/* style.css - Premium Space Dark Design System */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Color Palette */
    --bg-main: #0d0f12;
    --bg-panel: #151921;
    --bg-card: #1c212c;
    --bg-input: #1a1e27;
    
    --border-light: rgba(255, 255, 255, 0.05);
    --border-medium: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.15);
    --border-accent: rgba(59, 130, 246, 0.3);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --text-dim: #4b5563;
    
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
    --accent-emerald: #10b981;
    --accent-rose: #f43f5e;
    --accent-amber: #f59e0b;

    /* Transitions */
    --transition-fast: all 0.15s ease;
    --transition-normal: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Fonts */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Fira Code', 'JetBrains Mono', monospace;
}

/* Light Theme Variables Overrides */
body.light-theme {
    --bg-main: #f3f4f6;
    --bg-panel: #ffffff;
    --bg-card: #f9fafb;
    --bg-input: #f3f4f6;
    
    --border-light: rgba(0, 0, 0, 0.04);
    --border-medium: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.15);
    --border-accent: rgba(59, 130, 246, 0.2);
    
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --text-dim: #9ca3af;
}

/* Theme Toggle Button Style */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-strong);
    color: var(--text-secondary);
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.theme-toggle-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

body.light-theme .theme-toggle-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}


/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

input, select, textarea, button {
    font-family: inherit;
    color: inherit;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Utility Classes */
.flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.flex-1 { flex: 1; }
.hidden { display: none !important; }

/* Login Page Container */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.08), transparent 45%),
                radial-gradient(circle at bottom left, rgba(139, 92, 246, 0.08), transparent 45%),
                var(--bg-main);
}

.login-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-medium);
    border-radius: 16px;
    padding: 2.5rem;
    width: 100%;
    max-width: 460px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(12px);
    transition: var(--transition-normal);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-title {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 1rem;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-blue);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    gap: 0.5rem;
    width: 100%;
}

.btn:hover {
    background-color: #2563eb;
    transform: translateY(-1px);
}

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

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

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.error-banner {
    background-color: rgba(244, 63, 94, 0.1);
    border: 1px solid rgba(244, 63, 94, 0.2);
    color: var(--accent-rose);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    display: none;
}

/* Dashboard Layout */
.app-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Styling */
.sidebar {
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-medium);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-light);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 40%, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.db-selector-container {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
}

.select-dropdown {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: var(--transition-fast);
}

.select-dropdown:focus {
    border-color: var(--accent-blue);
}

.table-list-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1.5rem;
}

.search-input {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    outline: none;
}

.search-input:focus {
    border-color: var(--accent-blue);
}

.list-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.table-list {
    list-style: none;
}

.table-item {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.table-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.table-item.active {
    background-color: rgba(59, 130, 246, 0.08);
    color: var(--accent-blue);
    font-weight: 500;
    border-left: 2px solid var(--accent-blue);
    border-radius: 0 6px 6px 0;
    padding-left: calc(0.75rem - 2px);
}

.table-item-icon {
    margin-right: 0.5rem;
    font-size: 1.1rem;
    opacity: 0.7;
}

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

.main-header {
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-medium);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.breadcrumbs {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.breadcrumb-sep {
    margin: 0 0.5rem;
    color: var(--text-muted);
}

.current-path {
    color: var(--text-primary);
    font-weight: 600;
}

.server-badge {
    background-color: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    color: var(--accent-cyan);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.logout-link {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.logout-link:hover {
    color: var(--accent-rose);
}

/* Tabs Navigation */
.tabs-nav {
    background-color: var(--bg-panel);
    display: flex;
    padding: 0 2rem;
    border-bottom: 1px solid var(--border-light);
}

.tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

/* Tab Panel Content */
.tab-content-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.tab-pane {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 2rem;
}

/* Data Pane Styles */
.data-toolbar {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pg-btn {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-medium);
    color: var(--text-primary);
    border-radius: 6px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.pg-btn:hover:not(:disabled) {
    background-color: var(--bg-card);
    border-color: var(--border-strong);
}

.pg-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.pg-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0 0.5rem;
}

.table-wrapper {
    flex: 1;
    overflow: auto;
    border: 1px solid var(--border-medium);
    border-radius: 10px;
    background-color: var(--bg-panel);
}

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

.data-table th {
    background-color: var(--bg-card);
    position: sticky;
    top: 0;
    padding: 0.75rem 1rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-medium);
    z-index: 10;
    cursor: pointer;
    user-select: none;
}

.data-table th:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.data-table th .sort-icon {
    font-size: 0.75rem;
    margin-left: 0.25rem;
    opacity: 0.5;
}

.data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
    white-space: nowrap;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

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

.null-value {
    color: var(--text-dim);
    font-style: italic;
}

/* SQL Query Pane */
.sql-workspace {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: 100%;
}

.editor-container {
    position: relative;
    border: 1px solid var(--border-medium);
    border-radius: 10px;
    background-color: var(--bg-panel);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.editor-toolbar {
    background-color: var(--bg-card);
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-medium);
    display: flex;
    gap: 0.5rem;
}

.editor-tag {
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    color: var(--accent-cyan);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    font-family: var(--font-mono);
    transition: var(--transition-fast);
}

.editor-tag:hover {
    border-color: var(--accent-cyan);
    background-color: rgba(6, 182, 212, 0.05);
}

.sql-textarea {
    width: 100%;
    height: 160px;
    background-color: transparent;
    border: none;
    resize: vertical;
    padding: 1rem;
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    line-height: 1.5;
}

.sql-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 0.5rem;
}

.query-results-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-medium);
    border-radius: 10px;
    background-color: var(--bg-panel);
}

.section-header {
    background-color: var(--bg-card);
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border-medium);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.query-output {
    flex: 1;
    overflow: auto;
    padding: 1rem;
}

.query-alert {
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.query-alert.success {
    background-color: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--accent-emerald);
}

.query-alert.danger {
    background-color: rgba(244, 63, 94, 0.08);
    border: 1px solid rgba(244, 63, 94, 0.2);
    color: var(--accent-rose);
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(13, 15, 18, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.05);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* General Placeholder Content */
.placeholder-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        display: none; /* In a production app, we would add a burger menu toggler */
    }
}