/* Bootstrap 5 备用样式 - 简化版本 */
/* 当CDN不可用时使用 */

/* 基础样式 */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    /* 移除默认颜色，让主CSS文件控制颜色 */
    /* color: #212529; */
}

/* 容器 */
.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;
    }
}

/* 网格系统 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -15px;
    margin-left: -15px;
}

.col, .col-1, .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-10, .col-11, .col-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,
.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 {
    position: relative;
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
}

/* 响应式列 */
@media (min-width: 768px) {
    .col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
    .col-md-6 { flex: 0 0 50%; max-width: 50%; }
    .col-md-12 { flex: 0 0 100%; max-width: 100%; }
}

@media (min-width: 992px) {
    .col-lg-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
    .col-lg-6 { flex: 0 0 50%; max-width: 50%; }
    .col-lg-12 { flex: 0 0 100%; max-width: 100%; }
}

/* 工具类 */
.d-flex { display: flex !important; }
.justify-content-center { justify-content: center !important; }
.align-items-center { align-items: center !important; }
.text-center { text-align: center !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mb-5 { margin-bottom: 3rem !important; }
.mb-lg-0 { margin-bottom: 0 !important; }
.mt-5 { margin-top: 3rem !important; }
.me-auto { margin-right: auto !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }
.p-0 { padding: 0 !important; }
.position-relative { position: relative !important; }
.position-absolute { position: absolute !important; }
.fixed-top { position: fixed !important; top: 0; right: 0; left: 0; z-index: 1030; }

/* 导航栏 */
.navbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
}

.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;
}

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

.nav-item {
    display: list-item;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
}

.navbar-toggler {
    padding: 0.25rem 0.75rem;
    font-size: 1.25rem;
    line-height: 1;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: 0.25rem;
    transition: box-shadow 0.15s ease-in-out;
}

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

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

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

/* 按钮 */
.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.btn-close {
    box-sizing: content-box;
    width: 1em;
    height: 1em;
    padding: 0.25em 0.25em;
    /* 移除默认颜色，让主CSS控制 */
    /* color: #000; */
    background: transparent url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23000'%3e%3cpath d='M.293.293a1 1 0 011.414 0L8 6.586 14.293.293a1 1 0 111.414 1.414L9.414 8l6.293 6.293a1 1 0 01-1.414 1.414L8 9.414l-6.293 6.293a1 1 0 01-1.414-1.414L6.586 8 .293 1.707a1 1 0 010-1.414z'/%3e%3c/svg%3e") center/1em auto no-repeat;
    border: 0;
    border-radius: 0.25rem;
    opacity: 0.5;
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1055;
    display: none;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    outline: 0;
}

.modal-dialog {
    position: relative;
    width: auto;
    margin: 0.5rem;
    pointer-events: none;
}

.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    pointer-events: auto;
    /* 移除默认背景色，让主CSS控制 */
    /* background-color: #fff; */
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 0.3rem;
    outline: 0;
}

.modal-header {
    display: flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid #dee2e6;
    border-top-left-radius: calc(0.3rem - 1px);
    border-top-right-radius: calc(0.3rem - 1px);
}

.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: 1rem;
}

.modal-title {
    margin-bottom: 0;
    line-height: 1.5;
}

.modal-fullscreen .modal-dialog {
    width: 100vw;
    max-width: none;
    height: 100%;
    margin: 0;
}

.modal-fullscreen .modal-content {
    height: 100%;
    border: 0;
    border-radius: 0;
}

/* 显示/隐藏 */
.d-none { display: none !important; }
.d-block { display: block !important; }

@media (min-width: 992px) {
    .d-lg-block { display: block !important; }
    .d-lg-none { display: none !important; }
}

/* 工具提示 */
[data-bs-toggle="tooltip"] {
    cursor: help;
}

/* 响应式工具类 */
@media (max-width: 767px) {
    .navbar-expand-lg .navbar-collapse {
        display: none !important;
    }
    
    .navbar-expand-lg .navbar-collapse.show {
        display: flex !important;
    }
}