:root {
  --navy: #0b1f3a;
  --navy-2: #13325c;
  --accent: #e8a33d;
  --accent-2: #c9852a;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1b2433;
  --muted: #5d6b80;
  --line: #e2e7ee;
  --ok: #1f8a4c;
  --err: #c0392b;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.55; font-size: 16px;
}
a { color: var(--navy-2); }
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 16px; }

/* Header */
.top { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 10; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.logo { color: #fff; text-decoration: none; font-weight: 800; letter-spacing: .3px; font-size: 17px; }
.logo small { display: block; font-weight: 400; font-size: 11px; color: #a9b8cf; letter-spacing: .5px; }
.nav { display: flex; gap: 18px; align-items: center; }
.nav a { color: #dbe4f0; text-decoration: none; font-size: 15px; }
.nav a:hover { color: #fff; }
.nav .btn { color: var(--navy); }

/* Buttons */
.btn {
  display: inline-block; border: 0; border-radius: 8px; padding: 10px 18px; font: inherit; font-weight: 600;
  background: var(--accent); color: var(--navy); cursor: pointer; text-decoration: none; text-align: center;
}
.btn:hover { background: var(--accent-2); }
.btn.ghost { background: transparent; border: 1px solid var(--line); color: var(--text); }
.btn.navy { background: var(--navy); color: #fff; }
.btn:disabled { opacity: .6; cursor: wait; }
.btn.block { display: block; width: 100%; }

/* Hero */
.hero { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%); color: #fff; padding: 56px 0 64px; }
.hero h1 { font-size: clamp(28px, 4.5vw, 44px); line-height: 1.2; margin: 0 0 14px; max-width: 760px; }
.hero p { color: #c6d3e6; font-size: 18px; max-width: 680px; margin: 0 0 26px; }
.hero .stats { display: flex; gap: 32px; flex-wrap: wrap; margin-top: 32px; color: #c6d3e6; font-size: 14px; }
.hero .stats b { display: block; color: #fff; font-size: 24px; }
.search { display: flex; gap: 8px; max-width: 620px; }
.search input { flex: 1; min-width: 0; }

/* Forms */
input, select, textarea {
  font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 8px; width: 100%; background: #fff; color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--accent); border-color: transparent; }
label { display: block; font-size: 14px; font-weight: 600; margin: 14px 0 6px; }
label .opt { font-weight: 400; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 7px 14px; font-size: 14px; cursor: pointer; user-select: none;
}
.chip.on, .chip:has(input:checked) { background: var(--navy); color: #fff; border-color: var(--navy); }
.chip input { display: none; }

/* Sections & cards */
section { padding: 40px 0; scroll-margin-top: 60px; } /* chừa chỗ cho thanh đầu trang cố định */
h2 { font-size: 26px; margin: 0 0 18px; }
.notice { background: #fff6e5; border: 1px solid #f3d9a6; color: #7a5413; padding: 10px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 18px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column;
  text-decoration: none; color: inherit; transition: box-shadow .15s, transform .15s;
}
a.card:hover { box-shadow: 0 8px 24px rgba(11, 31, 58, .08); transform: translateY(-2px); }
.card .tag { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .6px; }
.card h3 { font-size: 18px; margin: 6px 0 8px; line-height: 1.35; }
.card p { color: var(--muted); font-size: 14px; margin: 0 0 14px; flex: 1; }
.card .meta { display: flex; justify-content: space-between; align-items: center; font-size: 14px; border-top: 1px solid var(--line); padding-top: 12px; }
.price { font-weight: 700; color: var(--navy); }
.badge { display: inline-block; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 4px; background: #e9eef6; color: var(--navy-2); }
.badge.VIP { background: var(--accent); color: var(--navy); }
.badge.FREE { background: #e3f4ea; color: var(--ok); }
.empty { color: var(--muted); padding: 30px 0; text-align: center; }

/* Danh mục lớn */
.dm-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; margin-bottom: 36px; }
.dm-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; cursor: pointer;
  border-top: 4px solid var(--navy-2); transition: box-shadow .15s, transform .15s; text-align: left; font: inherit; color: inherit;
}
.dm-card:hover, .dm-card.on { box-shadow: 0 8px 24px rgba(11, 31, 58, .1); transform: translateY(-2px); }
.dm-card.on { border-top-color: var(--accent); }
.dm-card .so { float: right; font-size: 12px; color: var(--muted); background: var(--bg); border-radius: 999px; padding: 2px 10px; }
.dm-card h3 { font-size: 17px; line-height: 1.35; margin: 0 0 6px; }
.dm-card p { color: var(--muted); font-size: 14px; margin: 0 0 10px; }
.dm-card ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.dm-card li { font-size: 12.5px; background: #eef2f8; color: var(--navy-2); border-radius: 4px; padding: 3px 8px; }
.dm-card li.them { background: transparent; color: var(--muted); }
.loc { display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.chips.con .chip { font-size: 13px; padding: 5px 12px; background: #f7f9fc; }
.chips.con .chip.on { background: var(--accent); border-color: var(--accent); color: var(--navy); }
.duong-dan { font-size: 12px; color: var(--muted); text-transform: none; letter-spacing: 0; }

/* Trang bài viết báo cáo */
.bai h1 { font-size: clamp(24px, 3.5vw, 32px); line-height: 1.25; margin: 6px 0 16px; }
.bai .duong-dan a { color: var(--muted); text-decoration: none; }
.bai .duong-dan a:hover { color: var(--navy-2); text-decoration: underline; }
.nguon-ngoai { border: 1px solid #f3d9a6; background: #fffaf0; border-radius: var(--radius); padding: 16px 18px; margin: 0 0 24px; }
.nguon-ngoai .nhan { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .6px; text-transform: uppercase; color: #8a5a10; background: #fdecc8; border-radius: 4px; padding: 2px 8px; }
.nguon-ngoai .thuong-hieu { font-size: 22px; font-weight: 800; color: var(--navy); margin-top: 8px; }
.nguon-ngoai .don-vi { color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.nguon-ngoai dl.info { margin: 10px 0 14px; grid-template-columns: 110px 1fr; }
.nut-tai { font-size: 16px; padding: 12px 22px; }
.noi-dung { font-size: 17px; line-height: 1.75; }
.noi-dung h2 { font-size: 20px; margin: 28px 0 10px; color: var(--navy); }
.noi-dung ul { padding-left: 22px; }
.noi-dung li { margin-bottom: 6px; }
.cuoi-bai { border-top: 1px solid var(--line); margin-top: 28px; padding-top: 22px; }
.ban-quyen { color: var(--muted); font-size: 13px; margin-top: 14px; }

/* Pricing */
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.plan { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.plan.hot { border: 2px solid var(--accent); }
.plan h3 { margin: 0 0 4px; }
.plan ul { padding-left: 18px; color: var(--muted); font-size: 15px; }

/* Panel (auth / account) */
.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; max-width: 480px; margin: 40px auto; }
.panel.wide { max-width: 760px; }
.tabs { display: flex; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.tabs button { flex: 1; background: none; border: 0; padding: 12px; font: inherit; font-weight: 600; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; }
.tabs button.on { color: var(--navy); border-bottom-color: var(--accent); }
.or { text-align: center; color: var(--muted); font-size: 13px; margin: 18px 0; position: relative; }
.msg { margin-top: 12px; font-size: 14px; min-height: 20px; }
.msg.err { color: var(--err); }
.msg.ok { color: var(--ok); }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
dl.info { display: grid; grid-template-columns: 140px 1fr; gap: 8px 12px; margin: 0; }
dl.info dt { color: var(--muted); }
dl.info dd { margin: 0; font-weight: 500; word-break: break-word; }
.copy { display: flex; gap: 8px; }

footer { background: var(--navy); color: #8fa3bf; font-size: 14px; padding: 28px 0; margin-top: 40px; }

@media (max-width: 640px) {
  .nav a:not(.btn) { display: none; }
  .dm-grid { grid-template-columns: 1fr; }
  .loc .chips { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
  .loc .chip { white-space: nowrap; }
  .row { grid-template-columns: 1fr; }
  dl.info { grid-template-columns: 1fr; gap: 2px; }
  dl.info dd { margin-bottom: 8px; }
  .panel { padding: 20px; margin: 20px auto; }
  .hero { padding: 36px 0 44px; }
  .search { flex-direction: column; }
}