:root {
    --bg: #f5f8fb;
    --surface: #ffffff;
    --panel: #f1f5fa;
    --border: #d7e0ea;
    --text: #102338;
    --muted: #51657b;
    --primary: #0f6ba8;
    --primary-2: #0d4e7b;
    --success: #157f4a;
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow: 0 14px 34px rgba(13, 38, 62, 0.11);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Manrope', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    color: var(--text);
    background: radial-gradient(circle at top right, #e6f3ff 0%, #f5f8fb 40%, #edf3f9 100%);
    line-height: 1.6;
}

.docs-header {
    background: linear-gradient(130deg, #0f3049, #0f4a71);
    color: #f4fbff;
    padding: 34px 22px;
}

.docs-header__inner {
    max-width: 1320px;
    margin: 0 auto;
    display: flex;
    gap: 28px;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
}

.docs-kicker {
    margin: 0 0 6px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 12px;
    opacity: 0.9;
    font-weight: 800;
}

.docs-header h1 {
    margin: 0;
    font-size: clamp(1.9rem, 3vw, 2.5rem);
    line-height: 1.2;
}

.docs-lead {
    margin: 12px 0 0;
    max-width: 760px;
    color: #d7e7f4;
}

.docs-header__actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    min-height: 42px;
    padding: 10px 16px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.2s ease;
}

.btn--soft {
    background: #f0f7ff;
    color: #0c3f66;
    border-color: #c4dbef;
}

.btn--soft:hover {
    background: #e4f2ff;
}

.btn--ghost {
    background: transparent;
    color: inherit;
    border-color: rgba(255, 255, 255, 0.4);
}

.btn--ghost:hover {
    border-color: rgba(255, 255, 255, 0.8);
}

.docs-main {
    max-width: 1320px;
    margin: 22px auto 34px;
    padding: 0 18px;
    display: grid;
    gap: 18px;
}

.docs-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.metric {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    box-shadow: var(--shadow);
}

.metric__label {
    display: block;
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 700;
}

.metric__value {
    display: block;
    margin-top: 4px;
    font-size: 1.2rem;
    font-weight: 800;
}

.docs-layout {
    display: grid;
    grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
    gap: 14px;
}

.docs-sidebar,
.docs-viewer {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.docs-sidebar {
    display: grid;
    grid-template-rows: auto minmax(380px, 1fr);
    overflow: hidden;
}

.docs-controls {
    border-bottom: 1px solid var(--border);
    padding: 14px;
    display: grid;
    gap: 12px;
    background: var(--panel);
}

.lang-switch {
    display: flex;
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
    width: fit-content;
}

.lang-switch__btn {
    border: 0;
    background: transparent;
    padding: 8px 14px;
    font-weight: 700;
    color: var(--muted);
    cursor: pointer;
}

.lang-switch__btn.is-active {
    background: var(--primary);
    color: #fff;
}

.search-box {
    display: grid;
    gap: 6px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.search-box input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: 14px;
    color: var(--text);
    background: #fff;
}

.search-box input:focus {
    outline: 2px solid rgba(15, 107, 168, 0.25);
    border-color: #86b7db;
}

.doc-nav {
    padding: 10px;
    overflow: auto;
}

.doc-nav__group {
    margin-bottom: 14px;
}

.doc-nav__title {
    margin: 0 0 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.doc-nav__item {
    width: 100%;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    text-align: left;
    padding: 10px;
    cursor: pointer;
    display: grid;
    gap: 4px;
    color: var(--text);
}

.doc-nav__item:hover {
    background: #f4f9ff;
    border-color: #d8e7f4;
}

.doc-nav__item.is-active {
    background: #eaf4ff;
    border-color: #95bee2;
}

.doc-nav__name {
    font-weight: 700;
    font-size: 14px;
}

.doc-nav__meta {
    font-size: 12px;
    color: var(--muted);
}

.docs-viewer {
    min-height: 600px;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
}

.docs-viewer__header {
    border-bottom: 1px solid var(--border);
    padding: 16px 18px;
    display: flex;
    gap: 12px;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
}

.doc-group {
    margin: 0;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.05em;
    color: var(--muted);
    font-weight: 800;
}

.docs-viewer h2 {
    margin: 4px 0 0;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    line-height: 1.3;
}

.docs-viewer__actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.doc-content {
    overflow: auto;
    padding: 20px;
}

.prose {
    color: #17283a;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
    line-height: 1.25;
    margin-top: 1.4em;
    margin-bottom: 0.4em;
}

.prose h1 {
    font-size: 1.7rem;
}

.prose h2 {
    font-size: 1.35rem;
}

.prose h3 {
    font-size: 1.15rem;
}

.prose p,
.prose ul,
.prose ol,
.prose table,
.prose pre,
.prose blockquote {
    margin: 0 0 1em;
}

.prose a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.prose ul,
.prose ol {
    padding-left: 1.2rem;
}

.prose code {
    background: #edf3f9;
    border: 1px solid #d4dfeb;
    border-radius: 5px;
    padding: 2px 5px;
    font-size: 0.9em;
}

.prose pre {
    background: #0c2232;
    color: #e8f3fc;
    padding: 12px;
    border-radius: 10px;
    overflow: auto;
}

.prose pre code {
    background: transparent;
    border: 0;
    padding: 0;
    color: inherit;
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.prose table th,
.prose table td {
    border: 1px solid #d8e3ef;
    padding: 8px;
    text-align: left;
    vertical-align: top;
}

.prose table th {
    background: #f2f7fc;
    font-weight: 800;
}

.prose blockquote {
    margin-left: 0;
    border-left: 4px solid #91b6d7;
    padding: 8px 12px;
    background: #f2f7fc;
    color: #2f4a63;
}

.doc-empty,
.doc-error {
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 18px;
    color: var(--muted);
    background: #f9fbfd;
}

.doc-error {
    border-color: #d58b8b;
    color: #842121;
    background: #fff6f6;
}

@media (max-width: 1024px) {
    .docs-layout {
        grid-template-columns: 1fr;
    }

    .docs-sidebar {
        grid-template-rows: auto auto;
        max-height: 420px;
    }

    .doc-nav {
        max-height: 300px;
    }
}