/* ==========================================================================
   ACADEMY PLATFORM - CORE DESIGN SYSTEM
   ========================================================================== */

:root {
  --bg-main: #0b0f19;
  --bg-card: #111827;
  --bg-card-hover: #1f2937;
  --border-color: #1f2937;
  --border-highlight: #374151;
  
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --brand-primary: #3b82f6;
  --brand-hover: #2563eb;
  --brand-glow: rgba(59, 130, 246, 0.15);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #ffffff;
}

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

.btn-secondary {
  background-color: transparent;
  border-color: var(--border-highlight);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--text-secondary);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* Badges */
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: var(--brand-glow);
  color: var(--brand-primary);
  border: 1px solid var(--brand-primary);
  margin-bottom: 16px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(11, 15, 25, 0.8);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--brand-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-links a:not(.btn) {
  font-size: 0.925rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-links a:not(.btn):hover {
  color: var(--text-primary);
}

/* Hero Section */
.hero {
  padding: 90px 0 70px;
  text-align: center;
}

.hero-inner {
  max-width: 780px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.15rem;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Courses Catalogue */
.courses-section {
  padding: 70px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.course-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.course-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
}

.course-thumb img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.course-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.course-title {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.course-desc {
  font-size: 0.925rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* Pricing Section */
.pricing-section {
  padding: 70px 0 100px;
}

.pricing-card {
  max-width: 520px;
  margin: 0 auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
}

.pricing-description {
  margin: 12px 0 24px;
}

.price-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 24px;
}

.price-display .currency {
  font-size: 1.5rem;
  font-weight: 600;
}

.price-display .amount {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.price-display .period {
  color: var(--text-secondary);
}

.perks-list {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.perks-list li {
  padding: 8px 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.perks-list li:last-child {
  border-bottom: none;
}

/* Auth / Account Layouts (Used in Step 1.5) */
.auth-page {
  min-height: calc(100vh - 140px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.auth-header {
  text-align: center;
  margin-bottom: 28px;
}

.auth-header h2 {
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="tel"] {
  width: 100%;
  padding: 12px 14px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-group input:focus {
  border-color: var(--brand-primary);
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 16px;
}

.checkbox-group input {
  margin-top: 4px;
}

.checkbox-group label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.auth-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.auth-footer a {
  color: var(--brand-primary);
  text-decoration: underline;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 30px 0;
  text-align: center;
  font-size: 0.875rem;
}