/* Wattcalc — Australian energy & sustainability calculators
   Single stylesheet. System fonts only. Mobile-first. */

:root {
  --accent: #E0851F;
  --accent-dark: #B8691A;
  --accent-soft: #FEF7EC;
  --accent-ring: rgba(224, 133, 31, 0.22);
  --text: #0F172A;
  --text-muted: #475569;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --bg: #FFFFFF;
  --bg-soft: #F8FAFC;
  --bg-card: #FFFFFF;
  --success: #047857;
  --warning: #B45309;
  --negative: #B91C1C;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 1px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --radius: 10px;
  --radius-lg: 14px;
  --max: 960px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { line-height: 1.25; color: var(--text); margin: 0 0 0.6em; }
h1 { font-size: 2rem; letter-spacing: -0.01em; }
h2 { font-size: 1.4rem; margin-top: 1.6em; }
h3 { font-size: 1.1rem; margin-top: 1.3em; }
p { margin: 0 0 1em; color: var(--text); }
small { color: var(--text-muted); }

/* ------------ Layout ------------- */
.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.site-header .inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 20px; max-width: var(--max); margin: 0 auto;
}
.brand {
  font-weight: 700; font-size: 1.3rem; letter-spacing: -0.015em;
  color: var(--text); display: inline-flex; align-items: baseline; gap: 1px;
}
.brand .wave { color: var(--accent); font-weight: 800; }
.brand:hover { text-decoration: none; }

.nav { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 0.92rem; }
.nav a {
  color: var(--text-muted); padding: 6px 4px; white-space: nowrap;
}
.nav a:hover, .nav a[aria-current="page"] {
  color: var(--accent-dark); text-decoration: none;
}
.nav-toggle {
  display: none; background: none; border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 0.9rem;
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    display: none; width: 100%; flex-direction: column; gap: 0;
    border-top: 1px solid var(--border); padding: 8px 0;
  }
  .nav.open { display: flex; }
  .site-header .inner { flex-wrap: wrap; }
  .nav a { padding: 10px 4px; }
}

main { padding: 28px 0 56px; }

.intro {
  max-width: 720px; color: var(--text-muted);
  font-size: 1.05rem; margin: 0 0 24px;
}

/* ------------ Calculator card ------------- */
.calc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin: 12px 0 24px;
}
.calc h2:first-child { margin-top: 0; }

.field { display: flex; flex-direction: column; margin-bottom: 16px; }
.field label {
  font-weight: 600; font-size: 0.92rem; margin-bottom: 6px; color: var(--text);
}
.field .hint {
  font-size: 0.82rem; color: var(--text-muted); margin-top: 4px;
}
.field input[type="text"],
.field input[type="number"],
.field input[type="tel"],
.field select {
  width: 100%; font: inherit; font-size: 1rem;
  padding: 11px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}

.row   { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.row-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 600px) {
  .row, .row-3 { grid-template-columns: 1fr; }
}

/* Toggle group (segmented control) */
.toggle-group {
  display: inline-flex;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px; flex-wrap: wrap;
}
.toggle-group input { position: absolute; opacity: 0; pointer-events: none; }
.toggle-group label {
  padding: 8px 14px; cursor: pointer; font-size: 0.9rem;
  border-radius: 7px; color: var(--text-muted); font-weight: 500;
  transition: background .15s, color .15s;
}
.toggle-group input:checked + label {
  background: var(--bg); color: var(--accent-dark);
  box-shadow: var(--shadow-sm); font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font: inherit; font-size: 0.95rem; font-weight: 600;
  padding: 10px 16px; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer; transition: all .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary {
  background: var(--bg); color: var(--text); border-color: var(--border-strong);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-dark); }

/* ------------ Results card ------------- */
.results {
  background: var(--accent-soft);
  border: 1px solid #FBE4BD;
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  margin: 0 0 24px;
}
.results h2 { margin-top: 0; }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.metric {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.metric .label {
  font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--text-muted); margin-bottom: 6px; font-weight: 600;
}
.metric .value {
  font-size: 1.4rem; font-weight: 700; color: var(--text);
  letter-spacing: -0.01em;
}
.metric .sub {
  font-size: 0.82rem; color: var(--text-muted); margin-top: 4px;
}
.metric.primary { background: var(--accent); border-color: var(--accent); }
.metric.primary .label { color: rgba(255,255,255,0.9); }
.metric.primary .value, .metric.primary .sub { color: #fff; }
.metric.positive .value { color: var(--success); }
.metric.negative .value { color: var(--negative); }

.summary-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 16px;
}
.summary-card strong { color: var(--text); }
.summary-card .recommendation {
  display: inline-block; margin-top: 6px;
  background: var(--accent); color: #fff;
  padding: 4px 10px; border-radius: 999px;
  font-size: 0.85rem; font-weight: 600;
}

/* Compare two-column layout used in EV vs Petrol */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}
@media (max-width: 600px) {
  .compare-grid { grid-template-columns: 1fr; }
}
.compare-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.compare-card h3 { margin: 0 0 6px; font-size: 1rem; }
.compare-card.ev   { border-color: #BFDBFE; background: #F0F7FF; }
.compare-card.ice  { border-color: #FCD9B6; background: #FFF7EC; }
.compare-card .big { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; }
.compare-card .row-line {
  display: flex; justify-content: space-between; gap: 8px;
  border-top: 1px solid var(--border); padding: 6px 0; font-size: 0.92rem;
}
.compare-card .row-line:first-of-type { border-top: 0; }
.compare-card .label-line { color: var(--text-muted); }

/* ------------ Tables ------------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.data {
  width: 100%; border-collapse: collapse; font-size: 0.92rem;
  background: var(--bg);
}
table.data th, table.data td {
  text-align: right; padding: 9px 12px;
  border-bottom: 1px solid var(--border);
}
table.data th:first-child, table.data td:first-child { text-align: left; }
table.data thead th {
  background: var(--bg-soft); font-weight: 600;
  position: sticky; top: 0;
}
table.data tbody tr:hover { background: var(--bg-soft); }
table.data tbody tr.break-even td {
  background: var(--accent-soft); font-weight: 600;
}

details.schedule {
  margin-top: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
}
details.schedule summary {
  cursor: pointer; padding: 12px 16px; font-weight: 600;
  color: var(--accent-dark); user-select: none;
  list-style: none;
}
details.schedule summary::-webkit-details-marker { display: none; }
details.schedule summary::after { content: " ▾"; font-size: 0.85em; }
details.schedule[open] summary::after { content: " ▴"; }
details.schedule .table-wrap { padding: 0 8px 12px; max-height: 460px; overflow: auto; }

/* ------------ Sections ------------- */
.section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  margin-bottom: 20px;
}
.section h2:first-child { margin-top: 0; }
.section ul { padding-left: 20px; margin: 0 0 0.5em; }
.section li { margin-bottom: 6px; }

.faq details {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}
.faq details:last-child { border-bottom: 1px solid var(--border); }
.faq summary {
  cursor: pointer; font-weight: 600; color: var(--text);
  padding: 0; list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent-dark); font-weight: 700; }
.faq details[open] summary::after { content: "−"; }
.faq details > div { padding-top: 10px; color: var(--text-muted); }

/* Inline chart (SVG break-even) */
.chart-wrap {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-top: 16px;
  overflow: hidden;
}
.chart-wrap svg { width: 100%; height: auto; display: block; }
.chart-legend {
  display: flex; gap: 16px; flex-wrap: wrap;
  font-size: 0.85rem; color: var(--text-muted); margin-top: 8px;
}
.chart-legend .swatch {
  display: inline-block; width: 12px; height: 12px;
  border-radius: 3px; margin-right: 6px; vertical-align: -1px;
}

/* ------------ AdSense placeholder ------------- */
.ad-slot {
  display: block;
  background: var(--bg-soft);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-muted);
  text-align: center;
  font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 22px 16px;
  margin: 22px 0;
  min-height: 90px;
}

/* ------------ Footer ------------- */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: 28px 0 36px;
  margin-top: 24px;
  font-size: 0.92rem;
  color: var(--text-muted);
}
.site-footer .container { display: grid; gap: 16px; }
.site-footer .footer-nav { display: flex; flex-wrap: wrap; gap: 12px 20px; }
.site-footer .disclaimer {
  font-size: 0.85rem; line-height: 1.55;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

/* ------------ Homepage ------------- */
.hero { text-align: left; padding: 24px 0 8px; }
.hero h1 { font-size: 2.4rem; max-width: 18ch; }
.hero p { font-size: 1.1rem; color: var(--text-muted); max-width: 56ch; }

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0 12px;
}
.calc-card {
  display: flex; flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.calc-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.calc-card h2 { margin: 0 0 6px; font-size: 1.1rem; color: var(--text); }
.calc-card p {
  font-size: 0.92rem; color: var(--text-muted); margin-bottom: 10px; flex: 1;
}
.calc-card .arrow { color: var(--accent-dark); font-weight: 600; font-size: 0.92rem; }

@media print {
  .site-header, .site-footer, .ad-slot, .nav-toggle { display: none; }
  .calc, .results, .section { box-shadow: none; border-color: #ccc; }
}

/* ───────────────────────── Articles ─────────────────────────────────────── */

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem; margin: 1.5rem 0 2rem;
}
.article-card {
  display: flex; flex-direction: column; gap: 0.5rem;
  padding: 1.25rem; background: #fff;
  border: 1px solid #e5e7eb; border-radius: 12px;
  text-decoration: none; color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.article-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.article-card h3 { margin: 0; font-size: 1.1rem; line-height: 1.35; color: #0f172a; }
.article-card p  { margin: 0; color: #475569; font-size: 0.95rem; }
.article-card .article-link {
  margin-top: auto; color: var(--accent-dark); font-weight: 600; font-size: 0.95rem;
}

.article { max-width: 720px; }
.article-meta { color: #64748b; font-size: 0.9rem; margin: 0 0 0.5rem; }
.article-meta a { color: #64748b; text-decoration: none; }
.article-meta a:hover { color: var(--accent-dark); }

.article-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 1.25rem;
}
.article-tags .tag {
  font-size: 0.78rem; background: #f1f5f9; color: #334155;
  padding: 0.2rem 0.6rem; border-radius: 999px;
}

.article-body { font-size: 1.05rem; line-height: 1.7; color: #1f2937; }
.article-body h2 { margin: 2rem 0 0.75rem; font-size: 1.4rem; color: #0f172a; }
.article-body h3 { margin: 1.5rem 0 0.5rem; font-size: 1.15rem; color: #0f172a; }
.article-body p  { margin: 0 0 1rem; }
.article-body ul, .article-body ol { margin: 0 0 1.25rem 1.25rem; }
.article-body li { margin-bottom: 0.4rem; }
.article-body table {
  width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: 0.95rem;
}
.article-body th, .article-body td {
  text-align: left; padding: 0.5rem 0.75rem; border-bottom: 1px solid #e5e7eb;
}
.article-body th { background: #f8fafc; font-weight: 600; }
.article-body blockquote {
  margin: 1rem 0; padding: 0.75rem 1rem;
  border-left: 4px solid var(--accent);
  background: #f8fafc; color: #334155; font-size: 0.98rem;
}
.article-body code {
  background: #f1f5f9; padding: 0.1rem 0.35rem;
  border-radius: 4px; font-size: 0.9em;
}
.article-body a {
  color: var(--accent-dark); text-decoration: underline; text-underline-offset: 2px;
}

.disclaimer-inline {
  margin: 1.5rem 0 1rem; padding: 0.85rem 1rem;
  background: #f8fafc; border: 1px solid #e5e7eb;
  border-radius: 8px; color: #475569; font-size: 0.9rem;
}

.article-back { margin-top: 2rem; }
.article-back a { color: var(--accent-dark); text-decoration: none; font-weight: 600; }

/* External-link arrow inside articles */
.article-body a[target="_blank"]::after {
  content: " \2197"; font-size: 0.85em; color: #64748b;
  margin-left: 0.1em; vertical-align: baseline;
}
.article-body a[target="_blank"]:hover::after { color: inherit; }