:root {
    --color-header-bg:    #1f2123;   
    --color-header-text:  #f5f8fd;  
    --color-accent:       #5ba3e0;   
    --color-accent-dim:   #f5f8fd;  
  
    --color-section-bg:   #eff6fc;   
    --color-section-bdr:  #b8d4ed;   
    --color-section-text: #1a5a9a;   
  
    --color-page-bg:      #f5f5f3;  
    --color-white:        #ffffff;
    --color-text:         #111111;   
    --color-text-meta:    #616161;   
    --color-border:       #e0e0dc;   
    --color-hover:        #e0e0e0;   
  
    --color-dot-gray:     #bbbbbb;   
  

    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
    --font-sans: 'IBM Plex Sans', system-ui, sans-serif;

    --spacing-xs:  4px;
    --spacing-sm:  8px;
    --spacing-md:  16px;
    --spacing-lg:  24px;
    --spacing-xl:  40px;

    --max-width: 950px;
  }
  
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-mono);
    background: var(--color-page-bg);
    color: var(--color-text);
    font-size: 13px;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  a {
    color: inherit;
    text-decoration: none;
  }
  
  .work-list {
    flex: 1;
  }

  .site-header {
    background: var(--color-header-bg);
    position: sticky;   
    top: 0;
    z-index: 100;       
  }
  
  .header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 14px var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: 0;
    flex-wrap: wrap;
  }
  
  .header-arrow {
    color: var(--color-accent);
    font-size: 16px;
    margin-right: 6px;
    line-height: 1;
  }
  
  .header-name {
    color: var(--color-header-text);
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 0.08em;
    flex: 1;
  }
  

  .cursor {
    display: inline-block;
    width: 7px;
    height: 13px;
    background: var(--color-accent);
    margin-left: 3px;
    vertical-align: text-bottom;
    animation: blink 1.2s step-end infinite;
  }
  
  @keyframes blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
  }
  
  .header-status {
    font-size: 13px;
    color: var(--color-accent-dim);
    letter-spacing: 0.06em;
  }

  .status-value {
    color: var(--color-accent);
  }
  
  .filter-nav {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  
  .filter-nav::-webkit-scrollbar { display: none; }
  
  .filter-btn {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-meta);
    padding: 11px 18px;
    background: none;
    border: none;
    border-right: 1px solid var(--color-border);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
  }
  
  .filter-btn:hover {
    background: var(--color-hover);
    color: var(--color-text);
  }
  
  .filter-btn.active {
    background: var(--color-header-bg);
    color: var(--color-accent);
  }
  
  .filter-link {
    margin-left: auto;  
    border-right: none;
    border-left: 1px solid var(--color-border);
  }
  
  .work-list {
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
  }
  
  .section-head {
    background: #f0f0ee;
    border-top: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    padding: 8px var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text-meta);
  }
  
  .section-head[data-section="viz"] {
    background: var(--color-section-bg);
    border-top-color: var(--color-section-bdr);
    border-bottom-color: var(--color-section-bdr);
    color: var(--color-section-text);
  }

  .section-head[data-section="writing"] {
    background: var(--color-section-bg);
    border-top-color: var(--color-section-bdr);
    border-bottom-color: var(--color-section-bdr);
    color: var(--color-section-text);
  }
  
  .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: middle;
    position: relative;
    top: -1px;
  }
  
  .dot-blue { background: var(--color-accent); }
  .dot-gray { background: var(--color-dot-gray); }
  

  .work-item {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 14px var(--spacing-lg);
    display: grid;
    grid-template-columns: 72px 1fr auto;
    align-items: center;
    gap: var(--spacing-md);
    transition: background 0.12s;
  }
  
  .work-item:hover {
    background: var(--color-hover);
  }
  
  .item-id {
    font-size: 12px;
    color: var(--color-accent);
    opacity: 0.65;
    letter-spacing: 0.04em;
  }
  

  .item-title {
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    display: block;
    margin-bottom: 3px;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 0% 1px;
    background-repeat: no-repeat;
    background-position: 0 100%;
    transition: background-size 0.2s;
  }
  
  .item-title:hover {
    background-size: 100% 1px;
  }
  
  .item-meta {
    font-size: 11px;
    color: var(--color-text-meta);
    letter-spacing: 0.03em;
  }
  

  .tag {
    font-size: 10px;
    font-family: var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 3px 9px;
    border-radius: 2px;
    white-space: nowrap;
  }
  
  .tag-blue {
    background: var(--color-section-bg);
    border: 1px solid var(--color-section-bdr);
    color: var(--color-section-text);
  }
  
  .tag-gray {
    background: #f0f0ee;
    border: 1px solid #ddd;
    color: #666;
  }
  

  .photo-placeholder {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 28px var(--spacing-lg);
    font-size: 12px;
    color: #bbb;
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }
  
  .about {
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    border: 1px solid var(--color-border);
    border-top: 2px solid var(--color-header-bg);  
    background: var(--color-white);
  }
  
  .about-inner {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
  }
  
  .about-name {
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 5px;
  }
  
  .about-desc {
    font-size: 11px;
    color: var(--color-text-meta);
    line-height: 1.7;
    max-width: 480px;
  }
  
  .about-links {
    display: flex;
    gap: var(--spacing-md);
    flex-shrink: 0;
  }
  
  .about-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-meta);
    transition: border-color 0.15s, color 0.15s, background 0.15s;
  }
  
  .about-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-section-bg);
  }
  

  .about-link svg {
    width: 16px;
    height: 16px;
  }
  
  .site-footer {
    background: var(--color-header-bg);
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    padding: 10px var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    font-size: 9px;
    letter-spacing: 0.1em;
    color: var(--color-accent-dim);
  }

  @media (max-width: 520px) {
    .work-item {
      grid-template-columns: 1fr auto;
    }
  
    .item-id {
      display: none;
    }
  
    .about-inner {
      flex-direction: column;
      align-items: flex-start;
    }
  
    .filter-btn {
      padding: 11px 14px;
      font-size: 9px;
    }
  }
  
  
  .hidden {
    display: none !important;
  }