:root {
  --bg: #ffffff;
  --bg-secondary: #f5f6f8;
  --text: #1a1a2e;
  --text-secondary: #5a5f72;
  --border: #e2e4e9;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --sidebar-bg: #f8f9fb;
  --sidebar-hover: #eef0f4;
  --sidebar-active: #e0e7ff;
  --link: #2563eb;
  --bounty: #059669;
  --upvotes: #6d28d9;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --radius: 8px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-secondary: #161822;
  --text: #e2e4e9;
  --text-secondary: #9ca3af;
  --border: #2a2d3a;
  --accent: #60a5fa;
  --accent-hover: #93bbfd;
  --sidebar-bg: #12141c;
  --sidebar-hover: #1e2030;
  --sidebar-active: #1e3a5f;
  --link: #60a5fa;
  --bounty: #34d399;
  --upvotes: #a78bfa;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  height: 100vh;
  position: sticky;
  top: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: background var(--transition), border var(--transition);
  z-index: 100;
}

.sidebar-header {
  padding: 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0;
}

.sidebar-section {
  margin-bottom: 0.25rem;
}

.sidebar-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  border: none;
  background: none;
  width: 100%;
  transition: color var(--transition);
}

.sidebar-section-title:hover {
  color: var(--text);
}

.sidebar-section-title .arrow {
  font-size: 0.6rem;
  transition: transform var(--transition);
}

.sidebar-section.collapsed .arrow {
  transform: rotate(-90deg);
}

.sidebar-section.collapsed .sidebar-items {
  display: none;
}

.sidebar-items {
  list-style: none;
}

.sidebar-item {
  display: block;
  padding: 0.4rem 1rem 0.4rem 1.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-item:hover {
  background: var(--sidebar-hover);
  color: var(--text);
}

.sidebar-item.active {
  background: var(--sidebar-active);
  color: var(--accent);
  font-weight: 600;
}

.content {
  flex: 1;
  max-width: 860px;
  padding: 2rem 2.5rem;
  overflow-y: auto;
  min-height: 100vh;
}

.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  color: var(--text-secondary);
}

.welcome h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.report-content h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text);
  line-height: 1.3;
}

.report-content p {
  margin-bottom: 1rem;
  line-height: 1.6;
}

.report-content ol {
  list-style: none;
  counter-reset: report-counter;
  padding: 0;
}

.report-content ol li {
  counter-increment: report-counter;
  position: relative;
  padding: 0.75rem 0 0.75rem 3rem;
  border-bottom: 1px solid var(--border);
  line-height: 1.6;
  font-size: 0.95rem;
}

.report-content ol li::before {
  content: counter(report-counter);
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 2rem;
  height: 2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.report-content a {
  color: var(--link);
  text-decoration: none;
  font-weight: 500;
}

.report-content a:hover {
  text-decoration: underline;
}

.report-content .report-meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.report-content .report-program {
  font-weight: 500;
  color: var(--text);
}

.report-content .report-upvotes {
  color: var(--upvotes);
  font-weight: 500;
}

.report-content .report-bounty {
  color: var(--bounty);
  font-weight: 500;
}

.content-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.content-error {
  color: #dc2626;
  text-align: center;
  padding: 2rem;
  font-size: 0.95rem;
}

.theme-toggle,
.menu-toggle {
  position: fixed;
  z-index: 200;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.6rem;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--text);
  transition: background var(--transition), border var(--transition), color var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
  background: var(--sidebar-hover);
}

.theme-toggle {
  top: 1rem;
  right: 1rem;
}

.menu-toggle {
  top: 1rem;
  left: 1rem;
  display: none;
}

.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 90;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    transition: left 0.25s ease;
  }

  .sidebar.open {
    left: 0;
  }

  .overlay.open {
    display: block;
  }

  .menu-toggle {
    display: block;
  }

  .content {
    padding: 1rem 1.25rem;
    padding-top: 3.5rem;
  }

  .theme-toggle {
    top: 0.75rem;
    right: 0.75rem;
  }

  .report-content ol li {
    padding-left: 2.5rem;
  }

  .report-content ol li::before {
    width: 1.6rem;
    height: 1.6rem;
    font-size: 0.7rem;
  }
}

.sidebar::-webkit-scrollbar,
.content::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-thumb,
.content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}