:root {
  --bg: #0b0b0b;
  --panel: #151515;
  --panel-alt: #1d1d1d;
  --white: #fff;
  --text: #f4f4f4;
  --muted: #aaa;
  --line: rgba(255,255,255,.15);
  --wrap: 1120px;
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.65 Arial, Helvetica, sans-serif; }
img { display: block; max-width: 100%; }
a { color: var(--white); text-underline-offset: 3px; }
h1, h2, h3 { margin: 0 0 .55em; color: var(--text); line-height: 1.13; }
h1 { max-width: 14ch; font-size: clamp(2.45rem, 5.6vw, 5rem); letter-spacing: -.055em; }
h2 { font-size: clamp(1.85rem, 3.5vw, 3rem); letter-spacing: -.03em; }
h3 { font-size: 1.08rem; }
p { max-width: 68ch; margin: 0 0 1em; color: var(--muted); }
.wrap { width: min(100%, var(--wrap)); margin-inline: auto; padding-inline: 28px; }
.narrow { max-width: 900px; }
.section-label { margin-bottom: .65rem; color: var(--white); font-size: .75rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }

.site-head { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line); background: rgba(11,11,11,.94); backdrop-filter: blur(14px); }
.site-head__row { display: grid; grid-template-columns: 42px 1fr 42px; align-items: center; gap: 22px; min-height: 80px; }
.site-head__logo { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 8px; object-fit: contain; }
.site-head__center { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-width: 0; }
.site-head__mark { flex: none; color: var(--white); font-weight: 800; }
.site-head__nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px 22px; }
.site-head__nav a { color: var(--muted); font-size: .84rem; text-decoration: none; transition: color .2s ease; }
.site-head__nav a:hover, .site-head__nav a:focus-visible { color: var(--white); }

.hero { padding: clamp(70px, 10vw, 128px) 0 80px; border-bottom: 1px solid var(--line); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr); align-items: end; gap: 42px 68px; }
.hero__kicker { color: var(--white); font-size: .76rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.hero__copy p { font-size: 1.04rem; }
.hero__specs { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; overflow: hidden; margin: 8px 0 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--line); }
.hero__specs div { padding: 20px 22px; background: var(--panel); }
.hero__specs dt { margin-bottom: 5px; color: var(--muted); font-size: .72rem; }
.hero__specs dd { margin: 0; color: var(--white); font-weight: 800; }

.intro { padding: 80px 0 0; border-bottom: 1px solid var(--line); background: var(--panel); }
.intro__grid { display: grid; grid-template-columns: minmax(0, .78fr) minmax(420px, 1.22fr); gap: 54px; }
.toc { align-self: end; padding: 30px; border: 1px solid var(--line); border-bottom: 0; border-radius: var(--radius) var(--radius) 0 0; background: var(--bg); }
.toc__title { margin: 0 0 16px; color: var(--muted); font-size: .78rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.toc__list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 0 24px; margin: 0; padding: 0; list-style: none; }
.toc__list li { padding: 12px 0; border-top: 1px solid var(--line); }
.toc__list a { color: var(--text); font-size: .9rem; font-weight: 700; text-decoration: none; }

.section-block { padding: 82px 0; border-bottom: 1px solid var(--line); }
.section-block--alt { background: var(--panel); }
.table-scroll { max-width: 100%; margin: 30px 0 24px; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; min-width: 720px; border-collapse: collapse; background: var(--panel); }
th, td { padding: 18px 20px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
thead th { background: var(--white); color: #080808; font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; }
tbody th { color: var(--white); font-size: .95rem; }
tbody td { color: var(--muted); }
tbody tr:last-child > * { border-bottom: 0; }

.welcome__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(330px, .82fr); gap: 54px; align-items: center; }
.formula { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); }
.formula span { display: block; margin-bottom: 10px; color: var(--muted); font-size: .78rem; text-transform: uppercase; }
.formula strong { display: block; margin-bottom: 18px; color: var(--white); font-size: clamp(1.6rem, 3vw, 2.35rem); line-height: 1.15; }
.formula p { margin: 0; }

.regular__grid { display: grid; grid-template-columns: minmax(240px, .65fr) minmax(0, 1.35fr); gap: 54px; align-items: start; }
.regular__cards { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; }
.regular__cards article { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); }
.regular__cards span { display: block; margin-bottom: 14px; color: var(--white); font-weight: 800; }
.regular__cards p { margin: 0; }

.checklist-section { padding: 82px 0; border-bottom: 1px solid var(--line); background: var(--white); color: #0b0b0b; }
.checklist-section h2, .checklist-section .section-label { color: #0b0b0b; }
.checklist-section p { color: #4f4f4f; }
.checklist-section__grid { display: grid; grid-template-columns: minmax(0,.75fr) minmax(0,1.25fr); gap: 60px; }
.checklist { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 32px; margin: 0; padding: 0; list-style: none; counter-reset: checks; }
.checklist li { position: relative; padding: 14px 0 14px 40px; border-top: 1px solid #ccc; color: #202020; }
.checklist li::before { counter-increment: checks; content: counter(checks, decimal-leading-zero); position: absolute; left: 0; color: #777; font-size: .72rem; font-weight: 800; }

.faq { padding: 82px 0; background: var(--panel-alt); }
.faq__list { margin-top: 28px; }
.faq__item { padding: 20px 0; border-top: 1px solid var(--line); }
.faq__item:last-child { border-bottom: 1px solid var(--line); }
.faq__item summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; color: var(--white); font-weight: 800; cursor: pointer; list-style: none; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; flex: none; color: var(--white); font-size: 1.4rem; }
.faq__item[open] summary::after { content: "−"; }
.faq__item p { margin: 12px 0 0; }

.site-foot { padding-top: 58px; background: var(--panel); }
.site-foot__grid { display: grid; grid-template-columns: 1.25fr 1fr auto; gap: 42px; align-items: start; padding-bottom: 40px; }
.site-foot__col h2 { font-size: 1.35rem; }
.site-foot__col h3 { font-size: 1rem; }
.site-foot__logos { display: grid; grid-template-columns: repeat(2,52px); gap: 10px; }
.site-foot__logos img { width: 52px; height: 52px; padding: 6px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); object-fit: contain; }
.site-foot__legal { padding-block: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }

@media (max-width: 900px) {
  .site-head__row { grid-template-columns: 42px 1fr; }
  .site-head__row > .site-head__logo:last-child { display: none; }
  .site-head__center { align-items: flex-start; flex-direction: column; gap: 8px; padding-block: 14px; }
  .site-head__nav { justify-content: flex-start; }
  .hero__grid, .intro__grid, .welcome__grid, .regular__grid, .checklist-section__grid { grid-template-columns: 1fr; }
  .toc { border-bottom: 1px solid var(--line); border-radius: var(--radius); }
  .site-foot__grid { grid-template-columns: 1fr auto; }
  .site-foot__col:first-child { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .wrap { padding-inline: 20px; }
  .site-head { position: static; }
  .site-head__row { grid-template-columns: 42px 1fr; gap: 14px; }
  .site-head__nav { gap: 6px 14px; }
  .site-head__nav a { font-size: .78rem; }
  .hero { padding: 58px 0 62px; }
  .hero__specs, .toc__list, .regular__cards, .checklist { grid-template-columns: 1fr; }
  .intro, .section-block, .checklist-section, .faq { padding-top: 62px; padding-bottom: 62px; }
  .intro { padding-bottom: 62px; }
  .toc { padding: 22px; }
  .site-foot__grid { grid-template-columns: 1fr; }
  .site-foot__col:first-child { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}