:root {
  --bg: #f6f1e7;
  --bg-alt: #eee5d1;
  --card: #fffdf8;
  --card-border: #e3d9c0;
  --ink: #2b2a24;
  --ink-muted: #6b6555;
  --green-950: #1f3329;
  --green-800: #2f4a3b;
  --green-600: #3f6b4f;
  --green-500: #4c7a5e;
  --green-300: #8fb59a;
  --green-100: #dbe8dd;
  --terracotta: #b1553d;
  --gold: #c8944e;
  --positive: #3f8a5c;
  --positive-bg: #e3efe4;
  --negative: #c0392b;
  --negative-bg: #f5e3e0;
  --baseline: #8a8171;
  --baseline-bg: #ece5d4;
  --shadow: 0 1px 2px rgba(31, 51, 41, 0.06), 0 8px 24px rgba(31, 51, 41, 0.07);
  --radius: 16px;
  --font-display: "Petrona", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--green-950);
  margin: 0 0 0.5em;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); line-height: 1.08; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; }
a { color: var(--green-600); }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 241, 231, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--card-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1180px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--green-950);
  text-decoration: none;
}
.brand-mark {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--green-600);
  display: flex; align-items: center; justify-content: center;
  color: #fff;
}
.brand-mark .icon { width: 17px; height: 17px; }

.icon {
  width: 1.2em;
  height: 1.2em;
  vertical-align: -0.2em;
  flex-shrink: 0;
}
.icon-lg { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a.active { color: var(--green-700, var(--green-600)); border-color: var(--green-500); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--green-600); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--green-800); }
.btn-outline { background: transparent; color: var(--green-800); border-color: var(--green-500); }
.btn-outline:hover { background: var(--green-100); }

/* ---- Hero ---- */
.hero {
  padding: 72px 0 48px;
  position: relative;
  overflow: hidden;
}
.hero { text-align: center; }
.hero-inner { max-width: 760px; margin: 0 auto; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; justify-content: center; }
.hero-lede { font-size: 1.15rem; color: var(--ink-muted); max-width: 52ch; margin-left: auto; margin-right: auto; }

/* ---- Hero performance metric ---- */
.hero-metric { margin: 48px auto 0; }
.hero-metric-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4.5rem, 13vw, 7.5rem);
  line-height: 0.95;
  color: var(--positive);
}
.hero-metric-label {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-top: 4px;
}
.hero-metric-sub { font-size: 0.85rem; color: var(--ink-muted); margin-top: 6px; }

/* ---- Stat ribbon ---- */
.stat-ribbon {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 56px 0;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow);
  text-align: center;
}
.stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--green-800);
  font-weight: 700;
  line-height: 1;
}
.stat-value-lead { font-size: 2.6rem; }
.stat-label {
  margin-top: 8px;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

/* ---- Sections ---- */
section { padding: 56px 0; }
.section-head { max-width: 62ch; margin-bottom: 36px; }
.section-head p { color: var(--ink-muted); }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

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

.step-num {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--green-600);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  margin-bottom: 14px;
}

.pill {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--gold);
  color: #fff;
}
.pill-muted { background: var(--bg-alt); color: var(--ink-muted); }

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--card-border); }
th { color: var(--ink-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.text-positive { color: var(--positive); font-weight: 700; }
.text-negative { color: var(--negative); font-weight: 700; }
.text-baseline { color: var(--baseline); font-weight: 700; }

.note {
  font-size: 0.85rem;
  color: var(--ink-muted);
  border-top: 1px dashed var(--card-border);
  margin-top: 16px;
  padding-top: 12px;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--card-border);
  padding: 40px 0;
  color: var(--ink-muted);
  font-size: 0.88rem;
}
.site-footer a { color: var(--green-700, var(--green-600)); }

/* ---- Simulation page ---- */
.sim-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 20px;
  align-items: start;
}
#map {
  height: 560px;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
}
.tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.tab-btn {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--ink);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
}
.tab-btn.active { background: var(--green-600); color: #fff; border-color: var(--green-600); }

.control-card { position: sticky; top: 90px; }
.slider-row { margin: 18px 0; }
.slider-row label { display: flex; justify-content: space-between; font-weight: 600; font-size: 0.9rem; margin-bottom: 8px; }
input[type="range"] { width: 100%; accent-color: var(--green-600); }

.kpi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.kpi {
  background: var(--baseline-bg);
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}
.kpi-value { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; color: var(--baseline); display: flex; align-items: center; justify-content: center; gap: 6px; }
.kpi-label { font-size: 0.78rem; color: var(--ink-muted); margin-top: 2px; }
.kpi-positive { background: var(--positive-bg); }
.kpi-positive .kpi-value { color: var(--positive); }
.kpi-negative { background: var(--negative-bg); }
.kpi-negative .kpi-value { color: var(--negative); }
.kpi-hero { grid-column: 1 / -1; padding: 22px; }
.kpi-hero .kpi-value { font-size: 2.75rem; }
.kpi-hero .kpi-label { font-size: 0.85rem; }

.sim-run-controls { display: flex; gap: 10px; margin-top: 18px; }

.legend-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 6px; }
.legend-swatch { width: 24px; height: 10px; border-radius: 4px; display: inline-block; margin-right: 6px; vertical-align: -1px; background: linear-gradient(90deg, rgb(200,148,78), rgb(192,57,43)); }

.chart-card { margin-top: 20px; }
canvas { max-width: 100%; }

/* ---- Diagrams ---- */
.diagram-wrap {
  overflow-x: auto;
  padding: 8px 0;
}
.diagram-wrap svg { display: block; margin: 0 auto; min-width: 640px; }
.diagram-caption {
  font-size: 0.85rem;
  color: var(--ink-muted);
  text-align: center;
  margin-top: 10px;
}
.callout {
  background: var(--green-100);
  border: 1px solid var(--green-300);
  border-radius: 12px;
  padding: 16px 18px;
  font-size: 0.92rem;
  color: var(--green-950);
}
.callout strong { color: var(--green-800); }
.stage-label { fill: var(--green-950); font-family: Inter, sans-serif; }

@media (max-width: 900px) {
  .hero-grid, .grid-3, .grid-2, .stat-ribbon, .sim-layout { grid-template-columns: 1fr; }
  .sim-layout .control-card { position: static; }
}