/* ── BASE STYLES ── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    
    :root {
      --bg:       #fcfdff; 
      --ink:      #0e2a47; 
      --mid:      #5c7b99;
      --line:     #dce6f0;
      --accent-blue: #00a3ff; 
      --accent-red:  #ff4d4d;
      --display:  'Bebas Neue', sans-serif;
      --sans:     'Noto Sans JP', sans-serif;
      --mono:     'JetBrains Mono', monospace;
      --max-width: 1200px;
    }

    html { scroll-behavior: smooth; }
    
    body {
      background: var(--bg);
      color: var(--ink);
      font-family: var(--sans);
      font-weight: 400;
      line-height: 1.7;
      overflow-x: hidden;
    }

    /* ── POLARYS GRID ── */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 999;
      opacity: .3;
      background-image: 
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
      background-size: 30px 30px;
    }

    /* ── HEADER ── */
    header {
      position: sticky;
      top: 0;
      z-index: 200;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(252, 253, 255, 0.9);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--line);
    }

    .header-inner {
      width: 100%;
      max-width: var(--max-width);
      padding: 0 2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      text-decoration: none;
      color: var(--ink);
      font-family: var(--display);
      font-size: 1.2rem;
      letter-spacing: 0.1em;
    }

    .polarys-icon {
      width: 24px; height: 24px;
      background: var(--accent-blue);
      clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
    }

    /* ── ARCHIVE BANNER ── */
    .archive-header {
      padding: 4rem 2rem 2rem;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    .breadcrumbs {
      font-family: var(--mono);
      font-size: 0.65rem;
      color: var(--mid);
      margin-bottom: 1.5rem;
      display: flex;
      gap: 0.5rem;
      align-items: center;
    }

    .breadcrumbs a { color: var(--mid); text-decoration: none; }
    .breadcrumbs a:hover { color: var(--accent-blue); }

    .archive-title {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      border-bottom: 2px solid var(--ink);
      padding-bottom: 1.5rem;
    }

    .archive-title h1 {
      font-family: var(--display);
      font-size: clamp(3rem, 8vw, 5rem);
      line-height: 1;
    }

    .archive-stats {
      font-family: var(--mono);
      text-align: right;
      font-size: 0.7rem;
      color: var(--mid);
    }

    /* ── SYSTEM NOTICE ── */
    .system-notice {
      max-width: var(--max-width);
      margin: 2rem auto 0;
      padding: 0 2rem;
    }

    .notice-box {
      background: #f0f7ff;
      border-left: 3px solid var(--accent-blue);
      padding: 1.5rem;
      position: relative;
    }
    .notice-box::before {
      content: 'SYSTEM_MESSAGE / LOG';
      position: absolute; top: 0.5rem; right: 1rem;
      font-family: var(--mono); font-size: 0.55rem; color: var(--mid);
    }
    .notice-box p {
      font-size: 0.85rem;
      color: var(--ink);
      max-width: 80ch;
    }

    /* ── DIRECTORY GRID ── */
    .directory-section {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 2rem;
    }

    .dir-label {
      font-family: var(--mono);
      font-size: 0.6rem;
      color: var(--accent-blue);
      margin-bottom: 2rem;
      display: block;
    }

    .data-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 1.5rem;
    }

    .data-card {
      background: white;
      border: 1px solid var(--line);
      text-decoration: none;
      color: inherit;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      overflow: hidden;
    }

    .data-card:hover {
      border-color: var(--accent-blue);
      transform: translateY(-5px);
      box-shadow: 0 15px 30px rgba(0, 163, 255, 0.08);
    }

    .thumbnail-wrap {
      aspect-ratio: 4/3;
      background: #f0f4f8;
      overflow: hidden;
      position: relative;
      border-bottom: 1px solid var(--line);
    }
    .thumbnail-wrap img {
      width: 100%; height: 100%;
      object-fit: cover;
      transition: transform 0.5s;
    }
    .data-card:hover img { transform: scale(1.05); }

    .card-body {
      padding: 1.5rem;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .data-card .meta {
      display: flex;
      justify-content: space-between;
      font-family: var(--mono);
      font-size: 0.55rem;
      color: var(--mid);
      margin-bottom: 0.8rem;
    }

    .status-tag {
      padding: 2px 6px;
      border: 1px solid var(--line);
      border-radius: 2px;
      text-transform: uppercase;
    }
    .status-free { 
      color: var(--accent-red); 
      border-color: var(--accent-red); 
      font-weight: 700;
    }

    .data-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      line-height: 1.4;
    }
    .data-card h3.free-title { color: var(--accent-red); }

    .data-card .footer-info {
      margin-top: auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: var(--mono);
      font-size: 0.6rem;
      color: var(--mid);
    }

    /* ── PERSONNEL / INFO BOX ── */
    .info-footer {
      max-width: var(--max-width);
      margin: 4rem auto;
      padding: 0 2rem;
    }

    .info-box {
      border: 1px solid var(--line);
      background: #f0f4f8;
      padding: 2rem;
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .mini-profile-img {
      width: 80px; height: 80px;
      clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
      background: var(--mid);
      flex-shrink: 0;
      border: 1px solid var(--accent-blue);
    }
    .mini-profile-img img { width: 100%; height: 100%; object-fit: cover; }

    .info-content h4 { font-size: 0.9rem; margin-bottom: 0.2rem; }
    .info-content p { font-size: 0.75rem; color: var(--mid); font-family: var(--mono); }

    /* ── FOOTER ── */
    footer {
      border-top: 1px solid var(--line);
      padding: 2rem;
      text-align: center;
      font-family: var(--mono);
      font-size: 0.6rem;
      color: var(--mid);
    }

    @media (max-width: 768px) {
      .archive-title { flex-direction: column; align-items: flex-start; gap: 1rem; }
      .data-grid { grid-template-columns: 1fr; }
      .info-box { flex-direction: column; text-align: center; }
    }