:root {
    color-scheme: dark;
    --font-sans: "Geist", sans-serif;
    --bg: #000000;
    --bg-elevated: rgba(18, 18, 20, 0.92);
    --bg-panel: rgba(22, 22, 24, 0.88);
    --bg-card: rgba(17, 17, 19, 0.94);
    --bg-hover: rgba(255, 255, 255, 0.06);
    --text: #f2f2f3;
    --text-muted: #9f9fa6;
    --text-faint: #707078;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.13);
    --accent: #f2f2f3;
    --accent-soft: rgba(255, 255, 255, 0.08);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.32);
}

html[data-theme="light"] {
    color-scheme: light;
    --bg: #f5f4f1;
    --bg-elevated: rgba(255, 255, 255, 0.92);
    --bg-panel: rgba(250, 249, 245, 0.9);
    --bg-card: rgba(255, 255, 255, 0.94);
    --bg-hover: rgba(17, 17, 19, 0.05);
    --text: #1a1a1c;
    --text-muted: #616167;
    --text-faint: #898991;
    --border: rgba(17, 17, 19, 0.08);
    --border-strong: rgba(17, 17, 19, 0.14);
    --accent: #111113;
    --accent-soft: rgba(17, 17, 19, 0.06);
    --shadow: 0 20px 48px rgba(24, 24, 28, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background: var(--bg);
}

body {
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
}

a {
    color: inherit;
}

button {
    font: inherit;
}

.page-shell {
    min-height: 100vh;
    min-height: 100dvh;
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 30;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1rem;
    min-height: 54px;
    padding: calc(0.62rem + env(safe-area-inset-top, 0px)) 1.25rem 0.78rem;
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    -webkit-transform: translate3d(0, 0, 0);
    transition: opacity 180ms ease;
}

.topbar__brand,
.topbar__actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.topbar__brand {
    padding-left: 0.85rem;
}

.topbar__actions {
    padding-right: 0.85rem;
}

.topbar__brandmark-image {
    display: none;
    width: auto;
    height: 36px;
    object-fit: contain;
}

html:not([data-theme="light"]) .topbar__brandmark-image--dark {
    display: block;
}

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

.topbar__actions {
    justify-self: end;
}

.control-group {
    display: inline-flex;
    align-items: center;
    gap: 0.22rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.16rem 0.32rem;
    background: var(--bg);
}

.control-group__divider {
    width: 1px;
    align-self: stretch;
    background: var(--border);
    margin: 0 0.1rem;
}

.icon-toggle-button {
    border: 0;
    border-radius: 999px;
    width: 2.32rem;
    height: 2.32rem;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition:
        background-color 140ms ease,
        border-color 140ms ease,
        color 140ms ease;
}

.icon-toggle-button:hover,
.icon-toggle-button:focus-visible {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    color: var(--text);
    outline: none;
}

.icon-toggle-button__icon {
    width: 0.9rem;
    height: 0.9rem;
    fill: currentColor;
    display: block;
    overflow: visible;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    border: 0;
    border-radius: 999px;
    padding: 0;
    background: transparent;
}

.theme-toggle__button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition:
        background-color 140ms ease,
        color 140ms ease;
}

.theme-toggle__icon {
    width: 1.02rem;
    height: 1.02rem;
    fill: currentColor;
    display: block;
}

.theme-toggle__icon--light {
    width: 1.08rem;
    height: 1.08rem;
}

.theme-toggle__icon--dark {
    width: 1.08rem;
    height: 1.08rem;
    transform: translateY(0.5px);
}

.theme-toggle__button:hover,
.theme-toggle__button:focus-visible {
    background: var(--bg-hover);
    color: var(--text);
    outline: none;
}

.theme-toggle__button.is-active {
    background: var(--accent-soft);
    color: var(--text);
}

.workspace {
    position: relative;
    width: min(100%, 92rem);
    margin: 0 auto;
    padding: 1.75rem 1.5rem 1.5rem;
}

.outline-panel {
    position: fixed;
    top: 7.7rem;
    right: max(1.9rem, calc((50vw - 41rem) / 2));
    max-height: calc(100vh - 9.2rem);
    max-height: calc(100dvh - 9.2rem);
    overflow: auto;
    width: 18rem;
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    background: var(--bg-panel);
    box-shadow: var(--shadow);
    padding: 1.1rem 0.75rem 0.8rem;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transform: translateY(0.35rem);
    transition:
        opacity 180ms ease,
        transform 180ms ease;
}

.page-shell[data-outline-open="true"] .outline-panel {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.outline-panel__header {
    padding: 0 0.55rem 0.85rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 0.6rem;
}

.outline-panel__title-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.outline-panel__eyebrow,
.outline-panel__meta {
    margin: 0;
}

.outline-panel__eyebrow {
    font-size: 0.84rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.outline-panel__count-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.42rem;
    height: 1.42rem;
    padding: 0 0.34rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 600;
}

.outline-panel__nav {
    display: flex;
    flex-direction: column;
    gap: 0.12rem;
}

.outline-link {
    display: block;
    width: 100%;
    border-radius: 0.9rem;
    padding: 0.7rem 0.8rem;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.2;
    text-decoration: none;
    transition:
        background-color 140ms ease,
        color 140ms ease,
        transform 140ms ease;
}

.outline-link:hover,
.outline-link:focus-visible {
    background: var(--bg-hover);
    color: var(--text);
    outline: none;
}

.outline-link.is-active {
    background: color-mix(in srgb, var(--accent-soft) 92%, transparent);
    color: var(--text);
}

.outline-link[data-level="3"] {
    padding-left: 1.45rem;
    font-size: 0.88rem;
}

.outline-link[data-level="4"] {
    padding-left: 2rem;
    font-size: 0.85rem;
}

.document-stage {
    min-width: 0;
    transition: opacity 180ms ease;
}

.document-body {
    width: min(100%, 46rem);
    margin: 0 auto;
    padding: clamp(0.5rem, 1vw, 1rem) clamp(0.75rem, 1vw, 1rem) 3rem;
}

.document-body__meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-faint);
    font-size: 0.8rem;
}

.document-body__badge {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.4rem 0.7rem;
    color: var(--text-muted);
}

.document-body__separator {
    width: 1px;
    height: 0.9rem;
    background: var(--border);
}

.document-body__footer {
    margin-bottom: 0;
    color: var(--text-faint);
    font-size: 0.9rem;
}

.markdown-body {
    font-size: 1.02rem;
    line-height: 1.72;
}

.markdown-body > :first-child {
    margin-top: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    scroll-margin-top: 6.3rem;
    letter-spacing: -0.04em;
    line-height: 1.1;
    color: var(--text);
}

.markdown-body h1 {
    margin: 0 0 1.6rem;
    font-size: clamp(2.15rem, 4vw, 3.1rem);
    font-weight: 680;
}

.markdown-body h2 {
    margin: 2.7rem 0 1rem;
    padding-top: 0.15rem;
    font-size: clamp(1.45rem, 2.3vw, 1.9rem);
    font-weight: 650;
}

.markdown-body h3 {
    margin: 2rem 0 0.8rem;
    font-size: 1.18rem;
    font-weight: 630;
}

.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin: 1.6rem 0 0.65rem;
    font-size: 1rem;
    font-weight: 600;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body table {
    margin: 0 0 1.15rem;
}

.markdown-body p,
.markdown-body li {
    color: color-mix(in srgb, var(--text) 88%, var(--text-muted));
}

.markdown-body strong {
    color: var(--text);
    font-weight: 620;
}

.markdown-body em {
    font-style: italic;
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 1.35rem;
}

.markdown-body li {
    padding-left: 0.35rem;
    margin-bottom: 0.55rem;
}

.markdown-body li::marker {
    color: var(--text-faint);
}

.markdown-body a {
    color: var(--text);
    text-decoration: underline;
    text-decoration-color: currentColor;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.16em;
}

.markdown-body a:hover {
    text-decoration-color: var(--text-faint);
}

.markdown-body hr {
    margin: 2rem 0 1.5rem;
    border: 0;
    border-top: 1px solid var(--border);
}

.markdown-body blockquote {
    border-left: 2px solid var(--border-strong);
    padding-left: 1rem;
    color: var(--text-muted);
}

.markdown-body code {
    display: inline-block;
    max-width: 100%;
    overflow-x: auto;
    vertical-align: middle;
    border: 1px solid var(--border);
    border-radius: 0.45rem;
    background: var(--accent-soft);
    padding: 0.12rem 0.34rem;
    font-size: 0.88em;
}

.markdown-body pre {
    max-width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 1rem;
    background: color-mix(in srgb, var(--bg-card) 80%, black 20%);
    padding: 1rem 1.05rem;
}

.markdown-body pre code {
    display: block;
    border: 0;
    background: transparent;
    padding: 0;
    overflow-x: visible;
}

.key-combo {
    display: inline-flex;
    align-items: center;
    gap: 0.28rem;
    white-space: nowrap;
}

.key-sep {
    color: var(--text-faint);
    font-size: 0.76em;
    font-weight: 400;
    user-select: none;
}

.markdown-body kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.7rem;
    padding: 0.15rem 0.42rem;
    border: 1px solid var(--border-strong);
    border-radius: 0.42rem;
    background: var(--bg-elevated);
    box-shadow: 0 1px 0 var(--border-strong);
    color: var(--text);
    font-family: inherit;
    font-size: 0.82em;
    font-weight: 500;
    line-height: 1.5;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 1rem;
}

.markdown-body th,
.markdown-body td {
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0.9rem;
    text-align: left;
}

.markdown-body th {
    color: var(--text);
    font-weight: 600;
}

.markdown-body tr:last-child td {
    border-bottom: 0;
}

.site-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    padding: 0 1.5rem 3rem;
    font-size: 0.78rem;
    color: var(--text-faint);
}

.site-footer a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 140ms ease;
}

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

.footer-sep {
    color: var(--border-strong);
}

@media (max-width: 960px) {
    html.is-scroll-locked,
    html.is-scroll-locked body {
        overflow: hidden !important;
        overscroll-behavior: none;
    }

    .page-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 35;
        background: var(--bg);
        opacity: 0;
        pointer-events: none;
        transition: opacity 180ms ease;
    }

    .page-shell[data-outline-open="true"] .page-overlay {
        opacity: 0.6;
        pointer-events: auto;
    }

    .page-shell[data-outline-open="true"] .topbar,
    .page-shell[data-outline-open="true"] .document-stage {
        opacity: 0;
        pointer-events: none;
    }

    .topbar {
        grid-template-columns: 1fr auto;
    }

    .topbar__brand {
        padding-left: 0;
    }

    .topbar__actions {
        padding-right: 0;
    }

    .workspace {
        display: block;
    }

    .outline-panel {
        position: fixed;
        top: 50%;
        left: 50%;
        right: auto;
        z-index: 40;
        width: min(28rem, calc(100vw - 2rem));
        max-height: calc(100vh - 4rem);
        max-height: calc(100dvh - 4rem);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        background: var(--bg);
        border: 1px solid var(--border-strong);
        border-radius: 1.5rem;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        transform: translate(-50%, -50%) translateY(0.4rem);
        opacity: 0;
        pointer-events: none;
        transition:
            transform 180ms ease,
            opacity 180ms ease;
    }

    .page-shell[data-outline-open="true"] .outline-panel {
        transform: translate(-50%, -50%);
        opacity: 1;
        pointer-events: auto;
    }

    .document-body {
        width: 100%;
    }
}

@media (max-width: 640px) {
    .topbar {
        padding: calc(0.62rem + env(safe-area-inset-top, 0px)) 1.35rem 0.62rem;
        min-height: 50px;
    }

    .topbar__brandmark-image {
        height: 30px;
    }

    .control-group {
        padding: 0.14rem 0.24rem;
    }

    .icon-toggle-button {
        width: 2rem;
        height: 2rem;
    }

    .theme-toggle__button {
        width: 1.76rem;
        height: 1.76rem;
    }

    .icon-toggle-button__icon,
    .theme-toggle__icon {
        width: 0.86rem;
        height: 0.86rem;
    }

    .theme-toggle__icon--light,
    .theme-toggle__icon--dark {
        width: 0.92rem;
        height: 0.92rem;
    }

    .workspace {
        padding: 1rem 0 1rem;
    }

    .document-body {
        padding: 1rem 1.35rem 2rem;
    }

    .markdown-body {
        font-size: 0.98rem;
    }
}