/* SolarERP landing page — no frameworks, no web fonts, system font stack. */

:root {
  --bg: #ffffff;
  --surface: #f2f7f5;
  --text: #1d2733;
  --muted: #4d5d6c;
  --border: #dbe5e1;
  --accent: #0f766e;        /* teal — primary brand color */
  --accent-dark: #0b5d57;
  --accent-soft: #d9f3ef;
  --link: #0c6b64;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1413;
    --surface: #16201e;
    --text: #e8edec;
    --muted: #a3b3af;
    --border: #25342f;
    --accent: #0f766e;
    --accent-dark: #14897f;
    --accent-soft: #11302c;
    --link: #5eead4;
  }
  /* Hero scene: darken sky and ground, dim the house wall and roof slightly;
     panels, inverter and battery keep their hardcoded readable colors. */
  .hero-svg .sky    { fill: #14233b; }
  .hero-svg .ground { fill: #1b3a2f; }
  .hero-svg .wall   { fill: #d6d0c2; }
  .hero-svg .roof   { fill: #4a586e; }
  .hero-svg .lbl    { fill: #d4dcda; }
}

* { box-sizing: border-box; }

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

h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; }
p { margin: 0 0 1em; }

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

:focus-visible {
  outline: 3px solid var(--accent-dark);
  outline-offset: 2px;
  border-radius: 2px;
}

.wrap {
  max-width: 1060px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  z-index: 10;
}
.skip-link:focus { left: 0; }

/* Header / nav — links wrap on narrow screens, so no JS menu is needed. */
.site-header { border-bottom: 1px solid var(--border); }

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  font-size: 1.3rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
}
.brand span { color: var(--accent-dark); }

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a { text-decoration: none; font-weight: 500; }
.nav-links a:hover { text-decoration: underline; }

/* Language switcher (EN <-> UK) */
.lang {
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 8px;
  text-decoration: none !important;
}
.lang:hover { border-color: var(--accent); }

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 8px;
}
.nav-cta:hover { background: var(--accent-dark); text-decoration: none !important; }

/* Hero — stacked on mobile (text first), two columns from 860px up. */
.hero {
  display: grid;
  gap: 40px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 56px;
}

@media (min-width: 860px) {
  .hero { grid-template-columns: 1.05fr 1fr; }
}

.hero-copy h1 {
  font-size: clamp(2rem, 5vw, 2.9rem);
  letter-spacing: -0.02em;
}

.subhead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 34em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: 1.6em;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 8px;
}
.btn:hover { background: var(--accent-dark); }

.link-secondary { font-weight: 500; }

.hero-svg { width: 100%; height: auto; display: block; }

/* Hero trust strip — short differentiators under the CTA. */
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: 1.6em 0 0;
  padding: 0;
}
.hero-trust li {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-dark);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 5px 13px;
}

/* Lifecycle — the full job, stage by stage. */
.lifecycle { padding: 56px 0; }
.lifecycle h2 { font-size: 1.7rem; }
.lifecycle-intro { color: var(--muted); max-width: 52em; margin-bottom: 1.8em; }

.lifecycle-steps {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
@media (min-width: 640px) {
  .lifecycle-steps { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 940px) {
  .lifecycle-steps { grid-template-columns: repeat(6, 1fr); }
}
.lifecycle-steps li {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}
.step-num {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}
.step-name { font-size: 0.95rem; font-weight: 600; }

/* Features */
.features { padding: 56px 0; background: var(--surface); }
.features h2 { font-size: 1.7rem; margin-bottom: 1.2em; }

.feature-grid {
  display: grid;
  gap: 24px;
}
@media (min-width: 720px) {
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
}

.feature {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.feature h3 { font-size: 1.1rem; margin-top: 0.8em; }
.feature p { color: var(--muted); margin-bottom: 0; }

.icon {
  width: 36px;
  height: 36px;
  fill: none;
  stroke: var(--accent-dark);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  background: var(--accent-soft);
  border-radius: 9px;
  padding: 6px;
}

/* Two-column feature grid (Features page) */
@media (min-width: 720px) {
  .feature-grid-2 { grid-template-columns: repeat(2, 1fr); }
}

/* Inner page header */
.page-head { padding: 48px 0 8px; }
.page-head h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); letter-spacing: -0.02em; }
.page-head .lead { font-size: 1.15rem; color: var(--muted); max-width: 46em; }

.cta-row { margin-top: 2em; display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px; }

/* Visually hidden but available to screen readers */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  overflow: hidden; white-space: nowrap;
}

/* Outline button variant */
.btn-outline {
  background: transparent;
  color: var(--accent-dark);
  border: 1px solid var(--accent);
}
.btn-outline:hover { background: var(--accent-soft); }

/* Pricing */
.pricing { padding: 40px 0 64px; }
.plans { display: grid; gap: 24px; }
@media (min-width: 800px) { .plans { grid-template-columns: repeat(3, 1fr); } }

.plan {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
  background: var(--bg);
}
.plan-featured { border-color: var(--accent); border-width: 2px; }
.plan-badge {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
  padding: 3px 10px;
  margin: 0 0 0.6em;
}
.plan-name { font-size: 1.2rem; margin: 0 0 0.4em; }
.plan-price { display: flex; align-items: baseline; gap: 6px; margin: 0 0 0.6em; }
.plan-amount { font-size: 1.6rem; font-weight: 700; color: var(--text); }
.plan-unit { font-size: 0.9rem; color: var(--muted); }
.plan-for { color: var(--muted); margin-bottom: 1em; }
.plan-list { list-style: none; margin: 0 0 1.6em; padding: 0; }
.plan-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  color: var(--text);
}
.plan-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 12px; height: 7px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}
.plan .btn { margin-top: auto; text-align: center; }
.pricing-note { color: var(--muted); margin-top: 2em; max-width: 52em; }

/* Contact */
.contact { padding: 40px 0 64px; }
.contact-grid { display: grid; gap: 24px; }
@media (min-width: 760px) { .contact-grid { grid-template-columns: repeat(3, 1fr); } }
.contact-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.contact-card h3 { font-size: 1.1rem; margin: 0 0 0.4em; }
.contact-card p { color: var(--muted); }
.contact-card .btn { margin-top: auto; text-align: center; }

/* Optional contact form (commented out in the markup until you wire an endpoint) */
.contact-form { display: grid; gap: 14px; max-width: 34em; margin-top: 32px; }
.contact-form label { display: grid; gap: 6px; font-weight: 600; }
.contact-form input,
.contact-form textarea {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
.contact-form button { justify-self: start; border: 0; cursor: pointer; }

/* FAQ — native <details>, no JS */
.faq { padding: 40px 0 64px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px 18px;
  margin-bottom: 12px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--accent-dark);
  line-height: 1;
}
.faq-item[open] summary::after { content: "\2212"; }  /* minus */
.faq-body { padding: 0 0 16px; }
.faq-body p { color: var(--muted); margin: 0; max-width: 60em; }
.faq-body a { color: var(--link); }

/* About / trust */
.about { padding: 56px 0; }
.about h2 { font-size: 1.7rem; }
.about p { max-width: 52em; color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); }

.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 22px;
  padding-bottom: 22px;
  color: var(--muted);
  font-size: 0.95rem;
}
.footer-row p { margin: 0; }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}