/* ON.SCHOOL Quiz */
.osq-app {
  --osq-primary: #2f5bea;
  --osq-primary-dark: #1f44c4;
  --osq-primary-soft: #eef2ff;
  --osq-accent: #f59e0b;
  --osq-accent-dark: #d97706;
  --osq-good: #16a34a;
  --osq-good-soft: #dcfce7;
  --osq-mid: #d97706;
  --osq-mid-soft: #fef3c7;
  --osq-bad: #dc2626;
  --osq-bad-soft: #fee2e2;
  --osq-skip: #94a3b8;
  --osq-skip-soft: #f1f5f9;
  --osq-text: #0f172a;
  --osq-muted: #64748b;
  --osq-border: #e2e8f0;
  --osq-bg: #f8fafc;
  --osq-card: #ffffff;
  --osq-radius: 14px;
  --osq-shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 4px 16px rgba(15, 23, 42, .05);
  color: var(--osq-text);
  max-width: 980px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.55;
  box-sizing: border-box;
}
.osq-app *, .osq-app *::before, .osq-app *::after { box-sizing: border-box; }
.osq-app.osq-admin-app { max-width: none; margin-top: 12px; }
.osq-app h2, .osq-app h3 { margin: 0 0 .4em; line-height: 1.25; color: var(--osq-text); }
.osq-app h2 { font-size: 1.5em; }
.osq-app h3 { font-size: 1.15em; }
.osq-app p { margin: 0 0 .8em; }
.osq-app a { color: var(--osq-primary); }
.osq-app [hidden] { display: none !important; }

/* basics */
.osq-card { background: var(--osq-card); border: 1px solid var(--osq-border); border-radius: var(--osq-radius); padding: 20px; margin-bottom: 16px; box-shadow: var(--osq-shadow); }
.osq-muted { color: var(--osq-muted); }
.osq-block { display: block; margin-bottom: 8px; }
.osq-center { text-align: center; }
.osq-loading { padding: 48px 16px; text-align: center; color: var(--osq-muted); }
.osq-loading::before { content: ""; display: block; width: 32px; height: 32px; margin: 0 auto 12px; border: 3px solid var(--osq-border); border-top-color: var(--osq-primary); border-radius: 50%; animation: osq-spin .8s linear infinite; }
@keyframes osq-spin { to { transform: rotate(360deg); } }
.osq-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.osq-row-center { justify-content: center; }
.osq-row-tight { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.osq-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; }
.osq-grow { flex: 1; min-width: 0; }
.osq-spacer { flex: 1; }
.osq-pre { white-space: pre-wrap; word-break: break-word; }
.osq-section-title { margin: 24px 0 12px !important; }

/* form */
.osq-app input[type=text], .osq-app input[type=email], .osq-app input[type=url], .osq-app input[type=number],
.osq-app input[type=search], .osq-app input:not([type]), .osq-app textarea, .osq-app select {
  width: 100%; font: inherit; font-size: 15px; color: var(--osq-text); background: #fff;
  border: 1.5px solid var(--osq-border); border-radius: 10px; padding: 9px 12px; margin: 0; min-height: 42px;
  transition: border-color .15s, box-shadow .15s; box-shadow: none;
}
.osq-app textarea { resize: vertical; min-height: 64px; }
.osq-app input:focus, .osq-app textarea:focus, .osq-app select:focus { outline: none; border-color: var(--osq-primary); box-shadow: 0 0 0 3px rgba(47, 91, 234, .15); }
.osq-field { display: block; margin-bottom: 12px; }
.osq-label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 5px; }
.osq-field small { display: block; margin-top: 4px; font-size: 13px; }
.osq-check { display: flex; gap: 10px; align-items: flex-start; padding: 7px 0; cursor: pointer; font-size: 15px; }
.osq-check input, .osq-check-inline input { width: 18px; height: 18px; margin: 3px 0 0; flex: none; accent-color: var(--osq-primary); }
.osq-check-inline { display: inline-flex; gap: 6px; align-items: center; font-size: 14px; cursor: pointer; }
.osq-check-inline input { margin: 0; }
.osq-public-check { margin-top: 8px; padding: 12px; border: 1.5px dashed var(--osq-accent); border-radius: 10px; background: #fffbeb; }
.osq-hp { position: absolute !important; left: -9999px !important; width: 1px !important; height: 1px !important; opacity: 0; }

/* buttons */
.osq-btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; font: inherit; font-size: 15px; font-weight: 600; line-height: 1.2;
  padding: 10px 16px; min-height: 42px; border-radius: 10px; border: 1.5px solid var(--osq-border); background: #fff; color: var(--osq-text) !important;
  cursor: pointer; text-decoration: none !important; transition: background .15s, border-color .15s, transform .05s; white-space: nowrap; }
.osq-btn:hover { background: var(--osq-bg); border-color: #cbd5e1; }
.osq-btn:active { transform: translateY(1px); }
.osq-btn:disabled { opacity: .55; cursor: not-allowed; }
.osq-btn-primary { background: var(--osq-primary); border-color: var(--osq-primary); color: #fff !important; }
.osq-btn-primary:hover { background: var(--osq-primary-dark); border-color: var(--osq-primary-dark); }
.osq-btn-accent { background: var(--osq-accent); border-color: var(--osq-accent); color: #1f1300 !important; }
.osq-btn-accent:hover { background: var(--osq-accent-dark); border-color: var(--osq-accent-dark); }
.osq-btn-ghost { background: transparent; border-color: transparent; color: var(--osq-primary) !important; }
.osq-btn-ghost:hover { background: var(--osq-primary-soft); border-color: transparent; }
.osq-btn-danger { color: var(--osq-bad) !important; border-color: var(--osq-bad-soft); }
.osq-btn-danger:hover { background: var(--osq-bad-soft); border-color: var(--osq-bad); }
.osq-btn-sm { font-size: 13px; padding: 6px 11px; min-height: 34px; border-radius: 8px; }
.osq-btn-lg { font-size: 17px; padding: 13px 24px; min-height: 50px; }
.osq-icon-btn { flex: none; width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; font-size: 15px; line-height: 1;
  border: 1px solid var(--osq-border); border-radius: 8px; background: #fff; color: var(--osq-muted); cursor: pointer; padding: 0; }
.osq-icon-btn:hover:not(:disabled) { background: var(--osq-bg); color: var(--osq-text); }
.osq-icon-btn:disabled { opacity: .35; cursor: default; }
.osq-icon-btn.osq-danger:hover { background: var(--osq-bad-soft); color: var(--osq-bad); border-color: var(--osq-bad-soft); }

/* alerts, chips, badges */
.osq-alert { border-radius: 10px; padding: 12px 14px; margin: 0 0 14px; font-size: 15px; border: 1px solid; }
.osq-alert-error { background: var(--osq-bad-soft); border-color: #fecaca; color: #991b1b; }
.osq-alert-warn { background: var(--osq-mid-soft); border-color: #fde68a; color: #92400e; }
.osq-alert-info { background: var(--osq-primary-soft); border-color: #c7d2fe; color: #1e3a8a; }
.osq-errors { background: var(--osq-bad-soft); border: 1px solid #fecaca; color: #991b1b; border-radius: 10px; padding: 12px 16px; margin: 16px 0; }
.osq-errors ul { margin: 6px 0 0 18px; padding: 0; }
.osq-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 16px; }
.osq-chip { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; font-weight: 600; background: var(--osq-bg); border: 1px solid var(--osq-border); color: #334155; border-radius: 999px; padding: 3px 10px; }
.osq-badge { display: inline-block; font-size: 12.5px; font-weight: 700; border-radius: 999px; padding: 3px 10px; white-space: nowrap; }
.osq-badge-correct { background: var(--osq-good-soft); color: #166534; }
.osq-badge-partial { background: var(--osq-mid-soft); color: #92400e; }
.osq-badge-wrong { background: var(--osq-bad-soft); color: #991b1b; }
.osq-badge-skipped { background: var(--osq-skip-soft); color: #475569; }
.osq-pill { display: inline-block; font-weight: 700; font-size: 13px; padding: 2px 9px; border-radius: 999px; }
.osq-pill.osq-good, .osq-stat.osq-good strong { color: #166534; }
.osq-pill.osq-good { background: var(--osq-good-soft); }
.osq-pill.osq-mid { background: var(--osq-mid-soft); color: #92400e; }
.osq-pill.osq-bad { background: var(--osq-bad-soft); color: #991b1b; }
small.osq-good, .osq-big-pct.osq-good { color: var(--osq-good); }
small.osq-mid, .osq-big-pct.osq-mid, .osq-stat.osq-mid strong { color: var(--osq-mid); }
small.osq-bad, .osq-big-pct.osq-bad, .osq-stat.osq-bad strong { color: var(--osq-bad); }

/* toast */
.osq-toast { position: fixed; z-index: 99999; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; transition: all .25s;
  background: #0f172a; color: #fff; padding: 11px 18px; border-radius: 10px; font-size: 15px; box-shadow: 0 8px 24px rgba(0,0,0,.2); max-width: calc(100vw - 32px); }
.osq-toast.osq-show { opacity: 1; transform: translate(-50%, 0); }
.osq-toast-error { background: #b91c1c; }
.osq-toast-ok { background: #15803d; }
.osq-toast-warn { background: #b45309; }

/* landing */
.osq-landing { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.osq-hero { margin: 0; display: flex; flex-direction: column; justify-content: center; padding: 28px; }
.osq-hero .osq-btn { align-self: flex-start; }
.osq-hero .osq-row { flex-wrap: nowrap; }
.osq-code-input { font-size: 22px !important; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; text-align: center; min-height: 52px !important; }
.osq-mine { grid-column: 1 / -1; margin: 0; }
.osq-mine-list { list-style: none; margin: 8px 0 10px; padding: 0; }
.osq-mine-list li { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--osq-border); }
.osq-mine-list code, .osq-code-chip { font-family: ui-monospace, Menlo, Consolas, monospace; font-weight: 700; letter-spacing: .08em; background: var(--osq-primary-soft); color: var(--osq-primary-dark); padding: 2px 8px; border-radius: 6px; font-size: 14px; }

/* share */
.osq-share { text-align: left; margin: 16px 0; }
.osq-share-code { display: flex; flex-direction: column; align-items: center; background: var(--osq-primary-soft); border-radius: 12px; padding: 14px; margin-bottom: 14px; }
.osq-share-code strong { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 38px; letter-spacing: .22em; color: var(--osq-primary-dark); line-height: 1.2; }
.osq-share-row { margin-bottom: 12px; }
.osq-share-row label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.osq-share-row small { display: block; font-size: 13px; margin-top: 3px; }
.osq-secret label { color: #92400e; }
.osq-copy { display: flex; gap: 6px; }
.osq-copy input { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px !important; background: var(--osq-bg) !important; }
.osq-success { text-align: center; }
.osq-success-icon { width: 60px; height: 60px; margin: 4px auto 12px; border-radius: 50%; background: var(--osq-good-soft); color: var(--osq-good); font-size: 32px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.osq-success .osq-row { justify-content: center; }

/* builder */
.osq-topbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-bottom: 16px; }
.osq-topbar h2 { margin: 0; flex: 1; min-width: 200px; }
.osq-back { font-size: 14px; text-decoration: none; font-weight: 600; }
.osq-settings summary, .osq-extra summary { cursor: pointer; font-weight: 700; list-style: revert; }
.osq-settings[open] summary { margin-bottom: 12px; }
.osq-qcard { border-left: 4px solid var(--osq-primary); position: relative; }
.osq-qcard.osq-has-error { border-color: var(--osq-bad); box-shadow: 0 0 0 3px var(--osq-bad-soft); }
.osq-qcard[data-type=matching], .osq-qcard[data-type=ordering] { border-left-color: var(--osq-accent); }
.osq-qcard[data-type=truefalse], .osq-qcard[data-type=fill] { border-left-color: #8b5cf6; }
.osq-qcard[data-type=short], .osq-qcard[data-type=numeric] { border-left-color: #0ea5e9; }
.osq-qhead { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 6px; }
.osq-qnum { flex: none; width: 32px; height: 32px; border-radius: 50%; background: var(--osq-primary); color: #fff; font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 15px; }
.osq-type-select { width: auto !important; flex: 1; min-width: 180px; max-width: 300px; font-weight: 600; }
.osq-points { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; color: var(--osq-muted); }
.osq-points input { width: 76px !important; }
.osq-qtools { display: flex; gap: 4px; margin-left: auto; }
.osq-type-hint { display: block; margin: 0 0 8px 40px; font-size: 13px; }
.osq-qtext { font-size: 16px !important; margin-bottom: 6px !important; }
.osq-qbody { margin-top: 10px; }
.osq-opt { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; padding: 2px; border-radius: 10px; }
.osq-opt > input[type=text] { flex: 1; }
.osq-opt-mark { flex: none; width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; cursor: pointer; }
.osq-opt-mark input, .osq-opt > input[type=radio] { width: 20px; height: 20px; margin: 0; accent-color: var(--osq-good); cursor: pointer; }
label.osq-opt { padding: 8px 12px; border: 1.5px solid var(--osq-border); cursor: pointer; max-width: 320px; }
.osq-opt-correct > input[type=text] { border-color: var(--osq-good) !important; background: #f0fdf4 !important; }
label.osq-opt.osq-opt-correct { border-color: var(--osq-good); background: #f0fdf4; }
.osq-pair { display: grid; grid-template-columns: 1fr 26px 1fr 34px; gap: 8px; align-items: center; margin-bottom: 8px; }
.osq-pair-head { font-size: 13px; font-weight: 600; color: var(--osq-muted); margin-bottom: 4px; }
.osq-pair-arrow { text-align: center; color: var(--osq-muted); font-weight: 700; }
.osq-order-num { flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--osq-bg); border: 1px solid var(--osq-border); font-weight: 700; font-size: 13px; display: flex; align-items: center; justify-content: center; }
.osq-fill-preview { background: var(--osq-bg); border-radius: 10px; padding: 10px 12px; margin-top: 6px; font-size: 15px; white-space: pre-wrap; }
.osq-blank-chip { display: inline-block; background: #ede9fe; color: #5b21b6; border-bottom: 2px solid #8b5cf6; border-radius: 4px; padding: 0 8px; margin: 0 2px; font-weight: 600; }
.osq-extra { margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--osq-border); font-size: 14px; }
.osq-extra summary { color: var(--osq-muted); font-weight: 600; margin-bottom: 8px; }
.osq-addbar { background: var(--osq-card); border: 2px dashed #cbd5e1; border-radius: var(--osq-radius); padding: 16px; margin-bottom: 16px; }
.osq-addbtns { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 8px; }
.osq-addbtn { display: flex; align-items: center; gap: 8px; font: inherit; font-size: 14px; font-weight: 600; text-align: left; padding: 10px; border-radius: 10px;
  border: 1.5px solid var(--osq-border); background: #fff; color: var(--osq-text); cursor: pointer; line-height: 1.25; }
.osq-addbtn:hover { border-color: var(--osq-primary); background: var(--osq-primary-soft); }
.osq-addicon { flex: none; width: 28px; height: 28px; border-radius: 8px; background: var(--osq-primary-soft); color: var(--osq-primary); display: flex; align-items: center; justify-content: center; font-size: 16px; }
.osq-savebar { position: sticky; bottom: 0; z-index: 5; display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 12px;
  padding: 12px 16px; background: rgba(255,255,255,.95); backdrop-filter: blur(6px); border: 1px solid var(--osq-border); border-radius: var(--osq-radius); box-shadow: 0 -4px 20px rgba(15,23,42,.06); }
.osq-total { margin-right: auto; font-size: 14px; }
.osq-empty { text-align: center; padding: 20px; }

/* player */
.osq-intro { max-width: 640px; margin-left: auto; margin-right: auto; padding: 28px; }
.osq-intro .osq-btn-lg { width: 100%; margin: 6px 0 10px; }
.osq-desc { white-space: pre-wrap; }
.osq-player { max-width: 760px; margin: 0 auto; }
.osq-player-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 8px; }
.osq-player-title { font-weight: 700; font-size: 17px; }
.osq-progress-text { font-size: 14px; color: var(--osq-muted); font-weight: 600; }
.osq-timer { font-family: ui-monospace, Menlo, Consolas, monospace; font-weight: 700; font-size: 15px; background: var(--osq-bg); border: 1px solid var(--osq-border); padding: 3px 10px; border-radius: 8px; }
.osq-timer-warn { background: var(--osq-bad-soft); color: var(--osq-bad); border-color: #fecaca; animation: osq-pulse 1s infinite; }
@keyframes osq-pulse { 50% { opacity: .6; } }
.osq-progress { height: 8px; background: var(--osq-border); border-radius: 99px; overflow: hidden; margin-bottom: 12px; }
.osq-progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--osq-primary), #6d8dff); transition: width .3s; border-radius: 99px; }
.osq-dots { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.osq-dot { width: 34px; height: 34px; padding: 0; border-radius: 8px; border: 1.5px solid var(--osq-border); background: #fff; color: var(--osq-muted); font: inherit; font-size: 13px; font-weight: 700; cursor: pointer; }
.osq-dot-done { background: var(--osq-primary-soft); border-color: #c7d2fe; color: var(--osq-primary-dark); }
.osq-dot-current { border-color: var(--osq-primary); background: var(--osq-primary); color: #fff; }
.osq-question { padding: 24px; min-height: 260px; }
.osq-qmeta { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.osq-qtitle { font-size: 20px; font-weight: 600; white-space: pre-wrap; margin-bottom: 16px; line-height: 1.45; }
.osq-qimg { display: block; max-width: 100%; max-height: 360px; border-radius: 10px; margin: 0 0 16px; }
.osq-options { display: flex; flex-direction: column; gap: 10px; }
.osq-choice { display: flex; align-items: center; gap: 12px; padding: 13px 16px; border: 2px solid var(--osq-border); border-radius: 12px; cursor: pointer; background: #fff; transition: border-color .12s, background .12s; font-size: 17px; }
.osq-choice:hover { border-color: #a5b4fc; background: #f8faff; }
.osq-choice input { position: absolute; opacity: 0; pointer-events: none; }
.osq-choice:focus-within { box-shadow: 0 0 0 3px rgba(47,91,234,.2); }
.osq-choice-letter { flex: none; width: 32px; height: 32px; border-radius: 50%; border: 2px solid var(--osq-border); display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--osq-muted); font-size: 15px; }
.osq-options[role=group] .osq-choice-letter { border-radius: 8px; }
.osq-choice-text { flex: 1; word-break: break-word; }
.osq-choice-on { border-color: var(--osq-primary); background: var(--osq-primary-soft); }
.osq-choice-on .osq-choice-letter { background: var(--osq-primary); border-color: var(--osq-primary); color: #fff; }
.osq-tf { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.osq-tf-btn { display: flex; flex-direction: column; align-items: center; gap: 6px; font: inherit; font-size: 18px; font-weight: 700; padding: 22px 12px; border: 2px solid var(--osq-border); border-radius: 14px; background: #fff; color: var(--osq-text); cursor: pointer; }
.osq-tf-btn:hover { border-color: #a5b4fc; }
.osq-tf-icon { font-size: 28px; }
.osq-tf-btn.osq-choice-on { border-color: var(--osq-primary); background: var(--osq-primary-soft); color: var(--osq-primary-dark); }
.osq-text-answer { font-size: 18px !important; min-height: 52px !important; }
.osq-num-answer { max-width: 260px; }
.osq-fill-text { font-size: 18px; line-height: 2.3; white-space: pre-wrap; }
.osq-app .osq-blank { display: inline-block; width: auto !important; min-height: 38px !important; padding: 4px 10px !important; margin: 0 3px; font-size: 17px !important; font-weight: 600;
  border: none !important; border-bottom: 2.5px solid #8b5cf6 !important; border-radius: 6px 6px 0 0 !important; background: #f5f3ff !important; vertical-align: baseline; }
.osq-match { display: flex; flex-direction: column; gap: 10px; }
.osq-match-row { display: grid; grid-template-columns: 1fr 24px 1.2fr; gap: 10px; align-items: center; padding: 10px 12px; border: 1.5px solid var(--osq-border); border-radius: 12px; }
.osq-match-done { border-color: #c7d2fe; background: #f8faff; }
.osq-match-left { font-weight: 600; word-break: break-word; }
.osq-order { list-style: none; margin: 0 0 12px; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.osq-order-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border: 1.5px solid var(--osq-border); border-radius: 12px; background: #fff; cursor: grab; user-select: none; }
.osq-order-item:active { cursor: grabbing; }
.osq-order-handle { color: #cbd5e1; font-weight: 700; letter-spacing: -2px; }
.osq-order-text { flex: 1; font-size: 16px; word-break: break-word; }
.osq-order-btns { display: flex; gap: 4px; }
.osq-dragging { opacity: .45; }
.osq-dragover { border-color: var(--osq-primary); background: var(--osq-primary-soft); }
.osq-player-nav { display: flex; gap: 8px; align-items: center; padding: 8px 0 4px; }

/* result */
.osq-result { text-align: center; padding: 28px; }
.osq-score { display: flex; justify-content: center; align-items: center; gap: 20px; margin-top: 8px; }
.osq-score-ring { --p: 0; width: 110px; height: 110px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: conic-gradient(var(--osq-primary) calc(var(--p) * 1%), var(--osq-border) 0); position: relative; }
.osq-score-ring::before { content: ""; position: absolute; inset: 10px; background: #fff; border-radius: 50%; }
.osq-score-ring span { position: relative; font-size: 26px; font-weight: 800; }
.osq-score-num { font-size: 26px; }
.osq-review { border-left: 4px solid var(--osq-skip); padding: 16px 18px; }
.osq-review.osq-st-correct { border-left-color: var(--osq-good); }
.osq-review.osq-st-partial { border-left-color: var(--osq-mid); }
.osq-review.osq-st-wrong { border-left-color: var(--osq-bad); }
.osq-review-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 6px; margin-bottom: 8px; font-size: 14px; }
.osq-review-q { font-weight: 600; white-space: pre-wrap; margin-bottom: 8px; }
.osq-review-line { font-size: 15px; margin-top: 4px; }
.osq-correct-text { color: #166534; font-weight: 600; }
.osq-explain { margin-top: 10px; background: #fffbeb; border-radius: 8px; padding: 8px 12px; font-size: 14px; white-space: pre-wrap; }

/* dashboard */
.osq-vis { font-size: 12.5px; font-weight: 600; padding: 3px 10px; border-radius: 999px; background: var(--osq-skip-soft); color: #475569; }
.osq-vis-pending { background: var(--osq-mid-soft); color: #92400e; }
.osq-vis-public { background: var(--osq-good-soft); color: #166534; }
.osq-vis-rejected { background: var(--osq-bad-soft); color: #991b1b; }
.osq-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
.osq-stat { background: var(--osq-card); border: 1px solid var(--osq-border); border-radius: var(--osq-radius); padding: 14px 16px; box-shadow: var(--osq-shadow); }
.osq-stat strong { display: block; font-size: 24px; line-height: 1.2; }
.osq-stat span { font-size: 13px; color: var(--osq-muted); }
.osq-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 14px; }
.osq-tabs { display: flex; flex-wrap: wrap; gap: 4px; background: var(--osq-skip-soft); padding: 4px; border-radius: 12px; }
.osq-tab { font: inherit; font-size: 14px; font-weight: 600; border: none; background: transparent; color: var(--osq-muted); padding: 8px 14px; border-radius: 9px; cursor: pointer; }
.osq-tab-on { background: #fff; color: var(--osq-text); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.osq-list-controls { margin-bottom: 10px; }
.osq-list-controls input { max-width: 280px; }
.osq-list-controls select { width: auto !important; }
.osq-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; font-size: 13px; margin-bottom: 10px; }
.osq-legend-item { display: inline-flex; align-items: center; gap: 5px; }
.osq-legend-sw { display: inline-flex; width: 20px; height: 20px; border-radius: 5px; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; }
.osq-table-wrap { overflow-x: auto; border: 1px solid var(--osq-border); border-radius: var(--osq-radius); background: #fff; -webkit-overflow-scrolling: touch; }
.osq-app table { border-collapse: collapse; width: 100%; margin: 0; font-size: 14px; }
.osq-app th, .osq-app td { padding: 8px 10px; border-bottom: 1px solid var(--osq-border); text-align: left; vertical-align: top; }
.osq-app th { background: var(--osq-bg); font-weight: 700; font-size: 13px; white-space: nowrap; }
.osq-matrix th, .osq-matrix td { text-align: center; vertical-align: middle; white-space: nowrap; }
.osq-matrix th small { display: block; font-weight: 700; }
.osq-matrix .osq-sticky { position: sticky; left: 0; z-index: 1; background: #fff; text-align: left; min-width: 150px; box-shadow: 1px 0 0 var(--osq-border); }
.osq-matrix th.osq-sticky { background: var(--osq-bg); }
.osq-cell { padding: 4px 6px !important; min-width: 52px; }
.osq-cell span { display: block; font-weight: 800; font-size: 15px; line-height: 1.1; }
.osq-cell small { display: block; font-size: 11px; opacity: .8; }
.osq-cell-correct { background: var(--osq-good-soft) !important; color: #166534; }
.osq-cell-partial { background: var(--osq-mid-soft) !important; color: #92400e; }
.osq-cell-wrong { background: var(--osq-bad-soft) !important; color: #991b1b; }
.osq-cell-skipped { background: var(--osq-skip-soft) !important; color: #64748b; }
.osq-cell-none { color: #cbd5e1; }
.osq-foot td { background: var(--osq-bg); font-weight: 600; font-size: 12.5px; color: var(--osq-muted); }
.osq-late { color: var(--osq-mid); font-weight: 700; font-size: 13px; }
.osq-student { padding: 0; overflow: hidden; }
.osq-student summary { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding: 14px 18px; cursor: pointer; list-style: none; }
.osq-student summary::-webkit-details-marker { display: none; }
.osq-student summary::before { content: "▸"; color: var(--osq-muted); margin-right: 2px; transition: transform .15s; }
.osq-student[open] summary::before { transform: rotate(90deg); }
.osq-student-name { flex: 1; min-width: 160px; }
.osq-student-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; font-size: 14px; }
.osq-student .osq-table-wrap { border: none; border-top: 1px solid var(--osq-border); border-radius: 0; }
.osq-detail td:nth-child(2) { min-width: 200px; }
.osq-detail td:nth-child(3), .osq-detail td:nth-child(4) { min-width: 140px; }
.osq-row-wrong td:first-child, .osq-row-skipped td:first-child { box-shadow: inset 3px 0 0 var(--osq-bad); }
.osq-row-correct td:first-child { box-shadow: inset 3px 0 0 var(--osq-good); }
.osq-row-partial td:first-child { box-shadow: inset 3px 0 0 var(--osq-mid); }
.osq-qstat-main { display: flex; align-items: center; gap: 18px; margin: 8px 0; }
.osq-big-pct { font-size: 34px; font-weight: 800; min-width: 90px; }
.osq-stackbar { display: flex; height: 22px; border-radius: 6px; overflow: hidden; background: var(--osq-skip-soft); margin: 6px 0; }
.osq-stackbar span { display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; min-width: 18px; }
.osq-dist { margin-top: 12px; border-top: 1px dashed var(--osq-border); padding-top: 10px; }
.osq-dist-row { display: grid; grid-template-columns: minmax(120px, 1.2fr) 2fr 90px; gap: 10px; align-items: center; font-size: 14px; margin: 6px 0; }
.osq-dist-label { word-break: break-word; }
.osq-dist-bar { height: 12px; background: var(--osq-skip-soft); border-radius: 99px; overflow: hidden; }
.osq-dist-bar span { display: block; height: 100%; background: #94a3b8; border-radius: 99px; }
.osq-dist-correct .osq-dist-label { font-weight: 700; color: #166534; }
.osq-dist-correct .osq-dist-bar span { background: var(--osq-good); }
.osq-dist-num { text-align: right; color: var(--osq-muted); font-size: 13px; }
.osq-manage .osq-row { margin-top: 6px; }

/* public list */
.osq-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.osq-list-item { display: block; text-decoration: none !important; color: var(--osq-text) !important; transition: transform .12s, box-shadow .12s; margin: 0; }
.osq-list-item:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(15,23,42,.1); }
.osq-list-item h3 { color: var(--osq-primary-dark); }
.osq-list-item p { color: var(--osq-muted); font-size: 14px; }

/* responsive */
@media (max-width: 760px) {
  .osq-landing, .osq-grid2 { grid-template-columns: 1fr; }
  .osq-stats { grid-template-columns: 1fr 1fr; }
  .osq-addbtns { grid-template-columns: 1fr 1fr; }
  .osq-card { padding: 16px; }
  .osq-question { padding: 18px; }
  .osq-qtitle { font-size: 18px; }
  .osq-match-row { grid-template-columns: 1fr; gap: 6px; }
  .osq-match-row .osq-pair-arrow { display: none; }
  .osq-pair { grid-template-columns: 1fr 34px; }
  .osq-pair .osq-pair-arrow { display: none; }
  .osq-pair > input:nth-of-type(2) { grid-column: 1; }
  .osq-pair-head { display: none; }
  .osq-type-hint { margin-left: 0; }
  .osq-qtools { margin-left: 0; }
  .osq-dist-row { grid-template-columns: 1fr 80px; }
  .osq-dist-bar { grid-column: 1 / -1; grid-row: 2; }
  .osq-player-nav .osq-btn { padding: 10px 12px; }
  .osq-share-code strong { font-size: 30px; }
}
@media (max-width: 420px) {
  .osq-addbtns { grid-template-columns: 1fr; }
  .osq-tf { grid-template-columns: 1fr; }
  .osq-hero .osq-row { flex-wrap: wrap; }
  .osq-hero .osq-row .osq-btn { width: 100%; }
}