/* =========================================================================
   科米主题 Komi — 主样式
   设计令牌 + 现代布局 + 暗黑模式
   ========================================================================= */

/* ---- 设计令牌 ---- */
:root {
    --komi-primary: #4f46e5;
    --komi-primary-hover: #4338ca;

    --komi-bg: #f7f8fa;
    --komi-surface: #ffffff;
    --komi-border: #e6e8eb;
    --komi-text: #1f2430;
    --komi-text-muted: #6b7280;
    --komi-shadow: 0 2px 8px rgba(17, 24, 39, .06), 0 8px 24px rgba(17, 24, 39, .04);

    --komi-radius: 14px;
    --komi-radius-sm: 8px;
    --komi-container: 1180px;
    --komi-gap: 24px;

    --komi-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
    --komi-bg: #0f1115;
    --komi-surface: #171a21;
    --komi-border: #262b35;
    --komi-text: #e6e8eb;
    --komi-text-muted: #9aa3b2;
    --komi-shadow: 0 2px 8px rgba(0, 0, 0, .4);
}

/* ---- 基础 ---- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--komi-font);
    font-size: 16px;
    line-height: 1.7;
    color: var(--komi-text);
    background: var(--komi-bg);
    -webkit-font-smoothing: antialiased;
    transition: background .25s ease, color .25s ease;
}

a { color: var(--komi-primary); text-decoration: none; }
a:hover { color: var(--komi-primary-hover); }

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

.container {
    max-width: var(--komi-container);
    margin-inline: auto;
    padding-inline: 20px;
}

.screen-reader-text {
    position: absolute !important;
    width: 1px; height: 1px;
    overflow: hidden; clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}

.skip-link {
    position: absolute; left: -999px;
    background: var(--komi-primary); color: #fff;
    padding: 8px 16px; z-index: 1000;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ---- 按钮 ---- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 6px; padding: 9px 18px; border-radius: var(--komi-radius-sm);
    font-size: 14px; font-weight: 600; cursor: pointer;
    border: 1px solid transparent; transition: all .2s ease;
}
.btn--primary { background: var(--komi-primary); color: #fff; }
.btn--primary:hover { background: var(--komi-primary-hover); color: #fff; }
.btn--ghost { background: transparent; border-color: var(--komi-border); color: var(--komi-text); }
.btn--ghost:hover { border-color: var(--komi-primary); color: var(--komi-primary); }

.icon-btn {
    background: transparent; border: 0; cursor: pointer;
    font-size: 18px; line-height: 1; padding: 8px;
    border-radius: var(--komi-radius-sm); color: var(--komi-text);
}
.icon-btn:hover { background: var(--komi-bg); }
.icon-btn--mobile { display: none; }

/* ---- 头部 ---- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: color-mix(in srgb, var(--komi-surface) 88%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--komi-border);
}
.site-header__inner {
    display: flex; align-items: center; gap: var(--komi-gap);
    height: 64px;
}
.site-title { font-size: 20px; font-weight: 800; color: var(--komi-text); }
.custom-logo { max-height: 40px; width: auto; }

.site-nav { margin-inline-start: auto; }
.site-nav__menu {
    list-style: none; display: flex; gap: 4px; margin: 0; padding: 0;
}
.site-nav__menu a {
    display: block; padding: 8px 14px; border-radius: var(--komi-radius-sm);
    color: var(--komi-text); font-weight: 500; font-size: 15px;
}
.site-nav__menu a:hover,
.site-nav__menu .current-menu-item > a {
    background: var(--komi-bg); color: var(--komi-primary);
}

.site-header__actions { display: flex; align-items: center; gap: 8px; }

.site-search-bar {
    border-top: 1px solid var(--komi-border);
    padding-block: 14px; background: var(--komi-surface);
}

/* ---- 搜索表单 ---- */
.search-form { display: flex; gap: 8px; }
.search-form__input {
    flex: 1; padding: 10px 14px; border-radius: var(--komi-radius-sm);
    border: 1px solid var(--komi-border); background: var(--komi-surface);
    color: var(--komi-text); font-size: 15px;
}
.search-form__input:focus {
    outline: none; border-color: var(--komi-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--komi-primary) 18%, transparent);
}
.search-form__submit {
    padding: 10px 20px; border: 0; border-radius: var(--komi-radius-sm);
    background: var(--komi-primary); color: #fff; font-weight: 600; cursor: pointer;
}

/* ---- 内容布局 ---- */
.site-content { padding-block: 36px; min-height: 60vh; }
.layout-with-sidebar {
    display: grid; grid-template-columns: 1fr 320px; gap: 36px; align-items: start;
}
.primary-area { min-width: 0; }

/* ---- 文章列表 ---- */
.post-list--grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--komi-gap);
}
.post-list--list { display: flex; flex-direction: column; gap: var(--komi-gap); }

.post-card {
    background: var(--komi-surface); border: 1px solid var(--komi-border);
    border-radius: var(--komi-radius); overflow: hidden;
    box-shadow: var(--komi-shadow); transition: transform .2s ease, box-shadow .2s ease;
    display: flex; flex-direction: column;
}
.post-card:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(17,24,39,.12); }

.post-list--list .post-card { flex-direction: row; }
.post-list--list .post-card__thumb { flex: 0 0 280px; }

.post-card__thumb img {
    width: 100%; aspect-ratio: 3 / 2; object-fit: cover;
}
.post-card__body { padding: 18px 20px; display: flex; flex-direction: column; gap: 10px; }
.post-card__cat {
    display: inline-block; font-size: 12px; font-weight: 600;
    color: var(--komi-primary);
    background: color-mix(in srgb, var(--komi-primary) 10%, transparent);
    padding: 3px 10px; border-radius: 999px;
}
.post-card__title { margin: 0; font-size: 18px; line-height: 1.4; }
.post-card__title a { color: var(--komi-text); }
.post-card__title a:hover { color: var(--komi-primary); }
.post-card__excerpt { margin: 0; color: var(--komi-text-muted); font-size: 14px; }
.post-card__meta {
    display: flex; gap: 14px; margin-top: auto;
    font-size: 13px; color: var(--komi-text-muted);
}

/* ---- 单篇 ---- */
.single-post {
    background: var(--komi-surface); border: 1px solid var(--komi-border);
    border-radius: var(--komi-radius); padding: 36px; box-shadow: var(--komi-shadow);
}
.single-post__title { margin: 0 0 16px; font-size: 32px; line-height: 1.3; }
.post-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--komi-text-muted); font-size: 14px; }
.single-post__thumb { margin: 24px 0; border-radius: var(--komi-radius); overflow: hidden; }
.entry-content { font-size: 16.5px; line-height: 1.85; }
.entry-content h2 { margin-top: 1.8em; font-size: 24px; }
.entry-content h3 { margin-top: 1.5em; font-size: 20px; }
.entry-content img { border-radius: var(--komi-radius-sm); margin-block: 1em; }
.entry-content pre {
    background: #1e1e2e; color: #e6e8eb; padding: 18px; border-radius: var(--komi-radius-sm);
    overflow-x: auto;
}
.entry-content blockquote {
    margin: 1.5em 0; padding: 4px 20px; border-left: 4px solid var(--komi-primary);
    color: var(--komi-text-muted);
}
.post-tags { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 8px; }
.post-tags a {
    font-size: 13px; padding: 4px 12px; border-radius: 999px;
    background: var(--komi-bg); color: var(--komi-text-muted);
}

/* ---- 侧边栏 ---- */
.sidebar { display: flex; flex-direction: column; gap: var(--komi-gap); position: sticky; top: 84px; }
.widget {
    background: var(--komi-surface); border: 1px solid var(--komi-border);
    border-radius: var(--komi-radius); padding: 20px; box-shadow: var(--komi-shadow);
}
.widget-title { margin: 0 0 14px; font-size: 16px; }

/* ---- 归档头 ---- */
.archive-header { margin-bottom: 28px; }
.archive-title { margin: 0; font-size: 28px; }

/* ---- 分页 ---- */
.pagination { margin-top: 36px; display: flex; justify-content: center; }
.pagination .nav-links { display: flex; gap: 6px; flex-wrap: wrap; }
.pagination .page-numbers {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 40px; height: 40px; padding: 0 12px;
    border: 1px solid var(--komi-border); border-radius: var(--komi-radius-sm);
    background: var(--komi-surface); color: var(--komi-text);
}
.pagination .page-numbers.current,
.pagination .page-numbers:hover { background: var(--komi-primary); color: #fff; border-color: var(--komi-primary); }

/* ---- 404 / 无结果 ---- */
.error-404 { text-align: center; padding: 80px 20px; }
.error-404__code { font-size: 96px; font-weight: 900; color: var(--komi-primary); line-height: 1; }
.error-404__title { font-size: 28px; margin: 12px 0; }
.error-404__search { max-width: 420px; margin: 24px auto; }
.no-results { background: var(--komi-surface); border: 1px solid var(--komi-border); border-radius: var(--komi-radius); padding: 48px; text-align: center; }

/* ---- 评论 ---- */
.comments-area {
    margin-top: 36px; background: var(--komi-surface); border: 1px solid var(--komi-border);
    border-radius: var(--komi-radius); padding: 28px; box-shadow: var(--komi-shadow);
}
.comment-list { list-style: none; padding: 0; }
.comment-list .children { list-style: none; padding-left: 28px; }
.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
    width: 100%; padding: 10px 14px; border: 1px solid var(--komi-border);
    border-radius: var(--komi-radius-sm); background: var(--komi-surface); color: var(--komi-text);
}

/* ---- 返回顶部 ---- */
.back-to-top {
    position: fixed; right: 24px; bottom: 24px; z-index: 90;
    width: 44px; height: 44px; border-radius: 50%; border: 0; cursor: pointer;
    background: var(--komi-primary); color: #fff; font-size: 20px;
    box-shadow: var(--komi-shadow); opacity: 0; transform: translateY(10px);
    transition: opacity .25s, transform .25s;
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0); }

/* ---- 页脚 ---- */
.site-footer {
    margin-top: 60px; border-top: 1px solid var(--komi-border);
    background: var(--komi-surface); padding-block: 32px;
}
.site-footer__inner { text-align: center; color: var(--komi-text-muted); }
.footer-nav__menu { list-style: none; display: flex; gap: 20px; justify-content: center; padding: 0; margin: 0 0 16px; }
.footer-nav__menu a { color: var(--komi-text-muted); font-size: 14px; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
    .layout-with-sidebar { grid-template-columns: 1fr; }
    .sidebar { position: static; }
}
@media (max-width: 768px) {
    .post-list--grid { grid-template-columns: 1fr; }
    .post-list--list .post-card { flex-direction: column; }
    .post-list--list .post-card__thumb { flex: none; }
    .icon-btn--mobile { display: inline-flex; }
    .single-post { padding: 22px; }
    .single-post__title { font-size: 24px; }

    /* 移动端导航抽屉 */
    .site-nav {
        position: absolute; top: 100%; left: 0; right: 0;
        background: var(--komi-surface); border-bottom: 1px solid var(--komi-border);
        box-shadow: var(--komi-shadow);
        max-height: 0; overflow: hidden; opacity: 0; visibility: hidden;
        transition: max-height .28s ease, opacity .2s ease;
        margin-inline-start: 0;
    }
    .site-nav.is-open { max-height: 70vh; opacity: 1; visibility: visible; overflow-y: auto; }
    .site-nav__menu { flex-direction: column; gap: 0; padding: 8px 12px; }
    .site-nav__menu a { padding: 12px 14px; border-radius: var(--komi-radius-sm); }
    .site-nav__menu li { border-bottom: 1px solid var(--komi-border); }
    .site-nav__menu li:last-child { border-bottom: 0; }
}
@media (min-width: 769px) {
    .icon-btn--mobile { display: none; }
}