:root {
  --ink: #14211d;
  --muted: #5b6b66;
  --bg: #f6f8f4;
  --card: #ffffff;
  --line: #dfe6e1;
  --accent: #1f7a5c;
  --accent-ink: #ffffff;
  --accent-soft: #e3f2ea;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--accent); }
img, svg { max-width: 100%; }

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

/* Header */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 800; font-size: 20px; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
.logo span { color: var(--accent); }
.nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
.nav a:hover { color: var(--ink); }

/* Hero */
.hero { padding: 40px 0 8px; }
.hero h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.1; margin: 0 0 12px; letter-spacing: -0.03em; }
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 680px; margin: 0; }

/* Calculator */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 28px 0 12px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; font-size: 15px; margin-bottom: 6px; }
.field .hint { display: block; font-size: 13px; color: var(--muted); margin-top: 4px; }
.input {
  width: 100%; font: inherit; font-size: 18px; padding: 12px 14px;
  border: 1.5px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink);
}
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.toggle { display: flex; align-items: center; gap: 10px; font-weight: 600; cursor: pointer; user-select: none; }
.toggle input { width: 22px; height: 22px; accent-color: var(--accent); }
details.more summary { cursor: pointer; color: var(--accent); font-weight: 600; margin: 4px 0 14px; }

.results h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 0 0 14px; }
.big { background: var(--accent); color: var(--accent-ink); border-radius: 14px; padding: 18px; margin-bottom: 12px; }
.big .label { font-size: 14px; opacity: 0.9; }
.big .value { font-size: 36px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; }
.big .sub { font-size: 14px; opacity: 0.9; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { background: var(--accent-soft); border-radius: 12px; padding: 12px 14px; }
.stat .label { font-size: 13px; color: var(--muted); }
.stat .value { font-size: 20px; font-weight: 700; }
.stat.wide { grid-column: 1 / -1; }

.chart-box { margin-top: 16px; }
.chart-box .caption { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
#chart { width: 100%; height: auto; display: block; }
#chart rect { fill: var(--accent); }
#chart rect:hover { fill: #155c45; }
#chart text { font-size: 11px; fill: var(--muted); }

.table-wrap { overflow-x: auto; margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; background: var(--card); }
th, td { padding: 9px 10px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { font-size: 13px; color: var(--muted); font-weight: 600; }
details.yearly { margin: 8px 0 0; }
details.yearly summary { cursor: pointer; font-weight: 600; color: var(--accent); padding: 8px 0; }

/* Sections */
section.block { padding: 44px 0 8px; }
section.block h2 { font-size: clamp(24px, 3.4vw, 32px); letter-spacing: -0.02em; margin: 0 0 18px; }
.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card h3 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); }
.card .example { margin-top: 12px; font-size: 14px; background: var(--bg); border-radius: 10px; padding: 10px 12px; color: var(--ink); }

.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 20px 20px 64px; position: relative; }
.steps li::before {
  counter-increment: s; content: counter(s); position: absolute; left: 18px; top: 18px;
  width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff;
  display: grid; place-items: center; font-weight: 800;
}
.steps strong { display: block; margin-bottom: 4px; }
.steps span { color: var(--muted); }

.perks { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; list-style: none; padding: 0; margin: 0; }
.perks li { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.perks strong { display: block; }
.perks span { color: var(--muted); font-size: 15px; }

.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px 16px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
.faq p { margin: 0 0 14px; color: var(--muted); }

.cta { text-align: center; background: var(--accent-soft); border-radius: var(--radius); padding: 32px 20px; margin: 44px 0 0; }
.cta h2 { margin: 0 0 8px; }
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 700; padding: 14px 26px; border-radius: 999px; margin-top: 10px; }
.btn:hover { background: #155c45; }

/* Plain pages */
.page { max-width: 760px; padding: 36px 20px 20px; margin: 0 auto; }
.page h1 { font-size: 34px; letter-spacing: -0.02em; margin: 0 0 6px; }
.page .updated { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.page h2 { font-size: 21px; margin: 28px 0 8px; }

/* Footer */
.site-footer { margin-top: 56px; border-top: 1px solid var(--line); background: var(--card); padding: 28px 0; font-size: 14px; color: var(--muted); }
.site-footer .links a { color: var(--muted); margin-right: 16px; text-decoration: none; }
.site-footer .links a:hover { color: var(--ink); }
.site-footer p { margin: 12px 0 0; max-width: 760px; }

@media (max-width: 860px) {
  .calc { grid-template-columns: 1fr; }
  .cards3, .steps { grid-template-columns: 1fr; }
  .perks { grid-template-columns: 1fr; }
  .nav a { margin-left: 12px; }
}
@media (max-width: 420px) {
  .row2 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .big .value { font-size: 30px; }
  .nav { display: none; }
}