/* ==========================================================================
   ASU Haus und Energie GmbH — Stylesheet
   ========================================================================== */

:root {
  --forest: #17352C;
  --forest-dark: #0F2620;
  --sage: #EDF1ED;
  --stone: #F5F3EF;
  --paper: #FFFFFF;
  --amber: #C9812E;
  --amber-dark: #A9691F;
  --ink: #16211C;
  --ink-soft: #4C594F;
  --line: #DCE3DD;

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --max-width: 1160px;
  --radius: 6px;
  --transition: 220ms ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--forest); line-height: 1.15; margin: 0 0 0.5em; font-weight: 500; }
p { margin: 0 0 1em; color: var(--ink-soft); }
button { font-family: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--forest);
  color: #fff;
  padding: 0.75em 1.25em;
  z-index: 200;
}
.skip-link:focus { left: 1rem; top: 1rem; }

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

.eyebrow {
  color: var(--amber-dark);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  margin: 0 0 0.75em;
}

.section-head { max-width: 620px; margin: 0 0 48px; }
.section-lead { max-width: 560px; font-size: 1.05rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85em 1.6em;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--amber); color: #fff; }
.btn-primary:hover { background: var(--amber-dark); }
.btn-ghost { background: transparent; color: var(--forest); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--forest); background: var(--sage); }
.btn-small { padding: 0.6em 1.2em; font-size: 0.85rem; }
.btn-full { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.is-scrolled {
  border-color: var(--line);
  box-shadow: 0 2px 16px rgba(23, 53, 44, 0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { color: var(--forest); display: inline-flex; }
.brand-text {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--forest);
}
.brand-text em { font-style: normal; color: var(--amber-dark); }
.brand-text.light { color: #fff; }
.brand-text.light em { color: var(--amber); }

.main-nav ul { display: flex; gap: 32px; }
.main-nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  position: relative;
  padding: 4px 0;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.main-nav a:hover::after,
.main-nav a.is-active::after { transform: scaleX(1); }

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--forest);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { background: var(--sage); padding: 72px 0 56px; overflow: hidden; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  margin-bottom: 0.4em;
}
.hero-lead { font-size: 1.08rem; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin: 28px 0 40px; }

.hero-stats {
  display: flex;
  gap: 36px;
  margin: 0;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.hero-stat dt {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 4px;
}
.hero-stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--forest);
  font-weight: 500;
}

.hero-visual { display: flex; justify-content: center; }
.hero-illustration { width: 100%; max-width: 380px; }
.illus-ring { fill: var(--paper); stroke: var(--line); stroke-width: 2; }
.illus-sun circle { transform-origin: 330px 90px; }

/* ---------- Trust strip ---------- */
.trust-strip { background: var(--forest); padding: 18px 0; }
.trust-strip-inner p {
  margin: 0;
  text-align: center;
  color: #DCE7E2;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

/* ---------- About ---------- */
.about { padding: 96px 0; }
.about-inner {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: center;
}
.about-illustration { border-radius: 14px; }
.about-copy h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.about-facts li { display: flex; flex-direction: column; gap: 4px; }
.fact-number { font-family: var(--font-display); font-size: 1.3rem; color: var(--forest); font-weight: 500; }
.fact-label { font-size: 0.85rem; color: var(--ink-soft); }

/* ---------- Services ---------- */
.services { padding: 96px 0; background: var(--stone); }
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  border-left: 3px solid var(--forest);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(23, 53, 44, 0.08);
  border-left-color: var(--amber);
}
.service-icon {
  display: inline-flex;
  width: 44px;
  height: 44px;
  color: var(--forest);
  margin-bottom: 18px;
}
.service-card h3 { font-size: 1.15rem; margin-bottom: 0.4em; }
.service-card p { margin: 0; font-size: 0.95rem; }

/* ---------- Benefits ---------- */
.benefits { padding: 96px 0; }
.benefits-inner {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}
.benefits-copy h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }

.benefits-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 32px;
}
.benefits-list h3 {
  font-size: 1.02rem;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.35em;
  padding-left: 18px;
  position: relative;
}
.benefits-list h3::before {
  content: "";
  position: absolute;
  left: 0; top: 6px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--amber);
}
.benefits-list p { font-size: 0.92rem; margin: 0; padding-left: 18px; }

/* ---------- Contact ---------- */
.contact { padding: 96px 0; background: var(--forest); color: #fff; }
.contact-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
}
.contact .eyebrow { color: var(--amber); }
.contact-info h2 { color: #fff; font-size: clamp(1.7rem, 3vw, 2.2rem); }
.contact-info .section-lead { color: #CBD9D2; }

.contact-details {
  margin-top: 32px;
  display: grid;
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.contact-details dt {
  font-size: 0.78rem;
  color: #9FB6AC;
  margin-bottom: 2px;
}
.contact-details dd { margin: 0; font-weight: 500; }
.contact-details a { color: #fff; border-bottom: 1px solid rgba(255,255,255,0.35); }
.contact-details a:hover { border-color: #fff; }

.contact-form {
  background: var(--paper);
  border-radius: 10px;
  padding: 36px;
  color: var(--ink);
}
.contact-form h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: 20px;
}
.form-row { margin-bottom: 18px; display: flex; flex-direction: column; }
.form-row label { font-size: 0.88rem; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
.form-row .optional { font-weight: 400; color: var(--ink-soft); }
.form-row input,
.form-row select,
.form-row textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.7em 0.85em;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  transition: border-color var(--transition);
  resize: vertical;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: var(--forest);
  outline: none;
}
.form-row.has-error input,
.form-row.has-error select,
.form-row.has-error textarea {
  border-color: #B3452F;
}
.form-error {
  min-height: 1.1em;
  font-size: 0.8rem;
  color: #B3452F;
  margin-top: 4px;
}
.form-status {
  min-height: 1.2em;
  margin: 14px 0 0;
  font-size: 0.9rem;
  font-weight: 500;
}
.form-status.success { color: #1F7A46; }
.form-status.error { color: #B3452F; }

/* ---------- Footer ---------- */
.site-footer { background: var(--forest-dark); color: #CBD9D2; padding: 64px 0 24px; }
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand p { color: #93A69C; margin-top: 10px; max-width: 260px; font-size: 0.9rem; }
.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-nav h4 { color: #fff; font-family: var(--font-body); font-size: 0.85rem; margin-bottom: 14px; }
.footer-nav ul { display: grid; gap: 10px; }
.footer-nav a { font-size: 0.9rem; color: #A9BBB2; transition: color var(--transition); }
.footer-nav a:hover { color: #fff; }

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.82rem;
  color: #7E9288;
}
.footer-bottom p { margin: 0; color: inherit; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-inner,
  .about-inner,
  .benefits-inner,
  .contact-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 300px; margin: 0 auto; }
  .about-media { max-width: 320px; margin: 0 auto; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 760px) {
  .main-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }
  .main-nav.is-open { max-height: 320px; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 8px 24px 16px; }
  .main-nav a { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-toggle { display: flex; }
  .header-actions .btn-small { display: none; }

  .service-grid { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; gap: 14px; }
  .benefits-list { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; }
  .contact-form { padding: 24px; }
  .hero-stats { gap: 24px; }
}