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

:root {
  --bg: #0a0e1a;
  --bg-2: #111827;
  --surface: #1a1f36;
  --surface-2: #232946;
  --text: #e8eaf0;
  --text-2: #9ca3af;
  --text-3: #6b7280;
  --primary: #0066FF;
  --primary-light: #3b82f6;
  --orange: #FF6A00;
  --purple: #7C3AED;
  --border: rgba(255,255,255,0.08);
  --radius: 16px;
}

html { scroll-behavior:smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color:inherit; text-decoration:none; }
ul { list-style:none; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top:0; left:0; right:0; z-index:100;
  padding: 16px 0;
  transition: all 0.3s ease;
  background: transparent;
}
.navbar.scrolled {
  background: rgba(10,14,26,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

.nav-container {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 18px; font-weight: 700; color: var(--text);
}
.logo-icon { color: var(--primary); font-size: 22px; }

.nav-menu {
  display: flex; gap: 32px;
}
.nav-link {
  font-size: 15px; color: var(--text-2);
  transition: color 0.2s;
  position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--primary);
  transition: width 0.3s;
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span {
  width: 24px; height: 2px; background: var(--text);
  transition: all 0.3s;
}

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute; inset: 0; z-index: 0;
}
.hero-particles {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0,102,255,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(124,58,237,0.12) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(255,106,0,0.08) 0%, transparent 60%);
}
.hero-gradient {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 0%, var(--bg) 100%);
}

.hero-content {
  position: relative; z-index: 1;
  text-align: center; padding: 0 24px;
  max-width: 800px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px; color: var(--text-2);
  margin-bottom: 24px;
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: 56px; font-weight: 800;
  line-height: 1.2; letter-spacing: -1px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #9ca3af 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.accent {
  background: linear-gradient(135deg, var(--primary) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 16px; color: var(--text-2);
  line-height: 1.8; margin-bottom: 36px;
}

.hero-actions {
  display: flex; gap: 16px; justify-content: center;
  margin-bottom: 60px;
}

.btn {
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 15px; font-weight: 600;
  cursor: pointer; transition: all 0.3s;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff; border: none;
  box-shadow: 0 4px 24px rgba(0,102,255,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 32px rgba(0,102,255,0.5);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.05);
  border-color: var(--text-2);
}

.hero-stats {
  display: flex; gap: 48px; justify-content: center;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 36px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 13px; color: var(--text-3);
  margin-top: 4px;
}

.scroll-hint {
  position: absolute; bottom: 32px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-3); font-size: 12px;
}
.scroll-line {
  width: 1px; height: 32px;
  background: linear-gradient(180deg, var(--text-3) 0%, transparent 100%);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0%,100% { opacity:0.3; }
  50% { opacity:1; }
}

/* ===== 通用 Section ===== */
section { padding: 100px 0; }

.section-header {
  text-align: center; max-width: 640px; margin: 0 auto 64px;
  padding: 0 24px;
}
.section-tag {
  display: inline-block;
  font-size: 12px; letter-spacing: 3px; font-weight: 600;
  color: var(--primary);
  margin-bottom: 12px;
}
.section-title {
  font-size: 36px; font-weight: 700;
  margin-bottom: 12px;
}
.section-desc {
  font-size: 15px; color: var(--text-2);
}

/* ===== 业务卡片 ===== */
.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
}

.business-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 28px;
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
  overflow: hidden;
}
.business-card::before {
  content: ''; position: absolute; top:0; left:0; right:0; height: 3px;
  background: var(--card-color);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.4s;
}
.business-card:hover {
  transform: translateY(-8px);
  border-color: var(--card-color);
  box-shadow: 0 20px 48px rgba(0,0,0,0.4);
}
.business-card:hover::before { transform: scaleX(1); }

.business-card.featured {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
}

.card-badge {
  position: absolute; top: 20px; right: 20px;
  padding: 4px 10px; border-radius: 6px;
  font-size: 11px; font-weight: 600;
  background: var(--orange); color: #fff;
}

.card-icon {
  width: 56px; height: 56px;
  color: var(--card-color);
  margin-bottom: 24px;
}
.card-icon svg { width:100%; height:100%; }

.card-num {
  position: absolute; top: 28px; right: 28px;
  font-size: 48px; font-weight: 800;
  color: rgba(255,255,255,0.04);
  line-height: 1;
}
.featured .card-num { right: 60px; }

.card-title {
  font-size: 20px; font-weight: 700;
  margin-bottom: 14px; color: var(--text);
}
.card-desc {
  font-size: 14px; color: var(--text-2); line-height: 1.8;
  margin-bottom: 20px;
}

.card-features { margin-bottom: 24px; }
.card-features li {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-2);
  padding: 4px 0;
}
.dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--card-color); flex-shrink: 0;
}

.card-link {
  font-size: 14px; font-weight: 600;
  color: var(--card-color);
  transition: gap 0.2s;
  display: inline-flex; align-items: center; gap: 4px;
}
.card-link:hover { gap: 8px; }

/* ===== 核心优势 ===== */
.advantage { background: var(--bg-2); }

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
}

.adv-item {
  text-align: center; padding: 32px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s;
}
.adv-item:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}
.adv-icon { font-size: 40px; margin-bottom: 16px; }
.adv-item h3 { font-size: 17px; margin-bottom: 8px; }
.adv-item p { font-size: 13px; color: var(--text-2); line-height: 1.7; }

/* ===== 关于我们 ===== */
.about-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: center;
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
}

.about-text .section-tag,
.about-text .section-title,
.about-text .section-desc { text-align: left; }
.about-text .section-header { margin: 0 0 24px; }

.about-desc {
  font-size: 15px; color: var(--text-2); line-height: 2;
  margin-bottom: 16px;
}

.about-info { margin-top: 32px; }
.info-item {
  display: flex; align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.info-label {
  width: 100px; font-size: 13px; color: var(--text-3);
  flex-shrink: 0;
}
.info-value { font-size: 14px; color: var(--text); }

.about-visual { display:flex; justify-content:center; }
.visual-card {
  position: relative;
  width: 320px; height: 320px;
  display: flex; align-items: center; justify-content: center;
}
.visual-line {
  position: absolute;
  width: 280px; height: 280px;
  border: 1px solid var(--border);
  border-radius: 50%;
}
.visual-line::before {
  content: ''; position: absolute; inset: -1px;
  border: 1px solid var(--primary); border-radius: 50%;
  opacity: 0.15;
  animation: pulse 3s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { transform:scale(1); opacity:0.15; }
  50% { transform:scale(1.05); opacity:0.3; }
}

.visual-text {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; gap: 20px;
}
.vt-item {
  display: flex; align-items: center; gap: 10px;
  font-size: 15px; font-weight: 600;
}
.vt-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 12px var(--c);
}

.visual-ring {
  position: absolute;
  width: 60px; height: 60px;
  border: 2px solid var(--primary);
  border-radius: 50%;
  opacity: 0.3;
}

/* ===== 联系我们 ===== */
.contact { background: var(--bg-2); }

.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px; margin: 0 auto;
  padding: 0 24px;
}

.contact-card {
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 24px;
  transition: all 0.3s;
}
.contact-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}
.contact-icon { font-size: 36px; margin-bottom: 16px; }
.contact-card h3 { font-size: 18px; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--text-2); }

/* ===== 页脚 ===== */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 48px 24px 32px;
  text-align: center;
}

.footer-content {
  max-width: 1200px; margin: 0 auto 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
}
.footer-brand {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 600;
}
.footer-brand .logo-icon { color: var(--primary); }

.footer-links {
  display: flex; gap: 24px;
}
.footer-links a {
  font-size: 14px; color: var(--text-2);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text); }

.footer-icp {
  margin-bottom: 12px;
}
.footer-icp a {
  font-size: 13px; color: var(--primary-light);
  transition: all 0.2s;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}
.footer-icp a:hover {
  color: var(--primary);
  text-decoration: underline;
}
.icp-sep { color: var(--text-3); margin: 0 6px; }

.footer-copyright {
  font-size: 13px; color: var(--text-3);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .nav-menu { display: none; }
  .nav-toggle { display: flex; }

  .hero-title { font-size: 36px; }
  .hero-stats { gap: 24px; }

  .business-grid { grid-template-columns: 1fr; }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .about-container { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .hero-title { font-size: 28px; }
  .hero-subtitle { font-size: 14px; }
  .hero-actions { flex-direction: column; }
  .advantage-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 28px; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}

/* ===== 滚入动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}