:root{--bg: #0e1626;--bg-raise: #16223a;--bg-sunken: #0a111e;--line: #24334f;--text: #f2f5fa;--text-muted: #8fa0bc;--amber: #ffb454;--ok: #34d399;--ng: #f87171;--radius: 14px;--mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Hiragino Kaku Gothic ProN,Hiragino Sans,Noto Sans JP,sans-serif;-webkit-font-smoothing:antialiased;overscroll-behavior:none}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;-webkit-tap-highlight-color:transparent}button:focus-visible,input:focus-visible{outline:2px solid var(--amber);outline-offset:2px}.mono{font-family:var(--mono);letter-spacing:.06em}.app{max-width:480px;margin:0 auto;min-height:100dvh}.screen{display:flex;flex-direction:column;min-height:100dvh;padding:calc(env(safe-area-inset-top,0px) + 20px) 20px calc(env(safe-area-inset-bottom,0px) + 20px);gap:18px}.home-header{padding-top:12px}.brand{display:flex;align-items:baseline;gap:10px}.brand-mark{color:var(--amber);font-size:22px}.brand h1{font-size:32px;font-weight:800;letter-spacing:-.02em}.tagline{margin-top:6px;color:var(--text-muted);font-size:14px}.stats-row{display:flex;gap:10px}.stat{flex:1;background:var(--bg-raise);border:1px solid var(--line);border-radius:var(--radius);padding:12px 8px;display:flex;flex-direction:column;align-items:center;gap:2px}.stat-value{font-family:var(--mono);font-size:22px;font-weight:700;color:var(--amber)}.stat-label{font-size:11px;color:var(--text-muted)}.panel{background:var(--bg-raise);border:1px solid var(--line);border-radius:var(--radius);padding:16px}.panel-title{font-size:12px;font-weight:600;color:var(--text-muted);letter-spacing:.08em;margin-bottom:12px}.chip-grid{display:flex;flex-wrap:wrap;gap:8px}.chip{display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:999px;border:1.5px solid var(--line);background:var(--bg-sunken);color:var(--text-muted);font-size:14px;font-weight:600;transition:border-color .15s,color .15s,transform .1s}.chip:active{transform:scale(.96)}.chip-active{color:var(--text);background:var(--bg)}.chip-flag{font-size:15px}.level-list{list-style:none;display:flex;flex-direction:column;gap:12px}.level-row{display:flex;align-items:center;justify-content:space-between;gap:10px}.level-lang{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;min-width:0}.board-code{font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.1em;border:1px solid currentColor;border-radius:4px;padding:2px 5px}.segmented{display:flex;background:var(--bg-sunken);border:1px solid var(--line);border-radius:10px;padding:3px;gap:2px}.segment{display:flex;flex-direction:column;align-items:center;padding:5px 10px;border-radius:8px;font-size:12px;font-weight:700;color:var(--text-muted);line-height:1.2}.segment small{font-family:var(--mono);font-size:9px;font-weight:400;opacity:.75}.segment-active{color:#0a111e}.home-footer{margin-top:auto;display:flex;flex-direction:column;gap:10px}.primary-btn{width:100%;padding:16px;border-radius:var(--radius);background:var(--amber);color:#201404;font-size:16px;font-weight:800;letter-spacing:.02em;transition:transform .1s,opacity .15s}.primary-btn:active{transform:scale(.98)}.primary-btn:disabled{opacity:.35;cursor:default}.ghost-btn{width:100%;padding:14px;border-radius:var(--radius);border:1px solid var(--line);color:var(--text-muted);font-size:14px;font-weight:600}.hint{text-align:center;font-size:12px;color:var(--text-muted)}.due-notice{text-align:center;font-size:13px;color:var(--text);background:#ffb4541a;border:1px solid rgba(255,180,84,.4);border-radius:var(--radius);padding:10px}.due-count{color:var(--amber);font-weight:700}.quiz-header{display:flex;align-items:center;gap:12px}.icon-btn{font-size:16px;color:var(--text-muted);padding:6px}.progress-track{flex:1;height:10px;background:var(--bg-sunken);border:1px solid var(--line);border-radius:999px;overflow:hidden}.progress-fill{height:100%;border-radius:999px;transition:width .35s ease,background .35s ease}.progress-count{font-size:12px;color:var(--text-muted)}.board{display:flex;align-items:center;gap:10px;background:var(--bg-sunken);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px}.board-flap{display:inline-block;font-size:15px;font-weight:700;border:1.5px solid;border-radius:6px;padding:4px 8px;background:var(--bg);animation:flap .5s ease both;transform-origin:top center}@keyframes flap{0%{transform:rotateX(90deg);opacity:0}60%{transform:rotateX(-18deg)}to{transform:rotateX(0);opacity:1}}.board-name{font-size:14px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.board-flap-hidden{color:var(--text-muted);border-color:var(--line);letter-spacing:.2em}.board-name-hidden{color:var(--text-muted)}.hint-btn{margin-left:auto;padding:7px 14px;border-radius:999px;border:1px solid var(--amber);color:var(--amber);font-size:12px;font-weight:700;flex-shrink:0}.hint-btn:active{transform:scale(.96)}.review-badge{margin-left:auto;font-size:10px;font-weight:700;color:var(--amber);border:1px solid var(--amber);border-radius:4px;padding:2px 6px;flex-shrink:0}.hint-btn+.review-badge{margin-left:8px}.task-label{font-size:13px;color:var(--text-muted);text-align:center;margin-top:-8px}.quiz-body{display:flex;flex-direction:column;gap:16px;flex:1}.prompt-card{background:var(--bg-raise);border:1.5px solid var(--line);border-radius:var(--radius);padding:26px 18px;text-align:center;position:relative}.prompt-text{font-size:24px;font-weight:700;line-height:1.4;overflow-wrap:anywhere}.mini-speaker{position:absolute;right:10px;bottom:8px;font-size:16px;opacity:.7}.speaker-btn{align-self:center;font-size:44px;background:var(--bg-raise);border:1.5px solid var(--line);border-radius:50%;width:110px;height:110px;margin:10px auto;transition:transform .1s}.speaker-btn:active{transform:scale(.94)}.choices{display:flex;flex-direction:column;gap:10px}.choice-btn{padding:15px 16px;border-radius:var(--radius);border:1.5px solid var(--line);background:var(--bg-raise);font-size:17px;font-weight:600;text-align:left;transition:transform .1s,border-color .15s,background .15s;overflow-wrap:anywhere}.choice-btn:active:not(:disabled){transform:scale(.98)}.choice-correct{border-color:var(--ok);background:#34d3991f;color:var(--ok)}.choice-wrong{border-color:var(--ng);background:#f871711f;color:var(--ng)}.choice-selected{border-color:var(--amber);background:#ffb4541a}.choice-missed{border-color:var(--ok);border-style:dashed;color:var(--ok);opacity:.85}.choice-lang-tag{float:right;font-size:10px;font-weight:700;border:1px solid currentColor;border-radius:4px;padding:1px 5px;margin-left:8px;margin-top:3px}.order-answer{min-height:58px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px;border-bottom:1.5px dashed var(--line)}.order-placeholder{color:var(--text-muted);font-size:13px}.order-bank{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;padding:8px 0}.token{padding:10px 14px;border-radius:10px;border:1.5px solid var(--line);background:var(--bg-raise);font-size:16px;font-weight:600;transition:opacity .15s,transform .1s}.token:active:not(:disabled){transform:scale(.95)}.token-used{opacity:.18}.token-placed{border-color:var(--amber)}.type-input{width:100%;padding:16px;border-radius:var(--radius);border:1.5px solid var(--line);background:var(--bg-raise);color:var(--text);font-size:18px;font-family:inherit}.type-input::placeholder{color:var(--text-muted)}.check-btn{margin-top:auto}.feedback{position:sticky;bottom:0;margin:0 -20px calc(env(safe-area-inset-bottom,0px)*-1 - 20px);padding:18px 20px calc(env(safe-area-inset-bottom,0px) + 18px);border-radius:20px 20px 0 0;display:flex;flex-direction:column;gap:12px;animation:rise .25s ease both}@keyframes rise{0%{transform:translateY(30%);opacity:0}to{transform:translateY(0);opacity:1}}.feedback-correct{background:#123528;border-top:1.5px solid var(--ok)}.feedback-wrong{background:#3a1a1e;border-top:1.5px solid var(--ng)}.feedback-partial{background:#38290f;border-top:1.5px solid var(--amber)}.feedback-partial strong{color:var(--amber);font-size:18px}.feedback-text{display:flex;flex-direction:column;gap:4px;font-size:14px}.feedback-correct strong{color:var(--ok);font-size:18px}.feedback-wrong strong{color:var(--ng);font-size:18px}.feedback-text b{font-size:16px}.continue-btn{padding:14px}.result-header{text-align:center;padding-top:28px}.result-eyebrow{color:var(--amber);font-size:12px;letter-spacing:.35em;margin-bottom:8px}.result-header h1{font-size:26px;font-weight:800}.stamp-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:12px}.stamp{aspect-ratio:1;border:2.5px dashed var(--line);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--text-muted);transform:rotate(-8deg);animation:stamp-in .35s cubic-bezier(.2,1.6,.5,1) both}@keyframes stamp-in{0%{transform:rotate(-8deg) scale(1.7);opacity:0}to{transform:rotate(-8deg) scale(1);opacity:1}}.stamp-hit{border-style:solid}.stamp-code{font-size:15px;font-weight:700}.stamp-name{font-size:11px}.stamp-score{font-size:11px;opacity:.8}.wordbook-header{display:flex;align-items:center;gap:10px}.wordbook-header h1{font-size:22px;font-weight:800}.wordbook-summary{font-size:13px;color:var(--text-muted)}.wordbook-search{font-size:14px;padding:12px 14px}.word-list{list-style:none;display:flex;flex-direction:column}.word-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}.word-row:last-child{border-bottom:none}.word-main{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;min-width:0;flex:1}.word-term{font-size:16px;font-weight:700;overflow-wrap:anywhere}.word-meaning{font-size:12px;color:var(--text-muted);overflow-wrap:anywhere}.word-status{display:flex;flex-direction:column;align-items:flex-end;gap:5px;flex-shrink:0}.strength-track{width:64px;height:5px;background:var(--bg-sunken);border-radius:999px;overflow:hidden}.strength-fill{height:100%;border-radius:999px}.due-label{font-size:11px}.due-unseen{color:var(--text-muted);opacity:.7}.due-due{color:var(--amber);font-weight:700}.due-scheduled{color:var(--text-muted)}.prompt-reading{margin-top:6px;font-size:13px;color:var(--text-muted);letter-spacing:.04em}.choice-main{display:inline-flex;flex-direction:column;align-items:flex-start;gap:1px}.choice-reading,.word-reading{font-size:11px;font-weight:400;color:var(--text-muted)}.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.match-col{display:flex;flex-direction:column;gap:10px}.match-tile{min-height:62px;padding:10px 8px;border-radius:var(--radius);border:1.5px solid var(--line);background:var(--bg-raise);font-size:15px;font-weight:600;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;overflow-wrap:anywhere;transition:transform .1s,border-color .15s,opacity .2s}.match-tile:active:not(:disabled){transform:scale(.96)}.match-active{border-color:var(--amber);background:#ffb4541a}.match-solved{border-color:var(--ok);color:var(--ok);opacity:.45}.match-shake{animation:shake .35s ease;border-color:var(--ng)}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}50%{transform:translate(5px)}75%{transform:translate(-3px)}}.note-card{background:#ffb45414;border:1px dashed rgba(255,180,84,.5);border-radius:10px;padding:10px 12px;display:flex;flex-direction:column;gap:4px}.note-eyebrow{font-size:10px;letter-spacing:.12em;color:var(--amber)}.note-card p{font-size:13px;line-height:1.6;color:var(--text)}.chip-sm{padding:7px 11px;font-size:12px}.chip-amber{border-color:var(--amber)!important;color:var(--amber)!important}.details-panel summary{cursor:pointer;list-style:none;-webkit-user-select:none;user-select:none}.details-panel summary:before{content:"▸ "}.details-panel[open] summary:before{content:"▾ "}.settings-body{display:flex;flex-direction:column;gap:16px;margin-top:14px}.setting-group{display:flex;flex-direction:column;gap:8px;align-items:flex-start}.setting-label{font-size:12px;font-weight:600;color:var(--text-muted)}.segment-amber{background:var(--amber)!important}.api-key-input{font-size:13px;padding:10px 12px}.footer-links{display:flex;gap:10px}.account-btn{margin-left:auto;align-self:center;padding:6px 12px;border-radius:999px;border:1px solid var(--line);color:var(--text-muted);font-size:12px;font-weight:600;max-width:45%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account-email{font-size:16px;font-weight:700;margin-bottom:8px;overflow-wrap:anywhere}.account-mode{margin-bottom:14px}.account-mode .segment{flex:1;padding:9px}.account-form{display:flex;flex-direction:column;gap:10px}.account-error{color:var(--ng);font-size:13px;text-align:center}.link-sent{font-size:14px;line-height:1.7}.pro-pitch{margin-top:12px;font-size:12px;line-height:1.7;color:var(--text-muted);border-top:1px dashed var(--line);padding-top:10px}.pro-pitch b{color:var(--amber)}.pro-link{color:var(--amber);font-size:12px;font-weight:700;text-decoration:underline;padding:0}.tasting-card{border-color:#ffb45480;background:linear-gradient(160deg,var(--bg-raise),rgba(255,180,84,.06))}.tasting-text{font-size:13px;line-height:1.7;color:var(--text);margin-bottom:12px}.tasting-btn{padding:13px;font-size:15px}.tasting-langs{margin-bottom:12px}.plan-badge{font-size:11px;font-weight:700;border:1px solid var(--line);color:var(--text-muted);border-radius:999px;padding:2px 8px;vertical-align:middle}.plan-pro{border-color:var(--amber);color:var(--amber)}.legal-links{text-align:center;font-size:11px;margin-top:8px}.legal-links a{color:var(--text-muted);text-decoration:underline}.passkey-list{list-style:none;display:flex;flex-direction:column;margin-bottom:10px}.passkey-row{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line)}.passkey-row:last-child{border-bottom:none}.passkey-name{font-size:14px;font-weight:600;display:flex;flex-direction:column}.passkey-date{font-size:11px;font-weight:400;color:var(--text-muted)}.footer-links .ghost-btn{flex:1}.lesson-shortcuts{display:flex;flex-direction:column;gap:8px}.shortcut-btn{padding:12px;font-size:14px}.heatmap{display:flex;gap:3px;justify-content:space-between}.heatmap-col{display:flex;flex-direction:column;gap:3px;flex:1}.heatmap-cell{aspect-ratio:1;width:100%;min-width:10px;border-radius:3px}.heat-0{background:var(--bg-sunken)}.heat-1{background:#ffb45440}.heat-2{background:#ffb45480}.heat-3{background:#ffb454bf}.heat-4{background:var(--amber)}.heat-future{background:transparent}.heatmap-legend{display:flex;align-items:center;gap:4px;justify-content:flex-end;margin-top:8px;font-size:10px;color:var(--text-muted)}.heatmap-legend .heatmap-cell{width:10px;min-width:10px}.langstat-list{list-style:none;display:flex;flex-direction:column;gap:16px}.langstat-head{display:flex;align-items:center;gap:8px}.langstat-name{font-size:14px;font-weight:700}.langstat-xp{margin-left:auto;font-size:12px;color:var(--amber)}.langstat-metrics{display:flex;gap:14px;font-size:12px;color:var(--text-muted);margin-top:6px}.langstat-metrics b{color:var(--text)}.langstat-bar{position:relative;height:6px;background:var(--bg-sunken);border-radius:999px;margin-top:8px;overflow:hidden}.langstat-bar-learned,.langstat-bar-mastered{position:absolute;inset:0 auto 0 0;border-radius:999px}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}