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

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d2e;
    --bg-card: #1e2235;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0b0;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --accent-glow: rgba(245, 158, 11, 0.15);
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #22c55e;
    --info: #3b82f6;
    --border: #2a2f45;
    --border-light: #353b55;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius: 10px;
    --radius-sm: 6px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.view { min-height: 100vh; }
.page { padding: 24px; }

/* ─── Auth ─── */
.auth-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #16192a 100%);
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 48px 40px;
    width: 400px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    animation: fadeSlideUp 0.4s ease-out;
}

.auth-logo {
    font-size: 56px;
    margin-bottom: 8px;
    animation: bounce 2s ease-in-out infinite;
}

.brand {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, #fbbf24 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 14px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.input-group {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
    opacity: 0.6;
    transition: opacity 0.2s;
    z-index: 2;
}

.toggle-password:hover {
    opacity: 1;
}

.input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    z-index: 1;
    pointer-events: none;
}

.auth-form input,
.input-group input {
    padding: 12px 40px 12px 42px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 15px;
    width: 100%;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.auth-form input:focus,
.input-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.auth-buttons {
    display: flex;
    gap: 12px;
    margin-top: 4px;
}

.auth-toggle {
    text-align: center;
    margin-top: 16px;
}

.auth-toggle a {
    color: var(--accent);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.auth-toggle a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.error {
    color: var(--danger);
    font-size: 13px;
    min-height: 20px;
    text-align: left;
}

/* ─── Buttons ─── */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #fbbf24 100%);
    color: #000;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.25);
}

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
    filter: brightness(1.05);
}

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

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

.btn-sm {
    padding: 7px 14px;
    font-size: 13px;
}

.btn-danger {
    background: var(--danger);
    color: white;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.25);
}

.btn-danger:hover {
    background: var(--danger-hover);
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.35);
}

/* ─── Navbar ─── */
.navbar {
    display: flex;
    align-items: center;
    padding: 0 24px;
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-brand {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, #fbbf24 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-right: 40px;
}

.nav-links {
    display: flex;
    gap: 4px;
    flex: 1;
}

.nav-link {
    padding: 8px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-size: 14px;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--accent);
    background: var(--accent-glow);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

#nav-user {
    color: var(--text-secondary);
    font-size: 14px;
}

.admin-only {
    display: none;
}

.is-admin .admin-only {
    display: block;
}

/* ─── VIP Badge ─── */
.vip-badge {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #000;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
}

/* ─── Search Bar ─── */
.search-bar {
    display: flex;
    align-items: center;
    gap: 6px;
}

.search-bar input {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 13px;
    width: 200px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── File List ─── */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
}

.crumb {
    cursor: pointer;
    color: var(--accent);
    transition: color var(--transition);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
}

.crumb:hover {
    color: var(--accent-hover);
    background: var(--accent-glow);
}

.page-actions {
    display: flex;
    gap: 8px;
}

.file-list {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-card);
    box-shadow: var(--shadow);
}

.file-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    position: relative;
}

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

.file-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.file-item:active {
    transform: scale(0.998);
}

.file-item.selected {
    background: rgba(245, 158, 11, 0.1);
    border-left: 3px solid var(--accent);
}

.file-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    text-align: center;
    font-size: 18px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    flex-shrink: 0;
}

.file-name {
    flex: 1;
    font-size: 14px;
    font-weight: 450;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    color: var(--text-secondary);
    font-size: 12px;
    width: 90px;
    text-align: right;
    flex-shrink: 0;
}

.file-actions {
    display: flex;
    gap: 2px;
    margin-left: 12px;
    opacity: 0;
    transition: opacity var(--transition);
    flex-shrink: 0;
}

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

.file-action {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    transition: all var(--transition);
    white-space: nowrap;
}

.file-action:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--accent);
}

/* ─── Batch Actions ─── */
.batch-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    margin-bottom: 12px;
}

.batch-actions span {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
}

/* ─── Filter Bar ─── */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-right: 4px;
}

.filter-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 14px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.filter-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ─── Storage Bar ─── */
.storage-bar {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    margin-bottom: 12px;
    position: relative;
    overflow: hidden;
}

.storage-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, #fbbf24 100%);
    width: 0%;
    transition: width 0.3s ease-out;
    border-radius: 3px;
}

.storage-fill.warning {
    background: linear-gradient(90deg, var(--danger) 0%, #f87171 100%);
}

.storage-text {
    position: absolute;
    right: 8px;
    top: -18px;
    font-size: 11px;
    color: var(--text-secondary);
}

/* ─── Empty State ─── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    animation: fadeSlideUp 0.3s ease-out;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.8;
}

.empty-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

/* ─── Drop Zone ─── */
.drop-zone {
    position: relative;
    min-height: 400px;
}

.drop-overlay {
    display: none;
    position: absolute;
    inset: 0;
    background: rgba(245, 158, 11, 0.08);
    border: 2px dashed var(--accent);
    border-radius: var(--radius);
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--accent);
    z-index: 10;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

.drop-zone.dragover .drop-overlay {
    display: flex;
}

/* ─── Progress ─── */
.progress-bar {
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    margin-top: 12px;
    overflow: visible;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, #fbbf24 100%);
    width: 0%;
    transition: width 0.3s ease-out;
    border-radius: 2px;
    animation: progress-pulse 1.5s ease-in-out infinite;
}

@keyframes progress-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.progress-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

#upload-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}


/* ─── Transfer List ─── */
.transfer-list { padding: 8px 0; }
.transfer-item { padding: 12px 16px; border-bottom: 1px solid var(--border); transition: background var(--transition); }
.transfer-item:hover { background: var(--bg-secondary); }
.transfer-item:last-child { border-bottom: none; }
.transfer-info { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.transfer-name { font-size: 14px; color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.transfer-status { font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 4px; white-space: nowrap; }
.transfer-status.status-active { color: var(--accent); background: var(--accent-glow); }
.transfer-status.status-done { color: var(--success); background: rgba(34,197,94,0.15); }
.transfer-status.status-error { color: var(--danger); background: rgba(239,68,68,0.15); }
.transfer-bar { height: 3px; background: var(--bg-secondary); border-radius: 2px; margin-top: 8px; overflow: hidden; }
.transfer-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-hover)); border-radius: 2px; transition: width 0.3s; }
.transfer-meta { font-size: 11px; color: var(--text-secondary); margin-top: 4px; }

/* ─── Shares ─── */
.shares-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.share-item {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.share-item:hover {
    border-color: var(--border-light);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

.share-name {
    font-weight: 500;
    margin-bottom: 4px;
    font-size: 14px;
}

.share-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ─── Settings ─── */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.settings-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: border-color var(--transition);
}

.settings-section:hover {
    border-color: var(--border-light);
}

.settings-section h3 {
    margin-bottom: 20px;
    color: var(--accent);
    font-size: 16px;
    font-weight: 600;
}

.collapse-arrow {
    font-size: 12px;
    transition: transform 0.2s;
    display: inline-block;
    margin-left: 6px;
}

.collapse-arrow.collapsed {
    transform: rotate(-90deg);
}

.collapse-content {
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.collapse-content.collapsed {
    max-height: 0 !important;
    padding-top: 0 !important;
}

.collapsible h3:hover {
    opacity: 0.8;
}

.collapsible h3 {
    margin-bottom: 4px !important;
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input[readonly] {
    opacity: 0.6;
    cursor: not-allowed;
}

.account-subsection {
    padding: 16px 0;
    border-top: 1px solid var(--border);
}

.account-subsection h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.form-msg {
    margin-top: 8px;
    font-size: 13px;
    min-height: 20px;
}

.form-msg.msg-success {
    color: var(--success, #22c55e);
}

.form-msg.msg-error {
    color: var(--danger, #ef4444);
}

.add-user-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.add-user-form input[type="text"],
.add-user-form input[type="password"],
.add-user-form input[type="number"] {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.add-user-form input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.user-row {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.user-row:last-child {
    border-bottom: none;
}

.user-info {
    flex: 1;
    font-size: 14px;
}

.user-badge {
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent) 0%, #fbbf24 100%);
    color: #000;
    margin-left: 8px;
    font-weight: 600;
}

.user-vip-badge {
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 12px;
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #000;
    margin-left: 4px;
    font-weight: 600;
}

/* ─── Invite Codes ─── */
.invite-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 12px;
}

.invite-code-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

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

.invite-code {
    font-family: monospace;
    background: var(--bg-primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

/* ─── Login History ─── */
.login-history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 12px;
}

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

.login-success {
    color: var(--success);
}

.login-failed {
    color: var(--danger);
}

/* ─── Dashboard ─── */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.dashboard-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.dashboard-card h4 {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
}

.dashboard-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
}

.dashboard-sub {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ─── Modal ─── */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 0;
    min-width: 380px;
    max-width: 520px;
    box-shadow: var(--shadow-lg);
    animation: fadeSlideUp 0.25s ease-out;
    overflow: hidden;
}

.modal-content.modal-sm {
    min-width: 340px;
    max-width: 400px;
}

.modal-content.modal-lg {
    min-width: 500px;
    max-width: 700px;
    width: 90vw;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
}

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 22px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    line-height: 1;
}

.modal-close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.modal-content > input,
.modal-content > .form-group,
.modal-content > .share-file-label {
    margin: 0 24px;
}

.modal-content > input:first-of-type {
    margin-top: 16px;
}

.modal-content > input {
    width: calc(100% - 48px);
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.modal-content > input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.share-file-label {
    color: var(--text-secondary);
    font-size: 13px;
    padding: 12px 0 4px 0;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.1);
}

/* ─── Preview ─── */
.preview-body {
    padding: 20px 24px;
    min-height: 200px;
    max-height: 60vh;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-image {
    max-width: 100%;
    max-height: 55vh;
    border-radius: var(--radius);
    object-fit: contain;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.preview-code {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-primary);
    overflow: auto;
    max-height: 55vh;
    white-space: pre-wrap;
    word-break: break-all;
    tab-size: 4;
}

.preview-error {
    color: var(--danger);
    font-size: 14px;
    text-align: center;
    padding: 20px;
}

.file-info-preview {
    text-align: center;
    padding: 20px;
}

.file-info-icon {
    font-size: 64px;
    margin-bottom: 12px;
}

.file-info-type {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.file-info-ext {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.file-info-size {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 12px;
}

.file-info-hint {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    display: inline-block;
}

/* ─── Audio/Video Preview ─── */
.preview-audio,
.preview-video {
    width: 100%;
    max-width: 100%;
}

.preview-video {
    max-height: 55vh;
    border-radius: var(--radius);
}

/* ─── Editor ─── */
.editor-body {
    padding: 16px 24px;
}

.editor-textarea {
    width: 100%;
    min-height: 400px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.6;
    resize: vertical;
    tab-size: 4;
}

.editor-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── Move Tree ─── */
.move-tree {
    padding: 16px 24px;
    max-height: 400px;
    overflow-y: auto;
}

.tree-item {
    padding: 8px 12px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.tree-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.tree-item.selected {
    background: var(--accent-glow);
    color: var(--accent);
}

.tree-item .tree-icon {
    font-size: 16px;
}

.tree-children {
    margin-left: 24px;
}

/* ─── Delete Confirmation ─── */
.delete-confirm-body {
    text-align: center;
    padding: 24px;
}

.delete-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.delete-confirm-body p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 8px;
}

.delete-filename {
    font-weight: 600;
    color: var(--text-primary) !important;
    font-size: 15px !important;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    display: inline-block;
    margin: 8px 0 !important;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.delete-warning {
    color: var(--text-secondary) !important;
    font-size: 12px !important;
}

/* ─── Loading Spinner ─── */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 14px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ─── Recycle Item ─── */
.recycle-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
}

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

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

.recycle-name {
    font-size: 14px;
    font-weight: 450;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.recycle-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

.recycle-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

/* ─── Animations ─── */
@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.modal-enter {
    animation: fadeIn 0.2s ease-out;
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .auth-card {
        width: calc(100vw - 32px);
        padding: 32px 24px;
        max-width: 400px;
    }

    .auth-logo {
        font-size: 44px;
    }

    .brand {
        font-size: 26px;
    }

    .navbar {
        flex-wrap: wrap;
        height: auto;
        padding: 8px 10px;
        gap: 4px;
    }

    .nav-brand {
        font-size: 15px;
        margin-right: 8px;
    }

    .nav-links {
        order: 3;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 1px;
        padding: 2px 0;
    }

    .nav-links::-webkit-scrollbar {
        height: 2px;
    }

    .nav-link {
        font-size: 12px;
        padding: 5px 10px;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .nav-right {
        width: 100%;
        justify-content: flex-start;
        gap: 4px;
        flex-wrap: wrap;
    }

    .search-bar {
        flex: 1;
        min-width: 0;
    }

    .search-bar input {
        flex: 1;
        width: auto;
        font-size: 13px;
        padding: 5px 10px;
        min-width: 60px;
    }

    .search-bar .btn-sm {
        font-size: 12px;
        padding: 5px 8px;
    }

    #nav-user {
        font-size: 11px;
        white-space: nowrap;
        max-width: 70px;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    #btn-activate-vip {
        font-size: 11px;
        padding: 3px 6px;
        white-space: nowrap;
    }

    .vip-badge {
        font-size: 10px;
        padding: 1px 6px;
    }

    #btn-logout {
        font-size: 11px;
        padding: 3px 8px;
    }

    .page {
        padding: 12px;
    }

    .page-header {
        flex-wrap: wrap;
        gap: 8px;
    }

    .page-header h2 {
        font-size: 16px;
    }

    .page-actions {
        flex-wrap: wrap;
        gap: 4px;
    }

    .page-actions .btn,
    .page-actions .btn-sm {
        font-size: 12px;
        padding: 5px 8px;
        white-space: nowrap;
    }

    .breadcrumb {
        font-size: 13px;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
        padding-bottom: 4px;
    }

    .file-item {
        padding: 10px 12px;
        flex-wrap: wrap;
    }

    .file-icon {
        width: 32px;
        height: 32px;
        font-size: 15px;
        margin-right: 8px;
    }

    .file-name {
        font-size: 13px;
        min-width: 0;
        max-width: calc(100% - 100px);
    }

    .file-size {
        width: auto;
        font-size: 11px;
        margin-left: auto;
    }

    .file-actions {
        opacity: 1;
        width: 100%;
        margin-left: 0;
        margin-top: 6px;
        padding-top: 6px;
        border-top: 1px solid var(--border);
        display: flex;
        flex-direction: row;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 2px;
        scrollbar-width: none;
    }

    .file-actions::-webkit-scrollbar {
        display: none;
    }

    .file-action {
        font-size: 11px;
        padding: 6px 8px;
        white-space: nowrap;
        flex-shrink: 0;
        display: inline-flex;
        align-items: center;
        gap: 3px;
        min-height: 32px;
    }

    .file-action .action-text {
        display: none;
    }

    .file-action .action-icon {
        font-size: 16px;
    }

    .settings-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .settings-section {
        padding: 16px;
    }

    .settings-section h3 {
        font-size: 15px;
    }

    .modal-content,
    .modal-content.modal-sm,
    .modal-content.modal-lg {
        min-width: unset;
        width: calc(100vw - 24px);
        max-width: 100vw;
        margin: 12px;
        border-radius: 12px;
    }

    .modal-header {
        padding: 14px 16px;
    }

    .modal-header h3 {
        font-size: 15px;
    }

    .modal-actions {
        padding: 12px 16px;
        flex-wrap: wrap;
    }

    .modal-actions .btn {
        flex: 1;
        min-width: 80px;
        font-size: 13px;
    }

    .modal-content > input {
        width: calc(100% - 32px);
        margin: 0 16px;
        font-size: 16px; /* prevent iOS zoom */
    }

    .modal-content .form-group {
        margin: 0 16px 14px;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .dashboard-card {
        padding: 16px;
    }

    .dashboard-value {
        font-size: 22px;
    }

    .batch-actions {
        flex-wrap: wrap;
        gap: 8px;
        padding: 10px 12px;
    }

    .batch-actions .btn {
        font-size: 12px;
        padding: 5px 10px;
    }

    .share-item {
        padding: 12px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .share-info {
        min-width: 0;
        flex: 1 1 100%;
    }

    .recycle-item {
        padding: 10px 12px;
        flex-wrap: wrap;
        gap: 6px;
    }

    .recycle-actions {
        width: 100%;
        justify-content: flex-end;
        padding-top: 6px;
        border-top: 1px solid var(--border);
    }

    .invite-actions {
        flex-wrap: wrap;
    }

    .add-user-form {
        gap: 8px;
    }

    .user-row {
        flex-wrap: wrap;
        gap: 4px;
    }

    .user-badge, .user-vip-badge {
        font-size: 10px;
        padding: 1px 7px;
    }

    .preview-body {
        padding: 12px 16px;
        max-height: 50vh;
    }

    .editor-textarea {
        min-height: 250px;
        font-size: 14px;
    }

    .move-tree {
        padding: 12px 16px;
        max-height: 300px;
    }

    .delete-confirm-body {
        padding: 16px;
    }

    .delete-icon {
        font-size: 40px;
    }

    .empty-state {
        padding: 40px 16px;
    }

    .empty-icon {
        font-size: 48px;
    }

    .login-history-item {
        flex-wrap: wrap;
        gap: 4px;
        font-size: 11px;
    }

    .storage-text {
        font-size: 10px;
    }

    .drop-zone {
        min-height: 200px;
    }

    .drop-overlay {
        font-size: 16px;
    }
}

/* Small phones */
@media (max-width: 420px) {
    .auth-card {
        padding: 24px 16px;
    }

    .auth-form input,
    .input-group input {
        font-size: 16px; /* prevent iOS zoom on focus */
        padding: 11px 40px 11px 38px;
    }

    .btn {
        padding: 10px 16px;
        font-size: 14px;
    }

    .auth-buttons .btn {
        flex: 1;
    }

    .file-icon {
        width: 28px;
        height: 28px;
        font-size: 13px;
    }

    .file-name {
        font-size: 12px;
    }

    .page {
        padding: 8px;
    }

    .settings-section {
        padding: 12px;
    }

    .modal-content > input {
        font-size: 16px;
    }

    .modal-actions .btn {
        padding: 10px 12px;
        font-size: 13px;
    }

    #nav-user {
        max-width: 80px;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .btn-logout {
        font-size: 12px;
        padding: 5px 10px;
    }
}

/* Tablet */
@media (min-width: 769px) and (max-width: 1024px) {
    .settings-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .auth-card {
        width: 380px;
    }

    .modal-content.modal-lg {
        max-width: 85vw;
    }
}
/* ---- View Toggle ---- */
.view-toggle {
    display: flex;
    gap: 2px;
    align-items: center;
    margin-right: 8px;
    border-right: 1px solid var(--border);
    padding-right: 8px;
}

.view-btn {
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 7px;
    transition: all var(--transition);
    opacity: 0.5;
    line-height: 1;
}

.view-btn:hover {
    opacity: 0.8;
    background: rgba(255, 255, 255, 0.05);
}

.view-btn.active {
    opacity: 1;
    background: var(--accent-glow);
    border-color: var(--accent);
}

/* ---- Grid View ---- */
.file-list.view-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 12px;
    border: none;
    background: none;
    box-shadow: none;
}

.file-grid-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 8px 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.file-grid-item:hover {
    border-color: var(--accent);
    background: rgba(245, 158, 11, 0.05);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.15);
}

.file-grid-item.selected {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--accent);
}

.file-grid-item .file-icon {
    width: 56px;
    height: 56px;
    font-size: 32px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    margin: 0 0 8px 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-grid-item .file-name {
    font-size: 12px;
    text-align: center;
    max-width: 100%;
    word-break: break-all;
    line-height: 1.3;
    max-height: 2.6em;
    overflow: hidden;
}

.file-grid-item .file-size,
.file-grid-item .file-date {
    display: none;
}

/* ---- Compact View ---- */
.file-list.view-compact {
    border: none;
    background: none;
    box-shadow: none;
    gap: 2px;
}

.file-compact-item {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    margin-bottom: 2px;
}

.file-compact-item:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--border-light);
}

.file-compact-item.selected {
    background: rgba(245, 158, 11, 0.1);
    border-left: 3px solid var(--accent);
}

.file-compact-item .file-icon {
    width: 24px;
    height: 24px;
    font-size: 14px;
    margin-right: 10px;
    background: none;
    flex-shrink: 0;
}

.file-compact-item .file-name {
    font-size: 13px;
}

.file-compact-item .file-size {
    font-size: 11px;
    width: auto;
    color: var(--text-secondary);
}

.file-compact-item .file-date {
    display: none;
}

.file-compact-item .file-actions {
    margin-left: 8px;
    opacity: 0;
}

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

/* ---- List View with Date column ---- */
.file-date {
    color: var(--text-secondary);
    font-size: 12px;
    width: 140px;
    flex-shrink: 0;
    text-align: left;
}



/* ---- Grid View Thumbnails ---- */
.file-thumb {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    margin-bottom: 6px;
    position: relative;
}

.file-thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

.file-grid-item .file-thumb {
    width: 100%;
    margin: 0 0 6px 0;
}

.video-play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    pointer-events: none;
}

.file-grid-item .file-icon {
    width: 56px;
    height: 56px;
    font-size: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---- Compact View Actions Bar ---- */
.file-actions-bar {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease-out;
}

.file-actions-bar.show {
    opacity: 1;
}

.file-actions-inner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px 16px 0 0;
    padding: 16px 20px 28px;
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.file-actions-bar.show .file-actions-inner {
    transform: translateY(0);
}

/* Preview area inside action sheet */
.file-actions-preview {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    min-height: 150px;
    max-height: 40vh;
    overflow: hidden;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.2);
}

.file-actions-preview-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    max-height: 40vh;
    border-radius: 12px;
}

.file-actions-preview-icon {
    font-size: 64px;
    opacity: 0.8;
}

.file-actions-info {
    text-align: center;
    margin-bottom: 14px;
}

.file-actions-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
    line-height: 1.3;
}

.file-actions-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.file-actions-btns {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.file-actions-btns .file-action {
    padding: 12px 8px;
    font-size: 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.file-actions-btns .file-action:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--accent);
}

.file-actions-btns .file-action .action-text {
    display: inline;
}

@media (max-width: 768px) {
    .file-actions-inner {
        padding: 12px 16px 24px;
    }
    .file-actions-preview {
        min-height: 120px;
        max-height: 30vh;
    }
    .file-actions-preview-icon {
        font-size: 48px;
    }
    .file-actions-btns {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }
    .file-actions-btns .file-action {
        padding: 10px 4px;
        font-size: 12px;
    }
}


/* ====== Theme Definitions ====== */
[data-theme="dark-orange"] { --bg-primary: #0f1117; --bg-secondary: #141829; --bg-card: #1a2035; --accent: #f59e0b; --accent-hover: #d97706; --accent-glow: rgba(245,158,11,0.15); --border: #252d45; }
[data-theme="dark-purple"] { --bg-primary: #0d0815; --bg-secondary: #150e25; --bg-card: #1e1435; --accent: #a855f7; --accent-hover: #9333ea; --accent-glow: rgba(168,85,247,0.2); --border: #2a1840; }
[data-theme="dark-blue"] { --bg-primary: #080c18; --bg-secondary: #0d1528; --bg-card: #121e38; --accent: #3b82f6; --accent-hover: #2563eb; --accent-glow: rgba(59,130,246,0.2); --border: #182845; }
[data-theme="dark-green"] { --bg-primary: #08120c; --bg-secondary: #0c1c12; --bg-card: #12281a; --accent: #22c55e; --accent-hover: #16a34a; --accent-glow: rgba(34,197,94,0.2); --border: #183520; }
[data-theme="sunset"] { --bg-primary: #150c08; --bg-secondary: #22120d; --bg-card: #301a14; --accent: #ff6b35; --accent-hover: #e55a2b; --accent-glow: rgba(255,107,53,0.2); --border: #3d2215; }
[data-theme="ocean"] { --bg-primary: #081218; --bg-secondary: #0c1a28; --bg-card: #102432; --accent: #00bcd4; --accent-hover: #0097a7; --accent-glow: rgba(0,188,212,0.2); --border: #153045; }
[data-theme="forest"] { --bg-primary: #08150c; --bg-secondary: #0c2212; --bg-card: #10301a; --accent: #4caf50; --accent-hover: #388e3c; --accent-glow: rgba(76,175,80,0.2); --border: #183d20; }
[data-theme="cherry"] { --bg-primary: #150812; --bg-secondary: #220c1c; --bg-card: #301028; --accent: #e91e63; --accent-hover: #c2185b; --accent-glow: rgba(233,30,99,0.2); --border: #3d1530; }
[data-theme="midnight"] { --bg-primary: #080812; --bg-secondary: #0c0c20; --bg-card: #10102a; --accent: #6366f1; --accent-hover: #4f46e5; --accent-glow: rgba(99,102,241,0.2); --border: #181838; }
[data-theme="lavender"] { --bg-primary: #120d18; --bg-secondary: #1a1222; --bg-card: #241830; --accent: #ab47bc; --accent-hover: #8e24aa; --accent-glow: rgba(171,71,188,0.2); --border: #2d1a3d; }
[data-theme="glass"] { --bg-primary: rgba(15,20,35,0.85); --bg-secondary: rgba(25,35,60,0.75); --bg-card: rgba(30,45,75,0.65); --accent: #60a5fa; --accent-hover: #3b82f6; --accent-glow: rgba(96,165,250,0.25); --border: rgba(255,255,255,0.12); }

/* ====== Glass Theme Blur Effects ====== */
[data-theme="glass"] .navbar,
[data-theme="glass"] .auth-card,
[data-theme="glass"] .settings-section,
[data-theme="glass"] .settings-card,
[data-theme="glass"] .file-item {
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
}

[data-theme="glass"] .auth-container {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
[data-theme="light-orange"] { --bg-primary: #faf5eb; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #f59e0b; --accent-hover: #d97706; --border: #e5d5c0; }
[data-theme="light-blue"] { --bg-primary: #f0f4ff; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #3b82f6; --accent-hover: #2563eb; --border: #c0d0e5; }
[data-theme="light-green"] { --bg-primary: #f0faf5; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #22c55e; --accent-hover: #16a34a; --border: #c0e5d0; }
[data-theme="light-pink"] { --bg-primary: #fff0f5; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #ec4899; --accent-hover: #db2777; --border: #e5c0d5; }
[data-theme="light-purple"] { --bg-primary: #f5f0ff; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #8b5cf6; --accent-hover: #7c3aed; --border: #d0c0e5; }
[data-theme="warm"] { --bg-primary: #fefce8; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #eab308; --accent-hover: #ca8a04; --border: #e5d5a0; }
[data-theme="light"] { --bg-primary: #f8f9fa; --bg-secondary: #ffffff; --bg-card: #ffffff; --text-primary: #1f2937; --text-secondary: #6b7280; --accent: #f59e0b; --accent-hover: #d97706; --border: #e5e7eb; }
[data-theme="cyberpunk"] { --bg-primary: #0a0a0f; --bg-secondary: #12121e; --bg-card: #1a1a2e; --accent: #ff00ff; --accent-hover: #cc00cc; --accent-glow: rgba(255,0,255,0.15); --border: #2a1a3e; }

/* ====== Theme Selector ====== */
.theme-selector { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.theme-option { display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; padding: 8px; border-radius: var(--radius); border: 2px solid transparent; transition: all var(--transition); background: none; color: var(--text-primary); font-size: 11px; }
.theme-option:hover { border-color: var(--border-light); }
.theme-option.active { border-color: var(--accent); background: var(--accent-glow); }
.theme-swatch { width: 36px; height: 36px; border-radius: 50%; border: 2px solid var(--border); }

/* ====== Animations ====== */
@keyframes fileItemIn { from { opacity: 0; transform: translateY(6px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes pageIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes crumbIn { from { opacity: 0; transform: translateX(-4px); } to { opacity: 1; transform: translateX(0); } }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.7; } }
.initial-render .file-item { animation: fileItemIn 0.3s ease-out both; }
.initial-render .file-item:nth-child(1) { animation-delay: 0.01s; }
.initial-render .file-item:nth-child(2) { animation-delay: 0.03s; }
.initial-render .file-item:nth-child(3) { animation-delay: 0.05s; }
.initial-render .file-item:nth-child(4) { animation-delay: 0.07s; }
.initial-render .file-item:nth-child(5) { animation-delay: 0.09s; }
.initial-render .file-item:nth-child(n+6) { animation-delay: 0.11s; }
.page { animation: pageIn 0.25s ease-out; }
.btn:active { transform: scale(0.96); }
.btn:hover { transform: translateY(-2px); }
.breadcrumb .crumb { animation: crumbIn 0.2s ease-out both; }
.vip-badge { animation: pulse 2s ease-in-out infinite; }
.nav-link { position: relative; }
.nav-link::after { content: ""; position: absolute; bottom: 2px; left: 50%; width: 0; height: 2px; background: var(--accent); border-radius: 1px; transition: all 0.25s ease; transform: translateX(-50%); }
.nav-link.active::after { width: 60%; }

/* ═══════════════════════════════════════════
   Liquid Glass Theme Overlay
   iOS 26 / macOS Tahoe 风格液态玻璃主题
   ═══════════════════════════════════════════ */

:root {
  --glass-bg: rgba(255, 255, 255, 0.12);
  --glass-bg-solid: rgba(255, 255, 255, 0.18);
  --glass-border: rgba(255, 255, 255, 0.25);
  --glass-highlight: rgba(255, 255, 255, 0.4);
  --glass-shadow: rgba(0, 0, 0, 0.08);
  --glass-blur: 20px;
  --glass-radius: 20px;
  --glass-radius-sm: 14px;
  --glass-radius-xs: 10px;
  --glass-saturate: 1.8;
}

/* Animated Background */
.bg-canvas {
  position: fixed; inset: 0; z-index: -1;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}
.bg-canvas::before {
  content: ''; position: absolute;
  width: 150%; height: 150%;
  top: -25%; left: -25%;
  background:
    radial-gradient(ellipse 600px 600px at 20% 30%, rgba(255,150,200,0.5) 0%, transparent 70%),
    radial-gradient(ellipse 500px 500px at 75% 60%, rgba(100,180,255,0.5) 0%, transparent 70%),
    radial-gradient(ellipse 400px 400px at 50% 80%, rgba(180,100,255,0.4) 0%, transparent 70%),
    radial-gradient(ellipse 350px 350px at 85% 20%, rgba(100,255,200,0.3) 0%, transparent 70%);
  animation: bgDrift 20s ease-in-out infinite alternate;
}
@keyframes bgDrift {
  0%   { transform: translate(0, 0) rotate(0deg) scale(1); }
  33%  { transform: translate(30px, -20px) rotate(2deg) scale(1.02); }
  66%  { transform: translate(-20px, 15px) rotate(-1deg) scale(0.98); }
  100% { transform: translate(10px, -10px) rotate(1deg) scale(1.01); }
}
.bg-orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
  animation: orbFloat 15s ease-in-out infinite alternate;
  will-change: transform, filter;
  transform: translateZ(0);
}
.bg-orb:nth-child(1) { width:500px; height:500px; background:rgba(255,100,150,0.4); top:10%; left:10%; }
.bg-orb:nth-child(2) { width:400px; height:400px; background:rgba(100,200,255,0.4); top:50%; right:10%; animation-delay:-5s; }
.bg-orb:nth-child(3) { width:350px; height:350px; background:rgba(200,100,255,0.3); bottom:10%; left:30%; animation-delay:-10s; }
@keyframes orbFloat {
  0%   { transform: translate(0,0) scale(1); }
  50%  { transform: translate(40px,-30px) scale(1.1); }
  100% { transform: translate(-20px,20px) scale(0.95); }
}

/* Liquid Glass Core */
.liquid-glass {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--glass-radius);
  box-shadow:
    0 8px 32px var(--glass-shadow),
    inset 0 1px 0 var(--glass-highlight),
    inset 0 -1px 0 rgba(255,255,255,0.05);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate)) brightness(1.05);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate)) brightness(1.05);
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              box-shadow 0.4s ease, background 0.4s ease;
  will-change: transform;
  transform: translateZ(0);
}
.liquid-glass::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.05) 40%, rgba(255,255,255,0) 60%, rgba(255,255,255,0.08) 100%);
  border-radius: inherit; pointer-events: none; z-index: 1;
}
.liquid-glass::after {
  content: ''; position: absolute; top: 0; left: 10%; right: 10%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
  border-radius: 1px; pointer-events: none; z-index: 2; opacity: 0.8;
}
.liquid-glass:hover {
  transform: translateZ(0) scale(0.985);
  box-shadow: 0 4px 16px var(--glass-shadow), inset 0 2px 0 var(--glass-highlight), inset 0 -1px 0 rgba(255,255,255,0.05);
}
.liquid-glass:active {
  transform: translateZ(0) scale(0.97);
  transition-duration: 0.1s;
}

/* Glass Refraction */
.glass-refraction {
  position: absolute; inset: 0; border-radius: inherit; pointer-events: none; z-index: 1;
  opacity: 0; transition: opacity 0.3s ease;
  background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.04) 30%, transparent 60%);
}
.liquid-glass:hover .glass-refraction { opacity: 1; }

/* Edge Glow */
.glass-edge-glow {
  position: absolute; inset: -1px; border-radius: inherit; pointer-events: none; z-index: 0;
  opacity: 0; transition: opacity 0.4s ease;
  background: conic-gradient(from var(--mouse-angle, 0deg) at var(--mouse-x, 50%) var(--mouse-y, 50%),
    transparent 0deg, rgba(255,255,255,0.15) 30deg, transparent 60deg, transparent 360deg);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude; -webkit-mask-composite: xor; padding: 1px;
}
.liquid-glass:hover .glass-edge-glow { opacity: 1; }

/* Scroll Shimmer */
.scroll-shimmer {
  position: absolute; inset: 0; border-radius: inherit; pointer-events: none; z-index: 2;
  background: linear-gradient(calc(135deg + var(--scroll-offset, 0deg)), transparent 30%, rgba(255,255,255,0.08) 50%, transparent 70%);
  opacity: 0; transition: opacity 0.3s ease;
}
.liquid-glass:hover .scroll-shimmer { opacity: 1; }

/* Dark Mode */
[data-theme="dark"] .liquid-glass {
  background: rgba(20, 20, 22, 0.45);
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.1), inset 0 -1px 0 rgba(255,255,255,0.02);
}
[data-theme="dark"] .liquid-glass::before {
  background: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.02) 40%, transparent 60%, rgba(255,255,255,0.04) 100%);
}

/* Fallback */
@supports not (backdrop-filter: blur(1px)) {
  .liquid-glass { background: rgba(245,245,247,0.92); }
  [data-theme="dark"] .liquid-glass { background: rgba(30,30,32,0.92); }
}

/* Navbar glass */
.liquid-glass.navbar {
  border-radius: 0 0 var(--glass-radius) var(--glass-radius);
  border-top: none;
}

/* Auth card */
.liquid-glass.auth-card {
  border-radius: 28px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Low-end devices */
@media (max-width: 480px) {
  .bg-orb { animation: none; opacity: 0.3; }
  .liquid-glass { backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
}

/* ─── Dynamic Text Colors (opposite to glass background) ─── */
:root {
  --glass-text-primary: #1d1d1f;
  --glass-text-secondary: rgba(0,0,0,0.6);
  --glass-text-accent: #7c3aed;
  --glass-text-link: rgba(124,58,237,0.8);
  --glass-text-link-hover: #7c3aed;
  --glass-text-error: #dc2626;
  --glass-input-bg: rgba(0,0,0,0.04);
  --glass-input-border: rgba(0,0,0,0.1);
  --glass-input-focus: rgba(124,58,237,0.3);
  --glass-item-hover: rgba(0,0,0,0.04);
  --glass-item-border: rgba(0,0,0,0.06);
  --glass-meta-bg: rgba(0,0,0,0.06);
}

[data-theme="dark"] {
  --glass-text-primary: #f5f5f7;
  --glass-text-secondary: rgba(255,255,255,0.65);
  --glass-text-accent: #a78bfa;
  --glass-text-link: rgba(167,139,250,0.8);
  --glass-text-link-hover: #a78bfa;
  --glass-text-error: #f87171;
  --glass-input-bg: rgba(255,255,255,0.06);
  --glass-input-border: rgba(255,255,255,0.1);
  --glass-input-focus: rgba(167,139,250,0.3);
  --glass-item-hover: rgba(255,255,255,0.06);
  --glass-item-border: rgba(255,255,255,0.06);
  --glass-meta-bg: rgba(255,255,255,0.04);
}

[data-theme] .liquid-glass .file-name,
[data-theme] .liquid-glass .modal-header h3,
[data-theme] .liquid-glass .brand,
[data-theme] .liquid-glass .section-title,
[data-theme] .liquid-glass h2,
[data-theme] .liquid-glass h3,
[data-theme] .liquid-glass .settings-section h3,
[data-theme] .liquid-glass .preview-body,
[data-theme] .liquid-glass .file-info-type,
[data-theme] .liquid-glass .empty-title,
[data-theme] .liquid-glass .delete-filename,
[data-theme] .liquid-glass .file-info-preview,
[data-theme] .liquid-glass .share-file-label,
[data-theme] .liquid-glass .nav-brand,
[data-theme] .liquid-glass .nav-link { color: var(--glass-text-primary); }

[data-theme] .liquid-glass .file-size,
[data-theme] .liquid-glass .file-meta,
[data-theme] .liquid-glass .share-meta,
[data-theme] .liquid-glass .file-info-hint,
[data-theme] .liquid-glass .subtitle,
[data-theme] .liquid-glass .file-info-ext,
[data-theme] .liquid-glass .breadcrumb,
[data-theme] .liquid-glass .form-group label,
[data-theme] .liquid-glass .file-info-preview .file-info-hint,
[data-theme] .liquid-glass .share-name,
[data-theme] .liquid-glass .nav-user,
[data-theme] .liquid-glass .preview-code { color: var(--glass-text-secondary); }

[data-theme] .liquid-glass .file-action,
[data-theme] .liquid-glass .crumb { color: var(--glass-text-link); }
[data-theme] .liquid-glass .file-action:hover { color: var(--glass-text-link-hover); }
[data-theme] .liquid-glass .crumb:hover { color: var(--glass-text-link-hover); }

[data-theme] .liquid-glass .empty-desc { color: var(--glass-text-secondary); }
[data-theme] .liquid-glass .error { color: var(--glass-text-error); }

/* File items in glass list */
[data-theme] .liquid-glass .file-item {
  border-bottom: 1px solid var(--glass-item-border);
}
[data-theme] .liquid-glass .file-item:hover {
  background: var(--glass-item-hover);
}

/* Input groups in glass */
[data-theme] .liquid-glass input,
[data-theme] .liquid-glass .form-group input,
[data-theme] .liquid-glass .add-user-form input {
  border-color: var(--glass-input-border);
  color: var(--glass-text-primary);
  background: var(--glass-input-bg);
}
[data-theme] .liquid-glass input:focus {
  border-color: var(--glass-text-accent);
  box-shadow: 0 0 0 3px var(--glass-input-focus);
}

/* Modal actions background */
[data-theme] .liquid-glass .modal-actions {
  background: var(--glass-meta-bg);
}

/* Share item glass */
[data-theme] .liquid-glass.share-item {
  padding: 14px 18px;
}


/* ─── Auth Card Beautiful Styling (always dark) ─── */
[data-theme] .auth-container {
  background: linear-gradient(135deg, #1a1040 0%, #0d1230 40%, #1a0a2e 70%, #0b0b12 100%);
}
[data-theme] .auth-card.liquid-glass {
  border-radius: 28px;
  padding: 48px 40px;
  max-width: 420px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow:
    0 20px 60px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.15),
    inset 0 -1px 0 rgba(255,255,255,0.05);
}
[data-theme] .auth-card.liquid-glass .brand {
  font-size: 28px;
  background: linear-gradient(135deg, #a78bfa, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
[data-theme] .auth-card.liquid-glass .subtitle {
  color: rgba(255,255,255,0.5);
}
[data-theme] .auth-card.liquid-glass .auth-logo {
  width: 72px; height: 72px;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  font-size: 36px;
  box-shadow: 0 8px 32px rgba(124,58,237,0.3);
  animation: authLogoFloat 3s ease-in-out infinite;
}
@keyframes authLogoFloat {
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-6px)}
}
[data-theme] .auth-card.liquid-glass input {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  color: #fff;
  padding: 14px 14px 14px 44px;
  border-radius: 14px;
}
[data-theme] .auth-card.liquid-glass input::placeholder {
  color: rgba(255,255,255,0.3);
}
[data-theme] .auth-card.liquid-glass input:focus {
  border-color: rgba(167,139,250,0.5);
  box-shadow: 0 0 0 3px rgba(167,139,250,0.15);
  background: rgba(255,255,255,0.08);
}
[data-theme] .auth-card.liquid-glass .btn-primary {
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  border: none;
  border-radius: 14px;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(124,58,237,0.3);
  color: #fff;
  width: 100%;
}
[data-theme] .auth-card.liquid-glass .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124,58,237,0.4);
}
[data-theme] .auth-card.liquid-glass .auth-toggle a {
  color: rgba(167,139,250,0.7);
}
[data-theme] .auth-card.liquid-glass .auth-toggle a:hover {
  color: rgba(167,139,250,1);
}
[data-theme] .auth-card.liquid-glass .error {
  color: #f87171;
}

/* ─── Share page text always white ─── */
[data-theme] .liquid-glass.share-item .share-name,
[data-theme] .liquid-glass.share-item .share-meta { color: #ffffff; }

/* ─── Share modal always dark for white text readability ─── */
[data-theme] .modal-content.liquid-glass {
  background: rgba(20,20,22,0.45);
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.1);
}
[data-theme] .modal-content.liquid-glass .modal-header h3 { color: #ffffff; }
[data-theme] .modal-content.liquid-glass .share-file-label { color: rgba(255,255,255,0.7); }
[data-theme] .modal-content.liquid-glass label { color: rgba(255,255,255,0.7); }
[data-theme] .modal-content.liquid-glass input {
  color: #ffffff;
  border-color: rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.06);
}
[data-theme] .modal-content.liquid-glass input:focus {
  border-color: rgba(167,139,250,0.5);
  box-shadow: 0 0 0 3px rgba(167,139,250,0.15);
}
[data-theme] .modal-content.liquid-glass .modal-actions {
  background: rgba(0,0,0,0.15);
}