body {
    background: linear-gradient(135deg, #000000 0%, #100d0d 50%, #0d0f11 100%);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

.progress-bar {
    transition: width 0.3s ease;
}

.option-card {
    transition: all 0.3s ease;
    background: rgba(55, 65, 81, 0.5);
    backdrop-filter: blur(10px);
    border: 2px solid transparent;
}

.option-card:hover {
    background: rgba(75, 85, 99, 0.6);
    transform: translateY(-2px);
}

.option-card.selected {
    border-color: #6366f1;
    background: rgba(99, 102, 241, 0.2);
}

.next-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    transition: all 0.3s ease;
}

.next-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

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

.bmi-chart {
    background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
}

.chart-section {
    background: rgba(31, 41, 55, 0.8);
    backdrop-filter: blur(10px);
}

.plan-card {
    background: rgba(31, 41, 55, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(75, 85, 99, 0.3);
}

.disabled-next {
    cursor: none;
    pointer-events: none;
    opacity: 50%;
}

/* Chrome, Safari, Edge, Opera */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Firefox */
input[type=number] {
    -moz-appearance: textfield;
}

.gradient-text {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-content h1 {
    color: #6366f1;
    font-weight: 700;
    margin: 1.5rem 0 1rem 0;
    font-size: 2rem;
}

.article-content h2 {
    color: #6366f1;
    font-weight: 700;
    margin: 1.5rem 0 1rem 0;
    font-size: 1.6rem;
}

.article-content h3 {
    color: #8b5cf6;
    font-weight: 600;
    margin: 1.25rem 0 0.75rem 0;
    font-size: 1.2rem;
}

.article-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.article-content ul, .article-content ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.article-separator {
    border-top: 2px solid #374151;
    margin: 3rem 0;
}

article {
    margin: 0 auto;
    padding: 40px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.intro-text {
    font-size: 1.2rem;
    color: #b0b0b0;
    font-style: italic;
    margin-bottom: 40px;
    padding: 20px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.price-highlight {
    background: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
    color: #000;
    padding: 2px 8px;
    border-radius: 5px;
    font-weight: 600;
}

.glass-effect {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}