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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Header Styles */
.header {
    padding: 2rem 1rem;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.title {
    font-size: 3.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    animation: fadeInDown 0.8s ease-out;
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 300;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 1rem;
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeIn 1s ease-out 0.4s both;
}

.hero-content {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 3rem 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.hero-title {
    font-size: 2.5rem;
    color: #ffffff;
    margin-bottom: 1rem;
    font-weight: 600;
}

.hero-description {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.6;
}

/* Cards Section */
.cards-section {
    margin-bottom: 4rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    animation: fadeIn 1s ease-out 0.6s both;
    align-items: stretch;
}

.cards-grid > * {
    display: flex;
    min-height: 100%;
}

.card-link {
    display: flex;
    text-decoration: none;
    color: inherit;
    height: 100%;
    width: 100%;
}

.card-link .card-title,
.card-link .card-description {
    text-decoration: none;
}

.card-link:hover .card-title,
.card-link:hover .card-description {
    text-decoration: none;
}

.card {
    border-radius: 20px;
    padding: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    width: 100%;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 100%;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

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

.card-content {
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.8rem;
    color: #ffffff;
    margin-bottom: 1rem;
    font-weight: 600;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    text-decoration: none;
}

.card-link .card-title {
    text-decoration: none !important;
}

.card-description {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.6;
}

/* Quote Section */
.quote-section {
    text-align: center;
    margin-top: 3rem;
    animation: fadeIn 1s ease-out 0.8s both;
}

.quote-content {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.quote-text {
    font-size: 1.4rem;
    color: #ffffff;
    font-style: italic;
    line-height: 1.8;
    font-weight: 300;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.8);
    margin-top: auto;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: rgba(255, 255, 255, 1);
    text-decoration: underline;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1.1rem;
    }

    .cards-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* 移动端右上角用户信息样式 */
    .header-content > div[style*="position: absolute"] {
        position: static !important;
        margin-top: 1rem;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-bar[style*="position: relative"] > div[style*="position: absolute"] {
        position: static !important;
        margin-top: 1rem;
        justify-content: center;
        flex-wrap: wrap;
    }
    }

    .quote-text {
        font-size: 1.2rem;
    }

    .main-content {
        padding: 2rem 1rem;
    }
}