/* Paladii CMS */
    :root {
      --bg-color: #fbfbfd;
      --surface-color: #ffffff;
      --glass-bg: rgba(251, 251, 253, 0.7);
      --glass-border: rgba(0, 0, 0, 0.05);
      --text-main: #1d1d1f;
      --text-secondary: #86868b;
      --accent-color: #0071e3;
      --accent-hover: #0077ed;
      --radius-sm: 12px;
      --radius-md: 20px;
      --radius-lg: 32px;
      --shadow-soft: 0 4px 14px rgba(0,0,0,0.06);
      --shadow-hover: 0 14px 44px rgba(0,0,0,0.12);
      --transit-bounce: cubic-bezier(0.2, 0.8, 0.2, 1.15);
      --transit-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
    }
    
    body.dark-theme {
      --bg-color: #000000;
      --surface-color: #1d1d1f;
      --glass-bg: rgba(28, 28, 30, 0.75);
      --glass-border: rgba(255, 255, 255, 0.1);
      --text-main: #f5f5f7;
      --text-secondary: #a1a1a6;
      --shadow-soft: 0 4px 14px rgba(0,0,0,0.4);
      --shadow-hover: 0 14px 44px rgba(0,0,0,0.6);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; outline: none; }
    html { scroll-behavior: smooth; }
    
    html { overflow-x: clip; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
      background-color: var(--bg-color);
      color: var(--text-main);
      -webkit-font-smoothing: antialiased;
      line-height: 1.4;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    /* GLOBAL ANIMATIONS */
    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(30px) scale(0.98); }
      100% { opacity: 1; transform: translateY(0) scale(1); }
    }
    @keyframes pageEnter {
      from { opacity: 0; }
      to   { opacity: 1; }
    }
    @keyframes pageExit {
      from { opacity: 1; }
      to   { opacity: 0; }
    }
    body { animation: pageEnter 0.28s var(--transit-smooth) both; }
    body.page-exit {
      animation: pageExit 0.16s var(--transit-smooth) both;
      pointer-events: none;
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 0 0 rgba(0,113,227,0.4); }
      70% { box-shadow: 0 0 0 15px rgba(0,113,227,0); }
      100% { box-shadow: 0 0 0 0 rgba(0,113,227,0); }
    }
    
    .interactive { transition: transform 0.15s ease-out; }
    .interactive:active { transform: scale(0.95) !important; }

    /* NAVIGATION */
    nav {
      position: fixed; top: 0; width: 100%; z-index: 100;
      background: var(--bg-color);
      border-bottom: 1px solid var(--glass-border);
      box-shadow: 0 1px 20px rgba(0,0,0,0.06);
      padding: 14px 40px;
      display: flex; justify-content: space-between; align-items: center;
      transform: translateY(-110%);
      transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    nav.nav-visible { transform: translateY(0); }

    .nav-hint {
      position: fixed; top: 0; left: 0;
      width: 100%; height: 22px;
      background: var(--bg-color);
      border-bottom: 1px solid var(--glass-border);
      box-shadow: 0 1px 20px rgba(0,0,0,0.06);
      border-radius: 0;
      z-index: 99;
      opacity: 0;
      transition: opacity 0.4s ease;
      pointer-events: none;
      display: flex; align-items: center; justify-content: center;
    }
    .nav-hint::after {
      content: '';
      width: 48px; height: 2px;
      border-radius: 99px;
      background: var(--text-secondary);
    }
    .nav-hint.visible { opacity: 1; transition-delay: 0.65s; }
    .nav-hint.visible::after { animation: navHintPulse 5s ease-in-out infinite; }
    @keyframes navHintPulse {
      0%, 100% { width: 48px; }
      50%       { width: 72px; }
    }
    body.theme-frost .nav-hint {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: saturate(180%) blur(10px);
      -webkit-backdrop-filter: saturate(180%) blur(10px);
      border-color: rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    body.theme-frost .nav-hint::after { background: rgba(255, 255, 255, 0.45); }
    .brand {
      font-size: 21px; font-weight: 700; color: var(--text-main); text-decoration: none;
      letter-spacing: -0.02em;
    }
    .nav-links { display: flex; gap: 28px; align-items: center; }
    .nav-link { color: var(--text-main); text-decoration: none; font-size: 15px; font-weight: 500; transition: color 0.2s; opacity: 0.75; }
    .nav-link:hover { color: var(--text-main); opacity: 1; }

    
    /* Hero */
    .hero {
      position: relative;
      height: 100vh; min-height: 700px;
      display: flex; flex-direction: column; align-items: center; justify-content: center;
      text-align: center; padding: 0 20px;
      overflow: hidden;
    }

    .hero-card {
      position: relative;
      max-width: 860px; width: 100%;
      animation: fadeUp 0.8s var(--transit-bounce) both;
    }
    body.theme-frost .hero-card {
      padding: 64px 80px;
      border-radius: 32px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      box-shadow: 0 8px 56px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255,255,255,0.08);
      backdrop-filter: blur(16px) saturate(200%) brightness(1.08);
      -webkit-backdrop-filter: blur(16px) saturate(200%) brightness(1.08);
    }
    
    .hero::before {
      content: ''; position: absolute; width: 600px; height: 600px;
      background: radial-gradient(circle, rgba(0,113,227,0.05) 0%, transparent 70%);
      top: 50%; left: 50%; transform: translate(-50%, -50%);
      z-index: -1; animation: fadeUp 1.5s ease-out;
    }

    .hero-title {
      font-size: clamp(36px, 10vw, 84px);
      font-weight: 700; letter-spacing: -0.04em;
      margin-bottom: 20px; color: var(--text-main);
      animation: fadeUp 0.8s var(--transit-bounce) both;
    }
    .dot {
      color: #ff3b30;
    }
    .hero-subtitle {
      font-size: clamp(20px, 3vw, 28px);
      font-weight: 400; color: var(--text-secondary);
      max-width: 600px; margin: 0 auto 40px;
      letter-spacing: -0.01em;
      animation: fadeUp 0.8s var(--transit-bounce) 0.1s both;
    }

    .hero-cta {
      display: inline-flex; align-items: center; gap: 10px;
      background: var(--accent-color); color: #fff;
      padding: 16px 36px; border-radius: 40px;
      font-size: 18px; font-weight: 500; text-decoration: none;
      box-shadow: 0 10px 20px rgba(0,113,227,0.3);
      animation: fadeUp 0.8s var(--transit-bounce) 0.2s both, pulseGlow 3s infinite;
      transition: all 0.3s var(--transit-smooth);
    }
    .hero-cta:hover {
      background: var(--accent-hover);
      box-shadow: 0 12px 30px rgba(0,113,227,0.4);
      transform: translateY(-2px);
    }

    /* Scroll Indicator */
    @keyframes floatPulsate {
      0%, 100% { transform: translateY(0); opacity: 0.5; }
      50% { transform: translateY(10px); opacity: 0.9; }
    }
    .scroll-indicator {
      position: absolute; bottom: 40px; left: 0; right: 0; margin: 0 auto; width: 44px;
      color: var(--text-secondary); opacity: 0.5;
      animation: fadeUp 0.8s 0.6s both, floatPulsate 2.5s ease-in-out 1.4s infinite;
      text-decoration: none;
      cursor: pointer;
      padding: 10px;
      display: flex; justify-content: center;
      transition: color 0.2s;
      will-change: opacity;
    }
    .scroll-indicator:hover {
      opacity: 1;
      color: var(--text-main);
    }

    /* Library */
    .library-section {
      padding: 100px 20px;
      max-width: 1200px;
      margin: 0 auto;
      flex: 1;
      width: 100%;
    }
    .section-header {
      text-align: center; margin-bottom: 60px;
    }
    .section-header h2 {
      font-size: 42px; font-weight: 700; letter-spacing: -0.03em; margin-bottom: 16px;
    }

    /* Search & Filters */
    .controls {
      display: flex; flex-direction: column; align-items: center; gap: 0;
      margin-bottom: 28px;
      width: 100%;
    }
    .search-wrapper {
      position: relative; width: 100%;
      transition: transform 0.3s var(--transit-bounce);
    }
    .search-wrapper:hover { transform: translateY(-2px); }

    .filter-toggle {
      position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
      background: none; border: none; cursor: pointer;
      color: var(--text-secondary); padding: 8px;
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      transition: color 0.2s, background 0.2s, transform 0.2s;
    }
    .filter-toggle:hover { color: var(--text-main); background: rgba(0,0,0,0.05); }
    .filter-toggle.active { color: var(--accent-color); background: rgba(0,113,227,0.08); }
    body.theme-frost .filter-toggle { color: var(--text-secondary); }
    body.theme-frost .filter-toggle:hover { background: rgba(255,255,255,0.1); color: #fff; }
    body.theme-frost .filter-toggle.active { color: #4da3ff; background: rgba(77,163,255,0.15); }

    .filters {
      display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
      padding-top: 0;
      opacity: 0;
      max-height: 0;
      overflow: hidden;
      transform: translateY(-8px);
      pointer-events: none;
      margin-top: 0;
      transition: opacity 0.3s ease, transform 0.3s ease, max-height 0.35s ease, margin-top 0.3s ease, padding-top 0.3s ease;
    }
    .filters.open {
      opacity: 1;
      max-height: 200px;
      overflow: visible;
      transform: translateY(0);
      pointer-events: auto;
      margin-top: 10px;
      padding-top: 6px;
      transition: opacity 0.3s ease, transform 0.3s ease, max-height 0.35s ease, margin-top 0.3s ease, padding-top 0.3s ease;
    }
    .search-input {
      width: 100%; padding: 22px 64px 22px 60px;
      font-size: 20px; border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg); background: var(--surface-color);
      color: var(--text-main); font-weight: 500;
      box-shadow: var(--shadow-soft);
      transition: all 0.3s var(--transit-smooth);
    }
    .search-input:focus {
      border-color: rgba(0,113,227,0.3);
      box-shadow: 0 0 0 4px rgba(0,113,227,0.1), var(--shadow-hover);
      transform: scale(1.02);
    }
    .search-icon {
      position: absolute; left: 24px; top: 50%; transform: translateY(-50%);
      width: 22px; height: 22px; color: var(--text-secondary);
      pointer-events: none; transition: color 0.3s, transform 0.3s var(--transit-smooth), opacity 0.3s;
    }
    .search-input:focus + .search-icon {
      color: var(--accent-color);
      transform: translateY(-50%) translateX(-6px) scale(1.18);
      opacity: 1;
    }

    .filter-btn {
      padding: 10px 22px; border-radius: 40px; border: 1px solid var(--glass-border);
      background: rgba(255,255,255,0.5); color: var(--text-main);
      font-size: 15px; font-weight: 500; cursor: pointer;
      backdrop-filter: blur(6px);
      transition: all 0.2s;
    }
    .filter-btn:hover { background: var(--surface-color); border-color: rgba(0,0,0,0.15); transform: translateY(-2px); }
    .filter-btn.active { background: var(--text-main); color: #fff; border-color: var(--text-main); }

    /* Grid Layout */
    .grid {
      display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 30px; align-items: start;
    }
    
    .card {
      background: var(--surface-color); border-radius: var(--radius-md);
      padding: 30px; display: flex; flex-direction: column;
      border: 1px solid rgba(0,0,0,0.04);
      box-shadow: var(--shadow-soft);
      transition: all 0.4s var(--transit-bounce);
      position: relative;
    }
    .unread-dot {
      position: absolute; top: 14px; right: 14px;
      width: 8px; height: 8px;
      background-color: #ff3b30;
      border-radius: 50%;
      z-index: 10;
      transition: opacity 0.25s ease, transform 0.25s ease;
    }
    .card.expanded .unread-dot {
      opacity: 0;
      transform: scale(0.5);
    }
    body.dark-theme .card { border-color: rgba(255,255,255,0.05); }
    .card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,0,0,0.08);
    }
    body.dark-theme .card:hover { border-color: rgba(255,255,255,0.1); }
    .card-category {
      font-size: 12px; font-weight: 700; text-transform: uppercase;
      letter-spacing: 0.08em; color: var(--text-secondary); margin-bottom: 12px;
    }
    .card-title {
      font-size: 22px; font-weight: 600; color: var(--text-main);
      letter-spacing: -0.015em; margin-bottom: 30px; line-height: 1.3;
    }
    .card-title + .card-desc {
      margin-top: -15px;
    }
    .card-desc {
      position: relative;
      margin-bottom: 20px;
      font-size: 14px; color: var(--text-secondary); line-height: 1.5;
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
    }
    .card-desc .preview-text {
      position: absolute; top: 0; left: 0; width: 100%;
      opacity: 1; 
      transition: opacity 0.3s ease, transform 0.3s ease;
      transition-delay: 0s;
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
      pointer-events: auto;
    }
    .card-desc .full-text {
      opacity: 0; pointer-events: none; margin: 0;
      max-height: 1.5em; overflow: hidden;
      transform: translateY(-4px);
      transition: max-height 0.4s ease, opacity 0.3s ease, transform 0.3s ease;
      transition-delay: 0s;
    }
    .card:hover .card-desc .full-text,
    .card:focus-within .card-desc .full-text {
      max-height: 200px;
      opacity: 1; pointer-events: auto;
      transform: translateY(0);
      transition: max-height 0.6s ease-in-out, opacity 0.4s ease-in-out, transform 0.4s ease-in-out;
      transition-delay: 0.15s;
    }
    .card:hover .card-desc .preview-text,
    .card:focus-within .card-desc .preview-text {
      opacity: 0; pointer-events: none;
      transform: translateY(-4px);
      transition: opacity 0.4s ease-in-out, transform 0.4s ease-in-out;
      transition-delay: 0.15s;
    }

    .card-thumb {
      position: relative;
      width: 100%;
      max-height: 0;
      overflow: hidden;
      border-radius: 10px;
      margin-bottom: 0;
      opacity: 0;
      transition: max-height 0.45s var(--transit-bounce), opacity 0.35s ease, margin-bottom 0.45s var(--transit-bounce);
      background: var(--bg-color);
      display: flex; align-items: center; justify-content: center;
    }
    .card-thumb-canvas {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 8px;
    }
    .card-thumb-loader {
      position: absolute;
      width: 18px; height: 18px;
      border: 2px solid var(--glass-border);
      border-top-color: var(--accent-color);
      border-radius: 50%;
      animation: spin 0.75s linear infinite;
      opacity: 1;
      transition: opacity 0.2s;
    }
    .card-thumb.loaded .card-thumb-loader { opacity: 0; pointer-events: none; }
    @keyframes spin { to { transform: rotate(360deg); } }
    @media (hover: hover) and (pointer: fine) {
      .card:hover .card-thumb {
        max-height: 220px;
        opacity: 1;
        margin-bottom: 16px;
        transition: max-height 0.5s var(--transit-bounce), opacity 0.4s ease 0.1s, margin-bottom 0.5s var(--transit-bounce);
      }
      .card:hover .unread-dot {
        opacity: 0;
        transform: scale(0.5);
      }
    }

    /* Mobile / touch: compact cards, tap to expand thumbnail + description */
    @media (hover: none) {
      .controls { margin-bottom: 16px; }
      .section-header { margin-bottom: 28px; }
      .grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
        align-items: start;
      }
      .card {
        display: flex;
        flex-direction: column;
        padding: 14px;
        cursor: pointer;
        -webkit-tap-highlight-color: transparent;
        user-select: none;
      }
      .card::after { display: none; }
      .card.expanded {
        border-color: rgba(0,0,0,0.1);
        box-shadow: var(--shadow-hover);
      }
      body.dark-theme .card.expanded { border-color: rgba(255,255,255,0.12); }
      /* Thumbnail hidden by default, slides in on expand */
      .card-thumb {
        position: static;
        inset: auto;
        width: 100%;
        height: auto;
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        border-radius: 8px;
        margin-bottom: 0;
        background: var(--bg-color);
        transition: max-height 0.42s var(--transit-bounce), opacity 0.3s ease, margin-bottom 0.38s var(--transit-bounce);
        display: flex; align-items: center; justify-content: center;
      }
      .card-thumb-canvas {
        position: static;
        min-width: unset; min-height: unset;
        top: auto; left: auto; transform: none;
        width: 100%; height: auto;
        border-radius: 6px;
      }
      .card-thumb.loaded { background: transparent; }
      .card.expanded .card-thumb {
        max-height: 260px;
        opacity: 1;
        margin-bottom: 12px;
        transition: max-height 0.5s var(--transit-bounce), opacity 0.35s ease 0.05s, margin-bottom 0.45s var(--transit-bounce);
      }
      /* Restore normal text styles */
      .card-category {
        position: static;
        font-size: 11px;
        color: var(--text-secondary);
        background: none;
        padding: 0;
        border-radius: 0;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        margin-bottom: 8px;
      }
      .card-title {
        position: static;
        font-size: 15px;
        font-weight: 600;
        color: var(--text-main);
        text-shadow: none;
        display: block;
        -webkit-line-clamp: unset;
        margin-bottom: 6px;
        line-height: 1.3;
      }
      .card-title + .card-desc { margin-top: 0; }
      /* Description hidden, fades in on expand */
      .card-desc {
        display: block;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        margin-bottom: 0;
        transition: max-height 0.38s ease, opacity 0.28s ease, margin-bottom 0.35s ease;
      }
      .card.expanded .card-desc {
        max-height: 200px;
        opacity: 1;
        margin-bottom: 10px;
      }
      .card-desc .preview-text { display: none; }
      .card.expanded .card-desc .full-text {
        max-height: 200px;
        opacity: 1;
        transform: none;
        pointer-events: auto;
      }
      .card-actions {
        position: static;
        margin-top: auto;
        display: flex;
        gap: 6px;
      }
      .btn-sm { padding: 5px 11px; gap: 5px; }
      .btn-label { max-width: 80px; opacity: 1; margin-left: 0; }
      .card-doc-icon {
        display: flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        top: 50%;
        right: 14px;
        transform: translateY(-50%);
        color: var(--text-secondary);
        opacity: 0.45;
        pointer-events: none;
        transition: opacity 0.2s ease, transform 0.2s ease;
      }
      .card.expanded .card-doc-icon {
        opacity: 0;
        transform: translateY(-50%) scale(0.7);
        pointer-events: none;
      }
    }
    .card-doc-icon { display: none; }
    @media (hover: none) and (min-width: 580px) {
      .grid { grid-template-columns: repeat(3, 1fr); }
    }
    /* 1 column on very small screens */
    @media (hover: none) and (max-width: 299px) {
      .grid { grid-template-columns: 1fr; }
    }

    .btn-sm {
      display: inline-flex; align-items: center; justify-content: center; gap: 0;
      padding: 6px 8px; border-radius: 980px; font-size: 12px; font-weight: 500;
      text-decoration: none; cursor: pointer; border: none; letter-spacing: -0.01em;
      transition: padding 0.28s var(--transit-bounce), gap 0.28s var(--transit-bounce), background 0.18s;
      white-space: nowrap; overflow: hidden;
    }
    .btn-sm svg { flex-shrink: 0; }
    .btn-label {
      display: inline-block;
      max-width: 0;
      overflow: hidden;
      opacity: 0;
      transition: max-width 0.28s var(--transit-bounce), opacity 0.2s ease, margin-left 0.28s var(--transit-bounce);
      margin-left: 0;
    }
    .card-actions { margin-top: auto; display: flex; gap: 8px; pointer-events: none; justify-content: flex-end; }
    .card-actions > * { pointer-events: auto; }
    .btn-read { background: rgba(0,0,0,0.06); color: var(--text-main); }
    body.dark-theme .btn-read { background: rgba(255,255,255,0.1); }
    .btn-read:hover { background: rgba(0,0,0,0.1); }
    body.dark-theme .btn-read:hover { background: rgba(255,255,255,0.16); }
    .btn-dl { background: rgba(0,113,227,0.08); color: var(--accent-color); }
    body.dark-theme .btn-dl { background: rgba(0,113,227,0.2); color: #47a1ff; }
    .btn-dl:hover { background: rgba(0,113,227,0.14); }
    body.dark-theme .btn-dl:hover { background: rgba(0,113,227,0.3); }
    body.theme-frost .btn-read { background: rgba(255,255,255,0.1); color: var(--text-main); }
    body.theme-frost .btn-read:hover { background: rgba(255,255,255,0.17); }
    body.theme-frost .btn-dl { background: rgba(77,163,255,0.12); color: #4da3ff; }
    body.theme-frost .btn-dl:hover { background: rgba(77,163,255,0.2); }
    @media (hover: hover) and (pointer: fine) {
      .card:hover .btn-sm, .card:focus-within .btn-sm {
        padding: 5px 11px;
        gap: 5px;
      }
      .card:hover .btn-label, .card:focus-within .btn-label {
        max-width: 80px;
        opacity: 1;
        margin-left: 0;
        transition: max-width 0.32s var(--transit-bounce), opacity 0.25s ease 0.05s, margin-left 0.28s var(--transit-bounce);
      }
    }

    .no-results {
      grid-column: 1 / -1; text-align: center; padding: 80px 20px;
      color: var(--text-secondary); font-size: 20px; display: none;
    }

    /* Load more button */
    .load-more-btn {
      padding: 14px 40px;
      border-radius: 40px;
      border: 1px solid var(--glass-border);
      background: var(--surface-color);
      color: var(--text-main);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: var(--shadow-soft);
      transition: all 0.25s var(--transit-bounce);
    }
    .load-more-btn:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,0,0,0.12);
    }
    body.theme-frost .load-more-btn {
      background: rgba(255,255,255,0.07);
      border-color: rgba(255,255,255,0.15);
      color: var(--text-main);
    }
    body.theme-frost .load-more-btn:hover {
      background: rgba(255,255,255,0.12);
    }

    footer { 
      padding: 28px 20px; color: var(--text-secondary); font-size: 13px; margin-top: auto; 
      border-top: 1px solid var(--glass-border); width: 100%;
    }
    .footer-content { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto 14px; gap: 12px; }
    .footer-links { display: flex; gap: 18px; font-weight: 500; }
    .footer-links a { color: var(--text-secondary); text-decoration: none; transition: color 0.2s; }
    .footer-links a:hover { color: var(--text-main); }
    .footer-bottom { text-align: center; max-width: 1200px; margin: 0 auto; color: #a1a1a6; }

    
    /* Reader */
    .reader {
      display: flex; flex-direction: column; height: 100vh;
      background: #e5e5ea;
      transition: background-color 0.3s ease;
      overflow: hidden;
    }
    body.dark-theme .reader {
      background: #1c1c1e;
    }
    
    .reader.warm-mode::after {
      content: '';
      position: fixed; inset: 0;
      background: rgba(255, 170, 0, 0.08);
      pointer-events: none;
      z-index: 9999;
      mix-blend-mode: multiply;
      transition: opacity 0.3s ease;
    }
    .reader-bar {
      position: absolute; top: 0; left: 0; right: 0;
      padding: 14px 30px; background: var(--glass-bg);
      backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
      display: flex; justify-content: space-between; align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.05); z-index: 10;
      transition: transform 0.5s var(--transit-bounce), opacity 0.5s var(--transit-smooth);
    }
    .reader-bar.hide {
      transform: translateY(-100%);
      opacity: 0;
    }
    .reader-title { font-weight: 600; font-size: 15px; color: var(--text-main); letter-spacing: 0.02em; }
    .reader-actions { display: flex; gap: 16px; }
    .reader-btn {
      color: var(--text-main); text-decoration: none; font-size: 14px; font-weight: 500;
      padding: 8px 16px; border-radius: 20px; background: rgba(0,0,0,0.05);
      transition: background 0.2s; border: none; cursor: pointer;
    }
    body.dark-theme .reader-btn { background: rgba(255,255,255,0.1); }
    .reader-btn:hover { background: rgba(0,0,0,0.1); }
    body.dark-theme .reader-btn:hover { background: rgba(255,255,255,0.2); }
    
    .pdf-workspace {
      flex: 1; overflow: auto; text-align: center; padding: 80px 20px 120px;
    }
    .pdf-canvas {
      background: #fff; box-shadow: 0 10px 40px rgba(0,0,0,0.08);
      border-radius: 4px;
      position: relative; z-index: 2;
      transition: transform 0.2s ease, opacity 0.2s ease;
      display: inline-block;
      vertical-align: top;
    }
    .pdf-canvas.page-changing { opacity: 0; }
    
    /* Transparent click zones for next/prev on desktop */
    .nav-zone {
      position: fixed; top: 0; bottom: 0; width: 30vw; z-index: 5;
      display: flex; align-items: center;
    }
    @media (hover: none) and (pointer: coarse) {
      .nav-zone { pointer-events: none; }
    }
    .nav-zone-left { left: 0; justify-content: flex-start; padding-left: 30px; }
    .nav-zone-right { right: 20px; justify-content: flex-end; padding-right: 15px; }
    
    .nav-arrow {
      width: 44px; height: 44px;
      fill: none; stroke: var(--text-main); stroke-width: 2.5;
      stroke-linecap: round; stroke-linejoin: round;
      opacity: 0; /* Fully hidden by default */
      transition: opacity 0.1s linear;
      pointer-events: none;
      animation: navPulse 2s infinite ease-in-out;
      background: rgba(255,255,255,0.8);
      backdrop-filter: saturate(180%) blur(10px);
      -webkit-backdrop-filter: saturate(180%) blur(10px);
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 4px 14px rgba(0,0,0,0.1);
      border: 1px solid rgba(0,0,0,0.05);
    }
    body.dark-theme .nav-arrow {
      stroke: #f5f5f7; 
      background: rgba(28, 28, 30, 0.8);
      border-color: rgba(255,255,255,0.1);
      box-shadow: 0 4px 14px rgba(0,0,0,0.4);
    }
    @keyframes navPulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.15); }
    }
    
    .pdf-controls {
      position: fixed; bottom: 30px; left: 0; right: 0; margin: 0 auto; width: max-content;
      max-width: calc(100vw - 40px);
      display: flex; align-items: center; justify-content: center; gap: 4px;
      background: var(--glass-bg); backdrop-filter: saturate(180%) blur(12px);
      -webkit-backdrop-filter: saturate(180%) blur(12px);
      padding: 8px 16px; border-radius: 40px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.1); border: 1px solid rgba(0,0,0,0.05);
      z-index: 1000;
      white-space: nowrap;
      transition: transform 0.5s var(--transit-bounce), opacity 0.5s var(--transit-smooth);
    }
    .pdf-controls.hide {
      transform: translateY(150px);
      opacity: 0;
      pointer-events: none;
    }

    /* Small pill indicator when controls are hidden */
    .controls-restore {
      position: fixed; bottom: 30px; right: 30px;
      background: var(--glass-bg); backdrop-filter: saturate(180%) blur(12px);
      -webkit-backdrop-filter: saturate(180%) blur(12px);
      width: 44px; height: 44px; border-radius: 50%; cursor: pointer;
      box-shadow: 0 10px 30px rgba(0,0,0,0.15); border: 1px solid rgba(0,0,0,0.05);
      z-index: 999; color: var(--text-main); fill: currentColor;
      display: flex; align-items: center; justify-content: center;
      opacity: 0; pointer-events: none; transition: all 0.4s var(--transit-bounce);
      transform: translateY(20px) scale(0.9);
    }
    .controls-restore.show {
      opacity: 1; pointer-events: auto; transform: translateY(0) scale(1);
    }
    .controls-restore:hover {
      background: #fff; color: #111; fill: #111; transform: scale(1.05);
    }
    .pdf-controls button {
      background: transparent; border: none; color: var(--text-main);
      font-size: 13px; font-weight: 500; cursor: pointer;
      padding: 6px 12px; border-radius: 20px; transition: all 0.2s;
    }
    .pdf-controls button:hover { background: rgba(0,0,0,0.06); }
    body.dark-theme .pdf-controls button:hover { background: rgba(255,255,255,0.15); }
    .pdf-controls button:disabled { opacity: 0.3; cursor: not-allowed; }
    .pdf-controls .page-info {
      font-size: 13px; font-weight: 500; color: var(--text-main); padding: 0 4px; display: flex; align-items: center; justify-content: center; gap: 4px;
    }
    .pdf-controls input[type="number"] {
      width: 36px; padding: 4px 0; text-align: center; font-size: 13px; font-weight: 600;
      font-family: inherit; color: var(--text-main); background: rgba(0,0,0,0.06);
      border: 1px solid transparent; border-radius: 6px; outline: none; transition: all 0.2s;
      -moz-appearance: textfield;
    }
    body.dark-theme .pdf-controls input[type="number"] { background: rgba(255,255,255,0.1); }
    .pdf-controls input[type="number"]::-webkit-outer-spin-button,
    .pdf-controls input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
    .pdf-controls input[type="number"]:focus {
      background: var(--surface-color); border-color: rgba(0,113,227,0.4); box-shadow: 0 0 0 2px rgba(0,113,227,0.15);
    }
    .pdf-controls .separator { width: 1px; height: 14px; background: rgba(0,0,0,0.1); margin: 0 4px; }
    body.dark-theme .pdf-controls .separator { background: rgba(255,255,255,0.15); }
    
    @media (max-width: 600px) {
      .reader-bar { padding: 10px 15px; }
      .reader-title { font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 120px; }
      .reader-btn { font-size: 12px; padding: 6px 10px; }
      .pdf-workspace { padding: 58px 10px 100px; }
      
      .pdf-controls {
        padding: 6px 10px; bottom: 20px; gap: 2px;
      }
      .pdf-controls button {
        font-size: 12px; padding: 6px 8px;
      }
      .pdf-controls .page-info {
        font-size: 12px; padding: 0 4px; min-width: auto;
      }
      .pdf-controls .separator { margin: 0 2px; }
    }
.social-links { display: flex; gap: 16px; margin-top: 10px; }
.social-links a { display: flex; align-items: center; justify-content: center; color: var(--text-secondary); transition: color 0.2s, transform 0.2s; }
.social-links a:hover { color: var(--text-main); transform: scale(1.1); }

/* Contact */

.contact-container {
  max-width: 540px;
  margin: 100px auto 120px;
  padding: 0 32px;
  text-align: center;
  flex: 1;
  animation: fadeUp 0.8s var(--transit-smooth) both;
}

.contact-container .title {
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 700;
  letter-spacing: -0.045em;
  margin-bottom: 16px;
  color: var(--text-main);
  line-height: 1.05;
}

.contact-container .subtitle {
  font-size: 21px;
  color: var(--text-secondary);
  font-weight: 400;
  line-height: 1.4;
  margin-bottom: 56px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
  letter-spacing: -0.01em;
}

.contact-form {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  border: 1px solid var(--glass-border);
  padding: 48px;
  border-radius: 28px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.04);
  text-align: left;
  transition: all 0.4s var(--transit-smooth);
}

body.dark-theme .contact-form {
  background: rgba(30, 30, 32, 0.6);
  box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}

.form-group {
  margin-bottom: 28px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-main);
  opacity: 0.8;
  letter-spacing: -0.01em;
}

.form-group input, .form-group textarea {
  width: 100%;
  padding: 16px 20px;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.08);
  background: rgba(0, 0, 0, 0.02);
  color: var(--text-main);
  font-family: inherit;
  font-size: 17px;
  transition: all 0.3s ease;
  box-sizing: border-box;
}

body.dark-theme .form-group input, 
body.dark-theme .form-group textarea {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255,255,255,0.05);
  color: #fff;
}

.form-group input::placeholder, .form-group textarea::placeholder {
  color: #86868b;
  font-weight: 400;
}

.form-group textarea {
  min-height: 160px;
  resize: vertical;
}

.form-group input:focus, .form-group textarea:focus {
  background: var(--surface-color);
  border-color: rgba(0, 113, 227, 0.5);
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.15);
  outline: none;
}

body.dark-theme .form-group input:focus, 
body.dark-theme .form-group textarea:focus {
  background: #1c1c1e;
}

.btn-submit {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 18px 32px;
  background: var(--text-main);
  color: var(--bg-color);
  border: none;
  border-radius: 16px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.4s var(--transit-bounce);
  text-decoration: none;
  text-align: center;
  letter-spacing: -0.015em;
  margin-top: 8px;
}

body.dark-theme .btn-submit {
  background: #f5f5f7;
  color: #1d1d1f;
}

.btn-submit:hover {
  transform: scale(1.02);
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

body.dark-theme .btn-submit:hover {
  box-shadow: 0 10px 20px rgba(255,255,255,0.1);
}

.btn-submit:active {
  transform: scale(0.98);
}


@media (max-width: 600px) {
  .contact-form { padding: 32px 24px; }
  .contact-container { padding: 0 20px; }
}

@media (max-width: 400px) {
  .grid { grid-template-columns: 1fr; }
}

.reader-page-info {
  position: absolute; left: 50%; transform: translateX(-50%); font-size: 14px; font-weight: 500; color: var(--text-main);
}
@media (max-width: 600px) {
  .reader-page-info { font-size: 12px; }
}
@media (max-width: 450px) {
  .reader-page-info { display: none; } /* Hide on very small screens to avoid overlap */
}

@media (max-width: 600px) {
  nav { padding: 8px 14px; }
  .hero { min-height: 500px; padding: 0 20px; }
  .library-section { padding: 80px 20px; }
  .controls { margin-bottom: 32px; }
}

.error-container {
  max-width: 540px; margin: 160px auto 120px; padding: 0 32px; text-align: center; flex: 1;
  animation: fadeUp 0.8s var(--transit-smooth) both;
}
.error-container .title {
  font-size: clamp(60px, 12vw, 120px); font-weight: 700; margin-bottom: 16px; color: var(--text-main);
}
.error-container .subtitle { font-size: 21px; color: var(--text-secondary); margin-bottom: 40px; }

@media (max-width: 600px) {
  .pdf-controls {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    justify-content: flex-start;
  }
  .pdf-controls::-webkit-scrollbar { display: none; }
  .pdf-controls { -ms-overflow-style: none; scrollbar-width: none; }
}

/* Frost – Blobs */
.frost-blobs {
  display: none;
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}
body.theme-frost .frost-blobs {
  display: block;
}
.frost-blob {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 50%;
  filter: blur(12px);
  opacity: 0.55;
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform;
}
.frost-blob svg {
  width: 60%;
  height: 60%;
  color: rgba(255, 255, 255, 0.4);
  animation: floatRotate 30s linear infinite;
}
@keyframes floatRotate {
  0% { transform: rotate(-15deg) scale(1); }
  33% { transform: rotate(5deg) scale(1.1); }
  66% { transform: rotate(-25deg) scale(0.95); }
  100% { transform: rotate(-15deg) scale(1); }
}
.frost-blob-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #f59e0b 0%, #b45309 60%, transparent 100%);
}
.frost-blob-2 {
  width: 420px; height: 420px;
  background: radial-gradient(circle, #8b5cf6 0%, #6d28d9 60%, transparent 100%);
}
.frost-blob-3 {
  width: 360px; height: 360px;
  background: radial-gradient(circle, #10b981 0%, #065f46 60%, transparent 100%);
}
.frost-blob-4 {
  width: 280px; height: 280px;
  background: radial-gradient(circle, #ec4899 0%, #be185d 60%, transparent 100%);
}
.frost-blob-5 {
  width: 240px; height: 240px;
  background: radial-gradient(circle, #22c55e 0%, #15803d 60%, transparent 100%);
}

/* Frost Theme */
body.theme-frost {
  --bg-color: #07080f;
  --surface-color: rgba(255, 255, 255, 0.06);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.12);
  --text-main: #f0f0f5;
  --text-secondary: #c0c0d0;
  --shadow-soft: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-hover: 0 14px 44px rgba(0,0,0,0.7);
  --accent-color: #4da3ff;
  --accent-hover: #70b8ff;
}
body.theme-frost::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: #07080f;
}
body.theme-frost nav {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
body.theme-frost .brand { color: #ffffff; }
body.theme-frost .nav-link { color: rgba(255, 255, 255, 0.88); opacity: 1; }
body.theme-frost .nav-link:hover { color: #ffffff; opacity: 1; }
body.theme-frost .card {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.09) 0%,
    rgba(255, 255, 255, 0.04) 100%
  );
  backdrop-filter: blur(16px) saturate(200%) brightness(1.1);
  -webkit-backdrop-filter: blur(16px) saturate(200%) brightness(1.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(255, 255, 255, 0.04);
}
body.theme-frost .card:hover {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.14) 0%,
    rgba(255, 255, 255, 0.07) 100%
  );
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow:
    0 8px 40px rgba(0, 0, 0, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    inset 0 -1px 0 rgba(255, 255, 255, 0.06);
}
body.theme-frost .library-section {
  background: transparent;
}
body.theme-frost .filter-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
body.theme-frost .filter-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}
body.theme-frost .filter-btn.active {
  background: rgba(77, 163, 255, 0.25);
  border-color: rgba(77, 163, 255, 0.5);
  color: #fff;
}
body.theme-frost .reader-bar {
  background: rgba(7, 8, 15, 0.88);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #f0f0f5;
}
body.theme-frost .reader-title { color: #f0f0f5; }
body.theme-frost .reader-btn {
  background: rgba(255, 255, 255, 0.1);
  color: #f0f0f5;
}
body.theme-frost .reader-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}
body.theme-frost .pdf-controls {
  background: rgba(7, 8, 15, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}
body.theme-frost .pdf-controls button {
  color: #f0f0f5;
}
body.theme-frost .pdf-controls button:hover {
  background: rgba(255, 255, 255, 0.12);
}
body.theme-frost .pdf-controls .page-info {
  color: #f0f0f5;
}
body.theme-frost .pdf-controls input[type="number"] {
  color: #f0f0f5;
  background: rgba(255, 255, 255, 0.1);
}
body.theme-frost .pdf-controls input[type="number"]:focus {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(77, 163, 255, 0.5);
}
body.theme-frost .pdf-controls .separator {
  background: rgba(255, 255, 255, 0.15);
}
body.theme-frost .controls-restore {
  background: rgba(7, 8, 15, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  color: #f0f0f5;
}
body.theme-frost .controls-restore:hover {
  background: rgba(20, 22, 40, 0.95);
  color: #ffffff;
}
body.theme-frost .nav-arrow {
  stroke: #f0f0f5;
  background: rgba(7, 8, 15, 0.8);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.6);
}
body.theme-frost .search-input {
  color: #f0f0f5;
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.14);
}
body.theme-frost .search-input::placeholder {
  color: rgba(240, 240, 245, 0.5);
}
body.theme-frost .search-input:focus {
  border-color: rgba(255, 255, 255, 0.45);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.08), var(--shadow-hover);
}
body.theme-frost .search-input:focus + .search-icon {
  color: #ffffff;
}
body.theme-frost .filter-btn {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #c0c0d0;
  backdrop-filter: blur(10px) saturate(160%);
  -webkit-backdrop-filter: blur(10px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.12), 0 2px 8px rgba(0,0,0,0.3);
}
body.theme-frost .filter-btn:hover {
  background: rgba(255, 255, 255, 0.13);
  border-color: rgba(255, 255, 255, 0.28);
  color: #f0f0f5;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.2), 0 4px 16px rgba(0,0,0,0.4);
}
body.theme-frost .filter-btn.active {
  background: rgba(37, 99, 235, 0.6);
  border-color: rgba(59, 130, 246, 0.7);
  color: #fff;
  backdrop-filter: blur(10px) saturate(160%);
  -webkit-backdrop-filter: blur(10px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.2), 0 4px 16px rgba(37,99,235,0.4);
}
body.theme-frost .section-header h2 {
  color: #f0f0f5;
}
body.theme-frost .btn-read {
  background: #ffffff;
  color: #0d0f1a;
}
body.theme-frost .btn-read:hover {
  background: #e8e8f0;
  color: #0d0f1a;
}
body.theme-frost .btn-dl {
  background: var(--accent-color);
  color: #fff;
}
body.theme-frost .btn-dl:hover {
  background: var(--accent-hover);
}
body.theme-frost .footer-bottom {
  color: var(--text-secondary);
}

/* ─── Mobile nav – always visible ──────────────────────── */
@media (max-width: 960px) {
  nav {
    transform: none !important;
    transition: none;
    padding: 10px 16px;
  }
  .nav-hint { display: none !important; }
  .brand { font-size: 17px; }
  .nav-links { gap: 18px; }
  .nav-link { font-size: 13px; }
}