:root{--auth-bg:#F7F7F5;--auth-panel:#fff;--auth-ink:#1a1a1a;--auth-body:#4d4d4d;--auth-muted:#8a8a8a;--auth-line:#EBEBE8;--auth-red:#DF2020;--auth-green:#0E8A55}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;background:var(--auth-bg);color:var(--auth-ink);font:14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit}
.auth-top{height:68px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--auth-line);background:#fff}
.auth-brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-size:15px;font-weight:750}
.auth-brand svg{width:28px;height:28px}
.auth-back{color:var(--auth-body);font-size:13px;text-decoration:none}
.auth-back:hover{color:var(--auth-red)}
.auth-layout{width:min(980px,calc(100% - 40px));margin:54px auto;display:grid;grid-template-columns:minmax(0,1fr) 430px;gap:72px;align-items:center}
.auth-intro{padding:20px 0}
.auth-kicker{margin:0 0 14px;color:#A3A19B;font-size:11px;letter-spacing:.18em}
.auth-intro h1{margin:0 0 16px;font-family:"Noto Serif SC",serif;font-size:clamp(30px,4vw,44px);line-height:1.3;letter-spacing:0}
.auth-lead{margin:0;color:var(--auth-body);font-size:15px;line-height:1.9}
.auth-state-list{display:grid;gap:12px;margin:28px 0 0;padding:0;list-style:none}
.auth-state-list li{display:flex;align-items:center;gap:10px;color:var(--auth-body);font-size:13px}
.auth-state-list i{width:9px;height:9px;flex:none;border-radius:50%;background:#C9C7C1}
.auth-state-list li:nth-child(2) i{background:#DF2020}
.auth-state-list li:nth-child(3) i{background:#17A02E}
.auth-card{padding:26px;border:1px solid var(--auth-line);border-radius:20px;background:var(--auth-panel);box-shadow:0 12px 40px rgba(0,0,0,.05)}
.auth-status{margin-bottom:18px;padding:10px 12px;border-radius:10px;background:#F7F7F5;color:var(--auth-body);font-size:12px;line-height:1.6}
.auth-status.is-subscribed{background:#EDF8F1;color:#14733F}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;margin-bottom:22px;border-bottom:1px solid var(--auth-line)}
.auth-tab{height:42px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--auth-muted);font:inherit;font-weight:650;cursor:pointer}
.auth-tab.is-active{border-bottom-color:var(--auth-red);color:var(--auth-ink)}
.auth-panel[hidden]{display:none}
.auth-method{display:flex;gap:6px;margin:0 0 16px;padding:4px;border-radius:10px;background:#F5F5F2}
.auth-method button{flex:1;height:32px;border:0;border-radius:7px;background:transparent;color:var(--auth-muted);font:inherit;font-size:12px;cursor:pointer}
.auth-method button.is-active{background:#fff;color:var(--auth-ink);box-shadow:0 1px 4px rgba(0,0,0,.07)}
.auth-form{display:grid;gap:13px}
.auth-field{display:grid;gap:6px}
.auth-field span{font-size:12px;font-weight:650;color:var(--auth-body)}
.auth-field input{width:100%;height:44px;padding:0 12px;border:1px solid #DDDAD4;border-radius:10px;outline:0;background:#fff;color:var(--auth-ink);font:inherit;font-size:13px}
.auth-field input:focus{border-color:var(--auth-red);box-shadow:0 0 0 3px rgba(223,32,32,.07)}
.auth-submit,.auth-google,.auth-secondary{width:100%;min-height:44px;border-radius:999px;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.auth-submit{margin-top:4px;border:1px solid var(--auth-red);background:var(--auth-red);color:#fff}
.auth-submit:hover{background:#C81B1B}
.auth-divider{display:flex;align-items:center;gap:10px;margin:18px 0;color:#B0AEA8;font-size:11px}
.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--auth-line)}
.auth-google{display:flex;align-items:center;justify-content:center;gap:9px;border:1px solid #DDDAD4;background:#fff;color:var(--auth-body)}
.auth-google:hover{background:#F7F7F5}
.auth-google b{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;color:#4285F4;font-size:18px;font-weight:800}
.auth-message{min-height:20px;margin:12px 0 0;color:var(--auth-red);font-size:12px;line-height:1.6}
.auth-message.is-success{color:var(--auth-green)}
.auth-note{margin:16px 0 0;color:#A3A19B;font-size:11px;line-height:1.7;text-align:center}
@media(max-width:820px){.auth-layout{grid-template-columns:1fr;gap:26px;margin:32px auto}.auth-intro{display:none}.auth-card{width:min(430px,100%);margin:0 auto}}
@media(max-width:480px){.auth-top{padding:0 18px}.auth-layout{width:calc(100% - 28px);margin:22px auto}.auth-card{padding:20px;border-radius:16px}}