/* ============================================
   TheSign Systems — Design System
   Premium Dark Futuristic Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Custom Properties --- */
:root {
  /* Colors — Deep Navy Cinematic Theme */
  --bg-primary: #050b1a;
  --bg-secondary: #0a1628;
  --bg-tertiary: #0f1d35;
  --bg-card: rgba(10, 22, 40, 0.7);
  --bg-card-hover: rgba(15, 30, 55, 0.85);
  --bg-glass: rgba(8, 16, 30, 0.8);

  --accent: #00e5ff;
  --accent-dim: rgba(0, 229, 255, 0.12);
  --accent-glow: rgba(0, 229, 255, 0.3);
  --accent-secondary: #4060ff;
  --accent-secondary-dim: rgba(64, 96, 255, 0.15);
  --accent-gradient: linear-gradient(135deg, #00e5ff, #4060ff);
  --accent-gradient-subtle: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(64, 96, 255, 0.08));

  --text-primary: #e8ecf2;
  --text-secondary: #8898b0;
  --text-tertiary: #5a6a82;
  --text-accent: #00e5ff;

  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 229, 255, 0.2);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.25rem;
  --text-6xl: 4rem;
  --text-7xl: 5rem;

  /* Spacing */
  --section-padding: 120px 0;
  --container-max: 1200px;
  --container-padding: 0 24px;

  /* Misc */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  font-size: var(--text-base);
}

::selection {
  background: rgba(0, 229, 255, 0.25);
  color: #fff;
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

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

a:hover {
  color: #fff;
}

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

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--container-padding);
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--container-padding);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(5, 11, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: var(--text-lg);
  color: #fff;
  letter-spacing: -0.02em;
}

.nav-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-gradient);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--text-sm);
  color: #0a0a0f;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: var(--transition);
}

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

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

.nav-links a.active {
  color: var(--text-accent);
}

.nav-cta {
  padding: 8px 20px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  color: var(--text-accent) !important;
  font-size: var(--text-sm) !important;
  font-weight: 500 !important;
  transition: var(--transition);
}

.nav-cta:hover {
  background: rgba(0, 229, 255, 0.25) !important;
  color: #fff !important;
}

.nav-cta::after {
  display: none !important;
}

/* Mobile Nav */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 140px 24px 100px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg canvas {
  width: 100%;
  height: 100%;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(0, 229, 255, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 60%),
    linear-gradient(180deg, transparent 60%, var(--bg-primary) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 32px;
}

.hero-tag .dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(1.5);
  }
}

.hero h1 {
  font-size: var(--text-6xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #ffffff 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .accent-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #0a0a0f;
}

.btn-primary:hover {
  background: #33ebff;
  color: #0a0a0f;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--text-tertiary);
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-accent);
  padding: 14px 0;
}

.btn-ghost:hover {
  color: #fff;
}

.btn-ghost .arrow {
  transition: var(--transition);
}

.btn-ghost:hover .arrow {
  transform: translateX(4px);
}

/* ============================================
   SECTIONS
   ============================================ */
section {
  padding: var(--section-padding);
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: 100px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.15;
}

.section-header p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Left-aligned section header */
.section-header-left {
  text-align: left;
  margin-bottom: 48px;
}

.section-header-left h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-header-left p {
  color: var(--text-secondary);
  font-size: var(--text-base);
  max-width: 560px;
}

/* Section dividers */
.section-divider {
  height: 1px;
  background: var(--border);
  margin: 0;
  border: none;
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-accent), transparent);
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: var(--text-xl);
  color: var(--accent);
}

.card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ============================================
   GRID LAYOUTS
   ============================================ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ============================================
   STATS ROW
   ============================================ */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 64px;
  flex-wrap: wrap;
  padding: 64px 0;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--text-accent);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  text-align: center;
  padding: 100px 0;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-accent), transparent);
}

.cta-section h2 {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--text-secondary);
  font-size: var(--text-lg);
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   PAGE HERO (inner pages)
   ============================================ */
.page-hero {
  padding: 180px 24px 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 229, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero h1 {
  font-size: var(--text-5xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  line-height: 1.1;
}

.page-hero p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================
   FEATURE ROWS
   ============================================ */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 80px 0;
}

.feature-row.reverse {
  direction: rtl;
}

.feature-row.reverse>* {
  direction: ltr;
}

.feature-visual {
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.feature-visual .visual-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 30px 30px;
}

.feature-visual .visual-glow {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

.feature-content h3 {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.feature-content p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.feature-list li .check {
  color: var(--accent);
  font-size: var(--text-base);
}

/* ============================================
   TIMELINE
   ============================================ */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--accent), var(--border) 80%, transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -44px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-item h4 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--border-accent);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.08);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-top: 16px;
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  color: var(--text-tertiary);
  font-size: var(--text-sm);
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--text-accent);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

/* ============================================
   ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 {
  transition-delay: 0.1s;
}

.fade-in-delay-2 {
  transition-delay: 0.2s;
}

.fade-in-delay-3 {
  transition-delay: 0.3s;
}

.fade-in-delay-4 {
  transition-delay: 0.4s;
}

/* Glow animation */
@keyframes glow-pulse {

  0%,
  100% {
    box-shadow: 0 0 20px rgba(0, 229, 255, 0.1);
  }

  50% {
    box-shadow: 0 0 40px rgba(0, 229, 255, 0.2);
  }
}

/* Grid line animation */
@keyframes grid-move {
  0% {
    transform: translateY(0);
  }

  100% {
    transform: translateY(30px);
  }
}

/* ============================================
   PRODUCT CATEGORIES
   ============================================ */
.product-category {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
}

.product-category:last-child {
  border-bottom: none;
}

.category-header {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 40px;
}

.category-number {
  font-size: var(--text-5xl);
  font-weight: 800;
  color: rgba(255, 255, 255, 0.04);
  line-height: 1;
  font-family: var(--font-mono);
}

.category-info h3 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: 8px;
}

.category-info p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* ============================================
   RESEARCH AREAS
   ============================================ */
.research-area {
  position: relative;
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.research-area:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.research-area .area-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-accent);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.research-area h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 12px;
}

.research-area p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ============================================
   BLOG CARDS
   ============================================ */
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.blog-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}

.blog-card-image {
  aspect-ratio: 16/9;
  background: var(--bg-tertiary);
  position: relative;
  overflow: hidden;
}

.blog-card-image .overlay-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 20px 20px;
}

.blog-card-body {
  padding: 24px;
}

.blog-card-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
}

.blog-card-meta span {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.blog-card-meta .tag {
  color: var(--text-accent);
}

.blog-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.3;
}

.blog-card p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ============================================
   TABS
   ============================================ */
.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
  justify-content: center;
}

.tab-btn {
  padding: 10px 20px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  border-color: var(--text-tertiary);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-dim);
  border-color: var(--border-accent);
  color: var(--text-accent);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --text-6xl: 3rem;
    --text-5xl: 2.5rem;
    --text-4xl: 2rem;
    --section-padding: 80px 0;
  }

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

  .feature-row {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .feature-row.reverse {
    direction: ltr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --text-6xl: 2.25rem;
    --text-5xl: 2rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
    --section-padding: 64px 0;
  }

  .hero {
    min-height: auto;
    padding: 140px 20px 80px;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    border-left: 1px solid var(--border);
    transition: var(--transition-slow);
    z-index: 999;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

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

  .grid-4 {
    grid-template-columns: 1fr;
  }

  .stats-row {
    gap: 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .page-hero {
    padding: 140px 20px 60px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  :root {
    --text-6xl: 1.875rem;
    --text-5xl: 1.625rem;
    --text-4xl: 1.5rem;
  }

  .container {
    padding: 0 16px;
  }

  .card {
    padding: 24px;
  }
}

/* ============================================
   LABS SPECIFIC
   ============================================ */
.labs-hero {
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.04) 0%, transparent 60%);
}

.lab-project {
  position: relative;
  padding: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  overflow: hidden;
}

.lab-project::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: var(--transition);
}

.lab-project:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.lab-project:hover::after {
  opacity: 1;
}

.lab-project .status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(0, 229, 255, 0.08);
  border-radius: 100px;
  font-size: var(--text-xs);
  color: var(--text-accent);
  font-weight: 500;
  margin-bottom: 16px;
}

.lab-project .status .status-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.lab-project h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 12px;
}

.lab-project p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ============================================
   SOLUTION CARDS
   ============================================ */
.solution-card {
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.solution-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
}

.solution-card .target {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-accent);
  margin-bottom: 16px;
  font-weight: 500;
}

.solution-card h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 12px;
}

.solution-card p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: 20px;
}

.solution-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.solution-card ul li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
}

.solution-card ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: var(--text-xs);
}

/* ============================================
   CAREERS
   ============================================ */
.value-card {
  text-align: center;
  padding: 40px 32px;
}

.value-card .value-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  background: var(--accent-dim);
  border-radius: var(--radius-md);
  font-size: var(--text-2xl);
}

.value-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 8px;
}

.open-role {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  margin-bottom: 8px;
}

.open-role:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.open-role h4 {
  font-size: var(--text-base);
  font-weight: 500;
}

.open-role .role-meta {
  display: flex;
  gap: 16px;
}

.open-role .role-meta span {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.contact-info-card h4 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 8px;
}

.contact-info-card p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   MOBILE OVERLAY
   ============================================ */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 998;
}

.nav-overlay.active {
  display: block;
}