/* ==========================================================================
   DACHWERK KÖLN — Demo-Website
   Design-System & Styles
   Reines CSS3, keine externen Abhängigkeiten.
   ========================================================================== */

/* -----------------------------------------------------------------------
   1. DESIGN-TOKENS
   ----------------------------------------------------------------------- */
:root {
  /* Farbwelt: Schiefer / Anthrazit / Blau-Schwarz / Off-White */
  --slate-950: #0e1114;
  --slate-900: #14181c;
  --slate-850: #191d22;
  --slate-800: #1f242a;
  --slate-700: #2a3037;
  --slate-600: #3a424b;
  --slate-500: #556069;
  --anthracite: #23282e;
  --blueblack: #10151b;

  --off-white: #ece8e1;
  --paper: #f4f1ea;
  --muted: #a2aab2;
  --muted-strong: #c3c9cf;
  --line: rgba(236, 232, 225, 0.10);
  --line-strong: rgba(236, 232, 225, 0.18);

  /* Akzent: warmes Kupferorange / Terrakotta */
  --copper: #d9682f;
  --copper-bright: #ef7a3c;
  --copper-deep: #b4501f;
  --copper-glow: rgba(217, 104, 47, 0.22);

  /* Semantik */
  --bg: var(--slate-950);
  --bg-elevated: var(--slate-850);
  --bg-card: linear-gradient(160deg, var(--slate-800), var(--slate-900));
  --text: var(--off-white);
  --text-dim: var(--muted);
  --accent: var(--copper);

  /* Typografie */
  --font-sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Roboto,
    "Inter", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", Consolas, "Roboto Mono", monospace;

  --step--1: clamp(0.80rem, 0.76rem + 0.18vw, 0.9rem);
  --step-0: clamp(0.95rem, 0.90rem + 0.25vw, 1.06rem);
  --step-1: clamp(1.12rem, 1.03rem + 0.45vw, 1.4rem);
  --step-2: clamp(1.35rem, 1.15rem + 0.95vw, 1.9rem);
  --step-3: clamp(1.7rem, 1.35rem + 1.7vw, 2.6rem);
  --step-4: clamp(2.1rem, 1.5rem + 3vw, 3.6rem);
  --step-5: clamp(2.6rem, 1.6rem + 5vw, 5.2rem);

  /* Raum & Form */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --maxw: 1200px;
  --gutter: clamp(1.1rem, 4vw, 2.6rem);
  --section-py: clamp(3.5rem, 8vw, 7rem);

  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.25);
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 32px 80px rgba(0, 0, 0, 0.5);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur: 0.5s;

  --header-h: 74px;
}

/* -----------------------------------------------------------------------
   2. RESET & BASIS
   ----------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* Globaler Bauplan-/Schiefer-Hintergrund */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1200px 700px at 78% -8%, rgba(217, 104, 47, 0.10), transparent 60%),
    radial-gradient(1000px 800px at 0% 100%, rgba(40, 60, 80, 0.18), transparent 55%),
    linear-gradient(180deg, var(--slate-950), var(--blueblack));
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url("assets/roof-grid.svg");
  background-size: cover;
  color: rgba(120, 140, 160, 0.6);
  opacity: 0.05;
  pointer-events: none;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
select,
textarea {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.02em;
}

::selection {
  background: var(--copper);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--copper-bright);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -60px;
  transform: translateX(-50%);
  background: var(--copper);
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: 2000;
  transition: top 0.25s var(--ease);
  font-weight: 600;
}
.skip-link:focus {
  top: 0;
}

/* -----------------------------------------------------------------------
   3. LAYOUT-HILFEN
   ----------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-py);
  position: relative;
}

.section--tight {
  padding-block: clamp(2.5rem, 5vw, 4rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper-bright);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--copper);
  display: inline-block;
}

.section-head {
  max-width: 46rem;
  margin-bottom: clamp(2rem, 4vw, 3.2rem);
}
.section-head h2 {
  font-size: var(--step-4);
  margin-top: 0.8rem;
}
.section-head p {
  color: var(--text-dim);
  font-size: var(--step-1);
  margin-top: 1rem;
  max-width: 42rem;
}

.note-strip {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1.4rem;
  padding: 0.5rem 0.95rem;
  border: 1px dashed var(--line-strong);
  border-radius: 100px;
  font-size: var(--step--1);
  color: var(--muted-strong);
  background: rgba(217, 104, 47, 0.06);
}
.note-strip::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--copper);
  flex: none;
}

/* Geneigte Sektions-Trennkante */
.slope-divider {
  height: clamp(40px, 6vw, 90px);
  width: 100%;
  background: linear-gradient(to bottom right, transparent 49.5%, var(--slate-900) 50%);
}

/* -----------------------------------------------------------------------
   4. BUTTONS
   ----------------------------------------------------------------------- */
.btn {
  --btn-bg: var(--slate-700);
  --btn-fg: var(--off-white);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 1.6rem;
  border-radius: var(--radius);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: var(--step-0);
  letter-spacing: 0.01em;
  border: 1px solid var(--line-strong);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease), border-color 0.25s var(--ease);
  will-change: transform;
  overflow: hidden;
  text-align: center;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(0);
}

.btn--primary {
  --btn-bg: linear-gradient(135deg, var(--copper), var(--copper-deep));
  --btn-fg: #fff;
  border-color: transparent;
  box-shadow: 0 10px 30px var(--copper-glow);
}
.btn--primary:hover {
  box-shadow: 0 16px 40px var(--copper-glow);
}

.btn--ghost {
  --btn-bg: transparent;
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  background: rgba(236, 232, 225, 0.05);
  border-color: var(--copper);
}

.btn--block {
  width: 100%;
}

.btn .btn__arrow {
  transition: transform 0.3s var(--ease);
}
.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* -----------------------------------------------------------------------
   5. INTRO-LOADER
   ----------------------------------------------------------------------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: grid;
  place-items: center;
  background: var(--blueblack);
  transition: opacity 0.7s var(--ease), visibility 0.7s var(--ease);
}
.loader.is-done {
  opacity: 0;
  visibility: hidden;
}
.loader__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.4rem;
  width: min(300px, 74vw);
}
.loader__roof {
  width: 120px;
  height: 78px;
}
.loader__roof path,
.loader__roof line {
  stroke: var(--off-white);
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
  animation: draw 1.1s var(--ease) forwards;
}
.loader__roof .accent {
  stroke: var(--copper);
  animation-delay: 0.5s;
}
@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}
.loader__word {
  font-size: 0.78rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--muted);
  padding-left: 0.42em;
}
.loader__bar {
  width: 100%;
  height: 3px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
}
.loader__bar::after {
  content: "";
  display: block;
  height: 100%;
  width: 40%;
  background: linear-gradient(90deg, transparent, var(--copper), transparent);
  animation: loaderSlide 1s var(--ease-in-out) infinite;
}
@keyframes loaderSlide {
  from {
    transform: translateX(-120%);
  }
  to {
    transform: translateX(320%);
  }
}

/* -----------------------------------------------------------------------
   6. OBERE HINWEISLEISTE
   ----------------------------------------------------------------------- */
.topbar {
  background: var(--blueblack);
  border-bottom: 1px solid var(--line);
  font-size: var(--step--1);
  color: var(--muted);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 38px;
  padding-block: 0.35rem;
}
.topbar__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}
.topbar__status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 0 0 var(--copper-glow);
  animation: pulse 2.4s var(--ease-in-out) infinite;
  flex: none;
}
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(217, 104, 47, 0.5);
  }
  70% {
    box-shadow: 0 0 0 9px rgba(217, 104, 47, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(217, 104, 47, 0);
  }
}
.topbar__badge {
  padding: 0.1rem 0.6rem;
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  letter-spacing: 0.05em;
}
@media (max-width: 640px) {
  .topbar__item--hide-sm {
    display: none;
  }
}

/* -----------------------------------------------------------------------
   7. SCROLL-FORTSCHRITT
   ----------------------------------------------------------------------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--copper-deep), var(--copper-bright));
  z-index: 1600;
  will-change: transform;
}

/* -----------------------------------------------------------------------
   8. HEADER / NAVIGATION
   ----------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1500;
  background: rgba(16, 21, 27, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease);
}
.header.is-scrolled {
  background: rgba(14, 17, 20, 0.9);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  transition: min-height 0.35s var(--ease);
}
.header.is-scrolled .header__inner {
  min-height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--off-white);
  flex: none;
}
.brand__mark {
  width: 40px;
  height: 40px;
  color: var(--off-white);
  transition: transform 0.4s var(--ease);
}
.brand:hover .brand__mark {
  transform: rotate(-4deg) scale(1.05);
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}
.brand__name {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.brand__sub {
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}
.nav__link {
  position: relative;
  padding: 0.5rem 0.8rem;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--muted-strong);
  border-radius: var(--radius-sm);
  transition: color 0.25s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0.8rem;
  right: 0.8rem;
  bottom: 0.28rem;
  height: 2px;
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.3s var(--ease);
}
.nav__link:hover,
.nav__link.is-active {
  color: var(--off-white);
}
.nav__link.is-active::after,
.nav__link:hover::after {
  transform: scaleX(1);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  position: relative;
  flex: none;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 20px;
  height: 2px;
  background: var(--off-white);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease), top 0.3s var(--ease);
}
.nav-toggle span {
  top: 50%;
  margin-top: -1px;
}
.nav-toggle span::before {
  top: -7px;
}
.nav-toggle span::after {
  top: 7px;
}
.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: translateX(-50%) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: translateX(-50%) rotate(-45deg);
}

/* -----------------------------------------------------------------------
   9. HERO
   ----------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem) clamp(3.5rem, 8vw, 7rem);
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}
.hero__content {
  max-width: 40rem;
}
.hero h1 {
  font-size: var(--step-5);
  margin-top: 1.2rem;
  letter-spacing: -0.03em;
}
.hero h1 .accentword {
  color: var(--copper-bright);
  position: relative;
}
.hero__sub {
  font-size: var(--step-1);
  color: var(--muted-strong);
  margin-top: 1.4rem;
  max-width: 36rem;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}
.hero__trust {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 1.8rem;
  margin-top: 2.4rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  list-style: none;
  padding-left: 0;
}
.hero__trust li {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.94rem;
  color: var(--muted-strong);
  font-weight: 500;
}
.hero__trust svg {
  width: 20px;
  height: 20px;
  color: var(--copper);
  flex: none;
}

/* Hero-Visualisierung */
.hero__visual {
  position: relative;
  aspect-ratio: 5 / 4.2;
  perspective: 1200px;
}
.hero__stage {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 90% at 70% 0%, rgba(217, 104, 47, 0.12), transparent 60%),
    linear-gradient(170deg, var(--slate-800), var(--slate-950));
  box-shadow: var(--shadow-lg);
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out;
}
.hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero__layer {
  will-change: transform;
}
.hero__sun {
  position: absolute;
  width: 130px;
  height: 130px;
  top: 8%;
  right: 10%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(239, 122, 60, 0.5), transparent 68%);
  filter: blur(4px);
}
.hero__chip {
  position: absolute;
  left: 6%;
  bottom: 6%;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1rem;
  background: rgba(14, 17, 20, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--muted-strong);
  box-shadow: var(--shadow-sm);
}
.hero__chip svg {
  width: 16px;
  height: 16px;
  color: var(--copper);
}

/* animierte Dachlinien im Hero-SVG */
.draw-line {
  stroke-dasharray: var(--len, 1200);
  stroke-dashoffset: var(--len, 1200);
}
.is-revealed .draw-line,
.hero__svg .draw-line {
  animation: draw 2s var(--ease) forwards;
}

/* -----------------------------------------------------------------------
   10. SCHNELLAUSWAHL
   ----------------------------------------------------------------------- */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1rem;
}
.quick-card {
  text-align: left;
  padding: 1.5rem 1.3rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  min-height: 100%;
}
.quick-card:hover {
  transform: translateY(-5px);
  border-color: var(--copper);
  box-shadow: var(--shadow);
}
.quick-card__icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(217, 104, 47, 0.12);
  color: var(--copper-bright);
  border: 1px solid rgba(217, 104, 47, 0.25);
}
.quick-card__icon svg {
  width: 24px;
  height: 24px;
}
.quick-card h3 {
  font-size: 1.06rem;
}
.quick-card p {
  font-size: 0.9rem;
  color: var(--text-dim);
}
.quick-card__go {
  margin-top: auto;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--copper-bright);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.quick-card:hover .quick-card__go .btn__arrow {
  transform: translateX(4px);
}
.quick-card__go .btn__arrow {
  transition: transform 0.3s var(--ease);
}

/* -----------------------------------------------------------------------
   11. LEISTUNGEN
   ----------------------------------------------------------------------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
}
.service-card {
  position: relative;
  padding: 1.7rem 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease);
  transform-style: preserve-3d;
}
.service-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    340px circle at var(--mx, 50%) var(--my, 0%),
    rgba(217, 104, 47, 0.14),
    transparent 60%
  );
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}
.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}
.service-card:hover::before {
  opacity: 1;
}
.service-card__icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(160deg, var(--slate-700), var(--slate-900));
  border: 1px solid var(--line-strong);
  color: var(--copper-bright);
  margin-bottom: 1.1rem;
}
.service-card__icon svg {
  width: 28px;
  height: 28px;
}
.service-card h3 {
  font-size: 1.2rem;
}
.service-card__desc {
  color: var(--text-dim);
  font-size: 0.94rem;
  margin-top: 0.6rem;
}
.service-card__toggle {
  margin-top: 1.1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--copper-bright);
}
.service-card__toggle .chev {
  transition: transform 0.3s var(--ease);
}
.service-card__toggle[aria-expanded="true"] .chev {
  transform: rotate(180deg);
}
.service-card__detail {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease);
}
.service-card__detail > div {
  overflow: hidden;
}
.service-card__detail[data-open="true"] {
  grid-template-rows: 1fr;
}
.service-card__detail p {
  font-size: 0.9rem;
  color: var(--muted-strong);
  padding-top: 0.9rem;
  margin-top: 0.9rem;
  border-top: 1px solid var(--line);
}

/* -----------------------------------------------------------------------
   12. DACHWELT (Anatomie)
   ----------------------------------------------------------------------- */
.anatomy {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: stretch;
}
.anatomy__figure {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: linear-gradient(170deg, var(--slate-800), var(--slate-950));
  padding: 1.5rem;
  overflow: hidden;
}
.anatomy__svg {
  width: 100%;
  height: auto;
}
.hotspot {
  cursor: pointer;
  transition: transform 0.2s var(--ease);
}
.hotspot circle {
  fill: rgba(14, 17, 20, 0.85);
  stroke: var(--copper);
  stroke-width: 2;
  transition: fill 0.25s var(--ease), r 0.25s var(--ease);
}
.hotspot text {
  fill: var(--copper-bright);
  font-weight: 700;
  font-size: 15px;
  text-anchor: middle;
  dominant-baseline: central;
  font-family: var(--font-sans);
}
.hotspot:hover circle,
.hotspot.is-active circle {
  fill: var(--copper);
}
.hotspot:hover text,
.hotspot.is-active text {
  fill: #fff;
}
.hotspot:focus-visible {
  outline: none;
}
.hotspot:focus-visible circle {
  stroke: var(--copper-bright);
  stroke-width: 3.5;
}
.anatomy__panel {
  display: flex;
  flex-direction: column;
  padding: 1.6rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
}
.anatomy__panel-label {
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--copper-bright);
  font-weight: 600;
}
.anatomy__panel h3 {
  font-size: 1.5rem;
  margin-top: 0.5rem;
}
.anatomy__panel p {
  color: var(--text-dim);
  margin-top: 0.8rem;
  font-size: 0.96rem;
}
.anatomy__hint {
  margin-top: auto;
  padding-top: 1.2rem;
  font-size: 0.82rem;
  color: var(--muted);
}
.anatomy__dots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.2rem;
}
.anatomy__dot {
  padding: 0.35rem 0.75rem;
  border-radius: 100px;
  border: 1px solid var(--line-strong);
  font-size: 0.8rem;
  color: var(--muted-strong);
  transition: all 0.25s var(--ease);
}
.anatomy__dot.is-active {
  background: var(--copper);
  color: #fff;
  border-color: transparent;
}

/* -----------------------------------------------------------------------
   13. DACHARTEN
   ----------------------------------------------------------------------- */
.rooftype-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}
.rooftype {
  padding: 1.3rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--line);
  text-align: center;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.rooftype:hover {
  transform: translateY(-4px);
  border-color: var(--copper);
}
.rooftype svg {
  width: 100%;
  height: 84px;
  color: var(--muted-strong);
  margin-bottom: 0.8rem;
}
.rooftype:hover svg {
  color: var(--copper-bright);
}
.rooftype h3 {
  font-size: 1rem;
}

.rooftype-note {
  margin-top: 1.6rem;
  color: var(--text-dim);
  max-width: 46rem;
  font-size: 0.96rem;
}

/* -----------------------------------------------------------------------
   14. VORHER-NACHHER-SLIDER
   ----------------------------------------------------------------------- */
.compare {
  position: relative;
  max-width: 860px;
  margin-inline: auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 10;
  touch-action: pan-y;
  user-select: none;
}
.compare__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.compare__img svg {
  width: 100%;
  height: 100%;
}
.compare__after {
  clip-path: inset(0 0 0 var(--pos, 50%));
}
.compare__label {
  position: absolute;
  top: 1rem;
  padding: 0.35rem 0.85rem;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  background: rgba(14, 17, 20, 0.8);
  backdrop-filter: blur(6px);
  border: 1px solid var(--line-strong);
}
.compare__label--before {
  left: 1rem;
}
.compare__label--after {
  right: 1rem;
  color: var(--copper-bright);
}
.compare__handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--pos, 50%);
  width: 3px;
  background: var(--copper);
  transform: translateX(-50%);
  cursor: ew-resize;
}
.compare__grip {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--copper);
  display: grid;
  place-items: center;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
  color: #fff;
}
.compare__handle:focus-visible .compare__grip {
  outline: 3px solid #fff;
  outline-offset: 2px;
}
.compare__grip svg {
  width: 24px;
  height: 24px;
}

/* -----------------------------------------------------------------------
   15. GRUNDSÄTZE
   ----------------------------------------------------------------------- */
.principles {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}
.principle-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}
.principle-list li {
  display: flex;
  gap: 1rem;
  padding: 1.1rem 1.3rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--line);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.principle-list li:hover {
  border-color: var(--copper);
  transform: translateX(4px);
}
.principle-list__num {
  font-family: var(--font-mono);
  color: var(--copper-bright);
  font-weight: 700;
  flex: none;
}
.principle-list h3 {
  font-size: 1.05rem;
}
.principle-list p {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

/* -----------------------------------------------------------------------
   16. ÜBER UNS
   ----------------------------------------------------------------------- */
.about {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}
.about__portrait {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: linear-gradient(170deg, var(--slate-700), var(--slate-950));
  aspect-ratio: 4 / 5;
  display: grid;
  place-items: center;
}
.about__portrait svg {
  width: 65%;
  color: var(--slate-600);
}
.about__portrait-tag {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  right: 1rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  background: rgba(14, 17, 20, 0.8);
  backdrop-filter: blur(6px);
  border: 1px dashed var(--line-strong);
  font-size: 0.8rem;
  color: var(--muted-strong);
  text-align: center;
}
.about__body p {
  color: var(--muted-strong);
  font-size: var(--step-1);
}
.about__placeholders {
  list-style: none;
  padding: 0;
  margin-top: 1.6rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.7rem;
}
.about__placeholders li {
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  border: 1px dashed var(--line-strong);
  background: rgba(217, 104, 47, 0.04);
}
.about__placeholders span {
  display: block;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--copper-bright);
  margin-bottom: 0.2rem;
}
.about__placeholders strong {
  font-weight: 500;
  color: var(--muted);
  font-size: 0.9rem;
}

/* -----------------------------------------------------------------------
   17. PROJEKTE
   ----------------------------------------------------------------------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.8rem;
}
.filter-btn {
  padding: 0.55rem 1.1rem;
  border-radius: 100px;
  border: 1px solid var(--line-strong);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted-strong);
  transition: all 0.25s var(--ease);
}
.filter-btn:hover {
  border-color: var(--copper);
  color: var(--off-white);
}
.filter-btn.is-active {
  background: var(--copper);
  color: #fff;
  border-color: transparent;
}
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.3rem;
}
.project-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--slate-900);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease), opacity 0.4s var(--ease);
}
.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}
.project-card.is-hidden {
  display: none;
}
.project-card__media {
  position: relative;
  aspect-ratio: 16 / 11;
  overflow: hidden;
}
.project-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}
.project-card:hover .project-card__media img {
  transform: scale(1.05);
}
.project-card__tag {
  position: absolute;
  top: 0.9rem;
  left: 0.9rem;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(14, 17, 20, 0.82);
  backdrop-filter: blur(6px);
  border: 1px solid var(--line-strong);
  color: var(--copper-bright);
}
.project-card__body {
  padding: 1.2rem 1.3rem 1.4rem;
}
.project-card__body h3 {
  font-size: 1.1rem;
}
.project-card__body p {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-top: 0.4rem;
}

/* -----------------------------------------------------------------------
   18. ABLAUF
   ----------------------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1.2rem;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 1.6rem 1.4rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.step:hover {
  transform: translateY(-4px);
  border-color: var(--copper);
}
.step__num {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  color: rgba(217, 104, 47, 0.28);
  line-height: 1;
}
.step h3 {
  font-size: 1.1rem;
  margin-top: 0.6rem;
}
.step p {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}
.step__line {
  position: absolute;
  top: 2.6rem;
  right: -0.6rem;
  width: 1.2rem;
  height: 2px;
  background: var(--line-strong);
}
@media (max-width: 720px) {
  .step__line {
    display: none;
  }
}

/* -----------------------------------------------------------------------
   19. EINSATZGEBIET
   ----------------------------------------------------------------------- */
.area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}
.area__map {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: linear-gradient(170deg, var(--slate-800), var(--slate-950));
  padding: 1.5rem;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}
.area__map svg {
  width: 100%;
  height: 100%;
}
.area__node circle {
  fill: var(--copper);
}
.area__node text {
  fill: var(--muted-strong);
  font-size: 13px;
  font-family: var(--font-sans);
  font-weight: 500;
}
.area__node--hub circle {
  fill: var(--copper-bright);
}
.area__node--hub text {
  fill: var(--off-white);
  font-weight: 700;
  font-size: 16px;
}
.area__ring {
  fill: none;
  stroke: var(--line-strong);
  stroke-dasharray: 4 6;
}
.area__list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}
.area__list li {
  padding: 0.5rem 1rem;
  border-radius: 100px;
  border: 1px solid var(--line-strong);
  font-size: 0.9rem;
  color: var(--muted-strong);
}

/* -----------------------------------------------------------------------
   20. FAQ / AKKORDEON
   ----------------------------------------------------------------------- */
.faq {
  max-width: 820px;
  margin-inline: auto;
}
.accordion-item {
  border-bottom: 1px solid var(--line);
}
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.35rem 0.4rem;
  text-align: left;
  font-size: var(--step-1);
  font-weight: 600;
  transition: color 0.25s var(--ease);
}
.accordion-trigger:hover {
  color: var(--copper-bright);
}
.accordion-icon {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  position: relative;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.accordion-icon::before,
.accordion-icon::after {
  content: "";
  position: absolute;
  background: var(--copper-bright);
  border-radius: 2px;
  top: 50%;
  left: 50%;
  transition: transform 0.3s var(--ease);
}
.accordion-icon::before {
  width: 13px;
  height: 2px;
  transform: translate(-50%, -50%);
}
.accordion-icon::after {
  width: 2px;
  height: 13px;
  transform: translate(-50%, -50%);
}
.accordion-trigger[aria-expanded="true"] .accordion-icon {
  background: var(--copper);
  border-color: transparent;
}
.accordion-trigger[aria-expanded="true"] .accordion-icon::before,
.accordion-trigger[aria-expanded="true"] .accordion-icon::after {
  background: #fff;
}
.accordion-trigger[aria-expanded="true"] .accordion-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}
.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease);
}
.accordion-panel > div {
  overflow: hidden;
}
.accordion-panel[data-open="true"] {
  grid-template-rows: 1fr;
}
.accordion-panel p {
  color: var(--text-dim);
  padding: 0 0.4rem 1.4rem;
  max-width: 62ch;
}

/* -----------------------------------------------------------------------
   21. CTA-BANNER
   ----------------------------------------------------------------------- */
.cta-banner {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  padding: clamp(2.4rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(217, 104, 47, 0.22), transparent 55%),
    linear-gradient(160deg, var(--slate-800), var(--blueblack));
  border: 1px solid var(--line-strong);
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.cta-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("assets/roof-grid.svg");
  background-size: cover;
  color: rgba(200, 210, 220, 0.5);
  opacity: 0.07;
  pointer-events: none;
}
.cta-banner h2 {
  font-size: var(--step-4);
  max-width: 20ch;
  margin-inline: auto;
  position: relative;
}
.cta-banner p {
  color: var(--muted-strong);
  max-width: 46ch;
  margin: 1.2rem auto 0;
  font-size: var(--step-1);
  position: relative;
}
.cta-banner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: center;
  margin-top: 2rem;
  position: relative;
}

/* -----------------------------------------------------------------------
   22. KONTAKTFORMULAR
   ----------------------------------------------------------------------- */
.contact {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(1.6rem, 4vw, 3.2rem);
  align-items: start;
}
.contact__aside h2 {
  font-size: var(--step-3);
}
.contact__aside p {
  color: var(--text-dim);
  margin-top: 1rem;
}
.contact__info {
  list-style: none;
  padding: 0;
  margin-top: 1.8rem;
  display: grid;
  gap: 0.9rem;
}
.contact__info li {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}
.contact__info svg {
  width: 22px;
  height: 22px;
  color: var(--copper);
  flex: none;
  margin-top: 0.15rem;
}
.contact__info span {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
}
.contact__info strong {
  font-weight: 500;
}

.form {
  padding: clamp(1.4rem, 3vw, 2.2rem);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
}
.form__demo-flag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--copper-bright);
  margin-bottom: 1.4rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid rgba(217, 104, 47, 0.3);
  border-radius: 100px;
  background: rgba(217, 104, 47, 0.06);
}
.form__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.field--full {
  grid-column: 1 / -1;
}
.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted-strong);
}
.field .req {
  color: var(--copper-bright);
}
.field input,
.field select,
.field textarea {
  background: var(--slate-950);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  width: 100%;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px var(--copper-glow);
}
.field textarea {
  resize: vertical;
  min-height: 110px;
}
.field select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 20px) center, calc(100% - 15px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2.4rem;
}
.checkbox {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  font-size: 0.86rem;
  color: var(--text-dim);
  cursor: pointer;
}
.checkbox input {
  width: 20px;
  height: 20px;
  accent-color: var(--copper);
  flex: none;
  margin-top: 0.1rem;
}
.form__submit {
  margin-top: 1.4rem;
}
.form__hint {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.9rem;
  text-align: center;
}

/* -----------------------------------------------------------------------
   23. TOAST
   ----------------------------------------------------------------------- */
.toast-wrap {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 1.2rem);
  transform: translateX(-50%);
  z-index: 2500;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  width: min(440px, calc(100vw - 2rem));
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  background: var(--slate-800);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateY(24px);
  opacity: 0;
  transition: transform 0.4s var(--ease), opacity 0.4s var(--ease);
}
.toast.is-visible {
  transform: translateY(0);
  opacity: 1;
}
.toast__icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: rgba(217, 104, 47, 0.14);
  color: var(--copper-bright);
  flex: none;
}
.toast__icon svg {
  width: 20px;
  height: 20px;
}
.toast__body strong {
  display: block;
  font-size: 0.94rem;
}
.toast__body p {
  font-size: 0.84rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}
.toast__close {
  margin-left: auto;
  color: var(--muted);
  font-size: 1.3rem;
  line-height: 1;
  padding: 0.1rem 0.3rem;
  flex: none;
}
.toast__close:hover {
  color: var(--off-white);
}

/* -----------------------------------------------------------------------
   24. MOBILE KONTAKTLEISTE
   ----------------------------------------------------------------------- */
.mobile-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1400;
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line-strong);
  backdrop-filter: blur(12px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.mobile-bar button {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.7rem 0.4rem;
  background: rgba(16, 21, 27, 0.94);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted-strong);
}
.mobile-bar button svg {
  width: 22px;
  height: 22px;
}
.mobile-bar button.is-primary {
  background: var(--copper);
  color: #fff;
}

/* -----------------------------------------------------------------------
   25. MODAL / DRAWER
   ----------------------------------------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 2200;
  display: grid;
  place-items: end center;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.35s var(--ease), visibility 0.35s var(--ease);
}
.modal.is-open {
  visibility: visible;
  opacity: 1;
}
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 9, 12, 0.72);
  backdrop-filter: blur(4px);
}
.modal__dialog {
  position: relative;
  width: min(720px, 100%);
  max-height: 88vh;
  overflow-y: auto;
  background: var(--slate-900);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: clamp(1.6rem, 4vw, 2.6rem);
  transform: translateY(40px);
  transition: transform 0.4s var(--ease);
  box-shadow: var(--shadow-lg);
}
.modal.is-open .modal__dialog {
  transform: translateY(0);
}
@media (min-width: 720px) {
  .modal {
    place-items: center;
  }
  .modal__dialog {
    border-radius: var(--radius-xl);
  }
}
.modal__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.2rem;
}
.modal__head h2 {
  font-size: var(--step-2);
}
.modal__close {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--muted-strong);
  flex: none;
}
.modal__close:hover {
  border-color: var(--copper);
  color: var(--off-white);
}
.modal__body h3 {
  font-size: 1.05rem;
  margin-top: 1.4rem;
  margin-bottom: 0.3rem;
}
.modal__body p,
.modal__body li {
  color: var(--text-dim);
  font-size: 0.94rem;
}
.modal__body ul {
  padding-left: 1.2rem;
  margin-top: 0.4rem;
}
.modal__demo-note {
  padding: 1rem 1.2rem;
  border-radius: var(--radius);
  border: 1px dashed var(--copper);
  background: rgba(217, 104, 47, 0.07);
  color: var(--muted-strong);
  font-size: 0.9rem;
  margin-bottom: 1.4rem;
}

body.no-scroll {
  overflow: hidden;
}

/* -----------------------------------------------------------------------
   26. MOBILE NAV PANEL
   ----------------------------------------------------------------------- */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 1450;
  visibility: hidden;
  pointer-events: none;
}
.mobile-nav.is-open {
  visibility: visible;
  pointer-events: auto;
}
.mobile-nav__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 9, 12, 0.6);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}
.mobile-nav.is-open .mobile-nav__backdrop {
  opacity: 1;
}
.mobile-nav__panel {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: min(360px, 86vw);
  background: linear-gradient(200deg, var(--slate-850), var(--blueblack));
  border-left: 1px solid var(--line-strong);
  padding: calc(var(--header-h) + 1rem) 1.6rem 2rem;
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.mobile-nav.is-open .mobile-nav__panel {
  transform: translateX(0);
}
.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.2rem;
  font-size: 1.25rem;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
  color: var(--muted-strong);
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}
.mobile-nav__link:hover,
.mobile-nav__link:focus-visible {
  color: var(--off-white);
  padding-left: 0.7rem;
}
.mobile-nav__link .num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--copper);
}
.mobile-nav__cta {
  margin-top: 1.6rem;
}
.mobile-nav__foot {
  margin-top: auto;
  padding-top: 1.6rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* -----------------------------------------------------------------------
   27. FOOTER
   ----------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--line);
  padding-top: clamp(3rem, 6vw, 5rem);
  padding-bottom: 2rem;
  background: linear-gradient(180deg, transparent, rgba(10, 13, 16, 0.6));
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 2rem;
}
.footer__brandcol .brand {
  margin-bottom: 1rem;
}
.footer__claim {
  color: var(--text-dim);
  max-width: 30ch;
  font-size: 0.94rem;
}
.footer__col h4 {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}
.footer__col ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.footer__col a,
.footer__col span {
  color: var(--muted-strong);
  font-size: 0.92rem;
  transition: color 0.25s var(--ease);
}
.footer__col a:hover {
  color: var(--copper-bright);
}
.footer__placeholder {
  color: var(--muted);
  font-style: italic;
  font-size: 0.86rem;
}
.footer__bottom {
  margin-top: clamp(2.4rem, 5vw, 3.5rem);
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.footer__demo {
  font-size: 0.82rem;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.footer__demo::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--copper);
}
.footer__versivion {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.86rem;
  color: var(--muted);
}
.versivion-mark {
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--off-white);
  background: linear-gradient(120deg, var(--off-white), var(--copper-bright));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* -----------------------------------------------------------------------
   28. BACK-TO-TOP
   ----------------------------------------------------------------------- */
.to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.4rem;
  z-index: 1350;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--slate-800);
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  color: var(--off-white);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: all 0.3s var(--ease);
}
.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover {
  background: var(--copper);
  border-color: transparent;
}
.to-top svg {
  width: 22px;
  height: 22px;
}

/* -----------------------------------------------------------------------
   29. REVEAL-ANIMATIONEN
   ----------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
[data-reveal="mask"] {
  transform: translateY(40px);
  clip-path: inset(0 0 100% 0);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  clip-path: inset(0 0 0 0);
}
[data-reveal-delay="1"] {
  transition-delay: 0.08s;
}
[data-reveal-delay="2"] {
  transition-delay: 0.16s;
}
[data-reveal-delay="3"] {
  transition-delay: 0.24s;
}
[data-reveal-delay="4"] {
  transition-delay: 0.32s;
}

/* -----------------------------------------------------------------------
   30. RESPONSIVE
   ----------------------------------------------------------------------- */
@media (max-width: 1000px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }
  .hero__visual {
    order: -1;
    max-width: 560px;
    width: 100%;
    margin-inline: auto;
  }
  .anatomy,
  .principles,
  .about,
  .area,
  .contact {
    grid-template-columns: 1fr;
  }
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 860px) {
  .nav,
  .header__actions .btn {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
  .mobile-bar {
    display: grid;
  }
  body {
    padding-bottom: 66px;
  }
  .to-top {
    bottom: calc(66px + env(safe-area-inset-bottom, 0px) + 0.8rem);
  }
}

@media (max-width: 560px) {
  .form__grid {
    grid-template-columns: 1fr;
  }
  .footer__grid {
    grid-template-columns: 1fr;
  }
  .hero__trust {
    gap: 0.8rem 1.4rem;
  }
  .topbar__inner {
    justify-content: center;
  }
  .cta-banner__actions .btn,
  .hero__cta .btn {
    width: 100%;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 1rem;
  }
}

/* -----------------------------------------------------------------------
   31. REDUCED MOTION
   ----------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
  }
  .draw-line {
    stroke-dashoffset: 0 !important;
  }
  .loader {
    display: none !important;
  }
  .topbar__status {
    animation: none !important;
  }
}

/* Print — sichere Grundausgabe */
@media print {
  .header,
  .mobile-bar,
  .to-top,
  .loader,
  .scroll-progress,
  .topbar {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
}