:root{--color-bg:#2e3440;--color-surface:#3b4252;--color-surface-hover:#424c60;--color-surface-active:#3a4a5c;--color-border:#434c5e;--color-border-strong:#4c566a;--color-primary:#5e81ac;--color-primary-hover:#6d90bb;--color-primary-light:#81a1c1;--color-accent:#88c0d0;--color-text:#d8dee9;--color-text-bright:#eceff4;--color-text-secondary:#9fadbf;--color-text-muted:#93a0b3;--color-success:#a3be8c;--color-danger:#bf616a}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{overflow-y:scroll}body{background:var(--color-bg);color:var(--color-text);min-height:100dvh;font-family:Hiragino Sans,Meiryo,sans-serif}:focus-visible{outline-offset:2px;outline:2px solid #88c0d0}button,[role=button]{touch-action:manipulation}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}#root{max-width:900px;margin:0 auto;padding:24px 16px}@media (width<=600px){#root{padding:14px 10px}}.app-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;gap:12px;margin:-24px -16px 28px;padding:14px 20px;display:flex}.app-header-title{color:var(--color-text-bright);white-space:nowrap;font-size:1.1rem;font-weight:700}.user-info{flex-shrink:0;align-items:center;gap:10px;display:flex}.user-avatar{object-fit:cover;border:2px solid var(--color-border-strong);border-radius:50%;width:32px;height:32px}.user-name{color:var(--color-text-secondary);text-overflow:ellipsis;white-space:nowrap;max-width:140px;font-size:.85rem;overflow:hidden}.btn-login{background:var(--color-primary);color:var(--color-text-bright);cursor:pointer;white-space:nowrap;border:none;border-radius:8px;padding:7px 14px;font-size:.85rem;font-weight:700;transition:background .15s}.btn-login:hover{background:var(--color-primary-hover)}.app-header-cta{background:var(--color-primary);color:var(--color-text-bright);white-space:nowrap;border-radius:8px;padding:7px 14px;font-size:.85rem;font-weight:700;text-decoration:none}.app-header-cta:hover{background:var(--color-primary-hover)}.btn-logout{border:1px solid var(--color-border-strong);color:var(--color-text-secondary);cursor:pointer;white-space:nowrap;background:0 0;border-radius:6px;padding:5px 12px;font-size:.8rem;transition:border-color .15s,color .15s}.btn-logout:hover{border-color:var(--color-danger);color:var(--color-danger)}.access-denied{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:80px 24px;display:flex}.access-denied-title{color:var(--color-text-bright);margin:0;font-size:1.2rem;font-weight:700}.access-denied-sub{color:var(--color-text-muted);margin:0;font-size:.9rem}.category-list{text-align:center}.toggle-rows{margin-bottom:24px}.random-toggle-row{justify-content:flex-end;align-items:center;gap:10px;margin-bottom:10px;display:flex}.toggle-rows .random-toggle-row:last-child{margin-bottom:0}.random-toggle-label{color:var(--color-text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;font-size:.9rem}.random-toggle{background:var(--color-border-strong);cursor:pointer;border:none;border-radius:13px;flex-shrink:0;width:48px;height:26px;padding:0;transition:background .2s;position:relative}.random-toggle--on{background:var(--color-primary)}.random-toggle-thumb{background:var(--color-text-bright);border-radius:50%;width:20px;height:20px;transition:left .2s;position:absolute;top:3px;left:3px;box-shadow:0 1px 3px #0000004d}.random-toggle--on .random-toggle-thumb{left:25px}.book-tabs{z-index:50;background:var(--color-bg);scrollbar-width:none;-webkit-overflow-scrolling:touch;gap:6px;margin-bottom:8px;padding:8px 0 12px;display:flex;position:sticky;top:0;overflow-x:auto}.book-tabs::-webkit-scrollbar{display:none}.book-tab{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-secondary);cursor:pointer;white-space:nowrap;border-radius:8px;flex-shrink:0;align-items:center;gap:7px;padding:8px 16px;font-size:.9rem;font-weight:700;transition:background .15s,border-color .15s,color .15s;display:inline-flex}@media (hover:hover){.book-tab:hover{border-color:var(--color-primary-light);color:#c8d0dc}}.book-tab--active{background:var(--color-surface-active);border-color:var(--color-primary);color:var(--color-accent)}.book-tab--locked{color:var(--color-text-muted);border-style:dashed}.book-tab-badge{background:var(--color-primary);min-width:18px;height:18px;color:var(--color-text-bright);font-variant-numeric:tabular-nums;border-radius:9px;justify-content:center;align-items:center;padding:0 5px;font-size:.75rem;font-weight:700;display:inline-flex}.book-content{animation:.15s fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.book-group{margin-bottom:40px}.book-label{color:#ebcb8b;text-align:left;border-bottom:1px solid var(--color-border);background:#ebcb8b14;border-left:3px solid #d4aa60;justify-content:space-between;align-items:center;margin:0 0 16px;padding:8px 16px;font-size:1.2rem;font-weight:700;display:flex}.book-label-toggle{cursor:pointer;-webkit-user-select:none;user-select:none;flex:1;align-items:center;gap:8px;display:flex}.book-label-chevron{color:#d4aa60;flex-shrink:0;font-size:1rem;transition:transform .2s}.book-label--selectable{-webkit-user-select:none;user-select:none;transition:background .15s}.book-label--selectable:hover{background:#ebcb8b24}.book-label--checked{background:#ebcb8b29}.major-category-group{margin-bottom:28px}.major-category-label{color:#a3d48e;text-align:left;background:#a3be8c14;border-left:3px solid #7db860;border-radius:0 6px 6px 0;justify-content:space-between;align-items:center;margin:0 0 12px;padding:5px 12px;font-size:.95rem;font-weight:700;display:flex}.major-toggle-area{cursor:pointer;-webkit-user-select:none;user-select:none;flex:1;align-items:center;gap:8px;min-width:0;display:flex}@media (hover:hover){.major-toggle-area:hover .major-label-text{color:#c3e4b0}}.major-chevron{color:#7db860;flex-shrink:0;font-size:.65rem;transition:transform .15s}.major-chevron--open{transform:rotate(90deg)}.major-label-text{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.major-summary{color:var(--color-text-muted);white-space:nowrap;font-variant-numeric:tabular-nums;flex-shrink:0;font-size:.75rem;font-weight:400}.select-badge{color:var(--color-text-secondary);cursor:pointer;border:1px solid var(--color-border-strong);background:0 0;border-radius:10px;flex-shrink:0;padding:2px 8px;font-size:.75rem;font-weight:400;transition:border-color .15s,color .15s}@media (hover:hover){.select-badge:hover{border-color:var(--color-primary);color:var(--color-accent)}}.select-badge--active{color:var(--color-accent);border-color:var(--color-primary)}.category-grid{flex-direction:column;gap:6px;animation:.15s fadeIn;display:flex}.category-card{background:var(--color-surface);border:1px solid var(--color-border);cursor:pointer;text-align:left;border-radius:8px;flex-direction:row;align-items:center;gap:10px;min-height:46px;padding:10px 14px;transition:border-color .2s,background .2s;display:flex}@media (hover:hover){.category-card:hover:not(.category-card--disabled){border-color:var(--color-primary-light);background:var(--color-surface-hover)}}.category-card--disabled{opacity:.35;cursor:default}.category-card--checked{border-color:var(--color-primary-light);background:var(--color-surface-active)}.card-check{color:var(--color-accent);flex-shrink:0;width:14px;font-size:.75rem;font-weight:700}.category-name{color:var(--color-text-bright);white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;font-size:.88rem;font-weight:700;overflow:hidden}.category-count{color:var(--color-text-muted);white-space:nowrap;font-variant-numeric:tabular-nums;flex-shrink:0;font-size:.75rem}.category-card-status{flex-shrink:0;align-items:center;gap:10px;display:flex}.category-progress{flex-direction:row;flex-shrink:0;align-items:center;gap:6px;display:flex}.category-progress-bar{background:var(--color-border);border-radius:2px;width:52px;height:4px;overflow:hidden}.category-progress-fill{background:var(--color-success);border-radius:2px;height:100%;transition:width .4s}.category-progress-text{color:var(--color-success);white-space:nowrap;font-variant-numeric:tabular-nums;font-size:.75rem}.btn-reset-section{border:1px solid var(--color-border-strong);color:var(--color-text-secondary);cursor:pointer;white-space:nowrap;background:0 0;border-radius:5px;flex-shrink:0;padding:2px 8px;font-size:.75rem;line-height:1.5;transition:border-color .15s,color .15s,background .15s}.btn-reset-section:hover{border-color:var(--color-danger);color:var(--color-danger);background:#bf616a14}.major-category-actions{align-items:center;gap:6px;display:flex}.btn-reset-major{border:1px solid var(--color-border-strong);color:var(--color-text-secondary);cursor:pointer;white-space:nowrap;background:0 0;border-radius:5px;padding:2px 8px;font-size:.75rem;transition:border-color .15s,color .15s,background .15s}.btn-reset-major:hover{border-color:var(--color-danger);color:var(--color-danger);background:#bf616a14}.book-reset-bar{justify-content:flex-end;margin-bottom:14px;display:flex}.btn-reset-book{border:1px solid var(--color-border-strong);color:var(--color-text-secondary);cursor:pointer;white-space:nowrap;background:0 0;border-radius:6px;padding:2px 8px;font-size:.75rem;transition:border-color .15s,color .15s,background .15s}.btn-reset-book:hover{border-color:var(--color-danger);color:var(--color-danger);background:#bf616a14}.start-button-bar{padding:16px 16px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(transparent, var(--color-bg) 30%);z-index:100;flex-direction:column;align-items:center;gap:10px;margin-top:16px;display:flex;position:sticky;bottom:0}.question-count-row{align-items:center;gap:10px;width:100%;max-width:420px;display:flex}.question-count-label{color:var(--color-text-secondary);white-space:nowrap;flex-shrink:0;font-size:.85rem}.question-count-value{color:var(--color-accent);white-space:nowrap;text-align:right;font-variant-numeric:tabular-nums;flex-shrink:0;min-width:76px;font-size:.85rem;font-weight:700}.question-count-slider{appearance:none;cursor:pointer;background:0 0;flex:1;min-width:0;height:28px;margin:0}.question-count-slider::-webkit-slider-runnable-track{background:var(--track-fill,var(--color-border-strong));border-radius:3px;height:6px}.question-count-slider::-moz-range-track{background:var(--track-fill,var(--color-border-strong));border-radius:3px;height:6px}.question-count-slider::-webkit-slider-thumb{-webkit-appearance:none;background:var(--color-text-bright);border:2px solid var(--color-primary);border-radius:50%;width:22px;height:22px;margin-top:-8px;box-shadow:0 1px 4px #00000059}.question-count-slider::-moz-range-thumb{background:var(--color-text-bright);border:2px solid var(--color-primary);border-radius:50%;width:22px;height:22px;box-shadow:0 1px 4px #00000059}.btn-start{background:var(--color-primary);color:var(--color-text-bright);cursor:pointer;border:none;border-radius:10px;padding:14px 40px;font-size:1.1rem;font-weight:700;transition:background .2s,transform .1s;box-shadow:0 4px 14px #5e81ac66}.btn-start:hover:not(:disabled){background:var(--color-primary-hover);transform:translateY(-1px)}.btn-start:active:not(:disabled){transform:scale(.97)}.btn-start:disabled{opacity:.35;cursor:default}.problem-list{text-align:center}.problem-list-header{align-items:center;gap:16px;margin-bottom:8px;display:flex}.category-title{color:var(--color-text-bright);margin:0;font-size:1.4rem;font-weight:700}.app-title{color:var(--color-text-bright);margin-bottom:8px;font-size:2rem;font-weight:700}.problem-list-subtitle{color:var(--color-text-muted);margin-bottom:32px}.problem-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px;display:grid}.problem-card{background:var(--color-surface);border:1px solid var(--color-border);cursor:pointer;border-radius:10px;padding:24px 12px;transition:border-color .2s,transform .15s,background .2s}.problem-card:hover{border-color:var(--color-primary-light);background:var(--color-surface-hover);transform:translateY(-2px)}.problem-number{color:var(--color-primary-light);font-size:1rem;font-weight:700}.problem-view{flex-direction:column;gap:20px;display:flex}.problem-header{justify-content:space-between;align-items:center;display:flex}.btn-back{border:1px solid var(--color-border);color:var(--color-text-secondary);cursor:pointer;background:0 0;border-radius:8px;padding:6px 14px;font-size:.9rem;transition:border-color .2s,color .2s}.btn-back:hover{border-color:var(--color-primary-light);color:var(--color-accent)}.problem-header-right{flex-direction:column;align-items:flex-end;gap:2px;display:flex}.problem-counter{color:var(--color-text-muted);font-variant-numeric:tabular-nums;font-size:.9rem}.problem-id-label{color:var(--color-text-muted);font-family:monospace;font-size:.78rem}.problem-info-row{justify-content:flex-start;align-items:center;gap:12px;margin-top:-12px;display:flex}.problem-situation{color:var(--color-text-bright);letter-spacing:.08em;white-space:nowrap;background:#88c0d01a;border:1px solid #88c0d059;border-radius:6px;padding:4px 12px;font-size:.9rem;font-weight:600}.problem-note{color:#9aa7b8;white-space:pre-wrap;background:#ffffff0a;border-left:3px solid #4a5a7a;border-radius:4px;margin-top:8px;padding:8px 12px;font-size:.85rem;line-height:1.6}.dora-indicator{flex-shrink:0;align-items:flex-end;gap:2px;display:flex}.dora-indicator-back{box-sizing:border-box;background:linear-gradient(150deg,#f5cc7a 0%,#e0a045 55%,#c47e28 100%);border:1px solid #7a4a10;border-radius:3px;flex-shrink:0;width:26px;height:36px;box-shadow:inset 1px 1px 3px #ffdc7873,inset -1px -1px 2px #0000004d}.dora-indicator-tile{object-fit:contain;background:#fff;border-radius:3px;flex-shrink:0;width:26px;height:36px;padding:2px;display:block}.problem-image-wrapper{background:var(--color-surface);border:1px solid var(--color-border);text-align:center;border-radius:10px;overflow:hidden}.problem-image{object-fit:contain;width:100%;max-height:320px;display:block}.problem-image-placeholder{height:180px;color:var(--color-border-strong);justify-content:center;align-items:center;font-size:.9rem;display:flex}.hand-and-melds{align-items:flex-end;gap:12px;padding-top:6px;padding-bottom:4px;display:flex;overflow-x:auto}.tile-selector{flex-wrap:nowrap;align-items:flex-end;gap:6px;display:flex}.melds-area{border-left:1px solid var(--color-border);flex-direction:row-reverse;flex-shrink:0;justify-content:flex-end;align-items:flex-end;gap:8px;padding-left:12px;display:flex}.meld-set{flex-direction:column;align-items:center;gap:4px;display:flex}.meld-type-badge{color:var(--color-text-muted);white-space:nowrap;font-size:.75rem}.meld-tiles{align-items:flex-end;gap:2px;display:flex}.meld-tile{flex-shrink:0;justify-content:center;align-items:center;display:flex}.meld-tile img{object-fit:contain;background:#fff;border-radius:4px;width:36px;height:49px;padding:2px;display:block}.meld-tile--rotated{--tile-w:36px;--tile-h:49px}.meld-tile--back{background:var(--color-border);border:1px solid var(--color-border-strong);border-radius:4px;width:36px;height:49px}.tile-button{cursor:pointer;background:linear-gradient(160deg,#fff 0%,#f0efec 100%);border:2px solid #b8c0cc;border-radius:6px;justify-content:center;align-items:center;width:40px;height:55px;padding:0;transition:border-color .15s,transform .1s,opacity .2s,box-shadow .15s,filter .1s;display:flex;position:relative;box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,2px 4px 6px #00000038}@media (hover:hover){.tile-button:hover:not(:disabled){border-color:var(--color-primary-light);transform:translateY(-4px)}}.tile-button:disabled{cursor:default}.tile-button:active:not(:disabled){filter:brightness(.85)}.tile-button:after{content:"";position:absolute;inset:-6px -1px}.tile-button--correct{box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,2px 4px 6px #00000038}.tile-button--wrong{opacity:.65;box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,2px 4px 6px #00000038}.tile-button--disabled{opacity:.35}.tile-button--selected{border-color:var(--color-primary-light);transform:translateY(-4px);box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,2px 4px 6px #00000038,0 0 8px #81a1c180}.tile-button--missed{border-color:#d08770;box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,0 0 8px #d0877073}.tile-order-badge{background:var(--color-primary);min-width:16px;height:16px;color:var(--color-text-bright);text-align:center;pointer-events:none;z-index:2;border-radius:8px;padding:0 3px;font-size:.7rem;font-weight:700;line-height:16px;position:absolute;top:-8px;right:-4px;box-shadow:0 1px 3px #0006}.betaori-order-row{flex-direction:column;gap:6px;margin:4px 0 12px;display:flex}.betaori-order-label{color:var(--color-text-secondary);font-size:.8rem}.betaori-order-tiles{gap:6px;display:flex}.betaori-order-tile{cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;background:linear-gradient(160deg,#fff 0%,#f0efec 100%);border:2px solid #b8c0cc;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:55px;padding:1px;display:inline-flex;position:relative;box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,2px 4px 6px #00000038}.betaori-order-tile img{pointer-events:none;width:88%;height:auto}.betaori-order-tile--dragging{cursor:grabbing;opacity:.35}.betaori-order-tile--drop-before:before,.betaori-order-tile--drop-after:after{content:"";pointer-events:none;background:#f5c842;border-radius:2px;width:3px;position:absolute;top:-2px;bottom:-2px}.betaori-order-tile--drop-before:before{left:-5px}.betaori-order-tile--drop-after:after{right:-5px}.betaori-answer-compare{flex-direction:column;gap:10px;width:100%;display:flex}.betaori-answer-line{align-items:center;gap:6px;display:flex}.betaori-answer-line-label{width:7.5em;color:var(--color-text-secondary);flex-shrink:0;font-size:.9rem}.betaori-answer-tile{position:relative}.tile-readonly--ok{border:2px solid #a3be8c}.tile-readonly--ng{border:2px solid #bf616a}.tile-image{object-fit:contain;width:34px;height:49px}.tile-fallback{color:#333;text-align:center;font-size:.75rem}.answer-panel{border-radius:10px;flex-direction:column;gap:12px;padding:20px;animation:.18s ease-out answer-in;display:flex}@keyframes answer-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.answer-panel--correct .answer-result{animation:.3s ease-out correct-pop}@keyframes correct-pop{0%{opacity:.4;transform:scale(.85)}60%{transform:scale(1.08)}to{opacity:1;transform:scale(1)}}.answer-panel--correct{background:#a3be8c1a;border:1px solid #6a8c5a}.answer-panel--wrong{background:#bf616a1a;border:1px solid #8a4a50}.answer-result{font-size:1.4rem;font-weight:700}.answer-panel--correct .answer-result{color:var(--color-success)}.answer-panel--wrong .answer-result{color:var(--color-danger)}.answer-tile{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.answer-label{color:var(--color-text-secondary);font-size:1rem}.answer-value-miss{color:var(--color-text-secondary);margin-top:4px;font-size:.9rem;line-height:1.6}.answer-value-miss strong{color:var(--color-accent);margin:0 2px}.answer-tile-image{object-fit:contain;background:#fff;border-radius:4px;width:44px;height:60px;padding:2px}.answer-tile-name{color:var(--color-accent);font-size:1.1rem;font-weight:700}.answer-explanation{color:#c0c8d4;font-size:.95rem;line-height:1.8}.explanation-tile-img{object-fit:contain;vertical-align:middle;background:#fff;border-radius:3px;width:22px;height:30px;margin:0 2px;padding:1px}.discarded-tile-display{background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;align-items:center;gap:10px;margin-bottom:8px;padding:10px 16px;display:flex}.discarded-tile-label{color:var(--color-text-muted);white-space:nowrap;font-size:.85rem;font-weight:700}.discarded-tile-img{object-fit:contain;background:#fff;border-radius:6px;width:36px;height:49px;padding:3px;display:block}.discarded-tile-name{color:var(--color-accent);font-size:.9rem;font-weight:700}.score-display{flex-wrap:wrap;align-items:stretch;gap:6px;margin-top:-4px;display:flex}.score-chip{background:#ffffff0a;border:1px solid #ffffff1f;border-radius:6px;flex-direction:column;gap:1px;padding:4px 10px;display:flex}.score-chip--self{border-color:var(--color-accent);background:#88c0d01a}.score-chip-wind{color:var(--color-text-muted);white-space:nowrap;align-items:center;gap:4px;font-size:.68rem;display:flex}.score-chip-self-badge{color:#0b1220;background:var(--color-accent);border-radius:3px;padding:0 4px;font-size:.62rem;font-weight:700}.score-chip-points{color:#dde4ee;font-variant-numeric:tabular-nums;white-space:nowrap;font-size:.88rem;font-weight:700}.score-chip--kyotaku .score-chip-points{color:var(--color-text-muted);font-weight:400}.other-discard-displays{flex-wrap:wrap;align-items:flex-start;gap:10px 16px;margin-top:4px;display:flex}.other-discard-displays--column{flex-direction:column}.other-discard-display{align-items:flex-end;gap:8px;display:flex}.other-discard-label{color:var(--color-text-muted);white-space:nowrap;flex-shrink:0;align-self:flex-start;padding-top:4px;font-size:.75rem;font-weight:700}.other-discard-tiles{flex-direction:column;align-items:flex-start;gap:3px;display:flex}.other-discard-tiles-row{align-items:flex-end;gap:2px;display:flex}.other-discard-tile{flex-shrink:0;justify-content:center;align-items:center;display:flex}.other-discard-tile img{object-fit:contain;background:#fff;border-radius:3px;width:22px;height:30px;padding:1px;display:block}.other-discard-tile--rotated{--tile-w:22px;--tile-h:30px}.other-discard-melds{flex-flow:row-reverse wrap;justify-content:flex-end;align-items:flex-end;gap:10px;margin-left:12px;display:flex}.other-discard-melds .meld-tile img{border-radius:3px;width:22px;height:30px;padding:1px}.other-discard-melds .meld-tile--rotated{--tile-w:22px;--tile-h:30px;width:30px;height:22px}.other-discard-melds .meld-tile--rotated img,.other-discard-melds .meld-tile--back{width:22px;height:30px}.naki-timing-btns{flex-direction:column;gap:10px;margin:16px 0;display:flex}.naki-timing-choice-btn{background:var(--color-surface);border:1px solid var(--color-border);color:#c8d0dc;cursor:pointer;text-align:center;border-radius:10px;width:100%;padding:14px 20px;font-size:1rem;transition:border-color .15s,background .15s,color .15s}.naki-timing-choice-btn:hover{border-color:var(--color-primary-light);color:var(--color-accent);background:var(--color-surface-active)}.naki-timing-choice-btn:active{transform:scale(.98)}.naki-choice-instruction{color:var(--color-text-muted);margin:8px 0 12px;font-size:.9rem}.naki-choice-submit-btn{background:var(--color-primary);width:100%;color:var(--color-text-bright);cursor:pointer;border:none;border-radius:10px;margin-bottom:16px;padding:12px;font-size:1rem;font-weight:700;transition:background .15s;display:block}.naki-choice-submit-btn:hover:not(:disabled){background:var(--color-primary-hover)}.naki-choice-submit-btn:active:not(:disabled){transform:scale(.98)}.naki-choice-submit-btn:disabled{opacity:.45;cursor:not-allowed}.dora-inline{border-left:1px solid var(--color-border);flex-direction:column;flex-shrink:0;align-items:center;gap:4px;padding-left:12px;display:flex}.dora-inline .dora-label{color:var(--color-text-muted);white-space:nowrap;font-size:.75rem}.dora-label{color:var(--color-text-muted);white-space:nowrap;font-size:.85rem}.dora-tile-image{object-fit:contain;background:#fff;border-radius:6px;width:40px;height:55px;padding:3px;display:block}.dora-tile-name{color:var(--color-accent);font-size:.95rem;font-weight:700}.tile-selector-row{flex-direction:column;align-items:stretch;gap:10px;display:flex}.riichi-toggle{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-muted);cursor:pointer;border-radius:8px;align-self:flex-start;padding:8px 28px;font-size:.95rem;font-weight:700;transition:background .15s,border-color .15s,color .15s,box-shadow .15s}@media (hover:hover){.riichi-toggle:hover:not(:disabled){border-color:var(--color-danger);color:var(--color-danger)}}.riichi-toggle--on{border-color:var(--color-danger);color:#e5d0d0;background:#6e3a3e;box-shadow:0 0 10px #bf616a4d}.riichi-toggle:disabled{cursor:default}.answer-riichi{color:var(--color-text-muted);font-size:1rem}.ankan-options{flex-wrap:wrap;gap:8px;margin-top:6px;display:flex}.ankan-btn{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-primary-light);cursor:pointer;border-radius:8px;align-items:center;gap:6px;padding:6px 14px 6px 10px;font-size:.9rem;font-weight:700;transition:border-color .15s,background .15s;display:flex}.ankan-btn:hover:not(:disabled){border-color:var(--color-primary-light);background:var(--color-surface-active)}.ankan-btn:active:not(:disabled){transform:scale(.96)}.ankan-btn:disabled{cursor:default}.ankan-btn img{object-fit:contain;background:#fff;border-radius:4px;width:34px;height:49px}.ankan-btn--correct{color:var(--color-success);background:#a3be8c1f;border-color:#6a8c5a}.ankan-btn--wrong{color:var(--color-danger);background:#bf616a1f;border-color:#8a4a50}.ankan-btn--disabled{border-color:var(--color-surface);opacity:.35}.tile-display-readonly{flex-wrap:nowrap;align-items:flex-end;gap:6px;padding-top:6px;padding-bottom:4px;display:flex;overflow-x:auto}.tile-readonly{background:linear-gradient(160deg,#fff 0%,#f0efec 100%);border:1px solid #b8c0cc;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:55px;padding:1px;display:inline-flex;box-shadow:inset 0 1px #fffffff2,inset 0 -1px #00000014,1px 2px #b06820,2px 4px 6px #00000038}.tile-readonly img{object-fit:contain;width:34px;height:49px;display:block}.riichi-choice-btns{justify-content:center;gap:16px;padding:8px 0;display:flex}.riichi-choice-btn{cursor:pointer;border:2px solid;border-radius:8px;flex:1;max-width:100px;padding:8px 0;font-size:.9rem;font-weight:700;transition:transform .1s,box-shadow .15s}@media (hover:hover){.riichi-choice-btn:hover{transform:translateY(-3px)}}.riichi-choice-btn:active{transform:translateY(0)}.riichi-choice-btn--riichi{border-color:var(--color-danger);color:var(--color-danger);background:#bf616a1a}.riichi-choice-btn--riichi:hover{background:#bf616a33;box-shadow:0 4px 14px #bf616a40}.riichi-choice-btn--dama{border-color:var(--color-primary-light);color:var(--color-primary-light);background:#81a1c11a}.riichi-choice-btn--dama:hover{background:#81a1c133;box-shadow:0 4px 14px #81a1c140}.chinitsu-tsumo-btn{color:#ebcb8b;background:#ebcb8b26;border-color:#ebcb8b}@media (hover:hover){.chinitsu-tsumo-btn:hover:not(:disabled){background:#ebcb8b40;box-shadow:0 4px 14px #ebcb8b40}}.tenpai-choice-btn--noten{border-color:var(--color-primary-light);color:var(--color-primary-light);background:#81a1c11a}@media (hover:hover){.tenpai-choice-btn--noten:hover:not(:disabled){background:#81a1c133;box-shadow:0 4px 14px #81a1c140}}.riichi-choice-btn:disabled{opacity:.35;cursor:not-allowed;transform:none}.chinitsu-share-btn{border:1px solid var(--color-border-strong);color:#fff;background:#000;border-radius:10px;justify-content:center;align-items:center;gap:8px;margin:12px 0 0;padding:12px;font-size:.95rem;font-weight:700;text-decoration:none;transition:background .2s,border-color .2s,box-shadow .2s;display:flex}@media (hover:hover){.chinitsu-share-btn:hover{border-color:var(--color-primary);background:#16181c;box-shadow:0 2px 10px #0006}}.chinitsu-share-icon{flex-shrink:0;width:18px;height:18px}.chinitsu-review-btn{border:1px solid var(--color-accent);width:100%;color:var(--color-accent);cursor:pointer;background:#88c0d01a;border-radius:8px;margin-top:14px;padding:13px;font-size:1rem;font-weight:700;transition:background .15s;display:block}@media (hover:hover){.chinitsu-review-btn:hover{background:#88c0d033}}.chinitsu-review-status{color:var(--color-accent);margin:0 0 12px;font-size:.9rem}.chinitsu-timeattack-btn{background:linear-gradient(135deg, var(--color-primary), #b48ead);width:100%;color:var(--color-text-bright);cursor:pointer;border:none;border-radius:8px;margin-top:12px;padding:13px;font-size:1rem;font-weight:700;transition:filter .15s,box-shadow .2s;display:block}@media (hover:hover){.chinitsu-timeattack-btn:hover{filter:brightness(1.08);box-shadow:0 3px 12px #0000004d}}.chinitsu-ta-intro,.chinitsu-ta-result{text-align:center;padding:12px 0}.chinitsu-ta-intro .chinitsu-instruction-list{text-align:left;max-width:32em;margin:6px auto 16px}.chinitsu-ta-section-label{text-align:left;max-width:32em;color:var(--color-accent);margin:14px auto 0;font-size:.9rem;font-weight:700}.chinitsu-ta-title{color:var(--color-text-bright);margin-bottom:8px;font-size:1.25rem}.chinitsu-ta-lead{color:var(--color-accent);margin-bottom:8px;font-size:1rem}.chinitsu-ta-start-btn{background:linear-gradient(135deg, var(--color-primary), #b48ead);width:100%;max-width:22em;color:var(--color-text-bright);cursor:pointer;border:none;border-radius:8px;margin:8px auto 0;padding:13px;font-size:1rem;font-weight:700;transition:filter .15s,box-shadow .2s;display:block}@media (hover:hover){.chinitsu-ta-start-btn:hover{filter:brightness(1.08);box-shadow:0 3px 12px #0000004d}}.chinitsu-ta-result .chinitsu-share-btn{max-width:22em;margin-left:auto;margin-right:auto}.chinitsu-ta-actions{gap:10px;max-width:24em;margin:14px auto 0;display:flex}.chinitsu-ta-actions--full{max-width:none;margin-left:0;margin-right:0}.chinitsu-ta-actions .chinitsu-ta-start-btn,.chinitsu-ta-actions .chinitsu-review-btn,.chinitsu-ta-actions .chinitsu-timeattack-btn{flex:1;width:auto;max-width:none;margin:0}.chinitsu-ta-result-label{color:var(--color-text-secondary);margin-bottom:4px;font-size:.95rem}.chinitsu-ta-result-score{color:var(--color-text-bright);margin-bottom:20px}.chinitsu-ta-result-score strong{color:var(--color-success);font-size:3rem;line-height:1}.chinitsu-ta-result-score span{margin-left:6px;font-size:1.1rem}.chinitsu-lb-register{text-align:left;max-width:24em;margin:0 auto 18px}.chinitsu-lb-register-label{color:var(--color-accent);margin:0 0 6px;font-size:.9rem;font-weight:700}.chinitsu-lb-register-row{gap:8px;display:flex}.chinitsu-lb-name-input{background:var(--color-surface);border:1px solid var(--color-border-strong);min-width:0;color:var(--color-text-bright);border-radius:8px;flex:1;padding:10px 12px;font-size:1rem}.chinitsu-lb-name-input::placeholder{color:var(--color-text-secondary)}.chinitsu-lb-register-btn{background:linear-gradient(135deg, var(--color-primary), #b48ead);color:var(--color-text-bright);cursor:pointer;border:none;border-radius:8px;flex-shrink:0;padding:10px 16px;font-size:.95rem;font-weight:700;transition:filter .15s,box-shadow .2s}@media (hover:hover){.chinitsu-lb-register-btn:hover{filter:brightness(1.08);box-shadow:0 3px 12px #0000004d}}.chinitsu-lb-register-btn:disabled{opacity:.5;cursor:not-allowed}.chinitsu-lb-honeypot{opacity:0;width:1px;height:1px;position:absolute;left:-9999px}.chinitsu-lb-registered{color:var(--color-success);text-align:center;margin:0;font-size:.95rem}.chinitsu-lb-registered strong{font-size:1.15rem}.chinitsu-lb-heading{color:var(--color-text-bright);text-align:center;margin:0 0 8px;font-size:1rem;font-weight:700}.chinitsu-lb-status{color:var(--color-text-secondary);text-align:center;margin:8px 0;font-size:.9rem}.chinitsu-lb-status--error{color:var(--color-danger,#bf616a)}.chinitsu-lb-list{max-width:26em;margin:0 auto 4px;padding:0;list-style:none}.chinitsu-lb-row{border-bottom:1px solid var(--color-border);align-items:center;gap:10px;padding:9px 12px;display:flex}.chinitsu-lb-row:last-child{border-bottom:none}.chinitsu-lb-row--me{background:#88c0d024;border-radius:8px}.chinitsu-lb-rank{text-align:center;width:1.8em;color:var(--color-text-secondary);flex-shrink:0;font-size:.95rem;font-weight:700}.chinitsu-lb-rank--1{color:#ebcb8b}.chinitsu-lb-rank--2{color:#d8dee9}.chinitsu-lb-rank--3{color:#d08770}.chinitsu-lb-name{min-width:0;color:var(--color-text-bright);text-overflow:ellipsis;white-space:nowrap;flex:1;align-items:center;gap:6px;font-size:.95rem;display:flex;overflow:hidden}.chinitsu-lb-me-badge{background:var(--color-accent);color:var(--color-bg,#2e3440);border-radius:999px;flex-shrink:0;padding:1px 6px;font-size:.7rem;font-weight:700}.chinitsu-lb-score{color:var(--color-success);flex-shrink:0;font-size:1rem;font-weight:700}.chinitsu-lb-score-unit{color:var(--color-text-secondary);margin-left:2px;font-size:.8rem;font-weight:400}.chinitsu-ta-timer{margin:4px 0 12px}.chinitsu-ta-timer-bar{background:var(--color-border);border-radius:4px;height:8px;overflow:hidden}.chinitsu-ta-timer-fill{background:var(--color-accent);border-radius:4px;height:100%;transition:width .1s linear,background .3s}.chinitsu-ta-timer--low .chinitsu-ta-timer-fill{background:var(--color-danger)}.chinitsu-ta-timer-text{color:var(--color-text-secondary);text-align:right;margin-top:4px;font-size:.9rem;font-weight:700;display:block}.chinitsu-ta-timer--low .chinitsu-ta-timer-text{color:var(--color-danger)}.chinitsu-rules-header{justify-content:space-between;align-items:center;gap:12px;margin:8px 0 6px;display:flex}.chinitsu-rules-title{color:var(--color-text-secondary);font-size:.9rem;font-weight:700}.chinitsu-instruction-list{color:var(--color-text-muted);margin:0 0 12px;padding-left:1.3em;font-size:.9rem;line-height:1.6}.chinitsu-instruction-list li+li{margin-top:4px}.chinitsu-suit-tabs{align-items:center;gap:6px;display:flex}.chinitsu-suit-tabs .tile-button{width:32px;height:44px}.chinitsu-suit-tabs .tile-image{width:88%;height:auto}.app-footer{text-align:center;border-top:1px solid var(--color-border);margin-top:36px;padding:16px 0 8px}.app-footer a{color:var(--color-text-muted);font-size:.85rem;text-decoration:none}.app-footer .feedback-widget{text-align:left;margin:0 0 16px}@media (hover:hover){.app-footer a:hover{color:var(--color-accent);text-decoration:underline}}.feedback-widget{margin:28px 0 8px}.feedback-toggle-btn{border:1px dashed var(--color-border-strong);width:100%;color:var(--color-text-muted);cursor:pointer;background:0 0;border-radius:10px;padding:10px;font-size:.9rem;transition:border-color .2s,color .2s;display:block}@media (hover:hover){.feedback-toggle-btn:hover{border-color:var(--color-primary-light);color:var(--color-text-secondary)}}.feedback-panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;flex-direction:column;gap:10px;padding:14px 16px;display:flex}.feedback-panel-header{justify-content:space-between;align-items:center;display:flex}.feedback-panel-title{color:var(--color-text-bright);font-size:.95rem;font-weight:700}.feedback-close-btn{border:1px solid var(--color-border);color:var(--color-text-secondary);cursor:pointer;background:0 0;border-radius:6px;padding:4px 10px;font-size:.8rem}.feedback-note{color:var(--color-text-muted);margin:0;font-size:.8rem}.feedback-chips{flex-wrap:wrap;gap:8px;display:flex}.feedback-chip{background:var(--color-bg);border:1px solid var(--color-border-strong);color:var(--color-text-secondary);cursor:pointer;border-radius:16px;padding:7px 12px;font-size:.85rem;transition:border-color .2s,color .2s}@media (hover:hover){.feedback-chip:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-accent)}}.feedback-chip:disabled{opacity:.5;cursor:default}.feedback-textarea{box-sizing:border-box;background:var(--color-bg);border:1px solid var(--color-border);width:100%;color:var(--color-text-bright);resize:vertical;border-radius:8px;padding:8px 10px;font-family:inherit;font-size:.9rem}.feedback-send-btn{background:var(--color-primary);color:var(--color-text-bright);cursor:pointer;border:none;border-radius:8px;align-self:flex-end;padding:8px 20px;font-size:.9rem;font-weight:700}.feedback-send-btn:disabled{opacity:.5;cursor:default}.feedback-status{margin:0;font-size:.85rem}.feedback-status--ok{color:var(--color-success,#a3be8c)}.feedback-status--error{color:var(--color-danger)}.pending-notice{text-align:center;color:#8b98aa;border:1px dashed var(--color-border);border-radius:8px;margin:8px 0;padding:24px;font-size:.95rem}.problem-nav{justify-content:space-between;gap:12px;display:flex}.btn-nav{background:var(--color-surface);border:1px solid var(--color-border);color:var(--color-text-secondary);cursor:pointer;border-radius:8px;flex:1;padding:10px 20px;font-size:.95rem;transition:border-color .2s,color .2s,background .2s}.btn-nav:hover:not(:disabled){border-color:var(--color-primary-light);color:var(--color-accent);background:var(--color-surface-hover)}.btn-nav:disabled{opacity:.25;cursor:default}.btn-nav--finish{background:var(--color-primary);border-color:var(--color-primary);color:var(--color-text-bright);font-weight:700}.btn-nav--finish:hover:not(:disabled){background:var(--color-primary-hover);border-color:var(--color-primary-hover);color:var(--color-text-bright)}.problem-progress{background:var(--color-border);border-radius:2px;height:4px;margin-top:-12px;overflow:hidden}.problem-progress-fill{background:var(--color-primary);border-radius:2px;height:100%;transition:width .3s}.session-summary{text-align:center;flex-direction:column;align-items:center;gap:18px;padding:40px 16px 24px;display:flex}.session-summary-title{color:var(--color-text-bright);margin:0;font-size:1.3rem}.session-summary-score{font-variant-numeric:tabular-nums;align-items:baseline;gap:8px;display:flex}.session-summary-correct{color:var(--color-accent);font-size:3rem;font-weight:700;line-height:1}.session-summary-total{color:var(--color-text-secondary);font-size:1rem}.session-summary-bar{background:var(--color-border);border-radius:4px;width:100%;max-width:360px;height:8px;overflow:hidden}.session-summary-bar-fill{background:var(--color-success);border-radius:4px;height:100%;transition:width .5s}.session-summary-note{color:var(--color-text-muted);margin:0;font-size:.85rem}.session-summary-perfect{color:var(--color-success);margin:0;font-size:1.15rem;font-weight:700}.session-summary-wrong{background:var(--color-surface);border:1px solid var(--color-border);text-align:left;border-radius:10px;width:100%;max-width:420px;padding:14px 16px}.session-summary-wrong-title{color:var(--color-danger);margin:0 0 8px;font-size:.9rem}.session-summary-wrong-list{color:var(--color-text);flex-direction:column;gap:4px;max-height:240px;margin:0;padding:0;font-size:.88rem;list-style:none;display:flex;overflow-y:auto}.session-summary-wrong-id{color:var(--color-text-muted);font-family:monospace;font-size:.78rem}.session-summary-upgrade{background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;flex-direction:column;gap:12px;width:100%;max-width:420px;padding:14px 16px;display:flex}.session-summary-upgrade-text{color:var(--color-text);margin:0;font-size:.92rem;line-height:1.5}.session-summary-upgrade-actions{gap:10px;display:flex}.btn-upgrade-confirm,.btn-upgrade-keep{cursor:pointer;border-radius:10px;flex:1;padding:12px 14px;font-size:.92rem;font-weight:700;transition:background .2s,border-color .2s,color .2s,transform .1s}.btn-upgrade-confirm{background:var(--color-success);color:var(--color-text-bright);border:none}.btn-upgrade-confirm:active{transform:scale(.97)}.btn-upgrade-keep{background:var(--color-surface);border:1px solid var(--color-border);color:var(--color-text-secondary)}.session-summary-upgrade-done{color:var(--color-success);margin:0;font-size:.9rem;font-weight:700}.session-summary-actions{flex-direction:column;gap:10px;width:100%;max-width:360px;margin-top:6px;display:flex}.btn-retry-wrong{background:var(--color-primary);color:var(--color-text-bright);cursor:pointer;border:none;border-radius:10px;padding:14px 20px;font-size:1rem;font-weight:700;transition:background .2s,transform .1s;box-shadow:0 4px 14px #5e81ac66}.btn-retry-wrong:hover{background:var(--color-primary-hover)}.btn-retry-wrong:active{transform:scale(.97)}.btn-back-to-categories{background:var(--color-surface);border:1px solid var(--color-border);color:var(--color-text-secondary);cursor:pointer;border-radius:10px;padding:12px 20px;font-size:.95rem;transition:border-color .2s,color .2s}.btn-back-to-categories:hover{border-color:var(--color-primary-light);color:var(--color-accent)}@media (width<=600px){.app-header{margin:-14px -10px 22px;padding:12px 14px}.user-name{display:none}.category-grid{gap:6px}.category-card{flex-wrap:wrap}.category-card-status{flex:100%;justify-content:space-between;margin-left:24px}.app-title{font-size:1.4rem}.tile-selector{flex-wrap:nowrap;justify-content:center;gap:2px;overflow-x:visible}.tile-button{width:clamp(19px, calc((100vw - 20px - (var(--hand-count,14) - 1) * 2px) / var(--hand-count,14)), 40px);aspect-ratio:40/55;height:auto}.tile-image{width:88%;height:auto}.tile-display-readonly{flex-wrap:nowrap;justify-content:center;gap:2px;overflow-x:visible}.tile-readonly{width:clamp(19px, calc((100vw - 20px - (var(--hand-count,14) - 1) * 2px) / var(--hand-count,14)), 40px);aspect-ratio:40/55;height:auto}.tile-readonly img{width:88%;height:auto}.hand-and-melds{--mob-tile-w:clamp(19px, calc((100vw - 20px - (var(--hand-count,14) - 1) * 2px) / var(--hand-count,14)), 40px);gap:6px}.hand-and-melds .tile-button,.hand-and-melds .tile-readonly{width:var(--mob-tile-w)}.melds-area{--mob-meld-w:calc(var(--mob-tile-w,40px) * .9);--mob-meld-h:calc(var(--mob-meld-w) * 49 / 36);gap:4px;padding-left:5px}.meld-tile img{width:var(--mob-meld-w,36px);height:var(--mob-meld-h,49px)}.meld-tile--rotated{--tile-w:var(--mob-meld-w,36px);--tile-h:var(--mob-meld-h,49px)}.meld-tile--back{width:var(--mob-meld-w,36px);height:var(--mob-meld-h,49px)}.other-discard-display{--od-tile-w:clamp(14px, calc((100vw - 96px - (var(--od-units,6) - 1) * 2px) / var(--od-units,6)), 22px);--od-tile-h:calc(var(--od-tile-w) * 30 / 22);overflow-x:auto}.other-discard-tile img{width:var(--od-tile-w);height:var(--od-tile-h)}.other-discard-tile--rotated{--tile-w:var(--od-tile-w);--tile-h:var(--od-tile-h)}.other-discard-melds{flex-wrap:nowrap;gap:6px;margin-left:8px}.other-discard-melds .meld-tile img{width:var(--od-tile-w);height:var(--od-tile-h)}.other-discard-melds .meld-tile--rotated{--tile-w:var(--od-tile-w);--tile-h:var(--od-tile-h);width:var(--od-tile-h);height:var(--od-tile-w)}.other-discard-melds .meld-tile--back{width:var(--od-tile-w);height:var(--od-tile-h)}.answer-panel{padding:14px}.betaori-order-tile{width:clamp(22px, calc((100vw - 32px - (var(--order-count,6) - 1) * 6px) / var(--order-count,6)), 40px);aspect-ratio:40/55;height:auto}.betaori-answer-line{flex-wrap:wrap;row-gap:4px}.betaori-answer-line-label{width:100%}.problem-nav{z-index:100;padding:10px 10px calc(10px + env(safe-area-inset-bottom));background:linear-gradient(transparent, var(--color-bg) 30%);margin:4px -10px -14px;position:sticky;bottom:0}.btn-nav{padding:10px 8px;font-size:.85rem}.dora-tile-image{width:40px;height:55px}}.loading-skeleton{flex-direction:column;gap:8px;padding-top:8px;display:flex}.skeleton-block{background:linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-hover) 50%, var(--color-surface) 75%);background-size:200% 100%;border-radius:8px;animation:1.4s ease-in-out infinite skeleton-shimmer}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-toggle{align-self:flex-end;width:180px;height:26px;margin-bottom:16px}.skeleton-tabs{gap:6px;margin-bottom:12px;display:flex}.skeleton-tab{width:110px;height:38px}.skeleton-heading{width:45%;height:30px;margin-bottom:4px}.skeleton-card{height:46px}.question-image-wrap{text-align:center;width:100%;margin:8px 0 12px}.question-image{object-fit:contain;border:1px solid #3a4a6a;border-radius:8px;max-width:100%;max-height:360px}.tile-rotated{width:var(--tile-h);height:var(--tile-w);justify-content:center;align-items:center;display:flex}.tile-rotated img{width:var(--tile-w);height:var(--tile-h);transform:rotate(90deg)}