/* Watt Weekender — navy + amber, trust-first */
:root {
  --navy: #0b1f3a;
  --navy-2: #14345c;
  --amber: #d97706;
  --amber-soft: #fef3c7;
  --ink: #1a2332;
  --muted: #5b6b7c;
  --bg: #f7f8fa;
  --card: #ffffff;
  --border: #e2e8f0;
  --ok: #047857;
  --max: 760px;
  --wide: 960px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 1.05rem;
}
a { color: var(--navy-2); }
a:hover { color: var(--amber); }
.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 1.25rem; }
.main { padding: 2rem 1.25rem 3.5rem; max-width: var(--max); }
.main.wide { max-width: var(--wide); }

/* Header */
.site-header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: 0 1px 0 rgba(0,0,0,.15);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.5rem;
  max-width: var(--wide);
}
.logo {
  color: #fff;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  font-size: 1.1rem;
}
.logo:hover { color: var(--amber-soft); }
.site-nav { display: flex; flex-wrap: wrap; gap: .15rem .85rem; }
.site-nav a {
  color: #dbe4f0;
  text-decoration: none;
  font-size: .92rem;
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover, .site-nav a.active {
  color: #fff;
  border-bottom-color: var(--amber);
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  font-size: 1.2rem;
  padding: .2rem .55rem;
  border-radius: 4px;
  cursor: pointer;
}
@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    padding-bottom: .75rem;
  }
  .site-nav.open { display: flex; }
  .header-inner { flex-wrap: wrap; padding-top: .5rem; padding-bottom: .5rem; }
}

/* Typography in articles */
.prose h1 { font-size: 1.85rem; line-height: 1.25; color: var(--navy); margin: 0 0 1rem; }
.prose h2 { font-size: 1.35rem; color: var(--navy); margin: 2rem 0 .75rem; border-bottom: 1px solid var(--border); padding-bottom: .35rem; }
.prose h3 { font-size: 1.12rem; color: var(--navy-2); margin: 1.5rem 0 .5rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1rem; }
.prose li { margin: .25rem 0; }
.prose blockquote {
  margin: 1.25rem 0;
  padding: .9rem 1.1rem;
  background: var(--amber-soft);
  border-left: 4px solid var(--amber);
  color: var(--ink);
  border-radius: 0 6px 6px 0;
}
.prose blockquote p { margin: 0 0 .5rem; }
.prose blockquote p:last-child { margin: 0; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  margin: 1rem 0 1.5rem;
  display: block;
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.prose th, .prose td {
  border: 1px solid var(--border);
  padding: .55rem .7rem;
  text-align: left;
  vertical-align: top;
}
.prose th { background: #eef2f7; color: var(--navy); font-weight: 600; }
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .88em;
  background: #eef2f7;
  padding: .1em .35em;
  border-radius: 3px;
}
.prose pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
}
.prose pre code { background: transparent; color: inherit; padding: 0; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* Home */
.hero {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem 1.5rem;
  margin-bottom: 1.75rem;
  box-shadow: 0 1px 2px rgba(11,31,58,.04);
}
.hero h1 { margin: 0 0 .6rem; color: var(--navy); font-size: 1.9rem; line-height: 1.2; }
.hero .tagline { color: var(--muted); font-size: 1.05rem; margin: 0 0 1.1rem; }
.btn {
  display: inline-block;
  background: var(--amber);
  color: #fff !important;
  text-decoration: none;
  font-weight: 600;
  padding: .65rem 1.15rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: .95rem;
}
.btn:hover { background: #b45309; }
.btn-secondary {
  background: transparent;
  color: var(--navy) !important;
  border: 1px solid var(--navy);
  margin-left: .5rem;
}
.btn-secondary:hover { background: #eef2f7; }
.cta-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }

.section-title {
  color: var(--navy);
  font-size: 1.25rem;
  margin: 0 0 1rem;
}
.guide-list { list-style: none; padding: 0; margin: 0 0 2rem; }
.guide-list li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: .75rem;
  padding: 1rem 1.15rem;
}
.guide-list a.title {
  font-weight: 650;
  text-decoration: none;
  color: var(--navy);
  font-size: 1.05rem;
}
.guide-list a.title:hover { color: var(--amber); }
.guide-list .excerpt { color: var(--muted); font-size: .95rem; margin: .35rem 0 0; }
.meta-line { font-size: .85rem; color: var(--muted); margin-top: .35rem; }

.disclosure-banner {
  background: var(--amber-soft);
  border-left: 4px solid var(--amber);
  padding: .85rem 1rem;
  border-radius: 0 6px 6px 0;
  font-size: .95rem;
  margin: 1.5rem 0;
}
.disclosure-banner a { font-weight: 600; }

.calc-cta {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #fff;
  border-radius: 10px;
  padding: 1.5rem;
  margin: 2rem 0;
}
.calc-cta h2 { margin: 0 0 .5rem; color: #fff; font-size: 1.25rem; }
.calc-cta p { margin: 0 0 1rem; color: #dbe4f0; }
.calc-cta .btn { background: var(--amber); }

/* Calculator UI */
.calc-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.calc-panel h2 { margin-top: 0; color: var(--navy); font-size: 1.15rem; }
.calc-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.calc-table th, .calc-table td { border-bottom: 1px solid var(--border); padding: .45rem .35rem; text-align: left; }
.calc-table input[type="text"],
.calc-table input[type="number"],
.calc-controls select,
.calc-controls input {
  width: 100%;
  max-width: 100%;
  padding: .4rem .5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font: inherit;
}
.calc-controls { display: flex; flex-wrap: wrap; gap: 1rem; align-items: end; margin: 1rem 0; }
.calc-controls label { display: flex; flex-direction: column; gap: .25rem; font-size: .9rem; font-weight: 600; color: var(--navy); }
.calc-results {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  border-radius: 8px;
  padding: 1rem 1.15rem;
  margin-top: 1rem;
}
.calc-results h3 { margin: 0 0 .5rem; color: var(--ok); }
.calc-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  padding: .75rem 1rem;
  border-radius: 6px;
  display: none;
  margin-top: .75rem;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--navy);
  padding: .45rem .8rem;
  border-radius: 4px;
  cursor: pointer;
  font: inherit;
}
.btn-ghost:hover { background: #eef2f7; }
.preset-row { margin: .75rem 0; }

/* Footer */
.site-footer {
  background: var(--navy);
  color: #c5d0de;
  padding: 2rem 0 2.5rem;
  font-size: .9rem;
}
.footer-inner { max-width: var(--wide); }
.footer-links { display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; margin-bottom: 1rem; }
.footer-links a { color: #e8eef7; text-decoration: none; }
.footer-links a:hover { color: var(--amber-soft); }
.footer-note { margin: 0 0 .75rem; line-height: 1.55; max-width: 52rem; }
.footer-copy { margin: 0; color: #8a9bb0; font-size: .85rem; }

.page-kicker { color: var(--muted); font-size: .9rem; margin-bottom: .35rem; text-transform: uppercase; letter-spacing: .04em; }