:root {
    --primary: #3b82f6;
    --bg-app: #f1f5f9;
    --sidebar: #ffffff;
    --text-main: #1e293b;
}

body { font-family: 'Inter', sans-serif; background: var(--bg-app); margin: 0; display: flex; height: 100vh; }

/* Sidebar */
.sidebar { width: 260px; background: var(--sidebar); border-right: 1px solid #e2e8f0; padding: 20px; display: flex; flex-direction: column; }
.logo { font-size: 1.5rem; font-weight: bold; color: var(--primary); margin-bottom: 30px; display: flex; align-items: center; gap: 10px; }

/* Main Content */
.main-content { flex: 1; padding: 30px; overflow-y: auto; }
.header-actions { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }

/* File Grid */
.file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 20px; }
.file-card { background: white; padding: 15px; border-radius: 12px; border: 1px solid #e2e8f0; text-align: center; transition: 0.2s; position: relative; }
.file-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.file-icon { font-size: 3rem; margin-bottom: 10px; display: block; }
.file-name { font-size: 0.9rem; font-weight: 600; color: var(--text-main); word-break: break-all; }
.file-size { font-size: 0.75rem; color: #64748b; }

/* Modal */
.upload-btn { background: var(--primary); color: white; border: none; padding: 10px 20px; border-radius: 8px; cursor: pointer; font-weight: 600; }
.delete-btn { position: absolute; top: 5px; right: 5px; background: #fee2e2; color: #ef4444; border: none; border-radius: 50%; width: 25px; height: 25px; cursor: pointer; font-size: 12px; }

input[type="text"] { padding: 10px; border-radius: 8px; border: 1px solid #cbd5e1; width: 300px; }