/**
 * Kanban App Styles
 * 
 * This stylesheet contains all styles for the Kanban application.
 * It includes light/dark theme support, responsive design, and
 * component-specific styles.
 * 
 * @author JSL Portfolio
 * @version 1.0.0
 */

/* ==========================================================================
   CSS Variables (Design Tokens)
   ========================================================================== */

:root {
  /* Primary Colors */
  --primary: #635FC7;
  --primary-hover: #A8A4FF;
  
  /* Destructive Colors */
  --destructive: #EA5555;
  --destructive-hover: #FF9898;
  
  /* Light Theme Colors */
  --bg-primary: #F4F7FD;
  --bg-secondary: #FFFFFF;
  --text-primary: #000112;
  --text-secondary: #828FA3;
  --border-color: #E4EBFA;
  --lines: #E4EBFA;
  
  /* Column Dot Colors */
  --todo-color: #49C4E5;
  --doing-color: #8471F2;
  --done-color: #67E2AE;
  
  /* Spacing */
  --sidebar-width: 260px;
  --header-height-mobile: 64px;
  --header-height-desktop: 80px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Dark Theme */
.dark {
  --bg-primary: #20212C;
  --bg-secondary: #2B2C37;
  --text-primary: #FFFFFF;
  --text-secondary: #828FA3;
  --border-color: #3E3F4E;
  --lines: #3E3F4E;
}

/* ==========================================================================
   Base Styles & Reset
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.hidden {
  display: none !important;
}

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

/* ==========================================================================
   App Container
   ========================================================================== */

.app-container {
  display: flex;
  min-height: 100vh;
}

/* ==========================================================================
   Logo Component
   ========================================================================== */

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

.logo-icon {
  display: flex;
  align-items: flex-end;
  gap: 3px;
}

.logo-bar {
  width: 6px;
  border-radius: var(--radius-full);
  background-color: var(--primary);
}

.logo-bar-1 {
  height: 21px;
}

.logo-bar-2 {
  height: 15px;
  opacity: 0.75;
}

.logo-bar-3 {
  height: 9px;
  opacity: 0.5;
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.sidebar {
  display: none;
  flex-direction: column;
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  flex-shrink: 0;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

@media (min-width: 768px) {
  .sidebar {
    display: flex;
  }
  
  .sidebar.hidden {
    display: none !important;
  }
}

.sidebar-logo {
  display: flex;
  align-items: center;
  height: var(--header-height-desktop);
  padding: 0 24px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-boards {
  flex: 1;
  padding-top: 16px;
  overflow-y: auto;
}

.boards-title {
  padding: 0 24px;
  margin-bottom: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.4px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.boards-nav {
  padding-right: 24px;
}

.board-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.board-item:hover {
  background-color: var(--primary-hover);
  color: var(--primary);
}

.board-item.active {
  background-color: var(--primary);
  color: #FFFFFF;
}

.board-item.active:hover {
  background-color: var(--primary);
  color: #FFFFFF;
}

.board-icon {
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ==========================================================================
   Theme Toggle
   ========================================================================== */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 14px;
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-normal);
}

.theme-icon {
  flex-shrink: 0;
}

.toggle-switch {
  position: relative;
  width: 40px;
  height: 20px;
  background-color: var(--primary);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.toggle-switch:hover {
  background-color: var(--primary-hover);
}

.toggle-slider {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  background-color: #FFFFFF;
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.toggle-switch[aria-checked="true"] .toggle-slider {
  transform: translateX(20px);
}

/* ==========================================================================
   Hide/Show Sidebar Buttons
   ========================================================================== */

.hide-sidebar-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 24px;
  margin-left: -8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: color var(--transition-fast);
}

.hide-sidebar-btn:hover {
  color: var(--primary);
}

.hide-sidebar-btn svg {
  flex-shrink: 0;
}

.show-sidebar-btn {
  position: fixed;
  bottom: 32px;
  left: 0;
  display: none;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 48px;
  background-color: var(--primary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: background-color var(--transition-fast);
}

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

@media (min-width: 768px) {
  .show-sidebar-btn:not(.hidden) {
    display: flex;
  }
}

/* ==========================================================================
   Main Content Area
   ========================================================================== */

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
  display: flex;
  align-items: center;
  gap: 16px;
  height: var(--header-height-mobile);
  padding: 0 16px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

@media (min-width: 768px) {
  .header {
    height: var(--header-height-desktop);
    padding: 0 24px;
  }
}

.mobile-logo-btn {
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (min-width: 768px) {
  .mobile-logo-btn {
    display: none;
  }
}

.chevron-down {
  transition: transform var(--transition-fast);
}

.mobile-logo-btn.active .chevron-down {
  transform: rotate(180deg);
}

.header-logo {
  display: none;
  align-items: center;
  height: 100%;
  padding-right: 24px;
  margin-right: 24px;
  border-right: 1px solid var(--border-color);
}

@media (min-width: 768px) {
  .header-logo:not(.hidden) {
    display: flex;
  }
}

.board-title {
  flex: 1;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 768px) {
  .board-title {
    font-size: 20px;
  }
}

@media (min-width: 1024px) {
  .board-title {
    font-size: 24px;
  }
}

.add-task-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  background-color: var(--primary);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

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

.add-task-text {
  display: none;
}

@media (min-width: 640px) {
  .add-task-text {
    display: inline;
  }
}

/* ==========================================================================
   Board Area
   ========================================================================== */

.board {
  flex: 1;
  overflow: auto;
  padding: 24px;
}

/* Loading State */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 16px;
  color: var(--text-secondary);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Error State */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 12px;
  text-align: center;
}

.error-message {
  font-size: 16px;
  font-weight: 600;
  color: var(--destructive);
}

.error-details {
  font-size: 14px;
  color: var(--text-secondary);
}

.retry-btn {
  margin-top: 8px;
  padding: 10px 20px;
  background-color: transparent;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  border: 1px solid var(--primary);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.retry-btn:hover {
  background-color: var(--primary);
  color: #FFFFFF;
}

/* ==========================================================================
   Columns
   ========================================================================== */

.columns-container {
  display: flex;
  gap: 24px;
  height: 100%;
  min-height: 0;
}

.column {
  display: flex;
  flex-direction: column;
  width: 280px;
  min-width: 280px;
  flex-shrink: 0;
}

.column-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.column-dot {
  width: 15px;
  height: 15px;
  border-radius: 50%;
}

.todo-dot {
  background-color: var(--todo-color);
}

.doing-dot {
  background-color: var(--doing-color);
}

.done-dot {
  background-color: var(--done-color);
}

.column-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.4px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.tasks-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex: 1;
  overflow-y: auto;
  padding-bottom: 24px;
}

.tasks-list:empty::after {
  content: '';
  display: block;
  min-height: 120px;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Task Card
   ========================================================================== */

.task-card {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 23px 16px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 6px rgba(54, 78, 126, 0.1);
  cursor: pointer;
  transition: background-color var(--transition-normal), transform var(--transition-fast);
}

.task-card:hover {
  transform: translateY(-2px);
}

.task-card:hover .task-title {
  color: var(--primary);
}

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

.task-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  transition: color var(--transition-fast);
}

.task-subtasks {
  margin-top: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
}

/* Priority Indicator */
.priority-indicator {
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-top: 4px;
}

.priority-high {
  background-color: #EA5555;
}

.priority-medium {
  background-color: #F5A623;
}

.priority-low {
  background-color: #67E2AE;
}

/* ==========================================================================
   Mobile Menu
   ========================================================================== */

.mobile-menu-overlay {
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 100;
  display: flex;
  justify-content: center;
  padding-top: 16px;
}

.mobile-menu {
  width: 264px;
  max-height: fit-content;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 16px 0;
  box-shadow: 0 10px 20px rgba(54, 78, 126, 0.25);
}

.mobile-menu .boards-title {
  padding: 0 24px;
  margin-bottom: 20px;
}

.mobile-menu .boards-nav {
  padding-right: 24px;
  margin-bottom: 16px;
}

.mobile-menu .theme-toggle {
  margin: 0 16px;
}

@media (min-width: 768px) {
  .mobile-menu-overlay {
    display: none !important;
  }
}

/* ==========================================================================
   Modal Base Styles
   ========================================================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 480px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: 0 10px 20px rgba(54, 78, 126, 0.25);
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close-btn {
  flex-shrink: 0;
  padding: 4px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--destructive);
}

/* ==========================================================================
   Form Styles
   ========================================================================== */

.task-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

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

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.form-textarea {
  resize: none;
  line-height: 1.6;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='7' viewBox='0 0 10 7' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%23635FC7' stroke-width='2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

.submit-btn {
  width: 100%;
  padding: 12px;
  background-color: var(--primary);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

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

.delete-btn {
  width: 100%;
  padding: 12px;
  margin-top: 16px;
  background-color: var(--destructive);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.delete-btn:hover {
  background-color: var(--destructive-hover);
}

/* ==========================================================================
   Delete Confirmation Modal
   ========================================================================== */

.delete-modal-content {
  text-align: left;
}

.delete-modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--destructive);
  margin-bottom: 24px;
}

.delete-modal-message {
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.delete-modal-actions {
  display: flex;
  gap: 16px;
}

.confirm-delete-btn,
.cancel-delete-btn {
  flex: 1;
  padding: 12px;
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.confirm-delete-btn {
  background-color: var(--destructive);
  color: #FFFFFF;
}

.confirm-delete-btn:hover {
  background-color: var(--destructive-hover);
}

.cancel-delete-btn {
  background-color: rgba(99, 95, 199, 0.1);
  color: var(--primary);
}

.dark .cancel-delete-btn {
  background-color: #FFFFFF;
}

.cancel-delete-btn:hover {
  background-color: rgba(99, 95, 199, 0.25);
}

.dark .cancel-delete-btn:hover {
  background-color: #FFFFFF;
}

/* ==========================================================================
   Scrollbar Styles
   ========================================================================== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ==========================================================================
   Focus Styles (Accessibility)
   ========================================================================== */

*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}