/* ========================================
   CSS Variables (matching jkca.me)
   ======================================== */
:root {
  --color-bg: #0a0a0a;
  --color-text: #e5e5e5;
  --color-text-secondary: #a0a0a0;
  --color-text-muted: #666666;
  --color-accent: #00ffff;
  --color-border: #2a2a2a;
  
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Consolas', 'Monaco', monospace;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  --container-width: 1200px;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s var(--ease-out-expo);
}

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

/* ========================================
   Header
   ======================================== */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}

.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-xl);
}

.brand-block {
  flex: 1;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0, 255, 255, 0.1);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-sm);
}

.site-title {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

.site-title a {
  color: var(--color-text);
}

.site-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.site-keywords {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.site-keywords span {
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.875rem;
}

.site-nav a {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  transition: background 0.2s var(--ease-out-expo);
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) var(--spacing-md);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  text-align: center;
}

.ip-notice {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.footer-links {
  font-size: 0.875rem;
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
   padding: 0 var(--spacing-md);
}

.prose {
  max-width: 720px;
  line-height: 1.7;
}

.prose h2 {
  font-size: 1.75rem;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.prose p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .site-nav {
    width: 100%;
    flex-wrap: wrap;
  }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}