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

:root {
    --primary-color: #3b82f6;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-light: #334155;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    
    /* Species colors */
    --ch4-color: #3b82f6;
    --co-color: #f59e0b;
    --co2-color: #10b981;
    --oh-color: #ec4899;
    --o3-color: #8b5cf6;
    --no-color: #ef4444;
    --no2-color: #f97316;
    --ho2-color: #06b6d4;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a2847 100%);
    color: var(--text-primary);
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 10px;
}

@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
        padding: 0;
    }
}

@media (min-width: 1800px) {
    .container {
        max-width: 1800px;
    }
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Layout */
.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

@media (min-width: 1200px) {
    .main-layout {
        grid-template-columns: 1.2fr 1fr;
    }
}

@media (min-width: 1600px) {
    .main-layout {
        grid-template-columns: 1.5fr 1fr 400px;
    }
}

.panel {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.panel h2 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.panel h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

/* Chart Panel */
.chart-panel {
    min-height: 400px;
}

@media (min-width: 1200px) {
    .chart-panel {
        min-height: 500px;
    }
}

.chart-controls {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.chart-controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
}

.chart-controls input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

#concentrationChart {
    max-height: 400px;
}

.species-legend {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.concentration-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.species-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-light);
    border-radius: 6px;
    border-left: 4px solid;
}

.species-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.species-value {
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
}

/* Network Panel */
.network-panel {
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

@media (min-width: 1200px) {
    .network-panel {
        min-height: 500px;
    }
}

.network-controls {
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.network-controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
}

#networkCanvas {
    flex: 1;
    min-height: 350px;
    background: #0a0f1a;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.key-reactions {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

#reactionList {
    max-height: 200px;
    overflow-y: auto;
    font-size: 0.85rem;
}

.reaction-item {
    padding: 6px 10px;
    margin-bottom: 5px;
    background: var(--bg-light);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.reaction-equation {
    flex: 1;
}

.reaction-rate {
    color: var(--warning-color);
    font-weight: 600;
    margin-left: 10px;
}

/* Control Panel */
.control-panel {
    max-height: none;
    overflow-y: visible;
}

@media (min-width: 1600px) {
    .control-panel {
        max-height: 900px;
        overflow-y: auto;
    }
}

.control-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.control-section:last-child {
    border-bottom: none;
}

.time-display {
    background: var(--bg-light);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.time-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.time-info span:first-child {
    color: var(--text-secondary);
}

.sun-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    font-size: 1.1rem;
}

#sunIcon {
    font-size: 1.5rem;
}

#sunStatus {
    color: var(--warning-color);
    font-weight: 600;
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 15px;
}

.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    grid-column: 1 / -1;
}

.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #7c3aed;
    transform: translateY(-2px);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn-small {
    padding: 8px 12px;
    font-size: 0.85rem;
    background: var(--bg-light);
    color: var(--text-primary);
    margin-bottom: 5px;
    width: 100%;
}

.btn-small:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

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

.control-group {
    margin-bottom: 15px;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.value {
    color: var(--primary-color);
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--secondary-color);
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Info Panel */
.info-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

@media (min-width: 768px) {
    .info-panel {
        grid-template-columns: 1fr 1fr;
    }
}

.info-section {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.info-section h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.info-section p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.info-section ul {
    list-style: none;
    padding-left: 0;
}

.info-section li {
    color: var(--text-secondary);
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.info-section li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.info-section strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer p {
    margin: 5px 0;
}

/* Scrollbar */
.control-panel::-webkit-scrollbar,
#reactionList::-webkit-scrollbar {
    width: 8px;
}

.control-panel::-webkit-scrollbar-track,
#reactionList::-webkit-scrollbar-track {
    background: var(--bg-light);
    border-radius: 4px;
}

.control-panel::-webkit-scrollbar-thumb,
#reactionList::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.control-panel::-webkit-scrollbar-thumb:hover,
#reactionList::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1200px) {
    h1 {
        font-size: 2rem;
    }
    
    .panel {
        padding: 15px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .panel {
        padding: 12px;
    }
    
    .concentration-values {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
}