:root {
        --navy: #0a1628;
        --blue: #1a3a6b;
        --accent: #2563eb;
        --accent-light: #60a5fa;
        --white: #ffffff;
        --gray-50: #f8fafc;
        --gray-100: #f1f5f9;
        --gray-200: #e2e8f0;
        --gray-400: #94a3b8;
        --gray-600: #475569;
        --gray-800: #1e293b;
        --text: #0f172a;
        --divider: #e2e8f0;
      }

      *,
      *::before,
      *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }
      html {
        scroll-behavior: smooth;
      }
      body {
        font-family: "Sora", sans-serif;
        color: var(--text);
        background: var(--white);
        overflow-x: hidden;
      }

      /* ── NAV ── */
      nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 3rem;
        height: 64px;
        background: rgba(10, 22, 40, 0.97);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.07);
      }

      .nav-logo {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        text-decoration: none;
      }

      .nav-logo-icon {
        width: 36px;
        height: 36px;
        background: linear-gradient(135deg, var(--accent), var(--accent-light));
        border-radius: 8px;
        display: grid;
        place-items: center;
        font-family: "JetBrains Mono", monospace;
        font-size: 0.7rem;
        font-weight: 500;
        color: #fff;
      }

      .nav-logo span {
        font-size: 0.85rem;
        font-weight: 600;
        color: #fff;
      }

      .nav-links {
        display: flex;
        gap: 2rem;
        list-style: none;
      }

      .nav-links a {
        color: rgba(255, 255, 255, 0.7);
        text-decoration: none;
        font-size: 0.82rem;
        font-weight: 500;
        letter-spacing: 0.04em;
        transition: color 0.2s;
      }

      .nav-links a:hover,
      .nav-links a.active {
        color: #fff;
      }

      .nav-links a.active {
        border-bottom: 2px solid var(--accent-light);
        padding-bottom: 2px;
      }

      .hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        background: none;
        border: none;
      }

      .hamburger span {
        display: block;
        width: 24px;
        height: 2px;
        background: #fff;
      }

      /* ── PAGE HEADER ── */
      .page-header {
        margin-top: 64px;
        background: var(--navy);
        padding: 4rem 0 3rem;
        position: relative;
        overflow: hidden;
      }

      .page-header::before {
        content: "";
        position: absolute;
        inset: 0;
        background: radial-gradient(
          ellipse 70% 80% at 80% 50%,
          rgba(37, 99, 235, 0.2) 0%,
          transparent 70%
        );
      }

      .page-header .container {
        position: relative;
        z-index: 1;
      }

      .breadcrumb {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-size: 0.75rem;
        color: rgba(255, 255, 255, 0.4);
        margin-bottom: 0.75rem;
        font-family: "JetBrains Mono", monospace;
      }

      .breadcrumb a {
        color: rgba(255, 255, 255, 0.4);
        text-decoration: none;
      }
      .breadcrumb a:hover {
        color: rgba(255, 255, 255, 0.7);
      }
      .breadcrumb span {
        color: rgba(255, 255, 255, 0.25);
      }

      .page-header h1 {
        font-family: "DM Serif Display", serif;
        font-size: clamp(2rem, 4vw, 3rem);
        color: #fff;
        margin-bottom: 0.5rem;
      }

      .page-header p {
        color: rgba(255, 255, 255, 0.5);
        font-size: 0.9rem;
        font-weight: 300;
      }

      /* ── LAYOUT ── */
      .main-layout {
        /* display: grid; */
        grid-template-columns: 220px 1fr;
        max-width: 1140px;
        margin: 0 auto;
        padding: 3rem 2rem;
        gap: 3rem;
      }

      /* ── SIDEBAR ── */
      .sidebar {
        position: sticky;
        top: 84px;
        align-self: start;
      }

      .sidebar-section {
        margin-bottom: 2rem;
      }

      .sidebar-title {
        font-size: 0.7rem;
        font-weight: 700;
        color: var(--gray-400);
        letter-spacing: 0.12em;
        text-transform: uppercase;
        margin-bottom: 0.75rem;
        padding-bottom: 0.4rem;
        border-bottom: 1px solid var(--gray-200);
      }

      .sidebar-menu {
        list-style: none;
      }

      .sidebar-menu li + li {
        margin-top: 0.1rem;
      }

      .sidebar-menu a {
        display: block;
        padding: 0.45rem 0.75rem;
        border-radius: 6px;
        font-size: 0.82rem;
        font-weight: 500;
        color: var(--gray-600);
        text-decoration: none;
        transition: all 0.2s;
      }

      .sidebar-menu a:hover {
        background: var(--gray-100);
        color: var(--navy);
      }

      .sidebar-menu a.active {
        background: rgba(37, 99, 235, 0.08);
        color: var(--accent);
        font-weight: 600;
      }

      .sidebar-years {
        list-style: none;
      }
      .sidebar-years li + li {
        margin-top: 0.1rem;
      }

      .sidebar-years button {
        display: block;
        width: 100%;
        padding: 0.35rem 0.75rem;
        border-radius: 6px;
        font-size: 0.8rem;
        font-weight: 500;
        color: var(--gray-600);
        background: none;
        border: none;
        cursor: pointer;
        text-align: left;
        transition: all 0.2s;
        font-family: "JetBrains Mono", monospace;
      }

      .sidebar-years button:hover {
        background: var(--gray-100);
        color: var(--navy);
      }
      .sidebar-years button.active {
        background: rgba(37, 99, 235, 0.08);
        color: var(--accent);
        font-weight: 600;
      }

      /* ── CONTENT ── */

      .pub-type-tabs {
        display: flex;
        gap: 0.5rem;
        margin-bottom: 2.5rem;
        border-bottom: 2px solid var(--gray-100);
        padding-bottom: 0;
      }

      .pub-tab {
        padding: 0.6rem 1.25rem;
        font-size: 0.82rem;
        font-weight: 600;
        color: var(--gray-400);
        border: none;
        background: none;
        cursor: pointer;
        border-bottom: 2px solid transparent;
        margin-bottom: -2px;
        transition: all 0.2s;
        font-family: "Sora", sans-serif;
      }

      .pub-tab:hover {
        color: var(--navy);
      }

      .pub-tab.active {
        color: var(--accent);
        border-bottom-color: var(--accent);
      }

      /* ── YEAR GROUP ── */
      .year-group {
        margin-bottom: 3rem;
      }

      .year-group[data-hidden="true"] {
        display: none;
      }

      .year-label {
        font-family: "DM Serif Display", serif;
        font-size: 1.5rem;
        color: var(--navy);
        margin-bottom: 1.25rem;
        display: flex;
        align-items: center;
        gap: 1rem;
      }

      .year-label::after {
        content: "";
        flex: 1;
        height: 1px;
        background: var(--gray-200);
      }

      .year-count {
        font-family: "JetBrains Mono", monospace;
        font-size: 0.72rem;
        font-weight: 500;
        color: var(--gray-400);
        background: var(--gray-100);
        padding: 0.2rem 0.6rem;
        border-radius: 999px;
      }

      /* ── PUB ENTRY ── */
      .pub-entry {
        padding: 1.5rem 0;
        border-bottom: 1px solid var(--divider);
        /* display: grid; */
        grid-template-columns: 1fr auto;
        gap: 1.5rem;
        align-items: start;
      }

      .pub-entry:last-child {
        border-bottom: none;
      }

      .pub-venue-badge {
        display: inline-block;
        font-family: "JetBrains Mono", monospace;
        font-size: 0.68rem;
        font-weight: 500;
        padding: 0.2rem 0.65rem;
        border-radius: 4px;
        margin-bottom: 0.6rem;
        letter-spacing: 0.06em;
      }

      .badge-top {
        background: rgba(245, 158, 11, 0.12);
        color: #d97706;
      }
      .badge-conf {
        background: rgba(37, 99, 235, 0.1);
        color: var(--accent);
      }
      .badge-find {
        background: rgba(139, 92, 246, 0.1);
        color: #7c3aed;
      }
      .badge-patent {
        background: rgba(16, 185, 129, 0.1);
        color: #059669;
      }

      .pub-entry h3 {
        font-size: 0.95rem;
        font-weight: 600;
        color: var(--navy);
        line-height: 1.45;
        margin-bottom: 0.45rem;
      }

      .pub-entry .authors {
        font-size: 0.8rem;
        color: var(--gray-600);
        line-height: 1.6;
        margin-bottom: 0.3rem;
        font-weight: 300;
      }

      .pub-entry .authors strong {
        color: var(--navy);
        font-weight: 600;
      }

      .pub-entry .venue-full {
        font-size: 0.78rem;
        color: var(--gray-400);
        margin-bottom: 4.8px;
        font-style: italic;
      }

      .pub-links-col {
        display: flex;
        flex-direction: column;
        gap: 0.4rem;
        min-width: 80px;
      }

      .pill-link {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.3rem;
        padding: 0.32rem 0.75rem;
        border-radius: 6px;
        font-size: 0.72rem;
        font-weight: 600;
        text-decoration: none;
        border: 1px solid var(--gray-200);
        color: var(--gray-600);
        transition: all 0.2s;
        white-space: nowrap;
      }

      .pill-link:hover {
        border-color: var(--accent);
        color: var(--accent);
        background: rgba(37, 99, 235, 0.04);
      }

      .pill-link.paper {
        border-color: rgba(37, 99, 235, 0.3);
        color: var(--accent);
      }
      .pill-link.code {
        border-color: rgba(16, 185, 129, 0.3);
        color: #059669;
      }
      .pill-link.demo {
        border-color: rgba(245, 158, 11, 0.3);
        color: #d97706;
      }

      /* ── STATS BAR ── */
      .stats-bar {
        display: flex;
        gap: 2rem;
        padding: 1.25rem 1.5rem;
        background: var(--gray-50);
        border-radius: 12px;
        border: 1px solid var(--gray-200);
        margin-bottom: 2.5rem;
        flex-wrap: wrap;
      }

      .stat {
        display: flex;
        flex-direction: column;
        gap: 0.15rem;
      }

      .stat-num {
        font-family: "DM Serif Display", serif;
        font-size: 1.4rem;
        color: var(--navy);
      }

      .stat-label {
        font-size: 0.7rem;
        color: var(--gray-400);
        letter-spacing: 0.06em;
        text-transform: uppercase;
        font-weight: 500;
      }

      /* ── FOOTER ── */
      footer {
        background: var(--navy);
        padding: 2rem;
        text-align: center;
        font-size: 0.78rem;
        color: rgba(255, 255, 255, 0.35);
      }

      /* ── MOBILE ── */
      @media (max-width: 900px) {
        nav {
          padding: 0 1.5rem;
        }
        .nav-links {
          display: none;
        }
        .nav-links.open {
          display: flex;
          flex-direction: column;
          position: fixed;
          top: 64px;
          left: 0;
          right: 0;
          background: var(--navy);
          padding: 1.5rem 2rem;
          border-top: 1px solid rgba(255, 255, 255, 0.08);
          gap: 1.25rem;
        }
        .hamburger {
          display: flex;
        }
        .main-layout {
          grid-template-columns: 1fr;
        }
        .sidebar {
          position: static;
        }
        .pub-type-tabs {
          overflow-x: auto;
        }
        .pub-entry {
          grid-template-columns: 1fr;
        }
        .pub-links-col {
          flex-direction: row;
          flex-wrap: wrap;
        }
      }