:root {
  color-scheme: light;

  /* Indigo-based palette */
  --color-primary-50: #eef2ff;
  --color-primary-100: #e0e7ff;
  --color-primary-200: #c7d2fe;
  --color-primary-300: #a5b4fc;
  --color-primary-500: #6366f1;
  --color-primary-600: #4f46e5;
  --color-primary-700: #4338ca;
  --color-primary-900: #312e81;

  --color-primary-1: #f5f7ff;
  --color-primary-2: #e7ebff;
  --color-primary-3: #d5dcff;
  --color-primary-4: #b7c4fb;
  --color-primary-5: #8c99e6;

  --color-secondary1-1: #f3e8ff;
  --color-secondary1-2: #e9d5ff;
  --color-secondary1-3: #d8b4fe;
  --color-secondary1-4: #c084fc;

  --color-secondary2-1: #dbeafe;
  --color-secondary2-2: #bfdbfe;
  --color-secondary2-3: #93c5fd;
  --color-secondary2-4: #60a5fa;
  --color-secondary2-5: #3b82f6;

  --color-gray-25: #f8fafc;
  --color-gray-50: #f8fafc;
  --color-gray-100: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  --color-text-primary: #0f172a;
  --color-text-secondary: #1f2937;
  --color-text-muted: #6b7280;
  --color-text-link: var(--color-primary-700);
  --color-text-link-hover: var(--color-primary-900);
  --color-text-contrast: #f8fafc;
  --color-text-button: #0f172a;
  --color-text-nav: var(--color-text-primary);

  --color-bg-page: var(--color-primary-1);
  --color-bg-input: #f8fafc;
  --color-bg-container: #ffffff;
  --color-bg-card: #ffffff;
  --color-bg-hover: var(--color-primary-2);
  --color-bg-sidebar: #f3f4ff;
  --color-bg-sidebar-header: var(--color-primary-2);
  --color-bg-table-header: var(--color-primary-2);
  --color-bg-nav: #0f172a;
  --color-bg-button: var(--color-primary-2);
  --color-bg-button-hover: var(--color-primary-3);
  --color-bg-icon: var(--color-secondary1-2);
  --color-bg-icon-status: var(--color-secondary2-2);
  --color-bg-hoverbox: #eef2ff;
  --color-bg-contributor: var(--color-secondary1-2);
  --color-bg-committer: var(--color-secondary2-2);
  --color-bg-activity-team: var(--color-secondary2-2);
  --color-bg-activity-user: var(--color-secondary2-1);

  --color-border: #cdd5e7;
  --color-border-focus: var(--color-primary-500);
  --color-border-contributor: var(--color-secondary2-2);
  --color-border-new: var(--color-secondary1-1);
  --color-border-aware: var(--color-secondary1-2);
  --color-border-reading: var(--color-secondary1-3);
  --color-border-read: var(--color-secondary2-3);

  --color-warning-bg: #fef3c7;
  --color-warning: #f59e0b;
  --color-warning-text: #92400e;
  --color-info: #38bdf8;
  --color-info-soft: #e0f2fe;
  --color-danger: #ef4444;
  --color-danger-soft: #fee2e2;
  --color-purple: #7c3aed;
  --color-success: #16a34a;
  --color-success-soft: #dcfce7;
  --color-note-soft: #fef9c3;

  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --color-primary-50: #161b33;
  --color-primary-100: #1d2440;
  --color-primary-200: #222c52;
  --color-primary-300: #2c3669;
  --color-primary-500: #6f7ee8;
  --color-primary-600: #8b9cf5;
  --color-primary-700: #c7d2fe;
  --color-primary-900: #e0e7ff;

  --color-primary-1: #0b1220;
  --color-primary-2: #0f172a;
  --color-primary-3: #131f35;
  --color-primary-4: #1b2743;
  --color-primary-5: #223055;

  --color-secondary1-1: #2b2244;
  --color-secondary1-2: #372b59;
  --color-secondary1-3: #45356f;
  --color-secondary1-4: #564086;

  --color-secondary2-1: #16263c;
  --color-secondary2-2: #1d2f4d;
  --color-secondary2-3: #254165;
  --color-secondary2-4: #2f4f7a;
  --color-secondary2-5: #3a5f93;

  --color-gray-25: #0b1220;
  --color-gray-50: #0f172a;
  --color-gray-100: #111827;
  --color-gray-300: #1f2937;
  --color-gray-500: #94a3b8;
  --color-gray-600: #cbd5e1;
  --color-gray-700: #e2e8f0;
  --color-gray-800: #e5e7eb;
  --color-gray-900: #f8fafc;

  --color-text-primary: #e2e8f0;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-text-link: #c7d2fe;
  --color-text-link-hover: #e0e7ff;
  --color-text-contrast: #f8fafc;
  --color-text-button: #e2e8f0;
  --color-text-nav: var(--color-text-contrast);

  --color-bg-page: var(--color-primary-1);
  --color-bg-input: #111827;
  --color-bg-container: var(--color-primary-2);
  --color-bg-card: #111827;
  --color-bg-hover: #1f2937;
  --color-bg-sidebar: var(--color-primary-2);
  --color-bg-sidebar-header: #111827;
  --color-bg-table-header: #111827;
  --color-bg-nav: #0b1220;
  --color-bg-button: #223055;
  --color-bg-button-hover: #2e3b66;
  --color-bg-icon: #1f2937;
  --color-bg-icon-status: #2b375c;
  --color-bg-hoverbox: #1a2337;
  --color-bg-contributor: #1f2545;
  --color-bg-committer: #1c2f4f;
  --color-bg-activity-team: #18253d;
  --color-bg-activity-user: #142235;

  --color-border: #1f2937;
  --color-border-focus: #818cf8;
  --color-border-contributor: #2b375c;
  --color-border-new: #3a5f93;
  --color-border-aware: #564086;
  --color-border-reading: #254165;
  --color-border-read: #2f4f7a;

  --color-warning-bg: #3a2c17;
  --color-warning: #f59e0b;
  --color-warning-text: #fcd34d;
  --color-info: #38bdf8;
  --color-info-soft: #10253b;
  --color-danger: #ef4444;
  --color-danger-soft: #3a1f24;
  --color-purple: #c084fc;
  --color-success: #22c55e;
  --color-success-soft: #1b2b1e;
  --color-note-soft: #3a3216;

  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
}

:root {
  /* Spacing Scale */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'Monaco', 'Courier New', monospace;

  --font-size-xs: 0.8rem;
  --font-size-sm: 0.85rem;
  --font-size-base: 0.9rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.05rem;
  --font-size-xl: 1.1rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  --font-family-base: var(--font-sans);
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.3;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.7;

  /* Borders */
  --border-width: 1px;
  --border-width-thick: 2px;
  --border-width-reply: 3px;

  --border-radius-sm: 4px;
  --border-radius-md: 6px;
  --border-radius-lg: 8px;
  --border-radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.1);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  /* Layout */
  --max-width-container: 1200px;
  --nav-height: 60px;
  --avatar-size-sm: 28px;
  --avatar-size-md: 32px;
  --avatar-size-default: 40px;
}

/* https://www.joshwcomeau.com/css/custom-css-reset/ */

/* 1. Use a more-intuitive box-sizing model */

*, *::before, *::after {
  box-sizing: border-box;
}

/* 2. Remove default margin */

* {
  margin: 0;
}

/* 3. Enable keyword animations */

@media (prefers-reduced-motion: no-preference) {
  html {
    interpolate-size: allow-keywords;
  }
}

body {
  /* 4. Add accessible line-height */
  line-height: 1.5;
  /* 5. Improve text rendering */
  -webkit-font-smoothing: antialiased;
}

/* 6. Improve media defaults */

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

/* 7. Inherit fonts for form controls */

input, button, textarea, select {
  font: inherit;
}

/* 8. Avoid text overflows */

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* 9. Improve line wrapping */

p {
  text-wrap: pretty;
}

h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-page);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
  max-width: var(--max-width-container);
  width: 100%;
  margin: 0 auto;
  padding: 0;
  background-color: var(--color-bg-container);
  min-width: 0;
  min-height: calc(100vh - var(--nav-height));
}

.page-layout.with-sidebar {
  display: grid;
  grid-template-columns: 480px 1fr;
  gap: 0;
  align-items: start;
}

.page-layout.with-sidebar .layout-sidebar {
  background: var(--color-bg-card);
  border-right: var(--border-width) solid var(--color-border);
  min-height: calc(100vh - var(--nav-height));
  background-color: var(--color-bg-sidebar);
}

/*
 * Header Layout
 */

.main-content {
  padding: var(--spacing-8) 0;
  min-height: calc(100vh - var(--nav-height));
}

.header-section {
  text-align: center;
  margin-bottom: var(--spacing-12);
}

.header-section h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-3) 0;
  }

.subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
  margin: 0;
}

/*
 * Topic View Layout
 */

.topic-header {
  background: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.topic-title-section {
  margin-bottom: var(--spacing-5);
}

.topic-title-section h1 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-3) 0;
    line-height: var(--line-height-tight);
  }

.topic-controls {
  display: flex;
  gap: var(--spacing-6);
  flex-wrap: wrap;
}

.view-controls {
  display: flex;
  gap: var(--spacing-4);
  align-items: center;
}

.view-mode-toggle,
.sort-toggle {
  display: flex;
  border: var(--border-width) solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.toggle-btn {
  padding: var(--spacing-2) var(--spacing-4);
  background: var(--color-bg-card);
  color: var(--color-gray-600);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-btn:not(:last-child) {
    border-right: var(--border-width) solid var(--color-gray-300);
  }

.toggle-btn:hover {
    background: var(--color-gray-50);
  }

.toggle-btn.active {
    background: var(--color-primary-500);
    color: var(--color-text-contrast);
  }

.topic-navigation {
  margin-top: var(--spacing-8);
  text-align: center;
}

.back-link {
  color: var(--color-gray-500);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--color-text-secondary);
  }

.participants-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.participant-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-3);
  align-items: center;
  padding: var(--spacing-3);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  background: var(--color-bg-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.participant-row.is-core-team {
    border-color: #ff0080;
    box-shadow: 0 2px 8px rgba(255, 0, 128, 0.15);
  }

.participant-row.is-committer {
    border-color: #8b5cf6;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.12);
  }

.participant-row.is-major-contributor {
    border-color: #f59e0b;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.12);
  }

.participant-row.is-significant-contributor {
    border-color: #10b981;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.12);
  }

.participant-row.is-past-contributor {
    border-color: var(--color-border);
    background: var(--color-gray-50);
  }

.participant-row:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

.participant-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.participant-name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.participant-more {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  padding: 0 var(--spacing-1);
}

.thread-outline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.branch-details {
  border-left: 3px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background: var(--color-bg-card);
  padding: var(--spacing-1) 0;
}

.branch-details summary {
  list-style: none;
  cursor: pointer;
}

.branch-details summary::-webkit-details-marker {
  display: none;
}

.outline-summary {
  padding: var(--spacing-2) var(--spacing-3);
}

.outline-item {
  display: block;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius-sm);
  border-left: 3px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text-primary);
  background: var(--color-bg-card);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  cursor: default;
}

.outline-item:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-primary-500);
    transform: translateX(2px);
  }

.outline-item.reply {
  padding-left: var(--spacing-4);
  border-left-color: var(--color-primary-200);
}

.outline-item.branch-start {
  cursor: pointer;
}

.outline-item.branch-0 { border-left-color: #2563eb; }

.outline-item.branch-1 { border-left-color: #7c3aed; }

.outline-item.branch-2 { border-left-color: #f59e0b; }

.outline-item.branch-3 { border-left-color: #10b981; }

.outline-item.branch-4 { border-left-color: #ef4444; }

.outline-item.branch-5 { border-left-color: #0ea5e9; }

.branch-details.branch-0 { border-left-color: #2563eb; }

.branch-details.branch-1 { border-left-color: #7c3aed; }

.branch-details.branch-2 { border-left-color: #f59e0b; }

.branch-details.branch-3 { border-left-color: #10b981; }

.branch-details.branch-4 { border-left-color: #ef4444; }

.branch-details.branch-5 { border-left-color: #0ea5e9; }

.outline-content {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-3);
  align-items: baseline;
}

.branch-toggle {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transform: rotate(0deg);
  transition: transform var(--transition-fast);
  width: 16px;
}

.branch-collapsed .branch-toggle,
.branch-details[open] .branch-toggle {
  transform: rotate(90deg);
}

.outline-meta {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.outline-avatars {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.outline-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: var(--border-width) solid var(--color-border);
  -o-object-fit: cover;
     object-fit: cover;
  background: var(--color-bg-card);
}

.outline-number {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.outline-icon {
  color: var(--color-primary-600);
  font-weight: var(--font-weight-bold);
}

.outline-author {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.outline-parent {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.outline-time {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

input {
  background-color: var(--color-bg-input);
  width: 100%;
  padding: var(--spacing-4);
  margin: var(--spacing-4) 0;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  display: block;
}

input:focus {
    outline: none;
    border-color: var(--color-border-focus);
  }

input[type=submit], input[type=button] {
  background-color: var(--color-bg-button);
}

/*
 * Navigation Component
 */

.main-navigation {
  background-color: var(--color-bg-nav);
  border-bottom: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  margin: 0 auto;
  padding: 0 var(--spacing-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: var(--nav-height);
  gap: var(--spacing-4);
}

.nav-brand {
  display: flex;
  flex-direction: column;
}

.brand-link {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-nav);
  text-decoration: none;
  margin-bottom: -2px;
}

.tagline {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
}

.nav-links {
  display: flex;
  gap: var(--spacing-6);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.nav-auth {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.nav-auth form {
  margin: 0;
}

.nav-user {
  color: var(--color-text-nav);
  font-weight: var(--font-weight-medium);
}

.nav-link {
  background-color: var(--color-bg-button);
  color: var(--color-text-button);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  border: var(--border-width) solid transparent;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
}

.nav-link:hover {
    background-color: var(--color-bg-button-hover);
  }

.nav-link-activity {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--color-danger);
  color: var(--color-text-contrast);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
}

.theme-toggle {
  border-color: var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    background: var(--color-bg-hover);
  }

.sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--spacing-5));
  align-self: start;
}

.sidebar-section {
  margin-bottom: var(--spacing-8);
}

.sidebar-content {
  padding: var(--spacing-3);
}

.sidebar-heading {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
  padding: var(--spacing-3);
  background-color: var(--color-bg-sidebar-header);
  text-align: right;
}

.sidebar .quick-filters {
  list-style: square inside;
  padding-left: 0;
}

:is(.sidebar .quick-filters) a {
    color: var(--color-text-link);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
  }

:is(.sidebar .quick-filters) a:hover {
    text-decoration: underline;
  }

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-6);
  padding-bottom: var(--spacing-3);
  border-bottom: var(--border-width) solid var(--color-border);
}

.section-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
  }

.new-topics-banner {
  background: linear-gradient(to right, var(--color-primary-50), var(--color-primary-100));
  border: var(--border-width) solid var(--color-primary-300);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-4);
  text-align: center;
}

.new-topics-link {
  color: var(--color-primary-700);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  display: block;
}

.new-topics-link:hover {
    color: var(--color-primary-900);
    text-decoration: underline;
  }

.stats {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

.topics-table table {
    width: 100%;
    border-collapse: collapse;
  }

.topics-table th {
    background: var(--color-bg-table-header);
    padding: var(--spacing-4);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
  }

.topics-table th.activity-header {
    text-align: center;
  }

.topics-table th.participants-header {
    text-align: right;
  }

.topics-table th.topic-title {
    border-left: var(--color-bg-table-header) 8px solid;
  }

.topics-table td {
    padding: var(--spacing-2);
    border-bottom: var(--border-width) solid var(--color-border);
    vertical-align: top;
  }

.topics-table .topic-replies {
    width: 100px;
  }

.topics-table .topic-activity {
    width: 140px;
  }

.topics-table .topic-participants {
    width: 250px;
    text-align: right;
  }

:is(.topics-table .topic-participants) .topic-icon {
      margin: 0 4px;
      vertical-align: top;
    }

:is(.topics-table .topic-participants) .participants {
      display: inline-block;
    }

.topic-icon {
  display: inline-block;
  background: var(--color-bg-icon);
  border-radius: var(--border-radius-sm);
  padding: 3px;
  margin: 0px;
  margin-right: 10px;
  position: relative;
}

.topic-icon-badge {
  position: absolute;
  bottom: -6px;
  right: -6px;
  min-width: 18px;
  height: 18px;
  padding: 2px 4px;
  border-radius: 999px;
  background: var(--color-bg-icon);
  color: var(--color-text-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.topic-icon-badge-sup {
  bottom: -6px;
  right: -6px;
  border-radius: 6px;
  padding: 2px 6px;
  font-variant-numeric: tabular-nums;
}

.status-border {
  border-left: 8px solid transparent;
}

.status-border.status-new {
  border-left-color: var(--color-border-new);
}

.status-border.status-aware {
  border-left-color: var(--color-border-aware);
}

.status-border.status-reading {
  border-left-color: var(--color-border-reading);
}

.status-border.status-read {
  border-left-color: var(--color-border-read);
}

.activity-core_team {
  background-color: var(--color-bg-committer);
}

.activity-committer {
  background-color: var(--color-bg-committer);
}

.activity-note {
  background-color: var(--color-bg-activity-team);
}

.activity-note .topic-icon-badge {
    background-color: var(--color-bg-activity-team);
  }

.topic-icon-reading {
  background-color: var(--color-bg-activity-team);
}

.topic-icon-reading .topic-icon-badge {
    background-color: var(--color-bg-activity-team);
  }

.activity-team {
  background-color: var(--color-bg-activity-team);
}

.activity-team .topic-icon-badge {
    background-color: var(--color-bg-activity-team);
  }

.activity-team.is-mine {
  background-color: var(--color-bg-activity-user);
}

.activity-team-read {
  background-color: var(--color-bg-activity-team);
}

.activity-team-read .topic-icon-badge {
    background-color: var(--color-bg-activity-team);
  }

.is-hidden {
  display: none !important;
}

.topic-row:hover {
    background: var(--color-bg-hover);
  }

.topic-row.topic-read {
  color: var(--color-text-muted);
}

.topic-icon-hover {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 20;
  background: var(--color-bg-hoverbox);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-3);
  box-shadow: var(--shadow-lg);
  min-width: 260px;
}

.topic-participants .topic-icon-hover {
  left: auto;
  right: 0;
}

.topic-icon.is-open .topic-icon-hover {
  display: block;
}

.topic-icon-hover .participant-row {
  margin-bottom: var(--spacing-2);
}

.topic-icon-hover .participant-row:last-child {
  margin-bottom: 0;
}

.topic-meta span {
    padding-right: var(--spacing-2);
  }

.topic-link {
  color: var(--color-text-link);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
}

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

.topic-row.topic-read .topic-link {
  color: var(--color-text-muted);
}

:is(.topic-row.topic-read .topic-link):hover {
    color: var(--color-text-muted);
    text-decoration: underline;
  }

.activity-info {
  display: flex;
  flex-direction: column;
  gap: 0;
  text-align: center;
  font-size: var(--font-size-sm);
}

.activity-replies {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.activity-time {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.activity-author {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.attachment-icon {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-secondary);
}

.status-shape {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--color-gray-50);
  border: 2px solid transparent;
  color: inherit;
}

.is-new .status-shape {
  border-color: var(--color-danger);
  background: var(--color-danger-soft);
}

.is-aware .status-shape {
  border-color: var(--color-warning);
  background: var(--color-warning-bg);
  border-radius: 999px;
}

.is-reading .status-shape {
  border-color: var(--color-info);
  background: var(--color-info-soft);
  border-radius: 4px;
}

.is-read .status-shape {
  border-color: var(--color-primary-600);
  background: var(--color-primary-100);
  border-radius: 4px;
}

.team-reader-avatars {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--spacing-2);
}

.team-reader-avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
}

.team-reader-avatar.is-read {
  border-color: var(--color-primary-600);
}

.team-reader-avatar.is-reading {
  border-color: var(--color-info);
}

.note-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: var(--spacing-2);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.note-icon {
  font-size: var(--font-size-base);
}

.note-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  padding: 2px 6px;
  border-radius: 10px;
  background: var(--color-note-soft);
  color: var(--color-warning-text);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.topics-actions {
  display: flex;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  align-items: center;
  border-bottom: var(--border-width) solid var(--color-border);
}

.mark-aware-button {
  padding: var(--spacing-2) var(--spacing-4);
  border: var(--border-width) solid var(--color-border);
  background: var(--color-bg-card);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.mark-aware-button.secondary {
    background: var(--color-bg-hover);
  }

.global-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  padding: var(--spacing-2) var(--spacing-4);
  text-align: center;
  font-weight: var(--font-weight-semibold);
}

.status-progress {
  margin-top: 6px;
  width: 120px;
  height: 6px;
  background: var(--color-bg-hover);
  border-radius: 999px;
  overflow: hidden;
}

.status-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-300), var(--color-primary-600));
}

.tag-filter-banner {
  margin: var(--spacing-3) 0;
  padding: var(--spacing-3);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  background: var(--color-gray-50);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.clear-tag-filter {
  color: var(--color-text-link);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
}

.view-toggle-bar {
  display: flex;
  gap: var(--spacing-3);
  margin: var(--spacing-3) 0;
  flex-wrap: wrap;
}

.view-toggle-group {
  display: flex;
  gap: var(--spacing-2);
}

.toggle-btn {
  padding: 6px 12px;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-sm);
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  background: var(--color-bg-card);
}

.toggle-btn.active {
  background: var(--color-primary-50);
  border-color: var(--color-primary-200);
}

/*
 * Avatar Component
 */

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.avatar {
  width: var(--avatar-size-default);
  height: var(--avatar-size-default);
  border-radius: var(--border-radius-full);
  -o-object-fit: cover;
     object-fit: cover;
  border: var(--border-width-thick) solid var(--color-border);
  flex-shrink: 0;
}

.avatar-small {
  width: var(--avatar-size-md);
  height: var(--avatar-size-md);
}

.user-details {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.user-name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  line-height: var(--line-height-tight);
}

.user-time {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-tight);
}

/*
 * Topic Participants Component
 * Shows avatars of people who participated in a discussion
 */

.topic-participants {
  align-items: center;
  gap: var(--spacing-2);
  flex-wrap: nowrap;
}

.participants-avatars {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.participant-avatar {
  width: 32px;
  min-width: 32px;
  height: 32px;
  border-radius: var(--border-radius-full);
  border: 2px solid var(--color-bg-card);
  -o-object-fit: cover;
     object-fit: cover;
  margin-left: -8px;
  transition: transform var(--transition-fast), z-index 0s;
  position: relative;
  flex-shrink: 0;
  display: block;
}

.participant-avatar:hover {
    transform: translateY(-2px) scale(1.1);
    z-index: 10;
    cursor: pointer;
  }

.participant-avatar:first-child {
    margin-left: 0;
  }

.participant-avatar.is-core-team {
  border-color: #ff0080;
  border-width: 3px;
  box-shadow: 0 0 0 1px #ff0080;
}

.participant-avatar.is-committer {
  border-color: #8b5cf6;
  border-width: 3px;
}

.participant-avatar.is-major-contributor {
  border-color: #f59e0b;
  border-width: 2px;
}

.participant-avatar.is-significant-contributor {
  border-color: #10b981;
  border-width: 2px;
}

.participant-avatar.is-past-contributor {
  border-color: var(--color-text-muted);
  border-style: dashed;
}

.participants-count {
  border-radius: var(--border-radius-full);
  background: var(--color-bg-icon);
  min-width: 32px;
  height: 32px;
  text-align: center;
  line-height: 32px;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-medium);
  margin-left: var(--spacing-1);
}

/* Tooltip on hover */

.participant-avatar[title] {
  cursor: help;
}

.messages-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.message-card {
  background: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  scroll-margin-top: 90px;
}

.threaded .reply-message {
  margin-left: 30px;
  border-left: var(--border-width-reply) solid var(--color-border);
}

.message-header {
  background: var(--color-gray-50);
  padding: var(--spacing-4) var(--spacing-5);
  border-bottom: var(--border-width) solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--spacing-3);
}

.message-author {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.author-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.message-number {
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-600);
  font-variant-numeric: tabular-nums;
}

.message-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: var(--border-width) solid var(--color-border);
  background: var(--color-bg-card);
}

.author-details {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  font-size: var(--font-size-md);
}

.author-email {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.message-meta {
  display: flex;
  gap: var(--spacing-4);
  align-items: center;
  flex-wrap: wrap;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.reply-indicator {
  color: var(--color-purple);
  font-style: italic;
}

.attachment-indicator {
  color: var(--color-success);
}

.message-content {
  padding: var(--spacing-5);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.message-content.is-read {
    background: var(--color-bg-hover);
  }

.thread-actions {
  margin-bottom: var(--spacing-4);
}

.thread-actions .button-secondary {
    padding: var(--spacing-2) var(--spacing-4);
    border: var(--border-width) solid var(--color-border);
    background: var(--color-bg-card);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
  }

.message-subject {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
  font-size: var(--font-size-lg);
}

.message-body {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  font-family: var(--font-mono);
}

.message-body p {
    margin-bottom: var(--spacing-4);
  }

:is(.message-body p):last-child {
      margin-bottom: 0;
    }

.message-body blockquote {
    margin: var(--spacing-3) 0;
    padding-left: var(--spacing-4);
    border-left: var(--border-width) solid var(--color-border);
  }

.message-body .quoted-block {
    margin-top: var(--spacing-3);
  }

:is(.message-body .quoted-block) summary {
      cursor: pointer;
      color: var(--color-text-muted);
      font-weight: var(--font-weight-medium);
      margin-bottom: var(--spacing-2);
    }

:is(.message-body .quoted-block) blockquote {
      margin-top: 0;
    }

.message-body .message-diff {
    background: var(--color-bg-hover);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-3);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    overflow-x: auto;
    white-space: pre;
  }

.message-body .message-id-anchor {
    display: block;
    height: 0;
    width: 0;
    overflow: hidden;
  }

.message-body .inline-reference {
    position: relative;
    display: inline-block;
    margin-left: 2px;
    color: var(--color-text-muted);
    font-size: 0.9em;
    cursor: pointer;
  }

.message-body .reference-hover {
    display: none;
    position: absolute;
    left: 0;
    top: 120%;
    z-index: 5;
    background: var(--color-bg-card);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--color-text-secondary);
    min-width: 200px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    white-space: normal;
  }

.message-body .inline-reference:hover .reference-hover {
    display: block;
  }

.message-body .reference-definition {
    color: var(--color-text-secondary);
  }

.message-attachments {
  margin-top: var(--spacing-5);
  padding-top: var(--spacing-4);
  border-top: var(--border-width) solid var(--color-border);
}

.message-attachments h4 {
    margin: 0 0 var(--spacing-3) 0;
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-semibold);
  }

.attachment {
  padding: var(--spacing-2) var(--spacing-3);
  background: var(--color-bg-hover);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-2);
}

.attachment-info {
  display: flex;
  gap: var(--spacing-3);
  align-items: center;
  font-size: var(--font-size-sm);
}

.filename {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.content-type {
  color: var(--color-text-muted);
}

.import-metadata {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: var(--border-width) solid var(--color-border);
}

.import-metadata details {
    font-size: var(--font-size-sm);
  }

.import-metadata summary {
    color: var(--color-text-muted);
    cursor: pointer;
    font-weight: var(--font-weight-medium);
  }

.import-log {
  margin-top: var(--spacing-2);
  padding: var(--spacing-2);
  background: var(--color-bg-hover);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  white-space: pre-wrap;
  overflow-x: auto;
}

.notes-block {
  margin: var(--spacing-4) 0;
  padding: var(--spacing-4);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  background: var(--color-bg-card);
}

.thread-notes-container .notes-block {
  margin-top: var(--spacing-3);
}

.notes-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
}

.notes-header h4 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.notes-count {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.notes-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-3);
}

.notes-empty {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-3);
}

.note-card {
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-3);
  background: var(--color-bg-card);
}

.note-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.note-author {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.note-body {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2);
}

.note-tags,
.note-mentions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-top: var(--spacing-1);
}

.note-tag {
  background: var(--color-gray-100);
  padding: 2px 8px;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.note-mentions-label {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.note-mention {
  background: var(--color-gray-50);
  padding: 2px 8px;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-primary);
}

.note-edit-toggle summary {
  cursor: pointer;
  color: var(--color-text-link);
  font-size: var(--font-size-sm);
}

.note-field {
  margin-bottom: var(--spacing-2);
}

.note-textarea {
  width: 100%;
  border-radius: var(--border-radius-sm);
  border: var(--border-width) solid var(--color-border);
  padding: var(--spacing-2);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

.note-actions {
  display: flex;
  justify-content: flex-end;
}

.note-actions-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-top: var(--spacing-2);
}

.note-delete-button {
  padding: 0;
  background: none;
  border: none;
  color: var(--color-text-link);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  text-decoration: none;
}

.note-delete-button:hover {
    text-decoration: underline;
  }

.notes-inline-add {
  margin: var(--spacing-3) 0;
}

.note-form-toggle {
  margin-top: var(--spacing-2);
}

.note-form-toggle summary {
  cursor: pointer;
  color: var(--color-text-link);
  font-weight: var(--font-weight-medium);
}

.activity-search {
  display: flex;
  gap: var(--spacing-3);
  margin: var(--spacing-3) 0;
}

.activities-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  margin-top: var(--spacing-2);
}

.activity-card {
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  background: var(--color-bg-card);
}

.activity-card.is-unread {
  border-color: var(--color-primary-200);
  background: var(--color-primary-50);
}

.activity-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.activity-type {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.activity-unread-badge {
  padding: 2px 8px;
  background: var(--color-primary-600);
  color: var(--color-text-contrast);
  border-radius: 999px;
  font-size: var(--font-size-xs);
}

.activity-title a {
  color: var(--color-text-link);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
}

.activity-snippet {
  margin-top: var(--spacing-2);
  color: var(--color-text-secondary);
}

.activity-actions {
  margin-top: var(--spacing-2);
}

.activity-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-top: var(--spacing-2);
}

.activity-missing {
  color: var(--color-text-muted);
}