.auth-shell { max-width: 1120px; min-height: 100dvh; display: flex; flex-direction: column; }
.auth-layout { display: grid; grid-template-columns: 1fr minmax(320px, 420px); align-items: center; gap: 64px; flex: 1; padding: 64px 0 80px; }
.auth-intro h1 { margin: 20px 0; font-size: clamp(40px, 5vw, 66px); line-height: 1.08; letter-spacing: -.055em; }
.auth-intro p { max-width: 340px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.auth-back { display: inline-flex; gap: 12px; margin-top: 22px; color: var(--blue); font-size: 14px; }
.auth-card { min-width: 0; padding: 34px; border: 1px solid var(--line); border-radius: 26px; background: var(--paper-strong); box-shadow: var(--shadow); }
.auth-card h2 { margin: 12px 0 8px; font-size: 28px; letter-spacing: -.04em; }
.auth-muted { color: var(--muted); font-size: 14px; line-height: 1.6; margin: 0 0 28px; }
.auth-form { display: grid; gap: 20px; }
.auth-field { display: grid; gap: 9px; min-width: 0; font-size: 14px; }
.auth-field input { display: block; width: 100%; min-width: 0; min-height: 50px; padding: 12px 14px; border: 1px solid var(--line-strong); border-radius: 12px; background: white; color: var(--ink); font-size: 16px; outline: none; }
.auth-field input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.auth-form button { width: 100%; gap: 14px; margin-top: 4px; min-height: 50px; }
.auth-notice { padding: 12px 14px; margin-bottom: 20px; border: 1px solid rgba(193,54,44,.2); border-radius: 12px; color: #a1312b; background: #fff4f1; font-size: 14px; line-height: 1.5; }
.auth-footer { display: flex; justify-content: space-between; gap: 16px; padding: 20px 0 26px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }
.auth-back:focus-visible,.auth-footer a:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
@media(max-width: 760px) {
 .auth-layout { grid-template-columns: minmax(0,1fr); gap: 30px; padding: 36px 0 46px; }
 .auth-intro h1 { font-size: 40px; margin: 14px 0; }
 .auth-intro p { margin-bottom: 0; font-size: 16px; }
 .auth-back { display: none; }
 .auth-card { padding: 26px; border-radius: 22px; }
 .auth-card h2 { font-size: 26px; }
 .auth-shell .topbar { gap: 16px; }
 .auth-shell .brand-mark { width: 40px; height: 40px; border-radius: 13px; flex-shrink: 0; }
 .auth-shell .brand { gap: 10px; }
 .auth-shell .button-alt { padding: 0 14px; font-size: 13px; }
}