/* ==========================================================================
   TGA INGE GmbH - Modern Building Services Engineering Website Stylesheet
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-dark: #080C14;
  --bg-dark-card: #0F172A;
  --bg-dark-elevated: #1E293B;
  --bg-light: #F8FAFC;
  --bg-light-surface: #FFFFFF;
  --bg-light-alt: #F1F5F9;

  --text-dark-main: #0F172A;
  --text-dark-muted: #64748B;
  --text-light-main: #F8FAFC;
  --text-light-muted: #94A3B8;

  --accent-blue: #0284C7;
  --accent-cyan: #0EA5E9;
  --accent-teal: #06B6D4;
  --accent-green: #10B981;
  --accent-amber: #F59E0B;
  --accent-rose: #F43F5E;

  --border-light: #E2E8F0;
  --border-dark: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(14, 165, 233, 0.3);

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 25px rgba(14, 165, 233, 0.25);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-light);
  color: var(--text-dark-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

/* Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.text-gradient {
  background: linear-gradient(135deg, #0284C7 0%, #0EA5E9 50%, #38BDF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-green {
  background: linear-gradient(135deg, #059669 0%, #10B981 50%, #34D399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent-blue);
  border: 1px solid rgba(14, 165, 233, 0.2);
  margin-bottom: 1rem;
}

.section-tag.dark {
  background: rgba(14, 165, 233, 0.15);
  color: #38BDF8;
  border-color: rgba(56, 189, 248, 0.3);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem auto;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-dark-main);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-dark-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.6rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #0284C7 0%, #0369A1 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369A1 0%, #075985 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text-dark-main);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  background: var(--bg-light-alt);
  border-color: #CBD5E1;
  transform: translateY(-2px);
}

.btn-outline-white {
  background: rgba(255, 255, 255, 0.06);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: #334155;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.4rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-blue);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-blue);
  transition: width var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.lang-switch {
  display: flex;
  align-items: center;
  background: #F1F5F9;
  border-radius: 6px;
  padding: 3px;
  border: 1px solid #E2E8F0;
}

.lang-btn {
  background: transparent;
  border: none;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 4px;
  color: #64748B;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background: #FFFFFF;
  color: var(--accent-blue);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.nav-phone {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #0F172A;
}

.nav-phone svg {
  color: var(--accent-blue);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  min-height: 680px;
  padding-top: 130px;
  padding-bottom: 70px;
  background: radial-gradient(circle at 75% 20%, rgba(14, 165, 233, 0.12) 0%, rgba(8, 12, 20, 0) 60%),
              radial-gradient(circle at 15% 80%, rgba(16, 185, 129, 0.08) 0%, rgba(8, 12, 20, 0) 50%),
              var(--bg-dark);
  color: var(--text-light-main);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  opacity: 0.7;
}

.hero-glow-orb {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}

.hero-glow-1 {
  top: -100px;
  right: -50px;
  background: rgba(2, 132, 199, 0.25);
}

.hero-glow-2 {
  bottom: 0;
  left: 10%;
  background: rgba(16, 185, 129, 0.15);
}

.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-badge-row {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #38BDF8;
}

.hero-pill-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 8px #10B981;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.4rem;
}

.hero-title span {
  display: block;
}

.hero-lead {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--text-light-muted);
  margin-bottom: 2rem;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-features-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: #CBD5E1;
}

.hero-feature-item svg {
  color: #38BDF8;
  flex-shrink: 0;
}

/* Hero Right Executive Dashboard Card */
.hero-executive-card {
  position: relative;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 20px;
  padding: 2.2rem;
  box-shadow: var(--shadow-xl), 0 0 30px rgba(2, 132, 199, 0.15);
  backdrop-filter: blur(20px);
}

.hero-executive-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 1.5rem;
}

.hero-executive-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: #38BDF8;
  background: rgba(56, 189, 248, 0.12);
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
}

.hero-status-tag {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #10B981;
}

.hero-executive-body {
  display: flex;
  flex-direction: column;
}

.hero-kpi-grid-2x2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.hero-kpi-tile {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 1.1rem;
  transition: all var(--transition-fast);
}

.hero-kpi-tile:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(56, 189, 248, 0.3);
}

.hero-kpi-tile-num {
  font-size: 1.5rem;
  font-weight: 850;
  color: #FFFFFF;
  margin-bottom: 0.2rem;
  font-family: var(--font-mono);
}

.hero-kpi-tile-lbl {
  font-size: 0.75rem;
  color: #94A3B8;
  line-height: 1.3;
}

.hero-card-action-box {
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 12px;
  padding: 1.2rem;
}

/* Trust Bar */
.trust-bar {
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-light);
  padding: 1.8rem 0;
}

.trust-bar-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.trust-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #64748B;
}

.trust-logos {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.trust-logos img {
  height: 38px;
  width: auto;
  opacity: 0.85;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.trust-logos img:hover {
  opacity: 1;
  transform: translateY(-2px);
}

/* ==========================================================================
   Pain Points vs. TGA Inge Solution (Why Us)
   ========================================================================== */
.problems-section {
  padding: 6.5rem 0;
  background-color: var(--bg-light);
}

.problems-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: stretch;
}

.problems-card-legacy {
  background: #FFF1F2;
  border: 1px solid #FECDD3;
  border-radius: 16px;
  padding: 2.5rem;
  position: relative;
}

.problems-card-solution {
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  border-radius: 16px;
  padding: 2.5rem;
  position: relative;
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.08);
}

.problems-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.problems-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-danger {
  background: #FFE4E6;
  color: #E11D48;
}

.icon-success {
  background: #DCFCE7;
  color: #059669;
}

.problems-card-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: #0F172A;
}

.problems-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.problems-list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  font-size: 0.98rem;
  line-height: 1.5;
}

.problems-list-item svg {
  flex-shrink: 0;
  margin-top: 3px;
}

.problems-list-item.bad svg {
  color: #E11D48;
}

.problems-list-item.good svg {
  color: #059669;
}

/* ==========================================================================
   Interactive 3D BIM Viewer Simulation
   ========================================================================== */
.bim-viewer-section {
  padding: 6.5rem 0;
  background: var(--bg-dark);
  color: var(--text-light-main);
  position: relative;
}

.bim-viewer-card {
  background: #0B1320;
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 30px rgba(2, 132, 199, 0.15);
}

.bim-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: #0F172A;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
  gap: 1rem;
}

.bim-toolbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.bim-file-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #38BDF8;
}

.bim-badge-clash {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid #10B981;
  color: #10B981;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
}

.bim-toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bim-view-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #94A3B8;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.bim-view-btn.active, .bim-view-btn:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
}

.bim-workspace {
  display: grid;
  grid-template-columns: 290px 1fr;
  min-height: 480px;
}

.bim-layers-sidebar {
  background: #090E17;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem;
}

.bim-layers-title {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #94A3B8;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bim-layer-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.bim-layer-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}

.bim-layer-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.86rem;
  color: #E2E8F0;
}

.layer-color-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

.bim-layer-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid #64748B;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  background: transparent;
  transition: all var(--transition-fast);
}

.bim-layer-checkbox:checked {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.bim-layer-checkbox:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #000;
  font-size: 11px;
  font-weight: 900;
}

.bim-canvas-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, #101B2E 0%, #060B12 100%);
  overflow: hidden;
  min-height: 480px;
}

#bimSvgViewport {
  width: 100%;
  height: 100%;
  max-height: 520px;
  transition: transform var(--transition-normal);
}

.bim-canvas-hud {
  position: absolute;
  bottom: 1.2rem;
  right: 1.2rem;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  backdrop-filter: blur(10px);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #94A3B8;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.hud-stat {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.hud-stat span {
  color: #38BDF8;
  font-weight: 700;
}

/* ==========================================================================
   Services & Trades (Leistungen - KG 400 & HOAI LP 1-9)
   ========================================================================== */
.services-section {
  padding: 6.5rem 0;
  background: var(--bg-light-alt);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3.5rem;
}

.service-card {
  background: var(--bg-light-surface);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 2.2rem 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  transition: background var(--transition-fast);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(2, 132, 199, 0.3);
}

.service-card:hover::before {
  background: linear-gradient(90deg, #0284C7, #0EA5E9);
}

.service-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.service-card-title {
  font-size: 1.3rem;
  font-weight: 750;
  color: var(--text-dark-main);
  margin-bottom: 0.8rem;
}

.service-card-desc {
  font-size: 0.95rem;
  color: var(--text-dark-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.service-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.service-tag-item {
  font-size: 0.75rem;
  background: #F1F5F9;
  color: #475569;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-weight: 600;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-blue);
  transition: gap var(--transition-fast);
}

.service-link:hover {
  gap: 0.7rem;
}

/* HOAI Process Bar */
.hoai-overview-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.hoai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.hoai-steps-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.2rem;
}

.hoai-step-box {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 10px;
  padding: 1.2rem;
  position: relative;
  transition: all var(--transition-fast);
}

.hoai-step-box:hover {
  border-color: var(--accent-blue);
  background: #F0F9FF;
  transform: translateY(-3px);
}

.hoai-phase-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 0.4rem;
}

.hoai-step-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #0F172A;
  margin-bottom: 0.4rem;
}

.hoai-step-desc {
  font-size: 0.8rem;
  color: #64748B;
  line-height: 1.4;
}

/* ==========================================================================
   Interactive TGA Project Configurator & Calculator
   ========================================================================== */
.configurator-section {
  padding: 6.5rem 0;
  background: #FFFFFF;
}

.configurator-card {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  overflow: hidden;
}

.config-form-col {
  padding: 3rem;
}

.config-step {
  margin-bottom: 2.2rem;
}

.config-step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0F172A;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #FFFFFF;
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.building-type-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.type-pill {
  border: 1px solid #CBD5E1;
  background: #FFFFFF;
  padding: 0.8rem 0.6rem;
  border-radius: 10px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.type-pill.active, .type-pill:hover {
  border-color: var(--accent-blue);
  background: #F0F9FF;
  color: var(--accent-blue);
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.15);
}

.type-pill-icon {
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
}

.type-pill-label {
  font-size: 0.82rem;
  font-weight: 600;
}

/* Range Slider */
.slider-container {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  padding: 1.2rem;
}

.slider-val-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}

.slider-val-display {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

.config-slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #E2E8F0;
  outline: none;
  -webkit-appearance: none;
}

.config-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-blue);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.5);
  border: 2px solid #FFFFFF;
}

/* Disciplines Grid */
.disciplines-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
}

.disc-checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: #FFFFFF;
  border: 1px solid #CBD5E1;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
  transition: all var(--transition-fast);
}

.disc-checkbox-label:hover, .disc-checkbox-label.checked {
  border-color: var(--accent-blue);
  background: #F0F9FF;
  color: var(--accent-blue);
}

/* Config Summary Right Col */
.config-summary-col {
  background: #0F172A;
  color: #FFFFFF;
  padding: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.summary-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: #FFFFFF;
}

.summary-items-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.92rem;
}

.summary-row-label {
  color: #94A3B8;
}

.summary-row-val {
  font-weight: 700;
  color: #38BDF8;
  font-family: var(--font-mono);
}

.summary-banner {
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 1rem;
  border-radius: 8px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: #CBD5E1;
  margin-bottom: 1.8rem;
}

/* ==========================================================================
   Projects / Portfolio Showcase
   ========================================================================== */
.projects-section {
  padding: 6.5rem 0;
  background: var(--bg-light);
}

.projects-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  color: #475569;
  padding: 0.55rem 1.2rem;
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn.active, .filter-btn:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
  border-color: var(--accent-blue);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.project-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(2, 132, 199, 0.3);
}

.project-img-wrap {
  position: relative;
  height: 230px;
  overflow: hidden;
  background: #0F172A;
}

.project-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.project-card:hover .project-img-wrap img {
  transform: scale(1.05);
}

.project-badge-float {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  backdrop-filter: blur(8px);
}

.project-info {
  padding: 1.6rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-meta-row {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 750;
  color: #0F172A;
  margin-bottom: 0.6rem;
  line-height: 1.35;
}

.project-desc {
  font-size: 0.9rem;
  color: #64748B;
  line-height: 1.5;
  margin-bottom: 1.2rem;
  flex-grow: 1;
}

.project-specs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  border-top: 1px solid #F1F5F9;
  padding-top: 1rem;
}

.project-spec-chip {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  color: #334155;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
}

/* ==========================================================================
   Methodology / Step Process (In 4 Schritten zum Erfolg)
   ========================================================================== */
.process-section {
  padding: 6.5rem 0;
  background: var(--bg-dark);
  color: #FFFFFF;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.8rem;
  position: relative;
}

.process-card {
  background: #0F172A;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 2rem 1.6rem;
  position: relative;
  transition: all var(--transition-normal);
}

.process-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-4px);
  background: #131E33;
}

.process-num-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284C7 0%, #0EA5E9 100%);
  color: #FFFFFF;
  font-size: 1.1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.4rem;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
}

.process-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.8rem;
}

.process-card-text {
  font-size: 0.88rem;
  color: #94A3B8;
  line-height: 1.55;
}

/* ==========================================================================
   Testimonials & Quotes
   ========================================================================== */
.testimonials-section {
  padding: 6.5rem 0;
  background: #FFFFFF;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.testimonial-card {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 16px;
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 1rem;
  line-height: 1.6;
  color: #334155;
  margin-bottom: 1.5rem;
  font-style: italic;
  position: relative;
}

.testimonial-author-row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  border-top: 1px solid #E2E8F0;
  padding-top: 1.2rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #E2E8F0;
  color: var(--accent-blue);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #0F172A;
}

.author-title {
  font-size: 0.8rem;
  color: #64748B;
}

/* ==========================================================================
   FAQ Section (Accordion)
   ========================================================================== */
.faq-section {
  padding: 6.5rem 0;
  background: var(--bg-light-alt);
}

.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(2, 132, 199, 0.4);
  box-shadow: var(--shadow-sm);
}

.faq-question-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.3rem 1.6rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: #0F172A;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
  color: var(--accent-blue);
  flex-shrink: 0;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 1.6rem;
  color: #475569;
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 1.4rem;
}

/* ==========================================================================
   Contact Section & Consultation Form
   ========================================================================== */
.contact-section {
  padding: 6.5rem 0;
  background: #FFFFFF;
  position: relative;
}

.contact-card-wrapper {
  background: #0F172A;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  color: #FFFFFF;
}

.contact-info-col {
  padding: 3.5rem;
  background: radial-gradient(circle at 10% 20%, rgba(2, 132, 199, 0.25) 0%, rgba(15, 23, 42, 0) 70%),
              #0B1324;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.contact-info-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.2rem;
}

.contact-info-lead {
  font-size: 1.05rem;
  color: #94A3B8;
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  margin-bottom: 2.5rem;
}

.contact-channel-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.channel-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.12);
  color: #38BDF8;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.channel-detail-lbl {
  font-size: 0.75rem;
  color: #64748B;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.channel-detail-val {
  font-size: 1rem;
  font-weight: 700;
  color: #F8FAFC;
}

.contact-form-col {
  padding: 3.5rem;
  background: #0F172A;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #CBD5E1;
}

.form-input, .form-select, .form-textarea {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  color: #FFFFFF;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: #38BDF8;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.form-select option {
  background: #0F172A;
  color: #FFFFFF;
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: #06090F;
  color: #94A3B8;
  padding-top: 5rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand-col img {
  height: 44px;
  width: auto;
  margin-bottom: 1.2rem;
}

.footer-brand-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  color: #64748B;
  margin-bottom: 1.5rem;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 750;
  color: #F8FAFC;
  margin-bottom: 1.2rem;
  letter-spacing: 0.02em;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.footer-link {
  font-size: 0.88rem;
  color: #94A3B8;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: #38BDF8;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 2rem;
  font-size: 0.82rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-legal-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-legal-link {
  color: #64748B;
  transition: color var(--transition-fast);
}

.footer-legal-link:hover {
  color: #CBD5E1;
}

/* ==========================================================================
   Modals & Popups
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: 1.5rem;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: #FFFFFF;
  border-radius: 16px;
  max-width: 650px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  transform: translateY(20px);
  transition: transform var(--transition-smooth);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  background: #F1F5F9;
  border: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #64748B;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: #E2E8F0;
  color: #0F172A;
}

/* Toast Notification */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #0F172A;
  color: #FFFFFF;
  border-left: 4px solid var(--accent-green);
  padding: 1rem 1.4rem;
  border-radius: 8px;
  box-shadow: var(--shadow-xl);
  z-index: 3000;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-smooth);
  pointer-events: none;
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 1024px) {
  .hero {
    max-height: none;
    min-height: auto;
    padding-top: 110px;
    padding-bottom: 60px;
  }
  .hero-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .problems-grid {
    grid-template-columns: 1fr;
  }
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hoai-steps-row {
    grid-template-columns: repeat(3, 1fr);
  }
  .configurator-card {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .contact-card-wrapper {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .navbar-container {
    height: 68px;
  }
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    padding: 2rem;
    gap: 1.2rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    display: none;
  }
  .nav-menu.mobile-open {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.35rem;
  }
  .hero-features-list {
    grid-template-columns: 1fr;
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .hoai-steps-row {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .process-grid {
    grid-template-columns: 1fr;
  }
  .building-type-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .disciplines-grid {
    grid-template-columns: 1fr;
  }
  .form-group-row {
    grid-template-columns: 1fr;
  }
  .bim-workspace {
    grid-template-columns: 1fr;
  }
  .bim-layers-sidebar {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .contact-info-col, .contact-form-col {
    padding: 2rem 1.5rem;
  }
}