:root {
  --accent: #4f6ef7;
  --accent-strong: #3b56d4;
  --bg: #f6f7fa;
  --surface: #ffffff;
  --border: #e4e7ec;
  --text: #1a1d24;
  --text-dim: #5b6472;
  --radius: 14px;
  --maxw: 960px;
  --font: -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #6b85ff;
    --accent-strong: #8a9eff;
    --bg: #0f1115;
    --surface: #171a21;
    --border: #262b35;
    --text: #e7eaf0;
    --text-dim: #9aa1ab;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, #4f6ef7, #8a63ff);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
}

.nav-links {
  margin-left: auto;
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.nav-links a {
  color: var(--text-dim);
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 7px 16px;
  border-radius: 8px;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--accent-strong);
  text-decoration: none;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  padding: 72px 24px 48px;
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}

.hero .tag {
  display: inline-block;
  font-size: 13px;
  color: var(--accent);
  background: rgba(79, 110, 247, 0.1);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.28;
  margin: 0 0 16px;
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 18px;
  color: var(--text-dim);
  margin: 0 0 30px;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 13px 30px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 16px;
  margin: 0 6px;
}

.cta:hover {
  background: var(--accent-strong);
  text-decoration: none;
}

.cta.secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.section {
  padding: 44px 0;
}

.section h2 {
  font-size: 26px;
  margin: 0 0 26px;
  text-align: center;
  letter-spacing: -0.3px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.card .icon {
  font-size: 22px;
  margin-bottom: 10px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
}

.faq {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  margin-bottom: 12px;
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.faq-item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
}

.cta-band {
  text-align: center;
  padding: 56px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.cta-band h2 {
  margin-top: 0;
}

.footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding: 26px 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}

.footer a {
  color: var(--text-dim);
  margin: 0 12px;
}

/* ---------- 文章 / 博客 ---------- */
.article {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
}

.article .meta {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 24px;
}

.article h2 {
  font-size: 22px;
  margin: 34px 0 12px;
  letter-spacing: -0.2px;
}

.article h3 {
  font-size: 17px;
  margin: 26px 0 8px;
}

.article p {
  color: var(--text-dim);
  margin: 0 0 16px;
}

.article ul {
  margin: 0 0 16px;
  padding-left: 22px;
  color: var(--text-dim);
}

.article li {
  margin-bottom: 6px;
}

.article blockquote {
  border-left: 3px solid var(--accent);
  margin: 0 0 16px;
  padding: 6px 16px;
  background: rgba(79, 110, 247, 0.06);
  border-radius: 0 8px 8px 0;
  color: var(--text-dim);
}

.article .example {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-family: ui-monospace, 'SF Mono', Consolas, monospace;
  font-size: 13px;
  color: var(--text);
  margin-bottom: 16px;
  overflow-x: auto;
}

/* ---------- 对比表 ---------- */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 16px 0;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  background: var(--surface);
  font-weight: 600;
}

.compare-table td {
  color: var(--text-dim);
}

.compare-table td:first-child {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}

.note {
  background: rgba(79, 110, 247, 0.06);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-dim);
  margin: 16px 0;
}