:root {
    --bg-main: #0D1117;
    --bg-surface: #161B22;
    --bg-elevated: #21262D;

    --primary: #58A6FF;
    --primary-hover: #3182CE;

    --accent: #238636;
    --accent-hover: #2EA043;

    --text-primary: #C9D1D9;
    --text-secondary: #8B949E;
    --text-muted: #484F58;

    --border: #30363D;

    --error: #F85149;
    --warning: #D29922;
    --primitive: #A5D6FF;
    --referential: #D2A8FF;

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Utilities */
.text-muted {
    color: var(--text-secondary);
}

.mt-4 {
    margin-top: 1rem;
}

.spacer {
    flex: 1;
}

/* Layout */
.app-layout {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.brand {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

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

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
}

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

.sidebar-section {
    padding: 20px 0;
    overflow-y: auto;
}

.section-title {
    padding: 0 24px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
}

.nav-item {
    padding: 10px 24px;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: background 0.1s;
}

.nav-item:hover {
    background-color: var(--bg-elevated);
}

.nav-item.active {
    background-color: var(--bg-elevated);
    border-left-color: var(--primary);
    font-weight: 500;
}

.sidebar-help {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.help-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.dot.primitive {
    background-color: var(--primitive);
}

.dot.referential {
    background-color: var(--referential);
}

.dot.warning {
    background-color: var(--error);
}

/* Main Workspace */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.header {
    padding: 20px 32px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    background-color: var(--bg-main);
    z-index: 10;
}

.header h2 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    font-family: inherit;
    transition: all 0.2s;
}

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

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

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

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

.split-view {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px 32px;
    overflow-y: auto;
}

.code-panel {
    border-right: 1px solid var(--border);
    max-width: 50%;
}

.panel-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-weight: 600;
}

/* Code Viewer */
.code-container {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
    color: #e6edf3;
}

.code-container pre {
    margin: 0;
}

/* Syntax Highlighting Mock */
.keyword {
    color: #ff7b72;
}

.function {
    color: #d2a8ff;
}

.string {
    color: #a5d6ff;
}

.comment {
    color: #8b949e;
}

.punctuation {
    color: #c9d1d9;
}

.hook {
    color: #79c0ff;
}

/* Controls */
.controls-container {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Evaluation Container */
.eval-container {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
}

.eval-container h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.dep-array {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.dep-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    background: var(--bg-elevated);
    border-radius: 6px;
    border-left: 4px solid transparent;
}

.dep-item.same {
    border-left-color: var(--accent);
}

.dep-item.changed {
    border-left-color: var(--warning);
}

.dep-item.recreated {
    border-left-color: var(--error);
    animation: flash 1s ease;
}

@keyframes flash {
    0% {
        background-color: rgba(248, 81, 73, 0.2);
    }

    100% {
        background-color: var(--bg-elevated);
    }
}

.dep-name {
    font-weight: bold;
    width: 120px;
}

.dep-val {
    color: var(--text-secondary);
    flex: 1;
}

.dep-status {
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 4px;
}

.status-changed {
    background: rgba(210, 153, 34, 0.2);
    color: var(--warning);
}

.status-same {
    background: rgba(35, 134, 54, 0.2);
    color: var(--accent);
}

.status-recreated {
    background: rgba(248, 81, 73, 0.2);
    color: var(--error);
}

/* Timeline */
.timeline-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.timeline-container h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 16px;
    width: 2px;
    background: var(--border);
    z-index: 1;
}

.tl-event {
    position: relative;
    padding-left: 40px;
    z-index: 2;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(10px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.tl-dot {
    position: absolute;
    left: 11px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-surface);
    border: 2px solid var(--text-secondary);
}

.tl-event.render .tl-dot {
    border-color: var(--primary);
}

.tl-event.effect .tl-dot {
    border-color: var(--accent);
}

.tl-event.cleanup .tl-dot {
    border-color: var(--warning);
}

.tl-event.dom .tl-dot {
    border-color: var(--referential);
}

.tl-content {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
}

.tl-title {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.tl-event.render .tl-title {
    color: var(--primary);
}

.tl-event.effect .tl-title {
    color: var(--accent);
}

.tl-event.cleanup .tl-title {
    color: var(--warning);
}

.tl-event.dom .tl-title {
    color: var(--referential);
}

.tl-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* Lint Warning Modal/Toast */
.lint-warning {
    position: absolute;
    bottom: 24px;
    right: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--error);
    border-left: 4px solid var(--error);
    padding: 16px 20px;
    border-radius: 8px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    transform: translateY(150%);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 100;
}

.lint-warning.show {
    transform: translateY(0);
}

.lint-warning svg {
    color: var(--error);
    flex-shrink: 0;
}

.lint-warning span {
    font-size: 0.85rem;
    line-height: 1.4;
}