:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --border-color: #334155;
    --success-color: #4ade80;
    --warning-color: #facc15;
    --danger-color: #f87171;
    --font-family: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.08), transparent 40%),
        radial-gradient(circle at 85% 20%, rgba(129, 140, 248, 0.08), transparent 45%),
        radial-gradient(circle at 50% 90%, rgba(248, 250, 252, 0.04), transparent 55%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.app-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    letter-spacing: 0.02em;
    padding-bottom: 0.5rem;
}

header {
    text-align: center;
}

header h1 {
    font-weight: 600;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, var(--accent-color), #818cf8);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
}

.upload-section {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.custom-file-upload {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.custom-file-upload:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

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

.workspace {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    align-items: start;
}

.canvas-container {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

#overlay-layer {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text-primary);
    background: rgba(15, 23, 42, 0.8);
    border: 2px dashed rgba(56, 189, 248, 0.6);
    border-radius: 0.75rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    text-transform: uppercase;
}

.canvas-container.empty #overlay-layer,
.canvas-container.drag-over #overlay-layer {
    opacity: 1;
}

.canvas-container.empty canvas {
    opacity: 0.2;
}

.canvas-container.drag-over canvas {
    opacity: 0.35;
}

.magnifier {
    position: absolute;
    width: 100px;
    height: 100px;
    border: 2px solid var(--accent-color);
    border-radius: 50%;
    pointer-events: none;
    /* Let clicks pass through */
    display: none;
    z-index: 10;
    background-repeat: no-repeat;
    background-color: var(--card-bg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    cursor: none;
}

.magnifier.active {
    display: block;
}

/* Crosshair inside magnifier */
.magnifier::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 10px;
    height: 10px;
    border: 1px solid rgba(255, 0, 0, 0.8);
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background-color: rgba(255, 0, 0, 0.2);
}

canvas {
    max-width: 100%;
    max-height: 70vh;
    cursor: none;
    /* Hide default cursor to use magnifier as cursor */
    border-radius: 0.5rem;
}

.results-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.color-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.2s ease;
}

.color-card.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.color-preview {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background-color: transparent;
    /* Default */
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.color-info h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.color-value {
    font-family: monospace;
    font-size: 1.1rem;
    font-weight: 600;
}

.contrast-result {
    background: linear-gradient(135deg, var(--card-bg), #253045);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.ratio-display {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#contrast-ratio {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.5rem;
    background: linear-gradient(to bottom, #fff, #cbd5e1);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.rating {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    background-color: var(--border-color);
    color: var(--text-secondary);
}

.badge.pass {
    background-color: rgba(74, 222, 128, 0.2);
    color: var(--success-color);
    border: 1px solid rgba(74, 222, 128, 0.3);
}

.badge.fail {
    background-color: rgba(248, 113, 113, 0.2);
    color: var(--danger-color);
    border: 1px solid rgba(248, 113, 113, 0.3);
}

@media (max-width: 900px) {
    .workspace {
        grid-template-columns: 1fr;
    }

    .results-panel {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .color-card,
    .contrast-result {
        flex: 1;
        min-width: 250px;
    }
}