/* 
 * 字体配置 
 * 英文优先使用 Helvetica Neue，中文使用思源黑体（Source Han Sans CN）或系统默认黑体
 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@100;300;400;500;700&display=swap');

:root {
    --color-deep-space-black: #0F0F0F;
    --color-premium-gray: #F5F5F5;
    --color-pure-white: #FFFFFF;
    --color-cement-gray: #CCCCCC;
    --color-clay-brown: #8D6E63;
}

body {
    font-family: "Helvetica Neue", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--color-premium-gray);
    color: var(--color-deep-space-black);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* 导航栏样式增强 */
.nav-link {
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -4px;
    left: 0;
    background-color: var(--color-deep-space-black);
    transition: width 0.3s ease;
}

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

/* 图片交互效果：极其细微的放大与缓动 */
.img-hover-effect {
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94), filter 0.5s ease;
    will-change: transform;
}

.img-hover-effect:hover {
    transform: scale(1.02);
    /* 增加轻微的亮度和对比度提升质感 */
    filter: brightness(1.02) contrast(1.02); 
}

/* 视差滚动容器 */
.parallax-container {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}

/* 隐藏滚动条但保留功能 (Chrome/Safari/Webkit) */
::-webkit-scrollbar {
    width: 6px;
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(15, 15, 15, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(15, 15, 15, 0.5);
}

/* 文字排版优化 */
h1, h2, h3, h4, h5, h6 {
    letter-spacing: -0.02em;
}

p {
    line-height: 1.8;
    letter-spacing: 0.02em;
}

/* 视频背景遮罩 */
.video-overlay-gradient {
    background: linear-gradient(to bottom, rgba(15,15,15,0.3) 0%, rgba(15,15,15,0.1) 50%, rgba(15,15,15,0.4) 100%);
}

/* 极简加载状态 */
.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 陶土棕点缀 - 仅用于特定交互 */
.accent-hover:hover {
    color: var(--color-clay-brown);
}

/* 横向滚动容器隐藏滚动条 */
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.hide-scrollbar::-webkit-scrollbar {
    display: none;
}