:root {
  /* 배경: 완전 순백색 */
  --bg: #ffffff;
  --panel: #ffffff;

  /* 테두리 */
  --line: #f1f3f2;
  --line-strong: #e2e8f0;

  /* 텍스트 */
  --text: #1a1a1a;
  --muted: #666666;

  /* 포인트 컬러: 엑셀 그린 */
  --primary: #107c41;
  --primary-soft: #e8f5ee;
  --primary-hover: #0b5c30;

  /* 상태 색상 */
  --blue: #2563eb;
  --blue-soft: #eff6ff;
  --amber: #d97706;
  --amber-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow:
    0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family:
    "Pretendard Variable",
    Pretendard,
    -apple-system,
    BlinkMacSystemFont,
    "Apple SD Gothic Neo",
    sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
}

/* 사이드바 */
.toc {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
  background: #ffffff;
  border-right: 1px solid var(--line);
  padding: 40px 24px;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 32px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 16px;
  font-weight: 800;
  background: var(--primary);
}

.brand h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.brand p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.toc .group {
  margin-top: 32px;
}

.toc .group-title {
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #a0a0a0;
  margin: 0 0 12px 8px;
  font-weight: 600;
}

.toc a {
  display: block;
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 500;
  color: #555555;
  transition: all 0.2s;
}

.toc a:hover {
  background: #f8faf9;
  color: var(--primary);
}

.toc a.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}

/* 본문 */
.main {
  padding: 60px 80px;
  max-width: 1200px;
}

.hero {
  margin-bottom: 60px;
}

.hero .eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 12px;
}

.hero h2 {
  font-size: 36px;
  font-weight: 800;
  margin: 0 0 16px;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

.hero-grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.hero-grid .tile {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.hero-grid .tile .k {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.hero-grid .tile .v {
  display: block;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}

section {
  margin-top: 60px;
}

.sec-title {
  margin: 0 0 12px;
  font-size: 24px;
  font-weight: 700;
}

.sec-desc {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 16px;
}

/* 카드 및 스텝 */
.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.card + .card {
  margin-top: 20px;
}

.card h4 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.step .num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.step h4 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.step p {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* 목록 */
.list {
  margin: 0;
  padding-left: 20px;
}

.list li {
  margin-bottom: 10px;
}

.list li:last-child {
  margin-bottom: 0;
}

/* 안내 콜아웃 */
.info,
.warn,
.danger {
  padding: 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-top: 24px;
  border-left: 4px solid;
}

.info {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #475569;
}

.warn {
  background: #fffbeb;
  border-color: #fbbf24;
  color: #92400e;
}

.danger {
  background: #fef2f2;
  border-color: #f87171;
  color: #991b1b;
}

/* 일반 표 */
.table {
  width: 100%;
  border-collapse: collapse;
}

.table th {
  padding: 12px 16px;
  background: #f8fafc;
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  color: #64748b;
  border-bottom: 1px solid var(--line-strong);
}

.table td {
  padding: 14px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.badge-green {
  background: #dcfce7;
  color: #166534;
}

.badge-blue {
  background: #dbeafe;
  color: #1e40af;
}

.badge-gray {
  background: #f1f5f9;
  color: #475569;
}

.badge-red {
  background: #fef2f2;
  color: #dc2626;
}

.badge-yellow {
  background: #fef9c3;
  color: #854d0e;
}

/* =============================================
   엑셀 화면 목업
   ============================================= */

.xl-mock {
  border: 1px solid #d1d5db;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  margin-top: 24px;
}

.xl-titlebar {
  height: 34px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  position: relative;
}

.xl-titlebar .tb-controls {
  position: absolute;
  right: 12px;
  display: flex;
  gap: 6px;
}

.xl-titlebar .tb-controls span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
  background: rgba(255, 255, 255, 0.45);
}

/* 보안 경고 바 */
.xl-securitybar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: #fffbe6;
  border-bottom: 1px solid #f0e6b3;
  font-size: 12.5px;
  color: #6b5d1f;
  flex-wrap: wrap;
}

.xl-securitybar .sec-btn {
  border: 2px solid var(--danger);
  background: #fff;
  color: #374151;
  border-radius: 4px;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

/* 수식 입력줄 */
.xl-formula {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-bottom: 1px solid var(--line-strong);
  background: #fff;
  font-size: 12px;
}

.xl-formula .cell-ref {
  min-width: 52px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 3px 8px;
  text-align: center;
  color: #374151;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 11px;
}

.xl-formula .fx {
  color: #9ca3af;
  font-style: italic;
  font-weight: 700;
}

.xl-formula .formula-text {
  flex: 1;
  border: 2px solid var(--danger);
  border-radius: 4px;
  padding: 3px 10px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 11px;
  color: #1f2937;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 엑셀 리본 버튼 줄 (파일검증/파일수합 등) */
.xl-btnrow {
  display: flex;
  gap: 8px;
  padding: 10px 14px;
  background: #f8faf9;
  border-bottom: 1px solid var(--line-strong);
  flex-wrap: wrap;
}

.xl-btn {
  border: 1px solid #9ca3af;
  background: linear-gradient(#ffffff, #f3f4f6);
  border-radius: 4px;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 600;
  color: #374151;
  white-space: nowrap;
}

.xl-btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.xl-btn.dark {
  background: #4b5563;
  border-color: #4b5563;
  color: #fff;
}

.xl-btn.accent {
  border: 2px solid var(--danger);
}

/* 엑셀 시트 표 */
.xl-sheet {
  overflow-x: auto;
}

.xl-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  min-width: 560px;
}

.xl-table th,
.xl-table td {
  border: 1px solid #d8dee6;
  padding: 6px 10px;
  text-align: center;
  white-space: nowrap;
  color: #1f2937;
}

.xl-table th {
  font-weight: 700;
  background: #f3f4f6;
}

/* 엑셀 헤더 색상 (원본 파일 색감 재현) */
.xl-table .h-peach {
  background: #fce4d6;
}

.xl-table .h-yellow {
  background: #fff2cc;
}

.xl-table .h-green {
  background: #e2efda;
}

.xl-table .h-blue {
  background: #ddebf7;
}

.xl-table .h-purple {
  background: #e4dfec;
}

.xl-table .h-orange {
  background: #fbe2d5;
}

/* 셀 상태 */
.xl-table td.ok {
  color: #166534;
  font-weight: 700;
}

.xl-table td.err {
  background: #ffc7ce;
  color: #9c0006;
  font-weight: 700;
}

.xl-table td.neg {
  background: #ffc7ce;
  color: #9c0006;
}

.xl-table td.free {
  color: #dc2626;
  font-weight: 600;
}

.xl-table tr.warn-row td {
  background: #ffe699;
}

.xl-table td.muted {
  color: #9ca3af;
}

.xl-table td.currency,
.xl-table td.num {
  font-family: "SF Mono", Consolas, monospace;
  font-size: 11px;
}

.xl-table td.currency {
  text-align: right;
}

.xl-table .cell-focus {
  outline: 2px solid var(--danger);
  outline-offset: -2px;
}

/* 시트 탭 */
.xl-sheettabs {
  display: flex;
  gap: 2px;
  padding: 6px 10px;
  background: #f3f4f6;
  border-top: 1px solid var(--line-strong);
  overflow-x: auto;
}

.xl-tab {
  padding: 4px 12px;
  font-size: 11.5px;
  font-weight: 600;
  border: 1px solid #d1d5db;
  border-radius: 4px 4px 0 0;
  background: #e5e7eb;
  color: #4b5563;
  white-space: nowrap;
}

.xl-tab.active {
  background: #fff;
  color: var(--primary);
  border-bottom-color: #fff;
}

.xl-tab.t-orange {
  background: #f4b183;
  color: #7c2d12;
}

.xl-tab.t-red {
  background: #ff5050;
  color: #fff;
}

.xl-tab.t-blue {
  background: #2e75b6;
  color: #fff;
}

/* 목업 아래 설명 박스 */
.xl-caption {
  padding: 20px 24px;
  background: #f8faf8;
  border: 1px solid #e2e8e4;
  border-top: none;
  border-radius: 0 0 12px 12px;
  font-size: 14.5px;
  color: #374151;
  margin-bottom: 24px;
}

.xl-mock.has-caption {
  border-radius: 12px 12px 0 0;
  margin-bottom: 0;
}

/* 파일 경로 표시 */
.path {
  display: block;
  margin-top: 16px;
  padding: 12px 16px;
  background: #f8fafc;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 12.5px;
  color: #334155;
  overflow-x: auto;
  white-space: nowrap;
}

.path .k {
  color: var(--primary);
  font-weight: 700;
  font-family: Pretendard, sans-serif;
  margin-right: 8px;
}

/* 우클릭 메뉴 목업 */
.ctx-menu {
  width: 240px;
  background: #fff;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
  padding: 6px;
  font-size: 12.5px;
  margin-top: 16px;
}

.ctx-menu .item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 6px;
  color: #374151;
}

.ctx-menu .item.hl {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
}

.ctx-menu .item .arrow {
  margin-left: auto;
  color: #9ca3af;
}

.ctx-menu .divider {
  height: 1px;
  background: #e5e7eb;
  margin: 4px 6px;
}

/* 2단 미니 그리드 */
.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.mini {
  border: 1px solid var(--line);
  padding: 20px;
  border-radius: 10px;
}

.mini h5 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
}

/* 좁은 미니 박스 안의 엑셀 표는 최소 폭 없이 컬럼에 맞춤 */
.mini .xl-table {
  min-width: 0;
}

.mini p {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
}

/* 푸터 */
.foot {
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

.foot a {
  color: var(--primary);
  font-weight: 600;
}

/* 반응형 */
@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 24px;
  }

  .toc nav {
    display: flex;
    gap: 12px;
    overflow: auto;
  }

  .toc .group {
    margin-top: 0;
    flex-shrink: 0;
  }

  .main {
    padding: 40px 24px;
  }

  .hero-grid,
  .step-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .hero h2 {
    font-size: 30px;
  }

  .hero p {
    font-size: 16px;
  }

  .hero-grid,
  .step-grid,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 24px 20px;
  }
}