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

/* 科幻背景效果 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #e0e0e0;
    background-color: #0a0e27;
    position: relative;
    overflow-x: hidden;
}

.background-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(100, 200, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(100, 200, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -2;
    animation: gridMove 20s linear infinite;
}

.background-glow {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(100, 150, 255, 0.1) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    z-index: -1;
    animation: glowPulse 4s ease-in-out infinite alternate;
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

@keyframes glowPulse {
    0% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

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

/* Header */
.header {
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(100, 200, 255, 0.2);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.nav-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtext {
    font-size: 0.8rem;
    color: rgba(100, 200, 255, 0.8);
    margin-top: -4px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: rgba(224, 224, 224, 0.8);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: #fff;
    text-shadow: 0 0 10px rgba(100, 200, 255, 0.5);
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, rgba(10, 14, 39, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
    color: #fff;
    padding: 140px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(100, 200, 255, 0.3)"/></svg>');
    background-size: 50px 50px;
    opacity: 0.5;
    animation: starsTwinkle 3s ease-in-out infinite alternate;
}

@keyframes starsTwinkle {
    0% {
        opacity: 0.3;
    }
    100% {
        opacity: 0.8;
    }
}

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

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(100, 200, 255, 0.1);
    border: 1px solid rgba(100, 200, 255, 0.3);
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #64b5f6;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
    animation: badgeGlow 2s ease-in-out infinite alternate;
}

@keyframes badgeGlow {
    0% {
        box-shadow: 0 0 10px rgba(100, 200, 255, 0.3);
    }
    100% {
        box-shadow: 0 0 20px rgba(100, 200, 255, 0.6);
    }
}

.hero-title {
    font-size: 3.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    background: linear-gradient(135deg, #fff 0%, #64b5f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(100, 200, 255, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    color: #b0c4de;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

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

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: #64b5f6;
    text-shadow: 0 0 10px rgba(100, 200, 255, 0.5);
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(224, 224, 224, 0.7);
    margin-top: 0.5rem;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 1.2rem 2.5rem;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

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

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: rgba(100, 200, 255, 0.1);
    color: #64b5f6;
    border: 2px solid rgba(100, 200, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(100, 200, 255, 0.2);
    border-color: rgba(100, 200, 255, 0.6);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(100, 200, 255, 0.3);
}

/* Section Styles */
section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    font-size: 2.8rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3.5rem;
    background: linear-gradient(135deg, #fff 0%, #64b5f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* Overview Section */
.overview {
    background: rgba(15, 23, 42, 0.8);
}

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

.overview-text p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #b0c4de;
    line-height: 1.8;
}

.overview-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.info-card {
    padding: 2rem;
    background: rgba(100, 200, 255, 0.05);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(100, 200, 255, 0.15);
    border-color: rgba(100, 200, 255, 0.4);
}

.info-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #64b5f6;
    margin-bottom: 1rem;
}

.info-card p {
    color: #b0c4de;
    margin: 0;
}

/* Objectives Section */
.objectives {
    background: rgba(10, 14, 39, 0.9);
}

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

.objective-card {
    padding: 2.5rem;
    background: rgba(100, 200, 255, 0.05);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 16px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.objective-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.objective-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(100, 200, 255, 0.2);
    border-color: rgba(100, 200, 255, 0.4);
}

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

.objective-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    display: block;
}

.objective-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fff;
}

.objective-card p {
    color: #b0c4de;
    line-height: 1.6;
}

/* Modules Section */
.modules {
    background: rgba(15, 23, 42, 0.8);
}

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

.module-card {
    padding: 2.5rem;
    background: rgba(100, 200, 255, 0.05);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    border-radius: 0 0 0 100px;
}

.module-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 50px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.4);
}

.module-number {
    font-size: 4rem;
    font-weight: 700;
    color: rgba(102, 126, 234, 0.2);
    margin-bottom: 1rem;
    line-height: 1;
}

.module-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #fff;
}

.module-description {
    color: #b0c4de;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.module-duration {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    color: #667eea;
    font-weight: 600;
}

/* Features Section */
.features {
    background: rgba(10, 14, 39, 0.9);
}

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

.feature-card {
    padding: 2.5rem;
    background: rgba(100, 200, 255, 0.05);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 16px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(100, 200, 255, 0.2);
    border-color: rgba(100, 200, 255, 0.4);
}

.feature-card:hover::after {
    width: 80%;
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    display: block;
    animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fff;
}

.feature-description {
    color: #b0c4de;
    line-height: 1.7;
}

/* Instructor Section */
.instructor {
    background: rgba(15, 23, 42, 0.8);
}

.instructor-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.instructor-card {
    text-align: center;
    padding: 3rem 2rem;
    background: rgba(100, 200, 255, 0.05);
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.instructor-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(100, 200, 255, 0.2);
    border-color: rgba(100, 200, 255, 0.4);
}

.instructor-avatar {
    font-size: 8rem;
    margin-bottom: 1.5rem;
    display: block;
}

.instructor-name {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #fff;
}

.instructor-title {
    font-size: 1.1rem;
    color: #64b5f6;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.instructor-bio {
    font-size: 1rem;
    color: #b0c4de;
    line-height: 1.7;
}

/* FAQ Section */
.faq {
    background: rgba(10, 14, 39, 0.9);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1.5rem;
    border: 1px solid rgba(100, 200, 255, 0.2);
    border-radius: 12px;
    overflow: hidden;
    background: rgba(100, 200, 255, 0.05);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 10px 30px rgba(100, 200, 255, 0.15);
    border-color: rgba(100, 200, 255, 0.4);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.8rem 2rem;
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.faq-question:hover {
    background: rgba(100, 200, 255, 0.08);
}

.faq-question h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #fff;
    margin: 0;
    flex: 1;
}

.faq-toggle {
    font-size: 1.8rem;
    font-weight: 700;
    color: rgba(100, 200, 255, 0.6);
    transition: all 0.3s ease;
    line-height: 1;
    margin-left: 1rem;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
    color: #64b5f6;
    text-shadow: 0 0 10px rgba(100, 200, 255, 0.5);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.5s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 2rem 2rem;
}

.faq-answer p {
    margin: 0;
    color: #b0c4de;
    line-height: 1.7;
}

/* Footer */
.footer {
    background: rgba(5, 8, 20, 0.95);
    border-top: 1px solid rgba(100, 200, 255, 0.2);
    padding: 60px 0 30px;
    position: relative;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    flex-direction: column;
}

.footer-logo .logo-text {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.logo-tagline {
    color: #b0c4de;
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #64b5f6;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-link {
    color: #b0c4de;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    display: block;
}

.footer-link:hover {
    color: #64b5f6;
    transform: translateX(5px);
}

.footer-copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(100, 200, 255, 0.1);
    color: #78909c;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .overview-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-stats {
        gap: 2rem;
    }

    .section-title {
        font-size: 2.2rem;
    }

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

    .instructor-content {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 80px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

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

    .btn {
        width: 100%;
        max-width: 300px;
    }

    section {
        padding: 80px 0;
    }

    .info-card,
    .module-card,
    .feature-card,
    .objective-card,
    .instructor-card {
        padding: 1.5rem;
    }

    .faq-question {
        padding: 1.5rem;
    }

    .faq-item.active .faq-answer {
        padding: 0 1.5rem 1.5rem;
    }
}