/* Lato: 仅保留页面实际使用的 latin 子集,regular 400 与 bold 700 */
@font-face {
  font-family: 'Lato';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(../font/S6uyw4BMUTPHjx4wXg.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Lato';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(../font/S6u9w4BMUTPHh6UVSwiPGQ.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --brand-blue: rgb(30, 108, 147);
  --link-blue: #0000ff;
  --accent-magenta: #ff00ff;
  --text: rgb(33, 33, 33);
  --header-border: #dadce0;
  --font-sans: Lato, system-ui, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: #fff;
  line-height: 1.5;
}

img { display: block; max-width: 100%; height: auto; }

/* 移动优先:默认样式对应 <480px 小屏, 宽屏用媒体查询增量放大 */

/* 顶部站点标题栏: 白底 + 小 logo + 标题文字, 横向排列, 滚动时吸顶 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 8px 14px;
  border-bottom: 1px solid var(--header-border);
  background: #fff;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: inherit;
}

.site-logo {
  height: 32px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.site-title {
  font-size: 15pt;
  font-weight: 400;
  color: var(--text);
}

/* 底部页脚: 版权 + 隐私政策/服务条款链接 */
.site-footer {
  padding: 20px 14px;
  border-top: 1px solid var(--header-border);
  color: #666;
  font-size: 11pt;
  text-align: center;
}

.site-footer a {
  color: #666;
  text-decoration: none;
  margin: 0 6px;
}

.site-footer a:hover {
  color: var(--brand-blue);
  text-decoration: underline;
}

.site-footer .copy {
  margin: 0 6px;
}

/* 文档页(隐私政策/服务条款): 左对齐可读排版 */
.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 16px 40px;
  text-align: left;
}

.doc h1 {
  margin: 0 0 6px;
  font-size: 20pt;
  color: var(--text);
}

.doc-meta {
  margin: 0 0 20px;
  color: #666;
  font-size: 11pt;
}

.doc section { margin-bottom: 18px; }

.doc h2 {
  margin: 20px 0 6px;
  font-size: 14pt;
  color: var(--text);
}

.doc p,
.doc ul {
  margin: 6px 0;
  font-size: 11pt;
  line-height: 1.6;
}

.doc ul { padding-left: 22px; }

.doc ul li { margin: 4px 0; }

.doc a {
  color: var(--brand-blue);
  text-decoration: none;
}

.doc a:hover { text-decoration: underline; }

/* 正文居中列 */
.offer {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 12px 40px;
  text-align: center;
}

.offer-headline {
  margin: 0 0 24px;
  font-family: Arial, var(--font-sans);
  font-weight: 700;
  color: var(--link-blue);
  font-size: 20pt;
  line-height: 1.3;
  word-break: break-word;
}

.offer-img,
.offer-cta img {
  margin: 12px auto;
  max-width: 600px;
  width: 100%;
  height: auto;
}

.offer-cta {
  display: block;
  margin: 12px auto;
  text-align: center;
  text-decoration: none;
}

.offer-steps {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  font-size: 13pt;
}

.offer-steps li {
  margin: 6px 0;
  padding: 0 8px;
  word-break: break-word;
}

.offer-step-1 { color: var(--brand-blue); font-weight: 700; }
.offer-step-2 { color: var(--text); font-weight: 400; }
.offer-step-3 { color: var(--accent-magenta); font-weight: 700; }

/* ≥480px (大手机/小平板):标题、主标、内边距放大到原设计档位 */
@media (min-width: 480px) {
  .site-header { padding: 10px 20px; }
  .site-brand { gap: 10px; }
  .site-logo { height: 40px; }
  .site-title { font-size: 18pt; }
  .offer { padding: 40px 16px 56px; }
  .offer-headline { font-size: 27pt; margin-bottom: 32px; }
  .offer-img,
  .offer-cta img { margin: 16px auto; }
  .offer-cta { margin: 16px auto; }
  .offer-steps { font-size: 14pt; margin: 28px 0; }
  .doc { padding: 48px 20px 64px; }
  .doc h1 { font-size: 26pt; }
  .doc h2 { font-size: 16pt; }
  .doc p,
  .doc ul { font-size: 12pt; }
  .site-footer { font-size: 12pt; padding: 24px 20px; }
}

/* ≥768px (平板/桌面):主标最大档位 */
@media (min-width: 768px) {
  .offer-headline { font-size: 30pt; }
}