* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 100vw;
    height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.test-container {
    width: 700px;
    max-width: 95vw;
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(30px);
    border-radius: 24px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5), 0 0 1px rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    animation: slideIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(30px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.header {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.9) 0%, rgba(168, 85, 247, 0.9) 100%);
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: #ffffff;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
}

.subtitle {
    font-size: 12px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 2px;
}

.timer {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 20px;
    border-radius: 12px;
    color: #ffffff;
    font-weight: 600;
    font-size: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.timer.warning {
    background: rgba(239, 68, 68, 0.3);
    border: 1px solid rgba(239, 68, 68, 0.5);
    animation: warningPulse 1s ease-in-out infinite;
}

@keyframes warningPulse {
    0%, 100% { 
        transform: scale(1);
        box-shadow: 0 4px 16px rgba(239, 68, 68, 0.4);
    }
    50% { 
        transform: scale(1.08);
        box-shadow: 0 6px 24px rgba(239, 68, 68, 0.6);
    }
}

.question-container {
    padding: 32px;
}

.question-header {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.question-number {
    font-size: 14px;
    font-weight: 600;
    color: rgba(196, 181, 253, 1);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.8) 0%, rgba(168, 85, 247, 0.8) 100%);
    border-radius: 3px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.question-text {
    font-size: 20px;
    font-weight: 600;
    color: #f3f4f6;
    line-height: 1.6;
    margin-bottom: 28px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.answers {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.answer-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: rgba(31, 41, 55, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
}

.answer-btn:hover {
    background: rgba(31, 41, 55, 0.8);
    border-color: rgba(99, 102, 241, 0.5);
    transform: translateX(8px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.answer-btn.selected {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.4) 0%, rgba(168, 85, 247, 0.4) 100%);
    border-color: rgba(99, 102, 241, 0.6);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.answer-label {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.3);
    border-radius: 8px;
    color: #ffffff;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
}

.answer-btn.selected .answer-label {
    background: rgba(99, 102, 241, 0.8);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.answer-text {
    flex: 1;
    color: #f3f4f6;
    font-size: 15px;
    font-weight: 500;
}

.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 32px;
    background: rgba(31, 41, 55, 0.6);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(99, 102, 241, 0.2);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 10px;
    color: #ffffff;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover:not(:disabled) {
    background: rgba(99, 102, 241, 0.4);
    border-color: rgba(99, 102, 241, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.answered-count {
    color: rgba(196, 181, 253, 1);
    font-size: 14px;
    font-weight: 600;
}

.submit-section {
    padding: 20px 32px;
    background: rgba(31, 41, 55, 0.4);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: center;
}

.submit-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 40px;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.8) 0%, rgba(16, 185, 129, 0.8) 100%);
    border: 1px solid rgba(34, 197, 94, 0.5);
    border-radius: 12px;
    color: #ffffff;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.3);
}

.submit-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 24px rgba(34, 197, 94, 0.5);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}