/* FloorFlow — публичная страница (лендинг с описанием функций).
   Тема в стиле приложения: dark-first, aurora-градиенты, стекло. */

:root {
  --bg: #0b0f1a;
  --bg-soft: #101527;
  --text: #e8ecf8;
  --muted: #97a1bd;
  --accent: #7c5cff;
  --accent-2: #3ddc97;
  --card: rgba(255, 255, 255, 0.055);
  --card-border: rgba(255, 255, 255, 0.1);
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(124, 92, 255, 0.22), transparent 60%),
    radial-gradient(900px 500px at 90% 10%, rgba(61, 220, 151, 0.14), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.accent { color: var(--accent-2); }

/* Шапка */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(11, 15, 26, 0.75);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.4px;
  color: var(--text);
}

.nav { display: flex; gap: 18px; align-items: center; }

.nav-link {
  color: var(--muted);
  font-size: 15px;
}

.nav-link:hover { color: var(--text); text-decoration: none; }
.nav-link-accent { color: var(--accent-2); font-weight: 600; }

/* Герой */
.hero { padding: 72px 0 40px; }

.hero-content { max-width: 720px; }

.hero-title {
  margin: 0 0 8px;
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 850;
  letter-spacing: -1.5px;
}

.hero-subtitle {
  margin: 0 0 12px;
  font-size: clamp(18px, 3vw, 24px);
  color: var(--text);
}

.hero-description {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 17px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.hero-version {
  width: 100%;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

/* Кнопки */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #5b8cff);
  color: #fff;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
}

.btn-secondary {
  background: var(--card);
  border-color: var(--card-border);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  border-color: var(--card-border);
  color: var(--text);
}

.btn-danger {
  background: rgba(255, 82, 82, 0.14);
  border-color: rgba(255, 82, 82, 0.5);
  color: #ff8a8a;
}

.btn-small { padding: 7px 14px; font-size: 13px; }

.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* Возможности */
.section { padding: 40px 0 72px; }

.section-title {
  margin: 0 0 24px;
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.5px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  backdrop-filter: blur(10px);
}

.feature-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.feature-description {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

/* Подвал */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding: 22px 0;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner p { margin: 0; }

@media (max-width: 560px) {
  .hero { padding-top: 48px; }
  .nav { gap: 12px; }
}