:root {
    --bg: #0b1220;
    --surface: #111a2c;
    --surface-alt: #16233a;
    --text: #e6edf7;
    --muted: #b4c1d8;
    --line: rgba(255, 255, 255, 0.12);
    --accent: #7bc4ff;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
    --radius: 18px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    color: var(--text);
    background: radial-gradient(circle at 20% -20%, #203352, var(--bg) 45%);
}

.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
a { color: inherit; text-decoration: none; }

.topbar { position: sticky; top: 0; z-index: 30; backdrop-filter: blur(8px); background: rgba(11, 18, 32, 0.82); border-bottom: 1px solid var(--line); }
.topbar__inner { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand__mark { font-size: 22px; color: var(--accent); }
.brand small { display: block; color: var(--muted); }
.nav { display: flex; gap: 12px; justify-content: center; }
.nav__link { padding: 10px 12px; border-radius: 10px; color: var(--muted); }
.nav__link.is-active, .nav__link:hover { background: rgba(255,255,255,.08); color: var(--text); }
.topbar__actions { display: flex; gap: 10px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--line); border-radius: 12px; padding: 10px 16px; cursor: pointer; }
.btn--ghost { background: transparent; color: var(--text); }
.btn--light { background: var(--accent); color: #08101d; border-color: transparent; font-weight: 600; }

.page-head, .section { padding: 56px 0; }
.section--alt { background: rgba(255,255,255,.03); border-block: 1px solid var(--line); }
.section__head { margin-bottom: 22px; }
.section__badge { color: var(--accent); font-weight: 600; font-size: 14px; }
.cards-grid { display: grid; gap: 14px; }
.cards-grid--2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.cards-grid--3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.cards-grid--4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: 20px; box-shadow: var(--shadow); }
.card--glass { background: linear-gradient(150deg, rgba(255,255,255,.09), rgba(255,255,255,.02)); }
.cards-stack { display: grid; gap: 12px; }

.hero { padding: 68px 0 20px; }
.brief-form, .modal__form { display: grid; gap: 12px; }
.form-grid { display: grid; gap: 10px; grid-template-columns: repeat(2, minmax(0,1fr)); }
label span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 14px; }
input, textarea { width: 100%; border-radius: 12px; border: 1px solid var(--line); background: rgba(0,0,0,.2); color: var(--text); padding: 10px 12px; }
.brief-form__footer { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.brief-form__footer small { color: var(--muted); }

.contacts-grid { display: grid; gap: 14px; grid-template-columns: 340px 1fr; }
.cta-banner { margin-top: 20px; border: 1px solid var(--line); background: var(--surface-alt); border-radius: var(--radius); padding: 20px; display: flex; justify-content: space-between; gap: 14px; align-items: center; }
.footer { border-top: 1px solid var(--line); background: rgba(0,0,0,.22); }
.footer__grid { padding: 40px 0 24px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 20px; }
.footer__cards { display: grid; gap: 10px; }
.footer-card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.footer__bottom { padding: 18px 0 26px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 10px; color: var(--muted); }
.footer__links { display: flex; gap: 14px; }

.menu-toggle { display: none; }
.modal-open { overflow: hidden; }
.modal[hidden] { display: none; }
.modal { position: fixed; inset: 0; z-index: 100; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.6); }
.modal__dialog { position: relative; width: min(640px, calc(100% - 20px)); margin: 6vh auto 0; border-radius: 22px; border: 1px solid var(--line); background: #101521; box-shadow: var(--shadow); padding: 16px; }
.modal__header { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.modal__footer { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.icon-btn { width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--line); background: rgba(255,255,255,.04); color: var(--text); cursor: pointer; }

.card, .btn, .nav__link, input, textarea { transition: all .18s ease; }
.card:hover { transform: translateY(-2px); background: rgba(255,255,255,.06); }

@media (max-width: 1120px) {
    .nav { display: none; }
    .menu-toggle { display: inline-grid; place-items: center; }
    .topbar__inner { grid-template-columns: auto auto 1fr; }
    .topbar__actions { justify-self: end; }
    .nav.is-open { display: grid; position: absolute; top: 72px; left: 16px; right: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 10px; }
    .cards-grid--4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (max-width: 860px) {
    .topbar__actions .btn--ghost { display: none; }
    .cards-grid--3, .cards-grid--2, .cards-grid--4, .contacts-grid, .footer__grid { grid-template-columns: 1fr; }
    .cta-banner, .footer__bottom, .brief-form__footer, .modal__footer { flex-direction: column; align-items: flex-start; }
    .form-grid { grid-template-columns: 1fr; }
}