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

:root {
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #4338ca;
  --primary-bg: #eef2ff;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --info: #3b82f6;
  --info-bg: #eff6ff;

  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --sidebar-w: 340px;
  --topbar-h: 56px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== Topbar ===== */
.topbar {
  height: var(--topbar-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-left .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  color: var(--primary);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.github-status {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  background: var(--border-light);
  color: var(--text-secondary);
}

.github-status .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.github-status.ok .status-dot { background: var(--success); }
.github-status.ok { background: var(--success-bg); color: var(--success); }
.github-status.err .status-dot { background: var(--warning); }
.github-status.err { background: var(--warning-bg); color: var(--warning); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--border-light); color: var(--text); }

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}
.btn-danger:hover { background: var(--danger-bg); }

.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-xs { padding: 3px 8px; font-size: 11px; }

/* ===== Stats Bar ===== */
.stats-bar {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.stat-card {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
}

.stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ===== Main Layout ===== */
.main-layout {
  display: flex;
  height: calc(100vh - var(--topbar-h) - 85px);
}

.req-sidebar {
  width: var(--sidebar-w);
  border-right: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.search-input, .filter-select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.search-input:focus, .filter-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.req-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.req-list .loading {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
}

/* ===== Requirement Card ===== */
.req-card {
  padding: 12px 14px;
  border-radius: var(--radius);
  margin-bottom: 6px;
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
}

.req-card:hover {
  background: var(--border-light);
}

.req-card.active {
  background: var(--primary-bg);
  border-color: var(--primary);
}

.req-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
}

.req-card-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.req-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--text-muted);
}

.req-card-code {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 11px;
  color: var(--primary);
  font-weight: 600;
}

/* ===== Status Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}

.badge-draft { background: #f1f5f9; color: #64748b; }
.badge-scheduled { background: #e0e7ff; color: #4338ca; }
.badge-in_progress { background: #dbeafe; color: #2563eb; }
.badge-testing { background: #fef3c7; color: #d97706; }
.badge-done { background: #d1fae5; color: #059669; }
.badge-archived { background: #f1f5f9; color: #94a3b8; }

.priority-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.priority-low { background: #94a3b8; }
.priority-medium { background: #3b82f6; }
.priority-high { background: #f59e0b; }
.priority-urgent { background: #ef4444; }

/* ===== Detail Panel ===== */
.req-detail {
  flex: 1;
  overflow-y: auto;
  background: var(--bg);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  gap: 8px;
}

.empty-state svg { opacity: 0.3; }
.empty-state p { font-size: 14px; }
.empty-state .empty-hint { font-size: 12px; }

.detail-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 24px;
}

.detail-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.detail-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.detail-code {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
}

.detail-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.detail-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.detail-actions {
  display: flex;
  gap: 8px;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.tab {
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
  position: relative;
}

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

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-badge {
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 10px;
  background: var(--primary-bg);
  color: var(--primary);
}

.tab-content {
  padding: 20px 24px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== Info Grid ===== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 800px;
}

.info-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.info-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-value {
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}

.info-value.mono {
  font-family: "SF Mono", "Fira Code", monospace;
}

/* ===== Branch Cards ===== */
.branch-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.branch-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.branch-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  transition: box-shadow 0.15s;
}

.branch-card:hover { box-shadow: var(--shadow-md); }

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

.branch-repo-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}

.branch-name-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 13px;
}

.branch-name-text {
  color: var(--primary);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 11px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.copy-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.copy-btn.copied {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.branch-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 8px;
}

.branch-status-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
}

.branch-status-tag.created { background: var(--success-bg); color: var(--success); }
.branch-status-tag.local { background: var(--border-light); color: var(--text-secondary); }

.clone-cmd {
  margin-top: 8px;
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.clone-cmd .cmd-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===== Checklist / Notes ===== */
.checklist-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.checklist-section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}

.checklist-item:last-child { border-bottom: none; }

.checklist-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 180px;
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
}

.checklist-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.checklist-content {
  flex: 1;
}

.checklist-content textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: "SF Mono", "Fira Code", monospace;
  background: var(--bg);
  color: var(--text);
  outline: none;
  resize: vertical;
  min-height: 80px;
  transition: border-color 0.15s;
}

.checklist-content textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.checklist-content input[type="text"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  outline: none;
}

.checklist-content input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.checklist-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Modal ===== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  align-items: flex-start;
  justify-content: center;
  padding-top: 80px;
}

.modal-overlay.show {
  display: flex;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  width: 520px;
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.2s ease;
}

.modal-lg { width: 760px; }

@keyframes modalIn {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 22px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.modal-close:hover { background: var(--border-light); color: var(--text); }

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.form-group .required { color: var(--danger); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.form-row {
  display: flex;
  gap: 12px;
}

.form-row .form-group { flex: 1; }
.flex-1 { flex: 1; }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.form-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Repo List in Modal ===== */
.repo-add-form {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}

.repo-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.repo-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.repo-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.repo-item-name {
  font-weight: 600;
  font-size: 13px;
}

.repo-item-path {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 12px;
  color: var(--text-secondary);
}

.search-results {
  position: relative;
}

.search-results-dropdown {
  position: absolute;
  top: 4px;
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  max-height: 200px;
  overflow-y: auto;
  z-index: 10;
}

.search-result-item {
  padding: 8px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-light);
  font-size: 13px;
}

.search-result-item:hover { background: var(--primary-bg); }
.search-result-item:last-child { border-bottom: none; }

.search-result-item .repo-full-name {
  font-family: "SF Mono", "Fira Code", monospace;
  font-weight: 500;
}

.search-result-item .repo-desc {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  top: 70px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.2s ease;
  min-width: 200px;
}

.toast.success { background: var(--success); color: #fff; }
.toast.error { background: var(--danger); color: #fff; }
.toast.info { background: var(--info); color: #fff; }

@keyframes toastIn {
  from { transform: translateX(100px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .info-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-wrap: wrap; }
  .stat-card { min-width: calc(50% - 8px); }
}