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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 20px;
}

.logo h1 {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    letter-spacing: -0.5px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.logo h1:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover::after {
    width: 100%;
}

/* 主页横幅 */
.hero {
    margin-top: 75px;
    min-height: 90vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 80px 20px;
}

.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    top: -300px;
    right: -200px;
    animation: pulse 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    bottom: -200px;
    left: -100px;
    animation: pulse 6s ease-in-out infinite reverse;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.hero-content {
    flex: 1;
    z-index: 2;
    max-width: 650px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 3.8rem;
    color: white;
    margin-bottom: 1.5rem;
    font-weight: 800;
    line-height: 1.15;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.6rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 1.2rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

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

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* 浮动卡片 */
.hero-decoration {
    flex: 1;
    position: relative;
    height: 450px;
    display: none;
}

@media (min-width: 992px) {
    .hero-decoration {
        display: block;
    }
}

.floating-card {
    position: absolute;
    background: white;
    padding: 2rem 1.8rem;
    border-radius: 24px;
    box-shadow: var(--shadow-2xl);
    text-align: center;
    animation: float 4s ease-in-out infinite;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.floating-card:hover {
    transform: translateY(-10px) !important;
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.3);
}

.card-1 {
    top: 50px;
    right: 100px;
    animation-delay: 0s;
}

.card-2 {
    top: 220px;
    right: 50px;
    animation-delay: 1.2s;
}

.card-3 {
    top: 120px;
    right: 270px;
    animation-delay: 2.4s;
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 0.8rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.floating-card p {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-dark);
    letter-spacing: 0.3px;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-15px) rotate(1deg);
    }
    75% {
        transform: translateY(-15px) rotate(-1deg);
    }
}

/* 通用区块样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.section-header h2 {
    font-size: 2.8rem;
    margin-bottom: 1.2rem;
    color: var(--text-dark);
    font-weight: 800;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-top: 1.5rem;
    font-weight: 400;
}

/* 关于部分 */
.about-section {
    background: linear-gradient(180deg, #ffffff 0%, var(--bg-light) 100%);
    position: relative;
}

.about-content {
    display: grid;
    grid-template-columns: 1.8fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text {
    font-size: 1.12rem;
    line-height: 2;
}

.about-text p {
    margin-bottom: 1.3rem;
    color: var(--text-light);
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

.about-text p:nth-child(1) { animation-delay: 0.1s; }
.about-text p:nth-child(2) { animation-delay: 0.2s; }
.about-text p:nth-child(3) { animation-delay: 0.3s; }
.about-text p:nth-child(4) { animation-delay: 0.4s; }
.about-text p:nth-child(5) { animation-delay: 0.5s; }

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

.about-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feature-item {
    background: white;
    padding: 2rem 1.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
}

.feature-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.feature-label {
    color: var(--text-dark);
    font-size: 1.05rem;
    font-weight: 600;
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    
    .about-features {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .feature-item {
        flex: 1;
        min-width: 150px;
    }
}

/* 功能区块 */
.features-section {
    background: var(--bg-light);
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: var(--shadow-2xl);
    border-color: var(--border-color);
}

.feature-icon {
    margin-bottom: 1.8rem;
}

.icon-number {
    display: inline-block;
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.feature-card h3 {
    font-size: 1.65rem;
    margin-bottom: 1.2rem;
    color: var(--text-dark);
    font-weight: 700;
    letter-spacing: -0.3px;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.feature-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.6rem 1.3rem;
    border-radius: 25px;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-badge {
    transform: scale(1.05);
    box-shadow: 0 6px 15px rgba(99, 102, 241, 0.4);
}

/* 用户评价 */
.testimonial-section {
    background: linear-gradient(180deg, var(--bg-light) 0%, #ffffff 100%);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.testimonial-card {
    background: white;
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    border: 2px solid transparent;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 25px;
    font-size: 5rem;
    color: var(--primary-color);
    opacity: 0.1;
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
}

.testimonial-avatar {
    font-size: 3.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.testimonial-content {
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.testimonial-content p {
    color: var(--text-light);
    font-style: italic;
    line-height: 2;
    font-size: 1.05rem;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--bg-light);
}

.testimonial-author strong {
    color: var(--text-dark);
    font-size: 1.15rem;
    font-weight: 700;
}

.testimonial-author span {
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
}

/* 联系我们 */
.contact-section {
    background: linear-gradient(180deg, #ffffff 0%, var(--bg-light) 100%);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.contact-item {
    text-align: center;
    padding: 3rem 2rem;
    background: white;
    border-radius: 24px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.contact-item:hover::before {
    opacity: 0.05;
}

.contact-item:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-10px);
    border-color: var(--primary-color);
}

.contact-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    position: relative;
    z-index: 1;
}

.contact-item h4 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--text-dark);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.contact-item p {
    color: var(--text-light);
    font-size: 1.05rem;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: white;
    padding: 70px 0 35px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 3.5rem;
    margin-bottom: 3.5rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.footer-section h3 {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    font-size: 1.05rem;
}

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

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    font-size: 1.05rem;
    position: relative;
}

.footer-section a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: width 0.3s ease;
}

.footer-section a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-section a:hover::after {
    width: 100%;
}

.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-links a {
    padding: 0.7rem 1.3rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.social-links a::after {
    display: none;
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.3);
}

.footer-bottom {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.65);
}

.footer-bottom p {
    margin: 0.4rem 0;
    font-size: 1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    section {
        padding: 70px 0;
    }

    .hero {
        padding: 50px 20px;
        margin-top: 70px;
    }

    .hero-title {
        font-size: 2.8rem;
        letter-spacing: -0.5px;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-description {
        font-size: 1.05rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .nav-links {
        gap: 1.5rem;
        font-size: 0.9rem;
    }
    
    .section-header h2 {
        font-size: 2.3rem;
    }
    
    .section-subtitle {
        font-size: 1.1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .testimonial-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 40px 15px;
        min-height: 85vh;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.15rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .navbar .container {
        padding: 1rem 15px;
    }
    
    .logo h1 {
        font-size: 1.6rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .section-header h2 {
        font-size: 1.9rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    section {
        padding: 50px 0;
    }
    
    .feature-card,
    .testimonial-card,
    .contact-item {
        padding: 2rem 1.5rem;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

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