:root { color-scheme: dark; font-family: system-ui, sans-serif; color: #f5f4ff; background: #0c1020; --muted: #bec4da; --mint: #82eed0; --line: #33394f; }
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(ellipse at 74% 23%, #24224b 0, transparent 43%), #0c1020; }
a { color: inherit; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--mint); outline-offset: 5px; }
.wrap { width: min(1120px, calc(100% - 3rem)); margin-inline: auto; }
.nav, .footer { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.nav { padding-block: 1.25rem; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: .65rem; font-weight: 750; font-size: 1.25rem; text-decoration: none; }
.brand img { border-radius: .65rem; }
.edition, .eyebrow, figcaption { font-size: .72rem; letter-spacing: .13em; font-weight: 750; }
.edition { color: var(--muted); text-align: right; }
.eyebrow { color: var(--mint); margin: 0 0 1rem; }
.hero { display: grid; grid-template-columns: 1.12fr 1fr; align-items: center; gap: 2rem; padding-block: 4rem 3.5rem; }
h1 { font-size: clamp(2.65rem, 5.4vw, 4.6rem); letter-spacing: -.065em; line-height: 1.02; margin: 0; }
h1 span { color: #b6a8ff; }
.lead { color: var(--muted); font-size: 1.09rem; line-height: 1.65; max-width: 34rem; margin: 1.35rem 0 1.6rem; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem 1.25rem; }
.button, .secondary { font-weight: 720; text-underline-offset: .22em; }
.button { display: inline-flex; gap: .8rem; border-radius: .65rem; padding: .9rem 1.15rem; background: var(--mint); color: #101d22; text-decoration: none; }
.button:hover { background: #a1f7df; }
.secondary:hover { color: var(--mint); }
.spec { color: var(--muted); font-size: .82rem; margin-top: .85rem; }
.spec span { padding-inline: .15rem; }
.preview { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; gap: 1rem; padding: 1.2rem; border: 1px solid #474264; border-radius: 1.4rem; background: linear-gradient(145deg, #292744, #131c31); }
.phone { display: block; width: 100%; height: auto; border: 1px solid #535271; border-radius: 1rem; box-shadow: 0 12px 32px #060811a8; }
.lesson { margin-top: 1.55rem; }
figcaption { grid-column: 1 / -1; text-align: center; color: var(--muted); }
.instructions { padding: 2rem 0 2.5rem; border-top: 1px solid var(--line); }
h2 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.65rem); letter-spacing: -.04em; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 1.25rem 0; padding: 0; list-style: none; counter-reset: steps; }
.steps li { background: #161b2e; border: 1px solid var(--line); border-radius: .8rem; padding: 1rem; counter-increment: steps; }
.steps li::before { content: '0' counter(steps); color: var(--mint); font-weight: 750; font-size: .8rem; }
h3 { margin: .6rem 0 .35rem; font-size: 1.05rem; }
.steps p, details, .footer { color: var(--muted); line-height: 1.55; font-size: .88rem; }
.steps p { margin: 0; }
summary { cursor: pointer; }
code { overflow-wrap: anywhere; }
.footer { padding-block: 1.2rem 1.7rem; border-top: 1px solid var(--line); }
@media (max-width: 800px) { .hero { grid-template-columns: 1fr; padding-block: 2.8rem; } .preview { max-width: 470px; } }
@media (max-width: 530px) { .wrap { width: calc(100% - 2rem); } .steps { grid-template-columns: 1fr; } .preview { padding: .75rem; gap: .65rem; } }