/* =========================================================================
   BASE — reset, typographie, layout, fond, utilitaires
   ========================================================================= */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

body {
  min-height: 100svh;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text-mid);
  background: var(--canvas);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-synthesis-weight: none;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
}

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

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

::selection {
  background: rgba(34, 211, 238, 0.28);
  color: var(--text-hi);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* Scrollbar discrète, cohérente avec la palette */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--surface-2) transparent;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.25);
  border-radius: var(--r-full);
  border: 3px solid transparent;
  background-clip: content-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.45);
  background-clip: content-box;
}

/* ---------------------------- Typographie ---------------------------- */

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  color: var(--text-hi);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-tight);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

strong,
b {
  color: var(--text-hi);
  font-weight: 600;
}

code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
  font-size: var(--fs-code);
  font-variant-ligatures: none;
}

kbd {
  display: inline-flex;
  align-items: center;
  padding: 0.1em 0.4em;
  border: 1px solid var(--hairline-strong);
  border-bottom-width: 2px;
  border-radius: var(--r-xs);
  background: var(--surface-inset);
  font-size: 0.78em;
  color: var(--text-hi);
}

.display {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-hero);
  color: var(--text-hi);
}

.h2 {
  font-size: var(--fs-h2);
  font-weight: 650;
  letter-spacing: -0.028em;
}

.h3 {
  font-size: var(--fs-h3);
  font-weight: 620;
}

.h4 {
  font-size: var(--fs-h4);
  font-weight: 600;
}

.lead {
  font-size: var(--fs-lead);
  line-height: 1.6;
  color: var(--text-mid);
}

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--text-low);
}

.mono {
  font-family: var(--font-mono);
}

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

.text-accent-2 {
  color: var(--accent-2);
}

.text-accent-3 {
  color: var(--accent-3);
}

.gradient-text {
  background: linear-gradient(120deg, var(--accent-soft) 0%, var(--accent) 35%, var(--accent-3) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  /* fallback si background-clip:text non supporté */
  -webkit-text-fill-color: transparent;
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .gradient-text {
    color: var(--accent);
    -webkit-text-fill-color: currentColor;
  }
}

/* ---------------------------- Layout ---------------------------- */

.shell {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (max-width: 559px) {
  .shell {
    padding-inline: 1rem;
  }

  .section {
    padding-block: 3.75rem;
  }

  .section-head {
    margin-bottom: var(--sp-6);
  }
}

.section {
  position: relative;
  z-index: var(--z-content);
  padding-block: var(--section-gap);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  margin-bottom: var(--sp-8);
}

@media (min-width: 900px) {
  .section-head--split {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--sp-7);
  }

  .section-head--split > .section-head__aside {
    max-width: 42ch;
  }
}

.section-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--sp-3);
}

.section-head__eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, transparent, currentColor);
}

.section-head__title {
  font-size: var(--fs-h2);
  font-weight: 650;
  letter-spacing: -0.028em;
  color: var(--text-hi);
  max-width: 20ch;
}

.section-head__lead {
  margin-top: var(--sp-3);
  color: var(--text-mid);
  max-width: 62ch;
}

.section-head__aside {
  color: var(--text-low);
  font-size: var(--fs-sm);
}

/* ---------------------------- Fond ---------------------------- */

.bg-layer {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  pointer-events: none;
  overflow: hidden;
}

.bg-layer__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.85;
}

.bg-layer__grid {
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(to right, var(--hairline-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline-soft) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 20%, transparent 78%);
  opacity: 0.75;
}

.bg-layer__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  will-change: transform;
}

.bg-layer__glow--1 {
  width: 46vw;
  height: 46vw;
  top: -14vw;
  left: -10vw;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.42), transparent 68%);
}

.bg-layer__glow--2 {
  width: 40vw;
  height: 40vw;
  top: 24vh;
  right: -12vw;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.32), transparent 68%);
}

.bg-layer__glow--3 {
  width: 34vw;
  height: 34vw;
  bottom: -12vw;
  left: 26vw;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.26), transparent 70%);
}

[data-theme="light"] .bg-layer__glow {
  opacity: 0.35;
}

.bg-layer__noise {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

.bg-layer__scan {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.022) 0px,
    rgba(255, 255, 255, 0.022) 1px,
    transparent 1px,
    transparent 3px
  );
  opacity: 0.55;
}

[data-theme="light"] .bg-layer__scan {
  opacity: 0;
}

/* Voile qui garantit le contraste du texte sur le fond animé */
.bg-layer__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, transparent 0%, rgba(4, 6, 12, 0.55) 100%),
    linear-gradient(to bottom, rgba(4, 6, 12, 0.25) 0%, rgba(4, 6, 12, 0.7) 70%, var(--canvas) 100%);
}

[data-theme="light"] .bg-layer__veil {
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, transparent 0%, rgba(238, 242, 248, 0.6) 100%),
    linear-gradient(to bottom, rgba(238, 242, 248, 0.35) 0%, rgba(238, 242, 248, 0.72) 70%, var(--canvas) 100%);
}

/* ---------------------------- Icônes ---------------------------- */

.icon {
  width: 1em;
  height: 1em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  overflow: visible;
}

/* ---------------------------- Utilitaires ---------------------------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%, -120%);
  z-index: var(--z-toast);
  padding: 0.7rem 1.2rem;
  background: var(--accent);
  color: var(--accent-contrast);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  border-radius: 0 0 var(--r-md) var(--r-md);
  transition: transform var(--t-base) var(--ease-out);
}

.skip-link:focus-visible {
  transform: translate(-50%, 0);
}

.stack {
  display: flex;
  flex-direction: column;
}

.row {
  display: flex;
  align-items: center;
}

.gap-1 { gap: var(--sp-1); }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.gap-5 { gap: var(--sp-5); }
.gap-6 { gap: var(--sp-6); }

.wrap { flex-wrap: wrap; }
.grow { flex: 1 1 auto; }
.center { justify-content: center; }
.between { justify-content: space-between; }
.baseline { align-items: baseline; }
.start { align-items: flex-start; }
.end { align-items: flex-end; }

.mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); }
.mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); }
.mt-6 { margin-top: var(--sp-6); }
.mt-7 { margin-top: var(--sp-7); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-3 { margin-bottom: var(--sp-3); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.mb-7 { margin-bottom: var(--sp-7); }

.grid-auto {
  display: grid;
  gap: var(--sp-6);
}

@media (min-width: 640px) {
  .grid-auto--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-auto--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-auto--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid-auto--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-auto--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.accent-cyan { --accent: var(--p-cyan-400); --accent-soft: var(--p-cyan-300); --accent-tint: rgba(34, 211, 238, 0.12); }
.accent-emerald { --accent: var(--p-emerald-400); --accent-soft: var(--p-emerald-300); --accent-tint: rgba(16, 185, 129, 0.12); }
.accent-violet { --accent: var(--p-violet-400); --accent-soft: var(--p-violet-300); --accent-tint: rgba(167, 139, 250, 0.12); }