/* 文件传输服务 - 样式表 */

/* 基础重置和变量 */
:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    line-height: 1.6;
    color: var(--text-primary);
}

/* 容器布局 */
.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
header {
    text-align: center;
    padding: 2rem 1rem 1rem;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.logo .icon {
    font-size: 2rem;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* 主内容区 */
main {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
    width: 100%;
}

/* 选项卡导航 */
.tab-nav {
    display: flex;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 0.25rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    min-width: 120px;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* 选项卡内容 */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 文件上传区域 */
.upload-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.drop-content .drop-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.drop-text {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.drop-hint {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.select-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.select-btn:hover {
    background: var(--primary-hover);
}

/* 进度条 */
.progress-section {
    margin-top: 2rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: var(--success-color);
    transition: width 0.3s ease;
    border-radius: 4px;
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
}

/* 结果卡片 */
.result-section {
    margin-top: 2rem;
}

.result-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.success-icon {
    font-size: 1.5rem;
}

.result-header h3 {
    color: var(--success-color);
    font-size: 1.25rem;
}

.share-info {
    margin-bottom: 1.5rem;
}

.share-code,
.share-link {
    margin-bottom: 1rem;
}

.share-code label,
.share-link label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.code-display,
.link-display {
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    gap: 0.5rem;
}

.code-text,
.link-text {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.copy-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.copy-btn:hover {
    background: var(--primary-hover);
}

.expire-info {
    text-align: center;
    padding: 0.75rem;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--warning-color);
}

.expire-text {
    color: var(--warning-color);
    font-weight: 500;
}

.new-upload-btn,
.new-text-btn {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.new-upload-btn:hover,
.new-text-btn:hover {
    background: var(--primary-hover);
}

/* 文本分享区域 */
.text-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.text-input-area {
    margin-bottom: 2rem;
}

#textContent {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    margin-bottom: 1rem;
    transition: var(--transition);
}

#textContent:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.text-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

#textFilename {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

#textFilename:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.share-text-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.share-text-btn:hover {
    background: var(--primary-hover);
}

/* 下载区域 */
.download-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.download-input {
    text-align: center;
    margin-bottom: 2rem;
}

.download-input h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.code-input-group {
    display: flex;
    max-width: 400px;
    margin: 0 auto;
    gap: 1rem;
}

#downloadCode {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-align: center;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    transition: var(--transition);
}

#downloadCode:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.download-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.download-btn:hover {
    background: var(--primary-hover);
}

.file-info {
    margin-top: 2rem;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
}

.file-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.file-details {
    flex: 1;
}

.file-details h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.file-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.file-expire {
    font-size: 0.9rem;
    color: var(--warning-color);
    font-weight: 500;
}

.download-file-btn {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.download-file-btn:hover {
    background: #059669;
}

/* 帮助区域 */
.help-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.help-section h3 {
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.help-group {
    margin-bottom: 2rem;
}

.help-group h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.code-block {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    gap: 0.5rem;
}

.code-blocks .code-block {
    margin-bottom: 0.75rem;
}

.code-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-right: 0.5rem;
    font-weight: 500;
    min-width: 100px;
}

.code-block code {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    background: none;
    border: none;
    font-weight: 500;
}

.copy-code-btn {
    background: var(--text-muted);
    color: white;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: calc(var(--border-radius) - 2px);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
}

.copy-code-btn:hover {
    background: var(--text-secondary);
}

.help-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    padding-left: 0.5rem;
    border-left: 3px solid var(--border-color);
}

.config-table {
    overflow-x: auto;
}

.config-table table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.config-table th,
.config-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.config-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.config-table td code {
    background: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
}

/* 页脚 */
footer {
    padding: 2rem 1rem 1rem;
    text-align: center;
    color: white;
    margin-top: 2rem;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-content p {
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

/* 通知提示 */
.toast {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: var(--success-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
}

.toast.error {
    background: var(--error-color);
}

.toast.warning {
    background: var(--warning-color);
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 2rem;
    }
    
    .tab-nav {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .tab-btn {
        min-width: auto;
    }
    
    .upload-section,
    .text-section,
    .download-section,
    .help-section {
        padding: 1.5rem;
    }
    
    .drop-zone {
        padding: 2rem 1rem;
    }
    
    .text-controls {
        flex-direction: column;
    }
    
    .code-input-group {
        flex-direction: column;
    }
    
    .info-card {
        flex-direction: column;
        text-align: center;
    }
    
    .file-meta {
        justify-content: center;
    }
    
    .code-block {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .code-label {
        min-width: auto;
        margin-right: 0;
    }
    
    .toast {
        right: 1rem;
        left: 1rem;
        top: 1rem;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* 暗色主题支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --text-muted: #9ca3af;
        --bg-primary: #1f2937;
        --bg-secondary: #374151;
        --bg-tertiary: #4b5563;
        --border-color: #4b5563;
    }
    
    body {
        background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    }
}

/* 加载状态 */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

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

/* 错误状态 */
.error-message {
    background: var(--error-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.error-message::before {
    content: '❌';
}

/* 成功状态 */
.success-message {
    background: var(--success-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.success-message::before {
    content: '✅';
}