/* 
 * 全局样式文件 - 极简现代风格
 * 遵循设计约束：黑白灰主色调，Helvetica Neue + 思源黑体
 */

/* 字体定义 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
    --color-primary: #1a1a1a;
    --color-secondary: #4a4a4a;
    --color-accent: #6b7280;
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
}

body {
    font-family: 'Helvetica Neue', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--color-primary);
    background-color: var(--color-bg);
    line-height: 1.6;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #d1d5db; /* Tailwind gray-300 */
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #9ca3af; /* Tailwind gray-400 */
}

/* 文本选区 */
::selection {
    background: var(--color-primary);
    color: var(--color-bg);
}

/* 辅助动画类 */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease-out 0.2s 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; }

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* 图片交互效果 */
.group:hover .hover-zoom {
    transform: scale(1.03);
}

.hover-zoom {
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: transform;
}

/* 导航链接动效 */
.nav-link {
    position: relative;
    display: inline-block;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 100%;
    transform: scaleX(0);
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: currentColor;
    transform-origin: bottom right;
    transition: transform 0.3s ease-out;
}

.nav-link:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* 网格布局辅助 */
.masonry-grid {
    column-count: 1;
    column-gap: 1.5rem;
}
@media (min-width: 640px) {
    .masonry-grid { column-count: 2; }
}
@media (min-width: 1024px) {
    .masonry-grid { column-count: 3; }
}

.masonry-item {
    break-inside: avoid;
    margin-bottom: 1.5rem;
}

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

p {
    letter-spacing: 0.01em;
}

/* 隐藏元素的类 (用于Vue切换等) */
[v-cloak] {
    display: none;
}