/* ============================================================
 * 「하드웨어 제품기획서 검토」 실습 플랫폼 공통 스타일
 * 콘셉트: 엔지니어링 검토 문서 — 제도용지 격자, 결재란, 도면 모서리 표식
 * ============================================================ */
:root {
  /* 메인: 딥 네이비 · 서브: 소프트 블루 · 포인트: 그레이/화이트 */
  --paper: #f3f5f9; --paper-2: #e6ebf3; --paper-3: #ffffff; --line: #d6dce7; --line-2: #b9c3d4;
  --ink: #13213f; --ink-2: #33456b; --muted: #687387; --accent: #5b86c5; --accent-soft: #e3ebf7; --on-accent: #ffffff;
  --navy: #13213f; --on-navy: #ffffff;
  --teal: #237a6a; --teal-soft: #dcefe9; --warn: #55698f; --warn-soft: #e5eaf3; --bad: #b23a3a; --bad-soft: #f7e0de;
  --grid: rgba(19, 33, 63, .05); --shadow: 0 1px 0 rgba(19,33,63,.06), 0 6px 18px -10px rgba(19,33,63,.32);
  --mono: 'IBM Plex Mono', ui-monospace, monospace; --sans: 'IBM Plex Sans KR', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0d1526; --paper-2: #152038; --paper-3: #1a2743; --line: #28375a; --line-2: #3a4b73;
    --ink: #e8edf6; --ink-2: #b6c2d9; --muted: #8692aa; --accent: #8fb2e6; --accent-soft: #1d2d4f; --on-accent: #0d1526;
    --navy: #2a3f6e; --on-navy: #ffffff;
    --teal: #57bfa9; --teal-soft: #173530; --warn: #a3b4d4; --warn-soft: #1f2b45; --bad: #e57373; --bad-soft: #3b2224;
    --grid: rgba(232, 237, 246, .04); --shadow: 0 1px 0 rgba(0,0,0,.3), 0 8px 22px -12px rgba(0,0,0,.7); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0d1526; --paper-2: #152038; --paper-3: #1a2743; --line: #28375a; --line-2: #3a4b73;
  --ink: #e8edf6; --ink-2: #b6c2d9; --muted: #8692aa; --accent: #8fb2e6; --accent-soft: #1d2d4f; --on-accent: #0d1526;
  --navy: #2a3f6e; --on-navy: #ffffff;
  --teal: #57bfa9; --teal-soft: #173530; --warn: #a3b4d4; --warn-soft: #1f2b45; --bad: #e57373; --bad-soft: #3b2224;
  --grid: rgba(232, 237, 246, .04); --shadow: 0 1px 0 rgba(0,0,0,.3), 0 8px 22px -12px rgba(0,0,0,.7); color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--sans); color: var(--ink); background-color: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px; line-height: 1.55; font-size: 15px; overflow-x: hidden;
}
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
a { color: var(--accent); }
button { font-family: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- 상단바 ---------- */
.topbar { position: sticky; top: 0; z-index: 40; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line); }
.topbar-inner { max-width: 1280px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { width: 34px; height: 34px; flex: none; border: 2px solid var(--ink); border-radius: 6px; display: grid; place-items: center;
  font-family: var(--mono); font-weight: 700; font-size: 11px; position: relative; background: var(--paper-3); }
.brand-mark::before, .brand-mark::after { content: ''; position: absolute; left: 6px; right: 6px; height: 4px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 5px); }
.brand-mark::before { top: -6px; } .brand-mark::after { bottom: -6px; }
.brand-title { font-weight: 700; font-size: 15px; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brand-sub { font-size: 11.5px; color: var(--muted); font-family: var(--mono); }
.spacer { flex: 1; }
.savestate { font-family: var(--mono); font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line-2); display: inline-block; flex: none; }
.dot.ok { background: var(--teal); } .dot.busy { background: var(--warn); animation: pulse 1s infinite; } .dot.err { background: var(--bad); }
@keyframes pulse { 50% { opacity: .3; } }

/* ---------- 버튼 · 입력 ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1.5px solid var(--ink); background: var(--paper-3);
  color: var(--ink); border-radius: 6px; padding: 7px 13px; font-size: 14px; font-weight: 600; cursor: pointer; line-height: 1.2;
  transition: transform .08s, background .15s; white-space: nowrap; text-decoration: none; }
.btn:hover { background: var(--paper-2); } .btn:active { transform: translateY(1px); }
.btn-primary { background: var(--navy); border-color: var(--navy); color: var(--on-navy); } .btn-primary:hover { background: var(--ink-2); }
.btn-accent { background: var(--accent); border-color: var(--accent); color: var(--on-accent); } .btn-accent:hover { filter: brightness(1.05); background: var(--accent); }
.btn-ghost { border-color: transparent; background: transparent; } .btn-ghost:hover { background: var(--paper-2); }
.btn-sm { padding: 4px 9px; font-size: 12.5px; } .btn[disabled] { opacity: .45; cursor: not-allowed; }
.icon-btn { position: relative; width: 38px; height: 38px; border-radius: 8px; border: 1.5px solid var(--line-2); background: var(--paper-3); cursor: pointer; display: grid; place-items: center; color: var(--ink); }
.icon-btn .badge-n { position: absolute; top: -6px; right: -6px; background: var(--accent); color: var(--on-accent); font-size: 11px; font-weight: 700; border-radius: 10px; padding: 1px 6px; font-family: var(--mono); }
input[type=text], input[type=number], input[type=password], input[type=date], input[type=url], select, textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--paper-3); border: 1.5px solid var(--line-2); border-radius: 6px; padding: 7px 10px; }
textarea { resize: vertical; min-height: 64px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px var(--accent-soft); }
label.lbl { display: block; font-size: 12.5px; font-weight: 600; color: var(--ink-2); margin: 0 0 4px; }
.check { display: flex; gap: 8px; align-items: flex-start; padding: 6px 8px; border-radius: 6px; cursor: pointer; }
.check:hover { background: var(--paper-2); }
.check input { margin-top: 3px; accent-color: var(--accent); width: 16px; height: 16px; flex: none; }

/* 세그먼트(라디오 버튼 묶음) */
.seg { display: inline-flex; border: 1.5px solid var(--line-2); border-radius: 7px; overflow: hidden; background: var(--paper-3); flex-wrap: nowrap; }
.seg button { white-space: nowrap; border: 0; background: transparent; padding: 5px 11px; font-size: 13px; font-weight: 600; color: var(--ink-2); cursor: pointer; border-right: 1px solid var(--line); }
.seg button:last-child { border-right: 0; }
.seg button.on { background: var(--navy); color: var(--on-navy); }
.seg.lv button.on[data-v="상"] { background: var(--teal); } .seg.lv button.on[data-v="중"] { background: var(--warn); } .seg.lv button.on[data-v="하"] { background: var(--bad); }

/* ---------- 레이아웃 ---------- */
.shell { max-width: 1280px; margin: 0 auto; padding: 18px 16px 80px; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 22px; }
@media (max-width: 900px) { .shell { grid-template-columns: minmax(0, 1fr); } }

/* 단계 내비 */
.stepnav { position: sticky; top: 74px; align-self: start; display: flex; flex-direction: column; gap: 8px; }
.stepnav .step { display: grid; grid-template-columns: 46px 1fr; gap: 10px; align-items: center; padding: 10px; border: 1.5px solid var(--line);
  border-radius: 8px; background: var(--paper-3); cursor: pointer; text-align: left; color: var(--ink); width: 100%; }
.stepnav .step:hover { border-color: var(--line-2); }
.stepnav .step.on { border-color: var(--ink); box-shadow: var(--shadow); }
.stepnav .step .n { font-family: var(--mono); font-size: 10.5px; color: var(--muted); }
.stepnav .step .t { font-weight: 700; font-size: 14px; line-height: 1.25; }
.ring { width: 46px; height: 46px; }
.ring circle { fill: none; stroke-width: 5; }
.ring .bg { stroke: var(--paper-2); } .ring .fg { stroke: var(--accent); stroke-linecap: round; transition: stroke-dashoffset .4s; transform: rotate(-90deg); transform-origin: 50% 50%; }
.ring.done .fg { stroke: var(--teal); }
.ring text { font-family: var(--mono); font-size: 11px; font-weight: 700; fill: var(--ink); }
.status { display: inline-block; font-size: 11px; font-weight: 700; padding: 1px 7px; border-radius: 10px; font-family: var(--mono); letter-spacing: .02em; }
.status.none { background: var(--paper-2); color: var(--muted); }
.status.draft { background: var(--warn-soft); color: var(--warn); }
.status.submitted { background: var(--teal-soft); color: var(--teal); }
.status.returned { background: var(--bad-soft); color: var(--bad); }
@media (max-width: 900px) {
  .stepnav { position: static; flex-direction: row; overflow-x: auto; padding-bottom: 4px; }
  .stepnav .step { min-width: 190px; }
  .stepnav .extra { display: none; }
}

/* ---------- 단계 머리 ---------- */
.stephead { padding: 20px 22px; border: 2px solid var(--ink); border-radius: 10px; background: var(--paper-3); position: relative; margin-bottom: 18px; }
.stephead .unit { font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 700; letter-spacing: .06em; }
.stephead h1 { margin: 2px 0 6px; font-size: clamp(22px, 3vw, 30px); line-height: 1.2; letter-spacing: -.01em; }
.stephead p { margin: 0; color: var(--ink-2); }
.stephead .acts { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; align-items: center; }

/* ---------- 카드(도면 모서리 표식) ---------- */
.card { position: relative; background: var(--paper-3); border: 1.5px solid var(--line-2); border-radius: 8px; padding: 18px; margin-bottom: 16px; box-shadow: var(--shadow); }
.card::before, .card::after { content: ''; position: absolute; width: 12px; height: 12px; border-color: var(--accent); border-style: solid; pointer-events: none; }
.card::before { top: -1.5px; left: -1.5px; border-width: 3px 0 0 3px; border-top-left-radius: 8px; }
.card::after { bottom: -1.5px; right: -1.5px; border-width: 0 3px 3px 0; border-bottom-right-radius: 8px; }
.sec-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.sec-no { font-family: var(--mono); font-weight: 700; font-size: 12px; background: var(--navy); color: var(--on-navy); border-radius: 4px; padding: 3px 7px; flex: none; margin-top: 2px; }
.sec-head h2 { margin: 0; font-size: 18px; line-height: 1.3; }
.sec-head .desc { font-size: 13.5px; color: var(--muted); margin-top: 2px; }
.ref { font-family: var(--mono); font-size: 11px; color: var(--muted); border: 1px dashed var(--line-2); border-radius: 4px; padding: 1px 6px; white-space: nowrap; }
.sec-head .right { margin-left: auto; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.hint { font-size: 13px; color: var(--ink-2); background: var(--paper-2); border-left: 3px solid var(--accent); padding: 8px 12px; border-radius: 0 6px 6px 0; margin: 10px 0; }
.ok-box { background: var(--teal-soft); color: var(--teal); border-left-color: var(--teal); }
.warn-box { background: var(--warn-soft); color: var(--warn); border-left-color: var(--warn); }
.bad-box { background: var(--bad-soft); color: var(--bad); border-left-color: var(--bad); }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 14px; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 12px; }

/* ---------- 표 ---------- */
.tbl-wrap { overflow-x: auto; border: 1.5px solid var(--line-2); border-radius: 6px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 560px; }
.tbl th, .tbl td { border-bottom: 1px solid var(--line); padding: 7px 9px; text-align: left; vertical-align: top; }
.tbl thead th { background: var(--paper-2); font-size: 12px; color: var(--ink-2); position: sticky; top: 0; }
.tbl tbody th { font-weight: 600; white-space: nowrap; background: color-mix(in srgb, var(--paper-2) 50%, transparent); }
.tbl tr:last-child td, .tbl tr:last-child th { border-bottom: 0; }
.tbl td.diff { background: var(--accent-soft); }
.tbl input, .tbl select, .tbl textarea { padding: 5px 7px; font-size: 13px; }

/* ---------- 미디어 ---------- */
.figure { border: 1.5px solid var(--line); border-radius: 8px; background: var(--paper); padding: 10px; }
.figure svg { width: 100%; height: auto; display: block; }
.figure .cap { font-size: 12px; color: var(--muted); margin-top: 6px; font-family: var(--mono); }
.mat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 12px; }
.mat { border: 1.5px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--paper-3); cursor: pointer; text-align: left; padding: 0; color: var(--ink); }
.mat:hover { border-color: var(--ink); }
.mat .thumb { aspect-ratio: 16/10; background: var(--paper-2); display: grid; place-items: center; overflow: hidden; position: relative; }
.mat .thumb img, .mat .thumb video { width: 100%; height: 100%; object-fit: cover; }
.mat .thumb svg { width: 88%; height: auto; }
.mat .kind { position: absolute; top: 6px; left: 6px; font-family: var(--mono); font-size: 10.5px; background: var(--ink); color: var(--paper-3); padding: 1px 6px; border-radius: 3px; }
.mat .meta { padding: 8px 10px; font-size: 13px; font-weight: 600; }
.mat .meta small { display: block; font-weight: 400; color: var(--muted); font-size: 12px; }

/* 업로드 영역 */
.drop { display: block; border: 2px dashed var(--line-2); border-radius: 8px; padding: 18px; text-align: center; color: var(--muted); cursor: pointer; transition: .15s; background: var(--paper); }
.drop.over, .drop:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); }
.drop b { color: var(--ink); }
.upbar { height: 4px; background: var(--paper-2); border-radius: 2px; overflow: hidden; margin-top: 8px; }
.upbar i { display: block; height: 100%; background: var(--accent); width: 0; transition: width .2s; }
.uplist { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); gap: 12px; margin-top: 12px; }
.upitem { border: 1.5px solid var(--line); border-radius: 8px; background: var(--paper-3); overflow: hidden; }
.upitem .media { position: relative; background: #111; }
.upitem .media img { width: 100%; display: block; max-height: 260px; object-fit: contain; background: var(--paper-2); }
.upitem .media video { width: 100%; display: block; max-height: 260px; background: #000; }
.upitem .body { padding: 8px 10px; display: grid; gap: 6px; }
.upitem .row { display: flex; gap: 6px; align-items: center; }
.pin { position: absolute; transform: translate(-50%, -100%); background: var(--navy); color: #fff; font: 700 11px var(--mono); min-width: 22px; height: 22px;
  border-radius: 11px 11px 11px 2px; display: grid; place-items: center; box-shadow: 0 2px 6px rgba(0,0,0,.35); pointer-events: auto; cursor: pointer; padding: 0 5px; border: 2px solid #fff; }
.markable { cursor: crosshair; }
.marks { margin: 0; padding-left: 0; list-style: none; font-size: 13px; display: grid; gap: 4px; }
.marks li { display: flex; gap: 6px; align-items: center; }
.marks .k { font: 700 11px var(--mono); background: var(--navy); color: #fff; border-radius: 9px; min-width: 20px; height: 20px; display: grid; place-items: center; flex: none; }

/* ---------- 드래그앤드롭 ---------- */
.pool { display: flex; flex-wrap: wrap; gap: 8px; min-height: 46px; padding: 10px; border: 1.5px dashed var(--line-2); border-radius: 8px; background: var(--paper); }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: 6px; background: var(--paper-3); border: 1.5px solid var(--ink);
  font-size: 13px; font-weight: 600; cursor: grab; user-select: none; touch-action: none; color: var(--ink); line-height: 1.25; }
.chip:active { cursor: grabbing; }
.chip.sel { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.chip.right { border-color: var(--teal); background: var(--teal-soft); }
.chip.wrong { border-color: var(--bad); background: var(--bad-soft); }
.chip .x { font-family: var(--mono); opacity: .55; font-size: 11px; }
.chip.dragging { opacity: .4; }
.buckets { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr)); gap: 10px; margin-top: 12px; }
.bucket { border: 1.5px solid var(--line-2); border-radius: 8px; padding: 8px; min-height: 96px; background: var(--paper-3); transition: .12s; }
.bucket.over, .pool.over { border-color: var(--accent); background: var(--accent-soft); }
.bucket h4 { margin: 0 0 8px; font-size: 12.5px; font-family: var(--mono); color: var(--ink-2); display: flex; justify-content: space-between; }
.bucket .items { display: flex; flex-wrap: wrap; gap: 6px; }
.bucket.pro h4 { color: var(--teal); } .bucket.con h4 { color: var(--bad); }
.drag-ghost { position: fixed; pointer-events: none; z-index: 1000; opacity: .9; transform: rotate(-2deg); box-shadow: 0 10px 24px rgba(0,0,0,.25); }

/* 순서 맞추기 */
.order { display: grid; gap: 6px; counter-reset: ord; }
.order .oi { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1.5px solid var(--line-2); border-radius: 7px; background: var(--paper-3); cursor: grab; touch-action: none; user-select: none; }
.order .oi::before { counter-increment: ord; content: counter(ord); font: 700 12px var(--mono); width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; background: var(--paper-2); flex: none; }
.order .oi.right { border-color: var(--teal); } .order .oi.right::before { background: var(--teal); color: #fff; }
.order .oi.wrong { border-color: var(--bad); } .order .oi.wrong::before { background: var(--bad); color: #fff; }
.order .oi .mv { margin-left: auto; display: flex; gap: 2px; }
.order .oi.placeholder { border-style: dashed; opacity: .5; }

/* ---------- 나란히 보기 ---------- */
.sbs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .sbs { grid-template-columns: 1fr; } }
.sbs .pane { border: 1.5px solid var(--line-2); border-radius: 8px; overflow: hidden; background: var(--paper); display: flex; flex-direction: column; }
.sbs .pane header { display: flex; gap: 8px; align-items: center; padding: 8px; border-bottom: 1px solid var(--line); background: var(--paper-3); }
.sbs .pane .view { aspect-ratio: 16/11; display: grid; place-items: center; padding: 10px; overflow: hidden; }
.sbs .pane .view img, .sbs .pane .view video { max-width: 100%; max-height: 100%; object-fit: contain; }
.sbs .pane .view svg { width: 100%; height: auto; }

/* ---------- 블록도 ---------- */
.blockdiag { width: 100%; height: auto; display: block; }
.blockdiag .blk { cursor: pointer; }
.blockdiag .blk rect { fill: var(--paper-3); stroke: var(--ink); stroke-width: 2; transition: .15s; }
.blockdiag .blk:hover rect, .blockdiag .blk.on rect { fill: var(--accent-soft); stroke: var(--accent); }
.blockdiag .blk text { fill: var(--ink); font-size: 13px; font-weight: 700; text-anchor: middle; pointer-events: none; font-family: var(--sans); }
.blockdiag .blk .sub { font-size: 10.5px; font-weight: 400; fill: var(--muted); font-family: var(--mono); }
.blockdiag .wire { fill: none; stroke: var(--line-2); stroke-width: 2.5; }
.blockdiag .wire.audio { stroke: var(--accent); } .blockdiag .wire.videow { stroke: var(--teal); }
.blockdiag.flow .wire.audio, .blockdiag.flow .wire.videow { stroke-dasharray: 8 6; animation: flow 1s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -14; } }
.blockdiag .group { fill: none; stroke: var(--ink-2); stroke-dasharray: 5 4; stroke-width: 1.5; }
.blockdiag .glabel { font: 700 11px var(--mono); fill: var(--ink-2); }
.blk-info { min-height: 80px; }
@media (prefers-reduced-motion: reduce) { .blockdiag.flow .wire { animation: none; } }

/* 스피커 배치 */
.room { width: 100%; max-width: 420px; height: auto; display: block; margin: 0 auto; }
.room .zone { fill: var(--teal-soft); opacity: .9; }
.room .zone-s { fill: var(--accent-soft); }

/* ---------- 간트 ---------- */
.gantt { overflow-x: auto; border: 1.5px solid var(--line-2); border-radius: 8px; background: var(--paper-3); }
.gantt table { border-collapse: collapse; font-size: 12.5px; min-width: 100%; }
.gantt th, .gantt td { border-bottom: 1px solid var(--line); padding: 0; height: 34px; }
.gantt .lab { position: sticky; left: 0; background: var(--paper-3); z-index: 2; padding: 4px 8px; min-width: 220px; border-right: 1.5px solid var(--line-2); }
.gantt .day { width: 26px; min-width: 26px; text-align: center; font: 10px var(--mono); color: var(--muted); border-left: 1px solid var(--line); }
.gantt .day.wk { background: color-mix(in srgb, var(--paper-2) 60%, transparent); }
.gantt .bar-cell { position: relative; }
.gantt .bar { position: absolute; top: 7px; height: 20px; border-radius: 4px; background: var(--ink); color: var(--paper-3); font: 600 10.5px var(--mono); display: flex; align-items: center; padding: 0 6px; white-space: nowrap; overflow: hidden; }
.gantt .bar.p-성능구현 { background: var(--accent); } .gantt .bar.p-검증 { background: var(--teal); } .gantt .bar.p-이관 { background: var(--warn); }
.gantt .bar.crit { box-shadow: 0 0 0 2px var(--bad); }
.gantt .bar.bad { background: repeating-linear-gradient(45deg, var(--bad), var(--bad) 5px, var(--bad-soft) 5px, var(--bad-soft) 10px); color: var(--bad); }
.gantt .ms { position: absolute; top: 9px; width: 14px; height: 14px; transform: rotate(45deg); background: var(--accent); border: 2px solid var(--paper-3); }
.gantt-edit .tbl { min-width: 720px; }
.gantt-edit input[type=number] { width: 70px; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin-top: 8px; }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -2px; margin-right: 4px; }

/* ---------- 원가 ---------- */
.cost-total { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr)); gap: 10px; }
.kpi { border: 1.5px solid var(--line-2); border-radius: 8px; padding: 10px 12px; background: var(--paper-3); }
.kpi .k { font-size: 12px; color: var(--muted); font-weight: 600; }
.kpi .v { font: 700 18px var(--mono); margin-top: 2px; word-break: break-all; }
.kpi.big { border-color: var(--ink); border-width: 2px; } .kpi.big .v { color: var(--accent); font-size: 21px; }
.stack { display: flex; height: 18px; border-radius: 4px; overflow: hidden; background: var(--paper-2); margin-top: 12px; }
.stack i { display: block; height: 100%; transition: width .3s; }
.money { text-align: right; font-family: var(--mono); }

/* ---------- 레벨 막대(기술 난이도) ---------- */
.lvbar { position: relative; height: 22px; background: var(--paper-2); border-radius: 4px; overflow: hidden; }
.lvbar .k { position: absolute; top: 0; bottom: 0; left: 0; background: var(--line-2); }
.lvbar .o { position: absolute; top: 4px; bottom: 4px; left: 0; background: var(--accent); border-radius: 2px; }
.lvbar span { position: absolute; right: 6px; top: 2px; font: 600 11px var(--mono); color: var(--ink); }

/* ---------- 설계 시뮬레이션 ---------- */
.sim { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 14px; }
@media (max-width: 760px) { .sim { grid-template-columns: 1fr; } }
.sim-cards { display: grid; gap: 8px; }
.sim-card { text-align: left; border: 1.5px solid var(--line-2); border-radius: 8px; padding: 10px 12px; background: var(--paper-3); cursor: pointer; color: var(--ink); }
.sim-card:hover { border-color: var(--ink); }
.sim-card.done { border-color: var(--teal); background: var(--teal-soft); cursor: default; }
.sim-card.shake { animation: shake .35s; border-color: var(--bad); }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
.sim-card b { display: block; } .sim-card small { color: var(--muted); }
.board { width: 100%; height: auto; display: block; border-radius: 8px; }
.board .layer { opacity: 0; transition: opacity .6s; } .board .layer.show { opacity: 1; }

/* ---------- 드로어 / 모달 ---------- */
.drawer-bg { position: fixed; inset: 0; background: rgba(10, 14, 22, .45); z-index: 80; opacity: 0; pointer-events: none; transition: .2s; }
.drawer-bg.open { opacity: 1; pointer-events: auto; }
.drawer { position: fixed; top: 0; right: 0; bottom: 0; width: min(560px, 100vw); background: var(--paper); z-index: 90; transform: translateX(105%); transition: transform .25s; display: flex; flex-direction: column; border-left: 2px solid var(--ink); }
.drawer.open { transform: none; }
.drawer.wide { width: min(980px, 100vw); }
.drawer header { padding: 14px 16px; border-bottom: 1.5px solid var(--line-2); display: flex; align-items: center; gap: 10px; background: var(--paper-3); }
.drawer header h3 { margin: 0; font-size: 17px; }
.drawer .body { padding: 16px; overflow-y: auto; flex: 1; }
.fb { border: 1.5px solid var(--line-2); border-radius: 8px; padding: 10px 12px; background: var(--paper-3); margin-bottom: 10px; }
.fb.unread { border-color: var(--accent); box-shadow: inset 4px 0 0 var(--accent); }
.fb .meta { font-size: 12px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 4px; }
.fb .msg { white-space: pre-wrap; }
.modal { position: fixed; inset: 0; z-index: 100; display: none; place-items: center; background: rgba(10,14,22,.6); padding: 16px; }
.modal.open { display: grid; }
.modal .box { background: var(--paper); border: 2px solid var(--ink); border-radius: 10px; max-width: 980px; width: 100%; max-height: 92vh; overflow: auto; }
.lightbox img, .lightbox video { max-width: 100%; max-height: 80vh; display: block; margin: 0 auto; }

/* ---------- 토스트 ---------- */
#toasts { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); z-index: 200; display: grid; gap: 8px; width: min(92vw, 420px); }
.toast { background: var(--navy); color: var(--on-navy); padding: 10px 14px; border-radius: 8px; font-size: 14px; box-shadow: 0 8px 20px rgba(0,0,0,.25); transition: .4s; }
.toast-ok { background: var(--teal); color: #fff; } .toast-warn { background: var(--navy); color: var(--on-navy); box-shadow: inset 4px 0 0 var(--accent), 0 8px 20px rgba(0,0,0,.25); } .toast-bad { background: var(--bad); color: #fff; }
.toast.out { opacity: 0; transform: translateY(8px); }

/* ---------- 로그인 ---------- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.auth { width: min(100%, 460px); background: var(--paper-3); border: 2px solid var(--ink); border-radius: 12px; padding: 26px; position: relative; box-shadow: var(--shadow); }
.auth h1 { margin: 6px 0 4px; font-size: 24px; line-height: 1.25; }
.auth .tabs { display: flex; gap: 0; margin: 18px 0 14px; border-bottom: 1.5px solid var(--line-2); }
.auth .tabs button { flex: 1; background: none; border: 0; padding: 9px; font-weight: 700; color: var(--muted); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -1.5px; font-size: 14px; }
.auth .tabs button.on { color: var(--ink); border-color: var(--accent); }
.auth form { display: grid; gap: 10px; }
.demo-banner { background: var(--warn-soft); color: var(--warn); font-size: 12.5px; padding: 8px 12px; border-radius: 6px; border: 1px solid var(--warn); }

/* ---------- 개발검토서(인쇄) ---------- */
.report { background: #fff; color: #111; padding: 28px 32px; font-size: 13px; line-height: 1.55; }
.report h1 { text-align: center; font-size: 24px; letter-spacing: .4em; margin: 0 0 4px; }
.report .sub { text-align: center; color: #555; font-size: 12px; margin-bottom: 14px; }
.report table { width: 100%; border-collapse: collapse; margin: 6px 0 14px; }
.report th, .report td { border: 1px solid #333; padding: 5px 7px; text-align: left; vertical-align: top; font-size: 12.5px; }
.report th { background: #f0eee8; white-space: nowrap; font-weight: 700; }
.report h2 { font-size: 15px; border-left: 5px solid #13213f; padding-left: 8px; margin: 18px 0 6px; }
.report .approve { float: right; border-collapse: collapse; margin: 0 0 8px 12px; width: auto; }
.report .approve td, .report .approve th { width: 70px; text-align: center; font-size: 11.5px; }
.report .approve td { height: 46px; }
.report .money { font-family: var(--mono); text-align: right; }
.report img { max-width: 220px; max-height: 160px; border: 1px solid #ccc; margin: 4px; }
.report .clear { clear: both; }
.print-only { display: none; }
@media print {
  body { background: #fff !important; }
  body > *:not(#printArea) { display: none !important; }
  #printArea { display: block !important; position: static; }
  #printArea .report { padding: 0; }
  .report h2 { break-after: avoid; } .report table { break-inside: auto; } .report tr { break-inside: avoid; }
  @page { size: A4; margin: 14mm; }
}

/* ---------- 기타 ---------- */
.row-flex { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.sep { height: 1px; background: var(--line); margin: 14px 0; border: 0; }
.tag { display: inline-block; font-size: 11.5px; padding: 1px 7px; border-radius: 4px; background: var(--paper-2); color: var(--ink-2); font-weight: 600; }
.score { font: 700 13px var(--mono); padding: 2px 8px; border-radius: 4px; background: var(--navy); color: var(--on-navy); }
.empty { text-align: center; color: var(--muted); padding: 22px; font-size: 14px; }
.hidden { display: none !important; }
details.more summary { cursor: pointer; font-weight: 600; font-size: 13.5px; color: var(--ink-2); }
.res-box { border: 2px solid var(--ink); background: var(--paper-2); display: flex; align-items: flex-end; justify-content: flex-end; padding: 3px 5px; font: 700 11px var(--mono); }

/* 교사 대시보드: 실시간 갱신된 행 강조 */
tr.flash td { animation: flashrow 2.2s ease-out; }
@keyframes flashrow { 0% { background: var(--accent-soft); } 100% { background: transparent; } }
#tabs { flex-wrap: nowrap; }

/* 좁은 화면 상단바 */
.brand { flex: 0 1 auto; }
.brand > div { min-width: 0; }
.brand-sub { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 600px) {
  .topbar-inner { gap: 8px; }
  .brand-title { font-size: 13.5px; }
  .savestate { font-size: 0; gap: 0; }
  .savestate .dot { width: 10px; height: 10px; }
}

/* ============================================================
 * 개념 학습 페이지 · 개념 연결 장치
 * ============================================================ */
.nav-links { display: flex; gap: 4px; }
.nav-links a { text-decoration: none; color: var(--ink-2); font-weight: 600; font-size: 13.5px; padding: 6px 10px; border-radius: 6px; white-space: nowrap; }
.nav-links a:hover { background: var(--paper-2); }
.nav-links a.on { background: var(--navy); color: var(--on-navy); }
.lshell { max-width: 1280px; margin: 0 auto; padding: 18px 16px 80px; display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 22px; }
.tree-wrap { position: sticky; top: 74px; align-self: start; max-height: calc(100vh - 92px); overflow-y: auto; display: grid; gap: 10px; padding-right: 2px; }
.tree-toggle { display: none; }
@media (max-width: 900px) {
  .lshell { grid-template-columns: minmax(0, 1fr); }
  .tree-wrap { position: static; max-height: none; display: none; }
  .tree-wrap.open { display: grid; }
  .tree-toggle { display: inline-flex; }
}
.t-unit { border: 1.5px solid var(--line-2); border-radius: 8px; background: var(--paper-3); overflow: hidden; }
.t-unit-h { background: var(--navy); color: var(--on-navy); font-weight: 700; font-size: 13.5px; padding: 8px 12px; }
.t-sub { border-top: 1px solid var(--line); }
.t-sub summary { display: flex; justify-content: space-between; gap: 8px; cursor: pointer; padding: 8px 12px; font-weight: 600; font-size: 13.5px; color: var(--ink-2); list-style: none; }
.t-sub summary::-webkit-details-marker { display: none; }
.t-sub summary::before { content: '▸'; color: var(--accent); margin-right: 4px; transition: transform .15s; display: inline-block; }
.t-sub[open] summary::before { transform: rotate(90deg); }
.t-sub summary > span:first-child { flex: 1; }
.t-cnt { font-size: 11.5px; color: var(--muted); }
.t-sub ul { list-style: none; margin: 0; padding: 0 0 8px 22px; border-left: 2px solid var(--accent-soft); margin-left: 16px; }
.t-c { display: flex; align-items: center; gap: 8px; padding: 5px 8px; border-radius: 6px; text-decoration: none; color: var(--ink); font-size: 13.5px; }
.t-c:hover { background: var(--paper-2); }
.t-c.on { background: var(--accent-soft); font-weight: 700; box-shadow: inset 3px 0 0 var(--accent); }
.t-dot { width: 9px; height: 9px; border-radius: 50%; border: 2px solid var(--line-2); flex: none; }
.t-dot.ok { background: var(--teal); border-color: var(--teal); }
.crumb { display: flex; gap: 6px; flex-wrap: wrap; font-size: 12.5px; color: var(--muted); margin-bottom: 10px; }
.crumb a { color: var(--accent); }
.lead { font-size: 16px; line-height: 1.6; max-width: 68ch; }
.points { margin: 0; padding-left: 20px; display: grid; gap: 8px; max-width: 75ch; }
.points li::marker { color: var(--accent); }
.points b { color: var(--ink); background: linear-gradient(transparent 62%, var(--accent-soft) 62%); }
.quiz { display: grid; gap: 8px; }
.qopt { text-align: left; border: 1.5px solid var(--line-2); background: var(--paper-3); color: var(--ink); border-radius: 8px; padding: 9px 12px; font-size: 14px; cursor: pointer; font-family: inherit; }
.qopt:hover { border-color: var(--accent); }
.qopt.right { border-color: var(--teal); background: var(--teal-soft); }
.qopt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.task-links { display: grid; gap: 8px; }
.task-link { display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px; border: 1.5px solid var(--line-2); border-radius: 8px; text-decoration: none; color: var(--ink); background: var(--paper-3); }
.task-link:hover { border-color: var(--accent); background: var(--accent-soft); }
.task-link small { display: block; color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.mm-wrap { overflow-x: auto; }
.mindmap { display: block; font-family: var(--sans); }
.mm-link { fill: none; stroke: var(--line-2); stroke-width: 1.6; }
.mm-node { cursor: pointer; }
.mm-node rect { fill: var(--paper-3); stroke: var(--line-2); stroke-width: 1.5; transition: .15s; }
.mm-node text { font-size: 12.5px; fill: var(--ink); pointer-events: none; }
.mm-node:hover rect, .mm-node:focus rect { stroke: var(--accent); stroke-width: 2.5; }
.mm-node:focus { outline: none; }
.mm-root rect { fill: var(--ink-2); stroke: none; } .mm-root text { fill: var(--paper-3); font-weight: 700; }
.mm-unit rect { fill: var(--navy); stroke: none; } .mm-unit text { fill: var(--on-navy); font-weight: 700; }
.mm-sub rect { fill: var(--accent); stroke: none; } .mm-sub text { fill: var(--on-accent); font-weight: 700; }
.mm-c.ok rect { fill: var(--teal-soft); stroke: var(--teal); }
.mm-tg { font: 700 14px var(--mono); }
.mm-unit .mm-tg { fill: var(--on-navy); } .mm-sub .mm-tg { fill: var(--on-accent); }
.mm-ck { fill: var(--teal) !important; font-weight: 700; }
/* 과제 화면의 개념 연결 */
.cchip { display: inline-flex; align-items: center; gap: 5px; border: 1.5px solid var(--accent); background: var(--accent-soft); color: var(--ink); border-radius: 999px;
  padding: 3px 11px; font-size: 12.5px; font-weight: 600; cursor: pointer; font-family: inherit; text-decoration: none; line-height: 1.4; text-align: left; }
.cchip::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.cchip:hover { background: var(--accent); color: var(--on-accent); }
.cchip.ok::before { background: var(--teal); }
.linkbox { margin: -2px 0 14px; padding: 10px 12px; border-radius: 8px; background: var(--paper-2); border: 1px dashed var(--line-2); display: grid; gap: 8px; }
.linkbox .lq { font-size: 13.5px; color: var(--ink-2); }
.linkbox .lq b { color: var(--accent); font-family: var(--mono); font-size: 11.5px; letter-spacing: .04em; margin-right: 6px; }
.linkbox .find { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 12.5px; }
.linkbox .find button.opt { border: 1.5px dashed var(--line-2); background: var(--paper-3); border-radius: 999px; padding: 3px 11px; font-size: 12.5px; cursor: pointer; color: var(--ink); font-family: inherit; }
.linkbox .find button.opt:hover { border-color: var(--accent); }
.linkbox .find button.opt.no { border-color: var(--bad); color: var(--bad); text-decoration: line-through; cursor: default; }
.review { display: inline-flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 12.5px; color: var(--ink-2); }

/* 개념 지도(메인)로 돌아가기 */
.home-btn svg { flex: none; }
.home-btn.on { box-shadow: 0 0 0 3px var(--accent-soft); }
.fab-home { position: fixed; z-index: 60; right: max(18px, env(safe-area-inset-right, 0px)); bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  display: inline-flex; align-items: center; gap: 8px; padding: 11px 16px; border-radius: 999px; border: 0; cursor: pointer;
  background: var(--navy); color: var(--on-navy); font: 700 14px var(--sans); box-shadow: 0 10px 24px -8px rgba(19,33,63,.55), 0 0 0 3px var(--accent-soft); }
.fab-home:hover { background: var(--ink-2); }
@media (max-width: 600px) { .home-btn span, .fab-home span { display: none; } .fab-home { padding: 13px; } }