:root {
  --bg: #FBF7F0;
  --surface: #FFFFFF;
  --primary: #5BA84F;
  --primary-dark: #4A8C40;
  --accent: #F2913D;
  --text: #2B2B28;
  --muted: #7A756E;
  --border: #ECE5D8;
  --radius: 16px;
  --maxw: 1080px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 247, 240, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { flex: none; }
.brand-mark-img {
  display: block;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  flex: none;
  background: var(--surface);
}
.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-name small {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 22px;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}
.nav-links a { color: var(--text); transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-cta:hover { background: var(--primary-dark); }

/* Layout */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 20px;
}
.container.narrow { max-width: 760px; }
.container.center { text-align: center; }

.section { background: var(--bg); }
.section-alt { background: #F4EFE4; }

/* Hero */
.hero {
  background:
    radial-gradient(900px 420px at 80% -10%, rgba(91,168,79,0.16), transparent 60%),
    radial-gradient(700px 360px at 0% 10%, rgba(242,145,61,0.12), transparent 55%),
    var(--bg);
  padding: 96px 20px 88px;
}
.hero-inner { max-width: 760px; margin: 0 auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--primary-dark);
  background: rgba(91,168,79,0.12);
  padding: 6px 14px;
  border-radius: 999px;
  margin: 0 0 22px;
}
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}
.lede {
  font-size: clamp(1rem, 2.4vw, 1.18rem);
  color: var(--muted);
  margin: 0 auto 32px;
  max-width: 620px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.slogan {
  margin-top: 34px;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--accent);
  font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(91,168,79,0.28);
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 16px 38px; font-size: 1.08rem; }

/* Section headings */
.section h2, .cta h2 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  margin: 0 0 14px;
  text-align: center;
}
.section-lede {
  text-align: center;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 40px;
  font-size: 1.05rem;
}
.container.narrow .section-lede { text-align: left; }

/* Stats */
.stat-row {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 34px;
  text-align: center;
  min-width: 180px;
}
.stat-num {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.stat-label { color: var(--muted); font-size: 0.92rem; }
.stat-num small { font-size: 1rem; font-weight: 700; margin-left: 2px; }

/* About grid */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 40px;
  align-items: center;
  margin-top: 8px;
}
.about-text p { margin: 0 0 16px; font-size: 1.05rem; }
.about-text .tagline {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  margin: 24px 0 0;
}
.stat-row { display: flex; flex-direction: column; gap: 16px; }
.stat-row .stat { min-width: 0; width: 100%; text-align: left; display: flex; align-items: baseline; gap: 14px; }
.stat-row .stat-num { font-size: 2rem; }
.stat-row .stat-label { font-size: 0.95rem; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: 0 14px 30px rgba(43,43,40,0.08); transform: translateY(-3px); }
.card h3 { margin: 0 0 6px; font-size: 1.4rem; }
.card-sub { color: var(--accent); font-size: 0.95rem; margin: 0 0 20px; }
.course-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 16px;
}
.course-list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.96rem;
}
.course-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
}
.card-link {
  color: var(--primary-dark);
  font-weight: 600;
  border-bottom: 2px solid transparent;
}
.card-link:hover { border-bottom-color: var(--primary); }

/* Feature list */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
}
.feature-list li {
  position: relative;
  padding: 14px 0 14px 34px;
  border-top: 1px solid var(--border);
  font-size: 1.05rem;
}
.feature-list li:last-child { border-bottom: 1px solid var(--border); }
.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 14px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Reasons */
.reasons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.reason {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
}
.reason h3 { margin: 0 0 10px; font-size: 1.15rem; color: var(--primary-dark); }
.reason p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* CTA */
.cta {
  background:
    radial-gradient(600px 300px at 50% 0%, rgba(91,168,79,0.18), transparent 60%),
    #2B2B28;
  color: #fff;
  padding: 84px 20px;
}
.cta h2 { color: #fff; }
.cta .section-lede { color: rgba(255,255,255,0.78); }
.cta-note { color: rgba(255,255,255,0.6); font-size: 0.9rem; margin-top: 16px; }

/* Footer */
.site-footer {
  background: #221F1C;
  color: #cfc9c0;
  padding: 48px 20px 28px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-name small { color: rgba(255,255,255,0.5); }
.footer-brand p { margin: 12px 0 0; font-size: 0.9rem; color: rgba(255,255,255,0.55); }
.footer-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-nav a { color: rgba(255,255,255,0.75); font-size: 0.95rem; }
.footer-nav a:hover { color: #fff; }
.copyright {
  text-align: center;
  margin: 36px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

/* Responsive */
@media (max-width: 880px) {
  .reasons { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .nav-links { gap: 14px; font-size: 0.88rem; }
  .nav-links li:not(:last-child) { display: none; }
  .cards { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .reasons { grid-template-columns: 1fr; }
  .course-list { grid-template-columns: 1fr; }
  .container { padding: 56px 18px; }
  .hero { padding: 72px 18px 64px; }
}