:root {
    --bg: #e8eef1;
    --bg-sidebar: #14303a;
    --bg-content: #ffffff;
    --ink: #1a2a30;
    --ink-muted: #5a6d75;
    --accent: #0c7a68;
    --line: #cfd9de;
    --sidebar-ink: #d5e2e7;
    --sidebar-muted: #8aa0a9;
    --sidebar-active: #6fd0bc;
    --code-bg: #eef3f5;
    --table-head: #eef5f3;
    --shadow: 0 10px 36px rgba(20, 48, 58, 0.1);
    --font-sans: "Manrope", "Segoe UI", sans-serif;
    --font-display: "Fraunces", "Georgia", serif;
    --font-mono: "IBM Plex Mono", "Consolas", monospace;
    --sidebar-w: 300px;
    --content-max: 46rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    background:
        linear-gradient(180deg, #dfe8ec 0%, var(--bg) 28%, #f2f6f8 100%);
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.65;
}

a {
    color: var(--accent);
}

a:hover {
    color: #085f51;
}

.layout {
    display: grid;
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow: auto;
    background:
        linear-gradient(160deg, rgba(111, 208, 188, 0.14), transparent 42%),
        var(--bg-sidebar);
    color: var(--sidebar-ink);
    padding: 1.5rem 1.1rem 2rem;
}

.brand {
    margin-bottom: 1.75rem;
    padding: 0 0.4rem;
}

.brand-link {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    text-decoration: none;
    color: inherit;
}

.brand-name {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: #fff;
}

.brand-sub {
    font-size: 0.82rem;
    color: var(--sidebar-muted);
}

.nav-group + .nav-group {
    margin-top: 1.35rem;
}

.nav-group-title {
    padding: 0 0.55rem 0.45rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--sidebar-muted);
}

.nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    display: block;
    padding: 0.45rem 0.7rem;
    border-radius: 8px;
    color: var(--sidebar-ink);
    text-decoration: none;
    font-size: 0.95rem;
    line-height: 1.35;
    transition: background 0.15s ease, color 0.15s ease;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
}

.nav-link.is-active {
    background: rgba(111, 208, 188, 0.16);
    color: var(--sidebar-active);
    font-weight: 600;
}

.main {
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.9rem 1.5rem 0;
}

.menu-toggle {
    display: none;
    border: 1px solid var(--line);
    background: var(--bg-content);
    color: var(--ink);
    border-radius: 8px;
    width: 2.4rem;
    height: 2.4rem;
    font-size: 1.1rem;
    cursor: pointer;
}

.crumb {
    margin: 0;
    color: var(--ink-muted);
    font-size: 0.85rem;
}

.crumb code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: transparent;
    padding: 0;
}

.content {
    margin: 0.75rem 1.5rem 2.5rem;
    padding: 2rem 2.25rem 2.5rem;
    max-width: calc(var(--content-max) + 4.5rem);
    background: var(--bg-content);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.prose > *:first-child {
    margin-top: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
    font-family: var(--font-display);
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: #10252c;
}

.prose h1 {
    font-size: 2rem;
    margin: 0 0 1rem;
    padding-bottom: 0.7rem;
    border-bottom: 1px solid var(--line);
}

.prose h2 {
    font-size: 1.45rem;
    margin: 2rem 0 0.8rem;
}

.prose h3 {
    font-size: 1.15rem;
    margin: 1.5rem 0 0.55rem;
}

.prose p,
.prose ul,
.prose ol {
    margin: 0.8rem 0;
}

.prose li + li {
    margin-top: 0.25rem;
}

.prose hr {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 1.8rem 0;
}

.prose strong {
    font-weight: 700;
}

.prose code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--code-bg);
    padding: 0.1em 0.35em;
    border-radius: 4px;
}

.prose pre {
    overflow: auto;
    padding: 1rem 1.1rem;
    background: #14303a;
    color: #e7eef2;
    border-radius: 12px;
}

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

.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.1rem 0;
    font-size: 0.95rem;
    display: block;
    overflow-x: auto;
}

.prose th,
.prose td {
    border: 1px solid var(--line);
    padding: 0.55rem 0.7rem;
    text-align: left;
    vertical-align: top;
}

.prose th {
    background: var(--table-head);
    font-weight: 700;
}

.prose tr:nth-child(even) td {
    background: #f7fafb;
}

.prose blockquote {
    margin: 1rem 0;
    padding: 0.2rem 0 0.2rem 1rem;
    border-left: 3px solid var(--accent);
    color: var(--ink-muted);
}

.error {
    color: #8a2f2f;
}

.sidebar-foot {
    margin: 2rem 0.55rem 0;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.85rem;
}

.sidebar-foot a {
    color: var(--sidebar-muted);
    text-decoration: none;
}

.sidebar-foot a:hover {
    color: #fff;
}

.login-page {
    display: grid;
    place-items: center;
    min-height: 100vh;
    padding: 1.5rem;
}

.login-card {
    width: min(100%, 24rem);
    padding: 2rem 1.75rem 1.85rem;
    background: var(--bg-content);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.login-card h1 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.85rem;
    letter-spacing: -0.03em;
}

.login-lead {
    margin: 0.45rem 0 1.35rem;
    color: var(--ink-muted);
    font-size: 0.95rem;
}

.login-form {
    display: grid;
    gap: 0.55rem;
}

.login-form label {
    font-size: 0.85rem;
    font-weight: 600;
}

.login-form input {
    width: 100%;
    padding: 0.7rem 0.8rem;
    border: 1px solid var(--line);
    border-radius: 10px;
    font: inherit;
}

.login-form button {
    margin-top: 0.35rem;
    padding: 0.75rem 1rem;
    border: 0;
    border-radius: 10px;
    background: var(--accent);
    color: #fff;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.login-form button:hover {
    background: #085f51;
}

.backdrop {
    display: none;
}

@media (max-width: 880px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: min(86vw, var(--sidebar-w));
        z-index: 20;
        transform: translateX(-105%);
        transition: transform 0.2s ease;
        box-shadow: var(--shadow);
    }

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

    .menu-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(16, 37, 44, 0.45);
        z-index: 15;
    }

    .backdrop[hidden] {
        display: none;
    }

    .content {
        margin: 0.5rem 0.85rem 1.5rem;
        padding: 1.35rem 1.15rem 1.75rem;
        border-radius: 14px;
    }

    .prose h1 {
        font-size: 1.55rem;
    }

    .topbar {
        padding: 0.75rem 0.85rem 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .sidebar,
    .nav-link {
        transition: none;
    }
}