/* Geonergy shared design system.
   Extracted from index.html so calculator.html, store.html and admin.html
   inherit the same tokens, nav, buttons and footer. Keep in sync by hand:
   index.html still carries its own copy inline. */

  :root {
    --navy: #0B1D3A;
    --navy-2: #15305A;
    --navy-3: #1E3E6E;
    --white: #FFFFFF;
    --off-white: #F5F6F8;
    --accent-on-navy: #7FA6E6;
    --accent-on-white: #2C5590;
    --text-on-navy: #EDF1F6;
    --muted-on-navy: #93A3BE;
    --text-on-white: #0B1D3A;
    --muted-on-white: #5B6B84;
    --border-on-navy: rgba(237,241,246,0.16);
    --border-on-white: rgba(11,29,58,0.13);

    --font-display: 'Playfair Display', serif;
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2rem;
    --space-5: 3rem;
    --space-6: 4.5rem;
    --space-7: 6rem;
    --space-8: 7.5rem;

    --radius-sm: 4px;
    --radius-md: 10px;
    --container-w: 1180px;
  }

  * , *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-body);
    background: var(--white);
    color: var(--text-on-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; text-decoration: none; }
  button { font: inherit; cursor: pointer; background: none; border: none; }
  ul { list-style: none; }
  section[id] { scroll-margin-top: 84px; }

  a:focus-visible, button:focus-visible { outline: 2px solid var(--accent-on-white); outline-offset: 3px; }

  .container { max-width: var(--container-w); margin: 0 auto; padding: 0 var(--space-4); }
  section { padding: var(--space-8) 0; }
  @media (max-width: 720px) {
    section { padding: var(--space-6) 0; }
    .container { padding: 0 var(--space-3); }
  }

  h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; }
  h1 { font-size: clamp(2.15rem, 5vw, 3.75rem); }
  h2 { font-size: clamp(1.65rem, 3.4vw, 2.35rem); }
  h3 { font-size: 1.15rem; }
  p { font-size: 1.0625rem; }

  .eyebrow {
    font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.14em;
    text-transform: uppercase; font-weight: 500; color: var(--accent-on-white);
    display: block; margin-bottom: var(--space-2);
  }
  .section-dark .eyebrow, .hero .eyebrow { color: var(--accent-on-navy); }

  .section-header { max-width: 620px; margin-bottom: var(--space-5); }
  .section-body { color: var(--muted-on-white); font-size: 1.0625rem; max-width: 62ch; }
  .section-body + .section-body { margin-top: var(--space-2); }
  .section-dark .section-body { color: var(--muted-on-navy); }

  .section-light { background: var(--white); color: var(--text-on-white); }
  .section-dark { background: var(--navy); color: var(--text-on-navy); }

  /* Buttons — invert per background */
  .btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.85rem 1.5rem; border-radius: var(--radius-sm);
    font-weight: 600; font-size: 0.9375rem; border: 1px solid transparent;
    transition: all 0.2s ease;
  }
  .btn-primary { background: var(--navy); color: var(--white); }
  .btn-primary:hover { background: var(--navy-3); }
  .section-dark .btn-primary, .hero .btn-primary { background: var(--white); color: var(--navy); }
  .section-dark .btn-primary:hover, .hero .btn-primary:hover { background: var(--off-white); }

  .btn-secondary { border-color: var(--border-on-white); color: var(--text-on-white); }
  .btn-secondary:hover { border-color: var(--muted-on-white); }
  .section-dark .btn-secondary, .hero .btn-secondary { border-color: var(--border-on-navy); color: var(--text-on-navy); }
  .section-dark .btn-secondary:hover, .hero .btn-secondary:hover { border-color: var(--muted-on-navy); }

  /* Nav */
  .nav {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255,255,255,0.92); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-on-white);
  }
  .nav .container { display: flex; align-items: center; justify-content: space-between; padding: var(--space-2) var(--space-4); position: relative; }
  .nav-logo-img { height: 30px; width: auto; display: block; }
  .nav-links { display: flex; gap: var(--space-4); align-items: center; }
  .nav-links a { font-size: 0.9rem; color: var(--muted-on-white); transition: color 0.2s; }
  .nav-links a:hover { color: var(--text-on-white); }
  .nav-right { display: flex; align-items: center; gap: var(--space-3); }


  .nav-cta { background: var(--navy); color: var(--white); font-weight: 600; font-size: 0.85rem; padding: 0.6rem 1.15rem; border-radius: var(--radius-sm); }
  .nav-cta:hover { background: var(--navy-3); }
  .nav-toggle { display: none; color: var(--text-on-white); font-size: 1.4rem; padding: 0.2rem; }

  @media (max-width: 780px) {
    .nav-links {
      position: absolute; top: 100%; left: 0; right: 0;
      background: var(--white); flex-direction: column; align-items: flex-start;
      padding: var(--space-3) var(--space-4); gap: var(--space-3);
      border-bottom: 1px solid var(--border-on-white);
      display: none;
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: block; }
  }

  /* Phone header. The wordmark, the CTA and the menu toggle share one line,
     and with the desktop gutter that is more than fits on a small screen, so
     the gutter, the gap and finally the CTA's own padding give way rather
     than "Get in Touch" wrapping onto a second line.
     These sit after the nav rules above deliberately - a media query does not
     outrank a later rule of the same specificity. */
  @media (max-width: 480px) {
    .nav .container { padding-left: var(--space-3); padding-right: var(--space-3); }
    .nav-right { gap: 0.55rem; }
  }
  @media (max-width: 359px) {
    .nav .container { padding-left: var(--space-2); padding-right: var(--space-2); }
    .nav-right { gap: 0.4rem; }
    .nav-cta { padding: 0.55rem 0.7rem; font-size: 0.78rem; }
  }

  /* Footer */
  .footer { background: var(--navy); border-top: 1px solid var(--border-on-navy); padding: var(--space-5) 0; }
  .footer .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-2); }
  .footer-logo-img { height: 26px; width: auto; display: block; }
  .footer-tagline { font-size: 0.8125rem; color: var(--muted-on-navy); margin-top: 0.2rem; }

  /* Email and Instagram links — footer and contact */
  .footer-links { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
  .footer-social {
    display: inline-flex; align-items: center; gap: 0.45rem;
    font-size: 0.82rem; color: var(--muted-on-navy);
    transition: color 0.15s ease;
  }
  .footer-social:hover { color: var(--text-on-navy); }
  .footer-social svg { width: 17px; height: 17px; flex: none; }
  .footer-copy { font-size: 0.75rem; color: var(--muted-on-navy); opacity: 0.8; }

  /* Reveal on scroll */
  .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
  .reveal.visible { opacity: 1; transform: translateY(0); }

  @media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    .live-dot { animation: none; }
    html { scroll-behavior: auto; }
  }

  /* Inverter reference — used by inverter.html */
  .ec-tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: var(--space-4); }
  .ec-tab {
    font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em;
    padding: 0.55rem 1.2rem; border-radius: 999px; border: 1px solid var(--border-on-navy);
    color: var(--muted-on-navy); background: transparent; cursor: pointer; transition: all 0.15s ease;
  }
  .ec-tab:hover { color: var(--text-on-navy); border-color: var(--muted-on-navy); }
  .ec-tab.active { background: var(--accent-on-navy); border-color: var(--accent-on-navy); color: var(--navy); font-weight: 600; }

  .ec-model-tabs { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: var(--space-3); }
  .ec-model-tab {
    font-family: var(--font-body); font-size: 0.8rem; font-weight: 500;
    padding: 0.45rem 0.9rem; border-radius: var(--radius-sm); border: 1px solid var(--border-on-navy);
    color: var(--muted-on-navy); background: var(--navy-2); cursor: pointer; transition: all 0.15s ease;
  }
  .ec-model-tab:hover { color: var(--text-on-navy); }
  .ec-model-tab.active { border-color: var(--accent-on-navy); color: var(--text-on-navy); font-weight: 600; }
  .ec-model-category { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted-on-navy); margin-bottom: var(--space-3); }

  /* Fault codes / Warning codes / Programs: each opens and closes. */
  .ec-acc-list { display: flex; flex-direction: column; gap: 0.6rem; margin-bottom: var(--space-4); }
  .ec-acc { border: 1px solid var(--border-on-navy); border-radius: var(--radius-sm); overflow: hidden; background: var(--navy-2); }
  .ec-acc.open { border-color: var(--accent-on-navy); }
  .ec-acc-head {
    width: 100%; display: flex; align-items: center; gap: 0.7rem; text-align: left;
    padding: 0.85rem var(--space-3); background: transparent; color: var(--text-on-navy);
    border: none; cursor: pointer; font-family: var(--font-body); font-size: 1rem; font-weight: 600;
  }
  .ec-acc-name { flex: 1; min-width: 0; }
  .ec-acc-count { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 400; color: var(--muted-on-navy); }
  .ec-acc-icon { font-family: var(--font-mono); font-size: 1.1rem; color: var(--accent-on-navy); width: 1.2rem; text-align: center; }
  .ec-acc-body { padding: var(--space-3); border-top: 1px solid var(--border-on-navy); background: var(--navy); }
  .ec-acc-body[hidden] { display: none; }
  .ec-acc-body .ec-subsection { margin-bottom: 0; }

  .ec-subsection { margin-bottom: var(--space-4); }
  .ec-subsection-title { font-family: var(--font-display); font-weight: 600; color: var(--text-on-navy); font-size: 1.05rem; margin-bottom: var(--space-2); }
  .ec-source { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted-on-navy); margin-bottom: var(--space-2); }
  .ec-warning {
    font-size: 0.9rem; color: var(--text-on-navy); background: var(--navy-2);
    border: 1px solid var(--border-on-navy); border-left: 3px solid var(--accent-on-navy);
    border-radius: var(--radius-sm); padding: var(--space-2) var(--space-3); margin-bottom: var(--space-3);
  }
  .ec-search {
    width: 100%; font-family: var(--font-body); font-size: 0.9375rem;
    padding: 0.7rem 1rem; margin-bottom: var(--space-4);
    background: var(--navy-2); border: 1px solid var(--border-on-navy); border-radius: var(--radius-sm);
    color: var(--text-on-navy);
  }
  .ec-search::placeholder { color: var(--muted-on-navy); }
  .ec-list { display: flex; flex-direction: column; gap: 0.6rem; }
  .ec-item { background: var(--navy-2); border: 1px solid var(--border-on-navy); border-radius: var(--radius-sm); padding: var(--space-3); }
  .ec-item-head { display: flex; align-items: baseline; gap: 0.6rem; margin-bottom: 0.3rem; }
  .ec-code { font-family: var(--font-mono); font-weight: 600; color: var(--accent-on-navy); font-size: 0.9rem; }
  .ec-meaning { font-weight: 500; color: var(--text-on-navy); font-size: 0.9375rem; }
  .ec-action { color: var(--muted-on-navy); font-size: 0.875rem; }
  .ec-empty { color: var(--muted-on-navy); font-size: 0.9375rem; padding: var(--space-3) 0; }  .ec-empty p { margin-bottom: var(--space-2); max-width: 58ch; }
  .ec-empty p:last-of-type { margin-bottom: var(--space-3); }
  .ec-wa {
    display: inline-flex; align-items: center; gap: 0.45rem;
    padding: 0.62rem 1.05rem; border-radius: 999px;
    background: #3DD68C; color: #06301C; font-weight: 600; font-size: 0.875rem;
    transition: background 0.18s ease, transform 0.18s ease;
  }
  .ec-wa:hover { background: #35c07d; transform: translateY(-1px); }
  .ec-wa:focus-visible { outline: 2px solid #3DD68C; outline-offset: 3px; }
  @media (prefers-reduced-motion: reduce) { .ec-wa { transition: none; } .ec-wa:hover { transform: none; } }