/* ===== base.css — 全站共享基础样式（页面 CSS 之前加载，可被其覆盖） ===== */
:root{
  --paper:#FFFFFF;--cream:#FAFAFA;--ink:#1A1A1A;--ink-soft:#666666;
  --charcoal:#333333;--red:#D72638;--red-deep:#A81D2B;--burgundy:#7A1621;
  --thread:#D72638;--line:rgba(26,26,26,.12);--maxw:1320px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Outfit','Noto Sans SC',sans-serif;background:var(--paper);color:var(--ink);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='56' viewBox='0 0 56 56'%3E%3Cg fill='none' stroke='%231A1A1A' stroke-width='1' opacity='0.04'%3E%3Cpath d='M0 14 Q14 0 28 14 Q42 28 56 14'/%3E%3Cpath d='M0 42 Q14 28 28 42 Q42 56 56 42'/%3E%3Cpath d='M0 28 Q14 14 28 28 Q42 42 56 28'/%3E%3C/g%3E%3C/svg%3E");pointer-events:none;z-index:1}
.serif{font-family:'Fraunces','Noto Sans SC',serif;font-optical-sizing:auto}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px;position:relative;z-index:2}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}

/* 顶部公告条 */
.topbar{background:var(--ink);color:var(--paper);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;padding:9px 0;text-align:center;position:relative;z-index:50}
.topbar span{color:var(--thread)}
.topbar.bar-custom{padding:9px 16px;overflow:hidden}
.topbar.bar-custom .bar-track{display:flex;align-items:center;justify-content:center;white-space:nowrap}
.topbar.bar-custom .bar-track span{color:inherit}
.topbar.bar-custom.scrolling .bar-track{justify-content:flex-start;width:max-content;animation:topbarMarquee 24s linear infinite}
.topbar.bar-custom.scrolling .bar-track span{padding-right:72px}
@keyframes topbarMarquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* 返回顶部按钮 */
.back-top{position:fixed;right:28px;bottom:28px;z-index:90;width:48px;height:48px;border-radius:50%;border:1px solid var(--line);background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(16px);transition:all .35s cubic-bezier(.2,.8,.2,1);box-shadow:0 12px 30px -10px rgba(26,26,26,.45)}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--red-deep);border-color:var(--red-deep);transform:translateY(-3px)}

/* FAQ（GEO / 常见问题） */
.faq-section{padding:48px 0 20px}
.faq-title{font-family:'Fraunces',serif;font-weight:400;font-size:26px;letter-spacing:-.01em;margin-bottom:22px}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--paper,#fff)}
.faq-item summary{cursor:pointer;padding:16px 18px;font-weight:600;font-size:15.5px;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:20px;font-weight:300;color:var(--red-deep);flex:none;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 18px 16px;margin:0;font-size:15px;line-height:1.7;color:var(--ink-soft)}

/* 导航 */
nav{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:18px 40px;max-width:var(--maxw);margin:0 auto;gap:20px}
.logo{font-family:'Fraunces',serif;font-weight:600;font-size:25px;letter-spacing:-.01em;display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:auto;height:30px;flex:none;object-fit:contain;border-radius:4px}

.nav-center{display:flex;align-items:center;gap:32px}
.nav-links{display:flex;gap:32px;list-style:none;font-size:14px;letter-spacing:.03em}
.nav-links a{position:relative;padding:6px 0;transition:color .3s;white-space:nowrap}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1.5px;background:var(--red);transition:width .35s ease}
.nav-links a:hover{color:var(--red-deep)}
.nav-links a:hover::after{width:100%}
.nav-links a.active{color:var(--red-deep)}
.nav-links a.active::after{width:100%}
.nav-links li.active > a{color:var(--red-deep)}
.nav-links li.active > a::after{width:100%}
.nav-links li.has-dropdown{position:relative}
.nav-links .dd-arrow{display:inline-block;width:9px;height:9px;margin-left:5px;transition:transform .3s;vertical-align:middle}
.nav-links li.has-dropdown:hover .dd-arrow{transform:rotate(180deg)}
.nav-dropdown{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(-8px);background:var(--paper);border:1px solid var(--line);border-radius:4px;box-shadow:0 20px 50px -15px rgba(26,26,26,.22);min-width:210px;padding:8px;opacity:0;visibility:hidden;transition:all .3s;z-index:50}
.nav-links li.has-dropdown:hover .nav-dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.nav-dropdown a{display:flex;align-items:center;gap:12px;padding:12px 16px;font-size:14px;white-space:nowrap;border-radius:2px;transition:all .2s}
.nav-dropdown a::after{display:none}
.nav-dropdown a:hover{background:var(--cream);color:var(--red-deep)}
.nav-right{display:flex;align-items:center;gap:16px;flex-shrink:0}
.nav-cta{background:var(--ink);color:var(--paper);padding:11px 24px;border-radius:2px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;transition:background .3s,transform .3s;white-space:nowrap}
.nav-cta:hover{background:var(--red-deep);transform:translateY(-1px)}
.lang-switch{position:relative;display:flex;align-items:center;gap:6px;cursor:pointer;padding:8px 10px;border-radius:2px;transition:background .3s}
.lang-switch:hover{background:var(--cream)}
.lang-icon{width:18px;height:18px;color:var(--ink-soft)}
.lang-current{font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--ink)}
.lang-arrow{width:10px;height:10px;color:var(--ink-soft);transition:transform .3s}
.lang-switch.open .lang-arrow{transform:rotate(180deg)}
.lang-dropdown{position:absolute;top:100%;right:0;margin-top:8px;background:var(--paper);border:1px solid var(--line);border-radius:4px;box-shadow:0 20px 50px -15px rgba(26,26,26,.25);min-width:140px;overflow:hidden;opacity:0;visibility:hidden;transform:translateY(-8px);transition:all .3s;z-index:50}
.lang-switch.open .lang-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.lang-option{display:flex;align-items:center;gap:10px;padding:11px 16px;font-size:14px;color:var(--ink-soft);cursor:pointer;transition:all .2s;border-bottom:1px solid var(--line)}
.lang-option:last-child{border-bottom:none}
.lang-option:hover{background:var(--cream);color:var(--ink)}
.lang-option.active{color:var(--red-deep);font-weight:600}
.lang-flag{font-size:11px;line-height:1;font-weight:600;letter-spacing:.02em;border:1px solid currentColor;border-radius:4px;padding:2px 5px;opacity:.85}
.hamburger{display:none;flex-direction:column;justify-content:center;gap:5px;width:42px;height:42px;background:transparent;border:none;cursor:pointer;padding:10px 8px;border-radius:4px;transition:background .3s}
.hamburger:hover{background:var(--cream)}
.hamburger span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:all .35s}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-menu{position:fixed;top:0;right:-100%;width:80%;max-width:340px;height:100vh;background:var(--paper);z-index:100;box-shadow:-10px 0 40px -10px rgba(26,26,26,.2);transition:right .4s cubic-bezier(.2,.8,.2,1);display:flex;flex-direction:column;padding:70px 28px 30px;overflow-y:auto}
.mobile-menu.open{right:0}
.mobile-menu-close{position:absolute;top:20px;right:20px;width:42px;height:42px;border:none;background:transparent;font-size:24px;color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:4px}
.mobile-menu-close:hover{background:var(--cream)}
.mobile-nav-links{list-style:none;display:flex;flex-direction:column;gap:0}
.mobile-nav-links li{border-bottom:1px solid var(--line)}
.mobile-nav-links a{display:block;padding:16px 4px;font-size:18px;font-weight:500;transition:color .3s,padding-left .3s}
.mobile-nav-links a:hover{color:var(--red-deep);padding-left:12px}
.mobile-nav-links li.has-sub{border-bottom:none}
.mobile-nav-links .sub-toggle{display:flex;justify-content:space-between;align-items:center;padding:16px 4px;font-size:18px;font-weight:500;cursor:pointer;transition:color .3s;background:transparent;border:none;width:100%;font-family:inherit;text-align:left;color:var(--ink)}
.mobile-nav-links .sub-toggle .chev{transition:transform .35s;flex:none}
.mobile-nav-links .sub-toggle.open .chev{transform:rotate(180deg)}
.mobile-nav-links li.active > a{color:var(--red-deep);padding-left:12px}
.mobile-nav-links li.active .sub-toggle{color:var(--red-deep)}
.mobile-sub{max-height:0;overflow:hidden;transition:max-height .4s ease;border-bottom:1px solid var(--line)}
.mobile-sub.open{max-height:300px}
.mobile-sub a{padding:13px 20px;font-size:15px;font-weight:400;color:var(--ink-soft)}
.mobile-menu .nav-cta{margin-top:24px;text-align:center;padding:16px;font-size:15px}
.mobile-langs{display:flex;gap:10px;margin-top:30px;flex-wrap:wrap}
.mobile-langs button{padding:8px 16px;border:1px solid var(--line);border-radius:100px;background:transparent;font-size:13px;color:var(--ink-soft);cursor:pointer;font-family:inherit;transition:all .3s}
.mobile-langs button.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.menu-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:99;opacity:0;visibility:hidden;transition:all .4s}
.menu-overlay.open{opacity:1;visibility:visible}

/* 面包屑 */
.breadcrumb{padding:24px 0 0}
.crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-soft)}
.crumbs a{transition:color .3s}
.crumbs a:hover{color:var(--red-deep)}
.crumbs .sep{color:var(--line);font-size:16px}
.crumbs .current{color:var(--ink);font-weight:500}

/* 页脚 */
footer{background:var(--ink);color:var(--paper);padding:80px 0 36px;position:relative;z-index:3}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:50px;margin-bottom:60px}
.foot-brand .logo{color:var(--paper);margin-bottom:20px}
.foot-brand p{font-size:14px;color:rgba(255,255,255,.6);max-width:300px;line-height:1.6}
.foot-col h4{font-family:'Fraunces',serif;font-size:16px;font-weight:500;margin-bottom:20px;color:var(--thread)}
.foot-col ul{list-style:none;display:flex;flex-direction:column;gap:12px}
.foot-col a{font-size:14px;color:rgba(255,255,255,.7);transition:color .3s}
.foot-col a:hover{color:var(--thread)}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:30px;border-top:1px solid rgba(255,255,255,.14);font-size:13px;color:rgba(255,255,255,.5)}

/* 滚动进入动画（main.js 配合） */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s cubic-bezier(.2,.8,.2,1),transform .8s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}

/* 响应式（仅全局部分） */
@media(max-width:1024px){
  .nav-links{display:none}.lang-switch.desktop-only{display:none}.hamburger{display:flex}.nav-cta{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .wrap,.nav-inner{padding:0 20px}.nav-inner{padding:16px 20px}
  .logo{font-size:21px}.logo-mark{width:auto;height:26px}
  .topbar{font-size:10.5px;padding:8px 12px;letter-spacing:.1em}
  .back-top{right:16px;bottom:16px;width:42px;height:42px}
  .foot-grid{grid-template-columns:1fr;gap:36px}
  .foot-bottom{flex-direction:column;gap:14px;text-align:center}
}