* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Noto Sans SC', 'Roboto', -apple-system, sans-serif;
  font-size: 14px;
  color: #202124;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* 与 mainpic.jpg 一致的蓝灰→暖黄对角渐变 */
  background: linear-gradient(135deg, #c8d1da 0%, #d4dce4 35%, #ebe4c8 65%, #f9de6b 100%);
}
a {
  color: rgba(0, 0, 0, 0.75);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* 隐形页宽 1600px，居中，无左右边界 */
.page-width {
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 页首：贯穿整页，内层 1600px */
.site-header {
  background: #fff;
  width: 100%;
}
.header-inner {
  display: flex;
  flex-direction: column;
  padding-top: 14px;
  padding-bottom: 0;
}
.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.header-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: #c62828;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.header-sitename {
  font-size: 22px;
  font-weight: 500;
  color: #2e7d32;
  letter-spacing: 0.02em;
}
.header-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  padding: 12px 0 14px;
  border-top: 1px solid #e8e8e8;
}
.header-nav a {
  font-size: 15px;
  color: #333;
}
.header-nav a:hover {
  color: #2e7d32;
}

/* Main */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px 80px;
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}
.logo-center {
  margin-bottom: 32px;
  text-align: center;
}
.logo-center h1 {
  font-size: 72px;
  font-weight: 400;
  letter-spacing: -2px;
  color: #202124;
}
.logo-center .sub {
  font-size: 18px;
  color: #5f6368;
  margin-top: 4px;
}
.placeholder-area {
  width: 80%;
  max-width: 1280px; /* 主页面隐藏宽度 1600px 的 80% */
  aspect-ratio: 16/9;
  background: transparent;
  border: none;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}
.placeholder-area img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.placeholder-caption {
  margin-top: 16px;
  font-size: 13px;
  color: #5f6368;
}

/* 子页正文（关于/隐私/条款/联系） */
main:has(.page-content) {
  justify-content: flex-start;
  align-items: flex-start;
  padding-top: 48px;
}
.page-content {
  max-width: 720px;
}
.page-content h1 {
  font-size: 24px;
  font-weight: 500;
  margin-bottom: 20px;
  color: #202124;
}
.page-content p {
  margin-bottom: 14px;
  line-height: 1.6;
  color: #5f6368;
}

/* Footer - Google style */
footer {
  background: #f2f2f2;
  width: 100%;
}
footer .page-width {
  padding-top: 16px;
  padding-bottom: 16px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  gap: 24px;
}
.footer-links-left,
.footer-links-right {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}
footer a {
  color: #5f6368;
  font-size: 14px;
}