/* ============================================================
   文件: static/css/nav.css
   说明: 全局顶部导航样式（完全透明 + 极淡边框）
   ============================================================ */

/* ========== 顶部导航栏 - 完全透明 ========== */
.top-nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: 1px solid rgba(212, 175, 55, 0.35);  /* 极淡边框 */
    box-shadow: none;
    padding: 15px 0;
}

/* 导航内部容器 */
.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

/* 导航链接按钮 */
.nav-btn {
    color: #e2bc6c;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    background: rgba(0, 0, 0, 0.15);
    padding: 8px 24px;
    border-radius: 30px;
    border: 1px solid rgba(212, 175, 55, 0.15);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'Inter', sans-serif;
    white-space: nowrap;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.nav-btn i {
    font-size: 1rem;
}

.nav-btn:hover {
    color: #ffdf99;
    background: rgba(30, 40, 60, 0.25);
    border-color: rgba(212, 175, 55, 0.4);
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.08);
    transform: translateY(-2px);
}

.nav-btn.active {
    color: #ffdf99;
    background: rgba(212, 175, 55, 0.08);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.05);
}

/* 给页面主体添加上边距 */
body {
    padding-top: 75px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .top-nav-bar {
        padding: 12px 0;
    }
    .nav-container {
        gap: 1rem;
        padding: 0 1rem;
    }
    .nav-btn {
        font-size: 0.8rem;
        padding: 6px 16px;
        background: rgba(0, 0, 0, 0.2);
    }
    .nav-btn i {
        font-size: 0.85rem;
    }
    body {
        padding-top: 68px;
    }
}

@media (max-width: 500px) {
    .top-nav-bar {
        padding: 10px 0;
        border-bottom: 1px solid rgba(212, 175, 55, 0.05);
    }
    .nav-container {
        gap: 0.6rem;
        padding: 0 0.8rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    .nav-btn {
        font-size: 0.7rem;
        padding: 5px 12px;
        gap: 4px;
        background: rgba(0, 0, 0, 0.25);
    }
    .nav-btn i {
        font-size: 0.7rem;
    }
    body {
        padding-top: 62px;
    }
}

@media (max-width: 380px) {
    .top-nav-bar {
        padding: 8px 0;
        border-bottom: 1px solid rgba(212, 175, 55, 0.03);
    }
    .nav-container {
        gap: 0.4rem;
        padding: 0 0.5rem;
    }
    .nav-btn {
        font-size: 0.6rem;
        padding: 4px 10px;
        gap: 3px;
        background: rgba(0, 0, 0, 0.3);
    }
    .nav-btn i {
        font-size: 0.6rem;
    }
    body {
        padding-top: 55px;
    }
}