/* ==========================================================================
   EBT Elektrobau GmbH Thüringen – Stylesheet
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Colour */
  --paper: #F1EFE9;
  --paper-deep: #E7E3DA;
  --ink: #272826;
  --muted: #64605A;
  --line: rgba(39, 40, 38, 0.2);
  --accent: #2E5A47;
  --accent-strong: #234638;
  --on-dark: #E9E6DE;
  --muted-on-dark: #AFABA1;
  --accent-on-dark: #9CC4AE;
  --error: #9B2C2C;

  /* Type */
  --font-display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Public Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;

  /* Spacing */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 7rem;

  --container: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --header-h: 84px;
  --header-h-compact: 62px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h-compact) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }

img, svg { display: block; max-width: 100%; }
figure { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
address { font-style: normal; }
h1, h2, h3, p, dl, dd, blockquote { margin: 0; }

a { color: inherit; }

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

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -4rem;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  z-index: 200;
  transition: top 0.2s;
}
.skip-link:focus { top: var(--space-1); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(4.5rem, 10vw, var(--space-6)); }

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 20ch;
  text-wrap: balance;
}

/* ---------- Buttons and links ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.7rem;
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font: 600 0.98rem/1 var(--font-body);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

.btn-small {
  padding: 0.6rem 1.1rem;
  font-size: 0.9rem;
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-small:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.btn-full { width: 100%; }

.text-link {
  position: relative;
  padding-block: 0.25rem;
  font-weight: 600;
  text-decoration: none;
}
.text-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--ink);
  transform-origin: left;
  transition: transform 0.3s var(--ease), background 0.3s;
}
.text-link:hover::after { transform: scaleX(0.35); background: var(--accent); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: height 0.3s var(--ease), background 0.3s, border-color 0.3s;
}
.site-header.is-scrolled,
.site-header.is-open {
  height: var(--header-h-compact);
  background: var(--paper);
  border-bottom-color: var(--line);
}

.header-inner {
  max-width: var(--container);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}
.logo-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.7rem;
  letter-spacing: -0.03em;
  line-height: 1;
}
.logo-text {
  padding-left: 0.75rem;
  border-left: 1px solid var(--ink);
  font-size: 0.75rem;
  line-height: 1.25;
  color: var(--muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.site-nav ul { display: flex; gap: var(--space-3); }
.site-nav li a {
  position: relative;
  display: inline-block;
  padding-block: 0.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
}
.site-nav li a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.site-nav li a:hover::after,
.site-nav li a.is-active::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0;
  background: none;
  border: 0;
  color: var(--ink);
  font: 600 0.95rem/1 var(--font-body);
  cursor: pointer;
}
.nav-toggle-bars {
  position: relative;
  width: 22px;
  height: 12px;
}
.nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}
.nav-toggle-bars span:first-child { top: 0; }
.nav-toggle-bars span:last-child { top: 10px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child { top: 5px; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(var(--header-h) + clamp(2rem, 6vw, 5rem));
  padding-bottom: clamp(4rem, 8vw, 7rem);
}
.hero-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
}

.hero-tag {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: var(--space-3);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--muted);
}
.tag-line { width: 2.5rem; height: 2px; background: var(--accent); }

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.9rem, 7.4vw, 6.6rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  max-width: 11ch;
}

.hero-lead {
  max-width: 46ch;
  margin-top: var(--space-4);
  font-size: clamp(1.05rem, 1.6vw, 1.22rem);
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
  margin-top: var(--space-4);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, auto);
  justify-content: start;
  gap: var(--space-4);
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
}
.hero-meta dt { font-size: 0.82rem; color: var(--muted); }
.hero-meta dd { font-weight: 600; }

.hero-visual { position: relative; padding-bottom: 3rem; }
.hero-figure { aspect-ratio: 5 / 6; overflow: hidden; }
.hero-figure svg { width: 100%; height: 100%; }

.hero-note {
  position: absolute;
  left: -2.5rem;
  bottom: 0;
  width: min(17rem, 70%);
  padding: var(--space-2) var(--space-3);
  background: var(--paper);
  border: 1px solid var(--ink);
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--muted);
}
.hero-note-title {
  margin-bottom: 0.25rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
}
.hero-block {
  position: absolute;
  right: -1.25rem;
  bottom: 1.5rem;
  width: 4.5rem;
  height: 4.5rem;
  background: var(--accent);
}

/* ---------- About ---------- */
.about { border-top: 1px solid var(--line); }

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2rem, 7vw, 7rem);
  margin-top: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}
.about-visual { margin-top: clamp(0rem, 4vw, 4rem); }
.about-visual figure { aspect-ratio: 4 / 4.8; overflow: hidden; }
.about-visual svg { width: 100%; height: 100%; }
.about-visual figcaption { margin-top: 0.6rem; font-size: 0.8rem; color: var(--muted); }

.about-columns { columns: 2 16rem; column-gap: var(--space-4); }
.about-columns p { margin-bottom: var(--space-2); break-inside: avoid; }

.about-statement {
  margin-top: var(--space-4);
  padding-left: var(--space-3);
  border-left: 4px solid var(--accent);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.4rem, 2.6vw, 2.05rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  max-width: 28ch;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
}
.facts dt { font-size: 0.82rem; color: var(--muted); }
.facts dd { font-weight: 600; }

/* ---------- Services ---------- */
.services { background: var(--paper-deep); }

.services-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3) var(--space-5);
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}
.services-intro { max-width: 36ch; color: var(--muted); }

.services-layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.service-featured {
  position: sticky;
  top: calc(var(--header-h-compact) + 24px);
  background: var(--paper);
  border: 1px solid var(--ink);
}
.service-featured figure { aspect-ratio: 3 / 2; overflow: hidden; border-bottom: 1px solid var(--ink); }
.service-featured svg { width: 100%; height: 100%; }
.service-featured-body { padding: var(--space-3) var(--space-3) var(--space-4); }
.service-featured h3 {
  margin-top: var(--space-2);
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.service-featured p { margin-top: var(--space-1); color: var(--muted); }

.service-icon { width: 2rem; height: 2rem; color: var(--accent); }
.service-icon svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.service-list { border-bottom: 1px solid var(--line); }
.service-row {
  display: grid;
  grid-template-columns: 2.5rem 2rem minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid var(--line);
  transition: background 0.3s var(--ease);
}
.service-num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--muted);
  padding-top: 0.2rem;
  transition: color 0.3s;
}
.service-row .service-icon { margin-top: 0.1rem; }
.service-body { transition: transform 0.35s var(--ease); }
.service-body h3 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
}
.service-body p { margin-top: 0.35rem; color: var(--muted); max-width: 52ch; }

.service-row:hover { background: rgba(255, 255, 255, 0.45); }
.service-row:hover .service-num { color: var(--accent); }
.service-row:hover .service-body { transform: translateX(6px); }

/* ---------- Approach (contrast section) ---------- */
.approach { background: var(--ink); color: var(--on-dark); }
.approach .section-title { color: var(--on-dark); }

.approach-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3) var(--space-5);
}
.approach-intro { max-width: 30ch; color: var(--muted-on-dark); }

.approach-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(2rem, 8vw, 7rem);
  margin-top: clamp(2.5rem, 6vw, 5rem);
}
.benefit {
  padding-block: var(--space-3) var(--space-5);
  border-top: 1px solid rgba(233, 230, 222, 0.25);
}
.benefit:nth-child(even) { transform: translateY(clamp(0rem, 5vw, 4.5rem)); }

.benefit-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4.5rem, 10vw, 8rem);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--accent-on-dark);
}
.benefit h3 {
  margin-top: var(--space-2);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  letter-spacing: -0.015em;
}
.benefit p { margin-top: var(--space-1); max-width: 40ch; color: var(--muted-on-dark); }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
}
.contact-lead { margin-top: var(--space-3); max-width: 40ch; color: var(--muted); }

.contact-details {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
}
.contact-details h3 { font-size: 0.82rem; font-weight: 500; color: var(--muted); }
.contact-mail {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  letter-spacing: -0.01em;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
  text-decoration-color: var(--accent);
  overflow-wrap: anywhere;
  transition: color 0.25s;
}
.contact-mail:hover { color: var(--accent); }

.contact-form-wrap {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--paper-deep);
  border-top: 4px solid var(--accent);
}

.field { margin-bottom: var(--space-3); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 var(--space-3); }

.field label { display: block; margin-bottom: 0.35rem; font-size: 0.9rem; font-weight: 600; }
.optional { font-weight: 400; color: var(--muted); }

.field input,
.field textarea {
  width: 100%;
  padding: 0.7rem 0.1rem;
  background: transparent;
  border: 0;
  border-bottom: 1.5px solid var(--ink);
  border-radius: 0;
  color: var(--ink);
  font: inherit;
  transition: border-color 0.25s, background 0.25s;
}
.field textarea { resize: vertical; min-height: 7rem; }
.field input:focus,
.field textarea:focus { outline: none; border-bottom-color: var(--accent); background: rgba(255, 255, 255, 0.5); }

.field.has-error input,
.field.has-error textarea { border-bottom-color: var(--error); }
.field-error { min-height: 1.3rem; margin-top: 0.25rem; font-size: 0.85rem; color: var(--error); }

.form-status { margin-top: var(--space-2); font-weight: 500; }
.form-status:empty { display: none; }
.form-status.is-success { padding: var(--space-2); background: rgba(46, 90, 71, 0.12); border-left: 4px solid var(--accent); }
.form-status.is-error { padding: var(--space-2); background: rgba(155, 44, 44, 0.1); border-left: 4px solid var(--error); color: var(--error); }

/* ---------- Footer ---------- */
.site-footer {
  padding-top: var(--space-5);
  background: var(--ink);
  color: var(--on-dark);
  font-size: 0.95rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  padding-bottom: var(--space-5);
}
.footer-name { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; letter-spacing: -0.01em; }
.footer-desc { margin-top: var(--space-1); max-width: 34ch; color: var(--muted-on-dark); }

.footer-col h2 { margin-bottom: var(--space-2); font-size: 0.85rem; font-weight: 500; color: var(--muted-on-dark); }
.footer-col li + li { margin-top: 0.4rem; }
.footer-col address { line-height: 1.7; }
.footer-col a { text-decoration: none; background: linear-gradient(currentColor, currentColor) left bottom / 0 1px no-repeat; transition: background-size 0.3s var(--ease), color 0.25s; }
.footer-col a:hover { background-size: 100% 1px; color: #fff; }
.footer-col address a { overflow-wrap: anywhere; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  padding-block: var(--space-3);
  border-top: 1px solid rgba(233, 230, 222, 0.2);
  font-size: 0.85rem;
  color: var(--muted-on-dark);
}
.footer-bottom a { text-decoration: none; }
.footer-bottom a:hover { color: #fff; }

/* ---------- Reveal on scroll (only active when JS is available) ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.js .reveal.is-visible { opacity: 1; transform: none; }
.js .benefit.reveal:nth-child(even) { transform: translateY(calc(clamp(0rem, 5vw, 4.5rem) + 16px)); }
.js .benefit.reveal:nth-child(even).is-visible { transform: translateY(clamp(0rem, 5vw, 4.5rem)); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .hero-note { left: -1rem; }
}

@media (max-width: 860px) {
  :root { --header-h: 68px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    inset: var(--header-h-compact) 0 0 0;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: var(--space-4);
    padding: var(--space-4) var(--gutter);
    background: var(--paper);
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0s linear 0.25s;
  }
  .site-header.is-open .site-nav {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition-delay: 0s;
  }
  .site-nav ul { flex-direction: column; gap: 0; width: 100%; }
  .site-nav li { border-bottom: 1px solid var(--line); }
  .site-nav li a {
    display: block;
    padding-block: 1rem;
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
  }
  .site-nav li a::after { display: none; }
  .site-nav .btn-small { padding: 0.9rem 1.4rem; font-size: 1rem; }

  .hero-inner,
  .about-grid,
  .services-layout,
  .contact-grid { grid-template-columns: 1fr; }

  .hero-visual { max-width: 30rem; margin-left: 1.5rem; }
  .hero-note { left: -1.5rem; }
  .about-visual { max-width: 26rem; margin-top: 0; }
  .service-featured { position: static; }
  .approach-grid { grid-template-columns: 1fr; }
  .benefit:nth-child(even),
  .js .benefit.reveal:nth-child(even),
  .js .benefit.reveal:nth-child(even).is-visible { transform: none; }
  .js .benefit.reveal:nth-child(even):not(.is-visible) { transform: translateY(16px); }
}

@media (max-width: 560px) {
  body { font-size: 1rem; }
  .logo-text { display: none; }
  .hero-meta { grid-template-columns: 1fr 1fr; gap: var(--space-3); }
  .facts { grid-template-columns: 1fr; }
  .service-row { grid-template-columns: 2rem minmax(0, 1fr); }
  .service-row .service-icon { display: none; }
  .field-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}