/* Hallmark-inspired · genre: editorial · macrostructure: Masthead-Ledger
   paper: light warm · display: serif (Gowun Batang) · body: sans (Pretendard)
   accent: single warm rust hue, <5% of palette · asymmetric bias, no centered-everything */

@import url('https://fonts.googleapis.com/css2?family=Gowun+Batang:wght@400;700&display=swap');
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.css');

:root {
  --color-paper: oklch(97.5% 0.012 80);
  --color-paper-2: oklch(94% 0.014 75);
  --color-ink: oklch(22% 0.02 60);
  --color-ink-soft: oklch(42% 0.02 60);
  --color-accent: oklch(56% 0.16 40);
  --color-accent-soft: oklch(90% 0.05 45);
  --color-line: oklch(85% 0.015 70);

  --font-display: 'Gowun Batang', serif;
  --font-body: 'Pretendard', -apple-system, sans-serif;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 32px;
  --space-xl: 64px;
  --space-2xl: 96px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

* { box-sizing: border-box; }
html { overflow-x: clip; }
body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: clip;
}

h1, h2, h3, .display {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
}

a { color: inherit; }

.accent { color: var(--color-accent); }
.underline-accent {
  background-image: linear-gradient(var(--color-accent-soft), var(--color-accent-soft));
  background-repeat: no-repeat;
  background-size: 100% 0.3em;
  background-position: 0 88%;
  padding: 0 0.05em;
}

/* ---------- Simple top bar (tool-site header, not a journal masthead) ---------- */
.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-line);
  flex-wrap: wrap;
}
.topbar a.wordmark {
  font-family: var(--font-display);
  font-size: 26px;
  text-decoration: none;
  color: var(--color-ink);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.topbar a.wordmark img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}
.topbar .tagline {
  color: var(--color-ink-soft);
  font-size: 13px;
}

/* ---------- Hero (short, one line, not a magazine spread) ---------- */
.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero h1 {
  font-size: clamp(22px, 3vw, 30px);
  font-family: var(--font-body);
  font-weight: 700;
}

.hero .search {
  min-width: 220px;
  flex: 0 0 260px;
  padding: 11px 14px;
  border: 1px solid var(--color-line);
  background: var(--color-paper-2);
  font-family: var(--font-body);
  font-size: 14px;
}
.hero .search:focus-visible { outline: 2px solid var(--color-accent); }

/* ---------- Calculator ledger grid (asymmetric, not icon-tiles) ---------- */
.ledger {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-2xl);
}

.ledger h2 {
  font-size: 26px;
  margin-bottom: var(--space-lg);
}

.ledger-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-auto-rows: minmax(0, auto);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.ledger-item {
  background: var(--color-paper);
  padding: var(--space-lg) var(--space-md);
  text-decoration: none;
  color: var(--color-ink);
  grid-column: span 2;
  transition: background 0.2s var(--ease-out);
  min-width: 0;
}
.ledger-item:hover { background: var(--color-paper-2); }
.ledger-item.wide { grid-column: span 3; }
.ledger-item.lead {
  grid-column: span 6;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-xl) var(--space-md);
}
.ledger-item.lead .num-badge {
  font-family: var(--font-display);
  font-size: 64px;
  color: var(--color-accent-soft);
  line-height: 1;
}

.ledger-item .index {
  font-size: 12px;
  color: var(--color-ink-soft);
  letter-spacing: 0.08em;
}
.ledger-item .name {
  font-family: var(--font-display);
  font-size: 20px;
  margin-top: 6px;
  overflow-wrap: anywhere;
  min-width: 0;
}
.ledger-item .desc {
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-ink-soft);
}
.ledger-item .cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: var(--space-md);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
}
.ledger-item .cta .arrow {
  transition: transform 0.2s var(--ease-out);
}
.ledger-item:hover .cta .arrow { transform: translateX(4px); }
.ledger-item .formula {
  margin-top: var(--space-sm);
  font-size: 11px;
  color: var(--color-ink-soft);
  opacity: 0.7;
  font-family: 'SFMono-Regular', Consolas, monospace;
}
.badge-soon {
  display: inline-block;
  margin-top: var(--space-sm);
  font-size: 11px;
  color: var(--color-ink-soft);
  border: 1px solid var(--color-line);
  padding: 2px 8px;
  border-radius: 2px;
}

@media (max-width: 900px) {
  .ledger-grid { grid-template-columns: repeat(2, 1fr); }
  .ledger-item, .ledger-item.wide { grid-column: span 2; }
  .ledger-item.lead { grid-template-columns: 1fr; text-align: left; }
}

/* ---------- More-info disclosure (keeps SEO content out of the way of the one-shot user) ---------- */
details.more-info {
  margin-top: var(--space-xl);
  border-top: 3px double var(--color-line);
  padding-top: var(--space-lg);
}
details.more-info > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 18px;
}
details.more-info > summary::-webkit-details-marker { display: none; }
details.more-info > summary:before {
  content: '▸';
  color: var(--color-accent);
  transition: transform 0.2s var(--ease-out);
}
details.more-info[open] > summary:before { transform: rotate(90deg); }
details.more-info > summary .hint {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--color-ink-soft);
}
details.more-info .toc { margin-top: var(--space-lg); }

/* ---------- Flat tool grid: every calculator gets equal weight, no category tabs ---------- */
.tool-grid-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-2xl);
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}
@media (max-width: 900px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .tool-grid { grid-template-columns: 1fr; }
}
.tool-card {
  background: var(--color-paper);
  padding: var(--space-lg) var(--space-md);
  text-decoration: none;
  color: var(--color-ink);
  min-width: 0;
  transition: background 0.2s var(--ease-out);
  display: flex;
  flex-direction: column;
  min-height: 168px;
}
.tool-card:hover { background: var(--color-paper-2); }
.tool-card .tag {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.04em;
}
.tool-card .name {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 18px;
  margin-top: 6px;
}
.tool-card .desc {
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-ink-soft);
  flex: 1;
}
.tool-card .cta {
  margin-top: var(--space-sm);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.tool-card .cta .arrow { transition: transform 0.2s var(--ease-out); }
.tool-card:hover .cta .arrow { transform: translateX(4px); }
.tool-card.disabled .cta { color: var(--color-ink-soft); }

.note-line {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-xl);
  font-size: 13px;
  color: var(--color-ink-soft);
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-md);
}

/* ---------- Footer ---------- */
footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-ink-soft);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* ==================== Calculator detail page ==================== */
.calc-header {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
}
.calc-header .breadcrumb {
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-md);
}
.calc-header .breadcrumb a { text-decoration: none; border-bottom: 1px solid var(--color-line); }
.calc-header h1 {
  font-size: clamp(28px, 4vw, 40px);
}
.calc-header .sub {
  margin-top: var(--space-sm);
  color: var(--color-ink-soft);
  font-size: 16px;
}

.calc-body {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-2xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.calc-form {
  background: var(--color-paper-2);
  border: 1px solid var(--color-line);
  padding: var(--space-lg);
}
.calc-form .field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}
@media (max-width: 560px) {
  .calc-form .field-row { grid-template-columns: 1fr; }
}
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-ink-soft);
}
.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-line);
  background: var(--color-paper);
  font-size: 16px;
  font-family: var(--font-body);
  color: var(--color-ink);
}
.field input:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.btn-calc {
  margin-top: var(--space-sm);
  background: var(--color-ink);
  color: var(--color-paper);
  border: none;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background 0.2s var(--ease-out), transform 0.15s var(--ease-out);
}
.btn-calc:hover { background: var(--color-accent); }
.btn-calc:active { transform: translateY(1px); }
.btn-calc:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.btn-calc:disabled { opacity: 0.5; cursor: not-allowed; }

.result-panel {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px dashed var(--color-line);
  display: none;
}
.result-panel.show { display: block; }
.result-headline {
  font-family: var(--font-display);
  font-size: 34px;
  color: var(--color-accent);
}
.result-headline .unit { font-size: 18px; color: var(--color-ink); font-family: var(--font-body); }
.result-grid {
  margin-top: var(--space-md);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm) var(--space-lg);
  font-size: 14px;
}
.result-grid .k { color: var(--color-ink-soft); }
.result-grid .v { font-weight: 600; text-align: right; }
.result-basis {
  margin-top: var(--space-md);
  font-size: 12px;
  color: var(--color-ink-soft);
  background: var(--color-paper);
  border-left: 2px solid var(--color-accent);
  padding: var(--space-sm) var(--space-md);
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  font-size: 13px;
  padding: var(--space-md);
  border: 1px solid var(--color-line);
  background: var(--color-paper-2);
}
.toc a { text-decoration: none; color: var(--color-ink-soft); }
.toc a:hover { color: var(--color-accent); }

.content-section h2 {
  font-size: 22px;
  margin-bottom: var(--space-sm);
  scroll-margin-top: var(--space-lg);
}
.content-section h2 .no {
  color: var(--color-accent-soft);
  font-family: var(--font-body);
  font-weight: 700;
  margin-right: var(--space-sm);
}
.content-section p { color: var(--color-ink-soft); }
.content-section ul { color: var(--color-ink-soft); padding-left: 1.2em; }
.content-section li { margin-bottom: 6px; }

.basis-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.basis-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-line);
}
.basis-list li:before { content: '· '; color: var(--color-accent); }

details.faq {
  border-bottom: 1px solid var(--color-line);
  padding: var(--space-sm) 0;
}
details.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary:after { content: '+'; color: var(--color-accent); font-size: 18px; }
details.faq[open] summary:after { content: '−'; }
details.faq p { margin-top: var(--space-sm); color: var(--color-ink-soft); }

.related-tools {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.related-tools a {
  border: 1px solid var(--color-line);
  padding: 8px 14px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
}
.related-tools a:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ---------- Ad slots (pre-wired placeholders, empty until AdSense approval) ---------- */
.ad-slot {
  max-width: 1180px;
  margin: var(--space-lg) auto;
  padding: var(--space-sm);
  border: 1px dashed var(--color-line);
  background: var(--color-paper-2);
  color: var(--color-ink-soft);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ad-slot.leaderboard { min-height: 90px; }
.ad-slot.rectangle { min-height: 250px; max-width: 300px; }
.ad-slot.inline { min-height: 100px; margin: var(--space-lg) 0; max-width: none; }
@media (max-width: 720px) {
  .ad-slot.leaderboard { min-height: 60px; }
}

.lotto-balls {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}
.lotto-ball {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--color-paper);
  background: var(--color-ink-soft);
}
.lotto-ball.r1 { background: oklch(70% 0.18 60); }
.lotto-ball.r2 { background: oklch(65% 0.15 230); }
.lotto-ball.r3 { background: oklch(55% 0.02 60); }
.lotto-ball.r4 { background: oklch(60% 0.16 145); }
.lotto-ball.r5 { background: var(--color-accent); }

.disclaimer {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-line);
  font-size: 12px;
  color: var(--color-ink-soft);
}