:root {
    --gradient-main: linear-gradient(90deg, #165DFF, #7B61FF);
    --gradient-light: linear-gradient(90deg, #00BFFF, #00FFCC);
    --text-dark: #333;
    --text-gray: #666;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "Microsoft Yahei", sans-serif;
    color: var(--text-dark);
    background-color: #f8f9fa;
}
.navbar {
    background: var(--gradient-main) !important;
    box-shadow: 0 3px 15px rgba(22, 93, 255, 0.25);
}
.navbar-brand {
    font-weight: 600;
    font-size: 1.3rem;
}
.nav-link {
    color: #fff !important;
    transition: 0.3s;
    margin: 0 8px;
}
.nav-link:hover {
    opacity: 0.8;
}
.btn-gradient {
    background: var(--gradient-main);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 8px 22px;
    transition: all 0.3s ease;
}
.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(123, 97, 255, 0.35);
    color: #fff;
}
.card-hover {
    border: none;
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}
.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.12);
}
.float-bar {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 9999;
}
.float-item {
    width: 50px;
    height: 50px;
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 10px 0;
    cursor: pointer;
    font-size: 20px;
    color: #165DFF;
    transition: 0.3s;
}
.float-item:hover {
    background: var(--gradient-main);
    color: #fff;
}
.footer {
    background: #222;
    color: #ccc;
    padding: 40px 0 20px;
    margin-top: 50px;
}
.banner {
    height: 500px;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    color: #fff;
}
.login-box, .reg-box, .find-box {
    max-width: 420px;
    margin: 60px auto;
    padding: 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.1);
}
@media (max-width:768px) {
    .float-bar { right:10px; }
    .float-item { width:44px; height:44px; font-size:18px; }
    .banner { height:300px; }
}