:root{--ink:#1d3430;--soft:#546b64;--green:#245f4e;--green2:#e9f3ee;--paper:#f6f7f3;--white:#fff;--line:#d9e0da;--amber:#fff5da;--amber-border:#dfba57}
*{box-sizing:border-box}html{color-scheme:light}body{margin:0;font:16px/1.65 system-ui,-apple-system,"Noto Sans TC",sans-serif;color:var(--ink);background:var(--paper)}button,input,textarea{font:inherit}button{cursor:pointer;min-height:44px;border-radius:10px}a{color:var(--green)}.skip{position:absolute;left:-9999px}.skip:focus{left:15px;top:10px;z-index:100;background:#fff;padding:8px}.topbar{background:#21463d;color:#fff}.topbar-inner{max-width:1080px;padding:14px 22px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:16px}.brand{color:#fff;text-decoration:none;display:flex;align-items:center;gap:12px;font-weight:800;font-size:18px;line-height:1.3}.brand small{display:block;color:#e4eee6;font-size:12px;font-weight:500;margin-top:5px}.brand-icon{display:grid;place-items:center;background:#d2e5d7;color:#21463d;width:42px;height:42px;border-radius:12px}.version{border:1px solid #83a598;padding:5px 10px;border-radius:20px;font-size:12px;white-space:nowrap}.layout{max-width:1080px;margin:auto;padding:28px 22px 50px}.intro{display:flex;align-items:end;justify-content:space-between;gap:25px;margin-bottom:20px}.eyebrow{color:var(--green);font-size:12px;font-weight:850;letter-spacing:.1em;margin:0 0 5px}h1{font-size:clamp(27px,5vw,39px);letter-spacing:-.03em;margin:0 0 5px}h2{font-size:22px;line-height:1.35;margin:0 0 8px}.intro p{margin:0;color:var(--soft)}.plain-link{font-size:13px;text-decoration:none;font-weight:700;white-space:nowrap}.summary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:22px 0}.stat,.daily-card,.workspace,.history{border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 5px 22px rgba(20,54,43,.035)}.stat{padding:15px 20px}.stat span,.stat small{display:block;color:var(--soft);font-size:12px}.stat strong{display:block;font-size:28px;letter-spacing:-.02em;margin:3px 0}.daily-card,.workspace,.history{padding:24px;margin:16px 0}.daily-head{display:flex;justify-content:space-between;gap:14px;align-items:start}.daily-head p:last-child{margin:0}.muted{color:var(--soft)}.status{font-size:12px;border-radius:99px;background:var(--green2);padding:5px 10px;white-space:nowrap}.mode-line{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:20px 0;font-size:14px}.segmented{display:flex;gap:5px;background:var(--paper);padding:4px;border-radius:12px}.segmented button{font-size:13px;min-height:38px;border:0;padding:6px 12px;background:transparent;color:var(--soft)}.segmented button[aria-pressed=true]{background:var(--green);color:white;box-shadow:0 2px 9px #aac4b6}.segmented button:disabled{opacity:.55;cursor:not-allowed}.phases{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));list-style:none;margin:0 0 18px;padding:0;gap:8px}.phases li{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:10px;font-size:12px;color:var(--soft)}.phases li strong{display:block;color:var(--ink);font-size:14px}.phases li.active{background:var(--green2);border-color:var(--green);color:var(--ink)}.phases li.done{opacity:.65}.timer-panel{display:flex;justify-content:space-between;gap:18px;align-items:center;background:var(--green2);border-radius:13px;padding:18px 20px}.timer-label{font-size:13px;color:var(--green);margin:0;font-weight:800}.timer{font-size:clamp(36px,6vw,52px);font-variant-numeric:tabular-nums;font-weight:800;line-height:1.2;margin:5px 0}.tiny{font-size:12px}.timer-panel .tiny{margin:0}.timer-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:end}.primary,.secondary{padding:10px 16px;font-size:14px;font-weight:800}.primary{background:var(--green);color:#fff;border:1px solid var(--green)}.secondary{background:#fff;color:var(--green);border:1px solid var(--green)}button:disabled{opacity:.45;cursor:not-allowed}.section-head{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-bottom:16px}.warning{padding:10px 14px;border:1px solid var(--amber-border);background:var(--amber);border-radius:10px;font-size:13px;margin:12px 0 18px}.question{border-left:4px solid #acd0be;padding:4px 16px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere;margin:16px 0;font-size:15px}.prompt-box{background:var(--paper);border-radius:12px;padding:15px 18px;margin:22px 0 14px}.prompt-box p{margin:6px 0 0}.answer-label{font-weight:800;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:15px}#answerStatus{font-weight:400;font-size:12px}textarea{display:block;width:100%;border:1px solid #aabbb0;border-radius:12px;padding:12px 14px;margin:8px 0 16px;resize:vertical;min-height:148px;line-height:1.7}details{border:1px solid var(--line);padding:14px;border-radius:11px;margin:18px 0}summary{cursor:pointer;font-weight:750}#referenceContent{white-space:pre-wrap;line-height:1.8;font-size:14px;margin:12px 0}.self-check{padding:16px;border-top:1px solid var(--line)}.self-check p{font-size:13px;margin:2px 0 10px}.ratings{display:flex;gap:8px;flex-wrap:wrap}.ratings button{padding:8px 13px;background:#fff;border:1px solid #aec0b5;font-size:13px}.ratings button.selected{background:var(--green);color:#fff;border-color:var(--green)}.links{display:flex;gap:18px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:16px;font-size:13px}.history-content{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px}.day-cell{padding:10px 4px;text-align:center;border-radius:10px;border:1px solid var(--line);font-size:12px}.day-cell strong{display:block}.day-cell.today{border-color:var(--green);background:var(--green2)}.day-cell.finished{background:#dff1e4}.notice{border:1px solid #d4b153;background:#fff5d9;border-radius:10px;padding:12px 14px;margin:10px 0}.history>.tiny{margin-bottom:0}footer{margin-top:34px;border-top:1px solid var(--line);padding-top:16px;font-size:12px;color:var(--soft)}:focus-visible{outline:3px solid #b49a39;outline-offset:3px}@media(max-width:680px){.layout{padding:18px 14px 36px}.topbar-inner{padding:12px 15px}.version{font-size:10px}.intro,.mode-line,.timer-panel{align-items:stretch;flex-direction:column}.intro .plain-link{align-self:start}.daily-card,.workspace,.history{padding:17px}.stat{padding:12px}.stat strong{font-size:22px}.stat span,.stat small{font-size:11px}.phases{grid-template-columns:repeat(2,minmax(0,1fr))}.timer-actions{justify-content:stretch}.timer-actions button{flex:1}.section-head{align-items:start}.history-content{grid-template-columns:repeat(7,minmax(0,1fr));gap:3px}.day-cell{font-size:10px;padding:8px 1px}.summary-grid{gap:6px}}

/* v2.5.1: study30-only record deletion controls */
.history-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.danger-outline,.danger{padding:10px 15px;font-size:14px;font-weight:800;border-radius:10px}
.danger-outline{background:#fff;color:#9b3030;border:1px solid #ae4b4b}
.danger{background:#9b3030;color:#fff;border:1px solid #9b3030}
.danger:hover:not(:disabled){background:#7b2020}
.clear-dialog{border:1px solid var(--line);border-radius:16px;width:min(520px,calc(100% - 28px));max-height:min(88vh,760px);overflow:auto;padding:24px;color:var(--ink);box-shadow:0 18px 65px #001a1433;background:var(--white)}
.clear-dialog::backdrop{background:#14231ed9}
.clear-dialog h2{margin:0 0 6px}
.clear-dialog p{font-size:14px;line-height:1.6}
.clear-options{border:1px solid var(--line);border-radius:12px;margin:15px 0;padding:10px 12px 12px}
.clear-options legend{font-weight:800;padding:0 5px}
.clear-options label{display:flex;align-items:flex-start;gap:10px;padding:10px 4px;cursor:pointer}
.clear-options label+label{border-top:1px solid var(--line)}
.clear-options input{margin-top:5px;accent-color:var(--green)}
.clear-options strong,.clear-options small{display:block}
.clear-options small{font-size:12px;color:var(--soft)}
.clear-confirm-label{display:block;font-weight:800;margin-top:16px}
#clearConfirmation{width:100%;min-height:44px;padding:10px 12px;border-radius:10px;border:1px solid #aabbb0;font-size:16px;margin-top:6px}
.clear-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}
@media(max-width:680px){.history-actions{width:100%;justify-content:stretch}.history-actions button{flex:1}.history .section-head{flex-wrap:wrap}.clear-dialog{padding:18px}.clear-actions button{flex:1}}
/* v2.5.2 smart-review dashboard */
.review-dashboard{border:1px solid var(--line);border-radius:16px;background:var(--white);padding:24px;margin:16px 0;box-shadow:0 5px 22px rgba(20,54,43,.035)}
.review-dashboard h3{font-size:16px;margin:4px 0 12px}
.insight-note{font-size:12px;color:var(--soft);border:1px solid var(--line);padding:5px 10px;border-radius:99px}
.insight-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin:16px 0 24px}
.insight-stats>div{border-radius:12px;padding:14px;background:var(--green2)}
.insight-stats span,.insight-stats strong{display:block}.insight-stats span{font-size:12px;color:var(--soft)}.insight-stats strong{font-size:22px}
.review-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.review-columns.lower{margin-top:25px;border-top:1px solid var(--line);padding-top:19px}
.review-list,.insights-list{display:grid;gap:9px}
.review-item{border:1px solid var(--line);background:#fff;border-radius:12px;padding:12px 13px;min-width:0}
.review-item-head{display:flex;align-items:flex-start;justify-content:space-between;gap:6px}
.review-item-head strong{font-size:13px;overflow-wrap:anywhere}.review-date{background:#eef3ee;border-radius:7px;padding:3px 6px;font-size:11px;white-space:nowrap;color:var(--green)}
.review-item p{margin:6px 0 0}.review-pick{border:1px solid var(--green);background:white;color:var(--green);min-height:34px;font-size:12px;font-weight:700;padding:5px 9px;margin-top:9px}
.insight-row,.topic-row{padding:10px 12px;border:1px solid var(--line);border-radius:10px;min-width:0}
.insight-row span{font-size:13px}.insight-row strong{float:right;font-size:12px}.insight-row small{display:block;font-size:11px;color:var(--soft)}
.meter{height:6px;background:#e4e9e5;margin:8px 0;border-radius:99px;overflow:hidden}.meter>div{height:100%;background:#45846d;border-radius:99px}
.topic-row strong,.topic-row span{display:block;overflow-wrap:anywhere}.topic-row strong{font-size:13px}.topic-row span{font-size:11px;color:var(--soft);margin-top:4px}
.empty-insight{padding:15px;border:1px dashed var(--line);border-radius:10px;color:var(--soft);font-size:13px}
.error-box{padding:12px 16px 20px;border-top:1px solid var(--line)}.error-box label{display:block;font-weight:700;font-size:14px;margin-bottom:8px}.error-box select{width:100%;max-width:420px;min-height:44px;padding:8px 11px;border-radius:10px;background:white;border:1px solid #aabbb0;font-size:14px}
@media(max-width:680px){.review-dashboard{padding:17px}.review-columns{grid-template-columns:1fr}.insight-stats>div{padding:10px}.insight-stats strong{font-size:19px}.insight-note{font-size:10px}.review-item-head{flex-wrap:wrap}}