:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 2rem;
}
.container {
    max-width: 800px;
    margin: 0 auto;
}
header {
    text-align: center;
    margin-bottom: 2rem;
}
header h1 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}
header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}
.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 2rem;
    margin-bottom: 1.5rem;
}
.card h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 1rem;
}
.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: #eff6ff;
}
.drop-zone .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.drop-zone p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}
.drop-zone .formats {
    font-size: 0.75rem;
    color: var(--text-muted);
}
input[type="file"] { display: none; }
.options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}
.option-group {
    flex: 1;
    min-width: 200px;
}
.option-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
select, input[type="number"] {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    background: white;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled {
    background: #94a3b8;
    cursor: not-allowed;
}
.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: #f1f5f9;
    border-radius: 8px;
    margin-bottom: 1rem;
}
.file-info .icon { font-size: 2rem; }
.file-info .details { flex: 1; }
.file-info .name { font-weight: 600; }
.file-info .size { font-size: 0.85rem; color: var(--text-muted); }
.file-info .remove {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.2rem;
}
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin: 1rem 0;
    display: none;
}
.progress-bar.active { display: block; }
.progress-bar .fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s;
    animation: progress-pulse 1.5s ease-in-out infinite;
}
@keyframes progress-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}
.status {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-top: 1rem;
    display: none;
}
.status.show { display: block; }
.status.success { background: #dcfce7; color: #166534; }
.status.error { background: #fee2e2; color: #991b1b; }
.status.info { background: #dbeafe; color: #1e40af; }
.formats-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
.formats-table th, .formats-table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.formats-table th {
    font-weight: 600;
    background: #f8fafc;
}
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge.full { background: #dcfce7; color: #166534; }
.badge.partial { background: #fef3c7; color: #92400e; }
.badge.stub { background: #e2e8f0; color: #475569; }
footer {
    text-align: center;
    margin-top: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}