:root {
  --bg: #ffffff;
  --bg-gray: #f4f5f7;
  --bg-dark: #101318;
  --text: #14171c;
  --text-soft: #565d68;
  --muted: #8a919c;
  --accent: #ff5a1f;
  --accent-dark: #e14a12;
  --border: #e3e6ea;
  --radius: 14px;
  --container: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  font-size: 17px;
}

a { color: inherit; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header__inner { display: flex; align-items: center; gap: 24px; padding: 14px 24px; }
.logo { font-weight: 800; font-size: 20px; letter-spacing: -.02em; text-decoration: none; }
.logo span { color: var(--accent); }
.logo--light { color: #fff; }
.nav { display: flex; gap: 20px; margin-left: auto; }
.nav a { text-decoration: none; color: var(--text-soft); font-size: 15px; }
.nav a:hover { color: var(--text); }

/* Buttons */
.btn {
  display: inline-block; padding: 13px 22px; border-radius: 10px;
  font-size: 16px; font-weight: 600; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: .15s ease; text-align: center;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dark); }
.btn--ghost { border-color: rgba(255,255,255,.35); color: #fff; }
.btn--ghost:hover { border-color: #fff; }
.btn--sm { padding: 9px 16px; font-size: 14px; }

/* Hero */
.hero { background: var(--bg-dark); color: #fff; padding: 72px 0 56px; }
.hero__inner { max-width: 900px; }
.hero h1 { font-size: clamp(30px, 4.2vw, 52px); line-height: 1.12; margin: 0 0 20px; letter-spacing: -.02em; }
.hero__sub { font-size: clamp(17px, 2vw, 20px); color: #c9cfd8; margin: 0 0 28px; max-width: 720px; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 28px; }
.hero__usp { display: flex; flex-wrap: wrap; gap: 10px 22px; color: #e8ebef; font-weight: 600; font-size: 15px; }
.hero__usp span::before { content: "•"; color: var(--accent); margin-right: 8px; }
.hero__note { color: #ffb596; font-weight: 600; margin: 14px 0 0; }

/* Sections */
.section { padding: 64px 0; }
.section--gray { background: var(--bg-gray); }
.section--dark { background: var(--bg-dark); color: #fff; }
h2 { font-size: clamp(24px, 3vw, 34px); margin: 0 0 32px; letter-spacing: -.02em; }
h3 { font-size: 18px; margin: 0 0 10px; }
.section__note { color: #b9c0c9; font-size: 15px; margin: 24px 0 0; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.step__num {
  display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center;
  border-radius: 9px; background: var(--accent); color: #fff; font-weight: 700; margin-bottom: 14px;
}
.step p { margin: 0; color: var(--text-soft); }

/* Catalog */
.catalog { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.catalog__group { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.catalog__group ul { margin: 0; padding-left: 20px; color: var(--text-soft); }
.catalog__group li { margin: 6px 0; }
.catalog__materials { margin: 24px 0 0; color: var(--text-soft); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card p { margin: 0; color: var(--text-soft); }

/* Two columns / panels */
.twocol { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.panel { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.panel--accent { border-color: #ffcab4; background: #fff7f3; }
.list { margin: 0; padding-left: 20px; color: var(--text-soft); }
.list li { margin: 8px 0; }
.muted { color: var(--muted); font-size: 15px; }

/* Badges */
.badges { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.badge { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius); padding: 20px; }
.badge strong { display: block; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: #9aa3ae; margin-bottom: 6px; }
.badge span { font-size: 20px; font-weight: 700; }

/* Trust */
.trust { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 14px 28px; }
.trust li { padding-left: 26px; position: relative; color: var(--text-soft); }
.trust li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* Form */
.lead { display: grid; grid-template-columns: 1fr 1.15fr; gap: 36px; align-items: start; }
.lead__intro p { color: var(--text-soft); }
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field--full { grid-column: 1 / -1; }
label { font-size: 14px; font-weight: 600; }
input, textarea, select {
  font: inherit; padding: 11px 12px; border: 1px solid var(--border); border-radius: 9px;
  background: #fff; color: var(--text); width: 100%;
}
input:focus, textarea:focus, select:focus { outline: 2px solid #ffc4ad; border-color: var(--accent); }
.hint { font-size: 13px; color: var(--muted); }
.checkbox { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--text-soft); }
.checkbox input { width: auto; margin-top: 3px; }
.form__msg { grid-column: 1 / -1; margin: 0; font-size: 15px; min-height: 22px; }
.form__msg.is-ok { color: #147d3c; }
.form__msg.is-err { color: #c02424; }

/* FAQ */
details { border-bottom: 1px solid var(--border); padding: 16px 0; }
summary { cursor: pointer; font-weight: 600; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; color: var(--accent); font-weight: 700; }
details[open] summary::after { content: "–"; }
details p { margin: 12px 0 0; color: var(--text-soft); }

/* Footer */
.footer { background: var(--bg-dark); color: #cfd5dd; padding: 44px 0; }
.footer__inner { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer a { color: #fff; }
.footer p { margin: 6px 0; }

/* Responsive */
@media (max-width: 920px) {
  .nav { display: none; }
  .steps, .cards, .catalog, .twocol, .badges, .trust { grid-template-columns: 1fr; }
  .lead { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .form { grid-template-columns: 1fr; }
  .header__inner { gap: 12px; }
  .hero { padding: 48px 0 40px; }
  .section { padding: 48px 0; }
}