:root {
    --primary-color: #3B82F6;
    --secondary-color: #10B981;
    --accent-color: #8B5CF6;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --bg-color: #F9FAFB;
    --card-bg: #FFFFFF;
    --border-color: #E5E7EB;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(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: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.coriolis-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: var(--shadow-md);
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

.visualization-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (max-width: 1024px) {
    .visualization-layout {
        grid-template-columns: 1fr;
    }
}

.earth-panel,
.analysis-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.earth-display,
.trajectory-display,
.foucault-display,
.atmosphere-display {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow-md);
}

.earth-display h3,
.trajectory-display h3,
.foucault-display h3,
.atmosphere-display h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    font-weight: 600;
}

canvas {
    width: 100%;
    border-radius: 8px;
    background: linear-gradient(180deg, #0EA5E9 0%, #0369A1 100%);
}

#earthCanvas {
    height: 350px;
}

#trajectoryCanvas {
    height: 280px;
}

#foucaultCanvas {
    height: 250px;
}

#atmosphereCanvas {
    height: 250px;
}

.earth-info,
.trajectory-legend,
.foucault-info,
.atmosphere-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
    padding: 15px;
    background: var(--bg-color);
    border-radius: 8px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.info-item span:first-child {
    font-weight: 600;
    color: var(--text-primary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.legend-line {
    width: 30px;
    height: 3px;
    border-radius: 2px;
}

.legend-line.inertial {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.legend-line.rotating {
    background: var(--danger-color);
    border-style: dashed;
}

.legend-cyclone,
.legend-anticyclone {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    position: relative;
}

.legend-cyclone {
    background: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.legend-cyclone::after {
    content: '↺';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
}

.legend-anticyclone {
    background: var(--warning-color);
    border: 2px solid var(--warning-color);
}

.legend-anticyclone::after {
    content: '↻';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
}

.controls-panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
}

.controls-panel h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 600;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 25px;
}

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

.control-group h4 {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: background 0.2s;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-color);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.control-group select {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: white;
    cursor: pointer;
    transition: border-color 0.2s;
}

.control-group select:hover,
.control-group select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.checkbox-input {
    width: auto !important;
    margin-right: 8px;
    cursor: pointer;
}

.preset-btn {
    padding: 10px 15px;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.preset-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 25px;
}

.control-button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.control-button.start {
    background: var(--secondary-color);
    color: white;
}

.control-button.start:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.control-button.pause {
    background: var(--warning-color);
    color: white;
}

.control-button.pause:hover {
    background: #D97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.control-button.reset {
    background: var(--text-secondary);
    color: white;
}

.control-button.reset:hover {
    background: #4B5563;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.control-button.launch {
    background: var(--accent-color);
    color: white;
}

.control-button.launch:hover {
    background: #7C3AED;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.formulas-section {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
}

.formulas-section h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    font-weight: 600;
}

.formula-list {
    display: grid;
    gap: 12px;
}

.formula-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 12px;
    background: white;
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
}

.formula-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.formula {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-color);
    padding: 8px 12px;
    border-radius: 4px;
}

.explanation {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    margin-top: 30px;
}

.explanation h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 700;
}

.explanation h3 {
    font-size: 1.3rem;
    margin-top: 25px;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-weight: 600;
}

.explanation p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.explanation strong {
    color: var(--text-primary);
    font-weight: 600;
}

@media (max-width: 768px) {
    .coriolis-container {
        padding: 10px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

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

    .button-group {
        flex-direction: column;
    }

    .control-button {
        width: 100%;
    }

    .explanation {
        padding: 20px;
    }

    .explanation h2 {
        font-size: 1.4rem;
    }

    .explanation h3 {
        font-size: 1.1rem;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #111827;
        --card-bg: #1F2937;
        --border-color: #374151;
        --text-primary: #F9FAFB;
        --text-secondary: #D1D5DB;
    }

    .formula-item {
        background: var(--card-bg);
        border-left-color: var(--primary-color);
    }

    .formula {
        background: var(--bg-color);
    }
}