:root {
  --primary: #660874;
  --primary-dark: #4d0657;
  --primary-light: #f6ecf8;
  --accent: #c8102e;
  --text: #333;
  --text-light: #777;
  --bg: #f7f7f9;
  --white: #fff;
  --border: #e5e5ea;
  --radius: 8px;
  --shadow: 0 2px 10px rgba(0, 0, 0, .07);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--accent); }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* ============ 顶部通栏 ============ */
.topbar {
  background: var(--primary-dark);
  color: #ddd;
  font-size: 13px;
  padding: 6px 0;
}
.topbar .container { display: flex; justify-content: space-between; flex-wrap: wrap; }
.topbar a { color: #fff; }

/* ============ 头部 ============ */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-badge {
  width: 46px; height: 46px;
  background: var(--primary);
  color: #fff;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 700;
  flex-shrink: 0;
}
.logo-text { font-size: 20px; font-weight: 700; color: var(--text); }
.logo-text span { color: var(--primary); }
.logo-sub { font-size: 12px; color: var(--text-light); font-weight: 400; letter-spacing: 2px; }
.header-tel { text-align: right; font-size: 13px; color: var(--text-light); }
.header-tel strong { display: block; font-size: 20px; color: var(--accent); }

.main-nav { background: var(--primary); }
.main-nav ul { display: flex; justify-content: center; }
.main-nav a {
  display: block;
  color: #fff;
  padding: 12px 26px;
  font-size: 16px;
  font-weight: 500;
}
.main-nav a:hover, .main-nav a.active { background: var(--primary-dark); color: #fff; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  font-size: 22px;
  padding: 4px 12px;
  cursor: pointer;
  color: var(--primary);
  border-radius: 4px;
}

/* ============ Banner ============ */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #8a2ba0 55%, #a13ab8 100%);
  color: #fff;
  padding: 64px 0 72px;
  text-align: center;
}
.hero h1 { font-size: 34px; margin-bottom: 14px; letter-spacing: 2px; }
.hero p { font-size: 17px; opacity: .92; max-width: 720px; margin: 0 auto 28px; }
.hero .hero-tags { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 30px; }
.hero .hero-tags span {
  background: rgba(255, 255, 255, .16);
  border: 1px solid rgba(255, 255, 255, .35);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 14px;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 34px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 6px 16px rgba(200, 16, 46, .35); }
.btn-outline {
  background: transparent;
  border: 1px solid #fff;
  margin-left: 12px;
}
.btn-outline:hover { background: rgba(255,255,255,.12); box-shadow: none; }

/* ============ 区块通用 ============ */
.section { padding: 56px 0; }
.section.gray { background: var(--bg); }
.section-head { text-align: center; margin-bottom: 36px; }
.section-head h2 { font-size: 28px; color: var(--text); }
.section-head h2::after {
  content: "";
  display: block;
  width: 56px; height: 3px;
  background: var(--primary);
  margin: 12px auto 0;
}
.section-head p { color: var(--text-light); margin-top: 10px; font-size: 15px; }

/* ============ 课程卡片 ============ */
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.course-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.course-card .cc-head {
  background: var(--primary-light);
  padding: 16px 18px;
  border-left: 4px solid var(--primary);
}
.course-card .cc-head h3 { font-size: 17px; color: var(--primary-dark); line-height: 1.45; }
.course-card .cc-body { padding: 16px 18px; flex: 1; }
.course-card .cc-body li {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  padding: 5px 0;
  border-bottom: 1px dashed var(--border);
}
.course-card .cc-body li:last-child { border-bottom: none; }
.course-card .cc-body .k { color: var(--text-light); }
.course-card .cc-body .v { color: var(--text); font-weight: 500; text-align: right; }
.course-card .cc-body .v.price { color: var(--accent); font-size: 16px; font-weight: 700; }
.course-card .cc-foot { padding: 0 18px 16px; display: flex; gap: 10px; }
.btn-sm { padding: 8px 18px; font-size: 14px; border-radius: 20px; }
.btn-ghost {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  border-radius: 20px;
  border: 1px solid var(--primary);
  color: var(--primary);
}
.btn-ghost:hover { background: var(--primary); color: #fff; }

/* ============ 优势 ============ */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.adv-item {
  background: var(--white);
  text-align: center;
  padding: 30px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.adv-item .num { font-size: 34px; font-weight: 700; color: var(--primary); }
.adv-item h3 { font-size: 17px; margin: 8px 0 6px; }
.adv-item p { font-size: 13px; color: var(--text-light); }

/* ============ 师资 ============ */
.teach-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.teach-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px;
  text-align: center;
}
.teach-item .avatar {
  position: relative;
  width: 132px; height: 156px;
  margin: 0 auto 14px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--primary-light);
  border: 1px solid var(--border);
}
.teach-item .avatar img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 18%;
  transition: transform .3s ease;
}
.teach-item:hover .avatar img { transform: scale(1.04); }
.teach-item h3 { font-size: 17px; }
.teach-item .title { font-size: 13px; color: var(--primary); margin: 4px 0; }
.teach-item p { font-size: 13px; color: var(--text-light); }

/* ============ 新闻 / 问答列表 ============ */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.news-list li { border-bottom: 1px dashed var(--border); }
.news-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 13px 2px;
  color: var(--text);
}
.news-list a:hover { color: var(--accent); }
.news-list .n-title { flex: 1; font-size: 15px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.news-list .n-date { color: var(--text-light); font-size: 13px; flex-shrink: 0; }

.faq-mini { }
.faq-mini details { border-bottom: 1px dashed var(--border); padding: 8px 0; }
.faq-mini summary {
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-left: 22px;
}
.faq-mini summary::before {
  content: "Q";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}
.faq-mini details p { font-size: 14px; color: var(--text-light); padding: 8px 0 4px 22px; }
.more-link { text-align: right; margin-top: 10px; font-size: 14px; }

/* ============ 内页 banner ============ */
.page-banner {
  background: linear-gradient(135deg, var(--primary) 0%, #8a2ba0 100%);
  color: #fff;
  text-align: center;
  padding: 42px 0;
}
.page-banner h1 { font-size: 26px; }
.page-banner p { font-size: 14px; opacity: .85; margin-top: 6px; }

.breadcrumb { font-size: 13px; color: var(--text-light); padding: 14px 0; }
.breadcrumb a { color: var(--text-light); }

/* ============ 文章正文 ============ */
.article { max-width: 860px; margin: 0 auto; }
.article-meta { color: var(--text-light); font-size: 14px; margin-bottom: 22px; }
.article h2.article-title { font-size: 24px; line-height: 1.4; margin-bottom: 12px; }
.article h3 { font-size: 19px; margin: 26px 0 12px; padding-left: 10px; border-left: 4px solid var(--primary); }
.article p { margin-bottom: 14px; font-size: 16px; }
.article ul.dash { margin: 0 0 14px 20px; list-style: disc; }
.article ul.dash li { margin-bottom: 8px; }
.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 15px;
}
.article table th, .article table td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}
.article table th { background: var(--primary-light); color: var(--primary-dark); }

.article-nav { display: flex; justify-content: space-between; border-top: 1px solid var(--border); margin-top: 34px; padding-top: 16px; font-size: 14px; }
.article-nav a { color: var(--text-light); }
.article-nav a:hover { color: var(--accent); }

/* ============ 报名表单 ============ */
.signup-wrap {
  max-width: 720px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 34px 28px;
  box-shadow: var(--shadow);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-group label .req { color: var(--accent); margin-left: 2px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
  background: var(--white);
  color: var(--text);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 90px; }
.form-tip { font-size: 13px; color: var(--text-light); margin-top: 4px; }
.btn-submit { width: 100%; font-size: 17px; padding: 14px; }

.form-msg { display: none; margin-top: 16px; padding: 12px 16px; border-radius: 6px; font-size: 14px; }
.form-msg.ok { display: block; background: #e8f7ec; color: #187a3c; border: 1px solid #bfe6cc; }
.form-msg.err { display: block; background: #fdeaea; color: #b32424; border: 1px solid #f3c1c1; }
.btn-submit:disabled { opacity: .6; cursor: not-allowed; }

/* ============ 页脚 ============ */
.site-footer { background: #2b2330; color: #b8b0be; font-size: 14px; padding: 44px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 30px; padding-bottom: 30px; }
.footer-grid h4 { color: #fff; font-size: 16px; margin-bottom: 14px; }
.footer-grid a { color: #b8b0be; display: block; padding: 3px 0; }
.footer-grid a:hover { color: #fff; }
.footer-grid p { margin-bottom: 8px; }
.footer-bottom { border-top: 1px solid #3d3345; padding: 16px 0; text-align: center; font-size: 13px; color: #877f90; }

/* ============ 悬浮咨询 ============ */
.float-cta {
  position: fixed;
  right: 18px;
  bottom: 24px;
  z-index: 90;
}
.float-cta a {
  display: block;
  background: var(--accent);
  color: #fff;
  padding: 12px 20px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(200, 16, 46, .4);
}

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid, .teach-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .topbar { font-size: 12px; }
  .topbar .container span.hide-m { display: none; }
  .header-tel strong { font-size: 16px; }
  .nav-toggle { display: block; }
  .main-nav { display: none; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav a { text-align: center; padding: 12px; border-top: 1px solid rgba(255,255,255,.12); }
  .hero { padding: 40px 0 48px; }
  .hero h1 { font-size: 24px; }
  .hero p { font-size: 15px; }
  .btn-outline { margin-left: 0; margin-top: 10px; }
  .section { padding: 36px 0; }
  .section-head h2 { font-size: 22px; }
  .course-grid { grid-template-columns: 1fr; }
  .adv-grid, .teach-grid { grid-template-columns: 1fr; }
  .teach-item .avatar { width: 156px; height: 184px; }
  .two-col { grid-template-columns: 1fr; gap: 30px; }
  .form-row { grid-template-columns: 1fr; }
  .signup-wrap { padding: 24px 18px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .article h2.article-title { font-size: 20px; }
  .article p { font-size: 15px; }
  .float-cta a { padding: 10px 16px; font-size: 14px; }
}