/* ══════════════════════════════════════════════════════════
   데이터베이스 첫걸음 — 노트북 스타일
   ══════════════════════════════════════════════════════════ */
:root{
  --blue:#3b82f6; --blue-s:#dbeafe; --mint:#10b981; --mint-s:#d1fae5;
  --coral:#f97316; --coral-s:#ffedd5; --violet:#8b5cf6; --violet-s:#ede9fe;
  --rose:#ef4444;  --rose-s:#fee2e2; --amber:#f59e0b; --amber-s:#fef3c7;
  --paper:#fff; --page:#f4f6fa; --ink:#1e293b; --ink-2:#475569; --ink-3:#94a3b8;
  --line:#e2e8f0; --line-2:#cbd5e1;
  --code-bg:#0f172a; --code-ink:#e2e8f0;
  --shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px -8px rgba(15,23,42,.10);
  --radius:16px;
}
[data-bs-theme="dark"]{
  --blue-s:#1e3a5f; --mint-s:#064e3b; --coral-s:#4a2610; --violet-s:#2e1065;
  --rose-s:#4c1d1d; --amber-s:#453005;
  --paper:#151b26; --page:#0b0f16; --ink:#e5e9f0; --ink-2:#a8b3c4; --ink-3:#6b7688;
  --line:#28303d; --line-2:#3a4453; --code-bg:#0a0e15;
  --shadow:0 1px 3px rgba(0,0,0,.4),0 8px 24px -8px rgba(0,0,0,.5);
}
*{ -webkit-tap-highlight-color:transparent }
html{ font-size:18px } /* --drson-root-font */
body{
  font-family:'Pretendard Variable',Pretendard,-apple-system,BlinkMacSystemFont,
              'Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;
  background:var(--page); color:var(--ink);
  font-size:1rem; line-height:1.78; letter-spacing:-.011em;
  word-break:keep-all; overflow-wrap:anywhere;
}
code,pre,.code-area,.mono{
  font-family:'JetBrains Mono','SF Mono',Menlo,Consolas,'D2Coding',monospace;
}

/* ── 상단바 ───────────────────────────────── */
.nb-top{
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:blur(12px); border-bottom:1px solid var(--line); min-height:56px;
}
.nb-brand{ font-weight:800; font-size:1.05rem; color:var(--ink)!important; letter-spacing:-.02em }
.nb-brand span{ background:linear-gradient(90deg,var(--blue),var(--violet));
  -webkit-background-clip:text; background-clip:text; color:transparent }
.nb-progress{ align-items:center; gap:.5rem }
.nb-progress-bar{ width:110px; height:7px; background:var(--line); border-radius:99px; overflow:hidden }
.nb-progress-bar span{ display:block; height:100%; width:0;
  background:linear-gradient(90deg,var(--blue),var(--mint)); border-radius:99px; transition:width .45s ease }
#progText{ color:var(--ink-3); font-variant-numeric:tabular-nums; font-size:.78rem; white-space:nowrap }

/* ── 레이아웃 ─────────────────────────────── */
.nb-shell{ display:flex; align-items:flex-start; max-width:1500px; margin:0 auto; gap:0 }
.nb-main{ flex:1; min-width:0; padding:1.6rem clamp(.65rem,2.4vw,2rem) 4rem }

/* ── 목차 ────────────────────────────────── */
.nb-toc{ width:308px; flex:0 0 308px; background:var(--paper); border-right:1px solid var(--line) }
@media (min-width:992px){
  .nb-toc{ position:sticky; top:56px; height:calc(100vh - 56px); overflow-y:auto }
  .nb-toc::-webkit-scrollbar{ width:7px }
  .nb-toc::-webkit-scrollbar-thumb{ background:var(--line-2); border-radius:9px }
}
/* Bootstrap 은 ≥lg 에서 .offcanvas-body 를 display:flex(가로) + padding:0 으로 바꾼다.
   세로 목차이므로 되돌린다. */
.nb-toc .offcanvas-body{ display:block!important; padding:1rem .7rem!important; overflow-y:visible }
.toc-title{ font-size:.72rem; font-weight:800; color:var(--ink-3);
  letter-spacing:.13em; padding:.2rem .6rem .6rem }
.toc-list{ list-style:none; margin:0; padding:0; counter-reset:none }
.toc-item{
  display:flex; align-items:flex-start; gap:.6rem; padding:.5rem .6rem; margin-bottom:2px;
  border-radius:11px; text-decoration:none; color:var(--ink-2); transition:background .15s,color .15s;
}
.toc-item:hover{ background:var(--page); color:var(--ink) }
.toc-item.active{ background:var(--blue-s); color:var(--ink) }
.toc-item.active .toc-no{ background:var(--blue); color:#fff }
.toc-no{ flex:0 0 24px; height:24px; border-radius:8px; background:var(--line);
  color:var(--ink-2); font-size:.72rem; font-weight:800; display:grid; place-items:center; margin-top:3px }
.toc-body{ flex:1; min-width:0; line-height:1.42 }
.toc-name{ display:block; font-weight:700; font-size:.895rem }
.toc-sub{ display:block; font-size:.735rem; color:var(--ink-3); margin-top:1px }
.toc-check{ opacity:0; color:var(--mint); font-weight:900; margin-top:3px; transition:opacity .2s }
.toc-item.done .toc-check{ opacity:1 }
.toc-item.done .toc-no{ background:var(--mint-s); color:var(--mint) }
.toc-foot{ padding:1rem .6rem 2rem }

/* ── 종이 ────────────────────────────────── */
.nb-paper{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:clamp(1.15rem,3.4vw,2.9rem); margin-bottom:1.5rem;
  max-width:920px; margin-inline:auto;
}
.nb-paper h2,.nb-paper h3,.nb-paper h4{ letter-spacing:-.025em; font-weight:800 }
.cell-md h4{ font-size:1.24rem; margin:2.4rem 0 .9rem; padding-left:.7rem;
  border-left:4px solid var(--blue); line-height:1.4 }
.cell-md p{ margin-bottom:1.05rem }
.cell-md ul,.cell-md ol{ margin-bottom:1.1rem; padding-left:1.35rem }
.cell-md li{ margin-bottom:.42rem }
.cell-md b{ font-weight:800 }
:is(.cell-md,.note-b,.quiz-q,figcaption) code{
  background:var(--blue-s); color:var(--ink); padding:.1em .42em; border-radius:6px;
  font-size:.855em; font-weight:600;
}

/* ── 홈 ──────────────────────────────────── */
.hero{ max-width:920px; margin:0 auto 1.5rem; background:var(--paper);
  border:1px solid var(--line); border-radius:var(--radius); box-shadow:var(--shadow); overflow:hidden }
.hero-img{ width:100%; display:block; border-bottom:1px solid var(--line) }
.hero-body{ padding:clamp(1.3rem,3.6vw,2.7rem) }
.hero h1{ font-size:clamp(1.65rem,4.6vw,2.5rem); font-weight:900; letter-spacing:-.035em;
  line-height:1.33; margin-bottom:.9rem }
.hero-lead{ color:var(--ink-2); font-size:1.03rem; margin-bottom:1.2rem }
.hero-tags{ display:flex; flex-wrap:wrap; gap:.4rem; margin-bottom:1.6rem }
.hero-tags span{ background:var(--page); border:1px solid var(--line); border-radius:99px;
  padding:.24rem .72rem; font-size:.8rem; font-weight:700; color:var(--ink-2) }
.hero-cta{ font-weight:800; border-radius:12px; padding:.62rem 1.5rem; margin-right:.5rem }
.home-h{ font-size:1.35rem; margin-bottom:1.3rem }
.how-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(215px,1fr)); gap:.9rem }
.how{ background:var(--page); border:1px solid var(--line); border-radius:13px; padding:1.1rem }
.how span{ font-size:1.7rem; display:block; margin-bottom:.35rem }
.how b{ display:block; margin-bottom:.3rem; font-size:.97rem }
.how p{ font-size:.855rem; color:var(--ink-2); margin:0; line-height:1.62 }
.curriculum{ display:grid; gap:.5rem }
.cur-card{ display:flex; align-items:center; gap:.9rem; padding:.85rem 1rem; border-radius:12px;
  border:1px solid var(--line); background:var(--page); text-decoration:none; color:var(--ink);
  transition:transform .13s,border-color .13s,box-shadow .13s }
.cur-card:hover{ transform:translateX(4px); border-color:var(--blue); box-shadow:var(--shadow) }
.cur-no{ flex:0 0 42px; height:42px; border-radius:11px; background:var(--paper); border:1px solid var(--line);
  display:grid; place-items:center; font-weight:900; color:var(--ink-3); font-size:.92rem }
.cur-card.done .cur-no{ background:var(--mint-s); color:var(--mint); border-color:transparent }
.cur-body{ flex:1; min-width:0 }
.cur-title{ font-weight:800; font-size:.97rem; line-height:1.4 }
.cur-sub{ font-size:.8rem; color:var(--ink-3) }
.cur-check{ opacity:0; color:var(--mint); font-weight:900; font-size:1.1rem }
.cur-card.done .cur-check{ opacity:1 }

/* ── 레슨 머리 ───────────────────────────── */
.lesson-head{ border-bottom:2px solid var(--line); padding-bottom:1.3rem; margin-bottom:1.7rem }
.lh-no{ display:inline-block; background:var(--blue-s); color:var(--blue); font-weight:800;
  font-size:.75rem; padding:.2rem .7rem; border-radius:99px; margin-bottom:.65rem; letter-spacing:.02em }
[data-bs-theme="dark"] .lh-no{ color:#93c5fd }
.lesson-head h1{ font-size:clamp(1.5rem,4.2vw,2.1rem); font-weight:900; letter-spacing:-.035em;
  line-height:1.34; margin-bottom:.4rem }
.lh-sub{ color:var(--ink-3); font-size:1rem; margin:0 }
.lesson-figure{ margin:0 0 2rem }
.lesson-figure img{ width:100%; border-radius:13px; border:1px solid var(--line); display:block }
.lesson-figure figcaption{ text-align:center; font-size:.87rem; color:var(--ink-3); margin-top:.6rem }

/* ── 셀 공통 ─────────────────────────────── */
.cell{ margin-bottom:1.45rem }
.cell-cap{ font-size:.83rem; color:var(--ink-3); margin-bottom:.42rem; font-weight:600 }

/* ── 노트 박스 ───────────────────────────── */
.note{ border-radius:13px; padding:1.05rem 1.2rem; border:1px solid; border-left-width:5px }
.note-h{ font-weight:800; margin-bottom:.5rem; font-size:.99rem }
.note-b{ font-size:.935rem; color:var(--ink-2) }
.note-b ul{ margin:.4rem 0 0; padding-left:1.2rem } .note-b li{ margin-bottom:.35rem }
.note-b p:last-child{ margin-bottom:0 }
.note-tip  { background:var(--blue-s);  border-color:var(--blue) }
.note-warn { background:var(--amber-s); border-color:var(--amber) }
.note-key  { background:var(--mint-s);  border-color:var(--mint) }
.note-story{ background:var(--violet-s);border-color:var(--violet) }
.mini{ background:rgba(15,23,42,.07); border-radius:8px; padding:.6rem .8rem; font-size:.82rem;
  margin:.5rem 0; overflow-x:auto; white-space:pre; line-height:1.6 }
[data-bs-theme="dark"] .mini{ background:rgba(255,255,255,.07) }

/* ── 코드 셀 ─────────────────────────────── */
.cell-code{ border:1px solid var(--line); border-radius:13px; overflow:hidden; background:var(--paper) }
.cell-code .cell-cap{ padding:.6rem .9rem 0; margin:0 }
.code-head{ display:flex; align-items:center; gap:.55rem; padding:.55rem .8rem;
  background:var(--page); border-bottom:1px solid var(--line); flex-wrap:wrap }
.badge-lang{ font-size:.68rem; font-weight:900; padding:.16rem .55rem; border-radius:6px; letter-spacing:.05em }
.badge-py { background:#3b82f6; color:#fff } .badge-sql{ background:#10b981; color:#fff }
.run-where{ font-size:.74rem; color:var(--ink-3) }
.btn-run{ background:var(--ink); color:var(--paper); font-weight:800; border-radius:8px;
  padding:.24rem .82rem; font-size:.8rem; border:0; white-space:nowrap }
.btn-run:hover{ opacity:.86; color:var(--paper) }
.btn-run:disabled{ opacity:.45 }
.btn-ghost{ border:1px solid var(--line-2); color:var(--ink-3); border-radius:8px;
  padding:.24rem .55rem; font-size:.8rem; background:transparent }
.btn-ghost:hover{ color:var(--ink); border-color:var(--ink-3) }
.code-area{
  width:100%; border:0; outline:0; resize:none; display:block;
  background:var(--code-bg); color:var(--code-ink);
  padding:.95rem 1.05rem; font-size:.855rem; line-height:1.72; tab-size:4; overflow:hidden;
}
.code-area:focus{ box-shadow:inset 0 0 0 2px var(--blue) }
.cell-out{ border-top:1px solid var(--line); background:var(--page); padding:.8rem 1rem;
  font-size:.85rem; max-height:520px; overflow:auto }
.out-pre{ margin:0; white-space:pre-wrap; font-size:.845rem; line-height:1.68; color:var(--ink) }
.out-err{ color:#dc2626; font-weight:600 }
[data-bs-theme="dark"] .out-err{ color:#f87171 }
.out-msg{ color:var(--mint); font-weight:700; margin:.15rem 0 }
.out-sql{ font-size:.76rem; color:var(--ink-3); margin:.55rem 0 .25rem; white-space:pre-wrap }
.out-meta{ font-size:.74rem; color:var(--ink-3); margin-top:.5rem; text-align:right }
.out-loading{ color:var(--ink-3); font-size:.85rem }
.res-table{ width:100%; border-collapse:collapse; font-size:.82rem; margin:.3rem 0 }
.res-table th{ background:var(--blue-s); font-weight:800; padding:.4rem .65rem;
  border:1px solid var(--line); white-space:nowrap; text-align:left }
.res-table td{ padding:.36rem .65rem; border:1px solid var(--line); background:var(--paper) }
.res-table td.num{ text-align:right; font-variant-numeric:tabular-nums }
.res-table td.null{ color:var(--ink-3); font-style:italic }
.res-wrap{ overflow-x:auto; border-radius:8px }

/* ── 퀴즈 ────────────────────────────────── */
.quiz{ background:var(--violet-s); border:1px solid var(--violet); border-radius:13px; padding:1.15rem 1.25rem }
.quiz-h{ font-weight:900; margin-bottom:.55rem; font-size:.95rem }
.quiz-q{ font-weight:700; margin-bottom:.9rem; line-height:1.62 }
.quiz-opts{ display:grid; gap:.42rem }
.quiz-opt{ display:flex; align-items:flex-start; gap:.65rem; text-align:left; width:100%;
  background:var(--paper); border:1.5px solid var(--line); border-radius:10px;
  padding:.62rem .85rem; font-size:.9rem; color:var(--ink); transition:all .14s; line-height:1.55 }
.quiz-opt:hover:not(:disabled){ border-color:var(--violet); transform:translateX(3px) }
.qo-n{ flex:0 0 22px; height:22px; border-radius:6px; background:var(--page); color:var(--ink-3);
  font-weight:900; font-size:.74rem; display:grid; place-items:center; margin-top:1px }
.quiz-opt.correct{ border-color:var(--mint); background:var(--mint-s) }
.quiz-opt.correct .qo-n{ background:var(--mint); color:#fff }
.quiz-opt.wrong{ border-color:var(--rose); background:var(--rose-s) }
.quiz-opt.wrong .qo-n{ background:var(--rose); color:#fff }
.quiz-explain{ margin-top:.85rem; background:var(--paper); border-radius:10px;
  padding:.75rem .95rem; font-size:.885rem; color:var(--ink-2); line-height:1.68 }

/* ── 레슨 하단 내비 ──────────────────────── */
.lesson-nav{ display:grid; grid-template-columns:1fr auto 1fr; gap:.6rem; align-items:stretch;
  margin-top:2.6rem; padding-top:1.6rem; border-top:2px solid var(--line) }
.ln-btn{ display:flex; flex-direction:column; justify-content:center; gap:.1rem; padding:.75rem 1rem;
  border:1px solid var(--line); border-radius:12px; text-decoration:none; color:var(--ink);
  background:var(--page); transition:border-color .14s,transform .14s; min-width:0 }
.ln-btn:hover{ border-color:var(--blue); transform:translateY(-2px); color:var(--ink) }
.ln-btn small{ color:var(--ink-3); font-size:.73rem; font-weight:700 }
.ln-btn b{ font-size:.88rem; overflow:hidden; text-overflow:ellipsis; white-space:nowrap }
.ln-next{ text-align:right }
.ln-done{ border:0; border-radius:12px; background:var(--mint); color:#fff; font-weight:800;
  padding:.75rem 1.15rem; font-size:.87rem; white-space:nowrap }
.ln-done.is-done{ background:var(--mint-s); color:var(--mint) }
@media (max-width:640px){
  .lesson-nav{ grid-template-columns:1fr 1fr; }
  .ln-done{ grid-column:1/-1; order:-1 }
}

.nb-foot{ text-align:center; color:var(--ink-3); font-size:.85rem; padding:2rem 1rem 0; max-width:920px; margin:0 auto }
.nb-foot p{ margin:.2rem 0 }
.nb-foot .nb-copy{ margin-top:.9rem; padding-top:.9rem; border-top:1px solid var(--line); opacity:.8 }

/* ── 토스트 ──────────────────────────────── */
.nb-toast{ position:fixed; bottom:1.4rem; left:50%; transform:translateX(-50%) translateY(1rem);
  background:var(--ink); color:var(--paper); padding:.62rem 1.15rem; border-radius:11px;
  font-size:.87rem; font-weight:700; z-index:2000; opacity:0; transition:all .25s; box-shadow:var(--shadow) }
.nb-toast.show{ opacity:1; transform:translateX(-50%) translateY(0) }

/* ══════════════════════════════════════════════════════════
   레슨 본문 전용 요소
   ══════════════════════════════════════════════════════════ */
.demo-table{ width:100%; border-collapse:collapse; font-size:.87rem; margin:.8rem 0 1.1rem }
.demo-table th{ background:var(--blue-s); font-weight:800; padding:.5rem .7rem;
  border:1px solid var(--line-2); text-align:left; white-space:nowrap }
.demo-table td{ padding:.44rem .7rem; border:1px solid var(--line); background:var(--paper) }
.demo-table td.dup{ background:var(--rose-s) }
.demo-table th.pk,.demo-table td.pk{ background:var(--amber-s); font-weight:800 }
.demo-table th.fk,.demo-table td.fk{ background:var(--amber-s) }
.demo-table code{ background:none!important; padding:0!important; font-size:.83em }

.codeblock{ background:var(--code-bg); color:var(--code-ink); border-radius:11px;
  padding:1rem 1.1rem; font-size:.83rem; line-height:1.72; overflow-x:auto; margin:.7rem 0 1.1rem }

/* 비유 카드 3단 */
.metaphor-row{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:.7rem; margin:1.1rem 0 }
.metaphor-card{ background:var(--page); border:1px solid var(--line); border-radius:13px;
  padding:1rem .8rem; text-align:center }
.mc-icon{ font-size:2rem; line-height:1 } .mc-t{ font-weight:800; margin:.4rem 0 .15rem }
.mc-d{ font-size:.82rem; color:var(--ink-3) }

/* 좌우 비교 */
.compare-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(245px,1fr)); gap:.85rem; margin:1.1rem 0 }
.cmp-box{ border-radius:13px; padding:1rem 1.1rem; border:1.5px solid }
.cmp-bad{ background:var(--rose-s);  border-color:var(--rose) }
.cmp-good{ background:var(--mint-s); border-color:var(--mint) }
.cmp-neutral{ background:var(--blue-s); border-color:var(--blue) }
.cmp-h{ font-weight:800; margin-bottom:.5rem }
.cmp-box pre{ background:rgba(15,23,42,.08); border-radius:8px; padding:.6rem .75rem;
  font-size:.79rem; margin:.4rem 0; overflow-x:auto; line-height:1.6 }
[data-bs-theme="dark"] .cmp-box pre{ background:rgba(0,0,0,.32) }
.cmp-n{ font-size:.81rem; color:var(--ink-2); margin-top:.3rem }
.cmp-box p{ font-size:.87rem; margin:0 }

/* 학생증 */
.idcard{ max-width:330px; margin:1.2rem auto; background:var(--paper); border:2px solid var(--blue);
  border-radius:15px; overflow:hidden; box-shadow:var(--shadow) }
.idcard-h{ background:var(--blue); color:#fff; font-weight:800; padding:.6rem 1rem; font-size:.95rem }
.idcard-row{ display:flex; justify-content:space-between; padding:.55rem 1.05rem;
  border-bottom:1px solid var(--line); font-size:.9rem }
.idcard-row:last-child{ border-bottom:0 }
.idcard-row span{ color:var(--ink-3); font-weight:600 }

.deflist{ background:var(--page); border:1px solid var(--line); border-radius:12px;
  padding:1rem 1.2rem; margin:1.1rem 0; font-size:.92rem }
.deflist ul{ margin:.55rem 0 0 }

/* CRUD 4칸 */
.crud-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:.7rem; margin:1.2rem 0 }
.crud-card{ border-radius:13px; padding:1rem; border:1.5px solid }
.c-c{ background:var(--mint-s);  border-color:var(--mint) }
.c-r{ background:var(--blue-s);  border-color:var(--blue) }
.c-u{ background:var(--amber-s); border-color:var(--amber) }
.c-d{ background:var(--rose-s);  border-color:var(--rose) }
.cc-l{ font-size:1.8rem; font-weight:900; line-height:1; opacity:.55 }
.cc-t{ font-weight:800; margin:.25rem 0 .15rem; font-size:.95rem }
.cc-d{ font-size:.8rem; color:var(--ink-2) }

/* 표 해부도 */
.table-anatomy{ margin:1.2rem 0 }
.anat-notes{ display:grid; gap:.35rem; font-size:.84rem; color:var(--ink-2) }
.anat{ padding:.4rem .7rem; border-radius:8px; background:var(--page); border-left:3px solid var(--line-2) }
.n-head{ border-left-color:var(--blue) } .n-row{ border-left-color:var(--mint) } .n-col{ border-left-color:var(--coral) }

/* 능력 4칸 */
.power-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:.7rem; margin:1.2rem 0 }
.power{ background:var(--page); border:1px solid var(--line); border-radius:13px; padding:1rem }
.power span{ font-size:1.6rem; display:block } .power b{ display:block; margin:.3rem 0 .2rem }
.power p{ font-size:.82rem; color:var(--ink-2); margin:0; line-height:1.6 }

/* 계층 사다리 */
.ladder{ display:grid; gap:.42rem; margin:1.2rem 0 }
.rung{ display:flex; align-items:center; gap:.9rem; padding:.65rem 1rem; border-radius:11px;
  color:#fff; font-size:.9rem }
.rung b{ flex:0 0 96px; font-weight:900 }
.rung span{ opacity:.94; font-size:.85rem }
.r1{ background:#94a3b8; margin-right:44% } .r2{ background:#60a5fa; margin-right:33% }
.r3{ background:#3b82f6; margin-right:22% } .r4{ background:#8b5cf6; margin-right:11% }
.r5{ background:#6d28d9 }
@media (max-width:560px){ .rung{ margin-right:0!important } .rung b{ flex-basis:74px; font-size:.83rem } }

/* 필드 사양 */
.field-spec{ display:flex; align-items:center; gap:.9rem; flex-wrap:wrap; background:var(--page);
  border:1px solid var(--line); border-radius:13px; padding:1rem 1.1rem; margin:1.1rem 0 }
.fs-name{ font-weight:900; font-size:1.05rem; background:var(--coral-s); border-radius:9px;
  padding:.35rem .85rem; border:1.5px solid var(--coral) }
.fs-arrow{ color:var(--ink-3); font-size:1.2rem }
.fs-rules{ flex:1; min-width:190px; font-size:.85rem; color:var(--ink-2); line-height:2.1 }
.tag{ font-size:.72rem; font-weight:800; padding:.15rem .5rem; border-radius:6px; margin-right:.35rem;
  background:var(--line); color:var(--ink-2) }
.t-type{ background:var(--blue); color:#fff } .t-nn{ background:var(--violet); color:#fff }
.t-ck{ background:var(--mint); color:#fff }
.type-table td:first-child{ white-space:nowrap }

/* 동작 ↔ SQL 표 */
.map-table code{ font-size:.78rem }
.pill{ display:inline-grid; place-items:center; width:22px; height:22px; border-radius:6px;
  font-weight:900; font-size:.74rem; color:#fff }
.p-c{ background:var(--mint) } .p-r{ background:var(--blue) }
.p-u{ background:var(--amber) } .p-d{ background:var(--rose) }

/* 나쁜 표 */
.bad-table-wrap{ margin:1.1rem 0 }
.bt-label{ font-weight:800; font-size:.9rem; margin-bottom:.4rem; color:var(--rose) }
.problem-list{ display:grid; gap:.55rem; margin:1.1rem 0 }
.prob{ background:var(--rose-s); border-left:4px solid var(--rose); border-radius:10px; padding:.75rem 1rem }
.prob b{ font-size:.92rem } .prob p{ margin:.2rem 0 0; font-size:.86rem; color:var(--ink-2) }

/* 두 표 연결 */
.two-table{ display:grid; grid-template-columns:1fr auto 1fr; gap:.7rem; align-items:center; margin:1.2rem 0 }
.tt{ min-width:0 } .tt-h{ font-weight:800; font-size:.85rem; margin-bottom:.35rem; color:var(--ink-2) }
.tt .demo-table{ margin:0; font-size:.8rem } .tt .demo-table th,.tt .demo-table td{ padding:.32rem .5rem }
.tt-link{ text-align:center; font-size:1.5rem; color:var(--amber) }
.tt-link span{ display:block; font-size:.68rem; color:var(--ink-3) }
@media (max-width:700px){ .two-table{ grid-template-columns:1fr } .tt-link{ transform:rotate(90deg) } }
.keydef{ display:grid; gap:.5rem; margin:1rem 0; font-size:.88rem }
.keydef>div{ background:var(--page); border-radius:10px; padding:.7rem .9rem; border:1px solid var(--line) }
.kd{ display:inline-block; font-weight:900; font-size:.74rem; padding:.15rem .55rem;
  border-radius:6px; margin-right:.5rem; color:#fff }
.pk-c{ background:var(--amber) } .fk-c{ background:var(--coral) }

/* 흐름선 */
.flowline{ display:flex; align-items:center; justify-content:center; gap:.5rem; flex-wrap:wrap; margin:1.3rem 0 }
.fl-node{ background:var(--page); border:1.5px solid var(--line-2); border-radius:11px;
  padding:.65rem 1rem; font-weight:800; font-size:.88rem; text-align:center }
.fl-em{ background:var(--violet-s); border-color:var(--violet) }
.fl-node small{ display:block; font-weight:600; color:var(--ink-3); font-size:.72rem }
.fl-arrow{ color:var(--ink-3); font-size:.76rem; font-weight:700 }
.dbms-table td:first-child{ white-space:nowrap }

/* 저장소 4칸 */
.storage-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(215px,1fr)); gap:.65rem; margin:1.2rem 0 }
.stg{ background:var(--page); border:1px solid var(--line); border-left:4px solid var(--blue);
  border-radius:11px; padding:.85rem 1rem }
.stg b{ font-size:.92rem } .stg p{ font-size:.82rem; color:var(--ink-2); margin:.25rem 0 0; line-height:1.6 }

.verdict{ display:grid; grid-template-columns:repeat(auto-fit,minmax(235px,1fr)); gap:.8rem; margin:1.2rem 0 }
.v-ok,.v-no{ border-radius:13px; padding:1rem 1.15rem; border:1.5px solid; font-size:.88rem }
.v-ok{ background:var(--mint-s); border-color:var(--mint) }
.v-no{ background:var(--rose-s); border-color:var(--rose) }
.v-ok ul,.v-no ul{ margin:.5rem 0 0; padding-left:1.15rem } .v-ok li,.v-no li{ margin-bottom:.28rem }
.lead-next{ font-size:1.02rem; font-weight:700; text-align:center; background:var(--blue-s);
  border-radius:12px; padding:1rem; margin-top:1.3rem }

/* 요청-응답 */
.reqres{ display:grid; grid-template-columns:1fr auto 1fr; gap:.7rem; align-items:center; margin:1.3rem 0 }
.rr-box{ border-radius:13px; padding:1rem 1.1rem; border:1.5px solid; min-width:0 }
.rr-front{ background:var(--blue-s); border-color:var(--blue) }
.rr-back{ background:var(--mint-s); border-color:var(--mint) }
.rr-t{ font-weight:900; font-size:1rem } .rr-s{ font-size:.78rem; color:var(--ink-3); margin-bottom:.5rem }
.rr-box ul{ margin:0; padding-left:1.1rem; font-size:.82rem; color:var(--ink-2) }
.rr-box li{ margin-bottom:.2rem }
.rr-mid{ display:grid; gap:.4rem; min-width:118px }
.rr-a{ font-size:.72rem; font-weight:800; text-align:center; padding:.35rem .5rem; border-radius:8px; color:#fff }
.rr-a small{ display:block; font-weight:600; opacity:.9 }
.rr-req{ background:var(--blue) } .rr-res{ background:var(--coral) }
@media (max-width:700px){ .reqres{ grid-template-columns:1fr } }

/* SQLite 특징 */
.sqlite-facts{ display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr)); gap:.7rem; margin:1.2rem 0 }
.sf{ background:var(--page); border:1px solid var(--line); border-radius:13px; padding:1rem }
.sf span{ font-size:1.55rem } .sf b{ display:block; margin:.25rem 0 .2rem }
.sf p{ font-size:.81rem; color:var(--ink-2); margin:0; line-height:1.6 }
.badge-sql{ display:inline-block }

/* Flask 흐름 */
.flask-flow{ display:flex; align-items:center; justify-content:center; gap:.5rem;
  flex-wrap:wrap; margin:1.3rem 0 }
.ff{ background:var(--page); border:1.5px solid var(--line-2); border-radius:12px;
  padding:.7rem .9rem; text-align:center; font-size:1.35rem; min-width:118px }
.ff b{ display:block; font-size:.87rem; margin-top:.15rem }
.ff small{ display:block; font-size:.68rem; color:var(--ink-3); font-weight:600 }
.ff-em{ background:var(--violet-s); border-color:var(--violet) }
.ff-a{ color:var(--ink-3); font-weight:800; font-size:.9rem }
.ff-a.back{ flex-basis:100%; text-align:center; font-size:.75rem; color:var(--coral) }

.route-table td{ font-size:.84rem }
.m{ font-weight:900; font-size:.68rem; padding:.14rem .48rem; border-radius:5px; color:#fff }
.get{ background:var(--blue) } .post{ background:var(--mint) }
.put{ background:var(--amber) } .del{ background:var(--rose) }

.sec-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(255px,1fr)); gap:.8rem; margin:1.2rem 0 }
.sec{ border-radius:13px; padding:1rem 1.1rem; border:1.5px solid }
.sec.bad{ background:var(--rose-s); border-color:var(--rose) }
.sec.good{ background:var(--mint-s); border-color:var(--mint) }
.sec-h{ font-weight:800; margin-bottom:.4rem; font-size:.92rem }
.sec p{ font-size:.83rem; color:var(--ink-2); margin:.35rem 0 0 }

/* ERD */
.erd{ display:grid; grid-template-columns:1fr auto 1fr auto 1fr; gap:.5rem; align-items:center; margin:1.3rem 0 }
.erd-t{ background:var(--paper); border:1.5px solid var(--line-2); border-radius:11px; overflow:hidden; min-width:0 }
.erd-h{ background:var(--blue); color:#fff; font-weight:800; padding:.45rem .6rem; font-size:.8rem }
.erd-f{ padding:.32rem .6rem; font-size:.75rem; border-bottom:1px solid var(--line);
  font-family:'JetBrains Mono',monospace; white-space:nowrap; overflow:hidden; text-overflow:ellipsis }
.erd-f:last-child{ border-bottom:0 }
.erd-f.pk{ background:var(--amber-s); font-weight:700 } .erd-f.fk{ background:var(--coral-s) }
.erd-rel{ text-align:center; color:var(--ink-3) }
.erd-line{ font-weight:900; font-size:.78rem; color:var(--violet) }
.erd-rel small{ font-size:.64rem; line-height:1.35; display:block; margin-top:.2rem }
@media (max-width:820px){ .erd{ grid-template-columns:1fr } .erd-rel{ padding:.2rem 0 } }

.journey{ display:grid; gap:.45rem; margin:1.1rem 0 }
.jn{ display:flex; gap:.85rem; align-items:baseline; background:var(--page);
  border-radius:10px; padding:.6rem .9rem; font-size:.88rem }
.jn b{ flex:0 0 46px; color:var(--blue); font-weight:900; font-size:.82rem }
.jn span{ color:var(--ink-2) }
.next-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(195px,1fr)); gap:.65rem; margin:1.1rem 0 }
.nx{ background:var(--page); border:1px solid var(--line); border-radius:11px; padding:.85rem 1rem }
.nx b{ font-size:.9rem } .nx p{ font-size:.79rem; color:var(--ink-2); margin:.2rem 0 0; line-height:1.55 }
.finale{ text-align:center; font-size:1.05rem; background:linear-gradient(135deg,var(--violet-s),var(--mint-s));
  border-radius:14px; padding:1.4rem; margin-top:1.6rem; line-height:1.9 }

/* ══════════════════════════════════════════════════════════
   인터랙티브 위젯
   ══════════════════════════════════════════════════════════ */
.widget{ border:1px solid var(--line); border-radius:14px; overflow:hidden; background:var(--paper) }
.widget .cell-cap{ padding:.7rem .95rem 0; margin:0 }
.widget-body{ padding:1rem }
.w-grid{ display:grid; grid-template-columns:1fr 1fr; gap:.9rem }
@media (max-width:780px){ .w-grid{ grid-template-columns:1fr } }
.w-panel{ background:var(--page); border:1px solid var(--line); border-radius:12px; padding:.85rem .95rem }
.w-h{ font-weight:800; font-size:.85rem; margin-bottom:.6rem; display:flex; align-items:center;
  gap:.4rem; justify-content:space-between }
.w-note{ font-size:.78rem; color:var(--ink-3); margin-top:.5rem; line-height:1.6 }
.w-empty{ color:var(--ink-3); font-size:.85rem; text-align:center; padding:1rem 0 }
.w-row{ display:flex; align-items:center; gap:.5rem; margin-bottom:.4rem }
.w-inp{ flex:1; min-width:0; border:1px solid var(--line-2); border-radius:9px;
  padding:.42rem .7rem; font-size:.87rem; background:var(--paper); color:var(--ink) }
.w-inp:focus{ outline:2px solid var(--blue); outline-offset:-1px }
.w-btn{ border:0; border-radius:9px; padding:.42rem .9rem; font-weight:800; font-size:.83rem;
  background:var(--blue); color:#fff; white-space:nowrap }
.w-btn:hover{ filter:brightness(1.08) } .w-btn:disabled{ opacity:.5 }
.w-btn.sec{ background:var(--line); color:var(--ink-2) }
.w-btn.ok{ background:var(--mint) } .w-btn.dan{ background:var(--rose) }
.w-btn.sm{ padding:.22rem .55rem; font-size:.75rem; border-radius:7px }

/* SQL 로그 */
.w-log{ background:var(--code-bg); color:var(--code-ink); border-radius:10px; padding:.7rem .85rem;
  font-family:'JetBrains Mono',monospace; font-size:.745rem; line-height:1.7;
  max-height:290px; overflow:auto; white-space:pre-wrap }
.w-log .lg{ padding:.22rem 0; border-bottom:1px solid rgba(255,255,255,.07) }
.w-log .lg:last-child{ border-bottom:0 }
.w-log .lg-t{ color:#64748b; font-size:.68rem }
.w-log .lg-p{ color:#fbbf24 }
.w-log .lg-new{ animation:flash .8s ease }
@keyframes flash{ from{ background:rgba(59,130,246,.35) } to{ background:transparent } }

/* 할 일 목록 */
.todo-list{ list-style:none; margin:0; padding:0 }
.todo-list li{ display:flex; align-items:center; gap:.6rem; padding:.5rem .2rem;
  border-bottom:1px solid var(--line); font-size:.9rem }
.todo-list li:last-child{ border-bottom:0 }
.todo-list .tid{ color:var(--ink-3); font-size:.72rem; font-family:'JetBrains Mono',monospace; width:20px }
.todo-list .ttl{ flex:1; min-width:0 }
.todo-list li.done .ttl{ text-decoration:line-through; color:var(--ink-3) }
.todo-chk{ width:19px; height:19px; border-radius:6px; border:2px solid var(--line-2);
  background:var(--paper); display:grid; place-items:center; font-size:.72rem; color:#fff; padding:0 }
.todo-list li.done .todo-chk{ background:var(--mint); border-color:var(--mint) }

/* 인덱스 실험실 */
.lab-ctl{ display:flex; flex-wrap:wrap; gap:.5rem; align-items:center; margin-bottom:.8rem }
.lab-res{ display:grid; grid-template-columns:1fr 1fr; gap:.7rem; margin-top:.5rem }
@media (max-width:560px){ .lab-res{ grid-template-columns:1fr } }
.lab-card{ border-radius:12px; padding:.9rem 1rem; border:1.5px solid; text-align:center }
.lab-slow{ background:var(--rose-s);  border-color:var(--rose) }
.lab-fast{ background:var(--mint-s);  border-color:var(--mint) }
.lab-card b{ display:block; font-size:.85rem; margin-bottom:.15rem }
.lab-time{ font-size:1.65rem; font-weight:900; font-variant-numeric:tabular-nums; line-height:1.25 }
.lab-card small{ color:var(--ink-2); font-size:.74rem }
.lab-verdict{ text-align:center; font-weight:800; margin-top:.75rem; padding:.7rem;
  background:var(--amber-s); border-radius:11px; font-size:.93rem }
.lab-bar{ height:11px; border-radius:99px; background:var(--line); overflow:hidden; margin-top:.45rem }
.lab-bar i{ display:block; height:100%; border-radius:99px; transition:width .7s ease }

/* 상품 격자 */
.shop-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(104px,1fr)); gap:.55rem }
.sp{ background:var(--paper); border:1px solid var(--line); border-radius:11px; padding:.7rem .6rem; text-align:center }
.sp-e{ font-size:1.7rem; line-height:1.15 }
.sp-n{ font-weight:700; font-size:.81rem; margin:.15rem 0; line-height:1.35 }
.sp-p{ font-weight:900; font-size:.85rem; color:var(--blue) }
.sp-s{ font-size:.7rem; color:var(--ink-3); margin-bottom:.4rem }
.sp-s.out{ color:var(--rose); font-weight:800 }
.cart-list{ list-style:none; margin:0; padding:0 }
.cart-list li{ display:flex; align-items:center; gap:.5rem; padding:.42rem .1rem;
  border-bottom:1px solid var(--line); font-size:.85rem }
.cart-list .cn{ flex:1; min-width:0 }
.cart-list .cq{ color:var(--ink-3); font-size:.78rem }
.cart-list .cs{ font-weight:800; font-variant-numeric:tabular-nums }
.cart-total{ display:flex; justify-content:space-between; align-items:baseline; padding:.7rem .1rem 0;
  margin-top:.4rem; border-top:2px solid var(--line); font-weight:900 }
.cart-total .amt{ font-size:1.2rem; color:var(--blue) }
.order-list{ list-style:none; margin:.4rem 0 0; padding:0; font-size:.79rem; color:var(--ink-2) }
.order-list li{ display:flex; justify-content:space-between; padding:.24rem 0;
  border-bottom:1px dashed var(--line) }
.w-alert{ background:var(--rose-s); color:var(--rose); border-radius:9px; padding:.5rem .75rem;
  font-size:.83rem; font-weight:700; margin-bottom:.6rem }
.w-ok{ background:var(--mint-s); color:var(--mint); border-radius:9px; padding:.5rem .75rem;
  font-size:.83rem; font-weight:700; margin-bottom:.6rem }

/* 방명록 */
.gb-list{ list-style:none; margin:0; padding:0; max-height:290px; overflow:auto }
.gb-list li{ padding:.55rem .2rem; border-bottom:1px solid var(--line); font-size:.87rem }
.gb-list li:last-child{ border-bottom:0 }
.gb-nick{ font-weight:800; color:var(--blue) }
.gb-time{ float:right; font-size:.7rem; color:var(--ink-3) }
.gb-msg{ display:block; color:var(--ink-2); margin-top:.1rem; line-height:1.6 }
.gb-mine{ background:var(--blue-s); border-radius:8px; padding-inline:.5rem }

/* 브라우저 저장소 */
.ls-view{ background:var(--code-bg); color:var(--code-ink); border-radius:10px; padding:.8rem;
  font-family:'JetBrains Mono',monospace; font-size:.76rem; line-height:1.7; white-space:pre-wrap;
  min-height:78px; max-height:200px; overflow:auto }
.ls-badge{ display:inline-block; font-size:.68rem; font-weight:800; padding:.14rem .5rem;
  border-radius:6px; background:var(--amber-s); color:var(--amber) }

/* Pyodide 로딩 */
.py-loading{ display:flex; align-items:center; gap:.55rem; color:var(--ink-3); font-size:.83rem }
.spin{ width:14px; height:14px; border:2px solid var(--line-2); border-top-color:var(--blue);
  border-radius:50%; animation:sp .7s linear infinite }
@keyframes sp{ to{ transform:rotate(360deg) } }


/* 풀스택 4층 구조 (SQLite3 · Flask · Jinja2 · Bootstrap) */
.stack{ display:flex; flex-direction:column; gap:.5rem; margin:1.2rem 0 }
.stk{ position:relative; display:grid; grid-template-columns:auto 1fr; column-gap:.9rem;
  align-items:center; padding:.75rem 1rem .75rem .9rem; border-radius:13px;
  border:1.5px solid var(--line); background:var(--page) }
.stk b{ font-size:.98rem; grid-column:2 }
.stk p{ margin:.1rem 0 0; grid-column:2; font-size:.82rem; color:var(--ink-3); line-height:1.5 }
.stk-n{ grid-row:1 / span 2; font-size:.7rem; font-weight:900; letter-spacing:.03em;
  padding:.3rem .5rem; border-radius:8px; background:var(--paper);
  border:1.5px solid var(--line-2); color:var(--ink-2); white-space:nowrap }
.stk-4{ background:var(--violet-s); border-color:var(--violet) }
.stk-3{ background:var(--coral-s);  border-color:var(--coral) }
.stk-2{ background:var(--mint-s);   border-color:var(--mint) }
.stk-1{ background:var(--blue-s);   border-color:var(--blue) }
.stk-here::after{ content:"지금 여기"; position:absolute; top:-.6rem; right:.8rem;
  font-size:.68rem; font-weight:800; padding:.15rem .5rem; border-radius:99px;
  background:var(--ink); color:var(--paper) }
@media (max-width:520px){ .stk p{ font-size:.78rem } }

/* 19강 · 로그인 실습실 위젯 */
.auth-me{ margin-bottom:.7rem }
.auth-on, .auth-off{ display:flex; flex-wrap:wrap; align-items:center; gap:.5rem;
  padding:.6rem .8rem; border-radius:11px; font-size:.88rem; border:1.5px solid var(--line) }
.auth-on{ background:var(--mint-s); border-color:var(--mint) }
.auth-off{ background:var(--page); color:var(--ink-3) }
.auth-sid{ font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:.75rem;
  background:var(--paper); border:1px solid var(--line); border-radius:7px; padding:.1rem .45rem }
.auth-on .w-btn{ margin-left:auto }
.badge-role{ font-size:.7rem; font-weight:800; padding:.1rem .45rem; border-radius:99px;
  background:var(--rose); color:#fff }
.auth-table{ font-size:.8rem; margin:.2rem 0 }
.auth-table td, .auth-table th{ padding:.35rem .5rem }
.auth-hash{ font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:.72rem;
  color:var(--ink-3); word-break:break-all }
.auth-row-me{ background:var(--mint-s) }
.auth-leak, .auth-okbox{ margin-top:.6rem; padding:.7rem .85rem; border-radius:11px;
  font-size:.87rem; line-height:1.6; border:1.5px solid }
.auth-leak{ background:var(--rose-s); border-color:var(--rose) }
.auth-okbox{ background:var(--mint-s); border-color:var(--mint) }
.auth-leak small, .auth-okbox small{ display:block; margin-top:.3rem; color:var(--ink-2) }

/* 20강 · 배포 실험실 위젯 */
.dep-group{ margin-bottom:.7rem }
.dep-label{ font-size:.78rem; font-weight:800; color:var(--ink-2); margin-bottom:.3rem }
.dep-seg{ display:flex; flex-wrap:wrap; gap:.35rem }
.dep-opt{ flex:1 1 auto; min-width:96px; font:inherit; font-size:.79rem; font-weight:700;
  padding:.45rem .5rem; border-radius:9px; cursor:pointer; text-align:center;
  background:var(--paper); color:var(--ink-2); border:1.5px solid var(--line) }
.dep-opt:hover{ border-color:var(--line-2) }
.dep-opt.on{ background:var(--blue); border-color:var(--blue); color:#fff }
.dep-verdict{ display:flex; flex-wrap:wrap; align-items:baseline; gap:.5rem;
  padding:.7rem .9rem; border-radius:11px; border:1.5px solid; font-size:.88rem }
.dep-verdict b{ font-size:.95rem }
.vd-ok{   background:var(--mint-s); border-color:var(--mint) }
.vd-warn{ background:var(--amber-s); border-color:var(--amber) }
.vd-bad{  background:var(--rose-s); border-color:var(--rose) }
.dep-chain{ display:flex; flex-wrap:wrap; align-items:center; gap:.3rem; margin:.8rem 0 }
.dep-hop{ background:var(--page); border:1.5px solid var(--line-2); border-radius:10px;
  padding:.4rem .55rem; font-size:.72rem; font-weight:700; text-align:center; line-height:1.3 }
.dep-hop b{ display:block; font-size:1.15rem; font-weight:400 }
.dep-hop.on{ background:var(--mint-s); border-color:var(--mint) }
.dep-hop.off{ opacity:.45; border-style:dashed }
.dep-arrow{ color:var(--ink-3); font-size:.9rem }
.dep-arrow.dep-x{ color:var(--rose); font-weight:900 }
.dep-warns{ list-style:none; margin:.6rem 0 0; padding:0; display:grid; gap:.35rem }
.dep-warns li{ font-size:.82rem; line-height:1.55; padding:.45rem .6rem; border-radius:9px;
  border-left:3px solid var(--line-2); background:var(--page) }
.dw-bad{  border-left-color:var(--rose);  background:var(--rose-s) }
.dw-warn{ border-left-color:var(--amber); background:var(--amber-s) }
.dw-tip{  border-left-color:var(--mint);  background:var(--mint-s) }
.dep-facts{ list-style:none; margin:.4rem 0; padding:0; display:grid; gap:.3rem }
.dep-facts li{ font-size:.81rem; color:var(--ink-2); padding:.35rem .55rem;
  background:var(--page); border-radius:8px }
.dep-facts li.off{ opacity:.5 }
.dep-facts b{ margin-right:.4rem; color:var(--ink) }
.dep-headers{ margin-top:.6rem; background:var(--code-bg); color:var(--code-ink);
  border-radius:11px; padding:.7rem .85rem; overflow-x:auto }
.dep-hh{ font-size:.78rem; font-weight:800; margin-bottom:.4rem; opacity:.85 }
.dep-headers .lg{ font-size:.74rem; line-height:1.7; white-space:nowrap }
.dep-headers .lg b{ color:var(--mint) }

/* 15강 · Jinja2 실습실 위젯 */
.jl-grid{ align-items:start }
.jl-presets{ display:flex; flex-wrap:wrap; gap:.3rem; margin-bottom:.5rem }
.jl-preset{ font:inherit; font-size:.75rem; font-weight:700; padding:.3rem .55rem; cursor:pointer;
  border-radius:8px; background:var(--paper); color:var(--ink-2); border:1.5px solid var(--line) }
.jl-preset:hover{ border-color:var(--line-2) }
.jl-preset.on{ background:var(--coral); border-color:var(--coral); color:#fff }
.jl-tpl{ min-height:220px; font-size:.8rem; line-height:1.65 }
.jl-ctx{ margin-top:.7rem }
.jl-ctx-h{ font-size:.78rem; font-weight:800; color:var(--ink-2); margin-bottom:.3rem }
.jl-ctxtable{ font-size:.75rem }
.jl-ctxtable td, .jl-ctxtable th{ padding:.25rem .45rem }
.jl-vars{ font-size:.76rem; color:var(--ink-3); margin-top:.4rem; line-height:1.7 }
.jl-vars code{ font-size:.9em }
.jl-tabs{ display:flex; gap:.25rem }
.jl-tab{ font:inherit; font-size:.75rem; font-weight:700; padding:.25rem .55rem; cursor:pointer;
  border-radius:7px; background:transparent; color:var(--ink-3); border:1.5px solid transparent }
.jl-tab.on{ background:var(--page); color:var(--ink); border-color:var(--line) }
.jl-out{ border:1.5px solid var(--line); border-radius:11px; overflow:hidden; background:var(--paper) }
.jl-frame{ width:100%; height:330px; border:0; display:block; background:#fff }
[data-bs-theme="dark"] .jl-frame{ background:#151b26 }
.jl-src{ background:var(--code-bg); color:var(--code-ink); border-radius:11px; margin:0;
  padding:.8rem .9rem; font-size:.76rem; line-height:1.65; max-height:330px; overflow:auto;
  white-space:pre-wrap; word-break:break-all }
.jl-stat{ font-size:.78rem; color:var(--ink-3); margin-top:.5rem }
.jl-err{ background:var(--rose-s); border:1.5px solid var(--rose); border-radius:10px;
  padding:.6rem .8rem; font-size:.82rem; line-height:1.6; margin-bottom:.6rem; word-break:break-word }
.jl-err b{ display:inline-block; background:var(--rose); color:#fff; border-radius:6px;
  padding:.05rem .4rem; font-size:.72rem; margin-right:.4rem }

/* 16강 · Bootstrap 반응형 실험실 위젯 */
.bs-grid{ align-items:start }
.dep-opt small{ display:block; font-size:.62rem; font-weight:600; opacity:.75 }
.dep-opt code{ font-size:.9em; background:none; padding:0 }
.bs-range{ width:100%; margin-top:.45rem; accent-color:var(--blue) }
.bs-cols{ display:grid; gap:.4rem }
.bs-cols label{ display:flex; align-items:center; gap:.4rem; font-size:.79rem; font-weight:700; color:var(--ink-2) }
.bs-cols code{ font-size:.85em; color:var(--ink-3) }
.bs-cols select{ margin-left:auto; font:inherit; font-size:.78rem; padding:.25rem .4rem;
  border-radius:8px; border:1.5px solid var(--line); background:var(--paper); color:var(--ink) }
.bs-badge{ font-size:.72rem; font-weight:800; padding:.2rem .5rem; border-radius:99px;
  background:var(--blue); color:#fff }
.bs-verdict{ font-size:.82rem; line-height:1.65; color:var(--ink-2); background:var(--page);
  border-left:3px solid var(--blue); border-radius:9px; padding:.5rem .7rem; margin-bottom:.6rem }
.bs-stage{ border:1.5px solid var(--line-2); border-radius:11px; background:var(--paper);
  overflow:hidden; position:relative }
.bs-frame{ height:360px; border:0; display:block; background:#fff;
  transform-origin:top left; transition:width .12s ease }
.bs-src{ max-height:240px; font-size:.73rem }

/* 14강 · 라우터 실험실 위젯 */
.fl-grid{ align-items:start }
.fl-methods .dep-opt{ min-width:64px }
.fl-m.on.fm-get{ background:var(--blue);  border-color:var(--blue) }
.fl-m.on.fm-post{ background:var(--mint);  border-color:var(--mint) }
.fl-m.on.fm-put{ background:var(--amber); border-color:var(--amber) }
.fl-m.on.fm-del{ background:var(--rose);  border-color:var(--rose) }
.fl-host{ font-size:.78rem; font-weight:700; color:var(--ink-3); white-space:nowrap; padding:.35rem 0 }
.fl-path{ font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:.82rem }
.fl-body{ margin-top:.6rem }
.fl-fields{ display:grid; grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); gap:.4rem; margin-top:.3rem }
.fl-fields label{ display:flex; align-items:center; gap:.35rem }
.fl-fields span{ font-size:.75rem; font-weight:700; color:var(--ink-3); min-width:38px }
.fl-routes{ font-size:.76rem }
.fl-routes td{ padding:.28rem .4rem; vertical-align:middle }
.fl-routes tr{ cursor:pointer }
.fl-routes tr:hover{ background:var(--page) }
.fl-routes code{ font-size:.92em }
.fl-kind{ color:var(--ink-3); font-size:.72rem }
.fl-ex{ display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:.3rem }
.fl-exb{ font:inherit; text-align:left; cursor:pointer; font-size:.75rem; line-height:1.4;
  padding:.35rem .5rem; border-radius:9px; background:var(--page);
  border:1.5px solid var(--line); color:var(--ink-2) }
.fl-exb:hover{ border-color:var(--line-2) }
.fl-exb b{ color:var(--ink); margin-right:.25rem }
.fl-exb small{ display:block; color:var(--ink-3); font-size:.68rem }
.fl-status{ display:flex; flex-wrap:wrap; align-items:center; gap:.5rem; font-size:.86rem }
.fl-code-badge{ font-weight:900; font-size:.8rem; padding:.2rem .55rem; border-radius:8px; color:#fff }
.s-ok{ background:var(--mint) } .s-warn{ background:var(--amber) } .s-bad{ background:var(--rose) }
.fl-req{ font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:.78rem; color:var(--ink-3) }
.fl-hit, .fl-miss{ margin-top:.5rem; padding:.55rem .7rem; border-radius:10px;
  font-size:.81rem; line-height:1.65; border:1.5px solid }
.fl-hit{ background:var(--mint-s); border-color:var(--mint) }
.fl-miss{ background:var(--rose-s); border-color:var(--rose) }
.fl-log{ max-height:120px }
.fl-out{ max-height:200px; font-size:.75rem }
.fl-code{ max-height:210px; font-size:.73rem }

/* 1~5강 · 기초 개념 위젯 */
.vl-eq{ font-weight:900; color:var(--ink-3); padding:0 .1rem }
.vl-shelf{ display:flex; flex-wrap:wrap; gap:.5rem; margin:.7rem 0; min-height:60px }
.vl-box{ background:var(--amber-s); border:1.5px solid var(--amber); border-radius:11px;
  padding:.45rem .6rem; min-width:96px; text-align:center }
.vl-box.hit{ animation:vlpop .5s ease }
.vl-shelf.sm .vl-box, .vl-box.sm{ min-width:76px; padding:.3rem .4rem }
.vl-tag{ font-size:.72rem; font-weight:800; color:var(--ink-2) }
.vl-val{ font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:.85rem; font-weight:700; margin-top:.15rem }
@keyframes vlpop{ 0%{ transform:scale(.8); background:var(--mint-s) } 100%{ transform:scale(1) } }
.vl-code{ max-height:160px }
.dl-cards{ display:grid; gap:.45rem }
.dl-card{ background:var(--mint-s); border:1.5px solid var(--mint); border-radius:11px; padding:.5rem .7rem }
.dl-h{ font-size:.76rem; font-weight:800; color:var(--ink-2); margin-bottom:.2rem }
.dl-row{ display:flex; justify-content:space-between; font-size:.82rem; padding:.08rem 0 }
.dl-lbl{ font-size:.78rem; font-weight:700; color:var(--ink-3); white-space:nowrap }
.dl-res{ margin-top:.5rem }
.dl-ok, .dl-err{ padding:.6rem .8rem; border-radius:10px; font-size:.84rem; line-height:1.65; border:1.5px solid }
.dl-ok{ background:var(--mint-s); border-color:var(--mint) }
.dl-err{ background:var(--rose-s); border-color:var(--rose) }
.dl-ok small, .dl-err small{ color:var(--ink-2) }
.rl-fields{ display:grid; gap:.35rem }
.rl-row{ display:flex; gap:.35rem }
.rl-row .w-inp:first-child{ max-width:110px }
.rl-cards{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:.5rem; margin-bottom:.5rem }
.rl-card .idcard-row.miss{ background:var(--rose-s); border-radius:6px }
.cl-op.on.p-c-b{ background:var(--mint); border-color:var(--mint) }
.cl-op.on.p-r-b{ background:var(--blue); border-color:var(--blue) }
.cl-op.on.p-u-b{ background:var(--amber); border-color:var(--amber) }
.cl-op.on.p-d-b{ background:var(--rose); border-color:var(--rose) }
.cl-args{ margin:.5rem 0 }
.cl-table{ font-size:.82rem }
.cl-langs{ display:grid; gap:.4rem }
.cl-lang{ background:var(--page); border:1px solid var(--line); border-radius:10px; padding:.4rem .6rem }
.cl-lang b{ font-size:.75rem; color:var(--ink-2) }
.cl-lang pre{ margin:.2rem 0 0; font-size:.75rem; line-height:1.55; white-space:pre-wrap; word-break:break-all }
.cl-note{ font-size:.82rem; line-height:1.6; color:var(--ink-2); background:var(--blue-s);
  border-radius:9px; padding:.45rem .65rem }
.tl-ctl{ flex-wrap:wrap; margin:.6rem 0 }
.tl-table{ font-size:.83rem }
.tl-table td.hl, .tl-table th.hl{ background:var(--amber-s); font-weight:800 }

/* 6·8·10·11·17강 위젯 */
.cb-drawers{ display:flex; flex-wrap:wrap; gap:.45rem; margin:.6rem 0 }
.cb-drawer{ font:inherit; cursor:pointer; text-align:left; padding:.45rem .7rem; border-radius:11px;
  background:var(--page); border:1.5px solid var(--line-2); color:var(--ink-2) }
.cb-drawer.on{ background:var(--blue-s); border-color:var(--blue); color:var(--ink) }
.cb-drawer b{ display:block; font-size:.84rem } .cb-drawer small{ font-size:.7rem; color:var(--ink-3) }
.cb-level{ font-size:.82rem; color:var(--ink-2); margin:.4rem 0; line-height:1.7 }
.cb-log{ max-height:110px; margin-top:.6rem }
.jn-two{ gap:.7rem } .jn-cap{ font-size:.8rem; font-weight:800; color:var(--ink-2); margin-bottom:.25rem }
.jn-verdict{ margin-top:.5rem; font-size:.83rem; line-height:1.65; background:var(--page);
  border-left:3px solid var(--blue); border-radius:9px; padding:.5rem .7rem }

/* 계정 · 랜딩 · 관리자 */
.nb-user{ font-size:.8rem; font-weight:700; color:var(--ink-2); padding:.2rem .55rem;
  background:var(--page); border:1px solid var(--line); border-radius:99px; white-space:nowrap }
.nb-user b{ color:var(--rose) }
.nb-user.guest{ color:var(--ink-3) }
.landing{ max-width:820px; margin:2rem auto; text-align:center; padding:0 1rem }
.landing-img{ width:100%; max-width:620px; border-radius:var(--radius); box-shadow:var(--shadow) }
.landing h1{ font-size:1.9rem; font-weight:900; margin:1.4rem 0 .5rem; letter-spacing:-.02em }
.landing-lead{ color:var(--ink-2); line-height:1.85; font-size:.97rem; margin-bottom:1.6rem }
.landing-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(255px,1fr)); gap:.9rem }
.lp-card{ display:block; text-align:left; text-decoration:none; color:inherit; padding:1.2rem 1.3rem;
  border-radius:var(--radius); border:2px solid var(--line); background:var(--paper); transition:.15s }
.lp-card:hover{ transform:translateY(-2px); box-shadow:var(--shadow) }
.lp-login{ border-color:var(--blue); background:var(--blue-s) }
.lp-guest{ border-color:var(--line-2) }
.lp-i{ font-size:2rem } .lp-card b{ display:block; font-size:1.05rem; margin:.3rem 0 .5rem }
.lp-card ul{ margin:0 0 .8rem; padding-left:1.1rem; font-size:.85rem; color:var(--ink-2); line-height:1.9 }
.lp-go{ font-weight:800; font-size:.87rem; color:var(--blue) }
.lp-guest .lp-go{ color:var(--ink-3) }
.landing-foot{ margin-top:1.4rem; font-size:.82rem; color:var(--ink-3) }
.login-box{ max-width:400px; margin:2.5rem auto; text-align:center }
.login-form{ display:grid; gap:.8rem; margin:1.2rem 0 .8rem; text-align:left }
.login-form label{ font-size:.82rem; font-weight:800; color:var(--ink-2); display:grid; gap:.25rem }
.login-alt{ font-size:.84rem } .login-alt a{ color:var(--ink-3) }
.locked-box{ max-width:520px; margin:2.5rem auto; text-align:center }
.lk-icon{ font-size:3rem } .lk-msg{ margin:1rem 0 1.4rem; line-height:1.9; color:var(--ink-2) }
.lk-btns{ display:flex; gap:.5rem; justify-content:center; flex-wrap:wrap }
.toc-item.locked, .cur-card.locked{ opacity:.55 }
.guest-note{ border-left:4px solid var(--amber) }
.guest-note p{ margin:.3rem 0 0; font-size:.87rem; color:var(--ink-2); line-height:1.75 }
.quiz-score{ margin-top:.7rem; font-size:.83rem; color:var(--ink-2); background:var(--page);
  border:1px solid var(--line); border-radius:99px; padding:.25rem .8rem; display:inline-block }
.ms-sum{ font-size:.95rem; margin-bottom:.7rem }
.ms-sum b{ font-size:1.15rem } .ms-pct{ color:var(--ink-3); margin-left:.4rem }
.ms-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(64px,1fr)); gap:.35rem }
.ms-cell{ text-align:center; text-decoration:none; color:var(--ink-3); background:var(--page);
  border:1.5px solid var(--line); border-radius:9px; padding:.35rem .1rem; font-size:.7rem }
.ms-cell b{ display:block; font-size:.82rem; color:var(--ink) }
.ms-cell.part{ background:var(--amber-s); border-color:var(--amber) }
.ms-cell.full{ background:var(--mint-s); border-color:var(--mint) }
.ad-head{ display:flex; flex-wrap:wrap; align-items:center; gap:.8rem; margin-bottom:1rem }
.ad-tabs{ display:flex; gap:.3rem; margin-left:auto }
.ad-tab{ font:inherit; font-size:.82rem; font-weight:700; padding:.35rem .8rem; cursor:pointer;
  border-radius:9px; background:var(--page); border:1.5px solid var(--line); color:var(--ink-2) }
.ad-tab.on{ background:var(--blue); border-color:var(--blue); color:#fff }
.ad-add, .ad-toolbar{ display:flex; flex-wrap:wrap; gap:.4rem; align-items:center; margin-bottom:.8rem }
.ad-table{ font-size:.83rem } .ad-table td{ vertical-align:middle }
.ad-in{ font-size:.8rem; padding:.25rem .45rem; max-width:130px }
.ad-num{ width:70px; font-size:.8rem; padding:.25rem .4rem }
.ad-dim{ color:var(--ink-3); font-size:.76rem }
.ad-actions{ display:flex; gap:.25rem; flex-wrap:wrap }
.ad-h{ margin-top:1.4rem }
.ad-matrix{ overflow-x:auto }
.ad-matrix-t{ font-size:.75rem; white-space:nowrap }
.ad-matrix-t td, .ad-matrix-t th{ padding:.2rem .35rem; text-align:center }
.ad-name{ font-weight:800; text-align:left!important }
.mx-full{ background:var(--mint-s); font-weight:800 }
.mx-part{ background:var(--amber-s) }
.mx-none{ color:var(--ink-3) }

/* ══════════════════════════════════════════════════════════
   컴퓨터 네트워크 첫걸음 — 추가 스타일
   ══════════════════════════════════════════════════════════ */

/* ── 셸 셀 배지 ─────────────────────────── */
.badge-server{background:var(--mint-s);color:var(--mint)}
.badge-client{background:var(--violet-s);color:var(--violet)}
.cell-sh.from-client{border-left:3px solid var(--violet)}
.cell-sh.from-server{border-left:3px solid var(--mint)}

/* ── 터미널 출력 ────────────────────────── */
.term{background:var(--code-bg);color:var(--code-ink);border-radius:10px;
  padding:.7rem .85rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.83rem;line-height:1.55;overflow-x:auto;white-space:pre-wrap;word-break:break-word}
.term-server{border-left:3px solid var(--mint)}
.term-client{border-left:3px solid var(--violet)}
.term-cmd{color:#fff;font-weight:600;margin-top:.5rem}
.term-cmd:first-child{margin-top:0}
.term-p{color:var(--mint);font-weight:700}
.term-client .term-p{color:#c4b5fd}
.term-out{color:#cbd5e1;margin:.15rem 0 .1rem}
.term-out.bad{color:#fca5a5}
.term-out b{color:#fde68a;font-weight:700}
.term-out code{background:rgba(255,255,255,.08);padding:0 .25em;border-radius:4px;color:#a5f3fc}
.term-code{color:#94a3b8;font-size:.75rem}

/* ── 내 가상 서버 상태 띠 ───────────────── */
.netbar{display:flex;flex-wrap:wrap;gap:.35rem .9rem;padding:.5rem .75rem;margin-bottom:.7rem;
  background:var(--page);border:1px solid var(--line);border-radius:10px;font-size:.78rem}
.nbi{display:flex;gap:.35rem;align-items:baseline;white-space:nowrap}
.nbi i{color:var(--ink-3);font-style:normal;font-size:.72rem}
.nbi b{color:var(--mint)}
.nb-off{color:var(--rose);font-weight:700}

/* ── 결과 한 줄 · 단계 목록 ─────────────── */
.pr{padding:.5rem .7rem;border-radius:9px;margin:.5rem 0;font-size:.86rem;
  display:flex;flex-wrap:wrap;gap:.5rem;align-items:baseline}
.pr b{font-size:1.05rem}
.pr em{flex:1 0 100%;font-style:normal;color:var(--ink-2);font-size:.8rem}
.pr-ok{background:var(--mint-s);color:var(--mint)}
.pr-warn{background:var(--amber-s);color:var(--amber)}
.pr-bad{background:var(--rose-s);color:var(--rose)}
.pr-up,.pr-ms{font-size:.75rem;opacity:.85}
.whys{margin:.5rem 0;padding-left:1.3rem;font-size:.82rem;color:var(--ink-2)}
.whys li{margin:.18rem 0}
.whys li b{color:var(--ink)}

/* ── 판정 박스 ──────────────────────────── */
.verdict{padding:.65rem .85rem;border-radius:10px;margin:.6rem 0;font-size:.88rem;line-height:1.6}
.v-ok{background:var(--mint-s);color:var(--mint);border:1px solid color-mix(in srgb,var(--mint) 30%,transparent)}
.v-no{background:var(--rose-s);color:var(--rose);border:1px solid color-mix(in srgb,var(--rose) 30%,transparent)}
.v-warn{background:var(--amber-s);color:var(--amber);border:1px solid color-mix(in srgb,var(--amber) 30%,transparent)}
.fr-note{font-size:.8rem;color:var(--ink-2);background:var(--page);border-radius:9px;
  padding:.5rem .7rem;margin-top:.55rem;line-height:1.6}

/* ── 태그 ───────────────────────────────── */
.tag{display:inline-block;padding:.1rem .45rem;border-radius:6px;font-size:.72rem;font-weight:700}
.tag-public{background:var(--mint-s);color:var(--mint)}
.tag-private{background:var(--blue-s);color:var(--blue)}
.tag-loop{background:var(--violet-s);color:var(--violet)}
.tag-cgnat,.tag-bad{background:var(--rose-s);color:var(--rose)}
.tag-multi{background:var(--amber-s);color:var(--amber)}
b.yes,td.yes,.yes{color:var(--mint)}
b.no,td.no,.no{color:var(--rose)}
td.mid,.mid{color:var(--amber)}

/* ── 1강 프레임 ─────────────────────────── */
.frame{display:flex;flex-wrap:wrap;gap:2px;margin:.6rem 0}
.fr{flex:1 1 auto;min-width:88px;padding:.4rem .5rem;border-radius:7px;font-size:.72rem;
  font-weight:700;text-align:center;color:var(--ink)}
.fr small{display:block;font-weight:400;font-size:.66rem;opacity:.8;word-break:break-all}
.fr-pre{background:var(--line)}
.fr-dst{background:var(--rose-s)}
.fr-src{background:var(--mint-s)}
.fr-typ{background:var(--amber-s)}
.fr-pay{background:var(--blue-s);flex:2 1 140px}
.fr-fcs{background:var(--violet-s)}
.wave{display:flex;gap:1px;height:34px;align-items:flex-end;margin:.5rem 0;overflow-x:auto}
.wv{flex:0 0 5px;background:var(--blue);border-radius:1px}
.wv.hi{height:100%}
.wv.lo{height:22%;background:var(--line-2)}

/* ── 2강 계층 스택 ──────────────────────── */
.layer-stack{display:flex;flex-direction:column;gap:3px;margin:.7rem 0}
.ly{padding:.5rem .7rem;border-radius:9px;font-size:.82rem;display:flex;flex-wrap:wrap;gap:.4rem .7rem;align-items:baseline}
.ly b{min-width:80px}
.ly span{color:var(--ink-2);font-family:ui-monospace,monospace;font-size:.76rem}
.ly em{flex:1 0 100%;font-style:normal;font-size:.72rem;color:var(--ink-3)}
.ly-app{background:var(--blue-s)}
.ly-tcp{background:var(--mint-s)}
.ly-ip{background:var(--amber-s)}
.ly-eth{background:var(--violet-s)}
.pkt-row{display:flex;flex-wrap:wrap;gap:3px;align-items:center;margin:.6rem 0}
.pkt{width:14px;height:18px;background:var(--blue);border-radius:2px;opacity:.75}

/* ── 3강 IP 비트 ────────────────────────── */
.ipbits{display:flex;gap:.4rem;flex-wrap:wrap;margin:.6rem 0}
.ipb{flex:1 1 90px;background:var(--page);border:1px solid var(--line);border-radius:9px;padding:.4rem;text-align:center}
.ipb-d{font-size:1.1rem;font-weight:700}
.ipb-b{font-family:ui-monospace,monospace;font-size:.72rem;color:var(--ink-3);letter-spacing:.5px}
.ip-presets{gap:.3rem!important}
.ip-split{text-align:center;margin:.9rem 0;font-family:ui-monospace,monospace;font-size:1.5rem}
.ip-net{background:var(--blue-s);color:var(--blue);padding:.1em .2em;border-radius:5px}
.ip-host{background:var(--amber-s);color:var(--amber);padding:.1em .2em;border-radius:5px}
.ip-legend{font-family:inherit;font-size:.78rem;margin-top:.4rem;color:var(--ink-2)}
.l-net{color:var(--blue)} .l-host{color:var(--amber)}

/* ── 4강 이진 비교 ──────────────────────── */
.bincmp{margin:.6rem 0;font-family:ui-monospace,monospace;font-size:.78rem}
.bincmp>div{display:flex;gap:.6rem;align-items:baseline;padding:.15rem 0}
.bincmp i{font-style:normal;font-family:inherit;min-width:60px;color:var(--ink-3);font-size:.74rem}
.bincmp code{letter-spacing:.5px}
.mk-net{background:var(--blue-s);color:var(--blue)}
.mk-host{background:var(--amber-s);color:var(--amber)}

/* ── 5강 라우팅 표 ──────────────────────── */
.rt-table{background:var(--code-bg);color:var(--code-ink);padding:.6rem .8rem;border-radius:9px;
  font-size:.8rem;margin:.5rem 0;overflow-x:auto}

/* ── 6강 TCP 흐름 ───────────────────────── */
.tcpflow{margin:.6rem 0;font-family:ui-monospace,monospace;font-size:.78rem;
  max-height:280px;overflow-y:auto;border:1px solid var(--line);border-radius:9px;padding:.5rem}
.tf{padding:.15rem .35rem;border-radius:5px}
.tf-hs{color:var(--violet);font-weight:700}
.tf-ok{color:var(--mint)}
.tf-re{color:var(--amber);background:var(--amber-s)}
.tf-lost{color:var(--rose);background:var(--rose-s)}
.hs-flow{margin:.8rem 0;display:flex;flex-direction:column;gap:.35rem}
.hs-row{display:grid;grid-template-columns:60px 1fr 60px;gap:.5rem;align-items:center;
  padding:.4rem .6rem;background:var(--page);border-radius:9px;font-size:.82rem}
.hs-row em{grid-column:1/-1;font-style:normal;font-size:.76rem;color:var(--ink-2)}
.hs-a,.hs-b{font-weight:700;font-size:.76rem;color:var(--ink-2)}
.hs-b{text-align:right}
.hs-arrow{text-align:center;font-family:ui-monospace,monospace;color:var(--blue);font-weight:700}
.hs-ok{background:var(--mint-s)}

/* ── 7강 포트 건물 ──────────────────────── */
.port-building{margin:.9rem 0;border:2px solid var(--line-2);border-radius:12px;overflow:hidden}
.pb-addr{background:var(--ink);color:var(--paper);padding:.5rem .8rem;font-weight:700;font-size:.9rem}
.pb-addr small{opacity:.7;font-weight:400}
.pb-floor{display:flex;gap:.8rem;align-items:center;padding:.45rem .8rem;border-top:1px solid var(--line);font-size:.85rem}
.pb-no{flex:0 0 52px;text-align:center;font-family:ui-monospace,monospace;font-weight:700;
  background:var(--blue-s);color:var(--blue);border-radius:6px;padding:.15rem}
.quad{text-align:center;font-family:ui-monospace,monospace;background:var(--page);
  padding:.6rem;border-radius:9px;margin:.6rem 0;font-size:.85rem}

/* ── 8강 DNS 계단 ───────────────────────── */
.dns-steps{margin:.8rem 0;display:flex;flex-direction:column;gap:.3rem}
.ds{padding:.45rem .7rem;background:var(--page);border-radius:9px;font-size:.84rem;border-left:3px solid var(--line-2)}
.ds b{display:inline-block;min-width:1.4em;color:var(--blue)}
.ds em{color:var(--ink-2)}
.ds-ok{background:var(--mint-s);border-left-color:var(--mint)}

/* ── 9강 HTTP 메시지 ────────────────────── */
.http-msg{background:var(--code-bg);color:var(--code-ink);border-radius:10px;padding:.6rem .8rem;
  font-family:ui-monospace,monospace;font-size:.78rem;margin:.5rem 0;overflow-x:auto}
.hm-line{white-space:pre-wrap;word-break:break-all;padding:.05rem 0}
.hm-start{color:#7dd3fc;font-weight:700}
.hm-blank{color:#64748b}
.hm-body{color:#a7f3d0}
.hm-hi{background:rgba(251,191,36,.15);border-radius:4px}
.http-res .hm-start{color:#86efac}
.status-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.5rem;margin:.8rem 0}
.sg{padding:.6rem .7rem;border-radius:10px;font-size:.8rem;line-height:1.7}
.sg b{font-size:1rem}
.sg-2{background:var(--mint-s);color:var(--mint)}
.sg-3{background:var(--blue-s);color:var(--blue)}
.sg-4{background:var(--amber-s);color:var(--amber)}
.sg-5{background:var(--rose-s);color:var(--rose)}

/* ── 10강 YAML ──────────────────────────── */
.yaml-anno pre,.yamlbox{background:var(--code-bg);color:var(--code-ink);border-radius:10px;
  padding:.7rem .9rem;font-size:.8rem;overflow-x:auto;margin:.5rem 0;line-height:1.6}
.yaml-anno .an{color:#fbbf24}
.cmd-pre,.err-pre{background:var(--code-bg);color:var(--code-ink);border-radius:10px;
  padding:.7rem .9rem;font-size:.82rem;overflow-x:auto;margin:.6rem 0;
  font-family:ui-monospace,monospace;line-height:1.65}
.err-pre{color:#fca5a5}
.np-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.np-grid label{display:flex;flex-direction:column;gap:.25rem;font-size:.78rem;color:var(--ink-2)}

/* ── 11강 방화벽 ────────────────────────── */
.fw-state{padding:.45rem .7rem;border-radius:9px;font-weight:700;font-size:.85rem;margin-bottom:.5rem}
.fw-state.on{background:var(--mint-s);color:var(--mint)}
.fw-state.off{background:var(--rose-s);color:var(--rose)}

/* ── 12·14강 프록시 흐름 ────────────────── */
.proxy-flow{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;justify-content:center;margin:.8rem 0}
.pf{padding:.5rem .8rem;border-radius:10px;background:var(--page);border:1px solid var(--line);text-align:center;font-size:.82rem}
.pf small{display:block;font-size:.7rem;color:var(--ink-3);font-family:ui-monospace,monospace}
.pf-ng{background:var(--mint-s);border-color:var(--mint)}
.pf-app{background:var(--blue-s);border-color:var(--blue)}
.pf.dead{background:var(--rose-s);border-color:var(--rose);opacity:.75;text-decoration:line-through}
.pf-a{font-family:ui-monospace,monospace;font-size:.74rem;color:var(--ink-3)}

/* ── 15강 로드밸런싱 막대 ───────────────── */
.lbbars{display:flex;flex-direction:column;gap:.35rem;margin:.6rem 0}
.lbb{display:grid;grid-template-columns:70px 1fr 40px;gap:.5rem;align-items:center;font-size:.8rem}
.lbb i{font-style:normal;color:var(--ink-2)}
.lbb-t{height:16px;background:var(--page);border-radius:8px;overflow:hidden}
.lbb-t span{display:block;height:100%;background:var(--blue);border-radius:8px;transition:width .4s}
.lbb-fail .lbb-t span{background:var(--rose)}
.lbb b{text-align:right}

/* ── 16강 배포 조합 ─────────────────────── */
.dep-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.6rem;margin:.6rem 0}
.dep-col{background:var(--page);border:1px solid var(--line);border-radius:10px;padding:.6rem .7rem;font-size:.8rem}
.dep-col b{display:block;margin-bottom:.35rem}
.dep-col label{display:flex;gap:.35rem;align-items:center;padding:.12rem 0;cursor:pointer}
.dep-col .w-inp{margin-top:.3rem;font-size:.78rem}
.nat-flow{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center;justify-content:center;margin:.8rem 0;font-size:.8rem}
.nf{padding:.35rem .6rem;background:var(--page);border-radius:8px;font-family:ui-monospace,monospace}
.nf-pub{background:var(--mint-s);color:var(--mint);font-weight:700}
.nf-a{color:var(--ink-3)}
.cdn-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.5rem;margin:.8rem 0}
.cg{background:var(--page);border:1px solid var(--line);border-radius:10px;padding:.6rem;text-align:center;font-size:.82rem}
.cg small{display:block;color:var(--ink-3);font-size:.72rem;margin:.15rem 0 .35rem}
.cg span{display:block;font-size:.74rem;font-weight:700;border-radius:6px;padding:.15rem}
.cg-y{background:var(--mint-s);color:var(--mint)}
.cg-m{background:var(--amber-s);color:var(--amber)}
.cg-n{background:var(--rose-s);color:var(--rose)}

/* ── 17강 지표 타일 ─────────────────────── */
.mtiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:.5rem;margin:.6rem 0}
.mtile{background:var(--page);border:1px solid var(--line);border-radius:10px;padding:.55rem .65rem}
.mtile i{font-style:normal;font-size:.72rem;color:var(--ink-3);display:block}
.mtile b{font-size:1.35rem;line-height:1.2}
.mtile span{font-size:.75rem;color:var(--ink-2)}
.mtile em{display:block;font-style:normal;font-size:.68rem;color:var(--ink-3);margin-top:.15rem}
.mtile.t-warn{background:var(--amber-s);border-color:var(--amber)}
.mtile.t-warn b{color:var(--amber)}
.mtile.t-bad{background:var(--rose-s);border-color:var(--rose)}
.mtile.t-bad b{color:var(--rose)}

/* ── 18강 진단 사다리 ───────────────────── */
.triage-ladder{display:flex;flex-direction:column;gap:.3rem;margin:.8rem 0}
.tl{display:grid;grid-template-columns:28px 1fr;gap:.5rem;align-items:baseline;
  padding:.45rem .7rem;background:var(--page);border-radius:9px;font-size:.84rem}
.tl b{grid-column:2}
.tl code{grid-column:2;font-size:.78rem;color:var(--blue)}
.tl-n{grid-row:1/3;display:flex;align-items:center;justify-content:center;
  background:var(--blue);color:#fff;border-radius:50%;width:24px;height:24px;font-size:.75rem;font-weight:700}
.tri-table td:first-child{font-weight:600}
.diag-row,.guess-row{gap:.3rem!important;flex-wrap:wrap}

/* ── 19강 로그 ──────────────────────────── */
.logbox{background:var(--code-bg);border-radius:10px;padding:.7rem .85rem;font-size:.75rem;
  overflow-x:auto;margin:.5rem 0;line-height:1.7}
.lg-ok{color:#86efac} .lg-bot{color:#93c5fd} .lg-bad{color:#fca5a5}
.burst{display:flex;flex-wrap:wrap;gap:.25rem;margin:.6rem 0}
.bq{padding:.2rem .45rem;border-radius:6px;font-size:.74rem;font-weight:700;font-family:ui-monospace,monospace}
.bq.ok{background:var(--mint-s);color:var(--mint)}
.bq.bad{background:var(--rose-s);color:var(--rose)}

/* ── 20강 성능 ──────────────────────────── */
.perf-toggles{gap:.8rem!important;flex-wrap:wrap}
.perf-toggles label{display:flex;gap:.3rem;align-items:center;font-size:.82rem;cursor:pointer}
.timeline{display:flex;gap:2px;margin:.8rem 0;flex-wrap:wrap}
.tm{flex:1 1 90px;padding:.5rem;border-radius:9px;text-align:center;font-size:.78rem}
.tm span{display:block;font-size:.7rem;color:var(--ink-2);margin-top:.2rem}
.tm-dns{background:var(--violet-s)} .tm-tcp{background:var(--blue-s)}
.tm-tls{background:var(--amber-s)}  .tm-ttfb{background:var(--coral-s)}
.tm-dl{background:var(--mint-s)}
.rttbars{display:flex;gap:3px;align-items:flex-end;height:60px;margin:.6rem 0}
.rttbars span{flex:1;background:var(--blue);border-radius:3px 3px 0 0;min-height:3px}
.grad-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.5rem;margin:.9rem 0}
.gg{background:var(--page);border:1px solid var(--line);border-radius:10px;padding:.6rem .7rem;font-size:.84rem}
.gg small{display:block;color:var(--ink-3);font-size:.72rem;margin-top:.15rem}

/* ── 공통 흐름 박스 · 2단 비교 ──────────── */
.flow-box{margin:.8rem 0;display:flex;flex-direction:column;gap:.3rem}
.fb-step{padding:.5rem .75rem;background:var(--page);border-radius:9px;font-size:.85rem;border-left:3px solid var(--line-2)}
.fb-step b{color:var(--blue);margin-right:.35rem}
.fb-arrow{text-align:center;color:var(--ink-3);font-size:.8rem}
.fb-ok{background:var(--mint-s);border-left-color:var(--mint)}
.fb-warn{background:var(--amber-s);border-left-color:var(--amber)}
.two-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:.6rem;margin:.6rem 0}
.tc{background:var(--page);border:1px solid var(--line);border-radius:10px;padding:.6rem .7rem}
.tc>b{display:block;font-size:.8rem;margin-bottom:.35rem}

/* ── 20강 경로 추적 ─────────────────────── */
.hops{display:flex;flex-direction:column;gap:.2rem;margin:.6rem 0}
.hop{display:grid;grid-template-columns:36px 1fr;gap:.5rem;align-items:center;
  padding:.45rem .6rem;background:var(--page);border-radius:10px;position:relative}
.hop.off{opacity:.45}
.hop.on{background:var(--mint-s)}
.hop-i{font-size:1.3rem;text-align:center}
.hop-b b{display:block;font-size:.85rem}
.hop-b small{color:var(--ink-2);font-size:.74rem;word-break:break-all}
.hop-a{grid-column:1;text-align:center;color:var(--ink-3);font-size:.8rem}

@media (max-width:640px){
  .netbar{font-size:.72rem;gap:.25rem .6rem}
  .hs-row{grid-template-columns:48px 1fr 48px;font-size:.76rem}
  .term{font-size:.76rem}
}

/* ── 허브(drson.iotok.org)로 돌아가는 홈 버튼 ── */
.nb-home{
  flex:0 0 auto; font-weight:700; line-height:1.4;
  border-radius:10px; padding:.28rem .55rem; white-space:nowrap;
}
@media (max-width:575.98px){ .nb-home{ padding:.28rem .45rem } }


/* 언어 토글 — 오른쪽 위. 지금 누르면 갈 언어를 배지로 보여 준다.
   좁은 화면에서는 지구본만 남긴다. */
.nb-lang{ display:inline-flex; align-items:center; gap:.25rem; font-weight:700; text-decoration:none }
.nb-lang b{ font-weight:800; font-size:.82rem; letter-spacing:.02em }
@media (max-width:520px){ .nb-lang b{ display:none } }

/* 영어로 보는데 그 강의 본문이 아직 한국어일 때 띄우는 한 줄 */
.nb-koronly{
  margin:0 0 1rem; padding:.55rem .85rem; border-radius:.5rem;
  border:1px solid var(--bs-warning-border-subtle,#ffe69c);
  background:var(--bs-warning-bg-subtle,#fff3cd);
  color:var(--bs-warning-text-emphasis,#664d03);
  font-size:.88rem;
}


/* ── 레슨 머리 — 눈높이 토글을 오른쪽에 앉힌다 ── */
.lh-top{ display:flex; align-items:center; justify-content:space-between;
  gap:.6rem; flex-wrap:wrap; margin-bottom:.65rem }
.lh-top .lh-no{ margin-bottom:0 }

/* ── 눈높이 토글 · 고등학생 풀이 ───────────
   강마다 오른쪽 위의 토글이 <html data-level> 을 바꾼다.
   기본은 'uni' — 그때 .cell-hs 는 아예 그려지지 않는다.
   ────────────────────────────────────────── */
.lvl-toggle{ display:inline-flex; background:var(--page); border:1px solid var(--line-2);
  border-radius:99px; padding:3px; gap:2px; flex:0 0 auto }
.lvl-btn{ border:0; background:transparent; color:var(--ink-3); font-weight:800;
  font-size:.78rem; letter-spacing:-.01em; padding:.26rem .82rem; border-radius:99px;
  white-space:nowrap; line-height:1.5; transition:background .18s, color .18s }
.lvl-btn:hover{ color:var(--ink-2) }
html[data-level="hs"]  .lvl-btn[data-level="hs"],
html[data-level="uni"] .lvl-btn[data-level="uni"]{
  background:var(--paper); color:var(--ink); box-shadow:0 1px 2px rgba(15,23,42,.12) }
html[data-level="hs"] .lvl-btn[data-level="hs"]{ color:var(--coral) }
[data-bs-theme="dark"] .lvl-btn[data-level]{ box-shadow:none }
html[data-bs-theme="dark"][data-level="hs"] .lvl-btn[data-level="hs"]{ color:#fdba74 }

html[data-level="uni"] .cell-hs{ display:none }
.cell-hs{ border:1px solid var(--coral); border-left-width:5px; border-radius:13px;
  background:var(--coral-s); padding:1.05rem 1.2rem }
.hs-h{ font-weight:800; font-size:.99rem; margin-bottom:.55rem;
  display:flex; align-items:center; gap:.5rem; flex-wrap:wrap }
.hs-badge{ background:var(--coral); color:#fff; font-size:.68rem; font-weight:900;
  padding:.14rem .5rem; border-radius:6px; letter-spacing:.02em; white-space:nowrap }
.hs-b{ font-size:.95rem; color:var(--ink-2) }
.hs-b p{ margin-bottom:.7rem } .hs-b p:last-child{ margin-bottom:0 }
.hs-b ul,.hs-b ol{ margin:.4rem 0 .7rem; padding-left:1.25rem }
.hs-b li{ margin-bottom:.35rem }
.hs-b b{ color:var(--ink) }
.hs-q{ font-weight:800; color:var(--ink); margin:.9rem 0 .35rem }
.hs-eq{ background:var(--paper); border:1px dashed var(--coral); border-radius:10px;
  padding:.7rem .9rem; margin:.7rem 0; font-weight:700; color:var(--ink); text-align:center }
.hs-b table{ width:100%; border-collapse:collapse; margin:.7rem 0; font-size:.88rem }
.hs-b th,.hs-b td{ border:1px solid var(--line); padding:.42rem .6rem; text-align:left }
.hs-b th{ background:var(--paper); font-weight:800; color:var(--ink) }
[data-bs-theme="dark"] .hs-eq,[data-bs-theme="dark"] .hs-b th{ background:rgba(255,255,255,.04) }