/* =====================================================
   VirtualShift Landing Page Styles
   Apple-inspired dark theme with premium aesthetics
   ===================================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Colors */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-elevated: #1a1a1a;
  --color-bg-card: rgba(255, 255, 255, 0.03);
  --color-bg-card-hover: rgba(255, 255, 255, 0.06);

  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-tertiary: rgba(255, 255, 255, 0.5);
  --color-text-muted: rgba(255, 255, 255, 0.35);

  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-accent-glow: rgba(0, 113, 227, 0.4);

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-subtle: rgba(255, 255, 255, 0.04);

  --color-success: #30d158;

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

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-hero: clamp(2.5rem, 6vw, 4.5rem);

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.1;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;

  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.02em;

  /* 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;
  --space-32: 8rem;

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

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 60px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --container-max: 1200px;
  --container-padding: var(--space-6);
}

/* 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: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  background-image: radial-gradient(
      ellipse 80% 50% at 50% -20%,
      rgba(0, 113, 227, 0.15),
      transparent
    ),
    linear-gradient(180deg, var(--color-bg-primary) 0%, #0d0d1a 100%);
  min-height: 100vh;
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-md), 0 0 20px rgba(0, 113, 227, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0, 113, 227, 0.4);
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-subtle);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-cta {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-32) 0 var(--space-20);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('assets/images/hero-bg.webp');
    background-size: cover;
    background-position: center bottom;
    opacity: 0.25;
    z-index: -2;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(10, 10, 10, 0.3) 0%, rgba(10, 10, 10, 0.9) 70%, var(--color-bg-primary) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    margin-bottom: var(--space-8);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-full);
    animation: fadeInUp 0.6s ease forwards;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
  background: linear-gradient(
    180deg,
    #ffffff 0%,
    rgba(255, 255, 255, 0.7) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.6s ease 0.1s forwards;
  opacity: 0;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-10);
  line-height: var(--line-height-relaxed);
  animation: fadeInUp 0.6s ease 0.2s forwards;
  opacity: 0;
}

.hero-actions {
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease 0.3s forwards;
  opacity: 0;
}

.hero-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  animation: fadeInUp 0.6s ease 0.4s forwards;
  opacity: 0;
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(0, 113, 227, 0.15) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: -1;
}

/* Sections */
.section {
  padding: var(--space-24) 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/* Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

@media (max-width: 768px) {
  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

.step-card {
  position: relative;
  padding: var(--space-8);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

.step-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border);
  transform: translateY(-4px);
}

.step-number {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  background: rgba(0, 113, 227, 0.1);
  border-radius: var(--radius-full);
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-6);
  color: var(--color-accent);
}

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

.step-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.step-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.feature-item:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border);
}

.feature-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  background: rgba(0, 113, 227, 0.1);
  border-radius: var(--radius-md);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature-item h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* App Preview */
.preview-window {
  max-width: 700px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}

.window-frame {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(180deg, #2a2a2a 0%, #222222 100%);
  border-bottom: 1px solid var(--color-border-subtle);
}

.window-controls {
  display: flex;
  gap: var(--space-2);
}

.control {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
}

.control.close {
  background: #ff5f57;
}
.control.minimize {
  background: #febc2e;
}
.control.maximize {
  background: #28c840;
}

.window-title {
  flex: 1;
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-tertiary);
  margin-right: 52px;
}

.window-content {
  padding: var(--space-10);
}

.app-mockup {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.mockup-header {
  text-align: center;
}

.connection-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border-radius: var(--radius-full);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
}

.status-dot.connected {
  background: var(--color-success);
  animation: pulse 2s infinite;
}

.mockup-gear-display {
  display: flex;
  justify-content: center;
  padding: var(--space-8) 0;
}

.gear-ring {
  width: 160px;
  height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    rgba(0, 113, 227, 0.1) 0%,
    rgba(0, 113, 227, 0.05) 100%
  );
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-full);
  box-shadow: 0 0 40px rgba(0, 113, 227, 0.2);
}

.gear-value {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1;
}

.gear-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  margin-top: var(--space-1);
}

.mockup-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

.shift-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.shift-arrow {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
}

.shift-arrow.down {
  color: var(--color-success);
}
.shift-arrow.up {
  color: var(--color-accent);
}

.gear-range {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

/* Compatibility */
.compatibility-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
}

@media (max-width: 768px) {
  .compatibility-content {
    flex-direction: column;
    text-align: center;
  }
}

.compatibility-text .section-title {
  text-align: left;
  margin-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .compatibility-text .section-title {
    text-align: center;
  }
}

.compatibility-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.compatibility-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .compatibility-list li {
    justify-content: center;
  }
}

.check-icon {
  width: 20px;
  height: 20px;
  color: var(--color-success);
  flex-shrink: 0;
}

.compatibility-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-10);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
}

.macos-icon {
  width: 80px;
  height: 80px;
  color: var(--color-text-primary);
}

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

.badge-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: var(--space-32) 0;
  position: relative;
  overflow: hidden;
}

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

.cta-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-meta {
  margin-top: var(--space-6);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.cta-glow {
  position: absolute;
  bottom: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(
    ellipse at center,
    rgba(0, 113, 227, 0.2) 0%,
    transparent 70%
  );
  pointer-events: none;
}

/* Footer */
.footer {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-border-subtle);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .footer-content {
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
  }
}

.footer-brand .logo {
  margin-bottom: var(--space-2);
}

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

.footer-nav {
  display: flex;
  gap: var(--space-6);
}

.footer-nav a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-disclaimer {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

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

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

/* Scroll animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive adjustments */
@media (max-width: 1024px) {
  :root {
    --container-padding: var(--space-8);
  }

  .section {
    padding: var(--space-20) 0;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: var(--space-5);
  }

  .hero {
    min-height: auto;
    padding: var(--space-24) 0 var(--space-16);
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

  .section {
    padding: var(--space-16) 0;
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-header {
    margin-bottom: var(--space-10);
  }

  .btn-large {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
  }

  .cta-title {
    font-size: var(--font-size-2xl);
  }
}