/* 登录/注册整合修正：整屏滚动、12px 圆角、选填折叠与身份并排。 */
html,body{width:100%;height:100%;min-height:0!important;overflow:hidden!important;overscroll-behavior:none}
.auth-app{width:min(100%,430px);height:100dvh;min-height:0!important;overflow-x:hidden!important;overflow-y:auto!important;-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain;touch-action:pan-y}
.auth-topbar,.auth-main,.auth-intro,.auth-card,.auth-form,.field,.identity-grid,.identity-choice,.optional-section,.agreement-row{touch-action:pan-y}
.auth-main{padding-top:8px!important}
.auth-intro{margin-bottom:12px!important}
.auth-intro h2{font-size:22px!important}
.auth-card{padding:14px!important;border-radius:12px!important}
.auth-form{gap:12px!important;margin-top:14px!important}
.field-input,.code-button,.mode-tab,.auth-submit,.auth-back,.protocol-close,.optional-toggle,.optional-section{border-radius:12px!important}
.auth-tabs{border-radius:12px!important}
.auth-tab{border-radius:12px!important}
.auth-tab.selected{border-radius:999px!important}
.mode-tab.selected{border-radius:12px!important}
.field-input{height:48px!important}
.code-row{grid-template-columns:minmax(0,1fr) 112px!important;gap:8px!important}
.identity-grid{grid-template-columns:repeat(2,minmax(0,1fr))!important;gap:12px!important}
.identity-card{display:flex!important;height:82px;min-height:82px!important;padding:12px!important;flex-direction:column;justify-content:center;border-radius:12px!important}
.identity-card strong{font-size:15px!important;line-height:1.35;font-weight:600!important}
.identity-card small{display:-webkit-box!important;margin-top:5px!important;color:var(--muted)!important;font-size:11px!important;line-height:1.4!important;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;word-break:break-word}
.optional-section{overflow:hidden;border:1px solid var(--line);background:var(--field)}
.optional-toggle{width:100%;min-height:46px;padding:0 12px;display:flex;align-items:center;justify-content:space-between;gap:10px;border:0;background:transparent;color:var(--muted);font-size:12px;line-height:1.5;text-align:left;font-weight:500}
.optional-chevron{flex:none;color:var(--soft);font-size:22px;line-height:1;transform:rotate(90deg);transition:transform 250ms ease-out}
.optional-panel{display:grid;grid-template-rows:0fr;opacity:0;transition:grid-template-rows 250ms ease-out,opacity 250ms ease-out}
.optional-panel-inner{min-height:0;overflow:hidden;display:grid;gap:12px;padding:0 12px}
.optional-section.expanded .optional-chevron{transform:rotate(-90deg)}
.optional-section.expanded .optional-panel{grid-template-rows:1fr;opacity:1}
.optional-section.expanded .optional-panel-inner{padding-bottom:12px}
.agreement-row{display:grid!important;grid-template-columns:22px minmax(0,1fr)!important;gap:8px!important;align-items:flex-start!important;color:var(--soft);font-size:12px;line-height:1.7}
.agreement-row input{width:18px;height:18px;margin:2px 0 0;accent-color:var(--brand)}
.link-button{display:inline;padding:0!important;border:0!important;border-radius:0!important;background:transparent!important;color:var(--brand)!important;font:inherit;text-decoration:underline;text-underline-offset:2px;vertical-align:baseline}
.auth-submit:disabled{opacity:.38!important;cursor:not-allowed}
.protocol-overlay{position:fixed;z-index:240;inset:0;background:var(--page);touch-action:none}
.protocol-overlay[hidden]{display:none}
.protocol-shell{width:min(100%,430px);height:100%;margin:auto;display:grid;grid-template-rows:auto minmax(0,1fr);background:var(--page)}
.protocol-head{padding:calc(10px + env(safe-area-inset-top)) 16px 10px;display:grid;grid-template-columns:44px 1fr 44px;align-items:center;border-bottom:1px solid var(--line)}
.protocol-head h2{margin:0;text-align:center;font-size:18px}
.protocol-close{grid-column:3;width:44px;height:44px;border:0;background:transparent;color:var(--ink);font-size:28px}
.protocol-scroll{height:100%;min-height:0!important;padding:0!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain;touch-action:pan-y}
.protocol-body{padding:22px 16px calc(32px + env(safe-area-inset-bottom));overflow-wrap:anywhere;word-break:break-word}
.protocol-body h2{margin:0 0 22px;font-size:21px;line-height:1.4}
.protocol-body h3{margin:26px 0 10px;font-size:16px;line-height:1.5}
.protocol-body p{margin:0 0 12px;color:var(--soft);font-size:13px;line-height:1.8}
.protocol-body strong{color:var(--ink);font-weight:650}
.protocol-open .auth-app{overflow:hidden!important;touch-action:none}
@media(max-width:360px){.identity-grid{grid-template-columns:repeat(2,minmax(0,1fr))!important;gap:10px!important}.identity-card{padding:10px!important}.code-row{grid-template-columns:minmax(0,1fr) 104px!important}}
@media(prefers-reduced-motion:reduce){.optional-panel,.optional-chevron{transition:none!important}}