:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --surface: #ffffff;
    --text-main: #1f2937;
    --text-sub: #6b7280;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 900px;
    margin: 40px auto;
    background: var(--surface);
    border-radius: 20px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    overflow: hidden;
    flex: 1;
}

/* Header */
header {
    background: #f8fafc;
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid #e5e7eb;
}

header h1 { color: var(--primary); font-size: 2rem; margin-bottom: 0.5rem; }
header p { color: var(--text-sub); }
.privacy-badge {
    display: inline-block;
    background: #dcfce7;
    color: #166534;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: 10px;
    border: 1px solid #bbf7d0;
}

/* Content */
.main-content { padding: 30px; }

/* Upload Area */
.upload-area {
    border: 3px dashed #cbd5e1;
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: #f8fafc;
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--primary);
    background: #eff6ff;
    transform: translateY(-2px);
}

.upload-icon { font-size: 4rem; margin-bottom: 1rem; display: block; }
.btn-upload {
    background: var(--primary);
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 15px;
}
.btn-upload:hover { background: var(--primary-hover); }

/* Controls */
.controls-panel {
    margin-top: 30px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 20px;
    background: #f8fafc;
    border-radius: 12px;
}

.control-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-main);
}

/* Color Picker */
.color-options { display: flex; gap: 10px; flex-wrap: wrap; }
.color-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid #e2e8f0;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
}
.color-btn:hover { transform: scale(1.1); }
.color-btn.active { border-color: var(--text-main); transform: scale(1.15); box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.color-btn input[type="color"] {
    opacity: 0; width: 100%; height: 100%; cursor: pointer;
}

/* Size Selector */
select {
    width: 100%;
    padding: 10px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font-size: 1rem;
}

/* Editor/Preview Area */
.editor-area {
    margin-top: 30px;
    display: none; /* Hidden by default */
    flex-direction: column;
    align-items: center;
}

canvas {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    background-image: linear-gradient(45deg, #ccc 25%, transparent 25%), linear-gradient(-45deg, #ccc 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #ccc 75%), linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.actions {
    margin-top: 20px;
    display: flex;
    gap: 15px;
}
.btn-download {
    background: #059669;
    color: white;
    padding: 12px 25px;
    border-radius: 50px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-download:hover { background: #047857; }

/* Loader Overlay */
.loader-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.9);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}
.spinner {
    width: 50px; height: 50px;
    border: 5px solid #e2e8f0;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}
.loading-text { font-weight: 600; color: var(--primary); }
.loading-subtext { font-size: 0.9rem; color: var(--text-sub); margin-top: 5px; }

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

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
}
footer a { color: white; text-decoration: none; margin: 0 10px; }
footer a:hover { text-decoration: underline; }

@media (max-width: 640px) {
    .container { margin: 0; border-radius: 0; }
    .controls-panel { grid-template-columns: 1fr; }
}