:root {
  --bg: #0E1116;
  --card: #171B22;
  --card-hi: #1D232C;
  --line: #262D38;
  --text: #F2F4F7;
  --muted: #8D96A5;
  --accent: #C6F432;
  --accent-ink: #0E1116;
  --radius: 18px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #F6F8F3; --card: #FFFFFF; --card-hi: #EEF3E4; --line: #DCE3D2;
    --text: #171B14; --muted: #5B6555; --accent: #5C8A28; --accent-ink: #FFFFFF;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #F6F8F3; --card: #FFFFFF; --card-hi: #EEF3E4; --line: #DCE3D2;
  --text: #171B14; --muted: #5B6555; --accent: #5C8A28; --accent-ink: #FFFFFF;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  padding: env(safe-area-inset-top) 0 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;
}
body > * { max-width: 480px; margin-inline: auto; padding-inline: 20px; }
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); }
.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; border: 1px solid var(--line); border-radius: 50%;
  background: var(--card); font-size: 16px; line-height: 1; cursor: pointer;
  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; 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; gap: 6px; padding: 5px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); }
.seg button { height: 40px; border: 0; border-radius: 12px; background: transparent; color: var(--muted); font: inherit; font-size: 13px; font-weight: 700; cursor: pointer; 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; }

.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: #C9CFD9; }

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