:root {
  --giay: #fbf0d9;
  --giay-dam: #f3dfb6;
  --vien: #d9b77a;
  --go: #6b2d12;
  --go-dam: #3f1a0a;
  --do: #b8261b;
  --do-dam: #8a1a12;
  --vang: #f2b632;
  --chu: #3b2414;
  --chu-nhat: #64462c;
  --xanh: #2f7d32;
  --nen: #e9c98f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  color: var(--chu);
  background: var(--nen) radial-gradient(circle at 20% 0%, #f7deaa 0, transparent 45%) fixed;
  line-height: 1.55;
}

.khung { max-width: 960px; margin: 0 auto; padding: 16px; }

/* ---------- dau trang ---------- */
.dau {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  padding: 22px 16px 18px;
  background: var(--giay);
  border: 2px solid var(--vien);
  border-radius: 16px;
}
.logo { text-decoration: none; text-align: center; display: grid; }
.logo-nho { font-weight: 700; font-size: 13px; letter-spacing: 3px; text-transform: uppercase; color: var(--chu-nhat); }
.logo-ten {
  font-family: "Baloo 2", sans-serif; font-weight: 800; font-size: clamp(38px, 8vw, 60px); line-height: 1;
  color: var(--vang);
  -webkit-text-stroke: 2px var(--go-dam);
  text-shadow: 0 4px 0 var(--do-dam), 0 6px 12px rgba(63, 26, 10, .35);
}
.nut-dau { display: flex; gap: 10px; }

.nut {
  display: inline-block; padding: 9px 18px; border-radius: 10px;
  font-weight: 700; text-decoration: none; border: 2px solid var(--go-dam);
  box-shadow: 0 3px 0 var(--go-dam); transition: transform .08s, box-shadow .08s;
  cursor: pointer; font: inherit; font-weight: 700;
}
.nut:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--go-dam); }
.nut-do { background: var(--do); color: #fff3d6; }
.nut-do:hover { background: var(--do-dam); }
.nut-vang { background: var(--vang); color: var(--go-dam); }
.nut-vang:hover { background: #e3a51f; }
.nut-to { font-size: 18px; padding: 12px 28px; }
.nut-rong { width: 100%; margin-top: 6px; font-size: 16px; padding: 12px; }
.nut:disabled { opacity: .6; cursor: wait; }

/* ---------- menu ---------- */
.menu {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px;
  margin: 14px 0;
}
.menu a {
  padding: 7px 16px; border-radius: 999px; text-decoration: none; font-weight: 700; font-size: 14px;
  background: var(--go); color: #ffe7b0; border: 2px solid var(--go-dam);
}
.menu a:hover { background: var(--do); }

/* ---------- banner ---------- */
.banner {
  position: relative; overflow: hidden;
  display: grid; grid-template-columns: 1.4fr 1fr; align-items: center; gap: 12px;
  padding: 26px 28px;
  border-radius: 16px; border: 2px solid var(--go-dam);
  background: linear-gradient(135deg, #4a1d0b 0%, #7c2a12 55%, #b8461b 100%);
  color: #ffeec8;
}
.banner h1 { font-family: "Baloo 2", sans-serif; font-size: clamp(26px, 4.5vw, 38px); line-height: 1.15; margin: 4px 0 8px; color: #fff; }
.banner p { margin: 0 0 16px; }
.banner-nho { display: inline-block; margin: 0 !important; padding: 2px 10px; border-radius: 999px; background: var(--xanh); color: #eaffea; font-size: 13px; font-weight: 700; }
.banner-hinh { position: relative; height: 170px; }
.bh { position: absolute; width: 96px; height: 96px; image-rendering: pixelated; border-radius: 14px; border: 3px solid #ffd27a; box-shadow: 0 8px 18px rgba(0, 0, 0, .4); }
.bh1 { left: 8%; top: 8px; transform: rotate(-8deg); }
.bh2 { right: 6%; top: 0; transform: rotate(7deg); }
.bh3 { left: 36%; bottom: 0; transform: rotate(2deg); }

/* ---------- the noi dung ---------- */
.luoi { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; }
.the {
  background: var(--giay); border: 2px solid var(--vien); border-radius: 16px;
  padding: 18px 20px; margin-top: 14px; scroll-margin-top: 12px;
}
.luoi .the { margin-top: 0; }
.tieu-de {
  margin: 0 0 14px; font-family: "Baloo 2", sans-serif; font-size: 22px; color: var(--go);
  border-bottom: 2px dashed var(--vien); padding-bottom: 6px;
}

label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 10px; }
input {
  display: block; width: 100%; margin-top: 4px; padding: 11px 12px; font: inherit;
  border: 2px solid var(--vien); border-radius: 10px; background: #fffaf0; color: var(--chu);
}
input:focus { outline: none; border-color: var(--do); box-shadow: 0 0 0 3px rgba(184, 38, 27, .15); }
.an-di { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.thong-bao { min-height: 1.4em; margin: 10px 0 0; font-weight: 700; }
.thong-bao.ok { color: var(--xanh); }
.thong-bao.loi { color: var(--do); }
.ghi-chu { font-size: 13px; color: var(--chu-nhat); margin: 12px 0 0; }

.tai {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px;
  padding: 12px 14px; margin-bottom: 10px; border-radius: 12px; text-decoration: none;
  background: var(--go); color: #ffe7b0; border: 2px solid var(--go-dam);
}
a.tai:hover { background: var(--do); }
.tai-loai { font-weight: 800; background: var(--vang); color: var(--go-dam); padding: 2px 10px; border-radius: 8px; font-size: 13px; }
.tai-ten { font-weight: 700; }
.tai-mo { font-size: 13px; }
.tai-khoa { background: var(--giay-dam); color: var(--chu-nhat); border-color: var(--vien); }
.tai-khoa .tai-loai { background: #e2cfa5; color: var(--chu); }

.o-luoi { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.o { background: #fffaf0; border: 2px solid var(--vien); border-radius: 12px; padding: 14px; }
.o img { width: 48px; height: 48px; image-rendering: pixelated; border-radius: 10px; }
.o h3 { margin: 8px 0 4px; font-size: 16px; color: var(--do-dam); }
.o p { margin: 0; font-size: 14px; }

.phai-luoi { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.phai { background: #fffaf0; border: 2px solid var(--vien); border-radius: 10px; padding: 10px 12px; display: grid; }
.phai b { font-family: "Baloo 2", sans-serif; font-size: 18px; color: var(--go); }
.phai span { font-size: 13px; color: var(--chu-nhat); }

.buoc { margin: 0; padding-left: 22px; }
.buoc li { margin-bottom: 6px; }

.chan { text-align: center; font-size: 13px; color: var(--chu-nhat); padding: 18px 0 8px; }
.chan p { margin: 4px 0; }

/* ---------- dien thoai ---------- */
@media (max-width: 760px) {
  .banner { grid-template-columns: 1fr; padding: 22px 18px; }
  .banner-hinh { height: 120px; }
  .bh { width: 72px; height: 72px; }
  .luoi { grid-template-columns: 1fr; }
  .o-luoi { grid-template-columns: 1fr 1fr; }
  .phai-luoi { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 420px) {
  .khung { padding: 10px; }
  .o-luoi { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .nut { transition: none; }
}