.auth { min-height: 100vh; display: grid; grid-template-columns: 1.05fr 1fr; }
    /* Brand side */
    .auth-brand { position: relative; background: linear-gradient(150deg, var(--primary), var(--primary-dark) 70%, #0d8578); color: #fff; padding: 54px 56px; display: flex; flex-direction: column; overflow: hidden; }
    .auth-brand::before { content: ""; position: absolute; top: -100px; right: -80px; width: 340px; height: 340px; background: rgba(255,255,255,.08); border-radius: 50%; }
    .auth-brand::after { content: ""; position: absolute; bottom: -120px; left: -60px; width: 300px; height: 300px; background: rgba(18,165,148,.25); border-radius: 50%; }
    .auth-brand .brand .brand-txt b { color: #fff; }
    .auth-brand .brand .brand-txt span { color: rgba(255,255,255,.75); }
    .auth-brand .mark { background: rgba(255,255,255,.16); box-shadow: none; }
    .auth-hero { margin-top: auto; position: relative; }
    .auth-hero h2 { color: #fff; font-size: 2.1rem; letter-spacing: -.02em; line-height: 1.25; }
    .auth-hero p { color: rgba(255,255,255,.85); margin-top: 14px; font-size: 1.05rem; max-width: 420px; }
    .auth-points { margin-top: 30px; display: flex; flex-direction: column; gap: 14px; position: relative; }
    .auth-points li { display: flex; align-items: center; gap: 13px; color: #eaf3ff; font-size: .98rem; }
    .auth-points i { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; background: rgba(255,255,255,.15); font-size: 1rem; }
    /* Form side */
    .auth-form-wrap { display: flex; align-items: center; justify-content: center; padding: 40px 28px; background: var(--bg-soft); }
    .auth-card { width: 100%; max-width: 400px; }
    .auth-card .back { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: .9rem; margin-bottom: 26px; transition: color .2s; }
    .auth-card .back:hover { color: var(--primary); }
    .auth-card h1 { font-size: 1.7rem; letter-spacing: -.02em; }
    .auth-card .sub { color: var(--muted); margin-top: 6px; margin-bottom: 28px; }
    .field { margin-bottom: 18px; }
    .field label { display: block; font-family: var(--font-head); font-weight: 500; font-size: .9rem; color: var(--ink); margin-bottom: 7px; }
    .field .input { position: relative; }
    .field .input i { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 1.05rem; }
    .field input { width: 100%; padding: 13px 15px 13px 44px; border: 1.5px solid var(--line); border-radius: var(--radius-sm); font-family: var(--font-body); font-size: .97rem; color: var(--ink); background: #fff; transition: border-color .2s, box-shadow .2s; }
    .field input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
    .field .toggle-pass { left: auto; right: 15px; cursor: pointer; }
    .auth-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; font-size: .9rem; }
    .auth-row label { display: flex; align-items: center; gap: 8px; color: var(--body); cursor: pointer; }
    .auth-row a { color: var(--primary); font-weight: 500; }
    .btn-block { width: 100%; }
    .auth-note { margin-top: 18px; padding: 12px 14px; background: var(--accent-soft); border-radius: var(--radius-sm); font-size: .84rem; color: #0d7d6f; display: flex; gap: 9px; align-items: flex-start; }
    .auth-foot { text-align: center; margin-top: 22px; font-size: .9rem; color: var(--muted); }
    .auth-foot a { color: var(--primary); font-weight: 500; }
    .login-err { display: none; margin-top: 14px; padding: 12px 15px; background: #fdecec; color: #c0392b; border-radius: var(--radius-sm); font-size: .87rem; align-items: flex-start; gap: 9px; }
    .login-err.show { display: flex; }
    @media (max-width: 860px) { .auth { grid-template-columns: 1fr; } .auth-brand { display: none; } }