:root {
     /* 淺色主題變數 */
     --bg-color: #f3f6fc;
     --glass-bg: rgba(255, 255, 255, 0.7);
     --glass-border: rgba(255, 255, 255, 0.5);
     --text-primary: #2d3748;
     --text-secondary: #718096;
     --primary-color: #4a90e2;
     --primary-hover: #357abd;
     --card-bg: #ffffff;
     --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
     --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.05);
     --success: #38a169;
     --danger: #e53e3e;
     --input-bg: #ffffff;
     --input-border: #e2e8f0;
}

[data-theme="dark"] {
     --bg-color: #1a202c;
     --glass-bg: rgba(45, 55, 72, 0.7);
     --glass-border: rgba(255, 255, 255, 0.08);
     --text-primary: #f7fafc;
     --text-secondary: #a0aec0;
     --primary-color: #63b3ed;
     --primary-hover: #4299e1;
     --card-bg: #2d3748;
     --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.3);
     --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.4);
     --input-bg: #1a202c;
     --input-border: #4a5568;
}

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

body {
     font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
     background-color: var(--bg-color);
     color: var(--text-primary);
     transition: background-color 0.3s, color 0.3s;
     line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
     position: sticky; top: 0; z-index: 100;
     background: var(--glass-bg);
     backdrop-filter: blur(12px);
     -webkit-backdrop-filter: blur(12px);
     border-bottom: 1px solid var(--glass-border);
     padding: 15px 0;
     box-shadow: var(--shadow-sm);
}

.header-content { display: flex; justify-content: space-between; align-items: center; }
.logo-area { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 28px; }
.site-title { font-size: 1.5rem; font-weight: 700; letter-spacing: 0.5px; }

.header-controls { display: flex; gap: 15px; align-items: center; }

/* Buttons */
.action-btn {
     padding: 10px 20px; border-radius: 8px; font-weight: 600; cursor: pointer;
     transition: all 0.2s ease; border: none; font-size: 0.95rem;
     display: flex; align-items: center; justify-content: center; gap: 8px;
}
.primary-btn { background: var(--primary-color); color: white; box-shadow: 0 4px 10px rgba(74, 144, 226, 0.3); }
.primary-btn:hover { background: var(--primary-hover); transform: translateY(-2px); }
.secondary-btn { background: var(--card-bg); color: var(--text-primary); border: 1px solid var(--input-border); }
.secondary-btn:hover { border-color: var(--primary-color); transform: translateY(-2px); }
.icon-btn { background: none; border: none; font-size: 1.2rem; cursor: pointer; color: var(--text-primary); }

/* Glass Panel (Forms & Modals) */
.glass-panel {
     background: var(--glass-bg); backdrop-filter: blur(16px);
     border: 1px solid var(--glass-border);
     border-radius: 16px; padding: 25px; box-shadow: var(--shadow-md);
     margin-top: 30px; margin-bottom: 30px;
}

/* Form Controls */
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 20px; }
.input-group { display: flex; flex-direction: column; gap: 8px; }
.input-group label { font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); }

.modern-select, .modern-input {
     width: 100%; padding: 12px 16px; border-radius: 10px;
     border: 1px solid var(--input-border); background: var(--input-bg);
     color: var(--text-primary); font-size: 1rem; transition: border-color 0.2s, box-shadow 0.2s;
     outline: none; appearance: none;
}
.modern-select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='gray'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; background-size: 16px; }
.modern-input:focus, .modern-select:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2); }

.search-input-group { grid-column: span 2; }
@media (max-width: 768px) { .search-input-group { grid-column: span 1; } }

.search-bar-wrapper { position: relative; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); opacity: 0.5; }
.search-bar-wrapper .modern-input { padding-left: 45px; }

.form-actions { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--input-border); padding-top: 20px; }

/* Custom Checkbox */
.modern-checkbox { display: flex; align-items: center; gap: 10px; cursor: pointer; font-weight: 500; }
.modern-checkbox input { display: none; }
.checkmark { width: 22px; height: 22px; border: 2px solid var(--input-border); border-radius: 6px; display: inline-flex; justify-content: center; align-items: center; transition: 0.2s; }
.modern-checkbox input:checked ~ .checkmark { background: var(--primary-color); border-color: var(--primary-color); }
.modern-checkbox input:checked ~ .checkmark::after { content: '✓'; color: white; font-weight: bold; }

/* Results Grid */
.results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }

/* Item Card - Modernized */
.item-card {
     background: var(--card-bg); border-radius: 12px; padding: 20px;
     box-shadow: var(--shadow-sm); border: 1px solid var(--glass-border);
     transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s;
     display: flex; flex-direction: column; align-items: center; text-align: center;
     cursor: pointer; position: relative; overflow: hidden;
}
.item-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: var(--primary-color); }

.result-type-tag {
     position: absolute; top: 10px; left: 10px; font-size: 0.75rem; font-weight: bold;
     padding: 4px 10px; border-radius: 20px; background: rgba(74, 144, 226, 0.1); color: var(--primary-color);
}
.item-icon-container { width: 80px; height: 80px; display: flex; justify-content: center; align-items: center; margin: 15px 0; }
.item-icon { max-width: 100%; max-height: 100%; object-fit: contain; filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1)); }
.item-id { font-family: monospace; color: var(--text-secondary); font-size: 0.85rem; background: var(--bg-color); padding: 4px 8px; border-radius: 6px; transition: 0.2s; }
.item-id:hover { background: var(--primary-color); color: white; }
.item-name { font-size: 1.05rem; font-weight: 600; margin-top: 10px; color: var(--text-primary); }

/* Modals */
.modal-overlay {
     position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5);
     backdrop-filter: blur(5px); z-index: 1000; display: flex; justify-content: center; align-items: center;
}
.modal-content { width: 90%; max-width: 500px; margin: 0; max-height: 90vh; overflow-y: auto; }
.large-modal { max-width: 900px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.modal-close-button { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-secondary); }

/* Diff Tool Styles */
.diff-controls { display: flex; align-items: flex-end; gap: 20px; margin-bottom: 30px; background: var(--bg-color); padding: 20px; border-radius: 12px; }
.diff-select-group { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.diff-arrow { font-size: 1.5rem; padding-bottom: 10px; color: var(--text-secondary); }
.diff-results-area { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.diff-column { background: var(--bg-color); padding: 20px; border-radius: 12px; }
.success-text { color: var(--success); margin-bottom: 15px; border-bottom: 2px solid var(--success); padding-bottom: 10px; }
.danger-text { color: var(--danger); margin-bottom: 15px; border-bottom: 2px solid var(--danger); padding-bottom: 10px; }
.diff-list { max-height: 400px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
.diff-item { display: flex; align-items: center; gap: 10px; padding: 10px; background: var(--card-bg); border-radius: 8px; box-shadow: var(--shadow-sm); }
.diff-item img { width: 32px; height: 32px; object-fit: contain; }
.diff-item-info { display: flex; flex-direction: column; }
.diff-item-id { font-family: monospace; font-size: 0.8rem; color: var(--text-secondary); }

/* Loading Animation */
.loading-state { display: flex; flex-direction: column; align-items: center; padding: 40px; gap: 15px; color: var(--text-secondary); }
.pulse-ring { width: 40px; height: 40px; border: 4px solid var(--input-border); border-top-color: var(--primary-color); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Tooltip */
#item-card-tooltip { position: fixed; background: rgba(0,0,0,0.85); color: white; padding: 12px 16px; border-radius: 8px; font-size: 0.9rem; max-width: 300px; z-index: 1000; pointer-events: none; opacity: 0; transition: opacity 0.2s; box-shadow: var(--shadow-md); backdrop-filter: blur(4px); }
#item-card-tooltip.visible { opacity: 1; }

.modern-textarea { width: 100%; height: 200px; padding: 15px; margin-bottom: 20px; border-radius: 10px; border: 1px solid var(--input-border); background: var(--input-bg); color: var(--text-primary); font-family: monospace; resize: vertical; }
.full-width { width: 100%; }

/* --- 新增/優化的 CSS --- */
.diff-item-header {
     display: flex;
     align-items: center;
     gap: 8px;
     margin-bottom: 2px;
}

.diff-type-tag {
     font-size: 0.7rem;
     padding: 2px 6px;
     border-radius: 4px;
     background: rgba(74, 144, 226, 0.15);
     color: var(--primary-color);
     font-weight: bold;
     white-space: nowrap;
}

.modern-textarea {
     width: 100%;
     height: 300px;
     padding: 15px;
     margin-bottom: 15px;
     border-radius: 10px;
     border: 1px solid var(--input-border);
     background: var(--bg-color);
     color: var(--text-primary);
     font-family: monospace;
     font-size: 0.9rem;
     resize: vertical;
     outline: none;
}
.modern-textarea:focus {
     border-color: var(--primary-color);
}

/* --- 版本比對 Tabs 樣式 --- */
.diff-tabs-container { margin-top: 20px; }
.diff-tab-headers {
     display: flex; flex-wrap: wrap; gap: 8px;
     border-bottom: 2px solid var(--input-border);
     padding-bottom: 15px; margin-bottom: 20px;
}
.diff-tab-btn {
     background: var(--input-bg); /* 👈 把 transparent 改成實體背景色 */
     border: 1px solid var(--input-border);
     color: var(--text-primary);  /* 👈 讓文字顏色更深更清晰 */
     padding: 8px 16px;
     border-radius: 8px;
     cursor: pointer;
     transition: all 0.2s ease;
     font-weight: 600;
     box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05); /* 👈 增加一點微陰影讓按鈕浮出 */
}

.diff-tab-btn:hover {
     border-color: var(--primary-color);
     color: var(--primary-color);
     transform: translateY(-1px); /* 滑鼠移過去微微上浮 */
}

.diff-tab-btn.active {
     background: var(--primary-color);
     color: white;
     border-color: var(--primary-color);
     box-shadow: 0 4px 10px rgba(74, 144, 226, 0.3); /* 👈 激活狀態加上一點光暈效果 */
}

.diff-tab-content { display: none; }
.diff-tab-content.active { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
@media (max-width: 768px) {
     .diff-tab-content.active { grid-template-columns: 1fr; }
}

.diff-empty-message { text-align: center; color: var(--text-secondary); padding: 20px; font-style: italic; }

/* =========================================
   UI 緊湊化 (Compact Mode) 與 底部美化
   ========================================= */

/* --- 1. 美化「沒有更多資料了」 --- */
#no-more-results-message {
     /* 使用 Flexbox 讓文字兩側產生分隔線 */
     display: flex !important; /* 加上 !important 防止被 JS 的 block 覆蓋 */
     align-items: center;
     text-align: center;
     color: var(--text-secondary);
     font-size: 0.9rem;
     margin: 40px 0;
     opacity: 0.6;
}
/* 左側的橫線 */
#no-more-results-message::before,
     /* 右側的橫線 */
#no-more-results-message::after {
     content: '';
     flex: 1;
     border-bottom: 1px dashed var(--input-border);
     margin: 0 20px;
}
#no-more-results-message p { margin: 0; font-weight: 600; letter-spacing: 2px; }

/* 隱藏時仍然保持 display: none */
#no-more-results-message[style*="display: none"] {
     display: none !important;
}


/* --- 2. 整體 UI 縮小 (更緊湊的版面) --- */

/* 縮小 Header 導覽列 */
.site-header { padding: 10px 0; }
.site-title { font-size: 1.25rem; }
.logo-icon { font-size: 22px; }

/* 縮小搜尋面板與輸入框 */
.glass-panel { padding: 15px 20px; }
.form-row { gap: 15px; margin-bottom: 15px; }
.modern-select, .modern-input {
     padding: 8px 12px; /* 減少內邊距 */
     font-size: 0.9rem; /* 縮小字體 */
     border-radius: 8px;
}
.modern-select { background-position: right 8px center; background-size: 14px; }
.action-btn { padding: 8px 16px; font-size: 0.9rem; border-radius: 6px; }

/* 增加網格密度 (讓一排能塞下更多卡片) */
.results-grid {
     /* 最小寬度從 220px 縮小為 160px，讓一行能排更多個 */
     grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
     gap: 15px;
}

/* 縮小卡片內容 */
.item-card { padding: 12px; border-radius: 10px; }
.item-icon-container { width: 56px; height: 56px; margin: 10px 0; } /* 縮小圖標 */
.item-name { font-size: 0.9rem; margin-top: 8px; line-height: 1.3; } /* 縮小名稱 */
.item-id { font-size: 0.75rem; padding: 2px 6px; } /* 縮小 ID 標籤 */
.result-type-tag { font-size: 0.65rem; padding: 3px 8px; top: 8px; left: 8px; }

/* 縮小加載動畫 */
.loading-state { padding: 20px; gap: 10px; font-size: 0.9rem; }
.pulse-ring { width: 30px; height: 30px; border-width: 3px; }

.diff-item-id { cursor: pointer; transition: 0.2s; }
.diff-item-id:hover { color: var(--primary-color); }

/* --- 詳情視窗 Modal 樣式 --- */
.detail-header-info {
     display: flex;
     align-items: center;
     gap: 20px;
     margin-bottom: 20px;
     padding-bottom: 20px;
     border-bottom: 1px dashed var(--input-border);
}
.detail-modal-icon {
     width: 80px;
     height: 80px;
     object-fit: contain;
     background: var(--bg-color);
     border-radius: 12px;
     padding: 10px;
     border: 1px solid var(--input-border);
}
.detail-modal-title-group {
     display: flex;
     flex-direction: column;
     align-items: flex-start;
}
.detail-modal-title-group h4 {
     font-size: 1.25rem;
     color: var(--text-primary);
     margin: 0;
}
.detail-modal-desc-box {
     background: var(--bg-color);
     padding: 15px;
     border-radius: 8px;
     border: 1px solid var(--input-border);
     margin-bottom: 15px;
     color: var(--text-primary);
     line-height: 1.6;
     font-size: 0.95rem;
}
.detail-modal-subinfo-box {
     color: var(--text-secondary);
     font-size: 0.9rem;
     line-height: 1.5;
     background: rgba(0, 0, 0, 0.02);
     padding: 10px 15px;
     border-radius: 8px;
}
.detail-modal-subinfo-box ul {
     padding-left: 20px;
     margin: 5px 0 0 0;
}