/* ==========================================
   BS Learning - Professional Styling
   ========================================== */

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

:root {
  --primary-color: #1a3a52;
  --secondary-color: #8b3a62;
  --accent-color: #2ecc71;
  --light-bg: #f8f9fa;
  --dark-text: #2c3e50;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--dark-text);
  background-color: #ffffff;
}

/* ==========================================
   Typography
   ========================================== */

h1, h2, h3, h4, h5, h6 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-weight: 600;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
  color: #555;
}

a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--primary-color);
}

/* ==========================================
   Header & Navigation
   ========================================== */

header {
  background: linear-gradient(135deg, var(--primary-color) 0%, #2c5aa0 100%);
  color: white;
  padding: 1rem 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo i {
  color: var(--accent-color);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

nav a {
  color: white;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav a:hover {
  color: var(--accent-color);
}

.contact-info {
  font-size: 0.9rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.contact-info a {
  color: white;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-info a:hover {
  color: var(--accent-color);
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, #2c5aa0 100%);
  color: white;
  padding: 5rem 20px;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero p {
  color: #e8e8e8;
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ==========================================
   Buttons
   ========================================== */

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 5px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  font-weight: 600;
  text-align: center;
}

.btn-primary {
  background-color: var(--accent-color);
  color: white;
}

.btn-primary:hover {
  background-color: #27ae60;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background-color: #6d2a4a;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: transparent;
  color: white;
  border: 2px solid white;
}

.btn-outline:hover {
  background-color: white;
  color: var(--primary-color);
}

/* ==========================================
   Container & Layout
   ========================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 4rem 20px;
}

.section-light {
  background-color: var(--light-bg);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: #666;
  font-size: 1.1rem;
}

/* ==========================================
   Grid & Cards
   ========================================== */

.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  border-top: 4px solid var(--secondary-color);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: 3rem;
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

.card h3 {
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.card p {
  color: #666;
  margin-bottom: 1rem;
}

.card-level {
  display: inline-block;
  background-color: var(--light-bg);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--primary-color);
  font-weight: 600;
}

/* ==========================================
   Forms
   ========================================== */

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--primary-color);
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(139, 58, 98, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

/* ==========================================
   Payment Methods
   ========================================== */

.payment-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.payment-option {
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.payment-option:hover {
  border-color: var(--secondary-color);
  background-color: var(--light-bg);
}

.payment-option input[type="radio"] {
  margin-right: 0.5rem;
}

.payment-option.selected {
  border-color: var(--secondary-color);
  background-color: rgba(139, 58, 98, 0.05);
}

.payment-icon {
  font-size: 2rem;
  color: var(--secondary-color);
  margin-bottom: 0.5rem;
}

.payment-details {
  background-color: #FFFFC1;
  border-left: 4px solid var(--secondary-color);
  padding: 1.5rem;
  border-radius: 5px;
  margin: 1.5rem 0;
  display: none;
}

.payment-details.show {
  display: block;
}

.payment-details p {
  margin-bottom: 0.5rem;
  font-weight: 600;
}

/* ==========================================
   Footer
   ========================================== */

footer {
  background: linear-gradient(135deg, var(--primary-color) 0%, #2c5aa0 100%);
  color: white;
  padding: 3rem 20px 1rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: white;
  margin-bottom: 1rem;
}

.footer-section p,
.footer-section a {
  color: #e8e8e8;
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer-section a:hover {
  color: var(--accent-color);
}

.contact-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.contact-footer i {
  color: var(--accent-color);
  width: 20px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 2rem;
  text-align: center;
  color: #e8e8e8;
}

/* ==========================================
   Trust Elements
   ========================================== */

.trust-banner {
  background-color: var(--light-bg);
  border-left: 4px solid var(--accent-color);
  padding: 1.5rem;
  border-radius: 5px;
  margin: 2rem 0;
}

.trust-banner i {
  color: var(--accent-color);
  margin-right: 0.5rem;
}

.trust-banner strong {
  color: var(--primary-color);
}

/* ==========================================
   Features Section
   ========================================== */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.feature {
  text-align: center;
}

.feature-icon {
  font-size: 3rem;
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

.feature h4 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.feature p {
  font-size: 0.95rem;
  color: #666;
}

/* ==========================================
   Platform Cards
   ========================================== */

.platform-card {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
  border-left: 4px solid var(--secondary-color);
}

.platform-card h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.platform-card p {
  color: #666;
  margin-bottom: 1rem;
}

.platform-link {
  display: inline-block;
  background-color: var(--accent-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.platform-link:hover {
  background-color: #27ae60;
  transform: translateX(5px);
}

/* ==========================================
   Alert Messages
   ========================================== */

.alert {
  padding: 1rem;
  border-radius: 5px;
  margin-bottom: 1.5rem;
  border-left: 4px solid;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
  border-color: #28a745;
}

.alert-error {
  background-color: #f8d7da;
  color: #721c24;
  border-color: #f5c6cb;
}

.alert-info {
  background-color: #d1ecf1;
  color: #0c5460;
  border-color: #bee5eb;
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .header-container {
    flex-direction: column;
    gap: 1rem;
  }

  nav ul {
    gap: 1rem;
    justify-content: center;
  }

  .contact-info {
    flex-direction: column;
    gap: 0.5rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .payment-methods {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .section {
    padding: 2rem 15px;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .hero {
    padding: 3rem 15px;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero p {
    font-size: 1rem;
  }

  nav ul {
    gap: 0.5rem;
    font-size: 0.9rem;
  }

  .card {
    padding: 1.5rem;
  }

  .payment-methods {
    grid-template-columns: 1fr;
  }

  .features {
    grid-template-columns: 1fr;
  }
}