/* ==================== 全局 ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #06b6d4;
  --text: #1e293b;
  --text-muted: #64748b;
  --bg: #f8fafc;
  --white: #ffffff;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(37,99,235,.10);
  --shadow-lg: 0 12px 48px rgba(37,99,235,.15);
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 16px rgba(37,99,235,.30);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,.40); }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--white); transform: translateY(-2px); }
.btn-white { background: var(--white); color: var(--primary); font-weight: 700; }
.btn-white:hover { background: #f0f6ff; transform: translateY(-2px); }
.btn-outline-white { background: transparent; color: var(--white); border-color: rgba(255,255,255,.6); }
.btn-outline-white:hover { background: rgba(255,255,255,.15); }

/* ==================== 导航 ==================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.08); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--primary);
}
.logo-icon { font-size: 22px; }
.logo-text { letter-spacing: -.5px; }

.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}
.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--text);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}
.nav-toggle:hover { background: var(--bg); }

/* ==================== Hero ==================== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1e40af 100%);
  position: relative;
  overflow: hidden;
  padding: 80px 0;
}
.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; }
.shape {
  position: absolute;
  border-radius: 50%;
  opacity: .12;
}
.shape1 { width: 600px; height: 600px; background: var(--accent); top: -200px; right: -100px; animation: float 8s ease-in-out infinite; }
.shape2 { width: 300px; height: 300px; background: #818cf8; bottom: -80px; left: 5%; animation: float 6s ease-in-out infinite reverse; }
.shape3 { width: 200px; height: 200px; background: var(--primary); top: 30%; left: 35%; animation: float 10s ease-in-out infinite; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(10deg); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-block;
  background: rgba(6,182,212,.2);
  color: var(--accent);
  border: 1px solid rgba(6,182,212,.4);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-text h1 {
  font-size: clamp(36px, 5vw, 58px);
  font-weight: 900;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.gradient-text {
  background: linear-gradient(90deg, #38bdf8, #818cf8, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-text p {
  font-size: 17px;
  color: rgba(255,255,255,.75);
  margin-bottom: 36px;
  max-width: 500px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; }
.stat strong { font-size: 28px; font-weight: 900; color: var(--white); }
.stat span { font-size: 13px; color: rgba(255,255,255,.55); margin-top: 2px; }

/* 设备 Mockup */
.hero-visual { display: flex; justify-content: center; align-items: center; }
.device-mockup {
  position: relative;
  width: 240px;
}
.device-body {
  background: linear-gradient(160deg, #1e293b, #0f172a);
  border-radius: 24px;
  padding: 24px;
  border: 2px solid rgba(255,255,255,.12);
  box-shadow: 0 30px 80px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.08);
}
.device-screen {
  background: linear-gradient(160deg, #0f172a, #1e3a5f);
  border-radius: 14px;
  padding: 32px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  border: 1px solid rgba(255,255,255,.06);
}
.wifi-animation { position: relative; width: 80px; height: 80px; display: flex; align-items: center; justify-content: center; }
.wifi-ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(37,99,235,.4);
  animation: pulse-ring 2.5s ease-out infinite;
}
.r1 { width: 40px; height: 40px; animation-delay: 0s; }
.r2 { width: 60px; height: 60px; animation-delay: .4s; }
.r3 { width: 80px; height: 80px; animation-delay: .8s; }
@keyframes pulse-ring {
  0% { transform: scale(.8); opacity: 1; }
  100% { transform: scale(1.4); opacity: 0; }
}
.wifi-icon { font-size: 28px; color: #60a5fa; position: relative; z-index: 1; }

.device-info { display: flex; flex-direction: column; align-items: center; gap: 10px; width: 100%; }
.signal-bar { display: flex; align-items: flex-end; gap: 3px; height: 16px; }
.signal-bar span {
  width: 5px;
  background: #34d399;
  border-radius: 2px;
  animation: signal 1.5s ease-in-out infinite alternate;
}
.signal-bar span:nth-child(1) { height: 5px; animation-delay: 0s; }
.signal-bar span:nth-child(2) { height: 9px; animation-delay: .2s; }
.signal-bar span:nth-child(3) { height: 13px; animation-delay: .4s; }
.signal-bar span:nth-child(4) { height: 16px; animation-delay: .6s; }
@keyframes signal { from { opacity: .4; } to { opacity: 1; } }

.network-name { font-size: 14px; font-weight: 700; color: var(--white); }
.speed-badge {
  background: rgba(37,99,235,.3);
  color: #93c5fd;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
}
.device-shadow {
  height: 20px;
  background: radial-gradient(ellipse, rgba(0,0,0,.4) 0%, transparent 70%);
  margin-top: 10px;
}

/* ==================== 通用区块 ==================== */
section { padding: 96px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; margin-bottom: 14px; color: var(--text); }
.section-header p { font-size: 17px; color: var(--text-muted); max-width: 500px; margin: 0 auto; }

/* ==================== Features ==================== */
.features { background: var(--white); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.feature-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
}
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-muted); font-size: 15px; line-height: 1.75; }

/* ==================== Plans ==================== */
.plans { background: var(--bg); }
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  align-items: start;
}
.plan-card {
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative;
  transition: var(--transition);
}
.plan-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.plan-popular {
  border-color: var(--primary);
  background: linear-gradient(160deg, #eff6ff, #fff);
  transform: scale(1.04);
}
.plan-popular:hover { transform: scale(1.04) translateY(-4px); }
.plan-badge {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--white);
  padding: 4px 18px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}
.plan-header { margin-bottom: 28px; }
.plan-name { font-size: 15px; font-weight: 700; color: var(--text-muted); display: block; margin-bottom: 8px; }
.plan-price { font-size: 48px; font-weight: 900; color: var(--primary); line-height: 1; }
.currency { font-size: 22px; vertical-align: top; padding-top: 8px; display: inline-block; }
.period { font-size: 16px; font-weight: 500; color: var(--text-muted); }
.plan-features { list-style: none; display: flex; flex-direction: column; gap: 12px; margin-bottom: 32px; }
.plan-features li { display: flex; align-items: center; gap: 10px; font-size: 15px; color: var(--text); }
.plan-features i { color: var(--primary); width: 18px; flex-shrink: 0; }
.plan-btn { width: 100%; justify-content: center; }

/* ==================== Scenarios ==================== */
.scenarios { background: var(--white); }
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.scenario-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  transition: var(--transition);
}
.scenario-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--primary-light); }
.scenario-icon { font-size: 48px; margin-bottom: 16px; display: block; }
.scenario-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.scenario-card p { color: var(--text-muted); font-size: 14px; line-height: 1.75; }

/* ==================== Testimonials ==================== */
.testimonials { background: var(--bg); }
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.testimonial-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.stars { color: #f59e0b; font-size: 18px; margin-bottom: 16px; }
.testimonial-card p { color: var(--text-muted); font-size: 15px; line-height: 1.8; margin-bottom: 24px; }
.reviewer { display: flex; align-items: center; gap: 14px; }
.avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--white);
  font-size: 17px;
  font-weight: 700;
  flex-shrink: 0;
}
.reviewer strong { display: block; font-size: 15px; }
.reviewer span { font-size: 13px; color: var(--text-muted); }

/* ==================== CTA ==================== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, #1e40af 50%, #0891b2 100%);
  padding: 80px 0;
}
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-text h2 { font-size: clamp(22px, 3vw, 34px); font-weight: 800; color: var(--white); margin-bottom: 12px; }
.cta-text p { color: rgba(255,255,255,.8); font-size: 16px; }
.cta-btns { display: flex; gap: 16px; flex-wrap: wrap; }

/* ==================== Contact ==================== */
.contact { background: var(--white); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; }
.contact-item i { font-size: 20px; color: var(--primary); margin-top: 3px; width: 24px; flex-shrink: 0; }
.contact-item strong { display: block; font-size: 15px; margin-bottom: 4px; }
.contact-item span { font-size: 14px; color: var(--text-muted); }

.qrcode-placeholder { margin-top: 8px; }
.qr-mock {
  width: 110px; height: 110px;
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
  border: 2px dashed var(--primary-light);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.qr-inner { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.qr-inner i { font-size: 32px; color: var(--primary); }
.qr-inner span { font-size: 11px; color: var(--text-muted); }

.contact-form { background: var(--bg); border-radius: var(--radius); padding: 40px; border: 1px solid var(--border); }
.contact-form h3 { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.form-group label { font-size: 14px; font-weight: 600; color: var(--text); }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.form-success {
  margin-top: 16px;
  padding: 14px 18px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  color: #16a34a;
  font-size: 14px;
  font-weight: 600;
}

/* ==================== Footer ==================== */
.footer { background: #0f172a; padding: 72px 0 0; }
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
}
.footer-brand .logo { color: var(--white); margin-bottom: 16px; }
.footer-brand p { color: rgba(255,255,255,.45); font-size: 14px; margin-bottom: 24px; }
.social-links { display: flex; gap: 14px; }
.social-links a {
  width: 38px; height: 38px;
  background: rgba(255,255,255,.08);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.6);
  font-size: 16px;
  transition: var(--transition);
}
.social-links a:hover { background: var(--primary); color: var(--white); transform: translateY(-3px); }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer-col h4 { font-size: 15px; font-weight: 700; color: var(--white); margin-bottom: 18px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,.45); margin-bottom: 12px; transition: color var(--transition); }
.footer-col a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 20px 24px;
  text-align: center;
}
.footer-bottom p { color: rgba(255,255,255,.3); font-size: 13px; }

/* ==================== Products Page ==================== */
.page-hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
  padding: 80px 0 60px;
  text-align: center;
}
.page-hero h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 900; color: var(--white); margin-bottom: 14px; }
.page-hero p { font-size: 17px; color: rgba(255,255,255,.65); max-width: 500px; margin: 0 auto; }

.products-section { background: var(--bg); padding: 80px 0; }
.filter-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.filter-tab {
  padding: 10px 24px;
  border-radius: 50px;
  border: 1.5px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  background: var(--white);
  color: var(--text-muted);
}
.filter-tab.active, .filter-tab:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-img {
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  background: linear-gradient(135deg, #f8fafc, #e2e8f0);
}
.product-body { padding: 24px; }
.product-tag {
  display: inline-block;
  padding: 3px 12px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  border-radius: 50px;
  margin-bottom: 12px;
}
.product-body h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.product-body p { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.7; }
.product-footer { display: flex; align-items: center; justify-content: space-between; }
.product-price { font-size: 22px; font-weight: 900; color: var(--primary); }
.product-price .orig { font-size: 14px; color: var(--text-muted); font-weight: 400; text-decoration: line-through; margin-left: 6px; }

/* ==================== About Page ==================== */
.about-section { background: var(--white); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-img-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-img-block {
  border-radius: 16px;
  aspect-ratio: 3/2;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
}
.about-img-block:nth-child(1) { background: linear-gradient(135deg, #dbeafe, #eff6ff); grid-row: span 2; aspect-ratio: auto; }
.about-img-block:nth-child(2) { background: linear-gradient(135deg, #d1fae5, #f0fdf4); }
.about-img-block:nth-child(3) { background: linear-gradient(135deg, #fce7f3, #fdf2f8); }
.about-text h2 { font-size: clamp(24px, 3vw, 36px); font-weight: 800; margin-bottom: 20px; }
.about-text p { color: var(--text-muted); font-size: 15px; line-height: 1.85; margin-bottom: 20px; }
.about-milestones { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; }
.milestone { background: var(--bg); padding: 20px; border-radius: 12px; border: 1px solid var(--border); }
.milestone strong { display: block; font-size: 26px; font-weight: 900; color: var(--primary); }
.milestone span { font-size: 13px; color: var(--text-muted); }

.team-section { background: var(--bg); padding: 80px 0; }
.team-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 24px; }
.team-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.team-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.team-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  font-size: 32px;
  font-weight: 700;
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
}
.team-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.team-card span { font-size: 13px; color: var(--text-muted); }

/* ==================== Compare Table ==================== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.compare-table th {
  background: var(--primary);
  color: var(--white);
  font-weight: 700;
  font-size: 15px;
}
.compare-table th:first-child { background: #1e40af; }
.compare-table td:first-child { text-align: left; font-weight: 600; color: var(--text-muted); background: var(--bg); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: #f0f6ff; }
.compare-table td:first-child:hover { background: var(--bg); }
.highlight-col { background: #eff6ff !important; }
.compare-table th.highlight-col { background: #1d4ed8 !important; }

.product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.product-specs span {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
  padding: 4px 10px;
  border-radius: 50px;
  border: 1px solid var(--border);
}
.product-specs i { color: var(--primary); font-size: 11px; }

/* ==================== Timeline ==================== */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 14px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  border-radius: 2px;
}
.timeline-item {
  position: relative;
  margin-bottom: 40px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -33px;
  top: 4px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--primary);
  z-index: 1;
}
.active-dot { background: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,.2); }
.timeline-content {
  background: var(--bg);
  border-radius: 12px;
  padding: 24px 28px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.timeline-content:hover { box-shadow: var(--shadow); border-color: var(--primary-light); }
.timeline-year {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 50px;
  margin-bottom: 10px;
}
.timeline-content h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.timeline-content p { font-size: 14px; color: var(--text-muted); line-height: 1.75; }

/* ==================== 响应式 ==================== */
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { order: -1; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-img-wrap { order: -1; }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--white); padding: 20px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); gap: 0; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav-links a:last-child { border-bottom: none; }
  .nav-toggle { display: block; }
  section { padding: 64px 0; }
  .hero { padding: 60px 0; min-height: auto; }
  .cta-inner { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero-stats { gap: 24px; }
  .plan-popular { transform: scale(1); }
  .plan-popular:hover { transform: translateY(-4px); }
  .footer-links { grid-template-columns: 1fr; }
  .plans-grid, .features-grid, .scenarios-grid, .testimonials-grid { grid-template-columns: 1fr; }
  .about-milestones { grid-template-columns: 1fr; }
  .timeline { padding-left: 28px; }
  .timeline-dot { left: -22px; }
  .timeline-content { padding: 18px 20px; }
  .compare-table th, .compare-table td { padding: 12px 10px; font-size: 13px; }
  .products-grid, .team-grid { grid-template-columns: 1fr; }
}