/* ==========================================================================
   Solar Bahnstrecke – Design System (BMV-inspired, Railway/Green palette)
   ========================================================================== */

/* --- 1. Custom Properties --- */
:root {
  --c-primary: #1a6b47;
  --c-primary-hover: #145a3b;
  --c-dark: #0e3d28;
  --c-light: #2a9d6e;
  --c-text: #1e1e1e;
  --c-text-secondary: #727272;
  --c-text-muted: #505050;
  --c-bg: #fff;
  --c-bg-light: #f0efed;
  --c-bg-neutral: #e0e0de;
  --c-border: #d9d9d9;
  --c-error: #b0002e;
  --font: "Source Sans 3", "Segoe UI", system-ui, -apple-system, sans-serif;
  --max-w: 78.75rem;
  --radius: 3px;
}

/* --- 2. Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-y: scroll;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--c-primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-primary-hover); }
a:focus-visible { outline: 2px dotted var(--c-primary); outline-offset: 3px; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; margin: 0; }
p { margin: 0; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; }
table { border-collapse: collapse; border-spacing: 0; width: 100%; }
figure { margin: 0; }
abbr[title] { border-bottom: 1px dotted rgba(0,0,0,.5); text-decoration: none; cursor: help; }

/* --- 3. Utility --- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.container {
  width: 100%; max-width: var(--max-w);
  margin-left: auto; margin-right: auto;
  padding-left: 4vw; padding-right: 4vw;
}
@media (min-width: 30em) { .container { padding-left: 2vw; padding-right: 2vw; } }
@media (min-width: 48em) { .container { padding-left: 1.5vw; padding-right: 1.5vw; } }
@media (min-width: 65em) { .container { padding-left: 1vw; padding-right: 1vw; } }
@media (min-width: 82em) { .container { padding-left: .9375rem; padding-right: .9375rem; } }

/* --- 4. Skip Link --- */
.skip-link {
  position: absolute; left: -200em; top: 0; padding: .5em 1em;
  background: var(--c-primary); color: #fff; z-index: 9999;
  font-weight: 700;
}
.skip-link:focus { left: 1em; top: 1em; }

/* --- 5. Header --- */
.header {
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 4rem;
}
.header-logo { display: flex; align-items: center; }
.header-logo img {
  height: 2.5rem; width: auto;
}
@media (min-width: 48em) {
  .header-inner { min-height: 5rem; }
  .header-logo img { height: 3rem; }
}

/* --- 6. Navigation --- */
.main-nav { display: none; }
.main-nav.active { display: block; }
.main-nav-list {
  display: flex; flex-direction: column; gap: 0;
  position: absolute; top: 100%; left: 0; right: 0;
  background: var(--c-dark); z-index: 99; padding: 1rem 4vw;
}
.main-nav-list a {
  display: block; color: #fff; padding: .6rem 0;
  font-weight: 600; font-size: 1rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.main-nav-list a:hover,
.main-nav-list a:focus { color: var(--c-light); }
.main-nav-list a.active { color: var(--c-light); }
.nav-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 2.5rem; height: 2.5rem; padding: 0;
}
.nav-toggle svg { width: 1.5rem; height: 1.5rem; fill: var(--c-text); }
.nav-toggle[aria-expanded="true"] svg { fill: var(--c-primary); }

@media (min-width: 48em) {
  .main-nav { display: block !important; }
  .main-nav-list {
    position: static; flex-direction: row; gap: 0;
    background: transparent; padding: 0;
  }
  .main-nav-list a {
    color: var(--c-text); padding: .4rem .9rem;
    border-bottom: 3px solid transparent; font-size: .9375rem;
  }
  .main-nav-list a:hover,
  .main-nav-list a:focus,
  .main-nav-list a.active {
    color: var(--c-primary-hover);
    border-bottom-color: var(--c-light);
  }
  .nav-toggle { display: none; }
}
@media (min-width: 65em) {
  .main-nav-list a { padding: .4rem 1.1rem; font-size: 1rem; }
}

/* --- 7. Breadcrumb --- */
.breadcrumb {
  background: var(--c-bg-light); padding: .8rem 0;
  font-size: .875rem; color: var(--c-text);
}
.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem; }
.breadcrumb-item { display: inline; }
.breadcrumb-item:not(:last-child)::after {
  content: "/"; color: #a7a7a7; margin-left: .35rem;
}
.breadcrumb-link { color: var(--c-primary); }
.breadcrumb-link:hover { text-decoration: underline; }

/* --- 8. Hero Section --- */
.hero {
  background: var(--c-primary); color: #fff;
  padding: 3rem 0 3.5rem; position: relative;
}
.hero-title {
  font-size: 2rem; font-weight: 700; line-height: 1.15;
  margin-bottom: .75rem; max-width: 50rem;
}
.hero-subtitle {
  font-size: 1.15rem; font-weight: 400; line-height: 1.4;
  max-width: 42rem; margin-bottom: 2rem; opacity: .92;
}
.hero .btn { background: #fff; color: var(--c-primary); border-color: #fff; }
.hero .btn:hover { background: var(--c-primary-hover); color: #fff; border-color: var(--c-primary-hover); }
@media (min-width: 48em) {
  .hero { padding: 4rem 0 4.5rem; }
  .hero-title { font-size: 3rem; }
  .hero-subtitle { font-size: 1.25rem; }
}
@media (min-width: 65em) {
  .hero-title { font-size: 3.5rem; }
}

/* --- 9. Statistics Bar --- */
.stats {
  background: var(--c-bg-light); padding: 2.5rem 0;
  border-bottom: 1px solid var(--c-border);
}
.stats-grid {
  display: grid; gap: 2rem;
  grid-template-columns: 1fr;
}
.stat-item { text-align: center; }
.stat-value {
  font-size: 2.25rem; font-weight: 700; color: var(--c-primary);
  line-height: 1.1; margin-bottom: .35rem;
}
.stat-label {
  font-size: .9375rem; color: var(--c-text-secondary); line-height: 1.3;
}
@media (min-width: 30em) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .stat-value { font-size: 2rem; }
}
@media (min-width: 48em) {
  .stat-value { font-size: 2.5rem; }
}

/* --- 10. Card Grid --- */
.card-section { padding: 3rem 0; }
.card-section-title {
  font-size: 1.125rem; color: var(--c-text-secondary);
  text-transform: uppercase; font-weight: 700;
  border-bottom: 1px solid var(--c-bg-neutral);
  padding-bottom: .8rem; margin-bottom: 2rem;
}
.card-grid {
  display: grid; gap: 2rem;
  grid-template-columns: 1fr;
}
.card {
  background: var(--c-bg); position: relative;
  transition: box-shadow .2s;
}
.card-topline {
  font-size: .8125rem; color: var(--c-text-secondary);
  margin-bottom: .35rem;
}
.card-topline .format {
  color: var(--c-primary); font-style: italic;
  text-transform: uppercase; font-weight: 700;
}
.card-title {
  font-size: 1.15rem; font-weight: 700; line-height: 1.25;
  margin-bottom: .5rem;
}
.card-title a { color: var(--c-text); }
.card-title a:hover { color: var(--c-primary-hover); text-decoration: underline; }
.card-text {
  font-size: .9375rem; color: var(--c-text-muted); line-height: 1.45;
  margin-bottom: .75rem;
}
.card-link {
  font-size: .8125rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .025em;
}
@media (min-width: 30em) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 65em) {
  .card-grid { grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
  .card-title { font-size: 1.25rem; }
}

/* --- 11. CTA Banner --- */
.cta-banner {
  background: var(--c-bg-light); padding: 2.5rem 0;
  border-top: 1px solid var(--c-border);
}
.cta-inner {
  display: flex; flex-direction: column; align-items: flex-start; gap: 1.25rem;
}
.cta-title { font-size: 1.5rem; font-weight: 700; color: var(--c-text); }
.cta-text { font-size: 1.0625rem; color: var(--c-text-muted); max-width: 38rem; }
@media (min-width: 48em) {
  .cta-inner { flex-direction: row; align-items: center; justify-content: space-between; }
}

/* --- 12. Buttons --- */
.btn {
  display: inline-block; border-radius: var(--radius);
  font-size: .8125rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .025em; padding: .7rem 1.5rem;
  border: 1px solid transparent; text-align: center;
  transition: all .2s; white-space: nowrap; cursor: pointer;
  text-decoration: none;
}
.btn-primary {
  background: var(--c-primary); color: #fff; border-color: var(--c-primary);
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--c-bg); color: var(--c-primary); border-color: var(--c-primary);
}
.btn-secondary {
  background: var(--c-bg-neutral); color: var(--c-text); border-color: var(--c-border);
}
.btn-secondary:hover, .btn-secondary:focus {
  background: var(--c-text-secondary); color: #fff; border-color: var(--c-text-secondary);
}
.btn-hero-cta {
  background: #fff; color: var(--c-primary); border-color: #fff;
  font-size: .875rem; padding: .8rem 2rem;
}
.btn-hero-cta:hover, .btn-hero-cta:focus {
  background: var(--c-primary-hover); color: #fff; border-color: var(--c-primary-hover);
}

/* --- 13. Article / Content Layout --- */
.article-layout {
  padding: 2.5rem 0 4rem;
}
.article-grid {
  display: grid; gap: 3rem;
  grid-template-columns: 1fr;
}
@media (min-width: 65em) {
  .article-grid { grid-template-columns: 2fr 1fr; gap: 4rem; }
}

/* Headline area */
.headline-area {
  background: var(--c-bg-light); padding: 2rem 0 2.5rem;
}
.headline-topline {
  font-size: .875rem; margin-bottom: .5rem;
}
.topline-format {
  color: var(--c-primary); text-transform: uppercase;
  font-weight: 700;
}
.topline-number {
  float: right; color: var(--c-text-secondary);
}
.headline-title {
  font-size: 2rem; font-weight: 700; line-height: 1.12;
  color: var(--c-text); margin-bottom: .5rem;
}
.headline-subtitle {
  font-size: 1.125rem; font-weight: 400; color: var(--c-text);
  line-height: 1.35; margin-top: .75rem;
}
.headline-meta {
  margin-top: 1rem; font-size: .875rem; color: var(--c-text-secondary);
}
@media (min-width: 48em) {
  .headline-title { font-size: 2.75rem; }
  .headline-subtitle { font-size: 1.25rem; }
}
@media (min-width: 65em) {
  .headline-title { font-size: 3.25rem; max-width: 83.333%; }
}

/* Rich text content */
.rich-text > * + * { margin-top: 1.25rem; }
.rich-text p {
  font-size: 1.125rem; line-height: 1.6; color: var(--c-text);
}
.rich-text h2 {
  font-size: 1.75rem; margin-top: 2.5rem; margin-bottom: .75rem;
  color: var(--c-text);
}
.rich-text h3 {
  font-size: 1.375rem; margin-top: 2rem; margin-bottom: .5rem;
  color: var(--c-text);
}
.rich-text h4 {
  font-size: 1.125rem; margin-top: 1.5rem; color: var(--c-text);
}
.rich-text ul, .rich-text ol {
  padding-left: 1.75rem; font-size: 1.125rem; line-height: 1.6;
}
.rich-text ul { list-style: disc; }
.rich-text ol { list-style: decimal; }
.rich-text li + li { margin-top: .4rem; }
.rich-text a { text-decoration: underline; }
.rich-text a:hover { color: var(--c-primary-hover); }
.rich-text strong { font-weight: 700; }

/* Blockquote */
.rich-text blockquote {
  border-left: 5px solid var(--c-light);
  padding: 1.25rem 1.5rem; margin: 2rem 0;
  background: transparent;
}
.rich-text blockquote p {
  font-style: italic; color: var(--c-text);
}
.rich-text blockquote cite {
  display: block; margin-top: .75rem;
  font-style: normal; font-size: .9375rem; color: var(--c-text-muted);
}

/* Summary Box */
.summary-box {
  background: var(--c-bg-light); border-left: 5px solid var(--c-primary);
  padding: 1.5rem 1.75rem; margin: 2rem 0;
}
.summary-box-title {
  font-size: 1.125rem; font-weight: 700; margin-bottom: .75rem;
  color: var(--c-text);
}
.summary-box ul {
  padding-left: 1.5rem; list-style: disc;
  font-size: 1rem; line-height: 1.6;
}
.summary-box li + li { margin-top: .35rem; }

/* Info box variant */
.info-box {
  background: var(--c-bg-light); padding: 1.5rem;
  border: 1px solid var(--c-border); margin: 2rem 0;
}
.info-box-title {
  font-size: 1rem; font-weight: 700; margin-bottom: .5rem;
  text-transform: uppercase; color: var(--c-text-secondary);
}

/* --- 14. Sidebar --- */
.sidebar-section { margin-bottom: 2.5rem; }
.sidebar-title {
  font-size: .875rem; font-weight: 700; text-transform: uppercase;
  color: var(--c-text-secondary); border-bottom: 1px solid var(--c-bg-neutral);
  padding-bottom: .6rem; margin-bottom: 1rem;
}
.sidebar-links li {
  padding: .6rem 0; border-bottom: 1px solid var(--c-bg-neutral);
}
.sidebar-links a {
  font-size: 1rem; font-weight: 600; color: var(--c-text);
}
.sidebar-links a:hover { color: var(--c-primary); text-decoration: underline; }
.sidebar-cta {
  background: var(--c-primary); color: #fff; padding: 1.5rem;
  border-radius: var(--radius);
}
.sidebar-cta-title {
  font-size: 1.125rem; font-weight: 700; margin-bottom: .5rem;
}
.sidebar-cta p { font-size: .9375rem; margin-bottom: 1rem; opacity: .9; }
.sidebar-cta .btn {
  background: #fff; color: var(--c-primary); border-color: #fff;
  width: 100%; text-align: center;
}
.sidebar-cta .btn:hover {
  background: var(--c-primary-hover); color: #fff; border-color: var(--c-primary-hover);
}

/* --- 15. Footer --- */
.footer {
  background: var(--c-dark); color: #fff;
  padding: 2.5rem 0; font-size: .9375rem; line-height: 1.6;
}
.footer a { color: #fff; }
.footer a:hover { text-decoration: underline; }
.footer a:focus-visible { outline-color: #fff; }
.footer-inner {
  display: flex; flex-direction: column; gap: 1.5rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
.footer-link {
  font-style: italic; font-size: .875rem;
}
.footer-link::before { content: "\00bb"; margin-right: .25rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.2);
  padding-top: 1rem; margin-top: 1rem;
  display: flex; flex-wrap: wrap; justify-content: space-between;
  align-items: center; gap: .75rem;
}
.footer-copyright { font-size: .875rem; }
.footer-top-link {
  font-size: .875rem; display: inline-flex; align-items: center; gap: .35rem;
}
.footer-top-link svg {
  width: 1rem; height: 1rem; fill: #fff;
  transform: rotate(-90deg);
}
@media (min-width: 48em) {
  .footer { padding: 3rem 0 2.5rem; }
}

/* --- 16. Legal Page --- */
.legal-content { max-width: 50rem; }
.legal-content h2 {
  font-size: 1.5rem; margin-top: 2.5rem; margin-bottom: .75rem;
}
.legal-content p {
  font-size: 1.0625rem; line-height: 1.6; margin-top: .75rem;
}
.legal-content p:first-child { margin-top: 0; }

/* --- 17. Print --- */
@media print {
  .header, .footer, .breadcrumb, .sidebar, .cta-banner, .nav-toggle { display: none !important; }
  body { font-size: 11pt; color: #000; }
  .container { max-width: 100%; padding: 0; }
  a { color: #000; text-decoration: underline; }
  .hero { background: #fff; color: #000; padding: 1rem 0; }
  .hero-title { color: #000; }
}