:root {
  --gitlab-orange: #fc6d26;
  --gitlab-orange-dark: #e24329;
  --gitlab-blue: #1f75cb;
  --gitlab-blue-light: #428fdc;
  --gitlab-green: #108548;
  --gitlab-red: #c9190b;
  --gitlab-yellow: #f5c542;
  --gitlab-purple: #6e49cb;
  --gitlab-gray-50: #fafafa;
  --gitlab-gray-100: #f0f0f0;
  --gitlab-gray-200: #dbdbdb;
  --gitlab-gray-300: #bfbfbf;
  --gitlab-gray-500: #737278;
  --gitlab-gray-700: #535158;
  --gitlab-gray-900: #333238;
  --header-height: 48px;
  --column-width: 300px;
  --border-radius: 4px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.12);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

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

html, body {
  height: 100%;
  font-family: var(--font-family);
  font-size: 14px;
  color: var(--gitlab-gray-900);
  background: var(--gitlab-gray-50);
  overflow: hidden;
}

/* Header estilo GitLab */
.app-header {
  height: var(--header-height);
  background: #292961;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
}

.header-logo svg {
  width: 28px;
  height: 28px;
}

.header-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.2);
}

.header-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
}

.header-breadcrumb span {
  color: rgba(255, 255, 255, 0.6);
}

.header-breadcrumb strong {
  color: #fff;
  font-weight: 600;
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
  white-space: nowrap;
}

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

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn-danger {
  background: var(--gitlab-red);
  color: #fff;
  border-color: var(--gitlab-red);
}

.btn-danger:hover {
  background: #a4160a;
}

.btn-outline {
  background: #fff;
  color: var(--gitlab-gray-700);
  border-color: var(--gitlab-gray-200);
}

.btn-outline:hover {
  background: var(--gitlab-gray-100);
}

/* Sub-header com tabs */
.sub-header {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  height: 40px;
  background: #fff;
  border-bottom: 1px solid var(--gitlab-gray-200);
  display: flex;
  align-items: center;
  padding: 0 16px;
  z-index: 99;
}

.sub-header-tabs {
  display: flex;
  gap: 0;
  height: 100%;
}

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 16px;
  height: 100%;
  color: var(--gitlab-gray-500);
  font-size: 13px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s;
}

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

.tab:hover:not(.active) {
  color: var(--gitlab-gray-700);
}

.board-stats {
  margin-left: auto;
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--gitlab-gray-500);
}

.board-stats strong {
  color: var(--gitlab-gray-900);
}

/* Board container */
.board-wrapper {
  position: fixed;
  top: calc(var(--header-height) + 40px);
  left: 0;
  right: 0;
  bottom: 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 16px;
}

.board {
  display: flex;
  gap: 12px;
  height: 100%;
  min-width: max-content;
}

/* Colunas */
.column {
  width: var(--column-width);
  min-width: var(--column-width);
  display: flex;
  flex-direction: column;
  background: var(--gitlab-gray-100);
  border-radius: var(--border-radius);
  max-height: 100%;
}

.column-header {
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--gitlab-gray-200);
  flex-shrink: 0;
}

.column-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.column-indicator.backlog { background: var(--gitlab-gray-500); }
.column-indicator.a_fazer { background: var(--gitlab-blue); }
.column-indicator.em_andamento { background: var(--gitlab-orange); }
.column-indicator.impedimento { background: var(--gitlab-red); }
.column-indicator.revisao { background: var(--gitlab-purple); }
.column-indicator.entregue { background: var(--gitlab-green); }

.column-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--gitlab-gray-900);
  flex: 1;
}

.column-count {
  background: var(--gitlab-gray-200);
  color: var(--gitlab-gray-700);
  font-size: 11px;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 10px;
  min-width: 22px;
  text-align: center;
}

.column-add-btn {
  background: none;
  border: none;
  color: var(--gitlab-gray-500);
  cursor: pointer;
  padding: 2px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.column-add-btn:hover {
  background: var(--gitlab-gray-200);
  color: var(--gitlab-gray-900);
}

.column-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 60px;
}

.column-body.drag-over {
  background: rgba(31, 117, 203, 0.08);
  outline: 2px dashed var(--gitlab-blue-light);
  outline-offset: -2px;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* Cards estilo GitLab Issue */
.card {
  background: #fff;
  border: 1px solid var(--gitlab-gray-200);
  border-radius: var(--border-radius);
  padding: 10px 12px;
  cursor: grab;
  transition: box-shadow 0.15s, transform 0.15s, opacity 0.15s;
  box-shadow: var(--shadow-sm);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--gitlab-gray-300);
}

.card.dragging {
  opacity: 0.5;
  cursor: grabbing;
  transform: rotate(2deg);
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 6px;
}

.card-id {
  color: var(--gitlab-gray-500);
  font-size: 12px;
  font-weight: 500;
  flex-shrink: 0;
}

.card-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--gitlab-gray-900);
  line-height: 1.4;
  word-break: break-word;
}

.card-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.label {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  line-height: 18px;
}

.label-bug { background: #c9190b; }
.label-feature { background: #1f75cb; }
.label-melhoria { background: #6e49cb; }
.label-urgente { background: #fc6d26; }
.label-documentacao { background: #108548; }

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.priority-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 11px;
  font-weight: 500;
  color: var(--gitlab-gray-500);
}

.priority-badge.critica { color: var(--gitlab-red); }
.priority-badge.alta { color: var(--gitlab-orange); }
.priority-badge.media { color: var(--gitlab-blue); }
.priority-badge.baixa { color: var(--gitlab-gray-500); }

.assignee {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gitlab-blue);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--gitlab-gray-200);
}

.assignee.empty {
  background: var(--gitlab-gray-200);
  color: var(--gitlab-gray-500);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: #fff;
  border-radius: 6px;
  width: 520px;
  max-width: 95vw;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transform: translateY(20px);
  transition: transform 0.2s;
}

.modal-overlay.open .modal {
  transform: translateY(0);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gitlab-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--gitlab-gray-500);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  border-radius: var(--border-radius);
}

.modal-close:hover {
  background: var(--gitlab-gray-100);
  color: var(--gitlab-gray-900);
}

.modal-body {
  padding: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gitlab-gray-700);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--gitlab-gray-200);
  border-radius: var(--border-radius);
  font-size: 14px;
  font-family: inherit;
  color: var(--gitlab-gray-900);
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--gitlab-blue);
  box-shadow: 0 0 0 3px rgba(31, 117, 203, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--gitlab-gray-200);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* Toast notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--gitlab-gray-900);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--border-radius);
  font-size: 13px;
  box-shadow: var(--shadow-md);
  animation: slideIn 0.3s ease;
  max-width: 360px;
}

.toast.success { border-left: 4px solid var(--gitlab-green); }
.toast.error { border-left: 4px solid var(--gitlab-red); }

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

/* Loading */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 150;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--gitlab-gray-200);
  border-top-color: var(--gitlab-orange);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-column {
  text-align: center;
  padding: 24px 12px;
  color: var(--gitlab-gray-500);
  font-size: 12px;
}

/* Scrollbar */
.column-body::-webkit-scrollbar,
.board-wrapper::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.column-body::-webkit-scrollbar-track,
.board-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.column-body::-webkit-scrollbar-thumb,
.board-wrapper::-webkit-scrollbar-thumb {
  background: var(--gitlab-gray-300);
  border-radius: 3px;
}

.column-body::-webkit-scrollbar-thumb:hover,
.board-wrapper::-webkit-scrollbar-thumb:hover {
  background: var(--gitlab-gray-500);
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --column-width: 280px;
  }

  .header-breadcrumb,
  .board-stats {
    display: none;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}