@import url("https://fonts.googleapis.com/css2?family=Literata:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&family=EB+Garamond:ital,wght@1,400;1,500;1,600;1,700&family=Courier+Prime:ital,wght@0,400;0,700;1,400;1,700&display=swap");

:root {
    color-scheme: light dark;
    --reading-measure: 75ch;
    --bg-light: #f9f9f9;
    --text-light: #333;
    --surface-light: #fff;
    --border-light: #eee;
    --shadow-light: rgba(0,0,0,0.1);
    --link-light: #0066cc;
    --link-hover-light: #004999;
    --gateway-link-light: #004080;
    --gateway-link-hover-light: #002f5f;
    --muted-light: #777;
    --toggle-bg-light: #e6e6e6;
    --toggle-border-light: #cfd6e0;
    --toggle-knob-light: #fff;
    --toggle-shadow-light: rgba(0,0,0,0.2);
    --toggle-active-bg-light: #2b7cff;
    --toggle-active-border-light: #2b7cff;
    --toggle-active-knob-light: #fff;
    --bg-dark: #0f1115;
    --text-dark: #e6e6e6;
    --surface-dark: #151a21;
    --border-dark: #2a3442;
    --shadow-dark: rgba(0,0,0,0.6);
    --link-dark: #7ab7ff;
    --link-hover-dark: #a4ceff;
    --gateway-link-dark: #9ecbff;
    --gateway-link-hover-dark: #c3e0ff;
    --muted-dark: #9aa3b2;
    --toggle-bg-dark: #1f2631;
    --toggle-border-dark: #364155;
    --toggle-knob-dark: #e6e6e6;
    --toggle-shadow-dark: rgba(0,0,0,0.45);
    --toggle-active-bg-dark: #7ab7ff;
    --toggle-active-border-dark: #7ab7ff;
    --toggle-active-knob-dark: #0f1115;
}

body {
    --bg: var(--bg-light);
    --text: var(--text-light);
    --surface: var(--surface-light);
    --border: var(--border-light);
    --shadow: var(--shadow-light);
    --link: var(--link-light);
    --link-hover: var(--link-hover-light);
    --gateway-link: var(--gateway-link-light);
    --gateway-link-hover: var(--gateway-link-hover-light);
    --muted: var(--muted-light);
    --toggle-bg: var(--toggle-bg-light);
    --toggle-border: var(--toggle-border-light);
    --toggle-knob: var(--toggle-knob-light);
    --toggle-shadow: var(--toggle-shadow-light);
    --toggle-active-bg: var(--toggle-active-bg-light);
    --toggle-active-border: var(--toggle-active-border-light);
    --toggle-active-knob: var(--toggle-active-knob-light);
    font-family: "Literata", serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    margin: 0;
    padding: 0;
}

@media (prefers-color-scheme: dark) {
    body {
        --bg: var(--bg-dark);
        --text: var(--text-dark);
        --surface: var(--surface-dark);
        --border: var(--border-dark);
        --shadow: var(--shadow-dark);
        --link: var(--link-dark);
        --link-hover: var(--link-hover-dark);
        --gateway-link: var(--gateway-link-dark);
        --gateway-link-hover: var(--gateway-link-hover-dark);
        --muted: var(--muted-dark);
        --toggle-bg: var(--toggle-bg-dark);
        --toggle-border: var(--toggle-border-dark);
        --toggle-knob: var(--toggle-knob-dark);
        --toggle-shadow: var(--toggle-shadow-dark);
        --toggle-active-bg: var(--toggle-active-bg-dark);
        --toggle-active-border: var(--toggle-active-border-dark);
        --toggle-active-knob: var(--toggle-active-knob-dark);
    }
}

html:not([data-theme]) body:has(.theme-toggle:checked) {
    --bg: var(--bg-dark);
    --text: var(--text-dark);
    --surface: var(--surface-dark);
    --border: var(--border-dark);
    --shadow: var(--shadow-dark);
    --link: var(--link-dark);
    --link-hover: var(--link-hover-dark);
    --gateway-link: var(--gateway-link-dark);
    --gateway-link-hover: var(--gateway-link-hover-dark);
    --muted: var(--muted-dark);
    --toggle-bg: var(--toggle-bg-dark);
    --toggle-border: var(--toggle-border-dark);
    --toggle-knob: var(--toggle-knob-dark);
    --toggle-shadow: var(--toggle-shadow-dark);
    --toggle-active-bg: var(--toggle-active-bg-dark);
    --toggle-active-border: var(--toggle-active-border-dark);
    --toggle-active-knob: var(--toggle-active-knob-dark);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme]) body:has(.theme-toggle:checked) {
        --bg: var(--bg-light);
        --text: var(--text-light);
        --surface: var(--surface-light);
        --border: var(--border-light);
        --shadow: var(--shadow-light);
        --link: var(--link-light);
        --link-hover: var(--link-hover-light);
        --gateway-link: var(--gateway-link-light);
        --gateway-link-hover: var(--gateway-link-hover-light);
        --muted: var(--muted-light);
        --toggle-bg: var(--toggle-bg-light);
        --toggle-border: var(--toggle-border-light);
        --toggle-knob: var(--toggle-knob-light);
        --toggle-shadow: var(--toggle-shadow-light);
        --toggle-active-bg: var(--toggle-active-bg-light);
        --toggle-active-border: var(--toggle-active-border-light);
        --toggle-active-knob: var(--toggle-active-knob-light);
    }
}

html[data-theme="light"] body {
    --bg: var(--bg-light);
    --text: var(--text-light);
    --surface: var(--surface-light);
    --border: var(--border-light);
    --shadow: var(--shadow-light);
    --link: var(--link-light);
    --link-hover: var(--link-hover-light);
    --gateway-link: var(--gateway-link-light);
    --gateway-link-hover: var(--gateway-link-hover-light);
    --muted: var(--muted-light);
    --toggle-bg: var(--toggle-bg-light);
    --toggle-border: var(--toggle-border-light);
    --toggle-knob: var(--toggle-knob-light);
    --toggle-shadow: var(--toggle-shadow-light);
    --toggle-active-bg: var(--toggle-active-bg-light);
    --toggle-active-border: var(--toggle-active-border-light);
    --toggle-active-knob: var(--toggle-active-knob-light);
}

html[data-theme="dark"] body {
    --bg: var(--bg-dark);
    --text: var(--text-dark);
    --surface: var(--surface-dark);
    --border: var(--border-dark);
    --shadow: var(--shadow-dark);
    --link: var(--link-dark);
    --link-hover: var(--link-hover-dark);
    --gateway-link: var(--gateway-link-dark);
    --gateway-link-hover: var(--gateway-link-hover-dark);
    --muted: var(--muted-dark);
    --toggle-bg: var(--toggle-bg-dark);
    --toggle-border: var(--toggle-border-dark);
    --toggle-knob: var(--toggle-knob-dark);
    --toggle-shadow: var(--toggle-shadow-dark);
    --toggle-active-bg: var(--toggle-active-bg-dark);
    --toggle-active-border: var(--toggle-active-border-dark);
    --toggle-active-knob: var(--toggle-active-knob-dark);
}

blockquote,
em,
i {
    font-family: "EB Garamond", serif;
    font-style: italic;
}

code,
pre,
kbd,
samp {
    font-family: "Courier Prime", "Courier New", monospace;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: var(--surface);
    box-shadow: 0 0 10px var(--shadow);
}

header {
    border-bottom: 2px solid var(--border);
    margin-bottom: 20px;
    text-align: center;
}

.site-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    text-decoration: none;
}

.site-logo img {
    display: block;
    width: 72px;
    aspect-ratio: 996 / 952;
    object-fit: contain;
    height: auto;
}

.site-logo .site-logo-light {
    display: block;
}

.site-logo .site-logo-dark {
    display: none;
}

@media (prefers-color-scheme: dark) {
    .site-logo .site-logo-light {
        display: none;
    }

    .site-logo .site-logo-dark {
        display: block;
    }
}

html:not([data-theme]) body:has(.theme-toggle:checked) .site-logo .site-logo-light {
    display: none;
}

html:not([data-theme]) body:has(.theme-toggle:checked) .site-logo .site-logo-dark {
    display: block;
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme]) body:has(.theme-toggle:checked) .site-logo .site-logo-light {
        display: block;
    }

    html:not([data-theme]) body:has(.theme-toggle:checked) .site-logo .site-logo-dark {
        display: none;
    }
}

html[data-theme="light"] .site-logo .site-logo-light {
    display: block;
}

html[data-theme="light"] .site-logo .site-logo-dark {
    display: none;
}

html[data-theme="dark"] .site-logo .site-logo-light {
    display: none;
}

html[data-theme="dark"] .site-logo .site-logo-dark {
    display: block;
}

.site-logo:focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 3px;
    border-radius: 4px;
}

header nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin: 16px 0 0;
}

header nav a {
    text-decoration: none;
    color: var(--link);
    font-weight: bold;
}

header nav a:hover {
    text-decoration: underline;
    color: var(--link-hover);
}

.hero-subtitle {
    margin-top: 0.3rem;
    color: var(--muted);
    font-size: 1.05rem;
}

h1.title {
    font-size: 2.5em;
    margin-top: 0;
}

header nav.chapter-breadcrumb {
    justify-content: center;
    gap: 6px;
    margin: 8px 0 0;
    font-size: 0.9em;
    color: var(--muted);
}

header nav.chapter-breadcrumb a {
    font-weight: normal;
}

header nav.chapter-breadcrumb span {
    color: var(--muted);
}

main {
    font-size: 1.1em;
    max-width: var(--reading-measure);
    margin: 0 auto;
}

footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.9em;
    color: var(--muted);
}

nav.navigation {
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
}

.chapter-subscribe {
    text-align: center;
    margin: 12px 0 0;
}

.nav-link {
    text-decoration: none;
    color: var(--link);
    font-weight: bold;
}

.nav-link:hover {
    text-decoration: underline;
    color: var(--link-hover);
}

.nav-link.disabled {
    color: var(--muted);
    pointer-events: none;
}

.theme-toggle-wrapper {
    display: flex;
    justify-content: flex-end;
    margin-top: 16px;
}

.theme-toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    color: var(--muted);
    font-size: 0.9em;
}

.theme-toggle {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
}

.theme-toggle-control {
    width: 40px;
    height: 22px;
    background: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    border-radius: 999px;
    position: relative;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.theme-toggle-control::after {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--toggle-knob);
    box-shadow: 0 1px 2px var(--toggle-shadow);
    transition: transform 0.2s ease, background 0.2s ease;
}

.theme-toggle:checked + .theme-toggle-control {
    background: var(--toggle-active-bg);
    border-color: var(--toggle-active-border);
}

.theme-toggle:checked + .theme-toggle-control::after {
    transform: translateX(18px);
    background: var(--toggle-active-knob);
}

.theme-toggle:focus-visible + .theme-toggle-control {
    outline: 2px solid var(--link);
    outline-offset: 3px;
}

.feature-grid {
    display: grid;
    gap: 1rem;
}

.gateway-hook {
    font-size: 1.08em;
}

.gateway-paths {
    display: grid;
    gap: 1rem;
}

.gateway-card {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem 1.2rem;
    background-color: var(--bg);
}

.gateway-card h3 {
    margin-top: 0;
}

.gateway-card a {
    color: var(--gateway-link);
    text-underline-offset: 0.12em;
}

.gateway-card a:hover,
.gateway-card a:focus-visible {
    color: var(--gateway-link-hover);
}

.gateway-card-primary {
    border-left: 4px solid var(--link);
}

.gateway-card-quiet {
    background-color: var(--surface);
}

.button-link {
    display: inline-block;
    padding: 0.45rem 0.75rem;
    border: 1px solid var(--link);
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    color: var(--surface);
    background-color: var(--link);
}

.gateway-card a.button-link,
.gateway-card a.button-link:visited {
    color: var(--surface);
}

.button-link:hover,
.button-link:focus-visible {
    color: var(--surface);
    background-color: var(--link-hover);
    text-decoration: none;
}

.gateway-card a.button-link:hover,
.gateway-card a.button-link:focus-visible {
    color: var(--surface);
}

.status-line {
    margin-top: 0.85rem;
    padding: 0.65rem 0.8rem;
    border-left: 3px solid var(--link);
    background-color: color-mix(in srgb, var(--surface) 88%, var(--link) 12%);
}

.toc-grid {
    display: grid;
    gap: 0.9rem;
    margin: 1rem 0;
}

.toc-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.9rem 1rem;
    background-color: var(--bg);
}

.toc-card h3 {
    margin-top: 0;
}

.toc-card ol {
    margin: 0.4rem 0 0;
    padding-left: 1.2rem;
}

.muted-note {
    color: var(--muted);
    margin-bottom: 0.25rem;
}

.site-version-footer {
    margin-top: 2rem;
}

.buffer-indicator {
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--bg);
}

.buffer-indicator h2 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
}

.buffer-indicator-progress {
    display: block;
    width: 100%;
    height: 0.9rem;
    margin: 0;
    accent-color: var(--link);
}

.buffer-indicator-progress::-webkit-progress-bar {
    background-color: var(--surface);
    border-radius: 999px;
}

.buffer-indicator-progress::-webkit-progress-value {
    border-radius: 999px;
}

.buffer-indicator-progress::-moz-progress-bar {
    border-radius: 999px;
}

.buffer-indicator-summary {
    margin: 0.5rem 0 0;
    color: var(--muted);
    font-size: 0.9em;
}

@media (max-width: 640px) {
    body {
        font-size: 1.05rem;
    }

    .container {
        margin: 20px 10px;
        padding: 18px;
    }

    header nav {
        font-size: 1.02em;
    }
}

@media (min-width: 800px) {
    .feature-grid {
        grid-template-columns: 1fr 1fr;
    }

    .gateway-paths {
        grid-template-columns: 1.15fr 1fr;
    }

    .toc-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}