:root {
  --red: #d92d20;
  --red-dark: #b01e14;
  --red-light: #ff5a4e;
  --dark: #0f172a;
  --gray: #64748b;
  --light: #f8fafc;
  --white: #ffffff;
  --green: #16a34a;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.10);
  --shadow-lg: 0 20px 50px rgba(2, 6, 23, 0.16);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1140px; margin: 0 auto; padding: 0 22px; }
img { max-width: 100%; }
h1, h2, h3 { line-height: 1.15; font-weight: 800; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); text-align: center; }
h3 { font-size: 1.15rem; }
.section-sub { text-align: center; color: var(--gray); max-width: 620px; margin: 10px auto 40px; font-size: 1.05rem; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #eef0f4;
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo img { border-radius: 10px; }
.logo-text { font-weight: 800; font-size: 1.25rem; color: var(--dark); letter-spacing: -0.02em; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { color: var(--gray); text-decoration: none; font-weight: 600; font-size: 0.95rem; transition: color .2s; }
.nav a:hover { color: var(--red); }
.btn-nav {
  background: var(--red); color: #fff !important; padding: 10px 20px;
  border-radius: 999px; font-weight: 700;
  transition: transform .15s, box-shadow .15s;
}
.btn-nav:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(217,45,32,.35); }

/* Hero */
.hero {
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(255,90,78,.28), transparent 60%),
    radial-gradient(900px 420px at 5% 0%, rgba(217,45,32,.20), transparent 55%),
    linear-gradient(180deg, #fff 0%, #fff5f4 100%);
  padding: 72px 0 84px;
  text-align: center;
}
.hero-badge {
  display: inline-block; background: #fff; border: 1px solid #ffd7d2;
  color: var(--red); font-weight: 700; font-size: .85rem;
  padding: 8px 16px; border-radius: 999px; margin-bottom: 22px;
  box-shadow: 0 4px 14px rgba(217,45,32,.10);
}
.hero h1 { max-width: 820px; margin: 0 auto 18px; }
.hl { color: var(--red); }
.hero-sub { max-width: 640px; margin: 0 auto 38px; color: var(--gray); font-size: 1.15rem; }

.dl-card {
  background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-width: 560px; margin: 0 auto; padding: 26px 28px;
  border: 1px solid #f1f2f6;
}
.dl-info { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; text-align: left; }
.dl-icon { width: 46px; height: 46px; border-radius: 10px; }
.dl-meta { display: flex; flex-direction: column; }
.dl-name { font-weight: 700; font-size: .98rem; }
.dl-size { color: var(--gray); font-size: .85rem; }
.btn-dl {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  background: linear-gradient(180deg, var(--red-light), var(--red));
  color: #fff; text-decoration: none; font-weight: 800; font-size: 1.15rem;
  padding: 17px 24px; border-radius: 12px;
  box-shadow: 0 12px 26px rgba(217,45,32,.38);
  transition: transform .15s, box-shadow .15s;
}
.btn-dl:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(217,45,32,.46); }
.btn-dl:active { transform: translateY(0); }
.dl-password {
  margin-top: 16px; display: flex; align-items: center; justify-content: center; gap: 10px;
  background: #fff7ed; border: 1px dashed #fdba74; border-radius: 10px;
  padding: 10px 14px;
}
.pw-label { color: #9a3412; font-weight: 600; font-size: .9rem; }
.pw-code {
  font-family: 'Cascadia Code', 'Courier New', monospace;
  font-weight: 800; font-size: 1.25rem; color: #c2410c;
  letter-spacing: 2px; background: #fff; padding: 3px 12px; border-radius: 7px;
  border: 1px solid #fed7aa;
}
.trust-row { display: flex; justify-content: center; gap: 44px; margin-top: 44px; flex-wrap: wrap; }
.trust-item { display: flex; flex-direction: column; align-items: center; }
.trust-item strong { font-size: 1.5rem; color: var(--red); font-weight: 800; }
.trust-item span { color: var(--gray); font-size: .88rem; }

/* Features */
.features { padding: 84px 0; background: var(--light); }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card {
  background: #fff; border-radius: var(--radius); padding: 28px 22px;
  box-shadow: var(--shadow); border: 1px solid #eef0f4;
  transition: transform .2s, box-shadow .2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 2rem; margin-bottom: 14px; }
.feature-card h3 { margin-bottom: 8px; }
.feature-card p { color: var(--gray); font-size: .93rem; }

/* How-to */
.howto { padding: 84px 0; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step {
  background: #fff; border: 1px solid #eef0f4; border-radius: var(--radius);
  padding: 30px 26px; position: relative; box-shadow: var(--shadow);
}
.step-num {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--red); color: #fff; font-weight: 800; font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
  box-shadow: 0 8px 18px rgba(217,45,32,.35);
}
.step h3 { margin-bottom: 8px; }
.step p { color: var(--gray); font-size: .95rem; }

/* Products */
.products { padding: 84px 0; background: var(--light); }
.products-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; max-width: 860px; margin: 0 auto; }
.product-card {
  background: #fff; border-radius: var(--radius); padding: 30px 28px;
  box-shadow: var(--shadow); border: 1px solid #eef0f4;
}
.product-card h3 { color: var(--red); margin-bottom: 14px; font-size: 1.25rem; }
.product-card ul { list-style: none; }
.product-card li { padding: 7px 0; color: var(--dark); font-size: .97rem; border-bottom: 1px solid #f1f2f6; }
.product-card li:last-child { border-bottom: none; }
.product-card li::before { content: "✓"; color: var(--green); font-weight: 800; margin-right: 9px; }

/* FAQ */
.faq { padding: 84px 0; }
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
  background: #fff; border: 1px solid #eef0f4; border-radius: 12px;
  margin-bottom: 12px; overflow: hidden; box-shadow: 0 4px 14px rgba(2,6,23,.05);
}
.faq-item summary {
  padding: 18px 22px; font-weight: 700; cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 1.02rem; transition: color .2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 1.4rem; color: var(--red); font-weight: 800;
  transition: transform .2s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { color: var(--red); }
.faq-item p { padding: 0 22px 20px; color: var(--gray); font-size: .96rem; }

/* CTA final */
.cta-final {
  background: linear-gradient(135deg, var(--red-dark), var(--red) 60%, var(--red-light));
  padding: 84px 0; text-align: center; color: #fff;
}
.cta-inner h2 { color: #fff; margin-bottom: 14px; }
.cta-inner p { max-width: 560px; margin: 0 auto 32px; color: rgba(255,255,255,.92); font-size: 1.08rem; }
.btn-dl-lg {
  display: inline-flex; background: #fff; color: var(--red);
  font-size: 1.25rem; padding: 19px 38px;
  box-shadow: 0 16px 40px rgba(0,0,0,.28);
}
.btn-dl-lg:hover { box-shadow: 0 20px 48px rgba(0,0,0,.34); }
.dl-password-cta {
  display: inline-flex; margin-top: 20px; background: rgba(255,255,255,.14);
  border: 1px dashed rgba(255,255,255,.5);
}
.dl-password-cta .pw-label { color: #fff; }
.dl-password-cta .pw-code { background: rgba(255,255,255,.2); color: #fff; border-color: rgba(255,255,255,.4); }

/* Footer */
.footer { background: var(--dark); color: #cbd5e1; padding: 54px 0 30px; }
.footer-inner { text-align: center; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 10px; font-weight: 800; font-size: 1.2rem; color: #fff; margin-bottom: 12px; }
.footer-brand img { border-radius: 8px; }
.footer-desc { max-width: 480px; margin: 0 auto 22px; font-size: .95rem; color: #94a3b8; }
.footer-links { display: flex; justify-content: center; gap: 26px; margin-bottom: 22px; }
.footer-links a { color: #cbd5e1; text-decoration: none; font-size: .92rem; font-weight: 600; }
.footer-links a:hover { color: var(--red-light); }
.footer-copy { font-size: .85rem; color: #64748b; }

/* Responsive */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .nav a:not(.btn-nav) { display: none; }
  .trust-row { gap: 26px; }
}
@media (max-width: 560px) {
  .features-grid { grid-template-columns: 1fr; }
  .hero { padding: 54px 0 64px; }
  .dl-card { padding: 20px; }
  .btn-dl { font-size: 1.02rem; padding: 15px 18px; }
}