@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --bg-primary: #eef1f8;
  --bg-secondary: #ffffff;
  --bg-elevated: #e1e7f3;
  --text-primary: #09233a;
  --text-secondary: #2f405c;
  --text-faint: #7488a3;
  --border-color: #d2dcee;
  --accent-primary: #1d7bcc;
  --accent-soft: rgba(29, 123, 204, 0.09);
  --success: #15803d;
  --success-bg: rgba(21, 128, 61, 0.1);
  --danger: #b91c1c;
  --danger-bg: rgba(185, 28, 28, 0.08);
  --warning: #92400e;
  --warning-bg: rgba(146, 64, 14, 0.1);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.55;
}
h1, h2, h3, h4 { font-weight: 700; margin: 0 0 8px; letter-spacing: -0.01em; }
a { color: inherit; text-decoration: none; }
p { margin: 0 0 12px; color: var(--text-secondary); }
code, .mono { font-family: 'IBM Plex Mono', Consolas, monospace; }

/* ---------- layout ---------- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 22px 0;
  display: flex;
  flex-direction: column;
}
.sidebar .brand {
  padding: 0 20px 22px;
  font-weight: 800;
  font-size: 17px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 14px;
}
.sidebar .brand small { display: block; font-weight: 500; font-size: 11.5px; color: var(--text-faint); margin-top: 3px; text-transform: uppercase; letter-spacing: .06em; }
.sidebar nav { flex: 1; display: flex; flex-direction: column; gap: 2px; padding: 0 10px; }
.sidebar nav a {
  padding: 9px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}
.sidebar nav a:hover { background: var(--bg-elevated); color: var(--text-primary); }
.sidebar nav a.active { background: var(--accent-soft); color: var(--accent-primary); }
.sidebar .user-box { padding: 14px 20px 0; border-top: 1px solid var(--border-color); margin-top: 12px; }
.sidebar .user-box .name { font-weight: 600; font-size: 13.5px; }
.sidebar .user-box .role { font-size: 12px; color: var(--text-faint); text-transform: capitalize; margin-bottom: 10px; }
.sidebar .user-box button {
  width: 100%; background: none; border: 1px solid var(--border-color); color: var(--text-secondary);
  padding: 7px; border-radius: 6px; font-size: 12.5px; cursor: pointer;
}
.sidebar .user-box button:hover { border-color: var(--danger); color: var(--danger); }

.main { flex: 1; min-width: 0; padding: 32px 40px 60px; max-width: 1100px; }
.page-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 26px; flex-wrap: wrap; gap: 10px; }
.page-head h1 { font-size: 24px; }
.page-head .sub { color: var(--text-faint); font-size: 13.5px; }

/* ---------- auth pages ---------- */
.auth-shell { min-height: 100vh; display: grid; place-items: center; background: var(--bg-primary); padding: 20px; }
.auth-card { width: 100%; max-width: 380px; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; padding: 34px 30px; }
.auth-card h1 { font-size: 20px; margin-bottom: 4px; }
.auth-card .sub { margin-bottom: 22px; font-size: 13.5px; }

/* ---------- forms ---------- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12.5px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; text-transform: uppercase; letter-spacing: .04em; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; background: var(--bg-primary); color: var(--text-primary);
  border: 1px solid var(--border-color); border-radius: 7px; padding: 10px 12px; font-size: 14.5px; font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-primary); }
.form-row { display: flex; gap: 14px; }
.form-row .form-group { flex: 1; }
.checkbox-row { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.checkbox-row input { width: auto; }
.checkbox-row label { margin: 0; text-transform: none; font-weight: 500; font-size: 13.5px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--accent-primary); color: #ffffff; border: none; border-radius: 7px;
  padding: 10px 18px; font-size: 14px; font-weight: 700; cursor: pointer; font-family: inherit;
}
.btn:hover { filter: brightness(1.08); }
.btn.btn-secondary { background: none; border: 1px solid var(--border-color); color: var(--text-primary); }
.btn.btn-secondary:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.btn.btn-danger { background: none; border: 1px solid var(--danger); color: var(--danger); }
.btn.btn-sm { padding: 6px 12px; font-size: 12.5px; }
.btn.btn-block { width: 100%; }

.alert { padding: 11px 14px; border-radius: 7px; font-size: 13.5px; margin-bottom: 18px; }
.alert-error { background: var(--danger-bg); color: var(--danger); }
.alert-success { background: var(--success-bg); color: var(--success); }

/* ---------- cards & tables ---------- */
.card { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 10px; padding: 20px 22px; }
.card + .card { margin-top: 16px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 26px; }
.stat-card { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 10px; padding: 16px 18px; }
.stat-card .num { font-size: 26px; font-weight: 800; font-variant-numeric: tabular-nums; }
.stat-card .label { font-size: 12px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .05em; margin-top: 3px; }
.stat-card.warn .num { color: var(--warning); }

table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th { text-align: left; padding: 9px 12px; font-size: 11.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); border-bottom: 1px solid var(--border-color); }
td { padding: 11px 12px; border-bottom: 1px solid var(--border-color); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
.table-wrap { overflow-x: auto; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 10px; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 600; }
.badge-completed { background: var(--success-bg); color: var(--success); }
.badge-in_progress { background: var(--warning-bg); color: var(--warning); }
.badge-not_started { background: var(--bg-elevated); color: var(--text-faint); }
.badge-overdue { background: var(--danger-bg); color: var(--danger); }
.badge-active { background: var(--success-bg); color: var(--success); }
.badge-invited { background: var(--warning-bg); color: var(--warning); }
.badge-deactivated { background: var(--bg-elevated); color: var(--text-faint); }

.progress-bar { height: 6px; background: var(--bg-elevated); border-radius: 999px; overflow: hidden; }
.progress-bar > div { height: 100%; background: var(--accent-primary); }

/* ---------- catalog / course cards ---------- */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.course-card { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 10px; padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.course-card .thumb { height: 90px; background: linear-gradient(135deg, var(--accent-soft), var(--bg-elevated)); border-radius: 7px; display: flex; align-items: center; justify-content: center; font-size: 26px; }
.course-card h3 { font-size: 15.5px; }
.course-card .meta { font-size: 12px; color: var(--text-faint); }

.portfolio-item { display: flex; align-items: center; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border-color); }
.portfolio-item:last-child { border-bottom: none; }
.portfolio-item .info { flex: 1; min-width: 0; }
.portfolio-item .info h3 { font-size: 14.5px; margin-bottom: 3px; }
.portfolio-item .info .meta { font-size: 12px; color: var(--text-faint); }
.portfolio-item .progress-wrap { width: 140px; flex-shrink: 0; }
.portfolio-item .progress-wrap .pct { font-size: 11.5px; color: var(--text-faint); margin-top: 4px; text-align: right; }

/* ---------- lesson player ---------- */
.player-shell { display: flex; gap: 0; min-height: 100vh; }
.player-sidebar { width: 300px; flex-shrink: 0; background: var(--bg-secondary); border-right: 1px solid var(--border-color); padding: 20px 0; overflow-y: auto; }
.player-sidebar .back-link { padding: 0 18px 16px; font-size: 12.5px; color: var(--text-faint); display: block; border-bottom: 1px solid var(--border-color); margin-bottom: 10px; }
.player-sidebar .module-title { padding: 12px 18px 6px; font-size: 11.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); }
.player-sidebar .lesson-link { display: flex; align-items: center; gap: 9px; padding: 9px 18px; font-size: 13.5px; color: var(--text-secondary); }
.player-sidebar .lesson-link:hover { background: var(--bg-elevated); }
.player-sidebar .lesson-link.active { background: var(--accent-soft); color: var(--accent-primary); font-weight: 600; }
.player-sidebar .tick { width: 16px; height: 16px; border-radius: 50%; border: 1.5px solid var(--border-color); flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 10px; }
.player-sidebar .tick.done { background: var(--success); border-color: var(--success); color: #ffffff; }
.player-main { flex: 1; padding: 36px 48px 60px; max-width: 820px; }
.player-main video, .player-main iframe { width: 100%; border-radius: 10px; border: none; background: #000; }
.player-main iframe { aspect-ratio: 16/9; }
.player-content { font-size: 15.5px; line-height: 1.7; margin: 20px 0; }
.player-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border-color); }

.empty-state { text-align: center; padding: 50px 20px; color: var(--text-faint); }
.empty-state .icon { font-size: 32px; margin-bottom: 10px; }

.builder-module { border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 14px; overflow: hidden; }
.builder-module > header { background: var(--bg-elevated); padding: 10px 16px; font-weight: 700; font-size: 13.5px; }
.builder-lesson { display: flex; align-items: center; gap: 10px; padding: 9px 16px; border-top: 1px solid var(--border-color); font-size: 13.5px; }
.builder-lesson .type-tag { font-size: 10.5px; text-transform: uppercase; color: var(--text-faint); background: var(--bg-primary); padding: 2px 7px; border-radius: 4px; }
.builder-lesson form { margin-left: auto; }

@media (max-width: 860px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; overflow-x: auto; padding: 12px; }
  .sidebar .brand, .sidebar .user-box { display: none; }
  .sidebar nav { flex-direction: row; }
  .main { padding: 22px; }
  .player-shell { flex-direction: column; }
  .player-sidebar { width: 100%; }
  .player-main { padding: 24px; }
}