:root{--font: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Text", "Segoe UI", Inter, system-ui, "Noto Sans", Arial, sans-serif;--bg: #f7f5f9;--surface: #ffffff;--surface-2: #f2eef6;--border: #e4dee9;--border-strong: #cec6da;--text: #2a2833;--text-muted: #5d5869;--primary: #45689c;--primary-hover: #375382;--primary-soft: #e5ecf7;--primary-line: #c3d4ec;--primary-ink: #2f4c76;--accent: #a9546f;--accent-hover: #8a4259;--accent-soft: #fbe7ec;--accent-line: #f1c9d5;--accent-ink: #8a4259;--success: #3f7355;--success-soft: #e2eee6;--success-line: #bedbc7;--success-ink: #2f5c42;--warning: #845518;--warning-soft: #fbeeda;--warning-line: #eed5ae;--danger: #a53d31;--danger-hover: #8b3127;--danger-soft: #fae3df;--danger-line: #f0c2bb;--info-soft: #e5ecf7;--info-line: #c3d4ec;--focus: #b45309;--radius-sm: 8px;--radius: 12px;--radius-lg: 18px;--radius-full: 999px;--shadow-sm: 0 1px 2px rgb(42 40 51 / 5%);--shadow: 0 1px 2px rgb(42 40 51 / 4%), 0 4px 12px -2px rgb(42 40 51 / 7%);--shadow-lg: 0 16px 40px -12px rgb(42 40 51 / 18%);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;color-scheme:light}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font);font-size:16px;line-height:1.55;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}h1,h2,h3{line-height:1.2;letter-spacing:-.015em;margin:0 0 var(--space-3)}h1{font-size:1.7rem;font-weight:700;letter-spacing:-.02em}h2{font-size:1.2rem;font-weight:650}h3{font-size:1.02rem;font-weight:650}p{margin:0 0 var(--space-3)}a{color:var(--primary);text-decoration-thickness:1px;text-underline-offset:2px}a:hover{color:var(--primary-hover)}code,kbd{font-family:ui-monospace,SF Mono,Cascadia Code,Consolas,monospace;font-size:.9em}:focus-visible{outline:2.5px solid 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24px))}.modal::backdrop{background:#2a283370;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--surface);z-index:1}.modal-header h2{margin:0}.modal-body{padding:var(--space-5)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--space-2);padding:var(--space-4) var(--space-5);border-top:1px solid var(--border);position:sticky;bottom:0;background:var(--surface);flex-wrap:wrap}.auth-page{min-height:100vh;display:grid;place-items:center;padding:var(--space-4);background:radial-gradient(ellipse 70% 55% at 12% 8%,var(--accent-soft),transparent 70%),radial-gradient(ellipse 60% 50% at 88% 18%,var(--primary-soft),transparent 70%),radial-gradient(ellipse 75% 60% at 78% 95%,var(--success-soft),transparent 70%),var(--bg)}.auth-card{width:min(440px,100%);background:var(--surface);border:1px 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var(--primary-line);background:var(--primary-soft);border-radius:var(--radius-lg);padding:var(--space-5);text-align:center;margin-bottom:var(--space-3)}.preview-prompt{font-size:1.9rem;font-weight:700;letter-spacing:-.01em;text-transform:uppercase;color:var(--primary-ink)}.preview-answer{font-size:1.2rem;color:var(--success-ink);font-weight:650}.bulk-result{margin-top:var(--space-4)}.shell,.main{min-width:0}@media(pointer:coarse){.btn-sm{min-height:44px;padding:8px 14px}}@media(max-width:900px){.main{padding-left:max(var(--space-4),env(safe-area-inset-left));padding-right:max(var(--space-4),env(safe-area-inset-right));padding-bottom:max(var(--space-6),env(safe-area-inset-bottom))}.card{padding:var(--space-4);margin-bottom:var(--space-4)}.page-actions{width:100%}.page-actions .btn{flex:1 1 auto}.filters{gap:var(--space-2) var(--space-4)}.topbar .brand{min-width:0;overflow:hidden}.topbar-user{max-width:42%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.assignment-row{grid-template-columns:1fr;align-items:stretch}.assignment-row .btn{margin-bottom:var(--space-4)}.wizard-footer{flex-wrap:wrap}.count-picker{justify-content:center}.count-input{width:100%;max-width:150px}.pagination{justify-content:center;text-align:center}.modal,.modal-wide{width:100%;max-width:none;max-height:88dvh;margin:0;position:fixed;inset:auto 0 0;border-radius:var(--radius-lg) var(--radius-lg) 0 0;padding-bottom:env(safe-area-inset-bottom)}}@media(max-width:720px){.table-wrap{overflow-x:visible}.table,.table tbody,.table tr,.table td{display:block;width:100%}.table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.table tbody tr{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);padding:var(--space-2) var(--space-3);margin-bottom:var(--space-3)}.table tbody tr:last-child{margin-bottom:0}.table tbody tr:hover{background:var(--surface)}.table tbody tr.row-error{border-color:var(--danger-line);background:var(--danger-soft)}.table td,.table tbody tr:last-child td{border-bottom:1px solid var(--border);padding:var(--space-2) 0;overflow-wrap:anywhere}.table td[data-label]{display:block}.table td[data-label]:before{content:attr(data-label);display:block;margin-bottom:2px;font-size:.68rem;font-weight:650;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted)}.table td:last-child{border-bottom:0}.table td.row-actions{display:flex;flex-wrap:wrap;gap:var(--space-2);width:auto;max-width:none;white-space:normal;text-align:left;vertical-align:baseline;padding-top:var(--space-3)}.table td.row-actions>*{margin:0}.table td.row-actions .btn{flex:1 1 auto}.table-compact td,.table-compact th{padding:var(--space-2) 0}.assignment-line{white-space:normal}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.board-code{display:grid;justify-items:center;gap:var(--space-3);text-align:center}.board-code-steps{margin:0;color:var(--text-muted)}.board-code-value{font-family:ui-monospace,SF Mono,Consolas,monospace;font-size:clamp(2.6rem,11vw,4.2rem);font-weight:800;letter-spacing:.14em;text-indent:.14em;line-height:1.1;color:var(--primary-ink);background:var(--primary-soft);border:1px solid var(--primary-line);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-5);width:100%;overflow-wrap:anywhere}.code-input{font-family:ui-monospace,SF Mono,Consolas,monospace;font-size:1.8rem;font-weight:700;letter-spacing:.18em;text-align:center;text-transform:uppercase;min-height:60px}.play-page{min-height:100vh;background:var(--bg)}.duel{--duel-bg: var(--bg);--duel-surface: var(--surface);--duel-border: var(--border);--duel-text: var(--text);--duel-muted: var(--text-muted);--left: var(--accent);--left-soft: var(--accent-soft);--left-line: var(--accent-line);--left-ink: var(--accent-ink);--right: var(--primary);--right-soft: var(--primary-soft);--right-line: var(--primary-line);--right-ink: var(--primary-ink);--good: var(--success);--good-soft: var(--success-soft);--good-line: var(--success-line);--good-ink: var(--success-ink);--tried-soft: #f1eef2;--tried-text: #817a8a;min-height:100vh;display:flex;flex-direction:column;background:var(--duel-bg);color:var(--duel-text);padding:clamp(8px,1.5vw,20px);gap:clamp(8px,1.2vw,16px);user-select:none;-webkit-user-select:none}.duel-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.duel-progress{font-size:clamp(1.05rem,1.8vw,1.4rem);font-weight:700;color:var(--duel-muted);background:var(--duel-surface);border:1px solid var(--duel-border);padding:6px 16px;border-radius:999px}.duel-controls{display:flex;gap:8px;flex-wrap:wrap}.duel-controls .btn{border-color:var(--duel-border);color:var(--duel-text);font-weight:600}.duel-controls .btn-primary{background:var(--good);border-color:var(--good);color:#fff}.duel-controls .btn-primary:hover:not(:disabled){background:var(--good-ink);border-color:var(--good-ink)}.duel-controls .btn-danger{color:var(--danger)}.duel-banner{display:flex;gap:12px;align-items:center;padding:10px 16px;border-radius:var(--radius);font-weight:600;background:var(--warning-soft);border:1px solid var(--warning-line);color:var(--warning)}.duel-banner.failed{background:var(--danger-soft);border-color:var(--danger-line);color:var(--danger)}.duel-notice{position:fixed;left:50%;top:72px;transform:translate(-50%);background:var(--duel-surface);color:var(--duel-text);border:1px solid var(--duel-border);padding:10px 20px;border-radius:var(--radius-full);font-weight:600;z-index:50;box-shadow:var(--shadow-lg)}.duel-arena{position:relative;flex:1;display:grid;grid-template-columns:1fr minmax(260px,1.1fr) 1fr;gap:clamp(8px,1.5vw,24px);min-height:0}.duel-center{container-type:inline-size;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:16px;padding:16px;background:var(--duel-surface);border-radius:24px;border:1px solid var(--duel-border);box-shadow:var(--shadow)}.duel-prompt{font-size:clamp(1.6rem,11cqi,5rem);font-weight:800;line-height:1.1;text-transform:uppercase;letter-spacing:.01em;overflow-wrap:break-word;max-width:100%;margin:0;color:var(--duel-text)}.duel-feedback{font-size:clamp(1.05rem,2vw,1.6rem);font-weight:700;padding:10px 18px;border-radius:14px;margin:0;animation:fade-in .3s ease-out}.feedback-correct{background:var(--good-soft);color:var(--good-ink)}.duel-reveal{display:grid;justify-items:center;gap:10px;animation:fade-in .3s ease-out}.duel-reveal p{margin:0;font-size:clamp(1.05rem,2vw,1.5rem);font-weight:700;color:var(--duel-muted)}.feedback-revealed{background:var(--surface-2);color:var(--text-muted)}.duel-keys-hint{font-size:.85rem;color:var(--duel-muted);margin:0}.countdown p{font-size:clamp(1.3rem,2.6vw,2rem);font-weight:700;color:var(--duel-muted);margin:0}.countdown-number{display:block;font-size:clamp(5rem,14vw,10rem);font-weight:800;line-height:1;color:var(--warning);animation:fade-in .4s ease-out}.player{display:flex;flex-direction:column;gap:clamp(6px,1vw,12px);padding:clamp(10px,1.4vw,18px);border-radius:24px;border:1px solid var(--duel-border);min-width:0;transition:box-shadow .25s ease}.player-left{background:var(--left-soft);border-color:var(--left-line)}.player-right{background:var(--right-soft);border-color:var(--right-line)}.player-winner{box-shadow:0 0 0 4px var(--good-line)}.player-header{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 6px 6px 12px}.player-name{font-size:clamp(1.15rem,2.2vw,1.8rem);font-weight:800;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.player-left .player-name{color:var(--left-ink)}.player-right .player-name{color:var(--right-ink)}.player-score{font-size:clamp(1.5rem,3vw,2.4rem);font-weight:800;background:var(--duel-surface);border:1px solid var(--duel-border);border-radius:14px;padding:0 14px;min-width:2.4em;text-align:center;font-variant-numeric:tabular-nums}.player-status{min-height:1.6em;margin:0;font-weight:600;font-size:clamp(.95rem,1.5vw,1.15rem);text-align:center;color:var(--duel-muted)}.player-winner .player-status{color:var(--good)}.options{display:grid;gap:clamp(6px,1vw,12px);flex:1;grid-auto-rows:minmax(56px,1fr)}.option{display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;align-items:center;align-content:center;column-gap:12px;text-align:left;font:inherit;font-size:clamp(1.2rem,2.3vw,1.9rem);font-weight:700;padding:8px 16px;border-radius:16px;border:1.5px solid var(--duel-border);background:var(--duel-surface);color:var(--duel-text);cursor:pointer;touch-action:manipulation;transition:transform .08s ease,background-color .2s ease,border-color .2s ease,opacity .2s ease;min-height:56px}.option:active:not(:disabled){transform:scale(.98)}.player-left .option-idle:hover{border-color:var(--left-line);background:var(--left-soft)}.player-right .option-idle:hover{border-color:var(--right-line);background:var(--right-soft)}.option-key{grid-row:span 2;align-self:center;display:grid;place-items:center;width:1.8em;height:1.8em;border-radius:10px;font-size:.6em;font-weight:800}.player-left .option-key{background:var(--left-soft);color:var(--left-ink);border:1px solid var(--left-line)}.player-right .option-key{background:var(--right-soft);color:var(--right-ink);border:1px solid var(--right-line)}.option-text{overflow-wrap:anywhere}.option-mark{font-size:.55em;font-weight:700}.options-concealed .option-text{visibility:hidden}.option:disabled{cursor:default}.option-idle-locked{opacity:.6}.option-tried{background:var(--tried-soft);color:var(--tried-text);border-color:transparent}.option-tried .option-key{opacity:.5}.option-correct{background:var(--good-soft);border-color:var(--good-line);color:var(--good-ink);opacity:1;animation:fade-in .3s ease-out}.player .option-correct .option-key{background:var(--good);border-color:var(--good);color:#fff}.duel-overlay{position:absolute;inset:0;display:grid;place-content:center;justify-items:center;gap:16px;background:#f7f5f9e0;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);border-radius:24px;font-size:clamp(1.5rem,3.6vw,2.6rem);font-weight:800;color:var(--duel-text);z-index:10}.rotate-hint{display:none;margin:0;text-align:center;background:var(--warning-soft);border:1px solid var(--warning-line);color:var(--warning);padding:8px;border-radius:var(--radius);font-weight:600}@media(orientation:portrait)and (max-width:900px){.rotate-hint{display:block;order:-1}}@media(max-width:760px){.duel-arena{grid-template-columns:1fr 1fr;grid-template-areas:"center center" "left right"}.duel-center{grid-area:center}.player-left{grid-area:left}.player-right{grid-area:right}.duel-keys-hint{display:none}}.duel-result{align-items:center;justify-content:center}.result-card{background:var(--duel-surface);color:var(--duel-text);border:1px solid var(--duel-border);border-radius:28px;padding:clamp(24px,4vw,48px);width:min(640px,100%);text-align:center;box-shadow:var(--shadow-lg);animation:fade-in .4s ease-out}.result-emoji{font-size:4rem;margin:0}.result-headline{font-size:clamp(1.5rem,3.6vw,2.3rem);font-weight:800}.result-scores{list-style:none;padding:0;margin:0 0 24px;display:grid;gap:10px}.result-scores li{display:flex;justify-content:space-between;font-size:1.3rem;font-weight:600;padding:12px 18px;border-radius:14px;background:var(--surface-2);font-variant-numeric:tabular-nums}.result-scores li.result-winner{background:var(--good-soft);outline:1.5px solid var(--good-line);color:var(--good-ink)}.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}@keyframes fade-in{0%{transform:scale(.96);opacity:.3}to{transform:scale(1);opacity:1}}@media(prefers-reduced-motion:reduce){.option,.duel-feedback,.countdown-number,.result-card,.option-correct{animation:none!important;transition:none!important}}