:root {
  --bg: #f3f5f8;
  --bg-strong: #e6ebf3;
  --surface: rgba(255, 255, 255, 0.68);
  --surface-strong: rgba(255, 255, 255, 0.88);
  --text-primary: #121722;
  --text-secondary: #4f5a6f;
  --accent: #0e69ff;
  --accent-soft: rgba(14, 105, 255, 0.18);
  --stroke: rgba(18, 23, 34, 0.1);
  --radius-lg: 22px;
  --radius-sm: 12px;
  --shadow-xl: 0 24px 80px rgba(18, 23, 34, 0.12);
  --shadow-glass: 0 36px 120px rgba(18, 23, 34, 0.22);
  --hero-font: "Syne", sans-serif;
  --body-font: "Manrope", sans-serif;
  --button-text: #f8fbff;
  --glass-top: rgba(255, 255, 255, 0.52);
  --glass-bottom: rgba(255, 255, 255, 0.12);
  --glass-edge: rgba(255, 255, 255, 0.58);
  --glass-line: rgba(255, 255, 255, 0.44);
  --glass-glow: rgba(255, 255, 255, 0.3);
  --glass-blur: 18px;
  --glass-sat: 168%;
  --lx: 50%;
  --ly: 50%;
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-snappy: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --time-fast: 180ms;
  --time-base: 350ms;
  --time-slow: 600ms;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  overscroll-behavior-y: none;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  color: var(--text-primary);
  background: radial-gradient(
      circle at 20% -10%,
      color-mix(in srgb, var(--accent) 18%, transparent),
      transparent 45%
    ),
    linear-gradient(180deg, var(--bg), var(--bg-strong));
  line-height: 1.5;
  transition:
    background var(--time-slow) var(--ease-smooth),
    color var(--time-base) var(--ease-snappy);
    /* filter supprimé — recomposite full-page trop coûteux */
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -4;
  background:
    radial-gradient(ellipse 80% 60% at 20% 20%, color-mix(in srgb, var(--accent) 15%, transparent), transparent),
    radial-gradient(ellipse 60% 50% at 80% 70%, color-mix(in srgb, var(--accent) 10%, transparent), transparent);
  opacity: 0.6;
  /* Pas d'animation - statique pour performance */
}

a {
  color: inherit;
  text-decoration: none;
}

p,
h1,
h2,
h3,
ol,
ul {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1160px, calc(100% - 3rem));
  margin-inline: auto;
}

.section {
  padding: 6.5rem 0;
}

.kicker {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 999px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--accent);
  color: var(--button-text);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition:
    transform 200ms var(--ease-smooth),
    box-shadow 200ms var(--ease-smooth),
    background 250ms var(--ease-smooth),
    border-color 250ms var(--ease-smooth),
    color 250ms var(--ease-smooth);
  will-change: transform, box-shadow;
}

.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 38%, transparent);
}

.button:active {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 30%, transparent);
}

.button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 60%, white);
  outline-offset: 3px;
}

.button-small {
  padding: 0.65rem 1rem;
  font-size: 0.88rem;
}

.button-large {
  padding: 1.1rem 2rem;
  font-size: 1rem;
}

.button-ghost {
  background: var(--surface-strong);
  border-color: var(--stroke);
  color: var(--text-primary);
}

.button-ghost:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--stroke));
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 15%, transparent);
}

.scroll-progress {
  position: fixed;
  inset: 0 auto auto 0;
  height: 4px;
  width: var(--progress-width, 0%);
  z-index: 60;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 50%, #ffffff));
  transition: width 120ms linear;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(circle at 10% 10%, rgba(0, 0, 0, 0.03) 1px, transparent 0);
  background-size: 3px 3px;
  mix-blend-mode: multiply;
  opacity: 0.35;
}

.orb {
  position: fixed;
  z-index: -2;
  pointer-events: none;
  border-radius: 999px;
  filter: blur(36px);
  opacity: 0.55;
  transition: background 450ms ease;
}

.orb-one {
  width: 380px;
  height: 380px;
  left: -120px;
  top: 9vh;
  background: color-mix(in srgb, var(--accent) 26%, #ffffff);
}

.orb-two {
  width: 320px;
  height: 320px;
  right: -110px;
  top: 42vh;
  background: color-mix(in srgb, var(--accent) 30%, #ffe5cf);
}

.caustic {
  position: fixed;
  inset: auto;
  z-index: -3;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.3;
  /* Defer animations until first interaction for better initial paint */
  animation-play-state: paused;
}

/* Enable caustic animations only after user has interacted */
body.has-interacted .caustic {
  animation-play-state: running;
}

.caustic-one {
  width: 56vmax;
  height: 56vmax;
  left: -24vmax;
  top: 24vh;
  background:
    repeating-conic-gradient(
      from 0deg,
      color-mix(in srgb, var(--accent) 24%, #ffffff) 0deg 6deg,
      transparent 6deg 15deg
    );
  filter: blur(46px);
  animation: causticDrift 22s linear infinite;
}

.caustic-two {
  width: 44vmax;
  height: 44vmax;
  right: -20vmax;
  top: -8vh;
  background:
    repeating-conic-gradient(
      from 90deg,
      color-mix(in srgb, var(--accent) 22%, #ffffff) 0deg 5deg,
      transparent 5deg 13deg
    );
  filter: blur(38px);
  animation: causticDrift 18s linear infinite reverse;
}

.liquid-glass.liquid-glass {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(160deg, var(--glass-top), var(--glass-bottom)),
    radial-gradient(
      220px 120px at var(--lx) var(--ly),
      var(--glass-glow),
      transparent 68%
    ),
    color-mix(in srgb, var(--surface-strong) 90%, transparent);
  border: 1px solid color-mix(in srgb, var(--glass-edge) 68%, var(--stroke));
  box-shadow:
    var(--shadow-xl),
    inset 0 1px 0 rgba(255, 255, 255, 0.56),
    inset 0 -18px 26px rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  transition:
    border-color var(--time-base) var(--ease-smooth),
    background var(--time-base) var(--ease-smooth),
    box-shadow var(--time-base) var(--ease-smooth),
    transform var(--time-fast) var(--ease-snappy);
}

.liquid-glass.liquid-glass::before,
.liquid-glass.liquid-glass::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.liquid-glass.liquid-glass::before {
  inset: -42% -20%;
  background: linear-gradient(
    112deg,
    transparent 28%,
    color-mix(in srgb, var(--glass-line) 85%, transparent) 42%,
    color-mix(in srgb, var(--glass-line) 35%, transparent) 48%,
    transparent 62%
  );
  transform: translateX(-46%) rotate(7deg);
  opacity: 0.66;
  transition: transform var(--time-slow) var(--ease-smooth);
}

.liquid-glass.liquid-glass:hover::before {
  transform: translateX(36%) rotate(7deg);
}

.liquid-glass.liquid-glass::after {
  inset: 0;
  border-radius: inherit;
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--glass-edge) 74%, transparent),
    inset 0 24px 36px rgba(255, 255, 255, 0.05);
}

.section-head {
  display: grid;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.section-head h2 {
  font-size: clamp(2rem, 3.5vw, 3.2rem);
  font-family: var(--hero-font);
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 780px;
}

@media (max-width: 900px) {
  .section {
    padding: 4.7rem 0;
  }

  .container {
    width: min(1160px, calc(100% - 2rem));
  }

  .liquid-glass {
    --glass-blur: 15px;
  }

  .orb,
  .caustic {
    display: none;
  }

  .grain {
    opacity: 0.18;
  }

  body::before {
    opacity: 0.42;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}