/* =============== GLOBAL RESET & BASE =============== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #001A57;
  --primary-dark: #001240;
  --accent: #2A7DE1;
  --accent-hover: #1E6BCF;
  --light: #F8F9FA;
  --gray: #6C757D;
  --dark: #212529;
  --success: #28a745;
  --white: #FFFFFF;
  --border: #E9ECEF;
}

body {
  font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: #fff;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  text-decoration: none;
  color: var(--accent);
  transition: color 0.3s;
}
a:hover { color: var(--accent-hover); }

.btn {
  display: inline-block;
  padding: 12px 28px;
  font-weight: 600;
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  border: none;
}
.btn-primary:hover {
  background: linear-gradient(135deg, #1E6BCF, #145AB5);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent);
  color: white;
}

.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-large { padding: 14px 32px; font-size: 18px; }

/* =============== HEADER =============== */
.site-header {
  background: var(--primary);
  padding: 16px 0;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo img {
  height: 40px;
}
.main-nav ul {
  display: flex;
  list-style: none;
  gap: 24px;
}
.main-nav a {
  color: white;
  font-weight: 500;
  font-size: 16px;
}
.main-nav .btn-primary {
  background: white;
  color: var(--primary);
}
.main-nav .btn-primary:hover {
  background: #f0f0f0;
}

/* =============== HERO =============== */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 120px 0 80px;
  text-align: center;
}
.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 16px;
  font-weight: 700;
}
.hero .subtitle {
  font-size: 1.4rem;
  max-width: 700px;
  margin: 0 auto 32px;
  opacity: 0.9;
}
.cta-group {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* =============== SECTION通用样式 =============== */
.section {
  padding: 80px 0;
}
.bg-light {
  background-color: var(--light);
}
.section h2 {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 50px;
  color: var(--primary);
}
.section h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--primary-dark);
}

/* =============== GRID LAYOUTS =============== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}
.card {
  background: white;
  padding: 32px;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.05);
  transition: transform 0.3s;
}
.card:hover {
  transform: translateY(-5px);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.product-item {
  background: white;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.product-item h3 {
  margin-bottom: 12px;
  color: var(--accent);
}

.account-cards {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.account-card {
  flex: 1;
  min-width: 300px;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0,0,0,0.05);
}
.account-card.standard { border-top: 4px solid #4CAF50; }
.account-card.edge { border-top: 4px solid var(--accent); }
.account-card h3 {
  padding: 20px 24px 12px;
  font-size: 1.4rem;
  margin: 0;
}
.account-card p {
  padding: 0 24px 16px;
  color: var(--gray);
}
.account-card ul {
  padding: 0 24px 20px;
  list-style-type: none;
}
.account-card li {
  margin-bottom: 8px;
  position: relative;
  padding-left: 20px;
}
.account-card li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: bold;
}

/* =============== STEPS & FAQ =============== */
.steps {
  counter-reset: step;
  list-style: none;
  max-width: 600px;
  margin: 0 auto;
}
.steps li {
  counter-increment: step;
  padding: 16px 0;
  border-bottom: 1px dashed var(--border);
  position: relative;
}
.steps li:before {
  content: counter(step);
  position: absolute;
  left: -32px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}
.steps li:last-child {
  border-bottom: none;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  margin-bottom: 24px;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.03);
}
.faq-item h3 {
  margin-bottom: 12px;
  color: var(--primary-dark);
}
.faq-item p {
  color: var(--gray);
}

/* =============== NEWS SECTION =============== */
.news-section {
  padding-bottom: 60px;
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 24px;
}
.news-card {
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.news-card time {
  display: block;
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 8px;
}
.news-card h3 {
  margin-bottom: 12px;
}
.news-card h3 a {
  color: var(--primary-dark);
}
.news-card p {
  color: var(--gray);
  font-size: 14px;
}

/* =============== FOOTER =============== */
.site-footer {
  background: var(--primary);
  color: white;
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  position: relative;
}
.footer-col h4:after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent);
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 12px;
}
.footer-col a {
  color: #ccc;
}
.footer-col a:hover {
  color: white;
}
.disclaimer {
  font-size: 13px;
  opacity: 0.8;
  margin-top: 12px;
}
.copyright {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 14px;
  opacity: 0.8;
}

/* =============== RESPONSIVE =============== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .hero .subtitle { font-size: 1.2rem; }
  .cta-group { flex-direction: column; align-items: center; }
  .main-nav ul { flex-direction: column; gap: 12px; }
  .section { padding: 60px 0; }
  .news-grid { grid-template-columns: 1fr; }
}