/* ============================================================
   EduThunder Admin — Theme
   Deep indigo base + electric-violet primary + amber "thunder" accent
   ============================================================ */

:root {
  --et-bg: #0F1123;
  --et-surface: #171933;
  --et-surface-2: #1E2142;
  --et-border: #2A2D52;
  --et-text: #E8E9F3;
  --et-text-muted: #8B8DA8;
  --et-primary: #6C5CE7;
  --et-primary-hover: #7D6FF5;
  --et-thunder: #FFC93C;
  --et-danger: #FF5C7A;
  --et-success: #2ED9A7;
  --et-radius: 14px;
}

* { box-sizing: border-box; }

body {
  background: var(--et-bg);
  color: var(--et-text);
  font-family: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, .brand-mark {
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* ---------- Brand mark (lightning bolt signature) ---------- */
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  color: var(--et-text);
  text-decoration: none;
}
.brand-mark svg { flex-shrink: 0; }
.brand-mark .brand-edu { color: var(--et-text); }
.brand-mark .brand-thunder { color: var(--et-thunder); }

/* ---------- Layout ---------- */
.et-sidebar {
  background: var(--et-surface);
  border-right: 1px solid var(--et-border);
  min-height: 100vh;
  width: 250px;
  position: fixed;
  top: 0; left: 0;
  padding: 24px 16px;
  overflow-y: auto;
}
.et-main {
  margin-left: 250px;
  padding: 28px 32px;
}
.et-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--et-border);
}

/* ---------- Nav ---------- */
.et-nav-group-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--et-text-muted);
  margin: 20px 8px 8px;
}
.et-nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--et-text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 2px;
  border-left: 3px solid transparent;
  transition: background 0.15s ease, color 0.15s ease;
}
.et-nav-link:hover {
  background: var(--et-surface-2);
  color: var(--et-text);
}
.et-nav-link.active {
  background: var(--et-surface-2);
  color: var(--et-text);
  border-left: 3px solid var(--et-thunder);
}
.et-nav-link.disabled {
  opacity: 0.4;
  pointer-events: none;
}
.et-nav-badge {
  margin-left: auto;
  font-size: 0.62rem;
  padding: 2px 7px;
  border-radius: 20px;
  background: var(--et-surface);
  border: 1px solid var(--et-border);
  color: var(--et-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---------- Cards ---------- */
.et-card {
  background: var(--et-surface);
  border: 1px solid var(--et-border);
  border-radius: var(--et-radius);
  padding: 22px;
}
.et-stat-card {
  background: linear-gradient(155deg, var(--et-surface) 0%, var(--et-surface-2) 100%);
  border: 1px solid var(--et-border);
  border-radius: var(--et-radius);
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.et-stat-card:hover {
  border-color: var(--et-primary);
  transform: translateY(-2px);
}
.et-stat-card .et-stat-value {
  font-size: 2rem;
  font-weight: 800;
  margin: 6px 0 2px;
}
.et-stat-card .et-stat-label {
  font-size: 0.8rem;
  color: var(--et-text-muted);
  font-weight: 600;
}
.et-stat-card.et-locked .et-stat-value { color: var(--et-text-muted); }

/* ---------- Forms / buttons ---------- */
.et-input {
  background: var(--et-surface-2);
  border: 1px solid var(--et-border);
  color: var(--et-text);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 0.92rem;
  width: 100%;
}
.et-input:focus {
  outline: none;
  border-color: var(--et-primary);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.25);
}
.et-btn-primary {
  background: var(--et-primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 11px 20px;
  font-weight: 700;
  font-size: 0.92rem;
  transition: background 0.15s ease;
}
.et-btn-primary:hover { background: var(--et-primary-hover); color: #fff; }

/* ---------- Table ---------- */
.et-table { color: var(--et-text); }
.et-table thead th {
  color: var(--et-text-muted);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--et-border);
  font-weight: 700;
  padding: 10px 12px;
}
.et-table td {
  border-bottom: 1px solid var(--et-border);
  padding: 12px;
  vertical-align: middle;
  font-size: 0.9rem;
}
.et-badge {
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
}
.et-badge-active { background: rgba(46, 217, 167, 0.15); color: var(--et-success); }
.et-badge-suspended { background: rgba(255, 92, 122, 0.15); color: var(--et-danger); }

/* ---------- Login page ---------- */
.et-login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(108, 92, 231, 0.18), transparent 45%),
    radial-gradient(circle at 80% 80%, rgba(255, 201, 60, 0.10), transparent 40%),
    var(--et-bg);
}
.et-login-card {
  background: var(--et-surface);
  border: 1px solid var(--et-border);
  border-radius: 18px;
  padding: 40px 36px;
  width: 100%;
  max-width: 380px;
}
.et-alert {
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin-bottom: 16px;
}
.et-alert-danger { background: rgba(255, 92, 122, 0.12); color: var(--et-danger); border: 1px solid rgba(255, 92, 122, 0.3); }

@media (max-width: 768px) {
  .et-sidebar { transform: translateX(-100%); transition: transform 0.2s ease; z-index: 1000; }
  .et-sidebar.open { transform: translateX(0); }
  .et-main { margin-left: 0; padding: 20px; }
}