:root{--ink:#172426;--muted:#5d6b6d;--line:#d8e0df;--paper:#f5f7f5;--panel:#fff;--teal:#0c6b68;--gold:#a66a00;--red:#a13d32;--ok:#28734f}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Noto Sans KR",system-ui,sans-serif;line-height:1.65}
main{width:min(1180px,calc(100% - 28px));margin:auto;padding:24px 0 80px}.hero,.panel,.unit{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:0 4px 18px rgba(20,40,40,.06)}
.hero{padding:28px;border-top:7px solid var(--teal)}h1,h2,h3{line-height:1.25}h1{font-size:clamp(2rem,5vw,3.5rem);margin:.2em 0}h2{margin-top:0}.eyebrow{color:var(--teal);font-size:.78rem;font-weight:900;letter-spacing:.1em;text-transform:uppercase}
.lead{font-size:1.08rem;color:var(--muted);max-width:850px}.source-note{background:#fff7df;border-left:5px solid var(--gold);padding:12px 14px}.quick-nav{display:flex;gap:8px;flex-wrap:wrap;position:sticky;top:0;z-index:4;background:rgba(245,247,245,.95);padding:10px 0}
a{color:var(--teal)}.quick-nav a,.button{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 12px;text-decoration:none;font-weight:800}.panel{margin-top:18px;padding:22px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}.stats div{background:#eef7f5;border-radius:12px;padding:12px}.stats strong{display:block;font-size:1.6rem;color:var(--teal)}
.task-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:13px}.task-card{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff}.task-card h3{margin:.35em 0}.task-card small{color:var(--muted)}
.progress{height:12px;background:#e2e9e8;border-radius:99px;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--teal),#56a991);width:0}
.unit-list{display:grid;gap:14px}.unit{overflow:hidden}.unit>summary{cursor:pointer;display:flex;gap:12px;align-items:flex-start;padding:17px;font-weight:800}.unit>summary::marker{color:var(--teal)}.unit-id{background:#e4f2ef;color:var(--teal);border-radius:8px;padding:3px 8px;white-space:nowrap}.unit-body{border-top:1px solid var(--line);padding:18px}
.question{font-size:1.06rem;font-weight:800}.concept{background:#f0f7fa;border-left:5px solid #39869a;padding:12px}.steps{counter-reset:step;list-style:none;padding:0}.steps li{counter-increment:step;margin:9px 0;padding-left:38px;position:relative}.steps li:before{content:counter(step);position:absolute;left:0;top:0;background:var(--teal);color:#fff;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-weight:900}
.answer{background:#eef8ef;border-left:5px solid var(--ok);padding:12px}.pitfall{background:#fff0ee;border-left:5px solid var(--red);padding:12px}.recall{background:#fff8e7;border:1px dashed var(--gold);padding:12px}.actions{display:flex;gap:8px;flex-wrap:wrap}.actions button{border:1px solid var(--line);border-radius:9px;background:#fff;padding:8px 11px;font-weight:800;cursor:pointer}.actions .done.is-done{background:var(--ok);color:#fff}
[data-reset]{border:1px solid #b9cdca;border-radius:9px;background:#eef7f5;color:var(--teal);padding:8px 12px;font-weight:800;cursor:pointer}
.hidden-answer[hidden]{display:none}.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:10px}.gallery figure{margin:0}.gallery img{width:100%;border:1px solid var(--line);border-radius:10px}.gallery figcaption{font-size:.82rem;color:var(--muted)}
.citation{font-size:.88rem;color:var(--muted)}code,pre{font-family:"Cascadia Mono",Consolas,monospace}pre{white-space:pre-wrap}.footer-nav{display:flex;justify-content:space-between;gap:10px;margin-top:20px}
.lesson-cta{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;background:linear-gradient(135deg,#e7f5f2,#fff8e7);border:2px solid #a9d3ca}.lesson-cta p{margin-bottom:0}.lesson-cta .button{background:var(--teal);color:#fff;border-color:var(--teal);white-space:nowrap}
.beginner-grid,.foundation-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}.beginner-card,.foundation-card{border:1px solid var(--line);border-radius:13px;padding:15px;background:#fbfdfc}.beginner-card h3,.foundation-card h3{margin-top:0}.analogy{background:#fff8e7;border-left:5px solid var(--gold);padding:15px}.worked{background:#eef8ef;border-left:5px solid var(--ok);padding:15px}.support{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}.support>div{border-radius:12px;padding:13px}.support .warmup{background:#f0f7fa}.support .verify{background:#f6f1fb}.micro-why{font-size:.95rem;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:12px}
.flow,.datapath-mini,.timing-path,.lifetime{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:16px;background:#f0f7fa;border-radius:14px}.flow span,.datapath-mini span,.timing-path span,.lifetime span,.lifetime b,.lifetime i{background:#fff;border:1px solid var(--line);border-radius:9px;padding:8px 10px}.flow b,.timing-path b{color:var(--teal);font-size:.78rem}.memory-ladder{display:grid;gap:6px;max-width:620px;margin:14px auto}.memory-ladder>*{text-align:center;padding:7px;border-radius:8px}.memory-ladder strong:nth-of-type(1){background:#0c6b68;color:#fff}.memory-ladder strong:nth-of-type(2){background:#4e9186;color:#fff}.memory-ladder strong:nth-of-type(3){background:#a8c9bf}.memory-ladder strong:nth-of-type(4){background:#dbe8e3}.memory-ladder span{font-size:.8rem;color:var(--muted)}
.bit-strip,.address-split{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr 1.2fr;border:1px solid var(--line);border-radius:12px;overflow:hidden}.bit-strip span,.address-split span{padding:14px 8px;text-align:center;border-right:1px solid #fff;font-weight:800}.bit-strip .imm,.address-split .tag{background:#d9eaf5}.bit-strip .rs{background:#e8def3}.bit-strip .fn{background:#f9e6b7}.bit-strip .rd{background:#d9efdf}.bit-strip .op{background:#f3d5d1}.address-split{grid-template-columns:11fr 2fr 3fr}.address-split .set{background:#f9e6b7}.address-split .offset{background:#d9efdf}
.array-visual{display:flex;align-items:stretch;gap:4px;flex-wrap:wrap}.array-visual>*{padding:13px;border:1px solid var(--line);background:#fff}.array-visual span{background:#e4f2ef}.array-visual small{display:block;color:var(--muted)}.trace-box,.formula{background:#172426;color:#eef7f5;border-radius:12px;padding:15px;overflow:auto}.visual-note{color:var(--muted);text-align:center}.set-visual{display:flex;flex-wrap:wrap;justify-content:center;gap:0;margin:10px}.set-visual span{border:2px solid #7fb5ab;border-radius:50%;padding:22px;margin:-3px;background:rgba(220,241,237,.55)}.set-visual strong{align-self:center;color:var(--teal)}
.pipeline-grid{display:grid;grid-template-columns:1.5fr repeat(5,1fr);gap:3px}.pipeline-grid>*{padding:8px;text-align:center;border-radius:6px}.pipeline-grid b{background:#172426;color:#fff}.pipeline-grid span{background:#e4f2ef;font-weight:800}.pipeline-grid i{background:#d9eaf5;font-style:normal}.pipeline-grid em{background:#edf0ef}.lifetime i{background:#f3d5d1}.lesson-list li{margin:.6em 0}.breadcrumbs{font-size:.92rem}.concept-link{font-weight:900}.guide-nav{display:flex;gap:8px;flex-wrap:wrap}
.prose{max-width:900px;margin-left:auto;margin-right:auto}.prose p{font-size:1.04rem;line-height:1.85}.prose h2{margin-top:2.2em;padding-top:.7em;border-top:1px solid var(--line)}.prose h3{margin-top:1.8em}.prose-lead{font-size:1.16rem!important;color:#344649}.reading-section{margin:0;padding:0}.reading-section+.reading-section{margin-top:28px}.term-list{margin:0}.term-list dt{font-weight:900;color:var(--teal);margin-top:18px}.term-list dd{margin:5px 0 0;font-size:1.02rem;line-height:1.8}.qa-block{border-left:4px solid #8abcb3;padding-left:18px;margin:24px 0}.qa-block h3{margin:0 0 5px}.formula-stack{display:grid;gap:16px;margin:22px 0}.formula-card{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fbfdfc;overflow-x:auto}.formula-card h3{margin:0}.formula-card math{font-size:1.35rem;margin:18px auto}.formula-card p{font-size:.94rem;color:var(--muted);margin-bottom:0}.concept-diagram{width:100%;height:310px;border:1px solid var(--line);border-radius:14px;background:#f8fafc}.unit-map{list-style:none;padding:0;margin:0}.unit-map li{display:grid;grid-template-columns:auto 1fr auto;gap:13px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}.unit-map .unit-id{align-self:start}.unit-map p{margin:4px 0;color:var(--muted)}.unit-map .button{white-space:nowrap}.unit-lesson-nav{display:flex;gap:8px;flex-wrap:wrap}.exam-box{border:2px solid #9fc8c0;border-radius:14px;padding:20px;background:#f5fbf9}.worked-chain{counter-reset:worked;list-style:none;padding:0}.worked-chain li{counter-increment:worked;position:relative;padding:0 0 24px 46px;min-height:42px}.worked-chain li:before{content:counter(worked);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:8px;background:var(--teal);color:#fff;display:grid;place-items:center;font-weight:900}.worked-chain li:not(:last-child):after{content:"";position:absolute;left:14px;top:32px;height:calc(100% - 34px);border-left:2px solid #9fc8c0}.narrative-callout{margin:24px 0;padding:18px;border-left:5px solid var(--gold);background:#fff9e8}.source-image{max-width:100%;border:1px solid var(--line);border-radius:12px}.chapter-link{display:inline-flex;align-items:center;gap:6px}.unit-page-link{font-weight:900}.reading-route{font-size:.96rem;color:var(--muted)}
.embedded-diagram{margin:24px 0;overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:#f8fafc;padding:12px}.embedded-diagram svg{width:100%;height:auto;display:block}.embedded-diagram .diagram-title{font-size:22px;font-weight:800;fill:#172033}.embedded-diagram .diagram-label{font-size:15px;font-weight:750;fill:#172033}.embedded-diagram .diagram-small{font-size:12px;fill:#5b6475}.embedded-diagram .diagram-node{stroke:#64748b;stroke-width:1}.embedded-diagram .diagram-input{fill:#bfdbfe}.embedded-diagram .diagram-process{fill:#c7d2fe}.embedded-diagram .diagram-storage{fill:#99f6e4}.embedded-diagram .diagram-edge{stroke:#64748b;stroke-width:2;fill:none}
.worksheet-wrap{overflow-x:auto;margin:22px 0}.worksheet{width:100%;border-collapse:collapse;font-size:.95rem}.worksheet caption{text-align:left;font-size:1.15rem;font-weight:900;margin-bottom:10px}.worksheet th{background:#e6f2ef;color:#164f4c;text-align:left}.worksheet th,.worksheet td{border:1px solid #cbd9d6;padding:10px;vertical-align:top}.micro-unit-list{display:grid;gap:14px;margin:24px 0}.micro-unit{border-left:5px solid var(--teal);padding:4px 0 4px 18px}.micro-unit h3{margin:0 0 8px}.micro-unit .micro-action{font-size:1.06rem;font-weight:800}.micro-unit dl{display:grid;grid-template-columns:90px 1fr;gap:5px 12px;margin:8px 0}.micro-unit dt{font-weight:900;color:var(--teal)}.micro-unit dd{margin:0}.code-extract{background:#152324;color:#f0f8f6;border-radius:12px;padding:16px;overflow-x:auto;font-size:.92rem;line-height:1.65}.practice-set{border-top:3px solid var(--gold);background:#fffaf0;padding:18px;margin-top:22px}.practice-set li{margin:12px 0}.state-snapshot{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:18px 0}.state-snapshot div{border:1px solid var(--line);border-radius:10px;padding:10px;background:#f8fbfa}.state-snapshot strong{display:block;color:var(--teal);font-size:.8rem}.source-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}.source-pair figure{margin:0}.content-audit-note{font-size:.94rem;color:var(--muted);border-left:4px solid #9fc8c0;padding-left:12px}
.exam-use{display:block;margin-top:5px;color:var(--muted);font-size:.94rem}.paper-action{background:#f0f7fa;border-radius:9px;padding:9px 11px}.worked-example{margin-top:28px;padding-top:8px}.worked-example .model-answer,.official-answer,.model-answer{border:1px solid #b9cdca;border-radius:12px;padding:12px 15px;background:#f8fbfa}.model-answer>summary,.official-answer>summary{cursor:pointer;font-weight:900;color:var(--teal)}.attempt-gate,.recall-before-answer,.completion-checks{border:2px solid #d9bf7b;border-radius:14px;padding:17px;background:#fffaf0;margin:20px 0}.attempt-gate label,.artifact-label,.practice-card label,.recall-before-answer label{display:grid;gap:6px;font-weight:800}.attempt-gate textarea,.artifact-label textarea,.practice-card textarea,.recall-before-answer textarea{width:100%;border:1px solid #9fb6b2;border-radius:9px;padding:10px;font:inherit;background:#fff;resize:vertical}.practice-actions{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:10px}.practice-actions button{border:1px solid #7ca9a0;border-radius:9px;background:#fff;color:var(--teal);padding:8px 11px;font-weight:900;cursor:pointer}.practice-grid{display:grid;gap:15px}.practice-card{border:1px solid #ddc98f;border-radius:13px;padding:16px;background:#fff}.practice-feedback{min-height:1.6em;font-weight:800}.practice-feedback.is-correct{color:var(--ok)}.practice-feedback.is-partial{color:var(--red)}.practice-hint{background:#f0f7fa;padding:10px;border-radius:9px}.micro-heading,.completion-item{display:flex;gap:9px;align-items:flex-start;cursor:pointer}.micro-heading input,.completion-item input{margin-top:.35em;accent-color:var(--teal)}.micro-unit.is-done{border-left-color:var(--ok);background:#f4fbf7}.completion-checks>div{display:grid;gap:9px}.completion-item{border:1px solid var(--line);border-radius:10px;padding:10px;background:#fff}.completion-item:has(input:checked){border-color:var(--ok);background:#eef8ef}
@media(max-width:600px){main{width:min(100% - 16px,1180px);padding-top:8px}.hero,.panel{padding:16px;border-radius:13px}.unit>summary{padding:13px}.unit-body{padding:14px}.quick-nav{position:static}.gallery{grid-template-columns:1fr}.lesson-cta{grid-template-columns:1fr}.support{grid-template-columns:1fr}.bit-strip{font-size:.72rem}.pipeline-grid{font-size:.72rem;overflow:auto}.flow,.timing-path{align-items:stretch;flex-direction:column}.flow b,.timing-path b{text-align:center}.unit-map li{grid-template-columns:auto 1fr}.unit-map .button{grid-column:1/-1;text-align:center}.concept-diagram{height:360px}.formula-card math{font-size:1.05rem}.prose p{font-size:1rem;line-height:1.75}.embedded-diagram svg{min-width:880px}.micro-unit dl{grid-template-columns:1fr}.source-pair{grid-template-columns:1fr}.state-snapshot{grid-template-columns:1fr 1fr}.state-snapshot div:last-child{grid-column:1/-1}}