/* ===== LMS Pages — Deep Blue + White design system ===== */
:root {
  --primary: #1e3a8a;       /* Deep blue */
  --primary-600: #1d4ed8;
  --primary-500: #2563eb;
  --primary-400: #3b82f6;
  --primary-50: #eff6ff;
  --accent: #f59e0b;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --danger: #dc2626;
  --success: #16a34a;
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.06);
  --shadow: 0 4px 16px rgba(15,23,42,0.08);
  --shadow-lg: 0 16px 40px rgba(15,23,42,0.16);
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary-500); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============== AUTH PAGE ============== */
.auth-body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at -10% -20%, rgba(59,130,246,0.25), transparent 60%),
    radial-gradient(900px 600px at 110% 120%, rgba(30,58,138,0.35), transparent 55%),
    linear-gradient(135deg, #0b1e4a 0%, #1e3a8a 50%, #1d4ed8 100%);
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-shell {
  width: 100%;
  max-width: 1040px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.auth-brand {
  padding: 48px 44px;
  color: #fff;
  display: flex; flex-direction: column; gap: 18px; justify-content: center;
}
.auth-brand h1 { font-size: 32px; margin: 0; letter-spacing: -0.02em; }
.auth-brand p { color: rgba(255,255,255,0.85); margin: 0; line-height: 1.55; }
.brand-mark {
  width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(135deg, #fff, #dbeafe);
  display: grid; place-items: center; color: var(--primary);
  font-size: 24px; box-shadow: var(--shadow);
}
.brand-mark.sm { width: 38px; height: 38px; font-size: 18px; border-radius: 10px; }
.brand-points { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 10px; }
.brand-points li { color: rgba(255,255,255,0.9); display: flex; gap: 10px; align-items: center; }
.brand-points i { color: #fcd34d; }

.auth-card {
  background: var(--surface);
  padding: 44px 40px;
  display: flex; flex-direction: column; justify-content: center; gap: 18px;
}
.auth-card h2 { margin: 0; font-size: 24px; letter-spacing: -0.01em; }
.auth-card .muted { color: var(--muted); margin: 0 0 8px; }
.auth-form { display: grid; gap: 14px; }
.auth-form label > span { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: #334155; }
.input-wrap {
  position: relative;
}
.input-wrap i {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  color: var(--muted);
}
.input-wrap input {
  width: 100%;
  padding: 12px 14px 12px 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  background: #fff;
}
.input-wrap input:focus {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 4px rgba(37,99,235,0.15);
}
.auth-foot { color: var(--muted); text-align: center; margin-top: 4px; }
.auth-foot code { background: var(--primary-50); color: var(--primary); padding: 2px 6px; border-radius: 6px; }

/* ============== BUTTONS ============== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid transparent;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: transform .05s ease, background .15s, border-color .15s, color .15s;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-600); border-color: var(--primary-600); }
.btn-ghost {
  background: transparent; color: #fff; border-color: rgba(255,255,255,0.2);
}
.btn-ghost:hover { background: rgba(255,255,255,0.08); }
.btn-outline {
  background: #fff; color: var(--primary); border-color: var(--border);
}
.btn-outline:hover { border-color: var(--primary-500); color: var(--primary-600); }
.btn-danger {
  background: var(--danger); color: #fff; border-color: var(--danger);
}
.btn-danger:hover { filter: brightness(0.95); }
.btn-sm { padding: 6px 10px; font-size: 13px; border-radius: 8px; }
.btn.full { width: 100%; }

.alert {
  padding: 10px 12px; border-radius: 10px; font-size: 14px;
  display: flex; gap: 8px; align-items: center;
}
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }

/* ============== APP SHELL ============== */
.app-body {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
  background: var(--bg);
}
.sidebar {
  background: linear-gradient(180deg, #0b1e4a 0%, #1e3a8a 100%);
  color: #fff;
  display: flex; flex-direction: column;
  padding: 18px 14px;
  position: sticky; top: 0; height: 100vh;
}
.sb-brand {
  display: flex; align-items: center; gap: 10px; padding: 6px 8px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sb-title { font-weight: 700; letter-spacing: -0.01em; }
.sb-sub { color: rgba(255,255,255,0.7); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.sb-nav { display: flex; flex-direction: column; gap: 4px; padding-top: 14px; flex: 1; }
.sb-nav a {
  color: rgba(255,255,255,0.85);
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  font-size: 14px; font-weight: 500;
  cursor: pointer;
}
.sb-nav a:hover { background: rgba(255,255,255,0.08); text-decoration: none; color: #fff; }
.sb-nav a.active { background: rgba(255,255,255,0.14); color: #fff; }
.sb-nav a i { width: 18px; text-align: center; color: #93c5fd; }
.sb-foot {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 12px;
  display: grid; gap: 10px;
}
.sb-user { display: flex; gap: 10px; align-items: center; padding: 6px 8px; }
.sb-user .avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: #fff; color: var(--primary);
  display: grid; place-items: center; font-weight: 700;
}
.sb-user .name { color: #fff; font-weight: 600; font-size: 14px; }
.sb-user .small { font-size: 11px; color: rgba(255,255,255,0.7); }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 28px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
.topbar h1 { font-size: 18px; margin: 0; letter-spacing: -0.01em; }
.spacer { flex: 1; }
.topbar-user { color: var(--muted); font-size: 14px; }

.icon-btn {
  background: transparent; border: 1px solid var(--border);
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center; cursor: pointer; color: #334155;
}
.icon-btn:hover { border-color: var(--primary-500); color: var(--primary); }

.view-root { padding: 28px; }
.loading { padding: 40px; color: var(--muted); display: flex; gap: 10px; align-items: center; }

/* ============== CARDS / GRID ============== */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; gap: 10px;
}
.card h3 { margin: 0; font-size: 16px; letter-spacing: -0.01em; }
.card .muted { color: var(--muted); font-size: 13px; }
.card .row { display: flex; gap: 8px; flex-wrap: wrap; }

.stat-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; display: flex; gap: 14px; align-items: center;
}
.stat .ico {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--primary-50); color: var(--primary);
  display: grid; place-items: center; font-size: 18px;
}
.stat .num { font-size: 22px; font-weight: 700; line-height: 1; }
.stat .lbl { color: var(--muted); font-size: 13px; margin-top: 4px; }

.section-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; gap: 12px; flex-wrap: wrap;
}
.section-head h2 { margin: 0; font-size: 20px; letter-spacing: -0.01em; }

/* ============== TABLES ============== */
.table-wrap { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
table.tbl th, table.tbl td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
table.tbl th { background: #f8fafc; font-weight: 600; color: #334155; font-size: 13px; }
table.tbl tr:last-child td { border-bottom: 0; }
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
  background: var(--primary-50); color: var(--primary);
}
.badge.gray { background: #f1f5f9; color: #475569; }
.badge.green { background: #dcfce7; color: #166534; }
.badge.amber { background: #fef3c7; color: #92400e; }
.badge.red { background: #fee2e2; color: #991b1b; }

/* ============== FORMS ============== */
.form-grid { display: grid; gap: 14px; }
.form-grid label > span { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: #334155; }
.form-grid input, .form-grid select, .form-grid textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 14px; font-family: inherit; outline: none;
  background: #fff;
}
.form-grid input:focus, .form-grid select:focus, .form-grid textarea:focus {
  border-color: var(--primary-500); box-shadow: 0 0 0 4px rgba(37,99,235,0.15);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* Quill */
#quillEditor { background: #fff; min-height: 220px; border-radius: 0 0 10px 10px; }
.ql-toolbar.ql-snow { border-radius: 10px 10px 0 0; border-color: var(--border); }
.ql-container.ql-snow { border-color: var(--border); }

/* Material content rendering (sanitized HTML from Quill) */
.material-view { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.material-view img { max-width: 100%; border-radius: 8px; }
.material-view iframe { max-width: 100%; border: 0; aspect-ratio: 16/9; width: 100%; border-radius: 8px; }

/* ============== MODAL ============== */
/* CRITICAL: ensure [hidden] always wins over .modal display rules so the
   popup does NOT auto-open on page load. */
.modal[hidden],
[hidden] { display: none !important; }
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(15,23,42,0.55); cursor: pointer; }
.modal-card {
  position: relative; background: #fff; border-radius: 14px; box-shadow: var(--shadow-lg);
  width: min(720px, 92vw); max-height: 88vh; display: flex; flex-direction: column;
}
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-head h3 { margin: 0; font-size: 17px; }
.modal-body { padding: 18px 20px; overflow: auto; }
.modal-foot { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

/* ============== TOAST ============== */
.toast {
  position: fixed; right: 22px; bottom: 22px; z-index: 100;
  padding: 12px 16px; border-radius: 12px; box-shadow: var(--shadow-lg);
  background: #0f172a; color: #fff; font-size: 14px; font-weight: 500;
}
.toast.success { background: #166534; }
.toast.error { background: #991b1b; }

/* ============== UTILS ============== */
.muted { color: var(--muted); }
.small { font-size: 12px; }
.flex { display: flex; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.between { justify-content: space-between; }
.center { align-items: center; }
.mt-2 { margin-top: 8px; } .mt-3 { margin-top: 12px; } .mt-4 { margin-top: 16px; }
.empty { padding: 40px; text-align: center; color: var(--muted); background: #fff; border: 1px dashed var(--border); border-radius: var(--radius); }

/* ============== RESPONSIVE ============== */
.only-mobile { display: none; }
@media (max-width: 900px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-brand { padding: 32px 28px; }
  .app-body { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; left: 0; top: 0; height: 100vh; width: 260px;
    transform: translateX(-100%); transition: transform .2s ease;
    z-index: 30;
  }
  .sidebar.open { transform: translateX(0); }
  .only-mobile { display: inline-grid; }
  .form-row { grid-template-columns: 1fr; }
}

/* ============== PROFILE PHOTO SUPPORT ============== */
.user-photo {
  width: 36px; height: 36px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--border);
  background: #e2e8f0;
}
.user-photo.lg { width: 96px; height: 96px; border: 3px solid var(--primary-50); }
.user-photo.sm { width: 28px; height: 28px; }
.photo-cell { display: flex; align-items: center; gap: 10px; }
.photo-uploader {
  display: flex; align-items: center; gap: 14px;
  padding: 12px; border: 1px dashed var(--border);
  border-radius: var(--radius); background: #f8fafc;
}
.photo-preview {
  width: 84px; height: 84px; border-radius: 50%;
  background: #e2e8f0 center/cover no-repeat;
  border: 2px solid var(--border); flex: 0 0 84px;
  display: grid; place-items: center; color: var(--muted);
}
.photo-actions { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.photo-actions input[type=file] { font-size: 13px; }
.profile-card {
  display: flex; gap: 18px; align-items: center;
  background: #fff; padding: 18px; border-radius: var(--radius);
  border: 1px solid var(--border); margin-bottom: 18px;
}
.profile-card .meta-large { font-size: 18px; font-weight: 700; }
.readonly-note {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; background: #fef3c7; color: #92400e;
  border-radius: 999px; font-size: 12px; font-weight: 600;
}

/* Quill content render area */
.material-view { line-height: 1.65; }
.material-view img, .material-view iframe { max-width: 100%; border-radius: 8px; }
.material-view h1 { font-size: 22px; margin: 12px 0; }
.material-view h2 { font-size: 18px; margin: 10px 0; }
.material-view blockquote {
  border-left: 4px solid var(--primary-400);
  padding: 6px 12px; color: var(--muted); margin: 10px 0;
  background: #f8fafc;
}
.material-view pre {
  background: #0f172a; color: #e2e8f0; padding: 12px;
  border-radius: 8px; overflow-x: auto;
}
#quillEditor { height: 320px; background: #fff; border-radius: 8px; }
.ql-editor { min-height: 280px; font-size: 14px; }