/* VietTest — shared content pages (blog/docs/tools/pricing/about) */
:root {
  --ink: #172037;
  --muted: #596579;
  --line: #e9ecf3;
  --paper: #ffffff;
  --canvas: #f8f9fc;
  --violet: #6954d9;
  --violet-dark: #5340bf;
  --violet-soft: #f0edff;
  --green: #219c74;
  --green-soft: #e8f7f1;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Manrope", "DM Sans", system-ui, -apple-system, sans-serif; background: var(--canvas); color: var(--ink); font-size: 15px; line-height: 1.65; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: 780px; }

.content-header { border-bottom: 1px solid var(--line); background: var(--paper); position: sticky; top: 0; z-index: 20; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 20px; gap: 16px; max-width: 1080px; margin: 0 auto; }
.brand { display: flex; align-items: baseline; gap: 2px; font-weight: 800; text-decoration: none; color: var(--ink); font-size: 20px; }
.brand .mark { color: var(--violet); }
.header-nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.header-nav a { color: var(--muted); text-decoration: none; font-size: 13px; font-weight: 600; }
.header-nav a:hover { color: var(--violet); }
.header-cta { background: var(--violet); color: #fff !important; padding: 8px 16px; border-radius: 10px; font-weight: 700; font-size: 13px !important; }
.header-cta:hover { background: var(--violet-dark); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--violet); color: #fff; padding: 10px 16px; z-index: 50; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }

.breadcrumb { font-size: 12px; color: var(--muted); margin: 18px 0 4px; }
.breadcrumb a { color: var(--violet); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

h1 { font-size: 30px; line-height: 1.22; letter-spacing: -0.02em; margin: 10px 0 14px; font-weight: 800; }
h2 { font-size: 21px; line-height: 1.3; margin: 30px 0 12px; font-weight: 800; }
h3 { font-size: 17px; margin: 22px 0 8px; font-weight: 700; }
p, li { color: var(--ink); }
p { margin: 0 0 14px; }
ul, ol { padding-left: 22px; margin: 0 0 16px; }
li { margin-bottom: 6px; }
code, pre { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 13px; background: var(--violet-soft); padding: 2px 6px; border-radius: 6px; }
pre { padding: 14px 16px; overflow-x: auto; line-height: 1.5; border: 1px solid var(--line); }
pre code { background: transparent; padding: 0; }
.meta { color: var(--muted); font-size: 13px; margin: 0 0 18px; display: flex; gap: 12px; flex-wrap: wrap; }
.tag { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--violet-dark); background: var(--violet-soft); padding: 4px 10px; border-radius: 999px; text-decoration: none; }
.article { padding: 26px 0 60px; }

.cta-band { background: var(--violet-soft); border: 1px solid #d9d2f6; border-radius: 14px; padding: 20px; margin: 32px 0 0; }
.cta-band strong { color: var(--violet-dark); }
.cta-band a { display: inline-block; background: var(--violet); color: #fff; text-decoration: none; padding: 10px 18px; border-radius: 10px; font-weight: 700; margin-top: 10px; font-size: 14px; }
.cta-band a:hover { background: var(--violet-dark); }

.footer { border-top: 1px solid var(--line); background: var(--paper); padding: 22px 0; font-size: 12px; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; padding: 0 20px; max-width: 1080px; margin: 0 auto; }
.footer a { color: var(--violet); text-decoration: none; }

/* Blog index */
.post-list { display: grid; gap: 14px; margin-top: 20px; }
.post-card { display: flex; flex-direction: column; gap: 6px; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 18px; text-decoration: none; color: var(--ink); transition: border-color .15s ease, transform .15s ease; }
.post-card:hover { border-color: var(--violet); transform: translateY(-2px); }
.post-card h2 { margin: 0; font-size: 18px; order: 2; }
.post-card p { margin: 0; color: var(--muted); font-size: 13px; order: 3; }
.post-card .tag { align-self: flex-start; order: 1; }

/* Tools */
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; }
@media (max-width: 820px) { .tool-grid { grid-template-columns: 1fr; } .header-nav { display: none; } }
.tool-card { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 20px; text-decoration: none; color: var(--ink); }
.tool-card:hover { border-color: var(--violet); }
.tool-card h2 { margin: 0 0 8px; font-size: 17px; }
.tool-card p { margin: 0; font-size: 13px; color: var(--muted); }
.tool-card .tag { margin-bottom: 10px; }
.tool-panel { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 22px; margin-top: 18px; }
.tool-panel label { font-size: 12px; font-weight: 700; display: block; margin: 14px 0 6px; }
textarea, input[type="text"], input[type="password"], select { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; font: inherit; font-size: 14px; font-family: "SFMono-Regular", Consolas, monospace; background: var(--canvas); }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--violet); outline-offset: 1px; }
.output { background: #111a2e; color: #e6ebf5; border-radius: 10px; padding: 14px; min-height: 80px; font-family: "SFMono-Regular", Consolas, monospace; font-size: 13px; white-space: pre-wrap; word-break: break-word; margin-top: 12px; }
.button { border: none; border-radius: 10px; padding: 10px 16px; font: inherit; font-weight: 700; font-size: 13px; cursor: pointer; background: var(--violet); color: #fff; }
.button-secondary { background: var(--canvas); color: var(--ink); border: 1px solid var(--line); }
.button-row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.error-text { color: #a33737; font-size: 13px; margin-top: 10px; display: none; }
.result-line { padding: 6px 10px; border-radius: 6px; font-family: Consolas, monospace; font-size: 13px; white-space: pre-wrap; word-break: break-all; }
.result-err { background: #fdecec; color: #a33737; }
.result-warn { background: #fff7e0; color: #8a6100; }
.result-info { background: #eef4ff; color: #234e8f; }
.stat-chip { display: inline-block; background: var(--violet-soft); color: var(--violet-dark); border-radius: 8px; padding: 4px 12px; font-size: 12px; font-weight: 700; margin-right: 8px; }

/* Pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 22px 0; }
@media (max-width: 880px) { .pricing-grid { grid-template-columns: 1fr; } }
.price-card { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.price-card.highlight { border-color: var(--violet); box-shadow: 0 14px 36px rgba(105, 84, 217, .16); }
.price { font-size: 28px; font-weight: 800; letter-spacing: -0.02em; }
.price small { font-size: 13px; color: var(--muted); font-weight: 600; }
.price-card ul { margin: 0; font-size: 13px; color: var(--ink); }
.badge-best { align-self: flex-start; font-size: 11px; font-weight: 800; background: var(--violet-soft); color: var(--violet-dark); padding: 4px 10px; border-radius: 999px; }
.note { background: var(--canvas); border: 1px dashed var(--line); border-radius: 10px; padding: 12px 14px; font-size: 13px; color: var(--muted); margin-top: 10px; }