:root{--ink:#16233B;--rule:rgba(160,190,235,.13);--accent:#E0A526;--text:#1A2233;--muted:#6B7486}
*{box-sizing:border-box}
body{margin:0;font-family:'Manrope',system-ui,sans-serif;color:var(--text);background:#fff}
.login{display:grid;grid-template-columns:1.1fr 1fr;min-height:100vh}
/* left: ruled notebook page in school navy */
.notebook{position:relative;background-color:var(--ink);
  background-image:linear-gradient(90deg,transparent 78px,var(--accent) 78px,var(--accent) 80px,transparent 80px),
  repeating-linear-gradient(180deg,transparent 0,transparent 35px,var(--rule) 35px,var(--rule) 36px);
  color:#fff;display:flex;align-items:center;padding:60px 60px 60px 120px}
.notebook::before{content:"";position:absolute;left:28px;top:0;bottom:0;width:22px;
  background:radial-gradient(circle at 11px 11px,#0E1728 7px,transparent 8px) 0 0/22px 72px repeat-y}
.nb-inner{max-width:480px}
.nb-logo{width:64px;height:64px;border-radius:14px;background:var(--accent);display:grid;place-items:center;margin-bottom:34px;overflow:hidden}
.nb-logo span{font-weight:800;color:var(--ink);font-size:22px}
.nb-logo img{width:100%;height:100%;object-fit:contain;background:#fff}
.notebook h1{font-family:'Fraunces',Georgia,serif;font-weight:700;font-size:clamp(2.2rem,3.6vw,3.3rem);line-height:1.08;margin:0 0 14px;letter-spacing:-.015em}
.tag{font-size:1.1rem;color:#C9D4E8;margin:0 0 44px;line-height:36px}
.nb-lines{list-style:none;padding:0;margin:0 0 44px}
.nb-lines li{line-height:36px;color:#E6ECF7;font-weight:500;display:flex;gap:12px;align-items:center}
.nb-lines i{color:var(--accent)}
.nb-foot{color:#8C9AB5;font-size:.9rem;margin:0}
/* right */
.form-side{display:flex;align-items:center;justify-content:center;padding:40px 24px;background:#F6F7FA}
.login-card{width:100%;max-width:400px;background:#fff;border:1px solid #E3E7EF;border-radius:16px;padding:36px 32px}
.login-card h2{font-family:'Fraunces',Georgia,serif;font-size:1.9rem;margin:0 0 6px;font-weight:700}
.sub{color:var(--muted);margin:0 0 24px;font-size:.93rem;line-height:1.5}
label{display:block;font-weight:600;font-size:.87rem;margin:16px 0 7px}
.inp{position:relative;display:flex;align-items:center}
.inp>i{position:absolute;left:14px;color:#98A1B3}
.inp input{width:100%;height:50px;border:1px solid #D5DBE6;border-radius:10px;padding:0 44px;font:inherit;font-size:16px;transition:border-color .15s,box-shadow .15s}
.inp input:focus{outline:0;border-color:#2A5190;box-shadow:0 0 0 3px rgba(42,81,144,.15)}
.eye{position:absolute;right:6px;background:none;border:0;width:38px;height:38px;cursor:pointer;color:#6B7486;font-size:17px}
.submit{margin-top:26px;width:100%;height:52px;border:0;border-radius:10px;background:var(--ink);color:#fff;font:inherit;font-weight:700;font-size:16px;cursor:pointer}
.submit:hover{background:#1F3358}
.submit:focus-visible,.back:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.err{background:#FBE7E5;color:#8E2B25;border-radius:9px;padding:11px 14px;font-weight:600;font-size:.92rem}
.back{display:inline-flex;gap:6px;margin-top:22px;color:var(--muted);text-decoration:none;font-size:.9rem}
.back:hover{color:var(--text)}
.mobile-brand{display:none}
@media screen and (max-width:860px){
  .login{grid-template-columns:1fr}
  .notebook{display:none}
  .form-side{align-items:flex-start;padding:0;background:var(--ink);min-height:100vh}
  .login-card{max-width:none;border:0;border-radius:24px 24px 0 0;margin-top:170px;min-height:calc(100vh - 170px);padding:30px 22px calc(30px + env(safe-area-inset-bottom))}
  .mobile-brand{display:flex;align-items:center;gap:12px;position:absolute;top:calc(56px + env(safe-area-inset-top));left:22px;right:22px;color:#fff}
  .mobile-brand span{width:52px;height:52px;border-radius:13px;background:var(--accent);color:var(--ink);display:grid;place-items:center;font-weight:800}
  .mobile-brand strong{font-family:'Fraunces',Georgia,serif;font-size:1.35rem;line-height:1.15}
}