:root {
  --primary-bg: #FF723A;
  --button-bg: #FF9C4D;
  --text-color: #75584B;
  --container-bg: #F5E8D2;
  --error-color: #2C9A4B;
  --border-radius: 8px;
  --transition: all 0.3s ease;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(45deg, #FF723A, #FF9C4D, #FF723A, #FF9C4D);
  background-size: 400% 400%;
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  animation: gradientFlow 15s ease infinite;
  position: relative;
  overflow: hidden;
}

@keyframes gradientFlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Звёздочки */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(rgba(255, 255, 255, 0.8) 10%, transparent 10%),
    radial-gradient(rgba(255, 255, 255, 0.6) 10%, transparent 10%);
  background-size: 200px 200px;
  background-position: 0 0, 100px 100px;
  animation: twinkle 4s infinite ease-in-out;
  pointer-events: none;
  z-index: 0;
}

@keyframes twinkle {
  0%, 100% {
    opacity: 0.6;
  }
  50% {
    opacity: 0.9;
  }
}

.header {
  width: 100%;
  max-width: 500px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background-color: var(--container-bg);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
}

.header .nav-btn {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1rem;
  cursor: pointer;
  padding: 8px 16px;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.header .nav-btn:hover {
  background-color: rgba(255, 156, 77, 0.2);
}

.header .title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-color);
}

.container {
  max-width: 500px;
  width: 100%;
  background: var(--container-bg);
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: var(--shadow);
  padding: 30px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.product-container {
  position: relative;
  margin: 30px auto;
  width: 200px;
  height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.product-placeholder {
  position: relative;
  z-index: 2;
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--text-color);
  background-color: var(--container-bg);
  padding: 20px;
  border-radius: var(--border-radius);
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

.input-group {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 20px;
}

input[type="text"] {
  flex: 1;
  padding: 14px;
  border: 2px solid #e0e0e0;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--button-bg);
  box-shadow: 0 0 0 3px rgba(255, 156, 77, 0.25);
}

button {
  background-color: var(--button-bg);
  color: white;
  border: none;
  padding: 14px 20px;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  width: auto;
  min-width: 150px;
}

button:hover {
  background-color: #ff8a2f;
}

#wordError {
  color: var(--error-color);
  font-size: 0.9rem;
  margin-top: 10px;
  min-height: 20px;
  text-align: left;
}

@media (max-width: 600px) {
  .header {
    flex-direction: column;
    gap: 10px;
    padding: 10px;
  }

  .header .title {
    font-size: 1.2rem;
  }

  .product-container {
    width: 150px;
    height: 150px;
  }

  .product-placeholder {
    font-size: 1.2rem;
  }

  .input-group {
    flex-direction: column;
  }

  button {
    width: 100%;
    min-width: auto;
  }
}