:root {
  color-scheme: light;
  --orange: #f2690d;
  --orange-deep: #d94f00;
  --green: #5d8f22;
  --ink: #17120f;
  --muted: #6f675f;
  --paper: #fffaf3;
  --line: #eadfd3;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.65; }
a { color: inherit; }
img { display: block; max-width: 100%; }

.site-header { min-height: 76px; padding: 12px clamp(20px, 5vw, 72px); display: flex; align-items: center; justify-content: space-between; background: rgba(255,250,243,.96); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; backdrop-filter: blur(16px); }
.brand { display: flex; gap: 12px; align-items: center; font-weight: 800; text-decoration: none; }
.brand img { border-radius: 11px; }
.header-download { text-decoration: none; color: var(--orange-deep); font-weight: 750; }

.hero { min-height: calc(92vh - 76px); background: var(--orange); color: white; display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(260px, .8fr); align-items: center; gap: clamp(30px, 7vw, 110px); padding: clamp(46px, 8vw, 110px) clamp(20px, 8vw, 130px); overflow: hidden; }
.hero-copy { max-width: 760px; }
.eyebrow { text-transform: uppercase; font-size: .86rem; font-weight: 800; letter-spacing: .06em; }
.hero h1 { font-size: clamp(2.8rem, 6vw, 6.5rem); line-height: 1.02; margin: 18px 0 24px; max-width: 920px; }
.hero-lead { font-size: clamp(1.12rem, 2vw, 1.55rem); max-width: 700px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 36px; }
.primary-action, .secondary-action { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border-radius: 7px; text-decoration: none; font-weight: 800; }
.primary-action { background: var(--ink); color: white; }
.secondary-action { border: 2px solid currentColor; }
.hero-logo { width: min(38vw, 520px); justify-self: center; border-radius: 23%; box-shadow: 0 34px 70px rgba(82,31,0,.3); }

.course-band { display: flex; gap: 22px; flex-wrap: wrap; padding: 24px clamp(20px, 8vw, 130px); align-items: center; background: #f4e7d2; border-bottom: 1px solid var(--line); }
.course-band span { font-weight: 800; }
.course-band strong { margin-left: auto; color: var(--green); }

.features { padding: clamp(70px, 9vw, 140px) clamp(20px, 8vw, 130px); }
.section-heading { max-width: 760px; margin-bottom: 60px; }
.section-heading h2 { font-size: clamp(2rem, 4.5vw, 4.5rem); line-height: 1.1; margin: 10px 0; }
.feature-grid { display: grid; gap: 110px; }
.feature { display: grid; grid-template-columns: minmax(260px, .75fr) minmax(280px, 1.25fr); gap: clamp(36px, 8vw, 120px); align-items: center; }
.feature-reverse .feature-copy { order: 2; }
.feature img { width: min(100%, 560px); justify-self: center; border-radius: 22px; box-shadow: 0 24px 70px rgba(67,45,29,.16); }
.feature-copy span { color: var(--orange); font-weight: 900; }
.feature-copy h3 { font-size: clamp(1.9rem, 4vw, 3.8rem); line-height: 1.1; margin: 10px 0 18px; }
.feature-copy p { color: var(--muted); font-size: 1.08rem; }

footer { display: flex; gap: 40px; justify-content: space-between; padding: 50px clamp(20px, 8vw, 130px); background: var(--ink); color: white; }
footer p { color: #cfc5bd; }
footer nav { display: flex; gap: 20px; flex-wrap: wrap; align-content: flex-start; }

.privacy-page { max-width: 900px; margin: 0 auto; padding: 80px 24px 110px; }
.privacy-page h1 { font-size: clamp(2.6rem, 7vw, 5rem); margin: 10px 0 24px; }
.privacy-page section { margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--line); }
.privacy-page h2 { font-size: 1.45rem; }
.privacy-page p { color: #4f4842; }
.privacy-page a { color: var(--orange-deep); }
.not-found { min-height: 75vh; display: grid; place-items: center; align-content: center; gap: 20px; text-align: center; padding: 30px; }
.not-found img { border-radius: 22px; }

@media (max-width: 760px) {
  .site-header { min-height: 66px; }
  .brand span { max-width: 180px; line-height: 1.2; }
  .hero { min-height: calc(92vh - 66px); grid-template-columns: 1fr; align-content: center; padding-top: 58px; }
  .hero-logo { width: min(68vw, 330px); order: -1; }
  .hero h1 { font-size: clamp(2.7rem, 12vw, 4.5rem); }
  .course-band strong { width: 100%; margin-left: 0; }
  .feature, .feature-reverse { grid-template-columns: 1fr; gap: 28px; }
  .feature-reverse .feature-copy { order: initial; }
  .feature-grid { gap: 80px; }
  footer { flex-direction: column; }
}