:root {
  --ink: #0f1f33;
  --muted: #64758c;
  --brand: #1f5fd8;
  --brand-strong: #1648aa;
  --success: #1f9a7a;
  --line: #dbe5f1;
  --surface: #ffffff;
  --shadow: 0 22px 54px rgba(18, 54, 94, 0.16);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Poppins", sans-serif;
  color: var(--ink);
  background: #f4f7fb;
}

.site-topbar {
  background: #0a182e;
  color: #ffffff;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.topbar-inner {
  width: min(100%, 1120px);
  min-height: 58px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-logo {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.site-logo img { display: block; width: auto; height: 34px; }

.hero {
  position: relative;
  min-height: min(620px, 72vh);
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #122645;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 24, 49, 0.84) 0%, rgba(8, 24, 49, 0.58) 42%, rgba(8, 24, 49, 0.18) 100%),
    linear-gradient(180deg, rgba(8, 24, 49, 0.1) 0%, rgba(8, 24, 49, 0.74) 100%),
    var(--hero-banner) center/cover no-repeat;
  transform: scale(1.01);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: clamp(30px, 7vw, 72px) 20px clamp(86px, 10vw, 118px);
  color: #ffffff;
}

.hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(2.8rem, 7vw, 5.8rem);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: 0;
}

.hero-title-subline {
  display: inline-block;
  font-size: 0.66em;
  line-height: 1.05;
  white-space: nowrap;
}

.checkout-shell {
  position: relative;
  z-index: 2;
  width: min(100%, 760px);
  margin: -92px auto 0;
  padding: 0 20px 64px;
}

.checkout-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: clamp(20px, 4vw, 36px);
}

.checkout-card h2 {
  margin: 0 0 6px;
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 700;
  color: var(--ink);
}

.checkout-card p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.55;
}

.product-kicker {
  display: inline-block;
  margin: 0 0 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
}

.price-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 14px 0 22px;
}

.price {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--ink);
}

.price-note { font-size: 0.86rem; color: var(--muted); }

.buy-btn {
  display: block;
  width: 100%;
  text-align: center;
  text-decoration: none;
  padding: 16px 22px;
  border-radius: 14px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand), var(--success));
  box-shadow: 0 14px 30px rgba(31, 95, 216, 0.28);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.buy-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 38px rgba(31, 95, 216, 0.34);
}

.secure-note {
  margin: 16px 0 0;
  font-size: 0.84rem;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 820px) {
  .hero { min-height: 62vh; }
  .hero::before {
    background:
      linear-gradient(180deg, rgba(8, 24, 49, 0.16) 0%, rgba(8, 24, 49, 0.84) 100%),
      var(--hero-banner) center/cover no-repeat;
  }
}

@media (max-width: 520px) {
  .site-logo img { height: 28px; }
  .hero { min-height: 56vh; }
  .hero-content { padding-left: 16px; padding-right: 16px; }
  .checkout-shell { margin-top: -64px; padding: 0 14px 44px; }
}