/* R248 style.css */
:root{--primary:#3B82F6;--bg:#EFF6FF;--card:#FFF;--text:#1E3A8A;--text-secondary:#2563EB;--border:#BFDBFE;--success:#10B981;--contact-footer-h:92px;--bottom-nav-h:52px;--safe-area-bottom:env(safe-area-inset-bottom,0px);--bottom-chrome-h:calc(var(--contact-footer-h) + var(--bottom-nav-h));--float-gap:12px;--zw-fab-size:56px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif;background:var(--bg);color:var(--text);max-width:480px;margin:0 auto}
body.has-contact-footer.has-bottom-nav{padding-bottom:calc(var(--bottom-chrome-h) + 8px + var(--safe-area-bottom))}
body.share-page{padding-bottom:calc(var(--contact-footer-h) + 16px)}
button,input{font:inherit}a{color:inherit;text-decoration:none}
.app-header{padding:12px 16px 8px;text-align:center;background:var(--card);border-bottom:1px solid var(--border);position:relative;position:sticky;top:0;z-index:60}
.app-header h1{font-size:18px}.app-sub{font-size:12px;color:var(--text-secondary);margin-top:4px}
.header-share{position:absolute;right:12px;top:14px;color:var(--primary)}
.view-inner{padding:12px 16px}
.quiz-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px;text-align:center;margin-top:12px}
.question{font-size:32px;font-weight:800;margin:16px 0;color:var(--primary)}
.ans-input{width:100%;padding:14px;font-size:24px;text-align:center;border:2px solid var(--border);border-radius:12px;margin-bottom:12px}
.progress{text-align:center;font-size:13px;color:var(--text-secondary)}
.kpi-row{display:flex;gap:8px;margin-bottom:12px}
.kpi-card{flex:1;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:12px;text-align:center}
.kpi-val{display:block;font-size:22px;font-weight:700;color:var(--primary)}
.kpi-label{font-size:10px;color:var(--text-secondary)}
.rec-row{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--border);font-size:13px}
.level-btn{display:block;width:100%;padding:14px;margin-bottom:8px;border:2px solid var(--border);border-radius:12px;background:var(--card);font-size:15px;cursor:pointer;text-align:left}
.level-btn.active{border-color:var(--primary);background:var(--primary);color:#fff}
.btn{border:none;border-radius:10px;padding:12px;font-size:15px;font-weight:600;min-height:48px;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff}.btn-block{width:100%;margin-top:8px}
.theme-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin:12px 0}
.theme-btn{height:36px;border-radius:10px;border:2px solid transparent;cursor:pointer}
.link-card{display:block;padding:14px;background:var(--card);border:1px solid var(--border);border-radius:12px;margin:12px 0;font-weight:600}
.btn-outline{background:var(--card);border:2px solid var(--border);color:var(--text)}
.empty{text-align:center;padding:24px;color:var(--text-secondary)}
.bottom-nav{position:fixed;left:0;right:0;bottom:calc(var(--contact-footer-h) + var(--safe-area-bottom));height:var(--bottom-nav-h);display:grid;grid-template-columns:repeat(4,1fr);background:var(--card);border-top:1px solid var(--border);z-index:800;max-width:480px;margin:0 auto}
.bottom-nav button{display:flex;flex-direction:column;align-items:center;font-size:10px;color:var(--text-secondary);gap:2px;padding:6px 0;background:none;border:none;cursor:pointer}
.bottom-nav button.active{color:var(--primary);font-weight:700}
.share-main{padding:24px 16px}.share-card{background:var(--card);border-radius:20px;padding:28px;text-align:center}
.share-icon{font-size:56px;margin-bottom:8px}
.toast-container{position:fixed;left:50%;transform:translateX(-50%);bottom:120px;z-index:99999}
.toast-item{background:rgba(0,0,0,.85);color:#fff;padding:10px 18px;border-radius:20px;font-size:13px}
.contact-footer{position:fixed;left:0;right:0;bottom:0;background:#1a1a1a;z-index:850;padding:.55rem .75rem calc(.55rem + var(--safe-area-bottom));min-height:var(--contact-footer-h)}
.contact-footer__btns{display:grid;grid-template-columns:repeat(3,minmax(0,88px));justify-content:center;gap:.4rem;max-width:320px;margin:0 auto}
.contact-footer__cta,.contact-footer__btn{display:flex;align-items:center;justify-content:center;padding:.48rem .2rem;border-radius:6px;font-size:.72rem;min-height:32px}
.contact-footer__cta{background:#c41e1e!important;color:#fff!important;font-weight:700}
.contact-footer__btn{border:1px solid rgba(255,255,255,.35);color:#fff;background:transparent;font-family:inherit}
.contact-footer__brand{text-align:center;font-size:.62rem;color:rgba(255,255,255,.5);margin:.4rem 0 0}
body[data-brand="math-drill"] .zw-root .zw-fab,body[data-brand="math-drill"] .em-entry-btn{bottom:calc(var(--bottom-chrome-h) + var(--float-gap) + var(--safe-area-bottom))!important}
.hidden{display:none!important}