/* ========================================
   Premium Effects - 高端效果增强
   ======================================== */

/* 磁性按钮效果 */
.magnetic-btn {
    position: relative;
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.magnetic-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.magnetic-btn:hover::before {
    width: 300px;
    height: 300px;
}

.magnetic-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(30, 64, 175, 0.3);
}

/* 毛玻璃卡片 */
.glass-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(30px) saturate(200%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* 渐变文字 */
.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 淡入动画 */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

/* 滚动进度条 */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    z-index: 10000;
    width: 0%;
    transition: width 0.1s;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 导航链接下划线动画 */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after {
    width: 100%;
}

/* 下拉菜单平滑显示 */
.dropdown {
    transform: translateY(10px);
    opacity: 0;
}

.nav-item:hover .dropdown {
    transform: translateY(0);
    opacity: 1;
}

/* SVG 波浪分隔线 */
.wave-divider {
    width: 100%;
    height: 60px;
    margin: 0;
    position: absolute;
    bottom: 0;
    left: 0;
}

.wave-divider svg {
    width: 100%;
    height: 100%;
}

/* 懒加载图片淡入 */
img[loading= lazy], img[data-src] {
    opacity: 0;
    transition: opacity 0.5s ease;
}

img.loaded {
    opacity: 1;
}

/* 主题切换支持 */
[data-theme=dark] {
    --text-dark: #f8f9fa;
    --text-light: #adb5bd;
    --bg-light: #1a1f2e;
    --white: #2d3748;
}

/* 统计卡片增强 */
.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(30,64,175,0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.5s;
}

.stat-card:hover::before {
    opacity: 1;
}