/* 중앙정렬된 세련된 UI 스타일 */
html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    /* overflow: hidden; 제거 - 스크롤 허용 */
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px; /* 모바일 여백 */
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 40px;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    /* overflow: auto; 제거 */
}

h1 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 30px;
    color: #333;
    font-weight: 600;
}

/* Radio Group Styling */
.radio-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.radio-card {
    flex: 1;
    min-width: 120px;
    position: relative;
    cursor: pointer;
}

.radio-card input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-label {
    display: block;
    padding: 12px;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    color: #495057;
    transition: all 0.2s;
}

.radio-card input:checked + .radio-label {
    background-color: #e8f5e9;
    border-color: #3CB371;
    color: #2e7d32;
}

.radio-card:hover .radio-label {
    border-color: #3CB371;
}

/* Drop Zone Styling */
.drop-zone {
    border: 2px dashed #ccc;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: #fafafa;
    color: #666;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: #3CB371;
    background-color: #f0fff4;
    color: #3CB371;
}

/* File List Styling */
.file-list {
    list-style: none;
    padding: 0;
    margin-top: 15px;
    max-height: 200px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: #f8f9fa;
    border-radius: 4px;
    margin-bottom: 5px;
    font-size: 14px;
}

.file-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.file-size {
    color: #888;
    font-size: 12px;
}

.remove-btn {
    background: none;
    border: none;
    color: #ff6b6b;
    font-size: 18px;
    cursor: pointer;
    padding: 0 5px;
    width: auto; /* override default button width */
}

.remove-btn:hover {
    color: #fa5252;
    background: none;
}

/* Input Group */
.input-group {
    display: flex;
    gap: 10px;
}

input[type="number"],
select {
    width: 100%;
    padding: 12px;
    margin-bottom: 0; /* handled by gap */
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}

.section {
    margin-bottom: 30px;
}

.section h2 {
    font-size: 16px;
    margin-bottom: 15px;
    color: #555;
    border-bottom: none;
    font-weight: 600;
}

button[type="submit"] {
    background-color: #3CB371;
    color: #fff;
    padding: 16px;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    width: 100%;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.2s;
}

button[type="submit"]:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

button[type="submit"]:not(:disabled):hover {
    background-color: #2e8b57;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3CB371;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

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

/* Flash Messages */
.flash-messages {
    margin-bottom: 20px;
}

.flash-message {
    padding: 12px;
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: 14px;
}

.github-icon {
    display: flex;
    margin-top: 30px;
    justify-content: center;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.github-icon:hover {
    opacity: 1;
}

.github-icon a img {
    width: 28px;
    height: 28px;
}

.custom-file-upload {
    display: inline-block;
    padding: 10px 20px;
    cursor: pointer;
    background-color: #6c757d;
    color: #fff;
    border-radius: 4px;
}

.custom-file-upload:hover {
    background-color: #5a6268;
}

#file-name {
    display: block;
    margin-top: 10px;
    color: #555;
}

@media screen and (max-height: 700px) {
    .container {
        max-height: 90vh;
        overflow-y: auto;
    }
}

@media screen and (max-width: 600px) {
    .container {
        padding: 20px;
        width: 90%;
    }

    button {
        padding: 12px 20px;
        font-size: 14px;
    }

    .custom-file-upload {
        width: 100%;
        text-align: center;
        padding: 10px 0px;
    }
}