/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #F9FAFB;
    color: #111827;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部 */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
}

.logo {
    font-size: 32px;
    font-weight: 700;
    color: #4F46E5;
    margin-bottom: 10px;
}

.tagline {
    font-size: 16px;
    color: #6B7280;
}

/* 卡片 */
.card {
    background: #FFFFFF;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 24px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #111827;
}

/* 上传区域 */
.upload-area {
    border: 2px dashed #E5E7EB;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: #4F46E5;
    background-color: #F9FAFB;
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.upload-text {
    font-size: 16px;
    color: #111827;
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 14px;
    color: #6B7280;
}

/* 文件信息 */
.file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: #F9FAFB;
    border-radius: 8px;
    margin-top: 16px;
}

.file-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.file-name {
    font-weight: 500;
    color: #111827;
}

.file-size {
    font-size: 14px;
    color: #6B7280;
}

/* 高级设置 */
.advanced-settings {
    margin-top: 20px;
}

.settings-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: none;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: #6B7280;
    transition: all 0.3s ease;
}

.settings-toggle:hover {
    background: #F9FAFB;
}

.toggle-icon {
    transition: transform 0.3s ease;
}

.settings-toggle.active .toggle-icon {
    transform: rotate(180deg);
}

.settings-content {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-size: 14px;
    font-weight: 500;
    color: #374151;
}

.setting-item input,
.setting-item select {
    height: 40px;
    padding: 0 12px;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.setting-item input:focus,
.setting-item select:focus {
    outline: none;
    border-color: #4F46E5;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: #4F46E5;
    color: #FFFFFF;
}

.btn-primary:hover {
    background: #3730A3;
}

.btn-secondary {
    background: #FFFFFF;
    color: #4F46E5;
    border: 1px solid #4F46E5;
}

.btn-secondary:hover {
    background: #F9FAFB;
}

.btn-danger {
    background: #EF4444;
    color: #FFFFFF;
}

.btn-danger:hover {
    background: #DC2626;
}

.btn-upload {
    width: 100%;
    margin-top: 20px;
    padding: 14px;
    font-size: 16px;
}

/* 上传进度 */
.upload-progress {
    margin-top: 20px;
}

.progress-bar {
    height: 8px;
    background: #E5E7EB;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: #4F46E5;
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    color: #6B7280;
}

.progress-details {
    margin-top: 16px;
    padding: 16px;
    background: #F9FAFB;
    border-radius: 8px;
}

.progress-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #E5E7EB;
}

.progress-row:last-child {
    border-bottom: none;
}

.progress-label {
    font-size: 14px;
    color: #6B7280;
}

.progress-value {
    font-size: 14px;
    font-weight: 500;
    color: #111827;
}

.progress-status {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    color: #6B7280;
}

/* 上传成功 */
.upload-success {
    text-align: center;
    margin-top: 20px;
}

.success-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.success-text {
    font-size: 18px;
    font-weight: 600;
    color: #10B981;
    margin-bottom: 20px;
}

.share-link {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.share-link input {
    flex: 1;
    height: 40px;
    padding: 0 12px;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    font-size: 14px;
    background: #F9FAFB;
}

.share-qrcode {
    margin: 20px 0;
}

/* 下载区域 */
.download-form {
    display: flex;
    gap: 12px;
}

.download-form input {
    flex: 1;
    height: 40px;
    padding: 0 12px;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    font-size: 14px;
}

.download-form input:focus {
    outline: none;
    border-color: #4F46E5;
}

/* 文件预览 */
.file-preview {
    margin-top: 20px;
    padding: 20px;
    background: #F9FAFB;
    border-radius: 8px;
}

.preview-info {
    margin-bottom: 16px;
}

.preview-name {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 8px;
}

.preview-size,
.preview-expiry {
    font-size: 14px;
    color: #6B7280;
    margin-bottom: 4px;
}

.password-input {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.password-input input {
    flex: 1;
    height: 40px;
    padding: 0 12px;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    font-size: 14px;
}

/* 历史记录 */
.history-list {
    max-height: 400px;
    overflow-y: auto;
}

.empty-history {
    text-align: center;
    color: #6B7280;
    padding: 40px 0;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid #E5E7EB;
}

.history-item:last-child {
    border-bottom: none;
}

.history-info {
    flex: 1;
}

.history-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.history-meta {
    font-size: 12px;
    color: #6B7280;
}

.history-actions {
    display: flex;
    gap: 8px;
}

.history-actions button {
    padding: 6px 12px;
    font-size: 12px;
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 40px 0;
    color: #6B7280;
    font-size: 14px;
}

.footer a {
    color: #4F46E5;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #111827;
    color: #FFFFFF;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: #10B981;
}

.toast.error {
    background: #EF4444;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .container {
        padding: 16px;
    }

    .header {
        padding: 20px 0;
    }

    .logo {
        font-size: 24px;
    }

    .card {
        padding: 16px;
    }

    .upload-area {
        padding: 40px 16px;
    }

    .upload-icon {
        font-size: 36px;
    }

    .download-form {
        flex-direction: column;
    }

    .share-link {
        flex-direction: column;
    }

    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .history-actions {
        width: 100%;
    }

    .history-actions button {
        flex: 1;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #E5E7EB;
    border-top-color: #4F46E5;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 禁用状态 */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 链接样式 */
a {
    color: #4F46E5;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}