:root {
    --primary-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
}

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 40px;
    font-size: 2rem;
    font-weight: 700;
}

h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.25rem;
    font-weight: 600;
}

.input-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.input-group {
    background: var(--bg-color);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.control {
    margin-bottom: 24px;
}

.control:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.input-combo {
    display: flex;
    gap: 12px;
    align-items: center;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow);
}

input[type="number"] {
    width: 80px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--card-bg);
    color: var(--text-primary);
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.results {
    background: var(--bg-color);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.result-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.recommendation {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    border-radius: 12px;
    margin-top: 20px;
}

.recommendation.increase {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--danger-color);
}

.recommendation.decrease {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--success-color);
}

.recommendation.neutral {
    background: rgba(59, 130, 246, 0.1);
    border: 2px solid var(--primary-color);
}

.recommendation-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.recommendation-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.graph-container {
    background: var(--bg-color);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

#humidity-graph {
    width: 100%;
    height: auto;
    margin-bottom: 16px;
}

.graph-legend {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.about-author {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-top: 40px;
    text-align: center;
}

.about-author h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 1rem;
    font-weight: 600;
}

.about-author p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

.about-author a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.about-author a:hover {
    color: #2563eb;
    text-decoration: underline;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .container {
        padding: 24px;
    }

    h1 {
        font-size: 1.5rem;
        margin-bottom: 24px;
    }

    .input-section {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

    .input-combo {
        flex-direction: column;
        align-items: stretch;
    }

    input[type="number"] {
        width: 100%;
    }

    .recommendation {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 16px;
    }

    .input-group,
    .results,
    .graph-container {
        padding: 16px;
    }
}