:root {
  color-scheme: light;
  --ocean-900: #073f47;
  --ocean-800: #075d66;
  --ocean-700: #087b83;
  --ocean-500: #11a8ad;
  --ocean-100: #dff7f4;
  --ocean-50: #f2fbfa;
  --sand: #fff9ec;
  --coral: #f37b61;
  --ink: #12363b;
  --muted: #557177;
  --line: #cce6e3;
  --white: #ffffff;
  --shadow: 0 18px 55px rgba(7, 93, 102, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family:
    -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Meiryo",
    sans-serif;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

a {
  color: var(--ocean-700);
  text-underline-offset: 0.2em;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 4px;
  border-radius: 4px;
}

.site-header {
  min-height: 76px;
  padding: 14px clamp(20px, 5vw, 72px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.25;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  background: var(--ocean-100);
  border-radius: 50%;
  font-size: 25px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 15px;
}

.brand small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

nav a {
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--ocean-700);
}

.hero {
  min-height: 570px;
  padding: 70px clamp(24px, 8vw, 120px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.85fr);
  align-items: center;
  gap: clamp(40px, 8vw, 120px);
  background:
    radial-gradient(circle at 78% 15%, rgba(255, 255, 255, 0.68), transparent 20%),
    linear-gradient(135deg, var(--sand) 0 48%, var(--ocean-100) 48% 100%);
}

.hero-copy {
  max-width: 660px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--ocean-700);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.18;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 30px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.35;
  letter-spacing: -0.025em;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  line-height: 1.45;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 580px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: 17px;
}

.primary-button,
.inline-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 24px;
  color: var(--white);
  background: var(--ocean-700);
  border-radius: 999px;
  box-shadow: 0 10px 24px rgba(8, 123, 131, 0.22);
  font-weight: 800;
  text-decoration: none;
  transition:
    transform 160ms ease,
    background 160ms ease;
}

.primary-button:hover,
.inline-button:hover {
  background: var(--ocean-800);
  transform: translateY(-2px);
}

.hero-scene {
  position: relative;
  min-height: 360px;
  overflow: hidden;
  background: linear-gradient(180deg, #5fd3d3, #138b9b);
  border: 9px solid rgba(255, 255, 255, 0.76);
  border-radius: 48% 52% 48% 52% / 55% 45% 55% 45%;
  box-shadow: var(--shadow);
}

.fish {
  position: absolute;
  filter: drop-shadow(0 8px 8px rgba(7, 63, 71, 0.16));
}

.fish-one {
  top: 30%;
  left: 20%;
  font-size: 82px;
  transform: rotate(-8deg);
}

.fish-two {
  right: 17%;
  bottom: 22%;
  font-size: 58px;
  transform: scaleX(-1) rotate(7deg);
}

.bubble {
  position: absolute;
  border: 3px solid rgba(255, 255, 255, 0.62);
  border-radius: 50%;
}

.bubble-one {
  top: 16%;
  right: 23%;
  width: 38px;
  height: 38px;
}

.bubble-two {
  top: 28%;
  right: 13%;
  width: 18px;
  height: 18px;
}

.wave {
  position: absolute;
  right: -10%;
  bottom: -30%;
  left: -10%;
  height: 48%;
  background: rgba(7, 63, 71, 0.16);
  border-radius: 50% 50% 0 0;
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 92px clamp(24px, 5vw, 64px);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 24px;
}

.feature-card > span {
  display: block;
  margin-bottom: 16px;
  font-size: 34px;
}

.feature-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.section-tint {
  max-width: none;
  padding-right: max(24px, calc((100vw - 1052px) / 2));
  padding-left: max(24px, calc((100vw - 1052px) / 2));
  background: var(--ocean-50);
}

.faq-list {
  display: grid;
  gap: 14px;
}

details {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(7, 93, 102, 0.05);
}

summary {
  padding: 20px 58px 20px 22px;
  position: relative;
  cursor: pointer;
  list-style: none;
  font-weight: 800;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 22px;
  color: var(--ocean-700);
  font-size: 28px;
  font-weight: 400;
  transform: translateY(-52%);
}

details[open] summary::after {
  content: "−";
}

details > div {
  padding: 0 22px 20px;
  color: var(--muted);
}

details > div p:last-child {
  margin-bottom: 0;
}

.contact-section {
  margin-top: 70px;
  margin-bottom: 70px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 48px;
  background: var(--ocean-900);
  color: var(--white);
  border-radius: 34px;
  box-shadow: var(--shadow);
}

.contact-section .eyebrow {
  color: #7ce7e0;
}

.contact-section h2 {
  margin-bottom: 14px;
}

.contact-section p {
  max-width: 720px;
  color: #d4eeee;
}

.contact-section .notice {
  margin-bottom: 0;
  padding: 12px 16px;
  color: #ffe9cf;
  background: rgba(255, 255, 255, 0.08);
  border-left: 4px solid #ffc673;
  border-radius: 6px;
  font-size: 14px;
}

.external-button {
  flex-shrink: 0;
  background: var(--coral);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
}

.external-button:hover {
  background: #dd654e;
}

.policy-main {
  min-height: calc(100vh - 170px);
  padding: 70px 24px 100px;
  background: linear-gradient(180deg, var(--ocean-50), var(--white) 420px);
}

.policy-heading,
.policy-card {
  max-width: 860px;
  margin-right: auto;
  margin-left: auto;
}

.policy-heading {
  margin-bottom: 30px;
}

.policy-heading h1 {
  margin-bottom: 10px;
  font-size: clamp(36px, 6vw, 58px);
}

.policy-heading > p:last-child {
  color: var(--muted);
}

.policy-card {
  padding: clamp(28px, 6vw, 64px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.policy-card h2 {
  margin-top: 50px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 25px;
}

.policy-card h2:first-of-type {
  margin-top: 38px;
}

.policy-card h3 {
  margin-top: 28px;
  color: var(--ocean-800);
}

.policy-card p,
.policy-card li {
  color: #365c62;
}

.policy-card li + li {
  margin-top: 7px;
}

.inline-button {
  min-height: 46px;
  margin-top: 8px;
  padding: 9px 20px;
  font-size: 14px;
}

footer {
  min-height: 88px;
  padding: 24px clamp(24px, 5vw, 72px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  background: var(--ocean-50);
  border-top: 1px solid var(--line);
  font-size: 13px;
}

footer p {
  margin-bottom: 0;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    width: 100%;
    gap: 16px;
    overflow-x: auto;
    padding-bottom: 3px;
  }

  nav a {
    flex-shrink: 0;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: 54px;
  }

  .hero-scene {
    min-height: 300px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .contact-section {
    margin-right: 18px;
    margin-left: 18px;
    grid-template-columns: 1fr;
  }

  .external-button {
    width: 100%;
    white-space: normal;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .brand strong {
    font-size: 14px;
  }

  .hero {
    padding-right: 20px;
    padding-left: 20px;
    background: linear-gradient(160deg, var(--sand), var(--ocean-100));
  }

  h1 {
    font-size: 40px;
  }

  .hero-scene {
    min-height: 250px;
  }

  .fish-one {
    font-size: 64px;
  }

  .fish-two {
    font-size: 46px;
  }

  .section {
    padding-top: 70px;
    padding-bottom: 70px;
  }

  .contact-section {
    padding: 40px 24px;
    border-radius: 26px;
  }

  .policy-main {
    padding-right: 16px;
    padding-left: 16px;
  }

  .policy-card {
    padding: 26px 20px;
    border-radius: 20px;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .primary-button,
  .inline-button {
    transition: none;
  }
}