:root {
      --bg: #03060d;
      --panel: rgba(12, 20, 34, 0.72);
      --panel-strong: rgba(15, 24, 40, 0.92);
      --text: #eef6ff;
      --muted: #a9b8c8;
      --cyan: #36d8ff;
      --blue: #4c7dff;
      --amber: #ffb23f;
      --red: #ff4e5f;
      --line: rgba(125, 210, 255, 0.24);
      --glow: 0 0 32px rgba(54, 216, 255, 0.22);
      --radius: 8px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--text);
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background:
        radial-gradient(circle at 15% 6%, rgba(76, 125, 255, 0.22), transparent 30rem),
        radial-gradient(circle at 85% 12%, rgba(255, 78, 95, 0.16), transparent 26rem),
        radial-gradient(circle at 48% 55%, rgba(255, 178, 63, 0.08), transparent 28rem),
        linear-gradient(180deg, #03060d 0%, #07101d 48%, #020409 100%);
      min-height: 100vh;
      overflow-x: hidden;
    }
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        radial-gradient(circle, rgba(255,255,255,.42) 1px, transparent 1px),
        linear-gradient(rgba(54,216,255,.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(54,216,255,.035) 1px, transparent 1px);
      background-size: 130px 130px, 54px 54px, 54px 54px;
      mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.78) 55%, transparent 100%);
      opacity: .5;
    }
    body::after {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background: repeating-linear-gradient(180deg, rgba(255,255,255,.035) 0, rgba(255,255,255,.035) 1px, transparent 1px, transparent 6px);
      opacity: .08;
      mix-blend-mode: screen;
    }
    a { color: inherit; }
    img { display: block; max-width: 100%; }
    .site-shell { position: relative; z-index: 1; }
    .container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
    .topbar {
      position: sticky;
      top: 0;
      z-index: 10;
      backdrop-filter: blur(18px);
      background: rgba(3, 6, 13, 0.78);
      border-bottom: 1px solid var(--line);
    }
    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; font-size: .82rem; }
    .brand-mark { width: 34px; height: 34px; border: 1px solid var(--line); background: linear-gradient(135deg, rgba(54,216,255,.26), rgba(255,178,63,.18)); box-shadow: var(--glow); clip-path: polygon(50% 0, 100% 28%, 88% 100%, 12% 100%, 0 28%); }
    .menu-toggle { display: none; width: 44px; height: 44px; border-radius: var(--radius); border: 1px solid var(--line); background: rgba(54,216,255,.08); color: var(--text); cursor: pointer; }
    .menu-toggle span { display: block; width: 19px; height: 2px; margin: 5px auto; background: var(--cyan); box-shadow: var(--glow); transition: transform .2s ease, opacity .2s ease; }
    .nav-links { display: flex; align-items: center; gap: 14px; flex-wrap: nowrap; justify-content: flex-end; }
    .nav-links a { color: var(--muted); text-decoration: none; font-size: .74rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; white-space: nowrap; }
    .nav-links a:hover { color: var(--cyan); text-shadow: 0 0 18px rgba(54,216,255,.48); }
    .hero { min-height: 690px; display: grid; align-items: center; padding: 72px 0 44px; }
    .hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, 520px); gap: 44px; align-items: center; }
    .eyebrow { display: inline-flex; gap: 10px; align-items: center; color: var(--cyan); font-weight: 800; text-transform: uppercase; letter-spacing: .14em; font-size: .76rem; }
    .eyebrow::before { content: ""; width: 34px; height: 1px; background: linear-gradient(90deg, var(--cyan), transparent); box-shadow: var(--glow); }
    h1, h2, h3, p { margin-top: 0; }
    h1 { font-size: clamp(3.2rem, 9vw, 7.4rem); line-height: .86; letter-spacing: 0; margin-bottom: 26px; text-transform: uppercase; }
    .hero p { color: #d7e4f2; font-size: clamp(1.02rem, 2vw, 1.22rem); line-height: 1.72; max-width: 720px; }
    .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }
    .button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; border-radius: var(--radius); border: 1px solid rgba(54,216,255,.46); color: var(--text); text-decoration: none; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; font-size: .82rem; background: linear-gradient(135deg, rgba(54,216,255,.16), rgba(76,125,255,.12)); box-shadow: var(--glow); }
    .button.secondary { border-color: rgba(255,178,63,.42); background: rgba(255,178,63,.08); box-shadow: 0 0 28px rgba(255,178,63,.14); }
    .button:hover, .text-link:hover { transform: translateY(-1px); }
    .hero-visual { position: relative; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; background: linear-gradient(145deg, rgba(10,18,31,.84), rgba(10,18,31,.35)); box-shadow: 0 24px 80px rgba(0,0,0,.44), var(--glow); overflow: hidden; }
    .hero-visual::before { content: ""; position: absolute; inset: 12px; border: 1px solid rgba(255,178,63,.2); clip-path: polygon(0 0, 88% 0, 100% 16%, 100% 100%, 12% 100%, 0 84%); pointer-events: none; }
    .hero-visual::after { content: "ARCHIVE_SCAN_1138"; position: absolute; left: 22px; bottom: 20px; color: rgba(54,216,255,.78); font: 700 .72rem ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .14em; }
    .hero-visual img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; padding: 18px; border-radius: 6px; filter: saturate(1.08) contrast(1.08) drop-shadow(0 0 26px rgba(54,216,255,.18)); background: radial-gradient(circle at 50% 45%, rgba(54,216,255,.18), rgba(2,5,12,.2) 48%, rgba(2,5,12,.72)); }
    .section { padding: 76px 0; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
    .section-kicker { color: var(--amber); font-weight: 800; text-transform: uppercase; letter-spacing: .14em; font-size: .74rem; margin-bottom: 10px; }
    h2 { font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1; text-transform: uppercase; margin-bottom: 0; }
    .section-head p { color: var(--muted); line-height: 1.65; max-width: 520px; margin-bottom: 0; }
    .prop-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
    .prop-card, .article-card, .guide-card, .archive-card, .promo-panel, .notice-panel { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); box-shadow: 0 18px 60px rgba(0,0,0,.25); backdrop-filter: blur(14px); overflow: hidden; }
    .prop-card { display: flex; flex-direction: column; min-height: 100%; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
    .prop-card:hover, .article-card:hover, .archive-card:hover { border-color: rgba(54,216,255,.58); box-shadow: 0 20px 70px rgba(0,0,0,.32), var(--glow); transform: translateY(-2px); }
    .prop-media { display: block; background: radial-gradient(circle at 50% 40%, rgba(54,216,255,.18), rgba(0,0,0,.2)); }
    .prop-media img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; padding: 14px; background: radial-gradient(circle at 50% 42%, rgba(54,216,255,.14), rgba(3,6,13,.86) 62%); filter: drop-shadow(0 0 18px rgba(54,216,255,.14)); }
    .prop-copy, .article-copy, .archive-copy { padding: 18px; }
    .tag { display: inline-flex; align-items: center; min-height: 26px; padding: 0 10px; border: 1px solid rgba(54,216,255,.36); border-radius: 999px; color: var(--cyan); background: rgba(54,216,255,.08); font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
    .tag.small { min-height: 22px; font-size: .64rem; }
    h3 { margin: 12px 0 10px; line-height: 1.18; font-size: 1.08rem; }
    .prop-copy p, .article-copy p, .guide-card p, .archive-copy p, .promo-panel p, .notice-panel p { color: var(--muted); line-height: 1.62; margin-bottom: 0; }
    .text-link { display: inline-flex; margin-top: 16px; color: var(--amber); text-decoration: none; font-weight: 900; text-transform: uppercase; letter-spacing: .06em; font-size: .78rem; transition: transform .2s ease, color .2s ease; }
    .guide-link { display: inline-flex; margin-top: 10px; color: var(--cyan); text-decoration: none; font-weight: 800; font-size: .78rem; line-height: 1.35; }
    .guide-link:hover { text-shadow: 0 0 18px rgba(54,216,255,.48); }
    .article-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
    .article-image { background: linear-gradient(135deg, rgba(54,216,255,.12), rgba(255,78,95,.12)); }
    .article-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; padding: 14px; opacity: .9; filter: saturate(.92) contrast(1.08) drop-shadow(0 0 18px rgba(54,216,255,.12)); background: radial-gradient(circle at 50% 42%, rgba(54,216,255,.12), rgba(3,6,13,.82) 64%); }
    .guide-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
    .guide-card { padding: 22px; position: relative; min-height: 190px; color: inherit; text-decoration: none; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
    .guide-card:hover { border-color: rgba(255,178,63,.5); box-shadow: 0 20px 70px rgba(0,0,0,.32), 0 0 26px rgba(255,178,63,.14); transform: translateY(-2px); }
    .guide-card::after { content: ""; position: absolute; inset: auto 18px 18px auto; width: 76px; height: 1px; background: linear-gradient(90deg, transparent, var(--cyan)); box-shadow: var(--glow); }
    .guide-icon { display: block; width: 38px; height: 38px; border: 1px solid rgba(255,178,63,.48); background: linear-gradient(135deg, rgba(255,178,63,.25), rgba(54,216,255,.1)); clip-path: polygon(0 0, 100% 0, 78% 100%, 0 100%); }
    .promo-panel { padding: clamp(28px, 5vw, 54px); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 26px; align-items: center; background: linear-gradient(135deg, rgba(54,216,255,.14), rgba(255,178,63,.1)), var(--panel-strong); }
    .promo-panel p { max-width: 760px; font-size: 1.05rem; }
    .archive-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
    .archive-card { display: flex; flex-direction: column; }
    .archive-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; padding: 12px; background: radial-gradient(circle at 50% 42%, rgba(54,216,255,.12), rgba(8,17,29,.94) 66%); filter: drop-shadow(0 0 16px rgba(54,216,255,.12)); }
    .archive-copy h3 { font-size: .98rem; }
    .archive-copy p { font-size: .9rem; }
    .notice-panel { padding: 22px; border-color: rgba(255,178,63,.28); background: rgba(14, 16, 22, .78); }
    .notice-panel strong { color: var(--amber); }
    .scroll-top { position: fixed; right: 18px; bottom: 18px; z-index: 20; width: 48px; height: 48px; border-radius: 50%; border: 1px solid rgba(54,216,255,.5); background: rgba(3,6,13,.82); color: var(--cyan); box-shadow: var(--glow); cursor: pointer; opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity .2s ease, transform .2s ease; }
    .scroll-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
    footer { padding: 44px 0 56px; border-top: 1px solid var(--line); color: var(--muted); }
    .footer-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 28px; align-items: start; }
    .footer-title { color: var(--text); font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
    .footer-grid p { line-height: 1.66; margin-bottom: 0; }
    @media (max-width: 1100px) {
      .nav { align-items: stretch; flex-direction: row; flex-wrap: wrap; padding: 14px 0; }
      .brand { flex: 1; }
      .menu-toggle { display: block; }
      .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
      .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
      .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
      .nav-links { display: none; width: 100%; flex-direction: column; align-items: stretch; justify-content: flex-start; gap: 0; padding: 10px 0 2px; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 13px 0; border-top: 1px solid rgba(125,210,255,.14); }
    }
    @media (max-width: 980px) {
      .hero-grid, .promo-panel, .footer-grid { grid-template-columns: 1fr; }
      .prop-grid, .guide-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .article-grid, .archive-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .section-head { align-items: start; flex-direction: column; }
    }
    @media (max-width: 680px) {
      .nav { align-items: stretch; flex-direction: row; flex-wrap: wrap; padding: 14px 0; }
      .brand { flex: 1; }
      .menu-toggle { display: block; }
      .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
      .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
      .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
      .nav-links { display: none; width: 100%; flex-direction: column; align-items: stretch; justify-content: flex-start; gap: 0; padding: 10px 0 2px; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 13px 0; border-top: 1px solid rgba(125,210,255,.14); }
      .nav-links a { font-size: .74rem; }
      .hero { min-height: auto; padding-top: 44px; }
      .hero-grid { gap: 28px; }
      h1 { font-size: clamp(3rem, 18vw, 4.8rem); }
      .prop-grid, .article-grid, .guide-grid, .archive-grid { grid-template-columns: 1fr; }
      .section { padding: 54px 0; }
      .hero-actions .button { width: 100%; }
    }
  
    /* 2026-10-10 multipage additions */
    .page-intro { padding: 64px 0 8px; }
    .page-intro h1 { font-size: clamp(2.4rem, 7vw, 4.6rem); line-height: .92; margin: 14px 0 18px; }
    .page-intro p { color: var(--muted); line-height: 1.7; max-width: 760px; font-size: 1.05rem; }
    .section-more { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px; }
    .footer-links { margin-top: 14px; }
    .nav-links a[aria-current="page"], .footer-links a[aria-current="page"] { color: var(--cyan); }
    .prose { max-width: 780px; }
    .prose h2 { font-size: clamp(1.4rem, 3vw, 2rem); text-transform: uppercase; margin: 36px 0 12px; }
    .prose p, .prose li { color: var(--muted); line-height: 1.75; }
    .prose a { color: var(--cyan); }