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

:root {
  --primary: #6c63ff;
  --primary-dark: #5b54d9;
  --bg-dark: #1a1a2e;
  --bg-card: #16213e;
  --text-primary: #eaeaea;
  --text-secondary: #b0b0b0;
  --border: #2d3561;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
}

body {
  background: var(--bg-dark);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* Header */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), #ff6b9d);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

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

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--primary);
}

.user-avatar-placeholder {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.9rem;
}

.user-name {
  font-size: 0.9rem;
}

.btn-login, .btn-logout {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-block;
}

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

.btn-login:hover {
  background: var(--primary-dark);
}

.btn-logout {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

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

/* Main */
.main {
  flex: 1;
  padding: 3rem 0;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-block;
  font-weight: 500;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-back {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--primary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.btn-back:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: 4rem;
  padding: 2rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), #ff6b9d);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  text-align: center;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(108, 99, 255, 0.2);
}

.feature-emoji {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Tracks Grid */
.tracks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.track-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.track-card:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(108, 99, 255, 0.3);
  transform: translateY(-4px);
}

.track-emoji {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.track-card h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.track-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  flex: 1;
  line-height: 1.6;
}

.track-modules {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 500;
}

/* Track Detail */
.track-detail h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.modules-list {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.module-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: all 0.3s ease;
}

.module-item a {
  display: block;
  padding: 1.5rem;
  color: inherit;
  text-decoration: none;
}

.module-item:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(108, 99, 255, 0.2);
}

.module-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.module-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.module-lessons {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 500;
}

/* Module Detail */
.module-detail h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.lessons-list {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.lesson-item {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  color: inherit;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  transition: all 0.3s ease;
}

.lesson-item:hover {
  border-color: var(--primary);
  background: var(--bg-card);
  box-shadow: 0 4px 12px rgba(108, 99, 255, 0.2);
}

.lesson-item.completed {
  border-color: var(--success);
}

.lesson-icon {
  font-size: 1.5rem;
  min-width: 40px;
  text-align: center;
}

.lesson-content {
  flex: 1;
}

.lesson-content h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.lesson-duration {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.badge-completed {
  background: var(--success);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  font-size: 0.8rem;
  font-weight: 600;
}

/* Lesson Detail */
.lesson-detail h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.lesson-header {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.track-badge {
  background: var(--bg-card);
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.lesson-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
}

.video-placeholder {
  background: linear-gradient(135deg, rgba(108, 99, 255, 0.1), rgba(255, 107, 157, 0.1));
  border: 2px dashed var(--border);
  border-radius: 0.75rem;
  padding: 3rem 2rem;
  text-align: center;
  margin-bottom: 2rem;
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.video-placeholder p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.text-muted {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.lesson-materials, .lesson-homework {
  margin-bottom: 2rem;
}

.lesson-materials h2, .lesson-homework h2 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.lesson-materials ul {
  list-style: none;
  padding-left: 1rem;
}

.lesson-materials li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.lesson-materials a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

.lesson-materials a:hover {
  color: #ff6b9d;
  text-decoration: underline;
}

.lesson-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Telegram Button */
.btn-telegram {
  background: #229ED9;
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  margin: 1.5rem 0;
  width: 100%;
}

.btn-telegram:hover {
  background: #1a8bbf;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(34, 158, 217, 0.4);
}

.login-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.waiting-spinner {
  font-size: 2rem;
  animation: pulse 1.5s infinite;
  margin: 1rem 0;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.waiting-text {
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.fallback-box {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem;
  margin-top: 1rem;
  text-align: left;
}

.fallback-box p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.command-box {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  font-family: monospace;
  font-size: 0.9rem;
  color: #7ee787;
  margin: 0.75rem 0;
  word-break: break-all;
}

.btn-small {
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
}

.login-steps {
  margin-top: 1.5rem;
  padding: 1rem;
  background: rgba(108, 99, 255, 0.1);
  border-radius: 0.75rem;
  text-align: left;
}

.login-steps .step {
  padding: 0.4rem 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Login Page */
.login-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  max-width: 400px;
  margin: 3rem auto;
  text-align: center;
}

.login-container h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.login-container > p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

#telegram-login-widget {
  margin: 2rem 0;
}

.login-note {
  color: var(--warning);
  font-size: 0.9rem;
  margin-top: 1rem;
}

/* No Access Page */
.no-access-container {
  background: var(--bg-card);
  border: 2px solid var(--error);
  border-radius: 1rem;
  padding: 3rem 2rem;
  max-width: 500px;
  margin: 2rem auto;
  text-align: center;
}

.no-access-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.no-access-container h2 {
  font-size: 1.5rem;
  color: var(--error);
  margin-bottom: 1rem;
}

.no-access-container > p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.access-info {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
  text-align: left;
}

.access-info h3 {
  color: var(--success);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.access-info ul {
  list-style: none;
  padding-left: 0;
}

.access-info li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
}

.tribute-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  display: inline-block;
  font-size: 1rem;
  transition: all 0.2s ease;
}

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

.access-note {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1.5rem;
  margin-bottom: 1rem;
}

/* Error Page */
.error-container {
  background: var(--bg-card);
  border: 2px solid var(--error);
  border-radius: 1rem;
  padding: 3rem 2rem;
  max-width: 500px;
  margin: 3rem auto;
  text-align: center;
}

.error-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.error-container h1 {
  color: var(--error);
  margin-bottom: 1rem;
}

.error-container p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* Footer */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-secondary);
  margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .track-card, .feature-card {
    min-height: auto;
  }

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

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

  .nav {
    flex-direction: column;
    width: 100%;
  }

  .user-info {
    width: 100%;
    justify-content: center;
  }

  .lesson-item {
    flex-direction: column;
    align-items: flex-start;
  }
}