:root {
  --ink: #192c23;
  --muted: #647267;
  --green: #2f6f52;
  --deep: #285d46;
  --line: #dce2d3;
  --marker: #dfff72;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(160deg, #fffdf6, #f7eed6);
  min-height: 100svh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid #689d69; outline-offset: 4px; }
.shell { width: min(1260px, calc(100% - 64px)); margin: 0 auto; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 60px;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 800; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 29px;
  height: 29px;
  border-radius: 9px;
  color: #fff;
  background: var(--green);
  font-size: 14px;
}
.top-note { color: var(--muted); font-size: 12px; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 24px; padding: 28px 0; }
.eyebrow { margin: 0 0 8px; color: var(--deep); font-size: 12px; font-weight: 700; letter-spacing: .06em; }
h1 { margin: 0; font-size: clamp(34px, 4.2vw, 52px); line-height: 1.18; letter-spacing: -.045em; font-weight: 850; }
.highlight { position: relative; isolation: isolate; white-space: nowrap; }
.highlight::after { content: ""; position: absolute; z-index: -1; left: -3px; right: -3px; bottom: 1px; height: .25em; background: var(--marker); border-radius: 12px 3px; }
.hero-copy { margin: 10px 0 0; color: #53615a; font-size: 14px; font-weight: 550; }
.countdown { display: flex; align-items: center; gap: 18px; padding: 13px 17px; border-radius: 13px; color: #e7f4ed; background: #206b79; }
.countdown-label { font-size: 12px; font-weight: 700; white-space: nowrap; }
.countdown-number { font-size: 30px; line-height: 1; color: var(--marker); font-family: Consolas, monospace; letter-spacing: -.04em; white-space: nowrap; }

.featured-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 22px; }
.feature-card {
  --feature-ink: #305576;
  --feature-muted: #536b80;
  --feature-border: #c8d8e7;
  --feature-hover: #8daec9;
  --feature-arrow: #f6faff;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-width: 0;
  padding: 22px 24px 18px;
  border-radius: 17px;
  border: 1px solid var(--feature-border);
  background: #e7eff8;
  transition: border-color .15s, box-shadow .15s;
}
.career-entry {
  --feature-ink: #7a4d32;
  --feature-muted: #805f4c;
  --feature-border: #e9ceb7;
  --feature-hover: #c89c7e;
  --feature-arrow: #fff8ef;
  background: #f8e6d7;
}
.feature-card:hover { border-color: var(--feature-hover); box-shadow: 0 6px 20px #34302a0c; }
.feature-card:focus-visible { outline-color: var(--feature-ink); }
.feature-eyebrow { color: var(--feature-muted); font-size: 12px; font-weight: 700; letter-spacing: .04em; }
.feature-card h2 { margin: 7px 0; font-size: clamp(21px, 2vw, 26px); line-height: 1.35; letter-spacing: -.02em; color: var(--feature-ink); }
.feature-card h2 span { display: inline-block; margin-left: 8px; color: var(--feature-muted); font-size: 15px; font-weight: 600; letter-spacing: 0; }
.feature-card p { margin: 0 0 14px; color: var(--feature-muted); font-size: 13px; line-height: 1.7; max-width: 530px; }
.feature-action { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: auto; color: var(--feature-ink); font-weight: 750; font-size: 13px; }
.round-arrow { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--feature-arrow); border: 1px solid var(--feature-border); font-size: 17px; }

.tools { margin-top: 0; }
.section-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 12px; }
.section-head h2 { margin: 0; font-size: 19px; letter-spacing: -.02em; }
.study-note { color: var(--muted); font-size: 12px; }
.tool-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.tool-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 17px;
  background: var(--green);
  border: 1px solid #3e7c5e;
  border-radius: 15px;
  color: #f5faf6;
  transition: background .15s, box-shadow .15s;
}
.tool-card:hover { background: #296548; box-shadow: 0 5px 15px #234f381c; }
.tool-card:focus-visible { outline-color: #8bb568; }
.card-content { min-width: 0; }
.tool-card h3 { margin: 0 0 8px; font-size: 17px; line-height: 1.4; letter-spacing: -.03em; }
.tool-card p { margin: 0; color: #deebe2; font-size: 12px; line-height: 1.7; }
.card-action { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: auto; padding-top: 16px; color: #e2f1df; font-size: 12px; font-weight: 700; }
.arrow { display: grid; place-items: center; flex: 0 0 26px; width: 26px; height: 26px; border-radius: 50%; background: #e3efdc; color: #285d46; font-size: 16px; }

.contact { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 20px 0 12px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 13px; background: #fffef8; }
.contact-text { display: flex; align-items: baseline; flex-wrap: wrap; gap: 5px 15px; }
.contact-label { font-weight: 750; color: var(--deep); font-size: 13px; }
.contact-copy { margin: 0; color: var(--muted); font-size: 12px; }
.wechat-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 22px; flex-shrink: 0; min-height: 44px; padding: 8px 12px; border: 0; border-radius: 9px; color: #fff; background: var(--green); cursor: pointer; font-family: Consolas, monospace; font-size: 14px; font-weight: 700; }
.wechat-button span { font-family: "Microsoft YaHei", sans-serif; font-size: 11px; }
.wechat-button:hover { background: var(--deep); }
footer { display: flex; justify-content: space-between; align-items: center; gap: 10px; min-height: 44px; padding-block: 10px; color: var(--muted); border-top: 1px solid var(--line); font-size: 11px; }
footer > strong { color: #52634f; font-weight: 600; }
.maker strong { display: inline-block; margin-right: 5px; padding: 1px 7px; background: var(--marker); border: 1px solid #759466; border-radius: 999px; color: #253b25; }

.course-shell { max-width: 960px; }
.back-link { color: var(--deep); font-size: 13px; font-weight: 700; }
.catalog-hero { padding: 40px 0 28px; }
.catalog-hero h1 { font-size: clamp(28px, 4vw, 42px); line-height: 1.4; }
.catalog-hero p:last-child { margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.catalog-panel { padding: 24px 30px; border-radius: 18px; border: 1px solid #d6dfd0; background: #fffef9; margin-bottom: 26px; }
.chapter + .chapter { margin-top: 26px; }
.chapter h3 { margin: 0 0 12px; font-size: 17px; color: var(--deep); }
.chapter ol { margin: 0; padding: 0; list-style: none; }
.lesson-link { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 19px 6px; border-top: 1px solid #e3e8d9; font-size: 16px; }
.lesson-link:hover { background: #f1f5e9; }
.lesson-number { font: 12px Consolas, monospace; color: #73816d; }
.lesson-action { white-space: nowrap; font-size: 12px; color: var(--deep); }
.catalog-footer { margin-bottom: 20px; color: var(--muted); font-size: 13px; }

@media (min-width: 701px) and (max-width: 1100px) {
  .tool-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .tool-card { grid-column: span 2; }
  .tool-card:nth-child(n+4) { grid-column: span 3; }
  .tool-card { padding: 15px; }
  .hero { gap: 18px; }
  h1 { font-size: 39px; }
  .countdown { gap: 10px; padding: 12px; }
  .countdown-number { font-size: 26px; }
}
@media (max-width: 700px) {
  .shell { width: calc(100% - 28px); }
  .topbar { min-height: 54px; }
  .top-note { display: none; }
  .hero { grid-template-columns: 1fr; gap: 16px; padding: 20px 0; }
  h1 { font-size: clamp(30px, 8.5vw, 42px); }
  .eyebrow { font-size: 11px; }
  .hero-copy { font-size: 13px; }
  .countdown { justify-content: space-between; padding: 10px 13px; }
  .countdown-number { font-size: 25px; }
  .featured-grid { grid-template-columns: 1fr; gap: 10px; }
  .feature-card { padding: 16px 18px 14px; border-radius: 14px; }
  .feature-card h2 { font-size: 22px; }
  .feature-card p { margin-bottom: 10px; font-size: 13px; }
  .section-head h2 { font-size: 18px; }
  .study-note { font-size: 11px; }
  .tool-grid { grid-template-columns: 1fr; gap: 9px; }
  .tool-card { display: grid; grid-template-columns: minmax(0, 1fr) 27px; gap: 10px; padding: 14px; }
  .tool-card h3 { margin-top: 0; margin-bottom: 4px; font-size: 16px; }
  .tool-card p { font-size: 12px; }
  .card-action { align-self: center; margin: 0; padding: 0; }
  .action-label { display: none; }
  .contact { gap: 12px; padding: 12px; }
  .contact-text { display: block; }
  .contact-label { display: inline-block; margin-bottom: 3px; }
  .contact-copy { font-size: 11px; }
  .wechat-button { gap: 10px; padding: 8px 10px; }
  footer > strong { display: none; }
  footer { justify-content: center; }
  .catalog-hero { padding: 26px 0 20px; }
  .catalog-panel { padding: 20px 16px; }
  .lesson-link { grid-template-columns: 22px minmax(0, 1fr) auto; gap: 6px; font-size: 14px; }
  .lesson-action { font-size: 11px; }
  .chapter h3 { font-size: 15px; }
  .back-link { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .feature-card, .tool-card { transition: none; }
}