:root {
  --bg: #f4f7f5;
  --ink: #10231c;
  --muted: #52615a;
  --card: #ffffff;
  --line: #e2ebe6;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --soft: #e7f6f2;
  --shadow: 0 18px 44px rgba(16, 35, 28, 0.07);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(820px 360px at 100% -8%, rgba(15, 118, 110, 0.12), transparent 55%),
    var(--bg);
  color: var(--ink);
  line-height: 1.5;
}
a { color: var(--accent-dark); }
.wrap { width: min(1040px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(244, 247, 245, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 750; letter-spacing: -0.03em; text-decoration: none; color: inherit; }
.brand-mark { width: 34px; height: 34px; border-radius: 10px; background: var(--ink); color: #d9f99d; display: grid; place-items: center; font-size: 0.72rem; font-weight: 800; }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--muted); font-size: 0.86rem; font-weight: 650; padding: 7px 10px; border-radius: 999px; }
.nav a.active, .nav a:hover { background: #fff; color: var(--ink); }

.hero { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 22px; padding: 32px 0 8px; align-items: start; }
.kicker { display: inline-block; background: var(--soft); color: var(--accent-dark); font-size: 0.78rem; font-weight: 750; padding: 5px 10px; border-radius: 999px; }
h1 { font-size: clamp(2rem, 4vw, 3.15rem); letter-spacing: -0.045em; line-height: 1.05; margin: 12px 0 8px; }
.lede { color: var(--muted); font-size: 1.05rem; max-width: 40rem; margin: 0 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); padding: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { margin-bottom: 12px; }
label { display: block; font-size: 0.78rem; font-weight: 750; margin-bottom: 6px; }
input, select {
  width: 100%; border: 1px solid var(--line); background: #fff;
  border-radius: 12px; padding: 12px; font: inherit; color: inherit;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.chip {
  border: 1px solid var(--line); background: #fff; border-radius: 12px;
  padding: 8px 10px; font: inherit; font-size: 0.86rem; font-weight: 700;
  cursor: pointer; text-align: left; color: inherit;
}
.chip span { display: block; font-weight: 550; color: var(--muted); font-size: 0.75rem; }
.chip.is-on { border-color: var(--accent); background: var(--soft); color: var(--accent-dark); }
.hint { color: var(--muted); font-size: 0.84rem; margin: 0; }

.result { background: var(--ink); color: #fff; border: 0; min-height: 100%; }
.result h2 { margin: 0 0 6px; font-size: 0.95rem; font-weight: 650; color: #d9f99d; }
.result .pay { font-size: clamp(2.4rem, 5vw, 3.2rem); letter-spacing: -0.05em; font-weight: 760; line-height: 1; }
.result .unit { color: #c9d4ce; font-size: 0.92rem; margin: 6px 0 16px; }
.stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { background: rgba(255,255,255,0.06); border-radius: 12px; padding: 10px 12px; }
.stat b { display: block; font-size: 1.25rem; letter-spacing: -0.03em; }
.stat span { color: #c9d4ce; font-size: 0.78rem; }
.note { color: #c9d4ce; font-size: 0.84rem; margin: 14px 0 0; }

.section { padding: 22px 0; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.guide-card { display: block; text-decoration: none; color: inherit; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.guide-card strong { display: block; margin-bottom: 4px; }
.guide-card span { color: var(--muted); font-size: 0.88rem; }
.prose { max-width: 740px; }
.prose p, .prose li { color: var(--muted); }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 14px; overflow: hidden; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { font-size: 0.78rem; color: var(--muted); }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin-bottom: 8px; }
.faq summary { cursor: pointer; font-weight: 700; }
.site-footer { border-top: 1px solid var(--line); padding: 22px 0 36px; color: var(--muted); font-size: 0.86rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 8px; }
.footer-links a { color: var(--muted); }

@media (max-width: 860px) {
  .hero, .cards, .grid-2, .stat-row { grid-template-columns: 1fr; }
}