/* Playground Common Styles */

/* Page Layout */
.page-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.page-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-4);
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.nav-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.page-content {
    flex: 1;
    padding: var(--space-8) 0;
}

/* Playground Container */
.playground {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    margin: var(--space-8) 0;
}

.playground-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border);
}

.playground-title {
    font-weight: 600;
    color: var(--text-primary);
}

.reset-btn {
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.reset-btn:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.playground-body {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}

@media (min-width: 900px) {
    .playground-body {
        grid-template-columns: 300px 1fr;
    }
}

/* Controls Panel */
.controls-panel {
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--border);
    max-height: 400px;
    overflow-y: auto;
}

@media (min-width: 900px) {
    .controls-panel {
        border-bottom: none;
        border-right: 1px solid var(--border);
        max-height: none;
    }
}

.control-group {
    margin-bottom: var(--space-4);
}

.control-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.control-select,
.control-input {
    width: 100%;
    padding: var(--space-2);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.control-select:focus,
.control-input:focus {
    outline: none;
    border-color: var(--accent);
}

/* Range Slider */
.range-container {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.range-value {
    min-width: 50px;
    text-align: right;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent);
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

/* Preview Area */
.preview-area {
    padding: var(--space-4);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
    background-image: radial-gradient(var(--border) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Code Output */
.code-output {
    background: #0d0d0d;
    padding: var(--space-4);
    border-top: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #d4d4d4;
    overflow-x: auto;
}

.code-output pre {
    margin: 0;
}

/* Section Card */
.section-intro {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}

.section-intro h1 {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-intro p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Key Points */
.key-points {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--space-6);
    margin-top: var(--space-8);
}

.key-points h3 {
    margin-bottom: var(--space-4);
    color: var(--success);
}

.key-points ul {
    list-style: none;
    padding: 0;
}

.key-points li {
    padding: var(--space-2) 0;
    padding-left: var(--space-6);
    position: relative;
    color: var(--text-secondary);
}

.key-points li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* Flex Demo Items */
.flex-demo-container {
    display: flex;
    width: 100%;
    min-height: 250px;
    padding: var(--space-4);
    gap: 16px;
    transition: all 0.3s ease;
}

.flex-demo-item {
    min-width: 60px;
    min-height: 60px;
    background: var(--accent);
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--accent-glow);
    transition: all 0.3s ease;
}

.flex-demo-item:nth-child(2) {
    background: var(--success);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.flex-demo-item:nth-child(3) {
    background: #a855f7;
    box-shadow: 0 4px 12px rgba(168, 85, 247, 0.3);
}

.flex-demo-item:nth-child(4) {
    background: var(--danger);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.flex-demo-item:nth-child(5) {
    background: #f59e0b;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

/* Grid Demo */
.grid-demo-container {
    display: grid;
    width: 100%;
    min-height: 300px;
    padding: var(--space-4);
    gap: 16px;
    transition: all 0.3s ease;
}

.grid-demo-item {
    background: var(--accent);
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 8px;
    padding: var(--space-4);
    min-height: 60px;
}

/* Box Model Demo */
.boxmodel-demo {
    position: relative;
    background: rgba(239, 68, 68, 0.3);
    border: 3px dashed var(--danger);
    transition: all 0.3s ease;
}

.boxmodel-demo-inner {
    background: rgba(56, 189, 248, 0.3);
    border: 3px dashed var(--accent);
    transition: all 0.3s ease;
}

.boxmodel-demo-content {
    background: var(--success);
    color: var(--bg-primary);
    padding: var(--space-4);
    font-weight: bold;
    text-align: center;
}

.boxmodel-label {
    position: absolute;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
}

.label-margin {
    top: 4px;
    left: 4px;
    background: var(--danger);
    color: white;
}

.label-padding {
    top: 4px;
    right: 4px;
    background: var(--accent);
    color: var(--bg-primary);
}

.label-content {
    background: var(--success);
    color: var(--bg-primary);
}

/* ========================================
   Syntax Highlighting for Code Blocks
   ======================================== */

/* Code Block Container */
.code-block,
.code-preview {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: #0d0d0d;
    padding: 16px;
    border-radius: 8px;
    color: #d4d4d4;
    overflow-x: auto;
    margin-bottom: 16px;
    line-height: 1.6;
}

.code-preview {
    border-radius: 0 0 8px 8px;
    margin-bottom: 0;
}

.code-preview pre {
    margin: 0;
}

/* Syntax Highlighting Classes */
.keyword {
    color: #c678dd;
    /* purple - セレクタ、キーワード */
}

.tag {
    color: #e06c75;
    /* red - HTMLタグ */
}

.attr {
    color: #d19a66;
    /* orange - プロパティ名 */
}

.val {
    color: #98c379;
    /* green - 値 */
}

.comment {
    color: #7f8c8d;
    /* gray - コメント */
    font-style: italic;
}