/* YÖN ENERJİ — Corporate Design System & Stylesheet */
:root {
  /* Color Palette */
  --color-primary: #0a4d3c;       /* Deep Forest Emerald */
  --color-primary-light: #10b981; /* Fresh Energy Green */
  --color-primary-dark: #06372b;  /* Dark Spruce */
  
  --color-secondary: #0f172a;     /* Deep Slate Navy */
  --color-secondary-light: #1e293b;
  --color-secondary-muted: #475569;
  
  --color-accent: #f59e0b;        /* Solar Amber */
  --color-accent-hover: #d97706;
  --color-accent-subtle: #fef3c7;
  
  --color-bg: #ffffff;
  --color-bg-subtle: #f8fafc;
  --color-bg-muted: #f1f5f9;
  --color-bg-card: #ffffff;
  
  --color-border: #e2e8f0;
  --color-border-subtle: #cbd5e1;
  --color-border-strong: #94a3b8;
  
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-text-subtle: #64748b;
  --color-text-light: #ffffff;
  
  /* Typography Scale */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.825rem + 0.25vw, 0.9375rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.65rem + 1.1vw, 2.25rem);
  --text-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
  --text-5xl: clamp(2.75rem, 2.3rem + 2.2vw, 3.75rem);
  
  /* Layout Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  --max-w-container: 1280px;
  --max-w-prose: 72ch;
  
  /* Shadows & Elevation */
  --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 -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.2);
  
  /* Borders & Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility Skip Link */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 9999;
  transition: top var(--transition-fast);
}
.skip-to-content:focus {
  top: var(--space-4);
  outline: 3px solid var(--color-accent);
}

/* Focus Visible Styling (WCAG AA) */
:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 3px;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-w-container);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 3vw, 2rem);
  padding-right: clamp(1rem, 3vw, 2rem);
}

/* Header & Top Bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 99999;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-normal);
}

.top-bar {
  background-color: var(--color-secondary);
  color: #e2e8f0;
  font-size: var(--text-xs);
  padding: var(--space-2) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  z-index: 99999;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.top-bar-contact {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.top-bar-contact a {
  color: #e2e8f0;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: color var(--transition-fast);
}
.top-bar-contact a:hover {
  color: var(--color-accent);
}

.top-bar-partners {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.725rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #94a3b8;
}
.top-bar-partners span {
  color: var(--color-accent);
  font-weight: 600;
}

/* Main Navigation Bar */
.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
}

.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo-img {
  height: 42px;
  width: auto;
  max-width: 260px;
  object-fit: contain;
  display: block;
}

@media (max-width: 768px) {
  .site-logo-img {
    height: 36px;
    max-width: 200px;
  }
}

@media (max-width: 400px) {
  .site-logo-img {
    height: 30px;
    max-width: 170px;
  }
}

/* Nav Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-bg-muted);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  display: none;
  list-style: none;
  z-index: 1050;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  display: block;
}

.nav-dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.nav-dropdown-link:hover {
  background-color: var(--color-bg-muted);
  color: var(--color-primary);
  padding-left: var(--space-4);
}

/* Language Switcher */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  background-color: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 2px;
  margin-left: var(--space-4);
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-secondary-light);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

/* Mobile Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-text);
}

/* Hero Section */
.hero {
  position: relative;
  background: linear-gradient(135deg, #06372b 0%, #0a4d3c 50%, #0f172a 100%);
  color: #ffffff;
  padding: clamp(3rem, 7vw, 6rem) 0;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 80% 20%, rgba(245, 158, 11, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(16, 185, 129, 0.12) 0%, transparent 50%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background-color: rgba(245, 158, 11, 0.2);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fef3c7;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.hero-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.hero-title span {
  color: var(--color-accent);
}

.hero-desc {
  font-size: var(--text-lg);
  color: #cbd5e1;
  max-width: var(--max-w-prose);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.hero-visual {
  position: relative;
}

.hero-card-stack {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
}

.hero-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.hero-metric-box {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
}

.hero-metric-val {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: var(--space-1);
}

.hero-metric-label {
  font-size: var(--text-xs);
  color: #cbd5e1;
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}

.btn-primary {
  background-color: #065f46;
  color: #ffffff;
}
.btn-primary:hover {
  background-color: #044e39;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(6, 95, 70, 0.4);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #0f172a;
}
.btn-accent:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-outline-white {
  border-color: rgba(255, 255, 255, 0.3);
  color: #ffffff;
  background: transparent;
}
.btn-outline-white:hover {
  border-color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.btn-secondary {
  background-color: var(--color-bg-muted);
  color: var(--color-secondary);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background-color: #e2e8f0;
}

/* Sections */
.section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

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

.section-dark {
  background-color: var(--color-secondary);
  color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 65ch;
  margin: 0 auto clamp(2rem, 4vw, 3.5rem);
}

.section-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.section-dark .section-tag {
  color: var(--color-accent);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-3);
  color: var(--color-secondary);
}

.section-dark .section-title {
  color: #ffffff;
}

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

.section-dark .section-desc {
  color: #cbd5e1;
}

/* Cards & Grid */
.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-6);
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: var(--space-8);
}

.activity-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.activity-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.activity-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-bg-muted);
  border-bottom: 1px solid var(--color-border);
}

.activity-card-body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.activity-card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-secondary);
}

.activity-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  flex-grow: 1;
  line-height: 1.5;
}

.activity-card-link {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.activity-card-link:hover {
  color: var(--color-accent-hover);
}

/* Tabs for Projects */
.tabs-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--space-2);
}

.tab-btn {
  background: none;
  border: none;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-muted);
}

.tab-btn.active {
  color: #ffffff;
  background-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

/* Project Cards */
.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.project-card-header {
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.project-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: #e0f2fe;
  color: #0369a1;
}

.project-badge-ongoing {
  background: #fef3c7;
  color: #92400e;
}

.project-badge-founder {
  background: #ede9fe;
  color: #6d28d9;
}

.project-card-body {
  padding: var(--space-5);
  flex-grow: 1;
}

.project-card-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-secondary);
}

.project-meta-list {
  list-style: none;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.project-meta-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 4px;
}
.project-meta-item strong {
  color: var(--color-secondary);
}

/* Products EVC Grid */
.product-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-light);
}

.product-img-wrap {
  background: radial-gradient(circle, #f8fafc 0%, #e2e8f0 100%);
  padding: var(--space-6);
  text-align: center;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--color-border);
}

.product-img {
  max-height: 100%;
  max-width: 100%;
  object-fit: contain;
  filter: drop-shadow(0 10px 8px rgba(0, 0, 0, 0.1));
}

.product-body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-power {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 800;
  color: #92400e;
  background-color: #fef3c7;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  width: fit-content;
}

.product-title {
  font-size: var(--text-base);
  font-weight: 800;
  color: var(--color-secondary);
  margin-bottom: var(--space-2);
}

.product-model-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: #e2e8f0;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  color: #0f172a;
  font-weight: 600;
  display: inline-block;
  margin-bottom: var(--space-3);
  width: fit-content;
}

/* Technical Specification Table */
.spec-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  margin: var(--space-6) 0;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  text-align: left;
}

.spec-table th, .spec-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.spec-table th {
  background-color: var(--color-bg-muted);
  font-weight: 700;
  color: var(--color-secondary);
  white-space: nowrap;
}

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

/* Call to Action Box */
.cta-box {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary-dark) 100%);
  color: #ffffff;
  border-radius: var(--radius-2xl);
  padding: clamp(2.5rem, 5vw, 4rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box h2 {
  font-size: var(--text-3xl);
  font-weight: 800;
  margin-bottom: var(--space-3);
}

.cta-box p {
  color: #cbd5e1;
  max-width: 60ch;
  margin: 0 auto var(--space-6);
  font-size: var(--text-base);
}

/* Contact Page & Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
}

.contact-info-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--color-secondary);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--text-sm);
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
  outline: none;
}

/* Honeypot field (anti-spam) */
.form-hp {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  position: absolute !important;
  left: -9999px !important;
}

/* Footer */
.site-footer {
  background-color: #0b1120;
  color: #94a3b8;
  padding: clamp(3rem, 6vw, 4.5rem) 0 var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer-logo {
  height: 40px;
  width: auto;
  max-width: 250px;
  object-fit: contain;
  display: block;
  margin-bottom: var(--space-3);
  filter: brightness(1.1);
}

@media (max-width: 768px) {
  .footer-logo {
    height: 36px;
    width: auto;
    max-width: 220px;
  }
}

.footer-col h3,
.footer-col h4 {
  color: #ffffff;
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}
.footer-links a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
}

/* Responsive Navigation for Mobile */
body.menu-open {
  overflow: hidden;
}

@media (max-width: 991px) {
  .mobile-nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: 8px;
    background: var(--color-bg-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-secondary);
  }
  
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    max-width: 100%;
    height: calc(100vh - 64px);
    background-color: #ffffff !important;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--space-4) var(--space-16);
    gap: var(--space-2);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    display: none;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
    border-top: 1px solid var(--color-border);
    z-index: 1000000 !important;
  }
  
  .nav-menu.open {
    display: flex !important;
    z-index: 1000000 !important;
  }
  
  .nav-item {
    width: 100%;
  }

  .nav-link {
    font-size: 1.05rem;
    font-weight: 700;
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .nav-link:hover, .nav-link.active {
    background-color: var(--color-bg-muted);
    color: var(--color-primary);
  }
  
  .nav-dropdown {
    position: static;
    display: flex;
    flex-direction: column;
    gap: 4px;
    box-shadow: none;
    border: none;
    border-left: 3px solid var(--color-primary-light);
    margin: 4px 0 8px 12px;
    padding: 6px 0 6px 12px;
    background-color: #f8fafc;
    border-radius: var(--radius-sm);
  }

  .nav-dropdown-link {
    display: block;
    padding: 10px 14px;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-secondary);
    border-radius: var(--radius-md);
  }
}

/* Accessibility: Screen-reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}