/* ==========================================================================
1. 全局样式和变量 (Global Styles & Variables)
========================================================================== */
:root {
    /* 基础颜色 */
    --bg-color: #f8f9fa;            /* 更柔和的背景色 */
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --text-color: #212529;          /* 略微柔和的黑色 */
    --text-light-color: #6c757d;    /* 更柔和的灰色 */
    --accent-color: #007bff;
    --border-color: #e9ecef;
    --shadow-color: rgba(0, 0, 0, 0.04); /* 更细微的阴影 */
    --warning-color: #ffc107;
    --danger-color: #dc3545;

    /* 字体 */
    --font-family: 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

    /* 圆角变量，用于统一UI风格 */
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-pill: 50rem;

    /* 可主题化的UI组件变量 */
    --search-focus-shadow: rgba(0, 123, 255, 0.1);
    --btn-secondary-bg: #f1f3f5;
    --btn-secondary-hover-bg: #e9ecef;
    --placeholder-bg: #f1f3f5;
    --placeholder-border: var(--accent-color);
    --slider-bg: #ccc;
}

html[data-theme='dark'] {
    /* 暗色模式下的颜色变量覆写 */
    --bg-color: #181a1e;
    --sidebar-bg: #212529;
    --card-bg: #212529;
    --text-color: #e9ecef;
    --text-light-color: #adb5bd;
    --accent-color: #0d6efd;
    --border-color: #343a40;
    --shadow-color: rgba(0, 0, 0, 0.15);
    --warning-color: #ffca2c;
    --danger-color: #f15c6b;

    /* 暗色模式下的UI组件变量 */
    --search-focus-shadow: rgba(13, 110, 253, 0.25);
    --btn-secondary-bg: #343a40;
    --btn-secondary-hover-bg: #495057;
    --placeholder-bg: #343a40;
    --slider-bg: #555;
}

body {
    margin: 0;
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* ==========================================================================
   2. 页面布局 (Layout)
   ========================================================================== */
.container {
    display: flex;
}

.sidebar {
    width: 240px;
    background-color: var(--sidebar-bg);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    transition: all 0.3s ease;
    z-index: 100;
    display: flex;
    flex-direction: column;
}

.main-content {
    margin-left: 240px;
    width: calc(100% - 240px);
    box-sizing: border-box;
    transition: margin-left 0.3s ease;
}

.main-content-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    box-sizing: border-box;
}

/* ==========================================================================
   3. 增强搜索 (Enhanced Search)
   ========================================================================== */
.enhanced-search-header {
    background-color: var(--card-bg);
    padding: 24px;
    border-radius: var(--border-radius-xl);
    margin-bottom: 32px;
    box-shadow: 0 6px 24px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.category-btn {
    padding: 6px 16px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-color);
    border-radius: var(--border-radius-pill);
    transition: all 0.2s;
}

.category-btn:hover {
    background-color: var(--btn-secondary-bg);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.category-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(0);
}

.search-engines {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.3s;
}

.engine-checkbox {
    display: flex;
    align-items: center;
    font-size: 14px;
    cursor: pointer;
    user-select: none;
}

.engine-checkbox input {
    margin-right: 8px;
    cursor: pointer;
}

.search-form {
    display: flex;
    gap: 12px;
}

.search-input-wrapper {
    position: relative;
    flex-grow: 1;
}

#search-input {
    width: 100%;
    padding: 14px 20px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-sizing: border-box;
    transition: all 0.3s;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#search-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px var(--search-focus-shadow);
}

#search-input::placeholder {
    color: var(--text-light-color);
    opacity: 0.8;
}

.suggestions-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    list-style: none;
    padding: 8px 0;
    margin: 0;
    z-index: 10;
    box-shadow: 0 8px 24px var(--shadow-color);
    max-height: 300px;
    overflow-y: auto;
    display: none;
}

.suggestion-item {
    padding: 10px 20px;
    transition: background-color 0.2s;
}

.suggestion-item:hover {
    background-color: var(--btn-secondary-bg);
}

/* ==========================================================================
   4. 侧边栏 (Sidebar)
   ========================================================================== */
.sidebar > div:first-child {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    padding: 0 20px 20px;
    color: var(--accent-color);
    flex-shrink: 0;
}

.category-list {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex-grow: 1;
}

.category-list a {
    display: block;
    padding: 12px 24px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 15px;
    transition: background-color 0.2s, color 0.2s;
    border-left: 3px solid transparent;
}

.category-list a:hover {
    background-color: var(--btn-secondary-bg);
}

.category-list a.active {
    color: var(--accent-color);
    background-color: var(--btn-secondary-bg);
    font-weight: 600;
    border-left-color: var(--accent-color);
}

.menu-bottom-section {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    transition: border-color 0.3s, padding 0.3s;
    flex-shrink: 0;
}

.data-actions {
    display: flex;
    width: 100%;
    gap: 10px;
}

.data-actions button {
    flex-grow: 1;
    padding: 8px;
    font-size: 14px;
    border-radius: var(--border-radius-sm);
}

/* 4.1. 自定义数据源选择器 (Custom Select) */
.data-source-selector {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
}

.data-source-selector label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light-color);
    padding-left: 2px;
}

.custom-select {
    position: relative;
    width: 100%;
    user-select: none;
    outline: none;
}

.custom-select-trigger {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.custom-select:focus-within .custom-select-trigger {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--search-focus-shadow);
}

.custom-select-arrow {
    width: 8px;
    height: 8px;
    border: 0 solid var(--text-light-color);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    transition: transform 0.3s ease;
    margin-left: 10px;
}

.custom-select.open .custom-select-arrow {
    transform: translateY(2px) rotate(-135deg);
}

.custom-select-options {
    position: absolute;
    bottom: calc(100% + 5px);
    left: 0;
    right: 0;
    background-color: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: 0 8px 16px var(--shadow-color);
    z-index: 101;
    max-height: 250px;
    overflow-y: auto;
    display: none;
    padding: 5px 0;
}

.custom-select.open .custom-select-options {
    display: block;
}

.custom-select-option {
    padding: 10px 15px;
    transition: background-color 0.2s, color 0.2s;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.custom-select-option:hover {
    background-color: var(--btn-secondary-bg);
}

.custom-select-option.selected {
    background-color: var(--accent-color);
    color: white;
    font-weight: 500;
}

/* 4.2. 社交链接和暗色模式开关 */
.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--btn-secondary-bg);
    color: var(--text-light-color);
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.2s, color 0.2s;
}

.social-links a:hover {
    background-color: var(--btn-secondary-hover-bg);
    color: var(--text-color);
}

.dark-mode-toggle label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.dark-mode-toggle input[type="checkbox"] {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.dark-mode-toggle .slider {
    position: relative;
    width: 44px;
    height: 24px;
    background-color: var(--slider-bg);
    border-radius: 12px;
    transition: background-color 0.3s;
}

.dark-mode-toggle .slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    left: 2px;
    top: 2px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.dark-mode-toggle input:checked + .slider {
    background-color: var(--accent-color);
}

.dark-mode-toggle input:checked + .slider::before {
    transform: translateX(20px);
}

.sun-icon-emoji, .moon-icon-emoji {
    font-size: 18px;
    line-height: 1;
}

.copyright {
    font-size: 12px;
    color: var(--text-light-color);
    text-align: center;
    margin-bottom: 20px;
}

/* ==========================================================================
   5. 内容区域和卡片 (Content & Cards)
   ========================================================================== */
.category-section {
    margin-bottom: 40px;
}

.category-title-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 24px;
    transition: border-color 0.3s;
}

.category-title {
    font-size: 24px;
    font-weight: 600;
    margin: 0;
}

.title-actions .action-btn {
    background-color: var(--btn-secondary-bg);
    border: none;
    padding: 8px 16px;
    font-size: 14px;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s;
    margin-left: 10px;
    color: var(--text-color);
}

.title-actions .action-btn:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* 标题栏中的危险按钮的特定样式 */
.title-actions .action-btn.btn-danger {
    background-color: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.title-actions .action-btn.btn-danger:hover {
    background-color: var(--danger-color);
    color: #fff;
    border-color: var(--danger-color);
}

.title-actions .action-btn.active {
    background-color: var(--accent-color);
    color: white;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    min-height: 100px; /* 保证拖拽区域有效 */
}

.card {
    position: relative;
    background-color: var(--card-bg);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 16px var(--shadow-color);
    padding: 16px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s, border-color 0.2s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    user-select: none;
    border: 1px solid transparent;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px var(--shadow-color);
    border-color: var(--accent-color);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.card-icon {
    width: 36px;
    height: 36px;
    margin-right: 16px;
    flex-shrink: 0;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-desc {
    font-size: 13px;
    color: var(--text-light-color);
    flex-grow: 1;
    margin: 0;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 39px; /* 2行文字的高度 */
}

.proxy-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: var(--warning-color);
    color: #212529;
    font-size: 10px;
    font-weight: bold;
    padding: 3px 8px;
    border-radius: var(--border-radius-pill);
    user-select: none;
}

/* ==========================================================================
   6. 交互状态 (Interactive States)
   ========================================================================== */
/* 卡片拖拽时的样式 */
.card.dragging {
    opacity: 0.5;
    background: #cce5ff;
}

/* 拖拽时的占位符样式 */
.placeholder {
    background-color: var(--placeholder-bg);
    border: 2px dashed var(--placeholder-border);
    border-radius: var(--border-radius-xl);
    box-sizing: border-box;
}

/* 编辑模式下卡片晃动动画 */
@keyframes wobble {
    0% { transform: rotate(0deg); }
    25% { transform: rotate(-1.5deg); }
    50% { transform: rotate(1.5deg); }
    75% { transform: rotate(-1.5deg); }
    100% { transform: rotate(0deg); }
}

.content-wrapper.is-editing .custom-source-section .card {
    animation: wobble 0.5s infinite;
    cursor: grab;
}

.content-wrapper.is-editing .custom-source-section .card:hover {
    animation-play-state: paused; /* 悬停时暂停动画 */
}

/* 删除模式下卡片样式和覆盖层 */
.content-wrapper.is-deleting .custom-source-section .card {
    cursor: pointer;
}

.content-wrapper.is-deleting .custom-source-section .card:hover {
    transform: none; /* 覆盖默认的悬停效果 */
    box-shadow: 0 4px 12px var(--shadow-color);
    border-color: transparent;
}

.content-wrapper.is-deleting .custom-source-section .card::after {
    content: '🗑️';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(220, 53, 69, 0.7);
    border-radius: var(--border-radius-xl);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 40px;
    color: white;
    transition: background-color 0.2s;
}

.content-wrapper.is-deleting .custom-source-section .card:hover::after {
    background-color: rgba(220, 53, 69, 0.85); /* 悬停时加深覆盖层 */
}


/* ==========================================================================
   7. 模态框 (Modal) & 按钮 (Buttons)
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

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

.modal-content {
    background: var(--sidebar-bg);
    padding: 30px 35px;
    border-radius: var(--border-radius-xl);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: scale(1);
    transition: transform 0.3s ease, background-color 0.3s;
}

.modal-hidden .modal-content {
    transform: scale(0.9);
}

#modal-title, #alert-confirm-title {
    margin-top: 0;
    margin-bottom: 24px;
    font-size: 22px;
}

.modal-body {
    margin-bottom: 25px;
    line-height: 1.7;
    color: var(--text-color);
}
.modal-body p {
    margin: 0;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="url"],
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 16px;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s;
}

.form-group input[type="text"]:focus,
.form-group input[type="url"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px var(--search-focus-shadow);
}


.form-group-checkbox {
    display: flex;
    align-items: center;
}

.form-group-checkbox input {
    margin-right: 10px;
}

.form-error-message {
    color: var(--danger-color);
    font-size: 14px;
    margin-top: 5px;
}

.form-actions {
    margin-top: 25px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* 按钮通用样式 */
button, .btn-primary, .btn-secondary, .btn-danger, #search-button {
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: background-color 0.2s, transform 0.1s, color 0.2s, border-color 0.2s, opacity 0.2s;
    cursor: pointer;
}
button:active, .btn-primary:active, .btn-secondary:active, #search-button:active {
    transform: scale(0.98);
}
button:disabled, .btn-danger:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

/* 主按钮 */
.btn-primary {
    background-color: var(--accent-color);
    color: white;
}
.btn-primary:hover:not(:disabled) {
    background-color: #0069d9;
}
html[data-theme='dark'] .btn-primary:hover:not(:disabled) {
    background-color: #0b5ed7;
}

/* 次要按钮 */
.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover:not(:disabled) {
    background-color: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

/* 危险按钮 */
.btn-danger {
    background-color: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}
.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-color);
    color: #fff;
}
.btn-danger:disabled {
    color: var(--text-light-color);
    border-color: var(--text-light-color);
    background-color: transparent;
}


/* ==========================================================================
   8. 致谢部分 (Acknowledgements Section)
   ========================================================================== */
.acknowledgements-section {
    margin-top: 40px;
    padding: 24px 30px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 6px 24px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.acknowledgements-title {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 20px 0;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.3s;
}

.acknowledgements-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.ack-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 12px 16px;
    height: 50px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    text-align: center;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.ack-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-color);
    border-color: var(--accent-color);
}

.ack-card-title {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-color);
    transition: color 0.2s ease;
}

.ack-card-subtitle {
    font-size: 12px;
    color: var(--text-light-color);
    margin-top: 4px;
}

/* ==========================================================================
   9. 响应式设计 (Responsive Design)
   ========================================================================== */
@media (max-width: 768px) {
    /* 隐藏桌面版侧边栏的主体部分 */
    .sidebar > div:first-child {
        display: none;
    }
    .copyright {
        margin-bottom: 0;
    }

    /* 侧边栏变为底部导航栏 */
    .sidebar {
        width: 100%;
        height: auto;
        top: auto;
        bottom: 0;
        border-right: none;
        border-top: 1px solid var(--border-color);
        padding: 0;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.05);
    }
    html[data-theme='dark'] .sidebar {
        box-shadow: 0 -4px 12px rgba(0,0,0,0.2);
    }

    /* 底部功能区变为横向排列 */
    .menu-bottom-section {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-evenly;
        align-items: center;
        padding: 10px;
        border-top: none;
        gap: 10px 20px;
    }

    /* 数据源选择器单独占一行 */
    .data-source-selector {
        order: 3; /* 调整显示顺序 */
        flex-basis: 100%;
        flex-direction: row;
        align-items: center;
        gap: 10px;
        justify-content: center;
        padding: 5px 0;
        border-top: 1px solid var(--border-color);
        margin-top: 8px;
    }
    .custom-select {
        max-width: 200px;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
    }
    .main-content-inner {
        /* 增加底部内边距，防止被底部导航栏遮挡 */
        padding: 15px 15px 150px 15px;
    }

    .enhanced-search-header {
        padding: 16px;
        border-radius: var(--border-radius-lg);
    }
    .search-form {
        flex-direction: column;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .category-title {
        font-size: 20px;
    }

    .acknowledgements-section {
        padding: 15px 20px;
        border-radius: var(--border-radius-lg);
    }
    .acknowledgements-title {
        font-size: 20px;
    }
    .acknowledgements-card-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
}

/* ==========================================================================
   10. 滚动条样式 (Scrollbar Styles)
   ========================================================================== */
/* 适用于 Webkit 内核浏览器 (Chrome, Safari, Edge) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    /* 滚动条轨道背景透明 */
    background: transparent;
}

::-webkit-scrollbar-thumb {
    /* 滚动条滑块 */
    background-color: var(--text-light-color);
    border-radius: var(--border-radius-pill);
    border: 2px solid var(--bg-color); /* 创建边框效果，使滑块看起来更细 */
    background-clip: padding-box;
}

/* 在侧边栏中，滑块边框颜色应与侧边栏背景一致 */
.sidebar ::-webkit-scrollbar-thumb {
    border-color: var(--sidebar-bg);
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--accent-color);
}