/* ============================================================
 * DuShiGe（读诗阁）· 主样式表
 * ------------------------------------------------------------
 * 设计规范：
 *   配色：浅米色 #FAF8F5 / 深棕 #2C1810 / 灰绿 #6B7B6B / 暖深灰 #3D2B1F
 *   字体：标题用思源宋体/楷体，正文用微软雅黑/系统无衬线
 *   风格：简约雅致、书卷气、留白充足
 *   圆角：按钮/卡片 8~12px；阴影：轻微投影增加层次
 *   响应式：PC 优先，移动端基本可用
 * ============================================================ */

/* ---------- 1. 全局变量 ---------- */
:root {
    --dsg-bg: #FAF8F5;          /* 页面主背景（浅米色） */
    --dsg-bg-deep: #F2EBE0;     /* 深一档的米色背景 */
    --dsg-brown: #2C1810;       /* 深棕（主色/标题） */
    --dsg-green: #6B7B6B;       /* 灰绿（强调/作者） */
    --dsg-gray: #3D2B1F;        /* 暖深灰（正文） */
    --dsg-muted: #8A7A6B;       /* 次级文字 */
    --dsg-border: #E6DDD0;      /* 边框/分隔线 */
    --dsg-white: #FFFFFF;
    --dsg-radius: 10px;         /* 圆角 */
    --dsg-radius-sm: 8px;
    --dsg-shadow: 0 2px 10px rgba(44, 24, 16, 0.06);    /* 轻微投影 */
    --dsg-shadow-hover: 0 6px 20px rgba(44, 24, 16, 0.10);
    --dsg-font-title: "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", "KaiTi", serif; /* 标题：宋体/楷体 */
    --dsg-font-body: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;                    /* 正文：无衬线 */
    --dsg-header-h: 64px;
}

/* ---------- 2. 基础重置 ---------- */
* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font-family: var(--dsg-font-body);
    font-size: 16px;
    line-height: 1.8;
    color: var(--dsg-gray);
    background: var(--dsg-bg);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--dsg-font-title);
    color: var(--dsg-brown);
    line-height: 1.4;
    margin: 0 0 12px;
}

p { margin: 0 0 12px; }

a { color: var(--dsg-green); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--dsg-brown); }

img { max-width: 100%; height: auto; }

ul, ol { margin: 0; padding: 0; list-style: none; }

/* ---------- 3. 通用布局容器 ---------- */
.dsg-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

.dsg-main { min-height: 60vh; }

/* ---------- 4. 顶部导航栏 ---------- */
.dsg-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 248, 245, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--dsg-border);
}

.dsg-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--dsg-header-h);
}

/* 站点 Logo */
.dsg-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--dsg-font-title);
    font-size: 20px;
    font-weight: 700;
    color: var(--dsg-brown);
}
.dsg-logo img { border-radius: 8px; display: block; }
.dsg-logo:hover { color: var(--dsg-brown); }

/* 主导航 */
.dsg-nav ul { display: flex; gap: 8px; }

.dsg-nav a {
    display: block;
    padding: 8px 16px;
    border-radius: var(--dsg-radius-sm);
    color: var(--dsg-gray);
    font-size: 15px;
}
.dsg-nav a:hover { background: var(--dsg-bg-deep); color: var(--dsg-brown); }
.dsg-nav a.is-active { background: var(--dsg-brown); color: #FAF8F5; }

/* 移动端菜单按钮（默认隐藏） */
.dsg-nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--dsg-border);
    border-radius: var(--dsg-radius-sm);
    font-size: 20px;
    line-height: 1;
    padding: 6px 10px;
    cursor: pointer;
    color: var(--dsg-brown);
}

/* ---------- 5. 按钮 ---------- */
.dsg-btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: var(--dsg-radius);
    font-size: 15px;
    line-height: 1.6;
    text-align: center;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all .2s ease;
    user-select: none;
}
.dsg-btn-sm { padding: 6px 16px; font-size: 14px; }
.dsg-btn-lg { padding: 14px 34px; font-size: 17px; }

/* 主按钮：深棕底 */
.dsg-btn-primary {
    background: var(--dsg-brown);
    color: #FAF8F5;
}
.dsg-btn-primary:hover { background: #43261A; color: #FFF; box-shadow: var(--dsg-shadow-hover); transform: translateY(-1px); }

/* 描边按钮 */
.dsg-btn-ghost {
    background: transparent;
    border-color: var(--dsg-brown);
    color: var(--dsg-brown);
}
.dsg-btn-ghost:hover { background: var(--dsg-brown); color: #FAF8F5; }

/* 禁用状态 */
.dsg-btn-disabled,
.dsg-btn.disabled { opacity: .55; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

/* ---------- 6. Hero 区 ---------- */
.dsg-hero {
    padding: 84px 0 72px;
    text-align: center;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(107, 123, 107, 0.10), transparent 55%),
        radial-gradient(ellipse at 80% 100%, rgba(44, 24, 16, 0.08), transparent 55%),
        linear-gradient(180deg, var(--dsg-bg) 0%, var(--dsg-bg-deep) 100%);
    border-bottom: 1px solid var(--dsg-border);
}

.dsg-hero-title {
    font-size: 56px;
    letter-spacing: 6px;
    margin-bottom: 18px;
}

.dsg-hero-sub {
    font-size: 20px;
    color: var(--dsg-green);
    font-family: var(--dsg-font-title);
    margin-bottom: 14px;
    letter-spacing: 1px;
}

.dsg-hero-desc {
    max-width: 560px;
    margin: 0 auto 30px;
    color: var(--dsg-muted);
    font-size: 16px;
}

.dsg-hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.dsg-hero-tip { color: var(--dsg-muted); font-size: 13px; }

/* ---------- 7. 通用区块 ---------- */
.dsg-section { padding: 64px 0; }

.dsg-section-title {
    font-size: 30px;
    text-align: center;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.dsg-section-sub {
    text-align: center;
    color: var(--dsg-muted);
    margin-bottom: 36px;
}

/* 网格布局 */
.dsg-grid {
    display: grid;
    gap: 24px;
}
.dsg-grid-4 { grid-template-columns: repeat(4, 1fr); }
.dsg-grid-3 { grid-template-columns: repeat(3, 1fr); }

/* 卡片 */
.dsg-card {
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 12px;
    padding: 28px 24px;
    box-shadow: var(--dsg-shadow);
    transition: box-shadow .25s ease, transform .25s ease;
    text-align: center;
}
.dsg-card:hover { box-shadow: var(--dsg-shadow-hover); transform: translateY(-4px); }

.dsg-card-icon {
    font-size: 40px;
    line-height: 1;
    margin-bottom: 14px;
}
.dsg-card h3 { font-size: 18px; margin-bottom: 8px; }
.dsg-card p { color: var(--dsg-muted); font-size: 14px; margin: 0; }

/* ---------- 8. 数据统计区 ---------- */
.dsg-stats {
    background: var(--dsg-brown);
    padding: 48px 0;
}
.dsg-stats-inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    text-align: center;
}
.dsg-stat-num {
    display: block;
    font-family: var(--dsg-font-title);
    font-size: 44px;
    font-weight: 700;
    color: #FAF8F5;
    line-height: 1.2;
}
.dsg-stat-label {
    display: block;
    color: rgba(250, 248, 245, 0.72);
    font-size: 14px;
    letter-spacing: 2px;
    margin-top: 6px;
}

/* ---------- 9. 首页截图轮播 ---------- */
.dsg-carousel {
    position: relative;
    max-width: 820px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 14px;
    border: 1px solid var(--dsg-border);
    background: var(--dsg-white);
    box-shadow: var(--dsg-shadow-hover);
}
.dsg-carousel-track {
    display: flex;
    transition: transform .5s ease;
}
.dsg-carousel-slide { flex: 0 0 100%; }
.dsg-carousel-slide img { display: block; width: 100%; }

.dsg-carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 42px;
    height: 42px;
    border: none;
    border-radius: 50%;
    background: rgba(44, 24, 16, 0.55);
    color: #FAF8F5;
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    transition: opacity .25s ease, background .25s ease;
}
.dsg-carousel:hover .dsg-carousel-btn { opacity: 1; }
.dsg-carousel-btn:hover { background: var(--dsg-brown); }
.dsg-carousel-prev { left: 14px; }
.dsg-carousel-next { right: 14px; }

.dsg-carousel-dots {
    position: absolute;
    bottom: 12px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 8px;
}
.dsg-carousel-dots button {
    width: 10px;
    height: 10px;
    border: none;
    border-radius: 50%;
    background: rgba(250, 248, 245, 0.55);
    cursor: pointer;
    padding: 0;
    transition: background .25s ease, transform .25s ease;
}
.dsg-carousel-dots button.is-active { background: #FAF8F5; transform: scale(1.25); }

/* ---------- 10. 下载 CTA ---------- */
.dsg-download-cta {
    text-align: center;
    background: linear-gradient(180deg, var(--dsg-bg) 0%, var(--dsg-bg-deep) 100%);
    border-top: 1px solid var(--dsg-border);
    padding: 72px 0;
}
.dsg-download-cta h2 { font-size: 32px; letter-spacing: 2px; }
.dsg-download-cta p { color: var(--dsg-muted); margin-bottom: 26px; }

.dsg-version-badge {
    display: inline-block;
    background: var(--dsg-green);
    color: #FFF;
    border-radius: 20px;
    padding: 2px 14px;
    font-size: 14px;
    letter-spacing: 1px;
}

/* ---------- 11. 通用页面头部 ---------- */
.dsg-page-header {
    text-align: center;
    padding: 56px 0 24px;
}
.dsg-page-header h1 { font-size: 36px; letter-spacing: 3px; margin-bottom: 6px; }
.dsg-page-header p { color: var(--dsg-muted); margin: 0; }

/* 独立页面正文 */
.dsg-page { padding-bottom: 64px; }
.dsg-page-content {
    max-width: 820px;
    margin: 0 auto;
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 12px;
    padding: 36px 40px;
    box-shadow: var(--dsg-shadow);
}
.dsg-page-content h2 { margin-top: 28px; }
.dsg-page-content h3 { margin-top: 20px; }
.dsg-page-content ul, .dsg-page-content ol { list-style: disc; padding-left: 24px; }
.dsg-page-content ol { list-style: decimal; }
.dsg-page-content li { margin-bottom: 6px; }

/* ---------- 12. 诗词库：筛选栏 ---------- */
.dsg-library { padding-bottom: 72px; }

.dsg-filter-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin: 8px auto 40px;
    padding: 18px;
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 12px;
    box-shadow: var(--dsg-shadow);
}

.dsg-filter-search { display: flex; gap: 8px; flex: 1 1 280px; max-width: 420px; }

.dsg-filter-bar input[type="search"],
.dsg-filter-bar select {
    height: 38px;
    border: 1px solid var(--dsg-border);
    border-radius: var(--dsg-radius-sm);
    padding: 0 12px;
    font-size: 14px;
    color: var(--dsg-gray);
    background: var(--dsg-bg);
    outline: none;
    transition: border-color .2s ease, box-shadow .2s ease;
}
.dsg-filter-bar input[type="search"] { flex: 1 1 auto; min-width: 0; }
.dsg-filter-bar input[type="search"]:focus,
.dsg-filter-bar select:focus { border-color: var(--dsg-green); box-shadow: 0 0 0 3px rgba(107, 123, 107, 0.15); }

.dsg-filter-selects { display: flex; gap: 10px; flex-wrap: wrap; }
.dsg-filter-selects select { min-width: 118px; cursor: pointer; }

.dsg-filter-reset {
    font-size: 13px;
    color: var(--dsg-muted);
    border-bottom: 1px dashed var(--dsg-muted);
    padding-bottom: 1px;
}
.dsg-filter-reset:hover { color: var(--dsg-brown); border-color: var(--dsg-brown); }

/* ---------- 13. 诗词库：诗词卡片列表 ---------- */
.dsg-poem-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.dsg-poem-card {
    position: relative;
    display: block;
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 12px;
    padding: 24px 20px 20px;
    box-shadow: var(--dsg-shadow);
    transition: box-shadow .25s ease, transform .25s ease, border-color .25s ease;
    text-align: center;
}
.dsg-poem-card:hover {
    box-shadow: var(--dsg-shadow-hover);
    transform: translateY(-4px);
    border-color: var(--dsg-green);
}

.dsg-poem-card-id {
    position: absolute;
    top: 10px;
    left: 12px;
    font-size: 12px;
    color: var(--dsg-muted);
    font-family: "Consolas", "Microsoft YaHei", monospace;
}

.dsg-poem-card-title {
    font-family: var(--dsg-font-title);
    font-size: 20px;
    color: var(--dsg-brown);
    margin: 4px 0 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dsg-poem-card-meta { margin: 0; color: var(--dsg-muted); font-size: 14px; }
.dsg-poem-card-author { color: var(--dsg-green); font-weight: 600; }
.dsg-poem-card-dynasty { color: var(--dsg-muted); }

/* ---------- 14. 分页导航 ---------- */
.dsg-pagination { margin: 44px 0 8px; }
.dsg-pagination ul {
    display: flex;
    justify-content: center;
    gap: 6px;
    flex-wrap: wrap;
}
.dsg-pagination a,
.dsg-pagination span {
    display: block;
    min-width: 40px;
    padding: 8px 12px;
    border: 1px solid var(--dsg-border);
    border-radius: var(--dsg-radius-sm);
    font-size: 14px;
    text-align: center;
    color: var(--dsg-gray);
    background: var(--dsg-white);
    transition: all .2s ease;
}
.dsg-pagination a:hover {
    background: var(--dsg-green);
    border-color: var(--dsg-green);
    color: #FFF;
}
.dsg-pagination .dsg-page-active span {
    background: var(--dsg-brown);
    border-color: var(--dsg-brown);
    color: #FAF8F5;
    font-weight: 600;
}
.dsg-pagination .dsg-page-disabled span { opacity: .45; cursor: not-allowed; }
.dsg-pagination .dsg-page-dots span { border-color: transparent; background: transparent; }

/* ---------- 16. 诗词详情页 ---------- */
.dsg-post { padding-bottom: 72px; }

.dsg-post-header {
    text-align: center;
    padding: 56px 0 8px;
    border-bottom: 1px solid var(--dsg-border);
    margin-bottom: 36px;
}

.dsg-post-title {
    font-size: 40px;
    letter-spacing: 4px;
    margin-bottom: 12px;
}

/* 作者 / 朝代分色显示：作者灰绿、朝代暖深灰 */
.dsg-post-meta { margin: 0 0 14px; font-size: 18px; }
.dsg-post-author {
    font-family: var(--dsg-font-title);
    color: var(--dsg-green);
    font-weight: 700;
}
.dsg-post-dynasty { color: var(--dsg-muted); }

/* 分类标签 */
.dsg-post-tags { margin: 0 0 8px; }
.dsg-tag {
    display: inline-block;
    margin: 4px 6px 4px 0;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 13px;
    background: var(--dsg-bg-deep);
    color: var(--dsg-gray);
}
.dsg-tag-poet { background: rgba(107, 123, 107, 0.16); color: var(--dsg-green); }
.dsg-tag-dynasty { background: rgba(44, 24, 16, 0.08); color: var(--dsg-brown); }
.dsg-tag-theme { background: rgba(138, 122, 107, 0.16); color: var(--dsg-muted); }

/* 正文：居中、留白充足、书卷气 */
.dsg-poem-body {
    max-width: 720px;
    margin: 0 auto 48px;
    text-align: center;
    font-family: var(--dsg-font-title);
    font-size: 20px;
    line-height: 2.2;
    color: var(--dsg-gray);
    letter-spacing: 1px;
}
.dsg-poem-body p { margin: 0 0 20px; }

/* ---------- 17. 详解 Tab ---------- */
.dsg-tabs {
    max-width: 820px;
    margin: 0 auto 48px;
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 12px;
    box-shadow: var(--dsg-shadow);
    overflow: hidden;
}

.dsg-tabs-nav {
    display: flex;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--dsg-border);
    background: var(--dsg-bg);
}

.dsg-tab-btn {
    border: none;
    background: transparent;
    padding: 14px 22px;
    font-size: 15px;
    font-family: var(--dsg-font-title);
    color: var(--dsg-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color .2s ease, border-color .2s ease, background .2s ease;
}
.dsg-tab-btn:hover { color: var(--dsg-brown); background: var(--dsg-bg-deep); }
.dsg-tab-btn.is-active {
    color: var(--dsg-brown);
    font-weight: 700;
    border-bottom-color: var(--dsg-green);
    background: var(--dsg-white);
}

.dsg-tab-panel {
    display: none;
    padding: 28px 32px;
    font-size: 15px;
    line-height: 2;
}
.dsg-tab-panel.is-active { display: block; }
.dsg-tab-panel p { margin: 0 0 14px; }
.dsg-tab-panel p:last-child { margin-bottom: 0; }

/* ---------- 18. 上一篇 / 下一篇 ---------- */
.dsg-post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    max-width: 820px;
    margin: 0 auto 48px;
}
.dsg-post-nav-item {
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 10px;
    padding: 14px 20px;
    font-size: 14px;
    box-shadow: var(--dsg-shadow);
}
.dsg-post-nav-item a { color: var(--dsg-gray); }
.dsg-post-nav-item a:hover { color: var(--dsg-green); }
.dsg-post-next { text-align: right; }

/* ---------- 20. 下载页 ---------- */
.dsg-download-hero {
    max-width: 720px;
    margin: 0 auto 40px;
    text-align: center;
    background: var(--dsg-white);
    border: 1px solid var(--dsg-border);
    border-radius: 14px;
    padding: 48px 32px;
    box-shadow: var(--dsg-shadow);
}
.dsg-download-hero .dsg-btn { margin: 8px 0 12px; }
.dsg-download-meta { color: var(--dsg-muted); font-size: 15px; margin-bottom: 24px; }
.dsg-download-size { color: var(--dsg-muted); font-size: 13px; margin-top: 8px; }
.dsg-download-content h2 { text-align: center; margin-top: 8px; }

/* ---------- 21. 页脚 ---------- */
.dsg-footer {
    background: var(--dsg-brown);
    color: rgba(250, 248, 245, 0.85);
    padding: 56px 0 24px;
    margin-top: 48px;
}

.dsg-footer-cols {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(250, 248, 245, 0.14);
    margin-bottom: 24px;
}

.dsg-footer-col h4 {
    color: #FAF8F5;
    font-size: 17px;
    letter-spacing: 1px;
    margin-bottom: 12px;
}
.dsg-footer-col p { color: rgba(250, 248, 245, 0.72); font-size: 14px; }
.dsg-footer-col a { color: rgba(250, 248, 245, 0.85); }
.dsg-footer-col a:hover { color: #FFF; }
.dsg-footer-links li { margin-bottom: 6px; font-size: 14px; }
.dsg-footer-version { color: #FAF8F5; font-weight: 600; }

.dsg-footer-copy {
    text-align: center;
    font-size: 13px;
    color: rgba(250, 248, 245, 0.55);
}
.dsg-footer-copy a { color: rgba(250, 248, 245, 0.75); }
.dsg-footer-copy p { margin-bottom: 4px; }
.dsg-footer-slogan { letter-spacing: 3px; }

/* ---------- 22. 响应式：平板 / 手机 ---------- */
@media (max-width: 992px) {
    .dsg-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .dsg-poem-grid { grid-template-columns: repeat(3, 1fr); }
    .dsg-hero-title { font-size: 44px; }
}

@media (max-width: 768px) {
    /* 导航：收起为汉堡菜单 */
    .dsg-nav-toggle { display: inline-block; }

    .dsg-nav {
        display: none;
        position: absolute;
        top: var(--dsg-header-h);
        left: 0;
        right: 0;
        background: var(--dsg-bg);
        border-bottom: 1px solid var(--dsg-border);
        box-shadow: var(--dsg-shadow-hover);
    }
    .dsg-nav.is-open { display: block; }
    .dsg-nav ul { flex-direction: column; padding: 12px 24px; }
    .dsg-nav a { padding: 12px 16px; }

    .dsg-poem-grid { grid-template-columns: repeat(2, 1fr); }
    .dsg-stats-inner { grid-template-columns: repeat(3, 1fr); }
    .dsg-footer-cols { grid-template-columns: 1fr; gap: 24px; }

    .dsg-hero-title { font-size: 36px; letter-spacing: 3px; }
    .dsg-hero { padding: 56px 0 48px; }
    .dsg-post-title { font-size: 30px; }
    .dsg-poem-body { font-size: 18px; }
    .dsg-section { padding: 44px 0; }
}

@media (max-width: 480px) {
    .dsg-grid-4, .dsg-grid-3, .dsg-poem-grid { grid-template-columns: 1fr; }
    .dsg-post-nav { grid-template-columns: 1fr; }
    .dsg-post-next { text-align: left; }
    .dsg-download-hero { padding: 32px 20px; }
    .dsg-page-content { padding: 24px 20px; }
    .dsg-tab-panel { padding: 20px; }
    .dsg-stat-num { font-size: 32px; }
}