/* prevents nav bar stuttering when scrollbar appears */
html {
  scrollbar-gutter: stable;
}

/* -------- 基础样式重置 -------- */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  color: #1f2937; /* text-gray-800 */
  background: #ffffff;
}

a {
  color: inherit;
  text-decoration: none;
}

/* -------- 整体布局 -------- */

main {
  max-width: 1024px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* -------- 导航栏 -------- */

header {
  border-bottom: 1px solid #e5e7eb;
  background: #ffffff;
}

/* 导航栏整体 */
.nav {
  max-width: 1024px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #e5e7eb;
}

/* 左侧公司名 */
.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  margin-right: 2rem;
}

/* 右侧：导航 + 语言切换 */
.nav-right {
  margin-left: auto;            /* 把右侧整体挤到右边 */
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* 导航链接 */
.nav-right > a {
  padding: 0.3rem 0.5rem;
  border-bottom: 2px solid transparent;
  font-weight: 500;
}

.nav-right > a:hover {
  border-bottom-color: #2563eb;
  color: #2563eb;
}

/* 语言切换区域 */
.nav-lang {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-lang a {
  font-size: 0.85rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid #d1d5db;
  border-radius: 6px;
}

.nav-lang a:hover {
  border-color: #2563eb;
  color: #2563eb;
}

/* -------- Hero 区块 -------- */

.hero {
  padding: 3rem 0 2rem;
  text-align: center;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero p {
  max-width: 700px;
  margin: 0.5rem auto 1.5rem;
  font-size: 1.1rem;
  color: #4b5563;
}

/* Hero 按钮 */

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  margin: 0.3rem;
  font-weight: 600;
}

.btn.primary {
  background: #2563eb;
  color: white;
}

.btn.primary:hover {
  background: #1e4ed8;
}

.btn.secondary {
  background: #e5e7eb;
  color: #111827;
}

.btn.secondary:hover {
  background: #d1d5db;
}

/* -------- Section 标题 -------- */

section h1,
section h2 {
  font-size: 1.7rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

section p {
  margin: 0.5rem 0 1rem;
}

/* -------- 卡片网格 -------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-top: 1rem;
}

.card {
  padding: 1.2rem;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #ffffff;
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.07);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
  color: #111827;
}

.card p {
  color: #4b5563;
  font-size: 0.95rem;
}

/* -------- 列表 -------- */

ul {
  margin: 0.5rem 0 1rem 1.2rem;
}

ul li {
  margin-bottom: 0.5rem;
}

/* -------- 页脚 -------- */

footer {
  border-top: 1px solid #e5e7eb;
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: #6b7280;
  margin-top: 3rem;
}