/* ============================================
   Guangzhou Aiyan Vision Technology Co., Ltd.
   Dark Theme - Professional IT Services
   ============================================ */

:root {
    --bg-primary: #0f0815;
    --bg-secondary: #160c22;
    --bg-card: #1c102c;
    --bg-card-hover: #24183a;
    --accent: #a855f7;
    --accent-dim: #7c22ce;
    --accent-glow: rgba(168, 85, 247, 0.12);
    --text-primary: #eae6f0;
    --text-secondary: #a894b8;
    --text-muted: #786888;
    --border: #2a1e3a;
    --border-light: #382850;
    --gradient-1: linear-gradient(135deg, #a855f7, #ec4899);
    --gradient-2: linear-gradient(135deg, #a855f7 0%, #c084fc 50%, #ec4899 100%);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif; background-color: var(--bg-primary); color: var(--text-primary); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; transition: color 0.3s; }
a:hover { color: #fff; }
img { max-width: 100%; height: auto; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(15, 8, 21, 0.9); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 1.2rem; font-weight: 700; color: var(--text-primary); }
.logo-icon { width: 38px; height: 38px; background: var(--gradient-1); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 1.1rem; color: #fff; }
.logo span { background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; list-style: none; gap: 8px; }
.nav-links a { padding: 8px 16px; border-radius: 8px; color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; transition: all 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-cta { background: var(--gradient-1) !important; color: #fff !important; padding: 8px 20px !important; border-radius: 8px !important; font-weight: 600 !important; }
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }
.mobile-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; padding: 8px; }

.hero { min-height: 100vh; display: flex; align-items: center; position: relative; overflow: hidden; padding-top: 72px; }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(ellipse at 20% 50%, rgba(168,85,247,0.06) 0%, transparent 50%), radial-gradient(ellipse at 80% 50%, rgba(236,72,153,0.06) 0%, transparent 50%); pointer-events: none; }
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px); background-size: 60px 60px; pointer-events: none; }
.hero-content { position: relative; z-index: 2; max-width: 800px; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; background: rgba(168,85,247,0.1); border: 1px solid rgba(168,85,247,0.2); border-radius: 50px; font-size: 0.8rem; color: var(--accent); margin-bottom: 24px; }
.hero h1 { font-size: 3.5rem; font-weight: 800; line-height: 1.15; margin-bottom: 24px; letter-spacing: -0.02em; }
.hero h1 .highlight { background: var(--gradient-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.15rem; color: var(--text-secondary); max-width: 600px; margin-bottom: 36px; line-height: 1.8; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 10px; font-weight: 600; font-size: 0.95rem; border: none; cursor: pointer; transition: all 0.3s; }
.btn-primary { background: var(--gradient-1); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--accent-glow); }
.btn-secondary { background: transparent; color: var(--text-primary); border: 1px solid var(--border-light); }
.btn-secondary:hover { border-color: var(--accent); background: rgba(168,85,247,0.05); transform: translateY(-2px); }

.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag { display: inline-block; padding: 4px 14px; background: rgba(168,85,247,0.08); border: 1px solid rgba(168,85,247,0.15); border-radius: 50px; font-size: 0.8rem; color: var(--accent); margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.section-header h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 16px; }
.section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px,1fr)); gap: 24px; }
.service-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 40px 32px; transition: all 0.4s; position: relative; overflow: hidden; }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-1); opacity: 0; transition: opacity 0.4s; }
.service-card:hover { border-color: var(--border-light); transform: translateY(-4px); background: var(--bg-card-hover); }
.service-card:hover::before { opacity: 1; }
.service-icon { width: 56px; height: 56px; background: rgba(168,85,247,0.1); border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 20px; }
.service-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.service-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 2.5rem; margin-bottom: 24px; }
.about-text p { color: var(--text-secondary); margin-bottom: 20px; }
.stats-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.stat-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 28px; text-align: center; }
.stat-number { font-size: 2rem; font-weight: 800; background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { color: var(--text-secondary); font-size: 0.85rem; margin-top: 4px; }

.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 20px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 28px 24px; transition: all 0.3s; }
.feature-card:hover { border-color: var(--border-light); transform: translateY(-2px); }
.feature-card .icon { font-size: 1.8rem; margin-bottom: 14px; }
.feature-card h4 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 0.88rem; }

.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 24px; }
.team-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 36px 24px; text-align: center; transition: all 0.3s; }
.team-card:hover { border-color: var(--border-light); transform: translateY(-4px); }
.team-avatar { width: 80px; height: 80px; border-radius: 50%; background: var(--gradient-1); margin: 0 auto 16px; display: flex; align-items: center; justify-content: center; font-size: 2rem; color: #fff; font-weight: 700; }
.team-card h4 { font-size: 1rem; margin-bottom: 4px; }
.team-card .role { font-size: 0.85rem; color: var(--accent); margin-bottom: 12px; }
.team-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h3 { font-size: 1.8rem; margin-bottom: 24px; }
.contact-details { list-style: none; }
.contact-details li { display: flex; gap: 16px; margin-bottom: 20px; }
.contact-details .icon { width: 44px; height: 44px; min-width: 44px; background: rgba(168,85,247,0.1); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; }
.contact-details .label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.contact-details .value { color: var(--text-primary); font-weight: 500; }
.contact-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 36px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 6px; font-weight: 500; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 16px; background: var(--bg-primary); border: 1px solid var(--border); border-radius: 10px; color: var(--text-primary); font-size: 0.95rem; 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(--accent); }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.site-footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 12px; max-width: 300px; }
.footer-heading { font-size: 0.9rem; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: var(--text-secondary); font-size: 0.88rem; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-bottom p { color: var(--text-muted); font-size: 0.83rem; }

.page-header { padding-top: 136px; padding-bottom: 48px; background: radial-gradient(ellipse at 50% 0%, rgba(168,85,247,0.05) 0%, transparent 60%); text-align: center; }
.page-header h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 12px; }
.page-header p { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

.content-page { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 16px; padding: 48px; margin-bottom: 60px; }
.content-page h2 { font-size: 1.6rem; margin-top: 40px; margin-bottom: 16px; color: var(--accent); }
.content-page h3 { font-size: 1.2rem; margin-top: 32px; margin-bottom: 12px; }
.content-page p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.8; }
.content-page ul, .content-page ol { color: var(--text-secondary); margin-bottom: 16px; padding-left: 24px; }
.content-page li { margin-bottom: 8px; }
.content-page strong { color: var(--text-primary); }
.last-updated { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 24px; font-style: italic; }

.service-detail { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 40px; margin-bottom: 24px; }
.service-detail h3 { font-size: 1.3rem; margin-bottom: 16px; }
.service-detail p { color: var(--text-secondary); margin-bottom: 12px; }
.service-detail ul { color: var(--text-secondary); padding-left: 20px; margin-bottom: 12px; }
.service-detail li { margin-bottom: 6px; }

@media (max-width: 768px) {
    .mobile-toggle { display: block; }
    .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--bg-primary); border-bottom: 1px solid var(--border); flex-direction: column; padding: 16px 24px; gap: 4px; }
    .nav-links.open { display: flex; }
    .hero h1 { font-size: 2.2rem; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .section { padding: 60px 0; }
    .section-header h2 { font-size: 1.8rem; }
    .content-page { padding: 24px; }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 1.8rem; }
    .footer-grid, .stats-grid, .services-grid { grid-template-columns: 1fr; }
}

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }