/* --- Modern CSS Variables --- */
:root {
  --primary-color: #2A3335;
  --primary-hover: #888c8f;
  --accent-color: #007bff;
  --bg-color: #f0f2f5;
  --card-radius: 16px;
  --input-radius: 6px;
  --shadow-light: rgba(0,0,0,0.1);
  --shadow-medium: rgba(0,0,0,0.2);
  --transition-speed: 0.3s;
  --font-main: 'Arial', sans-serif;
}

/* --- Global Styles --- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body, html {
  height: 100%;
  margin: 0;
  padding: 2% 0;
  font-family: var(--font-main);
  background: var(--bg-color) url("../images/saden_background_image.jpg") no-repeat center center fixed;
  background-size: cover;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.register-container {
  width: 100%;
  max-width: 1000px;
  padding: 3rem 2rem;
  background:  #2A3335;
  border-radius: var(--card-radius);
  box-shadow: 0 8px 20px var(--shadow-light);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin: 2rem 0;
}

.register-container .logo {
  width: 50%;
  height: auto;
  margin: 0 auto 1rem;
  display: block;
}

/* --- Form Styles --- */
form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

label {
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #fff;
}

input, select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid #ccc;
  border-radius: var(--input-radius);
  font-size: 0.95rem;
  color: #000;
  background-color: #fff;
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

input:focus, select:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0,123,255,0.15);
  outline: none;
}

/* --- Button Styles --- */
button {
  width: 100%;
  padding: 0.85rem 0;
  background-color: var(--primary-color);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: var(--input-radius);
  cursor: pointer;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
  grid-column: 1 / -1;
}

button:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

/* --- Alert Box --- */
.alert {
  grid-column: 1 / -1;
  padding: 0.75rem 1rem;
  border-radius: var(--input-radius);
  margin-bottom: 1rem;
  font-weight: 500;
  text-align: center;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Error messages in red */
.alert-error {
  background-color: #e74c3c; /* red background */
  color: white;               /* white text */
}

/* Success messages in green */
.alert-success {
  background-color: #2ecc71;  /* green background */
  color: white;
}

/* Optional: Info messages in blue */
.alert-info {
  background-color: #3498db;
  color: white;
}

/* Optional: Warning messages in orange */
.alert-warning {
  background-color: #f39c12;
  color: white;
}


/* --- Plan Card Styles --- */
.plan-selection {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.plan-options {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 1rem;
}

.plan-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  border-radius: var(--card-radius);
  width: 220px;
  min-height: 180px;
  text-align: center;
  font-weight: bold;
  cursor: pointer;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed), border var(--transition-speed);
  color: white;
  box-shadow: 0 6px 15px var(--shadow-medium);
}

.plan-card:hover {
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 10px 25px var(--shadow-medium);
}

.plan-card input[type="radio"] {
  display: none;
}

.plan-card input[type="radio"]:checked + .card-content,
.plan-card input[type="radio"]:checked ~ .card-content {
  border: 3px solid #fff;
  box-shadow: 0 0 25px rgba(255,255,255,0.8);
  transform: scale(1.05);
}

/* Card gradients */
.plan-card:nth-child(1) { background: linear-gradient(135deg, #6dd5ed, #2193b0); }
.plan-card:nth-child(2) { background: linear-gradient(135deg, #f7971e, #ffd200); }
.plan-card:nth-child(3) { background: linear-gradient(135deg, #667eea, #764ba2); }
.plan-card:nth-child(4) { background: linear-gradient(135deg, #11998e, #38ef7d); }

/* Card Content */
.card-content h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.card-content p {
  margin: 0.25rem 0;
  font-size: 0.9rem;
  font-weight: 400;
  opacity: 0.9;
}

/* --- Submit Group --- */
.submit-group {
  grid-column: 1 / -1;
  text-align: center;
}

.submit-group .login-link {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: white;
}

.submit-group .login-link a {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-speed);
}

.submit-group .login-link a:hover {
  color: var(--accent-color);
}

/* --- Responsive Plan Cards --- */
@media (max-width: 1024px) {
  form {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
  .plan-options {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .register-container {
    padding: 2rem 1rem;
  }
}

@media (max-width: 600px) {
  form {
    grid-template-columns: 1fr;
  }
  .plan-options {
    flex-direction: column;
    align-items: center;
  }
}