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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.tab-nav {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 0.5rem;
    border: 1px solid rgba(255,255,255,0.2);
}

.tab-btn {
    background: transparent;
    border: none;
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.1);
}

.tab-btn.active {
    background: white;
    color: #333;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

main {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.2);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-section {
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    max-width: 300px;
    margin: 0 auto;
}

.input-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #555;
}

.input-group input {
    padding: 0.75rem 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
    background: white;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.result-card {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
}

.result-card.highlight {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-color: #f59e0b;
}

.result-card.primary {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    border-color: #3b82f6;
}

.result-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: #64748b;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #1e293b;
}

.result-card.highlight .result-value {
    color: #92400e;
}

.result-card.primary .result-value {
    color: #1e40af;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.setting-group {
    display: flex;
    flex-direction: column;
}

.setting-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #374151;
}

.setting-group input {
    padding: 0.75rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.setting-group input:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.setting-group small {
    margin-top: 0.25rem;
    color: #6b7280;
    font-size: 0.85rem;
}

.settings-actions {
    text-align: center;
}

.btn-secondary {
    background: #f3f4f6;
    color: #374151;
    border: 2px solid #d1d5db;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: #e5e7eb;
    border-color: #9ca3af;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .tab-nav {
        flex-direction: column;
        width: 100%;
    }

    .tab-btn {
        width: 100%;
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}