:root{--ink:#17231f;--muted:#69736e;--paper:#f4f1e8;--card:#fffdf8;--line:#d8d4c9;--accent:#315571;--accent2:#6c5792;--soft:#d9e7f0;--mark:#b9dce5;--green:#3f7b68;--shadow:0 18px 50px rgba(23,35,31,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:linear-gradient(90deg,transparent 31px,rgba(23,79,67,.035) 32px),var(--paper);background-size:32px 32px,auto;font-family:"Noto Sans KR",sans-serif;line-height:1.65}.topbar{height:70px;padding:0 clamp(18px,4vw,58px);display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20;background:rgba(244,241,232,.92);border-bottom:1px solid rgba(23,35,31,.12);backdrop-filter:blur(14px)}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none}.brand-mark{width:34px;height:34px;display:grid;place-items:center;color:#fff;background:var(--accent);border-radius:10px;font:800 18px/1 Georgia,serif;transform:rotate(-3deg)}.brand strong{font-size:12px;letter-spacing:.14em}.top-progress{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:11px;font-weight:700}.top-progress>div{width:120px;height:7px;overflow:hidden;background:#dfddd5;border-radius:99px}.top-progress i{display:block;width:0;height:100%;background:var(--accent);transition:.3s}
.layout{width:min(1420px,100%);margin:auto;display:grid;grid-template-columns:230px minmax(0,1120px);gap:34px;padding:34px 28px 90px}.side-nav{position:sticky;top:96px;height:max-content;padding:22px 16px;border:1px solid var(--line);border-radius:20px;background:rgba(255,253,248,.82)}.side-kicker{margin:0 0 12px;color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.16em}.side-nav nav{display:grid;gap:4px}.side-nav a{display:flex;gap:10px;align-items:center;padding:10px;border-radius:11px;color:var(--muted);text-decoration:none;transition:.2s}.side-nav a:hover,.side-nav a.active{color:var(--ink);background:var(--soft)}.side-nav b{font:600 12px/1 "Source Serif 4",serif;color:var(--accent)}.side-nav span{font-size:12px;font-weight:700}.side-nav small{display:block;font-size:9px;font-weight:400}
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.lesson-section{scroll-margin-top:92px;margin:0 0 34px;padding:clamp(26px,5vw,48px);background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}.lesson-section.tinted{background:#eef3f5}.section-head{display:flex;gap:14px;align-items:center;margin-bottom:24px}.section-no{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border-radius:50%;background:var(--mark);font-weight:800}.section-head p{margin:0;color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.16em}.section-head h2{margin:3px 0 0;font:500 clamp(27px,4vw,40px)/1.18 "Source Serif 4",Georgia,serif}.section-intro{margin:-8px 0 28px;color:var(--muted);font-size:13px}.complete-btn,.primary,.secondary,.reading-toolbar button,.record{padding:11px 17px;border-radius:10px;font:700 12px/1.2 inherit;cursor:pointer}.complete-btn,.secondary,.reading-toolbar button{color:var(--accent);background:#fff;border:1px solid var(--accent)}.complete-btn{margin-top:24px}.complete-btn.done{color:#fff;background:var(--green);border-color:var(--green)}.primary,.record{color:#fff;background:var(--accent);border:0;box-shadow:0 4px 0 #203a50}.secondary:disabled{opacity:.4}.feedback{display:none;margin:16px 0 0;padding:12px 15px;border-radius:10px;background:#e3eee9;color:#265e4b;font-size:13px}.feedback.show{display:block}.feedback.bad{color:#873729;background:#f7e7e2}
.vocab-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px}.vocab-card{min-height:160px;padding:22px;text-align:left;border:1px solid var(--line);border-radius:16px;background:#f8f8f3;cursor:pointer;transition:.2s}.vocab-card:hover,.vocab-card.open{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 10px 24px rgba(49,85,113,.12)}.vocab-card .word{font:600 26px/1.2 "Source Serif 4",serif}.vocab-card .pos{margin-left:8px;color:var(--accent);font-size:10px;text-transform:uppercase}.vocab-card p{margin:12px 0 0;color:var(--muted);font-size:12px}.vocab-card .example{display:none;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);color:var(--ink);font:italic 500 14px/1.5 "Source Serif 4",serif}.vocab-card.open .example{display:block}
.quiz-stack{display:grid;gap:13px}.quiz-item{position:relative;overflow:hidden;padding:20px 22px;border:1px solid var(--line);border-radius:15px;background:var(--card)}.quiz-item::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--accent)}.q-prompt{margin:0 0 15px;display:flex;align-items:flex-start;gap:12px}.q-index{width:31px;height:31px;display:grid;place-items:center;flex:0 0 auto;color:#fff;background:var(--accent);border-radius:50%;font:800 11px/1 "Noto Sans KR",sans-serif}.q-copy{padding-top:2px;color:var(--ink);font-size:14px;font-weight:800;line-height:1.55}.quiz-item small{display:block;margin:4px 0 12px;color:var(--muted)}.options{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.options label{padding:10px 12px;border:1px solid #cbc7bc;border-radius:9px;background:#fff;font-size:12px;cursor:pointer}.options label:has(input:checked){color:var(--accent);border-color:var(--accent);background:var(--soft)}.options input{margin-right:7px}.quiz-item.correct{border-color:#4b8c75}.quiz-item.correct::before{background:#4b8c75}.quiz-item.wrong{border-color:#c98070}.quiz-item.wrong::before{background:#c98070}.quiz-item .explain{display:none;margin:11px 0 0;color:var(--muted);font-size:11px}.quiz-item.correct .explain,.quiz-item.wrong .explain{display:block}
.diagram-lab{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(260px,.55fr);gap:18px;align-items:start}.diagram-board-card,.piece-panel{padding:18px;border:1px solid var(--line);border-radius:18px;background:#f8f8f3}.diagram-board-head,.piece-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:14px}.diagram-board-head div{display:grid}.diagram-board-head b{font-size:11px;color:var(--accent)}.diagram-board-head span{font:600 20px "Source Serif 4",serif}.diagram-board-head>strong{color:var(--accent);font:600 18px "Source Serif 4",serif}.original-diagram{position:relative;overflow:hidden;background:#fff;border:1px solid #c9c5ba}.original-diagram>img{display:block;width:100%;height:auto}.diagram-target{position:absolute;padding:0;overflow:hidden;border:2px dashed var(--accent);background:rgba(255,253,248,.94);cursor:pointer;z-index:2}.diagram-target em{position:absolute;left:3px;top:3px;width:18px;height:18px;display:grid;place-items:center;color:#fff;background:var(--accent);border-radius:50%;font:700 9px/1 sans-serif;z-index:2}.diagram-target .crop,.diagram-piece .crop{display:block;width:100%;height:100%;background-repeat:no-repeat}.diagram-target.filled{border-style:solid;background:#fff}.diagram-target.correct{border-color:#4b8c75;box-shadow:0 0 0 3px rgba(75,140,117,.18)}.diagram-target.wrong{border-color:#c45f4d;box-shadow:0 0 0 3px rgba(196,95,77,.15)}.piece-panel{position:sticky;top:92px}.piece-head span{color:var(--accent);font-size:9px;font-weight:800;letter-spacing:.14em}.piece-head h3{margin:2px 0 0;font:600 25px "Source Serif 4",serif}.piece-head button{padding:7px 10px;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:8px;cursor:pointer}.piece-panel>p{color:var(--muted);font-size:11px}.piece-bank{display:grid;gap:9px;margin:16px 0}.diagram-piece{padding:8px;display:grid;grid-template-columns:68px 1fr;align-items:center;gap:10px;text-align:left;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:grab}.diagram-piece .crop{height:48px;border:1px solid #eee}.diagram-piece small{font-weight:700;color:var(--ink)}.diagram-piece.selected{border:2px solid var(--accent);background:var(--soft)}.diagram-piece.used{opacity:.35;cursor:default}.piece-panel .primary{width:100%}
.reading-toolbar{display:flex;gap:8px;align-items:end;flex-wrap:wrap;margin-bottom:20px;padding:14px;border-radius:13px;background:#eef3f5}.reading-toolbar label{display:grid;gap:4px;color:var(--accent);font-size:8px;font-weight:800;letter-spacing:.12em}.reading-toolbar select{min-width:240px;padding:9px 11px;color:var(--ink);background:#fff;border:1px solid #b8c3ca;border-radius:9px;font:600 11px "Noto Sans KR",sans-serif}.reading-toolbar audio{display:none}.reading-toolbar>span{flex-basis:100%;color:var(--muted);font-size:10px}.passage{font:500 clamp(18px,2.2vw,22px)/1.9 "Source Serif 4",Georgia,serif}.passage p{margin:0 0 18px}.passage mark{color:inherit;background:linear-gradient(transparent 55%,rgba(185,220,229,.9) 55%)}.passage .evidence{transition:.2s}.passage.show-evidence .evidence{background:#fff0b9;border-radius:6px;box-shadow:0 0 0 4px #fff0b9}.reading-note{margin-top:25px;padding:18px;border-left:4px solid var(--accent);border-radius:10px;background:var(--soft)}.reading-note b{display:block;color:var(--accent);font-size:10px;letter-spacing:.14em}.reading-note span{font-size:12px;color:var(--muted)}
.exam{gap:22px}.exam .quiz-item{padding:26px 28px 28px 32px}.exam .q-prompt{margin-bottom:18px}.exam .q-index{width:36px;height:36px;background:var(--accent);font-size:12px}.exam .q-copy{font:700 21px/1.45 "Source Serif 4",Georgia,serif}.exam .options{grid-template-columns:1fr;gap:10px;margin-top:16px}.exam .options label{padding:14px 16px;font:500 15px/1.6 "Source Serif 4",serif}.grammar-lens{margin-bottom:18px;padding:18px;display:grid;grid-template-columns:auto 1fr auto 1fr;align-items:center;gap:10px;background:#e9e4f1;border-radius:14px}.grammar-lens span{color:var(--accent2);font-size:9px;font-weight:800}.grammar-lens strong{font:500 15px "Source Serif 4",serif}.grammar-lens i{color:var(--accent2);font-size:10px}
.writing-mission{padding:24px;color:#fff;background:var(--accent);border-radius:17px}.writing-mission>span{color:var(--mark);font-size:9px;font-weight:800;letter-spacing:.15em}.writing-mission h3{max-width:820px;margin:7px 0 10px;font:700 21px/1.5 "Noto Sans KR",sans-serif}.writing-mission p{margin:0;color:rgba(255,255,255,.82);font-size:12px;line-height:1.75}.writing-mission>div{display:flex;flex-wrap:wrap;gap:7px;margin-top:16px}.writing-mission i{padding:5px 9px;border:1px solid rgba(255,255,255,.25);border-radius:99px;font-size:9px;font-style:normal}.translation-set{display:grid;gap:14px;margin:20px 0}.translation-item{padding:21px 22px;border:1px solid var(--line);border-radius:15px;background:#f8f8f3;transition:.2s}.translation-item.correct{border-color:#4b8c75;box-shadow:inset 5px 0 #4b8c75}.translation-item.wrong{border-color:#c98070;box-shadow:inset 5px 0 #c98070}.translation-head{display:flex;align-items:center;gap:12px}.translation-head>span{width:34px;height:34px;display:grid;place-items:center;color:#fff;background:var(--accent);border-radius:50%;font:800 11px sans-serif}.translation-head>div{display:grid;gap:2px}.translation-head b{font-size:13px;color:var(--ink)}.translation-head small{color:var(--accent);font-size:10px;font-weight:700}.korean-sentence{margin:16px 0 12px;font-size:16px;font-weight:700;line-height:1.7}.writing-hint{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:9px;background:#e9e4f1}.writing-hint b{color:var(--accent2);font-size:9px;letter-spacing:.12em}.writing-hint code{color:var(--ink);font:500 12px/1.5 "Source Serif 4",serif}.translation-item label{display:block;margin-top:12px;color:var(--accent);font-size:10px;font-weight:800}.translation-item textarea,.transcript-box textarea{width:100%;margin-top:6px;padding:12px;color:var(--ink);background:#fff;border:1px solid #c9c5ba;border-radius:10px;font:500 15px/1.6 "Source Serif 4",serif;outline:none;resize:vertical}.translation-item textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(49,85,113,.12)}.item-feedback{display:none;margin:9px 0 0;font-size:10px;font-weight:700}.translation-item.correct .item-feedback{display:block;color:#24634e}.translation-item.wrong .item-feedback{display:block;color:#944638}.button-row{display:flex;gap:9px}.writing-actions{margin-top:18px}.model-answer{margin-top:18px;padding:18px;border-radius:12px;background:#e9e4f1}.model-answer b{color:var(--accent2);font-size:10px;letter-spacing:.15em}.model-answer ol{margin:12px 0 0;padding-left:22px}.model-answer li{margin:7px 0;font:500 15px/1.65 "Source Serif 4",serif}
.speaking-target{padding:22px;border-radius:16px;color:#fff;background:var(--accent)}.speaking-target span{color:#b9dce5;font-size:9px;font-weight:800;letter-spacing:.14em}.speaking-target p{margin:9px 0 0;font:500 19px/1.65 "Source Serif 4",serif}.speech-support{margin:14px 0 -4px;padding:10px 13px;border:1px solid #b8d6c9;border-radius:10px;color:#265e4b;background:#e7f2ed;font-size:11px;font-weight:700}.speech-support.limited{color:#824033;background:#f8ebe7;border-color:#e2b9ae}.speech-support b{margin-right:8px}.record-controls{margin:20px 0;display:flex;align-items:center;gap:10px}.record{background:#a84a42;box-shadow:0 4px 0 #71322d}.record.recording{animation:pulse 1.3s infinite}.record-controls span{font:600 16px/1 monospace}.speaking-section audio{width:100%;margin-bottom:18px}.transcript-box{display:block}.speech-result{margin-top:16px;padding:18px;display:flex;justify-content:space-between;gap:18px;border-radius:13px;background:#eef3f5}.speech-result strong{font:600 20px "Source Serif 4",serif}.speech-result span{max-width:500px;color:var(--muted);font-size:11px}.privacy-note{color:var(--muted);font-size:10px}.page-footer{padding:30px 5px;display:flex;justify-content:space-between;border-top:1px solid var(--line);color:var(--muted);font-size:10px;letter-spacing:.08em}@keyframes pulse{50%{transform:scale(1.03);box-shadow:0 0 0 8px rgba(168,74,66,.15)}}
@media(max-width:980px){.layout{display:block;padding:22px 16px 70px}.side-nav{position:sticky;top:70px;z-index:15;margin-bottom:18px;padding:8px;overflow-x:auto;border-radius:14px}.side-kicker,.side-nav small{display:none}.side-nav nav{display:flex;width:max-content}.side-nav a{min-width:105px}.hero{height:470px}.hero-copy{left:28px;bottom:35px}.vocab-grid{grid-template-columns:1fr}.diagram-lab{grid-template-columns:1fr}.piece-panel{position:static}.mission-strip{display:block}.mission-strip p{margin-top:10px}.grammar-lens{grid-template-columns:1fr 1fr}.options{grid-template-columns:1fr}}
@media(max-width:600px){.top-progress>div{display:none}.brand strong{font-size:10px}.hero{height:520px}.hero img{object-position:63% center}.hero-shade{background:linear-gradient(0deg,rgba(19,31,50,.95) 0%,rgba(28,44,69,.15) 78%)}.hero-copy{right:24px}.hero h1{font-size:46px}.lesson-section{padding:25px 18px}.section-head h2{font-size:28px}.speech-result,.writing-meter,.page-footer{flex-direction:column}.record-controls{flex-wrap:wrap}}
@media print{.topbar,.side-nav,.complete-btn,.primary,.secondary,.reading-toolbar,.record-controls,audio{display:none!important}.layout{display:block;padding:0}.hero{height:360px}.lesson-section{break-inside:avoid;box-shadow:none}}