/* =========================================
   Design Tokens
   ========================================= */
:root {
  --color-bg:           #0d1117;
  --color-surface:      #161b22;
  --color-surface-alt:  #1c2128;
  --color-border:       #30363d;
  --color-accent:       #00b4cc;
  --color-accent-dim:   #0090a8;
  --color-accent-glow:  rgba(0, 180, 204, 0.15);
  --color-text:         #e6edf3;
  --color-muted:        #8b949e;
  --color-white:        #ffffff;
  --color-heading:      #ffffff;
  --color-header-bg:    rgba(13, 17, 23, 0.92);

  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  8rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --transition-fast: 150ms ease;
  --transition-mid:  300ms ease;

  --nav-height: 80px;
}

/* =========================================
   Light Mode
   ========================================= */
[data-theme="light"] {
  --color-bg:           #f0f4f8;
  --color-surface:      #ffffff;
  --color-surface-alt:  #e8edf2;
  --color-border:       #d0d7de;
  --color-accent:       #0090a8;
  --color-accent-dim:   #007a8e;
  --color-accent-glow:  rgba(0, 144, 168, 0.12);
  --color-text:         #24292f;
  --color-muted:        #57606a;
  --color-heading:      #1f2328;
  --color-header-bg:    rgba(240, 244, 248, 0.92);
}

[data-theme="light"] h2,
[data-theme="light"] .leistung-card h3,
[data-theme="light"] .referenz-card__titel,
[data-theme="light"] .team-card__name,
[data-theme="light"] .impressum-content h3 {
  color: var(--color-heading);
}

[data-theme="light"] #site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

/* =========================================
   Reset & Base
   ========================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

ul { list-style: none; }

address { font-style: normal; }

/* =========================================
   Navigation
   ========================================= */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-mid);
}

#site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--color-header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

#site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: min(1200px, 100% - 2 * var(--space-md));
  margin-inline: auto;
}

.nav-logo {
  background: var(--color-white);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo img {
  height: 48px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav-links a {
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--color-text);
}

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

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

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

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--color-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-accent);
}

.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }

[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* =========================================
   Hero
   ========================================= */
#hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background-image: url('installation-schaltschrank-02.jpg');
  background-size: cover;
  background-position: center 40%;
  background-attachment: fixed;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(13, 17, 23, 0.92) 0%,
    rgba(13, 17, 23, 0.75) 50%,
    rgba(0, 80, 100, 0.25) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  padding: var(--space-lg) var(--space-md);
  width: min(860px, 100% - 2 * var(--space-md));
  margin-inline: auto;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background: var(--color-accent-dim);
  transform: translateY(-1px);
  text-decoration: none;
}

/* =========================================
   Section Layout
   ========================================= */
section {
  padding: var(--space-xl) 0;
}

section:nth-of-type(even) {
  background: var(--color-surface-alt);
}

.section-container {
  width: min(1200px, 100% - 2 * var(--space-md));
  margin-inline: auto;
}

.section-container--narrow {
  width: min(760px, 100% - 2 * var(--space-md));
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  color: var(--color-white);
}

h2::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  margin-top: 0.75rem;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 640px;
  margin-top: var(--space-sm);
}

.loading-text,
.error-text,
.empty-text {
  color: var(--color-muted);
  font-size: 0.95rem;
  padding: var(--space-md) 0;
}

/* =========================================
   Leistungen Grid
   ========================================= */
.leistungen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.leistung-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: border-color var(--transition-mid),
              box-shadow var(--transition-mid),
              transform var(--transition-mid);
}

.leistung-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent),
              0 8px 32px var(--color-accent-glow);
  transform: translateY(-2px);
}

.leistung-icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.leistung-icon svg {
  width: 100%;
  height: 100%;
}

.leistung-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.leistung-card p {
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.6;
}

/* =========================================
   Referenzen
   ========================================= */
.referenzen-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.filter-pill {
  cursor: pointer;
  padding: 6px 16px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: transparent;
  color: var(--color-muted);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  transition: border-color var(--transition-fast),
              color var(--transition-fast),
              background var(--transition-fast);
}

.filter-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.filter-pill.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
}

.referenzen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.referenz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-mid), transform var(--transition-mid);
}

.referenz-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.referenz-card__image {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  width: 100%;
}

.referenz-card__image--placeholder {
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-surface-alt) 0%, var(--color-border) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-border);
}

.referenz-card__image--placeholder svg {
  width: 48px;
  height: 48px;
}

.referenz-card__body {
  padding: var(--space-sm) var(--space-md);
}

.referenz-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-xs);
  flex-wrap: wrap;
}

.referenz-card__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 0.08em;
}

.referenz-card__kategorie {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 2px 8px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
}

.referenz-card__titel {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 0.25rem;
}

.referenz-card__auftraggeber {
  font-size: 0.82rem;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.referenz-card__beschreibung {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.6;
}

/* =========================================
   Team / Über uns
   ========================================= */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.team-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  transition: border-color var(--transition-mid);
}

.team-card:hover {
  border-color: var(--color-accent);
}

.team-card__foto {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-sm);
  border: 2px solid var(--color-accent);
}

.team-card__foto--placeholder {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-surface-alt);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-sm);
  color: var(--color-border);
}

.team-card__foto--placeholder svg {
  width: 48px;
  height: 48px;
}

.team-card__name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 0.25rem;
}

.team-card__rolle {
  font-size: 0.82rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  margin-bottom: var(--space-xs);
}

.team-card__beschreibung {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.team-card__kontakt {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: center;
}

.team-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.team-card__link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.team-card__link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* =========================================
   Kontakt
   ========================================= */
.kontakt-block {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.kontakt-item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.kontakt-icon {
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.kontakt-icon svg {
  width: 24px;
  height: 24px;
}

.kontakt-label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: 0.35rem;
}

.kontakt-link {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.kontakt-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.kontakt-address {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.8;
}

/* =========================================
   Impressum
   ========================================= */
.impressum-content {
  margin-top: var(--space-md);
}

.impressum-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.impressum-content h4 {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.impressum-content p,
.impressum-content address {
  font-size: 0.92rem;
  color: var(--color-muted);
  line-height: 1.8;
}

.impressum-content a {
  color: var(--color-accent);
}

/* =========================================
   Footer
   ========================================= */
footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.footer-inner {
  width: min(1200px, 100% - 2 * var(--space-md));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-logo {
  background: var(--color-white);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}

.footer-logo:hover {
  opacity: 1;
}

.footer-logo img {
  height: 42px;
  width: auto;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-muted);
}

footer nav a {
  font-size: 0.85rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* =========================================
   Mobile Navigation
   ========================================= */
@media (max-width: 768px) {
  :root { --nav-height: 60px; }

  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-md);
    font-size: 1.25rem;
    border-top: 1px solid var(--color-border);
    z-index: 99;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.1rem;
    padding: var(--space-xs) 0;
    color: var(--color-text);
  }

  #hero {
    background-attachment: scroll;
  }

  .leistungen-grid {
    grid-template-columns: 1fr;
  }

  .referenzen-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --space-xl: 4rem;
    --space-lg: 2.5rem;
  }
}

/* =========================================
   Reduced Motion
   ========================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}