/* =============================================================================
   Praktisch KAD – style.css
   Dark Mode | Glassmorphism Nav | Asymmetrisches Bento Grid | Mobile-First
   ============================================================================= */

/* ── CSS Variables ── */
:root {
  /* Palette */
  --c-bg:            #0a0a0a;
  --c-surface:       #141414;
  --c-surface-2:     #1c1c1c;
  --c-surface-3:     #242424;
  --c-border:        rgba(255, 255, 255, 0.07);
  --c-accent:        #00e5ff;
  --c-accent-dim:    rgba(0, 229, 255, 0.10);
  --c-accent-glow:   rgba(0, 229, 255, 0.32);
  --c-accent-hover:  #33eaff;
  --c-text:          #e8e8e8;
  --c-text-muted:    #808080;
  --c-text-dim:      #444;
  --c-white:         #ffffff;
  --c-wa:            #25d366;
  --c-wa-dark:       #1aab53;
  --c-error:         #ff4d4d;

  /* Typography */
  --font-ui: system-ui, -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;

  /* Spacing */
  --sp-xs:   0.5rem;
  --sp-sm:   0.75rem;
  --sp-md:   1.5rem;
  --sp-lg:   3rem;
  --sp-xl:   5rem;
  --sp-2xl:  8rem;

  /* Layout */
  --max-w:         1100px;
  --header-h:      68px;
  --sticky-h:      64px;
  --radius:        8px;
  --radius-lg:     16px;
  --radius-xl:     24px;
  --transition:    0.2s ease;
  --transition-md: 0.35s ease;
  --shadow-sm:     0 2px 12px rgba(0, 0, 0, 0.4);
  --shadow-md:     0 8px 40px rgba(0, 0, 0, 0.6);

  /* Glassmorphism tokens */
  --glass-bg:     rgba(14, 14, 14, 0.65);
  --glass-border: rgba(0, 229, 255, 0.14);
  --glass-blur:   20px;
}

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

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  background-color: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Reserve space for mobile sticky bar */
  padding-bottom: var(--sticky-h);
}

img  { display: block; max-width: 100%; height: auto; }
a    { color: inherit; text-decoration: none; }
svg  { flex-shrink: 0; }

/* Scroll offset compensation for fixed header */
section[id] {
  scroll-margin-top: var(--header-h);
}

/* ── Accessibility ── */
.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;
}

[hidden] { display: none !important; }

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

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-md);
}

/* ── Reveal on Scroll ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity  0.65s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal[data-delay="1"] { transition-delay: 0.10s; }
.reveal[data-delay="2"] { transition-delay: 0.22s; }
.reveal[data-delay="3"] { transition-delay: 0.34s; }
.reveal[data-delay="4"] { transition-delay: 0.46s; }


/* =============================================================================
   HEADER – Glassmorphism
   ============================================================================= */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  z-index: 200;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header.scrolled {
  background: rgba(8, 8, 8, 0.88);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.6);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-md);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.logo-mark {
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.22em;
  color: var(--c-accent);
  background: var(--c-accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.28);
  padding: 0.28rem 0.55rem;
  border-radius: var(--radius);
  line-height: 1;
}

.logo-text {
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.015em;
}

/* Desktop Nav */
#main-nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text-muted);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-bg);
  background: var(--c-accent);
  padding: 0.45rem 1.15rem;
  border-radius: var(--radius);
  margin-left: 0.5rem;
  transition: filter var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 0 16px var(--c-accent-glow);
}

.nav-cta:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
  box-shadow: 0 0 28px var(--c-accent-glow);
}

/* Hamburger button */
#nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0.4rem 0.5rem;
  width: 42px;
  height: 38px;
  flex-shrink: 0;
}

#nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
  transform-origin: center;
}

#nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px)  rotate(45deg); }
#nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav overlay */
@media (max-width: 699px) {
  #nav-toggle { display: flex; }

  #main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 199;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(8, 8, 8, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--glass-border);
    padding-block: var(--sp-xs) var(--sp-sm);
    /* Hidden by default */
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.22s ease, opacity 0.22s ease;
  }

  #main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 0.9rem var(--sp-md);
    border-radius: 0;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    border-left: 2px solid transparent;
    transition: color var(--transition), background var(--transition), border-left-color var(--transition);
  }

  .nav-link:hover { border-left-color: var(--c-accent); }

  .nav-cta {
    margin: var(--sp-sm) var(--sp-md) 0;
    border-radius: var(--radius);
    text-align: center;
    justify-content: center;
    padding: 0.9rem;
  }
}


/* =============================================================================
   HERO – Video Background
   ============================================================================= */
#hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--c-bg);
  /* Dot-grid pattern – active when video is absent or loading */
  background-image: radial-gradient(rgba(0, 229, 255, 0.055) 1px, transparent 1px);
  background-size: 38px 38px;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0.5;
  /* Subtle desaturation to keep focus on text */
  filter: saturate(0.6) brightness(0.9);
}

/* Dark gradient overlay – readability guarantee */
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    135deg,
    rgba(10, 10, 10, 0.90) 0%,
    rgba(10, 10, 10, 0.60) 50%,
    rgba(0, 229, 255, 0.04) 100%
  );
}

/* Moving scan line – decorative */
.hero-scan-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--c-accent) 35%,
    var(--c-accent) 65%,
    transparent 100%
  );
  opacity: 0.3;
  z-index: 2;
  animation: scanDown 10s linear infinite;
}

@keyframes scanDown {
  0%   { top: -1px; }
  100% { top: 100%; }
}

/* Hero content */
.hero-inner {
  position: relative;
  z-index: 3;
  padding-top: calc(var(--header-h) + var(--sp-xl));
  padding-bottom: var(--sp-xl);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--sp-md);
  max-width: 860px;
}

.hero-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.22);
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
}

#hero-titel {
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--c-white);
}

#hero-subline {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: rgba(255, 255, 255, 0.62);
  max-width: 56ch;
  line-height: 1.75;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  margin-top: var(--sp-xs);
}

/* Scroll indicator */
.hero-scroll-hint {
  position: absolute;
  bottom: var(--sp-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}

.hero-scroll-hint span {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--c-accent), transparent);
  animation: scrollPulse 2.2s ease infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.25; transform: scaleY(0.9); }
  50%       { opacity: 0.8;  transform: scaleY(1.1); }
}


/* =============================================================================
   BUTTONS
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  border-radius: var(--radius);
  cursor: pointer;
  min-height: 52px;
  transition:
    transform     var(--transition),
    filter        var(--transition),
    box-shadow    var(--transition),
    background    var(--transition),
    border-color  var(--transition),
    color         var(--transition);
}

.btn:hover  { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--c-accent);
  color: var(--c-bg);
  box-shadow: 0 0 28px var(--c-accent-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 52px var(--c-accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn-ghost:hover {
  border-color: rgba(0, 229, 255, 0.4);
  color: var(--c-accent);
  background: var(--c-accent-dim);
}


/* =============================================================================
   SHARED SECTION STYLES
   ============================================================================= */
section {
  padding-block: var(--sp-xl);
}

#hero { padding-block: 0; }

.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-sm);
}

.section-title {
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--c-white);
  margin-bottom: var(--sp-lg);
}


/* =============================================================================
   ABOUT / STATEMENT
   ============================================================================= */
#about {
  background-color: var(--c-surface);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.statement {
  font-size: clamp(1.4rem, 3.5vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--c-white);
  line-height: 1.22;
  max-width: 22ch;
  margin-bottom: var(--sp-lg);
  border-left: 3px solid var(--c-accent);
  padding-left: var(--sp-md);
}

.about-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

@media (min-width: 600px) {
  .about-list { grid-template-columns: repeat(2, 1fr); }
}

.about-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  font-size: 0.9rem;
  color: var(--c-text-muted);
  padding: var(--sp-sm) var(--sp-md);
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  line-height: 1.6;
  transition: border-color var(--transition), color var(--transition);
}

.about-list li:hover {
  border-color: rgba(0, 229, 255, 0.2);
  color: var(--c-text);
}

.about-list li::before {
  content: '→';
  color: var(--c-accent);
  font-weight: 700;
  flex-shrink: 0;
  font-size: 0.95rem;
}


/* =============================================================================
   LEISTUNGEN – ASYMMETRISCHES BENTO GRID
   ============================================================================= */
#leistungen {
  background-color: var(--c-bg);
}

.bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

/* 3-column asymmetric layout on desktop:
   Item 1: col 1–2, row 1–2 (double-height feature card)
   Item 2: col 3, row 1
   Item 3: col 3, row 2
*/
@media (min-width: 700px) {
  .bento-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: minmax(272px, auto);
  }

  .bento-item:nth-child(1) {
    grid-column: 1 / 3;
    grid-row:    1 / 3;
  }

  .bento-item:nth-child(2) {
    grid-column: 3;
    grid-row:    1;
  }

  .bento-item:nth-child(3) {
    grid-column: 3;
    grid-row:    2;
  }
}

.bento-item {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  padding: var(--sp-lg);
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  overflow: hidden;
  transition:
    border-color var(--transition-md),
    transform    var(--transition-md),
    box-shadow   var(--transition-md);
}

/* Accent glow: invisible until hover */
.bento-item::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    ellipse at 18% 18%,
    rgba(0, 229, 255, 0.1) 0%,
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--transition-md);
  pointer-events: none;
}

/* Corner accent line */
.bento-item::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), transparent);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  opacity: 0;
  transition: opacity var(--transition-md);
}

.bento-item:hover {
  border-color: rgba(0, 229, 255, 0.25);
  transform: translateY(-4px);
  box-shadow:
    0 16px 56px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(0, 229, 255, 0.06);
}

.bento-item:hover::before { opacity: 1; }
.bento-item:hover::after  { opacity: 1; }

/* Tag */
.bento-tag {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.18);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  align-self: flex-start;
}

/* Icon */
.bento-icon {
  font-size: 2.2rem;
  line-height: 1;
  margin-top: auto;
}

/* Feature card (first item) gets scaled-up typography */
.bento-item:nth-child(1) .bento-icon {
  font-size: 3rem;
}

.bento-item h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-white);
  line-height: 1.18;
}

.bento-item:nth-child(1) h3 {
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
}

.bento-item p {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  line-height: 1.75;
  flex: 1;
}

.bento-item:nth-child(1) p {
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  max-width: 44ch;
}

/* Arrow CTA within card */
.bento-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.83rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-top: var(--sp-sm);
  transition: gap var(--transition), color var(--transition);
  letter-spacing: 0.01em;
}

.bento-item:hover .bento-arrow {
  gap: 0.75rem;
  color: var(--c-accent-hover);
}


/* =============================================================================
   KONTAKT
   ============================================================================= */
#kontakt {
  background-color: var(--c-surface);
  border-top: 1px solid var(--c-border);
}

.kontakt-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-md);
  max-width: 620px;
}

@media (min-width: 500px) {
  .kontakt-grid { grid-template-columns: repeat(2, 1fr); }
}

.kontakt-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: var(--sp-lg);
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  transition:
    border-color var(--transition),
    transform    var(--transition),
    box-shadow   var(--transition);
}

.kontakt-card:hover {
  border-color: rgba(0, 229, 255, 0.3);
  transform: translateY(-3px);
  box-shadow: 0 8px 36px rgba(0, 0, 0, 0.45);
}

.kontakt-icon {
  color: var(--c-accent);
  display: block;
  margin-bottom: var(--sp-xs);
}

.kontakt-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}

.kontakt-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.01em;
  transition: color var(--transition);
}

.kontakt-card:hover .kontakt-value { color: var(--c-accent); }

.kontakt-arrow {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-top: var(--sp-xs);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap var(--transition);
}

.kontakt-card:hover .kontakt-arrow { gap: 0.7rem; }


/* =============================================================================
   FOOTER
   ============================================================================= */
#site-footer {
  background-color: var(--c-bg);
  border-top: 1px solid var(--c-border);
  padding-block: var(--sp-md);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-sm);
  text-align: center;
}

@media (min-width: 600px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

#footer-copy {
  font-size: 0.8rem;
  color: var(--c-text-dim);
}

.footer-nav {
  display: flex;
  gap: var(--sp-md);
}

.footer-nav a {
  font-size: 0.8rem;
  color: var(--c-text-dim);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

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


/* =============================================================================
   STICKY ACTION BAR – Mobile only
   ============================================================================= */
#sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--sticky-h);
  display: grid;
  grid-template-columns: 1fr 1fr;
  z-index: 300;
  box-shadow: 0 -4px 28px rgba(0, 0, 0, 0.55);
}

.sticky-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #fff;
  transition: filter var(--transition);
}

.sticky-btn:hover  { filter: brightness(1.1); }
.sticky-btn:active { filter: brightness(0.88); }

.sticky-tel {
  background-color: var(--c-accent);
  color: var(--c-bg);
}

.sticky-wa {
  background-color: var(--c-wa);
}

/* Hide sticky bar on desktop – hero CTAs and nav CTA are sufficient */
@media (min-width: 700px) {
  #sticky-bar { display: none; }
  body        { padding-bottom: 0; }
}