/* Kênh Faceless 7 Bước — landing tĩnh, không phụ thuộc mạng ngoài */

*, *::before, *::after { box-sizing: border-box; }

:root {
  --ink: #14161a;
  --ink-soft: #464d57;
  --muted: #6b7381;
  --line: #e2e5ea;
  --paper: #ffffff;
  --band: #f6f7f9;
  --accent: #14524a;
  --accent-soft: #e6f0ee;
  --danger: #8c3b2f;
  --radius: 10px;
}

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "DejaVu Sans", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); }

.wrap {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
}
.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.01em;
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  padding: 14px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  transition: opacity 0.15s ease;
}
.btn:hover { opacity: 0.88; }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--accent-soft); opacity: 1; }

/* Hero */
.hero { padding: 56px 0 40px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 48px;
  align-items: start;
}
.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
h1 {
  margin: 0 0 20px;
  font-size: 42px;
  line-height: 1.2;
  letter-spacing: -0.015em;
}
.lede {
  margin: 0 0 22px;
  font-size: 19px;
  color: var(--ink-soft);
}
.ticks {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
}
.ticks li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 9px;
  color: var(--ink-soft);
}
.ticks li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: 700;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}
.micro {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.hero-art img {
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(20, 22, 26, 0.12);
}

/* Bands & sections */
.band {
  background: var(--band);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 56px 0;
}
.section { padding: 56px 0; }

h2 {
  margin: 0 0 14px;
  font-size: 30px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
h3 {
  margin: 0 0 10px;
  font-size: 19px;
}
.section-lede {
  margin: 0 0 28px;
  max-width: 720px;
  color: var(--ink-soft);
}
.h3-list {
  margin-top: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.muted { color: var(--muted); }
.center { text-align: center; margin-top: 26px; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.card p { margin: 0; color: var(--ink-soft); font-size: 16px; }

/* Two column */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
}
.modules, .plain {
  margin: 0;
  padding-left: 0;
  list-style: none;
  counter-reset: mod;
}
.modules li {
  counter-increment: mod;
  position: relative;
  padding: 9px 0 9px 40px;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
  color: var(--ink-soft);
}
.modules li::before {
  content: counter(mod);
  position: absolute;
  left: 0;
  top: 9px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.plain li {
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
  color: var(--ink-soft);
}
.plain li strong { color: var(--ink); }

/* Panels */
.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  background: var(--paper);
}
.panel h3 { font-size: 17px; }
.panel ul { margin: 0; padding-left: 20px; }
.panel li { margin-bottom: 7px; color: var(--ink-soft); font-size: 16px; }
.panel.ok { border-left: 4px solid var(--accent); }
.panel.no { border-left: 4px solid var(--danger); }

/* Shots */
.shots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.shots img {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
}

/* Offer */
.offer {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.tag {
  display: inline-block;
  margin: 0 0 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  padding: 5px 11px;
  border-radius: 999px;
}
.price { margin: 0 0 6px; }
.price .now { font-size: 36px; font-weight: 700; letter-spacing: -0.02em; }
.price .was {
  font-size: 18px;
  color: var(--muted);
  text-decoration: line-through;
  margin-left: 8px;
}
.offer-main > .muted { margin: 0 0 18px; font-size: 15px; }

.offer-buy {
  border-left: 1px solid var(--line);
  padding-left: 28px;
}
.qr-box { text-align: center; margin-bottom: 18px; }
.qr-ph {
  width: 190px;
  height: 190px;
  margin: 0 auto 12px;
  border: 2px dashed #b9c0c9;
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(45deg, #fafbfc, #fafbfc 10px, #f2f4f6 10px, #f2f4f6 20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}
.qr-ph small { font-weight: 400; font-size: 12px; }
.qr-note { margin: 0; font-size: 14px; color: var(--ink-soft); }

.steps {
  margin: 0 0 12px;
  padding-left: 20px;
  font-size: 15px;
  color: var(--ink-soft);
}
.steps li { margin-bottom: 6px; }

/* FAQ */
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 17px;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "+";
  display: inline-block;
  width: 20px;
  color: var(--accent);
  font-weight: 700;
}
.faq details[open] summary::before { content: "–"; }
.faq p {
  margin: 10px 0 0 20px;
  color: var(--ink-soft);
  font-size: 16px;
}

/* Policy */
.policy {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
}
.policy p { margin: 0 0 12px; }
.policy p:last-child { margin-bottom: 0; }
.policy ul { margin: 0 0 14px; padding-left: 20px; }
.policy li { margin-bottom: 8px; }

/* Contact */
.contact { text-align: center; }
.contact p { margin: 0 auto 10px; max-width: 620px; }
.placeholder-line {
  display: inline-block;
  margin-top: 6px;
  padding: 10px 16px;
  border: 1px dashed #b9c0c9;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
}

/* Footer */
.foot {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  font-size: 14px;
}
.foot p { margin: 0 0 6px; }

/* Responsive */
@media (max-width: 860px) {
  body { font-size: 16px; }
  h1 { font-size: 32px; }
  h2 { font-size: 25px; }
  .hero { padding: 36px 0 28px; }
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-art { order: -1; max-width: 300px; }
  .cards { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; gap: 30px; }
  .shots { grid-template-columns: 1fr; }
  .offer { grid-template-columns: 1fr; padding: 22px; }
  .offer-buy { border-left: 0; border-top: 1px solid var(--line); padding-left: 0; padding-top: 22px; }
  .band, .section { padding: 40px 0; }
}

@media print {
  .nav, .hero-actions, .foot { display: none; }
  body { font-size: 12pt; }
  .band { background: #fff; }
}