:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef3f8;
  --text: #162033;
  --muted: #5c687b;
  --line: #dce3ec;
  --accent: #0f6f78;
  --accent-dark: #0a5057;
  --accent-soft: #dff1f2;
  --warm: #b86b3d;
  --shadow: 0 18px 45px rgba(28, 42, 66, 0.10);
  --radius: 20px;
  --radius-sm: 12px;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

.container { width: min(calc(100% - 36px), var(--max)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246,248,251,.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(220,227,236,.9);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  color: white;
  background: linear-gradient(145deg, var(--accent), #174d75);
  font-weight: 900;
  letter-spacing: -0.06em;
}

.nav-links { display: flex; align-items: center; gap: 24px; font-size: .96rem; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 650; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }

.menu-button { display: none; }

.hero { padding: 86px 0 72px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, .82fr);
  gap: 64px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent-dark);
  margin-bottom: 18px;
}

.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--accent); }

h1, h2, h3 { line-height: 1.12; letter-spacing: -0.035em; margin-top: 0; }
h1 { font-size: clamp(3rem, 7vw, 6.15rem); max-width: 10.5ch; margin-bottom: 24px; }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); margin-bottom: 18px; }
h3 { font-size: 1.28rem; margin-bottom: 10px; }

.lede { font-size: clamp(1.1rem, 2vw, 1.35rem); color: var(--muted); max-width: 62ch; }
.hero-copy .lede { max-width: 55ch; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: white;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.button:hover { color: white; background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 10px 25px rgba(15,111,120,.18); }
.button.secondary { background: transparent; color: var(--accent-dark); border-color: var(--line); }
.button.secondary:hover { background: var(--surface); color: var(--text); }

.hero-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero-panel .panel-label { color: var(--muted); font-size: .87rem; font-weight: 750; }
.hero-panel ol { margin: 18px 0 0; padding: 0; list-style: none; counter-reset: step; }
.hero-panel li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 13px;
  align-items: start;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}
.hero-panel li::before {
  content: counter(step);
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-dark); font-weight: 850;
}
.hero-panel li strong { display: block; margin-bottom: 2px; }
.hero-panel li span { color: var(--muted); font-size: .94rem; }

.section { padding: 78px 0; }
.section.white { background: var(--surface); }
.section-head { max-width: 760px; margin-bottom: 38px; }
.section-head p { color: var(--muted); font-size: 1.08rem; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.card.soft { background: var(--surface-soft); }
.card p { color: var(--muted); margin-bottom: 0; }
.card .kicker { color: var(--warm); font-weight: 800; font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 10px; }

.subjects { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.subject-group {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.subject-group ul { list-style: none; padding: 0; margin: 18px 0 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.subject-group li { padding: 10px 12px; border-radius: 10px; background: var(--surface-soft); font-weight: 700; color: #33405a; }

.callout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 34px;
  border: 1px solid #bcd9db;
  background: var(--accent-soft);
  border-radius: 24px;
}
.callout p { color: #34535a; max-width: 60ch; margin-bottom: 0; }

.page-hero { padding: 66px 0 38px; }
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 5.1rem); max-width: 13ch; }

.prose { max-width: 850px; }
.prose h2 { margin-top: 52px; font-size: clamp(1.8rem, 3vw, 2.65rem); }
.prose h3 { margin-top: 32px; }
.prose p, .prose li { color: #39465b; font-size: 1.05rem; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose .evidence {
  margin: 28px 0;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.reference-list { font-size: .93rem; }
.reference-list li { margin-bottom: 10px; }

.tool-wrap {
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(360px, 1.2fr);
  gap: 28px;
  align-items: start;
}
.tool-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 12px 30px rgba(28,42,66,.06);
}
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 800; margin-bottom: 7px; }
.field small { display: block; color: var(--muted); margin-top: 6px; }
input, textarea, select {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 11px;
  background: white;
  color: var(--text);
  font: inherit;
  padding: 11px 12px;
}
textarea { min-height: 106px; resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 3px solid rgba(15,111,120,.14); border-color: var(--accent); }

.result-empty { color: var(--muted); padding: 24px 4px; }
.result-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 22px;
}
.metric { background: var(--surface-soft); padding: 16px; border-radius: 14px; }
.metric strong { display: block; font-size: 1.5rem; line-height: 1; margin-bottom: 6px; }
.metric span { color: var(--muted); font-size: .84rem; }
.schedule { display: grid; gap: 10px; }
.schedule-row {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 15px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 13px;
}
.schedule-row strong { color: var(--accent-dark); }
.schedule-row span { color: var(--muted); }
.privacy-note { font-size: .85rem; color: var(--muted); margin-top: 18px; }

.site-footer { padding: 38px 0 24px; border-top: 1px solid var(--line); }
.footer-grid { display: flex; justify-content: space-between; gap: 20px; align-items: end; }
.footer-copy { color: var(--muted); font-size: .9rem; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; font-size: .9rem; }
.build-marker { text-align: right; color: #9aa6b5; font-size: .69rem; letter-spacing: .07em; margin-top: 16px; }

@media (max-width: 850px) {
  .hero { padding-top: 56px; }
  .hero-grid, .tool-wrap, .subjects, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero-grid { gap: 34px; }
  h1 { max-width: 12ch; }
  .nav-links { display: none; position: absolute; left: 18px; right: 18px; top: 66px; background: var(--surface); border: 1px solid var(--line); border-radius: 15px; padding: 14px; box-shadow: var(--shadow); flex-direction: column; align-items: stretch; gap: 4px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 12px; }
  .menu-button { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--text); font-weight: 900; cursor: pointer; }
  .callout { grid-template-columns: 1fr; }
  .result-summary { grid-template-columns: 1fr 1fr; }
  .footer-grid { align-items: flex-start; flex-direction: column; }
  .build-marker { text-align: left; }
}

@media (max-width: 520px) {
  .container { width: min(calc(100% - 24px), var(--max)); }
  .hero, .section { padding-top: 54px; padding-bottom: 54px; }
  .hero-panel, .tool-card, .card, .subject-group { padding: 21px; }
  .subject-group ul { grid-template-columns: 1fr; }
  .result-summary { grid-template-columns: 1fr; }
  .schedule-row { grid-template-columns: 1fr; gap: 3px; }
  .actions { flex-direction: column; align-items: stretch; }
  .button { width: 100%; }
}