/* Цвета Material You */
:root {
  --primary: #7c4dff;       /* Фиолетовый акцент */
  --on-primary: #ffffff;
  --background: #f5f5f5;
  --surface: #ffffff;
  --on-surface: #333333;
  --shadow: rgba(0, 0, 0, 0.1);
}

/* Сброс */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Roboto', sans-serif;
}

body {
  background-color: var(--background);
  color: var(--on-surface);
  line-height: 1.5;
}

/* Хедер */
header {
  background-color: var(--primary);
  color: var(--on-primary);
  padding: 1rem;
  box-shadow: 0 4px 6px var(--shadow);
  border-radius: 0; /* На мобилках лучше без скругления краёв */
  width: 100%;
  margin: 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
}

header h1 {
  font-size: 1.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-buttons {
  display: flex;
  gap: 0.75rem;
}

.nav-btn {
  color: var(--on-primary);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 12px;
  transition: background-color 0.3s;
  font-size: 0.95rem;
}

.nav-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

/* Основной блок */
main {
  max-width: 800px;
  margin: 1.5rem auto;
  padding: 1.5rem;
  background-color: var(--surface);
  border-radius: 16px;
  box-shadow: 0 4px 12px var(--shadow);
}

main h2 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

main p {
  line-height: 1.6;
  margin-bottom: 1rem;
  font-size: 1rem;
}

ul {
  margin-top: 0.5rem;
  margin-left: 1.25rem;
  list-style-type: disc;
  font-size: 1rem;
}

/* Кнопка */
.primary-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.25rem;
  background-color: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s;
  width: auto;
  text-align: center;
}

.primary-btn:hover {
  background-color: #651fff;
}

/* Футер */
footer {
  text-align: center;
  margin: 2rem 0 1rem;
  font-size: 0.85rem;
  color: #777;
  padding: 0 1rem;
}

/* Попап (Paywall) */
.popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.popup--open {
  opacity: 1;
  visibility: visible;
}

.popup-content {
  background-color: var(--surface);
  padding: 1.5rem;
  border-radius: 16px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 4px 12px var(--shadow);
  position: relative;
  transform: scale(0.95) translateY(10px);
  opacity: 0;
  transition: 
    transform 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275),
    opacity 0.35s ease;
}

.popup--open .popup-content {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.popup-content h2 {
  color: var(--primary);
  margin-bottom: 1rem;
  text-align: center;
  font-size: 1.3rem;
}

.popup-content form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.popup-content label {
  font-weight: 500;
  font-size: 1rem;
}

.popup-content input {
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 12px;
  font-size: 1rem;
}

.popup-content input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 2px rgba(124, 77, 255, 0.2);
}

/* Кнопка закрытия */
.close-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 1.25rem;
  cursor: pointer;
  color: #777;
  transition: color 0.2s;
}

.close-btn:hover {
  color: #000;
}

/* Адаптация под маленькие экраны */
@media (max-width: 480px) {
  header {
    padding: 0.875rem 1rem;
  }

  .header-container {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  header h1 {
    font-size: 1.35rem;
  }

  main {
    margin: 1rem;
    padding: 1.25rem;
  }

  .popup-content {
    padding: 1.25rem;
  }

  .popup-content input,
  .popup-content button {
    font-size: 1rem;
    padding: 0.75rem;
  }

  .nav-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.9rem;
  }
}