/* Reset minimal et variables */
* { box-sizing: border-box; }
html { color-scheme: light; }
:root {
  --bg: #ffffff;
  --fg: #0f172a; /* gris bleuté foncé */
  --muted: #475569;
  --brand: #3b82f6; /* bleu */
  --brand-contrast: #0b3b8a;
  --border: #e2e8f0;
  --card: #f8fafc;
}

html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6; font-size: 16px;
}

/* Containers */
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.container.narrow { max-width: 800px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.9); backdrop-filter: saturate(180%) blur(6px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { text-decoration: none; color: var(--fg); font-weight: 700; letter-spacing: 0.2px; }
.logo { display: inline-block; padding: 6px 10px; border: 2px solid var(--fg); border-radius: 8px; }
.nav a { margin-left: 16px; text-decoration: none; color: var(--fg); padding: 6px 8px; border-radius: 8px; }
.nav a:hover { background: var(--card); }

/* Hero */
.hero { padding: 96px 0 72px; background: linear-gradient(180deg, #eef2ff 0%, #ffffff 100%); border-bottom: 1px solid var(--border); }
.hero h1 { font-size: 40px; line-height: 1.2; margin: 0 0 12px; }
.subtitle { font-size: 20px; color: var(--muted); margin: 0 0 16px; }
.lede { font-size: 18px; max-width: 800px; }
.cta-row { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }

/* Buttons */
.btn { display: inline-block; padding: 12px 16px; border-radius: 10px; border: 1px solid var(--border); text-decoration: none; font-weight: 600; }
.btn-primary { background: var(--brand); color: white; border-color: var(--brand); }
.btn-primary:hover { background: var(--brand-contrast); border-color: var(--brand-contrast); }
.btn-outline { background: transparent; color: var(--fg); }
.btn-outline:hover { background: var(--card); }

/* Sections */
.section { padding: 72px 0; }
.section.alt { background: #fafafa; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: 28px; margin-top: 0; }
.two-col { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 900px) { .two-col { grid-template-columns: 2fr 1fr; } }

/* Card */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }

/* Features */
.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.feature-list li { padding: 14px 0; border-bottom: 1px dashed var(--border); }
.feature-list li:last-child { border-bottom: 0; }
.feature-list h3 { margin: 0 0 4px; font-size: 18px; }

/* Social */
.social-list { list-style: none; padding: 0; margin: 0 0 12px; }
.social-list li { margin-bottom: 6px; }
.social-list a { text-decoration: none; color: var(--brand-contrast); }
.social-list a:hover { text-decoration: underline; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: #fff; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; }
.footer-nav a { margin-left: 16px; text-decoration: none; color: var(--muted); }
.footer-nav a:hover { color: var(--fg); }

/* Utilities */
.muted { color: var(--muted); }