/* Trang giới thiệu */
.lp { background: var(--bg); }
.lp-head {
  display: flex; align-items: center; gap: 24px; padding: 16px clamp(16px, 4vw, 56px);
  position: sticky; top: 0; z-index: 20; background: rgba(20, 26, 38, .9); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.lp-head .brand { padding: 0; }
.lp-links { display: flex; gap: 22px; margin-left: 12px; }
.lp-links a { color: var(--muted); font-weight: 500; }
.lp-links a:hover { color: var(--text); text-decoration: none; }
.lp-cta { margin-left: auto; display: flex; gap: 8px; }

.hero {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: center;
  padding: clamp(40px, 7vw, 96px) clamp(16px, 4vw, 56px) clamp(48px, 6vw, 88px); max-width: 1320px; margin: 0 auto;
}
.hero h1 {
  font-size: clamp(42px, 6.4vw, 84px); font-weight: 800; line-height: .98; letter-spacing: -0.035em;
  font-variation-settings: 'opsz' 96;
}
.lead { font-size: clamp(17px, 1.6vw, 20px); color: #c4ccda; max-width: 38ch; margin: 22px 0 28px; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.facts { list-style: none; padding: 0; margin: 40px 0 0; display: grid; grid-template-columns: repeat(3, auto); gap: 28px; justify-content: start; }
.facts li { display: grid; gap: 2px; border-left: 2px solid var(--amber); padding-left: 12px; }
.facts b { font-family: var(--display); font-size: 20px; }
.facts span { font-size: 13px; color: var(--muted); max-width: 16ch; }

/* Bàn máy minh hoạ */
.rig {
  margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 16px; display: grid; gap: 12px;
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .6);
}
.rig-screen { position: relative; aspect-ratio: 16 / 10; border-radius: 10px; overflow: hidden; background: #0a0e16; }
.rig-screen video { width: 100%; height: 100%; object-fit: cover; }
.rig-cover {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center; background: #0a0e16;
  transition: opacity .8s ease;
}
.rig-cover span { font-family: var(--display); font-size: 56px; font-weight: 700; }
.rig-cover small { color: var(--muted); }
.rig-cover.gone { opacity: 0; pointer-events: none; }
.rig-prompt { background: #111723; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; min-height: 76px; }
.rig-prompt span { font-size: 12px; }
.rig-prompt p { margin: 2px 0 0; font-size: 14.5px; }
.rig-strip i { height: 16px; }
.rig-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.rig-meta span { font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; background: var(--raised); color: var(--muted); }

.band { padding: clamp(48px, 7vw, 96px) clamp(16px, 4vw, 56px); max-width: 1320px; margin: 0 auto; border-top: 1px solid var(--line); }
.band h2 { font-size: clamp(28px, 3.4vw, 44px); font-weight: 800; letter-spacing: -0.02em; max-width: 22ch; }
.band .sub { max-width: 60ch; margin: 12px 0 0; }
.steps { list-style: none; counter-reset: s; padding: 0; margin: 36px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.steps li { counter-increment: s; display: grid; gap: 8px; align-content: start; }
.steps li::before {
  content: counter(s); font-family: var(--display); font-size: 15px; font-weight: 700; width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; border: 1.5px solid var(--amber); color: var(--amber);
}
.steps p, .use-grid p { color: var(--muted); margin: 0; max-width: 42ch; }

.price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 32px 0 16px; }
.price { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; display: grid; gap: 10px; align-content: start; }
.price:first-child { border-color: #6b5426; }
.price h3 { font-size: 22px; }
.price p { margin: 0; }
.price dl { margin: 6px 0; display: grid; gap: 8px; }
.price dl div { display: flex; justify-content: space-between; align-items: baseline; padding: 10px 0; border-top: 1px solid var(--line); }
.price dt { color: var(--muted); font-weight: 600; }
.price dd { margin: 0; display: grid; justify-items: end; }
.price dd b { font-family: var(--display); font-size: 22px; }
.price dd span { font-size: 12.5px; }

.use-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 28px; margin-top: 32px; }
.use-grid h3 { margin-bottom: 6px; }

.faq { margin-top: 28px; display: grid; max-width: 820px; }
.faq details { border-bottom: 1px solid var(--line); padding: 16px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 16.5px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::after { content: '+'; color: var(--amber); font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: '−'; }
.faq p { color: var(--muted); margin: 10px 0 0; max-width: 70ch; }

.end { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.lp-foot { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 24px clamp(16px, 4vw, 56px); border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }

@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .lp-links { display: none; }
}
@media (max-width: 560px) {
  .facts { grid-template-columns: 1fr; gap: 14px; }
  .lp-cta .ghost { display: none; }
}