:root {
  --accent: #00bfff;
  --muted: #9aa4b2;
  --bg1: #001f3f;
  --bg2: #003366;
  --tariff-bg: #0a1a2a;
  --tariff-text: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  color: var(--tariff-text);
  scroll-behavior: smooth;
  background: linear-gradient(-45deg, var(--bg1), var(--bg2), #00264d, var(--bg1));
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 40px;
  animation: slideDown .8s ease both;
}

.features-list li {
  background: rgba(255, 255, 255, 0.1); /* лёгкий голубой фон */
  border-radius: 12px;               /* скругление углов */
  padding: 10px 15px;                /* отступы внутри */
  margin-bottom: 8px;                /* расстояние между элементами */
  list-style: none;                  /* убрать стандартные маркеры */
}

@keyframes slideDown {
  from { transform: translateY(-100%); opacity: 0; }
  to { transform: none; opacity: 1; }
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo h1 { font-size: 22px; margin: 0; color: var(--accent); }
.tag { font-size: 12px; color: var(--muted); }
.navbtns { display: flex; gap: 10px; }

.btn {
  background: linear-gradient(90deg, var(--accent), #007acc);
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s, background .3s;
  color: #ffffff;
}
.btn:hover { transform: translateY(-3px) scale(1.05); box-shadow: 0 0 20px rgba(0,191,255,0.4); background: linear-gradient(90deg, #00d0ff, #0095cc); }
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid rgba(0,191,255,0.3); }
.btn.secondary:hover { background: rgba(0,191,255,0.1); }

section { padding: 80px 40px; max-width: 1100px; margin: 0 auto; }
section h2 { text-align: center; margin-bottom: 30px; font-size: 28px; animation: fadeUp .9s ease both; color: var(--accent); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }

.cards { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.card { flex: 1; min-width: 250px; padding: 20px; border-radius: 14px; background: rgba(255,255,255,0.05); transition: transform .3s, box-shadow .3s, background .6s; cursor: pointer; animation: fadeUp .8s ease both; color: #ffffff; }
.card:hover { transform: translateY(-8px) scale(1.03) rotateX(2deg) rotateY(-2deg); box-shadow: 0 20px 40px rgba(0,191,255,0.4); background: rgba(0,191,255,0.1); }
.card strong { font-size: 18px; color: var(--accent); }
.price { font-size: 20px; font-weight: bold; margin: 6px 0; color: var(--accent); }
.features { color: var(--muted); font-size: 13px; }

.tariffs { display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 20px; }
.tariff { opacity: 0; transform: translateY(20px); background: var(--tariff-bg); color: var(--tariff-text); padding: 22px; border-radius: 12px; margin-bottom: 15px; transition: transform 0.3s, background 0.3s, opacity 0.5s; }
.tariff.show { opacity: 1; transform: translateY(0); }
.tariff h3 { margin-bottom: 10px; color: var(--accent); }
.cta { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }

.legal-footer {
  padding: 20px 40px;
  font-size: 12px;
  color: #999;
  text-align: center;
  background: rgba(0,0,0,0.2);
  margin-top: 40px;
}
.legal-footer p {
  margin: 4px 0;
}

.tariff {
  padding: 22px;
  border-radius: 12px;
  background: rgba(255,255,255,0.1);
  transition: transform 0.3s, background 0.5s, box-shadow 0.3s, opacity 0.5s;
  opacity: 0;
  transform: translateY(20px);
  word-break: break-word;
}

.tariff.show {
  opacity: 1;
  transform: translateY(0);
}

.tariff:hover {
  transform: translateY(-10px) scale(1.05);
  box-shadow: 0 25px 50px rgba(0,255,234,0.5);
  background: rgba(0,255,234,0.15);
}

.specs {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
  color: #ffffff;
}

.spec {
  padding: 6px 10px;
  background: rgba(0,191,255,0.1);
  border-radius: 8px;
}

/* Адаптив для мобильных */
@media(max-width:700px){
  .tariffs {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .selection-container {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
}

footer { padding: 40px; text-align: center; background: rgba(0,0,0,0.2); color: var(--muted); animation: fadeUp 1s ease both; }
.contact-list { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }

select { outline: none; background: rgba(0,191,255,0.15); color: #ffffff; border: 1px solid rgba(0,191,255,0.5); padding: 5px 8px; border-radius: 5px; -webkit-appearance: none; -moz-appearance: none; appearance: none; transition: background 0.3s; }
select option { background: var(--tariff-bg); color: var(--tariff-text); }

@media(max-width:700px){ header { flex-direction: column; gap: 12px; padding: 12px; } }