:root {
  --bg: #ffffff;
  --text: #1F3D36;
  --muted: #61726d;
  --line: #e7ecea;
  --soft: #f5f8f7;
  --soft-2: #f0f6f2;
  --accent: #A3FF3F;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

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

/* ✅ 全局左右留白增强 */
.container {
  width: min(var(--max), calc(100% - 64px));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.96);
}

/* ✅ 核心修复：header不贴边 */
.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0 24px;
}

/* ✅ 品牌微调 */
.brand-wrap {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 4px;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.menu {
  margin-left: auto;
  display: flex;
  gap: 28px;
  font-size: 15px;
}

.hero {
  padding: 58px 0 54px;
  background: var(--soft);
}

.hero-wrap {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 54px;
  align-items: center;
}

.hero-logo {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #ffffff;
  border: 1px solid #eef2f0;
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-logo img {
  width: 72%;
  height: auto;
  display: block;
  object-fit: contain;
}

.hero-text {
  min-width: 0;
}

.tag {
  display: inline-block;
  margin: 0 0 16px;
  padding: 8px 14px;
  border-radius: 999px;
  background: #dff5df;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(44px, 6vw, 74px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.subtitle {
  margin: 0 0 18px;
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
}

.description,
.section-desc,
.card p,
.site-footer p {
  font-size: 18px;
  line-height: 1.9;
  color: var(--muted);
}

.section {
  padding: 58px 0;
}

.section.alt {
  background: var(--soft-2);
}

.section h2,
.site-footer h3 {
  margin: 0 0 18px;
  font-size: 30px;
  line-height: 1.2;
  color: var(--text);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
}

.card h3 {
  margin: 0 0 12px;
  font-size: 22px;
  color: var(--text);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0 48px;
  background: #fff;
}

.record {
  margin-top: 16px;
  font-size: 14px;
  color: #87958f;
}

@media (max-width: 900px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 24px;
  }

  .menu {
    margin-left: 0;
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero-wrap {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-logo {
    max-width: 320px;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 42px 0 40px;
  }

  .subtitle {
    font-size: 22px;
  }
}