/* ============================================================
   shared.css — 深夜论文工厂 全站共用样式
   对标 mmguo.dev 极简风格：白底、纯文字、无卡片、单栏居中
   ============================================================ */

/* --- 字体引入 --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500&family=JetBrains+Mono:wght@300;400;500&family=Space+Grotesk:wght@400;500;600&display=swap');

/* --- CSS 变量 --- */
:root {
  --text: #111;
  --text-secondary: #444;
  --text-muted: #666;
  --line: #e0e0e0;
  --accent: #1a5276;
  --bg: #fafaf9;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Space Grotesk", sans-serif;
}

/* --- 全局重置 --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

::selection {
  background: #111;
  color: #fafaf9;
}

/* --- Body --- */
body {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.85;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

/* --- 主容器 --- */
.page {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 60px 24px 40px;
}

/* --- 标题 --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--text);
}

h1 {
  font-size: clamp(26px, 4vw, 34px);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

h2 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 40px 0 16px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

h3 {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin: 24px 0 8px;
  color: var(--text-secondary);
}

h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.04em;
  margin: 20px 0 8px;
}

/* --- 段落 --- */
p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* --- 链接 --- */
a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.2s, color 0.2s;
}

a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- 返回链接 --- */
.back-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.back-link:hover {
  color: var(--text);
  border-color: var(--text);
}

/* --- 列表 --- */
ul, ol {
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 2;
}

/* --- 表格 --- */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 12px 0;
}

th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text);
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  letter-spacing: 0.05em;
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  vertical-align: top;
}

/* --- Footer --- */
.site-footer {
  width: 100%;
  max-width: 680px;
  margin: 60px auto 0;
  padding: 24px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  line-height: 2;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px dashed;
}

.site-footer a:hover {
  color: var(--text);
}

/* --- 响应式 --- */
@media (max-width: 640px) {
  .page {
    padding: 32px 20px 28px;
  }
}