/**
 * 极致美观的个人网站样式
 * 采用现代化设计理念，流畅动画和优雅渐变
 */

/* 基础样式重置与变量定义 */
:root {
    /* 主题色彩 - 亮色模式 */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --accent: #8b5cf6;
    
    /* 中性色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    --border: #e5e7eb;
    
    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* 尺寸与间距 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 动画时间 */
    --transition-fast: 150ms;
    --transition-normal: 250ms;
    --transition-slow: 350ms;
    
    /* 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 字体 */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* 暗色主题变量 */
[data-theme="dark"] {
    --primary: #818cf8;
    --primary-light: #a5b4fc;
    --primary-dark: #6366f1;
    --secondary: #f472b6;
    --accent: #a78bfa;
    
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #e5e7eb;
    --text-tertiary: #9ca3af;
    --border: #374151;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal) ease, color var(--transition-normal) ease;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast) ease;
}

a:hover {
    color: var(--primary-dark);
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: 1rem;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast) ease;
}

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

/* 背景效果 */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-sphere {
    position: absolute;
    top: -30%;
    right: -20%;
    width: 80vw;
    height: 80vw;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(236, 72, 153, 0.1) 50%, rgba(0, 0, 0, 0) 70%);
    filter: blur(40px);
    animation: float 20s ease-in-out infinite;
}

.particles-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(-5%, 5%);
    }
}

/* 页面容器 */
.page-container {
    display: flex;
    min-height: 100vh;
}

/* 侧边导航 */
.sidebar {
    width: 80px;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
    box-shadow: var(--shadow-md);
    transition: width var(--transition-normal) ease;
    z-index: 10;
}

.sidebar:hover {
    width: 200px;
}

.logo {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal) ease;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast) ease, background-color var(--transition-fast) ease;
    border-radius: var(--radius-md);
    width: 90%;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.nav-item i {
    font-size: 1.2rem;
    min-width: 24px;
    text-align: center;
}

.nav-item span {
    margin-left: 1rem;
    white-space: nowrap;
    opacity: 0;
    transform: translateX(10px);
    transition: opacity var(--transition-normal) ease, transform var(--transition-normal) ease;
}

.sidebar:hover .nav-item span {
    opacity: 1;
    transform: translateX(0);
}

.nav-item:hover {
    color: var(--primary);
    background-color: var(--bg-tertiary);
}

.nav-item.active {
    color: var(--primary);
    background-color: rgba(99, 102, 241, 0.1);
    font-weight: 500;
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.theme-toggle {
    margin-top: auto;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    transition: color var(--transition-fast) ease, background-color var(--transition-fast) ease;
}

.theme-toggle:hover {
    color: var(--primary);
    background-color: var(--bg-tertiary);
}

/* 主内容区 */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    max-height: 100vh;
}

/* 页面 */
.page {
    display: none;
    animation: fadeIn var(--transition-normal) ease;
}

.page.active {
    display: block;
}

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

/* 首页样式 */
.hero-section {
    text-align: center;
    margin-bottom: 3rem;
    padding: 3rem 0;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
    letter-spacing: -0.05em;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-description {
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-tertiary);
}

/* 卡片容器 */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal) ease, box-shadow var(--transition-normal) ease;
    cursor: pointer;
    position: relative;
    z-index: 1;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    opacity: 0;
    z-index: -1;
    transition: opacity var(--transition-normal) ease;
    border-radius: var(--radius-lg);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card:hover::before {
    opacity: 0.05;
}

.card-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal) ease;
}

.card:hover .card-icon {
    transform: scale(1.1);
}

.card h3 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* 项目页样式 */
.section-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50%;
    height: 4px;
    background: linear-gradient(to right, var(--primary), transparent);
    border-radius: var(--radius-full);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal) ease, box-shadow var(--transition-normal) ease;
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-content {
    padding: 1.5rem;
}

.project-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.2rem;
}

.project-card h3 {
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.project-card p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* 聊天页样式 */
.chat-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    height: 80vh;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 1rem 1.5rem;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
}

.chat-header h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.chat-messages {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 80%;
    padding: 1rem;
    border-radius: var(--radius-lg);
    animation: messageIn var(--transition-normal) ease;
}

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

.message.user {
    align-self: flex-end;
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius-lg) var(--radius-lg) 0 var(--radius-lg);
}

.message.bot {
    align-self: flex-start;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 0;
}

.chat-input-area {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.chat-input {
    flex: 1;
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all var(--transition-fast) ease;
    font-size: 0.95rem;
    box-shadow: var(--shadow-sm);
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.chat-send, .chat-settings {
    width: 45px;
    height: 45px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: white;
    transition: all var(--transition-normal) ease;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.chat-send::before, .chat-settings::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0) 70%);
    opacity: 0;
    transition: opacity var(--transition-fast) ease;
}

.chat-settings {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.chat-send:hover, .chat-settings:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.chat-send:hover::before, .chat-settings:hover::before {
    opacity: 1;
}

.chat-send:active, .chat-settings:active {
    transform: translateY(1px);
}

.chat-send:hover {
    background-color: var(--primary-dark);
}

.chat-settings:hover {
    color: var(--primary);
}

.chat-send i, .chat-settings i {
    font-size: 1.1rem;
    position: relative;
    z-index: 1;
}

/* 设置模态框 */
.settings-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: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal) ease, visibility var(--transition-normal) ease;
}

.settings-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: transform var(--transition-normal) ease;
}

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

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 30px;
    height: 30px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    transition: background-color var(--transition-fast) ease, color var(--transition-fast) ease;
}

.close-modal:hover {
    background-color: var(--error);
    color: white;
}

.model-options {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.model-option {
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color var(--transition-fast) ease, background-color var(--transition-fast) ease;
}

.model-option:hover {
    border-color: var(--primary);
}

.model-option.selected {
    border-color: var(--primary);
    background-color: rgba(99, 102, 241, 0.1);
}

/* 留言页样式 */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.contact-form {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast) ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.submit-btn {
    background-color: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: background-color var(--transition-fast) ease, transform var(--transition-fast) ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.submit-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.submit-btn i {
    font-size: 0.9rem;
}

.comments-section {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-height: 600px;
    overflow-y: auto;
}

.comments-section h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.comments-section h2 i {
    color: var(--primary);
}

.comments-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.comment {
    background-color: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    animation: fadeIn var(--transition-normal) ease;
    position: relative;
    border-left: 3px solid var(--primary);
}

.comment-header {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
}

.comment-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.comment-info {
    flex: 1;
}

.comment-author {
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.comment-date {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

.comment-body {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-left: 3.25rem;
}

.comment-actions {
    display: flex;
    gap: 1rem;
    margin-top: 0.75rem;
    margin-left: 3.25rem;
}

.comment-action {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    transition: color var(--transition-fast) ease;
}

.comment-action:hover {
    color: var(--primary);
}

.empty-message, .loading-message, .error-message {
    text-align: center;
    padding: 2rem;
    color: var(--text-tertiary);
}

/* 提示框样式 */
#toast-container {
    position: fixed;
    bottom: 5rem; /* 调整位置，避免被底部导航栏遮挡 */
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: toastIn var(--transition-normal) ease forwards;
    transition: opacity var(--transition-normal) ease;
    max-width: 300px;
    font-size: 0.9rem; /* 移动端字体稍小 */
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .contact-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .page-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: 70px;
        flex-direction: row;
        padding: 0 1rem;
        position: fixed;
        bottom: 0;
        left: 0;
        background-color: var(--bg-primary);
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
        z-index: 100;
    }
    
    /* 移动端禁用悬停效果 */
    .sidebar:hover {
        width: 100%;
    }
    
    .logo {
        margin-bottom: 0;
        width: 40px;
        height: 40px;
        font-size: 1.4rem;
        display: none; /* 在移动端隐藏logo，为导航腾出空间 */
    }
    
    .nav-links {
        flex-direction: row;
        justify-content: space-around;
        width: 100%;
        margin: 0;
    }
    
    .nav-item {
        padding: 0.75rem 0.5rem;
        width: auto;
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 1.2rem;
    }
    
    /* 移动端始终隐藏导航文字 */
    .nav-item span {
        display: none;
    }
    
    /* 禁用移动端导航项的悬停效果 */
    .sidebar:hover .nav-item span {
        opacity: 0;
        transform: translateX(10px);
    }
    
    .nav-item.active::before {
        display: none;
    }
    
    .nav-item.active {
        color: var(--primary);
    }
    
    .theme-toggle {
        display: none; /* 在移动端隐藏主题切换按钮，可以移到设置菜单中 */
    }
    
    .main-content {
        padding: 1.5rem;
        padding-bottom: 90px; /* 为底部导航栏留出空间 */
        max-height: none;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .cards-container, .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem; /* 调整卡片间距 */
    }
    
    /* 优化移动端触摸体验 */
    .card, .project-card, .nav-item, button {
        cursor: pointer;
        -webkit-tap-highlight-color: transparent; /* 移除触摸高亮 */
    }
    
    /* 增加触摸区域 */
    .card-icon, .project-icon {
        width: 50px;
        height: 50px;
    }
    
    /* 优化移动端表单元素 */
    input, textarea, select, button {
        font-size: 16px; /* 防止iOS自动缩放 */
    }
    
    /* 聊天界面移动端优化 */
    .chat-container {
        padding-bottom: 80px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .card-content, .project-content {
        padding: 1rem;
    }
    
    .contact-form, .comments-section {
        padding: 1.5rem;
    }
    
    /* 聊天界面移动端优化 */
    .chat-input {
        font-size: 0.9rem;
        padding: 0.75rem;
    }
    
    .chat-send {
        width: 40px;
        height: 40px;
    }
    
    .chat-settings {
        width: 36px;
        height: 36px;
    }
    
    .message {
        padding: 0.75rem;
        margin-bottom: 0.75rem;
    }
    
    .message-content {
        font-size: 0.9rem;
    }
}

/* 超小屏幕设备优化 */
@media (max-width: 360px) {
    .nav-item {
        padding: 0.5rem 0.25rem;
        font-size: 1rem;
    }
    
    .nav-item span {
        font-size: 0.65rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
}