/* Bootstrap基本样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6,
.col-lg-7, .col-lg-8, .col-lg-9, .col-lg-10, .col-lg-11, .col-lg-12,
.col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6,
.col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12 {
    padding: 0 15px;
    flex: 0 0 auto;
}

.col-lg-1 { width: 8.333333%; }
.col-lg-2 { width: 16.666667%; }
.col-lg-3 { width: 25%; }
.col-lg-4 { width: 33.333333%; }
.col-lg-5 { width: 41.666667%; }
.col-lg-6 { width: 50%; }
.col-lg-7 { width: 58.333333%; }
.col-lg-8 { width: 66.666667%; }
.col-lg-9 { width: 75%; }
.col-lg-10 { width: 83.333333%; }
.col-lg-11 { width: 91.666667%; }
.col-lg-12 { width: 100%; }

@media (max-width: 991.98px) {
    .col-md-1 { width: 8.333333%; }
    .col-md-2 { width: 16.666667%; }
    .col-md-3 { width: 25%; }
    .col-md-4 { width: 33.333333%; }
    .col-md-5 { width: 41.666667%; }
    .col-md-6 { width: 50%; }
    .col-md-7 { width: 58.333333%; }
    .col-md-8 { width: 66.666667%; }
    .col-md-9 { width: 75%; }
    .col-md-10 { width: 83.333333%; }
    .col-md-11 { width: 91.666667%; }
    .col-md-12 { width: 100%; }
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin-bottom: 0;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: 0.375rem;
    transition: all 0.15s ease-in-out;
}

.btn-primary {
    color: #fff;
    background-color: #0d6efd;
    border-color: #0d6efd;
}

.btn-primary:hover {
    color: #fff;
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.btn-outline-light {
    color: #f8f9fa;
    border-color: #f8f9fa;
    background-color: transparent;
}

.btn-outline-light:hover {
    color: #000;
    background-color: #f8f9fa;
    border-color: #f8f9fa;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
    border-radius: 0.5rem;
}

.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
}

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

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

.nav-item {
    margin-right: 1rem;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

.nav-link:hover {
    color: rgba(255, 255, 255, 1);
}

.fixed-top {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1030;
}

.min-vh-100 {
    min-height: 100vh;
}

.align-items-center {
    align-items: center;
}

.text-center {
    text-align: center;
}

.text-md-end {
    text-align: right;
}

.g-4 > * {
    padding: 1.5rem;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.me-1 { margin-right: 0.25rem; }
.me-2 { margin-right: 0.5rem; }
.ms-auto { margin-left: auto; }

.d-flex { display: flex; }
.justify-content-center { justify-content: center; }
.flex-wrap { flex-wrap: wrap; }

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    display: none;
    min-width: 10rem;
    padding: 0.5rem 0;
    margin: 0;
    font-size: 1rem;
    color: #212529;
    text-align: left;
    list-style: none;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 0.375rem;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-menu-end {
    right: 0;
    left: auto;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 0.25rem 1rem;
    clear: both;
    font-weight: 400;
    color: #212529;
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
}

.dropdown-item:hover {
    color: #1e2125;
    background-color: #e9ecef;
}

.navbar-toggler {
    padding: 0.25rem 0.75rem;
    font-size: 1.25rem;
    line-height: 1;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: 0.375rem;
}

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

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

@media (max-width: 991.98px) {
    .navbar-nav {
        flex-direction: column;
    }
    
    .nav-item {
        margin-right: 0;
    }
    
    .col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6,
    .col-lg-7, .col-lg-8, .col-lg-9, .col-lg-10, .col-lg-11, .col-lg-12 {
        width: 100%;
    }
}

@media (max-width: 767.98px) {
    .col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6,
    .col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12 {
        width: 100%;
    }
    
    .text-md-end {
        text-align: center;
    }
} 