/* ============================================
   Sawa Engineering — Ingenieurbüro
   Bahn- & Brückenbau · technische Projektintelligenz
   Statisch, technisch, hochwertig — keine Animationen.
   ============================================ */

:root {
  --bg-primary: #0a0f1a;        /* Anthrazit / Navy */
  --bg-section: #0c1322;        /* alternierende Sektion */
  --bg-card: #0f1629;
  --bg-card-hover: #131c33;
  --text-primary: #e8edf5;
  --text-secondary: #9aa7bd;
  --accent: #00d4ff;            /* Cyan */
  --accent-2: #6aa9d0;          /* helles Stahlblau */
  --accent-dim: rgba(0, 212, 255, 0.22);
  --accent-glow: rgba(0, 212, 255, 0.07);
  --border: rgba(120, 160, 200, 0.16);   /* feiner Stahl-Hairline */
  --border-strong: rgba(0, 212, 255, 0.45);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1140px;
  --radius: 12px;
  --transition: 0.18s ease;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 80px;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.7;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Blueprint-Raster im Hintergrund (dezent, statisch) */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

/* ---- Layout ---- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

section {
  padding: 5rem 0;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-2);
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--accent-dim);
  padding: 0.25rem 0.7rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

/* ---- Navigation ---- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(10, 15, 26, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav-logo:hover {
  color: var(--text-primary);
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--accent);
}

/* ---- Hero ---- */

.hero {
  padding: 9rem 0 5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.4rem;
}

.hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 0.7rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 3.9rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 0.9rem;
}

.hero h1 .highlight {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subhead {
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.hero-body {
  font-size: 1.02rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  border-radius: 8px;
  font-size: 0.98rem;
  border: 1px solid var(--accent);
  transition: background-color var(--transition), border-color var(--transition);
}

.btn-primary:hover {
  background: #4fe0ff;
  border-color: #4fe0ff;
  color: var(--bg-primary);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  background: transparent;
  color: var(--accent);
  font-weight: 600;
  border-radius: 8px;
  font-size: 0.98rem;
  border: 1px solid var(--border-strong);
  transition: background-color var(--transition), color var(--transition);
}

.btn-secondary:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

/* Hero-Prozessgrafik (statisch, feine Linien) */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-process {
  width: 100%;
  max-width: 240px;
  height: auto;
}

.hero-process rect {
  fill: rgba(15, 22, 41, 0.65);
  stroke: var(--accent-dim);
  stroke-width: 1;
}

.hero-process line,
.hero-process path {
  stroke: var(--accent);
  stroke-width: 1.4;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-process text {
  fill: var(--text-primary);
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 500;
  text-anchor: middle;
}

/* ---- Section headings (shared) ---- */

section h2 {
  font-size: clamp(1.6rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}

.subtitle {
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 720px;
}

.focus-section,
.referenzen-section,
.zielgruppen-section,
.profil-section,
.kontakt-section {
  text-align: center;
}

.focus-section .section-tag,
.referenzen-section .section-tag,
.zielgruppen-section .section-tag,
.profil-section .section-tag,
.kontakt-section .section-tag,
.ki-section .section-tag {
  /* zentrierte Sektionen: Tag mittig */
}

.focus-section .subtitle,
.referenzen-section .subtitle,
.zielgruppen-section .subtitle,
.kontakt-section .subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* alternierende Sektions-Hintergründe */
.brueckenbau-section,
.referenzen-section,
.profil-section {
  background: var(--bg-section);
}

/* ---- Cards (Leistungen) ---- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  text-align: left;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), background-color var(--transition);
}

.card:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-glow);
  border: 1px solid var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent);
}

.card-icon svg {
  width: 26px;
  height: 26px;
}

.card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.card-list {
  list-style: none;
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card-list li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.card-list li::before {
  content: '\203A';   /* › */
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ---- Schwerpunkt-Sektionen (Eisenbahnbau / Brückenbau) ---- */

.eisenbahn-section {
  background:
    radial-gradient(ellipse at 80% 20%, rgba(0, 212, 255, 0.05), transparent 60%);
}

.eisenbahn-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.eisenbahn-text p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  margin-bottom: 1rem;
  max-width: 620px;
}

.eisenbahn-list {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.eisenbahn-list li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--text-primary);
  font-size: 0.92rem;
}

.eisenbahn-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
}

.eisenbahn-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.eisenbahn-visual svg {
  width: 100%;
  max-width: 250px;
  color: var(--accent);
  opacity: 0.85;
}

/* ---- KI-Projektintelligenz ---- */

.ki-section {
  text-align: center;
}

.ki-intro {
  max-width: 780px;
  margin: 0 auto 2.5rem;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* statischer Prozessfluss */
.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  gap: 0.75rem;
  margin: 0 auto 2.5rem;
  max-width: 900px;
}

.flow-step {
  flex: 1 1 200px;
  max-width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.flow-arrow {
  display: flex;
  align-items: center;
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 700;
}

.ki-list {
  list-style: none;
  max-width: 760px;
  margin: 0 auto;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.ki-list li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--text-secondary);
  font-size: 0.94rem;
}

.ki-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
}

/* ---- Referenzen ---- */

.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  text-align: left;
}

.ref-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: border-color var(--transition), background-color var(--transition);
}

.ref-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.ref-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.ref-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.ref-card h3 a {
  color: var(--text-primary);
  transition: color var(--transition);
}

.ref-card h3 a:hover {
  color: var(--accent);
}

.ref-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.ref-card p:last-child {
  margin-bottom: 0;
}

.ref-card strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ---- Zielgruppen ---- */

.zg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  text-align: left;
}

.zg-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
  padding: 1.5rem;
}

.zg-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.zg-item p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ---- Profil ---- */

.profil-box {
  max-width: 720px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  text-align: left;
}

.profil-box h3 {
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.profil-box .role {
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.profil-box p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.profil-list {
  list-style: none;
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.profil-list li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--text-primary);
  font-size: 0.92rem;
}

.profil-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
}

/* ---- Kontakt ---- */

.kontakt-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.kontakt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  text-align: left;
}

.kontakt-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
}

.kontakt-block h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.kontakt-block p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* ---- Footer ---- */

.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-weight: 500;
}

.footer-links a:hover {
  color: var(--accent);
}

/* ---- Legal Pages ---- */

.legal-page {
  padding: 8rem 0 4rem;
}

.legal-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 2rem;
}

.legal-page h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}

.legal-page p,
.legal-page li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.legal-page ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.legal-page a {
  color: var(--accent);
}

/* ---- Responsive ---- */

@media (max-width: 980px) {
  .nav-links {
    gap: 1.1rem;
  }

  .nav-links a {
    font-size: 0.8rem;
  }
}

@media (max-width: 880px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    order: 2;
  }

  .hero-process {
    max-width: 220px;
  }

  .eisenbahn-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  /* Visual jeweils oberhalb des Texts */
  .eisenbahn-visual {
    order: -1;
  }

  .eisenbahn-visual svg {
    max-width: 180px;
  }
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
  }

  section {
    padding: 3.5rem 0;
  }

  .hero {
    padding: 7rem 0 4rem;
  }

  .card-grid,
  .ki-list,
  .ref-grid,
  .zg-grid,
  .kontakt-grid {
    grid-template-columns: 1fr;
  }

  .flow {
    flex-direction: column;
    align-items: stretch;
  }

  .flow-step {
    max-width: none;
  }

  .flow-arrow {
    justify-content: center;
    transform: rotate(90deg);
  }

  .footer-links {
    flex-direction: column;
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1.1rem;
  }

  .hero-cta,
  .kontakt-cta {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .card,
  .profil-box {
    padding: 1.5rem;
  }
}