/*
Theme Name: VN Number SEO Theme
Theme URI: https://example.com/vn-number-seo-theme
Author: VNNumber
Author URI: https://example.com
Description: Theme tối ưu SEO, nhẹ, hiện đại – thiết kế riêng cho plugin VN Number Lite (trang chuyển đổi số ↔ chữ). Bao gồm OG/Twitter tags, canonical, robots, JSON-LD (WebSite, WebPage/Article, Breadcrumb), breadcrumbs, hero gradient, responsive.
Version: 1.0.0
License: GPL-2.0+
Text Domain: vn-number-seo-theme
Tags: seo, responsive, minimal, landing-page
*/

/* Base reset & typography */
:root{
  --g1:#2563eb; --g2:#7c3aed;
  --text:#111827; --muted:#475569; --bd:#e5e7eb; --bg:#ffffff;
  --max: 1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:#f7f8fb;line-height:1.6}
a{color:#2563eb;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.container{max-width:var(--max);margin:0 auto;padding:0 16px}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--bd)}
.site-brand{display:flex;align-items:center;gap:10px;padding:14px 0}
.site-brand .logo{width:36px;height:36px;border-radius:8px;background:linear-gradient(135deg,var(--g1),var(--g2));display:inline-block}
.site-title{font-weight:800;font-size:18px;margin:0}

/* Hero */
.hero{background:linear-gradient(135deg,var(--g1),var(--g2));color:#fff;padding:56px 0 64px;border-radius:0 0 14px 14px;box-shadow:0 18px 40px rgba(17,24,39,.18)}
.hero h1{margin:0 0 8px;font-size:34px;font-weight:900;text-align:center}
.hero p{margin:0;text-align:center;opacity:.95}

/* Main card */
.card{background:#fff;border:1px solid var(--bd);border-radius:16px;box-shadow:0 12px 36px rgba(17,24,39,.10);padding:22px;margin:-28px auto 28px;max-width:var(--max)}

/* Footer */
.site-footer{border-top:1px solid var(--bd);background:#fff;color:#475569}
.site-footer .container{padding:18px 0}
small{color:#64748b}

/* Breadcrumbs */
.breadcrumbs{font-size:14px;color:#64748b;margin:10px 0}
.breadcrumbs a{color:#64748b}
.breadcrumbs span.sep{margin:0 6px}

/* Content */
.entry-title{font-size:28px;margin:12px 0}
.entry-content{margin:16px 0}
.wp-block{max-width:var(--max)}

/* Accessibility */
.skip-link{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:8px;top:8px;width:auto;height:auto;background:#111827;color:#fff;padding:8px 10px;border-radius:6px;z-index:9999}
.site-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.site-logo img {
  max-height: 42px;
  width: auto;
  display: block;
}
.site-nav .menu {
  display: flex;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav .menu li a {
  color: #111827;
  font-weight: 600;
  text-decoration: none;
  transition: color .25s;
}
.site-nav .menu li a:hover {
  color: #2563eb;
}
@media (max-width: 768px) {
  .site-nav .menu { flex-wrap: wrap; gap: 12px; }
}
html {
  color-scheme: light !important;
  background: #ffffff !important;
}
body {
  background: #ffffff !important;
  color: #111827 !important;
}
@media (prefers-color-scheme: dark) {
  html, body {
    background: #ffffff !important;
    color: #111827 !important;
  }
}