/* =============================================
   DENTALLEARN - STYLES
   Design tokens extracted from DentalLearn.pen
   ============================================= */

/* -----------------------------------------
   CSS VARIABLES (Design Tokens)
   ----------------------------------------- */
:root {
  /* Colors - Primary */
  --color-primary: #0EA5E9;
  --color-primary-light: #DBEAFE;
  --color-primary-lighter: #EFF6FF;

  /* Colors - Text */
  --color-text-dark: #0F172A;
  --color-text-secondary: #64748B;
  --color-text-muted: #94A3B8;

  /* Colors - Background */
  --color-bg-light: #F8FAFC;
  --color-bg-white: #FFFFFF;

  /* Colors - Border */
  --color-border: #E2E8F0;

  /* Colors - Status */
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font Sizes */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 30px;
  --text-4xl: 36px;

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 100px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
}

/* -----------------------------------------
   RESET & BASE
   ----------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-dark);
  background-color: var(--color-bg-white);
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* -----------------------------------------
   LAYOUT UTILITIES
   ----------------------------------------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-text-dark);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* -----------------------------------------
   BUTTONS
   ----------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-family);
  font-weight: var(--font-medium);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
}

.btn-block {
  width: 100%;
}

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

.btn-primary:hover {
  background-color: #0284C7;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--color-bg-white);
  color: var(--color-text-dark);
  border: 1px solid var(--color-border);
}

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

/* -----------------------------------------
   NAVIGATION
   ----------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
}

.logo-text {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text-dark);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a:not(.btn) {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

/* -----------------------------------------
   HERO SECTION
   ----------------------------------------- */
.hero {
  padding: calc(72px + var(--space-12)) 0 var(--space-12);
  background: linear-gradient(to bottom, var(--color-bg-light), var(--color-bg-white));
  text-align: center;
}

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

.hero-title {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--color-text-dark);
  margin-bottom: var(--space-6);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-bottom: var(--space-12);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* -----------------------------------------
   FEATURES SECTION
   ----------------------------------------- */
.features {
  padding: var(--space-12) 0;
  background-color: var(--color-bg-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.feature-card {
  padding: var(--space-8);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-primary-lighter);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.feature-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-3);
}

.feature-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* -----------------------------------------
   DEMO SECTION
   ----------------------------------------- */
.demo {
  padding: var(--space-12) 0;
  background-color: var(--color-bg-light);
}

.view-toggle {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-family);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.toggle-btn.active {
  background-color: var(--color-primary-lighter);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.demo-container {
  max-width: 900px;
  margin: 0 auto;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* Progress Summary */
.progress-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.progress-info h3 {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.progress-info p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.progress-bar-container {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 200px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar.small {
  height: 6px;
}

.progress-fill {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.progress-percent {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
}

/* Training Views */
.training-view {
  display: none;
  padding: var(--space-6);
}

.training-view.active {
  display: block;
}

/* Card View */
.training-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.training-card {
  padding: var(--space-5);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.training-card:hover {
  box-shadow: var(--shadow-md);
}

.card-status {
  margin-bottom: var(--space-3);
}

.status-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-sm);
}

.status-badge.completed {
  background-color: #DCFCE7;
  color: var(--color-success);
}

.status-badge.in-progress {
  background-color: #FEF3C7;
  color: var(--color-warning);
}

.status-badge.not-started {
  background-color: var(--color-bg-light);
  color: var(--color-text-muted);
}

.card-title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.card-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.card-progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.card-progress span {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
}

/* List View */
.training-list {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.list-header,
.list-item {
  display: grid;
  grid-template-columns: 2fr 1fr 120px 100px;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  align-items: center;
}

.list-header {
  background-color: var(--color-bg-light);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.list-item {
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.list-item:hover {
  background-color: var(--color-bg-light);
}

.col-course {
  font-weight: var(--font-medium);
}

.col-category {
  color: var(--color-text-secondary);
}

/* -----------------------------------------
   PRICING SECTION
   ----------------------------------------- */
.pricing {
  padding: var(--space-12) 0;
  background-color: var(--color-bg-white);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.pricing-card {
  position: relative;
  padding: var(--space-8);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.pricing-card.featured {
  border-color: var(--color-primary);
  border-width: 2px;
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
}

.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-4);
  background-color: var(--color-primary);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
}

.pricing-tier {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
}

.pricing-price {
  margin-bottom: var(--space-2);
}

.pricing-price .price {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--color-text-dark);
}

.pricing-price .period {
  font-size: var(--text-base);
  color: var(--color-text-muted);
}

.pricing-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.pricing-features {
  text-align: left;
  margin-bottom: var(--space-6);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.pricing-features li::before {
  content: "✓";
  color: var(--color-success);
  font-weight: var(--font-bold);
}

/* -----------------------------------------
   FOOTER
   ----------------------------------------- */
.footer {
  padding: var(--space-12) 0 var(--space-6);
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.footer-brand {
  max-width: 250px;
}

.footer-tagline {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-12);
}

.footer-column h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
}

.footer-column a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-6);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* -----------------------------------------
   RESPONSIVE
   ----------------------------------------- */
@media (max-width: 768px) {
  .nav-links a:not(.btn) {
    display: none;
  }

  .hero-title {
    font-size: var(--text-3xl);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-6);
  }

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

  .pricing-card.featured {
    transform: none;
  }

  .training-cards {
    grid-template-columns: 1fr;
  }

  .list-header,
  .list-item {
    grid-template-columns: 1fr 80px;
  }

  .col-category,
  .col-progress {
    display: none;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-8);
  }

  .footer-links {
    flex-wrap: wrap;
    gap: var(--space-6);
  }

  .progress-summary {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .progress-bar-container {
    width: 100%;
  }
}

/* -----------------------------------------
   SCROLL ANIMATIONS
   ----------------------------------------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Elements with data-animate start hidden */
[data-animate] {
  opacity: 0;
}

/* When visible, animate in */
[data-animate].animate-visible {
  animation: fadeInUp 0.6s ease forwards;
}

/* Staggered delays based on data-delay attribute */
[data-animate][data-delay="100"].animate-visible {
  animation-delay: 100ms;
}

[data-animate][data-delay="200"].animate-visible {
  animation-delay: 200ms;
}

[data-animate][data-delay="300"].animate-visible {
  animation-delay: 300ms;
}

/* -----------------------------------------
   MODAL
   ----------------------------------------- */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 440px;
  max-height: 90vh;
  overflow-y: auto;
  margin: var(--space-4);
  padding: var(--space-8);
  background-color: var(--color-bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-bg-light);
  color: var(--color-text-dark);
}

.modal-header {
  margin-bottom: var(--space-6);
}

.modal-header h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-2);
}

.modal-header p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Form Styles */
.modal-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-dark);
}

.form-group input,
.form-group select {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-family);
  font-size: var(--text-base);
  color: var(--color-text-dark);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input::placeholder {
  color: var(--color-text-muted);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.form-disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--space-2);
}

/* Success State */
.form-success {
  text-align: center;
  padding: var(--space-6) 0;
}

.success-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  margin-bottom: var(--space-4);
  background-color: #DCFCE7;
  color: var(--color-success);
  border-radius: 50%;
}

.form-success h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.form-success p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

/* Disable body scroll when modal is open */
body.modal-open {
  overflow: hidden;
}