/* ===== 暗黑模式 CSS 变量 ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-code: #f1f3f5;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --link-color: #0d6efd;
    --link-hover: #0a58ca;
    --shadow-color: rgba(0,0,0,0.08);
    --article-text: #2c3e50;
    --article-heading: #1a1a1a;
    --parchment-bg: #f4ecd8;
    --parchment-text: #3e2f1c;
    --parchment-heading: #2c1e0e;
    --dropdown-bg: #ffffff;
    --dropdown-hover: #f8f9fa;
    --book-tag-bg: #e8f0fe;
    --book-tag-text: #1a73e8;
    --card-bg: #ffffff;
    --badge-bg: #f8f9fa;
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #16213e;
    --bg-input: #1e2a4a;
    --bg-code: #0d1117;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-muted: #888888;
    --border-color: #2a3a5c;
    --link-color: #64b5f6;
    --link-hover: #90caf9;
    --shadow-color: rgba(0,0,0,0.3);
    --article-text: #d0d0d0;
    --article-heading: #e8e8e8;
    --parchment-bg: #1e2a4a;
    --parchment-text: #c0c0c0;
    --parchment-heading: #e0e0e0;
    --dropdown-bg: #16213e;
    --dropdown-hover: #1e2a4a;
    --book-tag-bg: #1a3a5c;
    --book-tag-text: #64b5f6;
    --card-bg: #16213e;
    --badge-bg: #1e2a4a;
}

/* 全局暗黑模式应用 */
body {
    background-color: var(--bg-primary) !important;
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

.container { transition: background-color 0.3s, color 0.3s; }

/* 卡片 */
.card {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    transition: background-color 0.3s, color 0.3s;
}
.card-title, .card-text { color: var(--text-primary); }
.card .text-muted { color: var(--text-muted) !important; }

/* 链接 */
a { color: var(--link-color); }
a:hover { color: var(--link-hover); }

/* 输入框 */
.form-control, .form-select {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
    transition: background-color 0.3s, color 0.3s;
}

/* 下拉菜单 */
.dropdown-menu {
    background-color: var(--dropdown-bg) !important;
    border-color: var(--border-color) !important;
}
.dropdown-item { color: var(--text-primary); }
.dropdown-item:hover { background-color: var(--dropdown-hover) !important; }

/* 面包屑 */
.breadcrumb-item a { color: var(--text-muted); }

/* 页脚 */
footer { color: var(--text-muted) !important; }
footer small { color: var(--text-muted) !important; }

/* 徽章 */
.badge { transition: background-color 0.3s, color 0.3s; }

/* 分页 */
.page-link {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--link-color) !important;
}
.page-item.active .page-link {
    background-color: var(--link-color) !important;
    border-color: var(--link-color) !important;
}

/* 代码块 */
pre, code {
    background-color: var(--bg-code) !important;
    color: var(--text-primary) !important;
    transition: background-color 0.3s;
}

/* 表格 */
.table {
    color: var(--text-primary) !important;
}
.table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--bg-secondary) !important;
}
.table-bordered th, .table-bordered td {
    border-color: var(--border-color) !important;
}

/* 列表 */
.list-group-item {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

/* 移动端卡片 */
.article-card .card-title a { color: var(--text-primary); }
.article-card .card-meta { color: var(--text-muted); }
.article-card .card-summary { color: var(--text-secondary); }
.article-card .book-tag {
    background: var(--book-tag-bg) !important;
    color: var(--book-tag-text) !important;
}

/* 暗黑模式切换按钮 */
.theme-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 4px 8px;
    color: rgba(255,255,255,0.85);
    transition: transform 0.2s;
    line-height: 1;
}
.theme-toggle:hover { transform: scale(1.15); }

/* ===== 文章内容排版优化 ===== */
.article-content {
    font-size: 1.15rem;
    line-height: 1.8;
    white-space: normal;
    text-align: justify;
    font-family: "Noto Serif SC", "Source Han Serif CN", "PingFang SC", "Microsoft YaHei", Georgia, serif;
    color: var(--article-text);
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
    padding: 1em 0;
}

/* 段落样式 - 关键优化 */
.article-content p {
    margin-top: 0;
    margin-bottom: 2.2em;  /* 段落间距：明显大于行距 */
    text-indent: 2em;       /* 首行缩进2个字符 */
    line-height: 1.8;       /* 行间距 */
    text-align: justify;
    orphans: 3;
    widows: 3;
}

/* 文章内标题样式 */
.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    font-weight: 600;
    margin-top: 2.5em;
    margin-bottom: 1.5em;
    line-height: 1.4;
    color: var(--article-heading);
    text-indent: 0;
    text-align: left;
}

.article-content h1 { font-size: 2rem; }
.article-content h2 { font-size: 1.75rem; }
.article-content h3 { font-size: 1.5rem; }
.article-content h4 { font-size: 1.25rem; }

/* 移动端适配 */
@media (max-width: 768px) {
    .article-content {
        font-size: 1.05rem;
        line-height: 1.8;
    }
    
    .article-content p {
        text-indent: 2em;
        margin-bottom: 1.8em;
        line-height: 1.8;
    }
    
    .article-content h1 { font-size: 1.5rem; }
    .article-content h2 { font-size: 1.3rem; }
    .article-content h3 { font-size: 1.15rem; }
}

/* 卡片样式 */
.article-card {
    border: none;
    border-radius: 12px;
}

.card {
    border-radius: 8px;
}

/* 全局标题优化 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    font-family: "Noto Serif SC", "Source Han Serif CN", serif;
}

/* 面包屑导航优化 */
.breadcrumb {
    background-color: transparent;
    padding: 0.75rem 0;
    font-size: 0.9rem;
}

.breadcrumb-item a {
    color: #6c757d;
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb-item a:hover {
    color: #0d6efd;
}

/* 按钮样式优化 */
.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* 徽章样式优化 */
.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
}

/* 羊皮卷主题 */
.bg-parchment { background-color: #f4ecd8 !important; }
.bg-parchment .article-content { color: #3e2f1c; }
.bg-parchment .article-content h1,
.bg-parchment .article-content h2,
.bg-parchment .article-content h3,
.bg-parchment .article-content h4 { color: #2c1e0e; }

/* 移动端适配 - 增强版 */
@media (max-width: 768px) {
    .article-content {
        font-size: 1rem !important;
        line-height: 1.7;
        padding: 15px;
    }
    
    .article-content p {
        text-indent: 2em;
        margin-bottom: 1.8em;
        line-height: 1.7;
    }
    
    .article-content h1 { font-size: 1.5rem; }
    .article-content h2 { font-size: 1.3rem; }
    .article-content h3 { font-size: 1.15rem; }
    
    /* 按钮最小触摸尺寸 44px */
    .btn {
        min-height: 44px;
        min-width: 44px;
    }
}

/* 导航栏始终深色不受主题影响 */
.navbar { z-index: 1030; }



/* 回到顶部按钮 - 暗黑模式适配 */
[data-theme="dark"] #back-to-top {
    background: #495057;
}

/* 移动端回到顶部按钮 */
@media (max-width: 767.98px) {
    #back-to-top {
        bottom: 70px !important;
        right: 15px !important;
    }
}

/* Loading spinner 颜色 */
[data-theme="dark"] #global-loading {
    background: #2a2a2a;
    color: #e0e0e0;
}

/* 导航栏暗黑模式 */
[data-theme="dark"] nav.navbar-dark.bg-dark {
    background-color: #0f0f23 !important;
}
[data-theme="dark"] nav.navbar-dark.bg-primary {
    background-color: #0f0f23 !important;
}
[data-theme="dark"] .dropdown-menu {
    background-color: var(--dropdown-bg, #16213e) !important;
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] .dropdown-item {
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .dropdown-item:hover {
    background-color: var(--dropdown-hover, #1e2a4a) !important;
}
[data-theme="dark"] .dropdown-item-text {
    color: var(--text-secondary, #b0b0b0) !important;
}
[data-theme="dark"] .form-control {
    background-color: var(--bg-input, #1e2a4a) !important;
    color: var(--text-primary, #e0e0e0) !important;
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted, #888) !important;
}

/* 暗黑模式 — 全局文字/背景/卡片/列表 */
[data-theme="dark"] body,
[data-theme="dark"] .container {
    background-color: var(--bg-primary, #1a1a2e) !important;
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .card {
    background-color: var(--bg-card, #16213e) !important;
    border-color: var(--border-color, #2a3a5c) !important;
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .card-body {
    background-color: var(--bg-card, #16213e) !important;
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .card-title,
[data-theme="dark"] .card-text,
[data-theme="dark"] .card-title a {
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .card-title a:hover {
    color: var(--link-hover, #90caf9) !important;
}
[data-theme="dark"] .card-meta,
[data-theme="dark"] .card-summary,
[data-theme="dark"] .text-muted {
    color: var(--text-muted, #888) !important;
}
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] p, [data-theme="dark"] span, [data-theme="dark"] li,
[data-theme="dark"] td, [data-theme="dark"] th, [data-theme="dark"] label,
[data-theme="dark"] small, [data-theme="dark"] div {
    color: var(--text-primary, #e0e0e0);
}
/* 分享卡片不受暗色模式影响 */
.art-share-card-root,
.art-share-card-root p, .art-share-card-root span, .art-share-card-root div,
.art-share-card-root small, .art-share-card-root label {
    color: inherit !important;
}
[data-theme="dark"] a {
    color: var(--link-color, #64b5f6);
}
[data-theme="dark"] .btn-outline-light {
    color: var(--text-primary, #e0e0e0) !important;
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] .btn-outline-light:hover {
    background-color: var(--bg-card, #16213e) !important;
}
[data-theme="dark"] .btn-outline-secondary {
    color: var(--text-secondary, #b0b0b0) !important;
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] .badge.bg-light {
    background-color: var(--badge-bg, #1e2a4a) !important;
    color: var(--text-secondary, #b0b0b0) !important;
}
[data-theme="dark"] .badge.bg-info {
    background-color: #1a3a5c !important;
    color: #64b5f6 !important;
}
[data-theme="dark"] hr {
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] .bg-light,
[data-theme="dark"] .list-group-item {
    background-color: var(--bg-secondary, #16213e) !important;
    color: var(--text-primary, #e0e0e0) !important;
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] .table {
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .table td,
[data-theme="dark"] .table th {
    border-color: var(--border-color, #2a3a5c) !important;
}
[data-theme="dark"] footer {
    background-color: var(--bg-primary, #1a1a2e) !important;
}
[data-theme="dark"] .modal-content {
    background-color: var(--bg-card, #16213e) !important;
    color: var(--text-primary, #e0e0e0) !important;
}
[data-theme="dark"] .form-select {
    background-color: var(--bg-input, #1e2a4a) !important;
    color: var(--text-primary, #e0e0e0) !important;
    border-color: var(--border-color, #2a3a5c) !important;
}
/* 底部导航暗黑模式 */
[data-theme="dark"] nav.navbar-dark.bg-primary.fixed-bottom {
    background-color: #0f0f23 !important;
}
[data-theme="dark"] .bottom-nav-item div {
    color: rgba(255,255,255,0.7) !important;
}
[data-theme="dark"] .bottom-nav-item.active div {
    color: #fff !important;
}