:root {
    --primary: #8b5cf6;
    --primary-glow: #a78bfa;
    --accent: #06b6d4;
    --accent-glow: #22d3ee;
    --bg: #0b0f1c;
    --card-bg: rgba(18, 24, 40, 0.75);
    --card-border: rgba(255, 255, 255, 0.08);
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --text-muted: #64748b;
    --radius-lg: 1.6rem;
    --radius-md: 1rem;
    --radius-sm: 0.75rem;
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.15);
    --shadow-card: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background: var(--bg);
    background-image:
        radial-gradient(ellipse at 30% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 55%),
        radial-gradient(ellipse at 70% 70%, rgba(6, 182, 212, 0.06) 0%, transparent 55%),
        linear-gradient(180deg, #0b0f1c 0%, #111827 100%);
    font-family: 'Inter', 'SF Pro Display', system-ui, -apple-system, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 1.5rem;
    color: var(--text);
    line-height: 1.5;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

.glass-panel {
    position: relative;
    z-index: 1;
    background: var(--card-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card), var(--shadow-glow);
    padding: 1.8rem;
    width: 100%;
    max-width: 1050px;
    transition: box-shadow var(--transition);
}
.glass-panel:hover {
    box-shadow: 0 30px 60px -15px rgba(0,0,0,0.7), 0 0 40px rgba(139,92,246,0.1);
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.logo {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}
.logo-icon { font-size: 2rem; filter: drop-shadow(0 0 6px var(--primary-glow)); }
.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #e2e8f0 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}
.badge {
    background: rgba(139,92,246,0.2);
    border: 1px solid rgba(139,92,246,0.4);
    color: #c4b5fd;
    border-radius: 30px;
    padding: 0.2rem 0.9rem;
    font-size: 0.7rem;
    font-weight: 600;
    backdrop-filter: blur(8px);
}
.author {
    color: var(--text-muted);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.author a {
    color: var(--primary-glow);
    text-decoration: none;
    transition: color var(--transition);
}
.author a:hover { color: #c7d2fe; text-decoration: underline; }

.upload-area {
    border: 2px dashed rgba(139,92,246,0.4);
    border-radius: var(--radius-md);
    background: rgba(139,92,246,0.04);
    backdrop-filter: blur(12px);
    padding: 1.4rem 1.2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}
.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(139,92,246,0.1), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition);
}
.upload-area:hover {
    border-color: var(--primary);
    background: rgba(139,92,246,0.08);
    box-shadow: 0 0 25px rgba(139,92,246,0.2);
    transform: translateY(-2px);
}
.upload-area:hover::before { opacity: 1; }
.upload-area.dragover {
    background: rgba(139,92,246,0.15);
    border-color: var(--accent);
    box-shadow: 0 0 30px rgba(6,182,212,0.3);
    transform: scale(1.01);
}
.upload-area input { display: none; }
.upload-icon svg {
    width: 2.5rem;
    height: 2.5rem;
    stroke: var(--primary-glow);
    margin-bottom: 0.4rem;
    transition: transform var(--transition);
}
.upload-area:hover .upload-icon svg { transform: translateY(-3px); }
.upload-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: #f1f5f9;
    position: relative;
    z-index: 1;
}
.upload-desc {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 0.15rem;
    position: relative;
    z-index: 1;
}

.feature-section {
    margin-top: 1.8rem;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 1.2rem;
}
.feature-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.7rem;
    color: #f1f5f9;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.feature-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 10px currentColor;
}
.dot-convert { background: var(--primary); box-shadow: 0 0 12px var(--primary-glow); }
.dot-preview { background: var(--accent); box-shadow: 0 0 12px var(--accent-glow); }

.status-box {
    background: rgba(10,15,28,0.6);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: var(--radius-sm);
    padding: 0.8rem 1rem;
    margin-top: 0.5rem;
    text-align: center;
    min-height: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    backdrop-filter: blur(8px);
}
.loader {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(139,92,246,0.2);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
    flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }
.status-msg {
    color: #cbd5e1;
    font-weight: 500;
    font-size: 0.85rem;
}

.detail-log {
    background: rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 0.6rem;
    padding: 0.5rem 0.7rem;
    margin-top: 0.5rem;
    font-size: 0.7rem;
    color: #94a3b8;
    max-height: 90px;
    overflow-y: auto;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    text-align: left;
    width: 100%;
    line-height: 1.6;
}
.detail-log div {
    padding: 0.1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.02);
}

.armor-toggle-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: rgba(10,15,28,0.4);
    padding: 0.4rem 1rem;
    border-radius: 2rem;
    border: 1px solid rgba(139,92,246,0.25);
    backdrop-filter: blur(4px);
    flex-wrap: nowrap;
}
.toggle-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-glow);
    letter-spacing: 0.3px;
}
.toggle-hint {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-left: 0.2rem;
}
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
    flex-shrink: 0;
}
.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #334155;
    transition: 0.3s;
    border-radius: 34px;
}
.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}
input:checked + .toggle-slider {
    background-color: var(--primary);
}
input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.6rem;
    border-radius: 2.5rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    transition: all var(--transition);
    white-space: nowrap;
    color: #fff;
    background: rgba(139,92,246,0.2);
    border-color: rgba(139,92,246,0.4);
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}
.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s;
}
.btn:hover::after { left: 100%; }
.btn:hover {
    background: rgba(139,92,246,0.35);
    border-color: rgba(139,92,246,0.7);
    box-shadow: 0 8px 25px rgba(139,92,246,0.3);
    transform: translateY(-2px);
}
.btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(139,92,246,0.3);
}
.btn-download {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    border-color: rgba(139,92,246,0.5);
    box-shadow: 0 4px 15px rgba(139,92,246,0.4);
}
.btn-download:hover {
    background: linear-gradient(135deg, #9b6df7, #8b5cf6);
    box-shadow: 0 10px 25px rgba(139,92,246,0.5);
}
.btn-download:disabled {
    opacity: 0.4;
    pointer-events: none;
    filter: grayscale(30%);
}

.skin-selector {
    background: #1e293b;
    border: 1px solid #475569;
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 2rem;
    font-size: 0.8rem;
    cursor: pointer;
}

.footer-note {
    margin-top: 0.8rem;
    text-align: center;
    font-size: 0.7rem;
    color: #64748b;
    border-top: none;
    padding-top: 0.2rem;
}

.preview-canvas {
    width: 100%;
    height: 400px;
    background: #0f172a;
    border-radius: 1rem;
    margin-top: 1rem;
}

.flex-row {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.skin-count-badge {
    background: rgba(6,182,212,0.15);
    border: 1px solid rgba(6,182,212,0.3);
    color: var(--accent-glow);
    border-radius: 30px;
    padding: 0.15rem 0.8rem;
    font-size: 0.7rem;
    font-weight: 600;
}

#partSelectorContainer {
    margin-top: 0.6rem;
    padding: 0.6rem 0.8rem;
    background: rgba(10,15,28,0.5);
    border-radius: 1rem;
    border: 1px solid rgba(255,255,255,0.06);
    backdrop-filter: blur(4px);
}
.part-selector-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-bottom: 0.4rem;
}
.part-selector-label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--accent-glow);
}
.part-toggle-btn {
    background: rgba(139,92,246,0.15);
    border: 1px solid rgba(139,92,246,0.3);
    color: #c4b5fd;
    border-radius: 20px;
    padding: 0.15rem 0.8rem;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all var(--transition);
}
.part-toggle-btn:hover {
    background: rgba(139,92,246,0.3);
}
.part-checkbox-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 0.8rem;
    margin-top: 0.3rem;
}
.part-checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    color: #cbd5e1;
    cursor: pointer;
    background: rgba(255,255,255,0.03);
    padding: 0.1rem 0.5rem;
    border-radius: 12px;
    transition: background 0.2s;
}
.part-checkbox-item:hover {
    background: rgba(255,255,255,0.07);
}
.part-checkbox-item input[type="checkbox"] {
    accent-color: var(--primary);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

@media (max-width: 640px) {
    .glass-panel { padding: 1.2rem; }
    .logo h1 { font-size: 1.2rem; }
    .preview-canvas { height: 320px; }
    .btn { padding: 0.5rem 1.2rem; font-size: 0.75rem; }
    .armor-toggle-group { padding: 0.3rem 0.8rem; flex-wrap: wrap; }
    .toggle-label { font-size: 0.75rem; }
    .toggle-hint { display: none; }
    #exportDialog { padding: 0.8rem 1rem; }
}