/* PAuto — trang giới thiệu (không có bảng giá, không có thanh toán). Không dùng font/thư viện ngoài. */
:root {
  --blue-900: #0b2a6b; --blue-700: #1349b8; --blue-600: #1d5fe0; --blue-500: #2f74ff; --blue-100: #e6efff; --blue-50: #f3f7ff;
  --ink: #0f1b33; --ink-2: #3b4a66; --muted: #66758f; --line: #e3e9f4; --bg: #ffffff; --bg-soft: #f6f9ff;
  --ok: #15803d; --bad: #b91c1c; --ok-bg: #e9f8ee; --bad-bg: #fdecec;
  --dark: #1c2638; --dark-2: #2b3a55; --on-dark: #e8eefb; --on-dark-2: #b7c3da;
  --radius: 18px; --radius-sm: 12px; --shadow: 0 10px 30px rgba(18, 52, 120, .08);
  --wrap: 1120px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  color: var(--ink); background: var(--bg); -webkit-text-size-adjust: 100%;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 76px; }
body { margin: 0; line-height: 1.6; overflow-x: hidden; background: var(--bg); }
img { max-width: 100%; display: block; }
a { color: var(--blue-600); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); }
h2 { font-size: clamp(1.55rem, 3.4vw, 2.2rem); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.center { text-align: center; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: #fff; padding: 8px 12px; z-index: 100; }

/* header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; gap: 12px; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.25rem; color: var(--ink); }
.logo:hover { text-decoration: none; }
.logo img { width: 38px; height: 38px; border-radius: 10px; }
.menu { display: flex; gap: 2px; margin-left: auto; align-items: center; }
.menu a { color: var(--ink-2); font-weight: 600; font-size: .95rem; padding: 8px 11px; border-radius: 10px; }
.menu a:hover, .menu a[aria-current="page"] { color: var(--blue-700); background: var(--blue-50); text-decoration: none; }
.menu-toggle { display: none; margin-left: auto; background: none; border: 0; width: 44px; height: 44px; border-radius: 12px; cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px auto; border-radius: 2px; }
@media (max-width: 920px) {
  .menu-toggle { display: block; }
  .menu { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch; background: #fff; padding: 8px 16px 16px; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .menu.open { display: flex; }
  .menu a { padding: 13px 12px; font-size: 1rem; }
}

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 20px; border-radius: 12px; border: 1px solid transparent; font: inherit; font-weight: 700; cursor: pointer; text-decoration: none !important; }
.btn-primary { background: linear-gradient(135deg, var(--blue-500), var(--blue-700)); color: #fff; box-shadow: 0 8px 18px rgba(29,95,224,.25); }
.btn-ghost { background: #fff; color: var(--blue-700); border-color: #cfdcf5; }
.btn-dark { background: #0f1b33; color: #fff; }
.btn small { display: block; font-weight: 500; font-size: .72rem; opacity: .85; line-height: 1.1; }
.btn .two { text-align: left; line-height: 1.2; }
.btn[aria-disabled="true"] { opacity: .6; cursor: default; }
.btns { display: flex; flex-wrap: wrap; gap: 12px; }

/* sections */
section { padding: 64px 0; }
.soft { background: var(--bg-soft); }
.eyebrow { display: inline-block; font-weight: 700; font-size: .85rem; color: var(--blue-700); background: var(--blue-100); padding: 4px 12px; border-radius: 999px; margin-bottom: 12px; }
.lead { font-size: 1.12rem; color: var(--ink-2); }
.head { max-width: 720px; margin: 0 auto 36px; text-align: center; }

/* hero */
.hero { padding: 56px 0 64px; background: radial-gradient(1200px 500px at 85% -10%, var(--blue-100), transparent 60%), linear-gradient(180deg, #fff, var(--bg-soft)); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.hero h1 span { color: var(--blue-600); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 26px; padding: 0; list-style: none; }
.chips li { background: #fff; border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; font-weight: 600; font-size: .9rem; color: var(--ink-2); }
.phone { max-width: 300px; margin: 0 auto; border-radius: 34px; padding: 10px; background: #0f1b33; box-shadow: 0 30px 60px rgba(15,27,51,.25); }
.phone img { border-radius: 26px; width: 100%; height: auto; }
.note-small { font-size: .82rem; color: var(--muted); margin-top: 10px; text-align: center; }
@media (max-width: 820px) { .hero-grid { grid-template-columns: 1fr; } .phone { max-width: 240px; } }

/* cards */
.grid { display: grid; gap: 16px; }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .g3, .g4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.card p { margin: 0; color: var(--ink-2); }
.ico { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; font-size: 1.35rem; background: var(--blue-50); margin-bottom: 12px; }
.steps { counter-reset: s; }
.steps .card { position: relative; padding-top: 52px; }
.steps .card::before { counter-increment: s; content: counter(s); position: absolute; top: 16px; left: 22px; width: 28px; height: 28px; border-radius: 50%; background: var(--blue-600); color: #fff; font-weight: 800; display: grid; place-items: center; font-size: .9rem; }

/* compare table */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 520px; }
th, td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--blue-50); font-size: .92rem; }
tr:last-child td { border-bottom: 0; }

/* faq */
.faq { max-width: 820px; margin: 0 auto; }
details { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 10px; }
summary { cursor: pointer; padding: 16px 18px; font-weight: 700; list-style: none; position: relative; padding-right: 44px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 18px; top: 13px; font-size: 1.3rem; color: var(--blue-600); }
details[open] summary::after { content: "–"; }
details > div { padding: 0 18px 16px; color: var(--ink-2); }

/* cta */
.cta { background: linear-gradient(135deg, var(--blue-600), var(--blue-900)); color: #fff; border-radius: 24px; padding: 40px 28px; text-align: center; }
.cta p { color: #dbe6ff; }
.cta .btns { justify-content: center; }

/* legal pages */
.doc { max-width: 820px; margin: 0 auto; padding: 40px 16px 64px; }
.doc h2 { font-size: 1.3rem; margin-top: 1.6em; }
.doc li { margin-bottom: .4em; }
.doc .updated { color: var(--muted); }
.callout { background: var(--blue-50); border: 1px solid #cfdcf5; border-radius: var(--radius-sm); padding: 14px 16px; margin: 16px 0; }

/* contact */
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.contact-list li { display: flex; gap: 12px; align-items: center; }
.contact-list .ico { margin: 0; flex: none; }
[data-contact-missing] { color: var(--muted); font-style: italic; }

/* keyword tester */
.tester { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 820px) { .tester { grid-template-columns: 1fr; } }
label { font-weight: 700; display: block; margin-bottom: 6px; }
.hint { font-weight: 400; color: var(--muted); font-size: .88rem; }
textarea, input[type=text], input[type=number], select { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid #cfd8ea; border-radius: 10px; background: #fff; color: var(--ink); }
textarea { min-height: 110px; resize: vertical; }
.field { margin-bottom: 14px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 120px; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 600; }
.check input { width: 18px; height: 18px; }
.result { border-radius: var(--radius-sm); padding: 14px 16px; margin-top: 8px; border: 1px solid var(--line); }
.result.pass { background: var(--ok-bg); border-color: #b7e4c7; color: var(--ok); }
.result.fail { background: var(--bad-bg); border-color: #f5c2c2; color: var(--bad); }
.result ul { margin: 6px 0 0; padding-left: 20px; }
.samples { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.samples button { font: inherit; font-size: .85rem; border: 1px solid #cfdcf5; background: #fff; color: var(--blue-700); border-radius: 999px; padding: 4px 12px; cursor: pointer; }
mark { background: #fff3a8; padding: 0 2px; border-radius: 3px; }
.preview { white-space: pre-wrap; background: var(--bg-soft); border: 1px dashed #cfd8ea; border-radius: 10px; padding: 10px 12px; margin-top: 10px; min-height: 44px; }

/* footer */
.site-footer { background: linear-gradient(160deg, var(--dark), var(--dark-2)); color: var(--on-dark); padding: 48px 0 28px; }
.site-footer a { color: var(--on-dark-2); }
.site-footer a:hover { color: #fff; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
@media (max-width: 820px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .foot-grid { grid-template-columns: 1fr; text-align: center; } .site-footer .logo { justify-content: center; } }
.site-footer h4 { margin: 0 0 12px; color: #fff; font-size: 1rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.site-footer .logo { color: #fff; margin-bottom: 10px; }
.disclaimer { border-top: 1px solid rgba(255,255,255,.14); margin-top: 32px; padding-top: 20px; font-size: .88rem; color: var(--on-dark-2); text-align: center; }
.disclaimer strong { color: #fff; }