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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 720px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: #fff;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
}

.subtitle {
    opacity: 0.9;
    font-size: 1rem;
}

section {
    background: #fff;
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* 二维码区域 */
.qr-section {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.qr-box {
    text-align: center;
}

#qrcode {
    display: inline-block;
    padding: 8px;
    background: #fff;
    border-radius: 8px;
}

#qrcode img, #qrcode canvas {
    display: block;
}

.qr-tip {
    margin-top: 8px;
    color: #666;
    font-size: 0.85rem;
}

.url-box {
    flex: 1;
    min-width: 240px;
}

.url-label {
    color: #666;
    font-size: 0.85rem;
    margin-bottom: 6px;
}

.url-value {
    background: #f5f5f7;
    padding: 12px 14px;
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.95rem;
    word-break: break-all;
    margin-bottom: 10px;
    color: #667eea;
    font-weight: 600;
}

.btn-copy, .btn-refresh {
    background: #667eea;
    color: #fff;
    border: none;
    padding: 8px 18px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.btn-copy:hover, .btn-refresh:hover {
    background: #5568d3;
}

/* 上传区域 */
.drop-zone {
    border: 2px dashed #c0c4cc;
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    color: #666;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: #667eea;
    background: #f8f9ff;
}

.drop-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.link {
    color: #667eea;
    font-weight: 600;
    text-decoration: underline;
}

.hint {
    margin-top: 8px;
    font-size: 0.85rem;
    color: #999;
}

/* 进度条 */
.progress-container {
    margin-top: 16px;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #555;
    margin-bottom: 6px;
}

.progress-bar {
    height: 8px;
    background: #eef0f5;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transition: width 0.15s;
}

/* 文件列表 */
.files-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.files-header h2 {
    font-size: 1.15rem;
    color: #333;
}

.file-list {
    list-style: none;
}

.file-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    border-radius: 10px;
    background: #f8f9fb;
    margin-bottom: 8px;
    transition: background 0.2s;
}

.file-list li:hover {
    background: #eef0f5;
}

.file-list li.empty {
    justify-content: center;
    color: #999;
    background: transparent;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.file-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
}

.file-meta {
    min-width: 0;
    flex: 1;
}

.file-name {
    font-size: 0.95rem;
    color: #333;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.file-size {
    font-size: 0.8rem;
    color: #999;
    margin-top: 2px;
}

.file-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.btn-download, .btn-delete {
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-download {
    background: #667eea;
    color: #fff;
}

.btn-download:hover {
    background: #5568d3;
}

.btn-delete {
    background: #fee;
    color: #e74c3c;
}

.btn-delete:hover {
    background: #fdd;
}

/* 移动端 */
@media (max-width: 600px) {
    header h1 {
        font-size: 1.6rem;
    }
    section {
        padding: 18px;
    }
    .qr-section {
        flex-direction: column;
    }
    .file-actions {
        flex-direction: column;
    }
}