/* =====================================
   He Xiao Xuan - Deep Navy + Teal Theme
   Unique: #14b8a6 teal (vs copper, purple, cyan, emerald,
   gold, fuchsia, orange, blue, amber, rose, lime, sky, indigo)
   ===================================== */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-deep: #060b0a;
  --bg-primary: #090f0e;
  --bg-secondary: #0d1412;
  --bg-card: #111917;
  --bg-card-hover: #182522;
  --text-primary: #e5efed;
  --text-secondary: #94ada8;
  --text-muted: #56706b;
  --accent: #14b8a6;
  --accent-light: #2dd4bf;
  --accent-dark: #0d9488;
  --accent2: #06b6d4;
  --border: #16211e;
  --border-accent: rgba(20, 184, 166, 0.25);
  --gradient-hero: linear-gradient(135deg, #060b0a 0%, #0a1210 50%, #060b0a 100%);
  --gradient-teal: linear-gradient(135deg, #14b8a6 0%, #2dd4bf 50%, #14b8a6 100%);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-accent: 0 4px 20px rgba(20, 184, 166, 0.15);
  --radius: 12px;
  --radius-lg: 16px;
  --nav-height: 72px;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-light); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--accent); }

.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(6, 11, 10, 0.92);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.5px; }
.nav-logo span { color: var(--accent-light); }
.nav-links { display: flex; list-style: none; gap: 8px; }
.nav-links a {
  color: var(--text-muted); padding: 8px 18px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 500; transition: all 0.3s ease; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); background: rgba(20,184,166,0.08); }
.nav-links a.active { color: var(--accent-light); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%;
  transform: translateX(-50%); width: 20px; height: 2px;
  background: var(--accent); border-radius: 2px;
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all 0.3s ease; }

.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  background: var(--gradient-hero); padding: 120px 24px 80px;
  overflow: hidden; position: relative;
}
.hero-glow {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 500px 400px at 25% 20%, rgba(20,184,166,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 400px 400px at 75% 70%, rgba(6,182,212,0.04) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content { max-width: 800px; text-align: center; position: relative; z-index: 1; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.2rem); font-weight: 800; line-height: 1.15; margin-bottom: 24px; letter-spacing: -1px; }
.hero .accent { background: var(--gradient-teal); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--text-secondary); max-width: 650px; margin: 0 auto 36px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn { display: inline-block; padding: 14px 32px; border-radius: 10px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: all 0.3s ease; border: none; text-align: center; }
.btn-primary { background: var(--gradient-teal); color: #060b0a; box-shadow: var(--shadow-accent); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(20,184,166,0.25); color: #060b0a; }
.btn-outline { background: transparent; color: var(--accent-light); border: 2px solid var(--accent); }
.btn-outline:hover { background: rgba(20,184,166,0.1); transform: translateY(-2px); }
.btn-lg { padding: 16px 40px; font-size: 1.1rem; }
.btn-full { width: 100%; }

.hero-stats { display: flex; gap: 48px; margin-top: 60px; position: relative; z-index: 1; }
.stat { text-align: center; }
.stat-num { display: block; font-size: 2.5rem; font-weight: 800; color: var(--accent); line-height: 1; margin-bottom: 6px; }
.stat-label { font-size: 0.9rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; font-weight: 500; }

.section { padding: 100px 24px; position: relative; }
.section-dark { background: var(--bg-primary); }
.container { max-width: 1100px; margin: 0 auto; }
.section-title { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 700; text-align: center; margin-bottom: 16px; }
.section-title .accent { color: var(--accent-light); }
.section-desc { text-align: center; color: var(--text-secondary); max-width: 650px; margin: 0 auto 60px; font-size: 1.05rem; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px 28px; transition: all 0.4s ease; position: relative; overflow: hidden; }
.card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-teal); transform: scaleX(0); transition: transform 0.4s ease; transform-origin: left; }
.card:hover { border-color: var(--border-accent); transform: translateY(-4px); box-shadow: var(--shadow-card); }
.card:hover::before { transform: scaleX(1); }
.card-icon { font-size: 2.5rem; margin-bottom: 16px; display: block; }
.card h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--text-primary); }
.card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 32px; }
.feature { text-align: center; padding: 32px 20px; background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); transition: all 0.3s ease; }
.feature:hover { border-color: var(--border-accent); transform: translateY(-3px); box-shadow: var(--shadow-card); }
.feature-icon { font-size: 2.2rem; margin-bottom: 16px; display: block; }
.feature h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--text-primary); }
.feature p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }

.cta-section { background: var(--bg-secondary); text-align: center; padding: 100px 24px; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 500px 300px at center, rgba(20,184,166,0.06), transparent); pointer-events: none; }
.cta-section h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 20px; position: relative; }
.cta-section p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 36px; max-width: 600px; margin-left: auto; margin-right: auto; position: relative; }

.footer { background: var(--bg-deep); border-top: 1px solid var(--border); padding: 60px 24px 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { font-size: 1.1rem; color: var(--text-primary); margin-bottom: 16px; }
.footer-col p, .footer-col li { color: var(--text-muted); font-size: 0.9rem; line-height: 1.8; }
.footer-col ul { list-style: none; }
.footer-col ul li a { color: var(--text-muted); transition: color 0.3s ease; }
.footer-col ul li a:hover { color: var(--accent-light); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 24px; text-align: center; color: var(--text-muted); font-size: 0.85rem; }

.page-hero { background: var(--gradient-hero); padding: 140px 24px 80px; text-align: center; border-bottom: 1px solid var(--border); }
.page-hero h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; margin-bottom: 16px; }
.page-hero h1 .accent { background: var(--gradient-teal); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.page-hero p { color: var(--text-secondary); font-size: 1.1rem; max-width: 650px; margin: 0 auto; }

.service-block { display: flex; gap: 32px; padding: 40px; background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); margin-bottom: 24px; transition: all 0.4s ease; }
.service-block:hover { border-color: var(--border-accent); transform: translateY(-3px); box-shadow: var(--shadow-card); }
.service-icon { font-size: 3rem; flex-shrink: 0; width: 72px; height: 72px; display: flex; align-items: center; justify-content: center; background: rgba(20,184,166,0.1); border-radius: var(--radius); }
.service-content h2 { font-size: 1.4rem; margin-bottom: 12px; color: var(--accent-light); }
.service-content p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 16px; line-height: 1.7; }
.service-features { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.service-features li { color: var(--text-secondary); font-size: 0.9rem; padding-left: 20px; position: relative; }
.service-features li::before { content: '\2714'; position: absolute; left: 0; color: var(--accent); font-size: 0.8rem; }

.about-intro h2, .about-mission h2, .about-values h2, .about-address h2 { font-size: 1.6rem; margin-bottom: 16px; color: var(--accent-light); }
.about-intro p, .about-mission p { color: var(--text-secondary); font-size: 1rem; line-height: 1.8; margin-bottom: 16px; }
.about-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 48px 0; }
.about-stat { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 16px; text-align: center; color: var(--text-secondary); font-size: 0.9rem; transition: all 0.3s ease; }
.about-stat:hover { border-color: var(--border-accent); transform: translateY(-2px); }
.about-stat strong { display: block; font-size: 1.8rem; color: var(--accent); margin-bottom: 6px; font-weight: 800; }
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin: 32px 0; }
.value-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: all 0.3s ease; }
.value-card:hover { border-color: var(--border-accent); transform: translateY(-2px); }
.value-card h3 { color: var(--accent-light); margin-bottom: 8px; font-size: 1.1rem; }
.value-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }
.about-address { margin-top: 48px; padding: 32px; background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); }

.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.contact-info h2 { font-size: 1.6rem; margin-bottom: 32px; color: var(--accent-light); }
.contact-detail { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-detail-icon { font-size: 1.4rem; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: rgba(20,184,166,0.1); border-radius: var(--radius); flex-shrink: 0; }
.contact-detail h3 { font-size: 1rem; color: var(--text-primary); margin-bottom: 4px; }
.contact-detail p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }
.contact-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px; }
.contact-form h2 { font-size: 1.4rem; margin-bottom: 24px; color: var(--accent); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 6px; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px 16px; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; color: var(--text-primary); font-size: 0.95rem; font-family: inherit; transition: border-color 0.3s ease; outline: none; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(20,184,166,0.1); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select option { background: var(--bg-primary); }

.legal-section { padding: 80px 24px; }
.legal-content h2 { font-size: 1.4rem; color: var(--accent-light); margin: 40px 0 16px; }
.legal-content h2:first-child { margin-top: 0; }
.legal-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.legal-content ul { margin: 0 0 20px 24px; }
.legal-content ul li { color: var(--text-secondary); line-height: 1.8; margin-bottom: 6px; }

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

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links { position: fixed; top: var(--nav-height); left: 0; right: 0; background: rgba(6,11,10,0.98); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border); transform: translateY(-100%); opacity: 0; pointer-events: none; transition: all 0.3s ease; }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav-links a { padding: 12px 16px; font-size: 1.05rem; }
  .hero-stats { flex-direction: column; gap: 24px; }
  .service-block { flex-direction: column; padding: 24px; }
  .service-features { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .contact-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
}