:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --brand: #0d9488;
  --brand-dark: #0f766e;
  --accent: #0369a1;
  --grant-red: #e84e43;
  --grant-purple: #6b2fa0;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --max: 1080px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

/* --- Grant attribution (ТЗ п. 3.2б, договор п. 7.2) --- */
.grant-strip {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.grant-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.25rem 2rem;
  margin-bottom: 0.75rem;
}

.grant-logos img {
  display: block;
  object-fit: contain;
}

.grant-logos .logo-fasie {
  height: 56px;
  width: auto;
  display: block;
}

.grant-strip .logo-fasie {
  background: #000;
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
}

.site-footer .logo-fasie {
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
}

.grant-logos .logo-putp {
  height: 56px;
  width: auto;
  max-width: min(100%, 280px);
}

.grant-text {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
  max-width: 52rem;
  margin-inline: auto;
}

/* --- Header / nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
}

.brand-link {
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.brand-link:hover {
  color: var(--brand-dark);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav a:hover {
  color: var(--brand-dark);
}

/* --- Hero --- */
.hero {
  padding: 3.5rem 0 3rem;
  background: linear-gradient(160deg, #ecfeff 0%, #f8fafc 55%, #fff 100%);
}

.hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 800px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 1rem;
}

.hero .lead {
  font-size: 1.1rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.tag {
  display: inline-block;
  background: #ccfbf1;
  color: var(--brand-dark);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.hero-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.hero-card h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
}

.hero-card li {
  margin-bottom: 0.35rem;
}

/* --- Sections --- */
section {
  padding: 3rem 0;
}

section:nth-of-type(even) {
  background: var(--surface);
}

.section-title {
  margin: 0 0 0.35rem;
  font-size: clamp(1.5rem, 3vw, 1.9rem);
}

.section-sub {
  margin: 0 0 1.75rem;
  color: var(--muted);
  max-width: 42rem;
}

.cards {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .cards.cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .cards.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

section:nth-of-type(even) .card {
  background: var(--surface);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p,
.card ul {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card ul {
  padding-left: 1.1rem;
}

/* --- Specs table --- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.spec-table th,
.spec-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.spec-table th {
  width: 38%;
  background: #f1f5f9;
  font-weight: 600;
}

.spec-table tr:last-child td,
.spec-table tr:last-child th {
  border-bottom: none;
}

/* --- Contact --- */
.contact-box {
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.contact-box a {
  color: #fff;
  font-weight: 600;
}

.contact-box p {
  margin: 0.5rem 0 0;
  opacity: 0.92;
}

/* --- Footer --- */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 2rem 0;
  font-size: 0.9rem;
}

.site-footer .grant-logos {
  margin-bottom: 1rem;
}

.site-footer .grant-text {
  color: #94a3b8;
}

.footer-meta {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid #334155;
  font-size: 0.82rem;
  color: #94a3b8;
}