.bg-soft{background:linear-gradient(120deg,#eef4ff,#f8fbff);min-height:100vh}.card{overflow:hidden}.form-control,.form-select{border-radius:14px;padding:12px}.btn{font-weight:600}.option-box{display:block;margin-top:12px;padding:14px;border:1px solid #dde5f3;border-radius:15px;background:#fff;cursor:pointer}.option-box:hover{background:#f4f8ff;border-color:#7aa7ff}.option-box input{margin-right:8px}.timer{background:#111827;color:#fff;padding:10px 18px;border-radius:30px;font-weight:700}

/* DoStudy Pro UI upgrade */
:root{--ds-primary:#002b41;--ds-primary2:#074b68;--ds-accent:#f5e6b3;--ds-bg:#f4f8fa;--ds-card:#fff;--ds-text:#18323e;--ds-border:#dfe8ed;--ds-shadow:0 12px 34px rgba(0,43,65,.10)}
body{background:var(--ds-bg);color:var(--ds-text);-webkit-font-smoothing:antialiased}.container,.exam-container,.card,.login-box,.register-box,.dashboard-box{max-width:1100px}.card,.login-box,.register-box,.dashboard-box,.exam-box,.result-box{background:var(--ds-card);border-radius:16px!important;box-shadow:var(--ds-shadow)!important;border:1px solid var(--ds-border)!important}.btn,button,input[type=submit]{background:var(--ds-primary)!important;border-color:var(--ds-primary)!important;border-radius:9px!important;transition:.2s ease}.btn:hover,button:hover,input[type=submit]:hover{background:var(--ds-primary2)!important;transform:translateY(-1px)}input,select,textarea{border-radius:9px!important;border:1px solid var(--ds-border)!important;min-height:44px}input:focus,select:focus,textarea:focus{outline:0;border-color:var(--ds-primary2)!important;box-shadow:0 0 0 3px rgba(0,43,65,.08)}.question-card,.question-box{border-radius:12px!important;border:1px solid var(--ds-border)!important;background:#fff}.option-label,.option{border-radius:9px!important}.progress,.progress-bar-wrap{border-radius:999px!important;overflow:hidden}.navbar,.topbar,.header{background:var(--ds-primary)!important}@media(max-width:767px){body{padding:10px}.container,.exam-container,.card,.login-box,.register-box,.dashboard-box{width:100%!important;margin:0 auto!important;padding-left:14px!important;padding-right:14px!important}.question-card,.question-box{padding:14px!important}.btn,button,input[type=submit]{width:100%;min-height:44px}.exam-actions{display:grid!important;gap:10px}.table-responsive{overflow-x:auto}}