/* ===== 基础 Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  background: var(--bg-primary); color: var(--text-main); overflow-x: hidden;
  /* ===== 防复制：禁用文本选中 ===== */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  /* iOS 长按呼出菜单 */
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}
/* 输入框和表单允许正常操作 */
input, textarea, select {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
  -webkit-touch-callout: default;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ===== CSS 变量 ===== */
:root {
  --brand-blue: #0099cc;
  --brand-purple: #6d28d9;
  --brand-grad: linear-gradient(135deg, #0099cc 0%, #6d28d9 100%);
  --bg-primary: #eaf3fa;
  --bg-secondary: #dfeef8;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-solid: #ffffff;
  --text-main: #1a2340;
  --text-muted: #5a6a8a;
  --border: rgba(0,153,204,.18);
}

/* ===== 顶部导航 ===== */
header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 999;
  backdrop-filter: blur(18px);
  background: rgba(234,243,250,.92);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 30px rgba(0,153,204,0.15);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px; height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--brand-grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 900; color: #fff;
}
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.logo-text span { background: var(--brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
nav { display: flex; gap: 36px; align-items: center; }
nav a { font-size: 14px; color: var(--text-muted); transition: color .25s; position: relative; }
nav a::after { content:''; position:absolute; bottom:-4px; left:0; width:0; height:2px; background: var(--brand-blue); transition: width .3s; }
nav a:hover { color: #1a2340; }
nav a:hover::after { width: 100%; }
nav a.active { color: #1a2340; }
nav a.active::after { width: 100%; }
.nav-cta {
  padding: 9px 22px; border-radius: 8px;
  background: var(--brand-grad); color: #fff !important;
  font-size: 14px; font-weight: 600; transition: opacity .25s;
}
.nav-cta:hover { opacity: .85; }
.nav-cta::after { display: none; }

/* ===== 汉堡菜单按钮 ===== */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all .3s;
}
.nav-hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Hero ===== */
#hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; padding-top: 68px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 20%, rgba(0,153,204,.10) 0%, transparent 65%),
    radial-gradient(ellipse 40% 40% at 80% 70%, rgba(109,40,217,.08) 0%, transparent 55%),
    radial-gradient(ellipse 30% 30% at 15% 60%, rgba(0,153,204,.06) 0%, transparent 50%),
    var(--bg-primary);
}
.hero-bg::before {
  content: '';
  position: absolute; inset: 0;
  background-image: none;
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 40%, transparent 100%);
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background-image: none;
  background-size: 150px 150px;
}
/* Hero 中央光晕脉冲 */
.hero-pulse-ring {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(0,212,255,0.12);
  animation: hero-ring-expand 4s ease-out infinite;
  z-index: 0;
}
.hero-pulse-ring:nth-child(1) { width: 300px; height: 300px; animation-delay: 0s; }
.hero-pulse-ring:nth-child(2) { width: 500px; height: 500px; animation-delay: 1.2s; }
.hero-pulse-ring:nth-child(3) { width: 700px; height: 700px; animation-delay: 2.4s; }
.hero-pulse-ring:nth-child(4) { width: 900px; height: 900px; animation-delay: 3.2s; border-color: rgba(124,58,237,0.08); }
@keyframes hero-ring-expand {
  0%   { transform: translate(-50%,-50%) scale(0.3); opacity: 0; }
  20%  { opacity: 1; }
  100% { transform: translate(-50%,-50%) scale(1); opacity: 0; }
}
.hero-content {
  position: relative; z-index: 2;
  display: flex; align-items: center; gap: 60px;
  max-width: 1200px; padding: 0 32px; margin: 0 auto;
  width: 100%;
}
.hero-text {
  flex: 1; max-width: 520px;
}
.hero-title {
  font-size: clamp(36px, 6vw, 72px); font-weight: 800;
  line-height: 1.1; letter-spacing: -1px; margin-bottom: 24px;
  text-align: left;
}
.hero-title .grad { background: var(--brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; white-space: nowrap; }
.hero-sub {
  font-size: clamp(15px, 2vw, 19px); color: var(--text-muted);
  line-height: 1.7; max-width: 520px; margin: 0 0 36px;
  text-align: left;
}
/* Hero 产品图轮播 */
.hero-showcase {
  flex: 1; max-width: 540px;
}
.hero-carousel {
  position: relative;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,.15), 0 0 80px rgba(0,212,255,.08);
  background: rgba(255,255,255,.6);
  backdrop-filter: blur(8px);
}
.hero-carousel-img {
  display: none;
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: contain;
  transition: opacity .6s ease;
}
.hero-carousel-img.active {
  display: block;
  animation: carousel-fade .6s ease;
}
@keyframes carousel-fade {
  0% { opacity: 0; transform: scale(1.02); }
  100% { opacity: 1; transform: scale(1); }
}
.hero-carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 16px;
}
.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(0,212,255,.25);
  cursor: pointer;
  transition: all .3s;
}
.carousel-dot.active {
  background: var(--brand-blue);
  width: 28px;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0,212,255,.5);
}
.carousel-dot:hover {
  background: rgba(0,212,255,.5);
}
.hero-btns { display: flex; gap: 16px; justify-content: flex-start; flex-wrap: wrap; }
.btn-primary {
  padding: 14px 36px; border-radius: 10px;
  background: var(--brand-grad); color: #fff; font-size: 15px; font-weight: 600;
  transition: transform .2s, box-shadow .2s;
  box-shadow: 0 8px 32px rgba(0,212,255,.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,212,255,.4); }
.btn-outline {
  padding: 14px 36px; border-radius: 10px;
  border: 1px solid rgba(0,212,255,.4); color: var(--brand-blue);
  font-size: 15px; font-weight: 600; transition: background .2s, border-color .2s;
}
.btn-outline:hover { background: rgba(0,212,255,.1); border-color: var(--brand-blue); }

/* 统计数字 */
.hero-stats {
  display: flex; justify-content: center; gap: 56px; margin-top: 64px; flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num { font-size: 36px; font-weight: 800; background: var(--brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ===== 页面顶部横幅 ===== */
.page-banner {
  min-height: 40vh; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; padding-top: 68px;
  text-align: center;
}
.page-banner-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 30%, rgba(0,153,204,.08) 0%, transparent 65%),
    radial-gradient(ellipse 40% 40% at 80% 60%, rgba(109,40,217,.06) 0%, transparent 55%),
    var(--bg-primary);
}
.page-banner-content { position: relative; z-index: 2; max-width: 700px; padding: 0 24px; }
.page-banner-title {
  font-size: clamp(28px, 5vw, 56px); font-weight: 800;
  line-height: 1.2; margin-bottom: 16px;
}
.page-banner-title .grad { background: var(--brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.page-banner-sub {
  font-size: 16px; color: var(--text-muted); line-height: 1.7;
}

/* ===== 通用 section ===== */
section { padding: 100px 0; position: relative; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.section-tag {
  display: inline-block; padding: 5px 16px; border-radius: 999px;
  background: rgba(0,212,255,.1); border: 1px solid rgba(0,212,255,.25);
  color: var(--brand-blue); font-size: 13px; font-weight: 600; margin-bottom: 16px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px); font-weight: 800;
  line-height: 1.2; margin-bottom: 16px;
}
.section-title .grad { background: var(--brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.section-sub { font-size: 16px; color: var(--text-muted); line-height: 1.7; max-width: 560px; }

section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: none;
  background-size: 80px 80px;
  pointer-events: none;
  z-index: 0;
}
section > * { position: relative; z-index: 1; }

/* ===== 产品系列 ===== */
#products {
  background:
    radial-gradient(ellipse 70% 50% at 80% 50%, rgba(109,40,217,.04) 0%, transparent 60%),
    var(--bg-secondary);
}
.products-header { text-align: center; margin-bottom: 64px; }
.products-header .section-sub { margin: 0 auto; }
.products-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }
.product-card {
  background: var(--bg-card); border-radius: 20px; overflow: hidden;
  border: 1px solid var(--border); transition: transform .3s, box-shadow .3s, border-color .3s;
  position: relative;
  backdrop-filter: blur(10px);
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 24px 60px rgba(0,0,0,.12);
  border-color: rgba(0,153,204,.4);
}
.product-card::before {
  content: ''; position: absolute; inset: 0; border-radius: 20px; z-index: 0;
  background: var(--brand-grad); opacity: 0; transition: opacity .3s;
}
.product-card:hover::before { opacity: .04; }
.product-img {
  height: 260px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  background: linear-gradient(145deg, #eef5fb, #e0ecf7);
}
.product-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s;
  position: relative; z-index: 1;
}
.product-card:hover .product-img img {
  transform: scale(1.05);
}
.img-fallback {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 10px;
  z-index: 0;
}
.img-fallback .f-icon { font-size: 52px; opacity: .7; }
.img-fallback .f-text { font-size: 14px; color: var(--text-muted); font-weight: 600; letter-spacing: 1px; }
.product-icon-wrap {
  width: 110px; height: 110px; border-radius: 28px;
  display: flex; align-items: center; justify-content: center;
  font-size: 52px; position: relative; z-index: 1;
  background: rgba(255,255,255,.85);
  border: 1px solid rgba(255,255,255,.6);
  box-shadow: 0 8px 32px rgba(0,0,0,.3);
}
.card-glow {
  position: absolute; width: 200px; height: 200px; border-radius: 50%;
  filter: blur(60px); opacity: .3;
}
.product-body { padding: 24px 28px 28px; position: relative; z-index: 1; }
.product-tag {
  display: inline-block; padding: 3px 12px; border-radius: 999px; font-size: 11px;
  font-weight: 700; letter-spacing: .5px; margin-bottom: 12px;
  text-transform: uppercase;
}
.tag-blue { background: rgba(0,212,255,.15); color: var(--brand-blue); }
.tag-purple { background: rgba(124,58,237,.2); color: #a78bfa; }
.tag-green { background: rgba(16,185,129,.15); color: #34d399; }
.product-name { font-size: 22px; font-weight: 700; margin-bottom: 10px; }
.product-desc { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.product-features { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.product-features li {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: #4a5a75;
}
.product-features li::before { content: '✓'; color: var(--brand-blue); font-weight: 700; flex-shrink: 0; }
.product-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 24px; font-size: 14px; font-weight: 600; color: var(--brand-blue);
  transition: gap .2s;
}
.product-link:hover { gap: 10px; }

/* ===== 产品交付方案 ===== */
.product-delivery {
  margin-top: 20px;
  padding: 16px;
  background: rgba(0,153,204,.04);
  border-radius: 10px;
  border: 1px dashed var(--border);
}
.delivery-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--brand-blue);
  margin-bottom: 10px;
}
.delivery-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.delivery-item {
  font-size: 12px;
  font-weight: 600;
  color: #1a2340;
  background: rgba(255,255,255,.7);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.delivery-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0;
}

/* ===== 特色优势 ===== */
#advantages {
  background:
    radial-gradient(ellipse 60% 60% at 20% 50%, rgba(0,153,204,.05) 0%, transparent 55%),
    radial-gradient(ellipse 50% 50% at 80% 50%, rgba(109,40,217,.05) 0%, transparent 55%),
    var(--bg-card-solid);
}
.adv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.adv-visual {
  position: relative; height: 480px; border-radius: 24px; overflow: hidden;
  background: linear-gradient(145deg, rgba(0,153,204,.08) 0%, rgba(109,40,217,.08) 100%);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
}
.circuit-svg { position: absolute; inset: 0; opacity: .25; }
.center-orb {
  width: 140px; height: 140px; border-radius: 50%;
  background: var(--brand-grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 56px; position: relative; z-index: 1;
  box-shadow: 0 0 80px rgba(0,212,255,.5);
  animation: orb-pulse 3s ease-in-out infinite;
}
@keyframes orb-pulse { 0%,100%{box-shadow:0 0 80px rgba(0,212,255,.4)} 50%{box-shadow:0 0 120px rgba(0,212,255,.7)} }
.orbit {
  position: absolute; border: 1px solid rgba(0,212,255,.2);
  border-radius: 50%; animation: spin linear infinite;
}
.orbit-1 { width: 220px; height: 220px; animation-duration: 8s; }
.orbit-2 { width: 320px; height: 320px; animation-duration: 14s; animation-direction: reverse; }
.orbit-3 { width: 420px; height: 420px; animation-duration: 20s; }
@keyframes spin { from{transform:rotate(0deg)} to{transform:rotate(360deg)} }
.orbit-dot {
  position: absolute; top: -5px; left: 50%; transform: translateX(-50%);
  width: 10px; height: 10px; border-radius: 50%; background: var(--brand-blue);
  box-shadow: 0 0 8px var(--brand-blue);
}
.adv-list { display: flex; flex-direction: column; gap: 28px; margin-top: 44px; }
.adv-item { display: flex; gap: 18px; align-items: flex-start; }
.adv-icon {
  width: 52px; height: 52px; border-radius: 14px; flex-shrink: 0;
  background: rgba(0,212,255,.1); border: 1px solid rgba(0,212,255,.2);
  display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.adv-text h4 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.adv-text p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

/* ===== 应用场景 ===== */
#scenarios {
  background:
    radial-gradient(ellipse 60% 40% at 50% 80%, rgba(0,153,204,.05) 0%, transparent 60%),
    var(--bg-secondary);
}
.scenarios-header { text-align: center; margin-bottom: 56px; }
.scenarios-header .section-sub { margin: 0 auto; }
.scenarios-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.scene-card {
  border-radius: 16px; padding: 36px 28px; position: relative; overflow: hidden;
  background: var(--bg-card); border: 1px solid var(--border);
  transition: transform .3s, border-color .3s;
  backdrop-filter: blur(10px);
}
.scene-card:hover { transform: translateY(-5px); border-color: rgba(0,212,255,.4); }
.scene-num {
  font-size: 56px; font-weight: 900; line-height: 1;
  background: var(--brand-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  opacity: .25; position: absolute; top: 16px; right: 20px;
}
.scene-icon { font-size: 36px; margin-bottom: 16px; }
.scene-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.scene-desc { font-size: 13px; color: var(--text-muted); line-height: 1.65; }

/* ===== 关于我们 ===== */
#about {
  background:
    radial-gradient(ellipse 70% 50% at 30% 40%, rgba(109,40,217,.04) 0%, transparent 55%),
    var(--bg-card-solid);
}
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-info { }
.about-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.about-tag {
  padding: 8px 20px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: rgba(0,212,255,.08); border: 1px solid rgba(0,212,255,.2); color: var(--brand-blue);
}
.about-milestones { display: flex; flex-direction: column; gap: 0; }
.milestone {
  display: flex; gap: 20px; align-items: flex-start; position: relative;
  padding-bottom: 32px;
}
.milestone:last-child { padding-bottom: 0; }
.milestone:not(:last-child)::after {
  content: ''; position: absolute; left: 20px; top: 44px; bottom: 0;
  width: 2px; background: var(--border);
}
.milestone-dot {
  width: 42px; height: 42px; border-radius: 50%; flex-shrink: 0;
  background: var(--brand-grad); display: flex; align-items: center; justify-content: center;
  font-size: 18px; box-shadow: 0 4px 16px rgba(0,212,255,.3); position: relative; z-index: 1;
}
.milestone-body h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.milestone-body p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.milestone-year { font-size: 11px; color: var(--brand-blue); font-weight: 600; margin-bottom: 4px; }

/* ===== 联系我们 ===== */
#contact {
  background:
    radial-gradient(ellipse 50% 50% at 70% 30%, rgba(0,153,204,.05) 0%, transparent 55%),
    var(--bg-secondary);
}
.contact-wrap {
  background: rgba(255,255,255,.9); border-radius: 24px;
  border: 1px solid var(--border); overflow: hidden;
}
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; }
.contact-info {
  padding: 56px 48px;
  background: linear-gradient(145deg, rgba(0,153,204,.08) 0%, rgba(109,40,217,.08) 100%);
  border-right: 1px solid var(--border);
}
.contact-info h3 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.contact-info p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 36px; }
.info-items { display: flex; flex-direction: column; gap: 20px; }
.info-item { display: flex; gap: 16px; align-items: flex-start; }
.info-icon {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  background: rgba(0,212,255,.1); border: 1px solid rgba(0,212,255,.2);
  display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.info-item h5 { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.info-item p { font-size: 14px; color: #1a2340; font-weight: 500; margin: 0; }
.contact-form { padding: 56px 48px; }
.contact-form h3 { font-size: 22px; font-weight: 700; margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 8px; }
input, textarea, select {
  width: 100%; padding: 12px 16px; border-radius: 10px;
  background: #f5f8fc; border: 1px solid #d0dae8;
  color: var(--text-main); font-size: 14px; font-family: inherit;
  transition: border-color .25s, box-shadow .25s; outline: none;
}
input:focus, textarea:focus, select:focus {
  border-color: rgba(0,153,204,.5);
  box-shadow: 0 0 0 3px rgba(0,153,204,.08);
}
textarea { resize: vertical; min-height: 100px; }
.submit-btn {
  width: 100%; padding: 14px; border-radius: 10px;
  background: var(--brand-grad); color: #fff; border: none;
  font-size: 15px; font-weight: 700; cursor: pointer;
  transition: opacity .2s, transform .2s;
  box-shadow: 0 8px 24px rgba(0,212,255,.25);
}
.submit-btn:hover { opacity: .9; transform: translateY(-1px); }

/* ===== Footer ===== */
footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border);
  padding: 56px 0 32px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand .logo-text { font-size: 18px; margin-bottom: 14px; display: block; }
.footer-brand p { font-size: 13px; color: var(--text-muted); line-height: 1.7; max-width: 260px; }
.footer-col h5 { font-size: 14px; font-weight: 700; margin-bottom: 16px; color: #1a2340; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 13px; color: var(--text-muted); transition: color .2s; }
.footer-col ul li a:hover { color: var(--brand-blue); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 12px; color: var(--text-muted); }
.footer-socials { display: flex; gap: 12px; }
.social-btn {
  width: 36px; height: 36px; border-radius: 8px;
  background: rgba(0,0,0,.05); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
  transition: background .2s, border-color .2s;
}
.social-btn:hover { background: rgba(0,153,204,.12); border-color: rgba(0,153,204,.3); }

/* ===== 滚动动画 ===== */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity .7s, transform .7s; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .nav-hamburger { display: flex; }
  nav {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(234,243,250,.98);
    backdrop-filter: blur(18px);
    padding: 24px 32px;
    gap: 20px;
    transform: translateY(-120%);
    transition: transform .35s ease;
    z-index: 998;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 20px 60px rgba(0,0,0,.1);
  }
  nav.nav-open { transform: translateY(0); }
  nav a { font-size: 16px; padding: 8px 0; }

  .hero-content { flex-direction: column; gap: 40px; padding: 0 24px; }
  .hero-text { max-width: 100%; }
  .hero-title { text-align: center; }
  .hero-sub { text-align: center; margin-left: auto; margin-right: auto; }
  .hero-btns { justify-content: center; }
  .hero-showcase { max-width: 100%; }
  .adv-grid, .about-grid, .contact-inner { grid-template-columns: 1fr; }
  .adv-visual { height: 300px; }
  .contact-info { border-right: none; border-bottom: 1px solid var(--border); }
  .contact-info, .contact-form { padding: 36px 28px; }
  .scenarios-grid { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .hero-stats { gap: 24px; }
  .hero-carousel-img { max-height: 240px; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .btn-primary, .btn-outline { padding: 12px 24px; font-size: 14px; }
  section { padding: 60px 0; }
  .container { padding: 0 20px; }
  .about-tags { gap: 8px; }
  .about-tag { padding: 6px 14px; font-size: 12px; }
  .hero-content { padding: 0 20px; }
  nav { padding: 20px; }
}