/* =========================
   Base layout & typography
   ========================= */

:root {
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-light: #e5e7eb;
    --bg-code: #0f172a;
    --bg-inline-code: #f1f5f9;
    --bg-toc: #f8fafc;
    --link-main: #2563eb;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
    color: var(--text-main);
    background-color: #ffffff;
}

/* =========================
   Headings & anchors
   ========================= */

h1, h2, h3, h4 {
    margin-top: 2.5rem;
    font-weight: 600;
    scroll-margin-top: 80px;
}

h1 {
    font-size: 2.2rem;
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 0.4rem;
}

h2 {
    font-size: 1.6rem;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 0.25rem;
}

h3 {
    font-size: 1.25rem;
}

.headerlink {
    visibility: hidden;
    margin-left: 8px;
    font-size: 0.85em;
    color: var(--text-muted);
}

h2:hover .headerlink,
h3:hover .headerlink,
h4:hover .headerlink {
    visibility: visible;
}

/* =========================
   Links
   ========================= */

a {
    color: var(--link-main);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* =========================
   Paragraphs & lists
   ========================= */

p {
    margin: 1rem 0;
}

ul, ol {
    margin: 1rem 0 1rem 1.5rem;
}

li {
    margin: 0.3rem 0;
}

/* =========================
   Code blocks & inline code
   ========================= */

pre {
    background-color: var(--bg-code);
    color: #e5e7eb;
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

code {
    background-color: var(--bg-inline-code);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.95em;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
        "Liberation Mono", "Courier New", monospace;
}

pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* =========================
   Tables
   ========================= */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

thead {
    background-color: #f9fafb;
}

th, td {
    border: 1px solid var(--border-light);
    padding: 10px 12px;
    text-align: left;
}

th {
    font-weight: 600;
}

/* =========================
   Blockquotes
   ========================= */

blockquote {
    margin: 1.5rem 0;
    padding: 12px 16px;
    border-left: 4px solid var(--link-main);
    background-color: #f8fafc;
    color: var(--text-muted);
}

/* =========================
   Table of Contents (markdown toc)
   ========================= */

.toc {
    background-color: var(--bg-toc);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 2.5rem;
}

.toc > ul {
    list-style: none;
    padding-left: 0;
}

.toc ul ul {
    padding-left: 1rem;
}

.toc li {
    margin: 6px 0;
}

.toc a {
    font-size: 0.95rem;
    color: var(--link-main);
}

/* =========================
   Horizontal rule
   ========================= */

hr {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 3rem 0;
}

/* =========================
   Responsive tweaks
   ========================= */

@media (max-width: 640px) {
    body {
        margin: 20px auto;
        padding: 0 14px;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.4rem;
    }
}

/* =========================
   Entry list
   ========================= */

.entry-list {
    margin-top: 2rem;
    padding-left: 1.5rem;
}

.entry-list li {
    margin: 0.8rem 0;
    font-size: 1.05rem;
}

.entry-list a {
    font-weight: 500;
}