:root{
  --bg:#f3f8fc;--panel:#ffffff;--text:#132235;--muted:#66778a;--line:#d9e5ef;
  --blue:#1769aa;--blue-strong:#0f568f;--green:#6aa94f;--danger:#b23838;
  --shadow:0 24px 70px rgba(31,76,115,.14);
}
:root[data-theme="dark"]{
  --bg:#0d1620;--panel:#121f2b;--text:#edf5fb;--muted:#9fb0bf;--line:#263a4b;
  --blue:#4b9bd4;--blue-strong:#6eb1df;--green:#86c66e;--danger:#ff9292;
  --shadow:0 28px 80px rgba(0,0,0,.36);
}
*{box-sizing:border-box}
html,body{min-height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:Tahoma,"Segoe UI",sans-serif}
button,input{font:inherit}
.auth-shell{min-height:100vh;display:grid;grid-template-columns:minmax(320px,.85fr) minmax(420px,1.15fr)}
.brand-panel{position:relative;overflow:hidden;padding:clamp(42px,7vw,92px);display:flex;flex-direction:column;justify-content:center;gap:28px;background:linear-gradient(145deg,#0d5790,#1774b4 60%,#448e72);color:#fff}
.brand-panel:before,.brand-panel:after{content:"";position:absolute;border:1px solid rgba(255,255,255,.13);border-radius:50%;width:420px;height:420px;left:-190px;top:-120px}
.brand-panel:after{width:620px;height:620px;left:auto;right:-390px;top:auto;bottom:-360px}
.brand-mark{width:72px;height:72px;border-radius:22px;display:grid;place-items:center;font-size:34px;font-weight:800;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);backdrop-filter:blur(10px)}
.eyebrow{margin:0 0 8px;font-size:13px;letter-spacing:.04em;opacity:.78}
.brand-panel h1{font-size:clamp(48px,7vw,78px);letter-spacing:.06em;margin:0}
.brand-copy{max-width:530px;line-height:2;margin:12px 0 0;opacity:.88}
.security-points{display:flex;flex-wrap:wrap;gap:9px}
.security-points span{padding:8px 11px;border:1px solid rgba(255,255,255,.2);border-radius:999px;font-size:12px;background:rgba(255,255,255,.08)}
.login-panel{display:grid;place-items:center;padding:34px}
.login-card{width:min(100%,480px);background:var(--panel);border:1px solid var(--line);border-radius:26px;padding:32px;box-shadow:var(--shadow)}
.login-card header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.login-card h2{font-size:28px;margin:0}
.intro{color:var(--muted);line-height:1.9;margin:14px 0 26px;font-size:14px}
.icon-button,.password-toggle{border:1px solid var(--line);background:transparent;color:var(--text);cursor:pointer}
.icon-button{width:42px;height:42px;border-radius:13px}
.field{display:grid;gap:8px;margin-bottom:18px;font-size:13px;font-weight:600}
.field input{width:100%;height:49px;border:1px solid var(--line);border-radius:13px;padding:0 14px;background:var(--panel);color:var(--text);outline:none;transition:.18s border,.18s box-shadow}
.field input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(23,105,170,.12)}
.password-wrap{position:relative;display:block}
.password-wrap input{padding-left:75px}
.password-toggle{position:absolute;left:7px;top:7px;height:35px;border-radius:9px;padding:0 10px;color:var(--muted)}
.form-row{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:2px 0 22px}
.remember{display:flex;gap:8px;align-items:center;font-size:13px;color:var(--text);cursor:pointer}
.remember input{accent-color:var(--blue)}
.session-note{font-size:12px;color:var(--muted)}
.primary-button{height:52px;width:100%;border:0;border-radius:14px;background:linear-gradient(90deg,var(--blue-strong),var(--blue));color:#fff;font-weight:700;cursor:pointer;display:flex;justify-content:center;align-items:center;gap:10px;transition:.18s transform,.18s opacity}
.primary-button:hover:not(:disabled){transform:translateY(-1px)}
.primary-button:disabled{opacity:.68;cursor:wait}
.spinner{display:none;width:17px;height:17px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
.primary-button.busy .spinner{display:block}
@keyframes spin{to{transform:rotate(360deg)}}
.message{min-height:23px;margin:14px 0 0;font-size:13px;color:var(--muted);line-height:1.7}
.message.error{color:var(--danger)}
.message.success{color:var(--green)}
.hint{font-size:12px;color:var(--muted);margin:-10px 0 14px}
.warning{color:#ae6a00}
.login-card footer{display:flex;gap:8px;align-items:center;border-top:1px solid var(--line);margin-top:22px;padding-top:18px;color:var(--muted);font-size:12px}
.lock{color:var(--green);font-size:10px}
.support{text-align:center;color:var(--muted);font-size:12px;margin:18px 0 0}
@media(max-width:860px){
  .auth-shell{grid-template-columns:1fr}
  .brand-panel{min-height:260px;padding:38px}
  .brand-panel h1{font-size:48px}
  .brand-copy{margin-top:8px}
  .login-panel{padding:22px}
}
@media(max-width:520px){
  .brand-panel{min-height:210px;padding:28px;gap:16px}
  .brand-mark{width:54px;height:54px;border-radius:17px;font-size:26px}
  .brand-copy,.security-points{display:none}
  .login-card{padding:24px 19px;border-radius:21px}
  .form-row{align-items:flex-start;flex-direction:column;gap:8px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}