:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #eef4f7;
  --text: #14212b;
  --muted: #667789;
  --brand: #064b55;
  --brand-2: #0d7280;
  --line: #dbe5ec;
  --warning: #8a4b00;
  --warning-bg: #fff4dd;
  --success: #17633a;
  --success-bg: #e8f7ef;
  --shadow: 0 22px 60px rgba(15, 37, 52, .10);
  --radius: 22px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #e7f7fb 0, transparent 36%), var(--bg);
  line-height: 1.6;
}
a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.site-header { padding: 22px 0; }
.nav { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.logo { display: flex; align-items: center; gap: 12px; font-weight: 800; color: var(--text); }
.logo-mark { width: 40px; height: 40px; border-radius: 14px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); display: grid; place-items: center; color: white; font-weight: 900; }
.nav-links { display: flex; gap: 22px; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-weight: 650; }
.hero { padding: 52px 0 28px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 34px; align-items: center; }
.kicker { color: var(--brand-2); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; font-size: .8rem; }
h1 { font-size: clamp(2.35rem, 5vw, 4.8rem); line-height: 1.01; letter-spacing: -0.06em; margin: 14px 0 18px; }
.lead { font-size: 1.18rem; color: var(--muted); max-width: 680px; }
.hero-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 26px; }
.hero-stat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 22px; }
.stat { background: var(--surface-2); border-radius: 18px; padding: 14px; }
.stat strong { display: block; font-size: 1.5rem; color: var(--brand); }
.main-tool { padding: 30px 0 64px; }
.tool-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(340px, .9fr); gap: 24px; align-items: start; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.card h2, .card h3 { margin-top: 0; line-height: 1.15; }
.tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.tab-btn, button, .btn { border: 0; border-radius: 999px; padding: 11px 16px; font-weight: 800; cursor: pointer; background: var(--surface-2); color: var(--text); }
.tab-btn.active, .btn-primary { background: var(--brand); color: white; }
textarea, input, select { width: 100%; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; font: inherit; color: var(--text); background: white; }
textarea { min-height: 320px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 750; margin-bottom: 6px; }
.help { font-size: .9rem; color: var(--muted); }
.hidden { display: none !important; }
.results-main { text-align: center; padding: 18px; border-radius: 20px; background: linear-gradient(135deg, #eef9fb, #ffffff); border: 1px solid var(--line); margin-bottom: 18px; }
.estimate-number { font-size: clamp(2.2rem, 5vw, 3.7rem); color: var(--brand); font-weight: 900; letter-spacing: -0.05em; line-height: 1; }
.breakdown { display: grid; gap: 10px; }
.breakdown-row { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.notice { padding: 12px 14px; border-radius: 16px; margin: 10px 0; }
.notice.warning { color: var(--warning); background: var(--warning-bg); }
.notice.success { color: var(--success); background: var(--success-bg); }
.accordion { border-top: 1px solid var(--line); margin-top: 18px; padding-top: 18px; }
.accordion summary { font-weight: 850; cursor: pointer; margin-bottom: 14px; }
.content-section { padding: 54px 0; }
.content-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.info-card { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: white; border-radius: 18px; overflow: hidden; }
th, td { text-align: left; padding: 14px; border-bottom: 1px solid var(--line); }
th { background: var(--surface-2); }
.compare-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.site-footer { padding: 38px 0; color: var(--muted); border-top: 1px solid var(--line); }
@media (max-width: 900px) {
  .hero-grid, .tool-grid, .content-grid, .compare-grid { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; }
  .hero-stat { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .form-grid { grid-template-columns: 1fr; }
  .container { width: min(100% - 22px, 1160px); }
  .card, .hero-card { padding: 18px; }
}