/* Design Tokens */
:root {
    /* Colors */
    --background: #FFFFFF;
    --background-secondary: #F8F9FA;
    --background-tertiary: #F1F3F5;
    --surface: #FFFFFF;

    --text-primary: #1A1A1A;
    --text-secondary: #6B6B6B;
    --text-tertiary: #9B9B9B;
    --text-disabled: #C4C4C4;

    --border-light: #E5E5E5;
    --border-medium: #D4D4D4;
    --border-strong: #A3A3A3;

    --accent-primary: #0066FF;
    --accent-primary-hover: #0052CC;
    --accent-success: #00875A;
    --accent-warning: #FF991F;
    --accent-danger: #E34850;

    /* Spacing (8px grid) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* Shadows (Elevation System) */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.06), 0 4px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.08), 0 8px 16px rgba(0, 0, 0, 0.08);
    --shadow-focus: 0 0 0 3px rgba(0, 102, 255, 0.15);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-12) var(--space-8);
    background-color: var(--background);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 0;
    color: var(--text-primary);
}

h3 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    margin: 0 0 var(--space-4);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--space-12);
}

/* Main Layout */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-5);
}

@media (max-width: 768px) {
    body {
        padding: var(--space-6) var(--space-4);
    }

    h1 {
        font-size: 28px;
    }

    .main-content {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

.left-panel, .right-panel {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* Control Panels */
.left-controls, .right-controls {
    background: var(--background-secondary);
    padding: var(--space-5) var(--space-6);
    border-radius: 12px;
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.control-group label {
    font-weight: 500;
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
    text-transform: uppercase;
}

/* Form Controls */
.control-group input,
.control-group select,
input[type="number"],
select {
    background: var(--surface);
    border: 1.5px solid var(--border-light);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.control-group input:hover,
.control-group select:hover,
input[type="number"]:hover,
select:hover {
    border-color: var(--border-medium);
}

.control-group input:focus,
.control-group select:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-focus);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary {
    background: var(--accent-primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1.5px solid var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--accent-success);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #006644;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-warning {
    background: var(--accent-warning);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: #E68A00;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
    background: #C73846;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.buttons {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Stats/Badges */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
}

@media (max-width: 768px) {
    .stats {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }
}

.stat {
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.stat-label {
    font-weight: 500;
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.stat-value {
    font-weight: 600;
    font-size: 20px;
    color: var(--text-primary);
}

.stat-value.status-stopped {
    color: var(--accent-danger);
}

/* Panel Titles */
.panel-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    border: none;
    background: none;
}

/* Content Sections */
.source-code, .renderer-container {
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#monacoEditor, #monacoRendererEditor {
    flex: 1;
    min-height: 500px;
    border: none;
}

#codeRenderer {
    flex: 1;
    min-height: 500px;
}

/* Progress Bar */
.progress {
    background-color: var(--background-tertiary);
    height: 6px;
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--accent-primary), #4D94FF);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

/* Structured Renderer Container */
#codeRenderer {
    font-family: Menlo, Monaco, "Consolas", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace;
    font-size: 13px;
    line-height: 1.5;
    white-space: pre;
    padding: 0;
    overflow: auto;
    display: flex;
}

/* Line Numbers */
.line-numbers {
    border-right: 1px solid var(--border-light);
    padding: 0 10px;
    text-align: center;
    color: #237893;
    user-select: none;
    min-width: 40px;
    flex-shrink: 0;
}

/* Code Content */
.code-content {
    padding: 0 20px 20px 8px;
    flex: 1;
}

/* Syntax Highlighting (Monaco VS Code Light Theme) */
.java-keyword {
    color: #0000FF;
}

.java-identifier {
    color: #001080;
}

.java-operator {
    color: #000000;
}

.java-punctuation {
    color: #000000;
}

.java-literal {
    color: #098658;
}

.java-comment {
    color: #008000;
    font-style: italic;
}

/* Token Animation */
.java-token {
    opacity: 1;
    transition: opacity 0.1s ease-in;
}

.java-token.revealing {
    opacity: 0;
    animation: fadeIn 0.2s ease-in forwards;
}

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