:root {
    --space-dark: #020205;
    --moon-light: #e0e0e0;
    --glow-blue: #00d2ff;
    --glow-purple: #9d50bb;
    --accent: #ff4d4d;
    --panel-bg: rgba(20, 20, 30, 0.85);
    --border-color: rgba(0, 210, 255, 0.3);
}

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

body {
    background: var(--space-dark);
    color: var(--moon-light);
    font-family: 'Roboto', sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Stars and Twinkling */
.stars, .twinkling {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.stars {
    background: #000 url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/123163/stars.png') repeat top center;
}

.twinkling {
    background: transparent url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/123163/twinkling.png') repeat top center;
    animation: move-twink-back 200s linear infinite;
}

@keyframes move-twink-back {
    from { background-position: 0 0; }
    to { background-position: -10000px 5000px; }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 1.5s ease-out;
}

header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 3.5rem;
    letter-spacing: 0.5rem;
    background: linear-gradient(to right, #00d2ff, #9d50bb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(0, 210, 255, 0.5);
}

header .subtitle {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    color: var(--glow-blue);
    margin-top: 0.5rem;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
}

main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Panel Styles */
.control-panel, .results-panel {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    animation: fadeInUp 1s ease-out;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.panel-header h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    color: var(--glow-blue);
}



/* Grid Layouts */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    height: 100%;
}

.input-group input {
    margin-top: auto;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--glow-blue);
    text-transform: uppercase;
    font-weight: 700;
}

.input-group .disclaimer {
    font-size: 0.85rem;
    color: var(--light);
    text-transform: uppercase;
    font-weight: 500;
}

input, textarea {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 0.8rem;
    border-radius: 4px;
    transition: 0.3s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--glow-blue);
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.3);
}

.data-section, .params-section {
    margin-top: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.input-mode-switch {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    font-family: 'Orbitron', sans-serif;
    color: var(--glow-blue);
}



/* Toggle Switch Style */
.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider.round {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #333;
    transition: .4s;
    border-radius: 34px;
}

.slider.round:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider.round {
    background-color: var(--glow-blue);
}

input:checked + .slider.round:before {
    transform: translateX(20px);
}

/* Simulation Buttons */
.button-group {
    display: flex;
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.button-group.secondary {
    margin-bottom: 2rem;
    gap: 1rem;
}

.button-group.secondary .json-btn {
    flex: 0 1 280px;
}

.json-btn {
    flex: 1;
    padding: 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--glow-blue);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    cursor: pointer;
    transition: 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.json-btn:hover {
    background: rgba(0, 210, 255, 0.1);
    border-color: var(--glow-blue);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.2);
}

.upload-label {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: rgba(0, 210, 255, 0.1);
    border: 1px dashed var(--glow-blue);
    border-radius: 4px;
    cursor: pointer;
    transition: 0.3s;
    text-align: center;
    margin-bottom: 1rem;
}

.upload-label:hover {
    background: rgba(0, 210, 255, 0.2);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.2);
}

.upload-label .icon {
    margin-right: 8px;
}

.data-section h3, .params-section h3 {
    margin-bottom: 1.5rem;
    color: var(--glow-purple);
    font-family: 'Orbitron', sans-serif;
}

.params-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.param-row {
    display: grid;
    grid-template-columns: 140px 1fr 1fr 1fr 1fr;
    gap: 1rem;
    align-items: center;
}

.param-name {
    font-weight: 700;
    color: var(--moon-light);
}

.results-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.view-toggle {
    align-self: center;
    display: inline-flex;
    gap: 0.25rem;
    padding: 0.25rem;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
}

.view-toggle-btn {
    min-width: 130px;
    padding: 0.7rem 1.1rem;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--moon-light);
    cursor: pointer;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.view-toggle-btn.active {
    background: var(--glow-blue);
    color: #001018;
    box-shadow: 0 0 16px rgba(0, 210, 255, 0.28);
}

#runBtn, #runBtnPython {
    flex: 1;
    padding: 1.2rem;
    background: linear-gradient(45deg, var(--glow-blue), var(--glow-purple));
    border: none;
    border-radius: 4px;
    color: white;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: 0.4s;
    letter-spacing: 0.1rem;
}

#runBtnPython.beta-btn {
    background: linear-gradient(45deg, #444, #222);
    border: 1px solid var(--glow-purple);
}

#runBtn:hover, #runBtnPython:hover {
    box-shadow: 0 0 30px rgba(0, 210, 255, 0.4);
    transform: translateY(-2px);
}

#runBtnPython:hover {
    border-color: var(--glow-blue);
    box-shadow: 0 0 30px rgba(157, 80, 187, 0.4);
}

/* Results Content */
.results-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.chart-container {
    background: rgba(0, 0, 0, 0.5);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
}

.chart-container h3 {
    margin-bottom: 1rem;
    color: var(--glow-purple);
    font-family: 'Orbitron', sans-serif;
}

.chart-container--interactive {
    text-align: left;
}

.chart-container--interactive canvas {
    width: 100% !important;
    height: clamp(460px, 58vh, 680px) !important;
    display: block;
}

.chart-container img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.details-container pre {
    background: rgba(0, 0, 0, 0.4);
    padding: 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    overflow-x: auto;
    margin-top: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.best-value-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 4px;
    border-left: 3px solid var(--glow-purple);
}

.best-value-label {
    display: block;
    font-size: 0.7rem;
    color: var(--glow-blue);
    text-transform: uppercase;
}

.best-value-data {
    font-size: 1.1rem;
    font-weight: 700;
}

.study-input {
    width: 100%;
    transition: all 0.3s ease;
}

.hidden {
    display: none !important;
}

.study-input.hidden {
    display: none !important;
}


.loader {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

.moon {
    width: 100px;
    height: 100px;
    background: var(--moon-light);
    border-radius: 50%;
    box-shadow: inset -25px -25px 0 0 #c0c0c0, 0 0 40px rgba(255,255,255,0.3);
    position: relative;
    animation: rotate 10s linear infinite;
}

.footer {
    text-align: center;
    padding: 1.25rem 2rem 2rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.72rem;
    color: rgba(224, 224, 224, 0.5);
    letter-spacing: 1px;
}

.footer a {
    color: var(--glow-blue);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .param-row {
        grid-template-columns: 1fr 1fr;
    }
    .param-name { grid-column: span 2; }

    .results-actions {
        width: 100%;
        justify-content: stretch;
    }

    .results-actions .json-btn {
        flex: 1;
    }

    .view-toggle {
        align-self: stretch;
    }

    .view-toggle-btn {
        flex: 1;
        min-width: 0;
    }

    .chart-container--interactive canvas {
        height: 360px !important;
    }
}