/* =========================
   SystemDach – Design System CSS
   =========================
   1. CSS Reset / Base
   2. Root Variables
   3. Typography
   4. Layout / Containers / Grid
   5. Header / Navigation
   6. Buttons
   7. Hero
   8. Section Patterns
   9. Cards
   10. Technical Blocks
   11. Process Blocks
   12. CTA Blocks
   13. Forms
   14. Footer
   15. Utilities
   16. Responsive Rules
   ========================= */

/* =========================
   FONTS
   ========================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* =========================
   1. CSS Reset / Base
   ========================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-base);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

ul, ol { list-style: none; margin: 0; padding: 0; }

/* =========================
   2. Root Variables
   ========================= */
:root {
  --bg: #f3f2ee;
  --bg-soft: #ece9e2;
  --surface: #ffffff;
  --surface-muted: #f7f6f2;
  --surface-dark: #202327;

  --text: #1d1f21;
  --text-soft: #5c6166;
  --text-inverse: #f5f4ef;

  --border: #d7d2c8;
  --border-strong: #bdb6aa;

  --accent: #d96f32;
  --accent-hover: #bf5f29;
  --accent-light: rgba(217, 111, 50, 0.1);
  --accent-secondary: #2f5d73;

  --success: #2f6b4f;
  --error: #9f3a32;

  --shadow-sm: 0 8px 24px rgba(20, 24, 28, 0.06);
  --shadow-md: 0 18px 44px rgba(20, 24, 28, 0.08);
  --shadow-lg: 0 30px 70px rgba(20, 24, 28, 0.12);

  --radius-sm:  10px;
  --radius-md:  14px;
  --radius-lg:  18px;
  --radius-xl:  24px;

  --container:        1360px;
  --container-wide:   1440px;
  --container-narrow: 820px;

  --space-1:  8px;
  --space-2:  12px;
  --space-3:  16px;
  --space-4:  20px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  40px;
  --space-8:  56px;
  --space-9:  72px;
  --space-10: 96px;
  --space-11: 120px;
  --space-12: 144px;

  --font-base:    "Inter", Arial, sans-serif;
  --font-display: "Inter", Arial, sans-serif;

  --transition-fast: 180ms ease;
  --transition-base: 260ms ease;
}

/* =========================
   3. Typography
   ========================= */
h1, h2, h3, h4 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  color: var(--text);
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  line-height: 0.98;
  font-weight: 800;
  max-width: 14ch;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.04;
  font-weight: 800;
  max-width: 20ch;
}

h3 {
  font-size: clamp(1.35rem, 2vw, 1.85rem);
  line-height: 1.15;
  font-weight: 700;
}

h4 { font-size: 1.15rem; font-weight: 700; margin: 0 0 var(--space-3); }

p {
  margin: 0 0 var(--space-4);
  color: var(--text-soft);
}
p:last-child { margin-bottom: 0; }

strong { color: var(--text); }

.lead {
  font-size: 1.18rem;
  line-height: 1.7;
  max-width: 46rem;
  color: var(--text-soft);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-4);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.text-inverse h1,
.text-inverse h2,
.text-inverse h3,
.text-inverse p {
  color: var(--text-inverse);
}

/* =========================
   4. Layout / Containers / Grid
   ========================= */
.container {
  width: min(100% - 48px, var(--container));
  margin: 0 auto;
}

.container-wide {
  width: min(100% - 48px, var(--container-wide));
  margin: 0 auto;
}

.container-narrow {
  width: min(100% - 48px, var(--container-narrow));
  margin: 0 auto;
}

/* Legacy helpers */
.max-w-800 { max-width: 800px; }

/* Section rhythms */
.section {
  padding: var(--space-11) 0;
}

.section-compact {
  padding: var(--space-9) 0;
}

.section-padding {
  padding: var(--space-10) 0;
}

.section-padding-sm {
  padding: var(--space-8) 0;
}

.section-dark {
  background: var(--surface-dark);
  color: var(--text-inverse);
}

.section-surface {
  background: var(--surface);
}

.section-muted,
.bg-light {
  background: var(--surface-muted);
}

.bg-base { background: var(--bg); }
.bg-dark { background: var(--surface-dark); }

/* Section header two-column intro */
.section-head {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--space-8);
  align-items: end;
  margin-bottom: var(--space-8);
}
.section-head p { max-width: 42rem; }

/* Standalone section header */
.section-header {
  margin-bottom: var(--space-8);
}
.section-header h2 { max-width: 680px; }
.section-header p {
  margin-top: var(--space-3);
  font-size: 1.1rem;
  max-width: 600px;
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-7);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
}

/* Legacy aliases */
.grid-2-col { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: var(--space-7); }
.grid-3-col { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: var(--space-6); }
.gap-lg { gap: var(--space-10); }
.align-start { align-items: start; }

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-8);
  align-items: center;
}

.split-reverse {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-8);
  align-items: center;
}

/* Borders */
.border-bottom { border-bottom: 1px solid var(--border); }
.border-top    { border-top:    1px solid var(--border); }
.border        { border: 1px solid var(--border); border-radius: var(--radius-lg); }

/* Spacing helpers */
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-7 { margin-top: var(--space-7); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.p-4  { padding: var(--space-5); }

/* =========================
   5. Header / Navigation
   ========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(243, 242, 238, 0.88);
  border-bottom: 1px solid rgba(189, 182, 170, 0.35);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background: rgba(243, 242, 238, 0.96);
  border-bottom-color: rgba(189, 182, 170, 0.6);
  box-shadow: 0 2px 24px rgba(20, 24, 28, 0.07);
}

/* Support both inner-div class names */
.site-header .container,
.site-header__inner {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-logo,
.logo {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-weight: 800;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}

.site-logo img,
.logo img { height: 34px; width: auto; }

.logo-text,
.footer-logo-text {
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.04em;
}

.site-nav,
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav ul,
.main-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav a,
.main-nav a {
  position: relative;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.main-nav a:hover,
.main-nav a.active {
  color: var(--accent);
  background: var(--accent-light);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* =========================
   6. Buttons
   ========================= */
.btn-row,
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-outline,
.btn-inverse {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 0 28px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  font-family: var(--font-base);
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: transform var(--transition-fast), background var(--transition-fast),
              border-color var(--transition-fast), color var(--transition-fast),
              box-shadow var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  user-select: none;
}

.btn:hover,
.btn-primary:hover,
.btn-secondary:hover,
.btn-outline:hover,
.btn-inverse:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary,
.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-secondary:hover,
.btn-secondary:focus-visible,
.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--text);
}

.btn-inverse,
.btn-outline-light {
  background: transparent;
  color: rgba(245, 244, 239, 0.72);
  border-color: rgba(255,255,255,0.2);
}
.btn-inverse:hover,
.btn-outline-light:hover {
  color: var(--text-inverse);
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.08);
}

/* Header CTA pill */
.main-nav .btn-primary {
  min-height: 44px;
  padding: 0 20px;
  font-size: 0.9rem;
}

/* =========================
   7. Hero
   ========================= */
.hero {
  padding: var(--space-10) 0 var(--space-11);
  position: relative;
  overflow: hidden;
}

/* Subtle grid overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(29,31,33,0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29,31,33,0.035) 1px, transparent 1px);
  background-size: 88px 88px;
  pointer-events: none;
}

.hero .container { position: relative; }

.hero__grid,
.hero-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-8);
  align-items: center;
}

.hero__content,
.hero-content {
  max-width: 720px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: var(--space-5);
}
.hero-eyebrow::before {
  content: '';
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--accent);
  flex-shrink: 0;
}

.hero h1,
.hero-h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  line-height: 0.98;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
  max-width: 14ch;
}

.hero h1 em,
.hero-h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-subheadline {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 42rem;
  margin-bottom: 0;
}

/* Proof points */
.hero__proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-7);
}

.hero__proof-item {
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--text-soft);
  font-weight: 500;
}
.hero__proof-item strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
  font-size: 1rem;
}

/* Simple proof list (index.html style) */
.hero-proof-points {
  margin-top: var(--space-7);
  border-top: 1px solid var(--border);
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.hero-proof-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-soft);
}
.hero-proof-item::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 0;
}

/* Hero media */
.hero__media,
.hero-visual {
  position: relative;
}

.hero__media-frame,
.hero-visual-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--surface-dark);
  min-height: 520px;
  box-shadow: var(--shadow-lg);
}
.hero__media-frame img,
.hero-visual-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(20,24,28,0.06), rgba(20,24,28,0.32)),
    linear-gradient(135deg, rgba(217,111,50,0.1), rgba(47,93,115,0.05));
}

/* =========================
   8. Section Patterns
   ========================= */
.page-header {
  padding: clamp(3rem, 6vw, 5rem) 0 clamp(2.5rem, 4vw, 4rem);
}
.page-header h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  max-width: 820px;
  margin-bottom: var(--space-5);
}

.intro-text {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 720px;
  margin: 0;
}

.content-block { max-width: 740px; }
.content-block p { font-size: 1.1rem; color: var(--text-soft); }

/* Value statement */
.value-statement {
  padding: var(--space-4) var(--space-5);
  border-left: 3px solid var(--accent);
  background: var(--accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.value-statement strong { font-size: 1rem; line-height: 1.55; color: var(--text); }

/* Note box */
.note-box {
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
  font-size: 0.95rem;
  color: var(--text-soft);
}

/* Process step inner pages */
.step-layout { max-width: 800px; }

/* =========================
   9. Cards
   ========================= */

/* General card */
.card {
  height: 100%;
  padding: 32px;
  background: var(--surface);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
              border-color var(--transition-fast);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(217, 111, 50, 0.35);
}

.card__meta {
  margin-bottom: var(--space-3);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.card h3 { margin-bottom: var(--space-3); }
.card p:last-child { margin-bottom: 0; }

.card--dark {
  background: var(--surface-dark);
  border-color: rgba(255,255,255,0.08);
}
.card--dark h3, .card--dark p { color: var(--text-inverse); }

/* Numbered card (problem, process pillars) */
.number-card,
.problem-card {
  position: relative;
  padding: 36px 32px 32px;
  background: var(--surface);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.number-card:hover,
.problem-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.number-card__number,
.problem-card-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.number-card h3,
.problem-card h3 { margin-bottom: var(--space-3); }

/* Application cards */
.application-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }

.application-card {
  background: var(--surface);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: block;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.application-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.application-card-image {
  aspect-ratio: 16/9;
  overflow: hidden;
}
.application-card-image img { width: 100%; height: 100%; object-fit: cover; }

.application-card-body { padding: 28px; }
.application-card-body h3 { font-size: 1.25rem; margin-bottom: var(--space-2); }
.application-card-body p  { font-size: 0.95rem; margin-bottom: var(--space-4); }

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
}
.card-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}
.application-card:hover .card-link::after { transform: translateX(3px); }

/* Zielgruppen cards */
.zielgruppen-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
.zielgruppen-card {
  background: var(--surface);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.zielgruppen-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.zielgruppen-card h2 { font-size: 1.5rem; margin-bottom: var(--space-3); }

/* Example cards */
.example-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.example-card {
  background: var(--surface-muted);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.example-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.example-card h2 {
  font-size: 1.25rem;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-4);
}

/* System pillars */
.system-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.pillar-item {
  padding: var(--space-8) var(--space-7);
  transition: background var(--transition-fast);
}
.pillar-item:not(:last-child) { border-right: 1px solid var(--border); }
.pillar-item:hover { background: var(--surface-muted); }

.pillar-number {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
}
.pillar-item h3 { font-size: 1.35rem; margin-bottom: var(--space-3); }
.pillar-item p  { font-size: 0.95rem; }

/* =========================
   10. Technical Blocks
   ========================= */
.tech-panel {
  padding: 36px;
  background: var(--surface);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.tech-diagram {
  padding: 28px;
  background: linear-gradient(180deg, #f8f7f3, #efebe3);
  border: 1px solid rgba(189, 182, 170, 0.45);
  border-radius: var(--radius-lg);
}

.tech-list,
.technical-list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}
.tech-list li,
.technical-list li {
  padding-left: 22px;
  position: relative;
  color: var(--text-soft);
  font-size: 0.96rem;
  line-height: 1.55;
}
.tech-list li::before,
.technical-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
}

.attributes-box {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.attributes-box .h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-soft);
  display: block;
  margin-bottom: var(--space-3);
}

.audience-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.audience-list li {
  font-size: 1rem;
  color: var(--text-soft);
  line-height: 1.55;
  padding-left: var(--space-4);
  border-left: 2px solid var(--border);
  transition: border-color var(--transition-fast);
}
.audience-list li:hover { border-left-color: var(--accent); }

.technik-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.technik-diagram {
  background: var(--surface-dark);
  border-radius: var(--radius-xl);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* =========================
   11. Process Blocks
   ========================= */
.process-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.process-step {
  padding: var(--space-8) var(--space-6);
  position: relative;
  transition: background var(--transition-fast);
}
.process-step:not(:last-child) { border-right: 1px solid var(--border); }
.process-step:hover { background: var(--surface-muted); }

.process-step-number {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
  display: block;
}
.process-step h3 { font-size: 1rem; margin-bottom: var(--space-2); }
.process-step p  { font-size: 0.9rem; }

/* =========================
   12. CTA Blocks
   ========================= */
.cta-block,
.cta-section {
  padding: var(--space-10) 0;
  background: var(--surface-dark);
  color: var(--text-inverse);
  position: relative;
  overflow: hidden;
}

.cta-block::before,
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.cta-block .container,
.cta-block .container-narrow,
.cta-section .container {
  position: relative;
}

.cta-section h2,
.cta-block h2 {
  color: var(--text-inverse);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  max-width: 640px;
}
.text-center .cta-section h2,
.cta-section.text-center h2 { margin: 0 auto; }

.cta-text {
  color: rgba(245, 244, 239, 0.62);
  font-size: 1.1rem;
  line-height: 1.65;
  max-width: 580px;
  margin-top: var(--space-3);
}
.text-center .cta-text { margin-left: auto; margin-right: auto; }

/* =========================
   13. Forms
   ========================= */
.form-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: var(--space-8);
  align-items: start;
}

.form-panel {
  padding: 36px;
  background: var(--surface);
  border: 1px solid rgba(189, 182, 170, 0.55);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label,
.form-group label {
  display: block;
  margin-bottom: 10px;
  color: var(--text);
  font-size: 0.96rem;
  font-weight: 700;
}

.form-input,
.form-group input,
.form-group select,
.form-textarea,
.form-group textarea {
  width: 100%;
  min-height: 58px;
  padding: 0 18px;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.96rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  appearance: none;
}

.form-textarea,
.form-group textarea {
  min-height: 160px;
  padding: 16px 18px;
  resize: vertical;
}

.form-input:focus,
.form-group input:focus,
.form-group select:focus,
.form-textarea:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(217, 111, 50, 0.12);
}

.form-input::placeholder,
.form-group input::placeholder,
.form-group textarea::placeholder { color: #a8a39c; }

.form-help {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--text-soft);
}
.form-error {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--error);
  font-weight: 600;
}
.form-success {
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(47, 107, 79, 0.1);
  color: var(--success);
  font-weight: 600;
  font-size: 0.96rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-submit { margin-top: var(--space-5); }
.form-submit .btn-primary,
.form-submit button {
  width: 100%;
  justify-content: center;
  padding: 0 28px;
  min-height: 60px;
  font-size: 1rem;
  border-radius: 14px;
}

.form-note {
  margin-top: var(--space-3);
  font-size: 0.82rem;
  color: var(--text-soft);
  text-align: center;
}

/* =========================
   14. Footer
   ========================= */
.site-footer {
  padding: var(--space-10) 0 var(--space-8);
  background: #eae6dd;
  border-top: 1px solid rgba(189, 182, 170, 0.5);
}

.footer-grid,
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.8fr;
  gap: var(--space-7);
  margin-bottom: var(--space-9);
}

.footer-logo { margin-bottom: var(--space-4); }
.footer-logo img { height: 28px; }
.footer-logo-text { font-size: 1.18rem; font-weight: 800; color: var(--text); letter-spacing: -0.04em; }

.footer-contact {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-soft);
}
.footer-contact strong { color: var(--text); font-weight: 700; }
.footer-contact a { color: var(--text-soft); transition: color var(--transition-fast); }
.footer-contact a:hover { color: var(--accent); }

.footer-nav-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: var(--space-4);
  display: block;
}

.footer-links ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-links a { font-size: 0.95rem; color: var(--text-soft); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.86rem;
  color: var(--text-soft);
}
.footer-bottom-links { display: flex; gap: var(--space-5); }
.footer-bottom-links a { color: var(--text-soft); transition: color var(--transition-fast); }
.footer-bottom-links a:hover { color: var(--accent); }

/* =========================
   15. Utilities
   ========================= */
.text-center  { text-align: center; }
.text-left    { text-align: left; }
.text-inverse { color: var(--text-inverse); }
.text-muted   { color: var(--text-soft); }
.text-accent  { color: var(--accent); }
.text-small   { font-size: 0.9rem; }

.max-text        { max-width: 46rem; }
.max-text-narrow { max-width: 34rem; }

.surface {
  background: var(--surface);
  border-radius: var(--radius-xl);
}

.shadow-lg { box-shadow: var(--shadow-lg); }

/* Scroll-reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Contact page */
.contact-details {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  line-height: 1.9;
}
.contact-details a { color: var(--accent); font-weight: 500; }
.contact-note {
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  background: var(--surface);
}

/* Legal pages */
.legal-content-section h2 { font-size: 1.85rem; font-weight: 700; }
.legal-content-section a  { color: var(--accent); }
.legal-content-section p  { color: var(--text-soft); font-size: 1rem; }

/* 404 */
.page-404 {
  min-height: 65vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.page-404 h1 { font-size: clamp(2rem, 5vw, 3rem); margin: var(--space-4) 0; }
.page-404 p  { max-width: 460px; margin: 0 auto var(--space-8); }

/* Misc */
.divider        { height: 1px; background: var(--border); margin: var(--space-7) 0; }
.divider-mobile { display: none; }
.mt-4-mobile    {}

/* =========================
   16. Responsive Rules
   ========================= */
@media (max-width: 1200px) {
  .hero__grid,
  .hero-layout,
  .split,
  .split-reverse,
  .section-head,
  .form-layout,
  .technik-split {
    grid-template-columns: 1fr;
  }

  .hero__media,
  .hero-visual { display: none; }

  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .process-steps-grid { grid-template-columns: repeat(2, 1fr); }
  .process-step:not(:last-child) { border-right: none; }
  .process-step:nth-child(odd)   { border-right: 1px solid var(--border); }
  .process-step:nth-child(1),
  .process-step:nth-child(2) { border-bottom: 1px solid var(--border); }
}

@media (max-width: 900px) {
  body { font-size: 17px; }

  .site-nav,
  .main-nav {
    position: fixed;
    top: 84px;
    left: 0; right: 0;
    background: rgba(243, 242, 238, 0.97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-md);
    padding: var(--space-5) 24px;
  }
  .site-nav.open,
  .main-nav.open {
    transform: translateY(0);
  }
  .site-nav ul,
  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav a,
  .main-nav a {
    display: block;
    padding: 0.875rem 0;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }
  .main-nav li:last-child a { border-bottom: none; }
  .main-nav .btn-primary { margin-top: var(--space-3); text-align: center; border-radius: 999px; }
  .nav-toggle { display: flex; }

  .grid-3, .system-pillars,
  .application-cards,
  .zielgruppen-grid,
  .example-grid {
    grid-template-columns: 1fr;
  }
  .system-pillars .pillar-item:not(:last-child) { border-right: none; border-bottom: 1px solid var(--border); }

  .grid-2, .grid-2-col { grid-template-columns: 1fr; }

  .section, .section-padding { padding: var(--space-9) 0; }
  .hero { padding: var(--space-8) 0 var(--space-9); }

  .footer-grid,
  .site-footer__grid { grid-template-columns: 1fr; gap: var(--space-7); }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}

@media (max-width: 640px) {
  .container,
  .container-wide,
  .container-narrow {
    width: min(100% - 28px, var(--container));
  }

  .card,
  .number-card,
  .problem-card,
  .form-panel,
  .tech-panel,
  .cta-block { padding: 24px; }

  .btn-group,
  .btn-row { flex-direction: column; }

  .site-header .container,
  .site-header__inner { min-height: 72px; }

  .form-row { grid-template-columns: 1fr; }
  .form-submit .btn-primary,
  .form-submit button { width: 100%; }

  .process-steps-grid { grid-template-columns: 1fr; }
  .process-step:not(:last-child) { border-right: none; border-bottom: 1px solid var(--border); }

  .divider-mobile { display: block; height: 1px; background: var(--border); }
  .mt-4-mobile { margin-top: var(--space-4); }
}

/* =========================
   HOMEPAGE REDESIGN — NEW COMPONENTS
   ========================= */

/* Hero tagline */
.hero-tagline {
  margin: 0 0 var(--space-3);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.03em;
}

/* Micro proof */
.hero-micro-proof {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.micro-proof-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
}
.micro-proof-dot {
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* Hero engineering diagram */
.hero-diagram {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #14181C;
  box-shadow: var(--shadow-lg);
  padding: var(--space-7);
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-diagram::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 30%, rgba(217,111,50,0.08), transparent 60%);
  pointer-events: none;
}
.eng-diagram { width: 100%; }

/* Problem grid — horizontal numbered rows */
.problem-grid-large {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.problem-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-7);
  align-items: start;
  padding: var(--space-8);
  transition: background var(--transition-fast);
}
.problem-item:not(:last-child) {
  border-bottom: 1px solid var(--border);
}
.problem-item:hover { background: var(--surface-muted); }
.problem-num {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(29,31,33,0.06);
  letter-spacing: -0.05em;
  font-family: var(--font-display);
  padding-top: 4px;
}
.problem-body h3 { font-size: 1.35rem; margin-bottom: var(--space-2); }
.problem-body p { font-size: 1rem; max-width: 640px; }

/* System logic split */
.system-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
}
.system-split-text h2 { max-width: 600px; }
.system-proof-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: 0;
}
.system-proof-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}
.system-proof-list li::before {
  content: '';
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* System visual box — layer stack */
.system-visual-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.sys-diagram-label {
  padding: 16px 24px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
  border-bottom: 1px solid var(--border);
}
.sys-diagram-layers { display: flex; flex-direction: column; }
.sys-layer {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  gap: var(--space-4);
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-fast);
}
.sys-layer:last-child { border-bottom: none; }
.sys-layer:hover { background: var(--surface-muted); }
.sys-layer--accent { background: rgba(217,111,50,0.05); }
.sys-layer--active { background: rgba(217,111,50,0.1); }
.sys-layer--base { background: var(--surface-muted); }
.sys-layer-num {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.sys-layer-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}

/* Tech proof section */
.tech-proof-section {
  padding: var(--space-11) 0;
  background: #14181C;
  position: relative;
  overflow: hidden;
}
.tech-proof-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.tech-proof-section::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 400px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(217,111,50,0.07), transparent 70%);
  pointer-events: none;
}
.tech-proof-head {
  max-width: 680px;
  margin-bottom: var(--space-10);
  position: relative;
}
.tech-proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
}
.tech-proof-item {
  padding: 36px 32px;
  background: #14181C;
  transition: background var(--transition-fast);
}
.tech-proof-item:hover { background: #1a1e22; }
.tech-proof-code {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: var(--space-4);
}
.tech-proof-item h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-inverse);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}
.tech-proof-item p {
  font-size: 0.9rem;
  color: rgba(245,244,239,0.5);
  line-height: 1.65;
}
.tech-proof-cta {
  padding: 36px 32px;
  background: rgba(217,111,50,0.08);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-4);
  border-left: 1px solid rgba(217,111,50,0.2);
}
.tech-proof-cta p {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-inverse);
  margin: 0;
}

/* Applications architectural grid */
.applications-arch-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.app-arch-card {
  display: block;
  background: var(--surface);
  border: 1px solid rgba(189,182,170,0.55);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.app-arch-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(217,111,50,0.3);
}
.app-arch-visual {
  height: 200px;
  position: relative;
  overflow: hidden;
}
.app-arch-visual--1 {
  background: url('../images/app-sanierung.jpg') center/cover no-repeat;
}
.app-arch-visual--2 {
  background: url('../images/app-ausbau.jpg') center/cover no-repeat;
}
.app-arch-visual--3 {
  background: url('../images/app-aufstockung.jpg') center/cover no-repeat;
}
/* Structural line overlay for engineering feel */
.app-arch-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(-45deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 28px 28px;
}
.app-arch-body {
  padding: 28px;
}
.app-arch-num {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}
.app-arch-body h3 { font-size: 1.25rem; margin-bottom: var(--space-2); }
.app-arch-body p  { font-size: 0.95rem; margin-bottom: var(--space-4); }

/* Timeline process */
.timeline-process {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 860px;
}
.timeline-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-6);
}
.timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.timeline-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 800;
  flex-shrink: 0;
  letter-spacing: -0.01em;
  border: 1.5px solid rgba(217,111,50,0.25);
}
.timeline-line {
  flex: 1;
  width: 2px;
  background: var(--border);
  margin: 8px 0;
  min-height: 40px;
}
.timeline-content {
  padding-bottom: var(--space-8);
}
.timeline-content h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
  margin-top: 10px;
}
.timeline-content p { font-size: 1rem; max-width: 600px; }

/* Reference project cards */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}
.ref-card {
  background: var(--surface);
  border: 1px solid rgba(189,182,170,0.55);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.ref-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.ref-card-visual {
  height: 180px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 18px;
}
.ref-visual--1 { background: url('../images/project-1.jpg') center/cover no-repeat; }
.ref-visual--2 { background: url('../images/project-2.jpg') center/cover no-repeat; }
.ref-visual--3 { background: url('../images/project-3.jpg') center/cover no-repeat; }
.ref-category {
  display: inline-block;
  padding: 5px 12px;
  background: rgba(217,111,50,0.85);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 999px;
}
.ref-card-body { padding: 24px; }
.ref-card-body h4 { font-size: 1.05rem; margin-bottom: var(--space-2); }
.ref-card-body p  { font-size: 0.9rem; margin-bottom: var(--space-3); }
.ref-location {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-soft);
  letter-spacing: 0.05em;
}
.ref-disclaimer {
  font-size: 0.82rem;
  color: var(--text-soft);
  font-style: italic;
  margin-top: var(--space-2);
}

/* ===========================
   Responsive — new components
   =========================== */
@media (max-width: 1200px) {
  .system-split { grid-template-columns: 1fr; }
  .tech-proof-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .problem-item { grid-template-columns: 72px 1fr; gap: var(--space-5); padding: var(--space-6); }
  .problem-num  { font-size: 2.5rem; }
  .applications-arch-grid,
  .ref-grid { grid-template-columns: 1fr; }
  .tech-proof-grid { grid-template-columns: 1fr; }
  .hero-diagram { min-height: 300px; padding: var(--space-5); }
}
@media (max-width: 640px) {
  .problem-item { grid-template-columns: 1fr; gap: var(--space-3); }
  .problem-num  { font-size: 2rem; }
  .timeline-step { grid-template-columns: 56px 1fr; }
  .tech-proof-section { padding: var(--space-9) 0; }
  .tech-proof-cta { padding: 24px; }
}