body {
  font-family: Arial, sans-serif;
  background-color: #2b2c37;
  color: #ffffff;
  margin: 0;
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
}

.sidebar {
  background: #1e1f29;
  padding: 20px;
  width: 200px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: white;
  transition: transform 0.3s ease;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
}

.sidebar.hidden {
  transform: translateX(-100%);
}

.sidebar.open {
  transform: translateX(0);
}

main {
  flex: 1;
  padding: 20px;
  margin-left: 250px;
  transition: margin-left 0.3s ease;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid #3e3f4e;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
  z-index: 1100;
}

.header-buttons {
  display: flex;
  gap: 10px;
}

.add-task {
  background: #635fc7;
  color: white;
  padding: 12px;
  border: none;
  border-radius: 20px;
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: background 0.2s ease;
}

.add-task:hover {
  background: #4b49a4;
}

.add-task i {
  margin-right: 10px;
}

.menu-toggle {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #4c4c4d;
  transition: color 0.2s ease;
}

.menu-toggle:hover {
  color: #635fc7;
}

.kanban-board {
  display: flex;
  gap: 20px;
}

.column {
  flex: 1;
  background: #3e3f4e;
  padding: 15px;
  border-radius: 8px;
  min-height: 200px;
}

.column h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.task {
  background: #635fc7;
  padding: 10px;
  border-radius: 8px;
  margin-top: 10px;
  font-size: 14px;
  color: white;
  cursor: grab;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: transform 0.2s ease, opacity 0.2s ease;
  overflow: hidden;
  align-items: flex-start;
  position: relative;
}

.task span {
  max-width: 15rem;
  overflow: hidden;
  flex-grow: 1;
  word-wrap: break-word;
  line-height: 1.4;
}

.task:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.task:active, .task.dragging {
  opacity: 0.7;
  transform: scale(0.95);
}

.task.todo {
  background: #3498db;
}

.task.doing {
  background: #e67e22;
}

.task.done {
  background: #2ecc71;
}

.del {
  background: transparent;
  color: #e74c3c;
  border: none;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  padding: 5px;
  min-width: 30px;
  text-align: center;
}

.del:hover {
  color: #c0392b;
  transform: scale(1.2);
}

.column.drag-over {
  border: 2px dashed #fff;
}

.sidebar-top {
  display: flex;
  align-items: center;
}

.logo {
  width: 30px;
  margin-right: 10px;
}

nav ul {
  list-style: none;
  padding: 0;
  flex-grow: 1;
}

nav ul li {
  display: flex;
  align-items: center;
  background: #3e3f4e;
  padding: 10px;
  border-radius: 8px;
  margin-top: 10px;
  cursor: pointer;
  transition: background 0.2s ease;
}

nav ul li.active {
  background: #635fc7;
}

nav ul li:hover {
  background: #4b49a4;
}

nav ul li i {
  margin-right: 10px;
}

.create-board {
  font-weight: bold;
  color: #635fc7;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px;
  background: #3e3f4e;
  border-radius: 20px;
}

.theme-toggle i {
  font-size: 20px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #635fc7;
  transition: 0.4s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 4px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #ffffff;
}

input:checked + .slider:before {
  transform: translateX(26px);
  background-color: #635fc7;
}

.hide-sidebar {
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.3s;
  color: white;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
}

.hide-sidebar:hover {
  color: #635fc7;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(43, 44, 55, 0.95);
  backdrop-filter: blur(5px);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid #635fc7;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  width: 300px;
  max-width: 90%;
  color: white;
}

.modal-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal input,
.modal textarea,
.modal select {
  padding: 8px;
  border: 1px solid #635fc7;
  border-radius: 4px;
  background: #2b2c37;
  color: white;
  font-family: Arial, sans-serif;
}

.modal button {
  padding: 10px;
  background: #635fc7;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.modal button:hover {
  background: #4b49a4;
}

.delete-button {
  background: #e74c3c !important;
  margin-top: 10px;
}

.delete-button:hover {
  background: #c0392b !important;
}

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #2ecc71;
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2000;
}

.light-mode {
  background-color: #f4f4f4;
  color: #333;
}

.light-mode .sidebar {
  background: #ffffff;
  color: #333;
}

.light-mode nav ul li {
  background: #e4e4e7;
  color: #333;
}

.light-mode nav ul li.active {
  background: #635fc7;
  color: white;
}

.light-mode nav ul li:hover {
  background: #d3d3d6;
}

.light-mode .theme-toggle {
  background: #e4e4e7;
}

.light-mode .slider {
  background-color: #ccc;
}

.light-mode input:checked + .slider {
  background-color: #635fc7;
}

.light-mode main {
  background-color: #f9f9f9;
  color: #222;
}

.light-mode header {
  border-bottom: 2px solid #ccc;
}

.light-mode .kanban-board {
  background: #f9f9f9;
}

.light-mode .column {
  background: #ddd;
  color: #222;
}

.light-mode .task {
  color: white;
}

.light-mode .add-task {
  background: #635fc7;
  color: white;
}

.light-mode .hide-sidebar {
  color: #333;
}

.light-mode .menu-toggle {
  color: #333;
}

.light-mode .menu-toggle:hover {
  color: #635fc7;
}

.hidden {
  display: none;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: 250px;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  main {
    margin-left: 0;
  }

  .mobile-menu-toggle {
    display: block;
    order: -1;
    margin-right: 10px;
  }

  .kanban-board {
    flex-direction: column;
    gap: 10px;
  }

  .column {
    width: 100%;
  }

  .add-task {
    padding: 8px;
    font-size: 14px;
  }

  header {
    flex-wrap: wrap;
    gap: 10px;
  }

  .task {
    padding-right: 40px;
  }
  
  .del {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    width: 25px;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .del i {
    margin: 0;
  }
}

@media (max-width: 480px) {
  main {
    padding: 10px;
  }

  .modal {
    width: 95%;
  }

  .column h3 {
    font-size: 16px;
  }

  .task {
    font-size: 12px;
  }

  .task span {
    max-width: calc(100% - 30px);
    word-wrap: break-word;
    line-height: 1.4;
    padding-right: 5px;
  }

  .del {
    min-width: 25px;
  }

  .add-task {
    padding: 6px;
    font-size: 12px;
  }

  .mobile-menu-toggle {
    font-size: 20px;
  }
}