.s4-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:12px 0}.s4-card{border:1px solid #dbe4f2;background:#fff;border-radius:18px;padding:14px;text-align:left;display:flex;gap:12px;align-items:center;cursor:pointer}.s4-card b{width:42px;height:42px;border-radius:14px;background:#eef4ff;display:grid;place-items:center;font-size:22px}.s4-card strong,.s4-card small{display:block}.s4-card small{color:#667085;margin-top:3px;line-height:1.3}.s4-list{display:grid;gap:10px}.s4-item{border:1px solid #e1e7ef;border-radius:16px;padding:14px;background:#fff}.s4-item h3{margin:0 0 6px;font-size:16px}.s4-item p{margin:4px 0;color:#667085}.s4-row{display:flex;align-items:center;justify-content:space-between;gap:10px}.s4-pill{display:inline-flex;padding:4px 8px;border-radius:999px;background:#eef4ff;color:#155eef;font-size:11px;font-weight:800}.s4-pill.live{background:#e8f8ee;color:#137333}.s4-pill.ended{background:#f2f4f7;color:#667085}.s4-form{display:grid;gap:10px}.s4-form input{width:100%;min-height:46px;border:1px solid #cfd8e6;border-radius:12px;padding:10px 12px}.s4-primary,.s4-secondary{border:0;border-radius:12px;min-height:44px;padding:10px 14px;font-weight:800;cursor:pointer}.s4-primary{background:#155eef;color:#fff}.s4-secondary{background:#eef4ff;color:#0d47c7}.s4-offline-q{font-size:18px;line-height:1.5;margin:12px 0}.s4-options{display:grid;gap:8px}.s4-option{border:1px solid #d7dfeb;border-radius:12px;padding:11px;background:#fff;text-align:left;cursor:pointer}.s4-option.selected{border:2px solid #155eef;background:#f3f7ff}.s4-option.correct{border-color:#55a96b;background:#ecf9ef}.s4-option.wrong{border-color:#d44;background:#fff0f0}.s4-question-image,.s4-option img{max-width:100%;height:auto;border-radius:10px;margin-top:8px}.s4-nav{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}.s4-result{text-align:center;padding:20px}.s4-result strong{font-size:44px;color:#155eef;display:block}.s4-note{background:#fff7df;border:1px solid #f0dd9b;border-radius:12px;padding:10px 12px;color:#6e5705;font-size:12px;line-height:1.45}.s4-rank{display:grid;gap:6px}.s4-rank>div{display:grid;grid-template-columns:44px 1fr auto;gap:8px;align-items:center;border-bottom:1px solid #eef1f5;padding:8px 0}.s4-rank small{display:block;color:#667085}.s4-injected{outline:1px solid rgba(21,94,239,.08)}
@media(max-width:560px){.s4-grid{grid-template-columns:1fr}.s4-row{align-items:flex-start;flex-direction:column}.s4-primary,.s4-secondary{width:100%}}

/* v1.19.3 Visual MAT: offline image safety + zoom */
.s4-question-image,.s4-option img{display:block;box-sizing:border-box;object-fit:contain;object-position:center;background:#fff;border:1px solid #e4e7ec;cursor:zoom-in}
.s4-question-image{width:min(100%,620px);max-height:min(52vh,420px);margin:10px auto 0;padding:5px}
.s4-option{min-width:0;overflow:visible}
.s4-option-line{display:flex;align-items:flex-start;gap:7px;min-width:0;overflow-wrap:anywhere}
.s4-option-line span{min-width:0;flex:1}
.s4-option img{width:min(100%,230px);max-height:180px;margin:8px auto 0;padding:3px}
.s4-visual-pop{position:fixed;inset:0;z-index:1000200;background:rgba(7,18,37,.88);display:grid;place-items:center;padding:8px;overscroll-behavior:contain}
.s4-visual-box{position:relative;width:min(96vw,820px);height:min(92vh,820px);display:grid;place-items:center;background:#fff;border-radius:18px;padding:44px 10px 10px;overflow:auto}
.s4-visual-box img{display:block;max-width:100%;max-height:calc(92vh - 64px);width:auto;height:auto;object-fit:contain}
.s4-visual-close{position:absolute;right:9px;top:8px;width:38px;height:38px;border:0;border-radius:50%;background:#eef2f7;color:#172033;font-size:26px;line-height:1}
@media(max-width:420px){
 .s4-item{padding:11px}
 .s4-offline-q{font-size:16px;line-height:1.55}
 .s4-question-image{width:100%;max-height:40vh;padding:2px}
 .s4-option{padding:10px;min-height:50px}
 .s4-option img{width:min(100%,195px);max-height:145px}
 .s4-nav{gap:6px;position:sticky;bottom:4px;background:rgba(255,255,255,.96);padding:6px;border-radius:12px}
 .s4-nav .s4-primary,.s4-nav .s4-secondary{min-height:46px;padding:9px 5px}
 .s4-visual-box{width:calc(100vw - 10px);height:calc(100vh - 18px);border-radius:15px}
 .s4-visual-box img{max-height:calc(100vh - 76px)}
}

/* v1.21 Teacher & Growth: explicit class progress consent */
.s4-consent{display:flex;align-items:flex-start;gap:10px;padding:12px;border:1px solid #d8e3f5;background:#f7faff;border-radius:14px;color:#344054;font-size:12px;line-height:1.5}
.s4-consent input{width:19px!important;height:19px!important;min-height:auto!important;flex:0 0 auto;margin-top:1px}
.s4-consent span{display:block}.s4-consent strong{display:block;color:#172033;margin-bottom:2px}
.s4-consent-card{margin-top:10px;padding:13px;border:1px solid #f0d59a;background:#fff9e8;border-radius:14px}.s4-consent-card strong{display:block;color:#6f4b00;margin-bottom:4px}.s4-consent-card p{margin:0 0 9px;color:#6d5b32;font-size:12px;line-height:1.45}

/* v1.5.0 shared teacher assignments */
.s4-paper-chip{display:inline-flex;border-radius:999px;padding:3px 7px;background:#eef4ff;color:#155eef;font-size:9px;font-weight:900}.s4-shared-assignment{border-color:#7a3ff2!important;box-shadow:0 0 0 3px rgba(122,63,242,.10)}