/*
 * 手机端底部导航栏 — 全局样式（所有页面均加载）
 * 含 CSS 变量定义，以保证非首页也能正常渲染
 */

/* ── CSS 变量（与 treasure-home.css 保持一致）── */
:root {
    --gold-accent:      #d4af37;
    --dark-gold:        #b8941f;
    --dark-brown:       #3d1f0a;
    --ink-brown:        #2c1810;
    --red-ink:          #9a2a2a;
    --parchment-bg:     #f5e6c8;
    --action-green:     #2d7a3a;
    --parchment-light:  #faf3e0;
    --parchment-border: #d4b896;
    --shadow-color:     rgba(61,31,10,0.15);
}

/* ── 默认隐藏（桌面端不显示）── */
.mobile-bottom-nav {
    display: none;
}

/* ── 手机端显示 ── */
@media (max-width: 768px) {
    /* 为导航栏留底部空间 */
    body { padding-bottom: 70px; }

    .mobile-bottom-nav {
        display: block;
        background: var(--dark-brown);
        border-top: 3px solid var(--gold-accent);
        box-shadow: 0 -4px 10px rgba(0,0,0,0.3);
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        z-index: 1000;
    }
}

/* ── 导航条目布局 ── */
.mobile-nav-items {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0;
    margin: 0;
    list-style: none;
}

.mobile-nav-item {
    color: var(--parchment-bg);
    padding: 8px 5px;
    flex-grow: 1;
    text-align: center;
    text-decoration: none;
    transition: all 0.2s ease;
    font-family: inherit;
}

.mobile-nav-item .nav-icon {
    font-size: 20px;
    display: block;
    line-height: 1.2;
}

.mobile-nav-item .nav-text {
    font-size: 11px;
    display: block;
    margin-top: 2px;
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
    color: var(--gold-accent);
    background: rgba(0,0,0,0.2);
}

/* ── 中间圆形悬浮按钮 ── */
.mobile-nav-item.center-btn {
    background: var(--red-ink);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    margin-top: -25px;
    border: 3px solid var(--gold-accent);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    flex-grow: 0;
    padding: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.mobile-nav-item.center-btn:hover {
    background: #7a2222;
    transform: translateY(-3px);
}

.mobile-nav-item.center-btn .nav-icon {
    font-size: 22px;
    margin-bottom: 0;
}

.mobile-nav-item.center-btn .nav-text {
    font-size: 9px;
    margin-top: 1px;
}

/* ── 未读徽章 ── */
.mobile-nav-item .badge {
    position: absolute;
    top: 4px;
    right: 4px;
    background: var(--red-ink);
    color: #fff;
    border-radius: 50%;
    font-size: 10px;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}