:root {
    /* Color Palette - Light Mode - Stardew Valley */
    --primary-color: #d97a3a; /* Earthy wood orange */
    --primary-hover: #b95d22;
    --bg-color: #f4d9b4; /* Warm sand/wood */
    --card-bg: #e6c594; /* Darker board */
    --text-main: #4a3424; /* Dark brown for contrast */
    --text-muted: #735942;
    --border-color: #8c603a; /* Wood border */
    --input-bg: #f9eedf;
    --accent-red: #d94a3a;
    --accent-green: #629c44; /* Grass green */
    --shadow: 4px 4px 0px rgba(0,0,0,0.15); /* Hard pixel shadow */
    --glass-blur: none; /* No glass */

    /* Tag Colors - Light Mode */
    --tag-movie-bg: #ff9aa2;
    --tag-movie-text: #6b2d2d;
    --tag-book-bg: #b5ebb6;
    --tag-book-text: #2d5a3a;
    --tag-music-bg: #a2d2ff;
    --tag-music-text: #2d4a6b;
    --tag-course-bg: #f9f9a2;
    --tag-course-text: #5a5a2d;
    --tag-game-bg: #ffc8a2;
    --tag-game-text: #6b442d;
}

.dark-mode {
    /* Color Palette - Dark Mode - Stardew Night */
    --primary-color: #b56c36;
    --primary-hover: #985526;
    --bg-color: #2b394a; /* Night sky blue */
    --card-bg: #3c4c61;
    --text-main: #f0decc;
    --text-muted: #b5a496;
    --border-color: #1a2533;
    --input-bg: #222d3b;
    --shadow: 4px 4px 0px rgba(0,0,0,0.3);

    /* Tag Colors - Dark Mode */
    --tag-movie-bg: #8c4a4a;
    --tag-movie-text: #ffb3ba;
    --tag-book-bg: #4a8c5a;
    --tag-book-text: #baffc9;
    --tag-music-bg: #4a6a8c;
    --tag-music-text: #bae1ff;
    --tag-course-bg: #8c8c4a;
    --tag-course-text: #ffffba;
    --tag-game-bg: #8c5b3a;
    --tag-game-text: #ffd1a3;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'DotGothic16', 'Inter', sans-serif;
    image-rendering: auto; /* Base */
}
svg {
    image-rendering: pixelated;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
}

/* Background Animated Circles - Removed for Pixel Art Vibe */
.background-blur {
    display: none;
}


.app-container {
    width: 100%;
    max-width: 600px;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

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

.logo h1 {
    font-size: 28px;
    font-weight: normal;
    letter-spacing: -1px;
    color: var(--text-main);
}

.logo h1 span {
    color: var(--primary-color);
}

.icon-btn {
    background: var(--card-bg);
    border: 4px solid var(--border-color);
    color: var(--text-main);
    width: 44px;
    height: 44px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.1s ease;
    box-shadow: 2px 2px 0px rgba(0,0,0,0.2);
}

.icon-btn:hover {
    transform: translateY(2px);
    box-shadow: 0px 0px 0px rgba(0,0,0,0.2);
}

.icon-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
    box-shadow: inset 2px 2px 4px rgba(0,0,0,0.2);
}

body.eraser-mode {
    cursor: cell; /* 備用樣式 */
}

body.eraser-mode #animation-canvas {
    cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='32' height='32' viewBox='0 0 24 24' fill='none' stroke='%236366f1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='m7 21-4.3-4.3c-1-1-1-2.5 0-3.4l9.6-9.6c1-1 2.5-1 3.4 0l5.6 5.6c1 1 1 2.5 0 3.4L13 21'/><path d='M22 21H7'/><path d='m5 11 9 9'/></svg>") 0 24, crosshair;
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

.icon-btn {
    position: relative;
}

#user-name-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--primary-color);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border: 2px solid var(--border-color);
    white-space: nowrap;
    pointer-events: none;
}

.hidden { display: none; }

/* Cards & Components */
.card {
    background: var(--card-bg);
    border: 4px solid var(--border-color);
    border-radius: 0;
    padding: 24px;
    box-shadow: var(--shadow);
}

/* Add Task Section */
.add-task-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.input-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap; /* allow wrapping on small screens */
    width: 100%;
}

@media (max-width: 480px) {
    .input-group {
        flex-direction: column;
    }
    #task-input {
        width: 100% !important; /* ensure full width on mobile */
    }
}

#task-input {
    flex: 1;
    background: var(--input-bg);
    border: 4px solid var(--border-color);
    padding: 14px 18px;
    border-radius: 0;
    color: var(--text-main);
    font-size: 16px;
    transition: all 0.1s ease;
}


/* 統一 focus-visible 樣式 */
#task-input:focus-visible {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color);
}
/* 其他可聚焦元素的統一樣式 */
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color);
}


.primary-btn {
    background: var(--primary-color);
    color: white;
    border: 4px solid #8c4a24;
    padding: 0 24px;
    border-radius: 0;
    font-weight: normal;
    cursor: pointer;
    transition: all 0.1s ease;
    white-space: nowrap;
    box-shadow: 2px 2px 0px rgba(0,0,0,0.3);
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(2px);
    box-shadow: 0px 0px 0px rgba(0,0,0,0.3);
}

.options-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.option-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.option-item label {
    font-size: 13px;
    font-weight: normal;
    color: var(--text-muted);
    margin-left: 4px;
}

.option-item input, .option-item select {
    background: var(--input-bg);
    border: 4px solid var(--border-color);
    padding: 10px 12px;
    border-radius: 0;
    color: var(--text-main);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.1s ease;
}

.option-item select {
    appearance: none;
    -webkit-appearance: none;
    padding-right: 36px; /* 增加右側空間給圖示 */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center; /* 這裡控制圖示往左移動的距離 */
}

/* Filter Section */
.filter-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4px;
}

.filter-tabs {
    display: flex;
    background: var(--card-bg);
    padding: 5px;
    border-radius: 0;
    border: 4px solid var(--border-color);
    box-shadow: 2px 2px 0px rgba(0,0,0,0.1);
}

.filter-btn {
    background: transparent;
    border: none;
    padding: 8px 16px;
    border-radius: 0;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: normal;
    cursor: pointer;
    transition: all 0.1s ease;
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
}

.stats {
    font-size: 14px;
    font-weight: normal;
    color: var(--text-muted);
}

/* Todo List Area */
.todo-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.todo-item {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border: 4px solid var(--border-color);
    padding: 16px 20px;
    border-radius: 0;
    box-shadow: var(--shadow);
    transition: transform 0.1s;
}


.todo-item:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.checkbox-container {
    cursor: pointer;
    margin-right: 10px;
}

.todo-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.task-text {
    font-size: 16px;
    font-weight: normal;
    color: var(--text-main);
}

.todo-item.completed .task-text {
    color: var(--text-muted);
    text-decoration: line-through;
    opacity: 0.7;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

.tag-reason-text {
    font-size: 13px;
    color: var(--text-muted);
    font-style: italic;
    margin-top: -2px;
}

.tag-badge {
    padding: 4px 12px;
    border-radius: 0;
    font-weight: normal;
    font-size: 11px;
    display: inline-block;
    border: 2px solid rgba(0,0,0,0.2);
}

/* 標籤配色系統 */
.tag-badge.tag-影視 {
    background: var(--tag-movie-bg);
    color: var(--tag-movie-text);
}

.tag-badge.tag-書籍 {
    background: var(--tag-book-bg);
    color: var(--tag-book-text);
}

.tag-badge.tag-音樂 {
    background: var(--tag-music-bg);
    color: var(--tag-music-text);
}

.tag-badge.tag-課程 {
    background: var(--tag-course-bg);
    color: var(--tag-course-text);
}

.tag-badge.tag-遊戲 {
    background: var(--tag-game-bg);
    color: var(--tag-game-text);
}

.tag-select-wrapper {
    display: flex;
    gap: 12px;
}

.tag-select-wrapper select {
    flex: 1;
}

.actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 6px;
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.bomb-btn:hover, .bomb-btn.active {
    color: #ef4444;
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.bomb-btn.active svg {
    fill: #ef4444;
}

.todo-item.is-thunder {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.3);
}

.todo-item.is-thunder .checkbox-container {
    cursor: not-allowed;
    opacity: 0.6;
}

.pin-btn:hover, .pin-btn.active {
    color: #f59e0b;
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.pin-btn.active svg {
    fill: #f59e0b;
}

.todo-item.pinned {
    border-left: 4px solid #f59e0b;
}

.calendar-btn:hover {
    color: var(--accent-green);
    border-color: var(--accent-green);
    background: rgba(34, 197, 94, 0.1);
}

.delete-btn:hover {
    color: var(--accent-red);
    border-color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* Custom Checkbox */
.custom-checkbox {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.todo-item.completed .custom-checkbox {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.custom-checkbox::after {
    content: '✓';
    color: white;
    font-size: 14px;
    display: none;
}

.todo-item.completed .custom-checkbox::after {
    display: block;
}

/* Responsive */
@media (max-width: 480px) {
    .options-group {
        grid-template-columns: 1fr;
    }
    
    .filter-section {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
    }
    
    .stats {
        display: none;
    }
}


.todo-item.deleting {
    pointer-events: none;
}

/* Drag and Drop Styles */
.drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 6px;
    color: var(--text-muted);
    cursor: grab;
    padding: 2px;
    border-radius: 4px;
    transition: background 0.2s ease;
}

.drag-handle:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.drag-handle:active {
    cursor: grabbing;
}

.todo-item.dragging {
    opacity: 0.5;
    transform: scale(0.98);
    border: 2px dashed var(--primary-color);
    box-shadow: none;
    background: rgba(99, 102, 241, 0.05);
}

/* 讓正在拖動的項目不響應滑鼠，以便 dragover 能偵測到下方的項目 */
.todo-item.dragging * {
    pointer-events: none;
}

.todo-list.drag-over .todo-item {
    transition: transform 0.2s ease;
}

/* 拖拽指示線 (HR) */
.drag-placeholder {
    height: 3px;
    background: var(--primary-color);
    margin: 4px 0;
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
    pointer-events: none;
    transition: all 0.1s ease;
}

#animation-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Footer Styles */
.app-footer {
    margin-top: 40px;
    padding: 20px 0;
    text-align: center;
    border-top: 2px dashed var(--border-color);
}

.app-footer p {
    font-size: 14px;
    color: var(--text-muted);
    opacity: 0.8;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all 0.3s ease;
}

.modal-overlay.hidden {
    display: none;
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    animation: modalPop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalPop {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 4px solid var(--border-color);
}

.modal-header h2 {
    font-size: 20px;
    font-weight: normal;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.task-info {
    font-size: 14px;
    color: var(--text-muted);
    background: var(--input-bg);
    padding: 10px;
    border: 2px dashed var(--border-color);
}

#task-note {
    width: 100%;
    background: var(--input-bg);
    border: 4px solid var(--border-color);
    padding: 14px;
    color: var(--text-main);
    font-size: 15px;
    resize: none;
    transition: all 0.1s ease;
}

#task-note:focus {
    outline: none;
    border-color: var(--primary-color);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
}

.modal-footer .primary-btn {
    width: 100%;
    padding: 12px;
}

/* 點擊清單內容時的游標提示 */
.todo-content {
    cursor: pointer;
}

.todo-content:hover .task-text {
    color: var(--primary-color);
}