/* =====================================================
   ChinView Website — styles.css
   Design System: "Precision Dark" — institutional fintech
   ===================================================== */

/* ─── Variables ─────────────────────────────────────── */
:root {
  --bg-deep:        #04091A;
  --bg-primary:     #070D1C;
  --bg-secondary:   #0B1528;
  --bg-card:        rgba(255, 255, 255, 0.04);
  --bg-card-hover:  rgba(255, 255, 255, 0.07);

  --blue:           #1B7FE8;
  --blue-bright:    #2E9BFF;
  --cyan:           #00C8FF;
  --cyan-dim:       rgba(0, 200, 255, 0.12);
  --gold:           #C4A44A;
  --gold-dim:       rgba(196, 164, 74, 0.15);

  --text-bright:    #EEF2FF;
  --text-primary:   #C2CFEA;
  --text-secondary: #7A8BAA;
  --text-muted:     #4A5870;

  --border:         rgba(255, 255, 255, 0.07);
  --border-blue:    rgba(27, 127, 232, 0.25);
  --border-cyan:    rgba(0, 200, 255, 0.2);

  --font-display:   'Playfair Display', 'Noto Serif TC', Georgia, serif;
  --font-body:      'IBM Plex Sans', 'Noto Sans TC', system-ui, sans-serif;
  --font-mono:      'IBM Plex Mono', 'Courier New', monospace;

  --section-pad:    110px;
  --container-max:  1220px;
  --container-x:    clamp(24px, 5vw, 60px);

  --ease-out:       cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:    cubic-bezier(0.4, 0, 0.2, 1);
  --transition:     0.35s var(--ease-out);

  --radius-sm:      6px;
  --radius:         12px;
  --radius-lg:      20px;
}

/* ─── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ─── Language Toggle ────────────────────────────────── */
[data-lang="en"] .lang-zh { display: none !important; }
[data-lang="zh"] .lang-en { display: none !important; }
[data-lang="zh"] h1,
[data-lang="zh"] h2,
[data-lang="zh"] h3,
[data-lang="zh"] h4 {
  font-family: 'Noto Serif TC', serif;
  letter-spacing: 0.04em;
}
[data-lang="zh"] p,
[data-lang="zh"] li,
[data-lang="zh"] .nav-link,
[data-lang="zh"] .btn-primary,
[data-lang="zh"] .section-label {
  font-family: 'Noto Sans TC', sans-serif;
  letter-spacing: 0.02em;
}

/* ─── Layout ─────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-x);
}
.section { padding: var(--section-pad) 0; position: relative; }

/* ─── Scroll Reveal ──────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }

/* ─── Typography Helpers ─────────────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 20px;
}
.section-label::before {
  content: '';
  display: block;
  width: 28px;
  height: 1.5px;
  background: var(--cyan);
  flex-shrink: 0;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.section-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.75;
}

/* ─── Button ─────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  transition: background var(--transition), box-shadow var(--transition), transform 0.2s;
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12), transparent);
  pointer-events: none;
}
.btn-primary:hover {
  background: var(--blue-bright);
  box-shadow: 0 8px 32px rgba(27, 127, 232, 0.4);
  transform: translateY(-1px);
}
.btn-primary svg { flex-shrink: 0; transition: transform 0.25s; }
.btn-primary:hover svg { transform: translateX(3px); }

/* =====================================================
   NAVIGATION
   ===================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(7, 13, 28, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.nav-logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.nav-logo-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.02em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-bright); background: var(--bg-card); }
.nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.lang-toggle {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 100px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.lang-toggle:hover {
  color: var(--cyan);
  border-color: var(--border-cyan);
  background: var(--cyan-dim);
}
.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.nav-mobile-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(4.5px, 4.5px); }
.nav-mobile-toggle.active span:nth-child(2) { opacity: 0; }
.nav-mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(4.5px, -4.5px); }

.nav-mobile {
  display: none;
  background: rgba(7, 13, 28, 0.98);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  padding: 16px var(--container-x) 24px;
}
.nav-mobile ul { display: flex; flex-direction: column; gap: 4px; }
.nav-mobile .nav-link { display: block; padding: 10px 14px; }

/* =====================================================
   HERO
   ===================================================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-deep);
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(4,9,26,0.4) 0%, rgba(4,9,26,0.1) 40%, rgba(4,9,26,0.6) 80%, rgba(4,9,26,0.95) 100%),
    radial-gradient(ellipse at 30% 50%, rgba(27,127,232,0.08) 0%, transparent 60%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 100px;
  max-width: 820px;
}
.hero-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s var(--ease-out) forwards;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 7.5vw, 88px);
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeUp 0.9s 0.35s var(--ease-out) forwards;
}
.hero-title span.lang-zh {
  font-family: 'Noto Serif TC', serif;
  letter-spacing: 0.02em;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary);
  margin-bottom: 48px;
  letter-spacing: 0.02em;
  opacity: 0;
  animation: fadeUp 0.9s 0.5s var(--ease-out) forwards;
}
.hero-pillars {
  display: flex;
  align-items: center;
  gap: 40px;
  margin-bottom: 52px;
  opacity: 0;
  animation: fadeUp 0.9s 0.65s var(--ease-out) forwards;
}
.hero-pillar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.hero-pillar svg { color: var(--cyan); flex-shrink: 0; }
.hero-pillar + .hero-pillar::before {
  content: '';
  display: block;
  width: 1px;
  height: 20px;
  background: var(--border);
  margin-right: 8px;
}
.hero-content .btn-primary {
  opacity: 0;
  animation: fadeUp 0.9s 0.8s var(--ease-out) forwards;
}
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
  animation: pulse 2.5s 1.5s ease-in-out infinite;
}
.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: scrollDrop 2.5s 1.5s ease-in-out infinite;
}

/* =====================================================
   ABOUT
   ===================================================== */
.about { border-top: 1px solid var(--border); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
  margin-top: 20px;
}
.about-desc {
  color: var(--text-secondary);
  font-size: 15.5px;
  line-height: 1.8;
  margin-bottom: 18px;
}
.about-desc:last-child { margin-bottom: 0; }
.about-values {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.value-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition), background var(--transition);
}
.value-card:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-hover);
}
.value-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  margin-bottom: 16px;
}
.value-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 8px;
}
.value-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }

/* =====================================================
   SYSTEM OVERVIEW
   ===================================================== */
.system {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}
.system-header { margin-bottom: 60px; }
.system-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 64px;
  padding: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.system-intro-text h3 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
  margin-top: 28px;
}
.system-intro-text h3:first-child { margin-top: 0; }
.system-intro-text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.system-chart {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(4, 9, 26, 0.8);
  border: 1px solid var(--border-blue);
  padding: 24px;
}
.system-chart svg { width: 100%; height: auto; }
.chart-line { stroke-dasharray: 1200; stroke-dashoffset: 1200; animation: drawLine 3s 0.5s ease-out forwards; }

.dual-core {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  align-items: stretch;
}
.core-card {
  padding: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), background var(--transition);
}
.core-card:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-hover);
}
.core-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  background: var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  margin-bottom: 20px;
}
.core-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 10px;
}
.core-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 16px;
}
.core-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}
.core-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.core-list li {
  font-size: 13.5px;
  color: var(--text-secondary);
  padding-left: 18px;
  position: relative;
}
.core-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.6;
}
.core-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  gap: 12px;
}
.core-divider-line {
  width: 1px;
  flex: 1;
  background: linear-gradient(to bottom, transparent, var(--border-blue), transparent);
}
.core-divider-icon {
  color: var(--blue);
  opacity: 0.6;
  flex-shrink: 0;
}

/* =====================================================
   FEATURES
   ===================================================== */
.features {
  border-top: 1px solid var(--border);
}
.features > .container > .section-title { max-width: 560px; margin-bottom: 56px; }
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.feature-card {
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), background var(--transition), transform 0.25s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.feature-card:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  margin-bottom: 22px;
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 14px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.feature-list li {
  font-size: 13px;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}
.feature-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--blue);
  font-size: 11px;
  top: 1px;
}

/* =====================================================
   PERFORMANCE
   ===================================================== */
.performance {
  background: var(--bg-deep);
  text-align: center;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.perf-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(27,127,232,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(0,200,255,0.04) 0%, transparent 60%);
  pointer-events: none;
}
.performance > .container > .section-label { display: none; }
.performance > .container > .section-title { text-align: center; margin: 0 auto 60px; }
.perf-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  max-width: 900px;
  margin: 0 auto 40px;
}
.perf-item { flex: 1; text-align: center; padding: 20px; }
.perf-number {
  font-family: var(--font-mono);
  font-size: clamp(52px, 8vw, 84px);
  font-weight: 600;
  color: var(--cyan);
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}
.perf-prefix { font-size: 0.5em; opacity: 0.7; }
.perf-suffix { font-size: 0.45em; color: var(--blue); }
.perf-label {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  line-height: 1.5;
}
.perf-divider {
  width: 1px;
  height: 80px;
  background: var(--border);
  flex-shrink: 0;
}
.perf-note {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  margin-top: 12px;
}
/* language label override */
.performance .section-label { display: inline-flex !important; justify-content: center; }

/* =====================================================
   ARCHITECTURE
   ===================================================== */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
  margin-bottom: 56px;
}
.arch-card {
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
  transition: border-color var(--transition), background var(--transition);
}
.arch-card:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-hover);
}
.arch-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 20px;
}
.arch-icon {
  color: var(--cyan);
  margin-bottom: 20px;
}
.arch-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 14px;
}
.arch-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

.tech-table {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.tech-table-header {
  padding: 16px 28px;
  background: rgba(27, 127, 232, 0.1);
  border-bottom: 1px solid var(--border-blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
}
.tech-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.tech-row:last-child { border-bottom: none; }
.tech-row:hover { background: var(--bg-card); }
.tech-key {
  padding: 16px 28px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  border-right: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.tech-val {
  padding: 16px 28px;
  font-size: 13.5px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* =====================================================
   SERVICES
   ===================================================== */
.services { border-top: 1px solid var(--border); }
.services > .container > .section-title { max-width: 540px; margin-bottom: 60px; }
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.service-card {
  padding: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
  transition: border-color var(--transition), background var(--transition), transform 0.25s;
  overflow: hidden;
}
.service-card:hover {
  border-color: var(--border-blue);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}
.service-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 24px;
}
.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  margin-bottom: 22px;
}
.service-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 14px;
}
.service-card p { font-size: 14.5px; color: var(--text-secondary); line-height: 1.75; }

/* =====================================================
   CONTACT
   ===================================================== */
.contact {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-deep) 100%);
}
.contact-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(27,127,232,0.07) 0%, transparent 65%);
  pointer-events: none;
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.contact-text .section-title { margin-bottom: 20px; }
.contact-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 440px;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.contact-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  flex-shrink: 0;
}
.contact-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.contact-value {
  font-size: 14.5px;
  color: var(--text-primary);
  line-height: 1.65;
  transition: color var(--transition);
}
a.contact-value:hover { color: var(--cyan); }
.contact-cta { align-self: flex-start; }

/* =====================================================
   FOOTER
   ===================================================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 40px;
  background: var(--bg-deep);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}
.footer-brand { max-width: 320px; }
.footer-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 16px;
  line-height: 1.6;
}
.footer-links { display: flex; gap: 64px; }
.footer-col h4 {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a {
  font-size: 13.5px;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom { display: flex; flex-direction: column; gap: 8px; }
.footer-copy { font-size: 12px; color: var(--text-muted); }
.footer-disclaimer { font-size: 11.5px; color: var(--text-muted); opacity: 0.6; }

/* =====================================================
   ANIMATIONS
   ===================================================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scrollDrop {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 0; }
  30%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  70%  { transform: scaleY(1); transform-origin: bottom; opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}
@keyframes drawLine {
  to { stroke-dashoffset: 0; }
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 1024px) {
  :root { --section-pad: 80px; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .system-intro { grid-template-columns: 1fr; gap: 40px; }
  .dual-core { grid-template-columns: 1fr; }
  .core-divider { flex-direction: row; padding: 16px 0; }
  .core-divider-line { width: auto; height: 1px; flex: 1; background: linear-gradient(to right, transparent, var(--border-blue), transparent); }
  .arch-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .contact-inner { grid-template-columns: 1fr; gap: 48px; }
}
@media (max-width: 768px) {
  :root { --section-pad: 64px; }
  .nav-links { display: none; }
  .nav-mobile-toggle { display: flex; }
  .nav-mobile.open { display: block; }
  .hero-pillars { gap: 24px; flex-wrap: wrap; }
  .features-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .arch-grid { grid-template-columns: 1fr; }
  .perf-grid { flex-direction: column; }
  .perf-divider { width: 60px; height: 1px; }
  .footer-top { flex-direction: column; gap: 40px; }
  .footer-links { gap: 40px; }
  .tech-row { grid-template-columns: 1fr; }
  .tech-key { border-right: none; border-bottom: 1px solid var(--border); }
  .dual-core { gap: 0; }
  .core-card { border-radius: var(--radius); }
}
@media (max-width: 480px) {
  .hero-title { font-size: clamp(40px, 11vw, 56px); }
  .section-title { font-size: clamp(26px, 7vw, 38px); }
  .core-card { padding: 28px; }
  .feature-card { padding: 28px; }
  .service-card { padding: 28px; }
  .footer-links { flex-direction: column; gap: 28px; }
  .contact-card { padding: 28px; }
}