/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

html, body {
  width: 100%;
  overflow-x: hidden;
  background-color: #fff7e9;
  color: #333;
}

/* Container */
#container {
  max-width: 600px;
  margin: 40px auto;
  padding: 25px;
  background-color: #fffbf5;
  border-radius: 16px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Logo */
#logo img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* Header Banner */
header#hd {
  position: relative;
  margin-bottom: 25px;
  height: 150px;
  border-radius: 12px;
  overflow: hidden;
}

#header-banner {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Dark mode toggle */
#dark-mode-toggle {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.8);
  border: none;
  cursor: pointer;
  font-size: 24px;
  border-radius: 8px;
  padding: 5px 10px;
}

/* Task input */
#task-input {
  width: 100%;
  padding: 10px;
  border: 2px solid #ffb6b6;
  border-radius: 8px;
  margin-bottom: 10px;
  font-size: 16px;
}

/* Add task button */
#add-task-btn {
  width: 100%;
  padding: 10px;
  background-color: #ff6b6b;
  color: white;
  border: none;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 10px;
}

#add-task-btn:hover {
  background-color: #ff4b5c;
}

/* Section title */
#mn__sect02 h2 {
  font-size: 22px;
  color: #ff6b6b;
  margin-bottom: 10px;
}

/* Task list */
#task-list {
  list-style-type: none;
  padding-left: 0;
}

/* Task item */
.task-item {
  background-color: #fff5f5;
  padding: 14px;
  margin-bottom: 12px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  transition: background-color 0.3s ease, transform 0.2s ease;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
}

.task-item:hover {
  background-color: #ffecec;
  transform: scale(1.01);
}

.task-item span {
  display: block;
  font-size: 18px;
  flex: 1 1 100%;
  margin-bottom: 10px;
}

.task-item.completed span {
  text-decoration: line-through;
  color: #999;
  opacity: 0.7;
}

.complete-btn,
.remove-btn {
  padding: 8px 10px;
  margin-right: 10px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.complete-btn {
  background-color: #6bcb77;
  color: white;
}

.remove-btn {
  background-color: #ffd93d;
  color: #333;
}

/* Error message */
.error-msg {
  color: #ff4b5c;
  font-size: 14px;
  font-weight: 600;
}

.hidden {
  display: none;
}

/* Footer */
footer#ft {
  text-align: center;
  font-size: 14px;
  margin-top: 30px;
  color: #888;
}

/* 🌙 Dark Mode */
#container.dark-mode {
  background-color: #1e1e2f;
  color: #eee;
}

#container.dark-mode #task-input {
  background-color: #333;
  border-color: #555;
  color: #eee;
}

#container.dark-mode #task-input::placeholder {
  color: #aaa;
}

#container.dark-mode #add-task-btn {
  background-color: #4a90e2;
}

#container.dark-mode #mn__sect02 h2 {
  color: #4a90e2;
}

#container.dark-mode .task-item {
  background-color: #2c2c3e;
}

#container.dark-mode .task-item:hover {
  background-color: #3a3a52;
}

#container.dark-mode .task-item span {
  color: #eee;
}

#container.dark-mode .error-msg {
  color: #ff6b6b;
}

/* Responsive - Mobile */
@media (max-width: 600px) {
  #task-input,
  #add-task-btn {
    width: 100%;
  }

  .complete-btn,
  .remove-btn {
    width: 48%;
    margin: 5px 1%;
  }

  .task-item span {
    font-size: 16px;
  }
}