:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1c2733;
  --ink-soft: #5a6776;
  --accent: #166a4d;
  --accent-2: #2f8f6c;
  --accent-soft: #d5ece2;
  --good: #1b8d5a;
  --bad: #c14b3a;
  --mid: #d68a2a;
  --border: #e3e7ec;
  --shadow: 0 1px 2px rgba(28,39,51,.06), 0 4px 12px rgba(28,39,51,.04);
  --rad: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- topbar ---------- */
.topbar {
  background: linear-gradient(135deg, #103f2d 0%, #1d6a4c 100%);
  color: #fff;
  padding: 14px 24px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 50;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.logo {
  width: 38px; height: 38px;
  background: #fff;
  color: var(--accent);
  font-weight: 700;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 14px;
}
.brand-title { font-size: 17px; font-weight: 600; }
.brand-sub   { font-size: 12px; opacity: .85; }

.mainnav { display: flex; flex-wrap: wrap; gap: 4px; }
.mainnav a {
  color: #fff;
  background: rgba(255,255,255,.06);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
}
.mainnav a:hover { background: rgba(255,255,255,.15); text-decoration: none; }
.mainnav a.active { background: #fff; color: var(--accent); }

/* ---------- main ---------- */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

section.tab { display: none; }
section.tab.active { display: block; }

h1 { font-size: 28px; margin: 0 0 8px; line-height: 1.2; }
h2 { font-size: 20px; margin: 32px 0 12px; }
h3 { font-size: 16px; margin: 16px 0 8px; }
.section-lead, .lead { color: var(--ink-soft); font-size: 15px; margin: 8px 0 24px; max-width: 900px; }
p { margin: 8px 0; }
code { background: #eef0f3; padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }

/* ---------- hero / inicio ---------- */
.hero h1 { font-size: 32px; max-width: 900px; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card.stat { text-align: center; }
.card.stat .stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--accent);
}
.card.stat .stat-label {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 4px;
}
.card.stat.highlight {
  background: linear-gradient(135deg, #166a4d, #2f8f6c);
  color: #fff;
}
.card.stat.highlight .stat-value,
.card.stat.highlight .stat-label { color: #fff; }

.findings { display: grid; gap: 12px; margin: 16px 0 32px; }
.finding {
  background: var(--panel);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 14px 18px;
  box-shadow: var(--shadow);
}
.finding h3 { margin-top: 0; color: var(--accent); }

.howto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.howto-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 18px 16px;
  position: relative;
  box-shadow: var(--shadow);
}
.howto-num {
  position: absolute;
  top: -14px; left: 14px;
  width: 28px; height: 28px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
}
.howto-card h4 { margin: 4px 0 6px; font-size: 14px; }

/* ---------- system cards ---------- */
.systems {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  margin: 24px 0;
}
.system-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 18px;
  box-shadow: var(--shadow);
}
.system-card h3 { margin-top: 0; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.system-stat {
  margin-top: 12px;
  padding: 8px 10px;
  background: var(--accent-soft);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}

.badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef0f3;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge.good { background: #d6ebe0; color: var(--good); }
.badge.bad  { background: #fadcd6; color: var(--bad); }
.badge.mid  { background: #fbe9cf; color: var(--mid); }

/* ---------- controls ---------- */
.control-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 16px 0 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px 14px;
  border-radius: var(--rad);
  box-shadow: var(--shadow);
}
.control-row label { font-size: 13px; color: var(--ink-soft); display: flex; align-items: center; gap: 6px; }
.control-row select, .slider input[type=range], .sim-controls select {
  font: inherit;
}
select {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
}

/* ---------- chart wrap ---------- */
.chart-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 14px;
  box-shadow: var(--shadow);
  margin: 12px 0;
  position: relative;
  height: 360px;
}
.chart-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 720px) {
  .chart-grid-2 { grid-template-columns: 1fr; }
}

/* ---------- tables ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border-radius: var(--rad);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin: 12px 0;
}
.data-table th, .data-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 13px;
}
.data-table th { background: #f0f3f6; color: var(--ink-soft); font-weight: 600; }
.data-table tr:last-child td { border-bottom: 0; }
.data-table td:not(:first-child), .data-table th:not(:first-child) { text-align: right; }

/* ---------- maps gallery ---------- */
.map-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}
.map-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 8px;
  cursor: pointer;
  transition: transform .12s, box-shadow .12s;
  box-shadow: var(--shadow);
}
.map-item:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(28,39,51,.10); }
.map-item img {
  width: 100%; height: 150px; object-fit: cover; border-radius: 6px; background: #f4f5f7;
}
.map-item .map-title { font-size: 12px; margin-top: 6px; color: var(--ink); font-weight: 600; }
.map-item .map-desc  { font-size: 11px; color: var(--ink-soft); margin-top: 2px; }

.lightbox {
  display: none;
  position: fixed; inset: 0;
  background: rgba(15, 22, 30, 0.9);
  z-index: 999;
  align-items: center; justify-content: center;
  padding: 32px;
}
.lightbox.open { display: flex; }
.lightbox-inner {
  max-width: 95vw; max-height: 95vh;
  position: relative;
  background: #fff;
  border-radius: 8px;
  padding: 14px 14px 8px;
}
.lightbox img { max-width: 88vw; max-height: 78vh; object-fit: contain; display: block; }
.lightbox-close {
  position: absolute; top: 6px; right: 8px;
  background: transparent; border: 0; font-size: 28px; cursor: pointer; color: var(--ink-soft);
}
#lightbox-caption { padding: 8px 4px; font-size: 13px; color: var(--ink-soft); }

/* ---------- figures ---------- */
.figure {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 12px;
  margin: 12px 0;
  box-shadow: var(--shadow);
}
.figure img { max-width: 100%; height: auto; display: block; }
.figure figcaption { font-size: 12px; color: var(--ink-soft); margin-top: 8px; text-align: center; }

/* ---------- simulator ---------- */
.simulator {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 900px) {
  .simulator { grid-template-columns: 1fr; }
}
.sim-controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 16px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 110px;
}
.sim-controls h3 { margin-top: 0; }
.sim-controls label { display: block; font-size: 13px; color: var(--ink-soft); margin: 12px 0 4px; }
.sim-controls select { width: 100%; }
.slider { margin-top: 10px; }
.slider label {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.slider label output {
  background: var(--accent-soft); color: var(--accent);
  padding: 2px 8px; border-radius: 999px; font-weight: 600; font-variant-numeric: tabular-nums;
}
.slider input[type=range] {
  width: 100%; margin-top: 4px;
  accent-color: var(--accent);
}
.btn-primary, .btn-secondary {
  width: 100%; padding: 10px;
  border-radius: 7px; font-weight: 600; font-size: 13px;
  cursor: pointer; margin-top: 12px;
  border: 0;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); }
.btn-secondary { background: #eef0f3; color: var(--ink); }
.btn-secondary:hover { background: #e1e5ea; }

.sim-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.sim-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  box-shadow: var(--shadow);
}
.sim-card span { font-size: 11px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .04em; }
.sim-card strong { display: block; margin-top: 4px; font-size: 16px; color: var(--accent); font-variant-numeric: tabular-nums; }

.sim-explain {
  margin-top: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad);
  padding: 12px 16px;
  box-shadow: var(--shadow);
}
.sim-explain summary { cursor: pointer; font-weight: 600; color: var(--accent); }
.sim-explain .warn { color: var(--bad); }

/* ---------- footer ---------- */
footer {
  max-width: 1200px;
  margin: 24px auto 0;
  padding: 14px 24px;
  border-top: 1px solid var(--border);
  color: var(--ink-soft);
  font-size: 12px;
  text-align: center;
}