.api-login-stack { width: 100%; max-width: 520px; min-width: 0; margin: 0 auto; }
.api-auth { width: min(100%, 520px); min-width: 0; }
.api-auth .api-auth-title { margin: 0 0 18px; font-size: 24px; line-height: 1.35; }
.api-auth form { min-width: 0; }
.api-auth-code-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; align-items: end; }
.api-auth-code-row .button { margin-bottom: 14px; }
.api-auth-back { margin-top: 18px; }
.api-auth-alt-action { margin-top: 12px; }
.api-auth .api-auth-terms { display: block; margin: 18px 0; line-height: 1.65; }
.api-auth .api-auth-terms input[type="checkbox"] { display: inline-block; vertical-align: middle; margin: 0 8px 0 0; }
.api-auth-terms .link-button { display: inline; white-space: normal; }
.api-auth-tabs [aria-selected="true"] { background: var(--primary-softer); color: var(--primary); box-shadow: inset 0 -2px var(--primary); }
.api-auth h3 { margin: 18px 0 12px; font-size: 18px; }
.api-auth-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 24px; }
.api-auth-tabs .button { flex: 1 1 120px; padding-inline: 10px; }
.api-auth .field, .api-auth-security .field { display: grid; gap: 7px; margin: 14px 0; }
.api-auth .field input, .api-auth-security .field input { width: 100%; min-width: 0; }
/* 原生 ::-ms-reveal 只在聚焦时出现，与自绘按钮同时显示会重复，这里只保留自绘按钮。 */
.api-auth input[type="password"]::-ms-reveal, .api-auth-security input[type="password"]::-ms-reveal { display: none; }
.api-auth-choice { display: grid; gap: 10px; margin: 12px 0 18px; padding: 14px; border: 1px solid var(--line); border-radius: 8px; }
.api-auth-choice legend { padding: 0 4px; font-weight: 700; }
.api-auth-choice label, .api-auth-terms { display: flex; align-items: flex-start; gap: 8px; line-height: 1.55; }
.api-auth-choice input[type="radio"], .api-auth-terms input[type="checkbox"] { flex: 0 0 18px; width: 18px; height: 18px; min-width: 18px; min-height: 0; padding: 0; margin: 3px 0 0; accent-color: var(--primary); }
.api-auth-hint { margin: -8px 0 14px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.api-auth-identity-hint[aria-hidden="true"] { visibility: hidden; }
.api-auth-error { padding: 10px 12px; color: var(--danger); background: var(--danger-soft); border-radius: 6px; }
.api-auth-link { padding: 14px; border: 1px solid var(--line); border-radius: 8px; overflow-wrap: anywhere; }
.api-auth-link p { line-height: 1.65; }
.api-auth-code { display: block; padding: 9px; background: #f4f7f7; border-radius: 5px; user-select: all; }
.api-auth-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.api-auth-actions .button { flex: 1 1 170px; }
.api-auth-security { display: grid; gap: 12px; padding: 18px 0; }
.api-auth-security form { min-width: 0; }
.api-auth-security > section { min-width: 0; }
.api-wechat-panel { min-width: 0; display: grid; gap: 12px; justify-items: center; text-align: center; }
.api-wechat-instruction { margin: 0; font-size: 16px; line-height: 24px; }
.api-wechat-actions { margin-top: 18px; }
.api-wechat-viewport { position: relative; width: min(100%, 260px); aspect-ratio: 260 / 280; overflow: hidden; }
.api-wechat-qr { position: absolute; inset: 0 auto auto 0; display: block; width: 260px; max-width: none; height: 280px; margin: 0; border: 0; transform-origin: top left; }
.api-wechat-qr[inert] { filter: blur(16px); opacity: 0.35; pointer-events: none; }
.api-wechat-actions .button { min-height: 44px; }
.binding-security { max-width: 800px; }
.binding-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 96px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.binding-row h3 { margin: 0 0 6px; font-size: 16px; }
.binding-row p { margin: 0; color: var(--muted); overflow-wrap: anywhere; }
.binding-row > div { min-width: 0; }
.binding-row .button, .binding-verified { flex: 0 0 auto; }
.binding-verified { color: var(--primary); font-size: 14px; }
.binding-form { max-width: 460px; padding-top: 22px; }
.binding-form .field { display: grid; gap: 8px; margin: 14px 0; }
.binding-form input { width: 100%; min-width: 0; }
.binding-security > .button { margin-top: 18px; }
.binding-row:focus { outline: none; }
.binding-actions { display: flex; align-items: center; gap: 16px; flex: 0 0 auto; }
.binding-row .binding-limit { margin-top: 6px; font-size: 13px; line-height: 1.5; }
.binding-policy { margin: 8px 0 0; line-height: 1.6; }
@media (max-width: 480px) { .binding-actions { gap: 10px; } .binding-actions .button { padding-inline: 12px; } .binding-row { gap: 12px; } }
.api-auth-reverse { padding-top: 16px; border-top: 1px solid var(--line); overflow-wrap: anywhere; }
.api-auth-reverse p { line-height: 1.65; }
.api-auth-confirm { padding: 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--primary-softer); }
.api-auth-confirm-code { display: block; margin: 10px 0; font: 800 28px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .3em; }
.api-auth-confirm-match { display: flex; align-items: flex-start; gap: 8px; margin: 12px 0; line-height: 1.6; }
.api-auth-confirm-match input[type="checkbox"] { flex: 0 0 18px; width: 18px; height: 18px; min-width: 18px; min-height: 0; padding: 0; margin: 3px 0 0; accent-color: var(--primary); }
@media (max-width: 480px) { .api-auth-tabs .button { flex-basis: calc(50% - 8px); } .api-auth-actions { display: grid; } .api-auth-code-row { gap: 8px; } .api-auth-code-row .button { padding-inline: 12px; } }