/* 登录/绑定/失败页（054）：白纸大标题风格
   色板：纸 #FBF7EF / 白 #FFFFFF / 线 #E8E1D4 / 墨 #1B1A17 / 次墨 #6B6659 / 焦糖 #8C5B26
   CSP：纯外部样式，无内联、无外链字体；衬线用系统字体栈。 */
:root{
  --paper:#FBF7EF; --white:#FFFFFF; --rule:#E8E1D4;
  --ink:#1B1A17; --ink-2:#6B6659; --caramel:#8C5B26;
  --danger:#9B2C1E; --danger-soft:#FBEDEA;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --r:10px; --r-btn:999px; --ease:cubic-bezier(.23,1,.32,1);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body.auth-page{
  margin:0;min-height:100vh;background:var(--paper);color:var(--ink);
  font:15px/1.6 var(--sans);-webkit-font-smoothing:antialiased;
  display:flex;flex-direction:column;
}
.auth-skip{position:absolute;left:-9999px}
.auth-skip:focus{left:16px;top:16px;z-index:10;background:var(--white);color:var(--ink);
  padding:8px 12px;border-radius:8px;border:1px solid var(--rule);text-decoration:none}

/* 左上角：全站唯一的情绪出口 */
.auth-brand{display:flex;align-items:baseline;gap:10px;padding:28px 36px 0}
.auth-logo-img{width:30px;height:30px;border-radius:8px;display:block;align-self:center;flex:none}
.auth-logo{font-family:var(--serif);font-size:24px;letter-spacing:.04em;color:var(--ink)}
.auth-brand-sub{font-size:12px;color:var(--ink-2);letter-spacing:.08em}

.auth-main{flex:1;display:flex;flex-direction:column;justify-content:center;
  width:min(100% - 32px,440px);margin:0 auto;padding:40px 0 56px}

.auth-card{background:var(--white);border:1px solid var(--rule);border-radius:var(--r);
  box-shadow:0 1px 2px rgba(0,0,0,.06);padding:36px 32px}
.auth-eyebrow{margin:0 0 10px;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2)}
.auth-title{margin:0;font-size:clamp(30px,6vw,38px);line-height:1.12;letter-spacing:-.03em;font-weight:700}
.auth-lede{margin:12px 0 24px;color:var(--ink-2);font-size:14px}
.auth-alert{margin:0 0 16px;padding:10px 12px;border-radius:8px;font-size:13px;
  background:var(--danger-soft);color:var(--danger);border:1px solid #F0C9C2}
.auth-alert-success{background:#EDF5EF;color:#1F5B3C;border-color:#C7DED0}

.auth-field{display:block;margin:0 0 16px}
.auth-field span{display:block;margin-bottom:6px;font-size:13px;font-weight:650;color:var(--ink-2)}
.auth-input{width:100%;height:44px;padding:0 12px;border:1px solid var(--rule);border-radius:8px;
  background:var(--white);color:var(--ink);font:inherit;transition:border-color 160ms var(--ease),box-shadow 160ms var(--ease)}
.auth-input::placeholder{color:#7A7568}
.auth-input:focus{outline:none;border-color:var(--caramel);box-shadow:0 0 0 3px rgba(140,91,38,.22)}
/* 初始不标红：只有服务端判定失败（aria-invalid）或浏览器校验失败才变红 */
.auth-input[aria-invalid="true"],.auth-input:user-invalid{border-color:var(--danger);box-shadow:0 0 0 3px rgba(155,44,30,.16)}

.auth-actions{margin-top:22px;display:grid;gap:12px}
.auth-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:var(--r-btn);font-size:14px;font-weight:650;
  cursor:pointer;text-decoration:none;transition:background-color 160ms var(--ease),color 160ms var(--ease),border-color 160ms var(--ease)}
.auth-btn-primary{background:var(--ink);color:var(--white);border:1px solid var(--ink)}
.auth-btn-primary:hover{background:#000}
.auth-btn-secondary{background:transparent;color:var(--ink);border:1px solid var(--rule)}
.auth-btn-secondary:hover{border-color:var(--ink)}
.auth-btn:focus-visible{outline:3px solid rgba(140,91,38,.35);outline-offset:2px}
.auth-btn svg{width:18px;height:18px;flex:0 0 18px}

.auth-divider{display:flex;align-items:center;gap:12px;margin:22px 0 16px;color:var(--ink-2);font-size:12px}
.auth-divider::before,.auth-divider::after{content:"";flex:1;height:1px;background:var(--rule)}

.auth-hint{margin:18px 0 0;font-size:12.5px;color:var(--ink-2)}
.auth-link{color:var(--caramel);text-decoration:underline;text-underline-offset:3px}
.auth-link:focus-visible{outline:3px solid rgba(140,91,38,.35);outline-offset:2px}

.auth-foot .icp-link{color:inherit;text-decoration:underline;text-underline-offset:2px}
.auth-foot{padding:0 36px 28px;font-size:12px;color:var(--ink-2);text-align:center}

@media (max-width:800px){
  .auth-brand{padding:20px 20px 0}
  .auth-main{width:100%;padding:24px 20px 40px;justify-content:flex-start}
  .auth-card{padding:26px 20px;border-radius:8px}
  .auth-input{height:48px;font-size:16px}
  .auth-btn{height:48px;font-size:15px}
  .auth-foot{padding:0 20px 24px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

.auth-back{margin:0 0 12px}

.auth-fold{margin-top:16px}
.auth-fold>summary{display:flex;list-style:none;cursor:pointer}
.auth-fold>summary::-webkit-details-marker{display:none}
.auth-fold[open]>summary{margin-bottom:16px}

/* 协议勾选行 */
.auth-consent{display:flex;align-items:flex-start;gap:10px;margin-top:20px;cursor:pointer}
.auth-consent-check{flex:none;width:18px;height:18px;margin-top:2px;cursor:pointer;accent-color:var(--caramel)}
.auth-consent-check:focus-visible{outline:3px solid rgba(140,91,38,.35);outline-offset:2px}
.auth-consent-text{font-size:13px;color:var(--ink-2);line-height:1.55}

/* 协议页 */
.legal-page{max-width:680px;margin:0 auto;padding:48px 24px 80px}
.legal-page h1{font-size:clamp(22px,4vw,30px);letter-spacing:-.02em;font-weight:700;margin:0 0 6px}
.legal-page .legal-meta{font-size:12px;color:var(--ink-2);margin:0 0 32px}
.legal-page h2{font-size:16px;font-weight:650;margin:28px 0 8px;color:var(--ink)}
.legal-page p,.legal-page li{font-size:14px;line-height:1.75;color:var(--ink);margin:0 0 10px}
.legal-page ul{padding-left:20px;margin:0 0 10px}
.legal-back{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--caramel);
  text-decoration:underline;text-underline-offset:3px;margin-bottom:24px}
.legal-back:focus-visible{outline:3px solid rgba(140,91,38,.35);outline-offset:2px}
@media(max-width:800px){.legal-page{padding:32px 20px 60px}}