/* ===== 高密市利登年网络科技有限公司 - Dark Theme (Indigo/Coral) ===== */
:root {
  --bg-primary: #0e0e1a;
  --bg-secondary: #151528;
  --bg-card: #1e1f38;
  --bg-card-hover: #282a48;
  --coral: #f97316;
  --coral-light: #fb923c;
  --coral-dark: #ea580c;
  --indigo: #6366f1;
  --text-primary: #f1f0f5;
  --text-secondary: #a5a0b8;
  --text-muted: #6b6580;
  --border-color: #2a2245;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --gradient-primary: linear-gradient(135deg, #6366f1, #f97316, #6366f1);
  --gradient-bg: linear-gradient(180deg, #0e0e1a 0%, #151528 100%);
  --font-en: 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-zh: 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-en); background: var(--bg-primary); color: var(--text-primary); line-height: 1.8; overflow-x: hidden; }
a { color: var(--coral); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--coral-light); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.lang-toggle { display: inline-flex; align-items: center; gap: 6px; background: transparent; border: 1px solid var(--coral); color: var(--coral); padding: 6px 16px; border-radius: 20px; cursor: pointer; font-size: 14px; font-weight: 500; transition: all 0.3s; font-family: inherit; }
.lang-toggle:hover { background: var(--coral); color: var(--bg-primary); }
[data-lang="zh"] .lang-en { display: none; }
[data-lang="en"] .lang-zh { display: none; }

header { position: fixed; top: 0; width: 100%; z-index: 1000; background: rgba(14,14,26,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); transition: all 0.3s; }
header.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.5); }
nav { display: flex; justify-content: space-between; align-items: center; padding: 16px 0; }
.logo { font-size: 20px; font-weight: 700; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a { color: var(--text-secondary); font-size: 15px; font-weight: 400; position: relative; padding: 4px 0; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--gradient-primary); transition: width 0.3s; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a:hover, .nav-links a.active { color: var(--coral); }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.mobile-toggle span { width: 26px; height: 2px; background: var(--text-primary); transition: all 0.3s; border-radius: 2px; }

.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; background: var(--gradient-bg); position: relative; overflow: hidden; padding: 120px 20px 80px; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(ellipse at 30% 50%, rgba(249,115,22,0.06) 0%, transparent 50%), radial-gradient(ellipse at 70% 50%, rgba(99,102,241,0.04) 0%, transparent 50%); animation: heroGlow 15s ease-in-out infinite alternate; }
@keyframes heroGlow { 0% { transform: translate(0,0); } 100% { transform: translate(-5%,-5%); } }
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge { display: inline-block; padding: 8px 20px; border: 1px solid var(--coral-dark); border-radius: 30px; font-size: 13px; color: var(--coral); margin-bottom: 24px; letter-spacing: 2px; text-transform: uppercase; }
.hero h1 { font-size: clamp(36px, 6vw, 64px); font-weight: 800; line-height: 1.15; margin-bottom: 24px; }
.hero h1 .highlight { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 18px; color: var(--text-secondary); max-width: 640px; margin: 0 auto 36px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 8px; font-size: 16px; font-weight: 600; transition: all 0.3s; cursor: pointer; border: none; font-family: inherit; }
.btn-primary { background: var(--gradient-primary); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(249,115,22,0.3); }
.btn-outline { background: transparent; border: 2px solid var(--coral); color: var(--coral); }
.btn-outline:hover { background: var(--coral); color: #fff; transform: translateY(-2px); }

.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag { display: inline-block; font-size: 13px; color: var(--coral); letter-spacing: 3px; text-transform: uppercase; margin-bottom: 12px; }
.section-header h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 700; margin-bottom: 16px; }
.section-header p { color: var(--text-secondary); font-size: 16px; max-width: 600px; margin: 0 auto; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.service-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 36px 28px; transition: all 0.4s; position: relative; overflow: hidden; }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: var(--gradient-primary); transform: scaleX(0); transform-origin: left; transition: transform 0.4s; }
.service-card:hover::before { transform: scaleX(1); }
.service-card:hover { background: var(--bg-card-hover); transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--coral-dark); }
.service-icon { width: 56px; height: 56px; border-radius: 14px; background: rgba(249,115,22,0.12); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; font-size: 24px; }
.service-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.service-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.7; }

.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 30px; }
.feature-item { text-align: center; padding: 32px 20px; border-radius: 12px; transition: all 0.3s; }
.feature-item:hover { background: var(--bg-card); }
.feature-num { font-size: 42px; font-weight: 800; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 8px; }
.feature-item h4 { font-size: 18px; margin-bottom: 8px; }
.feature-item p { color: var(--text-secondary); font-size: 14px; }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: clamp(28px, 3vw, 38px); margin-bottom: 20px; }
.about-text p { color: var(--text-secondary); margin-bottom: 16px; }
.about-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 24px; text-align: center; }
.stat-number { font-size: 32px; font-weight: 700; color: var(--coral); }
.stat-label { color: var(--text-secondary); font-size: 14px; margin-top: 4px; }

.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; margin-top: 48px; }
.value-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 28px; text-align: center; transition: all 0.3s; }
.value-card:hover { background: var(--bg-card-hover); border-color: var(--coral-dark); }
.value-card .icon { font-size: 36px; margin-bottom: 16px; }
.value-card h4 { font-size: 18px; margin-bottom: 8px; }
.value-card p { color: var(--text-secondary); font-size: 14px; }

.process-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 30px; }
.process-step { text-align: center; }
.step-number { width: 48px; height: 48px; border-radius: 50%; background: var(--gradient-primary); color: #fff; font-weight: 700; font-size: 18px; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
.process-step h4 { font-size: 18px; margin-bottom: 8px; }
.process-step p { color: var(--text-secondary); font-size: 14px; }

.cta-section { background: var(--bg-card); text-align: center; padding: 80px 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.cta-section h2 { font-size: clamp(28px, 3.5vw, 40px); margin-bottom: 16px; }
.cta-section p { color: var(--text-secondary); max-width: 600px; margin: 0 auto 32px; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 40px; }
.contact-info-card h3 { font-size: 22px; margin-bottom: 24px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-icon { width: 44px; height: 44px; min-width: 44px; border-radius: 10px; background: rgba(249,115,22,0.12); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.contact-item h4 { font-size: 14px; color: var(--text-muted); margin-bottom: 2px; }
.contact-item p { font-size: 15px; }
.contact-form { width: 100%; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; color: var(--text-secondary); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 16px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-primary); font-size: 15px; font-family: inherit; transition: border-color 0.3s; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--coral); }
.form-group textarea { min-height: 140px; resize: vertical; }

.service-detail-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.service-detail-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 32px; transition: all 0.3s; }
.service-detail-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--coral-dark); }
.service-detail-card .icon { font-size: 28px; margin-bottom: 16px; }
.service-detail-card h3 { font-size: 18px; margin-bottom: 12px; }
.service-detail-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.team-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 28px 20px; text-align: center; transition: all 0.3s; }
.team-card:hover { background: var(--bg-card-hover); border-color: var(--coral-dark); }
.team-avatar { width: 64px; height: 64px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; font-size: 24px; color: #fff; font-weight: 700; }
.team-card h4 { font-size: 16px; margin-bottom: 4px; }
.team-card p { color: var(--text-secondary); font-size: 13px; }

.legal-content { max-width: 800px; margin: 0 auto; }
.legal-content h1 { font-size: 32px; margin-bottom: 8px; }
.legal-content .last-updated { color: var(--text-muted); font-size: 14px; margin-bottom: 40px; }
.legal-content h2 { font-size: 22px; margin: 36px 0 16px; color: var(--coral); }
.legal-content h3 { font-size: 18px; margin: 24px 0 12px; }
.legal-content p { color: var(--text-secondary); margin-bottom: 12px; line-height: 1.8; }
.legal-content ul, .legal-content ol { color: var(--text-secondary); margin: 12px 0 20px; padding-left: 24px; line-height: 1.8; }
.legal-content li { margin-bottom: 8px; }

footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { font-size: 16px; margin-bottom: 20px; color: var(--coral); }
.footer-col p, .footer-col a { color: var(--text-secondary); font-size: 14px; line-height: 2; display: block; }
.footer-col a:hover { color: var(--coral); }
.footer-bottom { border-top: 1px solid var(--border-color); padding-top: 24px; text-align: center; color: var(--text-muted); font-size: 13px; }

.page-header { padding: 140px 0 60px; text-align: center; background: var(--gradient-bg); position: relative; }
.page-header h1 { font-size: clamp(30px, 4vw, 44px); font-weight: 700; margin-bottom: 12px; }
.page-header p { color: var(--text-secondary); font-size: 16px; max-width: 600px; margin: 0 auto; }

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

@media (max-width: 968px) { .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; } .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; } .hero h1 { font-size: 36px; } }
@media (max-width: 768px) { .nav-links { display: none; position: absolute; top: 100%; left: 0; width: 100%; background: rgba(14,14,26,0.98); flex-direction: column; padding: 20px; gap: 16px; border-bottom: 1px solid var(--border-color); } .nav-links.open { display: flex; } .mobile-toggle { display: flex; } .section { padding: 60px 0; } .footer-grid { grid-template-columns: 1fr; } .features-grid { grid-template-columns: repeat(2, 1fr); } .about-stats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .features-grid, .about-stats { grid-template-columns: 1fr; } .hero-actions { flex-direction: column; align-items: center; } .btn { width: 100%; justify-content: center; } }