/* 自然极光主题 - 梦幻渐变风格 */
:root {
    --aurora-1: #8e44ad;
    --aurora-2: #3498db;
    --aurora-3: #16a085;
    --aurora-4: #27ae60;
    --dark-bg: #0f172a;
    --light-text: #e2e8f0;
    --semi-transparent: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(15, 23, 42, 0.6);
    --gradient-angle: 135deg;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', 'Helvetica Neue', sans-serif;
}

body {
    background: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.8;
    background-image: 
        radial-gradient(at 80% 20%, var(--semi-transparent) 0px, transparent 50%),
        radial-gradient(at 20% 80%, var(--semi-transparent) 0px, transparent 50%);
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 极光效果头部 */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(15, 23, 42, 0.7);
    border-bottom: 1px solid var(--semi-transparent);
    padding: 1.5rem 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(
        var(--gradient-angle),
        var(--aurora-1),
        var(--aurora-2),
        var(--aurora-3)
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    background-size: 300% 300%;
    animation: gradientShift 12s ease infinite;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links li {
    list-style: none;
    position: relative;
}

.nav-links a {
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-weight: 500;
}

.nav-links a:hover {
    background: var(--semi-transparent);
    transform: translateY(-2px);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--aurora-2), var(--aurora-4));
    transition: all 0.3s;
}

.nav-links a:hover::after {
    width: 60%;
    left: 20%;
}

/* 极光卡片 */
.aurora-card {
    background: var(--card-bg);
    border-radius: 1.5rem;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--semi-transparent);
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.aurora-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        var(--gradient-angle),
        rgba(142, 68, 173, 0.1),
        rgba(52, 152, 219, 0.1),
        rgba(22, 160, 133, 0.1)
    );
    background-size: 300% 300%;
    animation: gradientShift 8s ease infinite;
    z-index: -1;
}

.aurora-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-bottom: 1px solid var(--semi-transparent);
}

.card-content {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    line-height: 1.4;
    background: linear-gradient(
        to right,
        var(--light-text),
        #a5b4fc
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.card-excerpt {
    color: #94a3b8;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #64748b;
}

/* 极光分隔线 */
.section-divider {
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(52, 152, 219, 0.4),
        transparent
    );
    margin: 4rem 0;
    position: relative;
}

.section-divider::after {
    content: '';
    position: absolute;
    top: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--aurora-2);
    box-shadow: 0 0 10px var(--aurora-2), 0 0 20px var(--aurora-2);
}

/* 文章详情页 */
.article-hero {
    text-align: center;
    margin-bottom: 4rem;
}

.article-title {
    font-size: 2.8rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(
        to right,
        var(--light-text),
        #a5b4fc,
        #7dd3fc
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: 1.5rem;
    margin: 2rem 0;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.9;
}

.article-content p {
    margin-bottom: 2rem;
}

/* 极光按钮 */
.aurora-btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 2rem;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
    color: white;
    background: linear-gradient(
        var(--gradient-angle),
        var(--aurora-1),
        var(--aurora-2),
        var(--aurora-3)
    );
    background-size: 300% 300%;
    animation: gradientShift 8s ease infinite;
    transition: all 0.3s;
}

.aurora-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .article-title {
        font-size: 2.2rem;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 1.8rem;
    }
}