:root {
    --primary-blue: #1a237e;
    --secondary-blue: #3949ab;
    --primary-purple: #4a148c;
    --secondary-purple: #7b1fa2;
    --light-blue: #e8eaf6;
    --light-purple: #f3e5f5;
    --text-light: #ffffff;
    --text-dark: #212121;
    --card-bg: rgba(255, 255, 255, 0.95);
    --gradient-bg: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    --transition-speed: 0.3s;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
}

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--gradient-bg);
    color: var(--text-light);
    min-height: 100vh;
    line-height: 1.6;
    background-attachment: fixed;
    position: relative;
    overflow-x: hidden;
    opacity: 0;
    transition: opacity 0.5s ease;
}

body.loaded {
    opacity: 1;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(74, 20, 140, 0.3) 0%, transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(26, 35, 126, 0.3) 0%, transparent 30%);
    z-index: -1;
}

header {
    text-align: center;
    padding: 4rem 1rem 8rem;
    background: linear-gradient(to right, var(--primary-blue), var(--primary-purple));
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.header-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.wave-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    z-index: 1;
}

.wave {
    position: relative;
    display: block;
    width: 100%;
    height: 80px;
    animation: wave 10s linear infinite;
}

@keyframes wave {
    0% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(-25%);
    }
    100% {
        transform: translateX(0);
    }
}

header h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 700;
    letter-spacing: 1px;
    display: inline-block;
}

header h1 i {
    margin-right: 0.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

.container {
    max-width: 1400px;
    margin: -4rem auto 2rem;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.category-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2.5rem 2rem;
    color: var(--text-dark);
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    cursor: pointer;
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
    opacity: 0;
    transform: translateY(30px);
}

.category-card.animated {
    animation: fadeInUp 0.6s forwards;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--secondary-blue), var(--secondary-purple));
}

.category-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 0;
    background: linear-gradient(135deg, transparent, rgba(123, 31, 162, 0.1));
    transition: all 0.5s ease;
}

.category-card:hover::after {
    width: 100%;
    height: 100%;
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-purple);
    transition: transform 0.5s;
}

.category-card:hover .category-icon {
    transform: translateY(-10px) scale(1.1);
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.category-card h2 {
    color: var(--primary-purple);
    margin-bottom: 1rem;
    font-size: 2rem;
    font-weight: 600;
}

.category-card p {
    color: #555;
    font-size: 1.05rem;
}

.hidden {
    display: none;
}

.container-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.back-button {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(to right, var(--secondary-blue), var(--secondary-purple));
    color: var(--text-light);
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-weight: 500;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    border: none;
}

.back-button i {
    margin-right: 0.5rem;
    transition: transform 0.3s;
}

.back-button:hover i {
    transform: translateX(-3px);
}

.back-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
}

#model-list-container, #model-detail-container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 3rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    color: var(--text-dark);
    box-shadow: var(--box-shadow);
    position: relative;
    animation: fadeIn 0.5s forwards;
}

#category-title {
    font-size: 2.5rem;
    color: var(--primary-purple);
    position: relative;
    display: inline-block;
    margin: 0;
}

#category-title i {
    margin-right: 0.5rem;
}

#category-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--secondary-blue), var(--secondary-purple));
    border-radius: 2px;
}

#model-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.model-card {
    background: linear-gradient(135deg, var(--light-blue), var(--light-purple));
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.7);
    opacity: 0;
}

.model-card.fade-in {
    animation: fadeInUp 0.5s forwards;
}

.model-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.model-card h3 {
    color: var(--primary-blue);
    margin-bottom: 0.8rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.model-card h3 i {
    margin-right: 0.5rem;
}

.model-card p {
    color: #444;
    font-weight: 500;
}

.model-card p i {
    margin-right: 0.5rem;
    color: var(--secondary-blue);
}

#model-detail {
    padding: 1.5rem 0;
}

.model-info {
    margin-bottom: 2rem;
}

.model-info h2 {
    color: var(--primary-purple);
    margin-bottom: 0.5rem;
    font-size: 2.5rem;
    font-weight: 700;
    padding-bottom: 0.5rem;
    display: flex;
    align-items: center;
}

.model-info h2 i {
    margin-right: 0.8rem;
}

.model-org {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: 2rem;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.model-org i {
    margin-right: 0.5rem;
    color: var(--secondary-blue);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.info-card {
    background: linear-gradient(135deg, var(--light-blue), var(--light-purple));
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s;
    border: 1px solid rgba(255, 255, 255, 0.7);
    position: relative;
    overflow: hidden;
    opacity: 0;
}

.info-card.fade-in {
    animation: fadeInUp 0.5s forwards;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.info-card h3 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    font-size: 1.3rem;
    font-weight: 600;
    border-bottom: 2px solid rgba(123, 31, 162, 0.3);
    display: flex;
    align-items: center;
}

.info-card h3 i {
    margin-right: 0.5rem;
}

.info-card p {
    color: #333;
    line-height: 1.7;
}

.info-card strong {
    font-weight: 600;
    color: var(--primary-purple);
}

.info-card a {
    color: var(--secondary-blue);
    text-decoration: none;
    transition: color 0.2s;
    display: inline-flex;
    align-items: center;
}

.info-card a i {
    margin-left: 0.3rem;
    font-size: 0.8rem;
}

.info-card a:hover {
    color: var(--primary-purple);
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 3rem 1rem;
    margin-top: 4rem;
    background: var(--primary-blue);
    color: var(--text-light);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--secondary-blue), var(--secondary-purple));
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-light);
    font-size: 1.2rem;
    transition: all 0.3s;
}

.footer-links a:hover {
    color: var(--light-purple);
    transform: translateY(-3px);
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

.in-view {
    animation: fadeInUp 0.5s forwards;
}

/* 响应式调整 */
@media (max-width: 768px) {
    header {
        padding: 3rem 1rem 6rem;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    .container {
        margin-top: -3rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    #model-list-container, #model-detail-container {
        padding: 2rem 1.5rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    #category-title {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .container-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .back-button {
        margin-top: 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
    }
}