:root {
    /* 黑夜模式 */
    --bg-primary: #0A0A0F;
    --bg-secondary: #12121A;
    --bg-tertiary: #1A1A25;
    --accent-primary: #8B5CF6;
    --accent-secondary: #06B6D4;
    --accent-gradient: linear-gradient(135deg, #8B5CF6, #06B6D4, #10B981);
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --spacing-section: 120px;
    --spacing-element: 24px;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* 白天模式 */
body.light-mode {
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F1F5F9;
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --glass-bg: rgba(0, 0, 0, 0.03);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 玻璃拟态 */
.glass-element {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
}

/* 渐变文本 */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 标题样式 */
.section__header {
    text-align: center;
    margin-bottom: 60px;
}

.section__title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section__subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
    font-size: 16px;
}

.btn--primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.4);
}

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

.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

/* 确保按钮在白天模式下正确显示 */
body.light-mode .btn--secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

body.light-mode .btn--secondary:hover {
    background: rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition-normal);
}

/* 确保导航栏在白天模式下正确显示 */
body.light-mode .header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.header__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
}

.header__lang {
    display: flex;
    gap: 8px;
    margin-right: 24px;
}

.lang-btn {
    padding: 6px 12px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 14px;
}

.lang-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.lang-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: var(--accent-primary);
}

/* 确保语言选择按钮在白天模式下正确显示 */
body.light-mode .lang-btn {
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
}

body.light-mode .lang-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

body.light-mode .lang-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: var(--accent-primary);
}

.header__theme {
    margin-right: 16px;
}

.theme-btn {
    padding: 8px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.theme-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

body.light-mode .theme-btn {
    color: var(--text-secondary);
}

body.light-mode .theme-btn:hover {
    color: var(--text-primary);
}

.logo__text {
    font-size: 24px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 确保logo在白天模式下正确显示 */
body.light-mode .logo__text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav__list {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav__link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav__link:hover {
    color: var(--accent-primary);
}

/* 确保导航栏在白天模式下正确显示 */
body.light-mode .nav__link {
    color: var(--text-primary);
}

body.light-mode .nav__link:hover {
    color: var(--accent-primary);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-normal);
}

.nav__link:hover::after {
    width: 100%;
}

/* Hero区域 */
.hero {
    padding: 160px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
    z-index: 0;
}

/* 确保Hero区域在白天模式下正确显示 */
body.light-mode .hero::before {
    background: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__text {
    max-width: 600px;
}

.hero__title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero__subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero__cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero__visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__ai-visual {
    position: relative;
    width: 300px;
    height: 300px;
}

.ai-visual__circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: var(--accent-gradient);
    opacity: 0.1;
    animation: pulse 3s ease-in-out infinite;
}

.ai-visual__icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: white;
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.5);
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.2;
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.1;
    }
}

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

.about__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about__text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-primary);
}

.about__text p {
    margin-bottom: 20px;
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat__card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.stat__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--glass-shadow);
}

.stat__card:hover::before {
    transform: scaleX(1);
}

.stat__number {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat__label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 核心功能 */
.features {
    padding: var(--spacing-section) 0;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 32px;
}

.feature__card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 40px 32px;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.feature__card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--glass-shadow);
}

.feature__card:hover::before {
    transform: scaleX(1);
}

.feature__icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    margin-bottom: 24px;
    transition: var(--transition-normal);
}

.feature__card:hover .feature__icon {
    transform: scale(1.1) rotate(5deg);
}

.feature__title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature__description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 服务内容 */
.services {
    padding: var(--spacing-section) 0;
    background: var(--bg-secondary);
}

.services__content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 40px;
    align-items: start;
}

.service__group-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 32px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.service__list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.service__item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 24px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    transition: var(--transition-normal);
}

.service__item:hover {
    transform: translateX(8px);
    box-shadow: var(--glass-shadow);
    border-color: var(--accent-primary);
}

.service__icon {
    font-size: 24px;
    color: var(--accent-primary);
    margin-top: 4px;
}

.service__title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.service__description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.service__divider {
    width: 1px;
    background: var(--glass-border);
    height: auto;
    align-self: stretch;
}

/* 联系我们 */
.contact {
    padding: var(--spacing-section) 0;
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact__form {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--glass-shadow);
}

.form__group {
    margin-bottom: 24px;
}

.form__label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    transition: var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.info__item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 24px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    transition: var(--transition-normal);
}

.info__item:hover {
    transform: translateY(-4px);
    box-shadow: var(--glass-shadow);
}

.info__icon {
    font-size: 24px;
    color: var(--accent-primary);
    margin-top: 4px;
}

.info__text h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.info__text p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 页脚 */
.footer {
    padding: 80px 0 40px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
}

.footer__content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer__logo h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer__tagline {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.footer__heading {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer__list a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-fast);
}

.footer__list a:hover {
    color: var(--accent-primary);
}

.social__icons {
    display: flex;
    gap: 16px;
}

.social__icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--glass-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition-normal);
    text-decoration: none;
}

.social__icon:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateY(-2px);
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--glass-border);
}

.footer__copyright {
    font-size: 14px;
    color: var(--text-muted);
}

.footer__legal {
    display: flex;
    gap: 24px;
}

.footer__legal a {
    font-size: 14px;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer__legal a:hover {
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero__content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero__visual {
        order: -1;
    }
    
    .about__content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .services__content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .service__divider {
        width: 100%;
        height: 1px;
    }
    
    .contact__content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer__content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header__nav {
        display: none;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero__title {
        font-size: 36px;
    }
    
    .hero__subtitle {
        font-size: 18px;
    }
    
    .hero__ai-visual {
        width: 200px;
        height: 200px;
    }
    
    .ai-visual__circle {
        width: 180px;
        height: 180px;
    }
    
    .ai-visual__icon {
        width: 80px;
        height: 80px;
        font-size: 32px;
    }
    
    .section__title {
        font-size: 28px;
    }
    
    .about__stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .features__grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .feature__card {
        padding: 32px 24px;
    }
    
    .contact__form {
        padding: 32px 24px;
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer__bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .footer__legal {
        justify-content: center;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.animated-element {
    animation: fadeIn 0.8s ease-out;
}

/* 滚动效果 */
.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}