/* Giao diện mẫu MiniCMS — trung tính, sạch, dùng được ngay cho website mới. Đổi --accent là đổi màu chủ đạo. */
:root { --accent: #4F46E5; --accent-d: #4338CA; --ink: #111827; --text: #4B5563; --muted: #6B7280; --line: #E5E7EB; --bg: #FFFFFF; --alt: #F9FAFB; --radius: 14px; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--text); background: var(--bg); line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { color: var(--ink); line-height: 1.25; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
.wrap { width: min(1100px, 100% - 40px); margin-inline: auto; }
.wrap-narrow { width: min(780px, 100% - 40px); }
.center { text-align: center; }

/* Header */
.hd { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, .92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.hd-in { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand img { height: 36px; width: auto; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { padding: 8px 14px; border-radius: 10px; color: var(--text); font-weight: 500; }
.nav a:hover { background: var(--alt); text-decoration: none; }
.nav a.is-active { color: var(--accent); background: #EEF2FF; }
.nav-group { position: relative; }
.nav-sub { position: absolute; top: 100%; left: 0; min-width: 180px; padding: 6px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 10px 30px -12px rgba(0, 0, 0, .2); display: none; }
.nav-group:hover .nav-sub, .nav-group:focus-within .nav-sub { display: grid; }
.menu-btn { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 10px; background: #fff; cursor: pointer; flex-direction: column; justify-content: center; align-items: center; gap: 4px; }
.menu-btn span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }

/* Nút */
.btn { display: inline-block; padding: 12px 22px; border-radius: 12px; font-weight: 700; border: 1.5px solid transparent; cursor: pointer; font: inherit; font-weight: 700; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-d); }
.btn-ghost { background: #fff; color: var(--accent); border-color: var(--accent); }
.btn-ghost:hover { background: #EEF2FF; }

/* Khối trang */
.hero { padding: 88px 0 72px; background: linear-gradient(180deg, #EEF2FF, #fff); text-align: center; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); letter-spacing: -.02em; }
.lead { font-size: 18px; max-width: 620px; margin-inline: auto; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }
.page-head { padding: 56px 0 40px; background: var(--alt); border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: clamp(28px, 4vw, 40px); margin: 0; }
.section { padding: 64px 0; }
.section-alt { background: var(--alt); }
.section-title { font-size: 28px; margin-bottom: 28px; }
.more { margin-top: 24px; font-weight: 600; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }
.rich { max-width: 780px; }
.rich img { border-radius: 12px; margin: 1em 0; }
.rich h2, .rich h3 { margin-top: 1.6em; }
.rich blockquote { margin: 1em 0; padding: .6em 1.2em; border-left: 4px solid var(--accent); background: var(--alt); border-radius: 0 10px 10px 0; }
.hero .rich { margin-inline: auto; }

/* Bảng giá */
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.plan.is-hot { border: 2px solid var(--accent); box-shadow: 0 20px 40px -24px rgba(79, 70, 229, .5); }
.plan-tag { position: absolute; top: -12px; left: 24px; padding: 3px 12px; border-radius: 999px; background: var(--accent); color: #fff; font-size: 12px; font-weight: 700; }
.plan-desc { color: var(--muted); font-size: 14px; }
.plan-price { font-size: 30px; font-weight: 800; color: var(--ink); margin: .2em 0 .8em; }
.plan-price small { font-size: 14px; font-weight: 500; color: var(--muted); }
.plan-features { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 8px; flex: 1; }
.plan-features li::before { content: "✓"; color: var(--accent); font-weight: 800; margin-right: 8px; }

/* Tin tức */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.card img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.card-body { padding: 18px 20px 22px; }
.card-body h3 { font-size: 18px; margin: .2em 0 .4em; }
.card-body h3 a { color: var(--ink); }
.card-body p { font-size: 14px; color: var(--muted); margin: 0; }
.card time, .article-meta { font-size: 13px; color: var(--muted); }
.pager { display: flex; justify-content: center; gap: 6px; margin-top: 36px; flex-wrap: wrap; }
.pager a { padding: 8px 14px; border: 1px solid var(--line); border-radius: 10px; color: var(--text); }
.pager a.is-current { background: var(--accent); border-color: var(--accent); color: #fff; }
.crumb { font-size: 14px; color: var(--muted); }
.article-title { font-size: clamp(28px, 4vw, 40px); margin-bottom: .3em; }
.article-cover { border-radius: var(--radius); margin: 20px 0 28px; width: 100%; }

/* Liên hệ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; }
.form { display: grid; gap: 16px; }
.form label { display: grid; gap: 6px; font-weight: 600; color: var(--ink); font-size: 14px; }
.form input, .form textarea { padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px; font: inherit; color: var(--ink); }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--accent); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.req { color: #DC2626; }
.notice { padding: 14px 18px; border-radius: 12px; margin-bottom: 20px; }
.notice ul { margin: 0; padding-left: 18px; }
.notice-ok { background: #ECFDF5; color: #065F46; border: 1px solid #A7F3D0; }
.notice-error { background: #FEF2F2; color: #991B1B; border: 1px solid #FECACA; }
.big-404 { font-size: 96px; font-weight: 900; color: var(--accent); margin: 0; line-height: 1; }

/* Footer */
.ft { background: #111827; color: #9CA3AF; padding: 48px 0 0; font-size: 14px; }
.ft a { color: #E5E7EB; }
.ft-in { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px; }
.ft-brand { font-size: 18px; font-weight: 800; color: #fff; }
.ft-links { display: flex; gap: 16px; flex-wrap: wrap; align-items: flex-start; }
.ft-bottom { margin-top: 32px; padding: 18px 0; border-top: 1px solid rgba(255, 255, 255, .1); }

@media (max-width: 820px) {
  .menu-btn { display: flex; }
  .nav { position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 20px 16px; display: none; }
  .nav.open { display: flex; }
  .nav-sub { position: static; display: grid; border: 0; box-shadow: none; padding-left: 14px; }
  .contact-grid, .ft-in { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 44px 0; }
  .hero { padding: 56px 0 48px; }
}