:root {
    --bg: #f3eee7;
    --panel: #ffffff;
    --panel-soft: #f8f4ee;
    --panel-tint: #efe7dc;
    --line: rgba(25, 24, 28, 0.11);
    --line-strong: rgba(25, 24, 28, 0.2);
    --text: #19181c;
    --text-dim: #5e5851;
    --accent: #285a63;
    --accent-soft: rgba(40, 90, 99, 0.08);
    --gold: #8a6830;
    --bg-ink: #13161d;
    --max: 1220px;
    --radius: 26px;
    --shadow: 0 28px 80px rgba(18, 15, 11, 0.08);
    --font-display: "Source Serif 4", Georgia, serif;
    --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background:
      radial-gradient(circle at top right, rgba(138, 104, 48, 0.08), transparent 24%),
      linear-gradient(180deg, #f1ebe3 0%, #f8f4ed 38%, #f4efe7 100%);
    color: var(--text);
    font-family: var(--font-body);
  }
  body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
      linear-gradient(rgba(25, 24, 28, 0.025) 1px, transparent 1px),
      linear-gradient(90deg, rgba(25, 24, 28, 0.02) 1px, transparent 1px);
    background-size: 34px 34px;
    mask-image: radial-gradient(circle at center, black 36%, transparent 88%);
    opacity: 0.3;
  }
  a { color: inherit; text-decoration: none; }
  .shell { width: min(calc(100% - 2rem), var(--max)); margin: 0 auto; }
  .topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(248, 244, 237, 0.92);
    backdrop-filter: blur(22px);
    border-bottom: 1px solid rgba(25, 24, 28, 0.08);
    box-shadow: 0 10px 24px rgba(18, 15, 11, 0.03);
  }
  .topbar__inner { width: min(calc(100% - 2rem), var(--max)); margin: 0 auto; padding: 1rem 0; display: flex; justify-content: space-between; gap: 1rem; align-items: center; flex-wrap: wrap; }
  .brand { display: flex; align-items: center; gap: 0.8rem; }
  .brand__mark { width: 2.6rem; height: 2.6rem; border-radius: 999px; display: grid; place-items: center; background: linear-gradient(135deg, #173039 0%, #285a63 100%); color: #f7f2ea; font-family: var(--font-display); font-weight: 700; box-shadow: 0 14px 30px rgba(23, 48, 57, 0.18); }
  .brand__eyebrow { display: block; font-size: 0.72rem; color: var(--gold); letter-spacing: 0.18em; text-transform: uppercase; }
  .brand__title { display: block; font-size: 1rem; font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
  .topbar__links { display: flex; gap: 1rem; flex-wrap: wrap; }
  .topbar__links a { color: var(--text-dim); font-size: 0.92rem; letter-spacing: 0.02em; }
  .topbar__links a:hover { color: var(--accent); }
  .hero { padding: 4.8rem 0 2.9rem; }
  .hero__grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr); gap: 1.4rem; }
  .hero__panel, .hero__aside, .section-card, .paper-card, .report-card, .signal-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
  .hero__panel {
    padding: 2.4rem;
    background:
      radial-gradient(circle at top right, rgba(138, 104, 48, 0.08), transparent 26%),
      linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.88));
  }
  .eyebrow { margin: 0 0 0.8rem; color: var(--gold); font-size: 0.78rem; letter-spacing: 0.2em; text-transform: uppercase; }
  .hero h1 { margin: 0; font-family: var(--font-display); font-size: clamp(3.1rem, 5.8vw, 4.9rem); line-height: 0.95; letter-spacing: -0.052em; }
  .hero__lede { margin: 1.25rem 0 0; max-width: 52rem; color: var(--text-dim); font-size: 1.08rem; line-height: 1.82; }
  .hero__actions { margin-top: 1.5rem; display: flex; gap: 0.8rem; flex-wrap: wrap; }
  .btn { display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; padding: 0.95rem 1.28rem; font-weight: 700; transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease; }
  .btn:hover { transform: translateY(-1px); }
  .btn--primary { background: linear-gradient(135deg, #173039 0%, #285a63 100%); color: #fff; border: 1px solid #173039; box-shadow: 0 16px 34px rgba(23, 48, 57, 0.18); }
  .btn--secondary { background: rgba(255,255,255,0.55); border: 1px solid var(--line-strong); color: var(--text); }
  .hero__aside { padding: 1.25rem; display: flex; flex-direction: column; gap: 1rem; background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(248,244,238,0.95)); }
  .hero__stat { padding: 1.1rem; border-radius: 20px; background: var(--panel-soft); border: 1px solid var(--line); }
  .hero__stat strong { display: block; font-size: 1.5rem; font-family: var(--font-display); margin-bottom: 0.2rem; }
  .section { padding: 1.8rem 0 0.9rem; }
  .section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; margin-bottom: 1rem; }
  .section-head h2 { margin: 0.25rem 0 0; font-family: var(--font-display); font-size: 2.2rem; letter-spacing: -0.04em; }
  .section-head p { margin: 0.6rem 0 0; color: var(--text-dim); line-height: 1.78; max-width: 50rem; }
  .pill { display: inline-flex; align-items: center; border-radius: 999px; padding: 0.45rem 0.82rem; background: var(--accent-soft); color: var(--accent); font-size: 0.8rem; font-weight: 700; }
  .paper-grid, .paper-catalog, .report-grid, .signal-grid { display: grid; gap: 1rem; }
  .paper-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .paper-catalog { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 1rem; }
  .paper-card, .report-card, .signal-card, .section-card { padding: 1.5rem; background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(251,248,242,0.9)); transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease; }
  .paper-card:hover, .report-card:hover, .signal-card:hover, .section-card:hover { transform: translateY(-2px); border-color: rgba(25, 24, 28, 0.18); box-shadow: 0 22px 54px rgba(18, 15, 11, 0.1); }
  .paper-card--lead { grid-column: span 2; }
  .paper-card h3, .report-card h3, .section-card h3 { margin: 0; font-family: var(--font-display); font-size: 1.6rem; letter-spacing: -0.03em; }
  .paper-card__meta, .report-card__meta { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; flex-wrap: wrap; }
  .paper-card__body, .report-card p, .section-card p { color: var(--text-dim); line-height: 1.75; }
  .paper-card__abstract { margin-top: 0.95rem; padding: 1rem 1.05rem; border-radius: 18px; background: var(--panel-soft); border: 1px solid var(--line); }
  .paper-card__abstract strong { display: block; margin-bottom: 0.4rem; font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold); }
  .paper-card__links { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1rem; font-size: 0.88rem; color: var(--accent); }
  .paper-card__links a:hover { text-decoration: underline; }
  .paper-card__actions, .report-card__actions { margin-top: 1.2rem; display: flex; gap: 0.8rem; flex-wrap: wrap; }
  .split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
  .catalog-grid { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.9fr); gap: 1rem; align-items: start; }
  .catalog-stack { display: grid; gap: 1rem; }
  .catalog-aside { position: sticky; top: 5.8rem; }
  .catalog-card { background: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, var(--panel-tint) 100%); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); overflow: hidden; }
  .catalog-card__top { padding: 1.3rem 1.35rem 0.78rem; border-bottom: 1px solid rgba(40,90,99,0.09); }
  .catalog-card__eyebrow { margin: 0 0 0.45rem; color: var(--gold); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.18em; }
  .catalog-card__title { margin: 0; font-family: var(--font-display); font-size: 1.52rem; line-height: 1.08; letter-spacing: -0.03em; }
  .catalog-card__meta { display: flex; flex-wrap: wrap; gap: 0.55rem 0.9rem; margin-top: 0.8rem; color: var(--text-dim); font-size: 0.88rem; }
  .catalog-card__body { padding: 1rem 1.35rem 1.25rem; display: grid; gap: 1rem; }
  .catalog-card__abstract { margin: 0; color: var(--text-dim); line-height: 1.74; }
  .catalog-card__footer { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; flex-wrap: wrap; }
  .catalog-card__keywords { display: flex; gap: 0.45rem; flex-wrap: wrap; }
  .catalog-chip { display: inline-flex; align-items: center; padding: 0.34rem 0.62rem; border-radius: 999px; background: rgba(40,90,99,0.08); color: var(--accent); font-size: 0.75rem; font-weight: 600; }
  .catalog-card__actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }
  .catalog-card__actions a { color: var(--accent); font-weight: 700; font-size: 0.9rem; }
  .catalog-card__actions a:hover { text-decoration: underline; }
  .catalog-sidecard { padding: 1.4rem; background: linear-gradient(180deg, rgba(22, 27, 39, 0.97), rgba(28, 34, 46, 0.95)); border: 1px solid rgba(20, 25, 38, 0.08); border-radius: 24px; box-shadow: var(--shadow); display: grid; gap: 1rem; }
  .catalog-sidecard h3 { margin: 0; font-family: var(--font-display); font-size: 1.42rem; letter-spacing: -0.03em; color: #edf1f7; }
  .catalog-sidecard p, .catalog-sidecard li { margin: 0; color: rgba(237, 241, 247, 0.74); line-height: 1.7; }
  .catalog-sidecard ul { margin: 0; padding-left: 1rem; display: grid; gap: 0.5rem; }
  .catalog-sidecard .text-link { font-weight: 700; }
  .section-card ul { margin: 0.9rem 0 0 1.1rem; padding: 0; color: var(--text-dim); }
  .section-card li { margin: 0.45rem 0; }
  .text-link { color: var(--accent); font-weight: 600; }
  .text-link:hover { text-decoration: underline; }
  .signal-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .signal-card h3 { margin: 0; font-size: 1.1rem; }
  .signal-card p { color: var(--text-dim); line-height: 1.65; }
  .footer { padding: 2.4rem 0 3.6rem; color: var(--text-dim); font-size: 0.9rem; }
  @media (max-width: 980px) {
    .hero__grid, .paper-grid, .paper-catalog, .split, .signal-grid, .catalog-grid { grid-template-columns: 1fr; }
    .catalog-aside { position: static; }
    .paper-card--lead { grid-column: auto; }
  }
  @media (max-width: 720px) {
    .hero { padding-top: 3.4rem; }
    .hero__panel, .hero__aside, .paper-card, .report-card, .signal-card, .section-card, .catalog-sidecard { padding: 1.15rem; }
    .catalog-card__top, .catalog-card__body { padding-left: 1rem; padding-right: 1rem; }
  }