body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Space Grotesk', sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 20% 20%, rgba(245,200,66,0.03) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 80%, rgba(245,200,66,0.02) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
  }

  /* Header */
  .app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 56px;
    border-bottom: 1px solid var(--border);
    background: rgba(10,10,15,0.95);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-shrink: 0;
  }

  .logo-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo-svg {
    height: 22px;
    width: auto;
    opacity: 0.9;
  }

  .logo-tag {
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    color: var(--accent);
    background: var(--accent-dim);
    border: 1px solid rgba(245,200,66,0.25);
    padding: 2px 7px;
    border-radius: 4px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }

  /* Nav tabs */
  .nav-tabs {
    display: flex;
    gap: 2px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 3px;
  }

  .nav-tab {
    padding: 6px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text2);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
  }

  .nav-tab:hover { color: var(--text); }

  .nav-tab.active {
    background: var(--surface3);
    color: var(--text);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  }

  .nav-tab .tab-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--text3);
    transition: background 0.2s;
  }

  .nav-tab.active .tab-dot { background: var(--accent); }

  .tab-icon { font-size: 13px; }
  .tab-svg { width: 14px; height: 14px; flex-shrink: 0; opacity: 0.5; }
  .nav-tab.active .tab-svg { opacity: 1; }
  .mobile-menu-svg { width: 18px; height: 18px; flex-shrink: 0; opacity: 0.5; }
  .mobile-menu-item.active .mobile-menu-svg { opacity: 1; }

  /* Burger button & mobile balance (mobile only) */
  .mobile-header-right { display: none; }
  .mobile-balance { display: none; }
  .burger-btn {
    display: none;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 8px;
    color: var(--text2);
    cursor: pointer;
    transition: all 0.2s;
    order: 3;
  }
  .burger-btn:hover { border-color: var(--accent); color: var(--accent); }

  /* Mobile side menu */
  .mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 999;
    backdrop-filter: blur(4px);
  }
  .mobile-menu-overlay.open { display: block; }

  .mobile-menu {
    position: fixed;
    top: 0;
    left: -280px;
    width: 260px;
    height: 100%;
    background: var(--surface);
    border-right: 1px solid var(--border);
    z-index: 1000;
    transition: left 0.25s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 24px rgba(0,0,0,0.4);
  }
  .mobile-menu.open { left: 0; }

  .mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
  }
  .mobile-menu-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text3);
    font-family: 'Space Mono', monospace;
  }
  .mobile-menu-close {
    background: none;
    border: none;
    color: var(--text3);
    font-size: 16px;
    cursor: pointer;
    padding: 4px;
  }
  .mobile-menu-close:hover { color: var(--accent); }

  .mobile-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text2);
    cursor: pointer;
    transition: all 0.15s;
    border-left: 3px solid transparent;
  }
  .mobile-menu-item:hover { background: var(--surface2); color: var(--text); }
  .mobile-menu-item.active {
    color: var(--accent);
    border-left-color: var(--accent);
    background: var(--accent-dim);
  }
  .mobile-menu-icon { font-size: 18px; }

  /* Header right */
  .header-right {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .usage-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 5px 12px;
    font-size: 12px;
    font-family: 'Space Mono', monospace;
  }

  .usage-badge { transition: all 0.3s; }
  .usage-badge.low-credits { border-color: rgba(245,200,66,0.4); box-shadow: 0 0 12px rgba(245,200,66,0.15); }
  .usage-label { color: var(--text3); font-size: 10px; }
  .usage-count { color: var(--accent); font-weight: 700; }
  .usage-count.low { color: var(--error); }

  .usage-bar-wrap {
    width: 60px; height: 3px;
    background: var(--surface3);
    border-radius: 2px;
    overflow: hidden;
  }

  .usage-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.4s ease;
  }

  .usage-bar.low { background: var(--error); }

  .auth-user-btn {
    display: flex; align-items: center; gap: 7px;
    background: var(--surface2); border: 1px solid var(--border2);
    border-radius: 8px; padding: 5px 12px;
    font-size: 12px; color: var(--text2); cursor: pointer; transition: all 0.2s;
    font-family: 'Space Grotesk', sans-serif;
  }

  .auth-user-btn:hover { border-color: var(--accent); color: var(--accent); }
  .auth-user-email { max-width: 130px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

  /* Layout */
  .main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
    position: relative;
    z-index: 1;
  }

  /* Sidebar */
  .sidebar {
    width: 300px;
    min-width: 300px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    background: var(--surface);
  }

  .sidebar::-webkit-scrollbar { width: 3px; }
  .sidebar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

  .sidebar-section {
    padding: 16px;
    border-bottom: 1px solid var(--border);
  }

  .section-label {
    font-size: 9px;
    font-weight: 700;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 10px;
    font-family: 'Space Mono', monospace;
  }

  /* Model selector */
  .model-cards {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .model-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface2);
    gap: 10px;
  }

  .model-card:hover { border-color: var(--border2); background: var(--surface3); }

  .model-card.active {
    border-color: rgba(245,200,66,0.45);
    background: rgba(245,200,66,0.06);
  }

  .model-card-left { display: flex; align-items: flex-start; gap: 10px; }

  .model-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    border: 2px solid var(--text3);
    transition: all 0.2s;
    flex-shrink: 0;
  }

  .model-card.active .model-dot {
    border-color: var(--accent);
    background: var(--accent);
    box-shadow: 0 0 8px rgba(245,200,66,0.5);
  }

  .model-name { font-size: 13px; font-weight: 600; color: var(--text); }
  .model-desc { font-size: 11px; color: var(--text2); margin-top: 1px; }

  .model-badge {
    font-size: 13px;
    font-weight: 700;
    padding: 5px 10px;
    border-radius: 6px;
    font-family: 'Space Mono', monospace;
    white-space: nowrap;
    flex-shrink: 0;
    line-height: 1;
  }

  .model-badge.free {
    background: rgba(74,222,128,0.1);
    color: var(--success);
    border: 1px solid rgba(74,222,128,0.2);
  }

  .model-badge.pro {
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(245,200,66,0.25);
  }

  /* Mode tabs */
  .mode-tabs {
    display: flex;
    background: var(--surface2);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 2px;
  }

  .mode-tab {
    flex: 1;
    padding: 7px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text2);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
  }

  .mode-tab.active {
    background: var(--surface3);
    color: var(--accent);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  }

  /* Form elements */
  .field-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text2);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .char-count { font-weight: 400; color: var(--text3); font-size: 10px; font-family: 'Space Mono', monospace; }

  textarea {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    padding: 10px;
    outline: none;
    transition: border-color 0.2s;
    resize: none;
    min-height: 80px;
    line-height: 1.5;
  }

  textarea:focus { border-color: rgba(245,200,66,0.4); }
  textarea::placeholder { color: var(--text3); }

  input[type="file"] { display: none; }

  .upload-zone {
    border: 1px dashed var(--border2);
    border-radius: var(--radius-sm);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
  }

  .upload-zone:hover { border-color: rgba(245,200,66,0.4); background: var(--accent-dim); }
  .upload-zone.has-image { border-style: solid; border-color: rgba(245,200,66,0.3); }
  .upload-icon { width: 24px; height: 24px; margin: 0 auto 6px; display: block; color: var(--text3); }
  .upload-text { font-size: 12px; color: var(--text2); }
  .upload-hint { font-size: 10px; color: var(--text3); margin-top: 3px; }

  /* Settings */
  .setting-group { margin-bottom: 12px; }
  .options-grid { display: flex; gap: 5px; flex-wrap: wrap; }

  .opt-btn {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 5px 10px;
    font-size: 12px;
    color: var(--text2);
    cursor: pointer;
    transition: all 0.15s;
    font-family: 'Space Mono', monospace;
  }

  .opt-btn:hover { border-color: var(--border2); color: var(--text); }
  .opt-btn.active { background: var(--accent-dim); border-color: rgba(245,200,66,0.4); color: var(--accent); font-weight: 700; }
  .opt-btn.locked { opacity: 0.5; }

  /* Generate button */
  .gen-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border: none;
    border-radius: var(--radius-sm);
    padding: 13px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 14px;
    color: #08080a;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.02em;
    position: relative;
    overflow: hidden;
  }

  .gen-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity 0.2s;
  }

  .gen-btn:hover::before { opacity: 1; }
  .gen-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(245,200,66,0.35); }
  .gen-btn:active { transform: translateY(0); }
  .gen-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
  .gen-cost-badge {
    background: rgba(0,0,0,0.2); border-radius: 4px; padding: 2px 7px;
    font-size: 12px; font-weight: 700; margin-left: 6px;
  }
  .gen-cost-badge:empty { display: none; }

  .limit-note { text-align: center; font-size: 11px; color: var(--text3); margin-top: 8px; }

  /* Canvas */
  .canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    overflow: hidden;
    min-width: 0;
  }

  .canvas-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    min-height: 42px;
  }

  .toolbar-info { font-size: 11px; color: var(--text2); font-family: 'Space Mono', monospace; }

  .toolbar-btn {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 11px;
    color: var(--text2);
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: 'Space Grotesk', sans-serif;
  }

  .toolbar-btn:hover { border-color: var(--border2); color: var(--text); }
  .toolbar-btn.primary { background: var(--accent-dim); border-color: rgba(245,200,66,0.3); color: var(--accent); }

  .result-canvas {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 24px;
    overflow-y: auto;
    position: relative;
    gap: 16px;
    min-height: 0;
  }

  #videoResultCanvas { overflow: hidden; }

  .result-container {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 0;
  }

  /* Empty state */
  .empty-state { text-align: center; max-width: 360px; margin: auto; padding: 40px 0; }

  .empty-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    display: block;
    color: var(--text3);
    filter: drop-shadow(0 0 20px rgba(255,255,255,0.05));
    animation: float 4s ease-in-out infinite;
  }

  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
  }

  .empty-title { font-weight: 700; font-size: 20px; margin-bottom: 8px; }
  .empty-desc { font-size: 13px; color: var(--text2); line-height: 1.6; }

  /* Result */
  .result-image-wrap {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
    animation: fadeInUp 0.3s ease;
  }

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

  .result-image-wrap.visible { display: flex; }

  .result-img {
    max-width: 100%;
    max-height: 68vh;
    border-radius: var(--radius);
    box-shadow: var(--shadow), 0 0 0 1px var(--border);
    display: block;
  }

  .result-actions-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    max-width: 560px;
  }

  /* Loading */
  .loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10,10,15,0.88);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    backdrop-filter: blur(8px);
    z-index: 10;
  }

  .loading-overlay.visible { display: flex; }

  .history-loader {
    position: absolute;
    inset: 0;
    background: rgba(10,10,15,0.7);
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    z-index: 9;
  }
  .history-loader.visible { display: flex; }
  .history-loader .spinner { width: 32px; height: 32px; }

  .spinner {
    width: 40px; height: 40px;
    border: 2px solid var(--border2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
  }

  @keyframes spin { to { transform: rotate(360deg); } }

  .loading-text { font-weight: 600; font-size: 15px; }
  .loading-sub { font-size: 12px; color: var(--text2); font-family: 'Space Mono', monospace; }

  /* History */
  .history-panel {
    width: 188px;
    min-width: 188px;
    border-left: 1px solid var(--border);
    background: var(--surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  .history-header {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    font-size: 9px;
    font-weight: 700;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: 'Space Mono', monospace;
  }

  .history-clear { font-size: 10px; color: var(--text3); cursor: pointer; text-transform: none; letter-spacing: 0; font-weight: 400; }
  .history-clear:hover { color: var(--error); }
  .history-list { flex: 1; overflow-y: auto; padding: 6px; }
  .history-list::-webkit-scrollbar { width: 3px; }
  .history-list::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

  .history-item {
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    margin-bottom: 6px;
    transition: all 0.15s;
    border: 1px solid var(--border);
  }

  .history-item:hover { border-color: rgba(245,200,66,0.3); transform: scale(1.02); }
  .history-thumb { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
  .history-meta { padding: 5px 7px; }
  .history-prompt { font-size: 10px; color: var(--text2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .history-time { font-size: 9px; color: var(--text3); margin-top: 1px; font-family: 'Space Mono', monospace; }
  .history-empty { padding: 16px; text-align: center; color: var(--text3); font-size: 11px; line-height: 1.5; }

  /* Video coming soon */
  .coming-soon {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px;
    gap: 16px;
  }

  .coming-soon-icon { font-size: 64px; filter: drop-shadow(0 0 20px rgba(245,200,66,0.2)); animation: float 4s ease-in-out infinite; }
  .coming-soon-title { font-size: 22px; font-weight: 700; }
  .coming-soon-desc { font-size: 14px; color: var(--text2); max-width: 360px; line-height: 1.6; }

  .coming-badge {
    background: var(--accent-dim);
    border: 1px solid rgba(245,200,66,0.3);
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    padding: 5px 14px;
    border-radius: 20px;
    font-family: 'Space Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  /* Pricing modal */
  .pricing-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex; align-items: center; justify-content: center; padding: 20px;
    opacity: 0; pointer-events: none; transition: opacity 0.2s;
  }
  .pricing-overlay.visible { opacity: 1; pointer-events: all; }

  .pricing-modal {
    background: var(--surface);
    border: 1px solid var(--border2);
    border-radius: 16px;
    padding: 28px;
    width: 100%; max-width: 420px;
    box-shadow: var(--shadow);
  }

  .pricing-title { font-weight: 700; font-size: 18px; margin-bottom: 4px; }
  .pricing-desc { font-size: 12px; color: var(--text2); margin-bottom: 20px; line-height: 1.5; }

  .pricing-cards { display: flex; flex-direction: column; gap: 10px; }

  .pricing-card {
    display: flex; align-items: center; justify-content: space-between;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 16px;
    cursor: pointer;
    transition: all 0.2s;
  }
  .pricing-card:hover { border-color: var(--accent); }
  .pricing-card.popular { border-color: rgba(245,200,66,0.35); background: rgba(245,200,66,0.04); }

  .pricing-card-left { display: flex; flex-direction: column; gap: 2px; }
  .pricing-card-name { font-weight: 600; font-size: 15px; display: flex; align-items: center; gap: 8px; }
  .pricing-card-credits { font-size: 12px; color: var(--text2); }
  .pricing-popular-tag {
    font-size: 9px; font-weight: 700; text-transform: uppercase;
    background: var(--accent); color: #000; padding: 2px 6px; border-radius: 4px;
    letter-spacing: 0.05em;
  }

  .pricing-card-price {
    font-family: 'Space Mono', monospace;
    font-weight: 700; font-size: 16px; color: var(--accent);
    white-space: nowrap;
  }

  .pricing-close-btn {
    width: 100%; margin-top: 14px;
    background: transparent; border: 1px solid var(--border);
    border-radius: 8px; padding: 9px;
    color: var(--text2); font-size: 13px; cursor: pointer;
    font-family: 'Space Grotesk', sans-serif;
    transition: all 0.2s;
  }
  .pricing-close-btn:hover { border-color: var(--text2); color: var(--text); }

  /* Limit wall */
  .limit-wall {
    position: fixed; inset: 0;
    background: rgba(10,10,15,0.95);
    backdrop-filter: blur(16px);
    z-index: 500;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
  }

  .limit-wall.visible { display: flex; }

  .limit-card {
    background: var(--surface);
    border: 1px solid rgba(245,200,66,0.2);
    border-radius: 20px;
    padding: 36px;
    max-width: 380px;
    text-align: center;
    box-shadow: var(--shadow);
  }

  .limit-icon { font-size: 48px; margin-bottom: 12px; display: block; }
  .limit-title { font-weight: 700; font-size: 20px; margin-bottom: 8px; }
  .limit-desc { font-size: 13px; color: var(--text2); line-height: 1.6; margin-bottom: 20px; }

  /* Auth modal */
  .auth-modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex; align-items: center; justify-content: center; padding: 20px;
    opacity: 0; pointer-events: none; transition: opacity 0.2s;
  }

  .auth-modal-overlay.visible { opacity: 1; pointer-events: all; }

  .auth-modal {
    background: var(--surface);
    border: 1px solid var(--border2);
    border-radius: 16px;
    padding: 28px;
    width: 100%; max-width: 360px;
    box-shadow: var(--shadow);
  }

  .auth-modal-title { font-weight: 700; font-size: 18px; margin-bottom: 5px; }
  .auth-modal-desc { font-size: 12px; color: var(--text2); margin-bottom: 20px; line-height: 1.5; }

  .auth-input {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 14px;
    padding: 11px;
    outline: none;
    transition: border-color 0.2s;
    margin-bottom: 10px;
  }

  .auth-input:focus { border-color: rgba(245,200,66,0.4); }

  .auth-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border: none;
    border-radius: var(--radius-sm);
    padding: 12px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 14px;
    color: #08080a;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 8px;
  }

  .auth-btn:hover { opacity: 0.9; }
  .auth-btn:disabled { opacity: 0.5; cursor: not-allowed; }

  .auth-btn-secondary {
    width: 100%;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    color: var(--text2);
    cursor: pointer;
    transition: all 0.2s;
  }

  .auth-btn-secondary:hover { border-color: var(--border2); color: var(--text); }

  /* Toast */
  .toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--surface3);
    border: 1px solid var(--border2);
    border-radius: 20px;
    padding: 9px 18px;
    font-size: 12px;
    color: var(--text);
    z-index: 2000;
    transition: transform 0.3s ease;
    white-space: nowrap;
    box-shadow: var(--shadow);
    font-family: 'Space Mono', monospace;
  }

  .toast.visible { transform: translateX(-50%) translateY(0); }
  .toast.error { border-color: rgba(248,113,113,0.4); color: var(--error); }
  .toast.success { border-color: rgba(74,222,128,0.4); color: var(--success); }

  .edit-only { display: none; }

  /* Panels for sections */
  .section-panel { display: none; flex: 1; overflow: hidden; }
  .section-panel.active { display: flex; }

  @media (max-width: 900px) {
    .history-panel { display: none; }
  }

  @media (max-width: 700px) {
    html, body { overflow-x: hidden; max-width: 100vw; }
    body { overflow-y: auto; height: auto; }
    .main-layout { flex-direction: column; height: auto; overflow: visible; }
    .sidebar { width: 100%; min-width: 100%; height: auto; position: relative; border-right: none; border-bottom: 1px solid var(--border); overflow: visible; }
    .canvas-area { overflow: visible; min-height: auto; }
    .canvas-toolbar { display: none; }
    .result-canvas { overflow: visible; min-height: auto; padding: 12px; align-items: stretch; box-sizing: border-box; max-width: 100vw; }
    .result-container {
      position: relative;
      width: 100%;
      min-height: 65vw;
      border-radius: 12px;
      overflow: hidden;
      background: var(--surface);
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    .result-container .loading-overlay,
    .result-container .history-loader {
      border-radius: 0;
      background: var(--surface);
    }
    .result-container .empty-state { padding: 20px 0; }
    .result-container .result-image-wrap { width: 100%; }
    .result-img { max-height: 75vw; width: 100%; object-fit: contain; }
    .app-header {
      padding: 8px 12px;
      height: auto;
      gap: 8px;
    }
    .logo-wrap { order: 1; }
    .header-right { display: none; }
    .nav-tabs { display: none; }
    .mobile-header-right { display: flex; align-items: center; gap: 10px; order: 3; margin-left: auto; }
    .mobile-balance { display: flex; align-items: center; gap: 4px; background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px; }
    .burger-btn { display: flex; }
    .usage-bar-wrap { display: none; }
    .logo-tag { font-size: 8px; padding: 2px 5px; }
    .mobile-history { margin: 0; padding-top: 16px; border-top: 1px solid var(--border); }
  }

  @media (max-width: 480px) {
    .sidebar-section { padding: 12px; }
    .opt-btn { padding: 4px 8px; font-size: 11px; }
    .gen-btn { padding: 11px; font-size: 13px; }
    .auth-user-btn { padding: 4px 8px; font-size: 11px; }
    .usage-badge { padding: 4px 8px; font-size: 11px; }
  }

  /* Custom select dropdown */
  .custom-select {
    position: relative;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
    cursor: pointer;
    transition: border-color 0.2s;
  }
  .custom-select:hover { border-color: var(--border2); }
  .custom-select.open { border-color: var(--accent); border-radius: 8px 8px 0 0; }
  .custom-select-value { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
  .custom-select-name { font-size: 13px; font-weight: 600; color: var(--text); flex: 1; }
  .custom-select-meta {
    font-size: 11px; color: var(--accent); font-family: 'Space Mono', monospace; font-weight: 700;
    background: var(--accent-dim); border: 1px solid rgba(245,200,66,0.3);
    padding: 2px 8px; border-radius: 5px; white-space: nowrap; flex-shrink: 0;
  }
  .custom-select-meta:empty { display: none; }
  .custom-select-arrow { color: var(--text2); transition: transform 0.2s; flex-shrink: 0; }
  .custom-select.open .custom-select-arrow { transform: rotate(180deg); }
  .custom-select-count {
    font-size: 9px; color: var(--text3); font-family: 'Space Mono', monospace;
    background: var(--surface3); border-radius: 4px; padding: 1px 5px;
    margin-left: 4px; flex-shrink: 0; white-space: nowrap;
  }
  .custom-select-options {
    display: none;
    position: absolute;
    top: 100%;
    left: -1px;
    right: -1px;
    background: var(--surface2);
    border: 1px solid var(--accent);
    border-top: 1px solid var(--border);
    border-radius: 0 0 8px 8px;
    z-index: 20;
    overflow: hidden;
  }
  .custom-select.open .custom-select-options { display: block; }
  .custom-select-opt {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 14px;
    transition: background 0.15s;
    cursor: pointer;
  }
  .custom-select-opt:hover { background: var(--surface3); }
  .custom-select-opt.active { background: rgba(245,200,66,0.06); }
  /* Video history */
  .video-history-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 1px solid var(--border);
    transition: all 0.15s;
    background: var(--surface2);
  }
  .video-history-item:hover { border-color: rgba(245,200,66,0.3); transform: scale(1.02); }
  .video-history-thumb {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    display: block;
    background: var(--surface3);
  }
  .video-history-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 32px;
    height: 32px;
    background: rgba(0,0,0,0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
  }
  .video-history-play::after {
    content: '';
    width: 0; height: 0;
    border-style: solid;
    border-width: 6px 0 6px 10px;
    border-color: transparent transparent transparent var(--accent);
    margin-left: 2px;
  }
  .video-history-meta {
    padding: 5px 7px;
  }
  .video-history-prompt {
    font-size: 10px;
    color: var(--text2);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .video-history-time {
    font-size: 9px;
    color: var(--text3);
    margin-top: 1px;
    font-family: 'Space Mono', monospace;
  }

  /* Mobile video section */
  @media (max-width: 700px) {
    #sectionVideo .sidebar { width: 100%; min-width: 100%; border-right: none; border-bottom: 1px solid var(--border); overflow: visible; }
    #sectionVideo .main-layout { flex-direction: column; height: auto; overflow: visible; }
    #sectionVideo .canvas-area { overflow: visible; min-height: auto; }
    #sectionVideo .result-canvas { overflow: visible; min-height: auto; padding: 12px; align-items: stretch; box-sizing: border-box; max-width: 100vw; }
    #sectionVideo .result-container {
      position: relative;
      width: 100%;
      min-height: 50vw;
      border-radius: 12px;
      overflow: hidden;
      background: var(--surface);
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    #sectionVideo .result-container .loading-overlay,
    #sectionVideo .result-container .history-loader {
      border-radius: 0;
      background: var(--surface);
    }
    #videoResultWrap { max-width: 100% !important; }
    #videoHistorySection { max-width: 100% !important; }
    .video-history-item { min-width: 0; }
    #sectionVideo .mobile-history { margin: 0; padding-top: 16px; border-top: 1px solid var(--border); }
  }

  /* Mobile: new sections (Refs, Motion, Edits) */
  @media (max-width: 700px) {
    #sectionRefs .sidebar, #sectionMotion .sidebar, #sectionEdits .sidebar {
      width: 100%; min-width: 100%; border-right: none; border-bottom: 1px solid var(--border); overflow: visible;
    }
    #sectionRefs .main-layout, #sectionMotion .main-layout, #sectionEdits .main-layout {
      flex-direction: column; height: auto; overflow: visible;
    }
    #sectionRefs .canvas-area, #sectionMotion .canvas-area, #sectionEdits .canvas-area {
      overflow: visible; min-height: auto;
    }
    #sectionRefs .result-canvas, #sectionMotion .result-canvas, #sectionEdits .result-canvas {
      overflow: visible; min-height: auto; padding: 12px; align-items: stretch; box-sizing: border-box; max-width: 100vw;
    }
    #sectionRefs .result-container, #sectionMotion .result-container, #sectionEdits .result-container {
      position: relative; width: 100%; min-height: 50vw; border-radius: 12px; overflow: hidden;
      background: var(--surface); border: 1px solid var(--border);
      display: flex; flex-direction: column; align-items: center; justify-content: center;
    }
  }

  /* Account section responsive */
  @media (max-width: 700px) {
    #sectionAccount { overflow-y: auto !important; }
    #sectionAccount > div { padding: 16px !important; }
  }

  /* Duration slider */
  #videoDurRange::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(245,200,66,0.4);
    border: none;
  }
  #videoDurRange::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(245,200,66,0.4);
    border: none;
  }