/* CSS Variables for Theming */
:root {
    --bg-primary: #1e1e2e;
    --bg-secondary: #181825;
    --bg-tertiary: #11111b;
    --text-primary: #cdd6f4;
    --text-secondary: #a6adc8;
    --text-muted: #6c7086;
    --accent-primary: #89b4fa;
    --accent-secondary: #74c7ec;
    --accent-success: #a6e3a1;
    --accent-warning: #f9e2af;
    --accent-error: #f38ba8;
    --border-color: #313244;
    --panel-bg: #1e1e2e;
    --header-bg: #181825;
    --btn-bg: #313244;
    --btn-hover: #45475a;
    --scrollbar-thumb: #45475a;
    --scrollbar-track: #181825;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --bg-primary: #eff1f5;
    --bg-secondary: #e6e9ef;
    --bg-tertiary: #dce0e8;
    --text-primary: #4c4f69;
    --text-secondary: #5c5f77;
    --text-muted: #8c8fa1;
    --accent-primary: #1e66f5;
    --accent-secondary: #209fb5;
    --accent-success: #40a02b;
    --accent-warning: #df8e1d;
    --accent-error: #d20f39;
    --border-color: #ccd0da;
    --panel-bg: #eff1f5;
    --header-bg: #e6e9ef;
    --btn-bg: #ccd0da;
    --btn-hover: #bcc0cc;
    --scrollbar-thumb: #9ca0b0;
    --scrollbar-track: #e6e9ef;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

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

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

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

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

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

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

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-tertiary);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(137, 180, 250, 0.4);
}

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

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

.btn-icon-only {
    padding: 8px;
    background: var(--btn-bg);
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-icon-only:hover {
    background: var(--btn-hover);
}

.btn-small {
    padding: 4px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-icon {
    font-size: 0.875rem;
}

/* Examples Dropdown */
.examples-dropdown {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--btn-bg);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

.examples-dropdown:hover {
    border-color: var(--accent-primary);
}

.examples-dropdown option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Download Dropdown */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 180px;
    box-shadow: var(--shadow);
    z-index: 100;
    margin-top: 4px;
    overflow: hidden;
}

.dropdown-content.show {
    display: block;
}

.dropdown-content button {
    display: block;
    width: 100%;
    padding: 10px 16px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-align: left;
    cursor: pointer;
    transition: background 0.2s ease;
}

.dropdown-content button:hover {
    background: var(--btn-hover);
}

.dropdown-content button:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Panels */
.panel {
    display: flex;
    flex-direction: column;
    background: var(--panel-bg);
    overflow: hidden;
}

.editor-panel {
    flex: 1;
    min-width: 300px;
    border-right: 1px solid var(--border-color);
}

.output-panel {
    flex: 1;
    min-width: 300px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

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

/* Editor Container */
#editor-container {
    flex: 1;
    overflow: hidden;
}

/* Resizer */
.resizer {
    width: 6px;
    background: var(--border-color);
    cursor: col-resize;
    transition: background 0.2s ease;
    flex-shrink: 0;
}

.resizer:hover,
.resizer.active {
    background: var(--accent-primary);
}

/* Tabs */
.panel-tabs {
    display: flex;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 8px;
}

.tab {
    padding: 10px 16px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

/* Tab Content */
.tab-content {
    display: none;
    flex: 1;
    overflow: auto;
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

/* Plot Container */
#plot-container {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow: auto;
}

#plot-container .plot-wrapper {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 16px;
    box-shadow: var(--shadow);
}

#plot-container .js-plotly-plot {
    width: 100% !important;
}

/* Console Output */
#console-output {
    flex: 1;
    padding: 16px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    overflow: auto;
    background: var(--bg-tertiary);
}

.console-line {
    padding: 4px 0;
    border-bottom: 1px solid var(--border-color);
    white-space: pre-wrap;
    word-break: break-all;
}

.console-line:last-child {
    border-bottom: none;
}

.console-log {
    color: var(--text-primary);
}

.console-info {
    color: var(--accent-secondary);
}

.console-warn {
    color: var(--accent-warning);
}

.console-error {
    color: var(--accent-error);
}

.console-success {
    color: var(--accent-success);
}

.console-timestamp {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-right: 8px;
}

/* Documentation */
#docs-content {
    flex: 1;
    padding: 24px;
    overflow: auto;
    max-width: 800px;
}

#docs-content h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--accent-primary);
}

#docs-content h3 {
    font-size: 1.1rem;
    margin: 24px 0 12px;
    color: var(--text-primary);
}

#docs-content p {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

#docs-content code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85em;
    color: var(--accent-secondary);
}

#docs-content pre {
    background: var(--bg-tertiary);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 12px 0;
}

#docs-content pre code {
    background: transparent;
    padding: 0;
}

#docs-content ul, #docs-content ol {
    margin: 12px 0;
    padding-left: 24px;
}

#docs-content li {
    margin: 8px 0;
    color: var(--text-secondary);
}

#docs-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

#docs-content th, #docs-content td {
    padding: 10px 12px;
    text-align: left;
    border: 1px solid var(--border-color);
}

#docs-content th {
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
}

#docs-content td {
    color: var(--text-secondary);
}

/* Status Bar */
.status-bar {
    display: flex;
    justify-content: space-between;
    padding: 6px 16px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.status-links {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.status-links a:hover {
    color: var(--accent-primary);
}

.status-links .separator {
    color: var(--border-color);
}

#execution-time {
    color: var(--accent-success);
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--bg-tertiary);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 60px;
    right: 20px;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-color: var(--accent-success);
}

.toast.error {
    border-color: var(--accent-error);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .editor-panel {
        min-height: 300px;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .resizer {
        width: 100%;
        height: 6px;
        cursor: row-resize;
    }
    
    .header {
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .header-actions {
        flex-wrap: wrap;
    }
}

/* Plot Theming */
.js-plotly-plot .plotly .modebar {
    background: var(--bg-secondary) !important;
}

.js-plotly-plot .plotly .modebar-btn {
    color: var(--text-secondary) !important;
}

.js-plotly-plot .plotly .modebar-btn:hover {
    color: var(--accent-primary) !important;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1rem;
    margin-bottom: 8px;
}

.empty-state-hint {
    font-size: 0.875rem;
    opacity: 0.7;
}