/* ===================================
   AISoEasyHub - 高端科技黑主题样式
   设计风格：科技感 + 专业信任
   =================================== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 科技黑配色方案 */
    --primary-dark: #0A0E27;
    --primary-darker: #050711;
    --accent-blue: #00D4FF;
    --accent-purple: #7C3AED;
    --accent-gold: #FFB800;
    --text-white: #FFFFFF;
    --text-gray: #A0AEC0;
    --text-light: #CBD5E0;
    --border-glow: rgba(0, 212, 255, 0.3);
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-dark: linear-gradient(180deg, #0A0E27 0%, #050711 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 212, 255, 0.2) 0%, rgba(124, 58, 237, 0.2) 100%);
    --gradient-blue-purple: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    --gradient-text: linear-gradient(135deg, var(--accent-blue), var(--accent-purple), var(--accent-gold));
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 60px rgba(0, 212, 255, 0.2);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.3);
    
    /* 动画时间 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--primary-darker);
    color: var(--text-white);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 动态网格背景 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

/* 光晕效果 */
body::after {
    content: '';
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: var(--accent-blue);
    filter: blur(100px);
    opacity: 0.15;
    top: -200px;
    right: -200px;
    pointer-events: none;
    z-index: 0;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 50px) scale(1.1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* ===================================
   导航栏
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    padding: 1.5rem 0;
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    padding: 1rem 0;
    box-shadow: var(--shadow-lg);
}

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

.nav-brand a {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-blue-purple);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: all var(--transition-base);
}

.nav-brand a:hover {
    transform: scale(1.05);
}

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

.nav-menu a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: color var(--transition-base);
    padding: 0.5rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-blue);
    transition: width var(--transition-base);
}

.nav-menu a:hover {
    color: var(--text-white);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-white);
    transition: all 0.3s;
}

/* ===================================
   按钮样式
   =================================== */
.btn-primary, .btn-secondary {
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-blue-purple);
    color: white;
    box-shadow: 0 10px 40px rgba(0, 212, 255, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(0, 212, 255, 0.5);
}

.btn-primary:hover::before {
    left: 100%;
}

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

.btn-secondary:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-3px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

/* ===================================
   Hero 区域
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 0 4rem;
    position: relative;
    background: var(--gradient-dark);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

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

.hero-title {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    font-weight: 400;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-5px);
}

.stat-number {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient-blue-purple);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 0.5rem;
}

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

/* ===================================
   Section 通用样式
   =================================== */
section {
    padding: 6rem 0;
    position: relative;
}

.section-title {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-white);
}

.section-subtitle {
    text-align: center;
    color: var(--text-gray);
    font-size: 1.2rem;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===================================
   Problem Section
   =================================== */
.problem-section {
    background: var(--primary-dark);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.problem-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity 0.4s;
}

.problem-card:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: var(--shadow-xl);
}

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

.problem-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-white);
    position: relative;
    z-index: 1;
}

.problem-card p {
    color: var(--text-gray);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ===================================
   Services Section
   =================================== */
.services-section {
    background: var(--primary-darker);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity 0.4s;
}

.service-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: var(--shadow-xl);
}

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

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-blue-purple);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.service-card h3 {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-white);
    position: relative;
    z-index: 1;
}

.service-card p {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.service-features {
    list-style: none;
    padding: 0;
    position: relative;
    z-index: 1;
}

.service-features li {
    padding: 0.5rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

/* ===================================
   Why Section
   =================================== */
.why-section {
    background: var(--primary-dark);
}

.why-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-top: 3rem;
}

.why-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-white);
}

.why-text p {
    color: var(--text-gray);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.why-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.why-list li {
    padding: 1rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
    line-height: 1.7;
}

.why-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

.why-list li strong {
    color: var(--text-white);
}

.why-highlight {
    background: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--accent-blue);
    margin-top: 1.5rem;
    font-weight: 500;
    color: var(--text-light);
}

.expertise-diagram {
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto;
}

.expertise-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--gradient-blue-purple);
    color: white;
    padding: 2rem;
    border-radius: 50%;
    font-weight: 700;
    text-align: center;
    width: 150px;
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    z-index: 2;
}

.expertise-item {
    position: absolute;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 212, 255, 0.2);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    color: var(--text-white);
}

.expertise-item:nth-child(1) {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.expertise-item:nth-child(2) {
    bottom: 0;
    left: 0;
}

.expertise-item:nth-child(3) {
    bottom: 0;
    right: 0;
}

/* ===================================
   Contact Section
   =================================== */
.contact-section {
    background: var(--primary-dark);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    margin-top: 3rem;
}

.contact-info {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    height: fit-content;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-white);
}

.contact-benefits {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

.contact-benefits li {
    padding: 0.75rem 0;
    color: var(--text-light);
    font-weight: 500;
}

.contact-details {
    padding-top: 1.5rem;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
}

.contact-details p {
    margin: 0.5rem 0;
    color: var(--text-gray);
}

.contact-details strong {
    color: var(--text-white);
}

.contact-form {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    padding: 2.5rem;
    border-radius: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-white);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(0, 212, 255, 0.2);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-white);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-note {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-gray);
    text-align: center;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--primary-darker);
    color: white;
    padding: 3rem 0 1.5rem;
    border-top: 1px solid rgba(0, 212, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--text-white);
}

.footer-section p {
    color: var(--text-gray);
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-gray);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 212, 255, 0.1);
    color: var(--text-gray);
}

/* ===================================
   Blog Styles
   =================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.blog-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.blog-card:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: var(--shadow-xl);
}

.blog-card-image {
    width: 100%;
    height: 200px;
    background: var(--gradient-blue-purple);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.blog-card-content {
    padding: 1.5rem;
}

.blog-card-meta {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 0.5rem;
}

.blog-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-white);
}

.blog-card p {
    color: var(--text-gray);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.blog-card a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-base);
}

.blog-card a:hover {
    color: var(--accent-purple);
}

/* ===================================
   About Page
   =================================== */
.about-hero {
    background: var(--gradient-blue-purple);
    color: white;
    padding: 6rem 0 4rem;
    text-align: center;
    margin-top: 80px;
}

.about-hero h1 {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.about-content {
    max-width: 900px;
    margin: 3rem auto 0;
}

.about-content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-white);
}

.about-content p {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-size: 1.1rem;
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.credential-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    border-top: 4px solid var(--accent-blue);
    transition: all var(--transition-base);
}

.credential-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: var(--shadow-xl);
}

.credential-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-white);
}

.credential-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* ===================================
   Service Detail Page
   =================================== */
.service-detail {
    max-width: 900px;
    margin: 0 auto;
}

.service-detail-content {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    padding: 3rem;
    border-radius: 20px;
}

.service-icon-large {
    width: 100px;
    height: 100px;
    background: var(--gradient-blue-purple);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-glow);
}

.service-detail-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-white);
}

.service-intro {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.service-detail-content h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--text-white);
}

.service-detail-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.service-detail-list li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
    line-height: 1.7;
}

.service-detail-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
    font-size: 1.2rem;
}

.service-detail-list li strong {
    color: var(--text-white);
}

.service-cta {
    margin-top: 2rem;
    text-align: center;
}

/* ===================================
   Pricing Section
   =================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.pricing-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--accent-blue);
    transform: scale(1.05);
}

.pricing-card:hover {
    transform: translateY(-10px) scale(1.05);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: var(--shadow-xl);
}

.pricing-badge {
    background: var(--gradient-blue-purple);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-white);
}

.pricing-amount {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-blue-purple);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.pricing-desc {
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

.pricing-features li {
    padding: 0.75rem 0;
    color: var(--text-light);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* ===================================
   响应式设计
   =================================== */
@media (max-width: 768px) {
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .services-grid,
    .problem-grid,
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .why-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: scale(1);
    }
    
    section {
        padding: 4rem 0;
    }
}

/* ===================================
   动画效果
   =================================== */
@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.4); }
    50% { box-shadow: 0 0 0 10px rgba(0, 212, 255, 0); }
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 加载动画 */
@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

.loading {
    background: linear-gradient(90deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.1) 50%, rgba(255,255,255,0.05) 100%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}