/* ===== 全局重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #E8720C;
  --primary-dark: #C45A00;
  --primary-light: #FF9A3C;
  --bg: #FDF8F3;
  --bg-card: #FFFFFF;
  --text: #2D2419;
  --text-light: #6B5D4F;
  --text-muted: #9C8E7F;
  --border: #F0E6DA;
  --shadow: 0 4px 20px rgba(232, 114, 12, 0.08);
  --shadow-hover: 0 8px 30px rgba(232, 114, 12, 0.15);
  --radius: 16px;
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(253, 248, 243, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo {
  font-size: 22px; font-weight: 800; color: var(--primary);
  display: flex; align-items: center; gap: 8px;
}
.logo-icon { font-size: 26px; }
.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--text-light);
  transition: color 0.2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--primary); border-radius: 2px;
}
.nav-cta {
  background: var(--primary); color: #fff !important;
  padding: 9px 22px; border-radius: 10px; font-weight: 600 !important;
  transition: all 0.2s;
}
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }
.mobile-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); }

/* ===== 英雄区 ===== */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(135deg, #FFF5EB 0%, #FDF8F3 50%, #FFEFD9 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: '🎵'; position: absolute; font-size: 200px; opacity: 0.04;
  top: -40px; right: -20px; transform: rotate(-15deg);
}
.hero-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(232, 114, 12, 0.1); color: var(--primary);
  padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 44px; line-height: 1.25; font-weight: 800; margin-bottom: 20px;
}
.hero h1 span { color: var(--primary); }
.hero-sub {
  font-size: 17px; color: var(--text-light); margin-bottom: 32px; line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary); color: #fff;
  padding: 14px 32px; border-radius: 12px; font-size: 16px; font-weight: 700;
  transition: all 0.25s; box-shadow: 0 4px 16px rgba(232, 114, 12, 0.3);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 24px rgba(232, 114, 12, 0.4); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: var(--text);
  padding: 14px 32px; border-radius: 12px; font-size: 16px; font-weight: 600;
  border: 1.5px solid var(--border); transition: all 0.25s;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.hero-stats {
  display: flex; gap: 40px; margin-top: 40px;
}
.hero-stat .num { font-size: 28px; font-weight: 800; color: var(--primary); }
.hero-stat .label { font-size: 13px; color: var(--text-muted); }

/* 英雄区右侧卡片 */
.hero-card {
  background: var(--bg-card); border-radius: 20px; padding: 32px;
  box-shadow: var(--shadow); border: 1px solid var(--border);
}
.hero-card-cover {
  width: 100%; height: 200px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: flex; align-items: center; justify-content: center;
  font-size: 80px; margin-bottom: 20px;
}
.hero-card-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.hero-card-desc { font-size: 14px; color: var(--text-light); margin-bottom: 16px; }
.hero-card-price {
  display: flex; align-items: baseline; gap: 10px; margin-bottom: 16px;
}
.price-now { font-size: 36px; font-weight: 800; color: var(--primary); }
.price-origin { font-size: 16px; color: var(--text-muted); text-decoration: line-through; }
.hero-card-meta { display: flex; gap: 16px; font-size: 13px; color: var(--text-muted); flex-wrap: wrap; }
.hero-card-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== 通用区块 ===== */
.section { padding: 72px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block; color: var(--primary); font-size: 14px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px;
}
.section-title { font-size: 34px; font-weight: 800; margin-bottom: 14px; }
.section-desc { font-size: 16px; color: var(--text-light); max-width: 600px; margin: 0 auto; }

/* ===== 课程亮点 ===== */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 32px 28px;
  border: 1px solid var(--border); transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: rgba(232, 114, 12, 0.1); display: flex; align-items: center; justify-content: center;
  font-size: 28px; margin-bottom: 18px;
}
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== 课程大纲 ===== */
.curriculum { background: #fff; }
.curriculum-list { max-width: 760px; margin: 0 auto; }
.curriculum-item {
  border: 1px solid var(--border); border-radius: 12px; margin-bottom: 12px;
  overflow: hidden; transition: all 0.2s;
}
.curriculum-item:hover { border-color: var(--primary-light); }
.curriculum-header {
  display: flex; align-items: center; gap: 16px; padding: 20px 24px;
  cursor: pointer; background: var(--bg);
}
.curriculum-num {
  width: 36px; height: 36px; border-radius: 50%; background: var(--primary);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px; flex-shrink: 0;
}
.curriculum-title { font-size: 16px; font-weight: 600; flex: 1; }
.curriculum-duration { font-size: 13px; color: var(--text-muted); }
.curriculum-body {
  padding: 0 24px 20px 76px; font-size: 14px; color: var(--text-light);
  display: none;
}
.curriculum-item.open .curriculum-body { display: block; }
.curriculum-item.open .curriculum-header { background: rgba(232, 114, 12, 0.05); }
.curriculum-body ul { list-style: none; }
.curriculum-body li { padding: 4px 0; padding-left: 18px; position: relative; }
.curriculum-body li::before {
  content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: 700;
}

/* ===== 购买区 ===== */
.purchase {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; text-align: center;
}
.purchase .section-title { color: #fff; }
.purchase .section-desc { color: rgba(255,255,255,0.85); }
.purchase-box {
  max-width: 520px; margin: 0 auto; background: #fff; border-radius: 20px;
  padding: 40px; color: var(--text); box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.purchase-price {
  display: flex; align-items: baseline; justify-content: center; gap: 12px; margin-bottom: 8px;
}
.purchase-price .now { font-size: 48px; font-weight: 800; color: var(--primary); }
.purchase-price .origin { font-size: 20px; color: var(--text-muted); text-decoration: line-through; }
.purchase-note { font-size: 14px; color: var(--text-light); margin-bottom: 24px; }
.purchase-list {
  text-align: left; margin-bottom: 28px;
}
.purchase-list li {
  list-style: none; padding: 8px 0; font-size: 15px;
  display: flex; align-items: center; gap: 10px;
}
.purchase-list li::before {
  content: '✓'; color: var(--primary); font-weight: 800; font-size: 16px;
}
.btn-buy {
  display: block; width: 100%; background: var(--primary); color: #fff;
  padding: 16px; border-radius: 12px; font-size: 18px; font-weight: 700;
  text-align: center; transition: all 0.25s;
}
.btn-buy:hover { background: var(--primary-dark); transform: translateY(-2px); }
.purchase-guarantee {
  display: flex; justify-content: center; gap: 24px; margin-top: 20px;
  font-size: 13px; color: var(--text-muted);
}

/* ===== 资讯预览 ===== */
.news-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.news-card {
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: all 0.3s; cursor: pointer;
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.news-cover {
  height: 160px; display: flex; align-items: center; justify-content: center;
  font-size: 56px;
}
.news-cover.c1 { background: linear-gradient(135deg, #FFE0B2, #FFCC80); }
.news-cover.c2 { background: linear-gradient(135deg, #C8E6C9, #A5D6A7); }
.news-cover.c3 { background: linear-gradient(135deg, #BBDEFB, #90CAF9); }
.news-body { padding: 20px 22px; }
.news-tag {
  display: inline-block; font-size: 12px; color: var(--primary);
  background: rgba(232, 114, 12, 0.1); padding: 3px 10px; border-radius: 6px;
  font-weight: 600; margin-bottom: 10px;
}
.news-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.news-card p { font-size: 13px; color: var(--text-light); line-height: 1.6; margin-bottom: 12px; }
.news-meta { font-size: 12px; color: var(--text-muted); display: flex; gap: 12px; }
.news-more { text-align: center; margin-top: 36px; }

/* ===== 页脚 ===== */
.footer {
  background: #2D2419; color: rgba(255,255,255,0.7); padding: 48px 0 28px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 32px;
}
.footer-brand .logo { color: var(--primary-light); margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.7; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { font-size: 14px; transition: color 0.2s; }
.footer a:hover { color: var(--primary-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px;
  text-align: center; font-size: 13px; color: rgba(255,255,255,0.4);
}

/* ===== 文章页 ===== */
.article-header {
  padding: 60px 0 40px; text-align: center;
}
.article-header .news-tag { margin-bottom: 16px; }
.article-header h1 {
  font-size: 32px; font-weight: 800; margin-bottom: 16px; line-height: 1.4;
}
.article-meta { font-size: 14px; color: var(--text-muted); display: flex; justify-content: center; gap: 20px; }
.article-content {
  max-width: 760px; margin: 0 auto; padding: 0 24px 60px;
  font-size: 16px; line-height: 1.9; color: var(--text);
}
.article-content h2 {
  font-size: 24px; font-weight: 700; margin: 36px 0 16px;
  padding-left: 14px; border-left: 4px solid var(--primary);
}
.article-content h3 { font-size: 19px; font-weight: 700; margin: 28px 0 12px; }
.article-content p { margin-bottom: 18px; color: var(--text-light); }
.article-content ul, .article-content ol { margin: 16px 0; padding-left: 24px; }
.article-content li { margin-bottom: 8px; color: var(--text-light); }
.article-content blockquote {
  border-left: 4px solid var(--primary); background: rgba(232, 114, 12, 0.06);
  padding: 16px 20px; margin: 20px 0; border-radius: 0 8px 8px 0;
  color: var(--text-light); font-style: italic;
}
.article-content strong { color: var(--text); }
.article-nav {
  max-width: 760px; margin: 0 auto 60px; padding: 0 24px;
  display: flex; justify-content: space-between; gap: 16px;
}
.article-nav a {
  flex: 1; padding: 16px 20px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; font-size: 14px; transition: all 0.2s;
}
.article-nav a:hover { border-color: var(--primary); color: var(--primary); }
.article-nav .nav-label { font-size: 12px; color: var(--text-muted); display: block; margin-bottom: 4px; }

/* ===== 资讯列表页 ===== */
.news-list { max-width: 800px; margin: 0 auto; }
.news-list-item {
  display: grid; grid-template-columns: 200px 1fr; gap: 24px;
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); margin-bottom: 20px; transition: all 0.3s;
}
.news-list-item:hover { transform: translateX(4px); box-shadow: var(--shadow); }
.news-list-cover {
  display: flex; align-items: center; justify-content: center; font-size: 48px;
}
.news-list-body { padding: 24px 24px 24px 0; }
.news-list-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.news-list-body p { font-size: 14px; color: var(--text-light); margin-bottom: 12px; line-height: 1.7; }
.news-list-meta { font-size: 13px; color: var(--text-muted); display: flex; gap: 16px; }

/* ===== 关于页 ===== */
.about-hero {
  padding: 70px 0; text-align: center;
  background: linear-gradient(135deg, #FFF5EB, #FFEFD9);
}
.about-hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 16px; }
.about-hero p { font-size: 17px; color: var(--text-light); max-width: 600px; margin: 0 auto; }
.about-content { max-width: 800px; margin: 0 auto; }
.about-section { margin-bottom: 48px; }
.about-section h2 {
  font-size: 26px; font-weight: 800; margin-bottom: 18px;
  display: flex; align-items: center; gap: 10px;
}
.about-section p { font-size: 16px; color: var(--text-light); line-height: 1.9; margin-bottom: 14px; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 32px; }
  .features-grid, .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 68px; left: 0; right: 0; background: #fff;
    padding: 20px; gap: 16px; border-bottom: 1px solid var(--border);
  }
  .mobile-toggle { display: block; }
  .news-list-item { grid-template-columns: 1fr; }
  .news-list-cover { height: 140px; }
  .news-list-body { padding: 0 20px 20px; }
}
@media (max-width: 600px) {
  .hero { padding: 50px 0 40px; }
  .hero h1 { font-size: 26px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 26px; }
  .hero-stats { gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .purchase-box { padding: 28px 20px; }
}