/* ────────────────────────────────────────────────────────────────────────
   Heat Pump Dashboard — landing page styles (scaffolding)
   No build step, no framework. Modern CSS only.
   Edit this single file to restyle EN / CS / PL pages at once.
   ──────────────────────────────────────────────────────────────────────── */

:root {
  --color-text: #0f172a;
  --color-text-soft: #475569;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --color-primary: #0f4c81;
  --color-primary-hover: #0a3a63;
  --color-accent: #f97316;
  --max-width: 1120px;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header / nav ──────────────────────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
}

.brand-logo {
  height: 56px;
  width: auto;
  display: block;
}

@media (max-width: 600px) {
  .brand-logo {
    height: 44px;
  }
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text-soft);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switch {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}

.lang-switch a {
  color: var(--color-text-soft);
  text-decoration: none;
}

.lang-switch a.active {
  color: var(--color-text);
  font-weight: 600;
}

/* ── Buttons ───────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 15px;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: #fff;
  color: var(--color-primary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-alt);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-soft);
}

.btn-ghost:hover {
  color: var(--color-text);
}

.btn-large {
  padding: 14px 28px;
  font-size: 17px;
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ── Hero ──────────────────────────────────────────────────────────────── */

.hero {
  padding: 64px 0 60px;
}

.hero-headline {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 0 0 20px;
}

.hero-headline h1 {
  margin: 0;
  flex: 1 1 0;
  min-width: 0;
}

.hero-logo {
  margin: 0;
  flex: 0 0 auto;
}

.hero-logo img {
  height: 200px;
  width: auto;
  display: block;
}

@media (max-width: 600px) {
  .hero-headline {
    gap: 16px;
  }
  .hero-logo img {
    height: clamp(56px, 14vw, 72px);
  }
}

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}

.hero .lede {
  font-size: 19px;
  color: var(--color-text-soft);
  max-width: 720px;
  margin: 0 0 32px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-screenshot {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-alt);
  box-shadow: 0 20px 40px -20px rgba(15, 23, 42, 0.15);
}

.hero-screenshot img {
  width: 100%;
}

/* ── Who-it's-for strip ────────────────────────────────────────────────── */

.who {
  background: var(--color-bg-alt);
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.who p {
  text-align: center;
  font-size: 17px;
  margin: 0;
  color: var(--color-text-soft);
}

.who strong {
  color: var(--color-text);
}

/* ── Features ──────────────────────────────────────────────────────────── */

.features {
  padding: 80px 0;
}

.features h2,
.how h2,
.screenshots h2,
.pricing h2,
.faq h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 48px;
  text-align: center;
  letter-spacing: -0.01em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.feature-card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.feature-card .icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 18px;
  margin: 0 0 8px;
}

.feature-card p {
  color: var(--color-text-soft);
  margin: 0;
}

/* ── How it works ──────────────────────────────────────────────────────── */

.how {
  padding: 80px 0;
  background: var(--color-bg-alt);
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.steps li {
  background: #fff;
  padding: 28px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  margin-bottom: 16px;
}

.steps h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.steps p {
  color: var(--color-text-soft);
  margin: 0;
}

/* ── Screenshots ───────────────────────────────────────────────────────── */

.screenshots {
  padding: 80px 0;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.screenshot-grid figure {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-alt);
}

.screenshot-grid img {
  width: 100%;
  display: block;
}

.screenshot-grid figcaption {
  padding: 14px 16px;
  font-size: 14px;
  color: var(--color-text-soft);
  border-top: 1px solid var(--color-border);
  background: #fff;
}

/* ── Pricing ───────────────────────────────────────────────────────────── */

.pricing {
  padding: 80px 0;
  background: var(--color-bg-alt);
}

.price-card {
  max-width: 460px;
  margin: 0 auto;
  padding: 40px 32px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  text-align: center;
  background: #fff;
  box-shadow: 0 20px 40px -20px rgba(15, 76, 129, 0.25);
}

.price-card h3 {
  margin: 0 0 16px;
  font-size: 22px;
}

.price {
  margin: 0 0 24px;
}

.price-amount {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.price-period {
  color: var(--color-text-soft);
  margin-left: 6px;
}

.price-features {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  text-align: left;
}

.price-features li {
  padding: 8px 0 8px 28px;
  position: relative;
  border-top: 1px solid var(--color-border);
}

.price-features li:first-child {
  border-top: 0;
}

.price-features li::before {
  content: "✓";
  color: var(--color-primary);
  font-weight: 700;
  position: absolute;
  left: 4px;
}

.fine-print {
  font-size: 13px;
  color: var(--color-text-soft);
  margin: 16px 0 0;
}

/* ── FAQ ───────────────────────────────────────────────────────────────── */

.faq {
  padding: 80px 0;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq details {
  margin-bottom: 12px;
  padding: 16px 20px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.faq summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-text-soft);
  transition: transform 0.15s ease;
}

.faq details[open] summary::after {
  content: "−";
}

.faq details[open] summary {
  margin-bottom: 12px;
}

.faq p {
  margin: 0;
  color: var(--color-text-soft);
}

/* ── Footer ────────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  align-items: center;
  justify-content: space-between;
}

.site-footer .copy {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 14px;
}

.footer-links,
.footer-langs {
  display: flex;
  gap: 16px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
}

.footer-links a,
.footer-langs a {
  color: var(--color-text-soft);
  text-decoration: none;
}

.footer-links a:hover,
.footer-langs a:hover {
  color: var(--color-text);
}

.footer-langs a.active {
  color: var(--color-text);
  font-weight: 600;
}

/* ── Legal pages (privacy / terms / refunds) ──────────────────────────── */
/*
   Single-column readable layout. Narrower than the marketing pages — long
   prose is easier to read at ~720px. Heading hierarchy is calmer here than
   in the hero/feature sections.
*/

.legal-page {
  padding: 56px 0 80px;
}

.legal {
  max-width: 760px;
}

.legal h1 {
  font-size: clamp(28px, 4vw, 36px);
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.legal .legal-meta {
  color: var(--color-text-soft);
  font-size: 14px;
  margin: 0 0 32px;
}

.legal h2 {
  font-size: 20px;
  margin: 36px 0 12px;
  letter-spacing: -0.005em;
}

.legal p {
  margin: 0 0 16px;
}

.legal ul,
.legal ol {
  margin: 0 0 16px;
  padding-left: 24px;
}

.legal li {
  margin-bottom: 8px;
}

.legal code {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.92em;
}

.legal a {
  color: var(--color-primary);
}

/* ── Lightbox (click-to-enlarge screenshots) ──────────────────────────── */

.zoomable {
  cursor: zoom-in;
  transition: transform 0.15s ease;
}

.zoomable:hover {
  transform: scale(1.005);
}

dialog#lightbox {
  border: 0;
  padding: 0;
  background: transparent;
  margin: auto;
  max-width: 100vw;
  max-height: 100vh;
  overflow: visible;
}

dialog#lightbox::backdrop {
  background: rgba(15, 23, 42, 0.92);
}

dialog#lightbox img {
  display: block;
  max-width: min(96vw, 1600px);
  max-height: 92vh;
  border-radius: 8px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
  cursor: zoom-out;
}

/* ── Responsive ────────────────────────────────────────────────────────── */

@media (max-width: 820px) {
  .nav-links {
    display: none;
  }
  .nav-actions {
    gap: 12px;
  }
  .nav-actions .btn-secondary {
    display: none;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 48px 0 32px;
  }
  .hero-cta {
    margin-bottom: 36px;
  }
  .features,
  .how,
  .screenshots,
  .pricing,
  .faq {
    padding: 56px 0;
  }
  .features h2,
  .how h2,
  .screenshots h2,
  .pricing h2,
  .faq h2 {
    margin-bottom: 32px;
  }
}