:root {
  --bg: #060f24;
  --text: #d7e0ee;
  --text-dim: #8fa0bd;
  --accent: #3f74ff;
  --radius: 20px;

  --glass-tint: linear-gradient(135deg, rgba(63,116,255,0.32), rgba(23,201,166,0.32));
  --glass-tint-strong: linear-gradient(135deg, rgba(63,116,255,0.44), rgba(23,201,166,0.44));
  --glass-surface: rgba(6,14,32,0.38);
  --glass-surface-strong: rgba(6,14,32,0.55);
  --glass-blur: blur(24px) saturate(170%);
  --glass-blur-soft: blur(14px) saturate(160%);
  --glass-border: rgba(201,212,227,0.4);
  --glass-border-width: 1px 1.5px 1.5px 1px;
  --glass-highlight: inset 0 1px 0 rgba(201,212,227,0.5);
  --glass-ring:
    inset 1px 0 0 0 rgba(201,212,227,0.35),
    inset 0 1px 0 0 rgba(201,212,227,0.35),
    inset -1.5px 0 0 0 rgba(2,6,16,0.55),
    inset 0 -1.5px 0 0 rgba(2,6,16,0.55);
  --glass-shadow-strong: 0 26px 70px rgba(2,6,16,0.6), var(--glass-highlight), var(--glass-ring);

  --accent-gradient: linear-gradient(135deg, #3f74ff 0%, #17c9a6 100%);

  --page-gradient:
    radial-gradient(circle at 88% 4%, #4d7dff 0%, #2650c2 40%, #16307a 60%, transparent 64%),
    radial-gradient(circle at 6% 96%, #23e0bd 0%, #12a488 40%, #0a6f5c 60%, transparent 64%),
    linear-gradient(-42deg, transparent 47%, rgba(201,212,227,0.28) 50%, transparent 53%),
    var(--bg);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--page-gradient);
  background-attachment: fixed;
  background-repeat: no-repeat;
}

.cover-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  text-align: center;
}

.lang-switch {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 8px;
}

.lang-btn {
  background: var(--glass-tint), var(--glass-surface);
  -webkit-backdrop-filter: var(--glass-blur-soft);
  backdrop-filter: var(--glass-blur-soft);
  border-style: solid;
  border-color: var(--glass-border);
  border-width: var(--glass-border-width);
  border-radius: 10px;
  box-shadow: var(--glass-ring);
  color: var(--text);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 6px 12px;
  cursor: pointer;
  transition: transform 0.15s ease;
}
.lang-btn:hover { transform: translateY(-1px); }
.lang-btn.is-active {
  background: var(--glass-tint-strong), var(--glass-surface-strong);
  border-color: var(--accent);
}

/* Carte principale : même recette que .auth-card dans style2.css (login.php),
   c'est la référence la plus proche visuellement (carte centrée seule sur
   fond dégradé). */
.cover-card {
  background: var(--glass-tint-strong), var(--glass-surface-strong);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-style: solid;
  border-color: var(--glass-border);
  border-width: var(--glass-border-width);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow-strong);
  padding: 48px 40px;
  width: 100%;
  max-width: 460px;
}

.cover-logo {
  max-height: 88px;
  margin-bottom: 16px;
}

/* Titre en dégradé bleu -> teal, même technique que .brand span dans
   style2.css (header.php). */
.cover-card h1 {
  margin: 0 0 6px;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.cover-subtitle {
  color: var(--text);
  margin: 0 0 20px;
  font-size: 1rem;
  font-weight: 600;
}

.cover-desc {
  color: var(--text-dim);
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
}

.cover-footer {
  margin-top: 24px;
  color: var(--text-dim);
  font-size: 0.78rem;
  opacity: 0.7;
}