:root {
    --primary: #0F4C9E;
    --primary-light: #2563EB;
    --accent: #22D3EE;
    --accent-purple: #8B5CF6;
    --accent-pink: #EC4899;
    --gold: #F59E0B;
    --bg-dark: #050B1A;
    --bg-card: rgba(15, 32, 62, 0.7);
    --gradient-blue: linear-gradient(135deg, #0F4C9E 0%, #22D3EE 100%);
    --gradient-purple: linear-gradient(135deg, #7C3AED 0%, #EC4899 100%);
    --gradient-gold: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: #E2E8F0;
    overflow-x: hidden;
    line-height: 1.6;
}
/* 电路纹理背景 */
.circuit-bg {
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}
/* 霓虹导航 */
.nav-neon {
    box-shadow: 0 4px 30px rgba(15, 76, 158, 0.2);
}
.nav-link {
    position: relative;
    transition: all 0.15s ease;
    padding: 0.5rem 0;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    width: 0; height: 2px;
    background: var(--gradient-blue);
    transition: all 0.15s ease;
    transform: translateX(-50%);
    box-shadow: 0 0 10px rgba(34, 211, 238, 0.5);
}
.nav-link:hover, .nav-link.active {
    color: var(--accent) !important;
    text-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
}
.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}
/* 按钮 */
.btn-primary {
    background: var(--gradient-blue);
    color: white;
    padding: 0.75rem 1.75rem;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
}
.btn-primary::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.5);
}
.btn-outline {
    background: transparent;
    color: var(--accent);
    padding: 0.75rem 1.75rem;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(34, 211, 238, 0.4);
    cursor: pointer;
}
.btn-outline:hover {
    background: rgba(34, 211, 238, 0.1);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.2);
}
/* 渐变文字 */
.gradient-text {
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
/* 数据流动画 */
.data-flow {
    background: linear-gradient(90deg, #22D3EE, #8B5CF6, #EC4899, #22D3EE);
    background-size: 300% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: dataFlow 4s linear infinite;
}
@keyframes dataFlow {
    0% { background-position: 0% center; }
    100% { background-position: 300% center; }
}
/* 玻璃拟态卡片 */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(37, 99, 235, 0.15);
    border-radius: 1rem;
    transition: all 0.15s ease;
}
.glass-card:hover {
    border-color: rgba(34, 211, 238, 0.4);
    transform: translateY(-4px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 30px rgba(34, 211, 238, 0.1);
}
/* 渐变边框卡片 */
.gradient-border-card {
    position: relative;
    background: linear-gradient(135deg, rgba(15, 32, 62, 0.9) 0%, rgba(20, 42, 82, 0.85) 100%);
    border-radius: 1rem;
    z-index: 1;
}
.gradient-border-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 1rem;
    padding: 1px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.6), rgba(34, 211, 238, 0.4), rgba(139, 92, 246, 0.3));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}
/* HUD科技角标 */
.hud-corner {
    position: relative;
}
.hud-corner::before, .hud-corner::after {
    content: '';
    position: absolute;
    width: 24px; height: 24px;
    border-color: var(--accent);
    border-style: solid;
    opacity: 0.7;
    transition: all 0.15s ease;
    z-index: 2;
}
.hud-corner::before {
    top: -1px; left: -1px;
    border-width: 2px 0 0 2px;
    border-radius: 8px 0 0 0;
}
.hud-corner::after {
    bottom: -1px; right: -1px;
    border-width: 0 2px 2px 0;
    border-radius: 0 0 8px 0;
}
.hud-corner:hover::before, .hud-corner:hover::after {
    width: 32px; height: 32px;
    opacity: 1;
    box-shadow: 0 0 15px rgba(34, 211, 238, 0.4);
}
/* 扫描线动画 */
.scan-line {
    position: relative;
    overflow: hidden;
}
@keyframes scanMove {
    0% { top: -100%; }
    100% { top: 100%; }
}
/* 发光文字 */
.glow-text {
    text-shadow: 0 0 30px rgba(34, 211, 238, 0.4), 0 0 60px rgba(34, 211, 238, 0.2);
}
/* 入场动画 */
.anim-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}
.anim-fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}
.anim-fade-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.6s ease-out;
}
.anim-fade-left.visible {
    opacity: 1;
    transform: translateX(0);
}
.anim-fade-right {
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.6s ease-out;
}
.anim-fade-right.visible {
    opacity: 1;
    transform: translateX(0);
}
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
/* 博客卡片 */
.blog-card {
    position: relative;
    overflow: hidden;
    transition: all 0.15s ease;
}
.blog-card:hover {
    transform: translateY(-6px);
}
.blog-cover {
    position: relative;
    overflow: hidden;
    height: 200px;
}
.blog-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}
.blog-cover .cover-gradient {
    width: 100%; height: 100%;
    transition: transform 0.3s ease;
}
.blog-card:hover .cover-gradient,
.blog-card:hover .blog-cover img {
    transform: scale(1.08);
}
.blog-cover-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(5, 11, 26, 0.95) 100%);
}
/* 分类标签 */
.category-tag {
    position: absolute;
    top: 1rem; left: 1rem;
    padding: 0.35rem 0.875rem;
    background: rgba(15, 76, 158, 0.9);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(34, 211, 238, 0.4);
    border-radius: 0.5rem;
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 600;
    z-index: 2;
    box-shadow: 0 0 15px rgba(34, 211, 238, 0.2);
}
/* 分类筛选按钮 */
.filter-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.15s ease;
    cursor: pointer;
    border: 1px solid rgba(37, 99, 235, 0.25);
    background: rgba(15, 32, 62, 0.5);
    color: #94A3B8;
}
.filter-btn:hover, .filter-btn.active {
    background: var(--gradient-blue);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(37, 99, 235, 0.4);
}
/* 搜索框 */
.search-box {
    position: relative;
    max-width: 560px;
    margin: 0 auto;
}
.search-box input {
    width: 100%;
    padding: 1.1rem 1.25rem 1.1rem 3.5rem;
    background: rgba(15, 32, 62, 0.7);
    border: 1px solid rgba(37, 99, 235, 0.3);
    border-radius: 1rem;
    color: white;
    font-size: 1rem;
    transition: all 0.15s ease;
    outline: none;
    backdrop-filter: blur(10px);
}
.search-box input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15), 0 0 30px rgba(34, 211, 238, 0.15);
}
.search-box input::placeholder {
    color: #64748B;
}
.search-box .search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    font-size: 1.1rem;
}
/* 热门文章 */
.hot-item {
    display: flex;
    gap: 1rem;
    padding: 0.875rem 0;
    border-bottom: 1px solid rgba(37, 99, 235, 0.12);
    transition: all 0.15s ease;
    cursor: pointer;
}
.hot-item:last-child { border-bottom: none; }
.hot-item:hover {
    padding-left: 0.5rem;
    background: rgba(34, 211, 238, 0.03);
}
.hot-item:hover .hot-title {
    color: var(--accent);
}
.hot-rank {
    flex-shrink: 0;
    width: 30px; height: 30px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
}
.hot-rank.top1 { background: linear-gradient(135deg, #F59E0B, #FBBF24); color: #78350F; box-shadow: 0 0 15px rgba(245, 158, 11, 0.4); }
.hot-rank.top2 { background: linear-gradient(135deg, #94A3B8, #CBD5E1); color: #334155; }
.hot-rank.top3 { background: linear-gradient(135deg, #D97706, #F59E0B); color: #451A03; }
.hot-rank.normal { background: rgba(37, 99, 235, 0.2); color: #60A5FA; border: 1px solid rgba(37, 99, 235, 0.3); }
/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
}
.page-btn {
    width: 44px; height: 44px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: all 0.15s ease;
    cursor: pointer;
    border: 1px solid rgba(37, 99, 235, 0.25);
    background: rgba(15, 32, 62, 0.5);
    color: #94A3B8;
}
.page-btn:hover, .page-btn.active {
    background: var(--gradient-blue);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}
/* 底部导航 */
.footer-nav-col h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}
.footer-nav-col ul {
    list-style: none;
    padding: 0;
}
.footer-nav-col li {
    margin-bottom: 0.625rem;
}
.footer-nav-col a {
    color: #94A3B8;
    font-size: 0.875rem;
    transition: all 0.15s ease;
    text-decoration: none;
}
.footer-nav-col a:hover {
    color: var(--accent);
    padding-left: 4px;
    text-shadow: 0 0 10px rgba(34, 211, 238, 0.3);
}
/* 粒子画布 */
#particles-canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 1;
}
/* HUD数据面板 */
.hud-panel {
    background: linear-gradient(135deg, rgba(15, 32, 62, 0.8) 0%, rgba(20, 42, 82, 0.6) 100%);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    position: relative;
    overflow: hidden;
}
.hud-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--gradient-blue);
}
/* 标签云 */
.tag-cloud-item {
    display: inline-block;
    padding: 0.4rem 0.875rem;
    border-radius: 0.5rem;
    font-size: 0.8rem;
    transition: all 0.15s ease;
    cursor: pointer;
    border: 1px solid rgba(37, 99, 235, 0.25);
    background: rgba(15, 32, 62, 0.4);
    color: #94A3B8;
}
.tag-cloud-item:hover {
    background: rgba(37, 99, 235, 0.2);
    color: var(--accent);
    border-color: rgba(34, 211, 238, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(34, 211, 238, 0.15);
}
@media (max-width: 768px) {
    .blog-cover { height: 180px; }
    .search-box { max-width: 100%; }
}