/* Trang cong khai (SEO) - khong can JavaScript */
:root { --ink: #1A2035; --ink-2: #464F6E; --muted: #747C98; --line: #DFE3EE; --paper: #F5F6FA; --card: #fff; --tim: #5B3FD6; --tim-soft: #EEEAFD; --la: #138A5A; --do: #D3263A; --code: #1B2034; --code-ink: #E6E9F5; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --ink: #E8F0EB; --ink-2: #B4C3BC; --muted: #82958D; --line: #2A3E39; --paper: #14211E; --card: #1A2B27; --tim: #A895F0; --tim-soft: rgba(168,149,240,.15); } }
* { box-sizing: border-box; }
body { margin: 0; font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--paper); line-height: 1.65; font-size: 16px; }
a { color: var(--tim); }
.pub-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 20px; border-bottom: 1px solid var(--line); background: var(--card); position: sticky; top: 0; flex-wrap: wrap; }
.pub-brand { display: flex; gap: 8px; align-items: center; font-weight: 800; color: var(--ink); text-decoration: none; }
.pub-brand .mark { background: var(--tim); color: #fff; border-radius: 8px; padding: 2px 7px; font-size: 14px; }
.pub-top nav { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.pub-top nav a { text-decoration: none; font-weight: 600; }
.btn { display: inline-block; padding: 9px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); text-decoration: none; font-weight: 600; }
.btn-primary { background: var(--tim); border-color: var(--tim); color: #fff; }
.pub-main { max-width: 860px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: clamp(26px, 5vw, 34px); line-height: 1.25; margin: 6px 0 10px; }
h2 { font-size: 21px; margin: 28px 0 10px; }
.lead { font-size: 18px; color: var(--ink-2); }
.muted { color: var(--muted); }
.kicker { color: var(--tim); font-weight: 700; font-size: 14px; margin: 0; }
.crumbs { font-size: 14px; color: var(--muted); }
pre { background: var(--code); color: var(--code-ink); padding: 12px 16px; border-radius: 10px; overflow-x: auto; font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 14px; }
pre.good { border-left: 4px solid var(--la); }
.mistake { border-bottom: 1px solid var(--line); padding: 8px 0; }
.mistake pre:first-child { border-left: 4px solid var(--do); }
.cta { margin: 28px 0; padding: 18px; border-radius: 14px; background: var(--tim-soft); }
.cta p { margin: 6px 0 12px; }
.pub-list li { margin-bottom: 12px; }
.pro { background: #F5B300; color: #2A1700; font-size: 12px; font-weight: 800; padding: 1px 7px; border-radius: 6px; }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; margin: 18px 0; }
.plan { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.plan h2 { margin: 0; font-size: 18px; }
.plan .price { font-size: 26px; font-weight: 800; margin: 6px 0; }
.plan ul { padding-left: 18px; font-size: 14.5px; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 30px; padding-top: 16px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.legal h2 { font-size: 18px; }
.pub-foot { border-top: 1px solid var(--line); padding: 20px 16px 32px; text-align: center; font-size: 14px; }
.pub-foot nav { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin: 8px 0; }