:root {
  --bg: #0f1419;
  --panel: #1a212b;
  --panel-2: #232c39;
  --border: #2e3a4a;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #4aa3ff;
  --accent-2: #38d39f;
  --warn: #ff6b6b;
  --code-bg: #0c1117;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---------- Layout ---------- */
.layout { display: flex; align-items: flex-start; }

.sidebar {
  position: sticky;
  top: 0;
  width: 280px;
  height: 100vh;
  overflow-y: auto;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 22px 18px 60px;
}
.sidebar h1 {
  font-size: 18px;
  margin: 0 0 4px;
  color: #fff;
}
.sidebar .tag { color: var(--muted); font-size: 12px; margin-bottom: 18px; }
.sidebar nav a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 7px;
  font-size: 14px;
  border-left: 2px solid transparent;
}
.sidebar nav a:hover { background: var(--panel-2); color: var(--text); }
.sidebar nav a.section-title {
  margin-top: 16px;
  color: var(--accent);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
  pointer-events: none;
}
.sidebar nav a.active { color: #fff; border-left-color: var(--accent); background: var(--panel-2); }

.content {
  flex: 1;
  min-width: 0;
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 38px 120px;
}

/* ---------- Typography ---------- */
.content h2 {
  font-size: 28px;
  margin: 56px 0 6px;
  padding-top: 10px;
  color: #fff;
  border-top: 1px solid var(--border);
}
.content h2:first-of-type { border-top: none; margin-top: 8px; }
.content h2 .num {
  display: inline-block;
  background: var(--accent);
  color: #04121f;
  font-size: 14px;
  font-weight: 800;
  border-radius: 6px;
  padding: 2px 9px;
  margin-right: 10px;
  vertical-align: middle;
}
.content h3 { font-size: 19px; margin: 28px 0 6px; color: #fff; }
.content p { color: var(--text); }
.content a { color: var(--accent); }
.lead { font-size: 18px; color: var(--muted); }
.muted { color: var(--muted); }

.hero {
  background: linear-gradient(135deg, #16202e, #0f1419);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 32px;
  margin-bottom: 10px;
}
.hero h1 { margin: 0 0 8px; font-size: 34px; color: #fff; }

ul.clean { padding-left: 20px; }
ul.clean li { margin: 4px 0; }

.note, .tip, .warn-box {
  border-radius: 8px;
  padding: 12px 16px;
  margin: 16px 0;
  font-size: 15px;
  border-left: 4px solid var(--accent);
  background: rgba(74,163,255,.08);
}
.tip { border-left-color: var(--accent-2); background: rgba(56,211,159,.08); }
.warn-box { border-left-color: var(--warn); background: rgba(255,107,107,.08); }
.note b, .tip b, .warn-box b { color: #fff; }

table.api { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
table.api th, table.api td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
table.api th { color: var(--accent); }
table.api code { color: var(--accent-2); }

code.inline {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 13px;
  color: var(--accent-2);
}

/* ---------- Demo component ---------- */
.demo {
  display: grid;
  grid-template-columns: minmax(0, 360px) 1fr;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 18px 0 26px;
  background: var(--panel);
}
.demo .stage {
  background:
    linear-gradient(45deg, #1d2530 25%, transparent 25%) -10px 0/20px 20px,
    linear-gradient(-45deg, #1d2530 25%, transparent 25%) -10px 0/20px 20px,
    linear-gradient(45deg, transparent 75%, #1d2530 75%) -10px 0/20px 20px,
    linear-gradient(-45deg, transparent 75%, #1d2530 75%) -10px 0/20px 20px,
    #151b24;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border-right: 1px solid var(--border);
}
.demo canvas {
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 6px 20px rgba(0,0,0,.4);
  max-width: 100%;
  touch-action: none;
}
.demo .code { display: flex; flex-direction: column; background: var(--code-bg); min-width: 0; }
.demo textarea {
  flex: 1;
  width: 100%;
  border: none;
  resize: none;
  background: var(--code-bg);
  color: #d7e3ef;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.55;
  padding: 14px 16px;
  outline: none;
  white-space: pre;
  overflow-x: auto;
  tab-size: 2;
}
.demo .bar {
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  background: var(--panel);
  align-items: center;
}
.demo .bar button {
  background: var(--accent);
  color: #04121f;
  border: none;
  border-radius: 6px;
  padding: 6px 14px;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
}
.demo .bar button.reset { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.demo .bar button:hover { filter: brightness(1.1); }
.demo .bar .hint { margin-left: auto; color: var(--muted); font-size: 12px; }
.demo .err {
  grid-column: 1 / -1;
  background: rgba(255,107,107,.12);
  color: #ffb3b3;
  font-family: monospace;
  font-size: 13px;
  padding: 8px 16px;
  border-top: 1px solid var(--warn);
}
.demo.has-error { border-color: var(--warn); }

@media (max-width: 820px) {
  .sidebar { display: none; }
  .demo { grid-template-columns: 1fr; }
  .demo .stage { border-right: none; border-bottom: 1px solid var(--border); }
  .content { padding: 24px 18px 100px; }
}

/* ---------- Bouton + fenêtre "Agrandir" ---------- */
.demo .bar button.fs {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.fs-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(5, 8, 12, .85);
  backdrop-filter: blur(2px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 22px;
}
.fs-overlay.open { display: flex; }
body.fs-lock { overflow: hidden; }

.fs-inner {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: min(1100px, 96vw);
  max-height: 94vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
}
.fs-close {
  position: absolute;
  top: 10px; right: 12px;
  z-index: 3;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 7px 14px;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
}
.fs-close:hover { background: var(--warn); color: #fff; border-color: var(--warn); }
.fs-host { overflow: auto; padding: 14px; }

.demo.fs-active {
  grid-template-columns: 1fr;
  border: none;
  margin: 0;
  background: transparent;
}
.demo.fs-active .stage {
  border-right: none;
  border-bottom: 1px solid var(--border);
  padding: 26px;
}
.demo.fs-active canvas {
  width: min(760px, 86vw);
  height: auto;
  image-rendering: auto;
}
.demo.fs-active textarea { font-size: 15px; line-height: 1.6; }

/* ---------- Étapes progressives ---------- */
.steps { margin: 18px 0 10px; }
.step {
  border-left: 3px solid var(--border);
  padding: 2px 0 2px 20px;
  margin: 0 0 8px;
  position: relative;
}
.step::before {
  content: "";
  position: absolute;
  left: -8px; top: 16px;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
}
.step:last-child { border-left-color: transparent; }
.step-head {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin: 8px 0 2px;
}
.step-num {
  display: inline-block;
  background: var(--accent);
  color: #04121f;
  font-size: 12px;
  font-weight: 800;
  border-radius: 20px;
  padding: 2px 11px;
  margin-right: 9px;
  vertical-align: middle;
}
.step.final .step-num { background: var(--accent-2); }
.step p { margin: 4px 0 6px; font-size: 15px; color: var(--muted); }
.step .demo { margin: 8px 0 14px; }

footer {
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding-top: 20px;
}