:root {
  --bg: #0d1117;
  --bg-alt: #131a24;
  --card: #161d29;
  --card-border: #232c3a;
  --text: #e6e9ef;
  --text-dim: #97a2b4;
  --accent: #ff7a30;
  --accent-dark: #e8621c;
  --good: #2ecc71;
  --bad: #ff5a5a;
  --radius: 10px;
  --maxw: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

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

.accent { color: var(--accent); }

/* HEADER */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13,17,23,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--card-border);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  flex-wrap: wrap;
}
.header__brand { display: flex; flex-direction: column; }
.header__logo { font-size: 20px; font-weight: 800; letter-spacing: -0.02em; }
.header__descriptor { font-size: 12px; color: var(--text-dim); }
.header__contacts { display: flex; gap: 18px; }
.header__contact { color: var(--text-dim); text-decoration: none; font-size: 14px; white-space: nowrap; }
.header__contact:hover { color: var(--accent); }
.header__burger { display: none; background: none; border: none; color: var(--text); font-size: 24px; cursor: pointer; }

/* BUTTONS */
.btn {
  display: inline-block;
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn--primary {
  background: var(--accent);
  color: #1a1206;
  padding: 14px 28px;
  font-size: 16px;
  box-shadow: 0 8px 24px -8px rgba(255,122,48,0.6);
}
.btn--primary:hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn--lg { padding: 18px 36px; font-size: 18px; }
.btn--block { width: 100%; padding: 16px; font-size: 16px; }
.btn--header {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  padding: 10px 18px;
  font-size: 14px;
}
.btn--header:hover { background: var(--accent); color: #1a1206; }

/* HERO */
.hero { padding: 88px 0 64px; text-align: center; background: radial-gradient(ellipse at top, var(--bg-alt) 0%, var(--bg) 60%); }
.hero__inner { max-width: 840px; }
.hero__pretitle { color: var(--accent); font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; font-size: 13px; margin-bottom: 18px; }
.hero__title { font-size: 44px; line-height: 1.15; margin: 0 0 24px; font-weight: 800; letter-spacing: -0.02em; }
.hero__subtitle { font-size: 18px; color: var(--text-dim); margin-bottom: 36px; }
.hero__note { margin-top: 16px; font-size: 14px; color: var(--text-dim); font-style: italic; }

/* SECTIONS */
.section { padding: 80px 0; border-top: 1px solid var(--card-border); }
.section__title { font-size: 32px; font-weight: 800; text-align: center; margin: 0 0 20px; letter-spacing: -0.01em; }
.section__lead { text-align: center; max-width: 760px; margin: 0 auto 48px; color: var(--text-dim); font-size: 17px; }

/* CARDS */
.cards { display: grid; gap: 24px; }
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
}
.card--bad { border-top: 3px solid var(--bad); }
.card--good { border-top: 3px solid var(--good); background: linear-gradient(180deg, rgba(46,204,113,0.08), var(--card)); }
.card__icon { font-size: 22px; font-weight: 900; margin-bottom: 12px; }
.card--bad .card__icon { color: var(--bad); }
.card--good .card__icon { color: var(--good); }
.card__title { margin: 0 0 10px; font-size: 19px; }
.card__text { margin: 0; color: var(--text-dim); font-size: 15px; }

/* STEPS */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step { padding: 28px; background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius); }
.step__num { font-size: 34px; font-weight: 900; color: var(--accent); opacity: 0.5; margin-bottom: 8px; }
.step__title { font-size: 19px; margin: 0 0 12px; }
.step__text { color: var(--text-dim); font-size: 15px; margin: 0; }

/* TCO TABLE */
.tco-table-wrap { overflow-x: auto; }
.tco-table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius); overflow: hidden; }
.tco-table th, .tco-table td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--card-border); font-size: 15px; }
.tco-table th { background: var(--bg-alt); color: var(--text-dim); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.03em; }
.tco-table tr:last-child td { border-bottom: none; }
.tco-table__win { color: var(--good); font-weight: 700; }

/* BULLETS */
.bullets { list-style: none; padding: 0; max-width: 760px; margin: 0 auto; }
.bullets li {
  position: relative;
  padding: 12px 0 12px 32px;
  border-bottom: 1px solid var(--card-border);
  color: var(--text-dim);
}
.bullets li:last-child { border-bottom: none; }
.bullets li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--good);
  font-weight: 900;
}
.lead .bullets, .lead .bullets li { max-width: none; }

/* LEAD FORM */
.lead__inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: start; }
.form {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form__field { display: flex; flex-direction: column; gap: 6px; }
.form__field label { font-size: 13px; color: var(--text-dim); }
.form__field input, .form__field select {
  background: var(--bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
}
.form__field input:focus, .form__field select:focus { outline: none; border-color: var(--accent); }
.form__status { text-align: center; font-size: 14px; min-height: 20px; margin: 0; }
.form__status--ok { color: var(--good); }
.form__status--err { color: var(--bad); }

/* FOOTER */
.footer { border-top: 1px solid var(--card-border); padding: 32px 0; text-align: center; color: var(--text-dim); font-size: 13px; }
.footer a { color: var(--text-dim); }
.footer p { margin: 6px 0; }

/* RESPONSIVE */
@media (max-width: 900px) {
  .cards--3, .steps { grid-template-columns: 1fr; }
  .lead__inner { grid-template-columns: 1fr; }
  .header__contacts { display: none; }
  .header__burger { display: block; }
  .hero__title { font-size: 32px; }
}