:root{--primary: #76b82a;--primary-dark: #5e9421;--red: #e25555;--ink: #243018;--muted: #6b7563;--bg: #f7f9f4;--card: #ffffff;--chip: #f1f3ee;--shadow: 0 1px 2px rgba(60, 64, 67, .3), 0 2px 6px 2px rgba(60, 64, 67, .15);--radius: 14px}[data-theme=dark]{--ink: #e8ede3;--muted: #9aa694;--bg: #14180f;--card: #1f2618;--chip: #2b3520;--shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 2px 6px 2px rgba(0, 0, 0, .3)}html{background:var(--bg)}:root{color-scheme:light}[data-theme=dark]{color-scheme:dark}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh}#root{display:flex;flex-direction:column}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--ink)}.pointer{cursor:pointer}.underline{text-decoration:underline}.muted{color:var(--muted)}a{color:inherit;text-decoration:none}.nav{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;background:var(--card);box-shadow:0 1px 3px #3c404326;position:sticky;top:0;z-index:50}.brand{display:flex;align-items:center;gap:10px;font-size:1.3rem;font-weight:700}.nav nav{display:flex;gap:6px}.nav nav a{padding:8px 16px;border-radius:999px;font-weight:600;color:var(--muted)}.nav nav a:hover{background:var(--chip)}.nav nav a.active{background:var(--primary);color:#fff}.hero{text-align:center;padding:48px 20px 36px;max-width:640px;margin:0 auto;overflow:hidden;max-height:700px;transition:max-height .45s ease,opacity .3s ease,padding .45s ease}.hero.closing{max-height:0;opacity:0;padding-top:0;padding-bottom:0}.hero-reopen{display:block;margin:16px auto 0;border:none;background:none;color:var(--muted);font-family:inherit;font-size:.9rem;font-weight:600;cursor:pointer}.hero-reopen:hover{text-decoration:underline;color:var(--ink)}.hero h1{font-size:clamp(1.8rem,5vw,2.6rem);margin:0 0 10px}.tagline{font-size:1.1rem;color:var(--muted);margin:0 0 18px}.value-props{list-style:none;padding:0;margin:0 0 26px;display:flex;flex-direction:column;gap:8px;font-size:1.05rem}.btn{display:inline-block;border:none;border-radius:999px;padding:10px 22px;font-size:1rem;font-weight:600;background:var(--chip);color:var(--ink);cursor:pointer}.btn:hover{filter:brightness(.96)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);filter:none}.btn-big{font-size:1.2rem;padding:14px 34px}.chip{background:var(--chip);border-radius:999px;padding:10px 18px;font-size:.95rem;white-space:nowrap}.chip-red{background:#f2a1a1;color:#243018;font-weight:600}.icon-btn{border:none;background:none;font-size:1.4rem;cursor:pointer;line-height:1}.app{flex:1;width:100%;max-width:760px;margin:0 auto;padding:24px 16px 60px;display:flex;flex-direction:column;gap:16px}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.practice-card{position:relative;text-align:center;padding:16px 16px 28px}.card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:22px}.settings-btn{flex-shrink:0}.pause-chip{position:absolute;top:12px;left:50%;transform:translate(-50%);z-index:5}.question{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:.35em;font-size:clamp(2.4rem,9vw,4.6rem);font-weight:700;font-variant-numeric:tabular-nums}.question .op{color:var(--muted);font-weight:600}.question .prompt{white-space:nowrap}.chip-row{display:flex;gap:6px;flex-wrap:wrap}.mode-chip{border:none;font-weight:600;cursor:pointer;font-family:inherit;color:var(--ink)}.mode-chip:hover{filter:brightness(.96)}.mode-chip:disabled{cursor:default;opacity:.8}.game-status{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;min-height:0;margin:0 0 14px}.game-status:empty{margin:0}.timer-chip{font-weight:700;font-variant-numeric:tabular-nums}.timer-chip.urgent{background:#f2a1a1;color:#243018}.mode-picker h2{text-align:center}.mode-category{font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:16px 0 8px}.mode-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}.mode-card{display:flex;flex-direction:column;align-items:flex-start;gap:2px;border:2px solid var(--chip);border-radius:12px;background:var(--card);color:var(--ink);padding:10px 12px;cursor:pointer;font-family:inherit;text-align:left}.mode-card:hover{border-color:var(--primary)}.mode-card.active{border-color:var(--primary);background:var(--chip)}.mode-icon{font-size:1.2rem;font-weight:700}.mode-label{font-weight:700;font-size:.95rem}.mode-hint{font-size:.78rem;color:var(--muted)}.choice-row{display:flex;justify-content:center;gap:14px;margin-top:18px;flex-wrap:wrap}.btn-choice{font-size:1.5rem;padding:16px 36px;font-variant-numeric:tabular-nums}.btn-choice:disabled{opacity:.6;cursor:default}.question input{width:4.2ch;background:var(--card);font-size:inherit;font-weight:inherit;font-family:inherit;text-align:center;border:3px solid var(--chip);border-radius:12px;color:var(--ink);padding:0 .1em}.question input:focus{outline:none;border-color:var(--primary)}.answer-wrap{display:inline-flex;align-items:center;gap:.25em;flex-shrink:0}.submit-btn{font-size:.45em;line-height:1;padding:.55em .7em;border-radius:14px}.submit-btn:disabled{opacity:.45;cursor:default}input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}input[type=number]{-moz-appearance:textfield;-webkit-appearance:textfield;appearance:textfield}.feedback{min-height:2.2em;font-size:1.4rem;font-weight:600;margin-top:14px}.ok{color:#2e8b22}.bad{color:var(--red)}.stats{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:10px}.panel h2{margin:0 0 14px;font-size:1.2rem}.panel label{display:block;margin:10px 0}.range-label{font-weight:600;margin:18px 0 8px}.range-row{display:flex;flex-wrap:wrap;gap:6px}.range-chip{border:none;cursor:pointer;font-family:inherit;font-weight:600;color:var(--ink)}.range-chip .range-hint{font-weight:400;color:var(--muted);font-size:.85em}.range-chip.active{background:var(--primary);color:#fff}.range-chip.active .range-hint{color:#ffffffd9}.custom-range{display:flex;gap:16px;margin-top:10px}.custom-range label{margin:0}.num-small{width:80px;padding:6px;border:1px solid var(--chip);border-radius:8px;background:var(--card);color:var(--ink)}.panel-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;justify-content:center}.report{max-height:420px;overflow-y:auto;font-variant-numeric:tabular-nums;line-height:1.9}.report .close-btn{float:right;border:none;background:var(--chip);border-radius:8px;padding:2px 8px;cursor:pointer}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#24301873;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.results{text-align:center;max-width:460px;width:100%}.results h2{margin:0 0 12px}.res-score{font-size:3rem;font-weight:800;font-variant-numeric:tabular-nums}.res-line{color:var(--muted);margin:6px 0 12px}.badge{display:inline-block;background:var(--chip);border-radius:999px;padding:8px 18px;font-weight:700;margin-bottom:8px}.res-best{font-weight:600;margin-bottom:6px}.page{flex:1;width:100%;max-width:680px;margin:0 auto;padding:40px 16px 60px;line-height:1.7}.page h1{font-size:1.9rem;margin-top:0}.page h2{font-size:1.25rem;margin-top:28px}.page ul{line-height:1.9}.soon{display:inline-block;background:#ffe9a8;color:#243018;border-radius:999px;padding:4px 14px;font-size:.9rem;font-weight:700;vertical-align:middle;margin-left:8px}.about-story{display:flex;gap:20px;align-items:flex-start;flex-wrap:wrap}.about-photo{width:150px;height:auto;border-radius:var(--radius);box-shadow:var(--shadow)}.about-story p{flex:1;min-width:240px;margin-top:0}.contact-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:22px 0}.contact-card{text-align:center}.contact-card h2{margin-top:0;font-size:1.1rem}.chip-review{background:#ffe9a8;color:#243018;font-weight:600}.icon-row{display:flex;gap:6px;flex-shrink:0;align-items:center}.profile-btn{display:flex;align-items:center;gap:6px;border:none;background:none;font-size:1.4rem;cursor:pointer;font-family:inherit;color:var(--ink);line-height:1;padding:0}.profile-btn.signed{background:var(--chip);border-radius:999px;padding:5px 12px 5px 8px;font-size:.95rem}.profile-btn .avatar{font-size:1.2rem}.profile-name{font-weight:600;max-width:96px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.avatar-big{font-size:1.6rem}.avatar-row{display:flex;flex-wrap:wrap;gap:6px;max-height:168px;overflow-y:auto;padding:4px;border:1px solid var(--chip);border-radius:12px}.avatar-pick{font-size:1.4rem;background:var(--chip);border:2px solid transparent;border-radius:10px;padding:4px 8px;cursor:pointer;line-height:1.3}.avatar-pick.active{border-color:var(--primary)}.sync-input{width:180px;padding:8px 10px;border:1px solid var(--chip);border-radius:8px;background:var(--card);color:var(--ink);font-family:inherit}.sync-input.pin{width:80px;letter-spacing:.3em}.sync-input.wide{width:min(320px,100%)}.sync-input.code-input{width:140px;font-size:1.3rem}.ok-note{color:#2e8b22;font-weight:600}.classroom{max-width:920px}.classroom-head{display:flex;justify-content:space-between;align-items:center;padding:4px 4px 0}.classroom-grid{display:grid;grid-template-columns:1fr 280px;gap:16px;align-items:start}@media(max-width:700px){.classroom-grid{grid-template-columns:1fr}}.session-mini{font-size:.85rem;margin-bottom:6px}.waiting{text-align:center;padding:20px 10px}.waiting-emoji{font-size:2.6rem}.leaderboard h2{margin:0 0 10px;font-size:1.1rem}.lb-list{list-style:none;margin:0;padding:0}.lb-row{display:grid;grid-template-columns:28px 1fr auto auto;gap:8px;align-items:center;padding:7px 8px;border-radius:8px;font-variant-numeric:tabular-nums}.lb-row.me{background:var(--chip);font-weight:700}.lb-rank{text-align:center}.lb-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lb-score{font-weight:700;color:var(--primary-dark)}.lb-meta{color:var(--muted);font-size:.85rem;min-width:38px;text-align:right}.page .panel{margin-bottom:16px}.page .panel:last-child{margin-bottom:0}.class-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.class-head h2{margin:0 0 2px;font-size:1.15rem}.join-code{font-family:ui-monospace,Menlo,monospace;font-size:1.3rem;font-weight:700;letter-spacing:.15em;background:var(--chip);padding:6px 12px;border-radius:10px;flex-shrink:0}.class-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:14px}.wide-select{width:auto;min-width:150px}.roster{margin-top:14px}.roster-table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}.roster-table th,.roster-table td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--chip)}.roster-table th{color:var(--muted);font-size:.8rem;font-weight:700}.link-btn{border:none;background:none;color:var(--primary-dark);cursor:pointer;font-size:.85rem;text-decoration:underline;font-family:inherit}.friends-btn{align-self:center;background:#ffe9a8;color:#243018;font-weight:700}.field-note{font-size:.85rem;margin:-4px 0 8px}.lobby .share-box{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:12px 0}.big-code{font-family:ui-monospace,Menlo,monospace;font-size:2rem;font-weight:800;letter-spacing:.2em;background:var(--chip);padding:10px 20px;border-radius:12px}.h2h-banner{min-height:1.6em;font-weight:700;font-size:1.1rem;margin-bottom:10px}.end-btn{margin-top:12px;width:100%}.podium{text-align:center}.podium-row{display:flex;justify-content:center;align-items:flex-end;gap:14px;margin:20px 0}.podium-spot{background:var(--chip);border-radius:12px;padding:14px 18px;min-width:84px}.podium-spot.p1{transform:translateY(-12px);background:#fff4cc;color:#243018}.podium-medal{font-size:1.8rem}.podium-name{font-weight:700;margin-top:4px;overflow:hidden;text-overflow:ellipsis}.podium-score{font-size:1.4rem;font-weight:800;color:var(--primary-dark)}.standings{margin:0 auto 12px;max-width:320px;text-align:left}.field-hint{color:var(--red);font-size:.85rem;margin-left:8px}.btn-danger{background:#f2a1a1;color:#243018}.sync-error{color:var(--red);font-weight:600}.dashboard{margin-top:20px}.dashboard .stats{justify-content:flex-start}.spark-label{font-size:.85rem;margin:12px 0 4px}.sparkline{width:100%;height:48px;background:var(--chip);border-radius:8px}.privacy-note{font-size:.85rem;margin-top:18px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:var(--ink);color:var(--bg);padding:12px 22px;border-radius:999px;font-weight:600;box-shadow:var(--shadow);z-index:200;white-space:nowrap}.footer{text-align:center;color:var(--muted);font-size:.9rem;padding:18px 10px 26px;line-height:1.8}.footer-links{display:flex;justify-content:center;gap:18px;font-weight:600;margin-bottom:4px}.footer a:hover{text-decoration:underline}@media(max-width:480px){.nav{padding:8px 10px}.nav nav a{padding:7px 10px}.brand span{display:none}.card{padding:18px}.practice-card{padding:12px 12px 20px}}