:root{--bg:#f5f6f8;--surface:#fff;--text:#17181a;--muted:#737982;--line:#dfe3e8;--accent:#315efb;--accent-soft:#eef2ff;--ok:#167447;--ok-bg:#eaf7f0;--bad:#b42318;--bad-bg:#fff0ee}
@media(prefers-color-scheme:dark){:root{--bg:#101215;--surface:#191c20;--text:#f4f5f7;--muted:#9ca3ad;--line:#32373e;--accent:#8aa7ff;--accent-soft:#202a47;--ok:#6bdca3;--ok-bg:#183527;--bad:#ff938b;--bad-bg:#3b211f}}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden}body{background:var(--bg);color:var(--text);font:15px/1.35 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-text-size-adjust:100%;touch-action:manipulation}button{font:inherit;-webkit-tap-highlight-color:transparent}
main{height:100dvh;max-width:720px;margin:0 auto;padding:max(10px,env(safe-area-inset-top)) 12px max(10px,env(safe-area-inset-bottom));display:grid;grid-template-rows:auto auto minmax(0,1fr) auto auto;gap:8px}
.top{display:flex;align-items:center;justify-content:space-between;gap:10px;min-width:0}.brand{font-size:13px;font-weight:700;white-space:nowrap;color:var(--muted);letter-spacing:.01em}.toolbar{display:flex;gap:5px;min-width:0}.plain{border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:9px;padding:6px 9px;min-height:32px;cursor:pointer;font-size:12px;font-weight:650}.plain:disabled{opacity:.4}.plain:focus-visible,.choice:focus-visible{outline:3px solid var(--accent-soft);outline-offset:1px}
.status-row{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;color:var(--muted);font-size:11px;min-width:0}.status-left,.status-right{white-space:nowrap}.status-center{display:flex;justify-content:center;gap:10px;min-width:0;white-space:nowrap}.status-center b{color:var(--text);font-size:12px}.secondary-stat{display:inline}.progress{height:3px;background:var(--line);border-radius:99px;overflow:hidden;grid-column:1/-1;margin-top:1px}.progress>div{height:100%;width:0;background:var(--accent);transition:width .18s ease}
.quiz{min-height:0;display:grid;grid-template-rows:minmax(0,1fr) auto auto;gap:7px}.phrase-wrap{min-height:0;display:flex;align-items:center;justify-content:center;padding:4px 8px;text-align:center}.phrase{max-width:650px;font-size:clamp(25px,7vw,36px);line-height:1.16;font-weight:760;letter-spacing:-.025em;text-wrap:balance}.phrase.compact{font-size:clamp(22px,6vw,30px)}.hint-row{display:grid;grid-template-columns:1fr 1fr;gap:7px}.hint-btn{border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:10px;min-height:34px;padding:5px 8px;font-size:12px;font-weight:700;cursor:pointer}.hint-btn:active{background:var(--accent-soft);color:var(--text)}
.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.choice{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:12px;min-height:49px;padding:7px 8px;cursor:pointer;font-weight:730;font-size:15px}.choice:active:not(:disabled){transform:scale(.985)}.choice.ok{border-color:var(--ok);background:var(--ok-bg);color:var(--ok)}.choice.bad{border-color:var(--bad);background:var(--bad-bg);color:var(--bad)}.choice:disabled{opacity:1;cursor:default}
#fb{display:flex;align-items:center;min-height:44px;border-radius:10px;padding:7px 10px;background:transparent;font-size:12px;line-height:1.25;color:var(--muted);overflow:hidden}#fb:empty{visibility:hidden}#fb b{color:var(--text);font-size:12px}.muted{color:var(--muted)}
#next{width:100%;min-height:46px;border:0;border-radius:12px;background:var(--accent);color:#fff;font-size:15px;font-weight:760;cursor:pointer;padding:9px 14px}#next:disabled{background:var(--line);color:var(--muted);cursor:default}dialog{width:min(355px,calc(100% - 28px));border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--text);padding:0;box-shadow:0 18px 60px rgba(0,0,0,.22)}dialog::backdrop{background:rgba(0,0,0,.38);backdrop-filter:blur(2px)}.hint-card{padding:16px}.hint-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.hint-head h2{font-size:16px;margin:0}.close-hint{border:0;background:var(--bg);color:var(--muted);border-radius:8px;width:32px;height:32px;font-size:20px;line-height:1;cursor:pointer}.tense-lines{display:grid;gap:8px}.tense-line{display:grid;grid-template-columns:86px 1fr;gap:8px;align-items:start;font-size:13px}.tense-line span:first-child{color:var(--muted)}.cheat{width:100%;border-collapse:collapse;font-size:11px}.cheat th,.cheat td{padding:7px 5px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.cheat th{color:var(--muted);font-weight:700}.cheat td:first-child{font-weight:800;white-space:nowrap}.cheat tr:last-child td{border-bottom:0}.summary-card{padding:16px;max-height:min(620px,82dvh);display:flex;flex-direction:column}.summary-meta{display:flex;flex-wrap:wrap;gap:6px;margin:-2px 0 10px}.summary-chip{border:1px solid var(--line);border-radius:999px;padding:4px 7px;font-size:11px;color:var(--muted)}.error-list{overflow:auto;overscroll-behavior:contain;display:grid;gap:7px;padding-right:2px;min-height:0}.error-item{border:1px solid var(--line);border-radius:10px;padding:9px 10px;background:var(--bg)}.error-q{font-size:12px;font-weight:700;line-height:1.3;margin-bottom:5px}.error-answer{font-size:11px;color:var(--muted);display:flex;gap:5px;flex-wrap:wrap}.wrong-answer{color:var(--bad)}.right-answer{color:var(--ok)}.summary-empty{font-size:13px;color:var(--muted);padding:12px 0}.summary-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:12px}.summary-action{border:1px solid var(--line);border-radius:10px;min-height:40px;background:transparent;color:var(--text);font-weight:700;cursor:pointer}.summary-action.primary{border-color:var(--accent);background:var(--accent);color:#fff}.summary-action:disabled{opacity:.4;cursor:default}
@media(prefers-color-scheme:dark){#next:not(:disabled){color:#111}}
@media(min-width:600px){main{padding-left:20px;padding-right:20px}.choices{grid-template-columns:repeat(3,1fr)}.choice{min-height:54px}.phrase{font-size:38px}}
@media(max-height:700px){main{gap:5px;padding-top:7px;padding-bottom:7px}.brand{font-size:12px}.plain{min-height:29px;padding:4px 8px}.phrase{font-size:clamp(22px,6.2vw,30px)}.choice{min-height:44px}#fb{min-height:36px;padding:4px 8px}#next{min-height:42px}}
/* Visual grammar: blue always means condition; purple always means result. */
:root{--condition:#245bd5;--condition-bg:#edf3ff;--result:#833ab3;--result-bg:#f6edfc}
@media(prefers-color-scheme:dark){:root{--condition:#9abaff;--condition-bg:#1c2c4a;--result:#d9a8ff;--result-bg:#342144}}
[hidden]{display:none!important}html,body{overflow:auto}main{min-height:510px}button:focus-visible,.import-label:focus-within{outline:3px solid var(--accent);outline-offset:3px}#fb{flex-direction:column;align-items:flex-start;justify-content:center;gap:3px;min-height:53px}dialog{width:min(470px,calc(100% - 24px));max-height:90dvh;overflow:auto;overscroll-behavior:contain}dialog h2{line-height:1.2}#cheatDialog{width:min(740px,calc(100% - 24px))}.hint-head{position:relative}.close-hint{flex-shrink:0;min-width:36px;min-height:36px}.condition{background:var(--condition-bg);color:var(--condition)}.result{background:var(--result-bg);color:var(--result)}.clause-condition{color:var(--condition);text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:6px}.clause-result{color:var(--result);text-decoration:underline dotted;text-decoration-thickness:3px;text-underline-offset:6px}.clause-card{padding:12px;border-radius:12px;border-inline-start:3px solid currentColor}.clause-card small,.time-event small{font-size:10px;font-weight:800;letter-spacing:.06em}.clause-card p{font-size:17px;font-weight:650;margin:7px 0;line-height:1.4}.clause-card b{font-size:12px}.tense-lines{gap:10px}.hint-note,.share-note{font-size:12px;line-height:1.5;color:var(--muted);margin:10px 0}.time-map{padding:12px 0 0}.time-axis{display:flex;justify-content:space-between;padding:0 4%;font-size:9px;font-weight:800;color:var(--muted);letter-spacing:.08em}.time-diagram{width:100%;height:auto;display:block;max-height:95px}.axis-line{stroke:var(--line);stroke-width:1;stroke-dasharray:3 3}.time-connection{stroke:var(--muted);stroke-width:2;stroke-dasharray:4 3}.condition-dot{fill:var(--condition)}.result-dot{fill:var(--result)}.condition-band{stroke:var(--condition);stroke-width:5;opacity:.4;stroke-linecap:round}.result-band{stroke:var(--result);stroke-width:5;opacity:.4;stroke-linecap:round}.time-diagram text{font:700 9px system-ui;fill:var(--muted)}.time-events{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px}.time-event{border-radius:9px;padding:8px}.time-event strong{display:block;font-size:12px;margin-top:3px}.time-arrow{font-size:20px;color:var(--muted)}.time-map>p{font-size:11px;line-height:1.45;color:var(--muted);margin-bottom:0}.pattern-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.pattern-card{border:1px solid var(--line);border-radius:12px;padding:12px;min-width:0}.pattern-card h3{font-size:14px;margin:0 0 10px}.pattern-forms{display:grid;grid-template-columns:1fr 1fr;gap:6px;font-size:10px}.pattern-forms>span{padding:7px;border-radius:7px}.pattern-forms b{display:block;font-size:11px;margin-top:3px;line-height:1.4}.score-hero{display:grid;gap:4px;padding:16px;border-radius:14px;background:var(--accent-soft);text-align:center}.score-hero strong{font-size:44px;line-height:1.1;letter-spacing:-.04em;color:var(--accent)}.score-hero>span{font-size:12px;color:var(--muted)}.shared-progress{margin-top:14px;height:6px;background:var(--line);border-radius:99px;overflow:hidden}.shared-progress>span{display:block;height:100%;background:var(--accent)}.type-scores{display:grid;gap:10px;margin:16px 0}.type-scores>div{display:grid;grid-template-columns:55px 1fr 55px;gap:10px;align-items:center;font-size:12px}.type-scores b{text-align:right;font-variant-numeric:tabular-nums}.type-scores meter{width:100%;height:12px;accent-color:var(--accent)}.backup-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}.import-label{display:flex;align-items:center;justify-content:center;text-align:center;cursor:pointer}.import-label input{display:block!important;width:100%;height:100%;opacity:0;position:absolute;inset:0;cursor:pointer}.import-label{position:relative}#shareLink{margin-top:10px;width:100%;height:85px;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--text);padding:8px;font:12px/1.4 monospace;resize:vertical}.hint-btn[aria-pressed=true]{background:var(--condition-bg);color:var(--condition);border-color:var(--condition)}
@media(max-width:520px){.pattern-grid{grid-template-columns:1fr}.secondary-stat{display:none}.status-row{grid-template-columns:auto 1fr auto}.brand{font-size:11px}.top{gap:4px}.plain{padding:6px 7px;font-size:11px}.toolbar{gap:4px}.status-center{gap:4px}}
@media(max-width:359px){.brand{max-width:88px;white-space:normal;font-size:11px}.status-right{display:none}.status-row{grid-template-columns:auto 1fr}.phrase{font-size:25px}.plain{padding:6px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}}