/**
 * 首页专属样式
 */

/* ========== 第一层：初始全屏背景 ========== */
.hero-fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-image: url('back.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.8s ease, visibility 0.8s ease, transform 0.8s ease;
}

.hero-fullscreen::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.hero-fullscreen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: scale(1.05);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    padding: 2rem;
    max-width: 600px;
}

.hero-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid white;
    margin: 0 auto 1.5rem;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-fullscreen h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-fullscreen p {
    font-size: 1.2rem;
    opacity: 0.95;
    margin-bottom: 2rem;
}

.scroll-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: white;
    opacity: 0.8;
    animation: bounce 2s infinite;
    cursor: pointer;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(10px);
    }
}

/* ========== 第二层：内容区域固定背景 ========== */
.content-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%),
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23667eea' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    background-size: cover;
    background-attachment: fixed;
    z-index: -1;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.content-background.visible {
    opacity: 1;
    visibility: visible;
}

/* ========== 主内容区域 ========== */
.main-content {
    min-height: calc(100vh - 100px);
    padding-bottom: 3rem;
}

.section-title {
    font-size: 1.8rem;
    color: #2d3748;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e2e8f0;
}

.articles-grid {
    display: grid;
    gap: 1.5rem;
}

.article-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    display: block;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.article-cover {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-content {
    padding: 1.5rem;
}

.article-title {
    font-size: 1.3rem;
    color: #2d3748;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.article-excerpt {
    color: #718096;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: #a0aec0;
}

.category-badge {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
}

/* 空状态 */
.empty-state {
    background: white;
    border-radius: 15px;
    padding: 4rem 2rem;
    text-align: center;
    color: #718096;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* ========== 主布局动画 ========== */
.layout-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 0.8s ease, transform 0.8s ease;
    pointer-events: none;
}

.layout-container.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 滚动解锁 后切换为普通流 */
.layout-container.unlocked {
    position: static;
    height: auto;
    overflow-y: visible;
    pointer-events: auto;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {

    .hero-fullscreen h1 {
        font-size: 1.8rem;
    }

    .hero-fullscreen p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .article-title {
        font-size: 1.1rem;
    }
}