/* ==========================================================================
   RVA ENERGIETECHNIK - DESIGN SYSTEM & CORE STYLES (FUTURISTIC LIGHT THEME)
   Inspiration: Ampd Energy, Greener Power Solutions, RVA Corporate Identity
   ========================================================================== */

:root {
  /* Brand Color Palette */
  --color-primary: #F2B705;          /* RVA Signature Industrial Yellow */
  --color-primary-hover: #D99E00;
  --color-primary-light: rgba(242, 183, 5, 0.12);
  --color-primary-glow: rgba(242, 183, 5, 0.35);

  --color-secondary: #00A8E8;        /* Cyber Electric Cyan */
  --color-secondary-light: rgba(0, 168, 232, 0.1);

  /* Light Futuristic Backgrounds */
  --color-bg-light: #FFFFFF;         /* Crisp White Main Background */
  --color-bg-subtle: #F8FAFC;        /* Soft Off-White / Ice Background */
  --color-surface-white: #FFFFFF;    /* White Card Surface */
  --color-surface-hover: #F1F5F9;

  /* Contrast Dark Surfaces (for Footers & Tech Highlights) */
  --color-dark-bg: #0B1320;          /* Deep Tech Slate */
  --color-dark-surface: #131E2F;
  --color-dark-border: #23344E;

  /* Borders & Dividers */
  --color-border-light: #E2E8F0;
  --color-border-accent: rgba(242, 183, 5, 0.4);

  /* High Contrast Typography */
  --color-text-main: #0F172A;        /* Deep Slate / Charcoal */
  --color-text-muted: #475569;       /* Muted Body Text */
  --color-text-light: #F8FAFC;       /* Light text on dark elements */
  --color-text-muted-light: #94A3B8; /* Muted body text on dark surfaces */

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;

  /* Typography — matches the Arial/Helvetica wordmark used in the logo */
  --font-heading: Arial, 'Helvetica Neue', Helvetica, sans-serif;
  --font-body: Arial, 'Helvetica Neue', Helvetica, sans-serif;

  /* Dimensions & Radius */
  --container-width: 1280px;
  --header-height: 118px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transitions & Shadows */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --shadow-subtle: 0 4px 20px rgba(15, 23, 42, 0.05);
  --shadow-card: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-yellow: 0 8px 25px rgba(242, 183, 5, 0.3);
  --shadow-glow: 0 0 20px rgba(242, 183, 5, 0.2);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-main);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Top Utility Bar (Futuristic Dark Accent Header) */
.top-bar {
  background-color: var(--color-dark-bg);
  border-bottom: 1px solid var(--color-dark-border);
  font-size: 0.85rem;
  color: #94A3B8;
  padding: 0.45rem 0;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.top-bar-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.meta-item svg {
  width: 14px;
  height: 14px;
  color: var(--color-primary);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,0.08);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.12);
}

.lang-btn {
  background: none;
  border: none;
  color: #94A3B8;
  font-weight: 700;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 4px;
  transition: var(--transition-fast);
}

.lang-btn.active, .lang-btn:hover {
  background: var(--color-primary);
  color: var(--color-dark-bg);
}

/* Main Navigation Header (Clean White Glassmorphism) */
.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-normal);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-logo {
  display: block;
  height: 98px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-text-main);
}

.nav-link.active::after, .nav-link:hover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.dropdown-parent {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 280px;
  background: #FFFFFF;
  border: 1px solid var(--color-border-light);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 0.5rem;
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition-fast);
}

.dropdown-parent:hover .dropdown-menu {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--color-bg-subtle);
}

.dropdown-item-title {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--color-text-main);
  font-size: 0.9rem;
}

.dropdown-item-sub {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-main);
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-toggle .icon-close {
  display: none;
}

.mobile-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.mobile-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #FFFFFF;
  border-top: 1px solid var(--color-border-light);
  padding: 2rem 1.5rem;
  z-index: 999;
  overflow-y: auto;
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-main);
  display: block;
}

.mobile-nav-link.sub {
  font-size: 1rem;
  color: var(--color-primary-hover);
  padding-left: 1rem;
}

/* Page Sub-Navigation (Sprungmarken-Menü) */
.page-subnav {
  position: sticky;
  top: var(--header-height);
  z-index: 900;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
}

.page-subnav-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  overflow-x: auto;
  padding: 0.9rem 0;
  scrollbar-width: none;
}

.page-subnav-inner::-webkit-scrollbar {
  display: none;
}

.page-subnav-link {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.3px;
  color: var(--color-text-muted);
  white-space: nowrap;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: var(--transition-normal);
}

.page-subnav-link:hover,
.page-subnav-link.active {
  color: var(--color-text-main);
  border-bottom-color: var(--color-primary);
}

.anchor-target {
  scroll-margin-top: calc(var(--header-height) + 56px);
}


/* Buttons & CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.95rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-dark-bg);
  box-shadow: var(--shadow-yellow);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(242, 183, 5, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-main);
  border: 2px solid var(--color-text-main);
}

.btn-outline:hover {
  background: var(--color-text-main);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-dark-bg);
  color: #FFFFFF;
  border: 1px solid var(--color-dark-border);
}

.btn-secondary:hover {
  background: #192537;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1.1rem 2.25rem;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* Badges (Futuristic Pills) */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 30px;
  font-size: 0.78rem;
  font-family: var(--font-heading);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.badge-yellow {
  background: rgba(242, 183, 5, 0.15);
  color: #B38200;
  border: 1px solid rgba(242, 183, 5, 0.4);
}

.badge-blue {
  background: rgba(0, 168, 232, 0.12);
  color: #0077B6;
  border: 1px solid rgba(0, 168, 232, 0.3);
}

.badge-dark {
  background: var(--color-dark-bg);
  color: #FFFFFF;
  border: 1px solid var(--color-dark-border);
}

/* Section Layout & Spacing */
.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-light {
  background-color: var(--color-bg-light);
}

.section-subtle {
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.section-dark-accent {
  background-color: var(--color-dark-bg);
  color: #FFFFFF;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem auto;
}

.section-subtitle {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--color-primary-hover);
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-size: 2.35rem;
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
}

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

/* Futuristic Card Components */
.futuristic-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.futuristic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-primary);
}

.futuristic-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
  border-color: rgba(242, 183, 5, 0.6);
}

/* Blue accent variant for cards outside the dedicated HPC theme (e.g. homepage HPC card) */
.futuristic-card.card-accent-blue {
  border-top-color: var(--color-secondary);
}

.futuristic-card.card-accent-blue::before {
  background: var(--color-secondary);
}

.futuristic-card.card-accent-blue:hover {
  border-color: rgba(0, 168, 232, 0.6);
}

/* Crane Feature Highlight Box (Ampd / Greener Inspired) */
.crane-feature-box {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 3rem;
  border: 1px solid var(--color-dark-border);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.crane-feature-box::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(242,183,5,0.15) 0%, transparent 70%);
  pointer-events: none;
}

/* Inter-Section Repeated CTA Banner */
.cta-banner {
  background: #FFFFFF;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 2.5rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin: 3.5rem 0;
  box-shadow: 0 12px 30px rgba(242, 183, 5, 0.15);
}

.cta-banner-content h3 {
  font-size: 1.4rem;
  color: var(--color-text-main);
  margin-bottom: 0.4rem;
}

.cta-banner-content p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Economic Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.metric-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 2.25rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
}

.metric-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  color: #D99E00;
  line-height: 1;
  margin-bottom: 0.5rem;
}

/* Blue theme variant (HPC Cube page) */
body.theme-hpc .metric-card:hover {
  border-color: var(--color-secondary);
}

body.theme-hpc .metric-value {
  color: var(--color-secondary);
}

body.theme-hpc .futuristic-card::before {
  background: var(--color-secondary);
}

body.theme-hpc .futuristic-card:hover {
  border-color: rgba(0, 168, 232, 0.6);
}

body.theme-hpc .section-subtitle {
  color: var(--color-secondary);
}

body.theme-hpc .page-subnav-link:hover,
body.theme-hpc .page-subnav-link.active {
  border-bottom-color: var(--color-secondary);
}

.metric-label {
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-text-main);
  margin-bottom: 0.4rem;
}

.metric-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Specification Tables */
.spec-table-container {
  overflow-x: auto;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-card);
  margin: 2rem 0;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.spec-table th, .spec-table td {
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.spec-table th {
  background: var(--color-dark-bg);
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--color-primary);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.spec-table td:first-child {
  font-weight: 700;
  color: var(--color-text-main);
  width: 36%;
}

.spec-table td:last-child {
  color: var(--color-text-muted);
}

.spec-table tr:hover {
  background: var(--color-bg-subtle);
}

/* Form Styles */
.form-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border-light);
  border-top: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group.full {
  grid-column: span 2;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.form-label span {
  color: var(--color-primary-hover);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  color: var(--color-text-main);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  background: #FFFFFF;
  border-color: var(--color-primary-hover);
  box-shadow: 0 0 0 3px rgba(242, 183, 5, 0.2);
}

.form-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  cursor: pointer;
}

.form-checkbox-label input {
  margin-top: 3px;
  accent-color: var(--color-primary);
}

/* Structured Case Study Box (Light/Dark Glass Hybrid) */
.case-study-placeholder {
  background: #FFFFFF;
  border: 2px dashed var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  position: relative;
  box-shadow: var(--shadow-subtle);
}

.case-study-tag {
  display: inline-block;
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-family: monospace;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
}

/* Footer (Deep Tech Navy Footer for Solid Grounding) */
.main-footer {
  background-color: var(--color-dark-bg);
  border-top: 1px solid var(--color-dark-border);
  padding: 4rem 0 2rem 0;
  color: #94A3B8;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 1rem;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.footer-contact-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
  max-width: 500px;
  background: var(--color-dark-bg);
  color: #FFFFFF;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cookie-banner.hidden {
  display: none;
}

.cookie-banner p {
  font-size: 0.85rem;
  color: #94A3B8;
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* Responsive Rules */
@media (max-width: 992px) {
  .nav-menu {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

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

  .cta-banner {
    flex-direction: column;
    text-align: center;
  }

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

  .form-group.full {
    grid-column: span 1;
  }

  :root {
    --header-height: 84px;
  }

  .site-logo {
    height: 52px;
  }

  .header-inner > .btn {
    display: none;
  }
}

/* Collapse any two/three-column inline grid layout to a single column on
   tablets and phones. Sections across the site define their grids via
   inline style="grid-template-columns: ..." rather than a shared class,
   so this catch-all keeps every one of them stacking correctly on mobile. */
@media (max-width: 860px) {
  [style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .top-bar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-title {
    font-size: 1.8rem !important;
  }

  h1 {
    font-size: 2rem !important;
  }

  .page-subnav-inner {
    justify-content: flex-start;
  }

  /* Any row of 2+ buttons (hero CTAs, card actions, etc.) stacks full-width
     instead of squeezing side by side. Scoped to rows with multiple direct
     .btn children so single buttons and badge rows are left alone. */
  [style*="display: flex"]:has(> .btn ~ .btn) {
    flex-direction: column !important;
    align-items: stretch !important;
  }

  [style*="display: flex"]:has(> .btn ~ .btn) > .btn {
    width: 100%;
    text-align: center;
    justify-content: center;
  }
}

/* Mobile Nav Drawer: primary CTA pinned below the page links */
.mobile-nav-cta-item {
  margin-top: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-light);
}

.mobile-nav-cta-item .btn {
  width: 100%;
  justify-content: center;
}