/* 172号卡分销官网 - 样式表 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1677FF;
  --primary-dark: #0958D9;
  --primary-light: #4096FF;
  --primary-bg: #E6F4FF;
  --success: #07C160;
  --danger: #FF4D4F;
  --warning: #FAAD14;
  --text: #1F2937;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;
  --bg: #FFFFFF;
  --bg-gray: #F9FAFB;
  --bg-light: #F3F4F6;
  --border: #E5E7EB;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 16px;
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s;
}
.navbar.scrolled { box-shadow: var(--shadow); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo-icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: white; font-weight: bold; font-size: 16px;
}
.nav-logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-logo-title { font-size: 18px; font-weight: 700; color: var(--text); }
.nav-logo-sub { font-size: 11px; color: var(--text-secondary); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
  font-size: 14px; color: var(--text-secondary); transition: color 0.2s;
  position: relative;
}
.nav-links a:hover { color: var(--primary); }
.nav-right { display: flex; align-items: center; gap: 12px; }
.btn-icon {
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border);
  background: white; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; color: var(--text-secondary);
}
.btn-icon:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white; border: none; padding: 9px 20px; border-radius: 8px;
  font-size: 14px; font-weight: 600; cursor: pointer; transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(22,119,255,0.4); }
.btn-outline {
  background: white; color: var(--primary); border: 1px solid var(--primary);
  padding: 9px 20px; border-radius: 8px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px;
}
.btn-outline:hover { background: var(--primary-bg); }
.mobile-menu-btn { display: none; }

/* ===== Hero区 ===== */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(180deg, #E6F4FF 0%, #F0F7FF 40%, #FFFFFF 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -100px; right: -100px; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(22,119,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute; bottom: -50px; left: -50px; width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(22,119,255,0.05) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-content { text-align: center; position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white; padding: 6px 16px; border-radius: 20px;
  font-size: 13px; font-weight: 500; margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(22,119,255,0.3);
}
.hero-title {
  font-size: 42px; font-weight: 800; color: var(--text);
  margin-bottom: 12px; letter-spacing: -0.5px;
}
.hero-title span {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 17px; color: var(--text-secondary); margin-bottom: 32px;
}
.hero-stats {
  display: flex; justify-content: center; gap: 40px; margin-bottom: 36px; flex-wrap: wrap;
}
.stat-card {
  background: white; padding: 20px 32px; border-radius: var(--radius);
  box-shadow: var(--shadow); text-align: center; min-width: 160px;
  border: 1px solid var(--border);
}
.stat-number {
  font-size: 28px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
.hero-invite-bar {
  display: inline-flex; align-items: center; gap: 16px;
  background: white; padding: 14px 24px; border-radius: var(--radius);
  box-shadow: var(--shadow); border-left: 4px solid var(--primary);
  margin-bottom: 28px; flex-wrap: wrap; justify-content: center;
}
.invite-label { font-size: 14px; color: var(--text-secondary); }
.invite-code {
  font-size: 24px; font-weight: 800; color: var(--primary);
  font-family: 'Courier New', monospace; letter-spacing: 2px;
}
.btn-copy {
  background: var(--primary-bg); color: var(--primary); border: none;
  padding: 6px 14px; border-radius: 6px; font-size: 13px; cursor: pointer;
  font-weight: 500; transition: all 0.2s;
}
.btn-copy:hover { background: var(--primary); color: white; }
.invite-divider { width: 1px; height: 28px; background: var(--border); }
.btn-scan {
  display: inline-flex; align-items: center; gap: 6px;
  background: white; color: var(--primary); border: 1px solid var(--primary);
  padding: 8px 16px; border-radius: 8px; font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all 0.2s;
}
.btn-scan:hover { background: var(--primary-bg); }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-buttons .btn-primary { padding: 14px 32px; font-size: 16px; }
.hero-buttons .btn-outline { padding: 14px 32px; font-size: 16px; }
.hero-note { font-size: 13px; color: var(--text-light); margin-top: 16px; }

/* ===== 通用区块 ===== */
.section { padding: 72px 0; }
.section-gray { background: var(--bg-gray); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
  font-size: 30px; font-weight: 800; color: var(--text); margin-bottom: 10px;
}
.section-subtitle { font-size: 15px; color: var(--text-secondary); }

/* ===== 平台优势 ===== */
.advantages-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.advantage-card {
  background: white; padding: 28px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); transition: all 0.3s;
}
.advantage-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}
.advantage-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary-bg), #BAE0FF);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 16px;
}
.advantage-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.advantage-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== 权威认证 ===== */
.auth-section { background: linear-gradient(180deg, #FFFFFF 0%, #F0F7FF 100%); }
.auth-operators {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 40px;
}
.operator-card {
  background: white; padding: 24px 20px; border-radius: var(--radius);
  text-align: center; border: 1px solid var(--border); transition: all 0.3s;
}
.operator-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.operator-icon {
  width: 48px; height: 48px; border-radius: 50%; margin: 0 auto 12px;
  display: flex; align-items: center; justify-content: center; font-size: 22px; color: white;
}
.op-mobile { background: linear-gradient(135deg, #0066CC, #3399FF); }
.op-unicom { background: linear-gradient(135deg, #E60012, #FF6666); }
.op-telecom { background: linear-gradient(135deg, #0066CC, #0099FF); }
.op-broadnet { background: linear-gradient(135deg, #7B2FF7, #A855F7); }
.operator-name { font-size: 16px; font-weight: 700; margin-bottom: 2px; }
.operator-en { font-size: 10px; color: var(--text-light); letter-spacing: 0.5px; }
.operator-tag { font-size: 12px; color: var(--primary); margin-top: 8px; font-weight: 500; }
.auth-badges {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 36px;
}
.auth-badge { text-align: center; }
.auth-badge-icon {
  width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 24px; box-shadow: 0 4px 12px rgba(22,119,255,0.3);
}
.auth-badge-title { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.auth-badge-desc { font-size: 12px; color: var(--text-secondary); }
.trust-bar {
  display: flex; justify-content: center; gap: 24px; flex-wrap: wrap;
  padding: 20px; background: white; border-radius: var(--radius);
  border: 1px solid var(--border);
}
.trust-item { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--text-secondary); }
.trust-item .check { color: var(--success); font-weight: bold; }

/* ===== 套餐佣金中心 ===== */
.package-toolbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px; flex-wrap: wrap; gap: 16px;
}
.package-filters { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-tag {
  padding: 8px 18px; border-radius: 20px; border: 1px solid var(--border);
  background: white; font-size: 14px; cursor: pointer; transition: all 0.2s;
  color: var(--text-secondary);
}
.filter-tag.active { background: var(--primary); color: white; border-color: var(--primary); }
.filter-tag.disabled { opacity: 0.5; cursor: not-allowed; }
.package-sort select {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; background: white; cursor: pointer;
}
.package-sort select:disabled { opacity: 0.5; cursor: not-allowed; }
.package-stats { font-size: 13px; color: var(--text-secondary); margin-bottom: 16px; }
.package-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  position: relative;
}
.package-card {
  background: white; border-radius: var(--radius-lg); border: 1px solid var(--border);
  overflow: hidden; transition: all 0.3s;
}
.package-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.package-header {
  padding: 16px 20px; display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--bg-light);
}
.package-operator {
  font-size: 12px; padding: 4px 10px; border-radius: 4px; color: white; font-weight: 600;
}
.op-tag-mobile { background: #0066CC; }
.op-tag-unicom { background: #E60012; }
.op-tag-telecom { background: #0066CC; }
.op-tag-broadnet { background: #7B2FF7; }
.package-name { font-size: 16px; font-weight: 700; }
.package-body { padding: 20px; }
.package-price-row {
  display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 16px;
}
.package-price { font-size: 24px; font-weight: 800; color: var(--text); }
.package-price span { font-size: 13px; font-weight: 400; color: var(--text-secondary); }
.package-commission { text-align: right; }
.commission-amount { font-size: 26px; font-weight: 800; color: var(--danger); }
.commission-label { font-size: 11px; color: var(--text-secondary); }
.package-details { font-size: 13px; color: var(--text-secondary); line-height: 2; }
.package-details div { display: flex; justify-content: space-between; }
.package-footer {
  padding: 14px 20px; border-top: 1px solid var(--bg-light);
}
.btn-package {
  width: 100%; padding: 10px; border-radius: 8px; border: 1px solid var(--primary);
  background: white; color: var(--primary); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.2s;
}
.btn-package:hover { background: var(--primary); color: white; }
.btn-package:disabled { opacity: 0.5; cursor: not-allowed; }

/* 套餐遮罩 */
.package-mask {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.8); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-lg); z-index: 10;
}
.mask-card {
  background: white; padding: 40px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); text-align: center; max-width: 420px;
}
.mask-icon { font-size: 48px; margin-bottom: 16px; }
.mask-title { font-size: 22px; font-weight: 800; margin-bottom: 12px; }
.mask-desc { font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; line-height: 1.8; }
.mask-code { font-size: 18px; font-weight: 700; color: var(--primary); margin: 12px 0; }
.mask-note { font-size: 12px; color: var(--text-light); margin-top: 12px; }

/* ===== 收益计算器 ===== */
.calculator-box {
  background: white; padding: 40px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow); border: 1px solid var(--border);
  max-width: 800px; margin: 0 auto;
}
.calc-row { margin-bottom: 28px; }
.calc-label {
  display: flex; justify-content: space-between; margin-bottom: 10px;
  font-size: 15px; font-weight: 600;
}
.calc-value { color: var(--primary); font-size: 18px; font-weight: 800; }
.calc-slider {
  width: 100%; height: 8px; -webkit-appearance: none; appearance: none;
  background: var(--bg-light); border-radius: 4px; outline: none;
}
.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--primary); cursor: pointer;
  box-shadow: 0 2px 8px rgba(22,119,255,0.4);
}
.calc-results {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px;
}
.result-card {
  background: var(--bg-gray); padding: 20px; border-radius: var(--radius); text-align: center;
}
.result-card.highlight { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; }
.result-amount { font-size: 24px; font-weight: 800; margin-bottom: 4px; }
.result-label { font-size: 12px; opacity: 0.8; }
.calc-tip { text-align: center; font-size: 13px; color: var(--text-secondary); margin-top: 16px; }

/* ===== 加盟流程 ===== */
.steps {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  position: relative;
}
.step-card {
  text-align: center; padding: 32px 24px; background: white;
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  position: relative;
}
.step-number {
  position: absolute; top: -20px; left: 50%; transform: translateX(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white; font-size: 20px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(22,119,255,0.3);
}
.step-icon { font-size: 36px; margin-bottom: 16px; margin-top: 12px; }
.step-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.step-code {
  display: inline-block; margin-top: 10px; padding: 4px 12px;
  background: var(--primary-bg); color: var(--primary);
  border-radius: 4px; font-size: 13px; font-weight: 600;
}

/* ===== 一级代理权益 ===== */
.benefits-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.benefits-list { list-style: none; }
.benefits-list li {
  display: flex; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--bg-light);
  font-size: 15px;
}
.benefits-list li:last-child { border-bottom: none; }
.benefit-check { color: var(--success); font-weight: bold; flex-shrink: 0; }
.compare-table {
  width: 100%; border-collapse: collapse; background: white;
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.compare-table th, .compare-table td {
  padding: 14px 16px; text-align: center; font-size: 14px;
  border-bottom: 1px solid var(--bg-light);
}
.compare-table th {
  background: var(--primary); color: white; font-weight: 600;
}
.compare-table th:first-child { text-align: left; background: var(--primary-dark); }
.compare-table td:first-child { text-align: left; font-weight: 500; }
.compare-table .yes { color: var(--success); font-weight: bold; }
.compare-table .no { color: var(--text-light); }

/* ===== 代理见证 ===== */
.testimonials {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.testimonial-card {
  background: white; padding: 28px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); transition: all 0.3s;
}
.testimonial-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.testimonial-header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.testimonial-avatar {
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white; display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700;
}
.testimonial-info { flex: 1; }
.testimonial-name { font-size: 15px; font-weight: 700; }
.testimonial-role { font-size: 12px; color: var(--text-secondary); }
.testimonial-stars { color: var(--warning); font-size: 13px; }
.testimonial-text { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }
.testimonial-income {
  display: inline-block; padding: 4px 12px; background: #FFF7E6;
  color: var(--warning); border-radius: 4px; font-size: 12px; font-weight: 600;
}

/* ===== APP下载 ===== */
.app-download-wrap {
  max-width: 900px; margin: 0 auto;
}
.app-cards {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 32px;
}
.app-card {
  display: flex; align-items: center; gap: 20px; padding: 28px;
  border-radius: var(--radius-lg); cursor: pointer; transition: all 0.3s;
  text-decoration: none; color: white;
}
.app-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.app-card.android { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
.app-card.ios { background: linear-gradient(135deg, #1D1D1F, #2C2C2E); }
.app-icon {
  width: 60px; height: 60px; border-radius: 50%; background: white;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; flex-shrink: 0;
}
.app-text { flex: 1; }
.app-title { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.app-sub { font-size: 13px; opacity: 0.8; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: white; border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 12px; overflow: hidden; transition: all 0.3s;
}
.faq-item.active { border-color: var(--primary-light); box-shadow: var(--shadow); }
.faq-question {
  padding: 18px 24px; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center; font-size: 15px; font-weight: 600;
}
.faq-arrow { transition: transform 0.3s; color: var(--text-secondary); font-size: 12px; }
.faq-item.active .faq-arrow { transform: rotate(180deg); color: var(--primary); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
  padding: 0 24px; font-size: 14px; color: var(--text-secondary); line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ===== 底部CTA ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 72px 0; color: white;
}
.cta-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.cta-trust {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  font-size: 13px; opacity: 0.9; margin-bottom: 20px;
}
.cta-title { font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.cta-subtitle { font-size: 16px; opacity: 0.9; margin-bottom: 20px; }
.cta-code-bar {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(255,255,255,0.15); padding: 10px 20px; border-radius: 8px;
  margin-bottom: 24px;
}
.cta-code-label { font-size: 13px; opacity: 0.9; }
.cta-code { font-size: 20px; font-weight: 800; font-family: monospace; }
.cta-btn {
  background: white; color: var(--primary); border: none;
  padding: 16px 36px; border-radius: 10px; font-size: 17px; font-weight: 700;
  cursor: pointer; transition: all 0.2s; display: inline-flex; align-items: center; gap: 8px;
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.2); }
.cta-tags { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.cta-tag {
  padding: 4px 12px; background: rgba(255,255,255,0.2); border-radius: 4px;
  font-size: 12px;
}
.cta-note { font-size: 13px; opacity: 0.8; margin-top: 16px; }
/* 扫码卡片 */
.qr-card {
  background: white; border-radius: var(--radius-lg); padding: 32px;
  text-align: center; box-shadow: var(--shadow-lg);
}
.qr-card-title { font-size: 22px; font-weight: 800; color: var(--text); margin-bottom: 6px; }
.qr-card-sub {
  font-size: 14px; color: var(--text-secondary); margin-bottom: 24px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.qr-code-img {
  width: 320px; height: 320px; margin: 0 auto; padding: 12px;
  background: white; border: 1px solid var(--border); border-radius: 12px;
}
.qr-code-img img { width: 100%; height: 100%; object-fit: contain; }
.qr-card-code {
  font-size: 16px; font-weight: 700; color: var(--primary); margin-top: 20px;
}
.qr-card-desc { font-size: 13px; color: var(--text-secondary); margin-top: 6px; }

/* ===== 页脚 ===== */
.footer { background: #1F2937; color: #9CA3AF; padding: 56px 0 24px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 32px;
  margin-bottom: 40px;
}
.footer-brand h3 { color: white; font-size: 18px; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; line-height: 1.8; margin-bottom: 12px; }
.footer-security {
  font-size: 12px; color: #6B7280; padding: 8px 12px;
  background: rgba(255,255,255,0.05); border-radius: 6px; display: inline-block;
}
.footer-col h4 { color: white; font-size: 15px; margin-bottom: 16px; font-weight: 600; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 13px; color: #9CA3AF; transition: color 0.2s; }
.footer-col a:hover { color: white; }
.footer-contact-item {
  font-size: 13px; margin-bottom: 10px; display: flex; align-items: center; gap: 8px;
}
.footer-contact-item .copy-btn {
  background: rgba(255,255,255,0.1); border: none; color: #9CA3AF;
  padding: 2px 8px; border-radius: 4px; font-size: 11px; cursor: pointer;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px;
  text-align: center; font-size: 12px; color: #6B7280; line-height: 2;
}
.footer-domain { color: #D1D5DB; font-weight: 500; }
.footer-disclaimer { margin-top: 8px; font-size: 11px; color: #4B5563; }

/* ===== 客服浮层 ===== */
.contact-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 2000;
  display: none; align-items: center; justify-content: center;
}
.contact-overlay.show { display: flex; }
.contact-modal {
  background: white; border-radius: var(--radius-lg); padding: 32px;
  max-width: 400px; width: 90%; position: relative;
  animation: modalIn 0.3s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
.contact-close {
  position: absolute; top: 16px; right: 16px; background: none; border: none;
  font-size: 20px; cursor: pointer; color: var(--text-secondary);
}
.contact-title { font-size: 20px; font-weight: 800; margin-bottom: 20px; }
.contact-item {
  display: flex; align-items: center; gap: 12px; padding: 14px 0;
  border-bottom: 1px solid var(--bg-light);
}
.contact-item:last-child { border-bottom: none; }
.contact-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--primary-bg); display: flex; align-items: center;
  justify-content: center; font-size: 18px; flex-shrink: 0;
}
.contact-info { flex: 1; }
.contact-label { font-size: 12px; color: var(--text-secondary); }
.contact-value { font-size: 15px; font-weight: 600; }

/* ===== Toast ===== */
.toast {
  position: fixed; top: 80px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.8); color: white; padding: 10px 24px;
  border-radius: 8px; font-size: 14px; z-index: 3000;
  opacity: 0; transition: opacity 0.3s; pointer-events: none;
}
.toast.show { opacity: 1; }

/* ===== 滚动动画 ===== */
.fade-in {
  opacity: 0; transform: translateY(20px); transition: all 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: flex; }
  .hero-title { font-size: 30px; }
  .hero-stats { gap: 16px; }
  .stat-card { min-width: 120px; padding: 16px; }
  .stat-number { font-size: 22px; }
  .advantages-grid, .package-grid, .testimonials { grid-template-columns: 1fr; }
  .auth-operators { grid-template-columns: repeat(2, 1fr); }
  .auth-badges { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .benefits-wrap { grid-template-columns: 1fr; }
  .app-cards { grid-template-columns: 1fr; }
  .cta-wrap { grid-template-columns: 1fr; }
  .qr-code-img { width: 280px; height: 280px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .calc-results { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .section-title { font-size: 24px; }
}
@media (max-width: 600px) {
  .hero-title { font-size: 26px; }
  .hero-invite-bar { flex-direction: column; gap: 12px; }
  .invite-divider { display: none; }
  .auth-operators { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-title { font-size: 24px; }
  .qr-code-img { width: 260px; height: 260px; }
  .calculator-box { padding: 24px; }
}