/*! 由 ./zh/about/flag/aboutadmin.html 内联 <style> 原样提取，勿手改（保持视觉一致） */

*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#87CEEB;--primary-dark:#4682B4;--bg:#E6F7FF;--card:#FFFFFF;--text:#333;--gray:#666;--alert-bg:#003366;--gap-sm:8px;--gap-md:16px;--gap-lg:24px;--padding-sm:12px;--padding-md:20px;--padding-lg:30px;--device-shadow:0 0 20px rgba(0,0,0,0.15);--elastic-out:cubic-bezier(0.34,1.56,0.64,1);--elastic-soft:cubic-bezier(0.22,1,0.36,1);--card-shadow:0 8px 24px rgba(135,206,235,0.4)}
body::before{content:'';position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(ellipse at 20% 50%,rgba(135,206,235,0.10),transparent 60%),radial-gradient(ellipse at 80% 20%,rgba(70,130,180,0.06),transparent 50%);z-index:0;animation:bgDrift 14s ease-in-out infinite alternate;pointer-events:none}
@keyframes bgDrift{0%{transform:scale(1);opacity:0.7}100%{transform:scale(1.04);opacity:1}}
@keyframes fadeSlideUp{to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{to{opacity:1}}
@keyframes cardIn{to{opacity:1;transform:translateY(0)}}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑",sans-serif;background:#f0f4f8;color:var(--text);min-height:100vh;display:flex;flex-direction:column;position:relative;font-size:16px}
.page-wrapper{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:0 var(--padding-sm);position:relative;z-index:1}
.container{flex:1;max-width:1200px;width:100%;margin:0 auto;padding:clamp(var(--padding-md),5vw,var(--padding-lg)) var(--padding-sm);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--gap-sm)}
.navbar{background:var(--primary);padding:12px 0;box-shadow:0 2px 10px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100;width:100%;opacity:0;animation:fadeSlideUp 0.7s var(--elastic-soft) 0.1s forwards}
.nav-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:0 var(--padding-sm)}
.logo{font-size:clamp(1.2rem,4vw,1.5rem);font-weight:bold;color:var(--primary-dark);text-decoration:none;transition:transform 0.35s var(--elastic-out)}
.logo:hover{transform:scale(1.06)}
.nav-links{display:flex;gap:clamp(12px,3vw,20px)}
.nav-links a{color:var(--primary-dark);font-weight:500;text-decoration:none;font-size:clamp(0.9rem,3vw,1rem);opacity:0;transform:translateY(-6px);animation:fadeSlideUp 0.45s var(--elastic-soft) forwards;position:relative;padding-bottom:4px;transition:color 0.3s ease}
.nav-links a:nth-child(1){animation-delay:0.2s}
.nav-links a:nth-child(2){animation-delay:0.3s}
.nav-links a:nth-child(3){animation-delay:0.4s}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--primary-dark);border-radius:2px;transition:width 0.35s var(--elastic-out)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.device-switch-container{position:fixed;top:80px;right:20px;z-index:99;display:flex;flex-direction:column;gap:10px}
.switch-toggle-btn{width:50px;height:50px;border-radius:50%;background:var(--primary);color:var(--primary-dark);border:none;font-size:18px;cursor:pointer;box-shadow:var(--device-shadow);display:flex;align-items:center;justify-content:center;transition:all 0.3s var(--elastic-out)}
.switch-toggle-btn:hover{transform:scale(1.08)}
.switch-toggle-btn:active{transform:scale(0.93)}
.device-options{display:none;flex-direction:column;gap:8px;background:white;padding:10px;border-radius:10px;box-shadow:var(--device-shadow)}
.device-options.show{display:flex}
.device-btn{padding:8px 12px;border:1px solid var(--primary);border-radius:6px;background:white;color:var(--primary-dark);cursor:pointer;font-size:14px;transition:all 0.25s}
.device-btn.active,.device-btn:hover{background:var(--primary);color:white}
.back-btn{color:var(--primary-dark);text-decoration:none;font-weight:500;font-size:0.9rem;padding:6px 20px;border:1px solid var(--primary-dark);border-radius:6px;transition:all 0.35s var(--elastic-out);display:inline-flex;align-items:center;align-self:flex-start;margin-bottom:0;opacity:0;transform:translateX(-20px);animation:fadeSlideUp 0.5s var(--elastic-soft) 0.15s forwards}
.back-btn::before{content:'';display:inline-block;width:7px;height:7px;border-left:2px solid var(--primary-dark);border-bottom:2px solid var(--primary-dark);transform:rotate(45deg);margin-right:7px;flex-shrink:0;transition:border-color 0.25s}
.back-btn:hover{background:var(--primary-dark);color:white}
.back-btn:hover::before{border-color:#fff}
.card{background:var(--card);width:100%;max-width:800px;border-radius:16px;box-shadow:var(--card-shadow);padding:clamp(var(--padding-md),5vw,var(--padding-lg));margin-top:var(--gap-sm);opacity:0;transform:translateY(20px);animation:cardIn 0.6s var(--elastic-soft) 0.2s forwards;transition:box-shadow 0.4s ease,transform 0.4s ease}
.card:hover{box-shadow:0 12px 36px rgba(135,206,235,0.5);transform:translateY(-3px)}
.card h1{color:var(--primary-dark);text-align:center;margin-bottom:var(--gap-lg);font-size:clamp(1.8rem,6vw,2.5rem)}
.btn-group{display:flex;flex-direction:column;gap:var(--gap-md);width:100%}
/* == 每个选项独立选择框 == */
.social-btn{position:relative;color:var(--primary-dark);text-decoration:none;font-weight:600;font-size:1.1rem;display:flex;align-items:center;justify-content:center;gap:10px;padding:18px 20px;border:2px solid rgba(70,130,180,0.2);border-radius:14px;background:rgba(255,255,255,0.6);transition:all 0.35s var(--elastic-out);opacity:0;transform:translateY(12px);animation:cardIn 0.5s var(--elastic-out) forwards;overflow:hidden}
.social-btn::before{content:'';position:absolute;top:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,var(--primary),var(--primary-dark));opacity:0;transition:opacity 0.3s}
.social-btn:hover::before{opacity:1}
.social-btn:nth-of-type(1){animation-delay:0.3s}
.social-btn:nth-of-type(2){animation-delay:0.38s}
.social-btn:nth-of-type(3){animation-delay:0.46s}
.social-btn:nth-of-type(4){animation-delay:0.54s}
.social-btn:hover{background:var(--primary-dark);color:white;border-color:var(--primary-dark);transform:translateY(-3px) scale(1.02);box-shadow:0 8px 24px rgba(70,130,180,0.25)}
.social-btn:active{transform:translateY(0) scale(0.97);transition-duration:0.1s}
.social-btn .btn-icon{font-size:1.3rem;flex-shrink:0}
footer{text-align:center;padding:var(--padding-md);background:var(--primary);color:var(--primary-dark);font-size:clamp(0.8rem,2.5vw,0.85rem);line-height:1.5;width:100%;opacity:0;animation:fadeIn 0.8s ease 0.6s forwards}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#fff399;border-radius:4px}
::-webkit-scrollbar-track{background:#f1f1f1}
@media(max-width:768px){.device-switch-container{top:70px;right:10px}.switch-toggle-btn{width:40px;height:40px;font-size:16px}.container{gap:var(--gap-sm);align-items:flex-start;padding-left:var(--padding-md);padding-right:var(--padding-md)}.card{max-width:100%}.social-btn{padding:14px 16px;font-size:1rem}}
@media(max-width:480px){.nav-container{flex-wrap:wrap;justify-content:center;gap:var(--gap-sm)}.nav-links{margin-top:8px;justify-content:center}.device-options{right:50px}.container{align-items:flex-start}.social-btn{padding:12px 14px;font-size:0.95rem}}