:root {
    /* 主题色 - 可通过JS动态修改 */
    --primary-color: #333;
    --bg-color: #fafafa;
    --card-bg: #ffffff;
    --card-hover-bg: #f5f5f5;
    --border-color: #eaeaea;
    --text-color: #333;
    --text-secondary: #666;
    --accent-color: #4a90d9;

    /* 阴影 */
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);

    /* 过渡动画 */
    --transition-duration: 0.3s;
    --transition: all var(--transition-duration) ease;

    /* 圆角 */
    --border-radius: 12px;
    --border-radius-sm: 6px;
    --border-radius-tag: 4px;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --header-size: 2rem;
    --header-size-mobile: 1.6rem;
    --title-size: 1.1rem;
    --desc-size: 0.85rem;
    --tag-size: 0.75rem;
    --badge-size: 0.7rem;

    /* 布局 */
    --container-max-width: 600px;
    --container-padding: 40px 20px;
    --container-padding-mobile: 24px 16px;
    --card-padding: 20px 24px;
    --card-padding-mobile: 16px 18px;
    --card-gap: 12px;
    --icon-size: 48px;
    --icon-size-mobile: 40px;
}

/* 深色主题 - 黑灰配色 */
html[data-theme="dark"] {
    --primary-color: #e5e5e5 !important;
    --bg-color: #121212 !important;
    --card-bg: #1e1e1e !important;
    --card-hover-bg: #2a2a2a !important;
    --border-color: #333333 !important;
    --text-color: #e5e5e5 !important;
    --text-secondary: #999999 !important;
    --accent-color: #888888 !important;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.4) !important;
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.5) !important;
}

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

/* 隐藏滚动条 */
::-webkit-scrollbar {
    display: none;
}

html, body {
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: var(--container-padding);
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    position: relative;
}

/* 主题切换按钮 */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    transition: all 0.3s ease;
    z-index: 100;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-hover);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: all 0.3s ease;
}

.theme-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0deg);
}

.theme-toggle .icon-moon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0deg);
}

.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-size: var(--header-size);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

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

.nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--card-gap);
}

.nav-item {
    display: flex;
    align-items: flex-start;
    padding: var(--card-padding);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-color);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-item:hover {
    background: var(--card-hover-bg);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.nav-icon {
    width: var(--icon-size);
    height: var(--icon-size);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border-radius: 10px;
    margin-right: 16px;
    font-size: 1.5rem;
    flex-shrink: 0;
    transition: background-color 0.3s ease;
}

.nav-content {
    flex: 1;
    min-width: 0;
}

.nav-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
    flex-wrap: wrap;
}

.nav-title {
    font-size: var(--title-size);
    font-weight: 500;
}

/* 徽章样式 */
.nav-badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: var(--badge-size);
    font-weight: 500;
    border-radius: var(--border-radius-tag);
    background: var(--accent-color);
    color: #fff;
    transition: background 0.2s;
}

.nav-badge.new {
    background: #52c41a;
}

.nav-badge.hot {
    background: #ff4d4f;
}

.nav-badge.update {
    background: #faad14;
    color: #333;
}

.nav-desc {
    font-size: var(--desc-size);
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

/* 标签样式 */
.nav-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.nav-tag {
    display: inline-block;
    padding: 2px 8px;
    font-size: var(--tag-size);
    background: var(--bg-color);
    color: var(--text-secondary);
    border-radius: var(--border-radius-tag);
    border: 1px solid var(--border-color);
}

/* 更新时间 */
.nav-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
    font-size: var(--tag-size);
    color: var(--text-secondary);
}

.nav-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-arrow {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition);
    align-self: center;
    margin-left: 8px;
}

.nav-item:hover .nav-arrow {
    transform: translateX(4px);
}

.footer {
    text-align: center;
    margin-top: 60px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* 状态样式 */
.nav-item[data-status="inactive"] {
    opacity: 0.6;
    pointer-events: auto;
    cursor: not-allowed;
    background: repeating-linear-gradient(135deg,
            var(--card-hover-bg),
            var(--card-hover-bg) 10px,
            var(--card-bg) 10px,
            var(--card-bg) 20px);
    box-shadow: none;
    border-style: dashed;
    position: relative;
}

.nav-item[data-status="inactive"]::after {
    content: attr(data-banmsg);
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: var(--tag-size);
    color: #ff4d4f;
    background: var(--card-bg);
    padding: 2px 6px;
    border-radius: var(--border-radius-tag);
    font-weight: bold;
    z-index: 2;
}

/* 响应式 */
@media (max-width: 480px) {
    body {
        padding: var(--container-padding-mobile);
    }

    .header h1 {
        font-size: var(--header-size-mobile);
    }

    .nav-item {
        padding: var(--card-padding-mobile);
    }

    .nav-icon {
        width: var(--icon-size-mobile);
        height: var(--icon-size-mobile);
        font-size: 1.2rem;
    }

    .nav-tags {
        gap: 4px;
    }

    .nav-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

/* ============================================
   Tag 筛选条（方案一）
============================================ */

.tag-filter {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
    padding: 0;
    margin: -8px 0 20px 0;
}

.tag-filter::-webkit-scrollbar {
    display: none;
}

.tag-filter::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 999px;
}

.tag-filter-skeleton {
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding: 6px 0;
}

.tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 4px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease;
    user-select: none;
    white-space: nowrap;
}

.tag-chip:hover {
    color: var(--text-color);
    background: var(--card-hover-bg);
}

.tag-chip.active {
    background: var(--text-color);
    color: var(--bg-color);
}

.tag-chip .tag-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 3px;
    border: none;
    font-size: 0.7rem;
    line-height: 16px;
    opacity: 0.7;
    background: transparent;
}

.tag-chip.active .tag-count {
    opacity: 0.8;
    background: transparent;
    color: inherit;
}

/* 空状态 */
.nav-empty {
    text-align: center;
    padding: 40px 16px;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius);
}

/* 小屏：让筛选条更贴手 */
@media (max-width: 480px) {
    .tag-filter {
        margin: -8px 0 14px 0;
    }

    .tag-chip {
        padding: 6px 10px;
        font-size: 0.82rem;
    }
}