/* ビューポート対応 */
html {
  box-sizing: border-box;
}
*, *::before, *::after {
  box-sizing: inherit;
}

/* 入力要素初期化 */
input[type="date"] {
  appearance: auto;
  -webkit-appearance: auto;
}

/* 見出し */
h1 {
  font-size: 28px;
  color: #1f4e79;
  background: linear-gradient(to right, #e6f0fa, #ffffff);
  padding: 10px 15px;
  border-left: 6px solid #4a90e2;
  border-radius: 4px;
  box-shadow: 1px 1px 5px rgba(0, 80, 180, 0.1);
  margin-bottom: 20px;
}

/* レイアウト全体 */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  font-family: "Segoe UI", sans-serif;
  color: #333;
}

/* フォーム */
#taskForm {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 20px;
}

#taskForm input[type="text"],
#taskForm input[type="date"],
#taskForm select {
  flex: 1 1 100px;
  min-width: 0;
  padding: 10px 14px;
  font-size: 16px;
  border-radius: 6px;
  border: 1px solid #ccc;
  background-color: #f0f8ff;
}

#taskForm label {
  display: flex;
  flex-direction: column;
  font-size: 14px;
  color: #1f4e79;
}

#taskForm button {
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 6px;
  background-color: #1f75fe;
  color: white;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

#taskForm button:hover {
  background-color: #155fcf;
}

/* ボタンエリア */
.task-buttons {
  display: flex;
  gap: 50px;
  margin-right: auto;
  margin-top: 8px;
}

.task-buttons button {
  flex-shrink: 0;
}

/* タスク要素 */
.task {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding: 10px;
  margin: 6px 0;
  border: 1px solid #cce0f5;
  border-radius: 6px;
  background-color: #e9f3ff;
  box-shadow: 1px 1px 3px rgba(0, 100, 200, 0.1);
  transition: background-color 0.3s ease, transform 0.2s ease;
  animation: fadeSlideIn 0.3s ease-out;
}

.task:hover {
  transform: scale(1.01);
}

.task span {
  margin-right: 12px;
  font-size: 15px;
}

.task.completed {
  background-color: #f3f3f3;
  text-decoration: line-through;
  color: #999;
}

.task.completed .title {
  position: relative;
  display: inline-block;
}

.task.completed .title::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 2px;
  background: #999;
  transform: scaleX(0);
  transform-origin: left;
  animation: lineThrough 0.3s forwards;
}

.task button {
  margin-left: auto;
  padding: 6px 12px;
  font-size: 14px;
  background-color: #1f75fe;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.task button:hover {
  background-color: #155fcf;
}

/* タスクリスト構造 */
.task-columns {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 30px;
}

.task-section {
  flex: 1 1 45%;
  min-width: 300px;
}

.taskList {
  min-height: 200px;
  padding: 12px;
  border: 2px dashed #aacbe2;
  border-radius: 8px;
  background-color: #f9fcff;
  transition: background-color 0.3s ease;
}

.taskList.dragover {
  background-color: #e0f3ff;
  border-color: #4a90e2;
}

.taskList .task {
  width: 100%;
}

.task-section h2 {
  font-size: 20px;
  margin-bottom: 10px;
  color: #1f4e79;
  border-left: 4px solid #4a90e2;
  padding-left: 8px;
}

/* チェックボックスフォーム */
.task-checkboxes {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background-color: #f4f9ff;
  border-radius: 8px;
  border: 1px solid #cce0f5;
  min-height: 48px;
}

.task-checkboxes.dummy {
  opacity: 0;
  pointer-events: none;
  user-select: none;
}

#checkboxes-sort {
  background-color: #e3f2fd;
  color: #1f4e79;
  font-weight: bold;
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 14px;
  border: 1px solid #90caf9;
}

.task-checkboxes label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
}

.task-checkboxes input[type="checkbox"] {
  transform: scale(1.1);
}

/* セレクトボックス */
select {
  padding: 10px 12px;
  font-size: 14px;
  border: 1px solid #aacbe2;
  border-radius: 6px;
  background-color: #f0f8ff;
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg fill='%23666' height='12' viewBox='0 0 24 24' width='12' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 12px;
  cursor: pointer;
}

select:hover {
  border-color: #7fa7d4;
}

select:focus {
  outline: none;
  border-color: #4a90e2;
  box-shadow: 0 0 4px rgba(74, 144, 226, 0.6);
}

.dueDate {
  white-space: nowrap;
  display: inline-block;
  font-size: 15px;
  margin-right: 12px;
}

.priority-container {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.priority::before {
  content: attr(data-priority);
  display: inline-block;
  padding: 4px 8px;
  border-radius: 15px;
  font-size: 12px;
  color: white;
  margin-right: 6px;
  white-space: nowrap;
}

.priority {
  display: inline-flex;
  align-items: center;
  margin-left: 8px;
}

.priority[data-priority="High"]::before {
  background-color: #3206f7;
}
.priority[data-priority="Medium"]::before {
  background-color: #4e74c5;
}
.priority[data-priority="Low"]::before {
  background-color: #7cbcf1;
}

.account-links {
  margin-top: 40px;
  text-align: center;
  font-size: 14px;
}

.account-link {
  margin: 0 10px;
  color: #1f75fe;
  text-decoration: none;
  font-weight: bold;
  transition: color 0.2s ease;
}

.account-link:hover {
  text-decoration: underline;
  color: #155fcf;
}

.account-link.delete {
  color: #e03131;
}

.account-link.delete:hover {
  color: #a60e0e;
}

.error-messages {
  color: #e03131;
  margin: 10px 0;
  font-size: 16px;
  font-weight: 500;
}

.praise-message {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #3f86f1;
  color: white;
  padding: 1rem 2rem;
  border-radius: 2rem;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  z-index: 9999;
  animation: fadeInOut 11s ease-out;
}

@keyframes fadeInOut {
  0%   { opacity: 0; transform: translateY(20px); }
  10%  { opacity: 1; transform: translateY(0); }
  90%  { opacity: 1; }
  100% { opacity: 0; transform: translateY(20px); }
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes lineThrough {
  to {
    transform: scaleX(1);
  }
}

/* モバイル対応 */
@media (max-width: 600px) {
  .task {
    flex-direction: column;
    align-items: flex-start;
  }

  .task button {
    margin-left: 0;
    margin-top: 8px;
  }

  #taskForm {
    flex-direction: column;
    align-items: stretch;
  }

  .task-columns {
    flex-direction: column;
  }

  #taskForm input,
  #taskForm select,
  #taskForm button {
    width: 100%;
  }

  .task-checkboxes.dummy {
    display: none;
  }
}

@media (min-width: 1600px) {
  .container {
    max-width: 1400px;
  }
}

@media (min-width: 1920px) {
  .container {
    max-width: 1700px;
  }
}