*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

    :root {
      --font-body: "Inter", system-ui, sans-serif;
      --font-display: "Playfair Display", Georgia, serif;
      --radius: 10px;
      --radius-lg: 14px;
      --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
      --max-w: 1060px;
      --nav-h: 56px;
    }

    [data-theme="dark"] {
      --bg: #0b0b0e;
      --bg-raised: #101014;
      --bg-hover: #17171c;
      --bg-subtle: #1c1c22;
      --bg-glass: rgba(11, 11, 14, 0.86);
      --border: #1f1f26;
      --border-hover: #2c2c35;
      --text: #e2e2e8;
      --text-secondary: #8e8e99;
      --text-muted: #55555e;
      --accent: #34d399;
      --accent-hover: #2ec48d;
      --accent-subtle: rgba(52, 211, 153, 0.07);
      --accent-medium: rgba(52, 211, 153, 0.13);
      --code-bg: #151519;
    }

    [data-theme="light"] {
      --bg: #f7f7f5;
      --bg-raised: #ffffff;
      --bg-hover: #efefed;
      --bg-subtle: #e8e8e5;
      --bg-glass: rgba(247, 247, 245, 0.88);
      --border: #deded9;
      --border-hover: #ccccc8;
      --text: #18181b;
      --text-secondary: #5c5c64;
      --text-muted: #9c9ca4;
      --accent: #059669;
      --accent-hover: #047857;
      --accent-subtle: rgba(5, 150, 105, 0.05);
      --accent-medium: rgba(5, 150, 105, 0.1);
      --code-bg: #efefed;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      transition: background 0.35s var(--ease), color 0.35s var(--ease);
      overflow-x: hidden;
    }

    ::selection { background: var(--accent); color: #fff; }
    a { color: inherit; text-decoration: none; }

    .i {
      font-family: "Material Symbols Outlined";
      font-size: 20px;
      line-height: 1;
      vertical-align: middle;
      font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    }

    .progress {
      position: fixed;
      top: 0;
      left: 0;
      height: 2px;
      background: var(--accent);
      z-index: 999;
      width: 0%;
      transition: width 80ms linear;
      pointer-events: none;
    }

    nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--bg-glass);
      backdrop-filter: blur(20px) saturate(1.4);
      -webkit-backdrop-filter: blur(20px) saturate(1.4);
      border-bottom: 1px solid var(--border);
      transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
    }

    .nav-inner {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 0 28px;
      height: var(--nav-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-family: var(--font-display);
      font-size: 1.25rem;
      letter-spacing: -0.5px;
      cursor: pointer;
      user-select: none;
    }

    .logo span { color: var(--accent); }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.82rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 7px 14px;
      border-radius: 8px;
      transition: color 0.2s, background 0.2s;
    }

    .nav-links a:hover { color: var(--text); background: var(--bg-hover); }

    .nav-right { display: flex; align-items: center; gap: 6px; }

    .search-trigger {
      display: flex;
      align-items: center;
      gap: 8px;
      background: var(--bg-raised);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 0.78rem;
      color: var(--text-muted);
      cursor: pointer;
      transition: border-color 0.2s, color 0.2s;
      font-family: var(--font-body);
    }

    .search-trigger:hover { border-color: var(--border-hover); color: var(--text-secondary); }

    .search-trigger kbd {
      font-family: var(--font-body);
      font-size: 0.68rem;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 4px;
      padding: 1px 5px;
      margin-left: 6px;
    }

    .icon-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      border-radius: 8px;
      border: 1px solid var(--border);
      background: var(--bg-raised);
      color: var(--text-secondary);
      cursor: pointer;
      transition: border-color 0.2s, color 0.2s;
    }

    .icon-btn:hover { border-color: var(--border-hover); color: var(--text); }
    .icon-btn .i { font-size: 17px; }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text);
      cursor: pointer;
      padding: 4px;
    }

    .overlay {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 500;
      background: rgba(0, 0, 0, 0.45);
      backdrop-filter: blur(4px);
      align-items: flex-start;
      justify-content: center;
      padding-top: 13vh;
    }

    .overlay.open { display: flex; }

    .search-box {
      background: var(--bg-raised);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      width: 100%;
      max-width: 520px;
      overflow: hidden;
      animation: pop 0.18s var(--ease);
    }

    @keyframes pop {
      from { opacity: 0; transform: scale(0.97) translateY(-6px); }
      to { opacity: 1; transform: scale(1) translateY(0); }
    }

    .search-head {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 14px 16px;
      border-bottom: 1px solid var(--border);
    }

    .search-head .i { color: var(--text-muted); font-size: 19px; }

    .search-field {
      flex: 1;
      background: none;
      border: none;
      outline: none;
      font-size: 0.92rem;
      font-family: var(--font-body);
      color: var(--text);
    }

    .search-field::placeholder { color: var(--text-muted); }

    .search-esc {
      font-family: var(--font-body);
      font-size: 0.66rem;
      color: var(--text-muted);
      border: 1px solid var(--border);
      border-radius: 4px;
      padding: 2px 6px;
      cursor: pointer;
      background: none;
    }

    .search-body { max-height: 280px; overflow-y: auto; }

    .search-hint {
      padding: 24px 16px;
      text-align: center;
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .search-item {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 10px 16px;
      cursor: pointer;
      transition: background 0.12s;
      border-left: 2px solid transparent;
    }

    .search-item:hover,
    .search-item.on { background: var(--bg-hover); border-left-color: var(--accent); }
    .search-item .i { color: var(--text-muted); font-size: 17px; flex-shrink: 0; }
    .search-item-info { flex: 1; min-width: 0; }
    .search-item-title { font-size: 0.86rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .search-item-tag { font-size: 0.72rem; color: var(--text-muted); }

    .mob-overlay { display: none; position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,0.4); }
    .mob-overlay.open { display: block; }

    .mob-panel {
      position: absolute;
      right: 0;
      top: 0;
      width: 240px;
      height: 100%;
      background: var(--bg-raised);
      border-left: 1px solid var(--border);
      padding: 20px;
    }

    .mob-close { background: none; border: none; color: var(--text); cursor: pointer; margin-bottom: 20px; }

    .mob-menu {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .mob-menu a {
      display: block;
      padding: 10px 12px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      transition: background 0.2s, color 0.2s;
    }

    .mob-menu a:hover { background: var(--bg-hover); color: var(--text); }

    .hero {
      padding: 96px 28px 72px;
      max-width: var(--max-w);
      margin: 0 auto;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.74rem;
      font-weight: 600;
      color: var(--accent);
      letter-spacing: 0.4px;
      margin-bottom: 20px;
    }

    .eyebrow::before { content: ""; width: 20px; height: 1px; background: var(--accent); }

    .hero h1 {
      font-family: var(--font-display);
      font-size: clamp(2.2rem, 5vw, 3.6rem);
      line-height: 1.1;
      letter-spacing: -1.2px;
      max-width: 640px;
      margin-bottom: 18px;
    }

    .hero h1 em { font-style: italic; color: var(--accent); }

    .hero p {
      font-size: 1rem;
      font-weight: 300;
      color: var(--text-secondary);
      max-width: 480px;
      line-height: 1.75;
      margin-bottom: 32px;
    }

    .hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 10px 20px;
      border-radius: var(--radius);
      font-size: 0.84rem;
      font-weight: 600;
      font-family: var(--font-body);
      cursor: pointer;
      transition: all 0.2s var(--ease);
      border: none;
    }

    .btn .i { font-size: 18px; }
    .btn-p { background: var(--accent); color: #fff; }
    .btn-p:hover { background: var(--accent-hover); transform: translateY(-1px); }
    .btn-g { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
    .btn-g:hover { border-color: var(--border-hover); color: var(--text); background: var(--bg-hover); }

    .sec {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 64px 28px;
    }

    .sec-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
    }

    .sec-label {
      font-size: 0.74rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1.4px;
      color: var(--text-muted);
    }

    .topics-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
      gap: 10px;
    }

    .topic {
      background: var(--bg-raised);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 16px 14px;
      cursor: pointer;
      transition: border-color 0.25s, transform 0.25s, background 0.25s, opacity 0.3s;
    }

    .topic:hover { border-color: var(--border-hover); transform: translateY(-1px); background: var(--bg-hover); }
    .topic.on { border-color: var(--accent); background: var(--accent-subtle); }
    .topic.dim { opacity: 0.25; pointer-events: none; }

    .topic .i { font-size: 20px; color: var(--accent); margin-bottom: 10px; display: block; }
    .topic-name { font-size: 0.84rem; font-weight: 600; margin-bottom: 2px; }
    .topic-count { font-size: 0.7rem; color: var(--text-muted); }

    .filter-bar {
      display: none;
      align-items: center;
      gap: 10px;
      margin-bottom: 20px;
      padding: 10px 16px;
      background: var(--bg-raised);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .filter-bar.on { display: flex; }

    .filter-bar-label {
      font-size: 0.78rem;
      color: var(--text-secondary);
      flex: 1;
    }

    .filter-bar-label strong {
      color: var(--accent);
      font-weight: 600;
    }

    .filter-clear {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 0.76rem;
      font-weight: 500;
      color: var(--text-muted);
      background: var(--bg-subtle);
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 4px 10px;
      cursor: pointer;
      transition: color 0.2s, border-color 0.2s;
      font-family: var(--font-body);
    }

    .filter-clear:hover { color: var(--text); border-color: var(--border-hover); }
    .filter-clear .i { font-size: 14px; }

    .articles-list {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1px;
      background: var(--border);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: border-color 0.35s;
    }

    .card {
      display: grid;
      grid-template-columns: 1fr auto;
      align-items: center;
      gap: 20px;
      padding: 20px 24px;
      background: var(--bg-raised);
      cursor: pointer;
      transition: background 0.15s;
    }

    .card:hover { background: var(--bg-hover); }
    .card-body { min-width: 0; }
    .card-tags { display: flex; gap: 6px; margin-bottom: 6px; }

    .pill {
      font-size: 0.66rem;
      font-weight: 600;
      padding: 2px 7px;
      border-radius: 4px;
      text-transform: uppercase;
      letter-spacing: 0.4px;
    }

    .pill-a { background: var(--accent-medium); color: var(--accent); }

    .card-title {
      font-size: 0.98rem;
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 4px;
      transition: color 0.15s;
    }

    .card:hover .card-title { color: var(--accent); }

    .card-desc {
      font-size: 0.82rem;
      color: var(--text-secondary);
      line-height: 1.6;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .card-meta {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.73rem;
      color: var(--text-muted);
      margin-top: 8px;
    }

    .card-meta span { display: flex; align-items: center; gap: 3px; }
    .card-meta .i { font-size: 13px; }

    .card-arrow {
      color: var(--text-muted);
      transition: color 0.15s, transform 0.15s;
      flex-shrink: 0;
    }

    .card:hover .card-arrow { color: var(--accent); transform: translateX(2px); }

    .no-match {
      padding: 48px 24px;
      text-align: center;
      background: var(--bg-raised);
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    .reader {
      display: none;
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 40px 28px 80px;
    }

    .reader.open { display: block; animation: up 0.3s var(--ease-out); }

    @keyframes up {
      from { opacity: 0; transform: translateY(16px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .reader-top {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 40px;
    }

    .reader-back {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--text-muted);
      cursor: pointer;
      background: none;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 6px 12px;
      transition: color 0.2s, border-color 0.2s;
      font-family: var(--font-body);
    }

    .reader-back:hover { color: var(--accent); border-color: var(--accent); }
    .reader-back .i { font-size: 16px; }

    .reader-head {
      max-width: 680px;
      margin: 0 auto 40px;
    }

    .reader-tag { display: inline-block; margin-bottom: 14px; }

    .reader-title {
      font-family: var(--font-display);
      font-size: clamp(1.7rem, 3.5vw, 2.4rem);
      line-height: 1.15;
      letter-spacing: -0.8px;
      margin-bottom: 16px;
    }

    .reader-meta {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    .reader-meta span { display: flex; align-items: center; gap: 4px; }
    .reader-meta .i { font-size: 14px; }

    .reader-divider {
      max-width: 680px;
      margin: 0 auto;
      height: 1px;
      background: var(--border);
    }

    .reader-content {
      max-width: 680px;
      margin: 0 auto;
      padding-top: 40px;
      font-size: 1rem;
      line-height: 1.9;
      color: var(--text-secondary);
    }

    .reader-content h2 {
      font-family: var(--font-display);
      font-size: 1.45rem;
      color: var(--text);
      margin: 48px 0 18px;
      letter-spacing: -0.4px;
      line-height: 1.25;
    }

    .reader-content h2:first-child { margin-top: 0; }

    .reader-content p { margin-bottom: 22px; }
    .reader-content strong { color: var(--text); font-weight: 600; }

    .reader-content blockquote {
      border-left: 2px solid var(--accent);
      padding: 14px 22px;
      margin: 28px 0;
      background: var(--accent-subtle);
      border-radius: 0 var(--radius) var(--radius) 0;
      font-style: italic;
      color: var(--text);
      font-size: 0.96rem;
      line-height: 1.75;
    }

    .reader-content code {
      background: var(--code-bg);
      padding: 2px 6px;
      border-radius: 4px;
      font-size: 0.86rem;
      border: 1px solid var(--border);
    }

    .reader-content pre {
      background: var(--code-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      overflow-x: auto;
      margin: 28px 0;
      font-size: 0.84rem;
      line-height: 1.7;
    }

    .reader-content pre code { background: none; border: none; padding: 0; font-size: inherit; }
    .reader-content ul, .reader-content ol { margin: 18px 0 22px 24px; }
    .reader-content li { margin-bottom: 10px; line-height: 1.8; }

    .reader-footer {
      max-width: 680px;
      margin: 56px auto 0;
      padding-top: 32px;
      border-top: 1px solid var(--border);
    }

    .reader-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

    .reader-nav-btn {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 16px 18px;
      background: var(--bg-raised);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      cursor: pointer;
      transition: border-color 0.2s, background 0.2s;
      font-family: var(--font-body);
      text-align: left;
      color: var(--text);
    }

    .reader-nav-btn:hover { border-color: var(--border-hover); background: var(--bg-hover); }
    .reader-nav-btn.next { text-align: right; flex-direction: row-reverse; grid-column: 2; }
    .reader-nav-btn.prev { grid-column: 1; }
    .reader-nav-btn.solo-next { grid-column: 2; }
    .reader-nav-btn .i { font-size: 16px; color: var(--text-muted); flex-shrink: 0; }
    .reader-nav-dir { font-size: 0.66rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 3px; }
    .reader-nav-name { font-size: 0.82rem; font-weight: 600; line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }

    .about-inner { display: flex; gap: 36px; align-items: center; }

    .about-avatar {
      flex-shrink: 0;
      width: 96px;
      height: 96px;
      border-radius: 50%;
      background: var(--accent-subtle);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: border-color 0.35s, background 0.35s;
    }

    .about-avatar .i { font-size: 36px; color: var(--accent); }
    .about-name { font-family: var(--font-display); font-size: 1.3rem; margin-bottom: 6px; }
    .about-bio { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.8; max-width: 500px; }
    .about-links { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }

    .about-link {
      display: flex;
      align-items: center;
      gap: 4px;
      font-size: 0.78rem;
      color: var(--text-muted);
      padding: 5px 10px;
      border: 1px solid var(--border);
      border-radius: 8px;
      transition: border-color 0.2s, color 0.2s;
    }

    .about-link:hover { border-color: var(--accent); color: var(--accent); }
    .about-link .i { font-size: 14px; }

    .scroll-top {
      position: fixed;
      bottom: 24px;
      right: 24px;
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--accent);
      border: none;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      opacity: 0;
      pointer-events: none;
      transform: translateY(8px);
      transition: opacity 0.25s, transform 0.25s, background 0.2s;
      z-index: 50;
    }

    .scroll-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
    .scroll-top:hover { background: var(--accent-hover); }
    .scroll-top .i { font-size: 22px; }

    footer {
      border-top: 1px solid var(--border);
      transition: border-color 0.35s;
    }

    .footer-inner {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 24px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.76rem;
      color: var(--text-muted);
    }

    .footer-links { display: flex; gap: 16px; }
    .footer-links a { color: var(--text-muted); transition: color 0.2s; }
    .footer-links a:hover { color: var(--accent); }

    .rv {
      opacity: 0;
      transform: translateY(12px);
      transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
    }

    .rv.v { opacity: 1; transform: translateY(0); }

    @media (max-width: 768px) {
      .nav-links, .search-trigger { display: none; }
      .hamburger { display: block; }
      .hero { padding: 72px 20px 56px; }
      .topics-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
      .card { grid-template-columns: 1fr; gap: 8px; padding: 16px 18px; }
      .card-arrow { display: none; }
      .about-inner { flex-direction: column; text-align: center; }
      .about-links { justify-content: center; }
      .about-bio { max-width: 100%; }
      .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
      .scroll-top { bottom: 16px; right: 16px; width: 38px; height: 38px; }
      .reader { padding: 32px 20px 64px; }
      .reader-nav { grid-template-columns: 1fr; }
      .reader-nav-btn.next { flex-direction: row; text-align: left; grid-column: 1; }
      .reader-nav-btn.solo-next { grid-column: 1; }
      .nav-inner { padding: 0 20px; }
      .sec { padding: 48px 20px; }
    }

    @media (max-width: 480px) {
      .hero-actions { flex-direction: column; }
      .hero-actions .btn { width: 100%; justify-content: center; }
    }