*{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#0f0f0f;--bg-secondary:#1a1a1a;--bg-card:#1e1e1e;--text-primary:#fff;--text-secondary:#a0a0a0;--border-color:#2a2a2a;--hover-bg:#252525}body{background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif}.container{flex-direction:column;max-width:900px;min-height:100vh;margin:0 auto;padding:2rem;display:flex}.header{text-align:center;margin-bottom:3rem;padding-top:2rem}.logo{justify-content:center;margin-bottom:1.5rem;display:flex}.title{background:linear-gradient(135deg,#4285f4,#34a853,#fbbc05,#ea4335);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:.5rem;font-size:2.5rem;font-weight:700}.subtitle{color:var(--text-secondary);font-size:1.1rem}.cards-container{flex-direction:column;flex:1;gap:1rem;display:flex}.card{background:var(--bg-card);border:1px solid var(--border-color);cursor:pointer;text-align:left;width:100%;color:var(--text-primary);border-radius:16px;align-items:center;gap:1.25rem;padding:1.5rem 2rem;font-size:1rem;transition:all .2s;display:flex}.card:hover{background:var(--hover-bg);border-color:var(--card-color);transform:translateY(-2px);box-shadow:0 8px 30px #0000004d}.card-icon{width:56px;height:56px;color:var(--card-color);background:#ffffff0d;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.card-title{flex:1;font-size:1.15rem;font-weight:500}.card-arrow{color:var(--text-secondary);font-size:1.5rem;transition:transform .2s,color .2s}.card:hover .card-arrow{color:var(--card-color);transform:translate(4px)}.footer{text-align:center;color:var(--text-secondary);margin-top:auto;padding:2rem 0;font-size:.875rem}.viewer-header{border-bottom:1px solid var(--border-color);align-items:center;gap:1rem;margin-bottom:1rem;padding:1rem 0;display:flex}.back-button{background:var(--bg-card);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;border-radius:10px;align-items:center;gap:.5rem;padding:.75rem 1.25rem;font-size:.95rem;transition:all .2s;display:flex}.back-button:hover{background:var(--hover-bg);border-color:#4285f4}.viewer-title{flex:1;font-size:1.25rem;font-weight:600}.external-link{color:#fff;background:#4285f4;border-radius:10px;align-items:center;gap:.5rem;padding:.75rem 1.25rem;font-size:.95rem;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.external-link:hover{background:#3367d6;transform:translateY(-1px)}.iframe-container{border:1px solid var(--border-color);background:#fff;border-radius:12px;flex:1;min-height:70vh;overflow:hidden}.drive-iframe{background:#fff;border:none;width:100%;height:100%;min-height:70vh}.no-embed{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:70vh;padding:2rem;display:flex}.no-embed-icon{width:80px;height:80px;color:var(--text-secondary);background:#ffffff0d;border-radius:20px;justify-content:center;align-items:center;margin-bottom:1.5rem;display:flex}.no-embed-icon svg{width:40px;height:40px}.no-embed h3{color:var(--text-primary);margin-bottom:.5rem;font-size:1.25rem;font-weight:600}.no-embed p{color:var(--text-secondary);max-width:400px;margin-bottom:1.5rem}.open-drive-btn{color:#fff;background:#4285f4;border-radius:12px;align-items:center;gap:.5rem;padding:1rem 1.5rem;font-size:1rem;font-weight:500;text-decoration:none;transition:all .2s;display:inline-flex}.open-drive-btn:hover{background:#3367d6;transform:translateY(-2px);box-shadow:0 8px 20px #4285f44d}@media (max-width:640px){.container{padding:1rem}.title{font-size:1.75rem}.card{gap:1rem;padding:1.25rem 1.5rem}.card-icon{width:48px;height:48px}.card-title{font-size:1rem}.viewer-header{flex-wrap:wrap}.viewer-title{order:-1;width:100%;margin-bottom:.5rem}.external-link{padding:.6rem 1rem;font-size:.85rem}}