* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Malgun Gothic", sans-serif;
  background: #f4f6f8;
  color: #222;
  display: flex;
  justify-content: center;
  padding: 40px 16px;
}

.container {
  width: 100%;
  max-width: 480px;
  background: #fff;
  border-radius: 12px;
  padding: 28px 24px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

h1 {
  margin: 0 0 20px;
  font-size: 22px;
  text-align: center;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.user-badge {
  font-size: 13px;
  color: #555;
}

.logout-btn {
  border: none;
  background: #f0f2f5;
  color: #555;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
}

.logout-btn:hover {
  background: #e4e7eb;
}

.auth-container {
  max-width: 380px;
}

.auth-subtitle {
  margin: 0 0 20px;
  text-align: center;
  font-size: 13px;
  color: #777;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-form label {
  font-size: 12px;
  color: #555;
  margin-top: 8px;
}

.auth-form input {
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 14px;
}

.auth-form button {
  margin-top: 18px;
  padding: 11px 16px;
  border: none;
  border-radius: 8px;
  background: #4a6cf7;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.auth-form button:hover {
  background: #3a58d6;
}

.auth-switch {
  margin: 18px 0 0;
  text-align: center;
  font-size: 13px;
  color: #666;
}

.auth-switch a {
  color: #4a6cf7;
  text-decoration: none;
  font-weight: 600;
}

.flash {
  background: #fff4e5;
  border: 1px solid #ffdca8;
  color: #8a5a00;
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: 13px;
}

.flash p {
  margin: 0;
}

.add-form {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.add-form input[type="text"] {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 14px;
}

.add-form button {
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  background: #4a6cf7;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.add-form button:hover {
  background: #3a58d6;
}

.stats {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: #666;
  margin-bottom: 12px;
}

.filters {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.filters a {
  flex: 1;
  text-align: center;
  padding: 6px 0;
  border-radius: 6px;
  text-decoration: none;
  font-size: 13px;
  color: #555;
  background: #f0f2f5;
}

.filters a.active {
  background: #4a6cf7;
  color: #fff;
}

.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.todo-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 6px;
  border-bottom: 1px solid #eee;
  flex-wrap: wrap;
}

.todo-list li.empty {
  justify-content: center;
  color: #999;
  font-size: 13px;
  padding: 24px 0;
}

.toggle-form {
  margin: 0;
}

.check-btn {
  border: none;
  background: none;
  font-size: 18px;
  cursor: pointer;
  padding: 0;
}

.title {
  flex: 1;
  font-size: 14px;
  word-break: break-all;
}

.todo-list li.done .title {
  text-decoration: line-through;
  color: #aaa;
}

.actions {
  display: flex;
  gap: 6px;
}

.actions button {
  border: none;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 12px;
  cursor: pointer;
}

.edit-btn {
  background: #eef1ff;
  color: #4a6cf7;
}

.delete-btn {
  background: #ffefef;
  color: #e64545;
}

.edit-form {
  display: none;
  width: 100%;
  gap: 8px;
  margin-top: 8px;
}

.edit-form.open {
  display: flex;
}

.edit-form input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 13px;
}

.edit-form button {
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  background: #4a6cf7;
  color: #fff;
  font-size: 13px;
  cursor: pointer;
}

.clear-form {
  margin-top: 16px;
  text-align: center;
}

.clear-form button {
  border: none;
  background: none;
  color: #999;
  font-size: 12px;
  text-decoration: underline;
  cursor: pointer;
}