/* ==========================================================================
   Energy Security: solar, batteries and smart energy management
   Brand: volt green to grid cyan on deep night navy; solar amber for sunlight.
   ========================================================================== */

:root {
  --bg: #060c15;
  --bg-2: #0b1220;
  --surface: #0f1729;
  --surface-2: #152036;
  --line: #22304a;
  --line-soft: #1a263c;
  --text: #e8edf5;
  --muted: #93a1b8;
  --faint: #66748c;
  --accent: #4cf0a6;
  --accent-2: #18c3e8;
  --solar: #ffc23c;
  --grad: linear-gradient(120deg, #5cf2a6 0%, #18c3e8 100%);
  --grad-solar: linear-gradient(120deg, #ffd25c 0%, #ff9a1a 100%);
  --radius: 18px;
  --radius-sm: 10px;
  --max: 1200px;
  --font-head: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.12; margin: 0 0 0.5em; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .container { padding: 0 16px; } }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--grad); border-radius: 2px; }

.lead { font-size: clamp(1.05rem, 1.6vw, 1.2rem); color: var(--muted); max-width: 640px; }

/* ---------------------------------------------------------------- Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 999px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--grad); color: #03140d; box-shadow: 0 10px 30px -10px rgba(40, 210, 190, 0.6); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -12px rgba(40, 210, 190, 0.75); }
.btn-ghost { border-color: var(--line); color: var(--text); background: rgba(255, 255, 255, 0.02); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------------------------------------------------------------- Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(6, 12, 21, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line-soft);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.brand img { height: 34px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav-links .btn { padding: 10px 18px; margin-left: 8px; color: #03140d; }
.nav-links .btn:hover, .nav-links .btn[aria-current="page"] { color: #03140d; background: var(--grad); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  width: 44px;
  height: 44px;
  color: var(--text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    background: rgba(6, 12, 21, 0.97);
    border-bottom: 1px solid var(--line-soft);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-links .btn { margin: 8px 0 0; justify-content: center; }
}

/* ---------------------------------------------------------------- Hero */
.hero { position: relative; padding: 96px 0 80px; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: 900px;
  height: 900px;
  background: radial-gradient(closest-side, rgba(40, 220, 180, 0.18), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 65%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 65%);
  pointer-events: none;
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.hero h1 { margin-bottom: 24px; }
.hero .lead { margin-bottom: 36px; }
.hero-visual { position: relative; aspect-ratio: 1 / 1; }
.hero-visual img { position: absolute; filter: drop-shadow(0 30px 40px rgba(0, 0, 0, 0.5)); }
.hero-visual .hv-1 { width: 78%; left: 0; top: 4%; }
.hero-visual .hv-2 { width: 56%; right: -4%; bottom: 0; }
.hero-visual .hv-ring {
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  border: 1px dashed rgba(76, 240, 166, 0.25);
  animation: spin 60s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero-stats { display: flex; flex-wrap: wrap; gap: 28px 40px; margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--line-soft); }
.hero-stats div strong { display: block; font-family: var(--font-head); font-size: 1.9rem; font-weight: 700; }
.hero-stats div span { color: var(--muted); font-size: 0.9rem; }

@media (max-width: 900px) {
  .hero { padding: 56px 0 56px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { max-width: 460px; width: 100%; margin: 0 auto; }
}

/* ---------------------------------------------------------------- Sections */
section { padding: 96px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; flex-wrap: wrap; margin-bottom: 48px; }
.section-head h2 { margin: 0; max-width: 680px; }
.section-head p { margin: 12px 0 0; }
.alt { background: var(--bg-2); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
@media (max-width: 600px) { section { padding: 64px 0; } }

/* Feature cards */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature {
  padding: 28px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line-soft);
  transition: border-color 0.25s, transform 0.25s;
}
.feature:hover { border-color: rgba(76, 240, 166, 0.4); transform: translateY(-4px); }
.feature .icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(76, 240, 166, 0.1);
  color: var(--accent);
  margin-bottom: 20px;
}
.feature .icon svg { width: 24px; height: 24px; }
.feature p { color: var(--muted); margin: 0; font-size: 0.95rem; }
@media (max-width: 1000px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .features { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- Product cards */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.chip {
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font: 500 0.92rem var(--font-body);
  cursor: pointer;
  transition: all 0.2s;
}
.chip:hover { color: var(--text); border-color: var(--muted); }
.chip[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }

.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 22px; }
.product-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.product-card:hover { transform: translateY(-6px); border-color: rgba(76, 240, 166, 0.45); box-shadow: var(--shadow); }
.product-card .media {
  aspect-ratio: 6 / 5;
  background: radial-gradient(circle at 50% 35%, #1c2a46, #0b1220 75%);
  display: grid;
  place-items: center;
  position: relative;
}
.product-card .media img { width: 92%; transition: transform 0.4s ease; }
.product-card:hover .media img { transform: scale(1.04); }
.product-card .badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(6, 12, 21, 0.7);
  border: 1px solid var(--line);
  color: var(--muted);
}
.product-card .body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.product-card .model { font-family: var(--font-head); font-size: 0.85rem; color: var(--accent); font-weight: 600; letter-spacing: 0.06em; }
.product-card h3 { margin: 4px 0 8px; font-size: 1.15rem; }
.product-card p { color: var(--muted); font-size: 0.92rem; margin-bottom: 18px; }
.mini-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line-soft); }
.mini-specs div span { display: block; font-size: 0.72rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.06em; }
.mini-specs div strong { font-family: var(--font-head); font-size: 0.98rem; font-weight: 600; }

/* ---------------------------------------------------------------- Comparison table */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line-soft); background: var(--surface); }
.compare { width: 100%; border-collapse: collapse; min-width: 640px; }
.compare th, .compare td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line-soft); font-size: 0.95rem; }
.compare thead th { font-family: var(--font-head); font-size: 0.85rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); background: var(--surface-2); }
.compare thead th.hl { color: var(--accent); }
.compare td.hl { background: rgba(76, 240, 166, 0.06); font-weight: 600; }
.compare tbody tr:last-child td { border-bottom: 0; }
.compare td:first-child { color: var(--muted); }
.note { font-size: 0.82rem; color: var(--faint); margin-top: 14px; }

/* ---------------------------------------------------------------- Applications */
.apps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.app {
  position: relative;
  padding: 32px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  overflow: hidden;
}
.app .num { font-family: var(--font-head); font-size: 0.85rem; color: var(--accent); font-weight: 600; }
.app h3 { margin: 10px 0 8px; }
.app p { color: var(--muted); margin: 0; font-size: 0.95rem; }
@media (max-width: 900px) { .apps { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- CTA */
.cta {
  position: relative;
  border-radius: 28px;
  padding: 64px;
  overflow: hidden;
  background: linear-gradient(135deg, #061a16 0%, #0a1626 50%, #0f1729 100%);
  border: 1px solid rgba(76, 240, 166, 0.25);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}
.cta::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  right: -120px;
  top: -200px;
  background: radial-gradient(closest-side, rgba(40, 220, 180, 0.28), transparent);
}
.cta > * { position: relative; }
.cta h2 { margin: 0 0 8px; }
.cta p { color: var(--muted); margin: 0; max-width: 560px; }
@media (max-width: 600px) { .cta { padding: 36px 24px; } }

/* ---------------------------------------------------------------- Page header */
.page-hero { padding: 72px 0 40px; position: relative; overflow: hidden; }
.page-hero::before {
  content: "";
  position: absolute;
  inset: -200px -200px auto auto;
  width: 700px;
  height: 700px;
  background: radial-gradient(closest-side, rgba(40, 220, 180, 0.12), transparent);
  pointer-events: none;
}
.page-hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
.breadcrumb { font-size: 0.88rem; color: var(--faint); margin-bottom: 20px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }

/* ---------------------------------------------------------------- Product detail */
.pd { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: start; padding-bottom: 40px; }
.pd-gallery { position: sticky; top: 96px; }
.pd-main {
  aspect-ratio: 6 / 5;
  border-radius: 24px;
  background: radial-gradient(circle at 50% 35%, #1c2a46, #0b1220 75%);
  border: 1px solid var(--line-soft);
  display: grid;
  place-items: center;
}
.pd-main img { width: 90%; }
.pd-thumbs { display: flex; gap: 12px; margin-top: 12px; }
.pd-thumbs button {
  width: 88px;
  aspect-ratio: 6 / 5;
  padding: 4px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  cursor: pointer;
}
.pd-thumbs button[aria-current="true"] { border-color: var(--accent); }
.pd-info .model { font-family: var(--font-head); color: var(--accent); font-weight: 600; letter-spacing: 0.08em; }
.pd-info h1 { font-size: clamp(2rem, 4vw, 2.9rem); margin: 6px 0 14px; }
.pd-info .lead { margin-bottom: 28px; }
.highlights { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 28px; }
.highlights div { padding: 18px 20px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line-soft); }
.highlights span { display: block; font-size: 0.75rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em; }
.highlights strong { font-family: var(--font-head); font-size: 1.45rem; font-weight: 700; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 28px; padding: 0; list-style: none; }
.tags li { padding: 6px 12px; border-radius: 999px; background: rgba(24, 195, 232, 0.08); color: var(--accent-2); font-size: 0.85rem; border: 1px solid rgba(24, 195, 232, 0.2); }
@media (max-width: 900px) {
  .pd { grid-template-columns: 1fr; gap: 32px; }
  .pd-gallery { position: static; }
}

.spec-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.spec-group { border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line-soft); overflow: hidden; }
.spec-group h3 { margin: 0; padding: 16px 22px; font-size: 0.85rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); background: var(--surface-2); border-bottom: 1px solid var(--line-soft); }
.spec-group table { width: 100%; border-collapse: collapse; }
.spec-group th, .spec-group td { padding: 12px 22px; text-align: left; vertical-align: top; font-size: 0.93rem; border-bottom: 1px solid var(--line-soft); }
.spec-group tr:last-child th, .spec-group tr:last-child td { border-bottom: 0; }
.spec-group th { font-weight: 400; color: var(--muted); width: 48%; }
.spec-group td { font-weight: 500; }
@media (max-width: 800px) { .spec-groups { grid-template-columns: 1fr; } }

/* Capacity vs temperature chart */
.chart-card { border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line-soft); padding: 28px; margin-top: 20px; }
.chart-card h3 { margin-bottom: 4px; }
.chart-card .sub { color: var(--muted); font-size: 0.9rem; margin-bottom: 18px; }
.temp-chart { width: 100%; height: auto; overflow: visible; }
.temp-chart .bar { fill: var(--accent); transition: opacity 0.15s; }
.temp-chart .bar.alt { fill: var(--solar); }
.temp-chart .hit { fill: transparent; cursor: default; }
.temp-chart .hit:hover + .bar, .temp-chart g:hover .bar { opacity: 0.8; }
.temp-chart text { fill: var(--muted); font: 12px var(--font-body); }
.temp-chart .val { fill: var(--text); font-weight: 600; }
.temp-chart .grid { stroke: var(--line-soft); stroke-width: 1; }
.temp-chart .axis { stroke: var(--line); stroke-width: 1; }
.chart-tip {
  position: fixed;
  pointer-events: none;
  padding: 8px 12px;
  border-radius: 10px;
  background: #0b1220;
  border: 1px solid var(--line);
  font-size: 0.85rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.12s;
  z-index: 100;
}
.chart-legend { display: flex; gap: 18px; font-size: 0.82rem; color: var(--muted); margin-top: 10px; }
.chart-legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; background: var(--accent); }
.chart-legend span.alt::before { background: var(--solar); }

/* ---------------------------------------------------------------- Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 56px; align-items: start; }
.contact-points { list-style: none; padding: 0; margin: 32px 0 0; display: grid; gap: 20px; }
.contact-points li { display: flex; gap: 16px; }
.contact-points .icon { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: rgba(76, 240, 166, 0.1); color: var(--accent); }
.contact-points .icon svg { width: 20px; height: 20px; }
.contact-points strong { display: block; font-family: var(--font-head); }
.contact-points span { color: var(--muted); font-size: 0.93rem; }

.form-card { padding: 36px; border-radius: 24px; background: var(--surface); border: 1px solid var(--line-soft); box-shadow: var(--shadow); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
.field label { font-size: 0.88rem; font-weight: 500; color: var(--muted); }
.field label .req { color: var(--accent); }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text);
  font: 400 1rem var(--font-body);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px rgba(76, 240, 166, 0.15); }
.field select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2393a1b8' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; background-size: 18px; padding-right: 44px; }
.check-group { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.check-group label {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  font-size: 0.9rem;
  line-height: 1.3;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.check-group label:hover { border-color: var(--muted); color: var(--text); }
.field .check-group input {
  flex: none;
  width: 18px;
  height: 18px;
  margin: 0;
  padding: 0;
  border: 0;
  box-shadow: none;
  accent-color: var(--accent);
  cursor: pointer;
}
.check-group label:has(input:checked) { border-color: var(--accent); color: var(--text); background: rgba(76, 240, 166, 0.08); }
.check-group label:has(input:focus-visible) { box-shadow: 0 0 0 3px rgba(76, 240, 166, 0.25); }
@media (max-width: 400px) { .check-group { grid-template-columns: 1fr; } }
.form-status { margin-top: 16px; padding: 14px 18px; border-radius: 12px; font-size: 0.95rem; display: none; }
.form-status.ok { display: block; background: rgba(24, 195, 232, 0.1); border: 1px solid rgba(24, 195, 232, 0.3); color: var(--accent-2); }
.form-status.err { display: block; background: rgba(255, 90, 90, 0.1); border: 1px solid rgba(255, 90, 90, 0.3); color: #ff9a9a; }
.form-card .btn { width: 100%; justify-content: center; }
.form-card .btn[disabled] { opacity: 0.6; cursor: wait; }
.fine { font-size: 0.8rem; color: var(--faint); margin: 14px 0 0; text-align: center; }
.hp { position: absolute; left: -9999px; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; gap: 0; } .form-card { padding: 24px 18px; } }

/* ---------------------------------------------------------------- Prose / tech */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split .visual { border-radius: 24px; background: radial-gradient(circle at 50% 35%, #1c2a46, #0b1220 75%); border: 1px solid var(--line-soft); padding: 24px; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 32px; } }
.checklist { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 14px; }
.checklist li { display: flex; gap: 12px; color: var(--muted); }
.checklist li::before {
  content: "";
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border-radius: 50%;
  background: rgba(76, 240, 166, 0.12) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234cf0a6' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12 5 5 9-10'/%3E%3C/svg%3E") center / 13px no-repeat;
}
.checklist li strong { color: var(--text); }

.stat-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-soft); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line-soft); }
.stat-strip div { background: var(--surface); padding: 28px 24px; }
.stat-strip strong { display: block; font-family: var(--font-head); font-size: 2.2rem; font-weight: 700; line-height: 1.1; }
.stat-strip span { color: var(--muted); font-size: 0.9rem; }
@media (max-width: 800px) { .stat-strip { grid-template-columns: 1fr 1fr; } }

/* ---------------------------------------------------------------- Footer */
.site-footer { border-top: 1px solid var(--line-soft); padding: 64px 0 32px; background: var(--bg-2); margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer-grid img { height: 32px; width: auto; margin-bottom: 16px; }
.footer-grid p { color: var(--muted); font-size: 0.92rem; max-width: 320px; }
.footer-grid h4 { font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); margin-bottom: 16px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-grid ul a { color: var(--muted); font-size: 0.93rem; }
.footer-grid ul a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line-soft); color: var(--faint); font-size: 0.85rem; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-grid > :first-child { grid-column: 1 / -1; } }

/* ---------------------------------------------------------------- Reveal on scroll */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-visual .hv-ring { animation: none; }
  * { transition-duration: 0.01ms !important; }
}

.empty { padding: 80px 0; text-align: center; color: var(--muted); }

/* ---------------------------------------------------------------- Energy-flow diagram (hero) */
.flow { position: relative; }
.flow svg { width: 100%; height: auto; overflow: visible; }
.flow .wire { stroke: var(--line); stroke-width: 3; fill: none; stroke-linecap: round; }
.flow .pulse { fill: none; stroke: var(--accent); stroke-width: 3.5; stroke-linecap: round; stroke-dasharray: 2 16; opacity: 0; transition: opacity 0.4s; animation: flow 0.9s linear infinite; }
.flow .pulse.solar { stroke: var(--solar); }
.flow .pulse.on { opacity: 1; }
.flow .pulse.rev { animation-direction: reverse; }
@keyframes flow { to { stroke-dashoffset: -18; } }
.flow .node .bg { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; transition: stroke 0.4s, fill 0.4s; }
.flow .node.on .bg { stroke: var(--accent); fill: #0d2027; }
.flow .node.sun.on .bg { stroke: var(--solar); fill: #221c0c; }
.flow .node.down .bg { stroke: #ff6b6b; fill: #2a1116; }
.flow .node .ico { fill: none; stroke: var(--text); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.flow .node text { fill: var(--muted); font: 600 13px var(--font-head); letter-spacing: 0.08em; text-transform: uppercase; }
.flow .node .val { fill: var(--text); font: 700 15px var(--font-head); letter-spacing: 0; text-transform: none; }
.flow .hub .bg { fill: #0b1a24; stroke: url(#flowGrad); stroke-width: 3; }
.flow .hub .ring { fill: none; stroke: var(--accent); stroke-opacity: 0.25; stroke-dasharray: 3 7; animation: spin 30s linear infinite; transform-origin: 240px 240px; }
.flow .grid-x { stroke: #ff6b6b; stroke-width: 4; stroke-linecap: round; opacity: 0; transition: opacity 0.3s; }
.flow.outage .grid-x { opacity: 1; }
.flow-status {
  display: flex; align-items: center; gap: 12px;
  margin: 8px auto 0; padding: 12px 18px; max-width: 420px;
  border-radius: 14px; background: var(--surface); border: 1px solid var(--line-soft);
  font-size: 0.92rem; color: var(--muted);
}
.flow-status strong { color: var(--text); font-family: var(--font-head); }
.flow-status .dot { flex: none; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(76, 240, 166, 0.15); }
.flow.outage + .flow-status .dot { background: #ff6b6b; box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.18); }
.flow-modes { display: flex; justify-content: center; gap: 6px; margin-top: 14px; flex-wrap: wrap; }
.flow-modes .chip { padding: 7px 14px; font-size: 0.85rem; }
.flow-modes .chip[aria-pressed="true"] { background: var(--text); color: var(--bg); }

/* ---------------------------------------------------------------- Pillars */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pillar { padding: 32px 28px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line-soft); position: relative; overflow: hidden; }
.pillar::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: var(--grad); }
.pillar.sun::before { background: var(--grad-solar); }
.pillar .icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; background: rgba(76, 240, 166, 0.1); color: var(--accent); margin-bottom: 20px; }
.pillar.sun .icon { background: rgba(255, 194, 60, 0.12); color: var(--solar); }
.pillar .icon svg { width: 26px; height: 26px; }
.pillar p { color: var(--muted); font-size: 0.95rem; }
.pillar ul { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; font-size: 0.92rem; }
.pillar li { padding-left: 18px; position: relative; color: var(--text); }
.pillar li::before { content: ""; position: absolute; left: 0; top: 0.65em; width: 8px; height: 2px; background: var(--accent); }
.pillar.sun li::before { background: var(--solar); }
@media (max-width: 900px) { .pillars { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- Load tiers */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tier { padding: 28px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line-soft); }
.tier .lvl { display: inline-block; padding: 4px 12px; border-radius: 999px; font: 600 0.75rem var(--font-head); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 14px; }
.tier.t1 .lvl { background: rgba(76, 240, 166, 0.12); color: var(--accent); }
.tier.t2 .lvl { background: rgba(24, 195, 232, 0.12); color: var(--accent-2); }
.tier.t3 .lvl { background: rgba(255, 194, 60, 0.12); color: var(--solar); }
.tier p { color: var(--muted); font-size: 0.95rem; }
.tier .eg { font-size: 0.88rem; color: var(--faint); margin: 0; }
@media (max-width: 900px) { .tiers { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- Backup calculator */
.calc { display: grid; grid-template-columns: 1.1fr 1fr; gap: 0; border-radius: 24px; overflow: hidden; border: 1px solid var(--line-soft); background: var(--surface); }
.calc-inputs { padding: 36px; display: grid; gap: 26px; }
.calc-inputs label { display: flex; justify-content: space-between; gap: 12px; font-size: 0.92rem; color: var(--muted); margin-bottom: 10px; }
.calc-inputs label output { color: var(--text); font: 700 1rem var(--font-head); }
.calc-inputs input[type="range"] { width: 100%; accent-color: var(--accent); }
.calc-inputs .hint { font-size: 0.8rem; color: var(--faint); margin: 6px 0 0; }
.calc-result { padding: 36px; background: radial-gradient(circle at 70% 20%, rgba(76, 240, 166, 0.12), transparent 60%), var(--surface-2); border-left: 1px solid var(--line-soft); display: flex; flex-direction: column; justify-content: center; }
.calc-result .big { font: 700 clamp(2.6rem, 6vw, 3.6rem) var(--font-head); line-height: 1; margin: 6px 0 10px; }
.calc-result p { color: var(--muted); margin: 0 0 8px; font-size: 0.95rem; }
.calc-result .verdict { margin-top: 14px; padding: 12px 16px; border-radius: 12px; background: rgba(76, 240, 166, 0.08); border: 1px solid rgba(76, 240, 166, 0.25); color: var(--text); font-size: 0.92rem; }
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } .calc-result { border-left: 0; border-top: 1px solid var(--line-soft); } .calc-inputs, .calc-result { padding: 26px 20px; } }

/* ---------------------------------------------------------------- Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { padding: 28px 24px; border-radius: var(--radius); border: 1px dashed var(--line); position: relative; }
.step::before { counter-increment: step; content: "0" counter(step); font: 700 0.9rem var(--font-head); color: var(--accent); display: block; margin-bottom: 10px; }
.step p { color: var(--muted); margin: 0; font-size: 0.93rem; }
@media (max-width: 1000px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

.compare td.no { color: var(--faint); }
.compare td.yes { color: var(--text); }
.hero-visual-flow { width: 100%; max-width: 500px; margin-left: auto; }
@media (max-width: 900px) { .hero-visual-flow { margin: 0 auto; } }
.pd > * { min-width: 0; }
.pd-thumbs { flex-wrap: wrap; }
@media (max-width: 560px) { .pd-thumbs button { width: calc(25% - 9px); } }