/* Trang gioi thieu (chua dang nhap). Dung bien mau trong style.css (sang/toi) */
body.ld { display: block; height: auto; overflow: auto; background: var(--panel-2); }
.ld-top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 18px; padding: 10px 24px; background: var(--panel); border-bottom: 1px solid var(--border); }
.ld-top .brand { text-decoration: none; color: var(--text); }
.ld-nav { display: flex; gap: 20px; }
.ld-nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.ld-nav a:hover { color: var(--text); }
.ld-btn { display: inline-block; padding: 9px 18px; border-radius: 6px; background: var(--on-text); color: #fff; font-weight: 600; font-size: 15px; text-decoration: none; border: 1px solid var(--on-text); cursor: pointer; }
.ld-btn:hover { filter: brightness(1.08); }
.ld-btn.ghost { background: transparent; color: var(--on-text); }
.ld-btn:disabled { opacity: .6; cursor: default; }
main { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.ld-hero { display: grid; grid-template-columns: 5fr 7fr; gap: 36px; align-items: center; padding: 56px 0 40px; }
.ld-hero h1 { font-size: 36px; line-height: 1.2; margin: 0 0 14px; }
.ld-hero p { font-size: 17px; line-height: 1.6; color: var(--muted); margin: 0 0 22px; }
.ld-cta { display: flex; gap: 10px; flex-wrap: wrap; }
.ld-shot { display: block; width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--border); box-shadow: 0 12px 32px rgba(0,0,0,.12); background: var(--panel); }
.ld-sec { padding: 36px 0; }
.ld-sec h2 { font-size: 26px; margin: 0 0 22px; text-align: center; }
.ld-row { display: grid; grid-template-columns: 7fr 5fr; gap: 32px; align-items: center; margin-bottom: 36px; }
.ld-row.rev { grid-template-columns: 5fr 7fr; }
.ld-row.rev .ld-shot { order: 2; }
.ld-row h3 { font-size: 20px; margin: 0 0 10px; }
.ld-row ul { margin: 0; padding-left: 20px; display: grid; gap: 7px; font-size: 15px; line-height: 1.5; }
.ld-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.ld-card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; }
.ld-card b { font-size: 15.5px; }
.ld-card span { color: var(--muted); font-size: 14px; line-height: 1.5; }
.ld-plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.ld-plan { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.ld-plan.hl { border: 2px solid var(--on-text); }
.ld-plan h3 { margin: 0; font-size: 19px; }
.ld-price { font-size: 24px; font-weight: 700; }
.ld-price small { font-size: 14px; color: var(--muted); font-weight: 400; }
.ld-plan ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 14px; flex: 1; }
.ld-plan li::before { content: '✓ '; color: var(--up); font-weight: 700; }
.ld-plan li.off { color: var(--muted); }
.ld-plan li.off::before { content: '✕ '; color: var(--muted); }
.ld-plan .lim { font-size: 13px; color: var(--muted); }
.ld-signup { max-width: 620px; margin: 0 auto; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 22px 24px; }
.ld-form { display: grid; gap: 12px; }
.ld-form[hidden] { display: none; }
.ld-form p { margin: 0; }
.ld-form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.ld-form input, .ld-form select, .ld-form textarea { font: inherit; font-size: 15px; color: var(--text); background: var(--panel); border: 1px solid var(--border); border-radius: 6px; padding: 9px 10px; }
.ld-form .two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.ld-form .ld-btn { justify-self: start; }
.ld-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.ld-err { color: var(--down); font-size: 14px; min-height: 18px; }
.ld-done b { font-size: 18px; }
.ld-done p { font-size: 15px; line-height: 1.6; }
.ld-foot { max-width: 1160px; margin: 20px auto 0; padding: 22px 20px 34px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
@media (max-width: 860px) {
  .ld-hero, .ld-row, .ld-row.rev { grid-template-columns: 1fr; }
  .ld-row.rev .ld-shot { order: 0; }
  .ld-hero { padding-top: 30px; }
  .ld-hero h1 { font-size: 28px; }
  .ld-grid { grid-template-columns: 1fr; }
  .ld-nav { display: none; }
  .ld-top { padding: 10px 16px; gap: 10px; }
  main { padding: 0 16px; }
}
@media (max-width: 520px) {
  .ld-form .two { grid-template-columns: 1fr; }
  .ld-signup { padding: 18px 16px; }
}