/* --- 核心变量 --- */
:root {
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* --- 基础设置 --- */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', "PingFang SC", "Microsoft YaHei", sans-serif;
    overflow-x: hidden;
    background-color: #000;
    color: white;
}

/* --- 动态背景层 --- */
#bg-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -999;

    /* 背景图填充模式 */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;


    transform: scale(1.1);
    filter: blur(25px) brightness(0.7);

    /* 动画过渡 */
    transition: opacity 1s ease-in-out;
    will-change: transform;

    /* hack: 有些移动端浏览器需要这个属性来锁定背景
       虽然 div 已经是 fixed 了，但这能作为双重保险
    */
    pointer-events: none;
}

/* --- 标题样式 --- */
.hero-title {
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(180deg, rgba(255,255,255,1) 0%, rgba(255,255,255,0.7) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 20px rgba(0,0,0,0.25));
}


.apple-card {
    background: var(--glass-bg);

    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    box-shadow: var(--glass-shadow);

    position: relative;
    overflow: hidden;


    transform-style: preserve-3d;
    /* 注意：这里不需要父级 perspective，JS 会给 transform 加上 perspective() */
    transition: transform 0.1s;
    cursor: pointer;
    will-change: transform;
}


.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    box-shadow: var(--glass-shadow);
    position: relative;
    overflow: hidden;
    padding: 2rem;
}


.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        800px circle at var(--mouse-x) var(--mouse-y),
        rgba(255, 255, 255, 0.15),
        transparent 40%
    );
    opacity: 0;
    transition: opacity 0.5s;
    pointer-events: none;
    z-index: 2;
}

.apple-card:hover .card-glow,
.glass-panel:hover .card-glow {
    opacity: 1;
}

.card-border-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        600px circle at var(--mouse-x) var(--mouse-y),
        rgba(255, 255, 255, 0.4),
        transparent 40%
    );
    opacity: 0;
    z-index: 3;
    pointer-events: none;
    border-radius: 28px;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    padding: 1px;
}

.apple-card:hover .card-border-glow,
.glass-panel:hover .card-border-glow {
    opacity: 1;
}

/* --- 底部 ICP --- */
.icp-footer {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
    transition: color 0.3s;
}
.icp-footer:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* --- 动画类 --- */
@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.animate-fade-in { animation: fadeIn 1.2s ease-out forwards; }

/* 隐藏滚动条 */
::-webkit-scrollbar { display: none; }