:root {
    --brand: #064681;
    --bg: #f8fafc;
    --text: #334155;
    --border: #e2e8f0;
}
body {
    font-family: Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}
.github-credit {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 5;
    font-size: 0.85rem;
    color: #0f172a;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid #e2e8f0;
    padding: 6px 10px;
    border-radius: 999px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.github-credit:hover {
    text-decoration: underline;
}
@media (max-width: 640px) {
    .github-credit {
        top: 12px;
        right: 12px;
        font-size: 0.8rem;
    }
}
.container {
    width: 100%;
    max-width: 600px;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    text-align: center;
    position: relative;
}
h1 {
    color: var(--brand);
    margin-top: 0;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}
p.subtitle {
    font-size: 0.9rem;
    color: #64748b;
    margin-bottom: 2rem;
}
.drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    padding: 3rem 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
    background: #f1f5f9;
}
.drop-zone.drag-over {
    border-color: var(--brand);
    background: #eff6ff;
    transform: scale(1.02);
}
.drop-zone p {
    margin: 0;
    pointer-events: none;
    color: #64748b;
}
.drop-zone kbd {
    background: white;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #cbd5e1;
    font-family: Consolas, monospace;
    font-size: 0.8em;
}
.result-area {
    display: none;
    margin-top: 2rem;
    animation: fadeIn 0.3s ease-in-out;
}
.preview-wrapper {
    background-image: 
        linear-gradient(45deg, #eee 25%, transparent 25%), 
        linear-gradient(-45deg, #eee 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #eee 75%), 
        linear-gradient(-45deg, transparent 75%, #eee 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
}
canvas {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}
.crop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    overflow: hidden;
}
.crop-rect {
    position: absolute;
    border: 2px solid currentColor;
    color: #0f172a;
    border-radius: 6px;
    box-shadow: 0 0 0 9999px rgba(15, 23, 42, 0.25);
    pointer-events: none;
}
.crop-handle {
    position: absolute;
    background: rgba(15, 23, 42, 0.5);
    pointer-events: auto;
    touch-action: none;
}
.crop-handle.top,
.crop-handle.bottom {
    left: -6px;
    right: -6px;
    height: 10px;
    cursor: ns-resize;
}
.crop-handle.top { top: -6px; }
.crop-handle.bottom { bottom: -6px; }
.crop-handle.left,
.crop-handle.right {
    top: -6px;
    bottom: -6px;
    width: 10px;
    cursor: ew-resize;
}
.crop-handle.left { left: -6px; }
.crop-handle.right { right: -6px; }
.actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}
button {
    background-color: var(--brand);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
}
button:hover {
    filter: brightness(110%);
}
button.secondary {
    background-color: white;
    color: var(--brand);
    border: 1px solid var(--brand);
}
button.secondary:hover {
    background-color: #f0f7ff;
}
#toast {
    visibility: hidden;
    min-width: 250px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 8px;
    padding: 12px;
    position: fixed;
    z-index: 999;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
#toast.show {
    visibility: visible;
    opacity: 1;
}
#toast.error {
    background-color: #dc2626;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.icon { width: 18px; height: 18px; fill: currentColor; }
.switch-wrapper {
    position: absolute;
    top: 18px;
    right: 18px;
    z-index: 2;
    margin: 0;
    display: block;
}
.switch {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    background: #f7fafd;
    border-radius: 16px;
    border: none;
    padding: 3px 10px;
    font-size: 0.85rem;
    font-family: Helvetica, Arial, sans-serif;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    user-select: none;
    transition: background 0.2s, color 0.2s;
    color: #064681;
    min-width: 60px;
    min-height: 22px;
}
.switch.active {
    background: #ffe3ec;
    color: #ee3162;
    min-width: 60px;
    min-height: 22px;
}
.switch .switch-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #b3c7e6;
    margin-right: 8px;
    border: none;
    box-shadow: none;
    transition: background 0.2s;
}
.switch.active .switch-dot {
    background: #ee3162;
    box-shadow: none;
}
input[type="file"] { display: none; }