@import 'generative-ai-light.css';
@import './writing-matrix.css';

:root {
      --bg-primary: #0b0f19;
      --bg-card: rgba(18, 26, 43, 0.85);
      --bg-glass: rgba(255, 255, 255, 0.03);
      --border-color: rgba(255, 255, 255, 0.08);
      --accent-cyan: #06b6d4;
      --accent-blue: #3b82f6;
      --accent-emerald: #10b981;
      --accent-purple: #8b5cf6;
      --accent-amber: #f59e0b;
      --accent-rose: #f43f5e;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }

    :root[data-theme="light"], html:not(.dark) {
      --bg-primary: #f8fafc;
      --bg-card: #ffffff;
      --bg-glass: rgba(0, 0, 0, 0.02);
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #64748b;
    }

    :root[data-theme="light"] .card-title, html:not(.dark) .card-title {
      color: var(--text-main);
    }
    :root[data-theme="light"] .hero-title, html:not(.dark) .hero-title {
      background: linear-gradient(to right, #0f172a, #475569);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    :root[data-theme="light"] .chip, html:not(.dark) .chip {
      background: rgba(0, 0, 0, 0.05);
      border-color: rgba(0, 0, 0, 0.08);
      color: #334155;
    }
    :root[data-theme="light"] .badge-meta, html:not(.dark) .badge-meta {
      background: rgba(0, 0, 0, 0.05);
      color: var(--text-muted);
    }
    :root[data-theme="light"] .tab-btn, html:not(.dark) .tab-btn {
      background: rgba(0, 0, 0, 0.04);
      color: var(--text-muted);
    }
    :root[data-theme="light"] .tab-btn:hover, html:not(.dark) .tab-btn:hover {
      background: rgba(0, 0, 0, 0.08);
      color: var(--text-main);
    }
    :root[data-theme="light"] .tab-btn.active, html:not(.dark) .tab-btn.active {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(59, 130, 246, 0.15));
      border-color: var(--accent-cyan);
      color: #0284c7;
    }

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

    body {
      background-color: var(--bg-primary);
      background-image: 
        radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.12) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.12) 0px, transparent 50%);
      background-attachment: fixed;
      font-family: 'Be Vietnam Pro', 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: var(--text-main);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    :root[data-theme="light"] body, html:not(.dark) body {
      background-image: 
        radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.06) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.06) 0px, transparent 50%);
    }

    /* NAV */
    .navbar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.25rem 2.5rem;
      background: rgba(11, 15, 25, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    :root[data-theme="light"] .navbar, html:not(.dark) .navbar {
      background: rgba(255, 255, 255, 0.88);
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
      text-decoration: none;
    }
    :root[data-theme="light"] .nav-brand, html:not(.dark) .nav-brand {
      color: #0f172a;
    }
    .nav-brand i {
      color: var(--accent-cyan);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .nav-link {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
    }
    .nav-btn {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 0.5rem 1rem;
      border-radius: 8px;
      font-size: 0.85rem;
      font-weight: 600;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      transition: all 0.2s;
    }
    .nav-btn:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: var(--accent-cyan);
    }

    /* CONTAINER */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 2.5rem 1.5rem 5rem 1.5rem;
      flex: 1;
      width: 100%;
    }

    /* HERO */
    .hero-section {
      text-align: center;
      margin-bottom: 2.5rem;
      background: transparent !important;
      border: none !important;
      box-shadow: none !important;
      backdrop-filter: none !important;
      -webkit-backdrop-filter: none !important;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.4rem 1rem;
      border-radius: 9999px;
      background: rgba(6, 182, 212, 0.1);
      border: 1px solid rgba(6, 182, 212, 0.25);
      color: var(--accent-cyan);
      font-size: 0.82rem;
      font-weight: 600;
      margin-bottom: 1.25rem;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 1rem;
      background: linear-gradient(to right, #f8fafc, #94a3b8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto;
      font-size: 1.05rem;
      line-height: 1.6;
    }

    /* TABS */
    .tab-bar {
      display: flex;
      justify-content: center;
      gap: 1rem;
      margin-bottom: 2rem;
    }
    .tab-btn {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      padding: 0.85rem 1.75rem;
      border-radius: 12px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      color: var(--text-muted);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.25s;
    }
    .tab-btn:hover {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main);
    }
    .tab-btn.active {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(59, 130, 246, 0.2));
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      box-shadow: 0 4px 16px rgba(6, 182, 212, 0.15);
    }

    /* QUICK RANDOM GENERATOR BAR */
    .quick-random-bar {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 0.85rem;
      margin: -0.75rem auto 1.75rem auto;
      flex-wrap: wrap;
    }
    .btn-random-pick {
      display: inline-flex;
      align-items: center;
      gap: 0.55rem;
      padding: 0.65rem 1.25rem;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      backdrop-filter: blur(8px);
      text-decoration: none;
    }
    .btn-random-pick i {
      font-size: 0.95rem;
      transition: transform 0.35s ease;
    }
    .btn-random-pick:hover i {
      transform: rotate(180deg);
    }
    .btn-random-t1 {
      background: rgba(6, 182, 212, 0.08);
      border: 1px solid rgba(6, 182, 212, 0.3);
      color: #22d3ee;
    }
    .btn-random-t1:hover {
      background: rgba(6, 182, 212, 0.18);
      border-color: var(--accent-cyan);
      box-shadow: 0 0 18px rgba(6, 182, 212, 0.28);
      transform: translateY(-2px);
      color: #67e8f9;
    }
    .btn-random-t2 {
      background: rgba(245, 158, 11, 0.08);
      border: 1px solid rgba(245, 158, 11, 0.3);
      color: #fbbf24;
    }
    .btn-random-t2:hover {
      background: rgba(245, 158, 11, 0.18);
      border-color: var(--accent-amber);
      box-shadow: 0 0 18px rgba(245, 158, 11, 0.28);
      transform: translateY(-2px);
      color: #fde68a;
    }
    .random-badge-sub {
      font-size: 0.75rem;
      opacity: 0.85;
      background: rgba(255, 255, 255, 0.08);
      padding: 0.15rem 0.5rem;
      border-radius: 9999px;
      font-weight: 500;
    }
    :root[data-theme="light"] .btn-random-t1, html:not(.dark) .btn-random-t1 {
      background: rgba(6, 182, 212, 0.1);
      border-color: rgba(6, 182, 212, 0.4);
      color: #0891b2;
    }
    :root[data-theme="light"] .btn-random-t1:hover, html:not(.dark) .btn-random-t1:hover {
      background: rgba(6, 182, 212, 0.18);
      color: #0e7490;
    }
    :root[data-theme="light"] .btn-random-t2, html:not(.dark) .btn-random-t2 {
      background: rgba(245, 158, 11, 0.1);
      border-color: rgba(245, 158, 11, 0.4);
      color: #d97706;
    }
    :root[data-theme="light"] .btn-random-t2:hover, html:not(.dark) .btn-random-t2:hover {
      background: rgba(245, 158, 11, 0.18);
      color: #b45309;
    }
    :root[data-theme="light"] .random-badge-sub, html:not(.dark) .random-badge-sub {
      background: rgba(0, 0, 0, 0.06);
    }

    /* CARD PULSE HIGHLIGHT */
    @keyframes cardPulseGlow {
      0% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
      50% { box-shadow: 0 0 25px 6px rgba(6, 182, 212, 0.5); }
      100% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
    }
    @keyframes cardPulseAmber {
      0% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7); }
      50% { box-shadow: 0 0 25px 6px rgba(245, 158, 11, 0.5); }
      100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
    }
    .highlight-pulse-t1 {
      animation: cardPulseGlow 1.8s cubic-bezier(0.16, 1, 0.3, 1) 2;
      border-color: var(--accent-cyan) !important;
    }
    .highlight-pulse-t2 {
      animation: cardPulseAmber 1.8s cubic-bezier(0.16, 1, 0.3, 1) 2;
      border-color: var(--accent-amber) !important;
    }

    /* RANDOM MODAL BANNER */
    .random-modal-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
      padding: 0.65rem 1rem;
      border-radius: 12px;
      margin-bottom: 1.25rem;
      font-size: 0.85rem;
      font-weight: 600;
      flex-wrap: wrap;
    }
    .random-modal-banner.banner-t1 {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(59, 130, 246, 0.15));
      border: 1px solid rgba(6, 182, 212, 0.35);
      color: #67e8f9;
    }
    .random-modal-banner.banner-t2 {
      background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(234, 88, 12, 0.15));
      border: 1px solid rgba(245, 158, 11, 0.35);
      color: #fde68a;
    }
    :root[data-theme="light"] .random-modal-banner.banner-t1, html:not(.dark) .random-modal-banner.banner-t1 {
      color: #0891b2;
    }
    :root[data-theme="light"] .random-modal-banner.banner-t2, html:not(.dark) .random-modal-banner.banner-t2 {
      color: #b45309;
    }
    .btn-reroll-modal {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.35rem 0.75rem;
      border-radius: 8px;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: inherit;
      font-size: 0.8rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-reroll-modal:hover {
      background: rgba(255, 255, 255, 0.22);
      transform: scale(1.03);
    }

    /* SEARCH BAR */
    .search-wrapper {
      max-width: 680px;
      margin: 0 auto 1.5rem auto;
      position: relative;
      display: flex;
      align-items: center;
    }
    .search-input {
      width: 100%;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 0.9rem 3rem 0.9rem 2.75rem;
      color: var(--text-main);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }
    .search-input:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    }
    .search-icon {
      position: absolute;
      left: 1rem;
      color: var(--text-muted);
      font-size: 0.9rem;
      pointer-events: none;
    }
    .search-clear-btn {
      position: absolute;
      right: 1rem;
      background: transparent;
      border: none;
      color: var(--text-muted);
      cursor: pointer;
      font-size: 0.85rem;
      padding: 0.25rem;
    }
    .search-clear-btn:hover {
      color: var(--text-main);
    }

    /* FILTER BAR FOR TASK 2 */
    .filter-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 1.25rem 1.5rem;
      margin-bottom: 2rem;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .filter-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.6rem;
    }
    .filter-label {
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-muted);
      min-width: 110px;
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }
    .filter-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 0.45rem;
      flex: 1;
    }
    .pill-btn {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--border-color);
      color: var(--text-muted);
      font-size: 0.82rem;
      font-weight: 600;
      padding: 0.4rem 0.85rem;
      border-radius: 9999px;
      cursor: pointer;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
    }
    .pill-btn:hover {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-main);
      border-color: rgba(255, 255, 255, 0.18);
    }
    .pill-btn.active {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(59, 130, 246, 0.2));
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      box-shadow: 0 2px 8px rgba(6, 182, 212, 0.15);
    }
    :root[data-theme="light"] .pill-btn, html:not(.dark) .pill-btn {
      background: #f1f5f9;
      color: #64748b;
    }
    :root[data-theme="light"] .pill-btn.active, html:not(.dark) .pill-btn.active {
      background: #e0f2fe;
      color: #0284c7;
      border-color: #0284c7;
    }
    .topic-select {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      font-size: 0.85rem;
      font-weight: 500;
      padding: 0.45rem 1rem;
      border-radius: 10px;
      outline: none;
      cursor: pointer;
      font-family: inherit;
      min-width: 240px;
    }
    .topic-select:focus {
      border-color: var(--accent-cyan);
    }

    .search-count-banner {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .search-count-banner strong {
      color: var(--accent-cyan);
    }

    /* TASK SECTIONS */
    .task-section {
      display: none;
    }
    .task-section.active {
      display: block;
    }

    /* CARDS GRID */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1.5rem;
    }
    @media (max-width: 900px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    .writing-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 18px;
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.25s;
      position: relative;
    }
    .writing-card:hover {
      transform: translateY(-3px);
      border-color: rgba(6, 182, 212, 0.35);
      box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    }
    :root[data-theme="light"] .writing-card:hover, html:not(.dark) .writing-card:hover {
      box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
    }

    .card-header-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 0.9rem;
      flex-wrap: wrap;
    }
    .badge-group {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      flex-wrap: wrap;
    }
    .badge {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.25rem 0.6rem;
      border-radius: 6px;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }
    .badge-t1 {
      background: rgba(6, 182, 212, 0.15);
      color: var(--accent-cyan);
    }
    .badge-t2 {
      background: rgba(139, 92, 246, 0.15);
      color: var(--accent-purple);
    }
    .badge-theme {
      background: rgba(59, 130, 246, 0.12);
      color: #60a5fa;
    }
    .badge-no {
      background: rgba(255, 255, 255, 0.06);
      color: #94a3b8;
      font-family: monospace;
    }
    .badge-meta {
      background: rgba(255, 255, 255, 0.06);
      color: var(--text-muted);
    }

    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 0.75rem;
      color: #fff;
    }
    .card-prompt {
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.5;
      margin-bottom: 1rem;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
      overflow: hidden;
      font-style: normal;
    }

    .colloc-tags-preview {
      display: flex;
      flex-wrap: wrap;
      gap: 0.35rem;
      margin-bottom: 1.25rem;
    }
    .chip {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.22rem 0.55rem;
      border-radius: 6px;
      font-size: 0.78rem;
      color: #cbd5e1;
    }

    .card-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-top: 1rem;
      border-top: 1px solid var(--border-color);
      gap: 0.5rem;
      flex-wrap: wrap;
    }
    .footer-actions {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .btn-idea {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      background: rgba(245, 158, 11, 0.12);
      border: 1px solid rgba(245, 158, 11, 0.35);
      color: var(--accent-amber);
      font-weight: 600;
      font-size: 0.85rem;
      padding: 0.55rem 0.9rem;
      border-radius: 10px;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-idea:hover {
      background: rgba(245, 158, 11, 0.22);
      transform: scale(1.02);
    }
    .btn-launch {
      display: inline-flex;
      align-items: center;
      gap: 0.45rem;
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
      color: #fff;
      font-weight: 600;
      font-size: 0.85rem;
      padding: 0.55rem 1rem;
      border-radius: 10px;
      text-decoration: none;
      transition: all 0.2s;
    }
    .btn-launch:hover {
      transform: scale(1.02);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.35);
    }

    /* LOAD MORE BUTTON */
    .load-more-wrapper {
      text-align: center;
      margin-top: 2.5rem;
    }
    .btn-load-more {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 600;
      padding: 0.85rem 2rem;
      border-radius: 12px;
      cursor: pointer;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }
    .btn-load-more:hover {
      border-color: var(--accent-cyan);
      background: rgba(6, 182, 212, 0.08);
      color: var(--accent-cyan);
    }

    /* THEME TOGGLE BUTTON */
    .btn-theme-toggle {
      background: var(--bg-glass);
      border: 1px solid var(--border-color);
      color: var(--text-muted);
      width: 38px;
      height: 38px;
      border-radius: 12px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all 0.2s;
      flex-shrink: 0;
    }
    .btn-theme-toggle:hover {
      background: rgba(255, 255, 255, 0.1);
      color: var(--text-main);
    }
    :root[data-theme="light"] .btn-theme-toggle, html:not(.dark) .btn-theme-toggle {
      background: #f1f5f9;
      color: #475569;
    }

    /* IDEA EXPANSION MODAL */
    .idea-modal-overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(3, 7, 18, 0.82);
      backdrop-filter: blur(10px);
      z-index: 1000;
      display: none;
      align-items: center;
      justify-content: center;
      padding: 1.5rem;
      opacity: 0;
      transition: opacity 0.25s ease;
    }
    .idea-modal-overlay.active {
      display: flex;
      opacity: 1;
    }
    .idea-modal-container {
      background: #0f172a;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      width: 100%;
      max-width: 900px;
      max-height: 90vh;
      display: flex;
      flex-direction: column;
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
      animation: modalSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      transition: max-width 0.28s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .idea-modal-container.matrix-mode-active {
      max-width: min(96vw, 1200px);
    }
    :root[data-theme="light"] .idea-modal-container, html:not(.dark) .idea-modal-container {
      background: #ffffff;
      border-color: #e2e8f0;
    }
    @keyframes modalSlideUp {
      from { transform: translateY(20px) scale(0.97); opacity: 0; }
      to { transform: translateY(0) scale(1); opacity: 1; }
    }

    .modal-header {
      padding: 1.25rem 1.75rem;
      border-bottom: 1px solid var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 1rem;
    }
    .modal-title-area {
      flex: 1;
    }
    .modal-badges {
      display: flex;
      gap: 0.4rem;
      margin-bottom: 0.5rem;
      flex-wrap: wrap;
    }
    .modal-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: #fff;
      line-height: 1.3;
    }
    :root[data-theme="light"] .modal-title, html:not(.dark) .modal-title {
      color: #0f172a;
    }
    .modal-close-btn {
      background: transparent;
      border: none;
      color: var(--text-muted);
      font-size: 1.2rem;
      cursor: pointer;
      width: 36px;
      height: 36px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s;
    }
    .modal-close-btn:hover {
      background: rgba(255, 255, 255, 0.1);
      color: #fff;
    }
    :root[data-theme="light"] .modal-close-btn:hover, html:not(.dark) .modal-close-btn:hover {
      background: #f1f5f9;
      color: #0f172a;
    }

    .modal-body {
      padding: 1.75rem;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .modal-prompt-box {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 1rem 1.25rem;
      font-size: 0.95rem;
      line-height: 1.6;
      color: #e2e8f0;
      border-left: 4px solid var(--accent-cyan);
    }
    :root[data-theme="light"] .modal-prompt-box, html:not(.dark) .modal-prompt-box {
      background: #f8fafc;
      color: #334155;
    }

    .modal-thesis-box {
      background: rgba(59, 130, 246, 0.08);
      border: 1px solid rgba(59, 130, 246, 0.25);
      border-radius: 12px;
      padding: 1rem 1.25rem;
      font-size: 0.92rem;
      line-height: 1.55;
      color: #bfdbfe;
    }
    :root[data-theme="light"] .modal-thesis-box, html:not(.dark) .modal-thesis-box {
      background: #eff6ff;
      color: #1e40af;
      border-color: #bfdbfe;
    }

    .arguments-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.25rem;
    }
    @media (max-width: 768px) {
      .arguments-grid {
        grid-template-columns: 1fr;
      }
    }
    .side-column {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 1.25rem;
      display: flex;
      flex-direction: column;
      gap: 0.85rem;
    }
    :root[data-theme="light"] .side-column, html:not(.dark) .side-column {
      background: #f8fafc;
    }

    /* Idea View Switcher (Outline vs 5x5 Matrix) */
    .idea-view-switcher {
      display: inline-flex;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 2px;
      gap: 2px;
    }
    :root[data-theme="light"] .idea-view-switcher, html:not(.dark) .idea-view-switcher {
      background: #f1f5f9;
    }
    .btn-idea-view {
      background: transparent;
      border: none;
      border-radius: 6px;
      padding: 4px 10px;
      font-size: 0.74rem;
      font-weight: 600;
      color: var(--text-muted);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 5px;
      transition: all 0.15s ease;
    }
    .btn-idea-view:hover {
      color: var(--text-primary);
    }
    .btn-idea-view.active {
      background: var(--accent-cyan);
      color: #0b0f19;
      font-weight: 700;
    }
    :root[data-theme="light"] .btn-idea-view.active, html:not(.dark) .btn-idea-view.active {
      background: #ffffff;
      color: #0284c7;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    }

    /* 5x5 Brainstorming Matrix & P-E-E-R Development styles have been modularized into ./writing-matrix.css */
    .side-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--accent-cyan);
      display: flex;
      align-items: center;
      gap: 0.4rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border-color);
    }
    .side-point-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 0.85rem;
      font-size: 0.85rem;
    }
    :root[data-theme="light"] .side-point-card, html:not(.dark) .side-point-card {
      background: #ffffff;
    }
    .point-idea {
      font-weight: 700;
      color: #f1f5f9;
      margin-bottom: 0.35rem;
    }
    :root[data-theme="light"] .point-idea, html:not(.dark) .point-idea {
      color: #0f172a;
    }
    .point-exp {
      color: var(--text-muted);
      line-height: 1.45;
      margin-bottom: 0.4rem;
    }
    .point-ex {
      color: #94a3b8;
      font-style: italic;
      font-size: 0.8rem;
    }
    :root[data-theme="light"] .point-ex, html:not(.dark) .point-ex {
      color: #64748b;
    }
    .point-result, .point-tip {
      margin-top: 0.45rem;
      padding-top: 0.4rem;
      border-top: 1px solid rgba(148, 163, 184, 0.16);
      color: #cbd5e1;
      font-size: 0.79rem;
      line-height: 1.45;
    }
    .point-tip { color: #fbbf24; }
    html:not(.dark) .point-result, html:not(.dark) .point-tip { color: #475569; }
    html:not(.dark) .point-tip { color: #a16207; }

    .modal-colloc-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      gap: 0.75rem;
    }
    .modal-colloc-item {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 0.75rem;
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
    }
    :root[data-theme="light"] .modal-colloc-item, html:not(.dark) .modal-colloc-item {
      background: #f8fafc;
    }
    .modal-colloc-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .modal-colloc-phrase {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--accent-emerald);
    }
    .btn-modal-speak {
      background: transparent;
      border: none;
      color: var(--accent-cyan);
      cursor: pointer;
      font-size: 0.85rem;
      padding: 0.2rem;
    }
    .modal-colloc-viet {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .modal-colloc-usage {
      font-size: 0.76rem;
      color: #64748b;
      font-style: italic;
    }

    .modal-footer {
      padding: 1.25rem 1.75rem;
      border-top: 1px solid var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 1rem;
      background: rgba(11, 15, 25, 0.5);
    }
    :root[data-theme="light"] .modal-footer, html:not(.dark) .modal-footer {
      background: #f8fafc;
    }
    .btn-modal-copy {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      font-size: 0.88rem;
      font-weight: 600;
      padding: 0.6rem 1.2rem;
      border-radius: 10px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      transition: all 0.2s;
    }
    .btn-modal-copy:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: var(--accent-cyan);
    }
    .btn-modal-launch {
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
      color: #fff;
      font-size: 0.9rem;
      font-weight: 600;
      padding: 0.65rem 1.4rem;
      border-radius: 10px;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      transition: all 0.2s;
    }
    .btn-modal-launch:hover {
      transform: scale(1.02);
      box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
    }

    /* FOOTER */
    footer {
      text-align: center;
      padding: 2.5rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
      font-size: 0.9rem;
    }

    /* LESSONS SECTION & CARDS */
    .lessons-hero-banner {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.08));
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 2rem 2.5rem;
      margin-bottom: 2rem;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    :root[data-theme="light"] .lessons-hero-banner, html:not(.dark) .lessons-hero-banner {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.06), rgba(139, 92, 246, 0.06));
      border-color: #e2e8f0;
    }
    .lessons-hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.45rem;
      padding: 0.35rem 0.9rem;
      border-radius: 9999px;
      background: rgba(139, 92, 246, 0.15);
      border: 1px solid rgba(139, 92, 246, 0.3);
      color: var(--accent-purple);
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 0.85rem;
    }
    .lessons-hero-title {
      font-size: 1.85rem;
      font-weight: 800;
      color: #fff;
      margin-bottom: 0.65rem;
      letter-spacing: -0.02em;
    }
    :root[data-theme="light"] .lessons-hero-title, html:not(.dark) .lessons-hero-title {
      color: #0f172a;
    }
    .lessons-hero-sub {
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto;
      font-size: 0.98rem;
      line-height: 1.6;
    }
    .lessons-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1.5rem;
      margin-bottom: 3rem;
    }
    @media (max-width: 960px) {
      .lessons-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
      }
    }
    .lesson-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 20px;
      overflow: hidden;
      display: flex;
      flex-direction: row;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    }
    .lesson-card:hover {
      transform: translateY(-4px);
      border-color: rgba(6, 182, 212, 0.4);
      box-shadow: 0 16px 36px -10px rgba(6, 182, 212, 0.2);
    }
    :root[data-theme="light"] .lesson-card, html:not(.dark) .lesson-card {
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    }
    :root[data-theme="light"] .lesson-card:hover, html:not(.dark) .lesson-card:hover {
      box-shadow: 0 16px 30px -10px rgba(0, 0, 0, 0.12);
    }
    .lesson-card-banner {
      width: 175px;
      min-width: 175px;
      max-width: 175px;
      padding: 1.75rem 1rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      gap: 0.85rem;
      position: relative;
      border-bottom: none;
      border-right: 1px solid var(--border-color);
      flex-shrink: 0;
    }
    .banner-cyan {
      background: linear-gradient(180deg, rgba(6, 182, 212, 0.18), rgba(59, 130, 246, 0.08));
    }
    .banner-amber {
      background: linear-gradient(180deg, rgba(245, 158, 11, 0.18), rgba(217, 119, 6, 0.08));
    }
    .banner-purple {
      background: linear-gradient(180deg, rgba(139, 92, 246, 0.18), rgba(99, 102, 241, 0.08));
    }
    .banner-emerald {
      background: linear-gradient(180deg, rgba(16, 185, 129, 0.18), rgba(5, 150, 105, 0.08));
    }
    .lesson-icon-circle {
      width: 56px;
      height: 56px;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      transition: transform 0.3s ease;
    }
    .lesson-card:hover .lesson-icon-circle {
      transform: scale(1.08);
    }
    .banner-cyan .lesson-icon-circle {
      background: rgba(6, 182, 212, 0.2);
      color: var(--accent-cyan);
      border: 1px solid rgba(6, 182, 212, 0.35);
    }
    .banner-amber .lesson-icon-circle {
      background: rgba(245, 158, 11, 0.2);
      color: var(--accent-amber);
      border: 1px solid rgba(245, 158, 11, 0.35);
    }
    .banner-purple .lesson-icon-circle {
      background: rgba(139, 92, 246, 0.2);
      color: var(--accent-purple);
      border: 1px solid rgba(139, 92, 246, 0.35);
    }
    .banner-emerald .lesson-icon-circle {
      background: rgba(16, 185, 129, 0.2);
      color: #10b981;
      border: 1px solid rgba(16, 185, 129, 0.35);
    }
    .lesson-badge-tag {
      font-size: 0.72rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      padding: 0.3rem 0.6rem;
      border-radius: 6px;
      background: rgba(0, 0, 0, 0.3);
      backdrop-filter: blur(4px);
      text-align: center;
      line-height: 1.25;
    }
    .banner-cyan .lesson-badge-tag { color: var(--accent-cyan); border: 1px solid rgba(6, 182, 212, 0.3); }
    .banner-amber .lesson-badge-tag { color: var(--accent-amber); border: 1px solid rgba(245, 158, 11, 0.3); }
    .banner-purple .lesson-badge-tag { color: var(--accent-purple); border: 1px solid rgba(139, 92, 246, 0.3); }
    .banner-emerald .lesson-badge-tag { color: #10b981; border: 1px solid rgba(16, 185, 129, 0.3); }

    .lesson-card-content {
      padding: 1.4rem 1.6rem;
      display: flex;
      flex-direction: column;
      flex: 1;
      min-width: 0;
      justify-content: space-between;
    }
    .lesson-meta-badges {
      display: flex;
      align-items: center;
      gap: 0.45rem;
      flex-wrap: wrap;
      margin-bottom: 0.55rem;
    }
    .lesson-title {
      font-size: 1.2rem;
      font-weight: 800;
      color: #fff;
      margin-bottom: 0.45rem;
      line-height: 1.35;
    }
    :root[data-theme="light"] .lesson-title, html:not(.dark) .lesson-title {
      color: #0f172a;
    }
    .lesson-desc {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.5;
      margin-bottom: 0.85rem;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .lesson-highlights {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.45rem 0.75rem;
      padding: 0.75rem 0.95rem;
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      margin-bottom: 1rem;
    }
    :root[data-theme="light"] .lesson-highlights, html:not(.dark) .lesson-highlights {
      background: #f8fafc;
    }
    .highlight-item {
      display: flex;
      align-items: flex-start;
      gap: 0.45rem;
      font-size: 0.78rem;
      line-height: 1.4;
      color: #cbd5e1;
    }
    :root[data-theme="light"] .highlight-item, html:not(.dark) .highlight-item {
      color: #334155;
    }
    .highlight-item i {
      margin-top: 0.15rem;
      font-size: 0.78rem;
      flex-shrink: 0;
    }
    .text-cyan { color: var(--accent-cyan); }
    .text-amber { color: var(--accent-amber); }
    .text-purple { color: var(--accent-purple); }

    .lesson-card-footer {
      border-top: 1px solid var(--border-color);
      padding-top: 0.9rem;
      display: flex;
      flex-direction: row;
      gap: 0.65rem;
    }
    @media (max-width: 640px) {
      .lesson-card {
        flex-direction: column;
      }
      .lesson-card-banner {
        width: 100%;
        min-width: 100%;
        max-width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        flex-direction: row;
        justify-content: space-between;
        padding: 0.85rem 1.25rem;
        gap: 0.75rem;
      }
      .lesson-icon-circle {
        width: 44px;
        height: 44px;
        font-size: 1.25rem;
      }
      .lesson-highlights {
        grid-template-columns: 1fr;
      }
      .lesson-card-footer {
        flex-direction: column;
      }
    }
    .btn-lesson-launch {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      width: 100%;
      padding: 0.7rem 1rem;
      border-radius: 12px;
      font-weight: 700;
      font-size: 0.84rem;
      text-decoration: none;
      transition: all 0.25s;
      flex: 1.2;
      white-space: nowrap;
    }
    .btn-lesson-practice {
      flex: 1;
      white-space: nowrap;
    }
    .btn-lesson-t1 {
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
      color: #fff;
    }
    .btn-lesson-t1:hover {
      box-shadow: 0 4px 18px rgba(6, 182, 212, 0.4);
      transform: translateY(-2px);
    }
    .btn-lesson-amber {
      background: linear-gradient(135deg, #f59e0b, #d97706);
      color: #fff;
    }
    .btn-lesson-amber:hover {
      box-shadow: 0 4px 18px rgba(245, 158, 11, 0.4);
      transform: translateY(-2px);
    }
    .btn-lesson-purple {
      background: linear-gradient(135deg, #8b5cf6, #6366f1);
      color: #fff;
    }
    .btn-lesson-purple:hover {
      box-shadow: 0 4px 18px rgba(139, 92, 246, 0.4);
      transform: translateY(-2px);
    }
    .btn-lesson-emerald {
      background: linear-gradient(135deg, #10b981, #059669);
      color: #fff;
    }
    .btn-lesson-emerald:hover {
      box-shadow: 0 4px 18px rgba(16, 185, 129, 0.4);
      transform: translateY(-2px);
    }
    .btn-lesson-practice {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      color: var(--text-main);
    }
    .btn-lesson-practice:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: rgba(255, 255, 255, 0.3);
      transform: translateY(-2px);
    }

    /* RESPONSIVE DESIGN FOR MOBILE */
    @media (max-width: 768px) {
      .navbar {
        padding: 0.75rem 1rem;
        flex-wrap: nowrap;
        gap: 0.5rem;
      }
      .nav-links {
        gap: 0.5rem;
        width: auto;
        padding-bottom: 0;
      }
      .container {
        padding: 1.5rem 1rem;
      }
      .hero-title {
        font-size: 1.75rem;
      }
      .hero-sub {
        font-size: 0.9rem;
      }
      .tab-bar {
        flex-direction: column;
        gap: 0.6rem;
      }
      .tab-btn {
        width: 100%;
        justify-content: center;
      }
      .cards-grid {
        grid-template-columns: 1fr;
      }
      .filter-panel {
        padding: 1rem;
      }
      .filter-row {
        flex-direction: column;
        align-items: flex-start;
      }
    }