/* Bharat IC LMS — one design system for sign-in, student, teacher and admin pages. */
:root {
  --brand: #ffc815;
  --brand-600: #f0b400;
  --brand-50: #fff8db;
  --ink: #0c0e13;
  --ink-2: #161a22;
  --ink-3: #232836;
  --bg: #f4f5f7;
  --card: #ffffff;
  --line: #e5e7eb;
  --line-2: #eef0f3;
  --text: #111827;
  --muted: #6b7280;
  --ok: #15803d;
  --ok-50: #ecfdf3;
  --danger: #dc2626;
  --danger-50: #fef2f2;
  --info: #2563eb;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .06);
  --shadow-lg: 0 12px 32px -8px rgba(16, 24, 40, .18);
  --side-w: 256px;
  /* names used by older inline styles */
  --primary-color: var(--text);
  --text-primary: var(--text);
  --text-secondary: var(--muted);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, h5 { font-weight: 700; letter-spacing: -.01em; color: var(--text); }
::selection { background: var(--brand); color: var(--ink); }

/* ───────────── App shell ───────────── */
.app-side {
  position: fixed; inset: 0 auto 0 0; width: var(--side-w); z-index: 1040;
  background: var(--ink); color: #c9ced8;
  display: flex; flex-direction: column; padding: 18px 14px;
  transition: transform .25s ease;
}
.app-brand { display: flex; align-items: center; gap: 12px; padding: 6px 8px 22px; color: #fff; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 11px; background: var(--brand);
  display: grid; place-items: center; flex: none; overflow: hidden;
}
.brand-mark img { width: 32px; height: 32px; object-fit: contain; mix-blend-mode: multiply; }
.app-brand b { display: block; font-size: 16px; line-height: 1.15; }
.app-brand small { display: block; font-size: 11.5px; color: #8b93a3; font-weight: 500; letter-spacing: .04em; text-transform: uppercase; }

.app-nav { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.app-nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: #6b7384; padding: 16px 12px 6px; font-weight: 600; }
.app-nav-link {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px;
  color: #c9ced8; font-weight: 500; font-size: 14.5px; transition: background .15s, color .15s;
}
.app-nav-link i { font-size: 18px; width: 20px; text-align: center; color: #8b93a3; transition: color .15s; }
.app-nav-link:hover { background: var(--ink-2); color: #fff; }
.app-nav-link:hover i { color: #fff; }
.app-nav-link.active { background: var(--ink-3); color: #fff; box-shadow: inset 3px 0 0 var(--brand); }
.app-nav-link.active i { color: var(--brand); }
.app-nav-link .count {
  margin-left: auto; background: var(--brand); color: var(--ink); font-size: 11.5px; font-weight: 700;
  min-width: 22px; height: 22px; border-radius: 11px; display: grid; place-items: center; padding: 0 6px;
}

.app-side-foot { border-top: 1px solid var(--ink-3); padding-top: 14px; display: flex; flex-direction: column; gap: 6px; }
.app-user { display: flex; align-items: center; gap: 10px; padding: 6px 8px; min-width: 0; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--ink-3); color: var(--brand);
  display: grid; place-items: center; font-weight: 700; flex: none;
}
.app-user b { display: block; color: #fff; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-user small { color: #8b93a3; font-size: 12px; }
.app-user > div { min-width: 0; }

.app-body { margin-left: var(--side-w); min-height: 100vh; display: flex; flex-direction: column; }
.app-top {
  position: sticky; top: 0; z-index: 1020; height: 64px; display: flex; align-items: center; gap: 12px;
  padding: 0 32px; background: rgba(244, 245, 247, .85); backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.app-burger { display: none; border: 0; background: transparent; font-size: 26px; padding: 4px; color: var(--text); }
.app-top-title { font-weight: 600; color: var(--muted); font-size: 14px; }
.app-top-title b { color: var(--text); }
.app-top-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.app-main { flex: 1; padding: 32px; width: 100%; max-width: 1320px; }
.app-foot {
  padding: 20px 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px;
  display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center;
}
.app-foot .social { margin-left: auto; display: flex; gap: 6px; }
.app-foot .social a {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  color: var(--muted); border: 1px solid var(--line); background: #fff; transition: all .15s;
}
.app-foot .social a:hover { color: var(--ink); border-color: var(--brand); background: var(--brand); }
.app-scrim { display: none; }

@media (max-width: 991px) {
  .app-side { transform: translateX(-100%); box-shadow: var(--shadow-lg); }
  .app-side.open { transform: none; }
  .app-scrim.open { display: block; position: fixed; inset: 0; background: rgba(12, 14, 19, .45); z-index: 1030; }
  .app-body { margin-left: 0; }
  .app-burger { display: block; }
  .app-top { padding: 0 16px; }
  .app-main { padding: 20px 16px; }
  .app-foot { padding: 18px 16px; }
  .app-foot .social { margin-left: 0; }
}

/* ───────────── Building blocks ───────────── */
.page-head { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 12px 20px; margin-bottom: 24px; }
.page-head h1 { font-size: 26px; margin: 0; }
.page-head p { color: var(--muted); margin: 4px 0 0; }
.page-head .actions-right { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--brand-600); }

.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.panel + .panel { margin-top: 20px; }
.panel h3 { font-size: 17px; margin: 0 0 14px; }

.ui-btn, .app-main .btn-custom, .app-main .create-course-btn, .app-main .create-user-btn, .app-main .back-btn,
.app-main .top-right-btn, .app-main .view-all-btn, .app-main .btn-enroll, .app-main .btn-continue, .app-main .btn-manage,
.app-main .play-button, .app-main .join-live-btn, .app-main .register-button, .app-main .add-video-btn .btn,
.app-main button[type=submit]:not(.status-button):not(.ui-btn-plain), .app-main .btn-primary, .app-main .video-link {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 18px; border-radius: 10px; border: 1px solid transparent;
  background: var(--brand); color: var(--ink) !important; font-weight: 600; font-size: 14.5px;
  cursor: pointer; transition: background .15s, box-shadow .15s, transform .05s; white-space: nowrap;
  text-decoration: none; width: auto; margin: 0; box-shadow: none; line-height: 1;
}
.ui-btn:hover, .app-main .btn-custom:hover, .app-main .create-course-btn:hover, .app-main .create-user-btn:hover,
.app-main .btn-enroll:hover, .app-main .play-button:hover, .app-main .register-button:hover, .app-main .add-video-btn .btn:hover,
.app-main button[type=submit]:not(.status-button):not(.ui-btn-plain):hover, .app-main .btn-primary:hover, .app-main .join-live-btn:hover,
.app-main .btn-continue:hover, .app-main .btn-manage:hover, .app-main .video-link:hover, .app-main .top-right-btn:hover {
  background: var(--brand-600); transform: none; box-shadow: none;
}
.ui-btn:active, .app-main button[type=submit]:active { transform: translateY(1px); }
.ui-btn.dark { background: var(--ink); color: #fff !important; }
.ui-btn.dark:hover { background: var(--ink-3); }
.ui-btn.ghost, .app-main .back-btn, .app-main .back-link, .app-main .view-all-btn, .app-main .cancel-button, .app-main a.btn-custom + a.btn-custom,
.app-main .video-link {
  background: #fff; border-color: var(--line); color: var(--text) !important;
}
.ui-btn.ghost:hover, .app-main .back-btn:hover, .app-main .view-all-btn:hover, .app-main .cancel-button:hover,
.app-main a.btn-custom + a.btn-custom:hover, .app-main .video-link:hover { background: var(--bg); border-color: #d1d5db; }
.ui-btn.sm, .app-main table .btn, .app-main .action-buttons .btn { height: 34px; padding: 0 12px; font-size: 13.5px; border-radius: 8px; }
.ui-btn.block { width: 100%; }
.app-main table .btn, .app-main .action-buttons .btn { display: inline-flex; align-items: center; justify-content: center; line-height: 1; }
.app-main .btn-danger, .app-main button.btn-danger, .ui-btn.danger {
  display: inline-flex; align-items: center; justify-content: center; height: 42px; padding: 0 18px;
  border-radius: 10px; font-weight: 600; background: var(--danger) !important; color: #fff !important; border: 0;
}
.app-main .btn-danger:disabled { opacity: .45; cursor: not-allowed; }
.app-main .btn:not([class*="btn-"]) {
  background: var(--ink); color: #fff; border-radius: 9px; font-weight: 600; font-size: 14px; border: 0;
  padding: 9px 16px; transition: background .15s;
}
.app-main .btn:not([class*="btn-"]):hover { background: var(--ink-3); color: #fff; }
.app-main .btn:not([class*="btn-"]):disabled { opacity: .4; }
.app-main .btn.active { background: var(--brand); color: var(--ink); }

.chip {
  display: inline-flex; align-items: center; gap: 6px; height: 26px; padding: 0 10px; border-radius: 999px;
  font-size: 12.5px; font-weight: 600; background: var(--line-2); color: var(--text); white-space: nowrap;
}
.chip.brand { background: var(--brand-50); color: #8a6400; }
.chip.ok { background: var(--ok-50); color: var(--ok); }
.chip.dark { background: var(--ink); color: #fff; }

/* Forms (also covers older pages that use plain inputs) */
.app-main label, .app-main .form-label, .app-main .register-label {
  display: block; font-weight: 600; font-size: 13.5px; color: var(--text) !important; margin-bottom: 6px;
}
.app-main input[type=text], .app-main input[type=email], .app-main input[type=url], .app-main input[type=number],
.app-main input[type=password], .app-main input[type=date], .app-main input[type=time], .app-main input[type=search],
.app-main input[type=tel], .app-main select, .app-main textarea, .app-main .form-control {
  width: 100%; height: 44px; padding: 0 14px; border: 1px solid #d6dae1; border-radius: 10px; background: #fff;
  font: inherit; font-size: 14.5px; color: var(--text); box-shadow: none; transition: border-color .15s, box-shadow .15s;
}
.app-main textarea, .app-main textarea.form-control { height: auto; min-height: 120px; padding: 12px 14px; resize: vertical; }
.app-main select { appearance: auto; }
.app-main input:focus, .app-main select:focus, .app-main textarea:focus {
  outline: 0; border-color: var(--brand-600); box-shadow: 0 0 0 4px rgba(255, 200, 21, .25);
}
.app-main input.invalid { border-color: var(--danger); }
.app-main .form-group { margin-bottom: 18px; text-align: left; }
.app-main .form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0 18px; margin: 0; }
.app-main .price-group { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.app-main .input-group { display: block; }
.app-main .text-danger { color: var(--danger) !important; font-size: 13px; }
.app-main .current-info { color: var(--muted); font-size: 12.5px; }

.app-main .form-container, .app-main .course-form, .app-main .register-card, .app-main .form-section,
.app-main .assigned-courses, .app-main .delete-section {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px; margin: 0 0 20px; max-width: none; width: auto; text-align: left;
}
.app-main .course-form, .app-main .register-card { max-width: 760px; margin: 0 auto 20px; }
.app-main .course-form h2, .app-main .register-title { font-size: 22px; margin: 0 0 22px; text-align: left; color: var(--text); }
.app-main .form-section h3, .app-main .form-section .section-title { color: var(--text) !important; font-size: 17px !important; margin: 0 0 18px; }
.app-main .file-display { font-size: 13px; color: var(--muted); margin-top: 6px; }
.app-main .file-display a, .app-main .text-primary { color: var(--info) !important; font-weight: 600; }
.app-main .delete-section { border-color: #fecaca; background: #fffafa; margin-top: 24px; }
.app-main .delete-section h4 { color: var(--danger); font-size: 16px; }
.app-main .delete-confirmation p { color: var(--muted); }
.app-main .row:has(> .form-container) { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; margin: 0; }
.app-main .row:has(> .form-container) > .form-container { margin: 0; }
.app-main .form-container h4 { font-size: 17px; }
.app-main .assigned-courses h3 { font-size: 17px; }
.app-main .assigned-courses ul, .app-main .students-table ul { padding: 0; margin: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.app-main .assigned-courses li, .app-main .students-table li {
  background: var(--line-2); border-radius: 999px; padding: 3px 10px; font-size: 12.5px; font-weight: 600;
}
.app-main hr { border-color: var(--line); opacity: 1; margin: 20px 0; }

/* Alerts / flash messages */
.app-main .alert, .flash {
  border-radius: 10px; border: 1px solid #bfdbfe; background: #eff6ff; color: #1e3a8a;
  padding: 12px 16px; margin-bottom: 18px; font-weight: 500; text-align: left;
}
.app-main .alert p { margin: 0; }
.app-main .alert-success, .flash.success { border-color: #bbf7d0; background: var(--ok-50); color: #14532d; }
.app-main .alert-error, .app-main .alert-danger, .flash.error { border-color: #fecaca; background: var(--danger-50); color: #7f1d1d; }
.app-main .alert-warning, .flash.warning { border-color: #fde68a; background: #fffbeb; color: #78350f; }

/* Headings used by older pages */
.app-main .heading-title, .app-main .page-title, .app-main .edit-course-title, .app-main .notifications-title {
  font-size: 26px !important; font-weight: 700 !important; margin: 0 0 22px !important; text-align: left !important;
  color: var(--text) !important; background: none !important; -webkit-text-fill-color: currentColor !important;
}
.app-main .heading-title::after, .app-main .page-title::after, .app-main .section-title::after { display: none !important; }
.app-main .section-title { font-size: 18px; margin: 28px 0 12px; text-align: left; color: var(--text); }
.app-main .container { max-width: none; padding: 0; margin: 0; }
.app-main .dashboard-container { padding: 0; max-width: none; }
.app-main .create-course-btn, .app-main .create-user-btn, .app-main .back-btn, .app-main .top-right-btn {
  position: static !important; margin: 0 0 20px;
}
.app-main .add-video-btn { margin-bottom: 16px; text-align: left; }
.app-main .back-link { display: inline-flex; margin-top: 12px; padding: 0 14px; height: 38px; align-items: center; border-radius: 9px; border: 1px solid var(--line); }
.app-main .edit-course-header { margin: 0; }
#edit-course-form > .btn-custom { margin-right: 8px; }

/* Tables */
.app-main table {
  width: 100%; border-collapse: separate; border-spacing: 0; background: var(--card); font-size: 14px;
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); margin: 0;
}
.app-main .card table, .app-main .table-container table { border: 0; box-shadow: none; border-radius: 0; }
.app-main thead th {
  background: #f9fafb; color: var(--muted); font-size: 12px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .05em; padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap;
}
.app-main tbody td { padding: 14px 16px; border-bottom: 1px solid var(--line-2); vertical-align: middle; text-align: left; color: var(--text); background: none; }
.app-main tbody tr:last-child td { border-bottom: 0; }
.app-main tbody tr { transition: background .12s, opacity .2s; }
.app-main tbody tr:hover td { background: #fafbfc; }
.app-main .table-container, .app-main .table-responsive {
  overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.app-main .card { border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; margin-bottom: 8px; padding: 0; }
.app-main .card .table-container { border: 0; box-shadow: none; border-radius: 0; }
.app-main .students-table { display: table; }
@media (max-width: 760px) { .app-main .students-table { display: block; overflow-x: auto; } }

.app-main .table-controls, .app-main .search-controls {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; margin-bottom: 16px;
  background: none; padding: 0; box-shadow: none; border: 0;
}
.app-main .user-name { font-weight: 600; }
.app-main .masked-password { color: var(--muted); letter-spacing: 2px; }
.app-main .user-role { display: inline-flex; gap: 6px; align-items: center; padding: 3px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.app-main .role-admin { background: var(--ink); color: #fff; }
.app-main .role-teacher { background: var(--brand-50); color: #8a6400; }
.app-main .course-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.app-main .course-tag { background: var(--line-2); padding: 3px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.app-main .no-courses { color: var(--muted); }
.app-main .actions, .app-main .action-buttons { display: flex; gap: 6px; }
.app-main .btn-edit, .app-main .btn-delete {
  display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px; border-radius: 8px;
  font-size: 13px; font-weight: 600; border: 1px solid var(--line); background: #fff; color: var(--text);
}
.app-main .btn-edit:hover { border-color: #d1d5db; background: var(--bg); }
.app-main .btn-delete { color: var(--danger); border-color: #fecaca; }
.app-main .btn-delete:hover { background: var(--danger-50); }

/* Pagination (several older styles) */
.app-main .pagination { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 16px 0 0; padding: 0; }
.app-main .pagination a, .app-main .pagination span.current, .app-main .pagination-btn, .app-main .pagination .btn, #page-numbers .btn {
  min-width: 36px; height: 36px; padding: 0 12px; border-radius: 9px; border: 1px solid var(--line); background: #fff;
  display: inline-flex; align-items: center; justify-content: center; font-weight: 600; font-size: 13.5px; color: var(--text);
}
.app-main .pagination .current, .app-main .pagination-btn.active, #page-numbers .btn.active { background: var(--ink) !important; color: #fff !important; border-color: var(--ink); }
#page-numbers { display: flex; flex-wrap: wrap; gap: 6px; }
.app-main .add-video-btn .btn { background: var(--brand); color: var(--ink) !important; padding: 0 18px; }
.app-main .add-video-btn .btn:hover { background: var(--brand-600); }
.app-main .row:has(> .form-container) { margin-bottom: 20px; }
.app-main { min-width: 0; overflow-x: hidden; }
.app-main .pagination-info { color: var(--muted); font-size: 13px; margin-left: 8px; }

.app-main .no-data, .app-main .no-notifications, .app-main .no-videos, .empty {
  text-align: center; color: var(--muted); padding: 48px 20px; background: var(--card); border: 1px dashed #d6dae1;
  border-radius: var(--radius); grid-column: 1 / -1; width: 100%;
}
.empty i { font-size: 34px; color: #c3c8d1; display: block; margin-bottom: 10px; }
.empty h3 { font-size: 17px; margin: 0 0 6px; }

/* ───────────── Stat cards (admin dashboard) ───────────── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 28px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.stat .ico { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; font-size: 20px; background: var(--brand-50); color: #8a6400; margin-bottom: 14px; }
.stat .num { font-size: 30px; font-weight: 800; line-height: 1; letter-spacing: -.02em; }
.stat .lbl { color: var(--muted); font-size: 13.5px; margin-top: 6px; font-weight: 500; }
.stat.dark { background: var(--ink); border-color: var(--ink); }
.stat.dark .num { color: #fff; }
.stat.dark .lbl { color: #9aa1ae; }
.stat.dark .ico { background: var(--brand); color: var(--ink); }
.quick { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.quick a {
  display: flex; gap: 14px; align-items: center; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; transition: border-color .15s, box-shadow .15s, transform .15s; box-shadow: var(--shadow);
}
.quick a:hover { border-color: var(--brand); box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.quick i { font-size: 20px; width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: var(--ink); color: var(--brand); flex: none; }
.quick b { display: block; font-size: 15px; }
.quick small { color: var(--muted); font-size: 13px; }

/* ───────────── Course cards ───────────── */
.course-grid, .courses-grid, .videos-grid {
  display: grid !important; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; padding: 0 !important; margin: 0 !important;
}
.app-main .course-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s, border-color .2s;
  text-align: left; color: var(--text); padding: 0; height: auto; transform: none;
}
.app-main .course-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #d9dde3; }
.app-main .course-card .thumbnail-container, .app-main .course-card > .course-thumbnail, .app-main .course-card > .no-thumbnail, .cc-thumb {
  aspect-ratio: 16 / 9; width: 100%; height: auto; background: var(--ink-2); overflow: hidden; position: relative; display: block;
}
.app-main .course-thumbnail { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: 0; margin: 0; max-height: none; }
.app-main .no-thumbnail {
  display: grid !important; place-items: center; color: #4b5263; background: linear-gradient(135deg, var(--ink-2), var(--ink-3)); width: 100%; height: 100%;
}
.app-main .course-info { padding: 18px 18px 6px; flex: 1; }
.app-main .course-card .course-title { font-size: 16.5px; font-weight: 700; line-height: 1.35; margin: 0 0 8px; color: var(--text); text-align: left; }
.app-main .course-meta { color: var(--muted); font-size: 13.5px; display: flex; gap: 6px; align-items: center; margin: 0; }
.app-main .course-meta svg { width: 16px; height: 16px; flex: none; }
.app-main .course-meta strong { font-weight: 600; color: var(--muted); }
.app-main .card-footer {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; padding: 14px 18px 18px;
  background: none; border: 0; margin-top: auto;
}
.app-main .price-tag { font-size: 18px; font-weight: 800; color: var(--text); background: none; padding: 0; margin: 0; }
.app-main .price-tag .original-price, .app-main .price-tag span[style*="line-through"] { text-decoration: line-through; color: var(--muted) !important; font-size: 13px !important; font-weight: 500; display: inline; margin-right: 6px; }
.app-main .price-tag .discounted-price, .app-main .price-tag span[style*="font-size: 1.5rem"] { font-size: 18px !important; color: var(--text) !important; }
.app-main .price-tag br { display: none; }
.app-main .card-footer .btn-enroll, .app-main .card-footer .btn-continue, .app-main .card-footer .btn-manage { height: 38px; font-size: 14px; }
.app-main .status-tag { display: inline-flex; align-items: center; height: 26px; padding: 0 10px; border-radius: 999px; background: var(--ok-50); color: var(--ok); font-size: 12.5px; font-weight: 700; margin: 0; }
.cc-progress { height: 6px; background: var(--line-2); border-radius: 3px; overflow: hidden; margin-top: 12px; }
.cc-progress > span { display: block; height: 100%; background: var(--brand); border-radius: 3px; }
.cc-badge { position: absolute; left: 12px; top: 12px; }

/* ───────────── Course detail ───────────── */
.app-main .course-header { background: none; padding: 0; margin: 0 0 22px; text-align: left; box-shadow: none; border: 0; }
.app-main .course-header .course-title, .app-main > .container > .course-header .course-title { font-size: 28px; margin: 0 0 6px; color: var(--text); text-align: left; }
.app-main .course-category { color: var(--muted); font-size: 14px; background: none; padding: 0; display: block; }
.app-main .course-info-container {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px; margin-bottom: 20px; text-align: left; display: flex; flex-direction: column; gap: 12px;
}
.app-main .course-info-container > .course-thumbnail, .app-main .course-info-container > .no-thumbnail { aspect-ratio: 16 / 9; border-radius: 10px; height: auto; }
.app-main .course-info-container .btn-custom { width: 100%; }
.app-main .course-info-container .price-tag { font-size: 26px; }
.app-main .course-description { color: #374151; line-height: 1.7; }
.app-main .course-info-container .section-title { margin: 8px 0 0; font-size: 17px; }
.app-main .course-info-container .course-video .video-link, .app-main .course-syllabus .btn-custom { width: auto; }

#pdfOverlay { display: none; position: fixed; inset: 0; z-index: 2000; background: rgba(12, 14, 19, .75); align-items: center; justify-content: center; padding: 20px; }
#pdfContainer { width: min(1000px, 100%); height: min(90vh, 900px); background: #fff; border-radius: var(--radius); overflow: hidden; position: relative; }
#pdfIframe { width: 100%; height: 100%; border: 0; }
#closePdfBtn { position: absolute; right: 12px; top: 12px; z-index: 2; height: 36px; padding: 0 14px; border: 0; border-radius: 9px; background: var(--ink); color: #fff; font-weight: 600; }

/* ───────────── Lecture list ───────────── */
.lec-head { display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center; }
.lec-progress { display: flex; align-items: center; gap: 14px; margin-top: 16px; }
.lec-progress .bar { flex: 1; height: 10px; border-radius: 5px; background: var(--line-2); overflow: hidden; }
.lec-progress .bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--brand), var(--brand-600)); border-radius: 5px; transition: width .6s ease; }
.lec-progress b { font-size: 14px; min-width: 44px; text-align: right; }
.lec-list { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.lec {
  display: flex; align-items: center; gap: 16px; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 14px 16px; transition: border-color .15s, box-shadow .15s;
}
.lec:hover { border-color: #d6dae1; box-shadow: var(--shadow); }
.lec-no {
  width: 44px; height: 44px; border-radius: 11px; flex: none; display: grid; place-items: center;
  background: var(--line-2); font-weight: 800; font-size: 15px; color: var(--text);
}
.lec.done .lec-no { background: var(--ok-50); color: var(--ok); }
.lec-title { flex: 1; min-width: 0; font-weight: 600; line-height: 1.35; }
.lec-title small { display: block; color: var(--muted); font-weight: 500; font-size: 12.5px; margin-top: 2px; }
.lec-actions { display: flex; gap: 8px; align-items: center; flex: none; }
.lec-actions form { margin: 0; }
.status-button {
  height: 38px; padding: 0 14px; border-radius: 9px; font-weight: 600; font-size: 13.5px; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--text); display: inline-flex; align-items: center; gap: 6px;
}
.status-button:hover { background: var(--bg); }
.status-button.complete { border-color: #bbf7d0; background: var(--ok-50); color: var(--ok); }
@media (max-width: 640px) {
  .lec { flex-wrap: wrap; }
  .lec-title { flex-basis: calc(100% - 60px); }
  .lec-actions { width: 100%; justify-content: flex-end; }
}
/* teacher lecture grid (older markup) */
.app-main .video-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 12px; box-shadow: var(--shadow); text-align: left; }
.app-main .video-info { display: flex; align-items: center; gap: 12px; justify-content: space-between; }
.app-main .video-number { font-weight: 800; color: var(--muted); }
.app-main .video-title { font-weight: 600; margin: 0; }

/* ───────────── Notifications ───────────── */
.app-main .notifications-container { max-width: 860px; padding: 0; margin: 0; background: none; box-shadow: none; }
.note-list { display: flex; flex-direction: column; gap: 12px; padding: 0; margin: 0; list-style: none; }
.app-main .notification, .note {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
  text-align: left; margin: 0 0 12px; border-left-width: 1px; position: relative;
}
.note { display: flex; gap: 16px; margin: 0; }
.note-ico { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; flex: none; background: var(--line-2); font-size: 19px; }
.note.live .note-ico { background: #fee2e2; color: var(--danger); }
.note-body { flex: 1; min-width: 0; }
.note-body h4 { font-size: 15.5px; margin: 0 0 4px; }
.note-body p { margin: 0 0 6px; color: #374151; }
.note-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; color: var(--muted); font-size: 13px; margin-top: 8px; }
.note-meta i { margin-right: 4px; }
.note .join { margin-top: 12px; }
.app-main .notification-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.app-main .timestamp { color: var(--muted); font-size: 12.5px; }

/* ───────────── Video player page ───────────── */
.player-body { background: #000; margin: 0; overflow: hidden; }
.player-body .iframe-container { position: fixed; inset: 0; width: 100vw; height: 100vh; }
.player-body .iframe { width: 100%; height: 100%; border: 0; display: block; }
.player-body .watermark { position: absolute; font-size: 15px; font-weight: 700; color: rgba(255, 255, 255, .45); z-index: 4; pointer-events: none; line-height: 1.3; }
.player-body .back-button {
  position: absolute; top: 14px; left: 14px; right: auto; z-index: 5; display: inline-flex; align-items: center; gap: 8px;
  height: 40px; padding: 0 16px; border-radius: 999px; border: 0; background: rgba(12, 14, 19, .75); color: #fff;
  font: 600 14px "Plus Jakarta Sans", system-ui, sans-serif; cursor: pointer; backdrop-filter: blur(6px);
}
.player-body .back-button:hover { background: var(--brand); color: var(--ink); }
.player-body .player-title {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%); z-index: 5; max-width: 60vw;
  color: #fff; background: rgba(12, 14, 19, .6); padding: 9px 16px; border-radius: 999px; font: 600 13.5px "Plus Jakarta Sans", system-ui, sans-serif;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; pointer-events: none;
}
@media (max-width: 640px) { .player-body .player-title { display: none; } }
#mobile-alert { display: none; }

/* ───────────── Sign-in pages ───────────── */
.auth { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); background: #fff; }
.auth-art {
  position: relative; overflow: hidden; background: var(--ink); color: #fff; padding: 48px 56px;
  display: flex; flex-direction: column;
}
.auth-art::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(600px 380px at 85% 10%, rgba(255, 200, 21, .22), transparent 60%),
    radial-gradient(500px 400px at 0% 100%, rgba(255, 200, 21, .12), transparent 60%);
}
.auth-art svg.circuit { position: absolute; right: -60px; bottom: -40px; width: 620px; opacity: .16; }
.auth-art > * { position: relative; }
.auth-logo { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 19px; }
.auth-logo .brand-mark { width: 44px; height: 44px; }
.auth-pitch { margin: auto 0; max-width: 520px; padding: 40px 0; }
.auth-pitch .eyebrow { color: var(--brand); }
.auth-pitch h1 { color: #fff; font-size: clamp(30px, 3.4vw, 46px); line-height: 1.1; font-weight: 800; letter-spacing: -.025em; margin: 14px 0 18px; }
.auth-pitch h1 span { color: var(--brand); }
.auth-pitch p { color: #aab1bf; font-size: 16.5px; line-height: 1.6; margin: 0 0 28px; }
.auth-points { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.auth-points li { display: flex; gap: 12px; align-items: center; color: #dfe3ea; font-weight: 500; }
.auth-points i { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; background: rgba(255, 200, 21, .14); color: var(--brand); flex: none; }
.auth-foot { color: #6b7384; font-size: 13px; }

.auth-panel { display: flex; align-items: center; justify-content: center; padding: 40px 24px; }
.auth-card { width: 100%; max-width: 420px; }
.auth-card .mobile-logo { display: none; }
.auth-card h2 { font-size: 28px; font-weight: 800; margin: 0 0 6px; letter-spacing: -.02em; }
.auth-card .sub { color: var(--muted); margin: 0 0 28px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; font-size: 13.5px; margin-bottom: 6px; }
.field .control { position: relative; }
.field .control > i { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: #9ca3af; font-size: 17px; pointer-events: none; }
.field input {
  width: 100%; height: 48px; border: 1px solid #d6dae1; border-radius: 11px; padding: 0 44px 0 42px;
  font: inherit; font-size: 15px; color: var(--text); background: #fff; transition: border-color .15s, box-shadow .15s;
}
.field input:focus { outline: 0; border-color: var(--brand-600); box-shadow: 0 0 0 4px rgba(255, 200, 21, .25); }
.field .eye { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); border: 0; background: transparent; color: #6b7280; width: 38px; height: 38px; border-radius: 8px; font-size: 18px; cursor: pointer; }
.field .eye:hover { background: var(--bg); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.auth-row { display: flex; justify-content: space-between; align-items: center; margin: -4px 0 22px; font-size: 14px; }
.auth-row a, .auth-alt a { color: var(--text); font-weight: 700; text-decoration: underline; text-decoration-color: var(--brand); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.auth-submit {
  width: 100%; height: 50px; border: 0; border-radius: 11px; background: var(--ink); color: #fff; font: inherit;
  font-weight: 700; font-size: 15.5px; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 10px; transition: background .15s;
}
.auth-submit:hover { background: var(--ink-3); }
.auth-submit i { color: var(--brand); }
.auth-alt { text-align: center; color: var(--muted); margin-top: 22px; font-size: 14.5px; }
.auth-card .flash { margin-bottom: 18px; }
@media (max-width: 900px) {
  .auth { grid-template-columns: 1fr; }
  .auth-art { display: none; }
  .auth-panel { align-items: flex-start; padding-top: 48px; }
  .auth-card .mobile-logo { display: flex; margin-bottom: 32px; color: var(--text); }
}
@media (max-width: 420px) { .field-row { grid-template-columns: 1fr; } }