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

:root {
  --primary: #2da44e;
  --primary-dark: #1a7f37;
  --secondary: #24292f;
  --accent: #0969da;
  --highlight-self: #d1ecf1;
  --highlight-other: #fff3cd;
  --text: #1f2328;
  --text-light: #656d76;
  --bg: #ffffff;
  --bg-alt: #f6f8fa;
  --border: #d0d7de;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

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

a:hover {
  text-decoration: underline;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 18px;
  color: var(--secondary);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  color: var(--text-light);
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* Hero */
.hero {
  padding: 160px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, #2da44e, #0969da, #8250df);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 20px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 40px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-secondary:hover {
  background: #32383f;
  text-decoration: none;
  transform: translateY(-2px);
}

/* Preview */
.preview {
  padding: 40px 0 80px;
}

.screenshot {
  text-align: center;
}

.screenshot-img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* Highlight Demo */
.highlight-demo {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  max-width: 600px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.8;
}

.highlight-self {
  background-color: var(--highlight-self);
  color: #000000;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 3px;
  padding: 1px 3px;
  font-weight: 600;
}

.highlight-other {
  background-color: var(--highlight-other);
  color: #000000;
  border-radius: 3px;
  padding: 1px 3px;
  font-weight: 500;
}

/* Features */
.features {
  padding: 80px 0;
  background: var(--bg-alt);
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background: white;
  padding: 32px;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-light);
}

/* How It Works */
.how-it-works {
  padding: 80px 0;
}

.how-it-works h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 48px;
}

.steps {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.step {
  text-align: center;
  max-width: 280px;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step p {
  color: var(--text-light);
  font-size: 14px;
}

/* Install */
.install {
  padding: 80px 0;
  background: var(--bg-alt);
}

.install h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 48px;
}

.install-options {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.install-card {
  background: white;
  padding: 48px;
  border-radius: 16px;
  border: 1px solid var(--border);
  text-align: center;
  min-width: 280px;
}

.install-card img {
  margin-bottom: 24px;
}

.install-card h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.install-card p {
  color: var(--text-light);
  margin-bottom: 24px;
}

/* Footer */
.footer {
  padding: 48px 0;
  background: var(--secondary);
  color: white;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

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

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover {
  color: white;
}

.copyright {
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

.copyright a {
  color: rgba(255, 255, 255, 0.7);
}

/* Content Pages (Privacy, etc.) */
.content-page {
  padding: 120px 0 80px;
}

.content-page .container {
  max-width: 800px;
}

.content-header {
  text-align: center;
  margin-bottom: 48px;
}

.content-header h1 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 12px;
}

.content-header .subtitle {
  color: var(--text-light);
  font-size: 16px;
}

.content-body h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
  color: var(--secondary);
}

.content-body h2:first-child {
  margin-top: 0;
}

.content-body p {
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.8;
}

.content-body ul {
  margin: 16px 0;
  padding-left: 24px;
}

.content-body li {
  color: var(--text-light);
  margin-bottom: 12px;
  line-height: 1.7;
}

.content-body code {
  background: var(--bg-alt);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 14px;
  color: var(--accent);
}

.content-body strong {
  color: var(--text);
}

.highlight-box {
  background: linear-gradient(135deg, rgba(45, 164, 78, 0.1), rgba(9, 105, 218, 0.1));
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
}

.highlight-box p {
  margin: 0;
  color: var(--text);
  font-weight: 500;
}

.icon-list {
  list-style: none;
  padding-left: 0;
}

.icon-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.icon-list li::before {
  content: "✓";
  color: var(--primary);
  font-weight: bold;
  flex-shrink: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }

  .hero-description {
    font-size: 16px;
  }

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

  .nav {
    display: none;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
  }

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

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

  .content-page {
    padding: 100px 0 60px;
  }

  .content-header h1 {
    font-size: 32px;
  }

  .content-body h2 {
    font-size: 20px;
    margin: 32px 0 12px;
  }

  .highlight-box {
    padding: 16px 20px;
  }
}