:root {
  --navy-950: #050b1f;
  --navy-900: #0a1330;
  --navy-800: #0f1b3d;
  --navy-700: #16244d;
  --blue-500: #3b82f6;
  --blue-400: #60a5fa;
  --blue-300: #93c5fd;
  --cyan-400: #22d3ee;
  --text-main: #e8ecfb;
  --text-muted: #93a0c4;
  --border-soft: rgba(147, 165, 220, 0.16);
  --radius: 14px;
  --green: #4ade80;
  --red: #f87171;
  --amber: #fbbf24;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--navy-950);
  color: var(--text-main);
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
}

a { color: var(--blue-300); }

/* Login */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-box {
  width: 100%;
  max-width: 380px;
  background: linear-gradient(180deg, var(--navy-800), var(--navy-900));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 36px;
}
.login-box h1 { font-size: 1.3rem; margin-bottom: 4px; }
.login-box p.sub { color: var(--text-muted); margin-bottom: 24px; font-size: 0.9rem; }

/* Layout */
.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(10, 19, 48, 0.7);
}
.admin-header .brand { font-weight: 700; }
.admin-header .brand span { color: var(--blue-400); }
.admin-nav { display: flex; gap: 22px; }
.admin-nav a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; }
.admin-nav a.active, .admin-nav a:hover { color: var(--blue-300); }

.admin-main { max-width: 1100px; margin: 0 auto; padding: 32px 24px 60px; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.page-header h1 { font-size: 1.5rem; }

/* Cards / table */
.card {
  background: linear-gradient(180deg, var(--navy-800), var(--navy-900));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 28px; }
.stat-box { background: linear-gradient(180deg, var(--navy-800), var(--navy-900)); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 20px; text-align: center; }
.stat-box .num { font-size: 1.8rem; font-weight: 700; color: var(--blue-300); display: block; }
.stat-box .lbl { color: var(--text-muted); font-size: 0.85rem; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--border-soft); font-size: 0.92rem; }
th { color: var(--text-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.4px; }
tr:last-child td { border-bottom: none; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge-etude { background: rgba(251, 191, 36, 0.15); color: var(--amber); }
.badge-en_cours { background: rgba(96, 165, 250, 0.15); color: var(--blue-300); }
.badge-en_ligne { background: rgba(74, 222, 128, 0.15); color: var(--green); }
.badge-maintenance { background: rgba(248, 113, 113, 0.15); color: var(--red); }

/* Forms */
.form-group { margin-bottom: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text-muted); margin-bottom: 8px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--blue-400);
}
.form-hint { color: var(--text-muted); font-size: 0.78rem; margin-top: 6px; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.btn-primary { background: linear-gradient(90deg, var(--blue-500), var(--cyan-400)); color: var(--navy-950); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { background: rgba(255,255,255,0.04); color: var(--text-main); border: 1px solid var(--border-soft); }
.btn-danger { background: rgba(248, 113, 113, 0.15); color: var(--red); border: 1px solid rgba(248, 113, 113, 0.3); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }

.actions { display: flex; gap: 8px; }

.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 18px; font-size: 0.9rem; }
.alert-error { background: rgba(248, 113, 113, 0.12); color: var(--red); border: 1px solid rgba(248, 113, 113, 0.3); }
.alert-success { background: rgba(74, 222, 128, 0.12); color: var(--green); border: 1px solid rgba(74, 222, 128, 0.3); }

.empty-state { text-align: center; color: var(--text-muted); padding: 40px 20px; }

.timeline { list-style: none; }
.timeline li { padding: 14px 0; border-bottom: 1px solid var(--border-soft); }
.timeline li:last-child { border-bottom: none; }
.timeline .t-date { color: var(--text-muted); font-size: 0.78rem; }
.timeline .t-title { font-weight: 600; margin: 4px 0; }
.timeline .t-note { color: var(--text-muted); font-size: 0.9rem; }

@media (max-width: 700px) {
  .form-row { grid-template-columns: 1fr; }
  .admin-nav { display: none; }
}