/* 基础重置 */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: #fafbfc; /* 浅灰白底 */
  color: #1a2a3a;
  line-height: 1.6;
}

::selection { background: #f59e0b; color: #fff; }

/* 核心布局 — 必须居中 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; position: relative; }
.section:nth-child(even) { background: #f0f4f8; } /* 浅蓝灰 */

/* 导航 — 固定顶部，钻石切割透明感 */
.site-header {
  position: fixed;
  top: 0; left: 0; width: 100%;
  z-index: 1000;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid rgba(12,54,89,0.08);
  box-shadow: 0 1px 20px rgba(12,54,89,0.04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  text-decoration: none;
  color: #0c3659;
  letter-spacing: 0.5px;
}
.logo-icon {
  width: 40px; height: 40px;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, #0c3659 0%, #3b82f6 100%);
  color: #fff;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  transform: rotate(0deg);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: #1a2a3a;
  position: relative;
  padding: 4px 0;
  transition: color 0.3s;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #3b82f6, #f59e0b);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}
.main-nav a:hover { color: #0c3659; }
.main-nav a:hover::after { width: 100%; }
.nav-cta {
  padding: 10px 24px;
  border-radius: 100px;
  background: linear-gradient(135deg, #0c3659, #3b82f6);
  color: #fff !important;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(12,54,89,0.25);
  transition: all 0.3s;
}
.nav-cta::after { display: none; }
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(12,54,89,0.35);
}
.menu-toggle { display: none; }

/* 首页Hero — 钻石光芒背景 */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: 
    radial-gradient(circle at 20% 30%, rgba(59,130,246,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(245,158,11,0.06) 0%, transparent 50%),
    linear-gradient(135deg, #f8fafc 0%, #edf2f7 100%);
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(45deg, rgba(12,54,89,0.02) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(12,54,89,0.02) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(12,54,89,0.02) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(12,54,89,0.02) 75%);
  background-size: 40px 40px;
  opacity: 0.6;
  pointer-events: none;
}
.hero-content { max-width: 720px; position: relative; z-index: 1; }
.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 100px;
  background: linear-gradient(135deg, #3b82f6, #f59e0b);
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: 3.4rem;
  line-height: 1.1;
  margin-bottom: 20px;
  font-weight: 900;
  color: #0c3659;
  letter-spacing: -0.5px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, #f59e0b, #e67e22);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
}
.hero p {
  font-size: 1.15rem;
  opacity: 0.8;
  max-width: 560px;
  margin-bottom: 36px;
  color: #2c3e50;
}
.hero-buttons { display: flex; gap: 16px; }
.hero-image {
  border-radius: 0;
  overflow: hidden;
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  width: 420px; height: 420px;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  background: linear-gradient(135deg, #0c3659, #3b82f6);
  opacity: 0.12;
  z-index: 0;
}
.hero-image img { width: 100%; height: 100%; object-fit: cover; }

/* 按钮 — 钻石切面风格 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 0.95rem;
}
.btn-primary {
  background: linear-gradient(135deg, #0c3659 0%, #3b82f6 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(12,54,89,0.3);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(12,54,89,0.4);
}
.btn-outline {
  background: transparent;
  border: 2px solid #0c3659;
  color: #0c3659;
}
.btn-outline:hover {
  background: #0c3659;
  color: #fff;
  border-color: #0c3659;
}

/* 标签/标题 */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  margin-bottom: 16px;
  color: #3b82f6;
  text-transform: uppercase;
  position: relative;
  padding-left: 40px;
}
.section-label::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  width: 28px; height: 2px;
  background: linear-gradient(90deg, #3b82f6, #f59e0b);
  transform: translateY(-50%);
}
.section-title {
  font-size: 2.4rem;
  margin-bottom: 18px;
  font-weight: 800;
  color: #0c3659;
  letter-spacing: -0.3px;
}
.section-desc {
  max-width: 600px;
  opacity: 0.75;
  margin-bottom: 48px;
  font-size: 1.05rem;
}

/* 卡片网格 — 钻石切割卡片 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}
.category-card {
  border-radius: 16px;
  padding: 32px;
  background: #fff;
  border: 1px solid rgba(12,54,89,0.06);
  box-shadow: 0 2px 12px rgba(12,54,89,0.04);
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}
.category-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, #3b82f6, #f59e0b, #0c3659);
  opacity: 0;
  transition: opacity 0.4s;
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(12,54,89,0.1);
  border-color: transparent;
}
.category-card:hover::before { opacity: 1; }
.card-icon {
  width: 56px; height: 56px;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  background: linear-gradient(135deg, #edf2f7, #e2e8f0);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  color: #0c3659;
}
.card-link {
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  color: #3b82f6;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s;
}
.card-link:hover { gap: 12px; color: #0c3659; }

/* 特性块 */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.feature-image {
  border-radius: 0;
  overflow: hidden;
  position: relative;
  clip-path: polygon(10% 0%, 100% 0%, 90% 100%, 0% 100%);
  box-shadow: 0 8px 24px rgba(12,54,89,0.1);
}
.feature-image img { width: 100%; height: auto; display: block; }
.feature-text { }
.feature-list {
  list-style: none;
  margin-top: 16px;
}
.feature-list li {
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  border-bottom: 1px solid rgba(12,54,89,0.06);
}
.feature-list li:last-child { border-bottom: none; }
.feature-list li::before {
  content: '◆';
  font-weight: 700;
  color: #f59e0b;
  font-size: 0.9rem;
}

/* 数据条 — 钻石切割面统计 */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item {
  padding: 28px 16px;
  border-radius: 0;
  background: #fff;
  border: 1px solid rgba(12,54,89,0.08);
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  transition: all 0.3s;
  box-shadow: 0 2px 8px rgba(12,54,89,0.04);
}
.stat-item:hover {
  background: linear-gradient(135deg, #0c3659, #3b82f6);
  color: #fff;
  border-color: transparent;
  transform: scale(1.02);
}
.stat-item:hover .stat-number { color: #fff; }
.stat-item:hover .stat-label { color: rgba(255,255,255,0.8); }
.stat-number {
  font-size: 2.8rem;
  font-weight: 900;
  color: #0c3659;
  line-height: 1;
}
.stat-label {
  font-size: 0.9rem;
  opacity: 0.7;
  margin-top: 8px;
  font-weight: 500;
}

/* 内容墙 */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}
.content-wall-item {
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(12,54,89,0.06);
  transition: all 0.4s;
  box-shadow: 0 2px 12px rgba(12,54,89,0.04);
}
.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(12,54,89,0.1);
  border-color: transparent;
}
.content-wall-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}
.content-wall-body { padding: 24px; }
.content-wall-body h3 { font-size: 1.2rem; margin-bottom: 8px; color: #0c3659; }
.content-wall-body p { opacity: 0.7; font-size: 0.95rem; }

/* FAQ — 钻石开关 */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid rgba(12,54,89,0.1);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  transition: all 0.3s;
}
.faq-item:hover { border-color: #3b82f6; box-shadow: 0 2px 12px rgba(59,130,246,0.08); }
.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #0c3659;
  font-size: 1.05rem;
}
.faq-item .faq-question::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 300;
  color: #3b82f6;
  transition: transform 0.3s;
}
.faq-item.open .faq-question::after { content: '−'; transform: rotate(180deg); }
.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  opacity: 0.8;
  line-height: 1.7;
}
.faq-item.open .faq-answer { display: block; }

/* CTA横幅 — 钻石渐变 */
.cta-banner {
  padding: 72px 24px;
  text-align: center;
  border-radius: 20px;
  background: linear-gradient(135deg, #0c3659 0%, #3b82f6 50%, #f59e0b 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(45deg, rgba(255,255,255,0.03) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.03) 25%, transparent 25%);
  background-size: 60px 60px;
  pointer-events: none;
}
.cta-banner h2 {
  color: #fff;
  font-size: 2.4rem;
  margin-bottom: 16px;
}
.cta-banner p { color: rgba(255,255,255,0.85); max-width: 500px; margin: 0 auto 32px; }
.cta-banner .btn-primary {
  background: #fff;
  color: #0c3659;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

/* 页脚 — 深海钻石光泽 */
.site-footer {
  padding: 64px 0 32px;
  background: #0c3659;
  color: #a8c8e8;
}
.site-footer .container { }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand { }
.footer-brand .logo { color: #fff; }
.footer-col h4 { color: #fff; margin-bottom: 16px; font-size: 1rem; }
.footer-col a { color: #a8c8e8; text-decoration: none; display: block; padding: 4px 0; transition: color 0.3s; }
.footer-col a:hover { color: #f59e0b; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

/* 工具类 */
.text-accent { color: #f59e0b; }
.text-center { text-align: center; }
.seo-description { max-width: 600px; margin: 0 auto 48px; opacity: 0.75; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ⚠️ 响应式 */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.8rem; }
  .hero-image { width: 300px; height: 300px; }
}
@media (max-width: 768px) {
  .feature-block { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .main-nav.open { display: flex; flex-direction: column; gap: 16px; position: absolute; top: 72px; left: 0; width: 100%; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); padding: 24px; border-bottom: 1px solid rgba(12,54,89,0.08); }
  .hero { flex-direction: column; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero h1 { font-size: 2.4rem; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .hero-image { position: relative; right: auto; top: auto; transform: none; width: 240px; height: 240px; margin-top: 32px; opacity: 0.15; }
}
@media (max-width: 480px) {
  .cards-grid, .content-wall, .stats-bar { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .hero h1 { font-size: 2rem; }
  .section-title { font-size: 1.8rem; }
}