:root {
  --bg: #fafaf9;
  --card: #ffffff;
  --ink: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --accent: #0d9488;
  --accent-dark: #0f766e;
  --accent-soft: #f0fdfa;
  --gold: #b45309;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 800; font-size: 1.1rem; color: var(--ink); text-decoration: none; }
.brand:hover { color: var(--accent-dark); }
.nav { display: flex; gap: 4px; align-items: center; }
.nav a, .nav .soon {
  color: var(--muted); text-decoration: none; font-size: .92rem; font-weight: 600;
  padding: 8px 12px; border-radius: 8px;
}
.nav span.soon { cursor: default; }
.nav a:hover { color: var(--ink); background: #f5f5f4; }
.nav a.active { color: var(--accent-dark); background: var(--accent-soft); }
.nav .soon span {
  font-size: .68rem; font-weight: 700; background: #f5f5f4; color: var(--muted);
  padding: 2px 6px; border-radius: 20px; margin-left: 4px; vertical-align: 1px;
}

/* hero */
.hero { padding: 44px 20px 8px; text-align: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -0.02em; margin: 0 0 12px; }
.lede { font-size: 1.15rem; color: #44403c; max-width: 720px; margin: 0 auto 14px; }
.privacy-note {
  display: inline-block; font-size: .9rem; color: var(--accent-dark);
  background: var(--accent-soft); border: 1px solid #ccfbf1;
  padding: 8px 16px; border-radius: 999px; margin: 0;
}

/* cards & grid */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px; margin: 22px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.card h2 { margin: 0 0 6px; font-size: 1.35rem; letter-spacing: -0.01em; }
.muted { color: var(--muted); font-size: .95rem; }

.calc-grid { display: grid; grid-template-columns: 1fr; gap: 0 22px; align-items: start; }
@media (min-width: 900px) {
  .calc-grid { grid-template-columns: 380px 1fr; }
  .results-col { position: sticky; top: 84px; }
}

/* form */
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 650; font-size: .92rem; margin-bottom: 6px; }
.field .hint { color: var(--muted); font-weight: 500; }
.field-help { font-size: .82rem; color: var(--muted); margin: 5px 0 0; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
input[type="number"] {
  width: 100%; font-size: 1.05rem; padding: 11px 13px;
  border: 1.5px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
  transition: border-color .15s;
}
input[type="number"]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px #ccfbf1; }
input[type="number"]::-webkit-inner-spin-button { opacity: 1; }

.btn-secondary {
  width: 100%; padding: 11px; border-radius: 10px; cursor: pointer;
  border: 1.5px solid var(--line); background: #fff; font-weight: 650; font-size: .95rem; color: var(--ink);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-dark); }
.share-msg { color: var(--accent-dark); font-size: .9rem; font-weight: 600; margin: 8px 0 0; text-align: center; }

/* results */
.verdict-card { text-align: center; border-top: 4px solid var(--accent); }
.verdict-label { text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; font-weight: 700; color: var(--muted); margin: 0 0 6px; }
.coast-number { font-size: clamp(2.4rem, 6vw, 3.4rem); font-weight: 800; letter-spacing: -0.02em; margin: 0; color: var(--accent-dark); }
.verdict { font-size: 1.05rem; font-weight: 600; margin: 10px 0 0; }
.verdict.yes { color: var(--accent-dark); }
.verdict.no { color: var(--gold); }
.progress-wrap { margin-top: 18px; }
.progress-bar { height: 10px; background: #f5f5f4; border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), #14b8a6); border-radius: 999px; transition: width .5s ease; }
.progress-text { font-size: .88rem; color: var(--muted); margin: 8px 0 0; }

.stats-card { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; padding: 0; overflow: hidden; }
.stat { padding: 18px 22px; background: #fff; }
.stat:nth-child(odd) { border-right: 1px solid var(--line); }
.stat:not(:nth-last-child(-n+2)) { border-bottom: 1px solid var(--line); }
.stat-label { display: block; font-size: .8rem; color: var(--muted); font-weight: 600; margin-bottom: 4px; }
.stat-value { font-size: 1.35rem; font-weight: 750; letter-spacing: -0.01em; }

/* chart */
.chart-wrap { position: relative; margin-top: 12px; }
#chart { width: 100%; display: block; }
.legend { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 12px; font-size: .88rem; color: var(--muted); }
.swatch { display: inline-block; width: 22px; height: 4px; border-radius: 2px; margin-right: 7px; vertical-align: middle; }
.swatch.coast { background: var(--accent); }
.swatch.saving { background: #a8a29e; }
.swatch.target { background: transparent; border-top: 2px dashed var(--gold); height: 0; width: 22px; }

/* scenarios */
.scenario-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-top: 14px; }
.scenario { border: 1.5px solid var(--line); border-radius: 12px; padding: 16px; text-align: center; }
.scenario.hl { border-color: var(--accent); background: var(--accent-soft); }
.scenario-rate { font-weight: 800; font-size: 1.1rem; color: var(--accent-dark); }
.scenario-num { font-size: 1.5rem; font-weight: 800; margin: 6px 0 2px; letter-spacing: -0.01em; }
.scenario-note { font-size: .8rem; color: var(--muted); margin: 0; }

/* table */
.table-wrap { overflow-x: auto; margin-top: 12px; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: right; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
thead th { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
tbody tr:hover { background: var(--accent-soft); }
tbody tr.current-age { background: #fef3c7; font-weight: 700; }
.table-empty { text-align: center; color: var(--muted); padding: 20px; }

/* content */
.content { max-width: 760px; }
.content h2 { font-size: 1.5rem; margin: 34px 0 10px; letter-spacing: -0.01em; }
.content h3 { font-size: 1.15rem; margin: 24px 0 8px; color: var(--ink); }
.content p, .content li { color: #44403c; }
.formula {
  font-size: 1.25rem; font-weight: 700; text-align: center;
  background: var(--accent-soft); border: 1px solid #ccfbf1;
  padding: 16px; border-radius: 12px; color: var(--accent-dark);
}
.sources-list { padding-left: 20px; margin: 12px 0; }
.sources-list li { margin-bottom: 10px; font-size: .92rem; }
.sources-list a { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 2px; }
.sources-list a:hover { color: var(--ink); }
.sources-note { font-size: .85rem; margin-top: 6px; }
.last-updated { font-size: .85rem; color: var(--muted); margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--line); font-weight: 500; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
details { border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; margin: 10px 0; background: #fff; }
summary { font-weight: 700; cursor: pointer; }
details p { margin: 10px 0 2px; }

/* footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 22px 0; background: #fff; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: .88rem; }

@media (max-width: 600px) {
  .card { padding: 20px; }
  .stats-card { grid-template-columns: 1fr; }
  .stat:nth-child(odd) { border-right: none; }
  .stat { border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: none; }
}