* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    color: white;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.auth-container {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 400px;
    margin: 0 auto;
}

.auth-container h2 {
    margin-bottom: 10px;
    color: #333;
}

.auth-container p {
    color: #666;
    margin-bottom: 25px;
}

.auth-input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #eee;
    border-radius: 10px;
    font-size: 16px;
    margin-bottom: 15px;
    outline: none;
    transition: border-color 0.3s;
}

.auth-input:focus {
    border-color: #667eea;
}

.auth-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.auth-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.auth-divider {
    margin: 20px 0;
    color: #999;
    font-size: 14px;
}

.auth-link {
    color: #667eea;
    cursor: pointer;
    text-decoration: underline;
}

.message {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 14px;
    display: none;
}

.message.success {
    background: #d4edda;
    color: #155724;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
}

.app-container {
    display: none;
}

.user-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: white;
    font-size: 14px;
}

.user-email {
    opacity: 0.9;
}

.logout-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.3s;
}

.logout-btn:hover {
    background: rgba(255,255,255,0.3);
}

.input-section {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

#todoInput {
    flex: 1;
    min-width: 200px;
    padding: 15px 20px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    outline: none;
}

.input-select {
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    background: white;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    cursor: pointer;
    outline: none;
}

#addBtn {
    padding: 15px 25px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

#addBtn:hover {
    background: #45a049;
    transform: translateY(-2px);
}

#addBtn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.todo-list {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

.todo-item {
    padding: 12px 20px;
    border-bottom: 1px solid #f0f0f0;
    transition: background 0.2s, transform 0.2s;
    cursor: grab;
}

.todo-row-top {
    display: flex;
    align-items: center;
    gap: 10px;
}

.todo-row-bottom {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
    padding-left: 26px;
}

.todo-item:active {
    cursor: grabbing;
}

.todo-item.dragging {
    opacity: 0.4;
    background: #f0f0f0;
}

.touch-dragging {
    border-radius: 10px;
    background: white;
}

.todo-item.drag-over {
    border-top: 3px solid #667eea;
}

.todo-item:last-child {
    border-bottom: none;
}

.todo-item:hover {
    background: #f9f9f9;
}

.drag-handle {
    color: #ccc;
    cursor: grab;
    padding: 5px;
    font-size: 16px;
}

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

.priority-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: bold;
    min-width: 35px;
    text-align: center;
}

.priority-P0 {
    background: #ff4444;
    color: white;
}

.priority-P1 {
    background: #ff8800;
    color: white;
}

.priority-P2 {
    background: #ffcc00;
    color: #333;
}

.priority-P3 {
    background: #88cc00;
    color: white;
}

.todo-text {
    flex: 1;
    font-size: 15px;
    color: #333;
    word-break: break-word;
    min-width: 100px;
}

.status-select {
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 12px;
    background: white;
    cursor: pointer;
    outline: none;
}

.status-select:focus {
    border-color: #667eea;
}

.priority-select-small {
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 12px;
    background: white;
    cursor: pointer;
    outline: none;
}

.delete-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: #ff5252;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.todo-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    background: #ff1744;
    transform: scale(1.1);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.loading-state {
    text-align: center;
    padding: 40px 20px;
    color: #999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #f0f0f0;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.stats {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
    color: white;
    font-size: 13px;
    flex-wrap: wrap;
}

.stats span {
    background: rgba(255,255,255,0.2);
    padding: 8px 14px;
    border-radius: 20px;
}

.sync-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    padding: 10px 20px;
    border-radius: 25px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    font-size: 14px;
    display: none;
    align-items: center;
    gap: 8px;
}

.sync-indicator.show {
    display: flex;
}

.sync-dot {
    width: 8px;
    height: 8px;
    background: #4CAF50;
    border-radius: 50%;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* 状态颜色 */
.status-未开始 { color: #999; }
.status-进行中 { color: #2196F3; }
.status-已完成 { color: #4CAF50; }
.status-暂停 { color: #ff9800; }

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: #999;
}

/* 图片缩略图 */
.todo-image-thumb {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s;
    flex-shrink: 0;
}

.todo-image-thumb:hover {
    transform: scale(1.1);
}

/* 图片预览弹窗 */
.image-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.image-modal.show {
    display: flex;
}

.image-modal img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 8px;
}

.image-modal-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 40px;
    cursor: pointer;
    opacity: 0.8;
}

.image-modal-close:hover {
    opacity: 1;
}

/* 上传按钮 */
.upload-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: #667eea;
    color: white;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    flex-shrink: 0;
}

.upload-btn:hover {
    background: #5a6fd6;
    transform: translateY(-2px);
}

.upload-btn.has-image {
    background: #4CAF50;
}

/* 图片预览条 */
.image-preview-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 15px;
    padding: 8px 12px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.upload-preview-img {
    height: 50px;
    max-width: 200px;
    object-fit: cover;
    border-radius: 6px;
}

.remove-image-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: #ff5252;
    color: white;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.remove-image-btn:hover {
    background: #ff1744;
}

/* 来源文本提示 */
.source-text-indicator {
    font-size: 11px;
    color: #999;
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 4px;
    cursor: help;
}

@media (max-width: 600px) {
    body { padding: 10px; }
    h1 { font-size: 1.5rem; margin-bottom: 15px; }
    .input-section { flex-direction: column; gap: 8px; }
    .input-section .upload-btn { width: 100%; flex-direction: row; gap: 6px; }
    .input-section .upload-btn::after { content: '上传图片'; font-size: 14px; }
    #addBtn { width: 100%; }
    .auth-container { padding: 25px; }
    .user-bar { flex-direction: column; gap: 10px; text-align: center; }

    .todo-item { padding: 10px 12px; }

    .todo-row-top { gap: 8px; }
    .todo-row-bottom { padding-left: 0; margin-top: 8px; }

    .drag-handle { display: block; font-size: 16px; padding: 4px; touch-action: none; }
    .todo-text { font-size: 14px; }
    .todo-image-thumb { width: 32px; height: 32px; }
    .priority-badge { padding: 2px 6px; font-size: 11px; min-width: auto; }
    .status-select, .priority-select-small { padding: 4px 6px; font-size: 12px; }
    .delete-btn { opacity: 1; width: 28px; height: 28px; }
    .source-text-indicator { display: none; }

    .stats { flex-wrap: wrap; gap: 8px; }
    .stats span { font-size: 12px; padding: 5px 10px; }
}