/* ========================================
   Linkage SDK Landing Page - Styles
   Modern, világoskék, bizalmat sugárzó design
======================================== */

/* CSS Variables */
:root {
  /* Primary Colors - Világoskék paletta */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;

  /* Neutral Colors */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* Accent Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Typography */
  --font-family:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Spacing */
  --container-max: 1200px;
  --section-padding: 100px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg:
    0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl:
    0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-700);
  background-color: var(--gray-50);
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-header.light {
  color: white;
}

.section-header.light .section-badge {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

.section-header.light p {
  color: rgba(255, 255, 255, 0.8);
}

.section-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--primary-100);
  color: var(--primary-700);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-header h2 {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-header.light h2 {
  color: white;
}

.section-header p {
  font-size: 18px;
  color: var(--gray-500);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--primary-500) 0%,
    var(--primary-600) 100%
  );
  color: white;
  box-shadow: 0 4px 14px rgba(14, 165, 233, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.45);
}

.btn-secondary {
  background: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-300);
}

.btn-nav {
  padding: 10px 20px;
  font-size: 14px;
}

.btn-full {
  width: 100%;
}

/* ========================================
   Navigation
======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: all var(--transition-base);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
}

.logo-icon {
  width: 40px;
  height: auto;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-600);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--primary-600);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* Language Selector */
.lang-selector {
  position: relative;
  margin-left: 16px;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--primary-50);
  border: 1px solid var(--primary-200);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-700);
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  background: var(--primary-100);
  border-color: var(--primary-300);
}

.lang-btn svg {
  flex-shrink: 0;
}

.lang-btn .chevron {
  transition: transform var(--transition-fast);
}

.lang-selector.active .lang-btn .chevron {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 140px;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: 100;
  overflow: hidden;
}

.lang-selector.active .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 16px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--gray-700);
  transition: all var(--transition-fast);
  text-align: left;
}

.lang-option:hover {
  background: var(--primary-50);
  color: var(--primary-700);
}

.lang-option.active {
  background: var(--primary-100);
  color: var(--primary-700);
  font-weight: 600;
}

.lang-flag {
  font-size: 18px;
  line-height: 1;
}

/* ========================================
   Hero Section
======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    var(--primary-50) 0%,
    white 50%,
    var(--primary-100) 100%
  );
  z-index: -2;
}

.hero-bg::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse, var(--primary-100) 0%, transparent 70%);
  opacity: 0.6;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  max-width: 580px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: white;
  color: var(--primary-600);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
}

.hero h1 {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.1;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(
    135deg,
    var(--primary-500) 0%,
    var(--primary-700) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 40px;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-600);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--gray-500);
  font-weight: 500;
}

/* Hero Visual - Mesh Animation */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mesh-animation {
  position: relative;
  width: 340px;
  height: 380px;
}

.shield-mesh {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 10px 30px rgba(26, 58, 92, 0.15));
}

.shield-path {
  animation: shieldGlow 4s ease-in-out infinite;
}

@keyframes shieldGlow {
  0%,
  100% {
    filter: drop-shadow(0 0 8px rgba(26, 58, 92, 0.3));
  }
  50% {
    filter: drop-shadow(0 0 20px rgba(26, 58, 92, 0.5));
  }
}

.mesh-line {
  stroke-linecap: round;
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  animation: drawLine 2s ease forwards;
}

.mesh-line:nth-child(1) {
  animation-delay: 0.1s;
}
.mesh-line:nth-child(2) {
  animation-delay: 0.2s;
}
.mesh-line:nth-child(3) {
  animation-delay: 0.3s;
}
.mesh-line:nth-child(4) {
  animation-delay: 0.4s;
}
.mesh-line:nth-child(5) {
  animation-delay: 0.5s;
}
.mesh-line:nth-child(6) {
  animation-delay: 0.6s;
}
.mesh-line:nth-child(7) {
  animation-delay: 0.7s;
}
.mesh-line:nth-child(8) {
  animation-delay: 0.8s;
}
.mesh-line:nth-child(9) {
  animation-delay: 0.9s;
}
.mesh-line:nth-child(10) {
  animation-delay: 1s;
}
.mesh-line:nth-child(11) {
  animation-delay: 1.1s;
}
.mesh-line:nth-child(12) {
  animation-delay: 1.2s;
}

@keyframes drawLine {
  to {
    stroke-dashoffset: 0;
  }
}

.node-group {
  opacity: 0;
  animation: nodeAppear 0.5s ease forwards;
}

.node-group.node-1 {
  animation-delay: 0.3s;
}
.node-group.node-2 {
  animation-delay: 0.5s;
}
.node-group.node-3 {
  animation-delay: 0.7s;
}
.node-group.node-4 {
  animation-delay: 0.9s;
}
.node-group.node-5 {
  animation-delay: 1.1s;
}
.node-group.node-6 {
  animation-delay: 1.3s;
}
.node-group.node-7 {
  animation-delay: 1.5s;
}
.node-group.node-8 {
  animation-delay: 1.7s;
}
.node-group.node-9 {
  animation-delay: 1.9s;
}

@keyframes nodeAppear {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.node-group circle:first-child {
  animation: nodePulse 3s ease-in-out infinite;
}

.node-group.node-1 circle:first-child {
  animation-delay: 0s;
}
.node-group.node-2 circle:first-child {
  animation-delay: 0.4s;
}
.node-group.node-3 circle:first-child {
  animation-delay: 0.8s;
}
.node-group.node-4 circle:first-child {
  animation-delay: 1.2s;
}
.node-group.node-5 circle:first-child {
  animation-delay: 1.6s;
}
.node-group.node-6 circle:first-child {
  animation-delay: 2s;
}
.node-group.node-7 circle:first-child {
  animation-delay: 2.4s;
}
.node-group.node-8 circle:first-child {
  animation-delay: 2.8s;
}

@keyframes nodePulse {
  0%,
  100% {
    transform-origin: center;
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* ========================================
   How It Works - Pillars
======================================== */
.how-it-works {
  padding: var(--section-padding) 0;
  background: white;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.pillar {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.pillar:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pillar.featured {
  background: linear-gradient(
    135deg,
    var(--primary-500) 0%,
    var(--primary-700) 100%
  );
  color: white;
  border: none;
}

.pillar.featured .pillar-subtitle {
  color: var(--primary-100);
}

.pillar.featured .pillar-features li {
  color: rgba(255, 255, 255, 0.9);
}

.pillar.featured .pillar-features li::before {
  color: var(--primary-200);
}

.pillar-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 24px;
  color: var(--primary-500);
}

.pillar.featured .pillar-icon {
  color: white;
}

.pillar-icon svg {
  width: 100%;
  height: 100%;
}

.pillar h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.pillar.featured h3 {
  color: white;
}

.pillar-subtitle {
  font-size: 14px;
  color: var(--primary-600);
  font-weight: 600;
  margin-bottom: 16px;
}

.pillar p {
  color: var(--gray-600);
  margin-bottom: 24px;
  line-height: 1.7;
}

.pillar.featured p {
  color: rgba(255, 255, 255, 0.9);
}

.pillar-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pillar-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--gray-600);
}

.pillar-features li::before {
  content: "✓";
  color: var(--primary-500);
  font-weight: 700;
}

/* ========================================
   Benefits
======================================== */
.benefits {
  padding: var(--section-padding) 0;
  background: var(--gray-50);
}

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

.benefit-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.benefit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.benefit-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-100);
  color: var(--primary-600);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.benefit-icon svg {
  width: 24px;
  height: 24px;
}

.benefit-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.benefit-card p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ========================================
   Use Cases
======================================== */
.use-cases {
  padding: var(--section-padding) 0;
  background: white;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.use-case-card {
  display: flex;
  gap: 24px;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.use-case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.use-case-image {
  flex-shrink: 0;
}

.use-case-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: white;
}

.use-case-icon svg {
  width: 36px;
  height: 36px;
}

.use-case-icon.emergency {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.use-case-icon.events {
  background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.use-case-icon.community {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.use-case-icon.research {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.use-case-content {
  flex: 1;
}

.use-case-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--primary-100);
  color: var(--primary-700);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.use-case-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.use-case-card p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 16px;
}

.use-case-benefit {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--primary-700);
  font-weight: 500;
}

.use-case-benefit svg {
  width: 18px;
  height: 18px;
  color: var(--success);
}

/* ========================================
   SDK Section
======================================== */
.sdk-section {
  padding: var(--section-padding) 0;
  background: var(--gray-50);
}

.sdk-modules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.sdk-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.sdk-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.sdk-card.featured {
  background: linear-gradient(
    135deg,
    var(--primary-500) 0%,
    var(--primary-700) 100%
  );
  color: white;
  border: none;
  transform: scale(1.02);
}

.sdk-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.sdk-header {
  margin-bottom: 16px;
}

.sdk-badge {
  display: inline-block;
  padding: 4px 10px;
  background: var(--primary-100);
  color: var(--primary-700);
  font-size: 11px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.sdk-card.featured .sdk-badge {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.sdk-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  font-family: "Courier New", monospace;
}

.sdk-card.featured h3 {
  color: white;
}

.sdk-card > p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 20px;
}

.sdk-card.featured > p {
  color: rgba(255, 255, 255, 0.9);
}

.sdk-code {
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 20px;
}

.sdk-card.featured .sdk-code {
  background: rgba(0, 0, 0, 0.2);
}

.sdk-code code {
  font-family: "Courier New", monospace;
  font-size: 13px;
  color: var(--gray-700);
}

.sdk-card.featured .sdk-code code {
  color: white;
}

.sdk-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sdk-features li {
  padding: 6px 12px;
  background: var(--gray-100);
  color: var(--gray-600);
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-full);
}

.sdk-card.featured .sdk-features li {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.sdk-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ========================================
   KPIs
======================================== */
.kpis {
  padding: var(--section-padding) 0;
  background: linear-gradient(
    135deg,
    var(--primary-600) 0%,
    var(--primary-800) 100%
  );
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}

.kpi-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-base);
}

.kpi-card:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-4px);
}

.kpi-value {
  font-size: 32px;
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
}

.kpi-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-200);
  margin-bottom: 4px;
}

.kpi-desc {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

/* ========================================
   Contact
======================================== */
.contact {
  padding: var(--section-padding) 0;
  background: white;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.contact-text h2 {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  line-height: 1.2;
}

.contact-text > p {
  font-size: 18px;
  color: var(--gray-500);
  margin-bottom: 32px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 16px;
  color: var(--gray-700);
}

.contact-item svg {
  width: 24px;
  height: 24px;
  color: var(--primary-500);
}

.contact-form {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  font-family: inherit;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  background: white;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-400);
  box-shadow: 0 0 0 3px var(--primary-100);
}

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

/* ========================================
   Footer
======================================== */
.footer {
  background: var(--gray-900);
  color: white;
  padding: 60px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 16px;
  color: white;
}

.footer-brand > p {
  font-size: 15px;
  color: var(--gray-400);
  max-width: 300px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.footer-column h4 {
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column a {
  font-size: 14px;
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--primary-400);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 30px;
  border-top: 1px solid var(--gray-800);
  font-size: 14px;
  color: var(--gray-500);
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .pillars {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }

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

  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .sdk-modules {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto 48px;
  }

  .sdk-card.featured {
    transform: none;
  }

  .kpi-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
  }

  .navbar .container {
    justify-content: space-between;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.active {
    display: flex;
  }

  .lang-selector {
    margin-left: auto;
    margin-right: 12px;
  }

  .lang-btn {
    padding: 6px 10px;
  }

  .lang-btn span:not(.chevron):not(#currentLang) {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-cta {
    flex-direction: column;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }

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

  .use-case-card {
    flex-direction: column;
  }

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

  .sdk-cta {
    flex-direction: column;
    align-items: center;
  }

  .contact-form {
    padding: 24px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .kpi-grid {
    grid-template-columns: 1fr;
  }

  .kpi-value {
    font-size: 28px;
  }
}