/* 파운데이션 모델 — 강 위젯 스타일. 원본 bruni-world /from-scratch/ 인라인 <style> 에서 본문·위젯 규칙만 옮겼다. */
.lesson-from-scratch{
  --ink:var(--bg); --ink2:var(--surface); --ink3:var(--surface-2); --line2:var(--line-2);
  --muted:var(--text-2); --muted-d:var(--text-3); --accent:var(--mint); --accent-soft:var(--mint-soft);
  --warn:#ffc44d; --warn-dim:rgba(255,196,77,.14); --blue:#6aa9ff; --blue-dim:rgba(106,169,255,.14);
  --bad-dim:rgba(255,107,107,.14);
}
:root[data-theme="light"] .lesson-from-scratch{
  --warn:#8a5a00; --warn-dim:rgba(154,98,0,.12); --blue:#1d5bb0; --blue-dim:rgba(29,91,176,.10); --bad-dim:rgba(179,38,30,.10);
}
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]) .lesson-from-scratch{
    --warn:#8a5a00; --warn-dim:rgba(154,98,0,.12); --blue:#1d5bb0; --blue-dim:rgba(29,91,176,.10); --bad-dim:rgba(179,38,30,.10);
  }
}

.lesson-from-scratch p,.lesson-from-scratch li{overflow-wrap:anywhere}
.lesson-from-scratch p.mut{color:var(--muted)}

.lesson-from-scratch .key{margin-top:20px;padding:16px 20px;background:var(--mint-dim);
  border-left:3px solid var(--accent);border-radius:0 12px 12px 0;font-weight:600;color:var(--text);overflow-wrap:anywhere}
.lesson-from-scratch .src{margin-top:18px;font-size:12.5px;color:var(--muted-d);line-height:1.7}
.lesson-from-scratch .src a{color:var(--muted)}
.lesson-from-scratch .est{display:inline-block;font-size:10.5px;font-weight:800;letter-spacing:.08em;padding:1px 7px;border-radius:999px;
  background:var(--warn-dim);color:var(--warn);vertical-align:2px;margin-left:3px;line-height:1.6}
.lesson-from-scratch .est.c{background:var(--blue-dim);color:var(--blue)}
.lesson-from-scratch .est.x{background:var(--bad-dim);color:var(--bad)}

.lesson-from-scratch .demo{margin-top:22px;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--ink2)}
.lesson-from-scratch .demo-bar{display:flex;align-items:center;gap:10px;justify-content:space-between;
  padding:11px 16px;border-bottom:1px solid var(--line2);font-size:12.5px;color:var(--muted)}
.lesson-from-scratch .demo-bar b{color:var(--accent);font-weight:700;letter-spacing:.06em;flex-shrink:0}
.lesson-from-scratch .demo-stage{padding:22px}
@media (max-width:560px){.lesson-from-scratch .demo-stage{padding:16px}}

.lesson-from-scratch .tbl-wrap{overflow-x:auto;margin-top:4px}
.lesson-from-scratch .tbl-wrap table{width:100%;min-width:520px;border-collapse:collapse;margin-top:16px;font-size:13.5px}
.lesson-from-scratch .tbl-wrap th,.lesson-from-scratch .tbl-wrap td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line2);vertical-align:top}
.lesson-from-scratch .tbl-wrap th{color:var(--muted);font-weight:600;font-size:12.5px;white-space:nowrap}
.lesson-from-scratch td b{color:var(--accent)}
.lesson-from-scratch .num{font-variant-numeric:tabular-nums}

.lesson-from-scratch pre{margin-top:16px;background:var(--code-bg);border:1px solid var(--code-line);border-radius:12px;padding:14px 16px;
  font-size:12.5px;line-height:1.55;overflow-x:auto;color:var(--code-text);font-family:var(--mono);white-space:pre}
.lesson-from-scratch pre code{background:none;padding:0;font-size:inherit;color:inherit}

/* 프리셋·선택 알약 */
.lesson-from-scratch .vf-row{margin-bottom:16px}
.lesson-from-scratch .vf-row.L-last{margin-bottom:0}
.lesson-from-scratch .vf-row .lab{font-size:12px;color:var(--muted);margin-bottom:8px}
.lesson-from-scratch .vpills{display:flex;gap:8px;flex-wrap:wrap}
.lesson-from-scratch .vpill{font-family:inherit;font-size:13px;font-weight:600;color:var(--muted);
  background:var(--ink3);border:1px solid var(--line2);border-radius:999px;padding:8px 14px;cursor:pointer;transition:.15s}
.lesson-from-scratch .vpill:hover{color:var(--text);border-color:var(--text-3)}
.lesson-from-scratch .vpill.on{background:var(--accent);color:var(--mint-ink);border-color:transparent;font-weight:700}
.lesson-from-scratch .verdict{margin-top:18px;padding:16px 18px;border-radius:14px;background:var(--ink3);border:1px solid var(--line2);transition:.15s}
.lesson-from-scratch .verdict .vt{font-size:11px;letter-spacing:.14em;color:var(--muted-d);font-weight:700}
.lesson-from-scratch .verdict .vb{font-size:19px;font-weight:800;margin-top:6px;color:var(--text)}
.lesson-from-scratch .verdict .vd{font-size:13.5px;color:var(--muted);margin-top:6px;line-height:1.6;overflow-wrap:anywhere}
.lesson-from-scratch .verdict.g{border-color:var(--accent);background:var(--mint-dim)}
.lesson-from-scratch .verdict.g .vb{color:var(--accent)}
.lesson-from-scratch .verdict.w{border-color:var(--warn);background:var(--warn-dim)}
.lesson-from-scratch .verdict.w .vb{color:var(--warn)}
.lesson-from-scratch .verdict.b{border-color:var(--bad);background:var(--bad-dim)}
.lesson-from-scratch .verdict.b .vb{color:var(--bad)}

/* 계산기 */
.lesson-from-scratch .calc{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px 14px}
.lesson-from-scratch .calc label{display:flex;flex-direction:column;gap:4px;font-size:11.5px;color:var(--muted-d);min-width:0}
.lesson-from-scratch .calc input,.lesson-from-scratch .calc select{font-family:inherit;font-size:14px;color:var(--text);background:var(--ink3);
  border:1px solid var(--line2);border-radius:9px;padding:8px 10px;width:100%;min-width:0}
.lesson-from-scratch .calc input:focus,.lesson-from-scratch .calc select:focus{outline:none;border-color:var(--accent)}
.lesson-from-scratch .calc .chk{flex-direction:row;align-items:center;gap:8px;font-size:13px;color:var(--muted);align-self:end;padding-bottom:8px}
.lesson-from-scratch .calc .chk input{width:16px;height:16px;accent-color:var(--accent)}
.lesson-from-scratch .out{margin-top:18px;border-top:1px solid var(--line2);padding-top:6px}
.lesson-from-scratch .out .L-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  padding:8px 0;border-bottom:1px solid var(--line2);font-size:13.5px}
.lesson-from-scratch .out .L-row:last-child{border-bottom:0}
.lesson-from-scratch .out .L-row .k{color:var(--muted)}
.lesson-from-scratch .out .L-row .v{font-weight:700;color:var(--text);font-variant-numeric:tabular-nums;text-align:right;overflow-wrap:anywhere}
.lesson-from-scratch .out .L-row .v.hi{color:var(--accent);font-size:18px}
.lesson-from-scratch .bar{height:8px;border-radius:99px;background:var(--ink3);overflow:hidden;display:flex;margin-top:12px}
.lesson-from-scratch .bar i{display:block;height:100%}
.lesson-from-scratch .bar-leg{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--muted-d);margin-top:8px}
.lesson-from-scratch .bar-leg i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.lesson-from-scratch .b-m{background:var(--accent)}
.lesson-from-scratch .b-a{background:var(--blue)}
.lesson-from-scratch .b-e{background:var(--warn)}
.lesson-from-scratch .note{font-size:12.5px;color:var(--muted-d);margin-top:12px;line-height:1.6;overflow-wrap:anywhere}

/* 15강 그림 */
.lesson-from-scratch .pipe{margin-top:18px;display:flex;flex-direction:column;gap:8px}
.lesson-from-scratch .pipe .st{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:12px;
  background:var(--ink3);border:1px solid var(--line2);border-radius:12px;padding:12px 14px;font-size:13px;overflow-wrap:anywhere}
.lesson-from-scratch .pipe .st .in{color:var(--muted-d);font-size:12px;line-height:1.55}
.lesson-from-scratch .pipe .st .in b{display:block;color:var(--muted);font-weight:600;font-size:11px;letter-spacing:.14em;margin-bottom:4px}
.lesson-from-scratch .pipe .st .L-mk{line-height:1.55}
.lesson-from-scratch .pipe .st .L-mk b{color:var(--text);display:block}
.lesson-from-scratch .pipe .st .L-mk span{color:var(--muted);font-size:12.5px}
.lesson-from-scratch .pipe .st.star{border-color:var(--accent);background:var(--mint-dim)}
.lesson-from-scratch .pipe .st.star .L-mk b{color:var(--accent)}
.lesson-from-scratch .pipe .arrow{text-align:center;color:var(--muted-d);font-size:12px;line-height:1}
@media (max-width:560px){.lesson-from-scratch .pipe .st{grid-template-columns:1fr}}

.lesson-from-scratch .outro{margin-top:48px;padding:24px 26px;border:1px solid var(--line);border-radius:18px;background:var(--ink2)}
.lesson-from-scratch .outro p{margin-top:0}
.lesson-from-scratch .outro p+p{margin-top:12px}
.lesson-from-scratch .outro b{color:var(--accent)}

/* 표지 부록 — 검증 체크리스트 */
.lesson-from-scratch .ck{margin-top:6px;display:flex;flex-direction:column;gap:2px}
.lesson-from-scratch .ck .g{font-size:11.5px;letter-spacing:.2em;color:var(--accent);font-weight:700;margin:18px 0 6px}
.lesson-from-scratch .ck label{display:flex;gap:11px;align-items:flex-start;padding:8px 10px;border-radius:10px;
  font-size:14.5px;color:var(--text-prose);cursor:pointer}
.lesson-from-scratch .ck label:hover{background:var(--mint-dim)}
.lesson-from-scratch .ck input{width:17px;height:17px;accent-color:var(--accent);margin-top:3px;flex-shrink:0}
.lesson-from-scratch .ck input:checked+span{color:var(--muted-d)}
.lesson-from-scratch .ck-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:20px}
.lesson-from-scratch .ck-count{font-size:13px;color:var(--muted)}
.lesson-from-scratch .ck-count b{color:var(--accent);font-size:17px}
.lesson-from-scratch .ck-reset{font-family:inherit;font-size:12px;background:none;border:1px solid var(--line2);
  color:var(--muted-d);border-radius:999px;padding:5px 12px;cursor:pointer}
.lesson-from-scratch .ck-reset:hover{color:var(--bad);border-color:var(--bad)}

@media (prefers-reduced-motion:reduce){.lesson-from-scratch *{transition-duration:.01ms!important}}