:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1b1f2a;
  --muted: #5d6474;
  --line: #e4e2dc;
  --accent: #c8402c;      /* vermilion */
  --accent-ink: #ffffff;
  --navy: #1f2a44;
  --warn-bg: #fff4e5;
  --warn: #8a4b00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141a;
    --surface: #1b1e27;
    --text: #eceef3;
    --muted: #a0a7b6;
    --line: #2d3240;
    --accent: #ef6a55;
    --accent-ink: #160806;
    --navy: #0c1120;
    --warn-bg: #3a2a12;
    --warn: #ffcf8a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
}
a { color: var(--accent); }
main { max-width: 820px; margin: 0 auto; padding: 24px 16px 56px; }
h1 { font-size: 1.75rem; line-height: 1.3; margin: 0 0 12px; }
h2 { font-size: 1.25rem; margin: 32px 0 10px; }
h3 { font-size: 1.05rem; margin: 22px 0 6px; }

.disclosure {
  margin: 0; padding: 6px 16px; font-size: .78rem; text-align: center;
  background: var(--surface); color: var(--muted); border-bottom: 1px solid var(--line);
}
.site-header { background: var(--navy); }
.site-header .inner {
  max-width: 820px; margin: 0 auto; padding: 14px 16px;
  display: flex; flex-wrap: wrap; gap: 8px 16px; justify-content: space-between; align-items: center;
}
.logo { color: #fff; font-weight: 800; font-size: 1.2rem; text-decoration: none; letter-spacing: .01em; }
.logo span { color: #ff8f7c; }
.site-header nav a { color: #e6e9f2; text-decoration: none; margin-left: 14px; font-size: .92rem; }
.site-header nav a:first-child { margin-left: 0; }

.hero { padding: 12px 0 4px; }
.hero p { color: var(--muted); margin-top: 0; }

.btn {
  display: inline-block; padding: 11px 20px; border: 0; border-radius: 8px;
  background: var(--accent); color: var(--accent-ink); font-weight: 700; text-decoration: none; cursor: pointer; font-size: 1rem;
}
.btn.small { padding: 8px 14px; font-size: .88rem; white-space: nowrap; }

.calc {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin: 18px 0;
}
.calc-form { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .calc-form { grid-template-columns: 1fr 1.4fr; } }
.calc-form label { display: grid; gap: 6px; font-weight: 600; font-size: .95rem; }
.calc-form select, .calc-form input[type=number] {
  font: inherit; padding: 10px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg); color: var(--text);
}
.checks { display: flex; flex-wrap: wrap; gap: 8px 18px; grid-column: 1 / -1; }
.checks label { display: flex; gap: 8px; align-items: center; font-weight: 500; }
.calc-summary { color: var(--muted); font-size: .9rem; margin: 16px 0 8px; }

.result-row {
  display: flex; align-items: center; gap: 12px; padding: 12px; margin-bottom: 10px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
}
.rank { font-size: 1.3rem; font-weight: 800; color: var(--accent); width: 26px; text-align: center; }
.info { flex: 1; min-width: 0; }
.plan { color: var(--muted); font-size: .9rem; }
.price { font-size: 1.15rem; font-weight: 800; }
.price small { font-weight: 400; color: var(--muted); }
.meta { font-size: .78rem; color: var(--muted); }
.badges { margin-top: 4px; display: flex; gap: 6px; flex-wrap: wrap; }
.badge { font-size: .72rem; padding: 1px 8px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); }
.badge.warn { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
.callout { margin-top: 14px; padding: 12px 14px; border-left: 4px solid var(--accent); background: var(--bg); font-size: .92rem; }
.empty { color: var(--muted); }
.note { font-size: .82rem; color: var(--muted); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
thead th { background: var(--surface); }

.cards { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cards { grid-template-columns: repeat(2, 1fr); } }
.card {
  display: block; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px;
  color: var(--text); text-decoration: none;
}
.card strong { display: block; margin-bottom: 4px; }
.card span { color: var(--muted); font-size: .9rem; }

.log { list-style: none; padding: 0; }
.log li { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.log time { font-size: .8rem; color: var(--muted); }

.site-footer { border-top: 1px solid var(--line); padding: 22px 16px; text-align: center; font-size: .82rem; color: var(--muted); }
.site-footer nav a { margin: 0 8px; }

/* phone layout */
.calc-form label { min-width: 0; }
.calc-form select, .calc-form input[type=number] { width: 100%; min-width: 0; }
@media (max-width: 520px) {
  .result-row { flex-wrap: wrap; }
  .result-row .btn { width: 100%; text-align: center; }
  .site-header nav a { margin-left: 0; margin-right: 14px; }
}