:root{--bg:#0d1420;--panel:#172231;--line:#2a3a4b;--text:#e9f0f6;--muted:#9aabba;--accent:#38b9a1;--brand:#184d88;--brand-deep:#153f73;--ink:#1d2b3a;--ink-muted:#6b7d90;--field:#f4f7fa;--field-line:#d5dee8;--danger:#d14b4b}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:14px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
button,input{font:inherit}

.login-shell{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(420px,.75fr)}

/* ---------- 左侧品牌区 ---------- */
.brand-side{position:relative;overflow:hidden;display:flex;flex-direction:column;gap:30px;padding:44px 56px 32px;background:radial-gradient(120% 90% at 0% 0%,#163452 0%,transparent 55%),radial-gradient(90% 70% at 100% 100%,#123c3a 0%,transparent 60%),var(--bg)}
.brand-grid{position:absolute;inset:0;background-image:linear-gradient(#ffffff08 1px,transparent 1px),linear-gradient(90deg,#ffffff08 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(180deg,#000 0%,#0000 85%);pointer-events:none}
.brand-side>*{position:relative}
.brand-tag{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border:1px solid #2f4a61;border-radius:999px;background:#ffffff08;color:#a9c0d0;font-size:12px;letter-spacing:.4px}
.brand-tag i{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px #38b9a12e}
.brand-copy{max-width:560px;margin-top:auto}
.brand-kicker{color:var(--accent);font-size:13px;font-weight:700;letter-spacing:2px;margin-bottom:10px}
.brand-copy h1{margin:0;font-size:clamp(32px,3.4vw,46px);line-height:1.18;letter-spacing:2px;font-weight:800}
.brand-copy p{margin:16px 0 0;color:var(--muted);font-size:15px;max-width:440px}

.spectrum-card{margin:0;max-width:620px;padding:16px 18px 12px;border:1px solid #2a3d50;border-radius:12px;background:linear-gradient(180deg,#17243499,#111b2999);backdrop-filter:blur(6px);box-shadow:0 20px 50px #0006}
.spectrum-card figcaption{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted);margin-bottom:6px}
.spectrum-card .live{display:inline-flex;align-items:center;gap:7px;color:#c8d8e4}
.spectrum-card .live i{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:pulse 1.6s ease-in-out infinite}
.spectrum-card .live b{color:var(--accent);font-size:15px;font-variant-numeric:tabular-nums;min-width:38px;text-align:right}
#spectrum-art{display:block;width:100%;height:190px}
#spectrum-art .axis line{stroke:#24384b;stroke-width:1;stroke-dasharray:3 5}
#ghost-lines path{fill:none;stroke:#5fa6d6;stroke-width:1;opacity:.18}
#scan-line{stroke:#43f5cc;stroke-width:1;opacity:.35}
.axis-labels{display:flex;justify-content:space-between;color:#6f889b;font-size:10px;font-variant-numeric:tabular-nums;padding-top:4px}

.feature-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;max-width:620px}
.feature-list li{padding:12px 14px;border:1px solid #243649;border-radius:10px;background:#ffffff05}
.feature-list b{display:block;color:var(--accent);font-size:13px;margin-bottom:2px}
.feature-list span{color:#b6c6d3;font-size:12px}
.brand-foot{margin-top:auto;color:#5f768a;font-size:12px}

/* ---------- 右侧表单区 ---------- */
.form-side{position:relative;display:flex;align-items:center;justify-content:center;padding:48px 40px;background:#fff;color:var(--ink);border-top:4px solid var(--brand)}
.form-wrap{width:100%;max-width:380px;animation:rise .5s ease-out both}
.form-logo{display:block;width:100%;max-width:340px;height:auto;margin:0 0 36px}
.form-head h2{margin:0;font-size:24px;letter-spacing:1px;color:var(--brand-deep)}
.form-head p{margin:6px 0 26px;color:var(--ink-muted);font-size:13px}

.field{display:block;margin-bottom:16px}
.field-label{display:block;font-size:13px;font-weight:600;color:#33475b;margin-bottom:7px}
.input-box{position:relative;display:flex;align-items:center;height:46px;border:1px solid var(--field-line);border-radius:8px;background:var(--field);transition:border-color .15s,box-shadow .15s,background .15s}
.input-box>svg{width:18px;height:18px;margin:0 2px 0 13px;fill:#8a9bad;flex:none;transition:fill .15s}
.input-box input{flex:1;min-width:0;height:100%;border:0;outline:0;background:transparent;padding:0 12px 0 8px;color:var(--ink);font-size:15px}
.input-box input::placeholder{color:#a3b1bf}
.input-box:focus-within{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px #184d881f}
.input-box:focus-within>svg{fill:var(--brand)}
.field.invalid .input-box{border-color:var(--danger);box-shadow:0 0 0 3px #d14b4b1a}
.pw-toggle{display:grid;place-items:center;width:42px;height:100%;border:0;background:none;cursor:pointer;border-radius:0 8px 8px 0}
.pw-toggle svg{width:19px;height:19px;fill:#8a9bad}
.pw-toggle:hover svg{fill:var(--brand)}
.pw-toggle:focus-visible{outline:2px solid var(--brand);outline-offset:-3px}
.pw-toggle .eye-closed{display:none}
.pw-toggle[aria-pressed="true"] .eye-open{display:none}
.pw-toggle[aria-pressed="true"] .eye-closed{display:block}
.caps-hint{margin:-8px 0 12px;color:#b7791f;font-size:12px}

.form-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:4px 0 18px;font-size:13px}
.remember{display:inline-flex;align-items:center;gap:7px;color:#45596d;cursor:pointer;user-select:none}
.remember input{width:16px;height:16px;margin:0;accent-color:var(--brand)}
.help-text{color:#93a3b3;font-size:12px}

.form-error{min-height:20px;margin:-6px 0 10px;color:var(--danger);font-size:13px}
.form-error:empty{visibility:hidden}

.submit-btn{position:relative;width:100%;height:48px;border:0;border-radius:8px;background:linear-gradient(90deg,var(--brand) 0%,#1f6aa8 100%);color:#fff;font-size:16px;font-weight:700;letter-spacing:4px;cursor:pointer;box-shadow:0 10px 22px #184d8833;transition:transform .12s,box-shadow .15s,filter .15s}
.submit-btn:hover{filter:brightness(1.08);box-shadow:0 12px 26px #184d8844}
.submit-btn:active{transform:translateY(1px)}
.submit-btn:focus-visible{outline:3px solid #184d8855;outline-offset:2px}
.submit-btn .spinner{display:none;position:absolute;right:18px;top:50%;width:18px;height:18px;margin-top:-9px;border:2px solid #ffffff66;border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
.submit-btn.loading{cursor:progress;filter:saturate(.7)}
.submit-btn.loading .spinner{display:block}
.submit-btn:disabled{opacity:.85}

.form-foot{display:flex;align-items:center;gap:6px;margin:26px 0 0;padding-top:18px;border-top:1px solid #e6ecf2;color:#8a9aab;font-size:12px}
.form-foot svg{width:15px;height:15px;fill:#9fb4c7;flex:none}

.support-credit{position:absolute;left:0;right:0;bottom:18px;margin:0;text-align:center;color:#a3b0bd;font-size:12px;letter-spacing:.3px}
.support-credit .credit-at{color:#7f9bb8;margin:0 1px 0 2px}
.shake{animation:shake .4s ease}

@keyframes spin{to{transform:rotate(360deg)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes shake{0%,100%{transform:none}20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}

@media (max-width:1100px){
  .login-shell{grid-template-columns:minmax(0,1fr) minmax(400px,.9fr)}
  .brand-side{padding:36px 36px 28px}
  .feature-list{grid-template-columns:1fr 1fr}
  .feature-list li:last-child{display:none}
}
@media (max-width:820px){
  .login-shell{grid-template-columns:1fr;grid-template-rows:auto 1fr}
  .brand-side{gap:14px;padding:22px 20px 20px}
  .brand-copy{margin-top:6px}
  .brand-copy h1{font-size:26px;letter-spacing:1px}
  .brand-copy h1 br{display:none}
  .brand-copy p{font-size:13px;margin-top:8px}
  .brand-kicker{font-size:12px;margin-bottom:4px}
  .spectrum-card{padding:10px 12px 8px}
  #spectrum-art{height:96px}
  .feature-list,.brand-foot,.brand-top{display:none}
  .form-side{align-items:flex-start;padding:30px 16px 40px}
  .form-logo{max-width:280px;margin-bottom:26px}
  .form-side{flex-direction:column;align-items:center}
  .support-credit{position:static;margin-top:36px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}

/* ---------- 2026-10-17 改版：山大标识 + 发酵罐数字孪生 ---------- */
.brand-top{display:flex;align-items:center;gap:14px}
.brand-emblem{width:46px;height:46px;opacity:.92}
.brand-body{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:28px}
.brand-body .brand-copy{margin-top:0}
.brand-body .feature-list{margin-top:28px;grid-template-columns:1fr;max-width:380px;gap:10px}
.vessel{position:relative;margin:0;height:min(74vh,720px);aspect-ratio:.6709}
.vessel img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;filter:drop-shadow(0 18px 40px #0009)}
.vessel::before{content:"";position:absolute;left:12%;right:12%;bottom:0;height:8%;border-radius:50%;background:radial-gradient(closest-side,#2fd0ec26,transparent);pointer-events:none}
.tag{position:absolute;z-index:2;display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid #2fd0ec55;border-radius:999px;background:#071a2ee6;color:#cfe9f5;font-size:11.5px;white-space:nowrap;transform:translate(14px,-50%)}
.tag i{position:absolute;top:50%;width:7px;height:7px;margin-top:-3.5px;border-radius:50%;background:#2fd0ec;box-shadow:0 0 0 3px #2fd0ec33;animation:pulse 2.4s ease-in-out infinite}
.tag::before{content:"";position:absolute;top:50%;height:1px;width:14px;background:#2fd0ec88}
.tag-r i{left:-17px}.tag-r::before{left:-14px}
.tag-l{transform:translate(calc(-100% - 14px),-50%)}
.tag-l i{right:-17px}.tag-l::before{right:-14px}
.form-logo{max-width:300px;margin:0 0 30px}
.brand-foot{margin-top:0;letter-spacing:1px}
@media (max-width:1280px){.vessel{height:min(64vh,600px)}}
@media (max-width:1100px){.brand-body{grid-template-columns:1fr}.vessel{display:none}}
.brand-body .brand-copy h1{font-size:clamp(28px,2.6vw,40px)}
.tag-b{transform:translate(-50%,30px)}
.tag-b i{left:50%;top:-30px;margin:0 0 0 -3.5px}
.tag-b::before{left:50%;top:-26px;width:1px;height:26px}
.nowrap{white-space:nowrap}
.brand-body .brand-copy h1{font-size:clamp(26px,2.3vw,38px)}
/* 校徽保持山大红原色：垫白色圆底，不做任何改色 */
.brand-emblem{display:grid;place-items:center;width:50px;height:50px;border-radius:50%;background:#fff;opacity:1;box-shadow:0 0 0 3px #ffffff14}
.brand-emblem img{width:42px;height:42px}

/* 2026-10-28 备案号（表单侧底部居中，链接工信部备案系统） */
.icp-record a{color:inherit;text-decoration:none}
.icp-record a:hover{color:#5d7186;text-decoration:underline}