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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    background: var(--surface-color);
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.breadcrumb {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.breadcrumb-item {
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 14px;
}

.breadcrumb-item:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    margin-left: 8px;
    color: var(--text-secondary);
}

.breadcrumb-item.active {
    color: var(--primary-color);
    font-weight: 500;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: var(--danger-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.btn-secondary {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.loading {
    color: var(--text-secondary);
    font-size: 14px;
}

.file-list {
    background: var(--surface-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.file-item {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s;
    cursor: pointer;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background: var(--surface-hover);
}

.file-icon {
    font-size: 24px;
    margin-right: 16px;
    width: 32px;
    text-align: center;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    word-break: break-all;
}

.file-meta {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    gap: 16px;
}

.file-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.file-item:hover .file-actions {
    opacity: 1;
}

.btn-icon {
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: var(--surface-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.empty-state {
    padding: 60px 20px;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 16px;
}

.folder-item {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s;
    cursor: pointer;
}

.folder-item:hover {
    background: var(--surface-hover);
}

.folder-icon {
    font-size: 24px;
    margin-right: 16px;
    width: 32px;
    text-align: center;
}

.folder-name {
    font-weight: 500;
    color: var(--text-primary);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--surface-color);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="file"] {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 14px;
}

.form-group input[type="file"] {
    cursor: pointer;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

#uploadStatus {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--surface-color);
    color: var(--text-primary);
    padding: 14px 20px;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 2000;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease-out;
    border: 1px solid var(--border-color);
    font-size: 14px;
    max-width: 300px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .file-item,
    .folder-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .file-actions {
        opacity: 1;
        width: 100%;
        justify-content: flex-end;
    }

    .file-meta {
        flex-direction: column;
        gap: 4px;
    }

    .modal-content {
        width: 95%;
        margin: 20px;
    }

    .toast {
        right: 12px;
        bottom: 12px;
        left: 12px;
        max-width: none;
    }
}