:root {
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #212529;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --accent-color-blue: #0d6efd;
    --accent-color-green: #198754;
    --accent-color-green-hover: #157347;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 500px;
}

.card {
    background-color: var(--card-background);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 32px;
    text-align: center;
}

h1 {
    font-size: 22px;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#logo-img {
    width: 40px; /* 로고 이미지 크기 */
    height: 40px;
    margin-right: 8px; /* 로고와 텍스트 사이 여백 */
}

#drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 32px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

#drop-zone.dragover {
    background-color: #f0f7ff;
    border-color: var(--accent-color-blue);
}

#drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

#drop-zone-content .fa-cloud-arrow-up {
    font-size: 40px;
    margin-bottom: 16px;
}

#drop-zone-text .file-name {
    font-weight: 600;
    color: var(--text-color);
    padding: 8px 16px;
    background-color: #e9ecef;
    border-radius: 8px;
    display: inline-block;
    margin-top: 16px;
}

.separator {
    display: flex;
    align-items: center;
    width: 100%;
    font-size: 14px;
    color: #adb5bd;
    margin: 16px 0;
}

.separator::before,
.separator::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.separator::before {
    margin-right: 8px;
}

.separator::after {
    margin-left: 8px;
}

#file-input-btn {
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-color-blue);
    background-color: var(--card-background);
    border: 1px solid var(--accent-color-blue);
    border-radius: 6px;
    padding: 8px 20px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

#file-input-btn:hover {
    background-color: var(--accent-color-blue);
    color: var(--card-background);
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
    text-align: left;
}

.option-item label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

select {
    width: 100%;
    font-family: var(--font-family);
    font-size: 14px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: #f8f9fa;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 12px;
}

#convert-btn {
    width: 100%;
    font-family: var(--font-family);
    font-size: 16px;
    font-weight: 600;
    color: var(--card-background);
    background-color: var(--accent-color-green);
    border: none;
    border-radius: 8px;
    padding: 12px;
    margin-top: 24px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
}

#convert-btn:hover:not(:disabled) {
    background-color: var(--accent-color-green-hover);
}

#convert-btn:disabled {
    background-color: #a3d9b8;
    cursor: not-allowed;
}

#convert-btn .fa-arrows-rotate.fa-spin {
    animation: fa-spin 1s infinite linear;
}

@keyframes fa-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#status {
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-muted);
}

#progress-container {
    width: 100%;
    background-color: #e9ecef;
    border-radius: 10px;
    margin-top: 8px;
    overflow: hidden;
    display: none; /* Initially hidden */
}

#progress-bar {
    width: 0%;
    height: 10px;
    background-color: var(--accent-color-blue);
    border-radius: 10px;
    transition: width 0.2s;
}

.hidden {
    display: none;
}