/* 全局样式重置和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 */
    --primary-color: #ff6b9d;
    --primary-dark: #e55a8a;
    --secondary-color: #4ecdc4;
    --accent-color: #45b7d1;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
    --gradient-secondary: linear-gradient(135deg, #4ecdc4 0%, #44a08d 100%);
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* 中性色 */
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #bdc3c7;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #2c3e50;
    
    /* 阴影 */
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
    
    /* 圆角 */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 20px;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
}

/* 背景粒子效果 */
#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: #ffffff;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 90px;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-logo i {
    margin-right: var(--spacing-xs);
    font-size: 1.8rem;
}

.logo-icon {
    width: 64px;
    height: 64px;
    margin-right: var(--spacing-md);
    transition: transform 0.3s ease;
}

.logo-icon:hover {
    transform: scale(1.1) rotate(5deg);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

/* 主要内容区域 */
main {
    margin-top: 90px;
}

/* 英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* 英雄区域视觉元素 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-large);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-heavy);
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
    max-width: 400px;
    width: 100%;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.message-bubble {
    padding: var(--spacing-md);
    border-radius: var(--radius-medium);
    max-width: 80%;
    position: relative;
    animation: slideIn 0.5s ease-out;
}

.message-bubble.user {
    background: var(--gradient-primary);
    color: white;
    align-self: flex-end;
    margin-left: auto;
}

.message-bubble.ai {
    background: var(--bg-secondary);
    color: var(--text-primary);
    align-self: flex-start;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 生成器区域 */
.generator-section {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.generator-card {
    background: white;
    border-radius: var(--radius-large);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-medium);
    max-width: 800px;
    margin: 0 auto;
}

.input-section {
    margin-bottom: var(--spacing-xl);
}

.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
}

.input-wrapper textarea {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid #e9ecef;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.3s ease;
}

.input-wrapper textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.input-btn {
    padding: var(--spacing-md);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-medium);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.input-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.preset-label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: var(--spacing-sm);
}

.preset-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: var(--radius-small);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

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

.output-section {
    border-top: 1px solid #e9ecef;
    padding-top: var(--spacing-xl);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.output-header h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

.output-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    padding: var(--spacing-sm);
    background: transparent;
    border: 1px solid #e9ecef;
    color: var(--text-secondary);
    border-radius: var(--radius-small);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.output-content {
    min-height: 120px;
    background: var(--bg-secondary);
    border-radius: var(--radius-medium);
    padding: var(--spacing-lg);
    border: 2px dashed #e9ecef;
}

.reply-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-light);
}

.placeholder i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

/* 功能特色区域 */
.features-section {
    padding: var(--spacing-xxl) 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-large);
    background: white;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 关于我们区域 */
.about-section {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.about-visual {
    display: flex;
    justify-content: center;
}

.visual-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-large);
    text-align: center;
    box-shadow: var(--shadow-medium);
    max-width: 300px;
    width: 100%;
}

.visual-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.visual-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.visual-card p {
    color: var(--text-secondary);
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-section p {
    color: #bdc3c7;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* 加载动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    text-align: center;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

.back-to-top.show {
    display: flex;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 90px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-medium);
        padding: var(--spacing-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .stats {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .preset-buttons {
        justify-content: center;
    }

    .output-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }

    .output-actions {
        align-self: flex-end;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .generator-card {
        padding: var(--spacing-lg);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.9rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

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

/* 选择文本样式 */
::selection {
    background: var(--primary-color);
    color: white;
}

/* 焦点样式 */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 打印样式 */
@media print {
    .navbar,
    .footer,
    .back-to-top,
    .loading-overlay {
        display: none !important;
    }
    
    body {
        background: white !important;
    }
}