:root {
    --primary: #0055ff;
    --primary-dark: #0044cc;
    --primary-light: #e0eaff;
    --secondary: #ff3366;
    --dark: #111827;
    --light: #f9fafb;
    --gray: #6b7280;
    --gray-light: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --info: #3b82f6;
    --danger: #ef4444;
    
    --gradient-primary: linear-gradient(135deg, #0055ff 0%, #5e17eb 100%);
    --gradient-secondary: linear-gradient(135deg, #ff3366 0%, #ff8866 100%);
    --gradient-dark: linear-gradient(135deg, #111827 0%, #374151 100%);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

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

body {
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--light);
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
}

.section {
    padding: 8rem 0;
    position: relative;
}

.section-dark {
    background-color: var(--dark);
    color: var(--light);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    z-index: 1;
    border: none;
    outline: none;
    text-align: center;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
}

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

.btn-dark:hover {
    background: #2d3748;
    transform: translateY(-3px);
}

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

.btn-light:hover {
    background: var(--gray-light);
    transform: translateY(-3px);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1.5rem;
    font-size: 0.875rem;
}

.btn-icon {
    margin-left: 0.5rem;
}

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    padding: 1.5rem 0;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    padding: 1rem 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    letter-spacing: -0.5px;
}

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

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

.nav-link {
    font-weight: 500;
    font-size: 1.05rem;
    position: relative;
    transition: var(--transition);
}

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

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

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

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

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
}

/* 英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 8rem 0 6rem;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 200%;
    background: var(--primary-light);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.8;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 80%;
    background: var(--primary-light);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    z-index: -1;
    opacity: 0.5;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--primary-light);
    border-radius: var(--radius-full);
}

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--gray);
}

.hero-image {
    position: relative;
    z-index: 2;
}

.hero-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
    transition: var(--transition);
}

.hero-image:hover img {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.floating-element {
    position: absolute;
    border-radius: 50%;
    opacity: 0.6;
    filter: blur(20px);
}

.element-1 {
    top: 20%;
    left: 10%;
    width: 300px;
    height: 300px;
    background: var(--primary);
    animation: float 8s ease-in-out infinite;
}

.element-2 {
    bottom: 15%;
    right: 5%;
    width: 200px;
    height: 200px;
    background: var(--secondary);
    animation: float 6s ease-in-out infinite;
}

.element-3 {
    top: 60%;
    left: 20%;
    width: 150px;
    height: 150px;
    background: var(--success);
    animation: float 10s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(5deg);
    }
    100% {
        transform: translateY(0) rotate(0deg);
    }
}

/* 平台区域 */
.platforms {
    padding: 6rem 0;
    background: var(--light);
    position: relative;
    overflow: hidden;
}

.platforms::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(var(--primary-light) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.5;
    z-index: 0;
}

.platforms-container {
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 5rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1rem;
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--primary-light);
    border-radius: var(--radius-full);
}

.section-title {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.section-description {
    font-size: 1.125rem;
    color: var(--gray);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 2rem;
}

.platform-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    z-index: -1;
    transition: var(--transition);
}

.platform-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.platform-card:hover::before {
    opacity: 1;
}

.platform-name {
    font-weight: 600;
    font-size: 1.125rem;
    transition: var(--transition);
}

/* 特性区域 */
.features {
    padding: 8rem 0;
    background: white;
    position: relative;
    overflow: hidden;
}

.features-container {
    position: relative;
    z-index: 1;
}

.features-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.tab-button {
    padding: 1rem 2rem;
    background: var(--light);
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--gray);
}

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

.tab-button:hover:not(.active) {
    background: var(--gray-light);
    color: var(--dark);
}

.features-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    transition: var(--transition);
}

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

.feature-card:hover::before {
    width: 100%;
    opacity: 0.1;
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--primary-light);
    z-index: -1;
    transition: var(--transition);
}

.feature-card:hover .feature-icon::before {
    transform: scale(1.2);
}

.feature-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.feature-description {
    color: var(--gray);
    font-size: 1rem;
    position: relative;
    z-index: 1;
}

/* 安全图标颜色 */
.security .feature-icon { color: #7c4dff; }
.cloud .feature-icon { color: #00b0ff; }
.friends .feature-icon { color: #b388ff; }
.freedom .feature-icon { color: #ff8a65; }
.speed .feature-icon { color: #ffd54f; }
.wallet .feature-icon { color: #4d8aff; }
.robot .feature-icon { color: #ea80fc; }
.group .feature-icon { color: #ff8a80; }
.privacy .feature-icon { color: #69f0ae; }
.opensource .feature-icon { color: #40c4ff; }
.fun .feature-icon { color: #b2ff59; }
.video .feature-icon { color: #ffab40; }
.nearby .feature-icon { color: #ff80ab; }
.miniapp .feature-icon { color: #d500f9; }

/* 展示区域 */
.showcase {
    padding: 8rem 0;
    background: var(--gradient-primary);
    color: white;
    position: relative;
    overflow: hidden;
}

.showcase::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.2;
}

.showcase-container {
    position: relative;
    z-index: 1;
}

.showcase-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 5rem;
}

.showcase-title {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.showcase-description {
    font-size: 1.125rem;
    opacity: 0.9;
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem;
    align-items: center;
}

.showcase-image {
    position: relative;
}

.showcase-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.showcase-features {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.showcase-feature {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.showcase-feature-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.showcase-feature-content {
    flex: 1;
}

.showcase-feature-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.showcase-feature-description {
    font-size: 1rem;
    opacity: 0.9;
}

/* CTA 区域 */
.cta {
    padding: 8rem 0;
    background: white;
    position: relative;
    overflow: hidden;
}

.cta-container {
    background: var(--dark);
    border-radius: var(--radius-lg);
    padding: 5rem;
    color: white;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.cta-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(94, 23, 235, 0.3) 0%, rgba(0, 85, 255, 0) 100%);
    z-index: -1;
}

.cta-content {
    max-width: 600px;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.cta-description {
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

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

.cta-decoration {
    position: absolute;
    bottom: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.1;
    z-index: 0;
}

/* 页脚 */
.footer {
    background: var(--dark);
    color: white;
    padding: 5rem 0 2rem;
    position: relative;
}

.footer-container {
    position: relative;
    z-index: 1;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 4rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    display: inline-block;
}

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

.footer-description {
    font-size: 1rem;
    opacity: 0.7;
    margin-bottom: 2rem;
    max-width: 400px;
}

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

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-link a {
    opacity: 0.7;
    transition: var(--transition);
    display: inline-block;
}

.footer-link a:hover {
    opacity: 1;
    transform: translateX(5px);
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
}

.copyright {
    opacity: 0.7;
    font-size: 0.875rem;
}

.footer-bottom-links {
    display: flex;
    gap: 2rem;
}

.footer-bottom-link {
    opacity: 0.7;
    transition: var(--transition);
    font-size: 0.875rem;
}

.footer-bottom-link:hover {
    opacity: 1;
    color: var(--primary);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .section-title, .showcase-title, .cta-title {
        font-size: 2.5rem;
    }
    
    .platforms-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .features-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-content {
        text-align: center;
        margin: 0 auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image {
        max-width: 600px;
        margin: 0 auto;
    }
    
    .showcase-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .section {
        padding: 6rem 0;
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: white;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        z-index: 1000;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-item {
        margin: 1.5rem 0;
    }
    
    .nav-buttons {
        display: none;
    }
    
    .mobile-toggle {
        display: block;
        z-index: 1001;
    }
    
    .features-content {
        grid-template-columns: 1fr;
    }
    
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-container {
        padding: 3rem 2rem;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title, .showcase-title, .cta-title {
        font-size: 2rem;
    }
    
    .hero-buttons, .cta-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
        align-items: center;
    }
    
    .platforms-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
    }
}