/* ================================================================
   kjc-base.css — 华中师范大学科技处网站公共样式
   包含: CSS变量 / 重置 / 导航 / 移动端菜单 / 底部 / 响应式
   ================================================================ */

/* CSS 变量 */
:root {
  --primary-50: #f0fafb;
  --primary-100: #d9f2f5;
  --primary-200: #b7e5eb;
  --primary-400: #4db4c4;
  --primary-500: #3299aa;
  --primary-600: #257687;
  --primary-700: #266471;
  --primary-800: #27535e;
  --primary-900: #254650;
  --primary-950: #132d35;
  --accent-400: #e59351;
  --accent-500: #df7a30;
}

/* 重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif; color: #1f2937; background: #fff; -webkit-font-smoothing: antialiased; display: flex; flex-direction: column; min-height: 100vh; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.kjc-container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* 面包屑 */
.kjc-breadcrumb { background: #f9fafb; border-bottom: 1px solid #f3f4f6; }
.kjc-breadcrumb nav { padding: 12px 0; font-size: 13px; color: #6b7280; display: flex; align-items: center; gap: 6px; }
.kjc-breadcrumb a { color: #6b7280; text-decoration: none; transition: color .2s; }
.kjc-breadcrumb a:hover { color: var(--primary-600); }
.kjc-breadcrumb .current { color: var(--primary-600); font-weight: 500; }

/* 主体布局 (内容页) */
.kjc-main { display: flex; gap: 16px; padding: 16px 0; }
.kjc-sidebar { width: 240px; flex-shrink: 0; }
.kjc-content { flex: 1; min-width: 0; }

/* 栏目名称块 */
.kjc-column-title { background: var(--primary-700); border-radius: 8px; overflow: hidden; margin-bottom: 12px; padding: 10px 14px; }
.kjc-column-title h2 { font-size: 16px; font-weight: 700; color: #fff; }
.kjc-column-title .bar { width: 24px; height: 2px; background: var(--primary-400); margin-top: 4px; }

/* 侧边栏子菜单 */
.kjc-submenu-item { display: block; padding: 8px 14px; font-size: 13px; color: #4b5563; border-bottom: 1px solid #f3f4f6; transition: all .15s; }
.kjc-submenu-item:hover { color: var(--primary-600); background: var(--primary-50); }
.kjc-submenu-item.active { color: var(--primary-700); font-weight: 600; background: var(--primary-50); border-left: 3px solid var(--primary-600); }

/* 侧边栏折叠 (宽屏→窄屏) */
@media (max-width: 1080px) {
  .kjc-main { flex-direction: column; gap: 16px; }
  .kjc-sidebar { width: 100%; }
}

/* ====== Header & 导航 ====== */
.kjc-header { background: #fff; border-bottom: 1px solid #e5e7eb; }
.kjc-header .logo-row { padding: 14px 0 8px 0; display: flex; align-items: center; justify-content: space-between; }
.kjc-nav { display: flex; gap: 0; overflow-x: visible; margin-bottom: -1px; }
.kjc-nav-item { position: relative; }
.kjc-nav-item > a { display: block; white-space: nowrap; padding: 10px 16px; font-size: 14px; border-bottom: 2px solid transparent; color: #6b7280; transition: all .2s; text-decoration: none; }
.kjc-nav-item > a:hover { color: var(--primary-600); border-color: var(--primary-200); }
.kjc-nav-item > a.active { color: var(--primary-700); font-weight: 600; border-color: var(--primary-600); }
.kjc-nav-dropdown { display: none; position: absolute; top: 100%; left: 0; min-width: 140px; background: #fff; border: 1px solid #e5e7eb; border-radius: 6px; box-shadow: 0 4px 16px rgba(0,0,0,.08); z-index: 100; padding: 4px 0; }
.kjc-nav-dropdown a { display: block; padding: 8px 16px; font-size: 13px; color: #4b5563; white-space: nowrap; text-decoration: none; transition: all .15s; }
.kjc-nav-dropdown a:hover { color: var(--primary-600); background: #f0fafb; }
.kjc-nav-item.has-sub:hover .kjc-nav-dropdown { display: block; }
.kjc-header-right { display: flex; align-items: center; gap: 10px; }
.kjc-header-search { position: relative; display: flex; align-items: center; }
.kjc-header-search input { width: 160px; padding: 6px 12px 6px 30px; font-size: 12px; border: 1px solid #e5e7eb; border-radius: 6px; background: #f9fafb; outline: none; color: #374151; transition: all .2s; }
.kjc-header-search input:focus { border-color: var(--primary-400); background: #fff; }
.kjc-lang-btns { display: flex; align-items: center; gap: 2px; font-size: 12px; white-space: nowrap; }
.kjc-lang-btns .lang-active { color: var(--primary-700); font-weight: 600; padding: 2px 4px; }
.kjc-lang-btns .lang-sep { color: #d1d5db; padding: 0 1px; }
.kjc-lang-btns a { color: #9ca3af; text-decoration: none; padding: 2px 4px; border-radius: 3px; transition: color .15s; }
.kjc-lang-btns a:hover { color: var(--primary-600); }
.kjc-mobile-btn { display: none; padding: 6px; color: #6b7280; background: none; border: none; cursor: pointer; line-height: 0; border-radius: 4px; transition: color .15s; }
.kjc-mobile-btn:hover { color: var(--primary-600); }
.kjc-mobile-menu { display: none; border-top: 1px solid #e5e7eb; background: #fff; }
.kjc-mobile-menu .inner { max-width: 1200px; margin: 0 auto; padding: 12px 24px; }
.kjc-mobile-menu .search-wrap { position: relative; margin-bottom: 12px; }
.kjc-mobile-menu .search-wrap input { width: 100%; padding: 8px 12px 8px 34px; font-size: 13px; border: 1px solid #e5e7eb; border-radius: 6px; background: #f9fafb; outline: none; }
.kjc-mobile-menu .search-wrap .s-icon { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); pointer-events: none; color: #9ca3af; }
.kjc-mobile-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.kjc-mobile-nav a { padding: 8px 12px; font-size: 13px; color: #6b7280; border-radius: 4px; transition: background .15s; display: block; text-decoration: none; }
.kjc-mobile-nav a:hover, .kjc-mobile-nav a.active { color: var(--primary-700); background: #f0fafb; font-weight: 600; }

/* ====== Footer ====== */
.kjc-footer { background: var(--primary-900); margin-top: auto; }
.kjc-footer .footer-grid { padding: 20px 0; display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.kjc-footer h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 12px; }
.kjc-footer a { font-size: 12px; color: var(--primary-400); transition: color .15s; text-decoration: none; }
.kjc-footer a:hover { color: #fff; }
.kjc-footer .footer-nav-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.kjc-footer .footer-nav-grid a { font-size: 12px; color: var(--primary-400); display: block; transition: color .15s; }
.kjc-footer .footer-nav-grid a:hover { color: #fff; }
.kjc-footer .footer-links-list { display: flex; flex-direction: column; gap: 6px; }
.kjc-footer .footer-links-list a { display: flex; align-items: center; gap: 4px; font-size: 12px; color: var(--primary-400); transition: color .15s; }
.kjc-footer .footer-links-list a:hover { color: #fff; }
.kjc-footer .copyright { text-align: center; font-size: 10px; color: var(--primary-700); padding: 10px 0; border-top: 1px solid var(--primary-800); }

/* ====== 移动端响应式 ====== */
@media (max-width: 768px) {
  .kjc-mobile-btn { display: flex; }
  .kjc-nav { display: none; }
  .kjc-header-search { display: none; }
  .kjc-header .logo-row { padding: 14px 0; }
  .kjc-footer .footer-grid { grid-template-columns: 1fr; }
}