/* Coding Balance 官网样式 */
:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1c2333;
  --muted: #6b7280;
  --accent: #2f7cf6;
  --accent-2: #1f6feb;
  --ring: #eef1f6;
  --border: #e4e8ef;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 860px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  background: var(--ring);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}
img { max-width: 100%; display: block; }

/* 顶栏 */
.topbar { position: sticky; top: 0; z-index: 50; background: rgba(247,248,250,.9); backdrop-filter: saturate(180%) blur(12px); border-bottom: 1px solid var(--border); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-logo { display: block; }
.nav { display: flex; gap: 22px; align-items: center; }
.nav a { color: var(--muted); font-size: 14px; }
.nav a:hover { color: var(--text); text-decoration: none; }

/* 按钮 */
.btn { display: inline-block; padding: 11px 22px; border-radius: 10px; font-size: 15px; font-weight: 600; transition: .18s; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); text-decoration: none; }
.btn-ghost { border: 1px solid var(--border); color: var(--text); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* Hero */
.hero { padding: 84px 0 60px; text-align: center; }
.hero-eyebrow { display: inline-block; font-size: 13px; color: var(--accent); background: #e8f0fe; padding: 5px 14px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: 46px; line-height: 1.25; letter-spacing: -0.5px; }
.hero-sub { max-width: 620px; margin: 20px auto 0; color: var(--muted); font-size: 17px; }
.hero-actions { margin-top: 30px; display: flex; gap: 14px; justify-content: center; }
.hero-meta { margin-top: 14px; font-size: 13px; color: var(--muted); }
.hero-shot { margin-top: 44px; }
.hero-shot img { border-radius: 10px; margin: 0 auto; box-shadow: 0 8px 30px rgba(28,35,51,.12); }
.shot-caption { display: block; margin-top: 10px; font-size: 13px; color: var(--muted); }

/* 区块 */
section { padding: 64px 0; }
.section-title { font-size: 28px; text-align: center; margin-bottom: 36px; }

/* 功能卡片 */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.card-icon { font-size: 26px; }
.card h3 { margin: 12px 0 8px; font-size: 17px; }
.card p { color: var(--muted); font-size: 14px; }

/* 截图 */
.shots { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.shot-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 22px; align-items: start; }
.shot-grid figure img { border-radius: var(--radius); border: 1px solid var(--border); box-shadow: 0 6px 24px rgba(28,35,51,.08); }
.shot-grid figcaption { text-align: center; font-size: 13px; color: var(--muted); margin-top: 10px; }

/* 下载步骤 */
.steps { display: flex; flex-direction: column; gap: 20px; }
.step { display: flex; gap: 16px; }
.step-num { flex: 0 0 34px; height: 34px; border-radius: 50%; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; }
.step h3 { font-size: 16px; margin-bottom: 4px; }
.step p { color: var(--muted); font-size: 14px; }
.note { margin-top: 22px; background: #fff7e6; border: 1px solid #ffe0a3; border-radius: 12px; padding: 14px 18px; font-size: 14px; color: #8a5a00; }

/* 使用说明 */
.usage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.usage-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; font-size: 14px; }
.usage-card h3 { margin-bottom: 12px; font-size: 16px; }
.usage-card ol, .usage-card ul { padding-left: 18px; color: var(--muted); }
.usage-card li { margin-bottom: 8px; }
.usage-card li strong { color: var(--text); }

/* 更新历史 */
.changelog { background: #fff; border-top: 1px solid var(--border); }
.release { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.release-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.release-tag { background: var(--accent); color: #fff; font-weight: 700; padding: 3px 12px; border-radius: 999px; font-size: 14px; }
.release-date { color: var(--muted); font-size: 13px; }
.release ul { padding-left: 20px; color: var(--text); }
.release li { margin-bottom: 6px; }
.release-more { margin-top: 14px; font-size: 13px; color: var(--muted); }

/* 页脚 */
.footer { padding: 40px 0; text-align: center; color: var(--muted); font-size: 13px; }
.footer-note { margin-top: 6px; opacity: .8; }

/* 响应式 */
@media (max-width: 860px) {
  .nav { display: none; }
  .hero h1 { font-size: 32px; }
  .grid, .usage-grid, .shot-grid { grid-template-columns: 1fr; }
}