:root {
  --color-primary: #534AB7;
  --color-primary-light: #EEEDFE;
  --color-primary-dark: #3C3489;
  --color-bg: #F5F4F0;
  --color-surface: #FFFFFF;
  --color-text: #2C2C2A;
  --color-text-secondary: #888780;
  --color-border: #E0DED8;
  --color-todo: #888780;
  --color-progress: #185FA5;
  --color-done: #3B6D11;
  --color-blocked: #A32D2D;
  --color-high: #A32D2D;
  --color-medium: #854F0B;
  --color-low: #888780;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-hover: 0 2px 8px rgba(0,0,0,0.12);
}

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

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

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.header-left { display: flex; align-items: baseline; gap: 12px; }

.logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.last-updated {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.header-stats {
  display: flex;
  gap: 16px;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  background: var(--color-bg);
  border-radius: 20px;
  font-size: 12px;
}

.stat-pill .num { font-weight: 600; font-size: 14px; }
.stat-pill .label { color: var(--color-text-secondary); }

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

.tab {
  padding: 12px 20px;
  border: none;
  background: none;
  font-size: 14px;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

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

.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 500;
}

.main { padding: 24px; max-width: 1200px; margin: 0 auto; }

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

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.filter-group { display: flex; gap: 4px; }

.filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 20px;
  font-size: 13px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }

.filter-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.sort-select {
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 13px;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

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

.todo-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
  cursor: pointer;
}

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

.todo-checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.todo-checkbox.checked {
  background: var(--color-done);
  border-color: var(--color-done);
}

.todo-checkbox.checked::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-top: -2px;
}

.todo-content { flex: 1; min-width: 0; }

.todo-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 2px;
}

.todo-card.done .todo-title {
  text-decoration: line-through;
  color: var(--color-text-secondary);
}

.todo-description {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.todo-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}

.tag-priority-high { background: #FCEBEB; color: var(--color-high); }
.tag-priority-medium { background: #FAEEDA; color: var(--color-medium); }
.tag-priority-low { background: #F1EFE8; color: var(--color-low); }

.tag-status-todo { background: #F1EFE8; color: var(--color-todo); }
.tag-status-inProgress { background: #E6F1FB; color: var(--color-progress); }
.tag-status-done { background: #EAF3DE; color: var(--color-done); }
.tag-status-blocked { background: #FCEBEB; color: var(--color-blocked); }

.tag-source {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.tag-due {
  background: #F1EFE8;
  color: var(--color-text-secondary);
}

.tag-overdue {
  background: #FCEBEB;
  color: var(--color-blocked);
}

.milestone-card {
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.milestone-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.milestone-title { font-size: 15px; font-weight: 500; }

.milestone-due { font-size: 12px; color: var(--color-text-secondary); }

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-bg);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-text-secondary);
}

.milestone-desc {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 6px;
}

.decision-card {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.decision-date {
  flex-shrink: 0;
  width: 60px;
  text-align: center;
  padding: 8px;
  background: var(--color-primary-light);
  border-radius: var(--radius);
}

.decision-date .month { font-size: 11px; color: var(--color-primary); }
.decision-date .day { font-size: 18px; font-weight: 600; color: var(--color-primary-dark); }

.decision-content { flex: 1; }
.decision-title { font-size: 14px; font-weight: 500; margin-bottom: 4px; }
.decision-rationale { font-size: 12px; color: var(--color-text-secondary); }

.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.overview-card {
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.overview-card .big-num {
  font-size: 32px;
  font-weight: 600;
  color: var(--color-primary);
}

.overview-card .label {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.overview-section {
  margin-bottom: 24px;
}

.overview-section h3 {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 12px;
  color: var(--color-text);
}

.project-info {
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.project-info h3 { font-size: 16px; margin-bottom: 8px; }
.project-info p { font-size: 13px; color: var(--color-text-secondary); margin-bottom: 4px; }

.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: center;
  justify-content: center;
}

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

.modal {
  background: var(--color-surface);
  border-radius: 12px;
  width: 90%;
  max-width: 480px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.16);
}

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

.modal-header h3 { font-size: 16px; font-weight: 500; }

.modal-close {
  border: none;
  background: none;
  font-size: 22px;
  color: var(--color-text-secondary);
  cursor: pointer;
  line-height: 1;
}

.modal-body { padding: 20px; }

.form-group { margin-bottom: 14px; }

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  background: var(--color-surface);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--color-border);
}

.btn {
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

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

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
}

.btn-secondary:hover { background: var(--color-border); }

.toast {
  display: none;
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  background: var(--color-text);
  color: white;
  border-radius: var(--radius);
  font-size: 13px;
  z-index: 2000;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.toast.active { display: block; animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--color-text-secondary);
}

.error-state {
  text-align: center;
  padding: 40px;
  color: var(--color-blocked);
  font-size: 14px;
}

.add-btn {
  padding: 6px 16px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s;
}

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

.settings-link {
  font-size: 12px;
  color: var(--color-text-secondary);
  cursor: pointer;
  text-decoration: underline;
}

@media (max-width: 768px) {
  .header { flex-direction: column; gap: 8px; align-items: flex-start; }
  .header-stats { flex-wrap: wrap; }
  .toolbar { flex-direction: column; align-items: stretch; }
  .form-row { flex-direction: column; }
}