/* 重新设计的现代化CSS样式 - 大对话框版本 */

/* 基础重置和变量 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 颜色变量 */
    --primary-color: #10a37f;
    --primary-hover: #0d8a6b;
    --secondary-color: #6b7280;
    --background-color: #ffffff;
    --surface-color: #f7f7f8;
    --border-color: #e5e7eb;
    --text-primary: #374151;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --error-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* 深色模式变量 */
    --dark-bg: #212121;
    --dark-surface: #2f2f2f;
    --dark-border: #404040;
    --dark-text: #ffffff;
    --dark-text-secondary: #a0a0a0;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

/* 顶部导航栏 */
.top-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: 1000;
}

.navbar-left {
    display: flex;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 1.5rem;
    transform: translateY(2px);
}

.logo-text {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.navbar-center {
    display: flex;
    align-items: center;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--error-color);
}

.status-dot.connected {
    background-color: var(--success-color);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* 用户认证区域样式 */
.user-auth-area {
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-btn {
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 80px;
}

.sign-in-btn {
    background: transparent;
    color: #333;
    border-color: #e1e5e9;
}

.sign-in-btn:hover {
    background: #f8f9fa;
    border-color: #10a37f;
    color: #10a37f;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.2);
}

.sign-up-btn {
    background: linear-gradient(135deg, #10a37f 0%, #0d8a6b 100%);
    color: white;
    border-color: transparent;
}

.sign-up-btn:hover {
    background: linear-gradient(135deg, #0d8a6b 0%, #0a6b56 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
    font-weight: 600;
}

.user-details {
    display: flex;
    flex-direction: column;
    position: relative;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: #333;
    cursor: pointer;
}

.user-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #e1e5e9;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    min-width: 150px;
    padding: 8px 0;
}

.user-menu a {
    display: block;
    padding: 8px 16px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.user-menu a:hover {
    background-color: #f8f9fa;
}

.nav-btn {
    padding: var(--spacing-sm);
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.nav-btn:hover {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* 主聊天区域 */
.main-chat-area {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 120px;
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
}

/* 欢迎界面 */
.welcome-screen {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.welcome-content {
    text-align: center;
    max-width: 800px;
}

.welcome-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-xl);
    transform: translateY(50px);
}

.welcome-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.quick-start {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.start-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 200px;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.step-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.step-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 聊天界面 */
.chat-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

.chat-messages {
    flex: 1;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    padding: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
    scroll-behavior: smooth;
    min-height: 0;
}

.message {
    display: flex;
    gap: var(--spacing-lg);
    max-width: 90%;
    margin-bottom: var(--spacing-xl);
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.assistant {
    align-self: flex-start;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
    overflow: hidden;
}

.avatar-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.message.user .message-avatar {
    background-color: var(--primary-color);
    color: white;
}

.message.assistant .message-avatar {
    background-color: var(--surface-color);
    color: var(--text-primary);
}

.message-content {
    background-color: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    word-wrap: break-word;
    max-width: 600px;
    box-shadow: var(--shadow-sm);
}

.message.user .message-content {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.message-text {
    line-height: 1.7;
    font-size: 1rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

.message.user .message-time {
    color: rgba(255, 255, 255, 0.7);
}

/* 底部输入区域 */
.bottom-input-area {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    z-index: 1000;
}

.input-container {
    max-width: 1000px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-md);
    background-color: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    transition: border-color 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(16, 163, 127, 0.1);
}

.chat-input {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    padding: var(--spacing-sm);
    background-color: transparent;
    min-height: 28px;
    max-height: 120px;
}

.chat-input::placeholder {
    color: var(--text-muted);
}

.send-btn {
    padding: var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.send-btn:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
}

.input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
}

.file-upload-area {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.file-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s ease;
}

.file-btn:hover {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.typing-dots {
    display: flex;
    gap: 3px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--text-muted);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--background-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* 表单元素 */
.form-group {
    margin-bottom: var(--spacing-xl);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group small {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

/* 按钮 */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-color);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--surface-color);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(16, 163, 127, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(16, 163, 127, 0.1);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* 进度条 */
.upload-progress {
    margin-top: var(--spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
    text-align: center;
}

/* 行内加载样式 */
.inline-loading {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.inline-loading.completed {
    align-items: flex-start;
}

.inline-loading.completed span {
    line-height: 1.6;
}

.loading-spinner-small {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    flex-shrink: 0;
}

.loading-message {
    opacity: 0.9;
}

.loading-message .message-text {
    background-color: var(--surface-color);
    border: 1px dashed var(--primary-color);
}

/* 完成状态样式 */
.completed-message .message-text {
    background-color: #f0f9ff;
    border: 1px solid #0ea5e9;
}

.check-icon {
    width: 16px;
    height: 16px;
    background-color: #10b981;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    flex-shrink: 0;
}

/* 加载遮罩（保留用于特殊场景）*/
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

/* 拖拽上传提示层 */
.drag-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(16, 163, 127, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 4000;
    backdrop-filter: blur(8px);
    animation: fadeIn 0.2s ease-in-out;
}

.drag-overlay-content {
    text-align: center;
    color: white;
    padding: var(--spacing-2xl);
    border: 3px dashed rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    background-color: rgba(255, 255, 255, 0.1);
    min-width: 400px;
}

.drag-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: bounce 1s infinite;
}

.drag-text {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

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

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

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

.loading-text {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 通知 */
.notification-container {
    position: fixed;
    top: 80px;
    right: var(--spacing-lg);
    z-index: 4000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.notification {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    max-width: 400px;
    animation: slideIn 0.3s ease;
    font-size: 0.875rem;
}

.notification.success {
    background-color: var(--success-color);
    color: white;
}

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

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

.notification.info {
    background-color: var(--primary-color);
    color: white;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .top-navbar {
        padding: 0 var(--spacing-md);
    }
    
    .navbar-right {
        gap: var(--spacing-xs);
    }
    
    .nav-btn {
        width: 32px;
        height: 32px;
        padding: var(--spacing-xs);
    }
    
    .welcome-content h1 {
        font-size: 2rem;
    }
    
    .quick-start {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .message {
        max-width: 95%;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }
    
    .chat-messages {
        padding: var(--spacing-lg);
    }
    
    .input-container {
        padding: 0 var(--spacing-sm);
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: var(--dark-bg);
        --surface-color: var(--dark-surface);
        --border-color: var(--dark-border);
        --text-primary: var(--dark-text);
        --text-secondary: var(--dark-text-secondary);
        --text-muted: #6b7280;
    }
    
    .loading-overlay {
        background-color: rgba(33, 33, 33, 0.9);
    }
    
    .drag-overlay {
        background-color: rgba(16, 163, 127, 0.95);
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
    border: 1px solid var(--surface-color);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 聊天消息区域的滚动条 */
.chat-messages::-webkit-scrollbar {
    width: 10px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

/* 欢迎界面功能特性展示 */
.welcome-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(16, 163, 127, 0.05) 0%, rgba(16, 163, 127, 0.02) 100%);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(16, 163, 127, 0.1);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-item:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    font-size: 2rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, #0d8a6b 100%);
    border-radius: var(--radius-md);
    color: white;
}

.feature-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.feature-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* 移动端功能特性适配 */
@media (max-width: 768px) {
    .welcome-features {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        margin: var(--spacing-lg) 0;
        padding: var(--spacing-md);
    }
    
    .feature-item {
        padding: var(--spacing-sm);
    }
    
    .feature-icon {
        font-size: 1.5rem;
        width: 40px;
        height: 40px;
    }
}