:root {
  --bg: #0E1116;
  --card: #171B22;
  --card-hi: #1D232C;
  --line: #262D38;
  --text: #F2F4F7;
  --muted: #8D96A5;
  --accent: #FFB020;
  --accent-ink: #1A1000;
  --radius: 18px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #FFFBF3; --card: #FFFFFF; --card-hi: #FEF3E2; --line: #F0E0C8;
    --text: #201A0E; --muted: #6B5F4C; --accent: #B45309; --accent-ink: #FFFFFF;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #FFFBF3; --card: #FFFFFF; --card-hi: #FEF3E2; --line: #F0E0C8;
  --text: #201A0E; --muted: #6B5F4C; --accent: #B45309; --accent-ink: #FFFFFF;
  color-scheme: light;
}
* { box-sizing: border-box; }
/* 라이트/다크 전환이 뚝 끊기지 않고 부드럽게 이어지도록. prefers-reduced-motion에서는 아래 미디어쿼리가 다시 꺼준다. */
*, *::before, *::after { transition: background-color .2s ease, border-color .2s ease, color .2s ease; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  padding: env(safe-area-inset-top) max(20px, calc((100% - 480px) / 2)) env(safe-area-inset-bottom);
  background: var(--bg) radial-gradient(60% 260px at 50% -40px, rgba(198, 244, 50, .16), transparent 72%) no-repeat;
  color: var(--text);
  word-break: keep-all;
  overflow-wrap: break-word;
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", system-ui, sans-serif;
}
a { color: var(--accent); }
h1 { margin: 0; font-size: 30px; line-height: 1.25; letter-spacing: -.03em; }
h2 { margin: 28px 0 8px; font-size: 18px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.crumb { margin: 14px 0 0; font-size: 13px; }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { color: var(--accent); }
.lang-switch { position: relative; display: inline-block; margin: 8px 0 0; }
.lang-toggle {
  height: 30px; padding: 0 12px; border: 1px solid var(--line); border-radius: 99px;
  background: var(--card); color: var(--muted); font: inherit; font-size: 12px; font-weight: 600; cursor: pointer;
  transition: border-color .2s, color .2s;
}
.lang-toggle:hover, .lang-toggle[aria-expanded="true"] { border-color: var(--accent); color: var(--text); }
.lang-menu[hidden] { display: none; }
.lang-menu {
  position: absolute; top: calc(100% + 6px); left: 0; z-index: 15;
  margin: 0; padding: 6px; list-style: none; min-width: 120px;
  border: 1px solid var(--line); border-radius: 14px; background: var(--card);
  box-shadow: 0 12px 32px -12px rgba(0, 0, 0, .5);
}
.lang-menu li + li { margin-top: 2px; }
.lang-menu a { display: block; padding: 8px 10px; border-radius: 10px; color: var(--text); font-size: 13px; text-decoration: none; }
.lang-menu a:hover, .lang-menu a:focus-visible { background: var(--card-hi); }
.lang-menu a[aria-current="page"] { color: var(--accent); font-weight: 700; }
.theme-toggle {
  position: fixed; z-index: 20; top: calc(14px + env(safe-area-inset-top, 0px)); right: max(14px, calc((100% - 480px) / 2 + 14px));
  width: 38px; height: 38px; margin: 0; padding: 0; max-width: none; border: 1px solid var(--line); border-radius: 50%;
  background: var(--card); font-size: 16px; line-height: 1; cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 16px -6px rgba(0, 0, 0, .4);
}
.theme-toggle:hover { border-color: var(--accent); }

.hero { padding-top: 20px; padding-bottom: 20px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 14px; font-size: 13px; font-weight: 600; color: var(--muted); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.accent { color: var(--accent); }
.lead { margin: 10px 0 0; color: var(--muted); text-wrap: balance; }

.input-row { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; margin-bottom: 16px; }
.input-row label { font-size: 13px; font-weight: 700; color: var(--muted); }
.usage-input { display: flex; align-items: center; gap: 8px; padding: 0 16px; height: 56px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
.usage-input input { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--text); font: inherit; font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; }
.usage-input input:focus { outline: 0; }
.usage-input input::-webkit-outer-spin-button, .usage-input input::-webkit-inner-spin-button { margin: 0; }
#usage-unit { color: var(--muted); font-weight: 700; }

.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; min-width: 0; gap: 6px; padding: 5px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); }
.seg button { height: 40px; min-width: 0; border: 0; border-radius: 12px; background: transparent; color: var(--muted); font: inherit; font-size: 13px; font-weight: 700; cursor: pointer; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; transition: background .2s, color .2s; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }

.result { padding: 20px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.result-total { margin: 0; text-align: center; font-variant-numeric: tabular-nums; }
.result-total strong { font-size: 40px; font-weight: 800; color: var(--accent); letter-spacing: -.02em; }
.hint { margin: 6px 0 0; color: var(--muted); font-size: 13px; text-align: center; }
.breakdown { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; margin: 18px 0 0; padding-top: 14px; border-top: 1px solid var(--line); font-size: 14px; }
.breakdown dt { color: var(--muted); }
.breakdown dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }

.chart[hidden] { display: none; }
.chart { display: flex; align-items: center; gap: 14px; margin-top: 12px; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.chart-legend { min-width: 0; }
.chart-title { margin: 0 0 6px; color: var(--muted); font-size: 11px; font-weight: 700; }
.chart-row { display: flex; align-items: baseline; gap: 8px; }
.chart-row strong { font-size: 17px; font-weight: 800; font-variant-numeric: tabular-nums; }
.chart-row em { font-style: normal; font-size: 12px; font-weight: 700; }
.chart-row em.up { color: #E08A3C; }
.chart-row em.down { color: #4C8AD1; }
.chart-svg { flex: none; width: 132px; height: 40px; margin-left: auto; }
.chart-svg polyline { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.chart-svg circle { fill: var(--accent); stroke: var(--card); stroke-width: 2; }

.disclaimer { margin: 14px 2px 0; color: var(--muted); font-size: 12px; line-height: 1.6; }

.rate-table { width: 100%; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
.rate-table th, .rate-table td { padding: 10px 8px; border-bottom: 1px solid var(--line); text-align: right; }
.rate-table th:first-child, .rate-table td:first-child { text-align: left; }
.rate-table th { color: var(--muted); font-size: 13px; font-weight: 600; }

.foot { padding-block: 32px 40px; color: var(--muted); font-size: 13px; }
.foot a { color: var(--muted); }
body > main:not(:has(.result)) { padding-block: 32px; }
body > main:not(:has(.result)) p { color: var(--muted); }

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

/* ── 오늘의 환율: 금색 강조 ── */
:root { --accent: #FACC15; }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) { --accent: #A16207; } }
:root[data-theme="light"] { --accent: #A16207; }

.rate-note { color: var(--muted); font-size: 12px; margin: 10px 0 14px; line-height: 1.6; }
.rate-head, .rate-row { display: grid; grid-template-columns: 1.4fr 1fr 0.9fr 0.9fr; gap: 8px; align-items: center; }
.rate-date { margin: 0 0 8px; color: var(--muted); font-size: 13px; font-weight: 600; }
.rate-date[hidden] { display: none; }
.rate-head { color: var(--muted); font-size: 12px; padding: 0 16px 6px; }
.rate-list { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.rate-item { min-width: 0; }
.rate-btn { all: unset; box-sizing: border-box; display: grid; grid-template-columns: 1.4fr 1fr 0.9fr 0.9fr; gap: 8px; align-items: center; width: 100%; padding: 14px 16px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); cursor: pointer; font-size: 14px; }
.rate-btn:hover, .rate-btn[aria-expanded="true"] { border-color: var(--accent); }
.rate-name { display: block; font-weight: 700; }
.rate-unit { display: block; color: var(--muted); font-size: 12px; }
.rate-base { font-weight: 800; font-variant-numeric: tabular-nums; }
.rate-num { font-variant-numeric: tabular-nums; color: var(--muted); }
.rate-chip { font-size: 11px; color: var(--muted); }

.rate-panel { margin-top: 8px; padding: 16px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--card); }
.rate-panel[hidden] { display: none; }
.chart-stage { position: relative; }
.chart-tip {
  position: absolute; top: 0; transform: translateX(-50%); z-index: 2; pointer-events: none;
  display: grid; gap: 2px; min-width: 112px; padding: 8px 10px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card-hi); box-shadow: 0 8px 20px -10px rgba(0, 0, 0, .5);
  font-size: 12px; text-align: center; font-variant-numeric: tabular-nums; white-space: nowrap;
}
.chart-tip[hidden] { display: none; }
.chart-tip strong { font-size: 12px; color: var(--muted); font-weight: 600; }
.chart-tip span { font-size: 14px; font-weight: 800; }
.chart-tip .tip-sub { font-size: 12px; font-weight: 700; color: var(--muted); }
.chart-tip .tip-sub.up { color: #EF4444; }
.chart-tip .tip-sub.down { color: #3B82F6; }
.chart-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.chart-title { margin: 0; font-size: 16px; font-weight: 800; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.seg button { all: unset; cursor: pointer; padding: 6px 12px; font-size: 13px; color: var(--muted); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); font-weight: 700; }
.chart-svg { width: 100%; height: 200px; display: block; margin-top: 10px; cursor: crosshair; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.chart-axis { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 12px; }
.stat { padding: 12px; border-radius: 12px; background: var(--card-hi); }
.stat-label { margin: 0; color: var(--muted); font-size: 12px; }
.stat-value { margin: 4px 0 0; font-size: 16px; font-weight: 800; font-variant-numeric: tabular-nums; }
.stat-value.up { color: #EF4444; }
.stat-value.down { color: #3B82F6; }
.chart-note { color: var(--muted); font-size: 12px; margin-top: 10px; line-height: 1.6; }
.trend-empty { color: var(--muted); font-size: 14px; padding: 18px 0; text-align: center; }
.next { margin-top: 24px; }
.pill-link { display: inline-flex; align-items: center; height: 40px; padding: 0 16px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--text); text-decoration: none; font-weight: 600; font-size: 14px; }
.pill-link:hover { border-color: var(--accent); }