/* 
 * 全局样式文件
 * 补充 Tailwind CSS 无法覆盖的特定交互与动画效果
 * 遵循极简主义与高性能原则
 */

/* -------------------------------------------------------------------------- */
/*  基础排版与页面过渡
/* -------------------------------------------------------------------------- */
body {
    /* 优先使用系统字体栈，确保极速渲染 */
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: #333333;
    background-color: #ffffff;
    /* 页面加载淡入效果 */
    opacity: 0;
    transition: opacity 0.4s ease-in-out;
    overflow-x: hidden;
}

body.loaded {
    opacity: 1;
}

/* -------------------------------------------------------------------------- */
/*  导航交互
/* -------------------------------------------------------------------------- */
.nav-link {
    position: relative;
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

/* 导航下划线动画 */
.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -4px;
    left: 0;
    background-color: #333;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.nav-link:hover {
    color: #000;
}

/* -------------------------------------------------------------------------- */
/*  全屏轮播图 (Hero Carousel)
/* -------------------------------------------------------------------------- */
.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    /* 平滑的淡入淡出过渡 */
    transition: opacity 1.2s ease-in-out;
    z-index: 0;
}

.carousel-slide.active {
    opacity: 1;
    z-index: 10;
}

/* 轮播文字内容的延迟上浮动画 */
.carousel-content {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease 0.4s, transform 0.8s ease 0.4s;
}

.carousel-slide.active .carousel-content {
    opacity: 1;
    transform: translateY(0);
}

/* -------------------------------------------------------------------------- */
/*  图片交互效果
/* -------------------------------------------------------------------------- */
/* 图片容器：必须设置 overflow hidden 才能实现内部放大不溢出 */
.img-hover-container {
    position: relative;
    overflow: hidden;
    display: block;
}

/* 图片缩放与阴影 */
.img-hover-zoom {
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), filter 0.3s ease;
    width: 100%;
    height: 100%;
    object-fit: cover;
    will-change: transform; /* 性能优化 */
}

.img-hover-container:hover .img-hover-zoom {
    transform: scale(1.03);
}

/* 图片上的半透明遮罩层 */
.hover-overlay {
    background: rgba(255, 255, 255, 0.85);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.img-hover-container:hover .hover-overlay {
    opacity: 1;
}

/* -------------------------------------------------------------------------- */
/*  滚动动画 (Scroll Reveal)
/* -------------------------------------------------------------------------- */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    will-change: opacity, transform;
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 动画延迟辅助类 */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }

/* -------------------------------------------------------------------------- */
/*  移动端适配
/* -------------------------------------------------------------------------- */
.mobile-menu {
    transition: transform 0.3s ease-in-out;
    transform: translateX(100%);
    z-index: 50;
}

.mobile-menu.open {
    transform: translateX(0);
}

/* -------------------------------------------------------------------------- */
/*  工具样式
/* -------------------------------------------------------------------------- */
/* 隐藏横向滚动条但保留滚动功能 */
.hide-scrollbar::-webkit-scrollbar {
    display: none;
}
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* 极简滚动条样式 (针对非 hide-scrollbar 区域) */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #e5e7eb;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #d1d5db;
}

/* 视差背景辅助 */
.parallax-bg {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

@media (max-width: 768px) {
    /* 移动端禁用视差以提升性能 */
    .parallax-bg {
        background-attachment: scroll;
    }
}