/* ==========================================================================
   Landing, auth, dashboard and report pages
   ========================================================================== */

/* ---------------------------------------------------------------- nav */

.nav { position: sticky; top: 0; z-index: 30; padding: 14px 0; transition: padding 0.25s; }
.nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 64px;
  padding: 0 12px 0 18px;
  border-radius: 20px;
  border: 1px solid transparent;
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}
[dir='rtl'] .nav-inner { padding: 0 18px 0 12px; }
.nav.scrolled .nav-inner, .nav.solid .nav-inner {
  background: var(--glass-strong);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.nav-links { display: flex; gap: 2px; }
.nav-links a { color: var(--text-2); font-weight: 600; padding: 8px 14px; border-radius: 10px; }
.nav-links a:hover { color: var(--text); background: var(--surface-2); }

.user-chip { display: flex; align-items: center; gap: 10px; padding: 4px 4px 4px 4px; padding-inline-start: 4px; padding-inline-end: 6px; border: 1px solid var(--border); background: var(--surface); border-radius: 99px; }
.user-chip .avatar { width: 32px; height: 32px; font-size: 12.5px; }
.user-chip strong { font-size: 14px; font-weight: 700; }

/* ---------------------------------------------------------------- shared bits (student page) */

.join-box { display: flex; gap: 8px; margin-top: 26px; padding: 7px; border-radius: 18px; max-width: 480px; }
.join-box .input { border: 0; box-shadow: none; height: 44px; background: transparent; }

.footer { padding: 36px 0; color: var(--text-3); font-size: 14px; border-top: 1px solid var(--border); margin-top: 96px; }
.footer .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }

/* ---------------------------------------------------------------- dashboard */

.page { padding: 28px 0 72px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 28px; }
.page-head h1 { font-size: 32px; font-weight: 900; }
.page-head p { color: var(--text-2); margin-top: 4px; }
.page-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.breadcrumb { display: flex; align-items: center; gap: 6px; color: var(--text-3); font-size: 14px; margin-bottom: 10px; }
.breadcrumb a { color: var(--text-2); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 34px; }
.stat { padding: 20px; display: flex; gap: 14px; align-items: center; overflow: hidden; }
.stat-icon { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; flex-shrink: 0; color: var(--p-pale); background: rgb(var(--p) / 0.16); border: 1px solid rgb(var(--p-light) / 0.28); }
.stat-icon.green { color: #6ee7b7; background: rgb(52 211 153 / 0.14); border-color: rgb(52 211 153 / 0.28); }
.stat-icon.amber { color: #fcd34d; background: rgb(251 191 36 / 0.14); border-color: rgb(251 191 36 / 0.28); }
.stat-icon.red { color: #fda4af; background: rgb(244 63 94 / 0.14); border-color: rgb(244 63 94 / 0.28); }
.stat b { display: block; font-size: 26px; line-height: 1.2; font-weight: 900; font-variant-numeric: tabular-nums; }
.stat span { color: var(--text-2); font-size: 13.5px; }

.section-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 8px 0 16px; }
.section-title h2 { font-size: 19px; }

.class-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 18px; }
.class-card { display: flex; flex-direction: column; padding: 22px; gap: 16px; transition: transform 0.25s var(--ease), border-color 0.25s, box-shadow 0.25s; }
.class-card:hover { transform: translateY(-3px); border-color: var(--ov-4); box-shadow: var(--shadow); }
.class-card.live { border-color: rgb(244 63 94 / 0.45); box-shadow: 0 0 40px -14px rgb(244 63 94 / 0.7); }
.class-card-head { display: flex; align-items: flex-start; gap: 14px; }
.class-icon { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; color: #fff; flex-shrink: 0; box-shadow: inset 0 0 0 1px var(--ov-4), 0 8px 20px -8px rgb(0 0 0 / 0.6); }
.class-card h3 { font-size: 17px; margin-bottom: 2px; }
.class-card .desc { color: var(--text-2); font-size: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.class-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; color: var(--text-2); font-size: 13.5px; }
.class-meta span { display: inline-flex; align-items: center; gap: 6px; }
.class-actions { display: flex; gap: 8px; margin-top: auto; padding-top: 4px; }
.class-actions .btn-primary { flex: 1; }
.code-pill { display: inline-flex; align-items: center; gap: 6px; padding: 2px 10px; border-radius: 8px; background: var(--inset); border: 1px solid var(--border); font-family: ui-monospace, monospace; font-size: 12.5px; color: var(--cyan-2); direction: ltr; }

/* report */
.report-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; align-items: start; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 22px; border-bottom: 1px solid var(--border); }
.card-head h2 { font-size: 16.5px; display: flex; align-items: center; gap: 8px; }
.card-head h2 .icon { color: var(--violet-2); }
.duration-bar { height: 6px; border-radius: 99px; background: var(--ov-2); overflow: hidden; min-width: 80px; }
.duration-bar i { display: block; height: 100%; border-radius: inherit; background: var(--grad); }
.poll-result { padding: 18px 22px; border-bottom: 1px solid var(--border); }
.poll-result:last-child { border-bottom: 0; }
.poll-result h3 { font-size: 15px; margin-bottom: 12px; }
.poll-option { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; margin-bottom: 10px; font-size: 14px; }
.poll-option .bar { grid-column: 1 / -1; height: 7px; border-radius: 99px; background: var(--ov-2); overflow: hidden; }
.poll-option .bar i { display: block; height: 100%; background: linear-gradient(90deg, rgb(var(--a) / 0.75), rgb(var(--a-light) / 0.75)); border-radius: inherit; }
.poll-option.correct .bar i { background: linear-gradient(90deg, #10b981, #34d399); }
.poll-option.correct span:first-child { color: var(--success); font-weight: 700; }
.recording-item { padding: 16px 22px; border-bottom: 1px solid var(--border); display: flex; flex-direction: column; gap: 12px; }
.recording-item:last-child { border-bottom: 0; }
.recording-item video { width: 100%; border-radius: var(--radius); background: #000; aspect-ratio: 16 / 9; border: 1px solid var(--border); }

.session-row { cursor: pointer; }
.student-row { display: flex; align-items: center; gap: 12px; padding: 12px 20px; border-bottom: 1px solid var(--border); cursor: pointer; transition: background 0.15s; }
.student-row:last-child { border-bottom: 0; }
.student-row:hover { background: var(--ov-1); }
.alerts-card { margin-bottom: 28px; border-color: rgb(251 191 36 / 0.35); }
.alerts-card .card-head h2 .icon { color: var(--warning); }
.alert-row { display: flex; align-items: center; gap: 10px; padding: 10px 20px; border-bottom: 1px solid var(--border); font-size: 14px; }
.alert-row:last-child { border-bottom: 0; }
.chat-log { max-height: 420px; overflow-y: auto; padding: 8px 14px; display: flex; flex-direction: column; gap: 4px; }
.chat-log-item { padding: 8px 10px; border-radius: 12px; }
.chat-log-item.teacher { background: rgb(var(--p) / 0.1); }
.chat-log-item p { white-space: pre-wrap; word-break: break-word; font-size: 14px; color: var(--text-2); }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 1020px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .report-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav { padding: 8px 0; }
  .nav-links { display: none; }
  .nav-inner .btn-ghost { display: none; }
  .page-head h1 { font-size: 25px; }
  .stats { gap: 10px; }
  .stat { padding: 14px; }
  .toasts, .toasts[popover] { inset-inline: 16px; bottom: 16px; }
}

/* ---------------------------------------------------------------- homework */
.hw-page { max-width: 860px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hw-identity { padding: 20px; margin-bottom: 18px; display: grid; gap: 8px; }
.hw-list { display: grid; gap: 16px; }
.hw-card { padding: 22px; display: grid; gap: 14px; min-width: 0; }
.hw-card > * { min-width: 0; }
.hw-form .row { flex-wrap: wrap; }
.hw-card .badge { white-space: normal; }
.hw-head { display: flex; gap: 14px; align-items: flex-start; }
.hw-head h3 { font-size: 18px; margin-bottom: 6px; }
.hw-body { white-space: pre-wrap; color: var(--text-2); margin: 0; }
.hw-form { display: grid; gap: 10px; }
.hw-files { display: flex; flex-wrap: wrap; gap: 6px; }
.hw-files:empty { display: none; }
.hw-status { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-radius: 14px; background: rgb(var(--p) / 0.1); border: 1px solid rgb(var(--p) / 0.3); color: rgb(var(--p-light)); font-weight: 700; }
.hw-status.graded { color: var(--text); }
.hw-status p { margin: 2px 0 0; color: var(--text-2); font-weight: 500; white-space: pre-wrap; }
.hw-score { font-size: 22px; font-weight: 900; padding: 6px 14px; border-radius: 12px; background: var(--grad); color: #fff; white-space: nowrap; direction: ltr; }
.hw-submitted { display: grid; gap: 6px; padding: 12px 14px; border-radius: 14px; border: 1px dashed var(--border-strong); }
.sub-row { display: grid; gap: 10px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.sub-row:last-child { border-bottom: 0; }
.sub-row .grade-form { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.sub-row .grade-form .input { width: auto; }
.sub-thumbs { display: flex; gap: 8px; flex-wrap: wrap; }
.sub-thumbs img { width: 96px; height: 96px; object-fit: cover; border-radius: 10px; border: 1px solid var(--border); }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- legal */
.legal { max-width: 820px; padding: 40px clamp(20px, 5vw, 56px); line-height: 1.95; }
.legal h1 { font-size: 32px; font-weight: 900; margin-bottom: 4px; }
.legal h2 { font-size: 20px; margin: 30px 0 8px; }
.legal p, .legal li { color: var(--text-2); font-size: 15.5px; }
.legal ul { padding-inline-start: 22px; display: grid; gap: 6px; }
.legal b { color: var(--text); }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--text-2); }

/* ---------------------------------------------------------------- admin */
.admin-stats { grid-template-columns: repeat(4, 1fr); }
.admin-users-head { flex-wrap: wrap; gap: 10px; }
.user-row.suspended td { opacity: 0.55; }
.bar-chart { padding: 18px 22px 16px; position: relative; }
.bar-chart .chart-empty { position: absolute; inset: 0; display: grid; place-items: center; color: var(--text-2); font-size: 14px; }
#live-list > p { padding: 14px 22px !important; margin: 0; }
.admin-stats .stat b { white-space: nowrap; }
.bar-chart .bars { height: 170px; display: flex; align-items: flex-end; gap: 2px; border-bottom: 1px solid var(--border); }
.bar-col { flex: 1; height: 100%; display: flex; align-items: flex-end; position: relative; cursor: default; outline: none; }
.bar-col i { display: block; width: 100%; background: rgb(var(--p)); border-radius: 4px 4px 0 0; transition: opacity 0.15s; }
.bar-col:hover i, .bar-col:focus i { opacity: 0.8; }
.bar-col[data-tip]:hover::after, .bar-col[data-tip]:focus::after { content: attr(data-tip); position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%); white-space: nowrap; padding: 6px 10px; border-radius: 10px; background: var(--glass-strong); border: 1px solid var(--border); color: var(--text); font-size: 12.5px; z-index: 5; pointer-events: none; }
.bar-col:hover, .bar-col:focus { background: var(--ov-1); border-radius: 6px 6px 0 0; }
.bar-axis { display: flex; justify-content: space-between; color: var(--text-3, var(--text-2)); font-size: 12px; padding-top: 6px; }
@media (max-width: 1020px) { .admin-stats { grid-template-columns: 1fr 1fr; } }

/* --------------------------------------------------- dashboard (Zoom-style home) */
.quick-actions { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 18px; }
.quick-action { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; padding: 22px; border-radius: var(--radius-lg, 22px); border: 1px solid var(--border); background: var(--glass); color: var(--text); font: inherit; text-align: start; cursor: pointer; transition: transform 0.2s var(--ease), border-color 0.2s, box-shadow 0.2s; backdrop-filter: blur(16px); }
.quick-action:hover { transform: translateY(-3px); border-color: rgb(var(--p) / 0.5); box-shadow: var(--shadow); }
.quick-action .qa-icon { width: 56px; height: 56px; border-radius: 16px; display: grid; place-items: center; margin-bottom: 10px; background: rgb(var(--p) / 0.14); color: rgb(var(--p-light)); }
.quick-action b { font-size: 18px; font-weight: 800; }
.quick-action small { color: var(--text-2); font-size: 13.5px; }
.quick-action.primary { background: var(--grad); border-color: transparent; color: #fff; box-shadow: 0 18px 40px -18px rgb(var(--p-deep) / 0.9); }
.quick-action.primary .qa-icon { background: rgb(255 255 255 / 0.2); color: #fff; }
.quick-action.primary small { color: rgb(255 255 255 / 0.85); }
.personal-room { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 18px 22px; margin-bottom: 24px; }
.personal-room.live { border-color: rgb(244 63 94 / 0.45); }
.pr-info { display: grid; gap: 4px; min-width: 0; }
.pr-link { font-weight: 800; font-size: 17px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pr-actions { display: flex; gap: 8px; align-items: center; }
.more-options summary { cursor: pointer; font-weight: 700; color: var(--text-2); }
.more-options summary:hover { color: var(--text); }
@media (max-width: 1020px) { .quick-actions { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) {
  .quick-action { padding: 16px; }
  .quick-action .qa-icon { width: 46px; height: 46px; }
  .quick-action b { font-size: 16px; }
  .pr-actions { width: 100%; }
  .user-chip strong { display: none; }
  .pr-actions .btn { flex: 1; }
}

/* --------------------------------------------------- account settings */
.account-section h3 { font-size: 16px; }
.account-section + .account-section { padding-top: 18px; border-top: 1px solid var(--border); }
.danger-zone h3 { color: #fda4af; }
:root[data-theme='light'] .danger-zone h3 { color: #be123c; }
@media (max-width: 640px) { .account-btn .label { display: none; } }

/* --------------------------------------------------- load errors / busy */
.load-error { gap: 12px; }
.quick-action[aria-busy='true'] { cursor: progress; opacity: 0.85; }
.upload-progress { display: grid; gap: 6px; font-size: 13px; color: var(--text-2); }
.upload-progress .duration-bar { height: 6px; }

/* ---------------------------------------------------------------- platform announcement */
.announcement { display: flex; align-items: center; gap: 10px; margin: 12px 0; padding: 10px 14px; border-radius: 14px; border: 1px solid rgb(var(--p-light) / 0.35); background: rgb(var(--p) / 0.12); color: var(--text); }
.announcement > .icon { color: rgb(var(--p-light)); flex-shrink: 0; }
:root[data-theme='light'] .announcement > .icon { color: #047857; }
.announcement p { flex: 1; min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.dash .announcement { margin: 14px 28px 0; }
@media (max-width: 899px) { .dash .announcement { margin: 12px 16px 0; } }

/* three stat cards (version 1 student page) fill the row */
@media (min-width: 1021px) {
  .stats:not(:has(> :nth-child(4))) { grid-template-columns: repeat(3, 1fr); }
}