/* 斯恩教育 · 青少儿编程板块 · 共享样式 */
/* 适用于 sien-coding/ 下所有二级页面 */

/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background: #F7F8FA;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ========== Colors ========== */
:root {
  --primary:    #2B5DAE;   /* 品牌蓝 */
  --primary-dk: #1A3F7A;   /* 深蓝 hover */
  --accent:     #F5A623;   /* 强调橙 */
  --accent-dk:  #D4890A;
  --bg:         #F7F8FA;
  --white:      #FFFFFF;
  --gray-100:   #F0F2F5;
  --gray-300:   #D1D5DB;
  --gray-500:   #6B7280;
  --gray-700:   #374151;
  --gray-900:   #111827;
  --green:      #10B981;
  --red:        #EF4444;
  --radius:     12px;
  --shadow:     0 4px 24px rgba(0,0,0,0.08);
}

/* ========== Header ========== */
.site-header {
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 64px;
}
.site-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--primary); }
.site-logo img { height: 40px; }
.header-nav { display: flex; gap: 28px; align-items: center; }
.header-nav a {
  font-size: 15px; color: var(--gray-700); transition: color .2s;
  font-weight: 500;
}
.header-nav a:hover { color: var(--primary); }
.header-nav .nav-cta {
  background: var(--accent); color: #fff; padding: 8px 20px; border-radius: 24px;
  font-weight: 600; transition: background .2s;
}
.header-nav .nav-cta:hover { background: var(--accent-dk); }

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-700); margin: 5px 0; }

@media (max-width: 768px) {
  .header-nav {
    display: none; flex-direction: column; position: absolute;
    top: 64px; left: 0; right: 0; background: var(--white);
    padding: 16px 24px; box-shadow: var(--shadow);
  }
  .header-nav.open { display: flex; }
  .nav-toggle { display: block; }
}

/* ========== Banner / Hero ========== */
.page-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dk) 100%);
  color: #fff; text-align: center;
  padding: 80px 24px 64px;
}
.page-banner h1 {
  font-size: 36px; font-weight: 800; margin-bottom: 16px;
  letter-spacing: 1px;
}
.page-banner p { font-size: 18px; opacity: 0.9; margin-bottom: 32px; max-width: 640px; margin-left: auto; margin-right: auto; }
.banner-cta {
  display: inline-flex; gap: 16px; flex-wrap: wrap; justify-content: center;
}
.btn {
  display: inline-block; padding: 14px 36px; border-radius: 30px;
  font-size: 16px; font-weight: 600; transition: all .2s; cursor: pointer;
  border: none; text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dk); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245,166,35,0.4); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.6); }
.btn-outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; }

/* ========== Section ========== */
.section { padding: 64px 24px; max-width: 1200px; margin: 0 auto; }
.section-title {
  font-size: 28px; font-weight: 700; text-align: center; color: var(--gray-900);
  margin-bottom: 12px;
}
.section-subtitle {
  text-align: center; color: var(--gray-500); font-size: 16px; margin-bottom: 48px;
}
.bg-white { background: var(--white); }
.bg-gray  { background: var(--bg); }

/* ========== 3-Column Grid ========== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } .grid-2 { grid-template-columns: 1fr; } }

/* ========== Selling Point Cards ========== */
.selling-card {
  background: var(--white); border-radius: var(--radius); padding: 32px 24px;
  box-shadow: var(--shadow); text-align: center; transition: transform .2s;
}
.selling-card:hover { transform: translateY(-4px); }
.selling-icon { font-size: 40px; margin-bottom: 16px; }
.selling-card h3 { font-size: 18px; color: var(--primary); margin-bottom: 12px; }
.selling-card p { color: var(--gray-500); font-size: 14px; line-height: 1.8; }

/* ========== Audience Cards ========== */
.audience-card {
  background: var(--white); border-radius: var(--radius); padding: 28px 24px;
  box-shadow: var(--shadow); display: flex; gap: 16px; align-items: flex-start;
}
.audience-icon { font-size: 32px; flex-shrink: 0; }
.audience-card h4 { font-size: 16px; color: var(--gray-900); margin-bottom: 8px; }
.audience-card p { color: var(--gray-500); font-size: 14px; line-height: 1.8; }

/* ========== Course Table ========== */
.course-table-wrapper { overflow-x: auto; margin: 32px 0; }
.course-table {
  width: 100%; border-collapse: collapse; background: var(--white);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.course-table th {
  background: var(--primary); color: #fff; padding: 14px 16px;
  font-size: 14px; text-align: left; white-space: nowrap;
}
.course-table td { padding: 12px 16px; font-size: 14px; border-bottom: 1px solid var(--gray-100); }
.course-table tr:last-child td { border-bottom: none; }
.course-table tr:hover td { background: #F0F5FF; }

/* ========== Info Table ========== */
.info-table { width: 100%; max-width: 640px; margin: 0 auto; }
.info-table td {
  padding: 12px 16px; border-bottom: 1px solid var(--gray-100);
  font-size: 15px;
}
.info-table td:first-child { font-weight: 600; color: var(--primary); white-space: nowrap; width: 140px; }

/* ========== Outcome List ========== */
.outcome-list { max-width: 640px; margin: 0 auto; }
.outcome-list li {
  padding: 10px 0 10px 32px; position: relative; font-size: 15px;
  color: var(--gray-700);
}
.outcome-list li::before {
  content: "✅"; position: absolute; left: 0; top: 10px; font-size: 16px;
}

/* ========== Competition Roadmap ========== */
.roadmap {
  display: flex; flex-direction: column; gap: 0; max-width: 600px; margin: 0 auto;
}
.roadmap-step {
  display: flex; align-items: center; gap: 20px; padding: 16px 0;
  border-left: 3px solid var(--primary); padding-left: 24px; position: relative;
}
.roadmap-step::before {
  content: ""; position: absolute; left: -8px; top: 20px;
  width: 14px; height: 14px; background: var(--primary); border-radius: 50%;
  border: 3px solid #fff; box-shadow: 0 0 0 2px var(--primary);
}
.roadmap-step h4 { font-size: 15px; color: var(--primary); margin-bottom: 4px; }
.roadmap-step p { font-size: 13px; color: var(--gray-500); }

/* ========== Comparison Table ========== */
.compare-table {
  width: 100%; border-collapse: collapse; background: var(--white);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.compare-table th {
  background: var(--primary); color: #fff; padding: 14px; font-size: 14px;
}
.compare-table td { padding: 12px 14px; font-size: 14px; border-bottom: 1px solid var(--gray-100); }
.compare-table tr:last-child td { border-bottom: none; }

/* ========== Schedule Block ========== */
.schedule-block {
  background: var(--white); border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); margin-bottom: 20px;
}
.schedule-block h4 { font-size: 16px; color: var(--primary); margin-bottom: 12px; }
.schedule-block ul { padding-left: 20px; }
.schedule-block li { font-size: 14px; color: var(--gray-700); margin-bottom: 6px; }

/* ========== Stats Row ========== */
.stats-row {
  display: flex; justify-content: center; gap: 48px; flex-wrap: wrap;
  padding: 32px 0;
}
.stat-item { text-align: center; }
.stat-num { font-size: 40px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 14px; color: var(--gray-500); margin-top: 4px; }

/* ========== FAQ ========== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--white); border-radius: var(--radius); margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04); overflow: hidden;
}
.faq-q {
  padding: 18px 24px; font-size: 15px; font-weight: 600; color: var(--gray-900);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  background: none; border: none; width: 100%; text-align: left;
}
.faq-q::after { content: "+"; font-size: 22px; color: var(--primary); flex-shrink: 0; margin-left: 12px; }
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { padding: 0 24px 18px; font-size: 14px; color: var(--gray-500); line-height: 1.8; display: none; }
.faq-item.open .faq-a { display: block; }

/* ========== Contact Bar ========== */
.contact-bar {
  background: var(--primary); color: #fff; text-align: center;
  padding: 48px 24px;
}
.contact-bar h2 { font-size: 26px; margin-bottom: 12px; }
.contact-bar p { font-size: 16px; opacity: 0.85; margin-bottom: 28px; }
.contact-phone {
  display: inline-block; font-size: 28px; font-weight: 800; color: var(--accent);
  margin-bottom: 8px;
}
.contact-detail { font-size: 14px; opacity: 0.8; margin-bottom: 4px; }

/* ========== Footer ========== */
.site-footer {
  background: var(--gray-900); color: rgba(255,255,255,0.7); font-size: 13px;
  padding: 48px 24px 24px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand h3 { color: #fff; font-size: 18px; margin-bottom: 8px; }
.footer-brand p { font-size: 13px; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 12px; }
.footer-col a { display: block; padding: 3px 0; font-size: 13px; transition: color .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 16px;
  text-align: center; font-size: 12px; line-height: 2;
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--accent); }

/* ========== Responsive ========== */
@media (max-width: 600px) {
  .page-banner { padding: 56px 16px 48px; }
  .page-banner h1 { font-size: 24px; }
  .page-banner p { font-size: 14px; }
  .section { padding: 40px 16px; }
  .section-title { font-size: 22px; }
  .btn { padding: 12px 24px; font-size: 14px; }
}