/* ===== 乐云SEO 分站通用样式 ===== */
:root {
  --primary: #1e40af;
  --primary-light: #3b82f6;
  --primary-dark: #1e3a8a;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --bg: #f8fafc;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
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;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
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: var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow); }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 68px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo {
  font-size: 22px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  letter-spacing: -0.5px;
}
.nav-logo span { font-weight: 400; font-size: 13px; color: var(--text-light); -webkit-text-fill-color: var(--text-light); margin-left: 6px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--text-light); transition: var(--transition); position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after { content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px; background: var(--primary); border-radius: 2px; }
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff !important; padding: 10px 22px; border-radius: 8px;
  font-weight: 600; font-size: 14px; transition: var(--transition);
  box-shadow: 0 4px 12px rgba(30,64,175,0.3);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(30,64,175,0.4); }
.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-menu-btn span { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; transition: var(--transition); }

/* ===== Hero ===== */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0e7490 100%);
  position: relative; overflow: hidden;
}
.hero::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(6,182,212,0.15) 0%, transparent 70%); border-radius: 50%; }
.hero::after { content: ''; position: absolute; bottom: -30%; left: -10%; width: 500px; height: 500px; background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%); border-radius: 50%; }
.hero-inner { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 0 24px; text-align: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  padding: 8px 20px; border-radius: 50px; color: rgba(255,255,255,0.9);
  font-size: 14px; font-weight: 500; margin-bottom: 28px; backdrop-filter: blur(10px);
}
.hero-badge .dot { width: 8px; height: 8px; background: #22c55e; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.hero h1 { font-size: 52px; font-weight: 800; color: #fff; line-height: 1.2; margin-bottom: 24px; letter-spacing: -1px; }
.hero h1 .highlight { background: linear-gradient(135deg, #22d3ee, #60a5fa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: 19px; color: rgba(255,255,255,0.75); max-width: 720px; margin: 0 auto 40px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, #06b6d4, #0891b2); color: #fff;
  padding: 16px 36px; border-radius: 10px; font-size: 16px; font-weight: 600;
  border: none; cursor: pointer; transition: var(--transition);
  box-shadow: 0 8px 24px rgba(6,182,212,0.4);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(6,182,212,0.5); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.1); color: #fff;
  padding: 16px 36px; border-radius: 10px; font-size: 16px; font-weight: 600;
  border: 1px solid rgba(255,255,255,0.3); cursor: pointer; transition: var(--transition);
  backdrop-filter: blur(10px);
}
.btn-outline:hover { background: rgba(255,255,255,0.2); border-color: rgba(255,255,255,0.5); }
.hero-stats { display: flex; justify-content: center; gap: 60px; margin-top: 64px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 4px; }
.hero-stat .label { font-size: 14px; color: rgba(255,255,255,0.6); }

/* ===== 通用区块 ===== */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-white); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block; background: linear-gradient(135deg, rgba(30,64,175,0.1), rgba(6,182,212,0.1));
  color: var(--primary); padding: 6px 18px; border-radius: 50px;
  font-size: 13px; font-weight: 600; margin-bottom: 16px; letter-spacing: 0.5px;
}
.section-title { font-size: 38px; font-weight: 800; color: var(--text); margin-bottom: 16px; letter-spacing: -0.5px; }
.section-desc { font-size: 17px; color: var(--text-light); max-width: 640px; margin: 0 auto; line-height: 1.8; }

/* ===== 服务卡片 ===== */
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card {
  background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 24px; transition: var(--transition); position: relative; overflow: hidden;
}
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent)); transform: scaleX(0); transition: var(--transition); }
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); border-color: transparent; }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 56px; height: 56px; background: linear-gradient(135deg, rgba(30,64,175,0.1), rgba(6,182,212,0.1));
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; color: var(--primary);
}
.service-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.service-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== 流程时间线 ===== */
.timeline { position: relative; max-width: 900px; margin: 0 auto; }
.timeline::before { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: linear-gradient(180deg, var(--primary), var(--accent)); transform: translateX(-50%); }
.timeline-item { display: flex; align-items: flex-start; margin-bottom: 48px; position: relative; }
.timeline-item:nth-child(odd) { flex-direction: row-reverse; }
.timeline-item:nth-child(odd) .timeline-content { text-align: right; padding-right: 60px; padding-left: 0; }
.timeline-item:nth-child(even) .timeline-content { padding-left: 60px; }
.timeline-dot {
  position: absolute; left: 50%; top: 8px; transform: translateX(-50%);
  width: 20px; height: 20px; background: var(--bg-white); border: 3px solid var(--primary);
  border-radius: 50%; z-index: 1; box-shadow: 0 0 0 6px rgba(30,64,175,0.1);
}
.timeline-content {
  flex: 1; background: var(--bg-white); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-sm); transition: var(--transition);
}
.timeline-content:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.timeline-step {
  display: inline-block; background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; width: 32px; height: 32px; border-radius: 50%; text-align: center;
  line-height: 32px; font-size: 14px; font-weight: 700; margin-bottom: 12px;
}
.timeline-content h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.timeline-content p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== 优势 ===== */
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.advantage-card {
  background: var(--bg-white); border-radius: var(--radius-lg); padding: 36px 28px;
  border: 1px solid var(--border); transition: var(--transition); position: relative;
}
.advantage-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }
.advantage-num { position: absolute; top: 24px; right: 28px; font-size: 48px; font-weight: 900; color: rgba(30,64,175,0.06); line-height: 1; }
.advantage-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 14px; color: var(--text); display: flex; align-items: center; gap: 10px; }
.advantage-card h3 .icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: #fff; flex-shrink: 0;
}
.advantage-card p { font-size: 15px; color: var(--text-light); line-height: 1.8; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 16px; overflow: hidden; transition: var(--transition); }
.faq-item:hover { border-color: var(--primary-light); }
.faq-question {
  padding: 22px 28px; cursor: pointer; display: flex; align-items: center;
  justify-content: space-between; font-size: 16px; font-weight: 600; color: var(--text);
  transition: var(--transition); user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question .arrow {
  width: 28px; height: 28px; background: rgba(30,64,175,0.08); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; transition: var(--transition);
  flex-shrink: 0; margin-left: 16px;
}
.faq-item.active .faq-question .arrow { transform: rotate(180deg); background: var(--primary); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease; padding: 0 28px; }
.faq-item.active .faq-answer { max-height: 300px; padding: 0 28px 24px; }
.faq-answer p { font-size: 15px; color: var(--text-light); line-height: 1.8; }

/* ===== 咨询表单 ===== */
.consult-section {
  padding: 90px 0; background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  position: relative; overflow: hidden;
}
.consult-section::before { content: ''; position: absolute; top: -50%; left: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(6,182,212,0.1) 0%, transparent 70%); border-radius: 50%; }
.consult-inner { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.consult-info h2 { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 20px; line-height: 1.3; }
.consult-info p { font-size: 16px; color: rgba(255,255,255,0.7); line-height: 1.8; margin-bottom: 32px; }
.consult-features { display: flex; flex-direction: column; gap: 16px; }
.consult-feature { display: flex; align-items: center; gap: 14px; color: rgba(255,255,255,0.85); font-size: 15px; }
.consult-feature .check {
  width: 24px; height: 24px; background: rgba(34,197,94,0.2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; color: #4ade80; flex-shrink: 0;
}
.consult-form-wrap {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-xl); padding: 40px; backdrop-filter: blur(20px);
}
.consult-form-wrap h3 { font-size: 22px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.consult-form-wrap .form-sub { font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: rgba(255,255,255,0.85); margin-bottom: 8px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 14px 16px; background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2); border-radius: 10px; color: #fff;
  font-size: 15px; font-family: inherit; transition: var(--transition); outline: none;
}
.form-group input::placeholder, .form-group textarea::placeholder { color: rgba(255,255,255,0.4); }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--accent); background: rgba(255,255,255,0.12); box-shadow: 0 0 0 3px rgba(6,182,212,0.2);
}
.form-group select option { background: #1e293b; color: #fff; }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit {
  width: 100%; padding: 16px; background: linear-gradient(135deg, #06b6d4, #0891b2);
  color: #fff; border: none; border-radius: 10px; font-size: 16px; font-weight: 600;
  cursor: pointer; transition: var(--transition); box-shadow: 0 8px 24px rgba(6,182,212,0.3);
}
.form-submit:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(6,182,212,0.4); }
.form-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.form-success { text-align: center; padding: 40px 20px; }
.form-success .success-icon {
  width: 72px; height: 72px; background: rgba(34,197,94,0.2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; color: #4ade80;
}
.form-success h3 { color: #fff; font-size: 22px; margin-bottom: 8px; }
.form-success p { color: rgba(255,255,255,0.7); font-size: 15px; }

/* ===== 页脚 ===== */
.footer { background: var(--bg-dark); padding: 60px 0 30px; color: rgba(255,255,255,0.7); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .footer-logo {
  font-size: 24px; font-weight: 800; background: linear-gradient(135deg, #60a5fa, #22d3ee);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 16px;
}
.footer-brand p { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,0.5); }
.footer-col h4 { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { font-size: 14px; color: rgba(255,255,255,0.5); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--accent-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-bottom a { color: rgba(255,255,255,0.4); font-size: 13px; transition: var(--transition); }
.footer-bottom a:hover { color: var(--accent-light); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .consult-inner { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: #fff; padding: 20px 24px; box-shadow: var(--shadow-lg); gap: 16px; }
  .hero { padding: 110px 0 70px; }
  .hero h1 { font-size: 34px; }
  .hero-subtitle { font-size: 16px; }
  .hero-stats { gap: 32px; }
  .hero-stat .num { font-size: 28px; }
  .section { padding: 60px 0; }
  .section-title { font-size: 28px; }
  .services-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .timeline::before { left: 20px; }
  .timeline-item, .timeline-item:nth-child(odd) { flex-direction: row; padding-left: 50px; }
  .timeline-item:nth-child(odd) .timeline-content, .timeline-item:nth-child(even) .timeline-content { text-align: left; padding-left: 20px; padding-right: 0; }
  .timeline-dot { left: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .consult-form-wrap { padding: 28px 20px; }
  .consult-info h2 { font-size: 28px; }
}

/* ===== 动画 ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }