/* === Synapse Hi-Fi — design tokens === */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Inter+Tight:wght@400;500;600;700;800&display=swap');

:root {
  /* Accent (driven by Tweaks) */
  --accent-h: 22;
  --accent-c: 0.18;
  --accent-l: 0.65;
  --accent: oklch(var(--accent-l) var(--accent-c) var(--accent-h));
  --accent-bright: oklch(0.72 var(--accent-c) var(--accent-h));
  --accent-soft: oklch(var(--accent-l) var(--accent-c) var(--accent-h) / 0.15);
  --accent-faint: oklch(var(--accent-l) var(--accent-c) var(--accent-h) / 0.06);
  --accent-line: oklch(var(--accent-l) var(--accent-c) var(--accent-h) / 0.3);

  /* Accent secondaire — violet (détails, accent #2) */
  --accent-2: oklch(0.62 0.2 295);
  --accent-2-bright: oklch(0.72 0.2 295);
  --accent-2-soft: oklch(0.62 0.2 295 / 0.15);
  --accent-2-faint: oklch(0.62 0.2 295 / 0.06);
  --accent-2-line: oklch(0.62 0.2 295 / 0.3);

  /* Type */
  --font-display: 'Inter Tight', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'Inter', ui-monospace, monospace;

  /* Animation */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* DARK section tokens */
.theme-dark {
  --bg: #0a0908;
  --bg-elevated: #131110;
  --bg-card: #1a1715;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --ink: #f5f0ea;
  --ink-soft: rgba(245, 240, 234, 0.72);
  --ink-faint: rgba(245, 240, 234, 0.5);
  --ink-mute: rgba(245, 240, 234, 0.32);
  --grid: rgba(255, 255, 255, 0.04);
  color-scheme: dark;
}

/* LIGHT section tokens */
.theme-light {
  --bg: #faf8f5;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --border: rgba(15, 12, 10, 0.1);
  --border-strong: rgba(15, 12, 10, 0.2);
  --ink: #14110e;
  --ink-soft: rgba(20, 17, 14, 0.7);
  --ink-faint: rgba(20, 17, 14, 0.5);
  --ink-mute: rgba(20, 17, 14, 0.28);
  --grid: rgba(15, 12, 10, 0.045);
  color-scheme: light;
}

/* Base */
.synapse-page {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01', 'cv11';
}
.synapse-page * { box-sizing: border-box; }

.sn-section {
  background: var(--bg);
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

/* Container */
.sn-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 48px;
  position: relative;
}
@media (max-width: 768px) {
  .sn-container { padding: 0 24px; }
}

/* Type system */
.sn-display {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 0.95;
}
.sn-display-xl {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(56px, 9vw, 132px);
  letter-spacing: -0.045em;
  line-height: 0.92;
}
.sn-display-lg {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(44px, 6vw, 88px);
  letter-spacing: -0.04em;
  line-height: 0.95;
}
.sn-display-md {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(32px, 4vw, 56px);
  letter-spacing: -0.035em;
  line-height: 1;
}
.sn-h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(28px, 3vw, 40px);
  letter-spacing: -0.025em;
  line-height: 1.05;
}
.sn-h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.015em;
  line-height: 1.2;
}
.sn-body {
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
  letter-spacing: -0.005em;
}
.sn-body-sm {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
}
.sn-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.sn-mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.sn-italic {
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
}

/* Buttons */
.sn-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s var(--ease-out);
  white-space: nowrap;
}
.sn-btn-primary {
  background: var(--accent);
  color: #0a0908;
  border-color: var(--accent);
}
.theme-dark .sn-btn-primary {
  box-shadow: 0 0 0 0 var(--accent-soft), 0 8px 24px -8px var(--accent);
}
.sn-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 4px var(--accent-soft), 0 12px 28px -8px var(--accent);
}
.sn-btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border-strong);
}
.sn-btn-ghost:hover {
  background: var(--bg-elevated);
  border-color: var(--ink-faint);
}
.sn-btn-arrow {
  display: inline-block;
  transition: transform 0.2s var(--ease-out);
}
.sn-btn:hover .sn-btn-arrow {
  transform: translateX(3px);
}

/* Chip */
.sn-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--ink-soft);
}
.sn-chip-accent {
  background: var(--accent-soft);
  border-color: var(--accent-line);
  color: var(--accent);
}
.sn-chip-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* Card */
.sn-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s;
}
.sn-card:hover {
  border-color: var(--border-strong);
}

/* Background grid */
.sn-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
}

/* Section divider */
.sn-divider {
  height: 1px;
  background: var(--border);
  width: 100%;
}

/* Utility */
.sn-stack { display: flex; flex-direction: column; }
.sn-row { display: flex; align-items: center; }
.sn-grow { flex: 1; }

/* Reveal-on-scroll */
.sn-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.sn-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}