/* --- 基本樣式與深色模式 --- */
:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --title-text-color: #FFCC00;
    --primary-text-color: #e0e0e0;
    --secondary-text-color: #a0a0a0;
    /* --accent-color: #bc88fc; */
    --accent-color: #FFCC00;
    --card-border-color: #333;    
    --navbar-height: 5rem; /* 導覽列的固定高度 */
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--primary-text-color);
    line-height: 1.6;
}

/* --- 導覽列 (共用) --- */
.navbar {
    background-color: var(--surface-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--card-border-color);
    position: sticky; /* 固定在頂部 */
    top: 0;
    z-index: 50; /* 確保在主內容之上 */    
    min-height: var(--navbar-height); /* 設定最小高度 */
    box-sizing: border-box; /* 確保 padding 和 border 包含在高度計算內 */
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 1rem; /* 在圖示和標題之間增加一些間距 */
}

.navbar-brand {
    font-size: 1rem;
    font-weight: bold;
    color: var(--accent-color);
    text-decoration: none;
}

.navbar-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
}

/* --- 首頁 (index.html) 專用樣式 --- */
#datetime-display {
    color: var(--primary-text-color);
    font-size: 1rem;
    font-family: 'Courier New', Courier, monospace; /* 使用等寬字體避免跳動 */
}

.hero {
    text-align: center;
    padding: 6rem 2rem;
}

.hero h1 {
    font-size: 3rem;
    color: var(--title-text-color);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--secondary-text-color);
}

.tools-section {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background-color: var(--surface-color);
    border: 1px solid var(--card-border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-sizing: border-box;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.tool-card p {
    flex: 1;
    margin-bottom: 1.5rem;
}

.tool-card h3 {
    margin-top: 0;
    color: var(--accent-color);
}

.card-link {
    display: inline-block;
    margin-top: auto;
    padding: 0.5rem 1rem;
    background-color: var(--accent-color);
    color: var(--bg-color);
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    align-self: center;
}

/* --- 日期計算器 (date-calculator.html) 專用樣式 --- */
.container {
    padding: 2rem;
    max-width: 800px;
    margin: 2rem auto;
    background-color: var(--surface-color);
    border-radius: 8px;
}

.container h1, .container h2, .container h3 {
    color: var(--accent-color);
    border-bottom: 1px solid var(--card-border-color);
    padding-bottom: 0.5rem;
}

.today-info-section {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 2rem;
    text-align: center;
    font-size: 1.1rem;
}

.calculator-section {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--secondary-text-color);
}

/* 通用表單輸入框樣式 */
.form-input {
    width: 100%;
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--card-border-color);
    color: var(--primary-text-color);
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s; /* 為所有按鈕增加過渡效果 */
}

#result, #lunar-date {
    margin-top: 1rem;
    font-size: 1.2rem;
    font-weight: bold;
}

/* --- 折疊功能樣式 --- */
.collapsible-header {
    cursor: pointer; /* 讓標題看起來可點擊 */
    user-select: none; /* 防止點擊時選取文字 */
}

.collapsible-header:hover {
    color: var(--primary-text-color); /* 滑鼠移上去時稍微變亮 */
}

.collapsible-content {
    max-height: 1000px; /* 預設展開時足夠大的高度 */
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

/* --- 單位換算器 (unitconv.html) 專用樣式 --- */
.unit-converter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.converter-controls {
    margin-bottom: 1rem;
    text-align: right;
}

.reset-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    color: var(--secondary-text-color);
    border: 1px solid var(--secondary-text-color);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

.reset-btn:hover {
    background-color: var(--secondary-text-color);
    color: var(--surface-color);
}

.unit-input-group {
    display: flex;
    align-items: center; /* 垂直置中 */
    gap: 1rem; /* 增加標籤和輸入框之間的間距 */
}

.unit-input-group label {
    color: var(--secondary-text-color);
    flex-basis: 50%; /* 標籤佔據約一半寬度 */
    margin-bottom: 0; /* 覆寫預設的 margin */
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* --- 密碼產生器 (passwordgen.html) 專用樣式 --- */
.password-display-container {
    display: flex;
    margin-bottom: 1.5rem;
}

#passwordDisplay {
    flex-grow: 1;
    padding: 0.75rem;
    font-size: 1.2rem;
    font-family: 'Courier New', Courier, monospace; /* 等寬字體更適合顯示密碼 */
    border-radius: 4px 0 0 4px; /* 左側圓角 */
    border-right: none; /* 移除右邊框，與按鈕無縫連接 */
}

#passwordDisplay::placeholder {
    color: var(--secondary-text-color);
    font-size: 1rem;
    font-family: sans-serif;
}

#copyBtn {
    padding: 0.75rem 1.5rem;
    border-radius: 0 4px 4px 0; /* 右側圓角 */
    border: 1px solid var(--accent-color); /* 與主按鈕風格一致 */
}

.form-group-checkbox {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

/* --- 匯率換算器頁尾資訊 --- */
.info-footer {
    margin-top: 2rem;
}

/* --- 匯率換算器 (currency.html) 專用樣式 --- */
.currency-converter-controls {
    display: flex;
    align-items: flex-end; /* 讓元素底部對齊 */
    gap: 1rem;
}

.currency-group {
    flex: 1; /* 讓兩側的貨幣區塊等寬 */
}

.swap-rate-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 1rem; /* 為了與 form-group 的 margin-bottom 對齊 */
}

#swapBtn {
    font-size: 1.5rem;
    padding: 0.25rem 0.75rem;
    line-height: 1;
}

#rateDisplay {
    font-size: 0.9rem;
    color: var(--secondary-text-color);
    white-space: nowrap; /* 避免換行 */
}

.last-updated-info {
    text-align: center;
    font-size: 0.8rem;
    color: var(--secondary-text-color);
    margin-top: 1.5rem;
}

.disclaimer-info {
    text-align: center;
    font-size: 0.9rem;
    color: var(--secondary-text-color);
    margin-top: 0.5rem;
}

.disclaimer-info a {
    color: var(--accent-color);
    text-decoration: underline;
}

/* 匯率表格中的國旗圖示 */
.unit-input-group .currency-flag {
    width: 30px;
    height: auto; /* 保持原始比例 */
    vertical-align: middle; /* 確保與旁邊的文字垂直對齊 */
    margin-right: 8px; /* 與文字間的距離 */
    border-radius: 2px;
}



/* --- 響應式設計 --- */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }
    
    .nav-links {
        margin-top: 1rem;
    }

    .container {
        padding: 1rem;
        margin: 1rem auto;
        border-radius: 6px;
    }

    .currency-converter-controls {
        flex-direction: column;
        align-items: stretch; /* 在小螢幕上垂直排列並拉伸 */
    }

    .swap-rate-container {
        flex-direction: row-reverse; /* 交換按鈕和匯率顯示的位置 */
    }
}

@media (max-width: 600px) {
    /* 表格響應式優化：改為可水平滑動的區塊，防止文字擠壓換行 */
    .batch-table, .dns-results-table {
        display: block;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .batch-table th, .batch-table td,
    .dns-results-table th, .dns-results-table td {
        white-space: nowrap; /* 確保內容在一行內完整顯示 */
        padding: 0.5rem 0.75rem; /* 稍微縮小內距 */
        font-size: 0.85rem; /* 稍微縮小字型 */
    }

    /* 連線測試控制區與 DNS 表單改為滿寬垂直排列，便於手機觸控點擊 */
    .test-controls, .dns-form {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .test-controls .form-input, .test-controls button,
    .dns-form .form-input, .dns-form select, .dns-form button {
        width: 100%;
        flex: none;
    }

    .checkbox-label {
        justify-content: center; /* 行動端將持續測試選項置中 */
    }
}

/* --- 側邊欄 (Sidebar) --- */
.sidebar {
    height: calc(100% - var(--navbar-height)); /* 計算剩餘高度 */
    width: 0; /* 初始隱藏 */
    position: fixed;
    z-index: 100;
    top: var(--navbar-height); /* 從導覽列下方開始 */
    left: 0;
    background-color: rgba(30, 30, 30, 0.85); /* 帶有透明度的背景 */
    backdrop-filter: blur(5px); /* 毛玻璃/模糊效果 */
    -webkit-backdrop-filter: blur(5px); /* 針對 Safari 的相容性 */
    overflow-x: hidden;
    padding-top: 20px; /* 調整頂部間距 */
}

.sidebar a {
    padding: 10px 15px 10px 32px;
    text-decoration: none;
    font-size: 1.25rem; /* 調整字體大小 */
    color: var(--secondary-text-color); /* 使用變數 */
    display: block;
    transition: 0.3s;
}

.sidebar a:hover {
    color: var(--accent-color); /* 滑鼠懸停時使用強調色 */
}

.sidebar .closebtn {
    position: absolute;
    top: 0; /* 調整位置 */
    right: 25px;
    font-size: 36px;
    color: var(--secondary-text-color); /* 統一顏色 */
}

.openbtn {
    font-size: 24px;
    cursor: pointer;
    color: var(--primary-text-color); /* 使用變數 */
}

/* --- 網路連線與 DNS 測試工具 (nettest.html) 專用樣式 --- */

/* 頁籤系統 */
.tabs-container {
    display: flex;
    border-bottom: 1px solid var(--card-border-color);
    margin-bottom: 2rem;
    overflow-x: auto;
    scrollbar-width: none; /* Firefox */
}

.tabs-container::-webkit-scrollbar {
    display: none; /* Safari and Chrome */
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: transparent;
    color: var(--secondary-text-color);
    border: none;
    border-bottom: 2px solid transparent;
    font-weight: 500;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    white-space: nowrap;
    border-radius: 0;
}

.tab-btn:hover {
    color: var(--primary-text-color);
    background-color: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom: 2px solid var(--accent-color);
    background-color: rgba(255, 255, 255, 0.05);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 連線狀態指示燈 */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.online {
    background-color: #2ec4b6;
    box-shadow: 0 0 8px #2ec4b6;
}

.status-dot.offline {
    background-color: #e71d36;
    box-shadow: 0 0 8px #e71d36;
}

.status-dot.testing {
    background-color: #ff9f1c;
    box-shadow: 0 0 8px #ff9f1c;
    animation: status-pulse 1s infinite alternate;
}

@keyframes status-pulse {
    from { transform: scale(0.9); opacity: 0.6; }
    to { transform: scale(1.1); opacity: 1; }
}

/* 連線測試控制區 */
.test-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: center;
    flex-wrap: wrap;
}

.test-controls .form-input {
    flex: 1;
    min-width: 250px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
    color: var(--primary-text-color);
}

.checkbox-label input {
    cursor: pointer;
}

/* 數據總覽儀表板 */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border-color);
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
}

.metric-card .metric-label {
    font-size: 0.9rem;
    color: var(--secondary-text-color);
    margin-bottom: 0.5rem;
}

.metric-card .metric-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-text-color);
    font-family: 'Courier New', Courier, monospace;
}

/* 即時 SVG 折線圖 */
.chart-container {
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--card-border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 2rem;
    position: relative;
}

.chart-title {
    font-size: 1rem;
    color: var(--secondary-text-color);
    margin-bottom: 1rem;
}

.chart-svg {
    width: 100%;
    height: 200px;
    display: block;
}

.chart-grid-line {
    stroke: rgba(255, 255, 255, 0.05);
    stroke-width: 1;
}

.chart-axis-label {
    fill: var(--secondary-text-color);
    font-size: 10px;
    font-family: sans-serif;
}

.chart-line {
    fill: none;
    stroke: var(--accent-color);
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.chart-area {
    fill: rgba(255, 204, 0, 0.1);
}

.chart-dot {
    fill: var(--bg-color);
    stroke: var(--accent-color);
    stroke-width: 2;
    cursor: pointer;
    transition: r 0.2s;
}

.chart-dot:hover {
    r: 6;
}

/* 常用網站批次檢測 */
.batch-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.batch-table th, .batch-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--card-border-color);
}

.batch-table th {
    color: var(--secondary-text-color);
    font-weight: 500;
}

.batch-table tr:hover {
    background-color: rgba(255, 255, 255, 0.01);
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    white-space: nowrap; /* 確保狀態徽章在手機上不折行 */
}

.badge.success {
    background-color: rgba(46, 196, 182, 0.15);
    color: #2ec4b6;
    border: 1px solid rgba(46, 196, 182, 0.3);
}

.badge.danger {
    background-color: rgba(231, 29, 54, 0.15);
    color: #e71d36;
    border: 1px solid rgba(231, 29, 54, 0.3);
}

.badge.warning {
    background-color: rgba(255, 159, 28, 0.15);
    color: #ff9f1c;
    border: 1px solid rgba(255, 159, 28, 0.3);
}

/* DNS 查詢區 */
.dns-form {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.dns-form .form-input {
    flex: 2;
    min-width: 200px;
}

.dns-form select {
    flex: 1;
    min-width: 120px;
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--card-border-color);
    color: var(--primary-text-color);
    border-radius: 4px;
    box-sizing: border-box;
    cursor: pointer;
}

.dns-results-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.dns-results-table th, .dns-results-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--card-border-color);
}

.dns-results-table th {
    color: var(--secondary-text-color);
    font-weight: 500;
}

/* 本機網路資訊 */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.info-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--card-border-color);
    border-radius: 6px;
    padding: 1.5rem;
}

.info-card h3 {
    margin-top: 0;
    color: var(--accent-color);
    border-bottom: 1px solid var(--card-border-color);
    padding-bottom: 0.5rem;
    font-size: 1.1rem;
}

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

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

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

.info-label {
    color: var(--secondary-text-color);
}

.info-value {
    font-weight: 500;
    text-align: right;
    word-break: break-all;
}

.maps-link {
    color: var(--accent-color);
    text-decoration: underline;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* --- 世界時間 (worldtime.html) 專用樣式 --- */
.worldtime-header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--card-border-color);
}

.worldtime-header-section h2 {
    margin: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.timezone-add-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.timezone-add-controls select {
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--card-border-color);
    color: var(--primary-text-color);
    border-radius: 4px;
    cursor: pointer;
    min-width: 180px;
}

.timezone-add-controls button {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* 時間控制看板 */
.time-dashboard-banner {
    background: linear-gradient(135deg, rgba(255, 204, 0, 0.1) 0%, rgba(255, 204, 0, 0.02) 100%);
    border: 1px solid rgba(255, 204, 0, 0.3);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.dashboard-main-info {
    flex: 1;
    text-align: center;
    border-right: 1px solid rgba(255, 204, 0, 0.2);
    padding-right: 2rem;
}

.dashboard-controls {
    flex: 1.5;
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.time-dashboard-banner .label {
    font-size: 0.9rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.time-dashboard-banner .time {
    font-size: 2.5rem;
    font-weight: bold;
    font-family: 'Courier New', Courier, monospace;
    color: #ffffff;
    margin-bottom: 0.25rem;
}

.time-dashboard-banner .date {
    font-size: 1.1rem;
    color: var(--secondary-text-color);
}

/* 時區時鐘網格與卡片 */
.worldtime-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
}

.clock-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--card-border-color);
    border-radius: 6px;
    padding: 1rem;
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.clock-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 204, 0, 0.4);
}

.clock-card.local-highlight {
    border-color: var(--accent-color);
    background: linear-gradient(to bottom, rgba(255, 204, 0, 0.03), rgba(255, 204, 0, 0));
}

.clock-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.clock-card .city-info {
    display: flex;
    flex-direction: column;
    max-width: 85%;
}

.clock-card .city-name {
    font-size: 1.05rem;
    font-weight: bold;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.timezone-flag {
    width: 20px;
    height: 14px;
    object-fit: cover;
    border-radius: 2px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.clock-card .region-name {
    font-size: 0.75rem;
    color: var(--secondary-text-color);
    margin-top: 0.15rem;
}

.clock-card .remove-btn {
    background: none;
    border: none;
    color: var(--secondary-text-color);
    font-size: 1.2rem;
    padding: 0;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
    font-weight: normal;
}

.clock-card .remove-btn:hover {
    color: #ff4d4d;
    background: none;
}

.clock-card .time-display {
    font-size: 1.65rem;
    font-weight: bold;
    font-family: 'Courier New', Courier, monospace;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.clock-card .date-display {
    font-size: 0.85rem;
    color: var(--primary-text-color);
    margin-bottom: 0.15rem;
}

.clock-card .relative-info {
    font-size: 0.8rem;
    color: var(--secondary-text-color);
}

.clock-card .relative-info span {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    background-color: rgba(255, 255, 255, 0.05);
    margin-right: 0.25rem;
}

.clock-card .relative-info .time-diff.fast {
    color: #2ec4b6;
    background-color: rgba(46, 196, 182, 0.1);
}

.clock-card .relative-info .time-diff.slow {
    color: #e71d36;
    background-color: rgba(231, 29, 54, 0.1);
}

/* 跨時區對照區背景 */
.dashboard-controls .slider-controls-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.slider-controls-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1.5rem;
}

.slider-controls-group .control-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.slider-controls-group label {
    font-size: 0.85rem;
    margin-bottom: 0;
}

.slider-controls-group select, .slider-controls-group input[type="date"] {
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--card-border-color);
    color: var(--primary-text-color);
    border-radius: 4px;
}

.slider-container {
    padding: 1rem 0;
}

.slider-time-label-container {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--secondary-text-color);
    margin-top: 0.5rem;
    font-family: 'Courier New', Courier, monospace;
}

.range-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--card-border-color);
    outline: none;
    margin: 1rem 0;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    transition: transform 0.1s;
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    transition: transform 0.1s;
}

.range-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.current-slider-val {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--accent-color);
    text-align: center;
    margin-top: 0.5rem;
    font-family: 'Courier New', Courier, monospace;
}

/* 窄螢幕雙欄自適應與響應式優化 */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
        margin: 1rem auto;
    }

    .time-dashboard-banner {
        flex-direction: column;
        align-items: stretch;
        gap: 1.5rem;
        padding: 1.25rem;
    }

    .dashboard-main-info {
        border-right: none;
        border-bottom: 1px solid rgba(255, 204, 0, 0.2);
        padding-right: 0;
        padding-bottom: 1.25rem;
    }

    .worldtime-header-section {
        margin-bottom: 1.5rem;
    }

    .timezone-add-controls {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        gap: 0.5rem;
    }

    .timezone-add-controls select,
    .timezone-add-controls button {
        width: 100% !important;
        margin: 0 !important;
    }

    .controls-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .controls-header button {
        width: 100%;
    }

    .dashboard-controls .slider-controls-group {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .dashboard-controls .slider-controls-group .control-item {
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
    }

    .dashboard-controls .slider-controls-group select,
    .dashboard-controls .slider-controls-group input[type="date"] {
        width: 100% !important;
        max-width: none !important;
        box-sizing: border-box;
    }

    .slider-time-label-container {
        font-size: 0.65rem;
    }

    .slider-time-label-container span {
        white-space: nowrap;
    }

    .worldtime-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .clock-card {
        padding: 0.75rem;
    }
    
    .clock-card .city-name {
        font-size: 0.95rem;
        gap: 0.25rem;
    }
    
    .timezone-flag {
        width: 16px;
        height: 11px;
    }
    
    .clock-card .region-name {
        font-size: 0.7rem;
    }
    
    .clock-card .time-display {
        font-size: 1.35rem;
    }
    
    .clock-card .date-display {
        font-size: 0.75rem;
    }
    
    .clock-card .relative-info {
        font-size: 0.7rem;
        display: flex;
        flex-direction: column;
        gap: 0.2rem;
    }
    
    .clock-card .relative-info span {
        margin-right: 0;
        display: inline-block;
        text-align: center;
    }
}