/* PV Repair — pvrepair.in */
:root {
  --brand: #0c2340;
  --brand-2: #163a63;
  --accent: #f5a524;
  --accent-ink: #8a5300;
  --sun: #f5a524;
  --teal: #0f8b8d;
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-2: #f3f1ec;
  --ink: #15202b;
  --ink-2: #3b4754;
  --muted: #66727f;
  --line: #e4e0d8;
  --danger: #b42318;
  --danger-bg: #fef3f2;
  --warn-bg: #fff8e6;
  --tip-bg: #ecfdf5;
  --tip: #067647;
  --info-bg: #eff6ff;
  --info: #1d4ed8;
  --shadow: 0 1px 2px rgba(12, 35, 64, .06), 0 8px 24px rgba(12, 35, 64, .06);
  --radius: 14px;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --c-inverter-errors: #2563eb;
  --c-panel-faults: #d97706;
  --c-wiring-protection: #dc2626;
  --c-batteries-hybrid: #059669;
  --c-maintenance: #0f8b8d;
  --c-design-tools: #7c3aed;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b131c; --surface: #111c27; --surface-2: #16232f; --ink: #e8edf2; --ink-2: #c3ccd6;
    --muted: #8f9cab; --line: #233344; --brand: #0c2340; --danger-bg: #2a1414; --warn-bg: #2a2110;
    --tip-bg: #0e2a20; --tip: #4ade80; --info-bg: #10203a; --info: #93b4ff; --accent-ink: #f5a524;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b131c; --surface: #111c27; --surface-2: #16232f; --ink: #e8edf2; --ink-2: #c3ccd6;
  --muted: #8f9cab; --line: #233344; --brand: #0c2340; --danger-bg: #2a1414; --warn-bg: #2a2110;
  --tip-bg: #0e2a20; --tip: #4ade80; --info-bg: #10203a; --info: #93b4ff; --accent-ink: #f5a524;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.wrap.narrow, .narrow { max-width: 820px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: #000; padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: #1b1300; border: 0; font: 600 .95rem var(--sans); padding: 11px 18px; border-radius: 10px; text-decoration: none; cursor: pointer; transition: transform .15s, box-shadow .15s; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(245,165,36,.35); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { box-shadow: none; border-color: var(--ink-2); }
.btn-light { background: #fff; color: var(--brand); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.6) blur(12px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; gap: 24px; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 1.2rem; letter-spacing: -.02em; flex-shrink: 0; }
.brand b { font-weight: 800; }
.brand small { color: var(--accent-ink); font-weight: 700; font-size: .95rem; }
.logo-mark { width: 34px; height: 34px; }
.main-nav { display: flex; gap: 2px; margin-left: auto; }
.main-nav a { text-decoration: none; font-size: .9rem; font-weight: 500; color: var(--ink-2); padding: 8px 10px; border-radius: 8px; white-space: nowrap; }
.main-nav a:hover, .main-nav a[aria-current] { background: var(--surface-2); color: var(--ink); }
.header-actions { display: flex; gap: 4px; }
.icon-btn { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; border: 0; background: transparent; color: var(--ink-2); cursor: pointer; }
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }
.icon-btn svg { width: 20px; height: 20px; }
.menu-btn { display: none; }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .i-sun { display: none; } :root:not([data-theme="light"]) .i-moon { display: block; } }
@media (max-width: 1080px) {
  .menu-btn { display: grid; }
  .main-nav { display: none; }
  .header-actions { margin-left: auto; }
}

/* Hero */
.hero { background: radial-gradient(1200px 500px at 85% -20%, rgba(245,165,36,.28), transparent 60%), linear-gradient(160deg, var(--brand) 0%, var(--brand-2) 100%); color: #fff; padding: 72px 0 64px; position: relative; overflow: hidden; }
.hero::after { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); background-size: 44px 44px; mask-image: linear-gradient(to bottom, #000, transparent 85%); pointer-events: none; }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: end; }
.eyebrow { display: inline-block; font: 600 .78rem var(--sans); text-transform: uppercase; letter-spacing: .12em; color: var(--accent); margin-bottom: 14px; }
.hero h1 { font: 800 clamp(2.2rem, 5vw, 3.6rem)/1.05 var(--sans); letter-spacing: -.035em; margin: 0 0 18px; }
.hero h1 em { font-family: var(--serif); font-weight: 400; font-style: italic; color: #ffd27a; letter-spacing: -.02em; }
.hero p { font-size: 1.12rem; color: #d6e0ec; max-width: 620px; margin: 0 0 26px; }
.hero-search { display: flex; align-items: center; gap: 8px; background: #fff; border-radius: 14px; padding: 6px 6px 6px 14px; max-width: 640px; box-shadow: 0 10px 30px rgba(0,0,0,.2); }
.hero-search > span svg { width: 20px; height: 20px; color: #66727f; }
.hero-search input { flex: 1; min-width: 0; border: 0; outline: 0; font: 1rem var(--sans); padding: 10px 4px; background: transparent; color: #15202b; }
.page-hero .hero-search { border: 1px solid var(--line); box-shadow: var(--shadow); background: var(--surface); }
.page-hero .hero-search input { color: var(--ink); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; font-size: .88rem; align-items: center; }
.hero-tags span { color: #9fb2c7; }
.hero-tags a { color: #fff; text-decoration: none; border: 1px solid rgba(255,255,255,.25); padding: 4px 10px; border-radius: 999px; }
.hero-tags a:hover { background: rgba(255,255,255,.1); }
.hero-stats { display: grid; gap: 12px; }
.hero-stats div { background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius); padding: 16px 20px; display: flex; align-items: baseline; gap: 12px; }
.hero-stats b { font-size: 2rem; font-weight: 800; color: var(--accent); letter-spacing: -.03em; }
.hero-stats span { color: #d6e0ec; }
@media (max-width: 860px) { .hero-inner { grid-template-columns: 1fr; gap: 28px; } .hero { padding: 48px 0; } .hero-stats { grid-template-columns: repeat(3, 1fr); } .hero-stats div { flex-direction: column; gap: 0; padding: 12px; } .hero-stats b { font-size: 1.5rem; } .hero-stats span { font-size: .8rem; } }
@media (max-width: 520px) { .hero-search .btn { display: none; } }

/* Sections */
section.wrap { margin-top: 56px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.section-head h2 { font: 800 1.6rem var(--sans); letter-spacing: -.02em; margin: 0; }
.section-head a { color: var(--accent-ink); font-weight: 600; text-decoration: none; font-size: .95rem; white-space: nowrap; }

/* Cards */
.grid { display: grid; gap: 22px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 960px) { .grid.three { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid.three { grid-template-columns: 1fr; } }
.card { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: transform .18s, box-shadow .18s, border-color .18s; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--line) 50%, var(--accent)); }
.card-link { position: absolute; inset: 0; z-index: 1; }
.card .chip { position: relative; z-index: 2; }
.card-art { height: 132px; display: grid; place-items: center; color: #fff; position: relative; overflow: hidden; }
.card-art svg { width: 54px; height: 54px; opacity: .95; position: relative; z-index: 1; }
.card-art::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.12) 1px, transparent 1px); background-size: 22px 22px; transform: perspective(300px) rotateX(35deg) scale(1.6); transform-origin: bottom; }
.card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card h3 { font: 700 1.08rem/1.35 var(--sans); letter-spacing: -.01em; margin: 0; }
.card p { margin: 0; color: var(--ink-2); font-size: .93rem; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.meta { display: flex; flex-wrap: wrap; gap: 6px; color: var(--muted); font-size: .82rem; margin-top: auto; padding-top: 6px; }
.chip { align-self: flex-start; font: 600 .72rem var(--sans); text-transform: uppercase; letter-spacing: .07em; color: var(--accent-ink); text-decoration: none; }
.chip:hover { text-decoration: underline; }
.cat-inverter-errors { background: linear-gradient(135deg, #1e40af, #3b82f6); }
.cat-panel-faults { background: linear-gradient(135deg, #b45309, #f59e0b); }
.cat-wiring-protection { background: linear-gradient(135deg, #991b1b, #ef4444); }
.cat-batteries-hybrid { background: linear-gradient(135deg, #065f46, #10b981); }
.cat-maintenance { background: linear-gradient(135deg, #115e59, #14b8a6); }
.cat-design-tools { background: linear-gradient(135deg, #5b21b6, #8b5cf6); }

.feature-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 22px; }
.card.lead .card-art { height: 260px; }
.card.lead .card-art svg { width: 90px; height: 90px; }
.card.lead h3 { font-size: 1.55rem; letter-spacing: -.02em; }
.card.lead p { -webkit-line-clamp: 4; font-size: 1rem; }
.side-list { display: grid; gap: 14px; }
.card.compact { flex-direction: row; }
.card.compact .card-art { width: 96px; height: auto; flex-shrink: 0; }
.card.compact .card-art svg { width: 32px; height: 32px; }
.card.compact .card-body { padding: 14px 16px; gap: 4px; }
.card.compact h3 { font-size: .98rem; }
.card.compact p { -webkit-line-clamp: 2; font-size: .86rem; }
@media (max-width: 860px) { .feature-grid { grid-template-columns: 1fr; } .card.lead .card-art { height: 170px; } }

.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 860px) { .cat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .cat-grid { grid-template-columns: 1fr; } }
.cat-card { background: var(--surface) !important; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; text-decoration: none; display: grid; grid-template-columns: auto 1fr; column-gap: 14px; row-gap: 2px; align-items: center; transition: box-shadow .18s, transform .18s; }
.cat-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.cat-card .cat-icon { grid-row: span 2; }
.cat-card b { font-size: 1.05rem; }
.cat-card small { color: var(--muted); }
.cat-card p { grid-column: 1 / -1; margin: 10px 0 0; color: var(--ink-2); font-size: .92rem; }
.cat-icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; color: #fff; }
.cat-icon svg { width: 24px; height: 24px; }
.cat-card.cat-inverter-errors .cat-icon { background: var(--c-inverter-errors); }
.cat-card.cat-panel-faults .cat-icon { background: var(--c-panel-faults); }
.cat-card.cat-wiring-protection .cat-icon { background: var(--c-wiring-protection); }
.cat-card.cat-batteries-hybrid .cat-icon { background: var(--c-batteries-hybrid); }
.cat-card.cat-maintenance .cat-icon { background: var(--c-maintenance); }
.cat-card.cat-design-tools .cat-icon { background: var(--c-design-tools); }
.cat-icon.xl { width: 72px; height: 72px; border-radius: 18px; flex-shrink: 0; }
.cat-icon.xl svg { width: 36px; height: 36px; }

.callout-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; border-radius: 20px; padding: 32px 36px; }
.callout-band h2 { margin: 0 0 6px; font-size: 1.4rem; }
.callout-band p { margin: 0; color: #d6e0ec; max-width: 640px; }
@media (max-width: 760px) { .callout-band { flex-direction: column; align-items: flex-start; padding: 24px; } }

/* Page hero */
.page-hero { padding: 44px 0 36px; border-bottom: 1px solid var(--line); background: var(--surface-2); }
.page-hero h1 { font: 800 clamp(1.9rem, 4vw, 2.6rem)/1.15 var(--sans); letter-spacing: -.03em; margin: 8px 0 10px; }
.page-hero .dek { font-size: 1.1rem; color: var(--ink-2); margin: 0 0 6px; max-width: 720px; }
.page-hero-row { display: flex; gap: 20px; align-items: center; }
.page-hero.center { text-align: center; padding: 80px 0; }
.big-code { font: 800 5rem/1 var(--sans); color: var(--accent); letter-spacing: -.05em; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: .85rem; color: var(--muted); }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); text-decoration: underline; }

/* Post */
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--accent); z-index: 60; }
.post-hero { padding: 48px 0 40px; background: var(--surface-2); border-bottom: 1px solid var(--line); position: relative; }
.post-hero::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 4px; }
.cat-inverter-errors-bg::before { background: var(--c-inverter-errors); }
.cat-panel-faults-bg::before { background: var(--c-panel-faults); }
.cat-wiring-protection-bg::before { background: var(--c-wiring-protection); }
.cat-batteries-hybrid-bg::before { background: var(--c-batteries-hybrid); }
.cat-maintenance-bg::before { background: var(--c-maintenance); }
.cat-design-tools-bg::before { background: var(--c-design-tools); }
.page-hero.cat-inverter-errors-bg, .page-hero[class*="-bg"] { position: relative; }
.page-hero[class*="-bg"]::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 4px; }
.post-hero h1 { font: 800 clamp(1.85rem, 4.2vw, 2.75rem)/1.12 var(--sans); letter-spacing: -.03em; margin: 14px 0 14px; text-wrap: balance; }
.post-hero .dek { font: 400 1.2rem/1.5 var(--serif); color: var(--ink-2); margin: 0 0 24px; }
.byline { display: flex; align-items: center; gap: 12px; }
.byline a { text-decoration: none; }
.byline .meta { padding: 0; }
.avatar { width: 42px; height: 42px; border-radius: 50%; background: var(--brand); color: var(--accent); display: grid; place-items: center; font: 800 .8rem var(--sans); flex-shrink: 0; border: 2px solid var(--accent); }
.avatar.lg { width: 56px; height: 56px; font-size: 1rem; }

.post-grid { display: grid; grid-template-columns: 250px minmax(0, 720px); gap: 56px; justify-content: center; padding-top: 40px; }
.toc { position: relative; }
.toc-inner { position: sticky; top: 92px; max-height: calc(100vh - 110px); overflow: auto; padding-right: 6px; }
.toc h2 { font: 700 .75rem var(--sans); text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 0 0 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--line); }
.toc li a { display: block; padding: 6px 0 6px 14px; margin-left: -2px; border-left: 2px solid transparent; text-decoration: none; color: var(--ink-2); font-size: .87rem; line-height: 1.4; }
.toc li a:hover { color: var(--ink); }
.toc li a.active { border-left-color: var(--accent); color: var(--ink); font-weight: 600; }
@media (max-width: 1020px) { .post-grid { grid-template-columns: minmax(0, 1fr); gap: 0; max-width: 780px; } .toc { display: none; } }

/* Prose */
.prose { font: 400 1.125rem/1.75 var(--serif); color: var(--ink); min-width: 0; }
.prose > *:first-child { margin-top: 0; }
.prose p { margin: 0 0 1.25em; }
.prose h2 { font: 800 1.6rem/1.25 var(--sans); letter-spacing: -.02em; margin: 2.2em 0 .7em; padding-top: .2em; }
.prose h3 { font: 700 1.22rem/1.35 var(--sans); letter-spacing: -.01em; margin: 1.8em 0 .5em; }
.prose h4 { font: 700 1.02rem var(--sans); margin: 1.5em 0 .4em; }
.prose a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
:root[data-theme="dark"] .prose a { color: #ffc35c; }
.prose a:hover { text-decoration-thickness: 2px; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.3em; }
.prose li { margin: .35em 0; }
.prose li::marker { color: var(--accent-ink); font-weight: 600; }
.prose strong { font-weight: 600; }
.prose blockquote { margin: 1.6em 0; padding: 4px 0 4px 22px; border-left: 3px solid var(--accent); font-style: italic; color: var(--ink-2); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.5em 0; }
.prose code { font: .88em ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--surface-2); border: 1px solid var(--line); padding: .1em .35em; border-radius: 6px; }
.prose pre { background: #0f1b28; color: #e6edf3; padding: 18px 20px; border-radius: 12px; overflow-x: auto; font-size: .9rem; line-height: 1.6; }
.prose pre code { background: none; border: 0; padding: 0; color: inherit; }
.table-wrap { overflow-x: auto; margin: 1.6em 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.prose table { border-collapse: collapse; width: 100%; font: .92rem/1.5 var(--sans); }
.prose th { text-align: left; background: var(--surface-2); font-weight: 700; color: var(--ink); }
.prose th, .prose td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose tr:last-child td { border-bottom: 0; }
.prose dl dt { font: 700 1rem var(--sans); margin-top: 1em; }
.prose dl dd { margin: .2em 0 0 0; }

.admonition { font: .98rem/1.65 var(--sans); border-radius: 12px; padding: 16px 20px; margin: 1.8em 0; border: 1px solid; }
.admonition p:last-child { margin-bottom: 0; }
.admonition-title { font-weight: 700; margin: 0 0 6px !important; display: flex; gap: 8px; align-items: center; }
.admonition-title::before { font-size: 1.1em; }
.admonition.danger, .admonition.warning { background: var(--danger-bg); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }
.admonition.danger .admonition-title, .admonition.warning .admonition-title { color: var(--danger); }
:root[data-theme="dark"] .admonition.danger .admonition-title { color: #ff8a80; }
.admonition.danger .admonition-title::before, .admonition.warning .admonition-title::before { content: "⚠"; }
.admonition.tip { background: var(--tip-bg); border-color: color-mix(in srgb, var(--tip) 30%, transparent); }
.admonition.tip .admonition-title { color: var(--tip); }
.admonition.tip .admonition-title::before { content: "✓"; }
.admonition.note, .admonition.info { background: var(--info-bg); border-color: color-mix(in srgb, var(--info) 30%, transparent); }
.admonition.note .admonition-title, .admonition.info .admonition-title { color: var(--info); }
.admonition.note .admonition-title::before, .admonition.info .admonition-title::before { content: "ℹ"; }
.admonition.summary { background: var(--surface-2); border-color: var(--line); }
.admonition.summary .admonition-title::before { content: "⚡"; }
.admonition ul { margin-bottom: 0; }

.post-foot { margin-top: 3em; display: grid; gap: 18px; font-family: var(--sans); }
.safety-note { font-size: .92rem; background: var(--warn-bg); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); border-radius: 12px; padding: 16px 18px; line-height: 1.6; }
.author-box { display: flex; gap: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px; font-size: .95rem; line-height: 1.6; }
.author-box p { margin: 4px 0 0; color: var(--ink-2); }
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; font-family: var(--sans); }
.post-nav a { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; text-decoration: none; background: var(--surface); display: flex; flex-direction: column; gap: 4px; }
.post-nav a:hover { border-color: var(--accent); }
.post-nav a.next { text-align: right; }
.post-nav small { color: var(--muted); font-size: .8rem; }
.post-nav span { font-weight: 600; font-size: .95rem; line-height: 1.35; }
@media (max-width: 600px) { .post-nav { grid-template-columns: 1fr; } .post-nav a.next { text-align: left; } }
.related { margin-bottom: 20px; }
.related h2 { font: 800 1.4rem var(--sans); margin: 0 0 18px; }
.ad-slot { margin: 2em 0; min-height: 120px; }

/* Index & search */
.index-list { margin-top: 36px; }
.index-group { margin-bottom: 36px; }
.index-group h2 { font: 800 1.25rem var(--sans); margin: 0 0 10px; }
.index-group h2 a { text-decoration: none; }
.index-group ul { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.index-group li { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.index-group li a { text-decoration: none; font-weight: 500; }
.index-group li a:hover { color: var(--accent-ink); text-decoration: underline; }
.search-results { list-style: none; padding: 0; margin: 0; }
.search-results li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.search-results a { font-weight: 700; font-size: 1.1rem; text-decoration: none; }
.search-results a:hover { text-decoration: underline; }
.search-results p { margin: 4px 0 0; color: var(--ink-2); }
.search-results mark { background: color-mix(in srgb, var(--accent) 35%, transparent); color: inherit; border-radius: 3px; }
.page-prose { padding: 36px 0 20px; }

/* Contact form */
.form { display: grid; gap: 14px; font-family: var(--sans); margin: 1.5em 0; }
.form label { display: grid; gap: 6px; font-weight: 600; font-size: .92rem; }
.form input, .form textarea, .form select { font: 1rem var(--sans); padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); }
.form textarea { min-height: 150px; resize: vertical; }

/* Footer */
.site-footer { margin-top: 80px; background: var(--brand); color: #c7d3e0; padding: 56px 0 24px; }
.site-footer .brand { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; }
.footer-about p { font-size: .92rem; line-height: 1.6; max-width: 420px; }
.site-footer .muted { color: #8ea3ba; }
.site-footer h4 { color: #fff; font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; margin: 6px 0 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.site-footer ul a { text-decoration: none; font-size: .92rem; }
.site-footer ul a:hover { color: #fff; text-decoration: underline; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; border-top: 1px solid rgba(255,255,255,.12); margin-top: 40px; padding-top: 20px; font-size: .84rem; color: #8ea3ba; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-about { grid-column: 1 / -1; } }

/* Cookie */
.cookie { position: fixed; left: 16px; right: 16px; bottom: 16px; max-width: 560px; margin: 0 auto; z-index: 80; background: var(--surface); border: 1px solid var(--line); box-shadow: 0 20px 50px rgba(0,0,0,.2); border-radius: 16px; padding: 18px 20px; display: grid; gap: 12px; font-size: .92rem; }
.cookie[hidden] { display: none; }
.cookie p { margin: 0; }
.cookie div { display: flex; gap: 8px; justify-content: flex-end; flex-wrap: wrap; }

@media print { .site-header, .site-footer, .toc, .related, .post-nav, .cookie, .progress { display: none !important; } .post-grid { display: block; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; } }

/* ---------- Images ---------- */
.card-art.has-img { height: auto; aspect-ratio: 16 / 9; background: var(--surface-2); }
.card-art.has-img::before { display: none; }
.card-art.has-img img { width: 100%; height: 100%; object-fit: cover; }
.card.lead .card-art.has-img { height: auto; }
.card.compact .card-art.has-img { width: 150px; aspect-ratio: auto; }
.card.compact .card-art.has-img img { object-position: center; }
@media (max-width: 520px) { .card.compact .card-art.has-img { width: 104px; } }
.prose figure { margin: 2.2em 0; }
.prose figure img { width: 100%; height: auto; border-radius: 14px; border: 1px solid var(--line); background: #fbfaf7; }
.prose figcaption { font: 500 .86rem/1.5 var(--sans); color: var(--muted); text-align: center; margin-top: 10px; }
.prose .cover-fig { margin: 0 0 2em; }
.prose .cover-fig img { border: 0; box-shadow: var(--shadow); }

/* ---------- Theme: Clean Energy (data-skin="fresh") ---------- */
:root[data-skin="fresh"] {
  --brand: #064e3b; --brand-2: #065f46; --accent: #10b981; --accent-ink: #047857;
  --sun: #fbbf24; --bg: #ffffff; --surface: #ffffff; --surface-2: #f2f7f5; --line: #e2ebe7; --ink: #0f1f1a; --ink-2: #374b44; --muted: #6a7d76;
  --serif: "Inter", system-ui, sans-serif; --head: "Plus Jakarta Sans", "Inter", sans-serif; --radius: 18px;
}
:root[data-skin="fresh"] .hero { background: radial-gradient(900px 420px at 90% 0%, #d1fae5, transparent 60%), linear-gradient(180deg, #f0fdf8, #ffffff); color: var(--ink); }
:root[data-skin="fresh"] .hero::after { background-image: radial-gradient(#10b98126 1.2px, transparent 1.2px); background-size: 22px 22px; }
:root[data-skin="fresh"] .hero p, :root[data-skin="fresh"] .hero-stats span { color: var(--ink-2); }
:root[data-skin="fresh"] .hero h1 em { font-family: var(--head); font-style: normal; color: var(--accent-ink); }
:root[data-skin="fresh"] .eyebrow { color: var(--accent-ink); }
:root[data-skin="fresh"] .hero-tags span { color: var(--muted); }
:root[data-skin="fresh"] .hero-tags a { color: var(--ink); border-color: var(--line); background: #fff; }
:root[data-skin="fresh"] .hero-search { border: 1px solid var(--line); box-shadow: 0 10px 30px rgba(6,78,59,.08); }
:root[data-skin="fresh"] .hero-stats div { background: #fff; border-color: var(--line); box-shadow: var(--shadow); }
:root[data-skin="fresh"] .hero-stats b { color: var(--accent-ink); }
:root[data-skin="fresh"] .btn { background: var(--accent-ink); color: #fff; }
:root[data-skin="fresh"] .btn-ghost { background: transparent; color: var(--ink); }
:root[data-skin="fresh"] .btn-light { background: #fff; color: var(--brand); }
:root[data-skin="fresh"] .prose { font-size: 1.08rem; line-height: 1.75; }
:root[data-skin="fresh"] .post-hero .dek { font-family: var(--sans); }
:root[data-skin="fresh"] .avatar { border-color: var(--accent); color: #fff; background: var(--accent-ink); }

/* ---------- Theme: Field Manual (data-skin="manual") ---------- */
:root[data-skin="manual"] {
  --brand: #1c1917; --brand-2: #292524; --accent: #f97316; --accent-ink: #c2410c;
  --sun: #f97316; --bg: #f7f3ea; --surface: #fffdf8; --surface-2: #efe8da; --line: #ddd3bf; --ink: #1c1917; --ink-2: #44403c; --muted: #78716c;
  --sans: "IBM Plex Sans", system-ui, sans-serif; --serif: "IBM Plex Serif", Georgia, serif; --head: "Space Grotesk", "IBM Plex Sans", sans-serif; --radius: 6px;
}
:root[data-skin="manual"] .hero { background: repeating-linear-gradient(-45deg, #f97316 0 18px, #1c1917 18px 36px) top / 100% 10px no-repeat, linear-gradient(160deg, #1c1917, #292524); }
:root[data-skin="manual"] .hero h1 em { font-family: var(--head); font-style: normal; color: var(--accent); }
:root[data-skin="manual"] .hero-stats b, :root[data-skin="manual"] .eyebrow { color: var(--accent); }
:root[data-skin="manual"] .btn { background: var(--accent); color: #1c1917; border-radius: 4px; }
:root[data-skin="manual"] .card, :root[data-skin="manual"] .cat-card, :root[data-skin="manual"] .hero-search, :root[data-skin="manual"] .table-wrap { border-radius: 6px; }
:root[data-skin="manual"] .card { border-width: 1.5px; }
:root[data-skin="manual"] .chip { font-family: var(--head); }
:root[data-skin="manual"] .site-header { border-bottom: 2px solid var(--ink); }
:root[data-skin="manual"] .callout-band { border-radius: 6px; }
:root[data-skin="manual"] .site-footer { background: #1c1917; }
:root[data-skin="manual"] .avatar { background: #1c1917; }

/* Shared heading font hook */
:root[data-skin] .hero h1, :root[data-skin] .page-hero h1, :root[data-skin] .post-hero h1, :root[data-skin] .prose h2, :root[data-skin] .prose h3,
:root[data-skin] .card h3, :root[data-skin] .section-head h2, :root[data-skin] .related h2, :root[data-skin] .brand, :root[data-skin] .cat-card b,
:root[data-skin] .callout-band h2, :root[data-skin] .index-group h2 { font-family: var(--head, var(--sans)); }

:root[data-skin="fresh"][data-theme="dark"] { --bg: #08130f; --surface: #0e1c17; --surface-2: #13251e; --line: #1f3a30; --ink: #e6f2ed; --ink-2: #b9cdc5; --muted: #85a096; --accent-ink: #34d399; }
@media (prefers-color-scheme: dark) { :root[data-skin="fresh"]:not([data-theme="light"]) { --bg: #08130f; --surface: #0e1c17; --surface-2: #13251e; --line: #1f3a30; --ink: #e6f2ed; --ink-2: #b9cdc5; --muted: #85a096; --accent-ink: #34d399; } }
:root[data-skin="fresh"][data-theme="dark"] .hero { background: radial-gradient(900px 420px at 90% 0%, #064e3b, transparent 60%), linear-gradient(180deg, #0b1f19, #08130f); }
@media (prefers-color-scheme: dark) { :root[data-skin="fresh"]:not([data-theme="light"]) .hero { background: radial-gradient(900px 420px at 90% 0%, #064e3b, transparent 60%), linear-gradient(180deg, #0b1f19, #08130f); } }
:root[data-skin="fresh"][data-theme="dark"] .hero-search, :root[data-skin="fresh"][data-theme="dark"] .hero-stats div, :root[data-skin="fresh"][data-theme="dark"] .hero-tags a { background: var(--surface); }
:root[data-skin="fresh"][data-theme="dark"] .hero-search input { color: var(--ink); }

/* ---------- Mobile menu: shared ---------- */
.mnav[hidden] { display: none; }
.mnav { position: fixed; inset: 0; z-index: 90; }
html.mnav-lock { overflow: hidden; }
.mnav-backdrop { position: absolute; inset: 0; background: rgba(4, 18, 13, .55); opacity: 0; transition: opacity .28s ease; }
.mnav.open .mnav-backdrop { opacity: 1; }
.mnav-panel { position: absolute; background: var(--surface); color: var(--ink); overflow-y: auto; overscroll-behavior: contain; display: flex; flex-direction: column; gap: 4px;
  padding: 14px 18px calc(18px + env(safe-area-inset-bottom)); box-shadow: 0 24px 60px rgba(0,0,0,.28); transition: transform .32s cubic-bezier(.2,.8,.2,1); }
.mnav-grab { display: none; width: 44px; height: 5px; border-radius: 3px; background: var(--line); margin: 0 auto 8px; }
.mnav-head { display: flex; align-items: center; justify-content: space-between; font: 800 1.12rem var(--head, var(--sans)); letter-spacing: -.01em; margin-bottom: 8px; }
.mnav-search { display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--surface-2); border-radius: 12px; padding: 4px 12px; }
.mnav-search svg { width: 18px; height: 18px; color: var(--muted); }
.mnav-search input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; font: 16px var(--sans); color: var(--ink); padding: 10px 0; }
.mnav-label { font: 700 .72rem var(--sans); text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 16px 4px 6px; }
.mnav-cats { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.mnav-cats a { display: flex; align-items: center; gap: 12px; padding: 9px 10px; border-radius: 12px; text-decoration: none; color: var(--ink); }
.mnav-cats a:hover, .mnav-cats a:focus-visible, .mnav-cats a[aria-current] { background: var(--surface-2); }
.mnav-cats a[aria-current] b { color: var(--accent-ink); }
.mnav-ico { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; color: #fff; flex: none; }
.mnav-ico svg { width: 21px; height: 21px; }
.mnav-txt b { display: block; font-weight: 650; font-size: 1rem; line-height: 1.25; }
.mnav-txt small { color: var(--muted); font-size: .8rem; }
.mnav-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.mnav-links a { display: inline-block; text-decoration: none; color: var(--ink); border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px; font-size: .9rem; }
.mnav-theme { margin-top: 16px; display: flex; align-items: center; gap: 10px; justify-content: center; border: 1px solid var(--line); background: transparent; color: var(--ink-2); border-radius: 12px; padding: 12px; font: 500 .92rem var(--sans); cursor: pointer; }
.mnav-theme svg { width: 18px; height: 18px; }
.mnav-theme .i-moon { display: none; }
:root[data-theme="dark"] .mnav-theme .i-sun { display: none; }
:root[data-theme="dark"] .mnav-theme .i-moon { display: block; }

/* Option A — side drawer */
[data-mnav="drawer"] .mnav-panel { top: 0; right: 0; bottom: 0; width: min(86vw, 360px); border-radius: 22px 0 0 22px; transform: translateX(104%); padding-top: 18px; }
[data-mnav="drawer"] .mnav.open .mnav-panel { transform: none; }
[data-mnav="drawer"] .mnav-cats a::after { content: "›"; margin-left: auto; color: var(--muted); font-size: 1.4rem; line-height: 1; }

/* Option B — bottom sheet, and the tab bar's topic sheet */
[data-mnav="sheet"] .mnav-panel, [data-mnav="tabbar"] .mnav-panel { left: 0; right: 0; bottom: 0; max-height: 88vh; border-radius: 24px 24px 0 0; transform: translateY(104%); }
[data-mnav="sheet"] .mnav.open .mnav-panel, [data-mnav="tabbar"] .mnav.open .mnav-panel { transform: none; }
[data-mnav="sheet"] .mnav-grab, [data-mnav="tabbar"] .mnav-grab { display: block; }
[data-mnav="sheet"] .mnav-cats, [data-mnav="tabbar"] .mnav-cats { grid-template-columns: 1fr 1fr; gap: 10px; }
[data-mnav="sheet"] .mnav-cats a, [data-mnav="tabbar"] .mnav-cats a { flex-direction: column; align-items: flex-start; gap: 10px; padding: 14px; border: 1px solid var(--line); min-height: 112px; }

/* Option C — app-style bottom tab bar */
.tabbar { display: none; }
@media (max-width: 1080px) {
  [data-mnav="tabbar"] .menu-btn { display: none; }
  [data-mnav="tabbar"] .tabbar { display: grid; grid-template-columns: repeat(4, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 70;
    background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: saturate(1.6) blur(14px); border-top: 1px solid var(--line);
    padding: 6px 6px calc(6px + env(safe-area-inset-bottom)); }
  [data-mnav="tabbar"] .tabbar a, [data-mnav="tabbar"] .tabbar button { display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 6px 0; border: 0; background: none;
    color: var(--muted); font: 600 .7rem var(--sans); text-decoration: none; border-radius: 12px; cursor: pointer; }
  [data-mnav="tabbar"] .tabbar svg { width: 22px; height: 22px; }
  [data-mnav="tabbar"] .tabbar a:hover, [data-mnav="tabbar"] .tabbar button:hover, [data-mnav="tabbar"] .tabbar [aria-expanded="true"] { color: var(--accent-ink); background: var(--surface-2); }
  [data-mnav="tabbar"] body { padding-bottom: calc(72px + env(safe-area-inset-bottom)); }
  [data-mnav="tabbar"] .cookie { bottom: calc(84px + env(safe-area-inset-bottom)); }
}
@media (prefers-reduced-motion: reduce) { .mnav-panel, .mnav-backdrop { transition: none !important; } }

/* ---------- Desktop header variants ---------- */
.hdr-search { display: flex; align-items: center; gap: 8px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; padding: 0 14px; height: 40px; width: 210px; transition: border-color .15s, box-shadow .15s; }
.hdr-search svg { width: 17px; height: 17px; color: var(--muted); flex: none; }
.hdr-search input { border: 0; outline: 0; background: transparent; font: .92rem var(--sans); color: var(--ink); flex: 1; min-width: 0; }
.hdr-search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
[data-header="mega"] .search-icon, [data-header="tworow"] .search-icon { display: none; }

/* Option B — mega menu */
[data-header="mega"] .main-nav { margin-left: 28px; align-items: center; }
[data-header="mega"] .header-actions { margin-left: auto; align-items: center; gap: 8px; }
.mega-btn { display: inline-flex; align-items: center; gap: 4px; font: 600 .9rem var(--sans); color: var(--ink); background: none; border: 0; padding: 8px 12px; border-radius: 8px; cursor: pointer; }
.mega-btn svg { width: 16px; height: 16px; transition: transform .2s; }
.mega-btn:hover, .mega-btn[aria-expanded="true"] { background: var(--surface-2); }
.mega-btn[aria-expanded="true"] svg { transform: rotate(180deg); }
.mega-panel { position: absolute; left: 0; right: 0; top: 100%; background: var(--surface); border-bottom: 1px solid var(--line); box-shadow: 0 28px 50px rgba(0, 0, 0, .12); padding: 28px 0 20px; }
.mega-panel[hidden] { display: none; }
.mega-grid { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px 36px; }
.main-nav .mega-panel a { padding: 0; white-space: normal; background: none; border-radius: 0; }
.main-nav .mega-panel .mega-cat { display: flex; align-items: center; gap: 12px; color: var(--ink); margin-bottom: 10px; }
.mega-cat b { display: block; font-size: 1rem; }
.mega-cat small { color: var(--muted); font-size: .8rem; }
.main-nav .mega-cat:hover b { color: var(--accent-ink); }
.mega-col ul { list-style: none; margin: 0; padding: 0 0 0 52px; display: grid; gap: 7px; }
.main-nav .mega-col li a { color: var(--ink-2); font-size: .89rem; line-height: 1.35; }
.main-nav .mega-col li a:hover { color: var(--accent-ink); text-decoration: underline; }
.mega-foot { max-width: 1160px; margin: 24px auto 0; padding: 16px 0 0; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 20px; font-size: .88rem; color: var(--muted); }
.main-nav .mega-foot a { color: var(--accent-ink); font-weight: 600; }

/* Option C — two-row header */
[data-header="tworow"] .header-inner { gap: 28px; }
.hdr-search.wide { flex: 1; max-width: 540px; width: auto; height: 44px; }
.util-links { display: flex; gap: 2px; margin-left: auto; }
.util-links a { text-decoration: none; font-size: .9rem; font-weight: 500; color: var(--ink-2); padding: 8px 10px; border-radius: 8px; }
.util-links a:hover { background: var(--surface-2); color: var(--ink); }
.cat-tabs-wrap { border-top: 1px solid var(--line); }
.cat-tabs { display: flex; gap: 4px; height: 50px; align-items: stretch; overflow-x: auto; scrollbar-width: none; }
.cat-tabs a { display: flex; align-items: center; gap: 8px; padding: 0 12px; text-decoration: none; color: var(--ink-2); font-weight: 500; font-size: .92rem; white-space: nowrap; border-bottom: 2.5px solid transparent; }
.cat-tabs a:hover { color: var(--ink); background: var(--surface-2); }
.cat-tabs a[aria-current] { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }
.tab-ico { display: inline-grid; }
.tab-ico svg { width: 18px; height: 18px; }
[data-header="tworow"] { scroll-padding-top: 134px; }
[data-header="tworow"] .toc-inner { top: 142px; max-height: calc(100vh - 160px); }
[data-header="tworow"] .main-nav { display: none; }

@media (max-width: 1080px) {
  .hdr-search, .util-links, .cat-tabs-wrap { display: none; }
  [data-header] .search-icon { display: grid; }
  [data-header="tworow"] { scroll-padding-top: 84px; }
}

/* ---------- Footer variants ---------- */
.f-rich .f-cta { display: flex; justify-content: space-between; align-items: center; gap: 24px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .14); border-radius: 18px; padding: 26px 30px; margin-bottom: 44px; }
.f-rich .f-cta h3 { color: #fff; margin: 0 0 6px; font: 800 1.3rem var(--head, var(--sans)); }
.f-rich .f-cta p { margin: 0; color: #cfe3da; max-width: 620px; }
.footer-grid.f5 { grid-template-columns: 1.6fr 1fr 1.25fr .9fr .9fr; }
.site-footer .f-cat { display: flex; align-items: center; gap: 10px; }
.f-dot { width: 24px; height: 24px; border-radius: 7px; display: grid; place-items: center; color: #fff; flex: none; }
.f-dot svg { width: 14px; height: 14px; }
.f-safety { font-size: .84rem !important; line-height: 1.55; background: rgba(251, 191, 36, .1); border: 1px solid rgba(251, 191, 36, .3); padding: 10px 12px; border-radius: 10px; color: #f8e3b4; }
@media (max-width: 960px) { .footer-grid.f5 { grid-template-columns: 1fr 1fr; } .f-rich .f-cta { flex-direction: column; align-items: flex-start; padding: 22px; } }

.site-footer.f-min { background: var(--surface-2); color: var(--ink-2); border-top: 1px solid var(--line); padding: 48px 0 36px; }
.f-min-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 16px; }
.f-min .brand { color: var(--ink); }
.f-min p { margin: 0; }
.f-min-desc { max-width: 560px; }
.f-min-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 20px; }
.f-min-links a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: .95rem; }
.f-min-links.small a { font-weight: 400; color: var(--muted); font-size: .88rem; }
.f-min-links a:hover { color: var(--accent-ink); text-decoration: underline; }
.f-min-safety { font-size: .84rem; color: var(--muted); max-width: 640px; padding-top: 14px; border-top: 1px solid var(--line); }
.f-min-copy { font-size: .84rem; color: var(--muted); }

/* Logo and CTA contrast on dark footers */
.site-footer:not(.f-min) .logo-mark rect { fill: #059669; }
:root[data-skin="navy"] .site-footer:not(.f-min) .logo-mark rect { fill: #163a63; }
:root[data-skin="manual"] .site-footer:not(.f-min) .logo-mark rect { fill: #44403c; }
.site-footer:not(.f-min) .brand small { color: #6ee7b7; }
:root[data-skin="navy"] .site-footer .brand small, :root[data-skin="manual"] .site-footer .brand small { color: var(--accent); }
.f-rich .f-cta .btn { background: #fff; color: #064e3b; }