:root {
  --bg: #ffffff;
  --ink: #111217;
  --muted: #626978;
  --line: #e5e8ef;
  --soft: #f3f6fa;
  --accent: #e8512b;
  --accent-strong: #c33a1f;
  --green: #0a7f5a;
  --night: #191b21;
  --radius: 8px;
  --shadow: 0 18px 50px rgba(18, 24, 40, 0.12);
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
}

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

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

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -42px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 12px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.topbar__inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  flex: 0 0 auto;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

.nav a,
.header-action {
  padding: 9px 12px;
  border-radius: var(--radius);
}

.nav a:hover,
.header-action:hover {
  background: var(--soft);
  color: var(--ink);
}

.header-action {
  color: #fff;
  background: var(--accent);
  font-weight: 700;
}

.header-action:hover {
  background: var(--accent-strong);
  color: #fff;
}

.hero {
  padding: 54px 0 64px;
  background:
    linear-gradient(135deg, rgba(243, 246, 250, 0.96), rgba(255, 255, 255, 0.72)),
    repeating-linear-gradient(90deg, rgba(17, 18, 23, 0.04) 0 1px, transparent 1px 92px);
}

.hero__grid {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 54px;
  align-items: center;
}

.cover-panel {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.book-cover {
  width: min(320px, 100%);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.book-meta span {
  padding: 7px 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
}

.hero__content {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: 64px;
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 44px;
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 10px 0 8px;
  font-size: 20px;
  line-height: 1.2;
}

.lead {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 20px;
}

.rating-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 28px 0;
}

.rating-row div {
  min-height: 78px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.rating-row strong {
  display: block;
  font-size: 24px;
  line-height: 1;
}

.rating-row span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.purchase {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.price {
  min-width: 140px;
}

.price__label {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.price strong {
  display: block;
  font-size: 34px;
  line-height: 1;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 700;
  text-align: center;
  cursor: pointer;
}

.button--primary {
  background: var(--accent);
  color: #fff;
}

.button--primary:hover {
  background: var(--accent-strong);
}

.button--secondary {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}

.button--secondary:hover {
  border-color: var(--ink);
}

.button--light {
  background: #fff;
  color: var(--ink);
}

.bonus {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 0;
  color: var(--muted);
}

.notice {
  padding: 16px 0;
  background: #fff4f0;
  border-top: 1px solid #ffd8cc;
  border-bottom: 1px solid #ffd8cc;
  color: #6f2b1c;
  font-size: 13px;
  text-transform: uppercase;
}

.notice p {
  margin: 0;
}

.section {
  padding: 76px 0;
}

.section--soft {
  background: var(--soft);
}

.section--contrast {
  background: var(--night);
  color: #fff;
}

.two-column,
.details-layout,
.checkout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 42px;
  align-items: start;
}

.text-block p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 19px;
}

.feature-grid,
.reviews {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.feature-card,
.review-card {
  min-height: 190px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.feature-card span {
  color: var(--green);
  font-weight: 700;
}

.feature-card p,
.review-card p,
.details-summary p,
.checkout p {
  margin: 0;
  color: var(--muted);
}

.details-list {
  margin: 0;
  display: grid;
  gap: 10px;
}

.details-list div {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.details-list dt {
  color: var(--muted);
}

.details-list dd {
  margin: 0;
  font-weight: 700;
}

.sample {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.sample p:not(.eyebrow) {
  max-width: 620px;
  color: rgba(255, 255, 255, 0.72);
}

.reviews {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.review-card strong {
  display: block;
  margin-bottom: 10px;
  font-size: 24px;
}

.checkout-form {
  display: grid;
  gap: 12px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.checkout-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
}

.checkout-form input {
  min-height: 46px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
}

.checkout-form input:focus {
  outline: 2px solid rgba(232, 81, 43, 0.24);
  border-color: var(--accent);
}

.checkout-form p {
  font-size: 12px;
}

.footer {
  padding: 48px 0 28px;
  background: #101116;
  color: rgba(255, 255, 255, 0.8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr 0.75fr;
  gap: 26px;
}

.footer h2 {
  margin-bottom: 12px;
  color: #fff;
  font-size: 18px;
}

.footer p {
  margin: 8px 0 0;
  font-size: 14px;
}

.footer img {
  background: #fff;
  border-radius: var(--radius);
  padding: 5px;
}

.qr-box {
  display: grid;
  align-content: start;
  gap: 10px;
}

.cookie-note {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.56);
}

@media (max-width: 900px) {
  .topbar__inner {
    flex-wrap: wrap;
    padding: 12px 0;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .hero__grid,
  .two-column,
  .details-layout,
  .checkout {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 48px;
  }

  h2 {
    font-size: 36px;
  }

  .cover-panel {
    order: 2;
  }

  .rating-row,
  .feature-grid,
  .reviews,
  .footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sample {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 24px, 1180px);
  }

  .hero {
    padding: 34px 0 48px;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 30px;
  }

  .lead {
    font-size: 18px;
  }

  .rating-row,
  .feature-grid,
  .reviews,
  .footer__grid {
    grid-template-columns: 1fr;
  }

  .purchase {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .details-list div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .section {
    padding: 54px 0;
  }
}