body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #24292e;
    max-width: 60rem;
    margin: 0 auto;
    padding: 2rem;
    background-color: #f6f8fa;
}

header {
    border-bottom: 1px solid #e1e4e8;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
}

nav a {
    color: #0366d6;
    text-decoration: none;
    font-weight: bold;
}

.container {
    background-color: #ffffff;
    padding: 2rem;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
}

h1, h2, h3 {
    border-bottom: 1px solid #eaecef;
    padding-bottom: .3em;
}

code {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    background-color: rgba(27, 31, 35, 0.05);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 85%;
}

pre {
    background-color: #272822;
    color: #f8f8f2;
    padding: 16px;
    overflow: auto;
    border-radius: 3px;
    line-height: 1.45;
}

pre code {
    background-color: transparent;
    padding: 0;
    font-size: 100%;
}

footer {
    margin-top: 2rem;
    text-align: center;
    color: #6a737d;
    font-size: 0.8rem;
}

/* Table Styles */
table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5rem 0;
}

table th, table td {
    border: 1px solid #dfe2e5;
    padding: 12px 15px;
    text-align: left;
}

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

table tr:nth-child(even) {
    background-color: #f8f8fa;
}

/* Code block container */
.codehilite {
    position: relative;
}

/* Copy button */
.copy-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    padding: 4px 8px;
    font-size: 12px;
    background-color: #444;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.copy-btn:hover {
    opacity: 1;
    background-color: #666;
}

/* Download button */
.example-links {
    margin-top: -15px;
    margin-bottom: 20px;
    text-align: right;
}

.download-btn {
    display: inline-block;
    padding: 6px 12px;
    font-size: 13px;
    background-color: #e1e4e8;
    color: #24292e;
    text-decoration: none;
    border-radius: 4px;
    border: 1px solid #d1d5da;
}

.download-btn:hover {
    background-color: #d1d5da;
}

/* Tabs for versions */
.example-versions {
    margin: 20px 0;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    overflow: hidden;
}

.tab-buttons {
    background-color: #f6f8fa;
    border-bottom: 1px solid #e1e4e8;
    display: flex;
}

.tab-btn {
    background: none;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-weight: 600;
    color: #586069;
    border-right: 1px solid #e1e4e8;
}

.tab-btn:hover {
    background-color: #e1e4e8;
}

.tab-btn.active {
    background-color: #fff;
    color: #24292e;
    border-bottom: 2px solid #f9826c;
}

.tab-content {
    padding: 15px;
    background-color: #fff;
}

/* GPU profiling comparison tabs: same chrome as .example-versions, with a
   distinct accent so device-comparison tabs read differently from code tabs. */
.gpu-tabs .tab-btn.active {
    border-bottom-color: #0366d6;
}

.gpu-tabs .tab-content > .ncu-chart-container:first-child {
    margin-top: 4px;
}

/* NCU Metrics and Charts */
.ncu-metric {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-weight: bold;
    color: #d73a49;
    background-color: #fffbdd;
    padding: 2px 4px;
    border-radius: 3px;
}

table .ncu-metric {
    font-weight: normal;
    color: #24292e;
    background-color: transparent;
    padding: 0;
}

.ncu-chart-container {
    margin: 20px 0;
    overflow-x: auto;
}

.ncu-chart-table {
    min-width: 500px;
}

.bar-wrapper {
    position: relative;
    height: 20px;
    width: 100%;
    background-color: #f1f1f1;
    border-radius: 3px;
}

.bar {
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 3px;
}

.bar.actual {
    background-color: #28a745;
    opacity: 0.8;
}

.bar.baseline {
    background-color: #0366d6;
    opacity: 0.5;
    z-index: 1;
}

.ncu-error {
    color: #cb2431;
    background-color: #ffeef0;
    padding: 10px;
    border: 1px solid #d73a49;
    border-radius: 6px;
    margin: 10px 0;
}

/* Exercise Block */
.exercise-block {
    background-color: #f1f8ff;
    border: 1px solid #c8e1ff;
    border-radius: 6px;
    padding: 20px;
    margin: 30px 0;
}

.exercise-block h3 {
    margin-top: 0;
    color: #0366d6;
    border-bottom-color: #c8e1ff;
}

.exercise-actions {
    margin-bottom: 15px;
}

.exercise-code {
    margin: 15px 0;
}

.exercise-instructions {
    background-color: #fff;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 15px;
    font-size: 0.9em;
}

.exercise-instructions pre {
    margin-bottom: 0;
    margin-top: 10px;
}

/* ── Disclosure blocks ────────────────────────────────────────────────────── */

/* Shared summary reset */
details summary {
    cursor: pointer;
    list-style: none;
    user-select: none;
}
details summary::-webkit-details-marker { display: none; }

/* Chevron via ::before on the symbol span */
details summary .di-sym {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
}
details summary .di-sym::before {
    content: '›';
    font-size: 1.1em;
    font-weight: 400;
    display: inline-block;
    transition: transform 0.15s;
    line-height: 1;
}
details[open] summary .di-sym::before {
    transform: rotate(90deg);
}

/* ── ✦ Solution ── */
details.solution {
    border: 1px solid #c8e1ff;
    border-radius: 0 6px 6px 6px;
    background: #f1f8ff;
    margin: 0.4rem 0;
    overflow: hidden;
}
details.solution summary {
    padding: 8px 12px;
    color: #0366d6;
}
details.solution[open] {
    background: #fff;
}
details.solution .di-body {
    padding: 10px 16px 14px;
    border-top: 1px solid #c8e1ff;
}

/* Question block that precedes a solution */
.exercise-question {
    border-left: 3px solid #0366d6;
    border-radius: 0 6px 0 0;
    padding: 10px 14px;
    margin: 1.25rem 0 0;
    background: #f1f8ff;
    font-style: italic;
}
.exercise-question + details.solution {
    margin-top: 0;
    border-top: none;
    border-radius: 0 0 6px 6px;
}

/* ── 📊 Profiling ── */
details.profiling {
    border: 1px solid #d4d4d4;
    border-radius: 6px;
    background: #f6f8fa;
    margin: 0.4rem 0;
    overflow: hidden;
}
details.profiling summary {
    padding: 7px 12px;
    color: #57606a;
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 13px;
}
details.profiling .di-body {
    padding: 10px 16px 14px;
    border-top: 1px dashed #d4d4d4;
    font-size: 13px;
    color: #57606a;
}

/* ── ※ Aside ── */
details.aside {
    border-left: 3px solid #e36209;
    border-radius: 0;
    background: transparent;
    margin: 0.6rem 0;
}
details.aside summary {
    padding: 4px 10px;
    color: #e36209;
}
details.aside .di-body {
    padding: 6px 10px 10px 10px;
    color: #57606a;
}

/* ── Advanced: styled as its own collapsible section, not an inline note ── */
details.advanced {
    border: none;
    background: transparent;
    margin: 2.25rem 0 1.5rem;
}
details.advanced > summary {
    padding: 0 0 0.3em 0;
    border-bottom: 1px solid #eaecef;   /* same divider as h1/h2/h3 */
    color: #24292e;
}
details.advanced > summary .di-sym {
    font-size: 1.3rem;                  /* heading scale (between h2 and h3) */
    font-weight: 600;
}
details.advanced .adv-badge {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #6f42c1;
    background: #f3effc;
    border: 1px solid #e0d4f7;
    border-radius: 4px;
    padding: 1px 7px;
    align-self: center;
}
details.advanced > .di-body {
    padding: 0.6rem 0 0 0;              /* flush with the document body */
}

/* ── ⚠ Warning (non-collapsible) ── */
.warning {
    border-left: 3px solid #b45309;
    border-radius: 0 6px 6px 0;
    background: #fffbeb;
    padding: 10px 14px;
    margin: 1rem 0;
}
.warning .warning-title {
    color: #b45309;
    font-weight: 600;
    margin: 0 0 6px;
}
.warning .warning-title::before {
    content: '⚠ ';
}

/* Syntax Highlighting */
/* The styles are imported from pygments.css */