:root {
    --primary-color: #2c3e50;
    --bg-color: #f8f9fa;
    --text-color: #333;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

header {
    margin-bottom: 2rem;
}

header h1 {
    font-size: 1.6rem;
    color: var(--primary-color);
    margin: 0 0 0.25rem;
}

header p {
    font-size: 0.9rem;
    color: #888;
    margin: 0;
}

.pdf-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border-top: 1px solid #e0e0e0;
}

.pdf-item a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid #e0e0e0;
    text-decoration: none;
    color: inherit;
    transition: background 0.15s;
}

.pdf-item a:hover {
    background: #f0f4f8;
}

.pdf-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.pdf-name {
    font-size: 1rem;
}

.loading, .empty, .error {
    padding: 2rem 1rem;
    color: #666;
    font-size: 1rem;
    list-style: none;
}

.error {
    color: #e74c3c;
}

footer {
    margin-top: 2.5rem;
    padding: 1rem 0;
    color: #bbb;
    font-size: 0.85rem;
}