@import url('http://833web.cdn-shanlianvpn.com.cn/fonts/noto.css');

:root { --orange: hsl(27 100% 50%); --orange-light: hsl(30 100% 95%); --muted: hsl(0 0% 45%); --border: hsl(0 0% 90%); }
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background: #fff; color: hsl(0 0% 13%); font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
.container { max-width: 1400px; margin: auto; padding: 0 2rem; }
.header { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 1.25rem; font-weight: 700; }
.nav { display: flex; align-items: center; gap: 2rem; }
.nav a { font-size: .875rem; font-weight: 500; transition: color .2s; }
.nav a:hover, .nav a.active { color: var(--orange); }
.mobile-toggle { display: none; border: 0; background: none; font-size: 1.5rem; cursor: pointer; }
.mobile-nav { display: none; padding: 1rem 2rem; border-top: 1px solid var(--border); }
.mobile-nav.open { display: block; }
.mobile-nav a { display: block; padding: .5rem 0; font-size: .875rem; font-weight: 500; }
.btn-primary, .btn-outline { display: inline-block; padding: .75rem 2rem; border-radius: 9999px; font-size: 1rem; font-weight: 500; cursor: pointer; transition: opacity .2s, background .2s; }
.btn-primary { color: #fff; border: 0; background: linear-gradient(135deg, var(--orange), hsl(35 100% 55%)); box-shadow: 0 4px 20px -4px hsla(27 100% 50% / .3); }
.btn-primary:hover { opacity: .9; }
.btn-outline { border: 1px solid var(--border); background: transparent; }
.btn-outline:hover { background: hsl(30 10% 96%); }
.hero-section { padding: 4rem 0; background: linear-gradient(135deg, hsl(30 100% 97%), #fff); }
.section { padding: 4rem 0; }
.section-alt { padding: 4rem 0; background: hsla(30 10% 96% / .3); }
h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 1.875rem; font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }
.text-center { text-align: center; }
.text-gradient { color: var(--orange); background: linear-gradient(90deg, var(--orange), hsl(35 100% 55%)); background-clip: text; -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.text-muted { color: var(--muted); }
.text-green { color: hsl(142 71% 45%); }
.text-sm { font-size: .875rem; }
.text-xs { font-size: .75rem; }
.mb-2 { margin-bottom: .5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-8 { margin-top: 2rem; }
.grid { display: grid; gap: 1.5rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.flex { display: flex; }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: .5rem; }
.gap-3 { gap: .75rem; }
.gap-4 { gap: 1rem; }
.gap-8 { gap: 2rem; }
.gap-12 { gap: 3rem; }
.card { padding: 2rem; border: 1px solid var(--border); border-radius: 1rem; background: #fff; transition: box-shadow .2s; }
.card:hover, .blog-card:hover { box-shadow: 0 10px 30px -10px rgba(0, 0, 0, .1); }
details { border: 1px solid var(--border); border-radius: .75rem; }
details summary { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem; cursor: pointer; font-size: .875rem; font-weight: 500; }
details summary::after { content: '▼'; color: var(--muted); font-size: .75rem; transition: transform .2s; }
details[open] summary::after { transform: rotate(180deg); }
details summary::-webkit-details-marker { display: none; }
.faq-body { padding: 0 1.25rem 1.25rem; color: var(--muted); font-size: .875rem; line-height: 1.8; white-space: pre-line; }
.blog-card { overflow: hidden; border: 1px solid var(--border); border-radius: 1rem; background: #fff; transition: box-shadow .2s; }
.blog-card img { width: 100%; height: 160px; object-fit: cover; }
.social-icons { display: flex; gap: .5rem; margin-top: 1rem; }
.footer { padding: 3rem 0; color: #fff; background: hsl(0 0% 13%); }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2rem; }
.footer-col h4 { margin-bottom: .75rem; font-weight: 600; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: .5rem; color: inherit; font-size: .875rem; opacity: .7; }
.footer-col li:hover { opacity: 1; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(255, 255, 255, .1); font-size: .75rem; opacity: .5; }
.lang-switch { position: relative; margin-left: .75rem; }
.lang-btn { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border: 1px solid hsl(0 0% 85%); border-radius: 20px; background: hsl(0 0% 98%); color: hsl(0 0% 25%); font: 500 .82rem sans-serif; font-family: inherit; cursor: pointer; white-space: nowrap; }
.lang-btn:hover { border-color: var(--orange); color: var(--orange); }
.lang-dropdown { display: none; position: absolute; top: calc(100% + 8px); right: 0; z-index: 200; min-width: 160px; overflow: hidden; border: 1px solid hsl(0 0% 88%); border-radius: 14px; background: #fff; box-shadow: 0 8px 30px rgba(0, 0, 0, .12); }
.lang-dropdown.show { display: block; }
.lang-dropdown a { display: flex; align-items: center; gap: 10px; padding: 10px 16px; color: hsl(0 0% 25%); font-size: .85rem; white-space: nowrap; }
.lang-dropdown a:hover, .lang-dropdown a.active { color: var(--orange); background: hsl(27 100% 97%); }
.lang-dropdown a.active::after { content: '✓'; margin-left: auto; }
.lang-flag { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; border-radius: 6px; background: hsl(30 15% 95%); font-size: .7rem; font-weight: 700; }
.fade-in, .fade-in-left, .fade-in-right, .fade-in-scale { opacity: 0; transition: opacity .7s ease-out, transform .7s ease-out; }
.fade-in { transform: translateY(30px); }
.fade-in-left { transform: translateX(-30px); }
.fade-in-right { transform: translateX(30px); }
.fade-in-scale { transform: scale(.95); }
.fade-in.visible, .fade-in-left.visible, .fade-in-right.visible, .fade-in-scale.visible { opacity: 1; transform: none; }

@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: block; }
  .container { padding: 0 1rem; }
  .hero-section, .section, .section-alt { padding: 2rem 0; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .flex-row-desktop { flex-direction: column; }
  .lang-switch { margin-left: auto; margin-right: .5rem; }
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
}
@media (min-width: 769px) { .flex-row-desktop { flex-direction: row; } }