/* ==========================================================================
   基础样式
   ========================================================================== */

body {
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    overflow-y: auto;
    background-color: #fffef7;
    height: 500vh;
    width: 100vw;
    font-family: 'Noto Sans SC', 'Noto Sans TC', 'Noto Sans', sans-serif;
}

/* ==========================================================================
   背景地图
   ========================================================================== */

#world-map {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: url('World_map_with_points.svg');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.08;
}

/* ==========================================================================
   导航栏
   ========================================================================== */

#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(180deg, rgba(255, 254, 247, 0.95) 0%, rgba(255, 254, 247, 0.95) 20%, rgba(255, 254, 247, 0.9) 30%, rgba(255, 254, 247, 0.8) 50%, rgba(255, 254, 247, 0.5) 80%, rgba(255, 254, 247, 0.2) 90%, rgba(255, 254, 247, 0) 100%);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0px 30px 0 30px;
    box-sizing: border-box;
}

.nav-left {
    display: flex;
    align-items: center;
}

.nav-right {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-logo {
    width: 40px;
    height: 40px;
    margin-right: 8px;
}

.nav-text-logo {
    height: 27px;
    width: auto;
    margin-right: 40px;
}

.nav-item {
    color: #666;
    text-decoration: none;
    margin-right: 40px;
    font-size: 18px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-item:hover {
    color: #333;
}

#language-selector {
    background: none;
    border: none;
    color: #666;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    margin-right: 0;
}

#language-selector:hover {
    color: #333;
}

/* 移动端导航 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    margin-left: auto;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: #666;
    margin: 3px 0;
    transition: 0.3s;
}

.mobile-language-selector {
    display: none;
}

.mobile-language-selector select {
    background: none;
    border: none;
    color: #666;
    font-size: 20px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    text-align: center;
    width: 100%;
}

/* ==========================================================================
   主标题区域
   ========================================================================== */

#hero-section {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 50px;
    line-height: 1.6;
    z-index: 50;
    text-align: center;
}

.text-gray {
    color: #666;
    font-size: 0.85em;
    font-weight: 700;
}

.text-black {
    color: #000;
    font-weight: 800;
    font-size: 1.2em;
}

/* ==========================================================================
   主要内容区域
   ========================================================================== */

#main-content-section {
    position: absolute;
    top: 100vh;
    left: 40px;
    right: 40px;
    padding: 120px 0;
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 60px;
    text-align: center;
}

.content-container {
    display: flex;
    flex-direction: column;
    gap: 0px;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.question-container {
    flex-shrink: 0;
    text-align: center;
    margin-bottom: 40px;
}

.description-container {
    flex: 1;
    text-align: center;
    max-width: 500px;
}

.message-section {
    width: 100%;
    max-width: 1000px;
}

/* 文本样式 */
.content-text {
    font-size: 50px;
    line-height: 1.2;
    margin-bottom: 40px;
    color: #000;
}

.content-text.question {
    font-weight: 800;
    margin-bottom: 60px;
}

.content-text.description {
    color: #666;
    font-size: 42px;
    font-weight: 600;
}

.content-text.description.small {
    font-size: 24px;
    line-height: 1.1;
    letter-spacing: -0.5px;
}

/* ==========================================================================
   消息容器
   ========================================================================== */

.message-container {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 20px;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.message-list {
    display: flex;
    flex-direction: row;
    gap: 20px;
    animation: horizontalScroll 30s linear infinite;
    align-items: center;
}

.message-item {
    display: flex;
    justify-content: flex-start;
    flex-shrink: 0;
}

.message-content {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 25px;
    padding: 16px 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 280px;
    min-height: 50px;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.message-text {
    font-size: 14px;
    line-height: 1.4;
    color: #000;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.robot-tag {
    background: rgba(128, 128, 128, 0.15);
    color: #666;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 4px;
    font-weight: normal;
}

/* ==========================================================================
   "这是什么"区域
   ========================================================================== */

#about-section {
    position: absolute;
    top: 200vh;
    left: 40px;
    right: 40px;
    padding: 160px 0;
    z-index: 50;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.about-title {
    font-size: 50px;
    font-weight: 800;
    color: #000;
    margin-bottom: 40px;
    text-align: left;
}

.about-description {
    text-align: left;
}

.about-description p {
    font-size: 24px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 16px;
    margin-top: 0;
    font-weight: 600;
}

/* 特殊文本样式 */
.highlighted-text {
    border-bottom: 6px solid #e0b3ffc0;
    border-radius: 3px;
    padding-bottom: 2px;
    color: #000;
    font-size: 1.1em;
}

.black-text {
    color: #000;
    font-weight: 600;
    border-bottom: 6px solid #d71313da;
    border-radius: 3px;
    padding-bottom: 2px;
    font-size: 1.1em;
}

.memory-text {
    color: #000;
    font-weight: 600;
    border-bottom: 6px solid #ff6b6b;
    border-radius: 3px;
    padding-bottom: 2px;
    font-size: 1.1em;
}

.friend-text {
    color: #000;
    font-weight: 600;
    border-bottom: 6px solid #4ecdc4;
    border-radius: 3px;
    padding-bottom: 2px;
    font-size: 1.1em;
}

.initiative-text {
    color: #000;
    font-weight: 600;
    border-bottom: 6px solid #9b59b6;
    border-radius: 3px;
    padding-bottom: 2px;
    font-size: 1.1em;
}

/* ==========================================================================
   "它们有什么用"区域
   ========================================================================== */

#purpose-section {
    position: absolute;
    top: 300vh;
    left: 40px;
    right: 40px;
    padding: 160px 0;
    z-index: 50;
}

.purpose-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.purpose-title {
    font-size: 50px;
    font-weight: 800;
    color: #000;
    margin-bottom: 40px;
    text-align: left;
}

.purpose-description {
    text-align: left;
}

.purpose-description p {
    font-size: 24px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 16px;
    margin-top: 0;
    font-weight: 600;
}

/* ==========================================================================
   "使用场景"区域
   ========================================================================== */

#usage-section {
    position: absolute;
    top: 400vh;
    left: 40px;
    right: 40px;
    padding: 160px 0;
    z-index: 50;
}

.usage-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.usage-title {
    font-size: 50px;
    font-weight: 800;
    color: #000;
    margin-bottom: 40px;
    text-align: left;
}

.usage-description {
    text-align: left;
}

.usage-description h3 {
    font-size: 32px;
    font-weight: 700;
    color: #000;
    margin-top: 40px;
    margin-bottom: 20px;
    line-height: 1.4;
}

.usage-description p {
    font-size: 24px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 16px;
    margin-top: 0;
    font-weight: 600;
}

.usage-description p strong {
    color: #000;
    font-weight: 700;
}

/* ==========================================================================
   蝉动画元素
   ========================================================================== */

#cicada-container {
    position: absolute;
    transition: transform 0.1s linear;
    z-index: 40;
    opacity: 0.2;
}

#cicada {
    width: 45px;
    height: auto;
}

/* ==========================================================================
   动画
   ========================================================================== */

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

/* ==========================================================================
   价值页面样式
   ========================================================================== */

#value-section {
	padding: 120px 20px 40px;
	min-height: 100vh;
	background-color: #fffef7;
}

.value-content {
	max-width: 800px;
	margin: 0 auto;
	text-align: left;
}

.value-notice {
	margin-bottom: 40px;
	padding: 20px;
	background-color: rgba(255, 255, 255, 0.1);
	border-radius: 8px;
	border-left: 4px solid #007bff;
}

.value-notice p {
	font-size: 16px;
	color: #666;
	margin: 0;
	font-style: italic;
}

.value-item {
	margin-bottom: 60px;
	padding: 30px;
	background-color: rgba(255, 255, 255, 0.05);
	border-radius: 12px;
	border: 1px solid rgba(255, 255, 255, 0.1);
}

.value-item h3 {
	font-size: 24px;
	font-weight: 600;
	color: #333;
	margin-bottom: 20px;
	line-height: 1.4;
}

.value-item p {
	font-size: 16px;
	color: #555;
	line-height: 1.8;
	margin-bottom: 16px;
}

.value-item ul {
	margin: 20px 0;
	padding-left: 20px;
}

.value-item li {
	font-size: 16px;
	color: #555;
	line-height: 1.8;
	margin-bottom: 8px;
}

.value-item a {
	color: #007bff;
	text-decoration: none;
	border-bottom: 1px solid transparent;
	transition: border-bottom-color 0.3s ease;
}

.value-item a:hover {
	border-bottom-color: #007bff;
}

.search-paradigm {
	margin-top: 30px;
	padding: 25px;
	background-color: rgba(0, 123, 255, 0.05);
	border-radius: 8px;
	border-left: 4px solid #007bff;
}

.search-paradigm h4 {
	font-size: 18px;
	font-weight: 600;
	color: #333;
	margin-bottom: 15px;
}

.search-paradigm ul {
	margin: 15px 0;
	padding-left: 20px;
}

.search-paradigm li {
	font-size: 15px;
	color: #555;
	line-height: 1.6;
	margin-bottom: 8px;
}

.evolution-chain {
	margin: 20px 0;
	padding: 20px;
	background-color: rgba(255, 255, 255, 0.1);
	border-radius: 8px;
	text-align: center;
	font-size: 16px;
	color: #333;
	line-height: 1.6;
}

.evolution-chain span {
	font-weight: 500;
	color: #007bff;
}

blockquote {
	margin: 20px 0;
	padding: 20px 25px;
	background-color: rgba(255, 255, 255, 0.08);
	border-left: 4px solid #28a745;
	border-radius: 0 8px 8px 0;
	font-style: italic;
	color: #555;
	line-height: 1.8;
}

.value-differences {
	margin-top: 80px;
	padding-top: 40px;
	border-top: 2px solid rgba(255, 255, 255, 0.1);
}

.value-differences h2 {
	font-size: 32px;
	font-weight: 700;
	color: #333;
	margin-bottom: 40px;
	text-align: center;
}

.difference-item {
	margin-bottom: 50px;
	padding: 30px;
	background-color: rgba(255, 255, 255, 0.03);
	border-radius: 12px;
	border: 1px solid rgba(255, 255, 255, 0.08);
}

.difference-item h3 {
	font-size: 20px;
	font-weight: 600;
	color: #333;
	margin-bottom: 20px;
	line-height: 1.4;
}

.difference-item p {
	font-size: 16px;
	color: #555;
	line-height: 1.8;
	margin-bottom: 16px;
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

@media (max-width: 768px) {
    /* 导航栏 */
    .hamburger {
        display: flex;
    }
    
    .nav-left {
        display: flex;
        align-items: center;
    }
    
    .nav-right {
        display: none;
    }
    
    .nav-menu.active .mobile-language-selector {
        display: block;
        margin-top: 60px;
        margin-left: 0;
    }

    .nav-menu {
        position: fixed;
        left: -110%;
        top: 0;
        flex-direction: column;
        background: linear-gradient(180deg, rgba(255, 254, 247, 0.98) 0%, rgba(255, 254, 247, 0.95) 30%, rgba(255, 254, 247, 0.9) 60%, rgba(255, 254, 247, 0.85) 100%);
        width: 100%;
        height: 100vh;
        text-align: left;
        transition: 0.3s ease;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding-top: 120px;
        padding-left: 40px;
        justify-content: flex-start;
        align-items: flex-start;
        transform: translateX(0);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu .nav-item {
        margin: 25px 0 0 30px;
        font-size: 32px !important;
        display: block;
        text-align: left;
        line-height: 2;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    /* 主标题 */
    #hero-section {
        font-size: 28px;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
    
    .text-gray {
        font-size: inherit;
    }
    
    /* 主要内容区域 */
    #main-content-section {
        left: 40px;
        right: 40px;
        padding: 40px 0;
        gap: 40px;
        text-align: center;
    }
    
    .content-container {
        flex-direction: column !important;
        justify-content: center !important;
        gap: 0px !important;
        max-width: 100% !important;
        text-align: center !important;
    }
    
    .question-container {
        text-align: center !important;
    }
    
    .description-container {
        max-width: 100% !important;
        text-align: center !important;
    }
    
    .message-section {
        max-width: 100%;
    }
    
    /* 文本样式 */
    .content-text {
        font-size: 50px;
        margin-bottom: 40px;
    }
    
    .content-text.question {
        margin-bottom: 20px;
    }
    
    .content-text.description {
        font-size: 42px;
    }
    
    .content-text.description.small {
        font-size: 24px;
        line-height: 1.1;
        letter-spacing: -0.5px;
    }
    
    /* 消息容器 */
    .message-container {
        height: 300px;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    .message-list {
        animation: horizontalScroll 16s linear infinite !important;
    }
    
    .message-list:nth-child(2) {
        animation-delay: -8s;
    }
    
    .message-content {
        max-width: 240px;
        min-height: 45px;
        padding: 14px 18px;
    }
    
    .message-avatar {
        width: 28px;
        height: 28px;
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    }
    
    .message-text {
        font-size: 13px;
    }
    
    .robot-tag {
        font-size: 9px;
        padding: 1px 4px;
        border-radius: 3px;
    }
    
    /* "这是什么"区域 */
    #about-section {
        left: 20px;
        right: 20px;
        padding: 40px 0;
    }
    
    .about-title {
        font-size: 50px;
        margin-bottom: 30px;
        font-weight: 800;
        text-align: left;
    }
    
    .about-description p {
        font-size: 24px;
        line-height: 1.8;
        font-weight: 600;
        margin-bottom: 16px;
    }
    
    /* "它们有什么用"区域 */
    #purpose-section {
        left: 20px;
        right: 20px;
        padding: 40px 0;
    }
    
    .purpose-title {
        font-size: 50px;
        margin-bottom: 30px;
        font-weight: 800;
        text-align: left;
    }
    
    .purpose-description p {
        font-size: 24px;
        line-height: 1.8;
        font-weight: 600;
        margin-bottom: 16px;
    }
}

/* 页面标题样式 */
.page-title {
    margin-bottom: 20px;
}

.page-title h1 {
    font-size: 50px;
    font-weight: 800;
    color: #000;
    margin: 0;
    text-align: left;
}

/* 关于页面样式 */
.about-section {
    position: relative;
    padding: 200px 0 2rem;
    min-height: 100vh;
    background-color: #fffef7;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.about-title {
    text-align: left;
    line-height: 1.5;
    margin-top: 100px;
}

.about-title .text-gray {
    font-size: 0.5em;
    color: #666;
    font-weight: 400;
}

.about-title .text-black {
    font-size: 0.5em;
    color: #999;
    font-weight: 400;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.about-content p {
    line-height: 1.6;
    color: #555;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.location-note {
    font-size: 0.9em;
    color: #888;
    font-weight: normal;
}