/* =========================================================
   Green Heat Wales — Solar Panel Cleaning page
   base.css (reset) + design tokens + components
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li, figcaption { text-wrap: pretty; }

::selection { background: color-mix(in oklab, var(--color-primary) 25%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

a, button, [role="button"], input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

/* ---------- Design tokens ---------- */
:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 4.5rem);

  /* Spacing (4px system) */
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem; --space-32: 8rem;

  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem; --radius-xl: 1.25rem; --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px; --content-default: 960px; --content-wide: 1200px;

  --font-display: 'Cabinet Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Satoshi', 'Segoe UI', sans-serif;
}

:root, [data-theme='light'] {
  --color-bg: #fbfaf6;
  --color-surface: #ffffff;
  --color-surface-2: #f4f6f0;
  --color-surface-offset: #edf1e7;
  --color-divider: #e3e8dc;
  --color-border: #d6ddcc;

  --color-text: #1c2418;
  --color-text-muted: #56604f;
  --color-text-faint: #95a08b;
  --color-text-inverse: #fbfaf6;

  --color-primary: #2f8f42;
  --color-primary-hover: #23723350;
  --color-primary-hover: #237233;
  --color-primary-active: #1a5726;
  --color-primary-highlight: #e0f0e1;

  --color-accent: #dd8f28;
  --color-accent-hover: #bd7818;
  --color-accent-highlight: #f7e7cc;

  --color-error: #b3402c;
  --color-error-highlight: #f3ddd6;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 140 / 0.06);
  --shadow-md: 0 6px 20px oklch(0.2 0.02 140 / 0.10);
  --shadow-lg: 0 20px 48px oklch(0.2 0.02 140 / 0.16);
}

[data-theme='dark'] {
  --color-bg: #10140d;
  --color-surface: #161b11;
  --color-surface-2: #1b2115;
  --color-surface-offset: #1f2618;
  --color-divider: #29321f;
  --color-border: #313b26;

  --color-text: #e7ecdf;
  --color-text-muted: #a2ac96;
  --color-text-faint: #667059;
  --color-text-inverse: #16200f;

  --color-primary: #57bb6a;
  --color-primary-hover: #6ecb80;
  --color-primary-active: #4a9e59;
  --color-primary-highlight: #223424;

  --color-accent: #f0a94a;
  --color-accent-hover: #f6bc6c;
  --color-accent-highlight: #3a2f1c;

  --color-error: #dd7a63;
  --color-error-highlight: #3a2420;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 20px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 20px 48px oklch(0 0 0 / 0.5);
}

/* ---------- Layout helpers ---------- */
.wrap { max-width: var(--content-wide); margin-inline: auto; padding-inline: var(--space-6); }
.wrap--narrow { max-width: var(--content-default); }
section { padding-block: clamp(var(--space-16), 8vw, var(--space-24)); }

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--color-primary);
}
.eyebrow::before { content: ''; width: 18px; height: 2px; background: var(--color-primary); border-radius: var(--radius-full); }

h2.section-title { font-size: var(--text-xl); font-weight: 700; margin-block: var(--space-3) var(--space-4); max-width: 40ch; }
p.section-lead { font-size: var(--text-base); color: var(--color-text-muted); max-width: 60ch; }
.vat-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-3);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: color-mix(in oklab, var(--color-primary) 12%, transparent);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); min-height: 76px; }

.brand { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; color: inherit; min-width: 0; }
.brand-mark { width: 36px; height: 36px; flex-shrink: 0; color: var(--color-primary); }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: var(--text-base); }
.brand-name b { color: var(--color-primary); }
.brand-tagline { font-size: var(--text-xs); color: var(--color-text-muted); letter-spacing: 0.02em; }

.header-right { display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0; }
.header-phones { display: none; }
.header-phones a { color: var(--color-text-muted); font-size: var(--text-sm); text-decoration: none; }
.header-phones a:hover { color: var(--color-primary); }
.header-divider-dot { color: var(--color-text-faint); }
.site-header .header-cta { display: none; }

@media (min-width: 860px) {
  .header-phones { display: flex; align-items: center; gap: var(--space-2); }
}
@media (min-width: 600px) {
  .site-header .header-cta { display: inline-flex; }
}

.theme-toggle {
  width: 40px; height: 40px; border-radius: var(--radius-full);
  display: grid; place-items: center; border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.theme-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600; padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full); text-decoration: none; white-space: nowrap;
  border: 1px solid transparent;
}
.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { border-color: var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ---------- Hero ---------- */
.hero { position: relative; padding-block: 0; overflow: hidden; }
.hero-media { position: relative; min-height: min(78vh, 720px); display: flex; align-items: flex-end; }
.hero-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 70% 55%; }
.hero-scrim {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, oklch(0.12 0.03 150 / 0.15) 0%, oklch(0.1 0.03 150 / 0.55) 62%, oklch(0.08 0.03 150 / 0.82) 100%);
}
.hero-content { position: relative; z-index: 1; padding-block: var(--space-20) var(--space-16); color: #fdfcf8; width: 100%; }
.hero-content .wrap { max-width: var(--content-default); }
.hero-content h1 { font-size: var(--text-3xl); font-weight: 700; max-width: 16ch; margin-block: var(--space-4); }
.hero-content .eyebrow { color: #d8f0d9; }
.hero-content .eyebrow::before { background: #d8f0d9; }
.hero-content p.lead { font-size: var(--text-lg); max-width: 52ch; color: #eef3e8; font-weight: 400; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); margin-top: var(--space-8); }
.hero-call { color: #fdfcf8; text-decoration: none; font-size: var(--text-sm); font-weight: 600; border-bottom: 1px solid color-mix(in oklab, #fff 40%, transparent); padding-bottom: 2px; }
.hero-call:hover { border-color: #fff; }

/* ---------- Stat / cause strip ---------- */
.cause-grid {
  display: grid; gap: var(--space-4); grid-template-columns: repeat(2, 1fr); margin-top: var(--space-10);
}
@media (min-width: 720px) { .cause-grid { grid-template-columns: repeat(3, 1fr); } }
.cause-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  background: var(--color-surface); border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg); padding: var(--space-4);
}
.cause-item svg { flex-shrink: 0; width: 22px; height: 22px; color: var(--color-primary); margin-top: 2px; }
.cause-item span { font-size: var(--text-sm); color: var(--color-text); }

.why-layout { display: grid; gap: var(--space-12); grid-template-columns: 1fr; align-items: start; }
@media (min-width: 960px) { .why-layout { grid-template-columns: 1.1fr 0.9fr; } }

.stat-card {
  background: linear-gradient(160deg, var(--color-primary-highlight), var(--color-surface));
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl); padding: var(--space-8);
  display: flex; flex-direction: column; gap: var(--space-2);
}
.stat-card .stat-figure { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 700; color: var(--color-primary); }
.stat-card p { color: var(--color-text-muted); font-size: var(--text-sm); }

/* ---------- Process steps ---------- */
.process-grid { display: grid; gap: var(--space-6); grid-template-columns: 1fr; margin-top: var(--space-10); }
@media (min-width: 720px) { .process-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .process-grid { grid-template-columns: repeat(4, 1fr); } }

.process-card {
  background: var(--color-surface); border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg); padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-3);
}
.process-number {
  width: 34px; height: 34px; border-radius: var(--radius-full);
  background: var(--color-primary-highlight); color: var(--color-primary);
  display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; font-size: var(--text-sm);
}
.process-card h3 { font-size: var(--text-base); font-weight: 700; font-family: var(--font-body); }
.process-card p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Access cards ---------- */
.access-grid { display: grid; gap: var(--space-8); grid-template-columns: 1fr; margin-top: var(--space-10); }
@media (min-width: 860px) { .access-grid { grid-template-columns: repeat(2, 1fr); } }

.access-card {
  background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-xl);
  overflow: hidden; display: flex; flex-direction: column; box-shadow: var(--shadow-sm);
}
.access-card figure { background: var(--color-surface-2); }
.access-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; padding: var(--space-4); }
.access-card-body { padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.access-card h3 { font-size: var(--text-lg); font-weight: 700; }
.access-card p { color: var(--color-text-muted); font-size: var(--text-sm); }
.access-price-row {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  border-top: 1px dashed var(--color-divider); padding-top: var(--space-3); margin-top: auto;
}
.access-price-row .label { font-size: var(--text-sm); color: var(--color-text); }
.access-price-row .price { font-family: var(--font-display); font-weight: 700; color: var(--color-accent); font-size: var(--text-base); }
.badge-free {
  display: inline-flex; align-self: flex-start; font-size: var(--text-xs); font-weight: 700;
  color: var(--color-primary); background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
}

/* ---------- Quote calculator ---------- */
.quote-section { background: var(--color-surface-2); border-top: 1px solid var(--color-divider); border-bottom: 1px solid var(--color-divider); }
.quote-panel {
  margin-top: var(--space-10);
  background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  display: grid; grid-template-columns: 1fr; overflow: hidden;
}
@media (min-width: 960px) { .quote-panel { grid-template-columns: 1.15fr 0.85fr; } }

.quote-form { padding: clamp(var(--space-6), 4vw, var(--space-10)); display: flex; flex-direction: column; gap: var(--space-6); }
.quote-summary {
  background: var(--color-text); color: var(--color-text-inverse);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  display: flex; flex-direction: column; gap: var(--space-5);
}
[data-theme='dark'] .quote-summary { background: var(--color-surface-offset); }

.field-group { display: flex; flex-direction: column; gap: var(--space-2); }
.field-group label { font-size: var(--text-sm); font-weight: 600; }
.field-hint { font-size: var(--text-xs); color: var(--color-text-muted); }

.quote-call-alt {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
}
.quote-call-alt-label { color: var(--color-text); font-weight: 600; }
.quote-call-alt a { color: var(--color-primary); text-decoration: none; font-weight: 600; }
.quote-call-alt a:hover { text-decoration: underline; }
.field-row { display: grid; gap: var(--space-4); grid-template-columns: 1fr; }
@media (min-width: 620px) { .field-row { grid-template-columns: 1fr 1fr; } }

input[type="text"], input[type="number"], input[type="email"], input[type="tel"] {
  width: 100%; padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-surface); color: var(--color-text); font-size: var(--text-base);
}
input:focus-visible { border-color: var(--color-primary); }
input.input-error { border-color: var(--color-error); }
.error-text { display: none; font-size: var(--text-xs); color: var(--color-error); }
.field-group.has-error .error-text { display: block; }
.field-group.has-error input { border-color: var(--color-error); }

fieldset { border: none; display: flex; flex-direction: column; gap: var(--space-3); }
legend { font-size: var(--text-sm); font-weight: 600; margin-bottom: var(--space-1); padding: 0; }

.access-option {
  display: flex; align-items: flex-start; gap: var(--space-3);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: var(--space-4); cursor: pointer;
}
.access-option:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-highlight); }
.access-option input { margin-top: 3px; accent-color: var(--color-primary); }
.access-option-text strong { display: block; font-size: var(--text-sm); }
.access-option-text span { font-size: var(--text-xs); color: var(--color-text-muted); }
.access-option-price { margin-left: auto; font-size: var(--text-sm); font-weight: 700; color: var(--color-accent); white-space: nowrap; }

.summary-title { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; color: color-mix(in oklab, var(--color-text-inverse) 65%, transparent); font-weight: 700; }
.summary-line { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-3); font-size: var(--text-sm); padding-block: var(--space-1); }
.summary-line span:first-child { color: color-mix(in oklab, var(--color-text-inverse) 78%, transparent); }
.summary-divider { border-top: 1px solid color-mix(in oklab, var(--color-text-inverse) 22%, transparent); margin-block: var(--space-2); }
.summary-total { display: flex; align-items: baseline; justify-content: space-between; }
.summary-total .amount { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 700; }
.summary-note { font-size: var(--text-xs); color: color-mix(in oklab, var(--color-text-inverse) 68%, transparent); }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); margin-top: var(--space-8); max-width: var(--content-default); }
.faq-item { border: 1px solid var(--color-divider); border-radius: var(--radius-lg); background: var(--color-surface); overflow: hidden; }
.faq-item summary {
  list-style: none; cursor: pointer; padding: var(--space-5) var(--space-6);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  font-weight: 600; font-size: var(--text-base);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .icon { flex-shrink: 0; width: 20px; height: 20px; color: var(--color-primary); transition: transform var(--transition-interactive); }
.faq-item[open] summary .icon { transform: rotate(45deg); }
.faq-item p { padding: 0 var(--space-6) var(--space-5); color: var(--color-text-muted); font-size: var(--text-sm); max-width: 68ch; }

/* ---------- Footer ---------- */
.site-footer { background: var(--color-text); color: color-mix(in oklab, var(--color-text-inverse) 92%, transparent); }
[data-theme='dark'] .site-footer { background: var(--color-surface); border-top: 1px solid var(--color-divider); }
.footer-grid { display: grid; gap: var(--space-10); grid-template-columns: 1fr; padding-block: var(--space-16); }
@media (min-width: 780px) { .footer-grid { grid-template-columns: 1.3fr 1fr 1fr; } }
.footer-brand p { color: color-mix(in oklab, var(--color-text-inverse) 68%, transparent); font-size: var(--text-sm); max-width: 42ch; margin-top: var(--space-3); }
.footer-heading { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; color: color-mix(in oklab, var(--color-text-inverse) 55%, transparent); margin-bottom: var(--space-3); }
.footer-list { display: flex; flex-direction: column; gap: var(--space-2); font-size: var(--text-sm); }
.footer-list a { color: inherit; text-decoration: none; color: color-mix(in oklab, var(--color-text-inverse) 82%, transparent); }
.footer-list a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid color-mix(in oklab, var(--color-text-inverse) 15%, transparent);
  padding-block: var(--space-6);
  display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: space-between;
  font-size: var(--text-xs); color: color-mix(in oklab, var(--color-text-inverse) 55%, transparent);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: var(--space-6); left: 50%; transform: translate(-50%, 12px);
  background: var(--color-text); color: var(--color-text-inverse);
  padding: var(--space-4) var(--space-6); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  font-size: var(--text-sm); opacity: 0; pointer-events: none; transition: opacity var(--transition-interactive), transform var(--transition-interactive);
  z-index: 100; max-width: min(90vw, 420px); text-align: center;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }