/* ===== 平哥集录 - 水墨意境主题 ===== */

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

:root {
    --color_bg: #FBFBFA;
    --color_text: #1A1A1A;          /* 墨黑正文，白底对比最强 */
    --color_text_light: #595550;    /* 次要文字，白底上足够清晰 */
    --color_border: #ECECEC;        /* 浅灰边框，白卡分层 */
    --color_accent: #B23A2C;        /* 主题红，保留水墨点睛 */
    --color_math: #B23A2C;
    --color_literature: #4F6B45;
    --color_philosophy: #3E5666;
    --color_misc: #92683F;
}

body {
    background: var(--color_bg);
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
    color: var(--color_text);
    line-height: 1.7;
    font-size: 16px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===== 头部导航 ===== */
.header {
    border-bottom: 1px solid var(--color_border);
    padding: 1rem 0;
    position: relative;
    z-index: 100;
}

.header-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-self: start;
}

.header-right {
    display: flex;
    align-items: center;
    justify-self: end;
}

.site-name {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color_text);
    letter-spacing: .1em;
    text-decoration: none;
}

.nav {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    justify-self: center;
    justify-content: center;
}

.nav a {
    color: var(--color_text);
    text-decoration: none;
    font-size: .9375rem;
    transition: color .2s;
}

.nav a:hover {
    color: var(--color_accent);
}

.search-icon {
    background: none;
    border: 1px solid var(--color_border);
    color: var(--color_text_light);
    cursor: pointer;
    padding: .5rem;
    border-radius: 6px;
    transition: background .2s;
}

.search-icon:hover {
    background: rgba(0, 0, 0, .04);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: .25rem;
    cursor: pointer;
    padding: .5rem;
}

.hamburger span {
    width: 20px;
    height: 2px;
    background: var(--color_text);
}

/* ===== 移动端菜单 ===== */
.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    box-shadow: 0 4px 12px rgba(62, 58, 57, .12);
    padding: 1rem;
    border-top: 1px solid var(--color_border);
    z-index: 1000;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu li {
    margin-bottom: .5rem;
}

.mobile-menu a {
    color: var(--color_text);
    text-decoration: none;
    font-size: .9375rem;
}

/* ===== 搜索弹层 ===== */
.search-overlay {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    box-shadow: 0 4px 12px rgba(62, 58, 57, .12);
    padding: 1rem;
    border-top: 1px solid var(--color_border);
    z-index: 999;
}

.search-overlay.active {
    display: block;
}

.search-box {
    display: flex;
    gap: .5rem;
    max-width: 480px;
    margin: 0 auto;
}

.search-box input {
    flex: 1;
    padding: .625rem .875rem;
    border: 1px solid var(--color_border);
    border-radius: 6px;
    font-size: .9375rem;
    outline: none;
    color: var(--color_text);
}

.search-box input:focus {
    border-color: var(--color_accent);
}

.search-submit {
    padding: .625rem .875rem;
    border: 1px solid var(--color_border);
    border-radius: 6px;
    background: rgba(0, 0, 0, .02);
    color: var(--color_accent);
    cursor: pointer;
    transition: all .2s;
}

.search-submit:hover {
    background: var(--color_accent);
    color: #fff;
    border-color: var(--color_accent);
}

.search-close {
    padding: .625rem .875rem;
    border: 1px solid var(--color_border);
    border-radius: 6px;
    background: rgba(0, 0, 0, .02);
    color: var(--color_text_light);
    cursor: pointer;
    transition: all .2s;
}

.search-close:hover {
    background: rgba(0, 0, 0, .06);
}

/* ===== 主要内容区 ===== */
.main {
    padding: 2rem 0;
}

.crumb {
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: .625rem .875rem;
    margin-bottom: 1.5rem;
    font-size: .875rem;
    font-family: 'Noto Serif SC', serif;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
}

.crumb a {
    color: var(--color_accent);
    text-decoration: none;
}

.crumb span {
    color: var(--color_text);
}

.section-header {
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
}

.section-header h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color_text);
    margin: 0 0 .5rem;
    letter-spacing: .1em;
}

.section-header .section-desc {
    font-size: .875rem;
    color: var(--color_text_light);
    margin: 0 0 1rem;
    line-height: 1.5;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color_text);
    margin-bottom: 1rem;
    padding-bottom: .625rem;
    border-bottom: 1px solid rgba(0, 0, 0, .08);
}

/* ===== 卡片通用样式 ===== */
.section-grid,
.topic-grid,
.article-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.section-card,
.topic-card,
.article-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all .3s;
    position: relative;
    overflow: hidden;
    color: inherit;
}

.section-card:before,
.topic-card:before,
.article-card:before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(212, 197, 176, .15) 0%, transparent 70%);
}

.section-card:hover,
.topic-card:hover,
.article-card:hover {
    box-shadow: 0 8px 24px rgba(62, 58, 57, .12);
    transform: translateY(-3px);
}

.section-card-header,
.topic-card-header,
.article-card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.section-card-seal,
.topic-icon,
.article-icon {
    width: 65px;
    height: 65px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 0, 0, .02), rgba(0, 0, 0, .05));
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .08);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.section-card-seal svg,
.topic-icon svg,
.article-icon svg {
    width: 28px;
    height: 28px;
}

.section-card-title-area,
.topic-title-area,
.article-title-area {
    flex: 1;
}

.section-card-title,
.topic-name,
.article-name {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: .08em;
    margin-bottom: .375rem;
    color: var(--color_text);
}

.section-card-desc,
.topic-bio,
.article-bio {
    font-size: .875rem;
    color: var(--color_text_light);
    line-height: 1.5;
}

.section-card-body,
.topic-body,
.article-body {
    flex: 1;
}

.section-card-stats,
.topic-stats,
.article-stats {
    font-size: .8125rem;
    color: var(--color_text_light);
    margin-bottom: .75rem;
}

.section-card-footer,
.topic-footer,
.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.section-card-tags,
.topic-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.section-card-tag,
.topic-tag {
    font-size: .75rem;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(0, 0, 0, .04);
    border: 1px solid rgba(0, 0, 0, .06);
}

.section-card-enter,
.topic-enter,
.article-enter {
    font-size: .75rem;
    padding: .3rem .875rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 500;
    transition: all .2s;
    flex-shrink: 0;
}

/* ===== 分类颜色 ===== */
.section-card.math .section-card-seal,
.topic-card.math .topic-icon,
.article-card.math .article-icon { color: var(--color_math); }
.section-card.math .section-card-title,
.section-card.math .section-card-tag { color: var(--color_math); }
.section-card.math .section-card-enter {
    background: rgba(201, 162, 39, .1);
    color: var(--color_math);
    border: 1px solid rgba(201, 162, 39, .2);
}
.section-card.math .section-card-enter:hover {
    background: var(--color_math);
    color: #fff;
}

.section-card.literature .section-card-seal,
.topic-card.literature .topic-icon,
.article-card.literature .article-icon { color: var(--color_literature); }
.section-card.literature .section-card-title,
.section-card.literature .section-card-tag { color: var(--color_literature); }
.section-card.literature .section-card-enter {
    background: rgba(94, 114, 83, .1);
    color: var(--color_literature);
    border: 1px solid rgba(94, 114, 83, .2);
}
.section-card.literature .section-card-enter:hover {
    background: var(--color_literature);
    color: #fff;
}

.section-card.philosophy .section-card-seal,
.topic-card.philosophy .topic-icon,
.article-card.philosophy .article-icon { color: var(--color_philosophy); }
.section-card.philosophy .section-card-title,
.section-card.philosophy .section-card-tag { color: var(--color_philosophy); }
.section-card.philosophy .section-card-enter {
    background: rgba(74, 98, 116, .1);
    color: var(--color_philosophy);
    border: 1px solid rgba(74, 98, 116, .2);
}
.section-card.philosophy .section-card-enter:hover {
    background: var(--color_philosophy);
    color: #fff;
}

.section-card.misc .section-card-seal,
.topic-card.misc .topic-icon,
.article-card.misc .article-icon { color: var(--color_misc); }
.section-card.misc .section-card-title,
.section-card.misc .section-card-tag { color: var(--color_misc); }
.section-card.misc .section-card-enter {
    background: rgba(166, 124, 82, .1);
    color: var(--color_misc);
    border: 1px solid rgba(166, 124, 82, .2);
}
.section-card.misc .section-card-enter:hover {
    background: var(--color_misc);
    color: #fff;
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: .5rem;
    margin-top: 2rem;
    padding: 1rem;
    border-top: 1px solid var(--color_border);
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    font-size: .875rem;
    padding: .375rem .75rem;
    border-radius: 6px;
    text-decoration: none;
    transition: all .2s;
}

.pagination a {
    color: var(--color_accent);
    background: rgba(0, 0, 0, .02);
    border: 1px solid rgba(0, 0, 0, .06);
}

.pagination a:hover {
    background: var(--color_accent);
    color: #fff;
    border-color: var(--color_accent);
}

.pagination span.current {
    background: var(--color_accent);
    color: #fff;
    border: 1px solid var(--color_accent);
}

.pagination span.disabled {
    color: #ccc;
    cursor: not-allowed;
    background: rgba(0, 0, 0, .02);
    border: 1px solid rgba(0, 0, 0, .06);
}

/* ===== 页脚 ===== */
.footer {
    border-top: 1px solid var(--color_border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: .875rem;
    color: var(--color_text_light);
    margin-top: 2rem;
}

/* ===== 浮动按钮 ===== */
.float-tools {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .625rem;
    z-index: 500;
}

.float-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 1px solid var(--color_border);
    background: #fff;
    color: var(--color_text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(62, 58, 57, .12);
    transition: all .25s;
}

.float-btn:hover {
    background: var(--color_accent);
    color: #fff;
    border-color: var(--color_accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(201, 75, 61, .25);
}

/* ===== 暗黑模式 ===== */
body.dark-mode {
    --color_bg: #1A1817;
    --color_text: #E8E4DD;
    --color_text_light: #A09A93;
    --color_border: #2E2A28;
    --color_accent: #D9695A;
    --color_math: #D9695A;
    --color_literature: #8FA67E;
    --color_philosophy: #7A92A5;
    --color_misc: #C49A6E;
}

body.dark-mode .article-content,
body.dark-mode .article-header,
body.dark-mode .page-content,
body.dark-mode .crumb,
body.dark-mode .section-header,
body.dark-mode .kb-recent,
body.dark-mode .search-header,
body.dark-mode .result-item,
body.dark-mode .mobile-menu,
body.dark-mode .search-overlay,
body.dark-mode .float-btn {
    background: #252220;
    color: var(--color_text);
}

body.dark-mode .section-card,
body.dark-mode .topic-card,
body.dark-mode .article-card {
    background: linear-gradient(145deg, #252220 0%, #2A2725 100%);
    color: var(--color_text);
}

body.dark-mode .float-btn:hover {
    background: var(--color_accent);
    color: #fff;
}

body.dark-mode .search-box input,
body.dark-mode .search-form input,
body.dark-mode .form-input {
    background: #1A1817;
    color: var(--color_text);
    border-color: var(--color_border);
}

body.dark-mode .article-content code {
    background: #2A2725;
}

body.dark-mode .article-content-tag,
body.dark-mode .section-card-tag,
body.dark-mode .topic-tag,
body.dark-mode .article-tag {
    background: rgba(255, 255, 255, .06);
    border-color: rgba(255, 255, 255, .1);
}

/* ===== 响应式 ===== */
@media (max-width: 991px) {
    .nav {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .header-row {
        display: flex !important;
        justify-content: space-between !important;
        align-items: center !important;
        grid-template-columns: none !important;
    }

    .header-left {
        flex: 1;
        display: flex;
        align-items: center;
        gap: .75rem;
        justify-self: auto;
    }

    .header-left .site-name {
        flex: 1;
        text-align: center;
    }

    .header-right {
        flex-shrink: 0;
        justify-self: auto;
    }

    .search-box {
        max-width: 100%;
    }

    .section-grid,
    .topic-grid,
    .article-grid {
        grid-template-columns: 1fr;
    }

    .section-header h1 {
        font-size: 1.5rem;
    }

    .float-tools {
        right: 1rem;
        bottom: 1rem;
    }
    
    .float-btn {
        width: 38px;
        height: 38px;
    }
}

/* ===== 首页专属 ===== */
.catalog-section {
    text-align: center;
    margin-bottom: 2rem;
}

.catalog-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.1rem;
    color: var(--color_text_light);
    letter-spacing: .3em;
    margin-bottom: 2rem;
}

.kb-recent {
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
}

.kb-recent h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color_text);
    margin-bottom: 1rem;
    padding-bottom: .625rem;
    border-bottom: 1px solid rgba(0, 0, 0, .08);
}

.kb-recent ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.kb-recent li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .5rem 0;
    border-bottom: 1px dashed rgba(0, 0, 0, .06);
}

.kb-recent li:last-child {
    border-bottom: none;
}

.kb-recent li a {
    color: var(--color_text);
    text-decoration: none;
    font-size: .9375rem;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 1rem;
}

.kb-recent li a:hover {
    color: var(--color_accent);
}

.kb-recent li .kb-date {
    font-size: .8125rem;
    color: var(--color_text_light);
    white-space: nowrap;
}

/* ===== 搜索页专属 ===== */
.search-header {
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
}

.search-header h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color_text);
    margin: 0 0 1rem;
}

.search-form {
    display: flex;
    gap: .5rem;
}

.search-form input {
    flex: 1;
    padding: .625rem .875rem;
    border: 1px solid var(--color_border);
    border-radius: 6px;
    font-size: .9375rem;
    outline: none;
    color: var(--color_text);
}

.search-form input:focus {
    border-color: var(--color_accent);
}

.search-form button {
    padding: .625rem 1.25rem;
    border: 1px solid var(--color_border);
    border-radius: 6px;
    background: rgba(0, 0, 0, .02);
    color: var(--color_accent);
    cursor: pointer;
    transition: all .2s;
}

.search-form button:hover {
    background: var(--color_accent);
    color: #fff;
    border-color: var(--color_accent);
}

.search-results {
    margin-bottom: 2rem;
}

.result-item {
    background: #fff;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .04);
}

.result-item h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color_text);
    margin: 0 0 .5rem;
}

.result-item h3 a {
    color: inherit;
    text-decoration: none;
}

.result-item h3 a:hover {
    color: var(--color_accent);
}

.result-item .result-meta {
    font-size: .8125rem;
    color: var(--color_text_light);
    margin-bottom: .5rem;
}

.result-item .result-meta a {
    color: var(--color_text_light);
    text-decoration: none;
}

.result-item .result-meta a:hover {
    text-decoration: underline;
}

.result-item .result-excerpt {
    font-size: .875rem;
    color: var(--color_text_light);
    line-height: 1.6;
}

.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--color_text_light);
}

/* ===== 文章详情页专属 ===== */
.article .container {
    max-width: 720px;
}

.article-header {
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
}

.article-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color_text);
    margin: 0 0 1rem;
    letter-spacing: .05em;
    line-height: 1.4;
}

.article-meta {
    font-size: .875rem;
    color: var(--color_text_light);
    margin-bottom: 1rem;
}

.article-meta span {
    margin-right: 1rem;
}

.article-meta a {
    color: var(--color_accent);
    text-decoration: none;
}



.article-content {
    background: #fff;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
    line-height: 1.95;
    color: var(--color_text);
    font-size: 1.0625rem;
    font-weight: 400;
}

.article-content h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: var(--color_text);
}

.article-content h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.375rem;
    margin: 1.5rem 0 1rem;
    color: var(--color_text);
    border-bottom: 1px solid var(--color_border);
    padding-bottom: .5rem;
}

.article-content h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.25rem;
    margin: 1.25rem 0 .75rem;
    color: var(--color_text);
}

.article-content p {
    margin-bottom: 1rem;
    text-indent: 2em;
}

.article-content ul,
.article-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.article-content li {
    margin-bottom: .5rem;
}

.article-content code {
    background: #f5f5f5;
    padding: .25rem .5rem;
    border-radius: 4px;
    font-size: .875rem;
    font-family: monospace;
    color: var(--color_accent);
}

.article-content pre {
    background: #2d2d2d;
    color: #ccc;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.article-content blockquote {
    border-left: 4px solid var(--color_accent);
    padding-left: 1rem;
    color: var(--color_text_light);
    margin-bottom: 1rem;
    background: rgba(0, 0, 0, .02);
    padding: .75rem 1rem;
    border-radius: 0 4px 4px 0;
}

.article-content a {
    color: var(--color_accent);
    text-decoration: none;
}

.article-content a:hover {
    text-decoration: underline;
}

.article-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 1rem 0;
}

.article-content hr {
    border: 1px solid var(--color_border);
    border-top: 1px dashed var(--color_border);
    margin: 2rem 0;
}

@media (max-width: 991px) {
    .article-title {
        font-size: 1.5rem;
    }
}

/* ===== 独立页面 ===== */
.page-content {
    background: #FFFFFF;
    border: 1px solid var(--color_border);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(62, 58, 57, .06);
}

.page-content .page-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color_text);
    margin: 0 0 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color_border);
}

.page-body {
    font-size: 1rem;
    line-height: 1.95;
    color: var(--color_text);
}

.page-body p {
    margin-bottom: 1rem;
    text-indent: 2em;
}

.page-body a {
    color: var(--color_accent);
    text-decoration: none;
}

.page-body a:hover {
    text-decoration: underline;
}

.page-body strong {
    font-weight: 600;
}

@media (max-width: 991px) {
    .page-content {
        padding: 1.25rem;
    }
    
    .page-content .page-title {
        font-size: 1.25rem;
    }
}