@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;650;700;800&display=swap');
:root{--ink:#202d38;--muted:#74808b;--line:#e1e6e9;--green:#287861;--soft:#e8f1ed;--red:#b54c4c}*{box-sizing:border-box}body{margin:0;background:#f6f7f9;color:var(--ink);font:15px/1.65 Manrope,system-ui,sans-serif}button,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #699e8d;outline-offset:4px}header{max-width:1200px;margin:auto;height:100px;display:flex;align-items:center;gap:18px;padding:0 36px}#brand{color:inherit;text-decoration:none;display:flex;gap:14px;align-items:center;font-size:17px}.logo{background:var(--ink);color:white;border-radius:12px;padding:8px 11px;font-size:15px;letter-spacing:-1px}.logo span{color:#a6d8bb}.header-note{margin-left:32px;color:var(--muted);font-size:12px}#home{margin-left:auto}.quiet{background:transparent;color:var(--muted);padding:9px 0}.quiet:hover{color:var(--green)}main{max-width:1128px;margin:30px auto 80px;padding:0 36px;min-height:65vh}.eyebrow{font-size:11px;font-weight:800;letter-spacing:1.7px;color:var(--green);text-transform:uppercase}.hero{display:flex;align-items:center;justify-content:space-between;gap:30px;margin-bottom:36px}h1{font-size:clamp(32px,4vw,48px);line-height:1.2;letter-spacing:-2px;font-weight:650;margin:13px 0 17px}h1 span{color:var(--green)}.intro{color:var(--muted);max-width:570px;font-size:15px;margin:0}.hero-stamp{width:142px;height:142px;flex-shrink:0;border:1px solid #d3dfd8;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(8deg);color:var(--green);background:#edf3ef}.hero-stamp strong{font-size:40px;line-height:1.2;font-weight:600}.hero-stamp small{font-size:10px;letter-spacing:1.6px}.stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:16px;background:white;padding:22px 0;margin-bottom:40px}.stat{padding:0 26px;border-right:1px solid var(--line);display:flex;align-items:center;gap:14px}.stat:last-child{border:0}.stat strong{font-size:26px;font-weight:650}.stat span{font-size:12px;color:var(--muted)}.section-top{display:flex;align-items:center;justify-content:space-between;margin:20px 0 16px}h2{font-size:21px;letter-spacing:-.5px;margin:0}.section-top small{color:var(--muted);font-size:12px}.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.mode{background:#fff;border:1px solid var(--line);border-radius:19px;padding:26px;display:flex;flex-direction:column;position:relative}.mode.featured{background:#eaf1ed;border-color:#c5d9cd}.mode-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}.icon{width:43px;height:43px;display:grid;place-items:center;border-radius:12px;background:#f1f4f5;font-size:23px;color:#526979}.featured .icon{background:#d9e9df;color:var(--green)}.number{font-size:11px;color:#9ba6ad}.mode h3{font-size:21px;margin:0 0 8px;font-weight:650}.mode p{color:#74808b;font-size:13px;line-height:1.8;margin:0 0 20px;flex:1}.tag{font-size:10px;color:#667e73;background:#f4f7f5;border:1px solid #dce7e0;padding:3px 8px;border-radius:6px;align-self:flex-start;margin-bottom:25px}.mode button,.primary{padding:12px 20px;border-radius:10px;background:var(--ink);color:white;font-weight:600}.featured button,.primary{background:var(--green)}.mode button:hover,.primary:hover{filter:brightness(1.12)}.secondary{padding:11px 20px;background:white;border:1px solid var(--line);border-radius:10px;color:var(--ink)}.settings{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:20px 0;color:var(--muted);font-size:12px}select{background:white;border:1px solid var(--line);padding:8px 30px 8px 12px;border-radius:8px;color:var(--ink);max-width:100%}.note{border-left:2px solid #cddcd4;padding-left:15px;color:var(--muted);font-size:12px;margin:25px 0}.bottom-links{display:flex;gap:25px;flex-wrap:wrap}.bottom-links button{font-size:12px}.study{max-width:810px;margin:auto}.study-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;gap:15px}.pill{font-size:11px;background:var(--soft);color:var(--green);border-radius:7px;padding:5px 10px}.count{color:var(--muted);font-size:12px}.progress{height:4px;background:#e1e7e5;border-radius:5px;overflow:hidden;margin-bottom:24px}.progress i{display:block;background:var(--green);height:100%;transition:width .2s}.question{border:1px solid var(--line);background:white;border-radius:20px;padding:32px}.question h2{font-size:23px;line-height:1.55;letter-spacing:-.4px;font-weight:600;margin:18px 0 20px}.source{color:#8b969e;font-size:11px}.sql{font:13px/1.7 ui-monospace,SFMono-Regular,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:#f3f5f6;border:1px solid #e6eaed;padding:17px 20px;border-radius:10px;color:#3e586a;margin:18px 0 25px}.options{display:grid;gap:10px}.option{display:flex;align-items:center;gap:14px;width:100%;text-align:left;padding:15px;border:1px solid var(--line);border-radius:11px;background:white;color:var(--ink);font-size:14px;overflow-wrap:anywhere}.option span{flex:1}.letter{font-size:11px;border:1px solid #dce2e6;color:#85929b;border-radius:6px;min-width:28px;height:28px;display:grid;place-items:center;font-weight:500}.option:hover:not(:disabled){border-color:#7fa893;background:#f6faf7}.option.selected{border-color:var(--green);background:#eef6f1}.option.right{border-color:#80b49b;background:#eaf5ef;color:#246d50}.option.wrong{border-color:#d6a1a1;background:#fcf0f0;color:var(--red)}.option:disabled{opacity:1}.feedback{background:#edf6f0;border:1px solid #d7e6db;border-radius:12px;padding:18px 20px;margin-top:22px;font-size:13px}.feedback.bad{background:#fcf5f1;border-color:#ebdcd4}.feedback strong{font-size:14px}.feedback p{margin:8px 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p{color:var(--muted)}.result .actions{justify-content:center;flex-wrap:wrap}.review{padding:25px;background:white;border:1px solid var(--line);border-radius:15px;margin:14px 0}.review h3{font-size:15px;line-height:1.7;margin:0 0 12px}.review p{font-size:13px;margin:8px 0}.review .wrong-text{color:var(--red)}.review .right-text{color:var(--green)}footer{max-width:1128px;margin:0 auto;padding:22px 36px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:#929ca3;font-size:11px}.resume{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff;border:1px solid #c7d9cf;padding:16px 22px;border-radius:13px;margin-bottom:24px;font-size:13px}.resume button{padding:8px 15px}.library-item{border-bottom:1px solid var(--line);padding:18px 0}.library-item summary{cursor:pointer;font-weight:600}.library-item p{font-size:13px}dialog{border:1px solid var(--line);border-radius:16px;max-width:420px;padding:28px}dialog::backdrop{background:#202d3855}dialog p{font-size:14px}@media(max-width:760px){header{height:80px;padding:0 20px}.header-note{display:none}main{padding:0 20px;margin-top:20px}.hero-stamp{width:100px;height:100px}.hero-stamp strong{font-size:30px}.hero{gap:15px}.modes{grid-template-columns:1fr}.mode{padding:22px}.mode-top{margin-bottom:15px}.mode p{margin-bottom:15px}.tag{margin-bottom:18px}.stats{margin-bottom:28px;padding:18px 0}.stat{padding:0 14px;display:block}.stat strong{font-size:23px;display:block}.stat span{font-size:10px}.section-top{align-items:start;gap:10px}.section-top small{max-width:110px;text-align:right}.question{padding:22px}.question h2{font-size:19px}.option{font-size:12px;padding:12px;gap:10px}.actions{flex-wrap:wrap}.actions button{flex:1}footer{padding:20px;gap:15px;font-size:10px}.study-foot{font-size:10px}.resume{align-items:start}h1{letter-spacing:-1.2px}.hero-stamp 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