:root {
    --bg-color: #05070a;
    --panel-bg: rgba(20, 25, 35, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f0f4f8;
    --text-secondary: #94a3b8;
    --accent-color: #4cc9f0;
    --accent-glow: rgba(76, 201, 240, 0.4);
    --photon-color: #ffd700;
    --photon-glow: rgba(255, 215, 0, 0.6);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.simulation-canvas-container {
    flex: 1;
    position: relative;
    background: radial-gradient(circle at center, #0a0f1a 0%, #05070a 100%);
}

#simulationCanvas {
    width: 100%;
    height: 100%;
}

.info-overlay {
    position: absolute;
    top: 2rem;
    left: 2rem;
    display: flex;
    gap: 1.5rem;
}

.stat-card {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    min-width: 160px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.stat-card .label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-card .value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-color);
}

.stat-card .unit {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.control-panel {
    width: 380px;
    background: var(--panel-bg);
    backdrop-filter: blur(24px);
    border-left: 1px solid var(--glass-border);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    z-index: 10;
}

.main-header {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.brand-box {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.25rem;
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.brand-box h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, var(--accent-color), var(--photon-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-box .tagline {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.author {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding-left: 0.25rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.control-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.control-header label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-color);
    font-weight: bold;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: transform 0.1s ease;
}

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

.ticks {
    display: flex;
    justify-content: space-between;
    padding: 0 2px;
}

.ticks span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.physics-note {
    margin-top: 1rem;
    background: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.physics-note svg {
    flex-shrink: 0;
    color: var(--accent-color);
    width: 24px;
    height: 24px;
}

.physics-note p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.visual-feedback {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
    gap: 1rem;
}

.ammeter-container,
.lightbulb-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

.ammeter {
    width: 80px;
    height: 50px;
    color: var(--text-secondary);
}

#ammeterNeedle {
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-origin: 50px 50px;
}

.lightning-group {
    opacity: 0;
    pointer-events: none;
    filter: drop-shadow(0 0 4px #4cc9f0);
    transition: opacity 0.2s ease;
}

.lightning-group.active {
    opacity: 1;
    animation: lightning-flicker 0.15s infinite;
}

.ammeter-spark {
    fill: var(--accent-color);
    filter: drop-shadow(0 0 4px var(--accent-color)) drop-shadow(0 0 8px var(--photon-color));
}

@keyframes lightning-flicker {
    0% {
        opacity: 0.4;
        transform: scale(1) translate(0, 0);
    }

    20% {
        opacity: 1;
        transform: scale(1.05) translate(1px, -1px);
    }

    40% {
        opacity: 0.6;
        transform: scale(0.95) translate(-1px, 1px);
    }

    60% {
        opacity: 1;
        transform: scale(1.1) translate(0.5px, 0.5px);
    }

    80% {
        opacity: 0.5;
        transform: scale(1) translate(-0.5px, -0.5px);
    }

    100% {
        opacity: 0.8;
        transform: scale(1.05) translate(0, 0);
    }
}

.lightbulb {
    position: relative;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.lightbulb svg {
    width: 32px;
    height: 32px;
    z-index: 2;
}

.bulb-glow {
    position: absolute;
    width: 32px;
    height: 32px;
    background: var(--photon-color);
    border-radius: 50%;
    filter: blur(15px);
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 1;
}

.lightbulb-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    white-space: nowrap;
}

.equation-display {
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.equation-display sub {
    font-size: 0.7rem;
}

.phi {
    font-style: italic;
    color: var(--photon-color);
    font-weight: bold;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 7, 10, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(24px);
    padding: 3rem;
    border-radius: 1.5rem;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.modal-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-color), var(--photon-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: -0.5rem;
}

.modal-content h3 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.modal-descriptor {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin: 1rem 0;
}

.modal-author {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#startButton {
    background: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 0.75rem 3rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 1rem;
    box-shadow: 0 0 20px var(--accent-glow);
}

#startButton:hover {
    transform: scale(1.05);
    background: #fff;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.4);
}

.help-btn {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.help-btn:hover {
    background: var(--accent-color);
    color: var(--bg-color);
    transform: scale(1.1);
    box-shadow: 0 0 15px var(--accent-glow);
}