/* =========================================================
   RayTuring (锐图灵) — Bilingual Static Site
   Design system: dark "cyber" theme
   ========================================================= */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- Design tokens ---------- */
:root {
  --bg: #0a0e17;
  --surface: #0a0e17;
  --surface-raised: #111827;
  --surface-overlay: #1e293b;
  --surface-border: #2d3748;
  --cyber: #00d4ff;
  --cyber-soft: rgba(0, 212, 255, 0.10);
  --ink: #e2e8f0;
  --ink-muted: #94a3b8;
  --ink-dim: #64748b;
  --gradient-btn: linear-gradient(135deg, #00d4ff, #09c);
  --gradient-text: linear-gradient(135deg, #e2e8f0, #00d4ff, #4de8ff);
  --radius: 12px;
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3, h4, h5, h6, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select, textarea { font: inherit; }

/* ---------- Layout ---------- */
.container-wide {
  margin-left: auto; margin-right: auto;
  width: 100%;
  max-width: 80rem;
  padding-left: 1rem; padding-right: 1rem;
}
@media (min-width: 640px) { .container-wide { padding-left: 1.5rem; padding-right: 1.5rem; } }
@media (min-width: 1024px) { .container-wide { padding-left: 2rem; padding-right: 2rem; } }

.section-padding { padding: 5rem 0; }
@media (min-width: 768px) { .section-padding { padding: 7rem 0; } }
@media (min-width: 1024px) { .section-padding { padding: 8rem 0; } }

/* ---------- Typography ---------- */
.font-display { font-family: var(--font-sans); }
.text-hero-md { font-size: 44px; line-height: 1.12; letter-spacing: -0.01em; }
@media (min-width: 768px) { .text-hero-md { font-size: 56px; } }
@media (min-width: 1024px) { .text-hero-md { font-size: 64px; } }
.text-display-lg { font-size: 32px; line-height: 1.15; letter-spacing: -0.01em; }
@media (min-width: 768px) { .text-display-lg { font-size: 40px; } }
.text-display-md { font-size: 26px; line-height: 1.2; letter-spacing: -0.01em; }
@media (min-width: 768px) { .text-display-md { font-size: 32px; } }
.text-display-sm { font-size: 22px; line-height: 1.3; }
@media (min-width: 768px) { .text-display-sm { font-size: 24px; } }
.text-body-lg { font-size: 18px; line-height: 1.7; }
.text-body-md { font-size: 16px; line-height: 1.65; }
.text-body-sm { font-size: 14px; line-height: 1.5; }

.text-ink { color: var(--ink); }
.text-ink-muted { color: var(--ink-muted); }
.text-ink-dim { color: var(--ink-dim); }
.text-cyber { color: var(--cyber); }

.gradient-text-hero {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.glass-card {
  background: rgba(17, 24, 39, 0.6);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(45, 55, 72, 0.5);
  border-radius: var(--radius);
}
.rounded-card { border-radius: 12px; }

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius);
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem; line-height: 1.25rem; font-weight: 600;
  background: var(--gradient-btn);
  color: #0a0e17;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 212, 255, 0.25); }

.btn-outline {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 212, 255, 0.5);
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem; line-height: 1.25rem; font-weight: 600;
  color: var(--cyber);
  background: transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-outline:hover { background: rgba(0, 212, 255, 0.1); }

/* ---------- Background effects ---------- */
.bg-grid-pattern {
  background-image: linear-gradient(rgba(45, 55, 72, 0.3) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(45, 55, 72, 0.3) 1px, transparent 1px);
  background-size: 40px 40px;
}
.bg-radial-glow {
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 212, 255, 0.18), transparent 70%);
}
.bg-radial-glow-bottom {
  background: radial-gradient(ellipse 80% 50% at 50% 120%, rgba(0, 212, 255, 0.12), transparent 70%);
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  transition: all 0.3s ease;
  background: rgba(10, 14, 23, 0.75);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 14, 23, 0.92);
  border-bottom: 1px solid rgba(45, 55, 72, 0.5);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: 0.02em; }
.brand .logo-mark {
  font-family: var(--font-mono); font-weight: 600; color: var(--cyber);
  font-size: 1.15rem; line-height: 1; padding: 6px 8px;
  border: 1px solid rgba(0, 212, 255, 0.4); border-radius: 6px;
}
.brand .brand-name { font-size: 1.15rem; color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-links a {
  padding: 0.5rem 0.8rem; font-size: 0.875rem; font-weight: 500;
  color: var(--ink-muted); border-radius: 8px; transition: color 0.2s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--cyber); background: var(--cyber-soft); }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
.lang-toggle {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px; border-radius: 8px;
  border: 1px solid rgba(45, 55, 72, 0.6);
  color: var(--ink-muted); font-size: 0.8rem; font-weight: 600;
  transition: all 0.2s;
}
.lang-toggle:hover { color: var(--cyber); border-color: rgba(0, 212, 255, 0.5); }
.lang-toggle[data-lang="en"] .zh, .lang-toggle[data-lang="zh"] .en { display: none; }

.menu-toggle {
  display: none; color: var(--ink-muted); padding: 8px; border-radius: 8px;
}
.menu-toggle:hover { color: var(--ink); }

/* Mobile menu */
.mobile-menu {
  display: none;
  background: var(--surface-raised);
  border-top: 1px solid var(--surface-border);
}
.mobile-menu.open { display: block; }
.mobile-menu nav { display: flex; flex-direction: column; gap: 2px; padding: 1rem 0; }
.mobile-menu nav a {
  padding: 0.75rem 1rem; font-size: 0.9rem; font-weight: 500;
  color: var(--ink-muted); border-radius: 8px; transition: color 0.2s;
}
.mobile-menu nav a:hover { color: var(--ink); background: var(--surface-overlay); }
.mobile-menu nav a.active { color: var(--cyber); background: var(--cyber-soft); }
.mobile-menu .mobile-cta { margin-top: 0.5rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 88vh;
  display: flex; align-items: center; overflow: hidden;
  padding-top: 7rem; padding-bottom: 4rem;
}
.hero .hero-bg-overlay { position: absolute; inset: 0; pointer-events: none; }
.hero .hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; margin-bottom: 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.25); background: var(--cyber-soft);
  border-radius: 999px; color: var(--cyber);
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.03em;
}
.hero .hero-eyebrow .pulse-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--cyber);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2);
  animation: pulse 2s infinite;
}
@keyframes pulse { 0% { transform: scale(1); } 50% { transform: scale(1.4); } 100% { transform: scale(1); } }
.hero h1 { max-width: 16ch; margin-bottom: 1.5rem; }
.hero p.lead { max-width: 52ch; color: var(--ink-muted); font-size: 1.125rem; line-height: 1.7; margin-bottom: 2rem; }
.hero .hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ---------- Stats ---------- */
.stats-band { border-top: 1px solid var(--surface-border); border-bottom: 1px solid var(--surface-border); }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; padding: 2.5rem 0; }
@media (min-width: 768px) { .stats-grid { grid-template-columns: repeat(4, 1fr); } }
.stat .stat-number {
  font-family: var(--font-mono); font-size: 2.2rem; font-weight: 600;
  color: var(--cyber); line-height: 1.1;
}
.stat .stat-label { color: var(--ink-muted); font-size: 0.9rem; margin-top: 0.35rem; }

/* ---------- Cards ---------- */
.card {
  background: rgba(17, 24, 39, 0.4);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.3s ease;
}
.card:hover { border-color: rgba(0, 212, 255, 0.4); transform: translateY(-3px); }
.card .card-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--cyber); background: var(--cyber-soft);
  border: 1px solid rgba(0, 212, 255, 0.2);
  font-size: 1.3rem; margin-bottom: 1rem;
}
.card .card-title { font-family: var(--font-sans); font-size: 1.1rem; font-weight: 700; color: var(--ink); margin-bottom: 0.4rem; }
.card .card-desc { color: var(--ink-muted); font-size: 0.9rem; line-height: 1.6; }
.card .card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 0.75rem; }
.chip {
  padding: 3px 10px; border-radius: 6px;
  font-size: 0.72rem; font-weight: 500; color: var(--cyber);
  background: var(--cyber-soft); border: 1px solid rgba(0, 212, 255, 0.2);
  font-family: var(--font-mono);
}

/* Inline stat: number sits at the start of its sentence */
.stat-line { font-size: 1.06rem; line-height: 1.7; }
.stat-inline {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--cyber);
  line-height: 1.15;
  margin-right: 6px;
}

.card-link { display: block; }
.card-link .card-more { margin-top: 1rem; color: var(--cyber); font-size: 0.875rem; font-weight: 600; display: inline-flex; gap: 6px; align-items: center; }
.card-link:hover .card-more { text-decoration: underline; }

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
@media (min-width: 640px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } .grid-4 { grid-template-columns: repeat(4, 1fr); } }

/* ---------- Section headers ---------- */
.section-head { max-width: 48rem; margin-bottom: 2.5rem; }
.section-head .eyebrow {
  display: inline-block; color: var(--cyber); font-size: 0.8rem;
  font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.section-head h2 { margin-bottom: 0.75rem; }
.section-head p { color: var(--ink-muted); }

/* ---------- Feature/step rows ---------- */
.step { display: flex; gap: 1.25rem; align-items: flex-start; }
.step .step-num {
  font-family: var(--font-mono); font-size: 1rem; font-weight: 600;
  color: var(--cyber); width: 40px; height: 40px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(0, 212, 255, 0.3); border-radius: 10px; background: var(--cyber-soft);
}
.step h4 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 0.3rem; }
.step p { color: var(--ink-muted); font-size: 0.9rem; }

/* ---------- Big number stat row ---------- */
.big-number-stat {
  text-align: center; border: 1px solid var(--surface-border);
  border-radius: var(--radius); padding: 1.75rem 1rem;
}
.big-number-stat .num {
  font-family: var(--font-mono); font-size: 2rem; font-weight: 700; color: var(--cyber);
}
.big-number-stat .lbl { color: var(--ink-muted); font-size: 0.85rem; margin-top: 0.4rem; }

/* ---------- News cards ---------- */
.news-card {
  background: rgba(17, 24, 39, 0.4); border: 1px solid var(--surface-border);
  border-radius: var(--radius); overflow: hidden; transition: all 0.3s ease;
  display: flex; flex-direction: column;
}
.news-card:hover { border-color: rgba(0, 212, 255, 0.4); transform: translateY(-3px); }
.news-card .news-img { height: 170px; overflow: hidden; background: var(--surface-overlay); }
.news-card .news-img img { width: 100%; height: 100%; object-fit: cover; }
.news-card .news-body { padding: 1.25rem; display: flex; flex-direction: column; flex: 1; }
.news-card .news-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem; }
.news-card .news-date { color: var(--ink-dim); font-size: 0.8rem; font-family: var(--font-mono); }
.news-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--ink); margin-bottom: 0.6rem; line-height: 1.35; }
.news-card p { color: var(--ink-muted); font-size: 0.9rem; line-height: 1.6; flex: 1; }
.news-card .news-more { margin-top: 1rem; color: var(--cyber); font-size: 0.875rem; font-weight: 600; }

.news-cat { display: inline-flex; padding: 3px 10px; border-radius: 6px; font-size: 0.7rem; font-weight: 600; color: var(--cyber); background: var(--cyber-soft); border: 1px solid rgba(0,212,255,0.2); }

.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 2rem; }
.filter-btn {
  padding: 7px 16px; border-radius: 999px; border: 1px solid var(--surface-border);
  color: var(--ink-muted); font-size: 0.85rem; font-weight: 500; transition: all 0.2s;
}
.filter-btn:hover { color: var(--ink); border-color: rgba(0, 212, 255, 0.4); }
.filter-btn.active { color: var(--cyber); border-color: rgba(0, 212, 255, 0.5); background: var(--cyber-soft); }

/* ---------- Contact form ---------- */
.contact-form { display: flex; flex-direction: column; gap: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 640px) { .form-row.two { grid-template-columns: repeat(2, 1fr); } }
.field label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--ink); margin-bottom: 0.4rem; }
.field label .req { color: var(--cyber); }
.field input, .field select, .field textarea {
  width: 100%; padding: 0.75rem 0.9rem; border-radius: 8px;
  background: rgba(17, 24, 39, 0.5); border: 1px solid var(--surface-border);
  color: var(--ink); transition: border-color 0.2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: rgba(0, 212, 255, 0.6); }
.field textarea { min-height: 120px; resize: vertical; }
.field input::placeholder, .field textarea::placeholder { color: var(--ink-dim); }

.form-success { display: none; padding: 1rem; border-radius: 8px; background: rgba(0, 212, 255, 0.1); border: 1px solid rgba(0, 212, 255, 0.3); color: var(--cyber); }

.form-error { display: none; padding: 1rem; border-radius: 8px; background: rgba(255, 80, 80, 0.1); border: 1px solid rgba(255, 80, 80, 0.4); color: #ff9a9a; font-size: 0.9rem; line-height: 1.5; }
.field-input.invalid, .field input.invalid, .field select.invalid, .field textarea.invalid { border-color: rgba(255, 80, 80, 0.8); }

/* ---------- Contact info ---------- */
.contact-info-item { display: flex; gap: 1rem; align-items: flex-start; padding: 1rem 0; border-bottom: 1px solid var(--surface-border); }
.contact-info-item:last-child { border-bottom: none; }
.contact-info-item .ic {
  width: 42px; height: 42px; flex-shrink: 0; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--cyber); background: var(--cyber-soft); border: 1px solid rgba(0, 212, 255, 0.2);
  font-size: 1.1rem;
}
.contact-info-item .lbl { color: var(--ink-dim); font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.contact-info-item .val { color: var(--ink); font-size: 0.95rem; margin-top: 2px; line-height: 1.5; }

/* ---------- Timeline (milestones) ---------- */
.timeline { position: relative; padding-left: 1.75rem; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--surface-border); }
.tl-item { position: relative; padding-bottom: 2rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item .tl-dot { position: absolute; left: -1.75rem; top: 4px; width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--cyber); background: var(--bg); }
.tl-item .tl-year { font-family: var(--font-mono); font-size: 0.8rem; color: var(--cyber); font-weight: 600; margin-bottom: 0.25rem; }
.tl-item h4 { font-size: 1.05rem; font-weight: 700; color: var(--ink); margin-bottom: 0.3rem; }
.tl-item p { color: var(--ink-muted); font-size: 0.9rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg); border-top: 1px solid var(--surface-border); padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 2.5rem; margin-bottom: 2.5rem; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1.2fr; } }
.footer-brand .brand-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 1.25rem; font-weight: 800; }
.footer-brand .foot-title { font-family: var(--font-mono); color: var(--cyber); font-size: 0.8rem; letter-spacing: 0.08em; margin-bottom: 0.5rem; }
.footer-brand .foot-desc { color: var(--ink-muted); font-size: 0.9rem; line-height: 1.6; }
.footer-col h4 { color: var(--ink); font-size: 0.9rem; font-weight: 700; margin-bottom: 1rem; }
.footer-col ul li { margin-bottom: 0.6rem; }
.footer-col ul a { color: var(--ink-muted); font-size: 0.875rem; transition: color 0.2s; }
.footer-col ul a:hover { color: var(--cyber); }
.footer-contact div { color: var(--ink-muted); font-size: 0.85rem; margin-bottom: 0.6rem; line-height: 1.5; }
.footer-bottom { border-top: 1px solid var(--surface-border); padding-top: 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; align-items: flex-start; justify-content: space-between; }
@media (min-width: 640px) { .footer-bottom { flex-direction: row; align-items: center; } }
.footer-bottom .copyright { color: var(--ink-dim); font-size: 0.8rem; }
.footer-bottom .cn-link { color: var(--ink-muted); font-size: 0.8rem; font-weight: 600; }
.footer-bottom .cn-link:hover { color: var(--cyber); }
.footer-bottom .icp-link { color: var(--ink-dim); font-size: 0.8rem; }
.footer-bottom .icp-link:hover { color: var(--cyber); }

/* ICP + police (公安) filing links, grouped */
.footer-bottom .footer-beian { display: flex; flex-wrap: wrap; gap: 0 1.25rem; align-items: center; row-gap: 0.4rem; }
.footer-bottom .police-link { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-dim); font-size: 0.8rem; white-space: nowrap; }
.footer-bottom .police-link img { height: 18px; width: auto; display: inline-block; }
.footer-bottom .police-link:hover { color: var(--cyber); }

/* Anti-scrape contact info rendered as images (explicit width/height attributes control size) */
.contact-img { max-width: 100%; display: inline-block; vertical-align: middle; }

/* ---------- Page hero (subpages) ---------- */
.page-hero { position: relative; padding: 9rem 0 3rem; overflow: hidden; }
.page-hero .eyebrow { display: inline-block; color: var(--cyber); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 0.75rem; }
.page-hero h1 { font-size: 42px; line-height: 1.12; margin-bottom: 1rem; }
@media (min-width: 768px) { .page-hero h1 { font-size: 56px; } }
.page-hero p { max-width: 52ch; color: var(--ink-muted); font-size: 1.125rem; }

/* ---------- Utilities ---------- */
.mt-20 { margin-top: 1.25rem; }
.mt-40 { margin-top: 2.5rem; }
.mb-40 { margin-bottom: 2.5rem; }
.text-center { text-align: center; }
.code-pill { font-family: var(--font-mono); font-size: 0.9rem; color: var(--cyber); }
.mono { font-family: var(--font-mono); }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal.delay-1 { transition-delay: 0.1s; }
.reveal.delay-2 { transition-delay: 0.2s; }
.reveal.delay-3 { transition-delay: 0.3s; }

@media (max-width: 1023px) {
  .nav-links { display: none; }
  .menu-toggle { display: inline-flex; }
}