/* ========================================
   navbar.css — 导航栏组件样式
   ======================================== */

/* ---------- 导航栏 ---------- */
.navbar {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 12px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 999;
    transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

/* ---------- 容器 ---------- */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ---------- Logo ---------- */
.nav-brand {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.35rem;
    font-weight: 700;
    color: #1e1e2a;
    letter-spacing: 1px;
}
.nav-brand:hover {
    color: #4a6cf7;
}

/* ---------- 菜单 ---------- */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-menu > li > a,
.nav-menu .dropbtn {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 40px;
    font-size: 0.95rem;
    font-weight: 500;
    color: #4a4a5a;
    transition: all 0.25s ease;
}

.nav-menu > li > a:hover,
.nav-menu .dropbtn:hover {
    background-color: rgba(0, 0, 0, 0.04);
    color: #1e1e2a;
}

.nav-menu > li > a.active {
    color: #fafaf8;
    background-color: #1e1e2a;
}

/* ---------- 分享按钮 ---------- */
.nav-menu .dropbtn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    line-height: normal;
    appearance: none;
    -webkit-appearance: none;
}

.nav-menu .dropbtn i {
    margin-left: 6px;
    font-size: 0.75rem;
    transition: transform 0.25s ease;
}

.dropdown.active .dropbtn i {
    transform: rotate(180deg);
}

/* ---------- 下拉菜单 ---------- */
.nav-menu .dropdown {
    position: relative;
}

.nav-menu .dropdown-content {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    min-width: 130px;
    padding: 8px 0;
    margin: 0;
    list-style: none;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
    border: 1px solid rgba(0, 0, 0, 0.04);
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

.nav-menu .dropdown-content.open {
    visibility: visible;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.nav-menu .dropdown-content li a {
    display: block;
    padding: 8px 20px;
    text-align: center;
    white-space: nowrap;
    border-radius: 0;
    color: #4a4a5a;
    transition: all 0.15s ease;
}
.nav-menu .dropdown-content li a:hover {
    color: #4a6cf7;
    background-color: rgba(74, 108, 247, 0.06);
}

/* ---------- 汉堡按钮 ---------- */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: #1e1e2a;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}
.nav-toggle:hover {
    background-color: rgba(0, 0, 0, 0.04);
}

/* ---------- 移动端 ---------- */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
    }

    .nav-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 16px 0;
        gap: 4px;
        background-color: #ffffff;
        border-top: 1px solid rgba(0, 0, 0, 0.04);
        margin-top: 12px;
    }
    .nav-menu.open {
        display: flex;
    }

    .nav-menu > li > a,
    .nav-menu .dropbtn {
        display: block;
        width: 100%;
        text-align: center;
        padding: 10px 16px;
        border-radius: 8px;
    }

    .nav-menu .dropdown {
        width: 100%;
    }

    .nav-menu .dropdown-content {
        position: static;
        transform: none;
        width: auto;
        margin: 5px 12px;
        box-shadow: none;
        background: #f8f8f6;
        border: none;
        visibility: visible;
        opacity: 1;
        display: none;
        transition: none;
    }
    .nav-menu .dropdown-content.open {
        display: block;
        transform: none;
    }

    .nav-menu .dropdown-content li a {
        white-space: normal;
        padding: 10px 16px;
        border-radius: 4px;
    }
}