:root {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-muted: #475569;
  --primary: #0b7a4b;
  --primary-hover: #086038;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(15, 23, 42, .06);
  --touch-min: 48px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --text: #f1f5f9;
    --text-muted: #cbd5e1;
    --primary: #10b981;
    --primary-hover: #34d399;
    --border: #334155;
    --shadow: 0 2px 12px rgba(0,0,0,.35);
  }
}
html[data-theme="light"] { color-scheme: light; }
html[data-theme="dark"]  { color-scheme: dark; }

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; }
.logo { font-size: 24px; }
.brand-name { font-weight: 700; font-size: 18px; }
.icon-btn {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: transparent; border: 1px solid var(--border);
  border-radius: 50%; font-size: 18px; color: var(--text);
}
.icon-btn:active { transform: scale(.95); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--touch-min);
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600; font-size: 16px;
  border: 2px solid transparent;
  transition: background .15s, transform .1s;
  text-align: center;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-card); }
.btn-lg { padding: 16px 32px; font-size: 18px; }
.btn-block { width: 100%; margin-top: 4px; }
.btn[disabled] { opacity: .6; cursor: not-allowed; }

.accueil { padding: 24px 16px 48px; max-width: 720px; margin: 0 auto; }
.hero { text-align: center; padding: 24px 0 40px; }
.hero h1 {
  font-size: clamp(26px, 7vw, 40px);
  line-height: 1.2; margin: 0 0 12px; color: var(--text);
}
.hero-sub { color: var(--text-muted); font-size: 17px; margin: 0 0 28px; }
.hero-actions {
  display: flex; flex-direction: column; gap: 12px;
  max-width: 360px; margin: 0 auto;
}
.hero-note { color: var(--text-muted); font-size: 14px; margin-top: 24px; }

.features {
  display: grid; gap: 14px;
  grid-template-columns: 1fr 1fr;
  margin: 24px 0 40px;
}
@media (max-width: 380px) { .features { grid-template-columns: 1fr; } }
.feature {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 14px;
  box-shadow: var(--shadow);
}
.feature-icon { font-size: 30px; margin-bottom: 8px; }
.feature h3 { font-size: 16px; margin: 0 0 4px; }
.feature p { font-size: 14px; color: var(--text-muted); margin: 0; }

.steps { margin: 24px 0 40px; }
.steps h2 { font-size: 22px; text-align: center; margin-bottom: 20px; }
.steps ol {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 12px;
  counter-reset: step;
}
.steps li {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px 14px 56px;
  position: relative; counter-increment: step;
}
.steps li::before {
  content: counter(step);
  position: absolute; left: 14px; top: 50%;
  transform: translateY(-50%);
  width: 30px; height: 30px;
  background: var(--primary); color: #fff;
  border-radius: 50%; display: grid; place-items: center;
  font-weight: 700; font-size: 14px;
}

.cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #fff; border-radius: var(--radius);
  padding: 32px 24px; text-align: center;
}
.cta h2 { margin: 0 0 20px; font-size: 22px; }
.cta .btn-primary { background: #fff; color: var(--primary); }
.cta .btn-primary:hover { background: #f0fdf4; }

.footer {
  text-align: center; padding: 24px 16px;
  color: var(--text-muted); font-size: 13px;
}

/* ===== Pages auth ===== */
.auth-page { max-width: 480px; margin: 0 auto; padding: 24px 16px 48px; }
.auth-page h1 { font-size: 26px; margin: 8px 0 4px; text-align: center; }
.auth-sub { color: var(--text-muted); text-align: center; margin: 0 0 28px; }

.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; font-size: 15px; margin-bottom: 6px; color: var(--text); }
.field input, .field select {
  width: 100%; min-height: 48px; padding: 12px 14px;
  font-size: 16px; border: 1.5px solid var(--border);
  border-radius: var(--radius); background: var(--bg-card);
  color: var(--text); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(11, 122, 75, .15);
}
.field .hint { display: block; font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 380px) { .field-row { grid-template-columns: 1fr; } }

.bloc-langues {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 16px; margin-bottom: 18px;
  background: rgba(11, 122, 75, .04);
}

.message { padding: 12px 14px; border-radius: var(--radius); font-size: 14px; margin-bottom: 18px; line-height: 1.4; }
.message.error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.message.success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
html[data-theme="dark"] .message.error { background: #3f1a1a; color: #fca5a5; border-color: #7f1d1d; }
html[data-theme="dark"] .message.success { background: #0f2e1f; color: #86efac; border-color: #166534; }

.auth-alt { text-align: center; margin-top: 24px; font-size: 15px; color: var(--text-muted); }
.auth-alt a { color: var(--primary); font-weight: 600; }

.db-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.db-card h2 { font-size: 18px; margin: 0 0 8px; }
.db-card p { margin: 4px 0; color: var(--text-muted); font-size: 15px; }
.db-badge {
  display: inline-block; background: rgba(11, 122, 75, .12);
  color: var(--primary); font-weight: 700;
  padding: 4px 10px; border-radius: 999px;
  font-size: 13px; margin-right: 6px;
}