:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-editor: #0d1117;
    --bg-panel: #161b22;
    --bg-input: #0d1117;
    --border-color: #30363d;
    --border-light: #484f58;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-blue: #58a6ff;
    --accent-cyan: #39c5cf;
    --accent-green: #3fb950;
    --accent-red: #f85149;
    --accent-yellow: #d29922;
    --accent-purple: #a371f7;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 150ms ease;
    --toolbar-height: 56px;
    --nav-height: 60px;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #ffffff;
    --bg-editor: #ffffff;
    --bg-panel: #f6f8fa;
    --bg-input: #ffffff;
    --border-color: #d0d7de;
    --border-light: #d8dee4;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --text-muted: #6e7781;
    --accent-blue: #0969da;
    --accent-cyan: #0598bc;
    --accent-green: #2da44e;
    --accent-red: #cf222e;
    --accent-yellow: #9a6700;
    --accent-purple: #8250df;
}

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

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

.compiler-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navigation */
.compiler-nav {
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-brand span {
    color: var(--accent-blue);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 24px;
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
}

.language-selector select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: inherit;
    cursor: pointer;
    min-width: 180px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.language-selector select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

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

.btn-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

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

.btn-icon:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.3);
}

/* Main Layout */
.compiler-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Toolbar */
.editor-toolbar {
    height: var(--toolbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: 16px;
    flex-wrap: wrap;
}

.toolbar-left,
.toolbar-center,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toolbar-center {
    flex: 1;
    justify-content: center;
}

.execution-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    font-weight: 500;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition);
}

.status-indicator.running {
    background: var(--accent-blue);
    animation: pulse 1s infinite;
}

.status-indicator.success {
    background: var(--accent-green);
}

.status-indicator.error {
    background: var(--accent-red);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: #3b8fd9;
    border-color: #3b8fd9;
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-primary);
    border-color: var(--border-light);
}

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

.btn-danger:hover:not(:disabled) {
    background: #d13c35;
    border-color: #d13c35;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.btn-run {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.btn-run:hover:not(:disabled) {
    background: #2ea043;
    border-color: #2ea043;
}

/* Compiler Layout */
.compiler-layout {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

.editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-editor);
    border-right: 1px solid var(--border-color);
    min-width: 0;
    transition: width var(--transition);
}

.io-panel {
    width: 380px;
    display: flex;
    flex-direction: column;
    background: var(--bg-panel);
    border-left: 1px solid var(--border-color);
    min-width: 300px;
    max-width: 500px;
    transition: width var(--transition);
}

.io-panel.collapsed {
    width: 0;
    min-width: 0;
    border-left: none;
}

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

.panel-header h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.panel-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-controls select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    color: var(--text-primary);
    font-size: 0.75rem;
    font-family: inherit;
    cursor: pointer;
}

.editor-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

#monaco-editor {
    width: 100%;
    height: 100%;
}

.editor-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 6px 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

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

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-blue);
    transform: scaleX(0);
    transition: transform var(--transition);
}

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

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-btn:hover:not(.active) {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.tab-panels {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.tab-panel {
    display: none;
    flex-direction: column;
    height: 100%;
}

.tab-panel.active {
    display: flex;
}

.input-header,
.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

#input-console {
    flex: 1;
    width: 100%;
    background: var(--bg-input);
    border: none;
    outline: none;
    resize: none;
    padding: 16px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
}

#input-console::placeholder {
    color: var(--text-muted);
}

.output-container {
    flex: 1;
    overflow: auto;
    position: relative;
}

.output-console {
    margin: 0;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-primary);
    min-height: 100%;
}

.output-console .output-line {
    display: block;
}

.output-console .stdout { color: var(--text-primary); }
.output-console .stderr { color: var(--accent-red); }
.output-console .compilation-error { color: var(--accent-red); }
.output-console .runtime-error { color: var(--accent-red); }
.output-console .warning { color: var(--accent-yellow); }
.output-console .success { color: var(--accent-green); }
.output-console .info { color: var(--accent-cyan); }
.output-console .execution-time { color: var(--text-muted); font-size: 0.8rem; }
.output-console .memory-used { color: var(--text-muted); font-size: 0.8rem; }
.output-console .exit-code { color: var(--text-muted); font-size: 0.8rem; }

.output-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Interactive Input Section inside Output Tab */
.interactive-input-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.interactive-input-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
    font-weight: 600;
}

.stdin-title {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--accent-cyan);
}

.input-quick-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-quick-run {
    background: var(--accent-green);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: background var(--transition);
}

.btn-quick-run:hover {
    background: #2ea043;
}

.btn-icon-sm {
    width: 24px;
    height: 24px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.7rem;
}

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

.interactive-input-body {
    padding: 8px 14px;
}

#output-stdin-input {
    width: 100%;
    height: 70px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
}

#output-stdin-input:focus {
    border-color: var(--accent-blue);
}

/* Execution Details */
.execution-details {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 12px 16px;
    z-index: 10;
    animation: slideUp 200ms ease;
}

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

.details-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.detail-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
}

.detail-value.success { color: var(--accent-green); }
.detail-value.error { color: var(--accent-red); }
.detail-value.warning { color: var(--accent-yellow); }

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 200ms ease;
}

.modal-overlay.active + .modal,
.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    max-height: 60vh;
}

.share-url-container {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.share-url-container input {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
}

.share-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.share-options label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    cursor: pointer;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.85rem;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.history-item:hover {
    border-color: var(--border-light);
    background: var(--bg-panel);
}

.history-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}

.history-item-name {
    font-weight: 500;
    font-size: 0.85rem;
}

.history-item-time {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.history-item-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    .compiler-layout {
        flex-direction: column;
    }

    .editor-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        min-height: 400px;
    }

    .io-panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
        min-height: 300px;
        max-height: 400px;
    }

    .toolbar-left,
    .toolbar-center,
    .toolbar-right {
        flex-wrap: wrap;
    }

    .editor-toolbar {
        height: auto;
        padding: 12px 16px;
        gap: 12px;
    }
}

@media (max-width: 640px) {
    .compiler-nav {
        padding: 0 12px;
    }

    .nav-brand span {
        display: none;
    }

    .nav-center {
        gap: 12px;
    }

    .language-selector select {
        min-width: 140px;
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .btn span {
        display: none;
    }

    .btn {
        padding: 8px;
    }

    .panel-header h3 span {
        display: none;
    }

    .details-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Monaco Editor Customization */
.monaco-editor {
    background: var(--bg-editor) !important;
}

.monaco-editor .margin {
    background: var(--bg-editor) !important;
}

.monaco-editor .lines-content {
    font-family: 'JetBrains Mono', monospace !important;
}

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

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

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

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

/* Selection */
::selection {
    background: rgba(88, 166, 255, 0.3);
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

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

.fade-in {
    animation: fadeIn 200ms ease;
}

/* Loading State */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(13, 17, 23, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 50;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Tooltip */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 100;
    margin-bottom: 6px;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #fff;
        --border-light: #fff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}