body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    line-height: 1.6;
    color: #24292e;
    margin: 0;
    padding: 0;
    background-color: #f6f8fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    min-height: 100vh;
}

header {
    border-bottom: 1px solid #eaecef;
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 0.5rem;
    color: #0366d6;
}

h2 {
    font-size: 1.75em;
    border-bottom: 1px solid #eaecef;
    padding-bottom: 0.3em;
    margin-top: 2rem;
}

h3 {
    font-size: 1.4em;
    margin-top: 1.5rem;
    color: #24292e;
}

h4 {
    font-size: 1.1em;
    margin-top: 1rem;
    font-weight: 600;
}

a {
    color: #0366d6;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

nav {
    margin-bottom: 2rem;
    background-color: #f1f8ff;
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid #c8e1ff;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

nav li {
    display: inline;
}

nav a {
    font-weight: 600;
    color: #0366d6;
    padding: 0.5rem 0.8rem;
    border-radius: 4px;
}

nav a:hover, nav a.active {
    background-color: #0366d6;
    color: white;
    text-decoration: none;
}

code {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 85%;
    background-color: #f6f8fa;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    color: #24292e;
}

pre {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 85%;
    background-color: #f6f8fa;
    padding: 16px;
    border-radius: 3px;
    overflow: auto;
    line-height: 1.45;
    border: 1px solid #eaecef;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 1rem;
}

table th, table td {
    border: 1px solid #dfe2e5;
    padding: 0.6rem 1rem;
    text-align: left;
}

table th {
    background-color: #f6f8fa;
    font-weight: 600;
}

table tr:nth-child(2n) {
    background-color: #f8f8f8;
}

.struct-member {
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 2px solid #e1e4e8;
}

.api-function {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    background-color: #fff;
}

.api-signature {
    font-family: monospace;
    background-color: #f1f8ff;
    padding: 0.8rem;
    border-radius: 4px;
    border-left: 4px solid #0366d6;
    margin-bottom: 1rem;
    font-weight: 600;
    overflow-x: auto;
}

.param-list {
    margin-left: 1.5rem;
}

.note {
    background-color: #fffbdd;
    border-left: 4px solid #ffcc00;
    padding: 1rem;
    margin: 1rem 0;
}

.footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid #eaecef;
    text-align: center;
    color: #586069;
    font-size: 0.9em;
}

/* Syntax Highlighting Sim */
.hljs-keyword { color: #d73a49; }
.hljs-type { color: #6f42c1; }
.hljs-string { color: #032f62; }
.hljs-comment { color: #6a737d; }
.hljs-number { color: #005cc5; }

/* Gallery Styles */
.image-gallery {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    margin-top: 1rem;
}

figure {
    margin: 0;
    text-align: center;
    border: 1px solid #e1e4e8;
    padding: 1rem;
    border-radius: 6px;
    background-color: #ffffff;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    max-width: 100%;
}

figure img {
    border-radius: 4px;
}

figcaption {
    margin-top: 0.5rem;
    font-style: italic;
    color: #586069;
}

/* Tab Styles */
.tab-buttons {
    display: flex;
    border-bottom: 2px solid #eaecef;
    margin-bottom: 2rem;
}

.tab-button {
    padding: 10px 20px;
    border: none;
    background: none;
    font-size: 1.1em;
    font-weight: 600;
    color: #586069;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s ease;
}

.tab-button:hover {
    color: #0366d6;
}

.tab-button.active {
    color: #0366d6;
    border-bottom-color: #0366d6;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

/* ── Introduction section redesign ─────────────────────────────────── */

.intro-lead {
    font-size: 1.12em;
    line-height: 1.75;
    background: linear-gradient(135deg, #f1f8ff 0%, #e8f4fd 100%);
    border-left: 4px solid #0366d6;
    padding: 1.25rem 1.5rem;
    border-radius: 0 8px 8px 0;
    margin: 1.5rem 0 2rem 0;
    color: #24292e;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 0 0 2rem 0;
}

.stat-card {
    padding: 1.5rem 1rem;
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    color: white;
}

.stat-card:nth-child(1) { background: linear-gradient(135deg, #0366d6, #0052b3); }
.stat-card:nth-child(2) { background: linear-gradient(135deg, #28a745, #1e7e34); }
.stat-card:nth-child(3) { background: linear-gradient(135deg, #6f42c1, #5a32a0); }

.stat-value {
    font-size: 2.2em;
    font-weight: 700;
    line-height: 1;
}

.stat-value sup {
    font-size: 0.55em;
    vertical-align: super;
}

.stat-label {
    font-size: 0.82em;
    opacity: 0.92;
    line-height: 1.3;
}

figure.hero-figure {
    background: linear-gradient(135deg, #f8fbff, #ffffff);
    border: 1px solid #c8e1ff;
    box-shadow: 0 4px 16px rgba(3, 102, 214, 0.1);
    padding: 2rem;
    margin: 0 0 2rem 0;
}

figure.hero-figure img {
    max-width: 85%;
}

.callout-box {
    background: #fffbdd;
    border-left: 4px solid #f6b73c;
    padding: 1.1rem 1.5rem;
    border-radius: 0 8px 8px 0;
    margin: 0 0 2rem 0;
}

.callout-box .callout-title {
    display: block;
    font-weight: 700;
    font-size: 1.0em;
    color: #7d5a00;
    margin-bottom: 0.5rem;
}

.callout-box p {
    margin: 0;
    color: #4a3800;
    line-height: 1.65;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin: 0 0 2rem 0;
}

.feature-card {
    border: 1px solid #e1e4e8;
    border-top: 3px solid #0366d6;
    border-radius: 0 0 8px 8px;
    padding: 1.4rem;
    background: #ffffff;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.feature-card:nth-child(2) { border-top-color: #28a745; }
.feature-card:nth-child(3) { border-top-color: #6f42c1; }

.feature-card:hover {
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
}

.feature-card h4 {
    margin-top: 0;
    margin-bottom: 0.6rem;
    font-size: 1.02em;
    color: #0366d6;
}

.feature-card:nth-child(2) h4 { color: #28a745; }
.feature-card:nth-child(3) h4 { color: #6f42c1; }

.feature-card p {
    margin: 0;
    font-size: 0.93em;
    color: #444d56;
    line-height: 1.6;
}

.citation-block {
    background: #f6f8fa;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 1rem 1.25rem;
    font-size: 0.91em;
    color: #586069;
    margin: 0 0 1rem 0;
    line-height: 1.65;
}

.citation-block .citation-label {
    font-weight: 700;
    color: #24292e;
    margin-right: 0.25rem;
}

@media (max-width: 760px) {
    .stats-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }
}