/* ==============================================================================
   Simple & Modern Issue Tracker - Design System & Styles
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Color Palette - Light Mode */
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #e2e8f0;
  
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  --border-focus: #6366f1;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --text-inverse: #ffffff;

  /* Primary Brand - Indigo */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-border: #c7d2fe;
  --primary-text: #3730a3;

  /* Semantic Colors */
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;
  --success-solid: #10b981;

  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  --warning-text: #92400e;
  --warning-solid: #f59e0b;

  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --danger-text: #991b1b;
  --danger-solid: #ef4444;

  --info-bg: #f0f9ff;
  --info-border: #bae6fd;
  --info-text: #075985;
  --info-solid: #0284c7;

  /* Radii & Shadows */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);

  --transition: all 0.15s ease-in-out;
}

[data-theme="dark"] {
  --bg-app: #090d16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1f2937;
  --bg-subtle: #1a2234;
  --bg-hover: #26334d;
  
  --border-color: #243048;
  --border-subtle: #334155;
  --border-focus: #818cf8;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --text-inverse: #ffffff;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #1e1b4b;
  --primary-border: #3730a3;
  --primary-text: #e0e7ff;

  --success-bg: #064e3b;
  --success-border: #047857;
  --success-text: #a7f3d0;

  --warning-bg: #451a03;
  --warning-border: #78350f;
  --warning-text: #fde68a;

  --danger-bg: #450a0a;
  --danger-border: #7f1d1d;
  --danger-text: #fecaca;

  --info-bg: #082f49;
  --info-border: #0369a1;
  --info-text: #bae6fd;

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
}

/* ==============================================================================
   Reset & Base
   ============================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

/* ==============================================================================
   Navbar
   ============================================================================== */
.navbar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(8px);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.875rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  background-color: var(--bg-subtle);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.6rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
}

.user-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ==============================================================================
   Main Content Layout
   ============================================================================== */
.main-container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
}

/* Page Headers */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.page-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ==============================================================================
   Buttons & Inputs
   ============================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background-color: var(--bg-subtle);
}

.btn-danger {
  background-color: var(--danger-solid);
  color: var(--text-inverse);
}
.btn-danger:hover {
  opacity: 0.9;
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}

.btn-icon {
  padding: 0.4rem;
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  margin-bottom: 1rem;
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==============================================================================
   Badges & Tags
   ============================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.25;
}

/* Status Badges */
.badge-status-open {
  background-color: var(--info-bg);
  border: 1px solid var(--info-border);
  color: var(--info-text);
}

.badge-status-progress {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
}

.badge-status-closed {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

/* Type Badges */
.badge-type {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  text-transform: none;
  font-weight: 500;
}

.badge-type-bug {
  background-color: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-text);
}

.badge-type-feature {
  background-color: #faf5ff;
  border-color: #e9d5ff;
  color: #6b21a8;
}

[data-theme="dark"] .badge-type-feature {
  background-color: #3b0764;
  border-color: #581c87;
  color: #e9d5ff;
}

.badge-type-task {
  background-color: var(--info-bg);
  border-color: var(--info-border);
  color: var(--info-text);
}

/* Tags */
.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.45rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==============================================================================
   Card / Container
   ============================================================================== */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
}

.card-body {
  padding: 1.25rem;
}

/* ==============================================================================
   Filters Toolbar
   ============================================================================== */
.filter-bar {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.filter-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr 1fr auto;
  gap: 0.625rem;
  align-items: center;
}

@media (max-width: 1024px) {
  .filter-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .filter-grid {
    grid-template-columns: 1fr;
  }
}

/* ==============================================================================
   Issues Table
   ============================================================================== */
.table-container {
  overflow-x: auto;
}

.issue-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.issue-table th {
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
}

.issue-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
  vertical-align: middle;
}

.issue-row {
  transition: var(--transition);
}

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

.issue-id-col {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-muted);
  width: 70px;
}

.issue-title-link {
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
  display: block;
}

.issue-title-link:hover {
  color: var(--primary);
}

/* ==============================================================================
   Detail View
   ============================================================================== */
.issue-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 860px) {
  .issue-layout {
    grid-template-columns: 1fr;
  }
}

.sidebar-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.meta-value {
  font-size: 0.875rem;
  color: var(--text-main);
}

/* Markdown Rendering */
.markdown-body {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text-main);
}

.markdown-body p { margin-bottom: 0.75rem; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}
.markdown-body ul, .markdown-body ol {
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
}
.markdown-body code {
  background-color: var(--bg-subtle);
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85em;
}
.markdown-body pre {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 0.875rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 0.75rem;
}
.markdown-body pre code {
  background: none;
  padding: 0;
}
.markdown-body blockquote {
  border-left: 3px solid var(--primary);
  padding-left: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

/* Comments */
.comment-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
}

.comment-header {
  background-color: var(--bg-subtle);
  padding: 0.5rem 0.875rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
}

.comment-body {
  padding: 0.875rem;
}

/* Alerts */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.alert-danger {
  background-color: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
}
.alert-success {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.page-info {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* HTMX Loading Indicator */
.htmx-indicator {
  display: none;
}
.htmx-request .htmx-indicator {
  display: inline-block;
}
.htmx-request.htmx-indicator {
  display: inline-block;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.4rem;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
}

/* ==============================================================================
   Attachments & Lightbox
   ============================================================================== */
.attachments-section {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.attachments-heading {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.attachments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.attachment-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-sm);
}

.attachment-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Thumbnail Card */
.attachment-card-thumb .attachment-preview {
  height: 120px;
  background-color: var(--bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}

.attachment-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s ease;
}

.attachment-card-thumb:hover .attachment-thumb-img {
  transform: scale(1.03);
}

/* File / Document Card */
.attachment-card-file .attachment-preview {
  height: 80px;
  background-color: var(--bg-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
}

.file-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.attachment-info {
  padding: 0.5rem 0.625rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  font-size: 0.75rem;
  background-color: var(--bg-surface);
}

.attachment-filename {
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

.attachment-filename:hover {
  color: var(--primary);
}

.attachment-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.7rem;
}

.attachment-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.attachment-btn-action {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.15rem 0.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  transition: var(--transition);
}

.attachment-btn-action:hover {
  color: var(--primary);
  background-color: var(--bg-subtle);
}

.attachment-btn-del:hover {
  color: var(--danger-solid);
}

/* Lightbox Modal */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.lightbox-modal.active {
  display: flex;
}

.lightbox-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
}

.lightbox-container {
  position: relative;
  z-index: 101;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.lightbox-caption {
  color: white;
  font-size: 0.875rem;
  font-weight: 500;
  background: rgba(0, 0, 0, 0.6);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
}

.lightbox-close {
  position: absolute;
  top: -2.5rem;
  right: 0;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  font-size: 1.25rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.4);
}

/* File Upload input custom styling */
.file-upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  background-color: var(--bg-subtle);
  cursor: pointer;
  transition: var(--transition);
}

.file-upload-zone:hover {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.file-preview-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.file-preview-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.6rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
}