.auth-shell { min-height: 100vh; display: flex; flex-direction: column; }
.site-header { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-4) clamp(1rem, 4vw, 3.5rem); background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.brand { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--color-ink); text-decoration: none; font-weight: 800; letter-spacing: -0.03em; }
.brand img { width: 38px; height: 38px; }
.brand-name { font-size: var(--font-size-lg); }
.header-link { font-size: var(--font-size-sm); font-weight: 650; text-decoration: none; }
.auth-main { width: 100%; flex: 1; display: grid; place-items: center; padding: clamp(1.5rem, 5vw, 4rem) var(--space-4); }
.auth-card { width: min(100%, 470px); padding: clamp(1.5rem, 4vw, 2.5rem); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: var(--shadow-card); }
.auth-eyebrow { margin: 0 0 var(--space-2); color: var(--color-primary); font-size: var(--font-size-xs); font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.auth-title { margin: 0; font-size: var(--font-size-2xl); line-height: 1.2; letter-spacing: -0.035em; }
.auth-intro { margin: var(--space-3) 0 var(--space-6); color: var(--color-muted); font-size: var(--font-size-sm); }
.form-field { margin-bottom: var(--space-4); }
.form-field label { display: block; margin-bottom: var(--space-2); font-size: var(--font-size-sm); font-weight: 700; }
.form-field input, .form-field select { display: block; width: 100%; min-height: 48px; padding: 0.75rem 0.875rem; color: var(--color-ink); border: 1px solid #bfc7d1; border-radius: var(--radius-sm); background: #fff; }
.form-field input::placeholder { color: #7a8492; }
.form-field input[aria-invalid="true"], .form-field select[aria-invalid="true"] { border-color: var(--color-danger); }
.field-error { min-height: 1.25rem; margin: var(--space-1) 0 0; color: var(--color-danger); font-size: var(--font-size-xs); }
.password-wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; }
.password-wrap input { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.password-toggle { min-width: 66px; border: 1px solid #bfc7d1; border-left: 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--color-ink); background: #f7f8fa; cursor: pointer; font-size: var(--font-size-sm); font-weight: 700; }
.form-meta { display: flex; justify-content: flex-end; margin: 0 0 var(--space-5); font-size: var(--font-size-sm); }
.button { display: inline-flex; width: 100%; min-height: 48px; align-items: center; justify-content: center; padding: 0.75rem 1rem; border: 0; border-radius: var(--radius-sm); color: #fff; background: var(--color-primary); cursor: pointer; font-weight: 750; transition: background 120ms ease, transform 120ms ease; }
.button:hover { background: var(--color-primary-hover); }
.button:active { transform: translateY(1px); }
.button:disabled { cursor: wait; opacity: 0.7; }
.message { margin: 0 0 var(--space-4); padding: 0.8rem 0.9rem; border: 1px solid transparent; border-radius: var(--radius-sm); font-size: var(--font-size-sm); }
.message--error { color: var(--color-danger); background: var(--color-danger-bg); border-color: #f1c5ca; }
.message--success { color: var(--color-success); background: var(--color-success-bg); border-color: #b8e3c8; }
.message--info { color: var(--color-ink); background: #eef3fa; border-color: #d7e3f4; }
.auth-bottom { margin: var(--space-5) 0 0; color: var(--color-muted); text-align: center; font-size: var(--font-size-sm); }
.auth-bottom a { font-weight: 750; }
.auth-footer { padding: var(--space-5) var(--space-4); color: var(--color-muted); text-align: center; font-size: var(--font-size-xs); }
.helper-text { margin: var(--space-2) 0 0; color: var(--color-muted); font-size: var(--font-size-xs); }
@media (max-width: 520px) {
  .site-header { min-height: 66px; }
  .auth-main { align-items: start; padding-top: var(--space-6); }
  .auth-card { box-shadow: 0 8px 28px rgba(28, 35, 45, 0.06); }
  .auth-title { font-size: var(--font-size-xl); }
}