/* ===== Reset & Base (复用首页) ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --max-width: 820px;
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
}

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

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* ===== Article Header ===== */
.article-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 100px 24px 40px;
  border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.article-header-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 6px;
  background: rgba(37,99,235,0.1);
  color: var(--color-primary);
}

/* ===== Article Body ===== */
.article-body {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 16px;
  color: var(--color-text);
}

.article-body ul,
.article-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: var(--color-text);
}

.article-body code {
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: "Fira Code", "Source Code Pro", Consolas, monospace;
  color: #e34c26;
}

.article-body pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 20px 24px;
  border-radius: 10px;
  overflow-x: auto;
  margin-bottom: 20px;
  font-size: 0.88rem;
  line-height: 1.6;
}

.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--color-bg-alt);
  border-radius: 0 8px 8px 0;
  color: var(--color-text-secondary);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}

.article-body th,
.article-body td {
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.article-body th {
  background: var(--color-bg-alt);
  font-weight: 600;
}

/* ===== Back Button ===== */
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  margin: 0 24px 40px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: var(--transition);
}

.article-back:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 32px 0;
  color: #94a3b8;
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .article-header h1 { font-size: 1.5rem; }
  .article-body pre { padding: 14px 16px; font-size: 0.82rem; }
}