/* ============================================================
   宇森官网 · 公共样式（所有子页面共享）
   common.css — 含：CSS 变量 / 重置 / 背景 / 顶栏导航 / 用户框 / 动画 / 滚动条隐藏
   ============================================================ */

:root{
  --bg-0:#080c1a; --bg-1:#0e1730; --bg-2:#15213f;
  --violet:#8b5cf6; --magenta:#c77dff; --cyan:#4cc9f0; --gold:#e7b85c;
  --text:#e9edf6; --text-dim:#9aa6c4;
  --card:rgba(255,255,255,.045); --card-bd:rgba(255,255,255,.10);
  --glow:0 0 22px rgba(139,92,246,.28);
}

*{box-sizing:border-box;margin:0;padding:0;}

html,body{height:100%;width:100%;}
body{
  font-family:"Noto Sans SC",system-ui,sans-serif;color:var(--text);
  background:
    radial-gradient(1000px 620px at 82% -8%, rgba(139,92,246,.14), transparent 60%),
    radial-gradient(820px 560px at 8% 112%, rgba(76,201,240,.10), transparent 55%),
    linear-gradient(160deg, var(--bg-0) 0%, var(--bg-1) 48%, var(--bg-2) 100%);
  position:relative;
}

body::before,body::after{content:"";position:fixed;border-radius:50%;filter:blur(80px);z-index:0;pointer-events:none;}
body::before{width:380px;height:380px;background:rgba(139,92,246,.20);top:-110px;right:-70px;animation:fl1 20s ease-in-out infinite;}
body::after{width:340px;height:340px;background:rgba(76,201,240,.12);bottom:-110px;left:-60px;animation:fl2 24s ease-in-out infinite;}
@keyframes fl1{0%,100%{transform:translate(0,0)}50%{transform:translate(-36px,36px)}}
@keyframes fl2{0%,100%{transform:translate(0,0)}50%{transform:translate(36px,-28px)}}

/* ===== 应用容器 ===== */
.app{position:relative;z-index:2;height:100vh;display:flex;flex-direction:column;}

/* ===== 顶部导航栏 ===== */
.topbar{height:64px;flex:0 0 auto;display:flex;align-items:center;gap:22px;padding:0 30px;border-bottom:1px solid var(--card-bd);background:rgba(8,12,26,.55);backdrop-filter:blur(10px);}
.logo{display:flex;align-items:baseline;gap:9px;cursor:pointer;text-decoration:none;}
.logo .cn{font-family:"ZCOOL QingKe HuangYou",sans-serif;font-size:28px;letter-spacing:4px;color:#fff;text-shadow:0 0 16px rgba(139,92,246,.55);}
.logo .en{font-family:"Press Start 2P",monospace;font-size:9px;color:var(--magenta);letter-spacing:1px;}
.nav{display:flex;gap:6px;margin-left:12px;}
.nav a{font-family:"Noto Sans SC",sans-serif;font-size:15px;font-weight:500;color:var(--text-dim);background:transparent;border:1px solid transparent;padding:8px 15px;border-radius:10px;cursor:pointer;transition:.22s;text-decoration:none;display:inline-block;}
.nav a:hover{color:var(--text);background:rgba(139,92,246,.12);}
.nav a.active{color:#fff;background:rgba(139,92,246,.22);border-color:var(--card-bd);box-shadow:var(--glow);}
.spacer{flex:1;}

/* ===== 用户信息框 ===== */
.user-box{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text);}
.user-box .ub-name{color:#fff;font-weight:500;}
.user-box .ub-logout{font-family:inherit;font-size:12px;color:var(--text-dim);background:rgba(255,255,255,.06);border:1px solid var(--card-bd);padding:5px 12px;border-radius:8px;cursor:pointer;transition:.2s;}
.user-box .ub-logout:hover{color:#fff;background:rgba(139,92,246,.18);}
.user-box .auth-link{color:var(--text-dim);text-decoration:none;font-size:14px;transition:.2s;padding:5px 8px;}
.user-box .auth-link:hover{color:#fff;}
.user-box .auth-btn{font-family:inherit;font-size:13px;color:#0b1020;background:linear-gradient(120deg,var(--gold),#f0d49a);border:none;padding:6px 16px;border-radius:20px;cursor:pointer;font-weight:600;transition:.2s;text-decoration:none;display:inline-block;}
.user-box .auth-btn:hover{filter:brightness(1.1);box-shadow:0 0 16px rgba(231,184,92,.4);}

/* 登录专属链接 */
.nav .auth-only{display:none;}
.nav .auth-only.visible{display:inline-block;}

/* ===== 页面内容区 ===== */
.page-content{flex:1;min-height:0;overflow-y:auto;padding-right:8px;}
.page-content::-webkit-scrollbar{display:none;width:0;height:0;}
.page-content{scrollbar-width:none;-ms-overflow-style:none;}

/* ===== 通用滚动条隐藏 ===== */
.hide-scroll::-webkit-scrollbar{display:none;width:0;height:0;}
.hide-scroll{scrollbar-width:none;-ms-overflow-style:none;}

/* ===== 响应式：平板 ===== */
@media (max-width:900px){
  .nav{overflow-x:auto;scrollbar-width:none;}
  .nav::-webkit-scrollbar{display:none;}
  .nav a{padding:8px 10px;font-size:13px;}
}

/* ===== 响应式：手机/竖屏 ===== */
@media (max-width:768px){
  html,body{height:100%;}
  body{height:100dvh;}
  .app{height:100dvh;}
  .topbar{height:auto;min-height:54px;flex-wrap:wrap;align-items:center;padding:8px 14px;gap:10px;}
  .logo .cn{font-size:22px;letter-spacing:2px;}
  .logo .en{display:none;}
  .spacer{display:none;}
  .user-box{margin-left:auto;font-size:13px;gap:8px;}
  .user-box .auth-btn{padding:6px 13px;font-size:12px;}
  .nav{order:3;flex:1 0 100%;width:100%;margin-left:0;gap:4px;padding-top:6px;border-top:1px solid var(--card-bd);}
  .nav a{font-size:13px;padding:7px 9px;white-space:nowrap;}
}
@media (max-width:480px){
  .topbar{padding:8px 10px;gap:8px;}
  .logo .cn{font-size:20px;}
  .nav a{font-size:12px;padding:6px 7px;}
  .user-box .auth-btn{padding:6px 11px;}
}