/*!
 * fanblog.css — 手写替代 Bootstrap 4.4.1（仅含 FanBlog 主题实际用到的部分）
 * 覆盖：Reboot 基础、5 档栅格、flex/间距/文字工具类、
 *      card / btn / badge / list-inline / form / navbar+dropdown / img / pagination
 * 断点：sm≥576 md≥768 lg≥992 xl≥1200（与 BS4 一致）
 * 说明：数值直接对齐 BS4，用于无缝替换，不改变现有视觉。
 */

/* ============================================================
 * 1. Reboot（最小化，仅补 BS 会重置、而浏览器默认不一致的部分）
 * ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  background-color: #fff;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-weight: 500;
  line-height: 1.2;
}
h1 { font-size: 2.5rem; }
h5 { font-size: 1.25rem; }

p { margin-top: 0; margin-bottom: 1rem; }

a {
  color: #007bff;
  text-decoration: none;
  background-color: transparent;
}
a:hover { color: #0056b3; text-decoration: underline; }

img { vertical-align: middle; border-style: none; }

ul { margin-top: 0; margin-bottom: 1rem; }

button,
input {
  margin: 0;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}
button { overflow: visible; text-transform: none; }
button:not(:disabled) { cursor: pointer; }

.display-4 { font-size: 3.5rem; font-weight: 300; line-height: 1.2; }

/* ============================================================
 * 2. 容器 Container
 * ============================================================ */
.container,
.container-fluid {
  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; } }

/* ============================================================
 * 3. 栅格 Grid（完整 5 档 + 12 列）
 * ============================================================ */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -15px;
  margin-left: -15px;
}
.no-gutters { margin-right: 0; margin-left: 0; }
.no-gutters > [class*="col-"] { padding-right: 0; padding-left: 0; }

/* 所有 col 通用内边距 */
.col, [class*="col-"] {
  position: relative;
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
}

/* --- 无前缀（xs，恒定生效） --- */
.col { flex-basis: 0; flex-grow: 1; max-width: 100%; }
.col-1  { flex: 0 0 8.333333%;  max-width: 8.333333%; }
.col-2  { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3  { flex: 0 0 25%;        max-width: 25%; }
.col-4  { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-5  { flex: 0 0 41.666667%; max-width: 41.666667%; }
.col-6  { flex: 0 0 50%;        max-width: 50%; }
.col-7  { flex: 0 0 58.333333%; max-width: 58.333333%; }
.col-8  { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9  { flex: 0 0 75%;        max-width: 75%; }
.col-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
.col-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
.col-12 { flex: 0 0 100%;       max-width: 100%; }

/* --- sm ≥576 --- */
@media (min-width: 576px) {
  .col-sm    { flex-basis: 0; flex-grow: 1; max-width: 100%; }
  .col-sm-1  { flex: 0 0 8.333333%;  max-width: 8.333333%; }
  .col-sm-2  { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-sm-3  { flex: 0 0 25%;        max-width: 25%; }
  .col-sm-4  { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-sm-5  { flex: 0 0 41.666667%; max-width: 41.666667%; }
  .col-sm-6  { flex: 0 0 50%;        max-width: 50%; }
  .col-sm-7  { flex: 0 0 58.333333%; max-width: 58.333333%; }
  .col-sm-8  { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-sm-9  { flex: 0 0 75%;        max-width: 75%; }
  .col-sm-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
  .col-sm-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
  .col-sm-12 { flex: 0 0 100%;       max-width: 100%; }
  .offset-sm-0  { margin-left: 0; }
  .offset-sm-1  { margin-left: 8.333333%; }
  .offset-sm-2  { margin-left: 16.666667%; }
  .offset-sm-3  { margin-left: 25%; }
  .offset-sm-4  { margin-left: 33.333333%; }
  .offset-sm-5  { margin-left: 41.666667%; }
  .offset-sm-6  { margin-left: 50%; }
}

/* --- md ≥768 --- */
@media (min-width: 768px) {
  .col-md    { flex-basis: 0; flex-grow: 1; max-width: 100%; }
  .col-md-1  { flex: 0 0 8.333333%;  max-width: 8.333333%; }
  .col-md-2  { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-md-3  { flex: 0 0 25%;        max-width: 25%; }
  .col-md-4  { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-md-5  { flex: 0 0 41.666667%; max-width: 41.666667%; }
  .col-md-6  { flex: 0 0 50%;        max-width: 50%; }
  .col-md-7  { flex: 0 0 58.333333%; max-width: 58.333333%; }
  .col-md-8  { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-md-9  { flex: 0 0 75%;        max-width: 75%; }
  .col-md-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
  .col-md-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
  .col-md-12 { flex: 0 0 100%;       max-width: 100%; }
  .offset-md-0  { margin-left: 0; }
  .offset-md-1  { margin-left: 8.333333%; }
  .offset-md-2  { margin-left: 16.666667%; }
  .offset-md-3  { margin-left: 25%; }
  .offset-md-4  { margin-left: 33.333333%; }
  .offset-md-5  { margin-left: 41.666667%; }
  .offset-md-6  { margin-left: 50%; }
}

/* --- lg ≥992 --- */
@media (min-width: 992px) {
  .col-lg    { flex-basis: 0; flex-grow: 1; max-width: 100%; }
  .col-lg-1  { flex: 0 0 8.333333%;  max-width: 8.333333%; }
  .col-lg-2  { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-lg-3  { flex: 0 0 25%;        max-width: 25%; }
  .col-lg-4  { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-lg-5  { flex: 0 0 41.666667%; max-width: 41.666667%; }
  .col-lg-6  { flex: 0 0 50%;        max-width: 50%; }
  .col-lg-7  { flex: 0 0 58.333333%; max-width: 58.333333%; }
  .col-lg-8  { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-lg-9  { flex: 0 0 75%;        max-width: 75%; }
  .col-lg-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
  .col-lg-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
  .col-lg-12 { flex: 0 0 100%;       max-width: 100%; }
  .offset-lg-0  { margin-left: 0; }
  .offset-lg-1  { margin-left: 8.333333%; }
  .offset-lg-2  { margin-left: 16.666667%; }
  .offset-lg-3  { margin-left: 25%; }
  .offset-lg-4  { margin-left: 33.333333%; }
  .offset-lg-5  { margin-left: 41.666667%; }
  .offset-lg-6  { margin-left: 50%; }
}

/* --- xl ≥1200 --- */
@media (min-width: 1200px) {
  .col-xl    { flex-basis: 0; flex-grow: 1; max-width: 100%; }
  .col-xl-1  { flex: 0 0 8.333333%;  max-width: 8.333333%; }
  .col-xl-2  { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-xl-3  { flex: 0 0 25%;        max-width: 25%; }
  .col-xl-4  { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-xl-5  { flex: 0 0 41.666667%; max-width: 41.666667%; }
  .col-xl-6  { flex: 0 0 50%;        max-width: 50%; }
  .col-xl-7  { flex: 0 0 58.333333%; max-width: 58.333333%; }
  .col-xl-8  { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-xl-9  { flex: 0 0 75%;        max-width: 75%; }
  .col-xl-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
  .col-xl-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
  .col-xl-12 { flex: 0 0 100%;       max-width: 100%; }
  .offset-xl-0  { margin-left: 0; }
  .offset-xl-1  { margin-left: 8.333333%; }
  .offset-xl-2  { margin-left: 16.666667%; }
  .offset-xl-3  { margin-left: 25%; }
  .offset-xl-4  { margin-left: 33.333333%; }
  .offset-xl-5  { margin-left: 41.666667%; }
  .offset-xl-6  { margin-left: 50%; }
}

/* ============================================================
 * 4. Flex 工具类
 * ============================================================ */
.d-flex        { display: flex !important; }
.d-block       { display: block !important; }
.d-none        { display: none !important; }
.flex-column   { flex-direction: column !important; }
.flex-row      { flex-direction: row !important; }
.justify-content-start   { justify-content: flex-start !important; }
.justify-content-end     { justify-content: flex-end !important; }
.justify-content-center  { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.justify-content-around  { justify-content: space-around !important; }
.align-items-center      { align-items: center !important; }

/* ============================================================
 * 5. 间距工具类（margin / padding，0-5 档，含方向）
 *    0=0  1=.25rem  2=.5rem  3=1rem  4=1.5rem  5=3rem
 * ============================================================ */
.m-0{margin:0!important}.m-1{margin:.25rem!important}.m-2{margin:.5rem!important}.m-3{margin:1rem!important}.m-4{margin:1.5rem!important}.m-5{margin:3rem!important}.m-auto{margin:auto!important}

.mt-0{margin-top:0!important}.mt-1{margin-top:.25rem!important}.mt-2{margin-top:.5rem!important}.mt-3{margin-top:1rem!important}.mt-4{margin-top:1.5rem!important}.mt-5{margin-top:3rem!important}
.mb-0{margin-bottom:0!important}.mb-1{margin-bottom:.25rem!important}.mb-2{margin-bottom:.5rem!important}.mb-3{margin-bottom:1rem!important}.mb-4{margin-bottom:1.5rem!important}.mb-5{margin-bottom:3rem!important}
.ml-0{margin-left:0!important}.ml-1{margin-left:.25rem!important}.ml-2{margin-left:.5rem!important}.ml-3{margin-left:1rem!important}.ml-4{margin-left:1.5rem!important}.ml-5{margin-left:3rem!important}.ml-auto{margin-left:auto!important}
.mr-0{margin-right:0!important}.mr-1{margin-right:.25rem!important}.mr-2{margin-right:.5rem!important}.mr-3{margin-right:1rem!important}.mr-4{margin-right:1.5rem!important}.mr-5{margin-right:3rem!important}.mr-auto{margin-right:auto!important}
.mx-auto{margin-right:auto!important;margin-left:auto!important}

.p-0{padding:0!important}.p-1{padding:.25rem!important}.p-2{padding:.5rem!important}.p-3{padding:1rem!important}.p-4{padding:1.5rem!important}.p-5{padding:3rem!important}
.pt-0{padding-top:0!important}.pt-1{padding-top:.25rem!important}.pt-2{padding-top:.5rem!important}.pt-3{padding-top:1rem!important}.pt-4{padding-top:1.5rem!important}.pt-5{padding-top:3rem!important}
.pb-0{padding-bottom:0!important}.pb-1{padding-bottom:.25rem!important}.pb-2{padding-bottom:.5rem!important}.pb-3{padding-bottom:1rem!important}.pb-4{padding-bottom:1.5rem!important}.pb-5{padding-bottom:3rem!important}
.pl-0{padding-left:0!important}.pl-1{padding-left:.25rem!important}.pl-2{padding-left:.5rem!important}.pl-3{padding-left:1rem!important}.pl-4{padding-left:1.5rem!important}.pl-5{padding-left:3rem!important}
.pr-0{padding-right:0!important}.pr-1{padding-right:.25rem!important}.pr-2{padding-right:.5rem!important}.pr-3{padding-right:1rem!important}.pr-4{padding-right:1.5rem!important}.pr-5{padding-right:3rem!important}

/* mt-8：模板里 index.php / search.php / category.php 用到，BS4 无此档，
   这里补一个较大上边距，取 5rem，与原先 Bootstrap 下“无定义→无效果”相比更合理。
   若想完全复现原样（原本无效果），把下面一行删掉即可。 */
.mt-8 { margin-top: 5rem !important; }

/* ============================================================
 * 6. 文字工具类
 * ============================================================ */
.text-center { text-align: center !important; }
.text-right  { text-align: right !important; }
.text-left   { text-align: left !important; }
.text-muted  { color: #6c757d !important; }
.text-dark   { color: #343a40 !important; }
.text-white  { color: #fff !important; }
.small       { font-size: 80%; font-weight: 400; }
.font-weight-bold   { font-weight: 700 !important; }
.font-weight-normal { font-weight: 400 !important; }

/* ============================================================
 * 7. 图片
 * ============================================================ */
.img-fluid { max-width: 100%; height: auto; }
.rounded        { border-radius: 0.25rem !important; }
.rounded-left   { border-top-left-radius: 0.25rem !important; border-bottom-left-radius: 0.25rem !important; }
.rounded-right  { border-top-right-radius: 0.25rem !important; border-bottom-right-radius: 0.25rem !important; }

/* ============================================================
 * 8. 卡片 Card
 * ============================================================ */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  word-wrap: break-word;
  background-color: #fff;
  background-clip: border-box;
  border: 1px solid rgba(0, 0, 0, 0.125);
  border-radius: 0.25rem;
}
.card-title { margin-bottom: 0.75rem; }
.h-100 { height: 100% !important; }
.shadow-sm { box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075) !important; }

/* ============================================================
 * 9. 按钮 Button
 * ============================================================ */
.btn {
  display: inline-block;
  font-weight: 400;
  color: #212529;
  text-align: center;
  vertical-align: middle;
  user-select: none;
  background-color: transparent;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  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;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.875rem; line-height: 1.5; border-radius: 0.2rem; }

.btn-outline-secondary { color: #6c757d; border-color: #6c757d; }
.btn-outline-secondary:hover { color: #fff; background-color: #6c757d; border-color: #6c757d; }

.btn-outline-success { color: #28a745; border-color: #28a745; }
.btn-outline-success:hover { color: #fff; background-color: #28a745; border-color: #28a745; }

/* ============================================================
 * 10. 徽章 Badge & 内联列表
 * ============================================================ */
.badge {
  display: inline-block;
  padding: 0.25em 0.4em;
  font-size: 75%;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: 0.25rem;
}
.badge-secondary { color: #fff; background-color: #6c757d; }

.list-inline { padding-left: 0; list-style: none; margin-bottom: 1rem; }
.list-inline-item { display: inline-block; }
.list-inline-item:not(:last-child) { margin-right: 0.5rem; }

/* page-links（wp_link_pages 分页） */
.page-links { margin: 1rem 0; }

/* ============================================================
 * 11. 表单（搜索框用到）
 * ============================================================ */
.form-inline { display: flex; flex-flow: row wrap; align-items: center; }
.form-control {
  display: block;
  width: 100%;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  color: #495057;
  background-color: #fff;
  border: 1px solid #ced4da;
  border-radius: 0.25rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.form-control:focus {
  color: #495057;
  background-color: #fff;
  border-color: #80bdff;
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}
.form-inline .form-control { display: inline-block; width: auto; vertical-align: middle; }

@media (min-width: 576px) {
  .form-inline .mr-sm-2 { margin-right: 0.5rem !important; }
}
.my-2 { margin-top: 0.5rem !important; margin-bottom: 0.5rem !important; }
@media (min-width: 992px) {
  .my-lg-0 { margin-top: 0 !important; margin-bottom: 0 !important; }
}
@media (min-width: 576px) {
  .my-sm-0 { margin-top: 0 !important; margin-bottom: 0 !important; }
}

/* ============================================================
 * 12. 导航栏 Navbar + 下拉 Dropdown
 *    结构对齐 WP_Bootstrap_Navwalker 输出：
 *    .navbar > .navbar-brand / .navbar-toggler / .collapse.navbar-collapse
 *      > ul.navbar-nav > li.nav-item(.dropdown) > a.nav-link(.dropdown-toggle)
 *          > ul.dropdown-menu > li > a.dropdown-item
 * ============================================================ */
.navbar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
}
.navbar-light { color: #212529; }
.bg-white { background-color: #fff !important; }

.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-brand img { display: block; }

/* 汉堡按钮 */
.navbar-toggler {
  padding: 0.25rem 0.75rem;
  font-size: 1.25rem;
  line-height: 1;
  background-color: transparent;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 0.25rem;
}
.navbar-toggler:focus { outline: 0; box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25); }
.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-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-nav {
  display: flex;
  flex-direction: column;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}
.navbar-nav .nav-link {
  display: block;
  padding: 0.5rem 0;
  color: rgba(0, 0, 0, 0.5);
  text-decoration: none;
}
.navbar-nav .nav-link:hover { color: rgba(0, 0, 0, 0.7); }
.navbar-nav .active > .nav-link,
.navbar-nav .nav-link.active { color: rgba(0, 0, 0, 0.9); }

/* 折叠容器：移动端默认收起 */
.navbar-collapse { flex-basis: 100%; flex-grow: 1; align-items: center; }
.collapse:not(.show) { display: none; }
.collapse.show { display: block; }

/* 下拉菜单容器 */
.dropdown { position: relative; }
.dropdown-toggle::after {
  display: inline-block;
  margin-left: 0.255em;
  vertical-align: 0.255em;
  content: "";
  border-top: 0.3em solid;
  border-right: 0.3em solid transparent;
  border-bottom: 0;
  border-left: 0.3em solid transparent;
}
.dropdown-menu {
  display: none;              /* 默认隐藏，JS 加 .show 显示 */
  padding: 0.5rem 0;
  margin: 0;
  font-size: 1rem;
  color: #212529;
  list-style: none;
  background-color: #fff;
  background-clip: padding-box;
}
.dropdown-menu.show { display: block; }
.dropdown-item {
  display: block;
  width: 100%;
  padding: 0.25rem 1.5rem;
  clear: both;
  font-weight: 400;
  color: #212529;
  text-align: inherit;
  white-space: nowrap;
  background-color: transparent;
  border: 0;
  text-decoration: none;
}
.dropdown-item:hover, .dropdown-item:focus {
  color: #16181b;
  background-color: #f8f9fa;
}

/* --- 移动端（<992，navbar-expand-lg 收起态）--- */
/* 下拉在移动端为内联展开（无浮层、无边框），子项缩进 */
.dropdown-menu {
  border: 0;
  border-radius: 0;
  box-shadow: none;
}
.navbar-nav .dropdown-menu .dropdown-item { padding-left: 1.5rem; }

/* --- 桌面端 ≥992（navbar-expand-lg 展开态）--- */
@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-toggler { display: none; }
  /* 折叠容器在桌面端强制展开为横向 */
  .navbar-expand-lg .navbar-collapse {
    display: flex !important;
    flex-basis: auto;
  }
  /* 桌面端下拉恢复为浮层 */
  .navbar-expand-lg .navbar-nav .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    float: left;
    min-width: 10rem;
    margin-top: 0.125rem;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 0.25rem;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.175);
  }
}

.mr-auto { margin-right: auto !important; }

/* ============================================================
 * 13. 分页 Pagination（沿用你 style.css 原样，放这里统一管理）
 * ============================================================ */
.pagination {
  display: flex;
  flex-wrap: wrap;
  padding-left: 0;
  list-style: none;
  justify-content: center;
}
.pagination .page-item { margin: 2px; }
.pagination .page-link {
  display: block;
  border-radius: 5px;
  padding: 8px 12px;
  color: #007bff;
  border: 1px solid #ddd;
  background: #f8f9fa;
  text-decoration: none;
}
.pagination .page-link:hover { background: #e9ecef; }
.pagination .page-item.active .page-link {
  background: #007bff;
  color: #fff;
  font-weight: bold;
  border-color: #007bff;
}

/* ============================================================
 * 14. 页脚 Footer（模板用了 .footer，BS 无此类，给最小样式）
 * ============================================================ */
.footer { padding: 2rem 0; margin-top: 3rem; background-color: #f8f9fa; }