/* 导航栏样式 - 所有页面统一使用 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: #fff;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    transition: box-shadow 0.3s;
    z-index: 1030;
    width: 100%;
    min-height: 76px; /* 固定navbar高度，防止CLS */
}

.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container { max-width: 540px; }
}

@media (min-width: 768px) {
    .container { max-width: 720px; }
}

@media (min-width: 992px) {
    .container { max-width: 960px; }
}

@media (min-width: 1200px) {
    .container { max-width: 1140px; }
}

.navbar-brand {
    display: inline-block;
    padding-top: 0.3125rem;
    padding-bottom: 0.3125rem;
    margin-right: 1rem;
    font-size: 1.25rem;
    line-height: inherit;
    white-space: nowrap;
    text-decoration: none;
}

.navbar-brand img,
.navbar-logo {
    height: 40px;
    width: 150px; /* 固定宽度，防止CLS */
    object-fit: contain;
}

.navbar-toggler {
    padding: 0.25rem 0.75rem;
    font-size: 1.25rem;
    line-height: 1;
    background-color: transparent;
    border: 1px solid rgba(0,0,0,.1);
    border-radius: 0.25rem;
}

.navbar-toggler-icon {
    display: inline-block;
    width: 1.5em;
    height: 1.5em;
    vertical-align: middle;
    content: "";
    background: no-repeat center center;
    background-size: 100% 100%;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 0, 0, 0.5)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-collapse {
    flex-basis: 100%;
    flex-grow: 1;
    align-items: center;
}

.navbar-nav {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.nav-item {
    list-style: none;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    color: #333;
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

.nav-link:hover {
    color: #12c2e9;
}

@media (min-width: 992px) {
    .navbar-expand-lg {
        flex-flow: row nowrap;
        justify-content: flex-start;
    }

    .navbar-expand-lg .navbar-nav {
        flex-direction: row;
    }

    .navbar-expand-lg .navbar-nav .nav-link {
        padding-right: 0.5rem;
        padding-left: 0.5rem;
    }

    .navbar-expand-lg .navbar-collapse {
        display: flex !important;
        flex-basis: auto;
    }

    .navbar-expand-lg .navbar-toggler {
        display: none;
    }
}

.ml-auto {
    margin-left: auto !important;
}

.collapse:not(.show) {
    display: none;
}

.nav-link {
    color: #555 !important;
    font-weight: 500;
    margin: 0 10px;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #667eea !important;
}

.nav-link.active {
    color: #667eea !important;
    font-weight: 600;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar {
        padding: 10px 0;
        width: 100% !important;
        max-width: 100% !important;
        min-height: 66px; /* 移动端固定高度 */
    }

    .navbar .container {
        padding-left: 12px;
        padding-right: 12px;
        width: 100% !important;
        max-width: 100% !important;
    }

    .navbar-brand {
        font-size: 18px;
        max-width: calc(100% - 60px);
    }

    .navbar-logo {
        height: 32px;
        width: 120px; /* 移动端固定宽度 */
        max-width: 150px;
    }

    .navbar-toggler {
        border: 1px solid rgba(0,0,0,.1);
        padding: 6px 10px;
    }

    .navbar-collapse {
        background: #fff;
        padding: 15px;
        margin-top: 10px;
        border-radius: 10px;
        box-shadow: 0 5px 20px rgba(0,0,0,0.1);
        width: 100%;
        max-width: 100%;
    }

    .nav-link {
        padding: 10px 0 !important;
        margin: 0 !important;
    }
}