/* ===== 北京朗臣科技 - 主样式表 ===== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Orbitron:wght@400;700;900&display=swap');

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #1f2937;
  --text-primary: #e8eaed;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-dark: #2563eb;
  --accent-glow: rgba(59,130,246,0.25);
  --gradient-1: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-2: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-3: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
  --border: rgba(255,255,255,0.08);
  --border-light: rgba(255,255,255,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.5);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1200px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Noto Sans SC', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== Navigation ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,14,23,0.85); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.nav.scrolled { background: rgba(10,14,23,0.95); box-shadow: var(--shadow); }
.nav-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 68px;
}
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--text-primary); }
.logo-icon { font-size: 1.6rem; color: var(--accent); }
.logo-text { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.05em; }
.nav-links { display: flex; list-style: none; gap: 4px; }
.nav-links > li { position: relative; }
.nav-links a {
  display: block; padding: 8px 14px; text-decoration: none;
  color: var(--text-secondary); font-size: 0.875rem; font-weight: 500;
  border-radius: var(--radius-sm); transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.has-dropdown:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 160px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 8px 0;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: var(--transition); box-shadow: var(--shadow-lg);
}
.dropdown a { padding: 8px 16px; border-radius: 0; font-size: 0.85rem; }
.mobile-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.mobile-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-primary); border-radius: 2px; transition: var(--transition);
}

/* ===== Page Container ===== */
#pageContainer { padding-top: 68px; min-height: calc(100vh - 68px); }

/* ===== Common Section ===== */
.section { padding: 80px 24px; }
.section-inner { max-width: var(--max-width); margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-label {
  display: inline-block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.15em;
  color: var(--accent-light); text-transform: uppercase; margin-bottom: 12px;
  padding: 4px 14px; border: 1px solid rgba(59,130,246,0.3); border-radius: 20px;
}
.section-title {
  font-size: 2.5rem; font-weight: 900; line-height: 1.2; margin-bottom: 16px;
  background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc { font-size: 1.05rem; color: var(--text-secondary); max-width: 700px; margin: 0 auto; }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; text-align: center; overflow: hidden;
  background: radial-gradient(ellipse at 50% 0%, rgba(59,130,246,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 100%, rgba(139,92,246,0.1) 0%, transparent 50%);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='rgba(255,255,255,0.03)' stroke-width='1'/%3E%3C/svg%3E") repeat;
  opacity: 0.5;
}
.hero-content { position: relative; z-index: 1; max-width: 900px; padding: 0 24px; }
.hero-badge {
  display: inline-block; font-size: 0.85rem; padding: 6px 20px;
  border: 1px solid rgba(59,130,246,0.4); border-radius: 30px;
  color: var(--accent-light); margin-bottom: 32px; letter-spacing: 0.05em;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 900; line-height: 1.15;
  margin-bottom: 24px;
}
.hero h1 .gradient { background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p {
  font-size: 1.2rem; color: var(--text-secondary); max-width: 600px;
  margin: 0 auto 40px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 48px; justify-content: center; margin-top: 64px;
  padding-top: 40px; border-top: 1px solid var(--border);
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-family: 'Orbitron', monospace; font-size: 2.2rem; font-weight: 900;
  background: var(--gradient-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-stat .label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: var(--radius); font-size: 0.95rem;
  font-weight: 600; text-decoration: none; cursor: pointer; border: none;
  transition: var(--transition); font-family: inherit;
}
.btn-primary {
  background: var(--gradient-1); color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px var(--accent-glow); }
.btn-outline {
  background: transparent; color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); background: rgba(59,130,246,0.05); }
.btn-sm { padding: 8px 20px; font-size: 0.85rem; }

/* ===== Cards ===== */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; transition: var(--transition);
}
.card:hover { border-color: rgba(59,130,246,0.3); transform: translateY(-4px); box-shadow: var(--shadow); }
.card-icon {
  width: 56px; height: 56px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px;
}
.card-icon.blue { background: rgba(59,130,246,0.1); color: var(--accent-light); }
.card-icon.purple { background: rgba(139,92,246,0.1); color: #a78bfa; }
.card-icon.cyan { background: rgba(6,182,212,0.1); color: #22d3ee; }
.card-icon.pink { background: rgba(236,72,153,0.1); color: #f472b6; }
.card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; }
.card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== Grids ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ===== Service Detail Pages ===== */
.service-hero {
  padding: 100px 24px 60px; text-align: center;
  background: radial-gradient(ellipse at 50% 0%, var(--accent-glow) 0%, transparent 60%);
}
.service-hero h1 { font-size: 2.8rem; font-weight: 900; margin-bottom: 16px; }
.service-hero p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }
.service-features { padding: 60px 24px; }
.service-process { padding: 60px 24px; background: var(--bg-secondary); }
.process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
.process-steps::before {
  content: ''; position: absolute; top: 28px; left: 12.5%; right: 12.5%; height: 2px;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
  opacity: 0.3;
}
.process-step { text-align: center; position: relative; z-index: 1; }
.process-step .step-num {
  width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Orbitron', monospace; font-size: 1.3rem; font-weight: 900;
  background: var(--gradient-1); color: #fff;
}
.process-step h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.process-step p { font-size: 0.85rem; color: var(--text-secondary); }

/* ===== Cases ===== */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; transition: var(--transition);
  cursor: pointer;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(59,130,246,0.3); }
.case-thumb {
  height: 220px; background: var(--bg-secondary); display: flex;
  align-items: center; justify-content: center; font-size: 3rem;
  position: relative; overflow: hidden;
}
.case-thumb::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10,14,23,0.8) 100%);
}
.case-thumb .case-logo { position: relative; z-index: 1; }
.case-info { padding: 20px; }
.case-info h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.case-info p { font-size: 0.85rem; color: var(--text-secondary); }
.case-tags { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.case-tag {
  font-size: 0.75rem; padding: 3px 10px; border-radius: 12px;
  background: rgba(59,130,246,0.1); color: var(--accent-light);
}

/* ===== Tech Stack ===== */
.tech-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.tech-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 16px; text-align: center;
  transition: var(--transition);
}
.tech-item:hover { border-color: rgba(59,130,246,0.3); }
.tech-item .tech-icon { font-size: 2rem; margin-bottom: 12px; }
.tech-item h4 { font-size: 0.85rem; font-weight: 600; }

/* ===== Team ===== */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.team-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 24px; text-align: center;
  transition: var(--transition);
}
.team-card:hover { transform: translateY(-4px); border-color: rgba(59,130,246,0.3); }
.team-avatar {
  width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 20px;
  background: var(--gradient-1); display: flex; align-items: center;
  justify-content: center; font-size: 1.8rem; color: #fff;
}
.team-card h3 { font-size: 1.05rem; font-weight: 700; }
.team-card .role { font-size: 0.85rem; color: var(--accent-light); margin: 4px 0 12px; }
.team-card p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== News ===== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; transition: var(--transition);
  cursor: pointer;
}
.news-card:hover { transform: translateY(-4px); border-color: rgba(59,130,246,0.3); }
.news-card .news-date {
  padding: 16px 20px 0; font-size: 0.8rem; color: var(--text-muted);
}
.news-card .news-info { padding: 12px 20px 20px; }
.news-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.news-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== Partners ===== */
.partners-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.partner-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 16px; text-align: center;
  transition: var(--transition);
}
.partner-item:hover { border-color: rgba(59,130,246,0.3); }
.partner-item .partner-logo { font-size: 2.5rem; margin-bottom: 12px; }
.partner-item h4 { font-size: 0.85rem; font-weight: 600; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-info h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 24px; }
.contact-item {
  display: flex; gap: 16px; margin-bottom: 24px; padding: 20px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
}
.contact-item .ci-icon { font-size: 1.5rem; }
.contact-item h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.contact-item p { font-size: 0.85rem; color: var(--text-secondary); }
.contact-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; }
.contact-form h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 8px; color: var(--text-secondary); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; background: var(--bg-secondary);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text-primary); font-size: 0.9rem; font-family: inherit;
  transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); }
.form-group textarea { min-height: 120px; resize: vertical; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden;
  transition: var(--transition);
}
.faq-q {
  padding: 20px 24px; display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; font-weight: 600; font-size: 0.95rem;
}
.faq-q:hover { color: var(--accent-light); }
.faq-a {
  padding: 0 24px 20px; font-size: 0.9rem; color: var(--text-secondary);
  line-height: 1.8; display: none;
}
.faq-item.open .faq-a { display: block; }
.faq-item.open .faq-q { color: var(--accent-light); }

/* ===== About ===== */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 2rem; font-weight: 900; margin-bottom: 24px; }
.about-text p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.8; font-size: 0.95rem; }
.about-visual {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); height: 400px; display: flex;
  align-items: center; justify-content: center; font-size: 5rem;
  position: relative; overflow: hidden;
}
.about-visual::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(59,130,246,0.15) 0%, transparent 60%);
}

/* ===== Stats Bar ===== */
.stats-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  padding: 48px 0;
}
.stat-item { text-align: center; padding: 32px 16px; }
.stat-item .stat-num { font-family: 'Orbitron', monospace; font-size: 2.5rem; font-weight: 900; color: var(--accent-light); }
.stat-item .stat-label { font-size: 0.9rem; color: var(--text-secondary); margin-top: 8px; }

/* ===== Page Banner ===== */
.page-banner {
  padding: 120px 24px 60px; text-align: center;
  background: radial-gradient(ellipse at 50% 0%, var(--accent-glow) 0%, transparent 60%);
}
.page-banner h1 { font-size: 2.8rem; font-weight: 900; margin-bottom: 16px; }
.page-banner p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

/* ===== Content Block ===== */
.content-block { max-width: 800px; margin: 0 auto; padding: 60px 24px; }
.content-block h2 { font-size: 1.6rem; font-weight: 700; margin: 40px 0 16px; }
.content-block h2:first-child { margin-top: 0; }
.content-block p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.9; font-size: 0.95rem; }
.content-block ul { color: var(--text-secondary); padding-left: 24px; margin-bottom: 16px; }
.content-block li { margin-bottom: 8px; line-height: 1.7; }

/* ===== Footer ===== */
.footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border);
  padding: 60px 24px 30px;
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; }
.footer-col h4 { font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.footer-col p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 0.85rem; color: var(--text-secondary); text-decoration: none; transition: var(--transition); }
.footer-col ul a:hover { color: var(--accent-light); }
.footer-contact li { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 10px; }
.footer-social { display: flex; gap: 12px; margin-top: 16px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center;
  justify-content: center; background: var(--bg-card); color: var(--text-secondary);
  text-decoration: none; transition: var(--transition); font-size: 0.85rem;
}
.footer-social a:hover { background: var(--accent); color: #fff; }
.footer-bottom {
  margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border);
  text-align: center; font-size: 0.8rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); text-decoration: none; }
.footer-bottom a:hover { color: var(--accent-light); }

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}
@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
  50% { box-shadow: 0 0 40px var(--accent-glow); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-4, .process-steps { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .about-intro { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 68px;
    left: 0; right: 0; background: var(--bg-secondary); padding: 16px;
    border-bottom: 1px solid var(--border);
  }
  .mobile-toggle { display: flex; }
  .grid-2, .grid-3, .cases-grid, .news-grid { grid-template-columns: 1fr; }
  .grid-4, .process-steps, .team-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { flex-direction: column; gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.8rem; }
  .process-steps::before { display: none; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}