:root {
  --bg: #f3f1ec;
  --surface: #ffffff;
  --surface-2: #fcfbf9;
  --ink: #1f1b17;
  --muted: #5e5850;
  --line: #e2dcd2;
  --line-strong: #8c8984;
  --grid-minor: #e6e1d8;
  --accent: #e8560b;          /* 주황: 체크박스·선택한 꼭짓점·그리기 미리보기 */
  --accent-text: #c2470a;     /* 흰 바탕 위 주황 글자(대비 4.5:1 이상) */
  --accent-ink: #ffffff;
  --accent-soft: #d7d7d7;     /* 포커스 링·길이 라벨 강조 */
  --logo-cut: #ea6725;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --warn-soft: #fff4e5;
  --warn-ink: #8a4b00;
  --tile-full: #343434;
  --tile-full-line: #fcfbf9;
  --tile-full-num: #ffffff;
  --tile-cut: #f4c99b;
  --tile-cut-line: #e8560b;
  --wall: #1f1b17;
  --canvas-bg: #faf9f6;
  --btn-dark: #1f1b17;
  --btn-dark-disabled: #aaa5a2;
  --calc-btn-disabled: #cfcecc; /* 계산하기 버튼 비활성 */
  --radius: 20px;
  --shadow: 0 1px 2px rgba(31, 27, 23, .05), 0 8px 24px rgba(31, 27, 23, .04);
  --banner-h: 62px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121110;
    --surface: #1c1a18;
    --surface-2: #232120;
    --ink: #eeebe6;
    --muted: #a8a299;
    --line: #34302c;
    --line-strong: #6e6a64;
    --grid-minor: #2a2724;
    --accent: #f07a3a;
    --accent-text: #f59a63;
    --accent-ink: #1f1b17;
    --accent-soft: #3d3a37;
    --logo-cut: #ea6725;
    --danger: #ff8a7a;
    --danger-soft: #3a1a17;
    --warn-soft: #33260f;
    --warn-ink: #f5c27a;
    --tile-full: #4a4744;
    --tile-full-line: #1c1a18;
    --tile-full-num: #ffffff;
    --tile-cut: #a8642a;
    --tile-cut-line: #f07a3a;
    --wall: #eeebe6;
    --canvas-bg: #171513;
    --btn-dark: #eeebe6;
    --btn-dark-disabled: #4a4744;
    --calc-btn-disabled: #4a4744;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

@media (min-width: 768px) {
  :root { --banner-h: 102px; }
}

* { box-sizing: border-box; }

/* 스크롤바 자리를 항상 비워 둔다: 계산 화면(스크롤 없음)과 결과 화면(스크롤 있음)에서 배너·본문이 옆으로 밀리지 않게 */
html { -webkit-text-size-adjust: 100%; scrollbar-gutter: stable; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans KR", system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  padding-bottom: calc(var(--banner-h) + 24px + env(safe-area-inset-bottom));
}

button, input { font: inherit; color: inherit; }

[hidden] { display: none !important; }

/* ---------- 헤더 ---------- */
.app-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 16px 20px;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand-name { display: block; font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
.brand-mark { width: 44px; height: 44px; flex: none; }
.brand-mark rect, .brand-mark path { fill: var(--ink); }
.brand-mark .cut { fill: var(--logo-cut); }
.tagline { margin: 0; color: var(--muted); font-size: 13px; }

main { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* ---------- 레이아웃 ---------- */
.screen { display: grid; gap: 16px 20px; }

.calc-layout {
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "canvas" "tile" "action" "ad";
}
.area-canvas { grid-area: canvas; }
.area-tile { grid-area: tile; }
.area-action { grid-area: action; }

.result-layout {
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "count" "spare" "summary" "ad" "viz" "again";
}
.area-count { grid-area: count; }
.area-spare { grid-area: spare; }
.area-summary { grid-area: summary; }
.area-viz { grid-area: viz; }
.area-again { grid-area: again; }
.area-ad { grid-area: ad; }

@media (min-width: 900px) {
  .calc-layout {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "canvas tile"
      "canvas action"
      "canvas ad";
    align-items: start;
  }
  .result-layout {
    grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
    grid-template-rows: auto auto auto auto 1fr;
    grid-template-areas:
      "count   viz"
      "spare   viz"
      "summary viz"
      "again   viz"
      "ad      viz";
    align-items: start;
  }
}

/* ---------- 카드 ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  min-width: 0;
}
.card h2, .card h3 {
  margin: 0 0 16px;
  font-size: 17px; font-weight: 700; letter-spacing: -0.01em;
  display: flex; align-items: center; gap: 8px;
}
.card h3 { font-size: 15px; margin-bottom: 12px; }
.card-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 4px 16px;
  flex-wrap: wrap; margin-bottom: 16px;
}
.card-head h2, .card-head h3 { margin: 0; }
.area-viz .card-head { align-items: center; margin-bottom: 14px; }
.area-viz .card-head h3 { font-size: 17px; }
.hint { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.hint.center { text-align: center; }

/* ---------- 입력 ---------- */
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
.field { min-width: 0; }
.field label { display: block; font-size: 13px; font-weight: 500; color: var(--muted); margin-bottom: 6px; }
.input-wrap {
  display: flex; align-items: center;
  border: 1.5px solid var(--line-strong);
  border-radius: 12px;
  background: var(--surface-2);
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.input-wrap:focus-within { border-color: var(--ink); background: var(--surface); box-shadow: 0 0 0 3px var(--accent-soft); }
.input-wrap input {
  flex: 1; min-width: 0; width: 100%;
  border: 0; background: transparent; outline: none;
  padding: 12px 4px 12px 14px;
  font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums;
}
.unit { padding-right: 14px; color: var(--muted); font-size: 13px; }
.field.invalid .input-wrap { border-color: var(--danger); background: var(--danger-soft); }
.field-error { margin: 6px 0 0; min-height: 0; color: var(--danger); font-size: 12.5px; font-weight: 500; }
.field-error:empty { margin: 0; }

/* ---------- 캔버스 크기 드롭다운 (벽 모양 카드 오른쪽 아래) ---------- */
.canvas-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 8px 12px;
  flex-wrap: wrap; margin-top: 12px;
}
.canvas-foot .field-error { margin: 0; }
.eye-toggle .eye-closed { display: none; }
.eye-toggle[aria-pressed="false"] .eye-open { display: none; }
.eye-toggle[aria-pressed="false"] .eye-closed { display: block; }
.eye-toggle[aria-pressed="true"] { color: var(--accent-text); font-weight: 600; }
.eye-toggle[aria-pressed="false"] { color: var(--muted); }
.board-select {
  display: inline-flex; align-items: center; gap: 8px; margin-left: auto;
  font-size: 13px; font-weight: 500; color: var(--muted);
}
.board-select select {
  min-height: 40px; padding: 0 34px 0 12px;
  border: 1px solid var(--line-strong); border-radius: 10px;
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='m6 8 4 4 4-4' fill='none' stroke='%235d686d' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 10px center / 16px;
  color: var(--ink); font-size: 14px; font-weight: 600; cursor: pointer;
  appearance: none; -webkit-appearance: none;
}
.board-select select:focus-visible { border-color: var(--ink); box-shadow: 0 0 0 3px var(--accent-soft); outline: none; }

/* ---------- 버튼 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 0; border-radius: 14px; cursor: pointer;
  padding: 11px 18px; font-weight: 700;
  transition: background .15s, opacity .15s, transform .05s;
}
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn-lg { width: 100%; min-height: 56px; padding: 14px 20px; font-size: 17px; }
/* 계산하기 버튼: 활성 #1F1B17, 비활성 --calc-btn-disabled */
.btn-primary { background: var(--btn-dark); color: var(--surface); }
.btn-primary:disabled { background: var(--calc-btn-disabled); color: #ffffff; cursor: not-allowed; }
/* 이미지로 저장 버튼: 계산하기 버튼과 같은 색 */
#vizSave { min-height: 44px; padding: 0 14px; border: 0; border-radius: 12px; background: var(--btn-dark); color: var(--surface); font-weight: 600; }
#vizSave:disabled { background: var(--btn-dark-disabled); color: #ffffff; opacity: 1; }
.btn-secondary { background: var(--surface); color: var(--ink); border: 1.5px solid var(--line-strong); }
.btn-secondary:hover { border-color: var(--ink); }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }

/* ---------- 도구 막대 ---------- */
.toolbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  margin-bottom: 12px;
}
.tool {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 40px; padding: 0 12px;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--surface); cursor: pointer;
  font-size: 13px; font-weight: 500;
}
.tool.icon-only { width: 40px; padding: 0; justify-content: center; }
.tool svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.tool:hover:not(:disabled) { border-color: var(--line-strong); }
.tool:disabled { color: #b3aca2; cursor: not-allowed; }
/* 켜진 도구: 배경·테두리는 그대로, 아이콘과 글자만 주황 */
.tool.toggle[aria-pressed="true"] { color: var(--accent-text); font-weight: 600; }
.tool.check { gap: 8px; cursor: pointer; user-select: none; }
/* 수평·수직 체크박스: 켜지면 주황 바탕에 흰 체크(10px) */
.tool.check input {
  appearance: none; -webkit-appearance: none;
  width: 18px; height: 18px; margin: 0; flex: none;
  border: 1.5px solid var(--line-strong); border-radius: 4px;
  background: var(--surface) no-repeat center / 10px 10px;
  cursor: pointer;
}
.tool.check input:checked {
  border-color: var(--accent);
  background-color: var(--accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2 6.3 4.8 9 10 3.2' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
/* Shift로 잠시 켜진 상태: 테두리를 강조하고 Shift 키 아이콘을 눌린 모양으로 */
.tool.check.shift-on { border-color: var(--accent); }
.tool.check.shift-on .key { background: var(--accent-soft); color: var(--ink); border-color: var(--line-strong); }
.tool.check:has(input:focus-visible) { outline: 3px solid var(--ink); outline-offset: 2px; }
.key {
  display: inline-flex; align-items: center;
  padding: 0 5px; border-radius: 4px;
  border: 1px solid var(--line-strong); border-bottom-width: 2px;
  background: var(--surface-2); color: var(--muted);
  font-size: 10px; font-weight: 600; line-height: 1.4;
}
.tool-group { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
/* 사각형 그리기 아이콘: 네 모서리 원형 핸들(속을 채워 선 위에 얹는다) */
.tool svg .handle circle { fill: var(--surface); stroke-width: 1.5; }
.tool-group-end { display: flex; gap: 4px; margin-left: auto; }

/* ---------- 그리기 캔버스 ---------- */
.canvas-wrap {
  position: relative;
  height: clamp(280px, 82vw, 440px);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--canvas-bg);
  overflow: hidden;
}
@media (min-width: 900px) { .canvas-wrap { height: clamp(420px, 62vh, 620px); } }
.draw-svg { width: 100%; height: 100%; display: block; touch-action: none; user-select: none; -webkit-user-select: none; }
.draw-svg.drawing { cursor: crosshair; }
.canvas-wrap.zoomed .draw-svg { cursor: grab; }
.canvas-wrap.zoomed .draw-svg.drawing { cursor: crosshair; }
.draw-svg.panning, .canvas-wrap.zoomed .draw-svg.panning { cursor: grabbing; }

/* 캔버스 줌 컨트롤: 캔버스 오른쪽 위 */
.canvas-zoom {
  position: absolute; top: 8px; right: 8px; z-index: 4;
  display: flex; align-items: center; gap: 2px; padding: 3px;
  /* 배경만 90% 불투명(뒤 격자가 살짝 비침). 버튼·글자는 그대로 */
  background: rgba(255, 255, 255, .9);
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  border: 1px solid var(--line); border-radius: 12px;
  box-shadow: 0 4px 12px rgba(31, 27, 23, .08);
}
.zoom-btn {
  display: grid; place-items: center; width: 36px; height: 36px;
  border: 0; border-radius: 9px; background: transparent; cursor: pointer; color: var(--ink);
}
.zoom-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.zoom-btn:hover:not(:disabled) { background: var(--surface-2); }
.zoom-btn:disabled { opacity: .35; cursor: not-allowed; }
.zoom-text {
  min-width: 54px; height: 36px; padding: 0 4px;
  border: 0; border-radius: 9px; background: transparent; cursor: pointer;
  font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ink);
}
.zoom-text:hover { background: var(--surface-2); }

.c-outer { fill: var(--surface); stroke: var(--grid-minor); stroke-width: 1.5px; vector-effect: non-scaling-stroke; }
.c-grid { fill: none; stroke: var(--grid-minor); stroke-width: 1px; vector-effect: non-scaling-stroke; }
.c-grid.major { stroke: var(--line-strong); }
.c-shape { fill: var(--wall); fill-opacity: .1; }
.c-seg { stroke: var(--wall); stroke-width: 2.5px; stroke-linecap: round; vector-effect: non-scaling-stroke; }
.c-seg.bad { stroke: var(--danger); stroke-width: 4px; }
.c-hit-seg { stroke: transparent; stroke-width: 28px; vector-effect: non-scaling-stroke; cursor: pointer; pointer-events: stroke; }
.c-rect-preview { fill: var(--accent); fill-opacity: .12; stroke: var(--accent); stroke-width: 2px; stroke-dasharray: 6 5; vector-effect: non-scaling-stroke; pointer-events: none; }
.c-preview { stroke: var(--accent); stroke-width: 2px; stroke-dasharray: 6 5; vector-effect: non-scaling-stroke; }
.c-vtx { fill: var(--surface); stroke: var(--wall); stroke-width: 2px; vector-effect: non-scaling-stroke; pointer-events: none; }
.c-vtx.start { fill: var(--accent); stroke: var(--accent); }
.c-vtx.active { fill: var(--accent); }
/* 중단점: 속이 빈 강조 점 + 바깥 링 */
.c-vtx.resume { fill: var(--surface); stroke: var(--accent); stroke-width: 3px; }
.c-resume-ring { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5px; stroke-dasharray: 3 3; vector-effect: non-scaling-stroke; pointer-events: none; }
.c-hit-vtx { fill: transparent; cursor: grab; }
.c-hit-vtx:active { cursor: grabbing; }
.c-cursor { fill: var(--accent); pointer-events: none; }
.c-label {
  fill: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums;
  paint-order: stroke; stroke: var(--surface); stroke-linejoin: round; pointer-events: none;
}
.c-label.bad { fill: var(--danger); }
.c-len { cursor: pointer; }
.c-len-hit { fill: transparent; }
.c-len:hover .c-len-hit { fill: var(--accent-soft); }
.c-seg.editing { stroke: var(--accent); stroke-width: 4px; }
.len-editor {
  position: absolute; z-index: 5; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 4px;
  padding: 4px 8px; border-radius: 8px;
  background: var(--surface); border: 1.5px solid var(--accent);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .18);
  font-size: 12px; color: var(--muted);
}
.len-editor input {
  width: 72px; border: 0; outline: none; background: transparent;
  font-size: 15px; font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; text-align: right;
}
.len-editor.invalid { border-color: var(--danger); background: var(--danger-soft); }
.c-dim { fill: var(--muted); font-weight: 500; pointer-events: none; }

/* ---------- 결과 ---------- */
.area-count { padding: 24px; box-shadow: none; }
.eyebrow { margin: 0; color: var(--muted); font-size: 14px; font-weight: 500; }
.big-number { margin: 4px 0 18px; font-size: 64px; font-weight: 700; line-height: 1; letter-spacing: -0.04em; font-variant-numeric: tabular-nums; }
.big-unit { font-size: 24px; font-weight: 600; margin-left: 6px; letter-spacing: 0; }
.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.split-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px; border-radius: 12px; background: var(--surface-2);
}
.split-label { font-size: 14px; color: var(--muted); }
.split-item b { margin-left: auto; font-size: 20px; font-variant-numeric: tabular-nums; }
.split-item small { font-size: 14px; font-weight: 500; }
.split .swatch { width: 18px; height: 18px; }
.reuse-note { margin: 16px 0 0; padding-top: 14px; border-top: 1px solid var(--line); font-size: 14px; line-height: 1.6; color: var(--ink); }
.notice {
  margin: 14px 0 0; padding: 10px 12px; border-radius: 10px;
  background: var(--warn-soft); color: var(--warn-ink); font-size: 14px; font-weight: 500;
}

.swatch {
  display: inline-block; width: 16px; height: 16px; border-radius: 4px; flex: none;
  border: 1.5px solid var(--tile-full); background: var(--tile-full);
}
.swatch-cut {
  border-color: var(--tile-cut-line);
  background: repeating-linear-gradient(45deg, var(--tile-cut) 0 3px, var(--tile-cut-line) 3px 5px);
}
.swatch-ghost {
  border: 1.5px dashed var(--tile-cut-line); background: transparent; opacity: .8;
}

.spare-row { display: flex; align-items: center; gap: 12px; }
.spare-row label { font-size: 16px; font-weight: 700; color: var(--ink); }
.spare-row .input-wrap input { padding: 11px 4px 11px 14px; font-size: 18px; }
.spare-row .input-wrap { width: 140px; margin-left: auto; }
.spare-hint { margin: 8px 0 0; text-align: right; }
.purchase { margin: 16px 0 0; display: grid; gap: 8px; font-size: 14px; }
.purchase div, .summary div { display: flex; justify-content: space-between; gap: 12px; }
.purchase dt, .summary dt { color: var(--muted); }
.purchase dd, .summary dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.purchase .total { align-items: baseline; border-top: 1px solid var(--line); padding-top: 12px; margin-top: 6px; }
.purchase .total dt { color: var(--ink); font-size: 16px; font-weight: 700; }
.purchase .total dd { color: var(--ink); font-size: 18px; font-weight: 700; }
.summary { margin: 0; display: grid; gap: 8px; font-size: 14px; }

.zoom-ctrl { display: flex; flex-wrap: wrap; gap: 6px; }
.viz-wrap {
  height: clamp(300px, 92vw, 520px);
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--canvas-bg); overflow: hidden;
}
@media (min-width: 900px) { .viz-wrap { height: clamp(460px, 66vh, 680px); } }
.viz-svg { width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; user-select: none; -webkit-user-select: none; }
.viz-svg.panning { cursor: grabbing; }
.legend { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 13px; }
.legend li { display: inline-flex; align-items: center; gap: 8px; }

.v-full { fill: var(--tile-full); }
.v-cut-bg { fill: var(--tile-cut); }
.v-hatch { stroke: var(--tile-cut-line); }
.v-grid { fill: none; stroke: var(--tile-full-line); stroke-width: 1px; vector-effect: non-scaling-stroke; }
.v-ghost { fill: var(--tile-cut); fill-opacity: .14; stroke: var(--tile-cut-line); stroke-opacity: .7; stroke-width: 1px; stroke-dasharray: 4 3; vector-effect: non-scaling-stroke; }
.v-num { fill: var(--ink); fill-opacity: .72; font-weight: 700; font-variant-numeric: tabular-nums; pointer-events: none; }
.v-num.full { fill: var(--tile-full-num); fill-opacity: 1; }
.v-num.ghost { fill: var(--tile-cut-line); fill-opacity: .55; }
.num-chip {
  display: inline-grid; place-items: center; min-width: 18px; height: 18px; padding: 0 4px;
  border-radius: 4px; border: 1.5px solid var(--tile-full); background: var(--tile-full);
  font-size: 11px; font-weight: 700; color: var(--tile-full-num);
}
.v-wall { fill: none; stroke: var(--wall); stroke-width: 2.5px; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
.v-dimline { stroke: var(--muted); stroke-width: 1px; vector-effect: non-scaling-stroke; }
.v-dim { fill: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; paint-order: stroke; stroke: var(--canvas-bg); stroke-linejoin: round; }
.v-seg-label { fill: var(--muted); font-weight: 500; paint-order: stroke; stroke: var(--canvas-bg); stroke-linejoin: round; }

/* ---------- 하단 배너 ---------- */
.banner {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  height: calc(var(--banner-h) + env(safe-area-inset-bottom));
  padding: 6px 16px calc(6px + env(safe-area-inset-bottom));
  background: var(--surface);
  border-top: 1px solid var(--line);
  display: flex; justify-content: center; align-items: center;
}
.ad-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  border: 1.5px dashed var(--line-strong); border-radius: 10px;
  color: var(--muted); font-size: 12px; background: var(--surface-2);
  position: relative;
}
.ad-placeholder--banner { width: 100%; max-width: 728px; height: 100%; flex-direction: row; gap: 8px; }
.ad-placeholder--rect { width: 100%; max-width: 300px; aspect-ratio: 300 / 250; font-size: 14px; }
.ad-placeholder strong { color: var(--ink); font-size: 16px; }
.ad-badge {
  font-size: 10px; font-weight: 800; letter-spacing: .06em;
  padding: 1px 6px; border-radius: 4px; background: var(--line); color: var(--muted);
}

/* ---------- 본문 광고(계산·결과 화면) ---------- */
.content-ad {
  display: grid; justify-items: center; gap: 6px;
  padding: 12px 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.content-ad-label { justify-self: start; font-size: 11px; font-weight: 700; color: var(--muted); letter-spacing: .04em; }
.calc-ad { margin-top: 12px; } /* 계산하기 버튼과 간격 확보 */
.content-ad-slot { width: 100%; display: grid; place-items: center; min-height: 250px; }

/* ---------- 토스트 ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--banner-h) + 20px + env(safe-area-inset-bottom));
  transform: translate(-50%, 12px);
  background: var(--ink); color: var(--surface);
  padding: 10px 16px; border-radius: 10px; font-size: 14px; font-weight: 500;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
  z-index: 60; max-width: calc(100vw - 32px); text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}