/* ============================================================
   noeud.ai — Technical Document Intelligence
   Design System: Deep-tech enterprise, dark, confident
   Typography: Space Grotesk (display) + DM Sans (body)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #060e1a;
  --bg-soft: #0a1628;
  --bg-card: #0d1a2e;
  --bg-card-hover: #111f38;
  --bg-elevated: #13213d;
  --bg-input: #0f1c33;

  --text: #eaf0ff;
  --text-secondary: #94a8c8;
  --text-muted: #6b82a4;
  --text-dim: #4a6080;

  --accent: #4d94ff;
  --accent-glow: rgba(77, 148, 255, 0.25);
  --accent-hover: #6aabff;
  --accent-2: #5eebc2;
  --accent-2-glow: rgba(94, 235, 194, 0.2);
  --accent-3: #9580ff;
  --accent-warn: #ff8f5a;

  --line: rgba(148, 168, 200, 0.12);
  --line-strong: rgba(148, 168, 200, 0.22);
  --line-hover: rgba(77, 148, 255, 0.35);

  --shadow-sm: 0 4px 12px rgba(0,0,0,0.25);
  --shadow-md: 0 12px 40px rgba(0,0,0,0.35);
  --shadow-lg: 0 24px 64px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 60px rgba(77, 148, 255, 0.12);

  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;

  --maxw: 1200px;
  --maxw-narrow: 820px;

  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --header-h: 72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { display: block; max-width: 100%; }
ul { list-style: none; }

::selection {
  background: rgba(77, 148, 255, 0.3);
  color: #fff;
}

/* === Layout === */
.container {
  width: min(calc(100% - 2.5rem), var(--maxw));
  margin: 0 auto;
}
.container--narrow {
  width: min(calc(100% - 2.5rem), var(--maxw-narrow));
  margin: 0 auto;
}

/* === Background Effects === */
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 600px 400px at 15% 10%, rgba(77,148,255,0.08), transparent),
    radial-gradient(ellipse 500px 350px at 85% 20%, rgba(94,235,194,0.05), transparent),
    radial-gradient(ellipse 800px 600px at 50% 80%, rgba(149,128,255,0.04), transparent);
}

/* === Header === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  background: rgba(6, 14, 26, 0.82);
  border-bottom: 1px solid var(--line);
  transition: transform 0.35s ease, background 0.35s ease;
}
.site-header.header--hidden { transform: translateY(-100%); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 20px var(--accent-glow);
}
.brand em {
  font-style: normal;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 0.2rem;
  align-items: center;
}
.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-xs);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.04); }
.nav-links a.active { color: var(--text); background: rgba(255,255,255,0.06); }

.nav-actions { display: flex; gap: 0.6rem; align-items: center; flex-shrink: 0; }

/* Mobile hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
  background: rgba(255,255,255,0.03);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
}
.btn:hover {
  border-color: var(--line-strong);
  background: rgba(255,255,255,0.06);
  transform: translateY(-1px);
}
.btn--primary {
  background: linear-gradient(135deg, var(--accent), #3d7aff);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 8px 24px rgba(77,148,255,0.3);
}
.btn--primary:hover {
  box-shadow: 0 12px 32px rgba(77,148,255,0.4);
  background: linear-gradient(135deg, var(--accent-hover), #5090ff);
}
.btn--large {
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
}
.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.05);
}
.btn--sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
}
.btn .arrow { transition: transform var(--transition); }
.btn:hover .arrow { transform: translateX(3px); }

/* === Section === */
.section {
  padding: 5rem 0;
  position: relative;
}
.section--hero { padding: 8rem 0 5rem; }
.section--flush { padding: 3rem 0; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 1rem;
}
.section-label::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--accent-2);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}
.section-title em {
  font-style: italic;
  color: var(--accent);
}

.section-desc {
  margin-top: 1rem;
  max-width: 640px;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.section-header {
  margin-bottom: 3rem;
}

/* === Hero === */
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 5.5vw, 5.2rem);
  font-weight: 400;
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-lead {
  color: var(--text-secondary);
  font-size: 1.12rem;
  line-height: 1.7;
  max-width: 540px;
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}
.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
}
.proof-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255,255,255,0.02);
}
.proof-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  flex-shrink: 0;
}

/* Hero pipeline panel */
.hero-panel {
  background: linear-gradient(170deg, var(--bg-elevated) 0%, var(--bg-card) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.hero-panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  gap: 1rem;
}
.panel-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(94,235,194,0.25);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-2);
  background: rgba(94,235,194,0.06);
}
.status-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.pipeline-steps { display: grid; gap: 0.6rem; }
.pipe-step {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
}
.pipe-step-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  margin-bottom: 0.4rem;
}
.pipe-step h3 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.pipe-step p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.5;
}
.pipe-arrow {
  text-align: center;
  color: var(--accent);
  font-size: 0.9rem;
  opacity: 0.6;
}

/* === Stats === */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  transition: border-color var(--transition);
}
.stat-card:hover { border-color: var(--line-strong); }
.stat-value {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 400;
  line-height: 1;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.stat-value em { font-style: italic; color: var(--accent); }
.stat-unit {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}
.stat-label {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

/* === Cards (generic) === */
.card {
  background: linear-gradient(175deg, var(--bg-card) 0%, rgba(10,22,40,0.95) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--line-hover);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}
.card--no-hover:hover {
  transform: none;
  box-shadow: var(--shadow-sm);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  background: linear-gradient(135deg, rgba(77,148,255,0.1), rgba(94,235,194,0.06));
  margin-bottom: 1.25rem;
  flex-shrink: 0;
}

.card h3 {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  line-height: 1.3;
}
.card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* === Domain Cards === */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.domain-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.domain-card .card-top {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
}
.domain-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tag {
  display: inline-block;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255,255,255,0.02);
}
.domain-card .card-footer {
  margin-top: auto;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.domain-link {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.domain-link:hover { color: var(--accent-hover); }

/* === Features Grid === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

/* === Use Cases === */
.use-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.use-card .use-number {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

/* === Domain Detail Page === */
.domain-hero {
  padding: 8rem 0 3rem;
}
.domain-hero-inner {
  max-width: 720px;
}
.domain-hero .domain-icon-lg {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: 1.8rem;
  background: linear-gradient(135deg, rgba(77,148,255,0.1), rgba(94,235,194,0.06));
  margin-bottom: 1.5rem;
}
.domain-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4.5vw, 4rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.domain-hero .domain-lead {
  color: var(--text-secondary);
  font-size: 1.12rem;
  line-height: 1.7;
  max-width: 600px;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.detail-box {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}
.detail-box h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-2);
  margin-bottom: 1rem;
}
.detail-box ul {
  display: grid;
  gap: 0.55rem;
}
.detail-box li {
  color: var(--text-secondary);
  font-size: 0.92rem;
  padding-left: 1rem;
  position: relative;
}
.detail-box li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}

/* === CTA / Contact === */
.cta-section {
  background: linear-gradient(170deg, var(--bg-elevated) 0%, var(--bg-card) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 15%;
  right: 15%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}
.cta-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 400;
  margin-bottom: 0.75rem;
}
.cta-section h2 em { font-style: italic; color: var(--accent); }
.cta-section p {
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 2rem;
  font-size: 1.02rem;
}
.cta-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* === Contact Form === */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2rem;
  align-items: start;
}
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}
.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.92rem;
  transition: border-color var(--transition);
  outline: none;
}
.form-input:focus,
.form-textarea:focus { border-color: var(--accent); }
.form-textarea { min-height: 140px; resize: vertical; }
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%236b82a4' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* === Footer === */
.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-left {
  color: var(--text-muted);
  font-size: 0.88rem;
}
.footer-links {
  display: flex;
  gap: 1.5rem;
}
.footer-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
}
.footer-links a:hover { color: var(--text); }

/* === Breadcrumb === */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.breadcrumb a:hover { color: var(--text); }
.breadcrumb .sep { opacity: 0.4; }

/* === Divider === */
.divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 3rem 0;
}

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

/* === Responsive === */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .domains-grid,
  .features-grid,
  .use-grid,
  .detail-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .section--hero { padding: 7rem 0 3.5rem; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }

  .nav-links, .nav-actions { display: none; }
  .hamburger { display: flex; }

  .nav-links.mobile-open,
  .nav-actions.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(6,14,26,0.96);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    border-bottom: 1px solid var(--line);
    gap: 0.5rem;
    z-index: 999;
  }
  .nav-actions.mobile-open { top: auto; padding-top: 0; }

  .hero-title { font-size: clamp(2.4rem, 8vw, 3.5rem); }
  .section--hero { padding: 6.5rem 0 3rem; }
  .section { padding: 3.5rem 0; }

  .domains-grid,
  .features-grid,
  .use-grid,
  .stats-row,
  .detail-grid { grid-template-columns: 1fr; }

  .cta-section { padding: 2.5rem 1.5rem; }
}