:root {
  --bg: #0f1117;
  --panel: #181b24;
  --panel-2: #1f2330;
  --border: #2a2f3d;
  --text: #e6e8ee;
  --muted: #8b92a5;
  --accent: #ffa116;      /* LeetCode orange */
  --easy: #00b8a3;
  --medium: #ffb800;
  --hard: #ff375f;
  --green: #2cbb5d;
}
/* Light theme — overrides only the surfaces/text; accent + status colors stay. */
:root[data-theme="light"] {
  --bg: #f4f5f8;
  --panel: #ffffff;
  --panel-2: #eceef2;
  --border: #d9dde4;
  --text: #0c1017;   /* darker main text for stronger contrast on white */
  --muted: #3c4350;  /* darker muted/secondary text */
  --medium: #9a6d00; /* darker amber for contrast on white */
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); }

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px; background: var(--panel); border-bottom: 1px solid var(--border);
  flex-wrap: wrap; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 28px; }
.brand h1 { font-size: 18px; margin: 0; }
.sub { margin: 0; color: var(--muted); font-size: 12px; }
.college-picker { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.college-picker label { color: var(--muted); font-size: 13px; }
.college-picker select {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 10px; min-width: 200px;
}
.sync-status { font-size: 12px; color: var(--muted); }

.tabs { display: flex; gap: 4px; padding: 0 24px; background: var(--panel); border-bottom: 1px solid var(--border); }
.tab {
  background: none; border: none; color: var(--muted); padding: 12px 18px;
  cursor: pointer; font-size: 14px; border-bottom: 2px solid transparent;
}
.tab.active { color: var(--text); border-bottom-color: var(--accent); }

main { padding: 24px; max-width: 1200px; margin: 0 auto; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-bottom: 20px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.card .v { font-size: 26px; font-weight: 700; }
.card .l { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.card.easy .v { color: var(--easy); }
.card.medium .v { color: var(--medium); }
.card.hard .v { color: var(--hard); }

.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 18px; margin-bottom: 20px; }
.panel.narrow { max-width: 520px; }
.panel h2 { font-size: 15px; margin: 0 0 12px; }
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.panel-head h2 { margin: 0; }
.hint { color: var(--muted); font-size: 13px; line-height: 1.5; }
.hint code { background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
tbody tr:hover { background: var(--panel-2); cursor: pointer; }
.pill { padding: 2px 8px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.pill.easy { background: rgba(0,184,163,.15); color: var(--easy); }
.pill.medium { background: rgba(255,184,0,.15); color: var(--medium); }
.pill.hard { background: rgba(255,55,95,.15); color: var(--hard); }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.dot.ok { background: var(--green); }
.dot.error { background: var(--hard); }
.dot.pending { background: var(--muted); }

.progress { background: var(--panel-2); border-radius: 20px; height: 8px; width: 120px; overflow: hidden; display: inline-block; vertical-align: middle; }
.progress > span { display: block; height: 100%; background: var(--green); }

.btn { border: 1px solid var(--border); background: var(--panel-2); color: var(--text); border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 14px; }
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); color: #1a1300; border-color: var(--accent); font-weight: 600; }
.btn-ghost { background: transparent; }
.btn-danger { color: var(--hard); border-color: transparent; background: transparent; }
.btn-sm { padding: 4px 9px; font-size: 12px; }
.row { display: flex; gap: 10px; align-items: center; margin-top: 12px; flex-wrap: wrap; }
.file-btn { display: inline-flex; align-items: center; }

textarea, .search, .field input {
  width: 100%; background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 10px; font-size: 14px; font-family: inherit;
}
.search { width: 240px; }
.filter-sel { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 13px; }
.dom-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.dom-tab { background: var(--panel-2); color: var(--muted); border: 1px solid var(--border); border-radius: 20px; padding: 6px 14px; font-size: 13px; cursor: pointer; }
.dom-tab.active { background: var(--accent); color: #1a1300; border-color: var(--accent); font-weight: 600; }
.reorder-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .reorder-cols { grid-template-columns: 1fr; } }
.reorder-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 8px; }
.sortlist { display: flex; flex-direction: column; gap: 6px; min-height: 20px; }
.sort-item { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; font-size: 13px; cursor: grab; user-select: none; }
.sort-item:active { cursor: grabbing; }
.sortable-ghost { opacity: .4; }

.combo-pop { position: fixed; z-index: 500; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; max-height: 220px; overflow-y: auto; box-shadow: 0 8px 24px rgba(0,0,0,.35); }
.combo-item { padding: 8px 12px; font-size: 13px; cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.combo-item:hover, .combo-item.active { background: var(--panel-2); }
.combo-empty { padding: 8px 12px; font-size: 12px; color: var(--muted); }
.field { display: block; margin-bottom: 14px; }
.field span { display: block; color: var(--muted); font-size: 13px; margin-bottom: 5px; }
.msg { font-size: 13px; margin-top: 10px; white-space: pre-line; }
.msg.err { color: var(--hard); }
.msg.ok { color: var(--green); }

.empty { color: var(--muted); padding: 24px; text-align: center; }

/* drawer */
.drawer { position: fixed; top: 0; right: -520px; width: 500px; max-width: 92vw; height: 100%; background: var(--panel); border-left: 1px solid var(--border); transition: right .22s ease; z-index: 50; overflow-y: auto; }
.drawer.open { right: 0; }
.drawer-inner { padding: 22px; }
.drawer-close { position: absolute; top: 14px; right: 16px; background: none; border: none; color: var(--muted); font-size: 18px; cursor: pointer; }
.backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.5); opacity: 0; pointer-events: none; transition: opacity .22s; z-index: 40; }
.backdrop.show { opacity: 1; pointer-events: auto; }

.admin-login { position: fixed; inset: 0; z-index: 300; background: var(--bg); display: none; align-items: center; justify-content: center; }
.admin-login.show { display: flex; }
.admin-login-box { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 28px 30px; width: 340px; max-width: 92vw; }

.foot { text-align: center; color: var(--muted); font-size: 12px; padding: 18px; }
.kv { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; margin: 14px 0; }
.kv .l { color: var(--muted); font-size: 12px; }
.kv .v { font-size: 18px; font-weight: 700; }
.check { color: var(--green); } .cross { color: var(--muted); }
.delta { font-size: 11px; font-weight: 700; color: var(--green); white-space: nowrap; }
.delta.down { color: var(--hard); }

/* ---- Student dashboard (prettier) ---------------------------------------- */
@keyframes stuEnter {
  from { opacity: 0; transform: translateY(24px) scale(.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.stu-anim { animation: stuEnter .6s cubic-bezier(.34, 1.56, .64, 1) both; } /* bouncy overshoot */

.stu-hero {
  display: flex; align-items: center; gap: 18px;
  background: linear-gradient(135deg, rgba(255,161,22,.20), rgba(44,187,93,.12));
  border: 1px solid var(--border); border-radius: 18px; padding: 22px 24px; margin-bottom: 18px;
}
.stu-avatar {
  width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center;
  font-size: 26px; font-weight: 800; color: #1a1300; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--accent), #ffd27d);
  box-shadow: 0 6px 18px rgba(255,161,22,.35);
}
.stu-hero-info h2 { margin: 0; font-size: 22px; }
.stu-hero-sub { color: var(--muted); font-size: 13px; margin-top: 4px; }
.stu-hero-tags { margin-top: 9px; display: flex; gap: 6px; flex-wrap: wrap; }
.stu-rankbadge { margin-left: auto; text-align: center; background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 12px 20px; }
.stu-rankbadge .n { font-size: 26px; font-weight: 800; color: var(--accent); }
.stu-rankbadge .l { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }

.stu-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 14px; margin-bottom: 18px; }
@media (max-width: 760px) { .stu-grid { grid-template-columns: 1fr; } }
.stu-tile { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 18px 20px; }
.stu-tile-label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.stu-total { font-size: 46px; font-weight: 800; line-height: 1.05; margin-top: 4px; }
.stu-tile .big { font-size: 30px; font-weight: 800; margin-top: 8px; }
.stu-bar { display: flex; height: 12px; border-radius: 7px; overflow: hidden; margin-top: 16px; background: var(--panel-2); }
.stu-bar > span { display: block; height: 100%; }
.stu-legend { display: flex; gap: 16px; margin-top: 10px; font-size: 12px; color: var(--muted); flex-wrap: wrap; }
.stu-legend i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 6px; vertical-align: middle; }

.stu-panel { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 20px 22px; margin-bottom: 18px; }
.stu-panel h3 { margin: 0 0 14px; font-size: 14px; }

.stu-chips { display: flex; gap: 12px; flex-wrap: wrap; }
.stu-chip { background: var(--panel-2); border-radius: 12px; padding: 12px 16px; min-width: 96px; }
.stu-chip .l { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.stu-chip .v { font-size: 18px; font-weight: 700; margin-top: 3px; }

/* progress metric cards + per-month bars */
.pg-cards { display: flex; gap: 12px; flex-wrap: wrap; }
.pg-card { flex: 1; min-width: 116px; background: var(--panel-2); border-radius: 14px; padding: 14px 16px; }
.pg-card .l { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.pg-card .v { font-size: 24px; font-weight: 800; margin-top: 4px; color: var(--c, var(--text)); }
.pg-card .chg { display: inline-block; margin-top: 9px; font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 20px; }
.pg-card .chg.up { background: rgba(44,187,93,.18); color: var(--green); }
.pg-card .chg.down { background: rgba(255,55,95,.18); color: var(--hard); }
.pg-card .chg.flat { background: var(--panel); color: var(--muted); }
.pm-legend { display: flex; gap: 16px; font-size: 12px; color: var(--muted); margin-bottom: 10px; }
.pm-legend i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 5px; vertical-align: middle; }
.pm-row { display: flex; align-items: center; gap: 14px; padding: 7px 0; }
.pm-month { width: 78px; font-weight: 600; font-size: 13px; }
.pm-bar { flex: 1; display: flex; height: 14px; border-radius: 7px; overflow: hidden; background: var(--panel-2); }
.pm-bar > span { display: block; height: 100%; }
.pm-total { width: 38px; text-align: right; font-weight: 700; }

.stu-domain-head { font-weight: 700; font-size: 15px; margin: 22px 0 10px; padding-bottom: 6px; border-bottom: 2px solid var(--accent); }
.stu-domain-head:first-child { margin-top: 0; }
.stu-topic-head { display: flex; align-items: center; gap: 12px; margin: 20px 0 8px; }
.stu-topic-head:first-child { margin-top: 0; }
.stu-topic-head .name { font-weight: 700; font-size: 14px; }
.stu-topic-bar { flex: 1; height: 8px; background: var(--panel-2); border-radius: 6px; overflow: hidden; }
.stu-topic-bar > span { display: block; height: 100%; background: var(--green); border-radius: 6px; }
.stu-prac { display: flex; align-items: center; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--border); }
.stu-prac:last-child { border-bottom: none; }
.stu-badge { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-size: 14px; font-weight: 700; flex: 0 0 auto; }
.stu-badge.done { background: rgba(44,187,93,.18); color: var(--green); }
.stu-badge.todo { background: var(--panel-2); color: var(--muted); }
.stu-prac-title { flex: 1; min-width: 0; }
.stu-prac-title a { color: var(--text); text-decoration: none; font-weight: 600; }
.stu-prac-title a:hover { color: var(--accent); }

/* ---- Admin students table (prettier) ------------------------------------- */
#studentTable td { vertical-align: middle; }
#studentTable tbody tr { transition: background .12s; }
.s-cell { display: flex; align-items: center; gap: 11px; }
.s-av { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: 14px; color: #fff; flex: 0 0 auto; box-shadow: 0 2px 6px rgba(0,0,0,.25); }
.s-name { font-weight: 600; line-height: 1.2; }
.s-user { color: var(--muted); font-size: 12px; line-height: 1.4; }
.s-tags { margin-top: 3px; }
.tag { display: inline-block; background: var(--panel-2); color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 1px 7px; font-size: 11px; margin-right: 5px; }
.medal { font-size: 18px; }
.rank-num { color: var(--muted); font-weight: 700; padding-left: 4px; }
.dbar { display: flex; height: 8px; width: 130px; border-radius: 5px; overflow: hidden; background: var(--panel-2); }
.dbar > span { display: block; height: 100%; }
.dcounts { font-size: 12px; color: var(--muted); margin-top: 5px; font-weight: 600; }
.tot { font-size: 19px; font-weight: 800; }
.pp { display: flex; align-items: center; gap: 9px; }
.pp .bar { width: 76px; height: 7px; background: var(--panel-2); border-radius: 5px; overflow: hidden; }
.pp .bar > span { display: block; height: 100%; background: var(--green); border-radius: 5px; }

/* Practice completion breakdown */
.dist-list { display: flex; flex-direction: column; gap: 6px; }
.dist-row {
  display: grid; grid-template-columns: minmax(140px, 220px) 1fr auto; align-items: center; gap: 12px;
  width: 100%; text-align: left; cursor: pointer;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 12px; color: var(--text); font: inherit; transition: border-color .15s, transform .05s;
}
.dist-row:hover { border-color: var(--accent); }
.dist-row:active { transform: scale(.995); }
.dist-label { font-weight: 600; font-size: 13px; }
.dist-bar { height: 8px; background: var(--border); border-radius: 5px; overflow: hidden; }
.dist-bar > span { display: block; height: 100%; background: var(--accent); border-radius: 5px; }
.dist-num { font-variant-numeric: tabular-nums; white-space: nowrap; font-weight: 600; }
.dist-all { background: var(--accent); color: #1a1300; border-radius: 4px; padding: 0 6px; font-size: 11px; font-weight: 700; }

/* Drawer mini table (completer lists) */
.mini-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.mini-table th, .mini-table td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--border); }
.mini-table th { color: var(--muted); font-weight: 600; }
.mini-table tr[data-id]:hover td { background: var(--panel-2); }
.dist-pager { display: flex; align-items: center; justify-content: flex-end; gap: 12px; margin-top: 10px; }

/* Practice video links */
.vid-link { font-size: 12px; font-weight: 600; color: #ff4d4f; white-space: nowrap; margin-left: 6px;
  background: none; border: none; padding: 0; cursor: pointer; font-family: inherit; }
.vid-link:hover { text-decoration: underline; }
.stu-vid { color: #ff4d4f !important; border-color: rgba(255,77,79,.4) !important; }

/* Bulk add: question links + video links side by side */
.bulk-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.bulk-cols textarea { width: 100%; }
.bulk-label { display: block; font-size: 12px; color: var(--muted); font-weight: 600; margin-bottom: 5px; }
@media (max-width: 700px) { .bulk-cols { grid-template-columns: 1fr; } }

/* At-risk badge + sortable headers + DB driver badge */
.risk-badge { display:inline-block; font-size:10px; font-weight:700; color:#d4380d; background:rgba(255,77,79,.14);
  border:1px solid rgba(255,77,79,.4); border-radius:5px; padding:1px 5px; margin-left:6px; vertical-align:middle; }
#studentTable th.sortable { cursor:pointer; user-select:none; white-space:nowrap; }
#studentTable th.sortable:hover { color:var(--accent); }
#studentTable th.sortable::after { content:attr(data-arrow); margin-left:4px; color:var(--accent); font-size:11px; }
#studentTable th.sorted { color:var(--accent); }
.db-badge { font-size:11px; padding:1px 7px; border-radius:5px; margin-left:8px; border:1px solid var(--border); }
.db-badge.ok { color:var(--green); border-color:rgba(44,187,93,.4); }
.db-badge.warn { color:var(--accent); border-color:rgba(255,161,22,.4); }

/* Deadline pills */
.due-pill { display:inline-block; font-size:11px; font-weight:600; padding:1px 6px; border-radius:5px; margin-left:6px;
  background:var(--panel-2); color:var(--muted); border:1px solid var(--border); white-space:nowrap; vertical-align:middle; }
.due-pill.overdue { color:#d4380d; background:rgba(255,77,79,.14); border-color:rgba(255,77,79,.4); }
.due-pill.ontime { color:var(--green); background:rgba(44,187,93,.14); border-color:rgba(44,187,93,.4); }
.due-pill.late { color:#d4380d; background:rgba(255,77,79,.14); border-color:rgba(255,77,79,.4); }

/* Bulk action bar + leaderboard */
.bulk-bar { display:flex; align-items:center; gap:10px; margin-bottom:10px; padding:8px 12px;
  background:var(--panel-2); border:1px solid var(--border); border-radius:8px; }
#studentTable th:first-child, #studentTable td:first-child { width:28px; text-align:center; }
.lb-row { display:flex; align-items:center; gap:10px; padding:7px 0; border-bottom:1px solid var(--border); }
.lb-row:last-child { border-bottom:none; }
.lb-rank { width:26px; text-align:center; font-weight:700; }
.lb-name { flex:1; font-weight:600; }
.lb-total { font-variant-numeric:tabular-nums; font-weight:700; color:var(--accent); }

/* Inline YouTube player modal — fills the screen (as large as 16:9 allows). */
.video-modal { position:fixed; inset:0; background:rgba(0,0,0,.9); display:none; align-items:center; justify-content:center; z-index:1000; padding:0; }
.video-modal.open { display:flex; }
/* Width is capped by both viewport width and (viewport height × 16/9) so the
   16:9 video is always the biggest that fits the screen. */
.video-modal-inner { position:relative; width:min(100vw, calc(100vh * 16 / 9)); height:min(100vh, calc(100vw * 9 / 16)); }
.video-frame { position:absolute; inset:0; background:#000; overflow:hidden; }
.video-frame iframe { position:absolute; inset:0; width:100%; height:100%; border:0; }
.video-modal-close { position:absolute; top:12px; right:16px; z-index:2; background:rgba(0,0,0,.5); border:none; color:#fff; font-size:28px; cursor:pointer; line-height:1; width:44px; height:44px; border-radius:50%; }

/* Auto-refresh schedule inputs */
.ar-sched { display:inline-flex; align-items:center; gap:5px; }
.ar-time { background:var(--panel-2); color:var(--text); border:1px solid var(--border); border-radius:6px; padding:4px 6px; font-size:12px; }

/* Per-college auto-sync / auto-refresh settings row */
.cset-row td { background: var(--panel-2); border-bottom: 2px solid var(--border); }
.cset { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; padding: 4px 2px; }
.cset-grp { display: inline-flex; align-items: center; gap: 6px; }
.cset-grp select { padding: 5px 8px; font-size: 12px; }

/* Student table: fit the full width with no left-right scrolling. Cells wrap
   instead of forcing the table wider than the screen. */
#studentTable { width: 100%; }
#studentTable th, #studentTable td { white-space: normal; padding: 9px 8px; vertical-align: middle; font-size: 13px; }
/* only the name/username may break mid-word (long @handles); numbers never do */
#studentTable .s-name, #studentTable .s-user { overflow-wrap: anywhere; word-break: break-word; }
#studentTable .rank-num, #studentTable .medal, #studentTable .tot, #studentTable .dcounts { white-space: nowrap; }
#studentTable .progress { width: 100%; max-width: 90px; }
#studentTable .dbar { width: 100%; max-width: 100px; }
#studentTable .pp { flex-wrap: wrap; }
/* checkbox / rank columns: keep their number on one line, stay compact */
#studentTable td, #studentTable th { min-width: 0; }
#studentTable td:first-child, #studentTable th:first-child { width: 34px; white-space: nowrap; }

/* Drill-down drawer table: fit the drawer width, wrap instead of scrolling. */
#drawerContent { overflow-x: hidden; }
.mini-table { width: 100%; table-layout: fixed; }
.mini-table th, .mini-table td { white-space: normal; overflow-wrap: anywhere; word-break: break-word; padding: 6px 6px; font-size: 12px; }

/* All tables inside the student drawer: fit the drawer width, wrap, never clip. */
#drawerContent table { width: 100%; table-layout: fixed; }
#drawerContent th, #drawerContent td { white-space: normal; overflow-wrap: anywhere; word-break: break-word; padding: 6px 6px; font-size: 12px; }
#drawerContent .toggle-comp { white-space: nowrap; }

/* Question row actions: Video → Difficulty → Solve, aligned */
.stu-prac-actions { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.stu-prac-diff { display: inline-flex; min-width: 64px; }

/* Keep the total and its "+6" change on one line */
#studentTable .tot-td { white-space: nowrap; }

/* Rank change (▲/▼) on its own line, below the rank number */
#studentTable .rank-delta { display: block; white-space: nowrap; margin-top: 2px; }

/* Practice drawer filter bar & controls */
.drawer-filter-bar {
  display: flex; flex-direction: column; gap: 8px; margin: 12px 0 16px;
  padding: 10px 12px; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px;
}
.drawer-filter-row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.drawer-filter-search {
  flex: 1; min-width: 130px; font-size: 12px; padding: 6px 9px;
  background: var(--panel); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px;
}
.drawer-filter-sel {
  font-size: 12px; padding: 6px 8px; background: var(--panel);
  color: var(--text); border: 1px solid var(--border); border-radius: 6px;
  max-width: 140px;
}
.drawer-tabs {
  display: inline-flex; gap: 3px; background: var(--panel);
  border: 1px solid var(--border); border-radius: 6px; padding: 2px;
}
.drawer-tab {
  padding: 3px 8px; font-size: 11px; font-weight: 600; border-radius: 4px;
  border: none; background: transparent; color: var(--muted); cursor: pointer;
  transition: background .15s, color .15s;
}
.drawer-tab.active { background: var(--accent); color: #1a1300; }
.drawer-filter-meta {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 11px; color: var(--muted); margin-top: 2px;
}
.drawer-clear-btn {
  background: none; border: none; color: var(--accent); font-size: 11px;
  cursor: pointer; padding: 0; text-decoration: underline;
}
.drawer-pager {
  display: flex; align-items: center; justify-content: flex-end;
  gap: 10px; margin: 8px 0 14px; font-size: 12px;
}
.drawer-pager .hint { font-size: 11px; }

/* Problem completion stat info graph in drawer */
.prob-stat-bar {
  margin: 10px 0 14px; padding: 10px 12px;
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px;
}
.prob-stat-track {
  display: flex; height: 10px; width: 100%;
  background: var(--border); border-radius: 6px; overflow: hidden;
  margin-bottom: 6px;
}
.prob-stat-fill.comp {
  background: var(--green); height: 100%; transition: width .3s ease;
}
.prob-stat-fill.notcomp {
  background: rgba(255, 77, 79, 0.45); height: 100%; transition: width .3s ease;
}
.prob-stat-labels {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 11px; font-weight: 600;
}

/* ==========================================================================
   Shadcn UI Data Table System
   ========================================================================== */

/* Card & Table container */
.shad-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.25);
  margin-top: 16px;
}

.shad-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  gap: 14px;
  flex-wrap: wrap;
  background: var(--panel);
}

.shad-toolbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  flex: 1;
}

.shad-toolbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Shadcn Search Input */
.shad-search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 220px;
}
.shad-search-wrap svg {
  position: absolute;
  left: 10px;
  color: var(--muted);
  pointer-events: none;
}
.shad-search-wrap input {
  width: 100%;
  height: 32px;
  padding: 0 10px 0 30px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 12px;
  transition: border-color .15s, box-shadow .15s;
}
.shad-search-wrap input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(255, 161, 22, 0.2);
}

/* Shadcn Buttons */
.shad-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  height: 32px;
  padding: 0 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
  text-decoration: none;
  border: 1px solid transparent;
}
.shad-btn svg { flex-shrink: 0; }

.shad-btn-primary {
  background: var(--accent);
  color: #1a1300;
  font-weight: 600;
}
.shad-btn-primary:hover {
  filter: brightness(1.08);
}

.shad-btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.shad-btn-outline:hover {
  background: var(--panel-2);
  border-color: var(--muted);
}

.shad-btn-outline-sm {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
  height: 26px;
  padding: 0 8px;
  font-size: 11px;
}
.shad-btn-outline-sm:hover {
  background: var(--panel-2);
  border-color: var(--muted);
}

.shad-btn-ghost {
  background: transparent;
  color: var(--text);
}
.shad-btn-ghost:hover {
  background: var(--panel-2);
}

.shad-btn-ghost-sm {
  background: transparent;
  color: var(--text);
  height: 26px;
  padding: 0 8px;
  font-size: 11px;
}
.shad-btn-ghost-sm:hover {
  background: var(--panel-2);
}

.shad-btn-icon {
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all .15s;
}
.shad-btn-icon:hover {
  background: var(--panel-2);
  color: var(--text);
  border-color: var(--border);
}

/* Shadcn Select */
.shad-select {
  height: 32px;
  padding: 0 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 12px;
  cursor: pointer;
}
.shad-select-sm {
  height: 24px;
  padding: 0 6px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-size: 11px;
  cursor: pointer;
}
.shad-select:focus, .shad-select-sm:focus {
  outline: none;
  border-color: var(--accent);
}

/* Shadcn Badges */
.shad-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 7px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
}
.shad-badge-code {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 161, 22, 0.08);
  border: 1px solid rgba(255, 161, 22, 0.28);
  color: var(--accent);
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
  transition: all .15s;
}
.shad-badge-code:hover {
  background: rgba(255, 161, 22, 0.16);
  border-color: rgba(255, 161, 22, 0.45);
}
.shad-badge-code code {
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
}
.shad-badge-code .copy-icon {
  opacity: 0.7;
}

/* Shadcn Table */
.shad-table-wrap {
  width: 100%;
  overflow-x: auto;
}
#collegeTable {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
#collegeTable thead th {
  background: rgba(255, 255, 255, 0.015);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
#collegeTable tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background-color .15s ease;
}
#collegeTable tbody tr:last-child {
  border-bottom: none;
}
#collegeTable tbody tr:hover {
  background: rgba(255, 255, 255, 0.025);
}
#collegeTable tbody td {
  padding: 13px 18px;
  vertical-align: middle;
  font-size: 13px;
  white-space: nowrap;
}

/* Action Dropdown Menu (Shadcn Popover) */
.shad-dropdown-menu {
  position: fixed;
  z-index: 1000;
  min-width: 190px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  padding: 4px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  animation: shadScaleIn .12s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes shadScaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
.shad-dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  border-radius: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: background .12s, color .12s;
}
.shad-dropdown-item svg {
  flex-shrink: 0;
  color: var(--muted);
}
.shad-dropdown-item:hover {
  background: var(--panel-2);
}
.shad-dropdown-item.destructive {
  color: #ff4d4f;
}
.shad-dropdown-item.destructive svg {
  color: #ff4d4f;
}
.shad-dropdown-item.destructive:hover {
  background: rgba(255, 77, 79, 0.12);
}
.shad-dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 3px 0;
}

/* Shadcn Modal Dialog */
.shad-dialog-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
}
.shad-dialog-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}
.shad-dialog {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 90%;
  max-width: 440px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  transform: scale(0.95);
  transition: transform .2s ease;
}
.shad-dialog-backdrop.open .shad-dialog {
  transform: scale(1);
}
.shad-dialog-header {
  padding: 18px 20px 12px;
  border-bottom: 1px solid var(--border);
}
.shad-dialog-header h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
}
.shad-dialog-header p {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}
.shad-dialog-body {
  padding: 20px;
}
.shad-dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--border);
  background: var(--panel-2);
}

.edit-student-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 6px;
  color: var(--muted);
  cursor: pointer;
  transition: color .15s ease, background .15s ease, border-color .15s ease;
}
.edit-student-btn:hover {
  color: var(--accent);
  background: var(--panel-2);
  border-color: var(--accent);
}
.edit-student-btn svg {
  width: 13px;
  height: 13px;
}
.edit-student-from-drawer {
  color: var(--muted);
  font-weight: 500;
  cursor: pointer;
}
.edit-student-from-drawer:hover {
  color: var(--accent);
  border-color: var(--accent);
}