/* ==========================================================================
   PUFFCO-PY DESIGN SYSTEM (main.css)
   Clean Developer Tool Aesthetic — Dark Slate, Monochrome Blue Accent
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Core palette */
  --bg: #0d1117;
  --bg-surface: #161b22;
  --bg-card: #1c2128;
  --bg-inset: #0d1117;

  /* Text */
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;

  /* Accent */
  --accent: #58a6ff;
  --accent-muted: rgba(88, 166, 255, 0.15);
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;

  /* Borders & Shadows */
  --border: #30363d;
  --border-muted: #21262d;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Layout */
  --container-max: 1080px;
  --nav-height: 60px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* ==========================================================================
   BASE RESET
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-body);
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
}

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

code, pre {
  font-family: var(--font-mono);
}

code {
  font-size: 0.875em;
  background: var(--bg-inset);
  border: 1px solid var(--border-muted);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

/* ==========================================================================
   NAVIGATION BAR — Consistent across all pages
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  padding: 0;
  margin: 0;
  line-height: 1;
}

.brand-logo img {
  height: 28px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.brand-logo .accent {
  color: var(--accent);
}

.brand-badge {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  background: var(--accent-muted);
  color: var(--accent);
  border: 1px solid rgba(88, 166, 255, 0.3);
  padding: 1px 7px;
  border-radius: 20px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.nav-link.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* GitHub button in nav */
.btn-github {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.btn-github:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

/* Mobile hamburger */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.mobile-toggle:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

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

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

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
}

/* ==========================================================================
   HERO SECTION — Homepage only
   ========================================================================== */
.hero {
  padding: 64px 0 60px;
  text-align: center;
}

.hero-logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.hero-logo {
  height: 84px;
  width: auto;
  display: block;
  filter: drop-shadow(0 4px 20px rgba(56, 139, 253, 0.28));
  transition: transform var(--transition-normal), filter var(--transition-normal);
}

.hero-logo:hover {
  transform: translateY(-2px) scale(1.04);
  filter: drop-shadow(0 8px 30px rgba(56, 139, 253, 0.45));
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.hero-title .accent {
  color: var(--accent);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* Install snippet */
.install-box {
  display: inline-flex;
  align-items: center;
  gap: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.install-cmd {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-primary);
  padding: 10px 16px;
  user-select: all;
}

.install-cmd .prompt {
  color: var(--text-muted);
  margin-right: 8px;
  user-select: none;
}

.btn-copy {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-left: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  padding: 10px 12px;
  transition: all var(--transition-fast);
}

.btn-copy:hover {
  color: var(--accent);
  background: var(--accent-muted);
}

.btn-copy.copied {
  color: var(--green);
}

/* CTA row */
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* Compatibility badges */
.compat-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid var(--border-muted);
}

.compat-item {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.compat-item .check {
  color: var(--green);
  font-weight: 700;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: 32px 0;
}

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

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-right {
  display: flex;
  align-items: center;
}

.btn-coffee {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(240, 183, 70, 0.1);
  color: #f0b746;
  border: 1px solid rgba(240, 183, 70, 0.28);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.825rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
}

.btn-coffee:hover {
  background: #f0b746;
  color: #0d1117;
  border-color: #f0b746;
  box-shadow: 0 2px 12px rgba(240, 183, 70, 0.3);
  transform: translateY(-1px);
}

.btn-coffee svg {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.btn-coffee:hover svg {
  transform: scale(1.08);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
  list-style: none;
}

.footer-link {
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 720px;
  margin-top: 20px;
}

/* ==========================================================================
   COOKIE CONSENT BANNER
   ========================================================================== */
.cookie-banner {
  position: fixed;
  bottom: 20px;
  left: 20px;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  display: none;
  animation: slideUp 0.3s ease;
}

.cookie-banner.show {
  display: block;
}

@keyframes slideUp {
  from { transform: translateY(40px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.cookie-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.cookie-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 14px;
}

.cookie-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 16px;
    gap: 4px;
  }

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

  .nav-link {
    width: 100%;
    padding: 10px 12px;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    padding: 40px 0 36px;
  }

  .hero-logo {
    height: 68px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .compat-strip {
    gap: 10px;
  }

  .compat-item {
    font-size: 0.72rem;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 12px;
  }
}