/* ————————————————————————————————————————
   Animated Moon/Sun Toggle | Viewer Tabs | Jump Button | UCL Logo | Centered Header
   ———————————————————————————————————————— */

/* ——————— Light Theme (default) ——————— */
.light,
:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --link: #0066cc;
  --border: #e0e0e0;
  --code-bg: #f6f8fa;
  --heading: #0a0a0a;
  --accent: #ff9900;
  --card-bg: #fafafa;
}

/* ——————— Dark Theme ——————— */
.dark {
  --bg: #0d1117;
  --text: #c9d1d9;
  --link: #58a6ff;
  --border: #30363d;
  --code-bg: #161b22;
  --heading: #f0f6fc;
  --accent: #ffb74d;
  --card-bg: #161b22;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ——————————————————— Header: Centered & Aligned ——————————————————— */
header {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  flex-wrap: wrap;
  gap: 1rem;
}

.header-logo {
  flex: 0 0 auto;
}

.ucl-logo {
  height: 48px;
  width: auto;
  filter: var(--logo-filter, none);
  transition: filter 0.3s ease;
}

header h1 {
  flex: 1;
  text-align: center;
  margin: 0;
  padding-right: 12%; /* Space for theme toggle */
  font-size: 2rem;
  color: var(--heading);
}

.subtitle {
  margin: 0;
  font-size: 0.8rem;
  color: #666;
  text-align: center;
  max-width: 100%;
}

/* Dark mode logo */
.dark .ucl-logo {
  filter: brightness(0) invert(1);
}

/* Responsive: Stack on mobile */
@media (max-width: 768px) {
  .header-top {
    flex-direction: column;
    text-align: center;
  }
  header h1 {
    order: -1;
    margin-bottom: 0.5rem;
  }
}

/* ——————— Theme Toggle Button (Animated Moon/Sun Icon) ——————— */
.theme-toggle-btn {
  background: var(--code-bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.5rem;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.theme-toggle-btn:hover {
  background: var(--border);
  transform: scale(1.05);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.theme-icon {
  position: relative;
  width: 20px;
  height: 20px;
}

.theme-icon svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Sun: Real rays */
.sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

/* Dark mode: show moon */
.dark .sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

.dark .moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ——————————————————— Search ——————————————————— */
.search-container {
  width: 100%;
  max-width: 500px;
  /* padding-top: 3%; */
  position: relative;
  display: flex;
}

#search-input {
  width: 100%;
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
}

#search-input:focus {
  outline: 2px solid var(--accent);
}

.clear-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: #888;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.clear-btn:hover {
  color: var(--text);
}

/* ——————————————————— Repo Grid ——————————————————— */
.repo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}
.repo-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
}
.repo-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}
.repo-name {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.repo-desc {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 1rem;
}
.repo-meta {
  font-size: 0.85rem;
  color: #666;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.repo-lang {
  background: var(--code-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: "SF Mono", monospace;
  font-size: 0.75rem;
}
.badge {
  background: #28a745;
  color: #fff;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
}

/* ——————————————————— Detail View ——————————————————— */
#detail-view {
  display: none;
  animation: fadeIn 0.3s ease-in;
}
.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.back-btn {
  color: var(--link);
  text-decoration: none;
  font-weight: 500;
}
.back-btn:hover {
  text-decoration: underline;
}
.github-btn {
  background: #24292e;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.github-btn:hover {
  background: #2ea44f;
}

/* ——————— Release + Jump Button (same line, right-aligned, SVG down arrow) ——————— */
.release-jump-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.release-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  background: none;
  border: none;
  padding: 0;
}

.release-link a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.release-link a:hover {
  text-decoration: underline;
}

/* Jump Button with SVG down arrow */
.jump-to-viewer {
  margin: 0;
}

.jump-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  transition: all 0.2s;
}

.jump-btn:hover {
  background: #e68a00;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.jump-icon {
  width: 16px;
  height: 16px;
  pointer-events: none;
}

/* ——————————————————— Altium Viewer (Bottom) ——————————————————— */
.altium-viewer-section {
  margin: 3rem 0 1.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--border);
}
.altium-viewer-section h2 {
  margin: 0 0 1rem;
  font-size: 1.5rem;
  color: var(--accent);
  text-align: center;
}

.altium-tabs {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.altium-tab-buttons {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--card-bg);
}
.altium-tab-btn {
  flex: 1;
  padding: 0.75rem;
  background: none;
  border: none;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  text-align: center;
}
.altium-tab-btn:hover {
  background: var(--code-bg);
}
.altium-tab-btn.active {
  background: var(--bg);
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}
.altium-tab-content body {
  margin: 0;
  padding: 0;
  height: 720px;
  overflow: hidden;
  display: block;
}
.altium-tab-content iframe {
  width: 100% !important;
  height: 720px !important;
  border: none !important;
}

/* ——————————————————— README Content ——————————————————— */
#detail-content h2 {
  margin: 2rem 0 1rem;
  color: var(--heading);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}
#detail-content pre {
  background: #000;
  color: #f8f8f2;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0;
}
#detail-content code {
  background: rgba(0, 0, 0, 0.08);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: "SF Mono", monospace;
}
#detail-content img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1rem 0;
}
#detail-content a {
  color: var(--link);
  text-decoration: underline;
}
#detail-content a:hover {
  color: var(--accent);
}

/* Custom Notes */
.custom-note {
  padding: 1rem;
  border-radius: 8px;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  line-height: 1.5;
}
.custom-note.warning {
  background: #fff3cd;
  color: #856404;
  border-left: 4px solid #ffc107;
}
.custom-note.info {
  background: #d1ecf1;
  color: #0c5460;
  border-left: 4px solid #17a2b8;
}
@media (prefers-color-scheme: dark) {
  .custom-note.warning {
    background: #533f03;
    color: #ffda6a;
    border-left-color: #ffeb3b;
  }
  .custom-note.info {
    background: #0c2d3a;
    color: #a0d8ef;
    border-left-color: #17a2b8;
  }
}

/* ——————————————————— Utilities ——————————————————— */
.loading,
.error {
  text-align: center;
  padding: 2rem;
  font-style: italic;
  color: #888;
}
.error {
  color: #d73a49;
  background: #ffeef0;
  border-radius: 6px;
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ——————————————————— Footer ——————————————————— */
footer {
  text-align: center;
  padding: 3rem 0;
  color: #666;
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}