:root {
  --bg: #0b1020;
  --bg-elev: #121a2f;
  --text: #ebeffa;
  --muted: #a6b0c8;
  --gold: #d4ac43;
  --gold-soft: #f2d98c;
  --line: #25304e;
  --card: #111931;
  --ok: #43c26a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top right, #172140 0%, var(--bg) 45%);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  background: rgba(9, 14, 30, 0.82);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--gold);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--gold-soft);
}

.brand-text {
  font-weight: 650;
  letter-spacing: 0.2px;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.top-nav a {
  color: var(--muted);
  font-size: 0.96rem;
}

.top-nav a:hover {
  color: var(--text);
}

.hero {
  padding: 5.5rem 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 1.5rem;
}

.eyebrow {
  text-transform: uppercase;
  color: var(--gold-soft);
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  margin: 0 0 0.7rem;
  font-weight: 600;
}

h1,
h2 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}

.lead {
  margin: 1rem 0;
  color: #d7dff5;
  max-width: 64ch;
}

.hero-cta {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1.2rem;
}

.hero-stats {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.hero-stats li {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-stats span {
  color: var(--text);
  font-weight: 700;
  margin-right: 0.35rem;
}

.hero-card {
  background: linear-gradient(160deg, #182443, #101830);
  border: 1px solid #30406f;
  border-radius: 18px;
  padding: 1.25rem;
}

.hero-card h3 {
  margin: 0;
  color: var(--gold-soft);
  font-size: 0.95rem;
}

.hero-card-title {
  margin: 0.5rem 0 0;
  font-size: 1.3rem;
  font-weight: 700;
}

.hero-card-price {
  color: var(--gold);
  margin: 0.4rem 0 0;
  font-size: 1.35rem;
  font-weight: 800;
}

.hero-card-note {
  color: var(--muted);
  font-size: 0.95rem;
}

.section {
  padding: 4rem 0;
}

.section-alt {
  background: rgba(14, 21, 42, 0.78);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  max-width: 76ch;
  margin-bottom: 1.3rem;
}

.section-head p {
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.book-card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.book-head {
  padding: 0.95rem;
  border-bottom: 1px solid #1d2948;
}

.book-head h3 {
  margin: 0;
  font-size: 1.04rem;
}

.book-sub {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.book-body {
  padding: 0.95rem;
  display: grid;
  gap: 0.6rem;
  flex: 1;
}

.track-tags {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.74rem;
  border: 1px solid #34436f;
  color: #b9c5ea;
  border-radius: 999px;
  padding: 0.18rem 0.52rem;
}

.price {
  font-size: 1.05rem;
  font-weight: 700;
}

.price.paid {
  color: var(--gold);
}

.price.free {
  color: var(--ok);
}

.book-footer {
  padding: 0.95rem;
  border-top: 1px solid #1d2948;
  display: grid;
  gap: 0.5rem;
}

.btn {
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 0.64rem 0.95rem;
  font-weight: 640;
  cursor: pointer;
}

.btn-gold {
  background: linear-gradient(120deg, #c99f3b, #e3be65);
  color: #111726;
}

.btn-dark {
  border-color: #31406c;
  background: #182240;
  color: #d7e1fb;
}

.btn-outline {
  border-color: #3b4f85;
}

.btn.full {
  width: 100%;
}

.payments-strip {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.pay-chip {
  border: 1px solid #31406f;
  border-radius: 999px;
  padding: 0.44rem 0.75rem;
  color: #d9e3ff;
  background: #121b35;
}

.model-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.model-grid article {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.95rem;
  background: #0f1630;
}

.model-grid h3 {
  margin: 0;
  color: var(--gold-soft);
}

.upload-steps {
  display: grid;
  gap: 0.35rem;
  margin: 0.6rem 0;
  color: #d8e0f8;
}

code {
  background: #111a35;
  border: 1px solid #253662;
  padding: 0.09rem 0.35rem;
  border-radius: 6px;
  color: #f7dd93;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.3rem 0;
  background: #0a0f22;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.muted {
  color: var(--muted);
  margin: 0;
}

.checkout-modal {
  border: none;
  border-radius: 14px;
  padding: 0;
  width: min(470px, 92vw);
  background: transparent;
}

.checkout-modal::backdrop {
  background: rgba(4, 7, 18, 0.72);
}

.checkout-card {
  background: #101934;
  border: 1px solid #32406f;
  border-radius: 14px;
  padding: 1.1rem;
  position: relative;
  color: var(--text);
}

.checkout-card h3 {
  margin-top: 0;
}

.checkout-card select {
  width: 100%;
  margin-top: 0.35rem;
  margin-bottom: 0.75rem;
  border-radius: 10px;
  border: 1px solid #31406d;
  background: #0d1430;
  color: #e8eeff;
  padding: 0.56rem;
}

.close-btn {
  position: absolute;
  top: 0.4rem;
  right: 0.6rem;
  background: none;
  border: none;
  color: #9eabce;
  font-size: 1.5rem;
  cursor: pointer;
}

.success-banner {
  margin-top: 0.55rem;
  border: 1px solid #3a9f5c;
  background: #10261a;
  color: #b2ecc3;
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  font-size: 0.92rem;
}

.detail-panel {
  margin-top: 1rem;
  border: 1px solid #2d3d6b;
  border-radius: 12px;
  background: #0f1731;
  padding: 1rem;
}

.detail-panel-head h3 {
  margin: 0;
}

.detail-outcomes {
  margin: 0.6rem 0 0;
  padding-left: 1.2rem;
  color: #d8e0f8;
  display: grid;
  gap: 0.25rem;
}

@media (max-width: 940px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .top-nav {
    justify-content: flex-end;
  }
}

@media (max-width: 700px) {
  .site-header {
    position: static;
  }

  .nav-wrap {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.8rem 0;
  }

  .top-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .hero {
    padding-top: 2.6rem;
  }
}