/* ==========================================================================
   CSS Architecture layers
   ========================================================================== */
@layer reset, base, theme, components, utilities;

@layer reset {
  html, body, h1, h2, h3, p, ul, li, figure, pre {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  *, *::before, *::after {
    box-sizing: inherit;
  }

  body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
  }

  button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
  }

  button {
    cursor: pointer;
  }

  img, svg {
    max-width: 100%;
    display: block;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}

@layer base {
  :root {
    /* Color Palette - Simple Black and White Theme */
    --bg-primary: #000000;
    --bg-secondary: #080808;
    --bg-tertiary: #121212;
    --border-color: #1a1a1a;
    --border-hover: #333333;
    
    --color-primary: #ffffff;
    --color-secondary: #888888;
    --color-muted: #444444;
    
    /* Sparse Accent Color (Very minimal orange) */
    --color-accent: #ff5722;
    --color-accent-rgb: 255, 87, 34;
    
    --color-stable: #ffffff;
    --color-beta: #888888;
    --color-alpha: #444444;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Space Grotesk', var(--font-sans);
    --font-mono: 'Space Mono', 'JetBrains Mono', monospace;
    
    /* Layout */
    --max-width: 1100px;
    --header-height: 70px;
    --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.12s ease;
  }

  html {
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--color-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
  }

  body {
    min-height: 100vh;
    position: relative;
    background-color: var(--bg-primary);
  }

  *:focus-visible {
    outline: 1px solid var(--color-primary);
    outline-offset: 4px;
  }
}

@layer theme {
  /* Subtle tech dot-grid pattern */
  .grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
    opacity: 0.15;
    background-size: 30px 30px;
    background-image: radial-gradient(var(--border-hover) 1px, transparent 1px);
    mask-image: radial-gradient(ellipse at 50% 50%, black 50%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 50%, transparent 100%);
  }

  /* Remove colorful ambient glows */
  .radial-glow {
    display: none;
  }
}

@layer components {
  /* Minimalist Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-display);
    font-weight: 500;
    padding: 10px 20px;
    border-radius: 2px;
    transition: var(--transition-smooth);
    font-size: 0.9rem;
    position: relative;
    border: 1px solid transparent;
  }

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

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

  .btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--color-primary);
  }

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

  .btn-tertiary {
    background-color: transparent;
    color: var(--color-secondary);
    padding: 10px 0;
  }

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

  /* Badge (Minimalist, only dot is orange) */
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    padding: 5px 10px;
    border-radius: 2px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
  }

  .badge-dot {
    width: 5px;
    height: 5px;
    background-color: var(--color-accent);
    border-radius: 50%;
  }

  /* Header */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
  }

  .header-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .logo {
    display: flex;
    align-items: center;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
  }

  .logo-image {
    height: 24px;
    width: auto;
    margin-right: 8px;
    opacity: 0.9;
  }

  .logo-text {
    color: var(--color-primary);
  }

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

  .nav-link {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--color-secondary);
    transition: var(--transition-fast);
  }

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

  /* Hero Section */
  .hero-section {
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 80px;
    position: relative;
    display: flex;
    align-items: center;
  }

  .hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-logo {
    max-height: 240px;
    width: auto;
    margin-top: 24px;
    margin-bottom: 16px;
    opacity: 1;
    transition: transform var(--transition-smooth);
  }

  .hero-logo:hover {
    transform: scale(1.03);
  }

  .hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.75rem);
    line-height: 1.15;
    font-weight: 700;
    margin-top: 20px;
    margin-bottom: 20px;
    letter-spacing: -0.01em;
  }

  .gradient-text {
    /* Pure monochrome clean gradient */
    background: linear-gradient(180deg, #ffffff 30%, #888888 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-subtitle {
    font-size: clamp(0.95rem, 1.8vw, 1.1rem);
    color: var(--color-secondary);
    max-width: 620px;
    margin-bottom: 32px;
    line-height: 1.5;
  }

  .hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
  }

  /* Sections general */
  .section {
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
  }

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

  .section-header {
    margin-bottom: 48px;
  }

  .section-tag {
    font-family: var(--font-mono);
    color: var(--color-secondary);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
  }

  .section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 12px;
  }

  .section-subtitle {
    font-size: 1rem;
    color: var(--color-secondary);
    max-width: 500px;
  }

  /* Projects Grid & Cards (Solid Flat Row Layout) */
  .projects-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  .project-card {
    background-color: transparent;
    border: none;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    padding: 40px 0;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
  }

  .project-card:first-child {
    border-top: 1px solid var(--border-color);
  }

  .project-card:hover {
    background-color: rgba(255, 255, 255, 0.01);
  }

  .project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
  }

  .project-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .project-status {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 1px 6px;
    border-radius: 2px;
    width: fit-content;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
  }

  .status-stable { color: var(--color-primary); }
  .status-beta { color: var(--color-secondary); }
  .status-alpha { color: var(--color-muted); }

  .project-name {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
  }

  .project-icon-wrapper {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: 2px;
    color: var(--color-primary);
  }

  .project-description {
    color: var(--color-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
    line-height: 1.6;
    max-width: 800px;
  }

  .project-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    margin-top: auto;
  }

  .project-tech {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-muted);
  }

  .project-link {
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-primary);
    transition: var(--transition-smooth);
  }

  .project-link:hover {
    color: var(--color-secondary);
  }

  /* Philosophy Section (Simplified) */
  .philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
  }

  .philosophy-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 32px;
    transition: var(--transition-smooth);
  }

  .philosophy-card:hover {
    border-color: var(--border-hover);
  }

  .philosophy-num {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-muted);
    margin-bottom: 16px;
    transition: color var(--transition-smooth);
  }

  .philosophy-card:hover .philosophy-num {
    color: var(--color-secondary);
  }

  .philosophy-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
  }

  .philosophy-text {
    color: var(--color-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
  }

  /* Technical Infrastructure (Simplified) */
  .tech-layout {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
  }

  .tech-subheading {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
  }

  .tech-desc {
    color: var(--color-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
  }

  .tech-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .tech-list li {
    display: flex;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--color-secondary);
  }

  .tech-list li strong {
    color: var(--color-primary);
  }

  .tech-list-icon {
    width: 20px;
    height: 20px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
  }

  /* Tech Visualization Diagram (Simplified) */
  .tech-viz-pane {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 32px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 260px;
  }

  .viz-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .viz-node {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 10px 16px;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    text-align: center;
    width: fit-content;
    background-color: var(--bg-primary);
  }

  .viz-core {
    border-color: var(--color-primary);
    color: var(--color-primary);
    font-weight: 700;
  }

  .viz-arrow-vertical {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    position: relative;
  }

  .viz-arrow-vertical::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-width: 3px 3px 0 3px;
    border-style: solid;
    border-color: var(--border-color) transparent transparent transparent;
  }

  .viz-grid-nodes {
    display: flex;
    gap: 12px;
    width: 100%;
    justify-content: space-between;
  }

  .viz-child {
    flex: 1;
    font-size: 0.7rem;
    padding: 8px 4px;
    color: var(--color-secondary);
    transition: var(--transition-smooth);
  }

  .viz-child:hover {
    border-color: var(--border-hover);
    color: var(--color-primary);
  }

  .viz-caption {
    font-size: 0.65rem;
    color: var(--color-muted);
    margin-top: 20px;
  }

  /* Footer */
  .footer {
    background-color: #000000;
    border-top: 1px solid var(--border-color);
    padding: 48px 0 32px;
  }

  .footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

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

  .footer-tagline {
    font-size: 0.85rem;
    color: var(--color-secondary);
  }

  .footer-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    flex-wrap: wrap;
    gap: 16px;
  }

  .copyright {
    font-size: 0.75rem;
    color: var(--color-muted);
  }

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

  .footer-link-icon {
    color: var(--color-secondary);
    transition: var(--transition-fast);
  }

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

@layer utilities {
  /* Scroll-driven reveal effects (Progressive Enhancement) */
  @media (prefers-reduced-motion: no-preference) {
    @supports ((animation-timeline: view()) and (animation-range: entry)) {
      @keyframes reveal-in {
        from {
          opacity: 0;
          transform: translateY(20px) scale(0.99);
        }
        to {
          opacity: 1;
          transform: translateY(0) scale(1);
        }
      }

      .section, .project-card, .philosophy-card, .tech-layout {
        animation: reveal-in auto linear forwards;
        animation-timeline: view();
        animation-range: entry 5% entry 35%;
      }
    }
  }

  /* Fallback classes for browsers without scroll-driven animations support */
  .js-reveal {
    opacity: 0;
    transform: translateY(20px) scale(0.99);
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .js-reveal.revealed {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .tech-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: 0 16px;
  }
  
  .nav {
    display: none;
  }

  .hero-section {
    padding-top: calc(var(--header-height) + 30px);
    padding-bottom: 48px;
  }

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



  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}