/* ============================================================
   SHARED CSS — 全局共享样式
   所有页面布局共用 (Header/Nav/Footer/公共组件)
   依赖此文件的业务 CSS: homepage.css / personalcenter.css
   ============================================================ */

/* ============================================================
   CSS Variables / Reset / Base — 全局基础
   ============================================================ */

/* CSS Variables */
:root {
  /* 主色 — #3884dc */
  --blue-50:  #EBF3FC;
  --blue-100: #D7E7FA;
  --blue-200: #AFCFF5;
  --blue-300: #7DB4EF;
  --blue-400: #5C9DE6;
  --blue-500: #3884DC;
  --blue-600: #2E72C2;
  --blue-700: #2560A8;
  --blue-800: #1C4E8E;
  --blue-900: #133C74;

  --primary:            var(--blue-500);
  --primary-hover:      var(--blue-600);
  --primary-light:      var(--blue-50);
  --primary-border:     var(--blue-200);

  /* 辅助色 */
  --red:                #C8102E;
  --red-hover:          #A00D24;
  --gold:               #C49A2C;
  --success:            #2E7D32;
  --success-light:      #E8F5E9;
  --warning:            #E67E22;
  --warning-light:      #FFF3E0;
  --danger:             #C62828;
  --danger-light:       #FFEBEE;

  /* 中性色 */
  --gray-50:            #F5F6F8;
  --gray-100:           #EBECEF;
  --gray-200:           #D6D8DD;
  --gray-300:           #BFC2C9;
  --gray-400:           #9DA1AB;
  --gray-500:           #7B7F8B;
  --gray-600:           #5F636F;
  --gray-700:           #434752;
  --gray-800:           #2B2E37;
  --gray-900:           #111318;

  --bg:                 #EEF0F4;
  --surface:            #FFFFFF;
  --surface-gradient:   linear-gradient(180deg, #FFFFFF 0%, #FAFBFC 100%);
  --border:             var(--gray-200);
  --border-light:       var(--gray-100);
  --text:               #1A1E24;
  --text-secondary:     #4A4F5A;
  --text-muted:         #6B6F7A;

  /* 导航 & 页脚 */
  --nav-bg:             var(--blue-600);
  --nav-hover:          var(--blue-700);
  --topbar-bg:          var(--gray-800);
  --footer-bg:          var(--gray-800);
  --footer-text:        #B0B4BE;

  /* 圆角 */
  --radius: 4px;
  --radius-sm: 3px;
  --radius-lg: 6px;

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.05), 0 0 0 1px rgba(0,0,0,.02);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.07), 0 2px 6px rgba(0,0,0,.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,.09), 0 4px 12px rgba(0,0,0,.04);
  --shadow-lg: 0 4px 16px rgba(0,0,0,.11), 0 8px 24px rgba(0,0,0,.05);

  /* 间距 */
  --spacing-xs:  4px;
  --spacing-sm:  8px;
  --spacing-md:  16px;
  --spacing-lg:  24px;
  --spacing-xl:  32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 60px;

  /* 字号 */
  --text-xs:   13px;
  --text-sm:   14px;
  --text-base: 16px;
  --text-md:   18px;
  --text-lg:   20px;
  --text-xl:   22px;
  --text-2xl:  26px;
  --text-3xl:  32px;
  --text-4xl:  44px;

  --transition: 180ms ease;
  --transition-slow: 300ms ease;
}

/* Keyframes */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes fadeInStagger {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-hover); }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }
/* 消除 Bootstrap/common.css 对 header 区域的干扰 */
.header .search-box,
.header .search-box input,
.header .search-box button { box-sizing: border-box; }
.header .search-box { margin-bottom: 0; }

.container {
  width: auto;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}
/* 取消 Bootstrap .container clearfix（homepage 用 flex/grid 布局，不需要浮动清除） */
.container:before,
.container:after { display: none; }

/* ============================================================
   HEADER
   ============================================================ */
.header {
  background: var(--surface);
  padding: 15px 0;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: relative; z-index: 10;
}
.header .container { display: flex; align-items: center; gap: var(--spacing-xl); }
.header .logo-area { height: 80px; display: flex; align-items: center; gap: var(--spacing-md); flex-shrink: 0; transition: opacity var(--transition); }
.header .logo-area:hover { opacity: .85; }
.header .logo-area img { height: 56px; }
.header .logo-icon {
  width: 54px; height: 54px; border-radius: var(--radius);
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 28px; font-weight: 700;
  font-family: "SimSun", "STSong", serif;
}
.header .logo-text .logo-title {
  font-size: var(--text-xl); font-weight: 700; color: var(--gray-900);
  letter-spacing: 1px;
}
.header .logo-text .logo-sub {
  font-size: var(--text-xs); color: var(--text-secondary); margin-top: 1px;
}

/* 搜索 */
.header .search-box {
  flex: 1; max-width: 520px; display: flex;
  border: 1px solid #D6D8DD; border-radius: 4px;
  overflow: hidden; margin: 0;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}
.header .search-box:focus-within {
  border-color: #3884DC;
  box-shadow: 0 0 0 2px rgba(56,132,220,.12);
}
.header .search-box input[type="text"] {
  flex: 1; height: 48px; padding: 0 16px;
  border: 0 none; font-size: 14px; outline: none;
  background: #F5F6F8; box-shadow: none;
  margin: 0; width: auto; float: none;
  line-height: 48px;
}
.header .search-box input[type="text"]:focus { background: #fff; }
.header .search-box input[type="text"]::-webkit-input-placeholder { color: #9DA1AB; }
.header .search-box input[type="text"]::placeholder { color: #9DA1AB; }
.header .search-box button[type="submit"] {
  display: inline-flex; align-items: center; justify-content: center;
  height: 48px; min-width: 80px; padding: 0 28px;
  background: #3884DC; color: #fff;
  border: 0 none; font-size: 16px; font-weight: 500;
  letter-spacing: 0; line-height: 48px;
  cursor: pointer; white-space: nowrap; flex-shrink: 0;
  margin: 0;
  transition: background 180ms ease, letter-spacing 180ms ease;
  -webkit-appearance: none; -moz-appearance: none;
}
.header .search-box button[type="submit"]:hover {
  background: #2E72C2; letter-spacing: 2px;
}

.header .header-actions { display: flex; align-items: center; gap: var(--spacing-md); min-width: 0; margin-left: var(--spacing-md); }
.header .header-actions .hdr-link {
  display: inline-flex; align-items: center; gap: 4px; font-size: 14px;
  color: #4A4F5A; padding: 8px 14px; line-height: 1.5;
  transition: all 180ms ease;
}
.header .header-actions .hdr-link:hover { color: #3884DC; background: #EBF3FC; }
.header .header-actions .hdr-link + .hdr-link { border-left: 1px solid #D6D8DD; }
.header .header-actions .cart-icon {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 8px 18px; border-radius: 22px;
  background: transparent; color: var(--primary);
  font-size: var(--text-base); font-weight: 600; line-height: 1.5;
  transition: all 180ms ease;
}
.header .header-actions .cart-icon:hover {
  background: var(--primary-light); color: var(--primary-hover);
}
.header .header-actions .cart-icon .cart-svg {
  width: 28px; height: 28px; flex-shrink: 0;
  stroke: currentColor; stroke-width: 1.8;
  fill: none;
}
.header .header-actions .cart-icon .cart-text { white-space: nowrap; }
.header .header-actions .cart-icon .count {
  position: absolute; top: -4px; right: -6px;
  background: #C8102E; color: #fff; font-size: 11px;
  min-width: 16px; height: 16px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; padding: 0 2px;
  line-height: 1;
}
.header .user-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px;
  background: #fff; color: #3884DC;
  border: 1px solid #3884DC; border-radius: 20px;
  font-size: 14px; font-weight: 500;
  cursor: pointer; text-decoration: none;
  max-width: 160px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  transition: all 180ms ease;
  -webkit-appearance: none; -moz-appearance: none;
}
.header .user-btn .user-svg {
  width: 16px; height: 16px; flex-shrink: 0;
  stroke: #3884DC; stroke-width: 1.8; fill: none;
}
.header .user-btn:hover {
  background: #3884DC; color: #fff; transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(56,132,220,.25);
}
.header .user-btn:hover .user-svg { stroke: #fff; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  background: var(--nav-bg);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid var(--blue-700);
}
.nav .container { display: flex; align-items: stretch; }
.nav .nav-catalog {
  display: flex; align-items: center; gap: var(--spacing-sm);
  background: var(--primary);
  color: #fff; padding: 14px 30px;
  font-size: 18px; font-weight: 600;
  cursor: pointer; white-space: nowrap;
  transition: background var(--transition);
}
.nav .nav-catalog:hover { background: var(--primary-hover); }
.nav .nav-links { display: flex; }
.nav .nav-links a {
  display: flex; align-items: center;
  color: #fff;
  padding: 14px 30px; font-size: 18px; font-weight: 400;
  transition: background var(--transition);
  margin-right: 1px;
}
.nav .nav-links a:hover { background: var(--blue-800); }
.nav .nav-links a.active { background: var(--blue-800); font-weight: 600; }

/* 导航下拉：父级为纯触发器，悬停展开子栏目 */
.nav .nav-links .nav-item.has-sub {
  position: relative; display: flex; align-items: center;
  margin-right: 1px;
}
.nav .nav-links .nav-item.has-sub .nav-trigger {
  display: flex; align-items: center; gap: 6px;
  color: #fff; padding: 14px 30px; font-size: 18px; font-weight: 400;
  cursor: pointer; white-space: nowrap;
  transition: background var(--transition);
}
.nav .nav-links .nav-item.has-sub:hover .nav-trigger,
.nav .nav-links .nav-item.has-sub.active .nav-trigger { background: var(--blue-800); }
.nav .nav-links .nav-item.has-sub.active .nav-trigger { font-weight: 600; }
.nav .nav-links .nav-arrow {
  width: 0; height: 0;
  border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 6px solid #fff;
  transition: transform var(--transition);
}
.nav .nav-links .nav-item.has-sub:hover .nav-arrow { transform: rotate(180deg); }
.nav .nav-links .nav-sub {
  position: absolute; top: 100%; left: 0; z-index: 100;
  min-width: 100%;
  background: #fff; border-radius: 0 0 4px 4px;
  box-shadow: var(--shadow-lg);
  padding: 6px 0;
  opacity: 0; visibility: hidden; transform: translateY(6px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}
.nav .nav-links .nav-item.has-sub:hover .nav-sub {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav .nav-links .nav-sub a {
  display: block; color: var(--text-secondary);
  padding: 10px 24px; font-size: 15px; font-weight: 400;
  margin-right: 0; white-space: nowrap;
  border-left: 3px solid transparent;
  transition: all var(--transition);
}
.nav .nav-links .nav-sub a:hover {
  background: var(--blue-50); color: var(--blue-800);
  border-left-color: var(--blue-800);
}
.nav .nav-phone {
  margin-left: auto; display: flex; align-items: center; gap: 6px;
  color: #fff; font-size: 18px; font-weight: 700;
  padding: 0 var(--spacing-md);
}

/* ============================================================
   SECTION COMMON
   ============================================================ */
.section { padding: var(--spacing-lg) 0; }

/* 重点栏目 */
.section-featured {
  padding: var(--spacing-md) 0 var(--spacing-lg);
  position: relative;
}
.section-featured::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--blue-200), transparent);
  border-radius: 0 0 1px 1px;
}
.section-featured .featured-card {
  background: var(--surface-gradient);
  border: 1px solid var(--border);
  border-top: 1px solid rgba(255,255,255,.9);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border);
}
.section-header .sh-title {
  font-size: var(--text-xl); font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: var(--spacing-sm);
}
.section-header .sh-title::before {
  content: ''; width: 4px; height: 20px; background: var(--primary); border-radius: 2px;
}
.section-header .sh-subtitle { font-size: var(--text-sm); color: var(--text-secondary); margin-left: var(--spacing-md); }
.section-header .sh-more {
  font-size: var(--text-sm); color: var(--text-secondary);
  transition: all var(--transition); padding: 4px 0;
}
.section-header .sh-more:hover { color: var(--primary); padding-right: 4px; }

/* 分类筛选 */
.filter-bar { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-lg); }
.filter-bar .filter-label { font-size: var(--text-sm); font-weight: 600; color: var(--text); white-space: nowrap; }
.filter-bar .filter-options { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }
.filter-opt {
  padding: 4px 14px; font-size: var(--text-sm); cursor: pointer; border-radius: var(--radius-sm);
  color: var(--text-secondary); transition: all var(--transition);
}
.filter-opt:hover { color: var(--primary); background: var(--primary-light); }
.filter-opt.active { color: #fff; background: linear-gradient(180deg, var(--blue-400) 0%, var(--primary) 100%); box-shadow: 0 1px 3px rgba(0,0,0,.1); }

/* ============================================================
   FLOATING SIDEBAR — 右侧浮动窗
   ============================================================ */
.floating-bar {
  position: fixed; right: 16px; top: 50%; transform: translateY(-50%);
  z-index: 999; display: flex; flex-direction: column; gap: 4px;
}
.floating-bar a {
  position: relative;
  width: 58px; height: 58px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer; text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.floating-bar a:hover {
  background: linear-gradient(180deg, var(--blue-400) 0%, var(--primary) 100%);
  transform: translateX(-3px);
  box-shadow: var(--shadow-md);
}
.floating-bar a .fb-icon {
  font-size: 22px; color: var(--text-secondary); line-height: 1;
  margin-bottom: 3px;
  transition: color var(--transition);
}
.floating-bar a:hover .fb-icon { color: #fff; }
.floating-bar a .fb-text {
  font-size: 12px; color: var(--text-secondary);
  line-height: 1; font-weight: 500;
  transition: color var(--transition);
}
.floating-bar a:hover .fb-text { color: rgba(255,255,255,.9); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--footer-bg); color: var(--footer-text);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-xl); font-size: var(--text-sm);
  border-top: 4px solid var(--gray-600);
}
.footer .footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}
.footer .footer-col h4 {
  color: #fff; font-size: var(--text-md); font-weight: 600;
  margin-bottom: var(--spacing-md); padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer .footer-col p { line-height: 1.8; }
.footer .footer-col .link-list a {
  color: var(--footer-text); line-height: 2; display: block;
  padding: 2px 0 2px 12px; position: relative;
  transition: all var(--transition);
}
.footer .footer-col .link-list a::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--primary); transition: left var(--transition);
}
.footer .footer-col .link-list a:hover { color: #fff; padding-left: 16px; }
.footer .footer-col .contact-item {
  display: flex; align-items: flex-start; gap: var(--spacing-sm); margin-bottom: var(--spacing-sm);
  line-height: 1.8;
}
.footer .footer-col .contact-item span {
  flex-shrink: 0; color: rgba(255,255,255,.5); font-size: var(--text-xs);
  min-width: 32px;
}
.footer .footer-qr { text-align: center; }
.footer .footer-qr .qr-box {
  width: 88px; height: 88px; background: #fff; border-radius: var(--radius);
  margin: 0 auto var(--spacing-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; color: var(--text-muted);
  cursor: pointer;
}
/* 二维码悬浮放大展示 */
.footer .footer-qr .qr-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity .2s ease;
}
.footer .footer-qr .qr-box:hover ~ .qr-overlay {
  opacity: 1;
}
.footer .footer-qr .qr-overlay-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.55);
}
.footer .footer-qr .qr-overlay-card {
  position: relative; z-index: 1;
  background: var(--surface-gradient);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  text-align: center;
  animation: fadeUp .2s ease;
}
.footer .footer-qr .qr-overlay-card img {
  display: inline-block; width: auto; height: auto; max-width: 260px;
}
.footer .footer-qr .qr-overlay-card p {
  margin-top: var(--spacing-md);
  font-size: var(--text-base); color: var(--text-secondary);
}
.footer .footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: var(--spacing-lg); text-align: center;
  font-size: var(--text-xs); color: var(--text-muted);
}
.footer .footer-bottom a { color: var(--footer-text); transition: color var(--transition); }
.footer .footer-bottom a:hover { color: #fff; }

/* ============================================================
   HELPER
   ============================================================ */
.text-muted   { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-danger  { color: var(--danger); }
.text-sm      { font-size: var(--text-sm); }
.text-xs      { font-size: var(--text-xs); }
.text-center  { text-align: center; }
.fw-600       { font-weight: 600; }
.phcolor      { color: var(--gray-400); }
.mb-sm  { margin-bottom: var(--spacing-sm); }
.mb-md  { margin-bottom: var(--spacing-md); }
.mb-lg  { margin-bottom: var(--spacing-lg); }
.mt-lg  { margin-top: var(--spacing-lg); }
.mt-xl  { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.divider-section {
  text-align: center; padding: 10px; font-weight: 600; border-radius: var(--radius);
  font-size: var(--text-sm); margin: var(--spacing-xl) 0 var(--spacing-lg);
  background: var(--gray-50); border: 1px solid var(--border);
  color: var(--text-secondary); letter-spacing: 1px;
}
.section-gray { background: linear-gradient(180deg, #F7F8FA 0%, #F0F2F5 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); box-shadow: inset 0 2px 4px rgba(0,0,0,.02); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .course-grid { grid-template-columns: repeat(3, 1fr); }
  .info-grid { grid-template-columns: 1fr; }
  .footer .footer-grid { grid-template-columns: 1fr 1fr; }
  .cert-query-card .cq-fields { grid-template-columns: 1fr; }
  .cert-query-card:hover .cq-expand,
  .cert-query-card:focus-within .cq-expand { max-height: 520px; }
}
@media (max-width: 768px) {
  .course-grid { grid-template-columns: 1fr; }
  .footer .footer-grid { grid-template-columns: 1fr; }
  .layout-main .container { flex-direction: column; }
  .sidebar { width: 100%; position: static; }
  .header .container { flex-wrap: wrap; gap: var(--spacing-sm); }
  .header .search-box { max-width: 100%; order: 3; }
  .service-nav .container { flex-direction: column; }
  .service-nav .sn-label { border-right: none; border-bottom: 1px solid var(--border); padding-right: 0; padding-bottom: var(--spacing-sm); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}