/* --- 根变量定义 --- */
:root {
    --bg-color: #f8f5f2; /* 更柔和的米白 */
    --card-bg-color: #ffffff;
    --heading-color: #1a1a1a; /* 更深的标题色 */
    --text-color: #4a4a4a; /* 柔和的灰色 */
    --accent-color: #c0392b; /* 更沉稳的红色 */
    --accent-hover-color: #a93226;
    --white: #ffffff;
    --font-sans: 'Microsoft YaHei', 'SimSun', sans-serif;
    --font-serif: 'Georgia', 'serif';
    --border-radius: 6px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
    --transition: all 0.3s ease-in-out;
}

/* --- 全局样式重置与基础设定 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
}

main {
    width: 100%;
    overflow-x: hidden;
}

section {
    padding: 100px 8%;
    margin: 0 auto;
    max-width: 1600px;
}

h2 {
    font-family: var(--font-serif);
    font-size: 3rem;
    color: var(--heading-color);
    margin-bottom: 20px;
    font-weight: 500;
}

h3 {
    font-size: 1.5rem;
    color: var(--heading-color);
    margin-bottom: 10px;
}

p {
    margin-bottom: 1rem;
}

/* --- 头部与导航栏 --- */
header {
    background-color: var(--card-bg-color);
    padding: 20px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    width: 100%;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--accent-color);
    transition: var(--transition);
}

nav ul {
    display: flex;
    list-style: none;
    width: 100%;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding-bottom: 5px;
}

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

nav ul li a:hover::after,
nav ul li a.active::after {
    width: 100%;
}

/* --- Banner 全屏 --- */
.banner.full-screen {
    padding: 0;
    width: 100%;
    max-width: none;
    height: calc(100vh - 85px); /* 减去头部的大致高度 */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: url('../images/banner.jfif') no-repeat center center/cover;
    color: var(--white);
    position: relative;
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4); /* 蒙版 */
}

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

.banner-title {
    font-family: var(--font-serif);
    font-size: 4.5rem;
    color: var(--white);
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.banner-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
}

.banner-typewriter {
    font-family: var(--font-mono);
    color: var(--white);
    font-size: 1.1rem;
    height: 2rem; /* 固定高度防止跳动 */
}

.scroll-down-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    color: var(--white);
    font-size: 0.8rem;
    letter-spacing: 2px;
    writing-mode: vertical-rl;
    animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {transform: translateX(-50%) translateY(0);}
  40% {transform: translateX(-50%) translateY(-15px);}
  60% {transform: translateX(-50%) translateY(-10px);}
}

/* --- 交错布局 --- */
.layout-alternating {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.layout-alternating.reverse {
    grid-template-columns: 1fr 1fr;
}

.layout-alternating.reverse .intro-image,
.layout-alternating.reverse .did-you-know-image {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
}
.layout-alternating.reverse .intro-text,
.layout-alternating.reverse .did-you-know-text {
    grid-column: 1 / 2;
    grid-row: 1 / 2;
}

.intro-image, .did-you-know-image {
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}
.intro-image img, .did-you-know-image img {
    width: 100%;
    display: block;
    transition: transform 0.4s ease;
}
.intro-image:hover img, .did-you-know-image:hover img {
    transform: scale(1.05);
}

.intro-text h2, .did-you-know-text h2 {
    text-align: left;
}
.intro-text h2::after, .did-you-know-text h2::after {
    margin-left: 0;
    margin-right: auto;
}

/* --- 特色部分 --- */
.features {
    text-align: center;
}

.features h2 {
    margin-bottom: 5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
}

.feature-item {
    background: var(--card-bg-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}


/* --- 轮播图部分 (替换 Gallery) --- */
.gallery h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.carousel-container {
    position: relative;
    width: 80%;
    margin: auto;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.carousel-slides {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.carousel-slide {
    min-width: 100%;
    box-sizing: border-box;
}

.carousel-slide img {
    width: 100%;
    height: 500px; /* 固定高度 */
    object-fit: cover;
    display: block;
}

.carousel-prev, .carousel-next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: auto;
    padding: 16px;
    color: white;
    font-weight: bold;
    font-size: 24px;
    transition: 0.3s ease;
    background-color: rgba(0, 0, 0, 0.3);
    border: none;
    user-select: none;
}

.carousel-prev {
    left: 0;
    border-radius: 0 3px 3px 0;
}

.carousel-next {
    right: 0;
    border-radius: 3px 0 0 3px;
}

.carousel-prev:hover, .carousel-next:hover {
    background-color: rgba(0, 0, 0, 0.6);
}

.carousel-dots {
    text-align: center;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
}

.carousel-dot {
    cursor: pointer;
    height: 12px;
    width: 12px;
    margin: 0 5px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    display: inline-block;
    transition: background-color 0.3s ease;
}

.carousel-dot.active {
    background-color: var(--white);
}


/* --- 行动召唤区 --- */
.call-to-action {
    text-align: center;
    background-color: var(--card-bg-color);
    padding: 5rem 8%;
    border-radius: var(--border-radius);
    margin: 5rem auto;
}

.call-to-action h2 {
    font-size: 2.5rem;
}

.call-to-action p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* --- 动画 --- */
.intro, .feature-item, .gallery, .did-you-know {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.intro.is-visible, .feature-item.is-visible, .gallery.is-visible, .did-you-know.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 移除光标效果 */
.cursor-glow {
    display: none;
}

/* --- 页脚 --- */
footer {
    background-color: var(--bg-color);
    color: var(--text-color);
    text-align: center;
    padding: 30px 5%;
    font-size: 14px;
    font-family: var(--font-mono);
    margin-top: 40px;
    border-top: 1px solid rgba(0,0,0,0.05);
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
}

/* --- "返回顶部"按钮 --- */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    text-align: center;
    font-size: 24px;
    line-height: 50px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

#back-to-top:hover {
    background-color: var(--accent-hover-color);
    transform: translateY(-2px);
}

#back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* --- 二级页面样式 --- */
.page-header {
    padding: 120px 5% 40px;
    text-align: center;
}

.page-header h2 {
    font-size: 3rem;
    color: var(--heading-color);
}

.page-content {
    padding: 40px 15%;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.page-section h3 {
    color: var(--accent-color);
    font-size: var(--fz-xl);
    margin-bottom: 20px;
}

/* 移除了其他二级页面特有的样式，以保持简洁 */

/* 响应式设计 */
@media screen and (max-width: 768px) {
    header {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 15px;
    }
    
    .banner, .intro-content {
        flex-direction: column;
    }
    
    .banner-content, .intro-text {
        padding-right: 0;
        margin-bottom: 20px;
    }
    
    .feature-items {
        flex-direction: column;
    }
    
    .feature-item {
        margin-bottom: 20px;
    }
}

.item-5 { grid-column: 3 / 4; grid-row: 3 / 4; }


/* --- 子页面通用样式 --- */
.page-header {
    background-color: var(--card-bg-color);
    padding: 6rem 8%;
    text-align: center;
    border-bottom: 1px solid #e0e0e0;
}

.page-header h1 {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    color: var(--heading-color);
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-color);
    max-width: 600px;
    margin: 0 auto;
}

.page-content {
    padding-top: 5rem;
    padding-bottom: 5rem;
    max-width: 900px; /* 限制内容宽度以提高可读性 */
}

.page-section {
    background: var(--card-bg-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
}

.page-section h3 {
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.page-section-image {
    margin: 3rem 0;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.page-section-image img {
    width: 100%;
    display: block;
}


/* --- 行动召唤区 --- */
.call-to-action {
    text-align: center;
    background-color: var(--card-bg-color);
    padding: 5rem 8%;
    border-radius: var(--border-radius);
    margin: 5rem auto;
}

.call-to-action h2 {
    font-size: 2.5rem;
}

.call-to-action p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
}