-f-icon { font-size: 32px; margin-bottom: 12px; }
.ai-feature h4 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.ai-feature p { font-size: 13px; color: var(--color-gray-400); }

/* ===== 服务流程 ===== */
.flow-steps {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; margin-bottom: 48px; flex-wrap: wrap;
}
.flow-step { text-align: center; padding: 20px; }
.flow-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; margin: 0 auto 12px;
}
.flow-step h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; color: var(--color-dark); }
.flow-step p { font-size: 13px; color: var(--color-gray-600); }
.flow-arrow { font-size: 24px; color: var(--color-primary); font-weight: 300; }
.service-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.service-card {
  position: relative; border-radius: var(--radius-md); overflow: hidden;
  height: 200px; cursor: pointer; transition: all var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.service-card-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
}
.service-card-content {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  justify-content: flex-end; padding: 24px;
  background: linear-gradient(transparent 30%, rgba(0,0,0,0.7));
}
.service-card-content h4 { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.service-card-content p { font-size: 13px; color: rgba(255,255,255,0.75); }

/* ===== 关于我们 ===== */
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 56px; align-items: center; }
.about-text p { font-size: 15px; color: var(--color-gray-600); margin-bottom: 16px; line-height: 1.8; }
.about-values { display: flex; flex-direction: column; gap: 16px; margin-top: 24px; }
.value-item { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.value-item strong {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 12px; background: var(--color-primary); color: #fff;
  border-radius: var(--radius-sm); font-size: 13px;
}
.value-item strong .value-en { font-weight: 400; font-size: 12px; color: #fff; }
.value-item > span { font-size: 14px; color: var(--color-text); line-height: 1.7; }
.about-building {
  height: 280px; border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-md);
}
.about-building img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
/* ===== 锚点偏移 ===== */
[id] { scroll-margin-top: calc(var(--header-height) + 16px); }

/* ===== 关于我们子模块 ===== */
.about-subtitle { font-size: 20px; font-weight: 600; color: var(--color-dark); margin-bottom: 20px; }
.about-values { margin-top: 24px; }
.about-values .about-subtitle { margin-bottom: 16px; }
.timeline .about-subtitle { margin-bottom: 12px; }
.timeline-slogan { font-size: 14px; color: var(--color-gray-500); margin-bottom: 28px; letter-spacing: 0.5px; }
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}
.timeline-item { position: relative; padding: 0 0 28px 24px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; left: -28px; top: 6px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--color-primary); border: 2px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-primary);
}
.timeline-head { font-size: 17px; font-weight: 700; color: var(--color-primary); margin-bottom: 8px; }
.timeline-desc { font-size: 15px; line-height: 1.8; color: var(--color-gray-600); }

/* ===== 联系我们 ===== */
.contact-wrap { max-width: 900px; margin: 0 auto; text-align: center; }
.contact-meta {
  display: flex; justify-content: center; gap: 48px;
  flex-wrap: wrap; margin-bottom: 40px;
}
.contact-map-section { width: 100%; }
.contact-address {
  font-size: 17px; font-weight: 500; color: var(--color-dark);
  margin-bottom: 20px; line-height: 1.6;
}
.amap-container {
  width: 100%; height: 360px;
  border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-md); background: var(--color-gray-100);
}
.amap-custom-marker {
  display: flex; flex-direction: column; align-items: center;
  position: relative; transform: translateY(-4px);
}
.amap-marker-label {
  display: inline-block; max-width: 240px; padding: 8px 14px;
  background: var(--color-primary); color: #fff;
  font-size: 13px; font-weight: 500; line-height: 1.4;
  text-align: center; white-space: nowrap;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(10, 77, 255, 0.35);
  margin-bottom: 10px; position: relative;
}
.amap-marker-label::after {
  content: ""; position: absolute; left: 50%; bottom: -6px; margin-left: -6px;
  border-left: 6px solid transparent; border-right: 6px solid transparent;
  border-top: 6px solid var(--color-primary);
}
.amap-marker-pin {
  width: 14px; height: 14px;
  background: var(--color-primary); border: 3px solid #fff;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(10, 77, 255, 0.4);
}
.amap-container .amap-info-close { display: none !important; }
.contact-item { margin-bottom: 0; }
.contact-item h4 { font-size: 16px; font-weight: 600; color: var(--color-dark); margin-bottom: 8px; }
.contact-item p { font-size: 15px; color: var(--color-gray-600); }
.contact-item a { color: var(--color-primary); transition: color var(--transition); }
.contact-item a:hover { color: var(--color-secondary); }
/* ===== 页脚 ===== */
.footer { background: var(--color-dark); color: rgba(255,255,255,0.7); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr) 1.2fr; gap: 24px; padding-bottom: 40px; }
.footer-desc { font-size: 14px; margin-top: 16px; line-height: 1.8; color: var(--color-gray-400); }
.footer-logo .logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-white); padding: 6px 10px;
  border-radius: var(--radius-sm);
}
.footer-logo .logo-icon img { height: 88px; width: auto; max-width: 280px; object-fit: contain; }
.footer-links h4, .footer-contact h4 { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; color: var(--color-gray-400); transition: color var(--transition); }
.footer-links a:hover { color: var(--color-secondary); }
.footer-contact p { font-size: 14px; margin-bottom: 8px; color: var(--color-gray-400); }
.footer-contact .footer-email { white-space: nowrap; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: var(--color-gray-400);
}
.footer-bottom a { color: var(--color-gray-400); }
.footer-bottom a + a { margin-left: 16px; }
.footer-bottom a:hover { color: var(--color-secondary); }

/* ===== 回到顶部 ===== */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 48px; height: 48px; border-radius: 50%; border: none;
  background: var(--color-primary); color: #fff; font-size: 20px;
  cursor: pointer; opacity: 0; visibility: hidden;
  transition: all var(--transition); box-shadow: var(--shadow-md);
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { background: #0840D9; transform: translateY(-4px); }

/* ===== 弹窗 ===== */
.modal {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: all var(--transition);
}
.modal.active { opacity: 1; visibility: visible; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-content {
  position: relative; background: var(--color-white); border-radius: var(--radius-md);
  max-width: 600px; width: 90%; padding: 32px; transform: scale(0.9);
  transition: transform var(--transition);
}
.modal.active .modal-content { transform: scale(1); }
.modal-close {
  position: absolute; top: 12px; right: 16px; background: none; border: none;
  font-size: 28px; color: var(--color-gray-600); cursor: pointer; line-height: 1;
}
.modal-close:hover { color: var(--color-dark); }
.modal-body { font-size: 16px; line-height: 1.8; color: var(--color-text); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .banner-title { font-size: 40px; }
  .advantages-grid, .products-grid, .solutions-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-split, .about-content { grid-template-columns: 1fr; }
  .service-cards { grid-template-columns: repeat(2, 1fr); }
  .ai-features { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-hub { width: 560px; height: 560px; --hub-radius: 205px; }
  .hub-center { width: 160px; height: 160px; }
  .hub-center-core strong { font-size: 18px; }
  .hub-scan { width: calc(var(--hub-radius) * 2 - 30px); height: calc(var(--hub-radius) * 2 - 30px); }
  .hub-node { font-size: 14px; padding: 12px 18px; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }
  .section { padding: 60px 0; }
  .section-title { font-size: 28px; }
  .nav {
    position: fixed; top: var(--header-height); left: 0; right: 0;
    background: rgba(15, 23, 42, 0.98); backdrop-filter: blur(12px);
    max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
  }
  .nav.open { max-height: calc(100vh - var(--header-height)); overflow-y: auto; }
  .nav-list { flex-direction: column; padding: 16px; gap: 0; }
  .nav-link { padding: 14px 16px; width: 100%; }
  .dropdown-menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    background: rgba(0,0,0,0.2); box-shadow: none; display: none;
  }
  .nav-dropdown.open .dropdown-menu { display: block; }
  .hamburger { display: flex; }
  .banner-content { max-width: 100%; text-align: center; justify-content: center; }
  .banner-title { font-size: 32px; }
  .banner-subtitle { font-size: 16px; }
  .banner-btns { justify-content: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); padding: 24px; }
  .stat-num { font-size: 32px; }
  .advantages-grid, .products-grid, .solutions-grid, .ai-features { grid-template-columns: 1fr; }
  .service-cards { grid-template-columns: 1fr; }
  .flow-steps { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-logo .logo-icon img { height: 72px; max-width: 240px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .platform-hub {
    width: 100%; height: auto; min-height: 0;
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px;
    padding: 0 4px;
  }
  .hub-lines, .hub-orbit, .hub-scan { display: none; }
  .hub-center {
    position: static; transform: none; width: 100%; height: auto;
    grid-column: 1 / -1; margin-bottom: 4px;
  }
  .hub-center-ring { display: none; }
  .hub-center-core {
    position: static; inset: auto; border-radius: var(--radius-md);
    padding: 20px; flex-direction: row; gap: 16px;
  }
  .hub-center-core strong { font-size: 18px; }
  .hub-node {
    position: static; transform: none !important;
    animation: none; justify-content: center;
  }
  .hub-node:hover { transform: none !important; }
  .banner-arrow { width: 36px; height: 36px; font-size: 16px; }
}

@media (max-width: 480px) {
  .banner-title { font-size: 26px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
}