/* ═══════════════════════════════════════════
   玖之力工业技术 — 参照 GEODRIV CI 设计系统
   ═══════════════════════════════════════════ */

:root {
  /* Spacing — 8px grid */
  --ds-0: 0;
  --ds-4: 4px;
  --ds-8: 8px;
  --ds-12: 12px;
  --ds-16: 16px;
  --ds-20: 20px;
  --ds-24: 24px;
  --ds-32: 32px;
  --ds-40: 40px;
  --ds-48: 48px;
  --ds-56: 56px;
  --ds-64: 64px;
  --ds-80: 80px;

  /* Radius */
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;

  /* Brand */
  --brand-blue: #1a6fb5;
  --brand-blue-hover: #2b8fd4;

  /* Backgrounds — dark theme */
  --bg-root: #050b14;
  --bg-card: rgba(255,255,255,0.045);
  --bg-nav: rgba(5,11,20,0.78);
  --bg-nav-scrolled: rgba(2,5,12,0.92);
  --bg-hover: rgba(255,255,255,0.08);
  --bg-badge: rgba(26,111,181,0.18);

  /* Borders — dark theme */
  --border-subtle: rgba(255,255,255,0.08);
  --border-card: rgba(255,255,255,0.12);
  --border-strong: rgba(255,255,255,0.22);
  --border-input: rgba(255,255,255,0.14);

  /* Text — dark theme */
  --text-primary: #f0f7ff;
  --text-secondary: rgba(240,247,255,0.65);
  --text-muted: rgba(240,247,255,0.38);
  --text-accent: #60a5fa;

  /* Button */
  --btn-text: #ffffff;
  --btn-shadow: 0 0 0 1px rgba(26,111,181,0.2), 0 4px 14px rgba(26,111,181,0.12);

  /* Glow */
  --glow-blue: 0 0 20px rgba(26,111,181,0.15);
  --glow-blue-strong: 0 0 30px rgba(26,111,181,0.25);
}

/* Smooth easing preset */
:root {
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Source Sans 3", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-root);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Cosmic depth & floating particles */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: -1;
  background:
    /* Subtle cosmic top-down glow */
    radial-gradient(ellipse at 50% 0%, rgba(26,111,181,0.05) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 80%, rgba(45,160,180,0.03) 0%, transparent 50%),
    /* Floating stardust particles */
    radial-gradient(1.5px 1.5px at 12% 18%, rgba(26,111,181,0.08) 50%, transparent 50%),
    radial-gradient(1px 1px at 35% 32%, rgba(26,111,181,0.05) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 58% 15%, rgba(26,111,181,0.07) 50%, transparent 50%),
    radial-gradient(1px 1px at 72% 42%, rgba(45,160,180,0.04) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 88% 28%, rgba(26,111,181,0.06) 50%, transparent 50%),
    radial-gradient(1px 1px at 22% 55%, rgba(26,111,181,0.05) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 48% 68%, rgba(45,160,180,0.04) 50%, transparent 50%),
    radial-gradient(1px 1px at 65% 75%, rgba(26,111,181,0.05) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 82% 62%, rgba(26,111,181,0.06) 50%, transparent 50%),
    radial-gradient(1px 1px at 5% 82%, rgba(45,160,180,0.03) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 42% 88%, rgba(26,111,181,0.05) 50%, transparent 50%),
    radial-gradient(1px 1px at 92% 52%, rgba(26,111,181,0.04) 50%, transparent 50%);
  pointer-events: none;
}

a {
  color: var(--brand-blue);
  text-decoration: none;
  transition: color 0.2s var(--ease-out-expo);
}

a:hover { color: var(--brand-blue-hover); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--brand-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--ds-16);
  z-index: 2000;
  padding: 8px 16px;
  background: var(--brand-blue);
  color: #fff;
  font-size: 13px;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  transition: top 0.2s var(--ease-out-expo);
}

.skip-link:focus { top: 0; }

/* ═══ Nav ═══ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border-card);
  backdrop-filter: saturate(200%) blur(32px);
  -webkit-backdrop-filter: saturate(200%) blur(32px);
  box-shadow: 0 1px 0 var(--border-subtle);
  transition: background 0.4s var(--ease-out-expo), box-shadow 0.4s var(--ease-out-expo);
}

.nav.scrolled {
  background: var(--bg-nav-scrolled);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06), 0 4px 20px rgba(0,0,0,0.3);
  border-bottom-color: rgba(255,255,255,0.06);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--ds-32);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: var(--ds-10);
}

.nav-logo-text {
  position: relative;
  transition: text-shadow 0.4s var(--ease-out-expo);
  animation: logoGlow 4s ease-in-out infinite;
}

@keyframes logoGlow {
  0%, 100% { text-shadow: 0 0 4px rgba(96,165,250,0); }
  50% { text-shadow: 0 0 12px rgba(96,165,250,0.15); }
}

.nav-logo:hover .nav-logo-text {
  text-shadow: 0 0 20px rgba(96,165,250,0.35);
}

.nav-logo-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #93bbfc;
  background: rgba(26,111,181,0.2);
  border: 0.5px solid rgba(26,111,181,0.3);
  border-radius: 20px;
  text-transform: uppercase;
  transition: background 0.3s var(--ease-out-expo), border-color 0.3s var(--ease-out-expo), box-shadow 0.3s var(--ease-out-expo);
}

.nav-logo:hover .nav-logo-badge {
  background: rgba(26,111,181,0.25);
  border-color: rgba(26,111,181,0.4);
  box-shadow: 0 0 12px rgba(26,111,181,0.15);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--ds-24);
}

.nav-links {
  display: flex;
  gap: var(--ds-32);
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s var(--ease-out-expo);
  letter-spacing: 0.01em;
}

.nav-links a:hover {
  color: var(--text-accent);
}

/* Language switcher */
.lang-switch {
  padding: 6px 12px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.3s var(--ease-out-expo), border-color 0.3s var(--ease-out-expo), color 0.3s var(--ease-out-expo), transform 0.3s var(--ease-out-expo);
}

.lang-switch:hover {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.22);
  color: var(--text-accent);
  transform: scale(1.04);
}

.lang-switch:active {
  transform: scale(0.96);
}

.lang-current {
  display: inline-block;
  transition: transform 0.35s var(--ease-bounce);
}

.lang-switch.switching .lang-current {
  transform: rotateY(360deg);
}

/* ═══════════════════════════════════════════
   星辰大海 · Stars & Sea Design System
   ═══════════════════════════════════════════ */

/* ─── Nebula/Deep Space Glow ─── */
:root {
  --cosmic-deep: #020916;
  --cosmic-mid: #06142a;
  --cosmic-sea: #0a1e3f;
  --cosmic-shore: #0e2a54;
  --star-dim: rgba(255,255,255,0.22);
  --star-mid: rgba(255,255,255,0.38);
  --star-bright: rgba(180,215,255,0.72);
  --nebula-blue: rgba(26,111,181,0.22);
  --nebula-teal: rgba(45,160,180,0.12);
  --constellation: rgba(160,205,245,0.28);
  --meteor: rgba(210,235,255,0.85);
}

/* ═══ Hero ═══ */
.hero {
  background: linear-gradient(
    172deg,
    var(--cosmic-deep) 0%,
    var(--cosmic-mid) 18%,
    var(--cosmic-sea) 40%,
    #0c2040 55%,
    #0d2547 70%,
    var(--cosmic-shore) 85%,
    #154c80 100%
  );
  color: #fff;
  padding: 140px var(--ds-32) 120px;
  position: relative;
  overflow: hidden;
  text-align: left;
}

/* Nebula glow layers — enhanced depth */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    /* Upper atmosphere glow */
    radial-gradient(ellipse 1000px 400px at 20% 15%, rgba(26,111,181,0.13) 0%, transparent 55%),
    /* Deep space nebula */
    radial-gradient(ellipse 700px 500px at 70% 35%, rgba(26,111,181,0.08) 0%, transparent 50%),
    /* Sea floor glow */
    radial-gradient(ellipse 500px 300px at 50% 80%, rgba(26,111,181,0.10) 0%, transparent 50%),
    /* Subtle teal accent */
    radial-gradient(ellipse 400px 250px at 30% 60%, rgba(45,160,180,0.05) 0%, transparent 45%),
    /* Ambient blue wash */
    radial-gradient(ellipse 800px 800px at 50% 50%, rgba(26,111,181,0.04) 0%, transparent 60%);
  pointer-events: none;
}

/* ─── Starfield Layer 1: Deep field (tiny distant stars) ─── */
.starfield-deep {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
}

.starfield-deep::before,
.starfield-deep::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}

.starfield-deep::before {
  background-image:
    radial-gradient(1px 1px at 3% 8%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 11% 22%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 18% 5%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 23% 35%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 31% 12%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 37% 42%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 44% 7%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 52% 28%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 58% 15%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 63% 38%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 71% 9%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 78% 32%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 86% 18%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 93% 41%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 8% 55%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 16% 68%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 27% 52%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 33% 73%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 41% 58%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 49% 77%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 55% 48%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 66% 62%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 73% 71%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 82% 45%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 89% 67%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 95% 54%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 5% 85%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 14% 92%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 22% 78%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 38% 88%, var(--star-dim) 50%, transparent 50%);
  background-size: 100% 100%;
  animation: starTwinkleDeep 8s ease-in-out infinite;
}

.starfield-deep::after {
  background-image:
    radial-gradient(1px 1px at 7% 3%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 19% 17%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 29% 8%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 35% 33%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 46% 19%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 53% 37%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 61% 11%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 69% 25%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 76% 40%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 84% 6%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 91% 21%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 12% 49%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 25% 63%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 39% 51%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 47% 69%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 57% 55%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 64% 76%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 72% 49%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 81% 59%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 88% 73%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 96% 38%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 9% 79%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 17% 86%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 28% 94%, var(--star-dim) 50%, transparent 50%),
    radial-gradient(1px 1px at 43% 81%, var(--star-dim) 50%, transparent 50%);
  background-size: 100% 100%;
  animation: starTwinkleDeep 9.5s ease-in-out 2s infinite;
}

@keyframes starTwinkleDeep {
  0%, 100% { opacity: 0.6; }
  25% { opacity: 0.85; }
  50% { opacity: 0.5; }
  75% { opacity: 0.9; }
}

/* ─── Starfield Layer 2: Mid field (medium stars) ─── */
.starfield-mid {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(2px 2px at 10% 15%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 25% 10%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 38% 28%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 52% 18%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 65% 35%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 80% 12%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 92% 30%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 15% 45%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 34% 55%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 48% 42%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 60% 58%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 74% 43%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 88% 52%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 20% 72%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 42% 68%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 56% 78%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 70% 62%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 84% 74%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 6% 88%, var(--star-mid) 50%, transparent 50%),
    radial-gradient(2px 2px at 30% 83%, var(--star-mid) 50%, transparent 50%);
  background-size: 100% 100%;
  animation: starTwinkleMid 6s ease-in-out infinite;
}

@keyframes starTwinkleMid {
  0%, 100% { opacity: 0.55; }
  20% { opacity: 0.9; }
  40% { opacity: 0.45; }
  65% { opacity: 0.85; }
  85% { opacity: 0.5; }
}

/* ─── Starfield Layer 3: Bright stars (anchor points) ─── */
.starfield-bright {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image:
    /* Major constellation stars */
    radial-gradient(3px 3px at 15% 22%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 35% 18%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 55% 28%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 75% 15%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 88% 25%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 25% 48%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 48% 38%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 68% 42%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 12% 65%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 40% 58%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 62% 55%, var(--star-bright) 30%, transparent 50%),
    radial-gradient(3px 3px at 82% 48%, var(--star-bright) 30%, transparent 50%);
  background-size: 100% 100%;
  animation: starTwinkleBright 5s ease-in-out infinite;
}

@keyframes starTwinkleBright {
  0%, 100% { opacity: 0.6; }
  15% { opacity: 1; }
  35% { opacity: 0.5; }
  55% { opacity: 0.95; }
  70% { opacity: 0.4; }
  85% { opacity: 0.9; }
}

/* ─── Constellation Lines (SVG) ─── */
.constellation-svg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  animation: constellationBreathing 8s ease-in-out infinite;
}

@keyframes constellationBreathing {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.45; }
}

.constellation-svg line {
  stroke: var(--constellation);
  stroke-width: 0.8;
  stroke-dasharray: 3 8;
  animation: constellationDrift 20s linear infinite;
}

@keyframes constellationDrift {
  0% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -22; }
}

/* ─── Shooting Star ─── */
.shooting-star {
  position: absolute;
  top: -10%;
  left: 60%;
  width: 2px;
  height: 80px;
  background: linear-gradient(to bottom, var(--meteor), transparent);
  border-radius: 1px;
  transform: rotate(-35deg);
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  animation: shootingStar 8s ease-in-out 4s infinite;
}

.shooting-star::after {
  content: '';
  position: absolute;
  top: 0; left: -1px;
  width: 4px; height: 4px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 6px 2px rgba(180,210,255,0.6);
}

.shooting-star:nth-child(2) {
  left: 85%;
  top: -5%;
  transform: rotate(-30deg);
  height: 60px;
  animation-delay: 10s;
  animation-duration: 7s;
}

@keyframes shootingStar {
  0% {
    opacity: 0;
    transform: rotate(-35deg) translateY(0) translateX(0);
  }
  2% {
    opacity: 0.9;
  }
  6% {
    opacity: 0;
    transform: rotate(-35deg) translateY(120vh) translateX(120px);
  }
  100% {
    opacity: 0;
    transform: rotate(-35deg) translateY(120vh) translateX(120px);
  }
}

/* ─── Ocean Wave Transition ─── */
.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  pointer-events: none;
  z-index: 2;
  line-height: 0;
}

.hero-wave svg {
  display: block;
  width: 100%;
  height: auto;
}

.hero-wave .wave-fill {
  fill: var(--bg-root);
}

.hero-wave .wave-foam {
  fill: rgba(255,255,255,0.06);
}

/* ─── Hero Dots (replaced by starfield layers) ─── */
.hero-dots {
  display: none;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--ds-64);
  position: relative;
  z-index: 1;
}

/* Hero text (left side) */
.hero-text {
  flex: 1;
  max-width: 520px;
}

.hero-text .hero-badge {
  display: inline-flex; align-items: center; gap: var(--ds-8);
  padding: 6px var(--ds-16);
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.85);
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: var(--ds-24);
  border: 1px solid rgba(255,255,255,0.12);
}

.hero-text .hero-badge .pulse {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(74,222,128,0.4); }
  50% { opacity: 0.5; box-shadow: 0 0 0 4px rgba(74,222,128,0); }
}

.hero-text h1 {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin-bottom: var(--ds-20);
  color: #fff;
}

.hero-text h1 .hl-accent { color: #60a5fa; }

.hero-text p {
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  font-weight: 400;
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 0;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.45);
  font-weight: 300;
  font-style: italic;
  margin-top: 12px;
  margin-bottom: 24px;
  max-width: 440px;
  line-height: 1.5;
  border-left: 2px solid rgba(96,165,250,0.3);
  padding-left: 14px;
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 28px;
  margin-bottom: 32px;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-stat .num {
  font-family: "Source Sans 3", sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: #60a5fa;
  line-height: 1.1;
}

.hero-stat .lbl {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.5);
  font-weight: 400;
  white-space: nowrap;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  background: linear-gradient(135deg, rgba(96,165,250,0.15), rgba(96,165,250,0.05));
  color: #60a5fa;
  border: 1px solid rgba(96,165,250,0.3);
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.25s;
}

.hero-cta:hover {
  background: rgba(96,165,250,0.2);
  border-color: rgba(96,165,250,0.5);
  transform: translateY(-1px);
}

/* Hero visual (right side) */
.hero-visual {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  padding-right: var(--ds-24);
}

.hero-emblem {
  width: 280px;
  height: 280px;
  animation: emblemFloat 6s ease-in-out infinite;
  filter: drop-shadow(0 0 40px rgba(96,165,250,0.3));
}

@keyframes emblemFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* Radar scanning pulse */
.radar-pulse {
  animation: radarSweep 4s ease-in-out infinite;
  transform-origin: 120px 120px;
}

.radar-pulse:last-child {
  animation-delay: 2s;
  animation-duration: 5s;
}

@keyframes radarSweep {
  0% { opacity: 0; transform: rotate(0deg); }
  10% { opacity: 1; }
  40% { opacity: 1; }
  50% { opacity: 0; transform: rotate(360deg); }
  100% { opacity: 0; transform: rotate(360deg); }
}

/* ═══ Sections ═══ */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--ds-80) var(--ds-32);
  text-align: center;
}

.section-alt {
  background: var(--bg-card);
  border-top: 0.5px solid var(--border-subtle);
  border-bottom: 0.5px solid var(--border-subtle);
  max-width: none;
  padding: var(--ds-80) var(--ds-32);
  position: relative;
}

/* ─── Section Wave Dividers ─── */
.section-wave {
  line-height: 0;
  pointer-events: none;
  position: relative;
  z-index: 2;
}

.section-wave svg {
  display: block;
  width: 100%;
  height: auto;
}

.section-wave--top .wave-fill-top {
  fill: var(--bg-card);
}

.section-wave--bottom .wave-fill-bottom {
  fill: var(--bg-root);
}

/* Deep sea wave between capabilities and about */
.section-wave--deep {
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-root) 100%);
}

.section-wave--deep svg .wave-fill-deep {
  fill: var(--bg-root);
}

.section-wave--deep svg .wave-foam-deep {
  fill: rgba(255,255,255,0.04);
}

.section-alt .section-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.section-eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--ds-12);
  text-align: center;
}

.section h2 {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin-bottom: var(--ds-40);
  color: var(--text-primary);
  text-align: center;
}

/* ═══ Card Grid ═══ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--ds-16);
}

.card {
  background: var(--bg-card);
  border-radius: var(--r-lg);
  padding: var(--ds-40) var(--ds-32);
  border: 0.5px solid var(--border-card);
  transition: border-color 0.35s var(--ease-out-expo), transform 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo);
  cursor: default;
  text-align: center;
}

.card:hover {
  border-color: var(--brand-blue);
  transform: translateY(-4px);
  box-shadow:
    var(--glow-blue-strong),
    0 0 0 1px rgba(26,111,181,0.4),
    0 12px 40px rgba(26,111,181,0.15);
}

.card-icon {
  font-size: 1.75rem;
  margin: 0 auto var(--ds-16);
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-md);
  background: var(--bg-hover);
  transition: transform 0.35s var(--ease-out-expo), background 0.35s var(--ease-out-expo);
}

.card:hover .card-icon {
  transform: scale(1.1);
  background: rgba(26,111,181,0.15);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--ds-8);
  transition: color 0.35s var(--ease-out-expo);
}

.card:hover h3 {
  color: var(--text-accent);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ═══ About Section ═══ */
.about-inner {
  max-width: 640px;
  margin: 0 auto;
}

.about-powered {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--brand-blue);
  padding: 6px 16px;
  border: 0.5px solid rgba(26,111,181,0.2);
  border-radius: 20px;
  margin-bottom: var(--ds-24);
  background: var(--bg-badge);
}

.about-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--ds-20);
}

.about-divider {
  width: 32px;
  height: 1px;
  background: var(--border-card);
  margin: var(--ds-20) auto;
}

.about-sub {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ═══ CTA / Contact ═══ */
.cta-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--ds-48) var(--ds-32) var(--ds-80);
  text-align: center;
}

.cta-card {
  background: var(--bg-card);
  border-radius: var(--r-xl);
  padding: var(--ds-48) var(--ds-40);
  border: 0.5px solid var(--border-card);
  text-align: center;
  transition: border-color 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo);
}

.cta-card:hover {
  border-color: rgba(26,111,181,0.3);
  box-shadow: var(--glow-blue);
}

.cta-card h2 {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--ds-8);
  color: var(--text-primary);
}

.cta-card p {
  color: var(--text-secondary);
  margin-bottom: var(--ds-24);
  font-size: 0.9375rem;
  max-width: 440px;
  margin-left: auto; margin-right: auto;
  line-height: 1.65;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-10);
  padding: var(--ds-16) var(--ds-40);
  background: transparent;
  color: var(--text-accent);
  border: 1.5px solid rgba(96,165,250,0.35);
  border-radius: var(--r-lg);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background 0.3s var(--ease-out-expo),
              border-color 0.3s var(--ease-out-expo),
              color 0.3s var(--ease-out-expo),
              transform 0.3s var(--ease-out-expo),
              box-shadow 0.3s var(--ease-out-expo);
  box-shadow: 0 0 0 1px rgba(96,165,250,0.06);
}

.btn-primary:hover {
  background: rgba(96,165,250,0.1);
  border-color: rgba(96,165,250,0.55);
  color: #93bbfc;
  transform: translateY(-2px);
  box-shadow:
    0 8px 32px rgba(96,165,250,0.12),
    0 0 0 1px rgba(96,165,250,0.15);
}

.btn-primary:active {
  transform: translateY(0);
  background: rgba(96,165,250,0.15);
  border-color: rgba(96,165,250,0.6);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--ds-10) var(--ds-24);
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--r-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.25s var(--ease-out-expo), color 0.25s var(--ease-out-expo), border-color 0.25s var(--ease-out-expo);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
}

.contact-items {
  display: flex;
  justify-content: center;
  gap: var(--ds-40);
  flex-wrap: wrap;
  margin-top: var(--ds-24);
}

.contact-item {
  text-align: center;
}

.contact-item .lbl {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--ds-4);
}

.contact-item .val {
  font-size: 0.9375rem;
  color: var(--text-primary);
  font-weight: 400;
}

/* ═══ Footer ═══ */
.footer {
  border-top: 0.5px solid var(--border-subtle);
  padding: var(--ds-32) var(--ds-32);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  background: var(--bg-card);
  transition: border-top-color 0.3s var(--ease-out-expo);
}

.footer p {
  transition: color 0.3s var(--ease-out-expo);
}

.footer:hover {
  border-top-color: rgba(26,111,181,0.2);
}

.footer:hover p {
  color: var(--text-secondary);
}

.footer p + p {
  margin-top: var(--ds-4);
}

/* ═══ Contact Modal ═══ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease-out-expo), visibility 0.3s var(--ease-out-expo);
  padding: var(--ds-24);
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - var(--ds-48));
  overflow-y: auto;
  background: #0c1624;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--r-xl);
  padding: var(--ds-32);
  position: relative;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  transform: translateY(16px) scale(0.98);
  transition: transform 0.3s var(--ease-out-expo), opacity 0.3s var(--ease-out-expo);
  opacity: 0;
}

.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal h2 {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--ds-24);
  text-align: left;
}

.modal-close {
  position: absolute;
  top: var(--ds-16);
  right: var(--ds-16);
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s var(--ease-out-expo), color 0.25s var(--ease-out-expo), transform 0.25s var(--ease-out-expo);
}

.modal-close:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text-primary);
  transform: rotate(90deg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--ds-16);
  margin-bottom: var(--ds-16);
}

.form-field {
  margin-bottom: var(--ds-16);
  text-align: left;
}

.form-field:last-child {
  margin-bottom: 0;
}

.form-field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--ds-8);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: var(--ds-12) var(--ds-16);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-input);
  border-radius: var(--r-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: border-color 0.25s var(--ease-out-expo), box-shadow 0.25s var(--ease-out-expo), background 0.25s var(--ease-out-expo);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--text-muted);
}

.form-field input:hover,
.form-field select:hover,
.form-field textarea:hover {
  background: rgba(255,255,255,0.09);
  border-color: rgba(255,255,255,0.22);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--brand-blue);
  background: rgba(255,255,255,0.08);
  box-shadow:
    0 0 0 3px rgba(26,111,181,0.2),
    0 0 20px rgba(26,111,181,0.08);
}
.form-field input:focus-visible,
.form-field select:focus-visible,
.form-field textarea:focus-visible {
  outline: 2px solid var(--brand-blue);
  outline-offset: 2px;
}

.form-field input:focus::placeholder,
.form-field textarea:focus::placeholder {
  color: rgba(240,247,255,0.2);
}

.form-field textarea {
  resize: vertical;
  min-height: 120px;
}

.form-field select {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='rgba(240,247,255,0.5)' d='M1 1.5l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.form-field select option {
  background: #0c1624;
  color: var(--text-primary);
}

.modal .btn-primary {
  width: 100%;
  margin-top: var(--ds-8);
}

/* ═══ Form States ═══ */
.is-hidden { display: none; }

.form-success,
.form-error {
  text-align: center;
  padding: var(--ds-40) var(--ds-24);
}
.form-success .success-icon,
.form-error .error-icon {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--ds-16);
  font-size: 1.25rem;
  font-weight: 700;
}
.form-success .success-icon {
  background: rgba(74,222,128,0.15);
  color: #4ade80;
  border: 1px solid rgba(74,222,128,0.3);
}
.form-error .error-icon {
  background: rgba(239,68,68,0.15);
  color: #ef4444;
  border: 1px solid rgba(239,68,68,0.3);
}
.form-success h3 { margin-bottom: var(--ds-8); }
.form-success p,
.form-error p { font-size: 0.875rem; color: var(--text-secondary); }

/* ═══ Scroll-triggered animations ═══ */
[data-animate] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.65s var(--ease-out-expo),
              transform 0.65s var(--ease-out-expo);
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

[data-animate] > [data-animate-child] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s var(--ease-out-expo),
              transform 0.55s var(--ease-out-expo);
  transition-delay: calc(var(--i, 0) * 100ms);
}

[data-animate].visible > [data-animate-child] {
  opacity: 1;
  transform: translateY(0);
}

/* ═══ Responsive ═══ */
@media (max-width: 768px) {
  .hero-inner { flex-direction: column; gap: var(--ds-32); text-align: center; }
  .hero-text { max-width: 100%; }
  .hero-text p { margin: 0 auto; }
  .hero-subtitle { margin-left: auto; margin-right: auto; max-width: 380px; }
  .hero-stats { justify-content: center; gap: 20px; flex-wrap: wrap; }
  .hero-cta { margin: 0 auto; }
  .hero-emblem { width: 200px; height: 200px; }
  .hero-visual { margin: 0 auto; }
  .hero { padding: 120px var(--ds-24) 100px; }

  .section { padding: var(--ds-56) var(--ds-24); }
  .section-alt { padding: var(--ds-56) var(--ds-24); }
  .cta-section { padding: var(--ds-40) var(--ds-24) var(--ds-64); }
  .cta-card { padding: var(--ds-32) var(--ds-20); }

  .grid-2 { grid-template-columns: 1fr; }
  .contact-items { gap: var(--ds-24); flex-direction: column; }

  .nav-links { display: none; }
  .nav-logo { margin: 0 auto; }

  .form-row { grid-template-columns: 1fr; gap: 0; }
  .modal { padding: var(--ds-24); }
  .modal h2 { margin-bottom: var(--ds-16); }
}

@media (max-width: 640px) {
  .hero { padding: 100px var(--ds-16) 88px; }
  .section { padding: var(--ds-40) var(--ds-16); }
  .section-alt { padding: var(--ds-40) var(--ds-16); }
}

/* Tablet landscape (768–1100px) gap filling */
@media (min-width: 769px) and (max-width: 1100px) {
  .hero-inner { gap: var(--ds-48); }
  .section { padding: var(--ds-64) var(--ds-24); }
  .section-alt { padding: var(--ds-64) var(--ds-24); }
  .hero-emblem { width: 240px; height: 240px; }
}

/* Wide desktop adjustments */
@media (min-width: 1800px) {
  .hero {
    padding: 160px var(--ds-32) 140px;
  }
  .nav-inner, .section, .cta-section {
    max-width: 1200px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-animate],
  [data-animate] > [data-animate-child] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .starfield-deep::before,
  .starfield-deep::after,
  .starfield-mid,
  .starfield-bright {
    opacity: 0.5;
    animation: none;
  }
  .shooting-star { display: none; }
  .constellation-svg { opacity: 0.12; animation: none; }
  .constellation-svg line { animation: none; }
  .nav-logo-text { animation: none; }
  .hero-text .hero-badge .pulse { animation: none; }
  .hero-emblem { animation: none; }
  .radar-pulse { animation: none; opacity: 0.1; }
}