/* ============================================================
   psi.js.cn 全站样式表（纯 CSS，无 JavaScript）
   - 响应式：PC / 平板 / 手机
   - 左侧栏 + 内容区两栏布局
   - :target 纯 CSS 分页
   ============================================================ */

:root {
  --primary: #059669;
  --primary-dark: #047857;
  --accent: #10b981;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08);
  --wrap: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: clamp(15px, 1vw + 10px, 17px);
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
}

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

img { max-width: 100%; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 clamp(14px, 3vw, 24px); }

/* ---------------- 页眉 ---------------- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  min-height: 60px;
  gap: 0 16px;
}
.logo {
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  color: var(--text);
  padding: 8px 0;
}
.logo span { color: var(--primary); }
.logo:hover { color: var(--text); }

/* 纯 CSS 汉堡菜单（checkbox hack） */
.nav-toggle { display: none; }
.nav-burger { display: none; cursor: pointer; padding: 10px; }
.nav-burger span,
.nav-burger span::before,
.nav-burger span::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  content: "";
  transition: transform .25s;
}
.nav-burger span::before { transform: translateY(-7px); }
.nav-burger span::after  { transform: translateY(5px); }

.site-nav { display: flex; flex-wrap: wrap; }
.site-nav a {
  padding: 18px 14px;
  color: var(--text);
  font-weight: 500;
}
.site-nav a:hover { color: var(--primary); }

@media (max-width: 768px) {
  .nav-burger { display: block; }
  .site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    border-top: 1px solid var(--border);
  }
  .site-nav a { padding: 12px 4px; border-bottom: 1px solid var(--border); }
  .nav-toggle:checked ~ .site-nav { display: flex; }
  .nav-toggle:checked ~ .nav-burger span { transform: rotate(45deg) translateY(-1px); }
  .nav-toggle:checked ~ .nav-burger span::before { transform: rotate(90deg); }
  .nav-toggle:checked ~ .nav-burger span::after { display: none; }
}

/* ---------------- 主页 Hero ---------------- */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  text-align: center;
  padding: clamp(48px, 9vw, 110px) 20px;
}
.hero h1 { font-size: clamp(28px, 4.5vw, 52px); margin-bottom: 14px; }
.hero p { font-size: clamp(15px, 1.6vw, 20px); opacity: .92; max-width: 680px; margin: 0 auto 28px; }
.btn {
  display: inline-block;
  background: #fff;
  color: var(--primary);
  font-weight: 600;
  padding: 12px 32px;
  border-radius: 999px;
  transition: transform .2s;
}
.btn:hover { transform: translateY(-2px); color: var(--primary-dark); }
.btn-ghost { background: rgba(255,255,255,.16); color: #fff; margin-left: 12px; }
.btn-ghost:hover { color: #fff; }

/* ---------------- 主页分块 ---------------- */
.block { padding: clamp(36px, 6vw, 64px) 0; }
.block-title {
  font-size: clamp(22px, 2.6vw, 30px);
  text-align: center;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.block-title small { display: block; font-size: .55em; color: var(--text-light); font-weight: 400; margin-top: 6px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(14px, 2vw, 22px);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(16px, 2.4vw, 26px);
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
  display: block;
  color: var(--text);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(15,23,42,.12); color: var(--text); }
.card h3 { font-size: 1.1em; margin-bottom: 8px; color: var(--primary); }
.card p { color: var(--text-light); font-size: .92em; }
.card .meta { display: block; margin-top: 12px; font-size: .82em; color: #94a3b8; }

/* ---------------- 文章页 / 列表页布局：左侧栏 + 内容 ---------------- */
.layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: clamp(16px, 2.5vw, 28px);
  padding: clamp(18px, 3vw, 32px) 0;
  align-items: start;
}

.sidebar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  position: sticky;
  top: 76px;
}
.sidebar h3 {
  font-size: .95em;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin: 18px 0 8px;
}
.sidebar h3:first-child { margin-top: 0; }
.sidebar ul { list-style: none; }
.sidebar li a {
  display: block;
  padding: 7px 10px;
  border-radius: 6px;
  color: var(--text);
  font-size: .93em;
}
.sidebar li a:hover, .sidebar li a.active { background: #ecfdf5; color: var(--primary); }

.content { min-width: 0; }

/* ---------------- 文章正文 ---------------- */
.article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(20px, 3.5vw, 42px);
}
.article h1 { font-size: clamp(24px, 3vw, 34px); line-height: 1.35; margin-bottom: 10px; }
.article .article-meta { color: #94a3b8; font-size: .88em; margin-bottom: 26px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.article h2 { font-size: 1.4em; margin: 32px 0 12px; padding-left: 10px; border-left: 4px solid var(--primary); }
.article h3 { font-size: 1.15em; margin: 24px 0 10px; }
.article p { margin: 12px 0; }
.article ul, .article ol { margin: 12px 0 12px 24px; }
.article pre {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  font-size: .88em;
  line-height: 1.6;
  margin: 16px 0;
}
.article code { font-family: ui-monospace, Consolas, monospace; }
.article p code, .article li code { background: #eef2f7; padding: 2px 6px; border-radius: 4px; font-size: .9em; }
.article blockquote {
  border-left: 4px solid var(--accent);
  background: #ecfdf5;
  padding: 12px 16px;
  margin: 16px 0;
  border-radius: 0 8px 8px 0;
  color: #475569;
}
.article table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: .92em; }
.article th, .article td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.article th { background: #f1f5f9; }

/* 文章底部导航 */
.article-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.article-nav a {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: .92em;
}

/* ---------------- 列表页 :target 分页 ----------------
   结构：#page-1 ~ #page-N 依次排列，页码为锚点链接。
   加新文章：插入 #page-1 顶部；满了再把最旧的挪进新组并加一个 <a>。 */
.page-group { display: none; }
.page-group:target { display: grid; }
#page-1 { display: grid; }
.page-group:target ~ #page-1 { display: none; }

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: clamp(24px, 4vw, 40px) 0;
  flex-wrap: wrap;
}
.pagination a {
  min-width: 40px;
  text-align: center;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-weight: 500;
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
/* 选中态：目标页的页码高亮 */
#page-1:target ~ .pagination a[href="#page-1"],
#page-2:target ~ .pagination a[href="#page-2"],
#page-3:target ~ .pagination a[href="#page-3"],
#page-4:target ~ .pagination a[href="#page-4"],
#page-5:target ~ .pagination a[href="#page-5"],
#page-6:target ~ .pagination a[href="#page-6"],
#page-7:target ~ .pagination a[href="#page-7"],
#page-8:target ~ .pagination a[href="#page-8"],
#page-9:target ~ .pagination a[href="#page-9"],
#page-10:target ~ .pagination a[href="#page-10"],
#page-11:target ~ .pagination a[href="#page-11"],
#page-12:target ~ .pagination a[href="#page-12"] {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* 列表页顶部说明条 */
.list-head {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 18px;
}
.list-head h1 { font-size: clamp(20px, 2.4vw, 26px); }
.list-head p { color: var(--text-light); font-size: .92em; margin-top: 4px; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  margin-top: clamp(30px, 5vw, 60px);
  padding: clamp(28px, 4vw, 48px) 0 24px;
  font-size: .9em;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid #1e293b;
}
.site-footer h4 { color: #e2e8f0; margin-bottom: 10px; font-size: 1em; }
.site-footer ul { list-style: none; }
.site-footer li { margin: 6px 0; }
.site-footer a { color: #94a3b8; }
.site-footer a:hover { color: #fff; }
.copyright { text-align: center; padding-top: 18px; font-size: .88em; }

/* ---------------- 响应式断点 ---------------- */
/* 平板：侧栏移到内容上方 */
@media (max-width: 1024px) and (min-width: 769px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 8px 24px;
  }
}
/* 手机：单列 */
@media (max-width: 768px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: static; }
  .grid { grid-template-columns: 1fr; }
}