:root {
    color-scheme: light;
    --bg: #edf3f5;
    --bg-accent: #dceceb;
    --surface: rgba(255, 255, 255, 0.8);
    --surface-strong: #ffffff;
    --surface-soft: #f5f8fa;
    --surface-tint: #eef7f6;
    --line: rgba(22, 46, 60, 0.1);
    --line-strong: rgba(22, 46, 60, 0.18);
    --text: #243746;
    --text-strong: #10202d;
    --muted: #667b89;
    --muted-strong: #496070;
    --accent: #0f8f80;
    --accent-strong: #0a7468;
    --accent-soft: rgba(15, 143, 128, 0.12);
    --shadow: 0 18px 50px rgba(24, 53, 73, 0.1);
    --radius-xl: 28px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --sidebar-width: 296px;
    --content-width: 860px;
    --topbar-height: 68px;
}

html[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0a0a0b;
    --bg-accent: #111214;
    --surface: rgba(17, 18, 20, 0.9);
    --surface-strong: #151618;
    --surface-soft: #1b1d20;
    --surface-tint: #202328;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.14);
    --text: #d9dde2;
    --text-strong: #f5f9fb;
    --muted: #9098a2;
    --muted-strong: #b4bcc6;
    --accent: #53c8b6;
    --accent-strong: #6bd7c6;
    --accent-soft: rgba(83, 200, 182, 0.14);
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(15, 143, 128, 0.08), transparent 26%),
        linear-gradient(180deg, var(--bg-accent) 0%, var(--bg) 100%);
    color: var(--text);
    font-family: "Aptos", "Trebuchet MS", "Segoe UI", sans-serif;
    line-height: 1.72;
}

html[data-theme="dark"] body {
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.035), transparent 24%),
        linear-gradient(180deg, var(--bg-accent) 0%, var(--bg) 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

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

button,
input {
    font: inherit;
}

.skip-link,
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link:focus {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 90;
    width: auto;
    height: auto;
    padding: 0.8rem 1rem;
    margin: 0;
    clip: auto;
    border-radius: 999px;
    background: var(--surface-strong);
    border: 1px solid var(--line-strong);
}

.layout {
    display: grid;
    grid-template-columns: minmax(272px, var(--sidebar-width)) minmax(0, 1fr);
    gap: 1.2rem;
    width: min(1400px, calc(100% - 2rem));
    margin: 1rem auto;
    align-items: start;
}

.layout-overlay {
    display: none;
}

.sidebar {
    position: sticky;
    top: 1rem;
    height: calc(100vh - 2rem);
}

.sidebar__inner {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: var(--surface);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow);
}

.sidebar__hero {
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--line);
}

.sidebar__brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.sidebar__brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: var(--surface-tint);
    color: var(--text-strong);
}

.sidebar__brand-copy strong {
    display: block;
    color: var(--text-strong);
    font-size: 1.12rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.sidebar__brand-copy small {
    display: block;
    margin-top: 0.1rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.sidebar__search {
    margin-top: 0.95rem;
}

.sidebar__search input {
    width: 100%;
    padding: 0.85rem 0.95rem;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-soft);
    color: var(--text);
    outline: none;
}

.sidebar__search input::placeholder {
    color: var(--muted);
}

.sidebar__search input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.sidebar__nav {
    flex: 1;
    overflow: auto;
    margin-top: 1rem;
    padding-right: 0.2rem;
}

.sidebar__nav::-webkit-scrollbar {
    width: 8px;
}

.sidebar__nav::-webkit-scrollbar-thumb {
    border-radius: 999px;
    background: var(--line-strong);
}

.nav-group + .nav-group {
    margin-top: 0.9rem;
}

.nav-group__toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.3rem 0.1rem;
    border: 0;
    background: transparent;
    color: var(--text-strong);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: pointer;
}

.nav-group__chevron {
    width: 0.6rem;
    height: 0.6rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s ease;
}

.nav-group.is-open .nav-group__chevron {
    transform: rotate(225deg);
}

.nav-group__items {
    display: none;
    margin-top: 0.55rem;
    padding-left: 0.7rem;
    border-left: 1px solid var(--line);
}

.nav-group.is-open .nav-group__items {
    display: block;
}

.nav-link {
    display: block;
    padding: 0.7rem 0.8rem;
    border-radius: 12px;
    color: var(--muted-strong);
    transition: background-color 0.16s ease, color 0.16s ease;
}

.nav-link + .nav-link {
    margin-top: 0.15rem;
}

.nav-link:hover {
    background: var(--surface-soft);
    color: var(--text-strong);
}

.nav-link.is-active {
    background: var(--surface-tint);
    color: var(--accent);
    box-shadow: inset 0 0 0 1px rgba(15, 143, 128, 0.15);
}

.nav-link--primary {
    padding: 0.35rem 0.1rem;
    border-radius: 0;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-strong);
}

.nav-link--primary:hover,
.nav-link--primary.is-active {
    background: transparent;
}

.layout__main {
    min-width: 0;
}

.topbar {
    position: sticky;
    top: 1rem;
    z-index: 20;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1rem;
    min-height: var(--topbar-height);
    margin-bottom: 1rem;
    padding: 0.8rem 1rem;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow);
}

.topbar__meta {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.topbar__brand {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.topbar__brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: var(--surface-tint);
    color: var(--text-strong);
}

.topbar__brand-copy strong,
.topbar__title {
    display: block;
    color: var(--text-strong);
    font-size: 0.98rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.topbar__brand-copy small,
.topbar__eyebrow {
    display: block;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.topbar__context {
    min-width: 0;
}

.topbar__menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-soft);
    color: var(--text);
}

.topbar__menu-toggle span {
    display: block;
    width: 16px;
    height: 2px;
    margin: 3px 0;
    background: currentColor;
    border-radius: 999px;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-soft);
    color: var(--text);
    cursor: pointer;
}

.theme-toggle__track {
    position: relative;
    display: inline-flex;
    width: 44px;
    height: 24px;
    padding: 2px;
    border-radius: 999px;
    background: var(--accent-soft);
}

.theme-toggle__thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    transition: transform 0.2s ease;
}

html[data-theme="dark"] .theme-toggle__thumb {
    transform: translateX(20px);
}

.theme-toggle__label {
    font-size: 0.86rem;
    font-weight: 700;
}

.content-area {
    padding-bottom: 3rem;
}

.doc-page {
    padding: 1.6rem 1.8rem 2rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: var(--surface);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow);
}

.doc-page__header {
    max-width: 840px;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--line);
}

.doc-page__header--home {
    max-width: 760px;
}

.doc-page__eyebrow {
    display: inline-flex;
    align-items: center;
    padding: 0.34rem 0.65rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.doc-page__header h1,
.doc-page--empty h1 {
    margin: 0.9rem 0 0.7rem;
    color: var(--text-strong);
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.03;
    letter-spacing: -0.04em;
}

.doc-page__summary,
.doc-page__header p {
    max-width: 62ch;
    margin: 0;
    color: var(--muted-strong);
    font-size: 1rem;
}

.doc-page__content {
    max-width: var(--content-width);
    padding-top: 1.5rem;
}

.doc-page__content p,
.doc-page__content li,
.doc-page__content td {
    color: var(--text);
    font-size: 1rem;
}

.doc-page__content p {
    margin: 0 0 1rem;
}

.doc-page__content h2,
.doc-page__content h3,
.doc-page__content h4,
.article-section-label,
.article-subheading {
    margin: 2.5rem 0 0.9rem;
    color: var(--text-strong);
    font-family: Georgia, "Times New Roman", serif;
    line-height: 1.12;
    letter-spacing: -0.03em;
}

.doc-page__content h2,
.article-section-label {
    font-size: clamp(1.65rem, 3vw, 2.2rem);
}

.doc-page__content h3,
.article-subheading {
    font-size: clamp(1.15rem, 2vw, 1.42rem);
}

.article-section-label {
    padding-top: 0.45rem;
    border-top: 1px solid var(--line);
    text-transform: uppercase;
}

.doc-page__content a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: rgba(15, 143, 128, 0.34);
    text-underline-offset: 0.18em;
}

.doc-page__content a:hover {
    color: var(--accent-strong);
}

.doc-page__content ul,
.doc-page__content ol {
    margin: 0 0 1.15rem;
    padding-left: 1.3rem;
}

.article-stack {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.article-block {
    min-width: 0;
}

.article-figure {
    margin: 1.7rem 0;
    padding: 0.95rem;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--surface-soft);
}

.article-figure__media {
    display: grid;
    gap: 0.8rem;
    place-items: center;
    min-height: 210px;
    padding: 1rem;
    border-radius: 16px;
    background:
        linear-gradient(rgba(16, 32, 45, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(16, 32, 45, 0.03) 1px, transparent 1px),
        var(--surface-strong);
    background-size: 24px 24px, 24px 24px, auto;
}

html[data-theme="dark"] .article-figure__media {
    background:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        var(--surface-strong);
}

.article-figure__media img {
    width: auto;
    max-height: 560px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #ffffff;
    box-shadow: 0 12px 32px rgba(16, 32, 45, 0.1);
}

.article-figure__caption {
    margin-top: 0.85rem;
    color: var(--muted);
    font-size: 0.93rem;
}

.article-link-group,
.glossary-entry {
    margin: 1.25rem 0;
    padding: 1rem 1.1rem;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface-soft);
}

.article-link-group__title,
.glossary-entry__term {
    margin: 0 0 0.6rem;
    color: var(--text-strong);
    font-size: 1.08rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.article-link-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.article-link-list__item + .article-link-list__item {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--line);
}

.glossary-entry__definition {
    margin: 0;
}

.doc-page--glossary .doc-page__content {
    max-width: none;
}

.glossary-directory {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.glossary-alphabet {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    padding-bottom: 0.25rem;
}

.glossary-alphabet__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.1rem;
    height: 2.1rem;
    padding: 0 0.7rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-soft);
    color: var(--muted-strong);
    font-size: 0.84rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.glossary-alphabet__link:hover {
    color: var(--accent);
    border-color: rgba(15, 143, 128, 0.24);
    background: var(--surface-tint);
}

.glossary-letter-group {
    scroll-margin-top: 6rem;
}

.glossary-letter-group__title {
    margin: 0 0 0.9rem;
    color: var(--text-strong);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.glossary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem 1rem;
}

.doc-page--glossary .glossary-entry {
    margin: 0;
    padding: 0.85rem 0 0 0;
    border: 0;
    border-top: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
}

.doc-page--glossary .glossary-grid .glossary-entry:first-child,
.doc-page--glossary .glossary-grid .glossary-entry:nth-child(2) {
    border-top: 0;
    padding-top: 0;
}

.doc-page--glossary .glossary-entry__term {
    margin: 0 0 0.3rem;
    font-size: 0.97rem;
    line-height: 1.35;
}

.doc-page--glossary .glossary-entry__definition {
    color: var(--muted-strong);
    font-size: 0.9rem;
    line-height: 1.55;
}

.doc-page__content table {
    width: 100%;
    margin: 1.4rem 0;
    border-collapse: collapse;
    border: 1px solid var(--line);
    border-radius: 16px;
    overflow: hidden;
    background: var(--surface-soft);
}

.doc-page__content th,
.doc-page__content td {
    padding: 0.85rem 0.95rem;
    border-top: 1px solid var(--line);
    vertical-align: top;
}

.doc-page__content th {
    color: var(--text-strong);
    text-align: left;
}

.doc-page__content font {
    color: inherit;
}

.doc-page__footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2.2rem;
    padding-top: 1.4rem;
    border-top: 1px solid var(--line);
}

.page-jump {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 210px;
    padding: 0.95rem 1rem;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-soft);
}

.page-jump small {
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.page-jump strong {
    color: var(--text-strong);
    font-size: 0.98rem;
}

.page-jump--next {
    margin-left: auto;
    text-align: right;
}

.doc-page__actions {
    margin-top: 1.4rem;
}

.action-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 176px;
    padding: 0.9rem 1.1rem;
    border-radius: 999px;
    font-weight: 700;
}

.action-button--primary {
    background: var(--accent);
    color: #081512;
}

@media (max-width: 1080px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        z-index: 40;
        width: min(90vw, 340px);
        height: 100vh;
        padding: 0.75rem;
        transform: translateX(calc(-100% - 0.75rem));
        transition: transform 0.22s ease;
    }

    body.sidebar-open .sidebar {
        transform: translateX(0);
    }

    .layout-overlay {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 35;
        border: 0;
        padding: 0;
        background: rgba(3, 10, 14, 0.38);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.22s ease;
    }

    body.sidebar-open .layout-overlay {
        opacity: 1;
        pointer-events: auto;
    }

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

    .topbar__menu-toggle {
        display: inline-flex;
        flex: 0 0 auto;
        visibility: visible;
        opacity: 1;
    }

    .topbar__brand-copy {
        display: none;
    }
}

@media (max-width: 720px) {
    .layout {
        width: calc(100% - 1rem);
        margin: 0.5rem auto;
    }

    .topbar,
    .doc-page,
    .sidebar__inner {
        border-radius: 20px;
    }

    .topbar {
        gap: 0.8rem;
        padding: 0.7rem 0.8rem;
    }

    .topbar__brand {
        display: none;
    }

    .topbar__menu-toggle {
        width: 44px;
        height: 44px;
    }

    .topbar__context {
        min-width: 0;
    }

    .topbar__title {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .theme-toggle__label {
        display: none;
    }

    .doc-page {
        padding: 1.2rem;
    }

    .doc-page__header h1,
    .doc-page--empty h1 {
        font-size: 1.9rem;
    }

    .doc-page__content p,
    .doc-page__content li,
    .doc-page__content td {
        font-size: 0.98rem;
    }

    .article-figure {
        padding: 0.8rem;
    }

    .article-figure__media {
        min-height: 170px;
        padding: 0.7rem;
    }

    .doc-page__footer {
        flex-direction: column;
    }

    .page-jump,
    .page-jump--next {
        margin-left: 0;
        text-align: left;
    }

    .glossary-grid {
        grid-template-columns: 1fr;
    }

    .doc-page--glossary .glossary-grid .glossary-entry:nth-child(2) {
        border-top: 1px solid var(--line);
        padding-top: 0.85rem;
    }
}

@media (min-width: 1280px) {
    .glossary-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .doc-page--glossary .glossary-grid .glossary-entry:nth-child(3) {
        border-top: 0;
        padding-top: 0;
    }
}