/* Listen Lab — shared theme (matches sen.bma.cx / lt.bma.cx portals) */
:root {
  --bg: #0b0e14;
  --panel: #131824;
  --panel2: #1a2130;
  --panel3: #212a3c;
  --line: #232c3f;
  --text: #e8edf6;
  --muted: #8b96ab;
  --accent: #4cc2ff;
  --accent2: #7c5cff;
  --ok: #3ddc97;
  --warn: #ffb454;
  --err: #ff6b6b;
  --radius: 14px;
  --shadow: 0 12px 30px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html { color-scheme: dark; }
body {
  background: radial-gradient(1200px 700px at 70% -10%, #1b2340 0%, var(--bg) 55%);
  background-attachment: fixed;
  color: var(--text);
  font-family: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  line-height: 1.45;
  overscroll-behavior-y: none;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: #7fd4ff; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
::selection { background: rgba(76, 194, 255, .3); }

.wrap { width: 100%; max-width: 1240px; margin: 0 auto; padding: 22px 18px 60px; }
.wrap.narrow { max-width: 940px; }
.wrap.wide { max-width: 1400px; }

/* ---------------- header ---------------- */
header.appbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; flex-wrap: wrap; margin-bottom: 22px;
}
.brand { display: flex; align-items: center; gap: 11px; cursor: pointer; }
.brand h1 { font-size: 21px; font-weight: 750; letter-spacing: -.35px; display: flex; align-items: center; gap: 7px; }
.brand h1 span { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand .tag { font-size: 12px; color: var(--muted); margin-top: 1px; }
.bee { flex-shrink: 0; animation: bee-bob 2.6s ease-in-out infinite; }
.bee-wing-l, .bee-wing-r { animation: bee-flap .38s ease-in-out infinite; }
.bee-wing-l { transform-origin: 19px 26px; }
.bee-wing-r { transform-origin: 45px 26px; }
@keyframes bee-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-3.5px); } }
@keyframes bee-flap { 0%,100% { transform: rotate(0); } 50% { transform: rotate(16deg); } }

.hgroup { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.status-pill {
  display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted);
  background: var(--panel); border: 1px solid var(--line); padding: 7px 12px; border-radius: 999px;
  white-space: nowrap;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.dot.live { background: var(--ok); box-shadow: 0 0 8px var(--ok); animation: pulse 1.8s infinite; }
.dot.busy { background: var(--warn); box-shadow: 0 0 8px var(--warn); animation: pulse 1.1s infinite; }
.dot.err { background: var(--err); box-shadow: 0 0 8px var(--err); }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .45; } }

/* ---------------- buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 15px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel2); color: var(--text); font-size: 13.5px; font-weight: 600;
  transition: border-color .18s, background .18s, transform .12s, color .18s;
  white-space: nowrap; user-select: none;
}
.btn:hover { background: var(--panel3); border-color: #33405c; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: linear-gradient(90deg, var(--accent), var(--accent2)); border: none; color: #0b0e14; font-weight: 750; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover { color: var(--text); }
.btn-danger { color: var(--err); border-color: rgba(255, 107, 107, .35); background: rgba(255, 107, 107, .08); }
.btn-danger:hover { background: rgba(255, 107, 107, .16); }
.btn-sm { padding: 6px 10px; font-size: 12.5px; border-radius: 8px; }
.btn-xs { padding: 4px 8px; font-size: 11.5px; border-radius: 7px; }
.btn-icon { padding: 7px; width: 34px; height: 34px; border-radius: 9px; }
.btn-primary-ghost { border-color: rgba(76, 194, 255, .4); color: var(--accent); background: rgba(76, 194, 255, .08); }
.btn-primary-ghost:hover { background: rgba(76, 194, 255, .15); }

/* ---------------- panels / cards ---------------- */
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.panel-head h2 { font-size: 15px; font-weight: 700; letter-spacing: -.15px; }
.panel-head .sub { font-size: 12.5px; color: var(--muted); }

/* ---------------- form controls ---------------- */
label.lbl { display: block; font-size: 12px; font-weight: 650; color: var(--muted); margin-bottom: 5px; letter-spacing: .02em; }
input[type="text"], input[type="number"], input[type="search"], textarea, select {
  width: 100%; background: #0f1420; border: 1px solid var(--line); border-radius: 9px;
  padding: 9px 11px; font-size: 13.5px; color: var(--text); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(76, 194, 255, .12); }
textarea { resize: vertical; min-height: 70px; line-height: 1.5; }
input::placeholder, textarea::placeholder { color: #5c677c; }
select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 16px) 52%, calc(100% - 11px) 52%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 30px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row > .grow { flex: 1; min-width: 120px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.tiny { font-size: 11px; }
.mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.hint { font-size: 12px; color: var(--muted); }
.err-text { color: var(--err); font-size: 12.5px; }

/* ---------------- pills / badges ---------------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 2px 8px; border-radius: 999px;
  font-size: 10.5px; font-weight: 750; text-transform: uppercase; letter-spacing: .05em;
  background: var(--panel3); color: var(--muted); border: 1px solid var(--line);
}
.badge.gap { color: #4cc2ff; border-color: rgba(76,194,255,.35); background: rgba(76,194,255,.1); }
.badge.unscramble { color: #b79bff; border-color: rgba(124,92,255,.4); background: rgba(124,92,255,.12); }
.badge.short { color: #3ddc97; border-color: rgba(61,220,151,.35); background: rgba(61,220,151,.1); }
.badge.mcq { color: #ffb454; border-color: rgba(255,180,84,.35); background: rgba(255,180,84,.1); }
.badge.ok { color: var(--ok); border-color: rgba(61,220,151,.4); background: rgba(61,220,151,.1); }
.badge.warn { color: var(--warn); border-color: rgba(255,180,84,.4); background: rgba(255,180,84,.1); }
.badge.err { color: var(--err); border-color: rgba(255,107,107,.4); background: rgba(255,107,107,.1); }

/* ---------------- dashboard hero ---------------- */
.hero {
  background: linear-gradient(135deg, rgba(76,194,255,.08), rgba(124,92,255,.09)), var(--panel);
  border: 1px solid #26314a; border-radius: 20px; padding: 26px 26px 24px; margin-bottom: 26px;
  position: relative; overflow: hidden;
}
.hero:after {
  content: ""; position: absolute; width: 320px; height: 320px; right: -90px; top: -140px;
  background: radial-gradient(circle, rgba(124,92,255,.28), transparent 65%); pointer-events: none;
}
.hero h2 { font-size: 24px; letter-spacing: -.5px; margin-bottom: 6px; }
.hero p { color: var(--muted); font-size: 13.5px; margin-bottom: 18px; max-width: 620px; }
.url-row { display: flex; gap: 10px; align-items: stretch; position: relative; z-index: 1; }
.url-row .input-shell { flex: 1; position: relative; display: flex; align-items: center; }
.url-row .input-shell svg { position: absolute; left: 13px; opacity: .5; pointer-events: none; }
.url-row input { padding-left: 40px; height: 46px; font-size: 14px; border-radius: 11px; background: #0d121d; }
.url-row .btn { height: 46px; padding: 0 20px; border-radius: 11px; }
.hero .examples { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; font-size: 12px; color: var(--muted); }
.chip-link { font-size: 11.5px; color: var(--muted); border: 1px dashed #2c3852; padding: 4px 9px; border-radius: 8px; cursor: pointer; background: transparent; }
.chip-link:hover { color: var(--accent); border-color: rgba(76,194,255,.45); }

/* ---------------- worksheet grid ---------------- */
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 26px 0 13px; }
.section-head h3 { font-size: 15px; font-weight: 700; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 16px; }
.ws-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: border-color .18s, transform .18s, box-shadow .18s;
}
.ws-card:hover { border-color: #34425f; transform: translateY(-2px); box-shadow: var(--shadow); }
.ws-thumb { position: relative; aspect-ratio: 16/9; background: #0a0e16 center/cover no-repeat; display: block; }
.ws-thumb .dur { position: absolute; right: 8px; bottom: 8px; background: rgba(5,8,14,.82); color: #fff; font-size: 11px; font-weight: 700; padding: 2px 6px; border-radius: 5px; backdrop-filter: blur(4px); }
.ws-thumb .count { position: absolute; left: 8px; bottom: 8px; background: rgba(5,8,14,.82); color: var(--accent); font-size: 11px; font-weight: 700; padding: 2px 7px; border-radius: 5px; }
.ws-thumb .spinner { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(5,8,14,.55); }
.ws-body { padding: 13px 14px 12px; display: flex; flex-direction: column; gap: 7px; flex: 1; }
.ws-body h4 { font-size: 14px; font-weight: 680; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.ws-body .meta { font-size: 11.5px; color: var(--muted); display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.ws-actions { display: flex; gap: 6px; margin-top: auto; padding-top: 8px; }
.ws-actions .btn { flex: 1; }
.empty { text-align: center; padding: 54px 20px; border: 1px dashed #2b3650; border-radius: 18px; color: var(--muted); }
.empty h3 { color: var(--text); font-size: 16px; margin-bottom: 6px; }

/* ---------------- editor layout ---------------- */
.editor-top { display: flex; gap: 14px; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; margin-bottom: 16px; }
.editor-top .title-wrap { flex: 1; min-width: 260px; }
.title-input {
  font-size: 22px; font-weight: 750; letter-spacing: -.4px; background: transparent !important;
  border: 1px solid transparent !important; padding: 4px 6px !important; margin-left: -6px; border-radius: 8px !important;
}
.title-input:hover { border-color: var(--line) !important; }
.title-input:focus { background: #0f1420 !important; border-color: var(--accent) !important; }
.source-line { font-size: 12.5px; color: var(--muted); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 3px; }
.source-line .sep { opacity: .45; }

.editor-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(360px, 1fr); gap: 18px; align-items: start; }
@media (max-width: 1080px) { .editor-grid { grid-template-columns: 1fr; } }

.player-col { display: flex; flex-direction: column; gap: 12px; position: sticky; top: 14px; }
@media (max-width: 1080px) { .player-col { position: static; } }

/* ---------------- player ---------------- */
.player {
  background: #05070c; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.player-stage { position: relative; background: #000; aspect-ratio: 16/9; }
.player-stage video { width: 100%; height: 100%; display: block; background: #000; }
.player-stage .poster-btn {
  position: absolute; inset: 0; display: grid; place-items: center; cursor: pointer;
  background: rgba(4, 7, 12, .35); transition: background .2s;
}
.player-stage .poster-btn:hover { background: rgba(4, 7, 12, .2); }
.player-stage .poster-btn .big-play {
  width: 68px; height: 68px; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #081018;
  box-shadow: 0 10px 30px rgba(76,194,255,.35); transition: transform .18s;
}
.player-stage .poster-btn:hover .big-play { transform: scale(1.06); }
.player-stage .skip-toast {
  position: absolute; left: 50%; top: 14px; transform: translateX(-50%);
  background: rgba(8, 12, 20, .85); border: 1px solid #2b3650; color: #cfe5ff;
  padding: 5px 11px; border-radius: 999px; font-size: 11.5px; opacity: 0; transition: opacity .25s;
  pointer-events: none; backdrop-filter: blur(6px); white-space: nowrap;
}
.player-stage .skip-toast.show { opacity: 1; }

.pl-bar { padding: 8px 10px 9px; background: #0a0e16; border-top: 1px solid #1a2233; }
.pl-rail-wrap { padding: 5px 2px 2px; cursor: pointer; }
.pl-rail {
  position: relative; height: 7px; border-radius: 999px; background: #1d2638; overflow: hidden;
}
.pl-buffer { position: absolute; inset: 0; width: 0; background: #2a3550; }
.pl-played { position: absolute; inset: 0; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent2)); }
.pl-cuts { position: absolute; inset: 0; pointer-events: none; }
.pl-cut { position: absolute; top: 0; bottom: 0; background: repeating-linear-gradient(45deg, rgba(255,107,107,.75) 0 5px, rgba(255,107,107,.35) 5px 10px); }
.pl-cut.mute { background: repeating-linear-gradient(45deg, rgba(255,180,84,.75) 0 5px, rgba(255,180,84,.35) 5px 10px); }
.pl-cut.pending { background: rgba(76,194,255,.55); border-left: 2px solid var(--accent); border-right: 2px solid var(--accent); }
.pl-marks { position: absolute; inset: 0; pointer-events: none; }
.pl-mark { position: absolute; top: 50%; transform: translate(-50%, -50%); width: 11px; height: 11px; border-radius: 3px; border: 2px solid #0a0e16; }
.pl-mark.gap { background: var(--accent); }
.pl-mark.unscramble { background: #b79bff; }
.pl-mark.short { background: var(--ok); }
.pl-mark.mcq { background: var(--warn); }
.pl-hover-time { position: absolute; bottom: 18px; transform: translateX(-50%); background: #05070c; border: 1px solid var(--line); padding: 2px 6px; border-radius: 5px; font-size: 10.5px; color: #cfe0f5; opacity: 0; pointer-events: none; }
.pl-rail-wrap:hover .pl-hover-time { opacity: 1; }

.pl-row { display: flex; align-items: center; gap: 6px; margin-top: 6px; }
.pl-btn {
  background: transparent; border: none; color: #c3cfe2; width: 32px; height: 30px; border-radius: 7px;
  display: grid; place-items: center; transition: background .15s, color .15s;
}
.pl-btn:hover { background: #1a2233; color: #fff; }
.pl-btn.play { width: 36px; color: #fff; }
.pl-btn.on { color: var(--accent); }
.pl-time { font-size: 11.5px; color: #9fb0c8; font-variant-numeric: tabular-nums; padding: 0 4px; white-space: nowrap; }
.pl-time .cur { color: #e8edf6; font-weight: 650; }
.pl-spacer { flex: 1; }
.pl-speed { position: relative; }
.pl-speed-menu {
  position: absolute; bottom: 36px; right: 0; background: #0d1320; border: 1px solid var(--line);
  border-radius: 9px; padding: 4px; display: none; z-index: 20; min-width: 78px; box-shadow: var(--shadow);
}
.pl-speed-menu.open { display: block; }
.pl-speed-menu button { display: block; width: 100%; text-align: left; padding: 6px 10px; background: transparent; border: none; border-radius: 6px; font-size: 12.5px; color: var(--text); }
.pl-speed-menu button:hover, .pl-speed-menu button.active { background: rgba(76,194,255,.14); color: var(--accent); }
.vol-wrap { display: flex; align-items: center; gap: 4px; }
.vol-wrap input[type="range"] { width: 62px; accent-color: var(--accent); height: 3px; }

/* teacher timeline tools */
.tl-tools { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.tl-tools .pending { font-size: 11.5px; color: var(--warn); background: rgba(255,180,84,.1); border: 1px solid rgba(255,180,84,.3); padding: 4px 8px; border-radius: 7px; }

/* ---------------- tabs ---------------- */
.tabs { display: flex; gap: 3px; background: var(--panel2); border: 1px solid var(--line); border-radius: 11px; padding: 3px; margin-bottom: 12px; overflow-x: auto; }
.tabs button {
  flex: 1; background: transparent; border: none; color: var(--muted); font-size: 12.5px; font-weight: 650;
  padding: 7px 9px; border-radius: 8px; white-space: nowrap; transition: background .15s, color .15s;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.tabs button:hover { color: var(--text); }
.tabs button.active { background: #263149; color: #fff; }
.tabs .n { font-size: 10.5px; background: var(--panel3); border-radius: 999px; padding: 1px 6px; color: var(--muted); }
.tabs button.active .n { background: rgba(76,194,255,.2); color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadein .18s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: none; } }

/* ---------------- transcript ---------------- */
.tr-tools { display: flex; gap: 8px; margin-bottom: 10px; }
.tr-list { max-height: 62vh; overflow-y: auto; padding-right: 4px; display: flex; flex-direction: column; gap: 2px; }
.tr-cue {
  display: grid; grid-template-columns: 44px 1fr auto; gap: 9px; align-items: start;
  padding: 7px 8px; border-radius: 8px; border: 1px solid transparent; cursor: pointer;
  transition: background .13s, border-color .13s;
}
.tr-cue:hover { background: #171e2c; }
.tr-cue.active { background: rgba(76,194,255,.09); border-color: rgba(76,194,255,.28); }
.tr-cue .t { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; padding-top: 2px; }
.tr-cue .txt { font-size: 13px; line-height: 1.45; }
.tr-cue .plus {
  opacity: 0; background: var(--panel3); border: 1px solid var(--line); color: var(--text);
  width: 24px; height: 24px; border-radius: 7px; display: grid; place-items: center; font-size: 15px; line-height: 1;
  transition: opacity .15s;
}
.tr-cue:hover .plus, .tr-cue.active .plus { opacity: 1; }
.tr-cue .plus:hover { border-color: var(--accent); color: var(--accent); }
.tr-empty { text-align: center; color: var(--muted); font-size: 13px; padding: 30px 10px; }

/* ---------------- exercise list ---------------- */
.ex-list { display: flex; flex-direction: column; gap: 9px; max-height: 62vh; overflow-y: auto; padding-right: 4px; }
.ex-card { background: var(--panel2); border: 1px solid var(--line); border-radius: 11px; padding: 10px 11px; }
.ex-card .top { display: flex; align-items: center; gap: 7px; margin-bottom: 5px; }
.ex-card .at { font-size: 11.5px; color: var(--muted); font-variant-numeric: tabular-nums; }
.ex-card .at:hover { color: var(--accent); cursor: pointer; }
.ex-card .pts { margin-left: auto; font-size: 10.5px; color: var(--muted); }
.ex-card .body { font-size: 13px; line-height: 1.5; }
.ex-card .body .blank { color: var(--accent); border-bottom: 2px solid rgba(76,194,255,.5); padding: 0 4px; font-weight: 650; }
.ex-card .opts { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 6px; }
.ex-card .opt { font-size: 11.5px; background: #0f1420; border: 1px solid var(--line); padding: 2px 7px; border-radius: 6px; color: var(--muted); }
.ex-card .opt.ok { color: var(--ok); border-color: rgba(61,220,151,.35); background: rgba(61,220,151,.08); }
.ex-card .foot { display: flex; gap: 5px; margin-top: 8px; justify-content: flex-end; }
.ex-card .foot .btn { padding: 3px 8px; font-size: 11.5px; border-radius: 6px; }
.ex-summary { line-height: 1.5; }
.ex-summary .corr { color: var(--ok); font-weight: 650; }
.ex-summary .wrong { color: var(--err); }

/* ---------------- cuts ---------------- */
.cut-row { display: grid; grid-template-columns: 1fr auto auto auto; gap: 8px; align-items: center; background: var(--panel2); border: 1px solid var(--line); border-radius: 10px; padding: 8px 9px; margin-bottom: 7px; }
.cut-row .range { font-size: 12.5px; font-variant-numeric: tabular-nums; }
.cut-row .range b { color: var(--text); font-weight: 650; }
.cut-row .len { font-size: 11px; color: var(--muted); }
.mode-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.mode-toggle button { background: transparent; border: none; color: var(--muted); font-size: 11px; padding: 4px 8px; }
.mode-toggle button.active { background: rgba(76,194,255,.16); color: var(--accent); }

/* ---------------- modal ---------------- */
.modal-back { position: fixed; inset: 0; background: rgba(3, 6, 11, .72); backdrop-filter: blur(3px); display: none; align-items: center; justify-content: center; z-index: 100; padding: 16px; }
.modal-back.open { display: flex; }
.modal {
  width: min(620px, 100%); max-height: 92vh; overflow-y: auto; background: var(--panel);
  border: 1px solid #2b3550; border-radius: 16px; padding: 20px; box-shadow: 0 30px 80px rgba(0,0,0,.6);
  animation: pop .16s ease;
}
@keyframes pop { from { opacity: 0; transform: scale(.97) translateY(6px); } to { opacity: 1; transform: none; } }
.modal h3 { font-size: 16px; margin-bottom: 2px; }
.modal .sub { font-size: 12.5px; color: var(--muted); margin-bottom: 14px; }
.modal .form-row { margin-bottom: 12px; }
.modal .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.modal .actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }
@media (max-width: 520px) { .modal .form-grid { grid-template-columns: 1fr; } }
.opt-row { display: flex; gap: 8px; align-items: center; margin-bottom: 7px; }
.opt-row input[type="radio"] { accent-color: var(--accent); width: 17px; height: 17px; flex: 0 0 auto; }
.opt-row .rm { color: var(--muted); background: transparent; border: none; font-size: 17px; padding: 0 3px; }
.opt-row .rm:hover { color: var(--err); }
.seg-btns { display: flex; gap: 4px; background: var(--panel2); border: 1px solid var(--line); border-radius: 9px; padding: 3px; flex-wrap: wrap; }
.seg-btns button { flex: 1; background: transparent; border: none; color: var(--muted); font-size: 12px; padding: 5px 8px; border-radius: 6px; }
.seg-btns button.active { background: #2b3650; color: #fff; }
.time-input { display: flex; gap: 6px; align-items: center; }
.time-input input { width: 110px; }

/* ---------------- toast ---------------- */
.toasts { position: fixed; right: 18px; bottom: 18px; display: flex; flex-direction: column; gap: 8px; z-index: 200; }
.toast {
  background: #121a29; border: 1px solid #2c3a56; border-left: 3px solid var(--accent);
  padding: 10px 14px; border-radius: 10px; font-size: 12.5px; box-shadow: var(--shadow);
  animation: slidein .2s ease; max-width: 340px;
}
.toast.ok { border-left-color: var(--ok); }
.toast.warn { border-left-color: var(--warn); }
.toast.err { border-left-color: var(--err); }
@keyframes slidein { from { opacity: 0; transform: translateX(16px); } to { opacity: 1; transform: none; } }

/* ---------------- student ---------------- */
.cover {
  position: relative; border-radius: 20px; overflow: hidden; border: 1px solid #26314a;
  background: var(--panel); min-height: 380px; display: flex; align-items: flex-end;
}
.cover .bg { position: absolute; inset: 0; background-size: cover; background-position: center; filter: blur(2px) brightness(.42); transform: scale(1.04); }
.cover .grad { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(9,12,20,.2) 0%, rgba(9,12,20,.75) 62%, rgba(9,12,20,.97) 100%); }
.cover .inner { position: relative; padding: 30px; width: 100%; }
.cover h1 { font-size: 27px; letter-spacing: -.6px; line-height: 1.2; margin-bottom: 7px; max-width: 760px; }
.cover .meta { color: #b9c6da; font-size: 13px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.cover .start-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; max-width: 560px; }
.cover .start-row input { height: 44px; background: rgba(10,14,22,.85); }
.cover .start-row .btn { height: 44px; padding: 0 22px; }
.cover .note { margin-top: 12px; font-size: 12px; color: #8fa0b8; }
.stat-row { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 18px; }
.stat { font-size: 12px; color: #9fb0c8; }
.stat b { display: block; font-size: 19px; color: #fff; font-weight: 750; letter-spacing: -.3px; }

.student-shell { max-width: 1000px; margin: 0 auto; }
.stu-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.stu-head .t { min-width: 0; }
.stu-head h1 { font-size: 17px; font-weight: 700; letter-spacing: -.2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stu-head .s { font-size: 11.5px; color: var(--muted); }
.score-chip { display: inline-flex; align-items: center; gap: 6px; background: var(--panel); border: 1px solid var(--line); padding: 6px 11px; border-radius: 999px; font-size: 12px; color: var(--muted); }
.score-chip b { color: var(--accent); font-size: 14px; }

.q-overlay {
  position: absolute; inset: 0; display: none; align-items: center; justify-content: center;
  background: linear-gradient(180deg, rgba(4,7,12,.45), rgba(4,7,12,.88)); backdrop-filter: blur(2px);
  padding: 16px; z-index: 10; overflow-y: auto;
}
.q-overlay.show { display: flex; animation: fadein .2s ease; }
.q-card {
  width: min(560px, 100%); background: rgba(16, 22, 35, .97); border: 1px solid #32405c;
  border-radius: 16px; padding: 18px; box-shadow: 0 24px 60px rgba(0,0,0,.55);
}
.q-card .q-top { display: flex; align-items: center; gap: 8px; margin-bottom: 9px; font-size: 11px; color: var(--muted); }
.q-card .q-top .pts { margin-left: auto; }
.q-card h3 { font-size: 17px; line-height: 1.4; margin-bottom: 4px; font-weight: 650; }
.q-card .q-instr { font-size: 12px; color: var(--muted); margin-bottom: 13px; }
.q-sentence { font-size: 16px; line-height: 1.6; margin-bottom: 13px; }
.q-sentence .blank { display: inline-block; min-width: 74px; text-align: center; border-bottom: 2px solid var(--accent); color: var(--accent); font-weight: 700; padding: 0 6px; }
.q-options { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 520px) { .q-options { grid-template-columns: 1fr; } }
.q-opt {
  text-align: left; background: #0e1522; border: 1px solid #2a3550; border-radius: 10px;
  padding: 11px 13px; font-size: 14px; color: var(--text); transition: border-color .15s, background .15s;
}
.q-opt:hover:not(:disabled) { border-color: rgba(76,194,255,.5); background: #121b2b; }
.q-opt.correct { border-color: var(--ok); background: rgba(61,220,151,.13); color: #b8ffe1; }
.q-opt.wrong { border-color: var(--err); background: rgba(255,107,107,.12); color: #ffc9c9; }
.q-opt:disabled { cursor: default; opacity: .92; }

.chips { display: flex; flex-wrap: wrap; gap: 7px; min-height: 46px; padding: 8px; background: #0a101a; border: 1px dashed #2c3a56; border-radius: 10px; margin-bottom: 10px; }
.chips.answer { border-style: solid; border-color: #263450; background: #0d1420; }
.chip {
  background: var(--panel3); border: 1px solid #33415f; border-radius: 8px; padding: 6px 10px;
  font-size: 13.5px; color: var(--text); transition: background .12s, transform .12s;
}
.chip:hover { background: #2c3852; }
.chip.used { opacity: .22; pointer-events: none; }
.q-input { display: flex; gap: 8px; }
.q-input input { height: 42px; }
.q-feedback { margin-top: 12px; font-size: 13px; display: none; }
.q-feedback.show { display: block; }
.q-feedback .good { color: var(--ok); font-weight: 650; }
.q-feedback .bad { color: var(--err); font-weight: 650; }
.q-feedback .ans { color: #dbe7f7; }
.q-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 14px; }

.result-card { text-align: center; padding: 36px 24px; }
.ring { --p: 0; width: 132px; height: 132px; margin: 0 auto 16px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--accent) calc(var(--p) * 1%), #1d2638 0); position: relative; }
.ring:after { content: ""; position: absolute; inset: 9px; border-radius: 50%; background: var(--panel); }
.ring .val { position: relative; z-index: 1; font-size: 33px; font-weight: 800; letter-spacing: -1px; }
.ring .val small { font-size: 13px; color: var(--muted); font-weight: 600; }
.result-card h2 { font-size: 24px; letter-spacing: -.5px; margin-bottom: 6px; }
.result-card p { color: var(--muted); font-size: 13.5px; }
.review { margin-top: 26px; text-align: left; display: flex; flex-direction: column; gap: 8px; }
.review .r-item { background: var(--panel2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 13px; }
.review .r-item .head { display: flex; gap: 8px; align-items: center; margin-bottom: 3px; }
.review .r-item .head .t { font-size: 11px; color: var(--muted); }
.review .sum { margin-top: 12px; font-size: 13px; color: var(--muted); }

/* waiting page */
.wait-box { text-align: center; padding: 60px 24px; }
.wait-box h2 { font-size: 22px; margin-bottom: 8px; }
.wait-box p { color: var(--muted); font-size: 13.5px; }
.pbar { height: 6px; border-radius: 999px; background: #1d2638; overflow: hidden; margin: 18px auto 8px; max-width: 380px; }
.pbar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width .4s; }

/* spinner */
.spinner { width: 26px; height: 26px; border: 3px solid rgba(255,255,255,.16); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* results table */
.table-wrap { overflow-x: auto; }
table.res { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.res th { text-align: left; color: var(--muted); font-weight: 600; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; padding: 7px 9px; border-bottom: 1px solid var(--line); }
table.res td { padding: 8px 9px; border-bottom: 1px solid #1b2334; }
table.res tr:hover td { background: #161e2d; }
table.res .pct { font-weight: 750; }
table.res .pct.ok { color: var(--ok); }
table.res .pct.bad { color: var(--warn); }
table.res tr.res-row { cursor: pointer; }
table.res tr.res-detail td { background: #0e1421; padding: 10px 12px; }
table.res .d { display: flex; gap: 8px; align-items: flex-start; padding: 4px 0; font-size: 12px; line-height: 1.45; }
table.res .d .q { flex: 1; }
table.res .d .expected { color: var(--ok); font-weight: 650; white-space: nowrap; }
table.res .d.bad .q { color: #ffd3d3; }

/* settings */
.set-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 11px 0; border-bottom: 1px solid #1b2334; }
.set-row:last-child { border-bottom: none; }
.set-row .lbl2 { font-size: 13px; font-weight: 600; }
.set-row .desc { font-size: 11.5px; color: var(--muted); margin-top: 1px; }
.switch { position: relative; width: 40px; height: 23px; flex: 0 0 auto; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span { position: absolute; inset: 0; background: #2a3550; border-radius: 999px; transition: background .18s; cursor: pointer; }
.switch span:before { content: ""; position: absolute; width: 17px; height: 17px; left: 3px; top: 3px; background: #8b96ab; border-radius: 50%; transition: transform .18s, background .18s; }
.switch input:checked + span { background: rgba(76,194,255,.35); }
.switch input:checked + span:before { transform: translateX(17px); background: var(--accent); }

/* misc */
.foot-note { margin-top: 34px; text-align: center; font-size: 11.5px; color: #5c677c; }
.kbd { font-family: ui-monospace, monospace; font-size: 11px; background: #1a2233; border: 1px solid #2c3a56; border-bottom-width: 2px; border-radius: 5px; padding: 1px 5px; color: #b6c4d8; }
.link-btn { background: none; border: none; color: var(--accent); font-size: 12.5px; padding: 0; }
.link-btn:hover { text-decoration: underline; }
.divider { height: 1px; background: var(--line); margin: 14px 0; }
.scroll-thin::-webkit-scrollbar { width: 8px; }
.scroll-thin::-webkit-scrollbar-thumb { background: #29354d; border-radius: 99px; }
.scroll-thin::-webkit-scrollbar-track { background: transparent; }

/* small screens */
@media (max-width: 620px) {
  .wrap { padding: 14px 11px 44px; }
  header.appbar { gap: 9px; }
  .brand .tag { display: none; }
  .hero { padding: 20px 16px; border-radius: 16px; }
  .hero h2 { font-size: 20px; }
  .url-row { flex-direction: column; }
  .url-row .btn { width: 100%; }
  .cover { min-height: 330px; }
  .cover .inner { padding: 20px 16px; }
  .cover h1 { font-size: 22px; }
  .cover .start-row { flex-direction: column; align-items: stretch; }
  .cover .start-row .btn { width: 100%; }
  .vol-wrap input[type="range"] { display: none; }
  .pl-time { font-size: 10.5px; }
  .pl-btn { width: 28px; }
  .tabs button { padding: 7px 6px; font-size: 11.5px; }
  .tabs .n { display: none; }
  .editor-top .hgroup { width: 100%; }
  .editor-top .hgroup .btn { flex: 1; }
  .q-card { padding: 15px; }
  .q-card h3 { font-size: 15.5px; }
  .q-opt { padding: 10px; font-size: 13.5px; }
  .result-card { padding: 26px 14px; }
  .review .r-item { font-size: 12.5px; }
  .title-input { font-size: 19px; }
}