:root { --nen: #f6f7f9; --chu: #1c2430; --nhan: #0b6bcb; --vien: #d7dce3; }
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--nen); color: var(--chu); line-height: 1.55; }
header { background: #fff; border-bottom: 1px solid var(--vien); padding: 14px 16px; }
header a { color: var(--chu); text-decoration: none; font-weight: 700; }
main { max-width: 960px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.5rem; margin: .2em 0 .5em; }
.the { background: #fff; border: 1px solid var(--vien); border-radius: 10px; padding: 16px; margin-bottom: 16px; }
.luoi { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.luoi a.the { text-decoration: none; color: inherit; margin: 0; }
.luoi a.the:hover { border-color: var(--nhan); }
.luoi .sap { opacity: .5; }
label { display: block; font-weight: 600; margin: 8px 0 4px; }
textarea, input[type=number] { width: 100%; padding: 8px; border: 1px solid var(--vien);
  border-radius: 6px; font: inherit; }
button { background: var(--nhan); color: #fff; border: 0; border-radius: 6px;
  padding: 10px 16px; font: inherit; font-weight: 600; cursor: pointer; margin: 10px 8px 0 0; }
button.phu { background: #fff; color: var(--nhan); border: 1px solid var(--nhan); }
pre { background: #101820; color: #d6f5d6; padding: 12px; border-radius: 8px;
  overflow: auto; max-height: 360px; font-size: 13px; white-space: pre-wrap; word-break: break-all; }
iframe { width: 100%; height: 420px; border: 1px solid var(--vien); border-radius: 8px; background: #fff; }
.canhbao { background: #fff7e0; border: 1px solid #f0d58a; border-radius: 8px; padding: 10px 12px; margin-top: 10px; }
.hai-cot { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 800px) { .hai-cot { grid-template-columns: 1fr 1fr; } }