/* ============ 登录/注册 - 宇宙星空主题(与首页同套视觉语言) ============
 * 基底 #070812 深空 + 紫/青双色星云 + 穿越星空画布;
 * 品牌球、渐变文字、玻璃卡片、渐变按钮全部对齐首页设计令牌。 */
body.auth-mode{background:#070812;overflow:hidden;color:#E9EBF5}
/* html 层同步深色背景 + 取消滚动条 gutter 预留:
   main.css 的 html{scrollbar-gutter:stable} 在 overflow:hidden 时仍保留右侧 gutter 条,
   该区域由 html 背景绘制(默认白色),会在星空右侧露出一条浅色边 */
html:has(>body.auth-mode){background:#070812;scrollbar-gutter:auto}
/* 穿越星空 canvas(始终存在,仅 auth-mode 时可见/运行动画)
   注意:main.css 有 canvas{height:220px!important}(Chart.js 图表专用),会强制把 #starfield
   压成 220px 高。这里用 #starfield 选择器 + !important 夺回尺寸,避免被图表规则误伤。 */
#starfield{position:fixed;inset:0;width:100vw!important;height:100vh!important;z-index:0;pointer-events:none;display:none}
body.auth-mode #starfield{display:block}
/* 星云层:紫/青双色光晕,缓慢呼吸(与首页 nebula 同色系) */
body.auth-mode::before{content:'';position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:1;pointer-events:none;
  background:
    radial-gradient(46vmax circle at 82% 12%,rgba(124,92,246,.20) 0%,rgba(124,92,246,0) 65%),
    radial-gradient(42vmax circle at 12% 88%,rgba(56,189,248,.13) 0%,rgba(56,189,248,0) 65%),
    radial-gradient(28vmax circle at 55% 55%,rgba(244,114,182,.06) 0%,rgba(244,114,182,0) 70%);
  animation:nebulaBreath 16s ease-in-out infinite}
@keyframes nebulaBreath{0%,100%{opacity:.75;transform:scale(1)}50%{opacity:1;transform:scale(1.06)}}

.auth-wrap{position:fixed;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;padding:24px;overflow:auto;z-index:100}
.auth-card{display:grid;grid-template-columns:1.1fr 1fr;border-radius:24px;overflow:hidden;padding:0;position:relative;z-index:3;height:640px;
  width:100%;max-width:980px;margin:auto;flex-shrink:0;
  background:linear-gradient(180deg,rgba(22,25,44,.9),rgba(15,17,32,.93));
  backdrop-filter:blur(24px) saturate(160%);-webkit-backdrop-filter:blur(24px) saturate(160%);
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 30px 80px rgba(0,0,0,.55),0 0 0 1px rgba(124,92,246,.12),0 0 70px rgba(124,92,246,.14);
  animation:authCardIn .8s cubic-bezier(.2,.6,.2,1) both}
@keyframes authCardIn{from{opacity:0;transform:translateY(26px) scale(.985)}to{opacity:1;transform:none}}

/* ---- 左侧:品牌/卖点区 ---- */
.auth-side{padding:48px 44px;display:flex;flex-direction:column;justify-content:space-between;gap:28px;border-right:1px solid rgba(255,255,255,.09);position:relative;overflow:hidden;
  background:linear-gradient(165deg,rgba(124,92,246,.09) 0%,rgba(28,32,58,0) 60%)}
.auth-side>*{position:relative;z-index:1}
.auth-side-brand{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:650;letter-spacing:.01em;color:#E9EBF5}
.orb-sm{width:24px;height:24px;border-radius:8px;flex-shrink:0;position:relative;
  background:linear-gradient(150deg,#8B7CF8 0%,#5EA2F8 55%,#38BDF8 100%);box-shadow:0 0 18px rgba(124,92,246,.55)}
.orb-sm::after{content:'';position:absolute;inset:7px;border-radius:50%;background:#070812;box-shadow:inset 0 0 0 1.5px rgba(233,235,245,.85)}
.auth-side-brand .sep{color:#767D99;font-weight:400;margin:0 2px}
.auth-side-brand .sub{color:#A8AEC6;font-weight:400;font-size:13px}
.auth-hero h1{font-size:34px;font-weight:750;letter-spacing:-.02em;line-height:1.2;margin-bottom:14px;color:#E9EBF5}
.auth-hero h1 .em{background:linear-gradient(96deg,#8B7CF8 0%,#5EA2F8 55%,#38BDF8 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.auth-hero p{font-size:14.5px;color:#A8AEC6;line-height:1.8;max-width:38ch}
.auth-feats{display:flex;flex-direction:column;gap:18px}
.auth-side .feat{display:flex;align-items:center;gap:13px}
.auth-side .feat .fi{width:38px;height:38px;border-radius:11px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#B4A6FF;
  background:linear-gradient(150deg,rgba(124,92,246,.24),rgba(56,189,248,.16));border:1px solid rgba(124,92,246,.3)}
.auth-side .feat b{display:block;font-size:14px;font-weight:650;color:#E9EBF5}
.auth-side .feat span{font-size:12.5px;color:#A8AEC6;line-height:1.5}
.auth-stats{display:flex;gap:30px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1)}
.astat b{display:block;font-size:22px;font-weight:750;letter-spacing:-.02em;font-variant-numeric:tabular-nums;
  background:linear-gradient(96deg,#8B7CF8 0%,#5EA2F8 55%,#38BDF8 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.astat span{font-size:12px;color:#7C83A0}

/* ---- 右侧:表单区 ---- */
.auth-form{padding:44px 40px;display:flex;flex-direction:column;justify-content:center;background:rgba(255,255,255,.05);min-height:0;overflow:hidden}
.auth-mobile-brand{display:none;align-items:center;gap:9px;font-size:15px;font-weight:650;margin-bottom:22px;color:#E9EBF5}
.auth-head{text-align:left;margin-bottom:22px}
.auth-head h2{font-size:23px;font-weight:720;letter-spacing:-.02em;color:#E9EBF5}
.auth-head p{font-size:13.5px;color:#A8AEC6;margin-top:6px}
.auth-tabs{display:flex;gap:2px;background:rgba(255,255,255,.06);border-radius:12px;padding:3px;margin-bottom:22px;border:1px solid rgba(255,255,255,.1)}
.auth-tab{flex:1;padding:8px;text-align:center;background:transparent;border:none;color:#8A90A8;
  font-size:13.5px;font-weight:600;cursor:pointer;border-radius:9px;transition:all .2s}
.auth-tab:hover{color:#C3C8DC}
.auth-tab.active{background:linear-gradient(96deg,#8B7CF8 0%,#5EA2F8 55%,#38BDF8 100%);color:#fff;box-shadow:0 4px 16px rgba(96,118,246,.4)}
#loginForm,#registerForm{flex:1;display:flex;flex-direction:column;justify-content:flex-start}
.btn-primary{width:100%;padding:12px;background:linear-gradient(96deg,#8B7CF8 0%,#5EA2F8 55%,#38BDF8 100%);border:none;border-radius:12px;color:#fff;
  font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;margin-top:6px;box-shadow:0 4px 22px rgba(96,118,246,.4)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 30px rgba(96,118,246,.55)}
.btn-primary:active{transform:scale(.98)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}
.auth-hint{margin-top:16px;font-size:13px;color:#8A90A8;text-align:left}
.auth-hint a{color:#A78BFA;cursor:pointer;text-decoration:none;font-weight:500}
.auth-hint a:hover{text-decoration:underline}
.closed-banner{margin-bottom:16px;padding:11px 16px;border-radius:12px;background:rgba(243,156,18,.12);color:#F3B34E;font-size:13px;text-align:center;border:1px solid rgba(243,156,18,.25)}
/* 妖火 OAuth 第三方登录(2026-08-27):分隔线 + 次级按钮,橙色火焰呼应"妖火" */
.oauth-divider{display:flex;align-items:center;gap:12px;margin:18px 0 12px;color:#767D99;font-size:12px}
.oauth-divider::before,.oauth-divider::after{content:'';flex:1;height:1px;background:rgba(255,255,255,.12)}
.btn-oauth{width:100%;padding:10px;display:flex;align-items:center;justify-content:center;gap:8px;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);border-radius:12px;color:#D6DAE8;
  font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}
.btn-oauth:hover{border-color:rgba(249,115,22,.55);color:#FDBA74;background:rgba(249,115,22,.08)}
.btn-oauth:active{transform:scale(.98)}
.btn-oauth svg{flex-shrink:0}
/* 输入框:深空玻璃 + 紫色聚焦辉光(表面提亮一档,避免闷黑) */
.auth-form .field label{color:#A8AEC6}
.auth-form .field input{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);color:#F2F4FA}
.auth-form .field input:focus{border-color:#8B7CF8;box-shadow:0 0 0 3.5px rgba(124,92,246,.22)}
.auth-form .field input::placeholder{color:#6E7590}
/* 邮箱验证码行(2026-09-05):输入框 + 获取验证码按钮同排 */
.code-row{display:flex;gap:8px}
.code-row input{flex:1;min-width:0}
.btn-code{flex-shrink:0;white-space:nowrap;padding:0 14px;border-radius:10px;cursor:pointer;
  background:rgba(139,124,248,.16);border:1px solid rgba(139,124,248,.45);color:#A78BFA;
  font-size:13px;font-weight:600;transition:all .2s}
.btn-code:hover{background:rgba(139,124,248,.28)}
.btn-code:disabled{opacity:.5;cursor:not-allowed}
/* 注册发码按钮冷却视觉态：不加 disabled（disabled 吞 click 导致倒计时内无法点按重开弹窗），保持可点击 */
.btn-code.cd{opacity:.55;cursor:default}
/* 已验证态（弹窗确认验证码后）：绿色稳态、按钮 disabled（不派发 click，点它不再弹码窗），保持实色不降透明度 */
.btn-code.ok{color:var(--success);border-color:rgba(52,199,89,.4);background:var(--success-dim)}
.btn-code.ok:hover{background:var(--success-dim)}
.btn-code.ok:disabled{opacity:1;cursor:default}
.auth-hint-sep{margin:0 8px;color:#5A6078}

@media (prefers-reduced-motion:reduce){
  .auth-card{animation:none}
  body.auth-mode::before{animation:none;opacity:1}
}
@media(max-width:820px){
  /* margin:auto 安全居中:视口够高时垂直居中,内容超出时仍可滚动不裁顶 */
  .auth-card{grid-template-columns:1fr;height:auto;max-height:none;margin:auto}
  /* 手机端只保留登录框,隐藏品牌/卖点区,表单顶部补品牌行 */
  .auth-side{display:none}
  .auth-mobile-brand{display:flex}
  .auth-form{padding:28px 24px;min-height:0;overflow:visible}
  /* 小屏允许页面滚动:body.auth-mode 的 overflow:hidden 会裁掉超出的表单 */
  body.auth-mode{overflow:auto}
  .auth-wrap{position:relative;min-height:100vh;padding:14px}
}
@media(max-width:480px){
  .auth-form{padding:24px 18px;min-height:0;overflow:visible}
  .auth-wrap{padding:10px}
  .auth-card{border-radius:18px}
}