/* GitHub-Style UI */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --link-color: #58a6ff;
  --link-hover: #1f6feb;
  --accent-color: #238636;
  --transition: all 0.2s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    Helvetica, Arial, sans-serif;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  font-size: 14px;
}

/* GitHub Header */
.github-header {
  background-color: #010409;
  border-bottom: 1px solid var(--border-color);
  padding: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1400px;
  margin: 0 auto;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hamburger-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  border-radius: 6px;
  transition: var(--transition);
}

.hamburger-btn:hover {
  background-color: var(--bg-tertiary);
}

.github-logo {
  color: var(--text-primary);
  display: flex;
  align-items: center;
  text-decoration: none;
}

.username {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.header-center {
  flex: 1;
  max-width: 500px;
  display: none;
}

.search-container {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: var(--transition);
}

.search-container:hover {
  border-color: var(--text-muted);
}

.search-icon {
  color: var(--text-secondary);
  flex-shrink: 0;
}

.search-text {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.search-text kbd {
  display: inline-block;
  padding: 2px 5px;
  font: 11px monospace;
  line-height: 10px;
  color: var(--text-secondary);
  vertical-align: middle;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  box-shadow: inset 0 -1px 0 var(--border-color);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-icon-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  border-radius: 6px;
  transition: var(--transition);
}

.header-icon-btn:hover {
  background-color: var(--bg-tertiary);
}

.header-profile-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  border-radius: 50%;
  overflow: hidden;
}

.header-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

/* Profile Navigation */
.profile-nav {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  position: sticky;
  top: 65px;
  z-index: 90;
}

.nav-container {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 16px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: var(--transition);
}

.nav-item:hover {
  border-bottom-color: var(--text-muted);
}

.nav-item.active {
  border-bottom-color: #f78166;
  font-weight: 600;
}

.nav-icon {
  opacity: 0.7;
}

.nav-badge {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 2px 6px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

/* Page Container */
.page-container {
  max-width: 1400px;
  margin: 0 auto;
}

/* Layout */
.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  padding: 24px;
  background-color: var(--bg-primary);
}

.profile-card {
  text-align: center;
}

.profile-image {
  width: 100%;
  max-width: 260px;
  height: auto;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  object-fit: cover;
  margin-bottom: 16px;
}

.profile-name {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.profile-username {
  font-size: 20px;
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.profile-bio {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.5;
  margin-top: 16px;
}

.social-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  text-decoration: none;
  transition: var(--transition);
}

.social-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 24px;
}

.content-wrapper {
  max-width: 100%;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.section-title {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-primary);
  margin: 0;
}

.customize-link {
  font-size: 12px;
  color: var(--link-color);
  text-decoration: none;
  transition: var(--transition);
}

.customize-link:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

/* Courses Grid */
.courses-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* YouTube Grid */
.youtube-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* Course Card */
.course-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 16px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: row;
  gap: 16px;
  transition: var(--transition);
  position: relative;
  min-height: 120px;
}

.course-card:hover {
  border-color: var(--text-muted);
}

.course-content-wrapper {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.course-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.course-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.course-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.6;
}

.course-title-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
}

.course-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--link-color);
  line-height: 1.25;
  margin: 0;
  word-break: break-word;
}

.course-card:hover .course-title {
  text-decoration: underline;
}

.public-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  line-height: 1;
}

.course-menu {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.6;
  margin-left: 8px;
}

.course-image-wrapper {
  width: 128px;
  height: 128px;
  flex-shrink: 0;
  border-radius: 6px;
  overflow: hidden;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  align-self: center;
}

.course-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--transition);
}

.course-card:hover .course-image {
  opacity: 0.9;
}

.course-description {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-footer {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: auto;
}

.course-language {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.language-color {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #f1e05a;
}

.course-stat {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.stat-icon {
  width: 16px;
  height: 16px;
  opacity: 0.6;
}

/* YouTube Channel Card */
.youtube-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 16px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: row;
  gap: 16px;
  transition: var(--transition);
  position: relative;
  min-height: 120px;
}

.youtube-card:hover {
  border-color: var(--text-muted);
}

.youtube-content-wrapper {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.youtube-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.youtube-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.youtube-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: #ff0000;
}

.youtube-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--link-color);
  line-height: 1.25;
  margin: 0;
  word-break: break-word;
}

.youtube-card:hover .youtube-title {
  text-decoration: underline;
}

.youtube-description {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.youtube-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: auto;
}

.youtube-stat {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.youtube-logo-wrapper {
  width: 88px;
  height: 88px;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  align-self: center;
}

.youtube-logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--transition);
}

.youtube-card:hover .youtube-logo {
  opacity: 0.9;
}

/* Loading State */
.loading {
  text-align: center;
  padding: 48px;
  color: var(--text-secondary);
}

/* Platforms Grid */
.platforms-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* Platform Card */
.platform-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 16px;
  color: inherit;
  display: flex;
  flex-direction: row;
  gap: 16px;
  transition: var(--transition);
  position: relative;
  min-height: 120px;
}

.platform-card:hover {
  border-color: var(--text-muted);
}

.platform-content-wrapper {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.platform-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.platform-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.platform-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.6;
}

.platform-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--link-color);
  line-height: 1.25;
  margin: 0;
  word-break: break-word;
  text-decoration: none;
  transition: var(--transition);
}

.platform-title:hover {
  text-decoration: underline;
}

.platform-description {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.platform-app-links {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  flex-wrap: wrap;
}

.app-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition);
}

.app-link:hover {
  background-color: var(--bg-primary);
  border-color: var(--text-muted);
}

.app-icon {
  width: 14px;
  height: 14px;
  opacity: 0.8;
}

.platform-logo-wrapper {
  width: 96px;
  height: 96px;
  flex-shrink: 0;
  border-radius: 12px;
  overflow: hidden;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  align-self: center;
}

.platform-logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--transition);
}

.platform-card:hover .platform-logo {
  opacity: 0.9;
}

/* Mobile: stack image on top */
@media (max-width: 767px) {
  .course-card {
    flex-direction: column;
  }

  .course-image-wrapper {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    align-self: stretch;
    order: -1;
  }

  .youtube-card {
    flex-direction: column;
  }

  .youtube-logo-wrapper {
    width: 120px;
    height: 120px;
    align-self: center;
  }

  .platform-card {
    flex-direction: column;
  }

  .platform-logo-wrapper {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    align-self: center;
  }

  .username {
    display: none;
  }
}

/* Desktop Layout */
@media (min-width: 768px) {
  .header-center {
    display: block;
  }

  .profile-nav {
    top: 65px;
  }

  .layout {
    flex-direction: row;
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 24px;
  }

  .sidebar {
    width: 100%;
    max-width: 320px;
    position: sticky;
    top: 145px;
    height: fit-content;
    padding: 0;
  }

  .main-content {
    flex: 1;
    padding: 0;
  }

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

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

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

@media (min-width: 1200px) {
  .courses-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.course-card {
  animation: fadeIn 0.3s ease-out;
  animation-fill-mode: both;
}

.course-card:nth-child(1) {
  animation-delay: 0.05s;
}
.course-card:nth-child(2) {
  animation-delay: 0.1s;
}
.course-card:nth-child(3) {
  animation-delay: 0.15s;
}
.course-card:nth-child(4) {
  animation-delay: 0.2s;
}
.course-card:nth-child(5) {
  animation-delay: 0.25s;
}
.course-card:nth-child(6) {
  animation-delay: 0.3s;
}

.sponsor-text {
  font-size: 16px;
  margin-top: 10px;
}