/* 身份认证页共用样式：登录 / 注册 / 忘记密码
   设计基线见 AUTH_IDENTITY_DETAILED_DESIGN_V1_20260921.md 与 UI 效果图 deliverables/identity-auth-ui-demo-20260921 */
:root{
  --shell:#07101d; --shell-deep:#030914; --shell-panel:#0c1728; --shell-line:#263248;
  --shell-text:#eef3ff; --shell-muted:#aebbd0;
  --signal:#8fb4ff; --signal-strong:#c7d8ff; --green:#72e6ac;
  --paper:#eef1f5; --surface:#ffffff; --surface-soft:#f4f6f9; --surface-sel:#e7efff;
  --text:#101722; --text-2:#455264; --text-3:#586577;
  --brand:#164fae; --brand-hover:#0d3b88; --brand-soft:#e6efff;
  --border:#d2d9e3; --border-strong:#929eae; --focus:#4c83e6;
  --danger:#a32a22; --success:#12633f; --warning:#855000;
  --font:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",Menlo,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--paper);font-family:var(--font);color:var(--text);-webkit-font-smoothing:antialiased}
a{color:var(--brand)}
.page{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);min-height:100vh}

/* ---------- 左：品牌面板 ---------- */
.brandside{position:relative;padding:56px 58px;color:var(--shell-text);display:flex;flex-direction:column;
  background:radial-gradient(1100px 520px at 12% -10%, rgb(143 180 255 / 16%), transparent 62%),
             linear-gradient(180deg,#07101d 0%,#030914 100%)}
.brandside:after{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgb(143 180 255 / 7%) 1px,transparent 1px),
                   linear-gradient(90deg,rgb(143 180 255 / 7%) 1px,transparent 1px);
  background-size:72px 72px;mask-image:linear-gradient(160deg,rgb(0 0 0 / 85%),transparent 78%)}
.brandtop{display:flex;align-items:center;justify-content:space-between;gap:20px;position:relative;z-index:2}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{width:34px;height:34px;border:1px solid rgb(143 180 255 / 46%);border-radius:6px;display:grid;place-items:center;
  background:var(--shell-panel);color:var(--signal);font-weight:800;font-size:15px}
.logo strong{font-size:16px}
.logo small{display:block;color:var(--shell-muted);font-size:11.5px;letter-spacing:.04em}
.backlink{display:inline-flex;align-items:center;gap:8px;align-self:flex-start;margin:20px 0 0;padding:9px 16px;
  border:1px solid rgb(143 180 255 / 30%);border-radius:999px;background:rgb(12 23 40 / 70%);color:#d3dceb;font-size:13px;text-decoration:none}
.brandside h1{position:relative;z-index:2;margin:auto 0 0;font-size:52px;line-height:1.04;letter-spacing:-.035em;font-weight:750}
.brandside h1 em{font-style:normal;color:var(--signal)}
.brandside .lede{position:relative;z-index:2;margin:22px 0 0;max-width:44ch;color:#c3cede;font-size:15.5px;line-height:1.7}
.protocol{position:relative;z-index:2;margin:34px 0 0;display:grid;gap:1px;border:1px solid var(--shell-line);border-radius:8px;overflow:hidden}
.protocol>div{display:grid;grid-template-columns:112px minmax(0,1fr);gap:16px;padding:13px 16px;background:rgb(12 23 40 / 78%)}
.protocol dt{color:var(--signal);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.protocol dd{margin:0;color:#d5deec;font-size:13.5px;line-height:1.55}
.brandfoot{position:relative;z-index:2;margin-top:auto;padding-top:34px;display:flex;justify-content:space-between;gap:20px;
  color:#7f8ca3;font-size:12px;border-top:1px solid rgb(143 180 255 / 12%)}
.brandfoot a{color:#9fb0c9;text-decoration:none}

/* ---------- 右：表单面板 ---------- */
.formside{padding:56px 64px;display:grid;align-content:center;gap:20px;background:var(--surface)}
.formside.compact{padding:36px 56px;gap:12px;align-content:center}
.formside.compact input[type=text],.formside.compact input[type=email],.formside.compact input[type=password],.formside.compact input[type=tel]{min-height:46px}
.formside.compact .slider{height:46px}
.formside.compact .slider .knob{height:44px}
.formside.compact .btn{min-height:46px}
.formside.compact .field label{font-size:12px}
.eyebrow{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--brand);font-weight:750}
.formside h1{margin:0;font-size:30px;letter-spacing:-.03em;line-height:1.15}
.formside form{display:grid;gap:16px}
.hint{margin:0;color:var(--text-2);font-size:13.5px;line-height:1.6}
.field{display:grid;gap:7px}
.field label{font-size:12.5px;font-weight:750;color:var(--text)}
.field .sub{color:var(--text-3);font-size:12px}
input[type=text],input[type=email],input[type=password],input[type=tel]{width:100%;min-height:50px;padding:12px 14px;
  border:1px solid var(--border-strong);border-radius:8px;background:var(--surface);font:inherit;font-size:15px;color:var(--text)}
input::placeholder{color:#7b8798}
input:focus{outline:0;border-color:var(--focus);box-shadow:0 0 0 3px rgb(76 131 230 / 18%)}
input[aria-invalid="true"]{border-color:var(--danger)}
.with-action{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center}
.btn{min-height:50px;padding:0 20px;border-radius:8px;border:1px solid transparent;font:inherit;font-size:15px;font-weight:750;cursor:pointer;white-space:nowrap}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-hover)}
.btn.ghost{background:var(--surface);border-color:var(--border-strong);color:var(--text)}
.btn.block{width:100%}
.btn.sm{min-height:40px;font-size:13.5px;padding:0 15px}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.divider{display:flex;align-items:center;gap:14px;color:var(--text-3);font-size:12px}
.divider:before,.divider:after{content:"";height:1px;background:var(--border);flex:1}
.tabs{display:grid;grid-auto-flow:column;gap:4px;padding:5px;background:var(--surface-soft);border:1px solid var(--border);border-radius:9px}
.tabs button{min-height:44px;border:0;border-radius:6px;background:transparent;color:var(--text-2);font:inherit;font-size:14px;font-weight:700;cursor:pointer}
.tabs button[aria-selected="true"]{background:var(--brand);color:#fff}
.sso-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sso{display:flex;align-items:center;gap:10px;min-height:50px;padding:0 14px;border:1px solid var(--border-strong);border-radius:8px;
  background:var(--surface);font-size:13.5px;font-weight:700;color:var(--text);cursor:pointer;text-decoration:none}
.sso i{width:22px;height:22px;display:grid;place-items:center;flex:none}
.legal{display:flex;gap:10px;align-items:flex-start;font-size:12.5px;color:var(--text-2);line-height:1.55}
.legal a{color:var(--brand);text-decoration:none}
.box{width:20px;height:20px;flex:none;margin-top:1px;border:1px solid var(--border-strong);border-radius:5px;background:var(--surface);
  display:grid;place-items:center;color:#fff;font-size:13px;cursor:pointer}
.box.on{background:var(--brand);border-color:var(--brand)}
.footrow{display:flex;justify-content:space-between;gap:16px;font-size:12.5px;color:var(--text-3)}
.footrow a{color:var(--brand);font-weight:750;text-decoration:none}
.formside{padding-bottom:92px}
.formside.compact{padding-bottom:84px}
.cookiebar{position:fixed;left:0;right:0;bottom:0;z-index:20;display:flex;align-items:center;gap:16px;padding:14px 26px;
  border-top:1px solid var(--border);background:var(--surface-soft);font-size:12.5px;line-height:1.6;color:var(--text-2);
  box-shadow:0 -8px 22px rgb(16 23 34 / 8%)}
.cookiebar p{margin:0;flex:1}
.cookiebar .acts{display:flex;gap:10px;flex:none}
.slider{position:relative;height:50px;display:flex;align-items:center;border:1px solid var(--border-strong);border-radius:9px;
  background:var(--surface-soft);overflow:hidden;user-select:none;touch-action:none}
.slider .knob{width:50px;height:48px;display:grid;place-items:center;border-radius:8px;background:var(--brand);color:#fff;font-weight:800;cursor:grab}
.slider .hint{flex:1;text-align:center;color:var(--text-3);font-size:13px}
.slider.done{border-color:var(--success)}
.slider.done .knob{background:var(--success);cursor:default}
.notice{display:flex;gap:12px;align-items:flex-start;padding:13px 15px;border-radius:9px;font-size:13px;line-height:1.6}
.notice.warn{background:#fff8ea;border:1px solid #e6cd9a;color:#6d4a06}
.notice.info{background:var(--brand-soft);border:1px solid #c3d5f8;color:#123a76}
.notice.ok{background:#eaf6ef;border:1px solid #b6ddc6;color:#124a34}
.notice.error{background:#fdecea;border:1px solid #f0b6b0;color:#8a1f18}
.notice[hidden]{display:none}
.otp{display:grid;grid-template-columns:repeat(6,64px);gap:12px}
.otp input{height:72px;min-height:72px;padding:0;text-align:center;font-size:26px;font-weight:750}
.spinner{width:14px;height:14px;border:2px solid rgb(255 255 255 / 45%);border-top-color:#fff;border-radius:50%;
  display:inline-block;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
@media (max-width:960px){
  .page{grid-template-columns:1fr}
  .brandside{padding:22px 22px 20px}
  .brandside h1{font-size:24px;margin:16px 0 0}
  .brandside .lede,.brandside .brandfoot{display:none}
  .backlink{margin-top:12px}
  .protocol{display:none}
  .formside,.formside.compact{padding:24px 22px 96px}
  .otp{grid-template-columns:repeat(6,minmax(0,1fr));gap:8px}
  .otp input{height:58px;min-height:58px}
}