:root {
  --bg: #f7f8fa;
  --bg-soft: #ffffff;
  --text: #1a1d24;
  --text-dim: #4a5568;
  --accent: #4a6cf7;
  --accent-hover: #3a5ae0;
  --border: #e2e6ee;
}

html[data-theme="dark"] {
  --bg: #0d0f14;
  --bg-soft: #151923;
  --text: #e8eaf0;
  --text-dim: #9aa3b2;
  --accent: #6c8cff;
  --accent-hover: #5a7bf0;
  --border: #262c3a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 780px; margin: 0 auto; padding: 0 24px; }

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s ease, transform 0.15s ease;
}
.theme-toggle:hover { border-color: var(--accent); transform: scale(1.05); }

/* Hero */
.hero {
  padding: 112px 0 72px;
  text-align: center;
}
.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.hero p {
  margin: 0 auto;
  max-width: 620px;
  color: var(--text-dim);
  font-size: 18px;
}
.cta { margin-top: 32px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }

/* 正文 */
.prose { padding: 32px 0 8px; }
.prose h2 { margin: 48px 0 12px; font-size: 24px; letter-spacing: -0.01em; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin: 0 0 16px; color: var(--text-dim); font-size: 17px; }
.prose p strong { color: var(--text); }

/* 模板库 */
.section { padding: 56px 0; }
.section h2 { margin: 0 0 28px; font-size: 26px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top;
  display: block;
  background: #000;
}
.card-body { padding: 20px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.card-body h3 { margin: 0; font-size: 19px; }
.card-body p { margin: 0; color: var(--text-dim); font-size: 15px; flex: 1; }
.meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.meta a { font-size: 14px; font-weight: 600; }
.tag {
  font-size: 12px;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 999px;
}

/* 结尾 */
.closing { padding: 40px 0 72px; text-align: center; }
.closing h2 { margin: 0 0 12px; font-size: 26px; }
.closing p { margin: 0 auto 28px; max-width: 480px; color: var(--text-dim); font-size: 17px; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}
footer p { margin: 0; }

@media (max-width: 640px) {
  .hero { padding: 88px 0 56px; }
  .grid { grid-template-columns: 1fr; }
  .prose p { font-size: 16px; }
}