/* CSS Design System & Visual Aesthetics for Personal Cloud */

:root {
    --bg-primary: #0a0f1d;
    --bg-sidebar: #0e1526;
    --bg-secondary: #161f33;
    --bg-hover: #1e2942;
    --bg-input: #111827;
    
    --accent: #6366f1;
    --accent-dark: #4f46e5;
    --accent-gradient: linear-gradient(135deg, #818cf8, #4f46e5);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --border: #232d45;
    --border-hover: #374766;
    --border-focus: #6366f1;
    
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.25);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.hidden {
    display: none !important;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-hover);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.btn-icon:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* Inputs */
.form-input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    transition: all var(--transition-fast);
}
.form-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.password-input-wrapper {
    position: relative;
    width: 100%;
}
.password-input-wrapper .form-input {
    padding-right: 48px;
}
.toggle-password-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.toggle-password-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}


/* Form Group */
.form-group {
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Auth Section */
.auth-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    width: 100%;
    background-color: var(--bg-primary);
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(79, 70, 229, 0.08) 0px, transparent 50%);
    position: relative;
    overflow: hidden;
}
.auth-wrapper::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(var(--accent) 0%, transparent 70%);
    border-radius: 50%;
    top: 15%;
    left: 20%;
    opacity: 0.15;
    filter: blur(50px);
    z-index: 1;
    animation: floatBlob 10s infinite alternate ease-in-out;
}
.auth-wrapper::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(var(--accent-dark) 0%, transparent 70%);
    border-radius: 50%;
    bottom: 10%;
    right: 15%;
    opacity: 0.12;
    filter: blur(60px);
    z-index: 1;
    animation: floatBlob 15s infinite alternate-reverse ease-in-out;
}
@keyframes floatBlob {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(60px, -60px) scale(1.15); }
}
.auth-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    border-radius: var(--radius-lg);
    background-color: rgba(14, 21, 38, 0.75);
    border: 1px solid var(--border);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    animation: zoomIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 10;
    transition: all var(--transition-normal);
}
.auth-card:focus-within {
    border-color: rgba(99, 102, 241, 0.45);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.15);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}
.cloud-logo {
    color: var(--accent);
    margin-bottom: 16px;
}
.auth-header h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}
.auth-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}
.auth-card button {
    width: 100%;
    margin-top: 10px;
}
.auth-error {
    margin-top: 16px;
    padding: 12px;
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: var(--danger);
    border-radius: var(--radius-md);
    font-size: 13px;
    text-align: center;
}

/* Layout */
.app-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}
.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}
.logo svg {
    color: var(--accent);
}
.sidebar-nav {
    padding: 20px 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
}
.nav-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}
.nav-item.active {
    background-color: rgba(99, 102, 241, 0.15);
    color: var(--accent);
}
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: rgba(10, 15, 29, 0.4);
}
.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
}
.avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}
.user-info {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.user-info .username {
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.user-info .user-role {
    font-size: 11px;
    color: var(--text-secondary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* Top Header */
.top-header {
    height: 72px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    background-color: rgba(10, 15, 29, 0.3);
}
.search-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    width: 320px;
    transition: all var(--transition-fast);
}
.search-bar:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    width: 380px;
}
.search-bar svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}
.search-bar input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    width: 100%;
}
.search-bar input::placeholder {
    color: var(--text-secondary);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Explorer Layout */
.explorer {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
    position: relative;
    display: flex;
    flex-direction: column;
}
.explorer-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    border-bottom: 1px solid rgba(35, 45, 69, 0.4);
    padding-bottom: 16px;
}
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
}
.breadcrumb-item {
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
}
.breadcrumb-item:hover {
    color: var(--text-primary);
}
.breadcrumb-item:last-child {
    color: var(--text-primary);
    cursor: default;
    pointer-events: none;
}
.breadcrumb-separator {
    color: var(--text-muted);
}

/* Explorer Grid/List Views */
.explorer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
}
.explorer-grid.list-view {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* File / Folder Card */
.explorer-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: all var(--transition-normal);
}
.explorer-item:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.explorer-item:active {
    transform: translateY(0);
}
.item-icon {
    font-size: 40px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 52px;
    color: var(--text-secondary);
}
.explorer-item[data-type="folder"] .item-icon {
    color: #f59e0b; /* Golden folder */
}
.explorer-item[data-type="file"] .item-icon {
    color: var(--accent); /* Indigo file */
}
.item-name {
    font-size: 13px;
    font-weight: 500;
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
}
.item-meta {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 4px;
}
.item-options-trigger {
    position: absolute;
    top: 8px;
    right: 8px;
    opacity: 0;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    padding: 2px;
    transition: opacity var(--transition-fast), background var(--transition-fast);
}
.explorer-item:hover .item-options-trigger,
.item-options-trigger:focus {
    opacity: 1;
}
.item-options-trigger:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

/* List View Specific Card Styles */
.explorer-grid.list-view .explorer-item {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    padding: 10px 16px;
    text-align: left;
}
.explorer-grid.list-view .item-icon {
    font-size: 24px;
    margin-bottom: 0;
    margin-right: 16px;
    height: 24px;
}
.explorer-grid.list-view .item-name {
    flex: 1;
}
.explorer-grid.list-view .item-meta {
    margin-top: 0;
    margin-left: 20px;
    font-size: 13px;
    width: 120px;
    text-align: right;
}
.explorer-grid.list-view .item-options-trigger {
    position: relative;
    top: auto;
    right: auto;
    opacity: 1;
    margin-left: 16px;
}

/* Drag & Drop Dropzone Overlay */
.explorer.dragover .drag-overlay {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}
.drag-overlay {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    background-color: rgba(14, 21, 38, 0.95);
    border: 2px dashed var(--accent);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.98);
    transition: all var(--transition-normal);
    z-index: 100;
}
.drag-content {
    text-align: center;
    color: var(--accent);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}
.drag-content h2 {
    font-size: 20px;
    font-weight: 600;
}
.drag-content p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 16px;
    padding: 80px 20px;
    color: var(--text-secondary);
    flex: 1;
}
.empty-state svg {
    color: var(--text-muted);
}
.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}
.empty-state p {
    font-size: 14px;
    max-width: 300px;
}

/* Floating Upload Tray */
.upload-tray {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 360px;
    max-height: 400px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}
.tray-header {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    background-color: rgba(14, 21, 38, 0.5);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.tray-header h3 {
    font-size: 14px;
    font-weight: 600;
}
.tray-body {
    flex: 1;
    overflow-y: auto;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.tray-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.tray-item-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
}
.tray-item-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 70%;
}
.tray-item-pct {
    color: var(--text-secondary);
}
.tray-progress-bar {
    height: 4px;
    background-color: var(--bg-hover);
    border-radius: var(--radius-full);
    overflow: hidden;
}
.tray-progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    width: 0%;
    transition: width 0.1s ease;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 6px 0;
    z-index: 9999;
    min-width: 160px;
    animation: scaleIn var(--transition-fast) forwards;
}
.context-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.context-item svg {
    flex-shrink: 0;
}
.context-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}
.context-item.danger {
    color: var(--danger);
}
.context-item.danger:hover {
    background-color: rgba(239, 68, 68, 0.1);
}
.context-divider {
    height: 1px;
    background-color: var(--border);
    margin: 4px 0;
}

/* Modals & Dialogs */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 5000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    animation: zoomIn 0.25s ease;
    overflow: hidden;
}
.modal-card.preview-card {
    max-width: 800px;
    height: 85vh;
}
.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-header h2 {
    font-size: 16px;
    font-weight: 600;
}
.preview-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}
.modal-body {
    padding: 24px;
}
.preview-body {
    flex: 1;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #04060c;
    padding: 0;
}
.preview-body img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}
.preview-body video,
.preview-body audio {
    width: 100%;
    max-height: 100%;
}
.preview-pdf, .preview-text {
    width: 100%;
    height: 100%;
    border: none;
    background-color: transparent;
    color: var(--text-primary);
    padding: 20px;
    font-family: monospace;
    font-size: 13px;
    white-space: pre-wrap;
    overflow: auto;
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    background-color: rgba(14, 21, 38, 0.4);
}
.share-url-container {
    margin-top: 16px;
    display: flex;
    gap: 8px;
    animation: fadeIn var(--transition-fast) forwards;
}
.share-url-container input {
    flex: 1;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    font-size: 13px;
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 250px;
    animation: slideInLeft 0.3s ease, fadeOut 0.3s ease 3.7s forwards;
}
.toast-success { border-left: 4px solid var(--success); }
.toast-error { border-left: 4px solid var(--danger); }
.toast-info { border-left: 4px solid var(--accent); }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes zoomIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
@keyframes scaleIn {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
@keyframes slideInLeft {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes fadeOut {
    to { opacity: 0; transform: translateY(-10px); }
}

/* Mobile Toggle Utilities */
.mobile-only {
    display: none !important;
}

.sidebar-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(4, 6, 12, 0.65);
    backdrop-filter: blur(4px);
    z-index: 1500;
    transition: opacity var(--transition-normal);
}

/* Media Queries */
@media (max-width: 768px) {
    .mobile-only {
        display: inline-flex !important;
    }
    
    /* Responsive Header elements hiding text */
    #new-folder-btn span,
    #upload-label span {
        display: none;
    }
    
    .btn {
        padding: 8px 12px;
        height: 38px;
    }
    
    .sidebar-backdrop {
        display: block;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 2000;
        width: 280px;
        transform: translateX(-100%);
        transition: transform var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
        display: flex;
    }
    .sidebar.active {
        transform: translateX(0);
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
    }
    
    .sidebar-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: 20px;
    }
    
    .top-header {
        padding: 0 16px;
        gap: 12px;
    }
    .search-bar {
        flex: 1;
        width: auto;
    }
    .search-bar:focus-within {
        width: auto;
        flex: 1.5;
    }
    .explorer {
        padding: 16px;
    }
    .upload-tray {
        width: calc(100vw - 32px);
        left: 16px;
        right: 16px;
        bottom: 16px;
    }
    .modal-card {
        width: 95%;
    }
}