:root {
    --primary: #1998ff;
    --dark: #23282d;
    --gray: #6c757d;
    --light-gray: #adb5bd;
    --border: #eaeaea;
    --bg: #f8f9fa;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --box-shadow: 0 2px 10px var(--shadow-color);
    --border-radius: 10px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--dark);
    background-color: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: color 0.3s ease;
}



img {
    max-width: 100%;
}

button, .btn {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    font-size: inherit;
}

ul, ol {
    list-style-position: inside;
}

/* 背景装饰元素 */
.bg-decoration {
    position: fixed;
    border-radius: 50%;
    z-index: -1;
    opacity: 0.5;
}

.bg-circle-1 {
    width: 300px;
    height: 300px;
    background: linear-gradient(45deg, rgba(25, 152, 255, 0.05), rgba(110, 143, 250, 0.05));
    top: -100px;
    right: -100px;
    animation: float 15s infinite alternate ease-in-out;
}

.bg-circle-2 {
    width: 500px;
    height: 500px;
    background: linear-gradient(45deg, rgba(94, 214, 179, 0.05), rgba(255, 173, 0, 0.05));
    bottom: -200px;
    left: -200px;
    animation: float 20s infinite alternate-reverse ease-in-out;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(20px, 20px);
    }
}

/* 辅助类 */
.text-primary { color: var(--primary); }
.text-dark { color: var(--dark); }
.text-gray { color: var(--gray); }
.text-center { text-align: center; }
.fw-bold { font-weight: 700; }
.fw-medium { font-weight: 500; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.space-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-10 { gap: 10px; }
.gap-15 { gap: 15px; }
.gap-20 { gap: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-15 { margin-bottom: 15px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }