/* ========================================
   DuttLabs - Main Stylesheet
   Premium iOS App Portfolio
   ======================================== */

/* CSS Custom Properties */
:root {
  /* Colors - Dark Mode (Default) - Modern & Rich */
  --color-primary: #7C3AED;
  --color-primary-light: #A78BFA;
  --color-secondary: #EC4899;
  --color-accent: #06B6D4;
  --color-accent-light: #22D3EE;
  --color-success: #10B981;

  --bg-primary: #09090B;
  --bg-secondary: #0F0F11;
  --bg-tertiary: #161618;
  --bg-card: #131316;
  --bg-card-hover: #1A1A1E;
  --bg-glass: rgba(15, 15, 17, 0.9);
  --bg-elevated: #1C1C20;

  --text-primary: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;

  --border-color: rgba(255, 255, 255, 0.1);
  --border-color-hover: rgba(255, 255, 255, 0.18);
  --border-gradient: linear-gradient(135deg, rgba(124, 58, 237, 0.5), rgba(236, 72, 153, 0.5), rgba(6, 182, 212, 0.5));

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #7C3AED 0%, #EC4899 50%, #06B6D4 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(236, 72, 153, 0.1) 50%, rgba(6, 182, 212, 0.05) 100%);
  --gradient-card: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(236, 72, 153, 0.04) 100%);
  --gradient-glow: radial-gradient(circle at center, rgba(124, 58, 237, 0.2) 0%, transparent 70%);
  --gradient-mesh: radial-gradient(at 40% 20%, rgba(124, 58, 237, 0.3) 0px, transparent 50%),
                   radial-gradient(at 80% 0%, rgba(236, 72, 153, 0.2) 0px, transparent 50%),
                   radial-gradient(at 0% 50%, rgba(6, 182, 212, 0.2) 0px, transparent 50%),
                   radial-gradient(at 80% 50%, rgba(124, 58, 237, 0.15) 0px, transparent 50%),
                   radial-gradient(at 0% 100%, rgba(236, 72, 153, 0.15) 0px, transparent 50%);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, Monaco, 'Cascadia Code', monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.25);
  --shadow-glow-pink: 0 0 30px rgba(236, 72, 153, 0.2);
  --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.2);
  --shadow-glow-multi: 0 0 40px rgba(124, 58, 237, 0.2), 0 0 60px rgba(236, 72, 153, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-tooltip: 400;
}

/* Light Mode */
[data-theme="light"] {
  --bg-primary: #FAFAFA;
  --bg-secondary: #F4F4F5;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F9FAFB;
  --bg-glass: rgba(255, 255, 255, 0.9);

  --text-primary: #18181B;
  --text-secondary: #52525B;
  --text-tertiary: #A1A1AA;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(0, 0, 0, 0.15);

  --shadow-sm: 0 1px 2px 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, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

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

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

input, button, textarea, select {
  font: inherit;
}

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

ul, ol {
  list-style: none;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: 1.25rem;
}

p {
  color: var(--text-secondary);
}

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

.text-accent {
  color: var(--color-accent);
}

/* ========================================
   Layout
   ======================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-wide {
  max-width: 1400px;
}

.container-narrow {
  max-width: 800px;
}

section {
  padding: var(--spacing-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-md);
}

.section-header p {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Header & Navigation
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--spacing-md) 0;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.header.scrolled {
  padding: var(--spacing-sm) 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
  font-size: 1.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

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

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: 73px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: var(--z-dropdown);
  padding: var(--spacing-xl);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.mobile-nav-link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: 100px;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(124, 58, 237, 0.3) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 50%, rgba(236, 72, 153, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse 50% 30% at 20% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 80%);
}

.hero-orbs {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  animation: float 20s infinite ease-in-out;
}

.hero-orb:nth-child(1) {
  width: 400px;
  height: 400px;
  background: var(--color-primary);
  top: -100px;
  left: -100px;
  animation-delay: 0s;
}

.hero-orb:nth-child(2) {
  width: 300px;
  height: 300px;
  background: var(--color-secondary);
  top: 50%;
  right: -50px;
  animation-delay: -7s;
}

.hero-orb:nth-child(3) {
  width: 250px;
  height: 250px;
  background: var(--color-accent);
  bottom: -50px;
  left: 30%;
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -30px) scale(1.05); }
  50% { transform: translate(-20px, 20px) scale(0.95); }
  75% { transform: translate(20px, 30px) scale(1.02); }
}

.hero-content {
  text-align: center;
  max-width: 900px;
  padding: 0 var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.6s ease-out;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #22C55E;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-tagline {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-tertiary);
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-3xl);
  margin-top: var(--spacing-4xl);
  animation: fadeInUp 0.6s ease-out 0.5s both;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: var(--spacing-xs);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md), 0 0 20px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(124, 58, 237, 0.35);
}

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

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn svg {
  width: 20px;
  height: 20px;
}

/* ========================================
   Filter Tabs
   ======================================== */

.filter-section {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
}

.filter-tab {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

/* ========================================
   App Cards Grid
   ======================================== */

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.app-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  overflow: hidden;
  text-decoration: none;
  display: block;
}

.app-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.app-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

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

.app-card-content {
  position: relative;
  z-index: 1;
}

.app-card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.app-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.app-icon-gradient-1 { background: linear-gradient(135deg, #F472B6, #EC4899); }
.app-icon-gradient-2 { background: linear-gradient(135deg, #60A5FA, #3B82F6); }
.app-icon-gradient-3 { background: linear-gradient(135deg, #34D399, #10B981); }
.app-icon-gradient-4 { background: linear-gradient(135deg, #FBBF24, #F59E0B); }
.app-icon-gradient-5 { background: linear-gradient(135deg, #A78BFA, #8B5CF6); }
.app-icon-gradient-6 { background: linear-gradient(135deg, #F87171, #EF4444); }
.app-icon-gradient-7 { background: linear-gradient(135deg, #6366F1, #4F46E5); }
.app-icon-gradient-8 { background: linear-gradient(135deg, #2DD4BF, #14B8A6); }
.app-icon-gradient-9 { background: linear-gradient(135deg, #FB923C, #F97316); }
.app-icon-gradient-10 { background: linear-gradient(135deg, #818CF8, #6366F1); }

.app-card-info {
  flex: 1;
  min-width: 0;
}

.app-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.app-tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.app-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.app-category {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.app-platforms {
  display: flex;
  gap: var(--spacing-sm);
}

.platform-icon {
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.app-card:hover .platform-icon {
  color: var(--text-secondary);
}

.app-arrow {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  opacity: 0;
  transform: translate(-10px, 10px);
  transition: all var(--transition-base);
}

.app-card:hover .app-arrow {
  opacity: 1;
  transform: translate(0, 0);
}

/* Card animations */
.app-card[data-animate] {
  opacity: 0;
  transform: translateY(20px);
}

.app-card.animated {
  animation: cardFadeIn 0.5s ease-out forwards;
}

@keyframes cardFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Features Section
   ======================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   About Section (Homepage)
   ======================================== */

.about-section {
  background: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  aspect-ratio: 4/5;
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
}

.about-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 4rem;
}

.about-image-glow {
  position: absolute;
  inset: -20%;
  background: var(--gradient-glow);
  z-index: -1;
}

.about-text h2 {
  margin-bottom: var(--spacing-lg);
}

.about-text p {
  margin-bottom: var(--spacing-md);
  font-size: 1.0625rem;
  line-height: 1.7;
}

.about-text .btn {
  margin-top: var(--spacing-lg);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  margin-bottom: var(--spacing-md);
}

.footer-brand p {
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-lg);
}

.footer-social {
  display: flex;
  gap: var(--spacing-sm);
}

.social-link {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.social-link svg {
  width: 18px;
  height: 18px;
}

.footer-column h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-lg);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.footer-legal {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-legal a {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.footer-legal a:hover {
  color: var(--text-secondary);
}

/* ========================================
   Page Headers (Inner Pages)
   ======================================== */

.page-header {
  padding: calc(100px + var(--spacing-4xl)) 0 var(--spacing-4xl);
  background: var(--bg-secondary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(124, 58, 237, 0.15) 0%, transparent 50%);
}

.page-header-content {
  position: relative;
  z-index: 1;
}

.page-title {
  margin-bottom: var(--spacing-md);
}

.page-description {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Content Sections (Inner Pages)
   ======================================== */

.content-section {
  padding: var(--spacing-3xl) 0;
}

.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.content-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.content-card p {
  margin-bottom: var(--spacing-md);
}

.content-card p:last-child {
  margin-bottom: 0;
}

.content-card ul {
  list-style: disc;
  padding-left: var(--spacing-xl);
  color: var(--text-secondary);
}

.content-card li {
  margin-bottom: var(--spacing-sm);
}

/* Prose styles for long-form content */
.prose {
  color: var(--text-secondary);
  line-height: 1.8;
}

.prose h2 {
  color: var(--text-primary);
  margin-top: var(--spacing-3xl);
  margin-bottom: var(--spacing-lg);
  font-size: 1.75rem;
}

.prose h3 {
  color: var(--text-primary);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

.prose p {
  margin-bottom: var(--spacing-md);
}

.prose ul, .prose ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: var(--spacing-sm);
}

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose a:hover {
  color: var(--color-primary-light);
}

.prose strong {
  color: var(--text-primary);
  font-weight: 600;
}

.prose blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  font-style: italic;
  color: var(--text-tertiary);
}

/* ========================================
   FAQ Section
   ======================================== */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--bg-card-hover);
}

.faq-icon {
  width: 24px;
  height: 24px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-answer-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ========================================
   Press Kit
   ======================================== */

.press-assets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.press-asset {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.press-asset:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
}

.press-asset-preview {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 2rem;
}

.press-asset-name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.press-asset-info {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* ========================================
   Contact Form
   ======================================== */

.contact-form {
  max-width: 600px;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

/* ========================================
   Scroll Animations
   ======================================== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.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; }

/* ========================================
   Scroll to Top Button
   ======================================== */

.scroll-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.scroll-top svg {
  width: 20px;
  height: 20px;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .about-image {
    order: -1;
    max-width: 400px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
  }

  .footer-brand {
    grid-column: 1 / -1;
    max-width: none;
    text-align: center;
  }

  .footer-brand .logo {
    justify-content: center;
  }

  .footer-social {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  section {
    padding: var(--spacing-3xl) 0;
  }

  .nav-links,
  .nav-actions .theme-toggle {
    display: none;
  }

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

  .mobile-nav {
    display: block;
  }

  .hero {
    min-height: calc(100vh - 50px);
    padding-top: 80px;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-xl);
  }

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

  .hero-cta .btn {
    width: 100%;
  }

  .filter-tabs {
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }

  .filter-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
  }

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

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

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

  .footer-column {
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
  }

  .page-header {
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
  }

  .content-card {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 15px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .logo {
    font-size: 1.25rem;
  }

  .logo-icon {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .hero-badge {
    font-size: 0.8125rem;
  }

  .app-card {
    padding: var(--spacing-lg);
  }

  .app-icon {
    width: 50px;
    height: 50px;
    font-size: 1.25rem;
  }

  .scroll-top {
    width: 44px;
    height: 44px;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
  }
}

/* ========================================
   Accessibility
   ======================================== */

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

  .hero-orb {
    animation: none;
  }
}

/* Focus states */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
  outline: none;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-md);
}

/* ========================================
   Utility Classes
   ======================================== */

.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;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-md { margin-top: var(--spacing-md); }
.mb-md { margin-bottom: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none !important; }
.visible { visibility: visible !important; }
.invisible { visibility: hidden !important; }