/* JetCharterCost: navy đêm + vàng champagne + nền ngà, Playfair Display + Inter. Mọi màu là biến, có sáng/tối.
   Xem design-system/jet-charter/MASTER.md (mục CHỐT CUỐI). Tương phản đã kiểm tra ≥4,5:1. */
:root {
  --bg: #f8f6f1; --surface: #ffffff; --sunk: #efebe2; --fg: #16202e; --muted: #5a6472; --line: #e1dbcf;
  --navy: #0f1b2d; --on-navy: #e8e3d8; --navy-muted: #b7c0cc;
  --gold: #c9a45c; --on-gold: #0f1b2d; --link: #8a6516; --accent-soft: #f4ecdc;
  --warn-soft: #fbf0dc; --radius: 12px;
  --serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: #0d1520; --surface: #131e2c; --sunk: #182536; --fg: #e8e3d8; --muted: #a8b0bb; --line: #243347; --navy: #08101a; --link: #d9bf86; --accent-soft: #1d2a3b; --warn-soft: #2e230f; color-scheme: dark; }
}
:root[data-theme="dark"] { --bg: #0d1520; --surface: #131e2c; --sunk: #182536; --fg: #e8e3d8; --muted: #a8b0bb; --line: #243347; --navy: #08101a; --link: #d9bf86; --accent-soft: #1d2a3b; --warn-soft: #2e230f; color-scheme: dark; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16.5px/1.7 var(--sans); }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; border-radius: 4px; }
code { font-size: 0.88em; background: var(--sunk); padding: 1px 5px; border-radius: 5px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.18; color: var(--fg); letter-spacing: -0.01em; }
h1 { font-size: clamp(32px, 4.8vw, 50px); margin: 8px 0 14px; }
h2 { font-size: clamp(25px, 3.2vw, 32px); margin: 48px 0 12px; }
h3 { font-size: 21px; margin: 28px 0 8px; }
h2[id], h3[id] { scroll-margin-top: 84px; }

/* đầu trang: dải navy */
.hd { background: var(--navy); color: var(--on-navy); position: sticky; top: 0; z-index: 5; border-bottom: 1px solid rgba(201,164,92,.25); }
.hd-in { display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--on-navy); text-decoration: none; font-family: var(--serif); font-weight: 600; font-size: 21px; white-space: nowrap; }
.brand svg { width: 30px; height: 30px; flex: none; }
.brand .l1 { fill: none; stroke: #c9a45c; stroke-width: 1.5; } .brand .l2 { fill: #c9a45c; }
.hd nav { display: flex; align-items: center; gap: 2px; }
.hd nav a { color: var(--navy-muted); text-decoration: none; font-weight: 500; font-size: 14px; padding: 12px 10px; border-radius: 8px; white-space: nowrap; }
.hd nav a:hover, .hd nav a[aria-current] { color: #fff; background: rgba(255,255,255,.07); }
.theme { width: 44px; height: 44px; border: 0; background: none; color: var(--navy-muted); border-radius: 8px; cursor: pointer; display: grid; place-items: center; }
.theme:hover { background: rgba(255,255,255,.07); color: #fff; }
.theme svg { width: 20px; height: 20px; fill: currentColor; }
@media (max-width: 680px) { .hd nav a:not(:first-child) { display: none; } }
@media (max-width: 420px) { .hd nav a { display: none; } .brand { font-size: 19px; } }

/* hero trang chủ */
.hero { background: var(--navy); color: var(--on-navy); position: relative; overflow: hidden; }
.hero .wrap { position: relative; padding-top: 64px; padding-bottom: 56px; }
.hero h1 { color: #fff; max-width: 780px; font-size: clamp(36px, 5.6vw, 58px); }
.hero .lead { color: var(--navy-muted); }
.hero .route { position: absolute; right: -40px; top: 10px; width: 520px; max-width: 70%; opacity: .5; pointer-events: none; }
.hero .route path { fill: none; stroke: #c9a45c; stroke-width: 1.2; stroke-dasharray: 4 7; }
.hero .route circle { fill: #c9a45c; }
.kicker { text-transform: uppercase; letter-spacing: 0.16em; font-size: 12px; font-weight: 600; color: var(--gold); margin: 0; }
.page-head .kicker, .prose .kicker { color: var(--link); }
.lead { font-size: 18.5px; color: var(--muted); max-width: 680px; margin: 0 0 26px; }
.trust { list-style: none; padding: 0; margin: 30px 0 0; display: flex; flex-wrap: wrap; gap: 10px 28px; font-size: 14px; color: var(--navy-muted); }
.trust li::before { content: ''; display: inline-block; width: 18px; height: 1px; background: var(--gold); vertical-align: middle; margin-right: 10px; }

/* bảng giá nhanh trên trang chủ */
.snapshot { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: -28px 0 8px; position: relative; }
.snap { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: 0 8px 24px rgba(15,27,45,.08); }
.snap span { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); font-weight: 600; }
.snap strong { display: block; font-family: var(--sans); font-variant-numeric: tabular-nums lining-nums; font-weight: 700; font-size: 19px; letter-spacing: -0.01em; white-space: nowrap; margin: 6px 0 2px; }
.snap em { font-style: normal; font-size: 13px; color: var(--muted); }
.section { padding: 8px 0 24px; }

/* nút */
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 0; }
.btn { display: inline-flex; align-items: center; gap: 8px; min-height: 48px; padding: 12px 22px; border-radius: 999px; border: 1px solid var(--line); color: var(--fg); background: var(--surface); text-decoration: none; font-weight: 600; font-size: 15px; transition: transform .2s ease, background-color .2s ease, border-color .2s ease; cursor: pointer; }
.btn:hover { border-color: var(--gold); }
.btn.primary { background: var(--gold); color: var(--on-gold); border-color: var(--gold); }
.btn.primary:hover { transform: translateY(-1px); }
.hero .btn:not(.primary) { background: transparent; color: #fff; border-color: rgba(255,255,255,.3); }

/* thẻ bài */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.card { display: flex; flex-direction: column; gap: 8px; padding: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--fg); transition: border-color .2s ease, transform .2s ease; }
.card:hover { border-color: var(--gold); transform: translateY(-2px); }
.card strong { font-family: var(--serif); font-size: 22px; font-weight: 600; line-height: 1.2; }
.card span:last-child { color: var(--muted); font-size: 15px; }
.tag { align-self: flex-start; font-size: 11.5px; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 600; color: var(--link); }

/* bài viết */
.crumb { font-size: 14px; color: var(--muted); padding-top: 22px; }
.crumb a { color: var(--muted); }
.prose { max-width: 760px; padding-bottom: 32px; }
.prose p, .prose li { max-width: 72ch; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.disclosure { background: var(--sunk); border-left: 3px solid var(--gold); padding: 12px 16px; font-size: 14px; border-radius: 0 8px 8px 0; }
.disclaimer, .small { color: var(--muted); font-size: 14px; }
.toc { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin: 22px 0 8px; background: var(--surface); }
.toc summary { font-weight: 600; cursor: pointer; }
.toc ol { margin: 10px 0 0; font-size: 15px; }
.callout { background: var(--accent-soft); border-radius: var(--radius); padding: 16px 20px; margin: 20px 0; }
.callout.warn { background: var(--warn-soft); }
.tbl { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--navy); color: var(--on-navy); font-weight: 600; font-size: 13px; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--sunk) 45%, transparent); }
.prose .tbl table { min-width: 560px; }
.sources { font-size: 14px; }
.author { border-top: 1px solid var(--line); margin-top: 32px; padding-top: 18px; font-size: 15px; color: var(--muted); }
.author strong { color: var(--fg); }
.related { padding: 8px 0 40px; }
.page-head { padding: 24px 0 8px; }

/* khung lấy báo giá (affiliate) */
.cta-box { background: var(--navy); color: var(--on-navy); border-radius: 14px; padding: 26px 26px 22px; margin: 30px 0; display: grid; gap: 14px; border: 1px solid rgba(201,164,92,.35); }
.cta-box strong { font-family: var(--serif); font-size: 26px; font-weight: 600; line-height: 1.2; color: #fff; }
.cta-box p { margin: 6px 0 0; color: var(--navy-muted); max-width: 64ch; }
.cta-box .note { font-size: 12.5px; color: var(--navy-muted); flex-basis: 100%; }

/* chân trang */
.ft { background: var(--navy); color: var(--navy-muted); margin-top: 48px; padding: 36px 0 48px; font-size: 14px; }
.ft-in { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.ft strong { font-family: var(--serif); font-size: 20px; color: #fff; }
.ft a { color: var(--on-navy); }
@media (max-width: 760px) { .ft-in { grid-template-columns: 1fr; } .hero .wrap { padding-top: 44px; } .hero .route { display: none; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }