:root {
    --primary-color: #6200ee;
    --primary-variant-color: #3700b3;
    --secondary-color: #03dac6;
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --on-primary-color: #ffffff;
    --on-surface-color: #e1e1e1;
    --on-background-color: #e1e1e1;
    --error-color: #cf6679;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--on-background-color);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    width: 100%;
    background-color: var(--surface-color);
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    z-index: 10;
}

.main-container {
    display: flex;
    flex-grow: 1;
    width: 100%;
}

main {
    flex-grow: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.controls-card {
    background-color: var(--surface-color);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 800px;
    box-sizing: border-box;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    justify-content: center;
}

.button, button {
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.25px;
    transition: background-color 0.3s ease;
}

.button:hover, button:hover {
    background-color: var(--primary-variant-color);
}

input[type="file"] {
    display: none;
}

.canvas-container {
    width: 100%;
    max-width: 800px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--surface-color);
    border-radius: 8px;
    padding: 1rem;
    box-sizing: border-box;
}

canvas {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.results-panel {
    width: 320px;
    background-color: var(--background-color);
    padding: 1.5rem;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.results-panel h2 {
    text-align: center;
    margin-top: 0;
    color: var(--on-background-color);
    border-bottom: 1px solid var(--surface-color);
    padding-bottom: 0.5rem;
}

#results .result-card,
#grade-result .result-card {
    background-color: var(--surface-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

#results .result-card p {
    margin: 0;
    font-size: 1.1rem;
    color: var(--on-surface-color);
}

#results .result-card .label {
    font-weight: 500;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    display: block;
}

#grade-result .result-card {
    background-color: var(--primary-color);
}

#grade-result .label {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--on-primary-color);
    opacity: 0.8;
}

#grade-result .grade {
    font-size: 3rem;
    font-weight: 700;
    color: var(--on-primary-color);
}

/* Zoom Toggle Switch */
.zoom-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Responsive Design for Mobile */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }

    .results-panel {
        width: 100%;
        max-width: 800px; /* Match the canvas container width */
        margin: 0 auto; /* Center the panel */
        box-shadow: none; /* Remove side shadow, it will be on top */
    }

    main {
        padding-bottom: 0; /* Reduce bottom padding */
    }
}

/* Mobile Nudge Controls */
.mobile-controls-card {
    display: none; /* Hidden by default on all screen sizes */
    background-color: var(--surface-color);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
    width: 150px;
    height: 150px;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    gap: 5px;
    justify-items: center;
    align-items: center;
}

#nudge-up { grid-area: 1 / 2 / 2 / 3; }
#nudge-left { grid-area: 2 / 1 / 3 / 2; }
#nudge-right { grid-area: 2 / 3 / 3 / 4; }
#nudge-down { grid-area: 3 / 2 / 4 / 3; }
.mobile-controls-center { grid-area: 2 / 2 / 3 / 3; }

.mobile-controls-card button {
    width: 100%;
    height: 100%;
    font-size: 1.5rem;
}

@media (max-width: 768px) {
    .mobile-controls-card.visible {
        display: grid;
    }
}