/* CoachCraft Design System */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
  --green-dark: #0B3D2E;
  --green-mid: #1A6B4A;
  --green-light: #2ECC71;
  --green-pale: #E8F8F0;
  --orange-accent: #F5A623;
  --orange-light: #FFF3E0;
  --white: #FFFFFF;
  --gray-50: #F8FAFB;
  --gray-100: #EEF1F3;
  --gray-200: #DEE2E6;
  --gray-400: #8E99A4;
  --gray-600: #4A5568;
  --gray-900: #1A202C;
  --red-500: #E53E3E;
  --red-50: #FFF5F5;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
}

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

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
  line-height: 1.2;
}

a { color: var(--green-mid); text-decoration: none; }
a:hover { color: var(--green-dark); }

/* App Navigation */
.app-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-100);
}

.app-nav .logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--green-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-nav .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--green-dark);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green-light);
  font-size: 16px;
}

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

.app-nav .nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.app-nav .nav-link:hover {
  color: var(--green-dark);
  background: var(--green-pale);
}

.app-nav .nav-link.active {
  color: var(--green-dark);
  background: var(--green-pale);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--green-mid);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--white);
  color: var(--green-dark);
  border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
  border-color: var(--green-dark);
  color: var(--green-dark);
}

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

.btn-accent:hover {
  background: #e0941e;
  color: var(--white);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.1rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-100);
  padding: 24px;
  transition: all 0.2s;
}

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

/* Form Elements */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  color: var(--gray-900);
  transition: border-color 0.2s;
  outline: none;
}

.form-input:focus {
  border-color: var(--green-mid);
}

.form-input::placeholder {
  color: var(--gray-400);
}

/* Alert */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 16px;
  display: none;
}

.alert.show {
  display: block;
}

.alert-error {
  background: var(--red-50);
  color: var(--red-500);
  border: 1px solid #FED7D7;
}

.alert-success {
  background: var(--green-pale);
  color: var(--green-dark);
  border: 1px solid #C6F6D5;
}

/* Page Layout */
.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 32px 60px;
}

.page-container-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 100px 32px 60px;
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-100);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green-mid), var(--green-light));
  border-radius: 99px;
  transition: width 0.5s ease;
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-green {
  background: var(--green-pale);
  color: var(--green-dark);
}

.badge-orange {
  background: var(--orange-light);
  color: #C47F17;
}

.badge-gray {
  background: var(--gray-100);
  color: var(--gray-600);
}

/* Markdown Rendering */
.lesson-content h1 { font-size: 2rem; margin: 32px 0 16px; color: var(--green-dark); }
.lesson-content h2 { font-size: 1.5rem; margin: 28px 0 12px; color: var(--green-dark); }
.lesson-content h3 { font-size: 1.2rem; margin: 24px 0 8px; }
.lesson-content p { margin: 12px 0; color: var(--gray-600); line-height: 1.8; }
.lesson-content strong { color: var(--gray-900); }
.lesson-content ul, .lesson-content ol { margin: 12px 0; padding-left: 24px; color: var(--gray-600); }
.lesson-content li { margin: 6px 0; line-height: 1.7; }
.lesson-content blockquote {
  border-left: 4px solid var(--green-light);
  padding: 12px 20px;
  margin: 16px 0;
  background: var(--green-pale);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--green-dark);
}

.lesson-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.9rem;
}

.lesson-content th {
  background: var(--green-dark);
  color: var(--white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
}

.lesson-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-600);
}

.lesson-content tr:hover td {
  background: var(--gray-50);
}

/* Quiz Styles */
.quiz-question {
  background: var(--white);
  border: 2px solid var(--gray-100);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
}

.quiz-question h3 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--gray-900);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  margin: 8px 0;
  border: 2px solid var(--gray-100);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.95rem;
}

.quiz-option:hover {
  border-color: var(--green-light);
  background: var(--green-pale);
}

.quiz-option.selected {
  border-color: var(--green-mid);
  background: var(--green-pale);
}

.quiz-option.correct {
  border-color: var(--green-light);
  background: var(--green-pale);
}

.quiz-option.incorrect {
  border-color: var(--red-500);
  background: var(--red-50);
}

.quiz-option input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--green-mid);
}

/* Certificate */
.certificate-frame {
  background: var(--white);
  border: 3px solid var(--green-dark);
  border-radius: var(--radius-lg);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.certificate-frame::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--green-dark), var(--green-light), var(--orange-accent));
}

.certificate-frame h1 {
  font-size: 2.5rem;
  color: var(--green-dark);
  margin-bottom: 8px;
}

.certificate-frame h2 {
  font-size: 1.1rem;
  color: var(--gray-400);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 32px;
}

.certificate-frame .cert-name {
  font-size: 2rem;
  color: var(--green-dark);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  margin: 24px 0 8px;
}

.certificate-frame .cert-course {
  font-size: 1.2rem;
  color: var(--gray-600);
  margin-bottom: 32px;
}

.certificate-frame .cert-details {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 32px;
  font-size: 0.85rem;
  color: var(--gray-400);
}

/* Responsive */
@media (max-width: 768px) {
  .app-nav { padding: 12px 16px; }
  .page-container, .page-container-narrow { padding: 80px 16px 40px; }
  .certificate-frame { padding: 32px 20px; }
  .certificate-frame h1 { font-size: 1.8rem; }
  .certificate-frame .cert-name { font-size: 1.5rem; }
  .certificate-frame .cert-details { flex-direction: column; gap: 12px; }
}

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-50) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Utility */
.text-center { text-align: center; }
.text-sm { font-size: 0.9rem; }
.text-xs { font-size: 0.8rem; }
.text-gray { color: var(--gray-400); }
.text-green { color: var(--green-mid); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }