:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1b1d29;
  --muted: #5b6075;
  --line: #e3e5ee;
  --blue: #2f3bf5;
  --blue-soft: rgba(47, 59, 245, 0.08);
  --red: #e8213c;
  --red-soft: rgba(232, 33, 60, 0.08);
  --shadow: 0 1px 2px rgba(20, 22, 40, 0.04), 0 8px 24px rgba(20, 22, 40, 0.06);
  --radius: 14px;
  --plate: transparent;
}

/* Тёмная тема: по системе, если человек не выбрал сам (data-theme на <html>) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11131b;
    --surface: #1a1d28;
    --text: #e9eaf2;
    --muted: #9ea3b8;
    --line: #2a2e3d;
    --blue: #7b84ff;
    --blue-soft: rgba(123, 132, 255, 0.12);
    --red: #ff5a6e;
    --red-soft: rgba(255, 90, 110, 0.12);
    --shadow: none;
    --plate: #eef0f8;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #11131b;
  --surface: #1a1d28;
  --text: #e9eaf2;
  --muted: #9ea3b8;
  --line: #2a2e3d;
  --blue: #7b84ff;
  --blue-soft: rgba(123, 132, 255, 0.12);
  --red: #ff5a6e;
  --red-soft: rgba(255, 90, 110, 0.12);
  --shadow: none;
  --plate: #eef0f8;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* Шапка */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 600; }
.brand img { height: 38px; width: auto; }
.nav { display: flex; gap: 22px; align-items: center; }
.nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px;
  background: var(--blue); color: #fff !important; text-decoration: none; font-weight: 600;
  border: 1px solid transparent; transition: transform .15s ease, filter .15s ease;
}
.btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--text) !important; border-color: var(--line); }
.nav .btn { padding: 8px 16px; font-size: 15px; }

/* Первый экран */
.hero { padding: 84px 0 64px; }
.hero .wrap { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: center; }
.eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: .04em; text-transform: uppercase;
  color: var(--red); background: var(--red-soft); padding: 4px 10px; border-radius: 99px; font-weight: 600;
}
h1 { font-size: clamp(32px, 5vw, 50px); line-height: 1.12; margin: 18px 0 18px; letter-spacing: -0.02em; }
h1 em { font-style: normal; color: var(--blue); }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 30px; max-width: 40em; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-art {
  background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow);
  padding: 34px; display: grid; place-items: center;
}
.hero-art img { width: 100%; max-width: 300px; height: auto; }
.hero-art ul { list-style: none; margin: 26px 0 0; padding: 0; width: 100%; display: grid; gap: 10px; }
.hero-art li { display: flex; justify-content: space-between; gap: 12px; font-size: 14px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 10px; }
.hero-art li b { color: var(--text); font-weight: 600; }

/* Разделы */
section { padding: 64px 0; }
section.alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: clamp(26px, 3.4vw, 34px); line-height: 1.2; margin: 0 0 12px; letter-spacing: -0.01em; }
.sub { color: var(--muted); margin: 0 0 36px; max-width: 46em; font-size: 17px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
section.alt .card { background: var(--bg); box-shadow: none; }
.card h3 { margin: 14px 0 8px; font-size: 18px; line-height: 1.3; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.icon {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  background: var(--blue-soft); color: var(--blue);
}
.icon.red { background: var(--red-soft); color: var(--red); }
.icon svg { width: 22px; height: 22px; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; padding-top: 44px; }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; top: 0; left: 0; width: 32px; height: 32px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; font-size: 15px;
  background: var(--blue); color: #fff;
}
.step h3 { margin: 0 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

.two { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.checks li { padding-left: 30px; position: relative; }
.checks li::before {
  content: ""; position: absolute; left: 0; top: 5px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--blue-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232f3bf5' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center / 12px no-repeat;
}
.checks b { font-weight: 600; }

.cta {
  background: linear-gradient(135deg, var(--blue), #6a2cf0 60%, var(--red));
  color: #fff; border-radius: 22px; padding: 44px; display: flex; align-items: center;
  justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.cta h2 { color: #fff; margin: 0 0 6px; }
.cta p { margin: 0; opacity: .9; max-width: 36em; }
.cta .btn { background: #fff; color: #1b1d29 !important; }

.note {
  border-left: 3px solid var(--red); background: var(--red-soft); border-radius: 8px;
  padding: 16px 18px; color: var(--text); font-size: 15px;
}

/* Контакты */
.contact { padding: 72px 0 96px; }
.contact-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow);
  padding: 40px; max-width: 720px;
}
.mail {
  display: inline-flex; align-items: center; gap: 12px; font-size: clamp(20px, 3.4vw, 28px); font-weight: 600;
  color: var(--blue); text-decoration: none; word-break: break-all; margin: 8px 0 24px;
}
.mail:hover { text-decoration: underline; }
.copy {
  font: inherit; font-size: 14px; cursor: pointer; padding: 6px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--bg); color: var(--muted);
}
.copy:hover { color: var(--text); }

footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
footer a { color: var(--muted); }

@media (max-width: 900px) {
  .hero { padding: 48px 0 40px; }
  .hero .wrap, .two { grid-template-columns: 1fr; gap: 32px; }
  .grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .nav a:not(.btn) { display: none; }
  .nav { gap: 10px; }
  .grid, .steps { grid-template-columns: 1fr; }
  section { padding: 48px 0; }
  .cta, .contact-card { padding: 28px 22px; }
  .hero-art { padding: 24px; }
  .hero-art img { max-width: 210px; }
}

/* В логотипе тёмная «T» — в тёмной теме кладём под него светлую подложку */
.brand img { background: var(--plate); border-radius: 8px; padding: 3px 6px; }
.hero-art img { background: var(--plate); border-radius: 16px; padding: 14px 18px; }

/* Переключатель темы */
.theme-toggle {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface); color: var(--muted); cursor: pointer;
  display: grid; place-items: center; padding: 0;
}
.theme-toggle:hover { color: var(--text); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: none; }
}