/* public/styles.css */

/* 字体引入：思源黑体与无衬线字体栈 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@100;300;400;500&display=swap');

/* 全局基础设置 */
:root {
    --transition-speed: 0.5s;
    --color-bg: #ffffff;
    --color-text: #2c2c2c;
}

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, 'Noto Sans SC', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--color-bg);
    color: var(--color-text);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    line-height: 1.6;
}

/* 核心交互动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes revealImage {
    from { opacity: 0; filter: blur(10px); transform: scale(1.02); }
    to { opacity: 1; filter: blur(0); transform: scale(1); }
}

/* 实用动画类 - 配合 JS 或 HTML 使用 */
.animate-fade-in {
    animation: fadeIn 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    opacity: 0; /* 初始状态 */
}

.animate-slide-up {
    animation: slideUp 0.8s ease-out forwards;
    opacity: 0;
}

.animate-reveal {
    animation: revealImage 1.2s ease-out forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-500 { animation-delay: 0.5s; }

/* 导航栏交互细节 */
.nav-item {
    position: relative;
    display: inline-block;
    transition: color 0.3s ease;
    text-decoration: none;
}

.nav-item::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    display: block;
    bottom: -2px;
    right: 0;
    background: currentColor;
    transition: width 0.3s ease;
}

.nav-item:hover::after,
.nav-item.active::after {
    width: 100%;
    left: 0;
}

/* 图片容器通用样式 */
.img-container {
    overflow: hidden;
    background-color: #f5f5f5; /* 优雅的占位色 */
    position: relative;
}

.img-zoom-hover {
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

/* 极简滚动条 */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #d1d1d1;
    border-radius: 2px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* 动态内容槽位 - 保持布局稳定性 */
.slot-placeholder:empty {
    display: none;
}

/* 移动端菜单过渡 */
#mobile-menu {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: top;
    overflow: hidden;
}

/* 文字排版增强 */
.font-light-custom {
    font-weight: 300;
    letter-spacing: 0.05em;
}

/* 消除Pico.css可能带来的默认边距干扰 */
.reset-margin {
    margin-bottom: 0 !important;
}