:root {
  --navy: #0a315d;
  --blue: #0b67b2;
  --blue-bright: #087bd3;
  --blue-pale: #edf6fc;
  --ink: #172638;
  --muted: #526477;
  --line: #d9e3ec;
  --white: #ffffff;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  line-height: 1.75;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

h2,
p,
dl,
dd {
  margin-top: 0;
}

.hero {
  overflow: hidden;
  padding-bottom: 32px;
  background: #eef6fb;
}

.section-inner,
.entry-inner {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.hero-visual {
  display: block;
  width: 100%;
  line-height: 0;
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
}

.hero-action {
  width: min(calc(100% - 40px), 540px);
  margin: 0 auto;
  padding-top: 14px;
}

.cta {
  display: flex;
  width: min(100%, 540px);
  min-height: 58px;
  padding: 14px 18px;
  align-items: center;
  justify-content: center;
  color: var(--white);
  background: var(--blue);
  border: 0;
  border-radius: 4px;
  box-shadow: 0 7px 18px rgba(11, 103, 178, 0.24);
  font: inherit;
  font-size: 16px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
  transition: background 160ms ease, transform 160ms ease;
}

.cta::after {
  content: "→";
  margin-left: 10px;
}

.cta:hover {
  background: #075997;
  transform: translateY(-1px);
}

.section {
  padding: 64px 0;
}

.section-label {
  margin-bottom: 9px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.section h2,
.entry h2 {
  margin-bottom: 28px;
  color: var(--navy);
  font-size: clamp(27px, 7vw, 42px);
  line-height: 1.45;
  letter-spacing: -0.025em;
}

.problems {
  background: var(--blue-pale);
}

.problem-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.problem-list li {
  position: relative;
  padding: 17px 16px 17px 48px;
  background: var(--white);
  border: 1px solid #d8e8f3;
  border-radius: 5px;
  box-shadow: 0 5px 15px rgba(17, 62, 96, 0.045);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.7;
}

.problem-list li::before {
  content: "";
  position: absolute;
  top: 22px;
  left: 19px;
  width: 14px;
  height: 7px;
  border-bottom: 3px solid var(--blue);
  border-left: 3px solid var(--blue);
  transform: rotate(-45deg);
}

.learn {
  background: var(--white);
}

.section-lead {
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 15px;
}

.learn-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-list li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 13px;
  padding: 18px 16px;
  background: #f8fbfd;
  border-left: 3px solid var(--blue);
}

.learn-list span {
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.learn-list p {
  margin-bottom: 0;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.7;
}

.details {
  background: #f6f9fb;
  border-block: 1px solid var(--line);
}

.details-list {
  margin-bottom: 0;
  background: var(--white);
  border-top: 3px solid var(--navy);
}

.details-list > div {
  display: grid;
  grid-template-columns: 74px 1fr;
  border-bottom: 1px solid var(--line);
}

.details-list dt,
.details-list dd {
  padding: 17px 13px;
}

.details-list dt {
  color: var(--navy);
  background: #edf4f9;
  font-size: 12px;
  font-weight: 800;
}

.details-list dd {
  margin-bottom: 0;
  font-size: 14px;
  font-weight: 600;
}

.details-list dd strong {
  color: var(--blue);
}

.details-list small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.7;
}

.entry {
  padding: 62px 0 70px;
  color: var(--white);
  background: var(--navy);
  text-align: center;
}

.entry-label {
  margin-bottom: 8px;
  color: #98caef;
  font-size: 13px;
  font-weight: 800;
}

.entry h2 {
  margin-bottom: 7px;
  color: var(--white);
}

.entry p:not(.entry-label) {
  margin-bottom: 22px;
  color: #cbd9e6;
  font-size: 13px;
}

.entry .cta {
  margin-inline: auto;
}

.cta-disabled,
.cta-disabled:hover {
  color: #6e7f91;
  background: #dce4eb;
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

footer {
  padding: 26px 20px;
  color: #6e7d8d;
  background: #071f3b;
  text-align: center;
  font-size: 11px;
}

footer p {
  margin-bottom: 2px;
}

@media (min-width: 720px) {
  .hero {
    padding-bottom: 38px;
  }

  .section {
    padding: 92px 0;
  }

  .section-inner {
    display: grid;
    grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
    column-gap: 78px;
  }

  .section-label,
  .section h2 {
    grid-column: 1;
  }

  .section h2 {
    margin-bottom: 0;
  }

  .problem-list,
  .learn-content,
  .details-list {
    grid-column: 2;
    grid-row: 1 / span 3;
  }

  .details-list > div {
    grid-template-columns: 110px 1fr;
  }

  .details-list dt,
  .details-list dd {
    padding: 19px 20px;
  }
}

@media (max-width: 374px) {
  .section-inner,
  .entry-inner {
    width: min(calc(100% - 28px), var(--max));
  }

  .hero-action {
    width: min(calc(100% - 28px), 540px);
  }
}