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

:root {
    --primary-color: #1a1a1a;
    --secondary-color: #252525;
    --accent-color: #9370ff;
    --text-color: #e0e0e0;
    --light-text: #ffffff;
    --domestic-tag: #ff6b6b;
    --foreign-tag: #70a1ff;
    --card-bg: rgba(40, 40, 40, 0.7);
    --gradient-start: #1a1a1a;
    --gradient-end: #2d2d3a;
    --article-card-bg: rgba(45, 45, 55, 0.7);
    --article-hover-bg: rgba(55, 55, 65, 0.8);
    --tech-category: rgba(147, 112, 255, 0.15);
    --popular-category: rgba(255, 107, 107, 0.15);
    --practice-category: rgba(107, 185, 255, 0.15);
}

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

body {
    font-family: 'Poppins', sans-serif;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    overflow-x: hidden;
    min-height: 100vh;
}

section {
    padding: 100px 0;
    position: relative;
}

h1, h2, h3, h4, h5 {
    font-weight: 600;
    color: var(--light-text);
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

h2::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

/* 导航栏样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    background-color: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--light-text);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    bottom: -5px;
    left: 0;
    transition: width 0.3s ease;
}

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

.nav-menu a:hover, .nav-menu a.active {
    color: var(--light-text);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--light-text);
    transition: all 0.3s ease;
}

/* 首屏区域样式 */
.hero {
    height: 100vh;
    background-image: url('images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    margin-bottom: -50px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(26, 26, 26, 0.7), rgba(26, 26, 26, 0.9));
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero h1 {
    font-size: 4rem;
    color: var(--light-text);
    margin-bottom: 2rem;
    letter-spacing: 2px;
    text-shadow: 2px 2px 15px rgba(0, 0, 0, 0.5);
}

.hero-description {
    font-size: 1.3rem;
    line-height: 1.6;
    color: var(--light-text);
    margin-bottom: 2rem;
    text-shadow: 1px 1px 8px rgba(0, 0, 0, 0.5);
}

/* 大模型基础模块样式 */
.basics-section {
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.basics-section::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: radial-gradient(circle at 30% 70%, rgba(147, 112, 255, 0.1), transparent 60%);
    z-index: -1;
}

.basics-module {
    max-width: 1200px;
    margin: 0 auto 80px;
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.basics-module:last-child {
    margin-bottom: 0;
}

.module-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.module-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: rgba(147, 112, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
}

.module-icon i {
    font-size: 28px;
    color: var(--accent-color);
}

.module-header h3 {
    font-size: 2rem;
    font-weight: 600;
}

.module-content {
    padding-left: 80px;
}

/* 子模块1：大模型是什么？ */
.concept-explanation {
    margin-bottom: 40px;
}

.concept-explanation h4 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--light-text);
}

.concept-explanation p {
    font-size: 1.1rem;
    line-height: 1.6;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border-left: 4px solid var(--accent-color);
}

/* 子模块2：大模型对普通人有什么用？ */
.scenarios {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.scenario-category {
    background-color: rgba(40, 40, 50, 0.4);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.scenario-category:hover {
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.scenario-header {
    padding: 15px 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.scenario-header:hover {
    background-color: rgba(50, 50, 60, 0.6);
}

.scenario-header h4 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    margin: 0;
}

.scenario-header h4 i {
    color: var(--accent-color);
}

.toggle-icon {
    color: var(--accent-color);
    transition: transform 0.3s ease;
}

.scenario-header.active .toggle-icon {
    transform: rotate(180deg);
}

.scenario-items {
    display: none;
    flex-direction: column;
    gap: 15px;
    padding: 0 20px 20px;
}

.scenario-items.show {
    display: flex;
}

.scenario-item {
    background-color: rgba(40, 40, 50, 0.6);
    border-radius: 12px;
    padding: 15px;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.scenario-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    background-color: rgba(50, 50, 60, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.scenario-problem {
    flex: 1;
    font-weight: 500;
    text-align: right;
    padding-right: 10px;
}

.scenario-arrow {
    padding: 0 15px;
    color: var(--accent-color);
}

.scenario-solution {
    flex: 1.5;
    padding-left: 10px;
    border-left: 1px solid rgba(255, 255, 255, 0.1);
}

.warning-tips {
    background-color: rgba(255, 107, 107, 0.1);
    border-radius: 12px;
    padding: 20px;
    border-left: 4px solid var(--domestic-tag);
    display: flex;
    align-items: center;
    gap: 15px;
}

.warning-tips i {
    font-size: 1.5rem;
    color: var(--domestic-tag);
}

.warning-tips p {
    line-height: 1.6;
    margin: 0;
}

/* 子模块3：大模型的核心能力 */
.abilities-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.ability-card {
    background-color: rgba(50, 50, 60, 0.7);
    border-radius: 15px;
    padding: 25px 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.ability-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    background-color: rgba(60, 60, 70, 0.8);
}

.ability-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(147, 112, 255, 0.2), rgba(147, 112, 255, 0.4));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    transition: all 0.3s ease;
}

.ability-card:hover .ability-icon {
    transform: scale(1.1);
    background: linear-gradient(135deg, rgba(147, 112, 255, 0.4), rgba(147, 112, 255, 0.6));
}

.ability-icon i {
    font-size: 28px;
    color: var(--light-text);
}

.ability-card h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.ability-card p {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 大语言模型展示区样式 */
.models-section {
    background-color: transparent;
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.models-section::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: radial-gradient(circle at center, rgba(147, 112, 255, 0.1), transparent 60%);
    z-index: -1;
}

.models-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-wrap: nowrap;
    gap: 20px;
    padding: 30px;
    overflow-x: auto;
    perspective: 1000px;
    transform-style: preserve-3d;
    transform: rotateY(-10deg);
}

.models-container::-webkit-scrollbar {
    height: 8px;
}

.models-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

.models-container::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 10px;
}

.model-card {
    flex: 0 0 400px;
    height: 300px;
    background-color: var(--card-bg);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    transition: all 0.4s ease;
    position: relative;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.model-card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.model-tag {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--light-text);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.domestic {
    background-color: var(--domestic-tag);
}

.foreign {
    background-color: var(--foreign-tag);
}

.model-logo {
    width: 140px;
    height: 140px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.5s ease;
}

.model-card:hover .model-logo {
    transform: scale(1.1);
}

.model-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

.model-card h3 {
    font-size: 1.5rem;
    text-align: center;
    margin-top: 15px;
    color: var(--light-text);
    transition: transform 0.3s ease;
}

.model-card:hover h3 {
    transform: translateY(5px);
}

.discover-more {
    text-align: center;
    margin-top: 50px;
}

.discover-btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: transparent;
    color: var(--light-text);
    text-decoration: none;
    border: 2px solid var(--accent-color);
    border-radius: 30px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.discover-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 0.7s ease;
}

.discover-btn:hover {
    background-color: var(--accent-color);
    box-shadow: 0 5px 15px rgba(147, 112, 255, 0.4);
    transform: translateY(-3px);
}

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

/* 资源合集：优质文章与博主 */
.resources-section {
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.resources-section::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: radial-gradient(circle at 70% 30%, rgba(147, 112, 255, 0.1), transparent 60%);
    z-index: -1;
}

.resources-module {
    max-width: 1200px;
    margin: 0 auto 80px;
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.resources-module:last-child {
    margin-bottom: 0;
}

/* 优质文章推荐 */
.articles-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.article-category h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.article-card {
    display: flex;
    align-items: center;
    background-color: var(--article-card-bg);
    border-radius: 12px;
    padding: 15px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    background-color: var(--article-hover-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.article-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(147, 112, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    flex-shrink: 0;
}

.article-icon i {
    font-size: 20px;
    color: var(--accent-color);
}

.article-info {
    flex-grow: 1;
}

.article-info h5 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: var(--light-text);
}

.article-info p {
    font-size: 0.9rem;
    opacity: 0.8;
}

.article-arrow {
    margin-left: 15px;
    color: var(--accent-color);
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.article-card:hover .article-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* 优质博主推荐 */
.bloggers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.blogger-category h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.blogger-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.blogger-profile-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.blogger-profile-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.blogger-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 15px;
    border: 3px solid var(--accent-color);
}

.blogger-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.blogger-profile-card:hover .blogger-avatar img {
    transform: scale(1.1);
}

.blogger-info {
    text-align: center;
}

.blogger-info h5 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.blogger-platform {
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.blogger-reason {
    font-size: 0.9rem;
    opacity: 0.8;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 5px 15px;
    border-radius: 20px;
    display: inline-block;
}

/* 页脚联系信息样式 */
.footer {
    background-color: rgba(20, 20, 20, 0.8);
    color: var(--text-color);
    padding: 60px 0 20px;
    position: relative;
    backdrop-filter: blur(10px);
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
}

.contact-info {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 60px;
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    transition: transform 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-5px);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.contact-item p {
    font-size: 1.1rem;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .models-container {
        padding: 20px;
    }
    
    .model-card {
        flex: 0 0 350px;
    }
    
    .abilities-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
    
    .scenarios {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .articles-container,
    .bloggers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero h1 {
        font-size: 3.5rem;
    }
    
    .model-card {
        flex: 0 0 300px;
    }
    
    .basics-module,
    .resources-module {
        padding: 30px 20px;
    }
    
    .module-content {
        padding-left: 20px;
    }
    
    .abilities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scenarios {
        grid-template-columns: 1fr;
    }
    
    .bloggers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem 5%;
    }
    
    .hamburger {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(26, 26, 26, 0.95);
        backdrop-filter: blur(10px);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 15px 0;
    }
    
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    section {
        padding: 80px 0;
    }
    
    .model-card {
        flex: 0 0 280px;
    }
    
    .abilities-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .articles-container,
    .bloggers-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .model-card {
        flex: 0 0 260px;
    }
    
    .module-header {
        flex-direction: column;
        text-align: center;
    }
    
    .module-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .module-content {
        padding-left: 0;
    }
    
    .article-card {
        flex-direction: column;
        text-align: center;
    }
    
    .article-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .article-arrow {
        display: none;
    }
}