:root{color-scheme:light;--bg:#f3f6f8;--panel:#fff;--ink:#17212b;--muted:#64717d;--line:#d6e0e7;--main:#173f5f;--main2:#24658f;--soft:#e9f2f8;--ok:#126b3a;--okbg:#e8f6ed;--bad:#a32f2f;--badbg:#fdecec}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{margin:0;min-height:100dvh;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic UI",sans-serif;line-height:1.55;padding-bottom:calc(18px + env(safe-area-inset-bottom));overscroll-behavior-y:contain}
header{position:sticky;top:0;z-index:5;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;padding:calc(9px + env(safe-area-inset-top)) 12px 9px;background:color-mix(in srgb,var(--bg) 94%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
header h1{margin:0;font-size:19px;color:var(--main)}header p{margin:0;color:var(--muted);font-size:11px}.back{color:var(--main);font-weight:750;text-decoration:none}.fontButton{width:44px;min-height:42px;margin:0;padding:5px;font-size:14px}
main{max-width:680px;margin:auto;padding:13px}.panel{padding:17px;background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:0 4px 18px #173f5f0c}.hidden{display:none!important}
h2{margin:17px 0 8px;font-size:18px;color:var(--main)}button,.fileButton,select{font:inherit}button,.fileButton{width:100%;min-height:52px;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--ink);font-weight:700;touch-action:manipulation}button:active{transform:scale(.985)}.primary{background:var(--main);border-color:var(--main);color:#fff}
label{display:block;color:var(--muted);font-size:13px}select{width:100%;min-height:50px;margin-top:5px;padding:9px 12px;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--ink);font-size:16px}.dataStatus{padding:10px 12px;border-radius:12px;background:var(--soft);color:var(--main);font-size:13px;font-weight:700}.dataStatus.bad{background:var(--badbg);color:var(--bad)}
.guideLink{display:block;margin:10px 0;padding:10px 12px;border:1px solid var(--main2);border-radius:12px;background:var(--soft);color:var(--main);font-weight:750;text-align:center;text-decoration:none}
.today{display:flex;justify-content:space-between;align-items:center;margin:12px 0;padding:12px 14px;border-radius:13px;background:linear-gradient(135deg,var(--main),var(--main2));color:#fff}.today strong{font-size:22px}.startGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:13px}.start{display:grid;gap:1px;min-height:78px;padding:10px 5px}.start strong{font-size:20px}.start span{font-size:11px;color:var(--muted)}.start.primary span{color:#dceaf3}.resumeBox{margin:13px 0;padding:12px;border:1px solid #d18b26;border-radius:13px;background:#fff6e7;color:#754a0d}.resumeBox p{margin:0 0 8px;font-size:13px}.resumeActions{display:grid;grid-template-columns:1fr 1fr;gap:7px}.resumeActions button{min-height:46px;padding:8px;font-size:13px}.dataHelp{margin-top:18px;color:var(--muted);font-size:13px}.fileButton{display:block;margin-top:10px;text-align:center}.fileButton input{display:none}
.quizHead{position:sticky;top:calc(62px + env(safe-area-inset-top));z-index:4;display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:8px;padding:7px 2px;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(10px);font-size:13px;color:var(--muted)}.quizHead #timer{color:var(--main);font-variant-numeric:tabular-nums}.quizHead #stop{width:auto;min-height:38px;padding:5px 9px;font-size:12px}.bar{height:7px;margin-bottom:10px;overflow:hidden;border-radius:99px;background:var(--line)}.bar>div{height:100%;width:0;background:var(--main2);transition:width .2s}
.meta{font-size:13px;color:var(--main2);font-weight:750}.question{margin:9px 0 16px;font-size:20px;line-height:1.6;font-weight:750}.options{display:grid;gap:10px}.option{min-height:62px;text-align:left;font-size:17px;line-height:1.5}.option.unknown{border-style:dashed;background:var(--soft)}.option:disabled{opacity:1}.option.correct{border-color:var(--ok);background:var(--okbg);color:var(--ok)}.option.wrong{border-color:var(--bad);background:var(--badbg);color:var(--bad)}
.answer{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);scroll-margin-top:110px}.result{font-size:21px;font-weight:850}.result.ok{color:var(--ok)}.result.bad{color:var(--bad)}.correctAnswer{margin:8px 0;padding:11px 13px;border-radius:12px;background:var(--main);color:#fff}.miniExplain{margin:10px 0;padding:12px;border-radius:12px;background:var(--soft);white-space:pre-line}.wrongWhy{border-left:4px solid var(--bad)}.examPoint{border-left:4px solid #d18b26}.next{position:sticky;bottom:calc(8px + env(safe-area-inset-bottom));z-index:5;margin-top:12px;box-shadow:0 5px 20px #173f5f33}.finish{text-align:center}.finish strong{display:block;margin:10px;font-size:30px;color:var(--main)}footer{text-align:center;padding:14px;color:var(--muted);font-size:11px}
.phoneComplete{margin:9px 0;padding:10px 12px;border-radius:11px;background:var(--okbg);color:var(--ok);font-size:13px}.portableStudy summary{cursor:pointer;font-weight:750;color:var(--main)}.portableStudy ul{padding-left:20px}.portableStudy li{margin:8px 0}.portableRef{color:var(--muted);font-size:12px}
html[data-font-size="large"] body{font-size:18px}html[data-font-size="large"] .question{font-size:23px}html[data-font-size="large"] .option{font-size:19px}html[data-font-size="xlarge"] body{font-size:20px}html[data-font-size="xlarge"] .question{font-size:26px}html[data-font-size="xlarge"] .option{font-size:21px}
@media(max-width:380px){main{padding:9px}.panel{padding:14px}.startGrid{gap:5px}.start strong{font-size:18px}.question{font-size:18px}}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#111820;--panel:#1a232c;--ink:#edf2f5;--muted:#abb6bf;--line:#39444d;--main:#8dc5ed;--main2:#8dc5ed;--soft:#243748;--ok:#7ed49b;--okbg:#173625;--bad:#ff9c9c;--badbg:#422121}.resumeBox{background:#372b18;color:#ffd58c;border-color:#9f6d26}}