:root {
    --accent: hsl(211 82% 52%);
    --background: #ffffff;
    --surface: #f9f9f9;
    --raised: #f4f4f4;
    --line: rgba(0, 0, 0, 0.08);
    --text: #0d0d0d;
    --muted: #5d5d5d;
    --faint: #8f8f8f;
    --code: #f4f4f4;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 12px 40px rgba(0, 0, 0, 0.08);
    --font:
        -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI Variable Text", "Segoe UI",
        system-ui, sans-serif;
    --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
    --width: 1080px;
    --prose: 720px;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --accent: hsl(211 82% 62%);
        --background: #212121;
        --surface: #181818;
        --raised: #2a2a2a;
        --line: rgba(255, 255, 255, 0.08);
        --text: #ececec;
        --muted: #afafaf;
        --faint: #7b7b7b;
        --code: #2a2a2a;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 16px 48px rgba(0, 0, 0, 0.45);
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font: 16px / 1.6 var(--font);
    -webkit-font-smoothing: antialiased;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 16px;
    padding: 8px 12px;
    border-radius: 8px;
    background: var(--text);
    color: var(--background);
}

.skip-link:focus {
    top: 12px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--background) 85%, transparent);
    backdrop-filter: saturate(1.4) blur(16px);
}

.site-header .inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px 24px;
    max-width: var(--width);
    margin: 0 auto;
    padding: 14px 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 17px;
    font-weight: 600;
}

.brand:hover {
    text-decoration: none;
}

.brand img {
    border-radius: 6px;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.site-nav a {
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 14px;
}

.site-nav a:hover {
    background: var(--raised);
    color: var(--text);
    text-decoration: none;
}

.site-nav a[aria-current="page"] {
    background: var(--raised);
    color: var(--text);
}

main {
    max-width: var(--width);
    margin: 0 auto;
    padding: 0 20px;
}

.hero {
    padding: 88px 0 48px;
    text-align: center;
}

.hero h1 {
    margin: 0 auto;
    max-width: 780px;
    font-size: clamp(34px, 6vw, 56px);
    line-height: 1.08;
    letter-spacing: -0.025em;
}

.hero p {
    margin: 20px auto 0;
    max-width: 600px;
    color: var(--muted);
    font-size: 19px;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}

.button {
    display: inline-flex;
    align-items: center;
    padding: 11px 22px;
    border-radius: 999px;
    background: var(--text);
    color: var(--background);
    font-size: 15px;
    font-weight: 500;
}

.button.secondary {
    background: var(--raised);
    color: var(--text);
}

.button:hover {
    text-decoration: none;
    opacity: 0.88;
}

.screenshot {
    margin: 0;
}

.screenshot img {
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
}

.screenshot figcaption {
    margin-top: 12px;
    color: var(--faint);
    font-size: 13px;
    text-align: center;
}

.section {
    padding: 72px 0 0;
}

.section > h2,
.prose h2 {
    margin: 0 0 8px;
    font-size: 26px;
    letter-spacing: -0.015em;
}

.section > .lead {
    margin: 0 0 32px;
    max-width: var(--prose);
    color: var(--muted);
    font-size: 17px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.features li {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface);
}

.features h3 {
    margin: 0 0 6px;
    font-size: 16px;
}

.features p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.notice {
    margin: 32px 0 0;
    padding: 16px 20px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
    color: var(--muted);
    font-size: 15px;
}

.notice strong {
    color: var(--text);
}

.page-head {
    max-width: var(--prose);
    padding: 64px 0 8px;
}

.page-head h1 {
    margin: 0;
    font-size: clamp(30px, 5vw, 42px);
    letter-spacing: -0.02em;
}

.page-head p {
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 18px;
}

.prose {
    max-width: var(--prose);
    padding-bottom: 24px;
}

.prose h2 {
    margin-top: 48px;
}

.prose h3 {
    margin: 32px 0 6px;
    font-size: 18px;
}

.prose p,
.prose li {
    color: var(--muted);
}

.prose strong {
    color: var(--text);
}

.prose ul,
.prose ol {
    padding-left: 22px;
}

.formula {
    margin: 16px 0;
    padding: 14px 18px;
    overflow-x: auto;
    border-radius: 10px;
    background: var(--code);
    color: var(--text);
    font-family: "Times New Roman", Times, serif;
    font-size: 19px;
    white-space: nowrap;
}

.formula var {
    font-style: italic;
}

code,
pre {
    font-family: var(--mono);
    font-size: 14px;
}

code {
    padding: 2px 6px;
    border-radius: 5px;
    background: var(--code);
    color: var(--text);
}

pre {
    margin: 16px 0;
    padding: 16px 18px;
    overflow-x: auto;
    border-radius: 10px;
    background: var(--code);
    color: var(--text);
    line-height: 1.55;
}

pre code {
    padding: 0;
    background: none;
}

.table-frame {
    margin: 16px 0;
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
}

th,
td {
    padding: 12px 16px;
    text-align: left;
    vertical-align: top;
}

thead th {
    background: var(--surface);
    color: var(--muted);
    font-size: 13px;
    font-weight: 500;
}

tbody tr + tr > * {
    border-top: 1px solid var(--line);
}

tbody th {
    color: var(--text);
    font-weight: 500;
    white-space: nowrap;
}

tbody td {
    color: var(--muted);
}

.site-footer {
    margin-top: 96px;
    border-top: 1px solid var(--line);
    color: var(--faint);
    font-size: 14px;
}

.site-footer .inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px 24px;
    max-width: var(--width);
    margin: 0 auto;
    padding: 28px 20px 40px;
}

.site-footer a {
    color: var(--muted);
}

.not-found {
    padding: 120px 0 40px;
    text-align: center;
}

.not-found h1 {
    margin: 0;
    font-size: 48px;
}

.not-found p {
    color: var(--muted);
}

@media (max-width: 640px) {
    .hero {
        padding-top: 56px;
    }

    .hero p {
        font-size: 17px;
    }

    .section {
        padding-top: 56px;
    }

    .formula {
        font-size: 17px;
    }
}