/* ===== CSS Variables ===== */
:root {
  /* Brand Colors */
  --color-primary: #f59e0b;      /* Amber - drift status */
  --color-primary-dark: #d97706;
  --color-success: #22c55e;       /* Green */
  --color-error: #ef4444;         /* Red */

  /* Neutrals */
  --color-text: #111827;          /* Dark gray */
  --color-text-muted: #6b7280;   /* Medium gray */
  --color-bg: #f9fafb;           /* Light gray */
  --color-card: #ffffff;
  --color-border: #e5e7eb;
  --color-link: #2563eb;         /* Blue */

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

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", Consolas, monospace;

  /* Layout */
  --container-width: 1200px;
  --border-radius: 12px;
  --border-radius-sm: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: var(--spacing-sm);
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ===== Header ===== */
.site-header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background-color: rgba(255, 255, 255, 0.9);
}

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

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-text);
  font-size: 1.25rem;
  font-weight: 700;
}

.logo-image {
  height: 40px;
  width: auto;
}

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

.nav-link {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

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

.github-icon {
  width: 20px;
  height: 20px;
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s;
}

/* ===== Buttons ===== */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.625rem 1.5rem;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all 0.2s;
  border: 2px solid transparent;
}

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

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

.btn-secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

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

.btn-large {
  padding: 0.875rem 2rem;
  font-size: 1rem;
}

/* ===== Hero Section ===== */
.hero {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, #fef3c7 0%, #f9fafb 100%);
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-logo {
  height: 120px;
  width: auto;
  margin-bottom: var(--spacing-md);
}

.hero-title {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.hero-tagline {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.hero-meta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Badges ===== */
.badge,
.version-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.version-badge {
  background: var(--color-primary);
  color: white;
  border: none;
}

/* ===== Star Banner ===== */
.star-banner {
  background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
  border-bottom: 1px solid rgba(245, 158, 11, 0.3);
  padding: 0.75rem 0;
  position: relative;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.star-banner.hidden {
  display: none;
}

.star-banner-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.star-banner-text {
  font-size: 0.9375rem;
  color: var(--color-text);
  font-weight: 500;
}

.star-banner-link {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-underline-offset: 2px;
  font-weight: 600;
  transition: all 0.2s;
}

.star-banner-link:hover {
  color: var(--color-primary);
  text-decoration-thickness: 2px;
}

.star-banner-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  color: var(--color-text-muted);
  transition: color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.star-banner-close:hover {
  color: var(--color-text);
}

.star-banner-close svg {
  width: 16px;
  height: 16px;
}

/* ===== Sections ===== */
section {
  padding: var(--spacing-xl) 0;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
}

/* ===== What Section ===== */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.content-text h3 {
  margin-bottom: var(--spacing-sm);
}

.feature-list {
  list-style: none;
  margin-top: var(--spacing-md);
}

.feature-list li {
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-xs);
  position: relative;
}

.feature-list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

.screenshot {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

/* ===== Features Grid ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.feature-card {
  background: var(--color-card);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

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

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--color-text-muted);
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* ===== Quick Start Tabs ===== */
.quickstart-tabs {
  background: var(--color-card);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.tab-buttons {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.tab-btn {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--color-text);
  background: rgba(245, 158, 11, 0.05);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  display: none;
  padding: var(--spacing-md);
}

.tab-content.active {
  display: block;
}

.tab-content h3 {
  margin-bottom: var(--spacing-sm);
}

.tab-content pre {
  background: #1e293b;
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

.tab-content code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: #e2e8f0;
  line-height: 1.6;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--spacing-sm);
}

/* ===== CTA Section ===== */
.section-cta {
  background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
  text-align: center;
}

.cta-content h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.cta-content p {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
  margin-bottom: var(--spacing-lg);
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.footer-logo-image {
  height: 40px;
  margin-bottom: var(--spacing-sm);
}

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

.footer-column h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 0.5rem;
}

.footer-column a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-tagline {
    font-size: 1.25rem;
  }

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

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

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

  .tab-buttons {
    flex-wrap: wrap;
  }

  .tab-btn {
    flex: 1 1 50%;
  }

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

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

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

  .nav-links {
    display: none;
  }

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