:root {
    --red: #c0392b;
    --red-glow: #e74c3c;
    --red-dim: #7b1a12;
    --black: #050505;
    --dark: #0a0a0a;
    --dark2: #111111;
    --dark3: #161616;
    --border: #1e1e1e;
    --border2: #2a2a2a;
    --text: #d0d0d0;
    --text-dim: #707070;
    --text-muted: #333333;
    --display: 'Stack Sans Notch', sans-serif;
    --mono: 'Share Tech Mono', monospace;
    --body: 'Encode Sans', sans-serif;
    --status-done: #2ecc71;
    --status-wip: #f39c12;
    --status-pending: #4a4a4a;
    --sidebar-w: 260px;
    --nav-h: 52px;
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body { background: var(--black); color: var(--text); font-family: var(--mono); overflow-x: hidden; }
  ::-webkit-scrollbar { width: 3px; }
  ::-webkit-scrollbar-track { background: var(--black); }
  ::-webkit-scrollbar-thumb { background: var(--red-dim); }

  /* NAV */
  nav {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--nav-h); z-index: 300;
    padding: 0 2.5rem;
    display: flex; align-items: center; justify-content: space-between;
    background: rgba(5,5,5,0.95);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
  }
  .nav-back { font-size: 0.72rem; letter-spacing: 0.15em; color: var(--text-dim); text-decoration: none; transition: color 0.2s; }
  .nav-back::before { content: '← '; }
  .nav-back:hover { color: var(--red-glow); }
  .nav-center { font-family: var(--display); font-weight: 700; font-size: 1rem; letter-spacing: 0.12em; color: var(--text-dim); }
  .nav-center span { color: var(--red-glow); }
  .nav-count { font-size: 0.65rem; letter-spacing: 0.2em; color: var(--text-muted); }

  /* SIDEBAR */
  .sidebar {
    position: fixed; top: var(--nav-h); left: 0;
    width: var(--sidebar-w); height: calc(100vh - var(--nav-h));
    border-right: 1px solid var(--border); background: var(--dark);
    display: flex; flex-direction: column; z-index: 200;
  }
  .sidebar-header { padding: 1.5rem 1.5rem 1rem; border-bottom: 1px solid var(--border); flex-shrink: 0; }
  .sidebar-cat { font-size: 0.58rem; letter-spacing: 0.45em; color: var(--red-dim); display: block; margin-bottom: 0.4rem; }
  .sidebar-title { font-family: var(--display); font-weight: 700; font-size: 1.1rem; letter-spacing: 0.06em; color: var(--text); }
  .sidebar-list { overflow-y: auto; flex: 1; padding: 0.5rem 0; }
  .sidebar-list::-webkit-scrollbar { width: 2px; }
  .sidebar-list::-webkit-scrollbar-thumb { background: var(--border2); }
  .sidebar-item { display: block; padding: 0.6rem 1.5rem; text-decoration: none; border-left: 2px solid transparent; transition: border-color 0.2s, background 0.2s; }
  .sidebar-item:hover, .sidebar-item.active { background: var(--dark2); border-left-color: var(--red); }
  .sidebar-item-num { font-size: 0.52rem; letter-spacing: 0.3em; color: var(--text-muted); display: block; margin-bottom: 0.15rem; }
  .sidebar-item-name { font-size: 0.68rem; color: var(--text-dim); line-height: 1.4; transition: color 0.2s; display: block; }
  .sidebar-item:hover .sidebar-item-name, .sidebar-item.active .sidebar-item-name { color: var(--text); }
  .sidebar-item-status { display: block; margin-top: 0.2rem; font-size: 0.52rem; letter-spacing: 0.2em; }
  .status-done { color: var(--status-done); }
  .status-wip { color: var(--status-wip); }
  .status-pending { color: var(--status-pending); }
  .sidebar-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--border); flex-shrink: 0; }
  .legend { display: flex; flex-direction: column; gap: 0.35rem; }
  .legend-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.56rem; letter-spacing: 0.15em; color: var(--text-muted); }
  .legend-dot { width: 5px; height: 5px; border-radius: 50%; flex-shrink: 0; }

  /* MAIN */
  .main { margin-left: var(--sidebar-w); padding-top: var(--nav-h); }
  .main-inner { padding: 3rem 3rem 5rem; }

  /* HERO */
  .page-hero { margin-bottom: 3rem; padding-bottom: 2.5rem; border-bottom: 1px solid var(--border); }
  .page-tag { font-size: 0.62rem; letter-spacing: 0.45em; color: var(--red-dim); display: block; margin-bottom: 0.75rem; }
  .page-title { font-family: var(--display); font-weight: 700; font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: 0.04em; color: var(--text); line-height: 1; margin-bottom: 1rem; }
  .page-title span { color: var(--red-glow); }
  .page-desc { font-family: var(--body); font-size: 0.85rem; line-height: 1.9; color: var(--text-dim); max-width: 560px; }
  .page-stats { display: flex; gap: 2rem; margin-top: 1.5rem; }
  .stat-val { font-family: var(--display); font-weight: 700; font-size: 1.6rem; line-height: 1; display: block; }
  .stat-label { font-size: 0.56rem; letter-spacing: 0.3em; color: var(--text-muted); display: block; margin-top: 0.2rem; }

  /* CARDS */
  .articles { display: flex; flex-direction: column; gap: 1px; background: var(--border); border: 1px solid var(--border); }

  .article-card {
    display: flex;
    background: var(--dark);
    text-decoration: none;
    position: relative;
    transition: background 0.25s;
    cursor: pointer;
    min-height: 160px;
    overflow: hidden;
  }
  .article-card:hover { background: var(--dark2); }
  .article-card::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
    background: var(--red); transform: scaleY(0); transform-origin: top;
    transition: transform 0.3s ease; z-index: 1;
  }
  .article-card:hover::before { transform: scaleY(1); }

  /* card left */
  .card-left {
    flex: 1; padding: 1.75rem 1.75rem 1.75rem 2.25rem;
    display: flex; flex-direction: column; justify-content: center; min-width: 0;
  }
  .card-meta { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.6rem; }
  .card-num { font-size: 0.56rem; letter-spacing: 0.35em; color: var(--text-muted); }
  .card-status { font-size: 0.56rem; letter-spacing: 0.2em; display: flex; align-items: center; gap: 0.35rem; }
  .card-status::before { content: ''; width: 5px; height: 5px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
  .card-status.done::before { background: var(--status-done); }
  .card-status.wip::before { background: var(--status-wip); animation: blink 2s infinite; }
  .card-status.pending::before { background: var(--status-pending); }
  .card-status.done { color: var(--status-done); }
  .card-status.wip { color: var(--status-wip); }
  .card-status.pending { color: var(--status-pending); }
  @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.2} }

  .card-title { font-family: var(--display); font-weight: 700; font-size: 1.25rem; letter-spacing: 0.04em; color: var(--text); margin-bottom: 0.5rem; line-height: 1.1; transition: color 0.2s; }
  .article-card:hover .card-title { color: #fff; }
  .card-desc { font-family: var(--body); font-size: 0.78rem; line-height: 1.85; color: var(--text-dim); margin-bottom: 0.85rem; }
  .card-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
  .tag { padding: 0.18rem 0.55rem; border: 1px solid var(--border2); font-size: 0.56rem; letter-spacing: 0.12em; color: var(--text-muted); transition: border-color 0.2s, color 0.2s; }
  .article-card:hover .tag { border-color: var(--red-dim); color: var(--text-dim); }

  /* card right - image panel */
  .card-right {
    width: 50%;
    flex-shrink: 0;
    position: relative;
    background: var(--dark3);
  }

  .card-placeholder {
    position: absolute; inset: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.4rem;
  }
  .ph-icon { font-family: var(--mono); font-size: 0.55rem; letter-spacing: 0.3em; color: var(--border2); }
  .ph-name { font-family: var(--mono); font-size: 0.48rem; letter-spacing: 0.12em; color: var(--border2); padding: 0 0.75rem; text-align: center; word-break: break-all; }

  .card-photo {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    object-position: center;
    width: 100%;
    height: 100%;
    left: 0;
    right: auto;
    opacity: 0;
    transition: opacity 0.4s, filter 0.3s;
    filter: grayscale(15%);
  }
  .card-photo.loaded { opacity: 1; }
  .article-card:hover .card-photo { filter: grayscale(0%); }

  .card-fade {
    position: absolute; inset: 0;
    background: linear-gradient(to right, var(--dark) 0%, transparent 60%);
    pointer-events: none; z-index: 2;
    transition: background 0.25s;
  }
  .article-card:hover .card-fade { background: linear-gradient(to right, var(--dark2) 0%, transparent 60%); }

  .card-arrow {
    position: absolute; bottom: 0.6rem; right: 0.6rem;
    font-size: 0.85rem; color: var(--text-muted);
    z-index: 3; transition: color 0.2s, transform 0.2s; line-height: 1;
  }
  .article-card:hover .card-arrow { color: var(--red-glow); transform: translate(2px,-2px); }

  /* reveal */
  .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s, transform 0.6s; }
  .reveal.visible { opacity: 1; transform: none; }

  /* footer */
  footer {
    margin-left: var(--sidebar-w);
    border-top: 1px solid var(--border); padding: 1.5rem 3rem;
    display: flex; align-items: center; justify-content: space-between;
  }
  .f-logo { font-family: var(--display); font-weight: 700; font-size: 1rem; letter-spacing: 0.1em; color: var(--red); }
  .f-copy { font-size: 0.6rem; letter-spacing: 0.2em; color: var(--text-muted); }
  footer a { font-size: 0.68rem; letter-spacing: 0.12em; color: var(--text-dim); text-decoration: none; transition: color 0.2s; }
  footer a:hover { color: var(--red-glow); }

  @media (max-width: 860px) {
    .sidebar { position: static; width: 100%; height: auto; }
    .main { margin-left: 0; }
    footer { margin-left: 0; }
  }

  @media (max-width: 540px) {
    .card-right { display: none; }
    .main-inner { padding: 2rem 1.25rem 4rem; }
  }

/* card without link */
.article-card.plain { cursor: default; }
.article-card.plain .card-arrow { display: none; }
.article-card.plain:hover { background: var(--dark); }
.article-card.plain:hover .card-title { color: var(--text); }
.article-card.plain:hover .tag { border-color: var(--border2); color: var(--text-muted); }
.article-card.plain:hover .card-photo { filter: grayscale(15%); }
.article-card.plain:hover .card-fade { background: linear-gradient(to right, var(--dark) 0%, transparent 60%); }