/* ==========================================================================
   MARC369 品牌徽标 / brand.css
   由前台公共资源引入；用较高特异性覆盖主题中的旧方块标识。
   墨绿渐变 + 铜金内框与底饰 + 衬线 M，与登录、注册、首页视觉统一。
   ========================================================================== */

.am-brand .am-brand-mark {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 0;
    border-radius: 3px;
    background: linear-gradient(145deg, #2C5546 0%, #1F3D34 46%, #162E26 100%);
    color: #FFFFFF;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: 21px;
    font-weight: 700;
    letter-spacing: -1px;
    line-height: 1;
    text-shadow: 0 1px 2px rgba(0, 0, 0, .24);
    overflow: hidden;
    box-shadow: 0 5px 14px rgba(22, 46, 38, .18);
    transition: transform .35s ease, box-shadow .35s ease;
}
.am-brand .am-brand-mark::before {
    content: "";
    position: absolute;
    inset: 3px;
    border: 1px solid rgba(224, 198, 148, .62);
    border-radius: 2px;
    pointer-events: none;
}
.am-brand .am-brand-mark::after {
    content: "";
    position: absolute;
    left: 10px;
    right: 10px;
    bottom: 5px;
    height: 2px;
    border-radius: 1px;
    background: linear-gradient(90deg, #B88746, #E4D6B8);
    pointer-events: none;
}
.am-header .am-brand .am-brand-mark {
    width: 42px;
    height: 42px;
    font-size: 23px;
}
.am-auth-topbar .am-brand .am-brand-mark {
    background: linear-gradient(145deg, #2C5546 0%, #1F3D34 46%, #162E26 100%);
    color: #FFFFFF;
}
.am-brand:hover .am-brand-mark {
    transform: translateY(-2px) rotate(-4deg);
    box-shadow: 0 9px 20px rgba(22, 46, 38, .26);
}

@media (max-width: 680px) {
    .am-brand .am-brand-mark { width: 36px; height: 36px; font-size: 19px; }
    .am-header .am-brand .am-brand-mark { width: 36px; height: 36px; font-size: 19px; }
}
@media (prefers-reduced-motion: reduce) {
    .am-brand .am-brand-mark,
    .am-brand:hover .am-brand-mark { transition: none; transform: none; }
}