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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #000B18;
  color: #e6ecf5;
  line-height: 1.6;
}

/* Шапка и меню */

.site-header {
  background: #00172D;
  border-bottom: 1px solid #00264D;
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 600;
  font-size: 1.1rem;
  color: #f0f4ff;
}

.nav a {
  margin-left: 15px;
  text-decoration: none;
  color: #c0c9ff;
  font-size: 0.95rem;
}

.nav a:hover {
  color: #66b2ff;
}

.nav .nav-login {
  font-weight: 600;
}

.nav .active {
  color: #66b2ff;
}

/* Общие контейнеры */

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 30px 20px 40px;
}

/* Главная страница */

.hero {
  text-align: center;
  margin: 40px 0 30px;
}

.hero h1 {
  font-size: 2rem;
  color: #f5f8ff;
  margin-bottom: 10px;
}

.hero p {
  color: #c3cee6;
  max-width: 520px;
  margin: 0 auto 20px;
}

.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.95rem;
}

.btn.primary {
  background: #00498D;
  color: #ffffff;
}

.btn.primary:hover {
  background: #0052A2;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.feature {
  background: #00172D;
  border-radius: 8px;
  padding: 18px 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.4);
}

.feature h2 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: #f0f4ff;
}

.feature p {
  font-size: 0.9rem;
  color: #c3cee6;
}

/* Страницы текста */

.page-block h1 {
  font-size: 1.6rem;
  margin-bottom: 15px;
  color: #f5f8ff;
}

.page-block p {
  margin-bottom: 10px;
  color: #c3cee6;
  font-size: 0.95rem;
}

/* Авторизация */

.auth-container {
  max-width: 400px;
  margin: 50px auto 40px;
  padding: 0 20px;
}

.auth-box {
  background: #00172D;
  padding: 25px 22px 28px;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.6);
}

.auth-box h2 {
  margin-bottom: 15px;
  color: #f5f8ff;
  font-size: 1.4rem;
}

.auth-note {
  font-size: 0.85rem;
  color: #c3cee6;
  margin-bottom: 15px;
}

input {
  width: 100%;
  padding: 11px;
  margin: 7px 0;
  border: 1px solid #00498D;
  border-radius: 6px;
  font-size: 0.95rem;
  background: #000B18;
  color: #f5f8ff;
}

input::placeholder {
  color: #8fa0c2;
}

input:focus {
  outline: none;
  border-color: #66b2ff;
  box-shadow: 0 0 0 1px rgba(102,178,255,0.25);
}

button {
  width: 100%;
  padding: 11px;
  background: #00498D;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  cursor: pointer;
  margin-top: 8px;
}

button:hover {
  background: #0052A2;
}

/* Ошибка входа */

.error-message {
  display: none;
  margin-top: 8px;
  font-size: 0.85rem;
  color: #ff6b6b;
}

/* Подвал */

.site-footer {
  text-align: center;
  padding: 14px 10px 18px;
  font-size: 0.8rem;
  color: #8fa0c2;
}