/* --- 设计规范与 CSS 变量 --- */
:root {
    /* 色彩方案 - HBO 风格 */
    --color-primary: #FFFFFF; /* HBO 主色调通常是极致的白 */
    --color-accent: #FF0050; /* 霓虹赤红 - Xiaohe Style */
    --color-background: #000000; /* 纯黑背景 */
    --color-surface: #121212; /* 极深灰，用于卡片 */
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B3B3B3; /* 浅灰 */
    --color-border: #333333;
    --color-shadow: rgba(0, 0, 0, 0.8);

    /* 字体排版 - HBO 风格 */
    --font-family-sans: 'Gilroy', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-hero: clamp(3rem, 6vw, 5rem);
    --font-size-h2: 2rem;
    --font-size-h3: 1.125rem;
    --font-size-body: 1rem;
    --font-size-small: 0.8125rem;
    --line-height-body: 1.6;
    --letter-spacing-header: 2px; /* 标题字间距 */

    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 64px;
    --container-padding: 5vw;

    /* 其他 */
    --border-radius: 4px; /* 更锐利的圆角 */
    --transition-fast: 0.2s ease;
    --transition-slow: 0.4s ease;
}

/* --- 全局重置与基础样式 --- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased; /* 字体抗锯齿，更清晰 */
}

a {
    color: var(--color-text-primary);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

a:hover {
    opacity: 0.8;
}

img {
    max-width: 100%;
    display: block;
}

h1, h2, h3 {
    margin: 0;
    font-weight: 800; /* 更粗的字重 */
    line-height: 1.1;
    text-transform: uppercase; /* 全大写 */
    letter-spacing: var(--letter-spacing-header);
}

/* --- 导航栏 --- */
.hbo-navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--container-padding);
    background: linear-gradient(to bottom, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0) 100%); /* 渐变顶部背景 */
    z-index: 1000;
    transition: background-color var(--transition-slow);
}

.hbo-navbar.scrolled {
    background-color: #000000; /* 滚动后纯黑 */
    border-bottom: 1px solid var(--color-border);
}

.nav-left, .nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-logo {
    height: 40px;
    width: auto; /* 保持纵横比 */
    display: block;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-logo:hover {
    transform: scale(1.05); /* 悬停微调放大 */
    opacity: 0.9;
}

.nav-links {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
    gap: var(--space-lg);
}

.nav-links a {
    color: var(--color-text-primary);
    font-weight: 500;
    padding: var(--space-sm) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-fast);
}

.nav-links a:hover::after, .nav-links a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.current-time {
    font-size: var(--font-size-small);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.user-profile {
    width: 36px;
    height: 36px;
    background-color: var(--color-surface);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    border: 2px solid var(--color-border);
}

/* --- Hero 区域 --- */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
    filter: brightness(0.5);
}

.hero-content {
    z-index: 1;
    padding: 0 var(--space-lg);
}

.hero-brand h1 {
    font-size: var(--font-size-hero);
    font-weight: 800;
    text-shadow: 0 4px 20px var(--color-shadow);
}

.hero-subtitle {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
    font-weight: 500;
}

/* --- 主要内容区域 --- */
.main-content {
    padding: var(--space-xxl) var(--container-padding);
}

.content-row {
    margin-bottom: var(--container-padding);
}

.section-title {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-xl);
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: var(--space-md);
    display: inline-block;
}

/* --- 作品/文章卡片通用样式 - HBO 风格 --- */
.media-card, .news-card {
    background-color: var(--color-surface);
    border: 1px solid transparent; /* 默认无边框，但占据空间 */
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: border-color var(--transition-fast), transform var(--transition-fast);
    display: flex;
    flex-direction: column;
    position: relative;
}

.media-card:hover, .news-card:hover {
    transform: translateY(-4px); /* 悬停轻微上浮 */
    border-color: var(--color-primary); /* 悬停高亮白边 */
    box-shadow: none; /* 去除阴影，保持扁平锐利 */
}

/* --- 作品展示 (横向滚动) --- */
.media-scroller {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: clamp(250px, 22%, 350px);
    gap: var(--space-md); /* 减小间距 */
    overflow-x: auto;
    padding: var(--space-xs) var(--space-xs) var(--space-lg) var(--space-xs);
    scrollbar-color: var(--color-border) transparent;
    scrollbar-width: thin;
}

.media-scroller::-webkit-scrollbar {
    height: 6px; /* 更细的滚动条 */
}

.media-scroller::-webkit-scrollbar-track {
    background: transparent;
}

.media-scroller::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.media-card {
    cursor: pointer;
}

.card-image {
    position: relative;
    aspect-ratio: 16 / 9;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: filter var(--transition-fast);
}

.media-card:hover .card-image img {
    filter: brightness(1.1); /* 悬停图片变亮 */
}

.card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.4); /* 简单的遮罩 */
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.media-card:hover .card-overlay {
    opacity: 1;
}

.card-overlay .fas {
    font-size: 48px;
    color: white;
    transform: scale(0.9);
    transition: transform var(--transition-fast);
    border: 2px solid white; /* 播放按钮加边框 */
    border-radius: 50%;
    padding: 16px;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.media-card:hover .card-overlay .fas {
    transform: scale(1);
    background: rgba(0,0,0,0.5);
}

.card-info {
    padding: var(--space-md);
    flex-grow: 1;
    background: linear-gradient(to top, var(--color-surface), transparent);
}

.card-info h3 {
    font-size: var(--font-size-h3);
    font-weight: 700;
    margin-bottom: 4px;
}

.card-info p {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    margin: 0;
    text-transform: uppercase; /* 分类全大写 */
    letter-spacing: 1px;
    font-weight: 600;
}

/* --- 文章/资讯 (网格) --- */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.news-card img {
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.news-content {
    padding: var(--space-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.news-date {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.news-content h3 {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-md);
}

.news-content p {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    line-height: var(--line-height-body);
    flex-grow: 1;
}

/* --- 关于我们 --- */
.about-section {
    padding: var(--container-padding) 0;
    background-color: var(--color-surface);
}

.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--container-padding);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.about-text h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-md);
}

.about-text h3 {
    font-size: var(--font-size-h3);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.about-text p {
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.about-image img {
    border-radius: var(--border-radius);
}

/* --- 底部 --- */
.hbo-footer {
    text-align: center;
    padding: var(--space-xxl) var(--container-padding);
    margin-top: var(--container-padding);
    border-top: 1px solid var(--color-border);
}

.footer-links, .footer-social {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
    padding: 0;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.footer-social .fab {
    font-size: 24px;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-social .fab:hover {
    color: var(--color-primary);
    transform: scale(1.2);
}

.copyright {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

/* --- 视频播放模态框 --- */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    inset: 0;
    background-color: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn var(--transition-slow);
}

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

.modal-content {
    position: relative;
    width: 90%;
    max-width: 1100px;
    animation: zoomIn var(--transition-slow);
}

@keyframes zoomIn {
    from { transform: scale(0.8); }
    to { transform: scale(1); }
}

.close-modal {
    position: absolute;
    top: -48px;
    right: 0;
    color: white;
    font-size: 40px;
    font-weight: 300;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.close-modal:hover {
    transform: rotate(90deg);
}

.video-wrapper {
    position: relative;
    padding-top: 56.25%; /* 16:9 */
    background-color: black;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

#bilibili-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* --- 响应式布局 --- */

/* 平板 & 小尺寸桌面 (<= 1024px) */
@media (max-width: 1024px) {
    :root {
        --container-padding: 32px;
        --font-size-h2: 1.75rem;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .about-image {
        order: -1; /* 将图片移到文字上方 */
    }
}

/* 移动设备 (<= 768px) */
@media (max-width: 768px) {
    :root {
        --container-padding: 24px;
        --font-size-hero: clamp(2rem, 10vw, 3rem);
        --font-size-h2: 1.5rem;
    }

    .hbo-navbar {
        padding: var(--space-sm) var(--container-padding);
    }

    .nav-links {
        display: none; /* 在移动端隐藏导航链接，为汉堡菜单做准备 */
    }

    .main-content {
        padding: var(--space-xl) var(--container-padding);
    }

    .media-scroller {
        grid-auto-columns: clamp(200px, 60%, 280px);
        padding-bottom: var(--space-md);
    }

    .media-grid {
        grid-template-columns: 1fr;
    }

    .about-container {
        padding: 0 var(--container-padding);
    }

    .hbo-footer {
        padding: var(--space-xl) var(--container-padding);
        margin-top: var(--space-xl);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-md);
    }

    .mobile-menu-btn {
        display: block; /* 在移动端显示汉堡按钮 */
    }
}

/* --- 移动端全屏菜单样式 --- */
.mobile-menu-btn {
    display: none; /* 默认隐藏 */
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-sm);
    z-index: 1001;
    transition: color var(--transition-fast);
}

.mobile-menu-btn:hover {
    color: var(--color-accent);
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.98); /* 深邃背景 */
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
}

.mobile-nav-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.close-mobile-nav {
    position: absolute;
    top: 30px;
    right: 30px;
    font-size: 3rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.close-mobile-nav:hover {
    color: var(--color-accent);
    transform: rotate(90deg);
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.mobile-nav-links li {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

/* 依次显示动画 */
.mobile-nav-overlay.active .mobile-nav-links li:nth-child(1) { transition-delay: 0.1s; }
.mobile-nav-overlay.active .mobile-nav-links li:nth-child(2) { transition-delay: 0.2s; }
.mobile-nav-overlay.active .mobile-nav-links li:nth-child(3) { transition-delay: 0.3s; }
.mobile-nav-overlay.active .mobile-nav-links li:nth-child(4) { transition-delay: 0.4s; }

.mobile-nav-overlay.active .mobile-nav-links li {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav-links a {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
}

.mobile-nav-links a::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 100%;
    height: 4px;
    background-color: var(--color-accent);
    transition: transform var(--transition-fast);
}

.mobile-nav-links a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.mobile-nav-links a:hover {
    color: var(--color-accent);
}