:root {
    --bg-primary: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-elevated: #334155;
    --bg-surface-hover: #475569;
    --border-color: #334155;
    --border-subtle: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: rgba(59, 130, 246, 0.15);
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --danger-light: rgba(239, 68, 68, 0.15);
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.15);
    --warning: #f59e0b;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--primary-hover);
}

/* Header & Navbar */
.navbar {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0.85rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 40;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand-icon {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    display: inline-block;
    vertical-align: middle;
}

.nav-brand span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background-color: var(--bg-surface-elevated);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Container */
.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    flex: 1;
}

/* Cards */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Auth Card */
.auth-wrapper {
    min-height: calc(100vh - 150px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}

.auth-brand-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.auth-brand-logo {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: 2rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.925rem;
    font-family: inherit;
    transition: border-color 0.15s ease;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.form-row-error {
    color: var(--danger);
    font-size: 0.8rem;
    margin-top: 0.35rem;
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    font-family: inherit;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: #ffffff;
}

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

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

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

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

.btn-danger-outline {
    background-color: transparent;
    color: var(--danger);
    border-color: var(--danger);
}

.btn-danger-outline:hover {
    background-color: var(--danger-light);
}

.btn-sm {
    padding: 0.35rem 0.7rem;
    font-size: 0.8rem;
}

.btn-block {
    width: 100%;
}

/* Alerts */
.alert {
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.alert-success {
    background-color: var(--success-light);
    border: 1px solid var(--success);
    color: #34d399;
}

.alert-danger {
    background-color: var(--danger-light);
    border: 1px solid var(--danger);
    color: #f87171;
}

/* Breadcrumbs */
.breadcrumb-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-item a {
    color: var(--text-secondary);
}

.breadcrumb-item a:hover {
    color: var(--primary);
}

.breadcrumb-item.active {
    color: var(--text-primary);
    font-weight: 600;
}

.breadcrumb-sep {
    color: var(--text-muted);
}

/* Explorer Layout & Actions */
.explorer-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Grid & Tables */
.folders-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.folder-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.15s ease;
}

.folder-card:hover {
    border-color: var(--primary);
    background-color: var(--bg-surface-elevated);
}

.folder-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    overflow: hidden;
}

.folder-icon {
    font-size: 1.5rem;
}

.folder-name {
    color: var(--text-primary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table th,
.table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--bg-surface-elevated);
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.table tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

.table-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* API Token Box */
.token-box {
    background-color: var(--bg-primary);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.token-code {
    display: block;
    background-color: #0b1120;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.95rem;
    color: #38bdf8;
    margin: 0.5rem 0;
    word-break: break-all;
    user-select: all;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

/* Dropzone Styles */
.dropzone-card {
    display: flex;
    flex-direction: column;
}

.dropzone-container {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.75rem 1.25rem;
    text-align: center;
    background-color: rgba(15, 23, 42, 0.4);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    user-select: none;
}

.dropzone-container:hover {
    border-color: var(--primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.dropzone-container.dropzone-dragover {
    border-color: var(--primary);
    background-color: rgba(59, 130, 246, 0.12);
    transform: scale(1.01);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.25);
}

.dropzone-container.dropzone-uploading {
    pointer-events: none;
    border-color: var(--primary);
    background-color: rgba(59, 130, 246, 0.08);
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.dropzone-icon {
    font-size: 2.25rem;
    line-height: 1;
    margin-bottom: 0.25rem;
    transition: transform 0.2s ease;
}

.dropzone-container:hover .dropzone-icon,
.dropzone-container.dropzone-dragover .dropzone-icon {
    transform: translateY(-3px) scale(1.08);
}

.dropzone-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.dropzone-title span {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.dropzone-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.dropzone-uploading-state {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
}

.dropzone-container.dropzone-uploading .dropzone-content {
    display: none;
}

.dropzone-container.dropzone-uploading .dropzone-uploading-state {
    display: flex;
}

.dropzone-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: dropzone-spin 0.8s linear infinite;
}

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

.dropzone-file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.825rem;
}