* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: #24292f;
    background-color: #fff;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #0d1117;
        color: #c9d1d9;
    }
}

a {
    color: #0969da;
    text-decoration: none;
}

@media (prefers-color-scheme: dark) {
    a { color: #58a6ff; }
}

a:hover { text-decoration: underline; }

code {
    background-color: #f6f8fa;
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.9em;
}

@media (prefers-color-scheme: dark) {
    code { background-color: #161b22; }
}

/* ── Layout: fixed left nav + content column ── */

.layout {
    display: flex;
    max-width: 1100px;
    margin: 0 auto;
}

.sidenav {
    width: 220px;
    flex-shrink: 0;
    padding: 24px 16px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    border-right: 1px solid #e1e4e8;
}

@media (prefers-color-scheme: dark) {
    .sidenav { border-right-color: #30363d; }
}

.sidenav .title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 1.25rem;
    display: block;
    color: #24292f;
}

@media (prefers-color-scheme: dark) {
    .sidenav .title { color: #c9d1d9; }
}

.sidenav h5 {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #6e7781;
    margin: 1.25rem 0 0.4rem;
}

.sidenav h5:first-of-type { margin-top: 0; }

@media (prefers-color-scheme: dark) {
    .sidenav h5 { color: #8b949e; }
}

.sidenav ul {
    list-style: none;
}

.sidenav li a {
    display: block;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    color: #57606a;
    font-size: 0.9rem;
}

@media (prefers-color-scheme: dark) {
    .sidenav li a { color: #8b949e; }
}

.sidenav li a:hover {
    background-color: #f6f8fa;
    text-decoration: none;
}

@media (prefers-color-scheme: dark) {
    .sidenav li a:hover { background-color: #161b22; }
}

.sidenav li a.active {
    background-color: #ddf4ff;
    color: #0969da;
    font-weight: 600;
}

@media (prefers-color-scheme: dark) {
    .sidenav li a.active {
        background-color: #0d2a47;
        color: #58a6ff;
    }
}

.content {
    flex: 1;
    min-width: 0;
    padding: 32px 40px 80px;
}

/* ── Typography ── */

h1 {
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #e1e4e8;
}

@media (prefers-color-scheme: dark) {
    h1 { border-bottom-color: #30363d; }
}

h2 {
    font-size: 1.35rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

h3 {
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

h4 {
    font-size: 1rem;
    margin-top: 1rem;
    margin-bottom: 0.4rem;
    font-weight: 600;
}

p { margin-bottom: 0.9rem; }

img {
    max-width: 100%;
    border-radius: 6px;
    border: 1px solid #e1e4e8;
    margin: 0.75rem 0 1.25rem;
    display: block;
}

@media (prefers-color-scheme: dark) {
    img { border-color: #30363d; }
}

.intro {
    color: #57606a;
    margin-bottom: 1.5rem;
}

@media (prefers-color-scheme: dark) {
    .intro { color: #8b949e; }
}

ul, ol {
    margin-left: 1.4rem;
    margin-bottom: 0.9rem;
}

li { margin-bottom: 0.3rem; }

section { margin-bottom: 2rem; }

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
}

th, td {
    border: 1px solid #e1e4e8;
    padding: 0.5rem 0.75rem;
    text-align: left;
}

@media (prefers-color-scheme: dark) {
    th, td { border-color: #30363d; }
}

thead { background-color: #f6f8fa; }

@media (prefers-color-scheme: dark) {
    thead { background-color: #161b22; }
}

/* ── Notes ── */

.note {
    padding: 0.75rem 1rem;
    border-left: 3px solid #d0d7de;
    background-color: #f6f8fa;
    margin: 1rem 0;
    font-size: 0.92rem;
}

@media (prefers-color-scheme: dark) {
    .note {
        background-color: #161b22;
        border-left-color: #30363d;
    }
}

.note.warn { border-left-color: #d29922; }
.note.done { border-left-color: #1a7f37; }

/* ── FAQ ── */

.qa { margin-bottom: 1.25rem; }
.qa h3 { margin-top: 0; margin-bottom: 0.3rem; font-size: 1rem; }
.qa p { margin-bottom: 0.4rem; }

/* ── Index page ── */

.index-lead { font-size: 1rem; color: #57606a; margin-bottom: 2rem; }

@media (prefers-color-scheme: dark) {
    .index-lead { color: #8b949e; }
}

.toc-list { list-style: none; margin-left: 0; }
.toc-list li { margin-bottom: 0.5rem; }
.toc-list .desc { color: #6e7781; font-size: 0.88rem; }

@media (prefers-color-scheme: dark) {
    .toc-list .desc { color: #8b949e; }
}

/* ── Upcoming-features preview ── */

.upcoming {
    margin-top: 2.5rem;
    padding: 1.25rem 1.5rem;
    border: 1px dashed #d29922;
    border-radius: 8px;
    background-color: #fffbeb;
}

@media (prefers-color-scheme: dark) {
    .upcoming {
        background-color: #2a2410;
        border-color: #9e6a03;
    }
}

.upcoming h2 {
    margin-top: 0;
}

.badge-soon {
    display: inline-block;
    vertical-align: middle;
    margin-left: 0.5rem;
    padding: 0.15rem 0.6rem;
    border-radius: 20px;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    background-color: #d29922;
    color: #fff;
}

@media (prefers-color-scheme: dark) {
    .badge-soon {
        background-color: #9e6a03;
    }
}

/* ── Responsive ── */

@media (max-width: 800px) {
    .layout { flex-direction: column; }
    .sidenav {
        width: 100%;
        height: auto;
        position: static;
        border-right: none;
        border-bottom: 1px solid #e1e4e8;
    }
    .content { padding: 24px 20px; }
}