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#6c5ce799;background:linear-gradient(135deg,#8e44ad,#6c5ce7);color:#fff}.btn-back-course:after{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:.5s}.btn-back-course:hover:after{left:100%}.dark-exam-mode{background-color:#0b0e14!important;color:#f0f6fc!important;min-height:100vh!important;margin-top:-24px;padding-top:40px!important}.dark-exam-mode .question-box{background:#161b22!important;border:1px solid #30363d!important;box-shadow:0 10px 30px #0006!important;color:#f0f6fc!important;border-radius:20px!important}.dark-exam-mode .option-item{background:#0d1117!important;border:1.5px solid #30363d!important;color:#c9d1d9!important;transition:.3s all ease}.dark-exam-mode .option-item:hover{background:#1f2937!important;border-color:#58a6ff!important}.dark-exam-mode .option-item.selected{background:rgba(108,92,231,.2)!important;border-color:#6c5ce7!important;color:#a29bfe!important}.dark-exam-mode .option-item .text-muted{color:#8b949e!important}.exam-timer-dark{background:linear-gradient(135deg,#4834d4,#686de0)!important;color:#fff!important;border:none!important}.btn-submit-dark{background:linear-gradient(135deg,#00b894,#00cec9)!important;color:#fff!important;border:none!important;font-size:1.1rem;font-weight:800!important;text-transform:uppercase;letter-spacing:1px}.dark-exam-mode .katex{color:#fff!important}