/* YTHUAT.VN — /docs/ shared style */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Be Vietnam Pro',sans-serif;background:#FDF0E2;color:#1E293B;line-height:1.75}
.wrap{max-width:820px;margin:40px auto;padding:0 20px}
.card{background:#fff;border-radius:20px;padding:40px 36px;position:relative}

/* Crumb nav — v2: pin góc phải trên, pill style */
.crumb{
  position:absolute;top:28px;right:28px;
  font-size:12px;margin:0;z-index:1;
}
.crumb a{
  display:inline-block;padding:6px 14px;
  color:#64748B;text-decoration:none;
  background:#F8FAFC;border:1px solid #E2E8F0;border-radius:100px;
  font-weight:500;
  transition:all 0.2s;
}
.crumb a:hover{
  color:#0284C7;background:#F0F9FF;border-color:#BAE6FD;
}

/* Tiêu đề — v2: đậm hơn (800), lớn hơn (28px), có space bên phải tránh đè crumb */
h1{
  font-size:28px;color:#0284C7;margin-bottom:6px;
  display:flex;align-items:center;gap:10px;
  font-weight:800;letter-spacing:-0.01em;
  padding-right:120px;
}
.sub{font-size:13px;color:#64748B;margin-bottom:24px}

/* Section header */
h2{font-size:15px;color:#0284C7;margin:28px 0 10px;padding-top:18px;border-top:1px solid #E2E8F0;display:flex;align-items:center;gap:8px;font-weight:700}
h2:first-of-type{border-top:none;padding-top:0;margin-top:20px}

h3{font-size:13px;color:#334155;margin:14px 0 6px;font-weight:700}

/* Paragraph */
p{font-size:14px;margin-bottom:8px}

/* List */
ul,ol{margin:6px 0 12px 4px;padding-left:20px}
li{font-size:14px;margin-bottom:5px;line-height:1.7}
li::marker{color:#0284C7}

/* Nhấn mạnh */
strong{color:#0F172A;font-weight:700}
.hi{color:#E65100;font-weight:700}         /* highlight cam — số liệu, USP */
.alert{color:#DC2626;font-weight:700}      /* cảnh báo đỏ */
.ok{color:#16A34A;font-weight:700}         /* xanh — tích cực */

/* Block box */
.box{border-radius:10px;padding:14px 18px;margin:10px 0;font-size:13px}
.box-info{background:#F0F9FF;border-left:3px solid #0EA5E9}
.box-tip{background:#FFF8E1;border-left:3px solid #F59E0B}
.box-warn{background:#FEF2F2;border-left:3px solid #DC2626}
.box-warn strong{color:#991B1B}

/* Bảng giá inline */
.price{display:inline-block;background:#FFF3E0;color:#E65100;font-weight:700;font-size:12px;padding:1px 8px;border-radius:5px}

/* Ví dụ hỏi ✗/✓ */
.ex{font-size:13px;margin:4px 0 4px 14px;line-height:1.7}
.ex-bad{color:#94A3B8}
.ex-bad::before{content:"✗ ";color:#DC2626;font-weight:700}
.ex-good::before{content:"✓ ";color:#16A34A;font-weight:700}

/* Divider */
.divider{height:1px;background:#E2E8F0;margin:24px 0}

/* Related links cuối trang */
.related{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.related a{
  display:inline-block;padding:8px 16px;border-radius:8px;
  text-decoration:none;font-size:13px;font-weight:600;
  background:#fff;color:#0284C7;border:1.5px solid #0284C7;
  transition:all 0.15s;
}
.related a:hover{background:#0284C7;color:#fff}

/* Back link */
.back{
  display:inline-block;margin-top:28px;padding:10px 20px;
  border-radius:10px;text-decoration:none;font-size:13px;font-weight:600;
  background:#0284C7;color:#fff;
}
.back:hover{background:#0369A1}

/* Footer */
.footer{text-align:center;font-size:12px;color:#94A3B8;padding:20px 0}

/* Index page — grid của các app */
.apps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin-top:14px}
.app{
  display:block;padding:20px 22px;border-radius:14px;
  text-decoration:none;background:#F8FAFC;
  border:1.5px solid #E2E8F0;
  transition:all 0.2s;
}
.app:hover{border-color:#0284C7;background:#F0F9FF;transform:translateY(-2px)}
.app-title{font-size:16px;font-weight:700;color:#0284C7;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.app-desc{font-size:13px;color:#475569;line-height:1.6}
.app-soon{opacity:0.5;pointer-events:none}
.app-soon .app-title{color:#64748B}
.app-soon::after{content:"Đang hoàn thiện";display:inline-block;margin-top:8px;font-size:11px;color:#F57C00;font-weight:600;background:#FFF3E0;padding:2px 8px;border-radius:5px}

/* Mobile — crumb về lại trên cùng, không đè H1 */
@media (max-width:600px){
  .card{padding:32px 24px}
  .crumb{position:static;margin-bottom:16px}
  .crumb a{padding:5px 12px;font-size:11px}
  h1{font-size:24px;padding-right:0}
}