:root {
  --ink: #17254b;
  --ink-soft: #5c6880;
  --paper: #f7f8fc;
  --blue-paper: #edf1fb;
  --line: #d7dfef;
  --cobalt: #2855c7;
  --cobalt-dark: #1d3f96;
  --vermilion: #e5573f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", system-ui, sans-serif;
}
a { color: inherit; }
.nav, main, footer { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; text-decoration: none; }
.brand img { width: 31px; height: 31px; border-radius: 8px; }
.nav-link { color: var(--ink-soft); font-size: 14px; font-weight: 650; text-decoration: none; }
.nav-link:hover { color: var(--cobalt); }
.hero {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  min-height: 690px;
  gap: 70px;
  padding: 70px 0 90px;
}
.eyebrow {
  margin: 0 0 20px;
  color: var(--cobalt);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}
h1, h2 { font-family: Georgia, "Times New Roman", serif; letter-spacing: -.045em; }
h1 { margin: 0; font-size: clamp(55px, 6.3vw, 88px); line-height: .94; }
h1 em { color: var(--vermilion); font-weight: inherit; }
.lede { max-width: 555px; margin: 30px 0 0; color: var(--ink-soft); font-size: 19px; line-height: 1.6; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 49px;
  padding: 0 21px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible,
.nav-link:focus-visible,
.brand:focus-visible {
  outline: 3px solid rgba(40, 85, 199, .3);
  outline-offset: 4px;
}
.primary { color: white; background: var(--cobalt); box-shadow: 0 10px 24px rgba(40,85,199,.2); }
.primary:hover { background: var(--cobalt-dark); }
.secondary { border-color: var(--line); background: white; }
.privacy-note { margin: 20px 0 0; color: var(--ink-soft); font-size: 12px; }
.privacy-note span { color: #2b9871; margin-right: 6px; }
.product-stage {
  position: relative;
  min-height: 570px;
  border-radius: 44px 44px 44px 12px;
  background:
    linear-gradient(rgba(40,85,199,.06) 1px, transparent 1px) 0 0 / 100% 31px,
    var(--blue-paper);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.notebook-line { position: absolute; background: rgba(229,87,63,.25); }
.line-one { width: 1px; height: 100%; top: 0; right: 72px; }
.line-two { height: 1px; width: 100%; left: 0; bottom: 74px; }
.popup-preview {
  position: relative;
  z-index: 1;
  width: 360px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255,255,255,.95);
  box-shadow: 0 26px 70px rgba(23,37,75,.18);
  transform: rotate(-2deg);
}
.popup-preview header, .preview-meta { display: flex; justify-content: space-between; align-items: center; }
.popup-preview header { color: var(--ink-soft); font-size: 9px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.mini-brand { display: inline-flex; align-items: center; gap: 7px; color: var(--ink); font-size: 11px; letter-spacing: 0; text-transform: none; }
.mini-brand b { display: grid; place-items: center; width: 23px; height: 23px; border-radius: 7px; color: white; background: var(--cobalt); font: 700 13px Georgia, serif; }
.preview-card { margin-top: 16px; padding: 19px; border: 1px solid var(--line); border-radius: 18px 18px 18px 6px; }
.preview-meta { color: var(--ink-soft); font-size: 8px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.preview-card h2 { margin: 20px 0 4px; font-size: 43px; line-height: 1; }
.pronunciation { margin: 0 0 16px !important; color: var(--cobalt) !important; font-size: 10px !important; font-weight: 750; letter-spacing: .05em; }
.preview-card p, .preview-card blockquote { color: var(--ink-soft); font-size: 12px; line-height: 1.5; }
.preview-card blockquote { margin: 16px 0 0; padding-left: 12px; border-left: 3px solid var(--vermilion); font-family: Georgia, serif; font-style: italic; }
.preview-progress { display: flex; align-items: center; gap: 12px; margin-top: 12px; padding: 11px 13px; border-radius: 13px; background: var(--blue-paper); }
.preview-seal { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; color: white; background: var(--vermilion); font-size: 20px; }
.preview-progress b, .preview-progress small { display: block; }
.preview-progress b { font-size: 11px; }
.preview-progress small { margin-top: 3px; color: var(--ink-soft); font-size: 9px; }
.success-toast {
  position: absolute;
  z-index: 2;
  right: 22px;
  top: 90px;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 190px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
  box-shadow: 0 14px 35px rgba(23,37,75,.18);
  transform: rotate(3deg);
}
.success-toast > span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; color: white; background: var(--vermilion); }
.success-toast p, .success-toast small, .success-toast b { margin: 0; display: block; }
.success-toast small { color: var(--ink-soft); font-size: 8px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.success-toast b { margin-top: 2px; font: 700 15px Georgia, serif; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--line); }
.principles article { padding: 42px 42px 42px 0; }
.principles article + article { padding-left: 42px; border-left: 1px solid var(--line); }
.principles span { color: var(--vermilion); font: 700 11px Georgia, serif; }
.principles h3 { margin: 17px 0 9px; font: 700 21px Georgia, serif; }
.principles p { margin: 0; color: var(--ink-soft); font-size: 14px; line-height: 1.55; }
.how { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; padding: 120px 0; }
.how h2, .install h2 { margin: 0; font-size: clamp(40px, 5vw, 66px); line-height: 1; }
.how ol { margin: 0; padding: 0; list-style: none; counter-reset: steps; }
.how li { position: relative; padding: 4px 0 28px 56px; border-bottom: 1px solid var(--line); counter-increment: steps; }
.how li + li { padding-top: 28px; }
.how li::before { content: counter(steps); position: absolute; left: 0; top: 4px; display: grid; place-items: center; width: 33px; height: 33px; border-radius: 50%; color: var(--cobalt); background: var(--blue-paper); font: 700 12px Georgia, serif; }
.how li + li::before { top: 28px; }
.how li span { font: 700 20px Georgia, serif; }
.how li p { margin: 7px 0 0; color: var(--ink-soft); font-size: 14px; line-height: 1.5; }
.install { display: grid; grid-template-columns: 1fr 1fr; gap: 85px; padding: 70px; border-radius: 34px 34px 34px 10px; color: white; background: var(--cobalt); }
.install .eyebrow { color: #bccbff; }
.install-copy > p:not(.eyebrow) { max-width: 480px; margin: 22px 0 28px; color: #dfe6ff; line-height: 1.6; }
.light { color: var(--ink); background: white; }
.install-steps { margin: 0; padding: 0; list-style: none; counter-reset: install; }
.install-steps li { position: relative; padding: 3px 0 25px 55px; counter-increment: install; border-bottom: 1px solid rgba(255,255,255,.2); }
.install-steps li + li { padding-top: 25px; }
.install-steps li::before { content: counter(install); position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid rgba(255,255,255,.35); border-radius: 50%; font: 700 12px Georgia, serif; }
.install-steps li + li::before { top: 22px; }
.install-steps b, .install-steps span { display: block; }
.install-steps b { font: 700 19px Georgia, serif; }
.install-steps span { margin-top: 6px; color: #dfe6ff; font-size: 13px; line-height: 1.45; }
code { border-radius: 4px; padding: 2px 5px; background: rgba(255,255,255,.13); }
footer { display: flex; align-items: center; justify-content: space-between; padding: 50px 0; color: var(--ink-soft); font-size: 13px; }
footer p { margin: 0; }
@media (max-width: 850px) {
  .hero, .how, .install { grid-template-columns: 1fr; }
  .hero { gap: 45px; }
  .product-stage { min-height: 530px; }
  .how { gap: 45px; }
  .install { gap: 50px; padding: 45px; }
}
@media (max-width: 620px) {
  .nav, main, footer { width: min(100% - 28px, 1160px); }
  .hero { padding-top: 45px; min-height: auto; }
  h1 { font-size: 54px; }
  .product-stage { min-height: 470px; margin-inline: -4px; }
  .popup-preview { width: min(320px, calc(100% - 30px)); transform: rotate(-1deg); }
  .success-toast { top: 55px; right: 7px; transform: scale(.88) rotate(2deg); }
  .principles { grid-template-columns: 1fr; }
  .principles article, .principles article + article { padding: 28px 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .principles article:last-child { border-bottom: 0; }
  .how { padding: 85px 0; }
  .install { padding: 34px 25px; border-radius: 24px 24px 24px 8px; }
  footer { align-items: flex-start; gap: 20px; }
}
@media (max-width: 380px) {
  .actions .button { flex: 1 1 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}