/* ---------- 全局 ---------- */
body {
    margin: 0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    /* 核心修复：背景图全屏显示，替换了原来的green纯色 */
    background: url('./bg.jpg') no-repeat center center fixed;
    background-size: cover;
    background-color: #000; /* 兜底背景色，图片加载时不会空白 */
    color: #fff;
    overflow-x: hidden;
    position: relative;
}
/* ---------- 烟雾效果 ---------- */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, rgba(0,0,0,0) 70%);
    opacity: 0.2;
    pointer-events: none;
    animation: smoke 60s linear infinite;
    z-index: 0;
}
@keyframes smoke {
    0% { transform: translate(0,0) rotate(0deg); }
    50% { transform: translate(-50px,50px) rotate(180deg); }
    100% { transform: translate(0,0) rotate(360deg); }
}
/* ---------- 标题和文字动画 ---------- */
@keyframes float { 0%{transform:translateY(0);}50%{transform:translateY(-10px);}100%{transform:translateY(0);} }
.floating { animation: float 4s ease-in-out infinite; }
@keyframes floatText { 0%{transform:translateY(0);}50%{transform:translateY(-5px);}100%{transform:translateY(0);} }
.floating-text { animation: floatText 6s ease-in-out infinite; }
/* ---------- 头部 ---------- */
header {
    background-color: rgba(0,0,0,0.7);
    padding: 20px;
    text-align: center;
    position: relative;
    z-index: 1;
}
header h1 { font-size: 3em; margin: 0; text-shadow: 2px 2px #000; }
nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 10px;
    flex-wrap: wrap;
}
nav a {
    color: gold;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
}
nav a:hover { color: #fff; text-shadow: 0 0 10px gold; }
/* ---------- 主体 ---------- */
main {
    padding: 40px;
    max-width: 900px;
    margin: 50px auto;
    background-color: rgba(0,0,0,0.6);
    border-radius: 15px;
    box-shadow: 0 0 30px #000;
    position: relative;
    z-index: 1;
}
section { margin-bottom: 30px; }
h2 { border-bottom: 2px solid gold; display: inline-block; padding-bottom: 5px; }
.news ul { padding-left: 20px; }
.news li { margin-bottom: 10px; }
/* ---------- 按钮 ---------- */
button.glow-button {
    background-color: gold;
    color: black;
    font-weight: bold;
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 0 5px gold;
    transition: 0.3s;
}
button.glow-button:hover {
    box-shadow: 0 0 20px orange;
    transform: scale(1.1);
}
/* ---------- 页脚 ---------- */
footer {
    text-align: center;
    padding: 20px;
    background-color: rgba(0,0,0,0.7);
    position: relative;
    z-index: 1;
}
/* ---------- 流星 ---------- */
.meteor {
    position: fixed;
    width: 3px;
    height: 80px;
    background: linear-gradient(to bottom, white, rgba(255,255,255,0));
    top: -100px;
    left: 80%;
    opacity: 0.8;
    transform: rotate(45deg);
    animation: meteor 3s linear infinite;
    z-index: 0;
}
@keyframes meteor {
    0% { top: -100px; left: 80%; opacity: 0; }
    10% { opacity: 1; }
    100% { top: 100vh; left: 20%; opacity: 0; }
}
/* ---------- 落叶 ---------- */
.leaf {
    position: fixed;
    width: 30px;
    height: 30px;
    /* 修复：国内可访问的稳定落叶图片链接，替换了原来的imgur外链 */
    background: url('https://picsum.photos/id/106/30/30') no-repeat center center;
    background-size: contain;
    opacity: 0.6;
    z-index: 0;
}
.leaf1 { left: 10%; top: -50px; animation: leafFall 15s linear infinite; }
.leaf2 { left: 50%; top: -50px; animation: leafFall 20s linear infinite; }
.leaf3 { left: 80%; top: -50px; animation: leafFall 18s linear infinite; }
@keyframes leafFall {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(50vh) rotate(180deg); }
    100% { transform: translateY(100vh) rotate(360deg); }
}