:root {
  --ink: #080808;
  --paper: #ffffff;
  --soft: #f3f5f8;
  --line: #dfe4ec;
  --blue: #075cff;
  --blue-dark: #003ab7;
  --muted: #5f6673;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
  line-height: 1.6;
}

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

img {
  display: block;
  max-width: 100%;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  font-weight: 900;
  letter-spacing: 0;
}

.nav nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

.nav nav a:hover {
  color: var(--blue);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 520px);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  padding: clamp(52px, 8vw, 100px) clamp(20px, 4vw, 56px) 42px;
  max-width: 1240px;
  margin: 0 auto;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(42px, 7vw, 78px);
  line-height: 1.02;
  letter-spacing: 0;
  font-weight: 950;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.1;
  letter-spacing: 0;
  font-weight: 950;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.28;
  font-weight: 900;
}

.lead {
  max-width: 660px;
  color: #272d36;
  font-size: clamp(18px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 14px;
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  padding: 13px 22px;
  font-weight: 900;
  box-shadow: 5px 5px 0 var(--ink);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 var(--ink);
}

.button.primary {
  background: var(--blue);
  color: white;
}

.button.secondary {
  background: white;
}

.button.large {
  min-width: 220px;
}

.microcopy {
  color: var(--muted);
  font-size: 14px;
}

.product-wrap {
  position: relative;
}

.product-wrap::before {
  content: "";
  position: absolute;
  inset: 8% -4% 2% 8%;
  z-index: -1;
  background: var(--blue);
  opacity: 0.12;
  transform: rotate(-4deg);
}

.product-wrap img {
  border: 2px solid var(--ink);
  box-shadow: 14px 14px 0 var(--ink);
}

.section {
  padding: clamp(54px, 8vw, 96px) clamp(20px, 4vw, 56px);
  max-width: 1180px;
  margin: 0 auto;
}

.section-intro {
  max-width: 760px;
  margin-bottom: 34px;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

article,
.offer-item,
.timeline div,
details,
.thanks-card {
  border: 2px solid var(--ink);
  background: white;
}

article {
  padding: 24px;
  box-shadow: 6px 6px 0 var(--ink);
}

article p,
.offer-item p,
.timeline p,
.split li,
details p,
.promise-panel p,
.cta-box p,
.thanks-card p,
.thanks-card li {
  color: #333b46;
}

.promise {
  max-width: none;
  background: var(--ink);
  color: white;
}

.promise-panel {
  max-width: 1060px;
  margin: 0 auto;
}

.promise-panel p {
  max-width: 840px;
  color: #d9dee8;
  font-size: 20px;
}

.offer-list {
  display: grid;
  gap: 16px;
}

.offer-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  padding: 22px;
}

.offer-item span {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  background: var(--blue);
  color: white;
  border: 2px solid var(--ink);
  font-weight: 950;
}

.curriculum {
  max-width: none;
  background: var(--soft);
}

.curriculum .section-intro,
.timeline {
  max-width: 1120px;
  margin-left: auto;
  margin-right: auto;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.timeline div {
  padding: 18px;
}

.timeline strong {
  color: var(--blue);
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: 950;
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.split > div {
  border-left: 6px solid var(--blue);
  padding: 4px 0 4px 24px;
}

ul,
ol {
  padding-left: 1.3rem;
}

li + li {
  margin-top: 10px;
}

.cta {
  max-width: none;
  background: var(--blue);
}

.cta-box {
  max-width: 900px;
  margin: 0 auto;
  color: white;
  text-align: center;
}

.cta-box .eyebrow,
.cta-box p {
  color: white;
}

.cta-box .button {
  margin-top: 10px;
}

.faq {
  max-width: 900px;
}

details {
  padding: 20px 22px;
}

details + details {
  margin-top: 12px;
}

summary {
  cursor: pointer;
  font-weight: 900;
  font-size: 18px;
}

details p {
  margin: 12px 0 0;
}

.footer {
  padding: 28px clamp(20px, 4vw, 56px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.thanks-page {
  min-height: 100vh;
  background: var(--soft);
}

.thanks {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0;
}

.thanks-card {
  margin-top: 34px;
  padding: clamp(28px, 6vw, 56px);
  box-shadow: 10px 10px 0 var(--ink);
}

.thanks-card h1 {
  font-size: clamp(34px, 6vw, 58px);
}

.next-steps {
  margin: 28px 0;
  padding: 22px;
  background: var(--soft);
  border-left: 6px solid var(--blue);
}

.next-steps h2 {
  font-size: 24px;
}

@media (max-width: 880px) {
  .nav {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
    white-space: nowrap;
  }

  .hero,
  .grid.three,
  .timeline,
  .split {
    grid-template-columns: 1fr;
  }

  .product-wrap {
    order: -1;
  }

  .product-wrap img {
    box-shadow: 8px 8px 0 var(--ink);
  }
}

@media (max-width: 560px) {
  .hero-actions,
  .button {
    width: 100%;
  }

  .offer-item {
    grid-template-columns: 1fr;
  }
}