:root {
  /* Lichtbringer palette */
  --cream: #faf8f3;
  --beige: #eee8dc;
  --tan: #ddd5c7;
  --greige: #c9c4ba;
  --ink: #11110f;
  --ink-muted: #68645d;
  --gold: #b7ac8f;
  --dark: #101010;

  --bg: var(--cream);
  --text: var(--ink);
  --muted: var(--ink-muted);
  --border: #dcd6c9;
  --card: #ffffff;
  --primary: var(--ink);
  --primary-dark: #000000;
}

* { box-sizing: border-box; }

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", sans-serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.65;
}

main {
  flex: 1 0 auto;
}

h1, h2, h3 {
  font-family: "Noto Serif KR", serif;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--cream);
  border-bottom: 1px solid var(--border);
  padding: 28px 0 0;
}
.header-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px 20px;
}
.logo {
  font-family: "Noto Serif KR", serif;
  font-size: 26px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.logo span { color: var(--ink); }
.tagline {
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0.06em;
  margin: 2px 0 18px;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  flex-wrap: wrap;
}
.nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav a:hover { color: var(--gold); }

/* Hero */
.hero {
  text-align: center;
  padding: 64px 20px 24px;
}
.eyebrow {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 40px;
  margin: 0 0 14px;
  color: var(--ink);
}
.subtitle {
  color: var(--ink-muted);
  font-size: 16px;
  margin-bottom: 40px;
}

/* Tool grid (home page) */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 780px;
  margin: 0 auto 64px;
}
.tool-card {
  display: block;
  background: #fffdf9;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 28px 24px;
  text-align: left;
  text-decoration: none;
  color: var(--ink);
  transition: border-color .15s, background .15s, transform .15s;
  position: relative;
}
.tool-card:hover {
  border-color: var(--gold);
  background: var(--beige);
  transform: translateY(-2px);
}
.tool-card-disabled {
  opacity: 0.55;
  cursor: default;
}
.tool-card-disabled:hover {
  border-color: var(--border);
  background: #fffdf9;
  transform: none;
}
.tool-icon { font-size: 30px; display: block; margin-bottom: 12px; }
.tool-card h3 { margin: 0 0 6px; font-size: 17px; }
.tool-card p { margin: 0; color: var(--ink-muted); font-size: 13px; }
.tool-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 3px 8px;
}

/* Tool tabs (merge/split) */
.tool-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
}
.tool-tab {
  background: none;
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 10px 24px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  cursor: pointer;
}
.tool-tab.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

/* Merge file list */
.file-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}
.file-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 13px;
  background: #fffdf9;
}
.file-list-remove {
  background: none;
  border: none;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 13px;
  padding: 2px 6px;
}
.file-list-remove:hover { color: #8a3324; }

.range-input {
  display: block;
  width: 100%;
  max-width: 380px;
  margin: 0 auto 24px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: 14px;
  font-family: inherit;
  background: #fffdf9;
  color: var(--ink);
  text-align: center;
}

/* Drop zone */
.drop-zone {
  background: #fffdf9;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 48px 24px;
  transition: border-color .15s, background .15s;
}
.drop-zone.dragover {
  border-color: var(--gold);
  background: var(--beige);
}
.drop-icon { font-size: 38px; margin-bottom: 8px; opacity: 0.8; }
.hint { color: var(--ink-muted); font-size: 12px; margin-top: 12px; letter-spacing: 0.02em; }

.btn {
  display: inline-block;
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 12px 28px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, color .15s;
}
.btn-primary {
  background: var(--ink);
  color: var(--cream);
}
.btn-primary:hover { background: #000; }
.btn-large { padding: 14px 36px; font-size: 13px; }
.btn-text {
  background: none;
  border: none;
  color: var(--ink-muted);
  padding: 10px 16px;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
  font-size: 13px;
  border-bottom: 1px solid transparent;
}
.btn-text:hover { color: var(--ink); border-bottom-color: var(--ink); }

.hidden { display: none !important; }

.file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
  margin-bottom: 24px;
}
.file-icon { font-size: 26px; opacity: 0.75; }
.file-name { font-weight: 600; margin: 0; }
.file-size { color: var(--ink-muted); font-size: 13px; margin: 0; }
.preview-thumb {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--beige);
}
.option-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 4px;
}
.dimension-note {
  color: var(--ink-muted);
  font-size: 12px;
  margin: -14px 0 22px;
}

.quality-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 380px;
  margin: 0 auto 28px;
  text-align: left;
}
.quality-option {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 12px 14px;
  cursor: pointer;
  font-size: 14px;
  background: #fffdf9;
}
.quality-option:has(input:checked) {
  border-color: var(--ink);
  background: var(--beige);
}
.quality-option em { color: var(--ink-muted); font-style: normal; font-size: 12px; }

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--ink);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-icon { font-size: 34px; margin-bottom: 8px; }
.result-title {
  font-family: "Noto Serif KR", serif;
  font-weight: 500;
  font-size: 20px;
  margin-bottom: 22px;
}
.result-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.result-stats > div:not(.arrow):not(.ratio-badge) span {
  display: block;
  font-size: 20px;
  font-weight: 700;
}
.result-stats small {
  color: var(--ink-muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.arrow { color: var(--ink-muted); font-size: 20px; }
.ratio-badge {
  background: var(--ink);
  color: var(--cream);
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.05em;
}

.error-text { color: #8a3324; font-weight: 600; }

.ad-slot {
  margin: 32px auto 0;
  min-height: 0;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  padding: 0;
  width: calc(100% - 40px);
  max-width: 780px;
  margin: 0 auto;
}
.feature {
  background: var(--cream);
  padding: 28px 22px;
  text-align: center;
}
.feature h3 {
  margin: 0 0 10px;
  font-size: 15px;
  font-family: "Noto Sans KR", sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.feature p { margin: 0; color: var(--ink-muted); font-size: 13px; }

/* FAQ */
.faq { padding: 64px 20px 64px; max-width: 780px; margin: 0 auto; }
.faq h2 {
  text-align: left;
  margin-bottom: 24px;
  font-size: 13px;
  font-family: "Noto Sans KR", sans-serif;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}
.faq details {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 18px 0;
  margin-bottom: 0;
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 15px; }
.faq p { color: var(--ink-muted); margin: 12px 0 0; font-size: 14px; }

/* Static pages */
.page { padding: 56px 20px 72px; }
.page h1 { font-size: 32px; margin-bottom: 28px; }
.page h2 {
  font-size: 13px;
  font-family: "Noto Sans KR", sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-top: 36px;
}
.page p { color: var(--ink); }

/* Footer */
.site-footer {
  background: var(--dark);
  border-top: none;
  padding: 40px 0 28px;
  margin-top: 56px;
  color: var(--cream);
  flex-shrink: 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
  font-size: 12px;
  color: #9a968d;
  background: transparent;
}
.footer-links {
  background: transparent;
}
.footer-links a {
  color: #9a968d;
  text-decoration: none;
  margin-left: 20px;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: transparent;
}
.footer-links a:hover { color: var(--cream); }
.footer-brand {
  text-align: center;
  font-size: 11px;
  color: #6b675f;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 20px 20px 0;
  padding-top: 20px;
  border-top: 1px solid #262626;
}
.footer-brand a { color: #9a968d; text-decoration: none; border-bottom: 1px solid #4a4740; }
.footer-brand a:hover { color: var(--cream); }

/* Text diff */
.diff-input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 680px;
  margin: 0 auto 24px;
  text-align: left;
}
.diff-textarea {
  width: 100%;
  min-height: 180px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  background: #fffdf9;
  color: var(--ink);
  resize: vertical;
}
.diff-result {
  max-width: 680px;
  margin: 0 auto;
  text-align: left;
}
.diff-summary {
  color: var(--ink-muted);
  font-size: 13px;
  margin-bottom: 12px;
}
.diff-lines {
  border: 1px solid var(--border);
  border-radius: 2px;
  background: #fffdf9;
  max-height: 480px;
  overflow-y: auto;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
}
.diff-line {
  padding: 3px 12px;
  white-space: pre-wrap;
  word-break: break-word;
  border-bottom: 1px solid var(--border);
}
.diff-line:last-child { border-bottom: none; }
.diff-line-added { background: #e8f3e6; color: #2f5c2a; }
.diff-line-removed { background: #f6e7e2; color: #8a3324; }
.diff-line-same { color: var(--ink); }

/* Calculators */
.calc-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 520px;
  margin: 0 auto 24px;
  text-align: left;
}
.calc-field label {
  display: block;
  font-size: 12px;
  color: var(--ink-muted);
  margin-bottom: 6px;
}
.calc-field .range-input {
  margin: 0;
  max-width: none;
  text-align: left;
}
.calc-result {
  max-width: 520px;
  margin: 28px auto 0;
  text-align: left;
}
.calc-summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  background: var(--ink);
  color: var(--cream);
  border-radius: 4px;
  padding: 24px 26px;
  margin-bottom: 16px;
}
.calc-summary-main small,
.calc-summary-sub small {
  display: block;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #b7ac8f;
  margin-bottom: 6px;
}
.calc-summary-main strong { font-size: 30px; font-weight: 700; }
.calc-summary-sub span { font-size: 18px; font-weight: 600; }
.calc-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  background: #fffdf9;
  font-size: 13px;
}
.calc-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--beige);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.calc-table td {
  padding: 9px 14px;
  border-top: 1px solid var(--border);
}
.calc-table td:last-child { text-align: right; font-weight: 600; }
.calc-table-total td { border-top: 2px solid var(--ink); font-weight: 700; }

/* Signature pad */
.sign-canvas-wrap {
  max-width: 420px;
  margin: 0 auto 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
}
#sign-canvas { display: block; width: 100%; height: 180px; touch-action: none; cursor: crosshair; }
.sign-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 420px;
  margin: 0 auto 20px;
  text-align: left;
}
.sign-options label { display: block; font-size: 12px; color: var(--ink-muted); margin-bottom: 6px; }

/* OCR result */
.ocr-result-box {
  max-width: 620px;
  margin: 0 auto;
  text-align: left;
}
.ocr-textarea {
  width: 100%;
  min-height: 260px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: 14px;
  background: #fffdf9;
  color: var(--ink);
  resize: vertical;
}
.ocr-actions { display: flex; gap: 10px; margin-top: 12px; }
.lang-options {
  display: flex;
  justify-content: center;
  gap: 8px;
  max-width: 420px;
  margin: 0 auto 20px;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .features { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .nav { flex-wrap: wrap; gap: 16px; }
  .diff-input-grid { grid-template-columns: 1fr; }
  .calc-form { grid-template-columns: 1fr; }
  .sign-options { grid-template-columns: 1fr; }
}