:root{--ink:#151b1a;--paper:#f3f0e9;--cream:#e9e4d8;--mint:#b9e5d2;--green:#15715f;--lime:#d6ed70;--coral:#ec745e;--muted:#69716e;--line:#d5d2c9;--white:#fff;--shadow:0 20px 60px rgba(24,33,30,.11)}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Manrope','Gowun Dodum',sans-serif}.noise{position:fixed;inset:0;pointer-events:none;opacity:.03;z-index:99;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}.topbar{height:82px;padding:0 max(4vw,30px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(243,240,233,.91);backdrop-filter:blur(14px);z-index:20}.brand{display:flex;align-items:center;gap:12px;border:0;background:none;text-align:left;cursor:pointer}.brand-mark{width:42px;height:42px;background:var(--ink);color:var(--lime);border-radius:50%;display:grid;place-items:center;font-weight:800}.brand b,.brand small{display:block}.brand small{font-size:9px;letter-spacing:1.8px;margin-top:3px;color:var(--muted)}nav{display:flex;gap:8px}.nav-btn{border:0;background:none;padding:11px 15px;color:var(--muted);font-weight:700;cursor:pointer;border-radius:30px}.nav-btn.active{background:var(--ink);color:white}.streak{font-size:12px;font-weight:700}.streak span{color:var(--coral);margin-right:6px}.view{display:none}.view.active{display:block}.hero{min-height:580px;padding:65px max(7vw,50px);display:grid;grid-template-columns:1fr 1fr;align-items:center;overflow:hidden}.eyebrow{font-size:11px;letter-spacing:2.5px;font-weight:800;color:var(--green);margin:0 0 18px}.hero h1,.page-head h1,.narrow-view>h1{font-size:clamp(48px,5.5vw,80px);line-height:1.03;letter-spacing:-4px;margin:0}.hero h1 em,.page-head em{font-style:normal;color:var(--green);font-family:'Gowun Dodum'}.hero-desc,.lead{color:var(--muted);line-height:1.8;margin:28px 0}.hero-actions{display:flex;gap:12px}.btn{border:0;border-radius:4px;padding:15px 20px;font-weight:800;cursor:pointer;font-family:inherit;transition:.2s}.btn:hover{transform:translateY(-2px)}.btn.primary{background:var(--green);color:white}.btn.secondary{background:var(--lime);color:var(--ink)}.btn.ghost{background:transparent;border:1px solid #b9bbb5}.btn.dark{background:var(--ink);color:white}.btn.full{width:100%}.hero-visual{height:430px;position:relative}.core{position:absolute;left:50%;top:49%;transform:translate(-50%,-50%);width:180px;height:180px;background:var(--ink);border-radius:50%;color:white;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 0 0 26px rgba(185,229,210,.35)}.core span{letter-spacing:5px;font-size:10px}.core b{font-size:30px;color:var(--lime)}.orbit{position:absolute;border:1px solid #aeb9b4;border-radius:50%;left:50%;top:50%;transform:translate(-50%,-50%) rotate(-20deg)}.orbit-a{width:420px;height:260px}.orbit-b{width:310px;height:390px}.data-card{position:absolute;background:white;border:1px solid var(--line);padding:18px 22px;box-shadow:var(--shadow);z-index:2}.data-card span{display:block;color:var(--muted);font-size:11px}.data-card b{font-size:27px}.card-a{left:4%;top:18%;transform:rotate(-4deg)}.card-a i{display:block;width:80px;height:4px;background:linear-gradient(90deg,var(--coral) 72%,#ddd 72%);margin-top:10px}.card-b{right:4%;bottom:14%;transform:rotate(5deg)}.dot{position:absolute;width:12px;height:12px;border-radius:50%;background:var(--coral)}.d1{left:25%;bottom:12%}.d2{right:20%;top:12%;background:var(--lime)}.d3{right:12%;top:44%;background:var(--green);width:7px;height:7px}.dashboard-section{background:var(--ink);color:white;padding:80px max(7vw,50px)}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:35px}.section-head h2,.progress-panel h2{font-size:35px;margin:0}.section-head>p{color:#a4aaa8}.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.mode-card{min-height:310px;background:#222a28;padding:28px;border:1px solid #35403d;position:relative;cursor:pointer;transition:.2s}.mode-card:hover{transform:translateY(-5px);border-color:var(--mint)}.mode-card.featured{background:var(--mint);color:var(--ink)}.mode-icon{width:48px;height:48px;background:var(--green);color:white;display:grid;place-items:center;font-size:24px;border-radius:50%}.mode-icon.warm{background:var(--lime);color:var(--ink)}.mode-icon.coral{background:var(--coral)}.mode-card h3{font-size:26px;margin:26px 0 10px}.mode-card p{font-family:'Gowun Dodum';color:#aab1af;line-height:1.6}.mode-card.featured p{color:#4e625b}.tag,.count-badge{position:absolute;right:22px;top:22px;background:var(--ink);color:var(--lime);font-size:10px;padding:6px 9px;border-radius:20px}.count-badge{background:var(--coral);color:white;font-size:14px}.mode-meta{display:flex;gap:8px}.mode-meta span{font-size:10px;border:1px solid #829a91;padding:5px 7px}.text-btn{position:absolute;bottom:25px;left:28px;background:none;border:0;color:inherit;font-weight:800;cursor:pointer}.mini-bars{display:grid;gap:8px;margin-top:20px}.mini-bars i{height:4px;width:var(--w);background:var(--lime)}.weak-preview{color:#aab1af;font-size:11px;margin-top:20px}.progress-panel{margin:50px max(7vw,50px);padding:35px 45px;background:var(--cream);display:grid;grid-template-columns:1.7fr repeat(3,.7fr) auto;gap:25px;align-items:center}.progress-panel p{color:var(--muted);font-size:12px}.stat{border-left:1px solid #c9c5bb;padding-left:25px}.stat span{display:block;font-size:11px;color:var(--muted)}.stat b{font-size:30px}.stat small{font-size:13px}.round-btn{width:48px;height:48px;border-radius:50%;border:0;background:var(--ink);color:white;cursor:pointer}.narrow-view{max-width:1200px;margin:auto;padding:60px 35px 100px}.back{border:0;background:none;font-weight:800;color:var(--muted);cursor:pointer;margin-bottom:35px}.narrow-view>h1{font-size:58px}.setup-layout{display:grid;grid-template-columns:1fr 330px;gap:50px;margin-top:45px}.setup-main{display:grid;gap:20px}.setup-block{background:white;padding:28px;border:1px solid var(--line)}.setup-block>label{font-weight:800;display:block;margin-bottom:20px}.segmented{display:flex;gap:10px}.segmented button,.subject-options button{border:1px solid var(--line);background:var(--paper);padding:13px 18px;font-weight:700;cursor:pointer}.segmented button.active,.subject-options button.active{background:var(--ink);color:white}.subject-options{display:grid;grid-template-columns:1fr 1fr;gap:8px}.reveal-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.choice{padding:20px;text-align:left;border:1px solid var(--line);background:var(--paper);cursor:pointer}.choice b,.choice span{display:block}.choice span{font-size:11px;color:var(--muted);margin-top:7px;line-height:1.5}.choice.active{border:2px solid var(--green);background:#edf7f2}.setup-summary{background:var(--ink);color:white;padding:30px;height:max-content;position:sticky;top:110px}.setup-summary>span{font-size:10px;letter-spacing:2px;color:var(--lime)}.setup-summary>b{display:block;font-size:25px;margin:13px 0 30px}.setup-summary>div{display:flex;justify-content:space-between;border-top:1px solid #3e4644;padding:20px 0}.setup-summary small{color:#a8afad}.quiz-view{min-height:calc(100vh - 82px);background:#ebe7df;padding-bottom:50px}.quiz-top{height:70px;padding:0 4vw;display:grid;grid-template-columns:1fr 1fr 1fr;align-items:center}.quiz-title{text-align:center}.quiz-title span{font-size:11px;color:var(--muted);margin-right:8px}.timer{text-align:right;font-weight:800;font-variant-numeric:tabular-nums}.progress-line{height:4px;background:#d3d0c9}.progress-line i{display:block;height:100%;width:0;background:var(--green);transition:.3s}.quiz-layout{max-width:1200px;margin:40px auto;display:grid;grid-template-columns:1fr 270px;gap:25px;padding:0 25px}.question-panel,.answer-sheet{background:white;border:1px solid var(--line)}.question-panel{padding:45px}.question-meta span{font-size:10px;padding:5px 8px;background:var(--cream);margin-right:5px}.question-panel h2{font-family:'Gowun Dodum';font-size:25px;line-height:1.6;margin:25px 0}.question-panel h2>span:first-child{font-family:'Manrope';color:var(--green)}.options{display:grid;gap:10px}.option{border:1px solid var(--line);background:#faf9f6;padding:17px 18px;text-align:left;cursor:pointer;font-family:'Gowun Dodum';font-size:16px;display:flex;gap:12px;line-height:1.5}.option i{font-style:normal;font-family:'Manrope';font-size:12px;width:25px;height:25px;border-radius:50%;border:1px solid #bbb;display:grid;place-items:center;flex:none}.option.selected{border:2px solid var(--green);background:#edf7f2}.option.correct{border-color:var(--green);background:#dcf3e9}.option.wrong{border-color:var(--coral);background:#fdeae5}.explanation{display:none;margin-top:22px;padding:23px;background:var(--cream);border-left:4px solid var(--green)}.explanation.show{display:block}.explanation h3{margin:8px 0}.explanation p{font-family:'Gowun Dodum';line-height:1.7}.result-label{font-size:12px;font-weight:800}.concept-chip{font-size:11px;color:var(--green);font-weight:800}.question-actions{display:flex;gap:10px;margin-top:28px}.question-actions #next-question{margin-left:auto}.answer-sheet{padding:22px;height:max-content;position:sticky;top:105px}.sheet-head{display:flex;justify-content:space-between}.sheet-head b{font-size:12px;color:var(--green)}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin:20px 0}.number-grid button{aspect-ratio:1;border:1px solid var(--line);background:var(--paper);cursor:pointer;font-size:11px}.number-grid button.done{background:var(--mint)}.number-grid button.current{outline:2px solid var(--ink)}.legend{display:flex;gap:15px;font-size:10px;color:var(--muted);margin-bottom:20px}.legend i{display:inline-block;width:8px;height:8px;margin-right:4px}.legend .done{background:var(--mint)}.legend .current{border:1px solid var(--ink)}.result-hero{display:flex;justify-content:space-between;align-items:center;background:var(--ink);color:white;padding:50px;margin-bottom:18px}.result-hero h1{font-size:45px;margin:0}.result-hero p:last-child{color:#aeb5b2}.score-ring{width:160px;height:160px;border-radius:50%;display:grid;place-content:center;text-align:center;background:conic-gradient(var(--lime) var(--score),#35403d 0);position:relative}.score-ring:before{content:"";position:absolute;inset:10px;background:var(--ink);border-radius:50%}.score-ring>*{position:relative}.score-ring span,.score-ring small{font-size:10px;color:#aaa}.score-ring b{font-size:48px}.result-stats{display:grid;grid-template-columns:repeat(4,1fr);background:white;border:1px solid var(--line)}.result-stats div{padding:25px;border-right:1px solid var(--line)}.result-stats span{display:block;font-size:11px;color:var(--muted)}.result-stats b{font-size:27px}.analysis-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;margin-top:18px}.analysis-card{background:white;padding:28px;border:1px solid var(--line)}.analysis-card h3{margin-top:0}.analysis-row{display:grid;grid-template-columns:140px 1fr 45px;align-items:center;gap:12px;font-size:12px;margin:14px 0}.analysis-row i{height:7px;background:var(--cream)}.analysis-row i span{display:block;height:100%;background:var(--green)}.recommend-box{background:var(--mint);padding:20px}.recommend-box b,.recommend-box span{display:block}.recommend-box span{font-family:'Gowun Dodum';margin-top:8px}.review-head{display:flex;justify-content:space-between;align-items:end;margin-top:55px}.review-head h2{margin:0}.review-list{display:grid;gap:10px;margin-top:20px}.review-item{background:white;border:1px solid var(--line);padding:22px}.review-item summary{cursor:pointer;font-family:'Gowun Dodum';font-weight:700}.review-item summary span{font-family:'Manrope';font-size:10px;margin-right:10px;padding:4px 7px}.review-item.correct summary span{background:var(--mint)}.review-item.wrong summary span{background:#f8c9bf}.review-detail{font-family:'Gowun Dodum';line-height:1.7;color:#49504e;padding:15px 0 0}.page-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:45px}.page-head h1{font-size:58px}.page-head>p{font-family:'Gowun Dodum';color:var(--muted);line-height:1.7}.note-tabs{display:flex;gap:7px;border-bottom:1px solid var(--line);margin-bottom:25px}.note-tabs button{border:0;background:none;padding:15px 18px;font-weight:800;color:var(--muted);cursor:pointer}.note-tabs button.active{color:var(--green);border-bottom:3px solid var(--green)}.note-hero{background:var(--mint);padding:35px;margin-bottom:15px}.note-hero h2{font-size:34px;margin:0 0 8px}.note-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.note-card{background:white;border:1px solid var(--line);padding:28px}.note-card .num{color:var(--coral);font-size:10px;font-weight:800}.note-card h3{font-size:21px}.note-card p,.note-card li{font-family:'Gowun Dodum';line-height:1.7;color:#4f5855}.formula{background:var(--ink);color:var(--lime);padding:12px 15px;font-family:monospace;font-size:13px}.record-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:25px}.record-summary>div{background:var(--ink);color:white;padding:25px}.record-summary span{font-size:11px;color:#adb4b1}.record-summary b{display:block;font-size:31px;margin-top:5px}.record-list{display:grid;gap:10px}.record-item{display:grid;grid-template-columns:1.4fr repeat(3,.6fr);background:white;border:1px solid var(--line);padding:20px;align-items:center}.record-item small{display:block;color:var(--muted)}.empty{padding:60px;text-align:center;background:white;color:var(--muted)}.danger{color:var(--coral)!important;border-color:var(--coral)!important}.toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,100px);background:var(--ink);color:white;padding:13px 20px;font-size:12px;opacity:0;transition:.3s;z-index:100}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:850px){.topbar nav{display:none}.streak{display:none}.hero{grid-template-columns:1fr;padding:50px 25px}.hero-visual{height:330px}.mode-grid,.setup-layout,.quiz-layout,.analysis-grid,.note-grid{grid-template-columns:1fr}.progress-panel{margin:25px;grid-template-columns:1fr 1fr}.progress-panel>div:first-child{grid-column:1/-1}.answer-sheet{position:static}.setup-summary{position:static}.page-head,.section-head{display:block}.result-hero{gap:20px}.result-hero h1{font-size:30px}.score-ring{width:125px;height:125px;flex:none}.result-stats{grid-template-columns:1fr 1fr}.record-item{grid-template-columns:1fr 1fr;gap:12px}.question-panel{padding:25px}.narrow-view{padding:40px 20px}.page-head h1,.narrow-view>h1{font-size:42px;letter-spacing:-2px}.subject-options,.reveal-options{grid-template-columns:1fr}}
@media(max-width:520px){.hero h1{font-size:48px}.hero-visual{transform:scale(.8);margin:-30px}.mode-grid{grid-template-columns:1fr}.dashboard-section{padding:55px 20px}.progress-panel{grid-template-columns:1fr}.stat{border-left:0;border-top:1px solid #ccc;padding:15px 0}.quiz-top{grid-template-columns:1fr 1fr}.quiz-title{display:none}.question-actions{flex-wrap:wrap}.question-actions .btn{flex:1}.result-hero{display:block}.score-ring{margin:25px auto 0}.note-tabs{overflow:auto}.segmented{flex-wrap:wrap}}

/* Searchable concept library */
.concept-search-wrap{height:68px;background:white;border:2px solid var(--ink);display:flex;align-items:center;padding:0 20px;gap:13px;box-shadow:6px 6px 0 var(--mint);margin-bottom:30px;position:sticky;top:96px;z-index:10}.concept-search-wrap>span{font-size:28px;color:var(--green)}.concept-search-wrap input{border:0;outline:0;background:transparent;font-family:'Gowun Dodum';font-size:17px;flex:1;min-width:0}.concept-search-wrap input::-webkit-search-cancel-button{display:none}.concept-search-wrap button{border:0;background:var(--cream);width:32px;height:32px;border-radius:50%;cursor:pointer;font-size:18px;opacity:0;pointer-events:none}.concept-search-wrap button.visible{opacity:1;pointer-events:auto}.note-toolbar{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);margin-bottom:38px}.note-toolbar .note-tabs{border:0;margin:0}.note-toolbar>b{font-size:11px;color:var(--muted);white-space:nowrap}.concept-group{margin-bottom:60px}.concept-group-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:18px}.concept-group-head span{font-size:10px;font-weight:800;color:var(--coral);letter-spacing:1.5px}.concept-group-head h2{font-size:30px;margin:5px 0 0}.concept-group-head>b{width:42px;height:42px;background:var(--ink);color:var(--lime);border-radius:50%;display:grid;place-items:center}.concept-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.concept-card{background:white;border:1px solid var(--line);padding:24px;display:flex;flex-direction:column;min-height:330px;transition:.2s}.concept-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--green)}.concept-card-top{display:flex;justify-content:space-between;align-items:center}.concept-card-top span{font-size:10px;font-weight:800;color:var(--green);background:#e5f4ed;padding:5px 8px}.concept-card-top small{font-size:9px;color:#a4aaa8}.concept-card h3{font-size:22px;margin:21px 0 10px;letter-spacing:-.5px}.concept-card>p{font-family:'Gowun Dodum';line-height:1.65;color:#505855;margin:0 0 16px}.concept-card ul{padding-left:18px;margin:2px 0 20px}.concept-card li{font-family:'Gowun Dodum';font-size:13px;line-height:1.7;color:#59615f}.concept-formula{background:var(--ink);color:var(--lime);font-family:monospace;padding:11px 13px;font-size:12px;margin:0 0 14px;overflow:auto}.concept-keywords{display:flex;flex-wrap:wrap;gap:5px;margin-top:auto}.concept-keywords button{border:0;background:var(--cream);color:#59615f;font-family:inherit;font-size:9px;padding:5px 7px;cursor:pointer}.concept-keywords button:hover{background:var(--mint);color:var(--ink)}mark{background:var(--lime);color:inherit;padding:0 1px}.concept-empty{background:white;border:1px solid var(--line);padding:80px 20px;text-align:center}.concept-empty b,.concept-empty span{display:block}.concept-empty span{color:var(--muted);font-family:'Gowun Dodum';margin-top:8px}
@media(max-width:950px){.concept-card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.concept-search-wrap{top:92px;padding:0 13px;height:60px}.concept-search-wrap input{font-size:14px}.note-toolbar{align-items:end}.note-toolbar .note-tabs button{padding:12px 10px}.concept-card-grid{grid-template-columns:1fr}.concept-card{min-height:0}.concept-group-head h2{font-size:24px}}
.result-export{display:flex;align-items:center;gap:10px;background:var(--mint);border:1px solid #91c8b1;padding:20px 24px;margin-top:18px}.result-export>div{margin-right:auto}.result-export span,.result-export b,.result-export small{display:block}.result-export span{font-size:9px;font-weight:800;letter-spacing:1.5px;color:var(--green)}.result-export b{font-size:18px;margin:4px 0}.result-export small{font-family:'Gowun Dodum';color:#53615c}.result-export .btn{white-space:nowrap}.result-export .ghost{background:rgba(255,255,255,.42)}
@media(max-width:700px){.result-export{align-items:stretch;flex-wrap:wrap}.result-export>div{width:100%;margin:0 0 5px}.result-export .btn{flex:1}}