:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;color:#17233a;background:#f3f7fb;--bg:#f3f7fb;--card:#fff;--text:#17233a;--muted:#6c7b93;--line:#e1e8f1;--blue:#3368e8;--blue-soft:#eaf0ff;--green:#15876b;--green-soft:#e3f8ee;--red:#c94254;--red-soft:#fff0f0}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #87a9ff;outline-offset:2px}.shell{width:min(100%,680px);margin:0 auto;padding:20px 18px calc(116px + env(safe-area-inset-bottom))}.topbar{display:flex;align-items:center;gap:12px;margin-bottom:26px}.brandmark{display:grid;place-items:center;width:42px;height:42px;flex:none;border-radius:14px;background:#315fe6;color:#fff;font-size:27px;font-weight:800;box-shadow:0 8px 18px #315fe633}.brand-title{font-size:18px;font-weight:800;line-height:1.2}.brand-sub{font-size:12px;color:var(--muted);margin-top:4px}.icon-button{margin-left:auto;display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line);border-radius:12px;background:var(--card);color:var(--text);font-size:20px}.eyebrow{display:inline-flex;align-items:center;gap:6px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.hero{padding:26px 24px;border-radius:26px;background:linear-gradient(135deg,#214ec8,#477ef5);color:#fff;box-shadow:0 18px 36px #2758d52c}.hero .eyebrow{color:#c9ddff}.hero h1{font-size:clamp(27px,7vw,38px);line-height:1.2;margin:14px 0 10px;letter-spacing:-.03em}.hero p{margin:0;color:#dce7ff;line-height:1.65;font-size:14px}.hero-row{display:flex;gap:10px;margin-top:24px}.hero-stat{flex:1;padding:12px 13px;border:1px solid #ffffff40;border-radius:15px;background:#ffffff16}.hero-stat strong{display:block;font-size:24px;line-height:1.1}.hero-stat span{font-size:11px;color:#dbe7ff}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin:29px 0 14px}.section-head h2{font-size:19px;margin:0}.section-head span{font-size:12px;color:var(--muted)}.action-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.action-card{min-height:135px;text-align:left;padding:18px;border:1px solid var(--line);border-radius:20px;background:var(--card);color:var(--text);box-shadow:0 5px 18px #1f38590a}.action-card:hover{border-color:#b9cafa}.action-card .emoji{font-size:27px}.action-card strong{display:block;font-size:16px;margin-top:11px}.action-card span{display:block;color:var(--muted);font-size:12px;line-height:1.45;margin-top:4px}.card{padding:20px;border:1px solid var(--line);border-radius:21px;background:var(--card);box-shadow:0 5px 18px #1f38590a}.filters{display:grid;grid-template-columns:1fr 1fr;gap:10px}.filter-label{font-size:12px;font-weight:700;color:var(--muted);margin:0 0 7px}.select,.search{width:100%;height:45px;border:1px solid var(--line);border-radius:12px;background:var(--card);color:var(--text);padding:0 12px}.search{margin-top:12px}.button{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:50px;padding:10px 16px;border:0;border-radius:13px;background:var(--blue);color:#fff;font-weight:800}.button:hover{filter:brightness(.96)}.button.secondary{background:var(--blue-soft);color:var(--blue)}.button.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}.button:disabled{opacity:.45;cursor:not-allowed}.stack{display:grid;gap:11px}.muted{color:var(--muted)}.small{font-size:12px;line-height:1.6}.question-top{display:flex;align-items:center;gap:8px;margin-bottom:18px}.pill{padding:6px 10px;border-radius:100px;background:var(--blue-soft);color:var(--blue);font-size:12px;font-weight:800}.question-counter{margin-left:auto;color:var(--muted);font-size:12px;font-weight:700}.progressbar{height:7px;overflow:hidden;border-radius:30px;background:#dfe7f5;margin-bottom:23px}.progressbar span{display:block;height:100%;border-radius:30px;background:var(--blue);transition:width .25s}.question-title{font-size:clamp(20px,5vw,25px);line-height:1.5;font-weight:800;margin:0 0 22px;white-space:pre-wrap}.option{display:flex;align-items:flex-start;gap:13px;width:100%;min-height:60px;text-align:left;padding:15px;border:1.5px solid var(--line);border-radius:15px;background:var(--card);color:var(--text);line-height:1.5}.option .letter{display:grid;place-items:center;width:25px;height:25px;flex:none;border-radius:8px;background:var(--blue-soft);color:var(--blue);font-weight:800;font-size:12px}.option.selected{border-color:var(--blue);background:#f0f5ff}.option.correct{border-color:#55be94;background:var(--green-soft)}.option.wrong{border-color:#e98692;background:var(--red-soft)}.option.selected.correct .letter,.option.correct .letter{background:var(--green);color:#fff}.option.wrong .letter{background:var(--red);color:#fff}.option:disabled{cursor:default}.question-actions{display:flex;gap:10px;margin-top:17px}.question-actions .button{flex:1}.answer-card{padding:18px;border-radius:15px;background:var(--blue-soft);border:1px solid #d7e3ff;margin-top:17px}.answer-card.good{background:var(--green-soft);border-color:#bee9d4}.answer-card.bad{background:var(--red-soft);border-color:#f5cfd5}.answer-card strong{display:block;margin-bottom:8px}.answer-card p{margin:0;color:var(--text);line-height:1.75;white-space:pre-wrap}.answer-card small{display:block;color:var(--muted);margin-top:9px}.rating{display:flex;gap:10px;margin-top:14px}.rating .button{flex:1}.list-row{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:14px 15px;border:1px solid var(--line);border-radius:13px;background:var(--card);color:var(--text)}.list-row strong{display:block;font-size:14px;line-height:1.4}.list-row span{display:block;color:var(--muted);font-size:12px;margin-top:4px}.list-row b{margin-left:auto;color:var(--blue)}.empty{text-align:center;padding:34px 18px;color:var(--muted)}.empty .symbol{font-size:35px;margin-bottom:10px}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat-tile{padding:20px;border:1px solid var(--line);border-radius:18px;background:var(--card)}.stat-tile strong{display:block;font-size:28px}.stat-tile span{font-size:12px;color:var(--muted)}.bottom-nav{position:fixed;z-index:10;left:0;right:0;bottom:0;display:flex;justify-content:center;gap:0;padding:8px max(8px,calc((100vw - 680px)/2)) calc(8px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:color-mix(in srgb,var(--card) 94%,transparent);backdrop-filter:blur(18px)}.bottom-nav button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;flex:1;min-height:50px;border:0;background:transparent;color:var(--muted);font-size:11px;font-weight:700}.bottom-nav button span{font-size:22px;line-height:1}.bottom-nav button.active{color:var(--blue)}.notice{margin:18px 0 0;color:var(--muted);font-size:12px;line-height:1.7}.theme-dark{--bg:#101827;--card:#1b2739;--text:#eef3fc;--muted:#a7b5c9;--line:#304258;--blue:#80a7ff;--blue-soft:#263c63;--green-soft:#173c32;--red-soft:#4d2b35}.theme-dark .hero{background:linear-gradient(135deg,#1d3e9f,#315ec2)}.theme-dark .option.selected{background:#253c64}.theme-dark .progressbar{background:#33455e}@media(min-width:700px){.shell{padding-top:34px}.bottom-nav{left:50%;right:auto;transform:translateX(-50%);width:680px;border:1px solid var(--line);border-radius:18px 18px 0 0}}@media(max-width:370px){.hero{padding:22px 19px}.action-card{padding:15px;min-height:125px}}