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

:root {
  --color-bg: #fafafa;
  --color-bg-alt: #ffffff;
  --color-text: #171717;
  --color-text-muted: #525252;
  --color-text-subtle: #737373;
  --color-border: #e5e5e5;
  --color-border-hover: #d4d4d4;
  --color-primary: #171717;
  --color-primary-hover: #262626;
  --color-accent: #3b82f6;
  --color-accent-light: #dbeafe;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --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, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: 18px;
}

.logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.github-link .icon {
  width: 18px;
  height: 18px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-xl {
  padding: 18px 36px;
  font-size: 18px;
  border-radius: var(--radius-lg);
}

/* Hero Section */
.hero {
  padding: 80px 0;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
}

.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

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

/* Video Demo */
.demo-video {
  max-width: 900px;
  margin: 0 auto;
}

.video-container {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--color-text);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 18px;
  font-weight: 500;
}

.video-placeholder.hidden {
  display: none;
}

.play-icon {
  width: 64px;
  height: 64px;
  fill: rgba(255, 255, 255, 0.9);
}

/* Section Styles */
.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

/* Features Section */
.features {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-base);
}

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

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

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-accent);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* Compatibility Section */
.compatibility {
  padding: 100px 0;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.tool-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.tool-name {
  font-weight: 500;
  font-size: 15px;
}

/* Privacy Section */
.privacy {
  padding: 100px 0;
  background: var(--color-text);
  color: #ffffff;
}

.privacy-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.privacy-icon {
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 32px;
}

.privacy-icon svg {
  width: 40px;
  height: 40px;
  stroke: #ffffff;
}

.privacy h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 24px;
}

.privacy p {
  font-size: 18px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 16px;
}

.privacy a {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.privacy a:hover {
  text-decoration-thickness: 2px;
}

/* How It Works Section */
.how-it-works {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  text-align: center;
  padding: 20px;
}

.step-number {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  margin: 0 auto 24px;
}

.step h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.step p {
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* FAQ Section */
.faq {
  padding: 100px 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item summary {
  padding: 24px 0;
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 24px;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 0 24px 0;
  color: var(--color-text-muted);
  line-height: 1.7;
  font-size: 15px;
}

.faq-item code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: var(--color-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* Install Section */
.install {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
  text-align: center;
}

.install-cta {
  margin-top: 48px;
}

.install-note {
  margin-top: 16px;
  color: var(--color-text-subtle);
  font-size: 14px;
}

.chrome-icon {
  width: 24px;
  height: 24px;
}

/* Footer */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}

.footer-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast);
}

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

.footer-copy {
  color: var(--color-text-subtle);
  font-size: 14px;
}

/* Mobile Styles */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    display: none;
  }

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

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

  .hero {
    padding: 48px 0;
  }

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

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

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

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

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

  .install {
    padding: 80px 0;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .tool-card {
    padding: 16px 12px;
  }
}