:root {
  color-scheme: light;
  --ink: #3c3735;
  --muted: #6f6865;
  --line: #e7ded4;
  --paper: #fffdf8;
  --cream: #fff8dc;
  --green: #98cf27;
  --green-dark: #73ad15;
  --pink: #ef6f99;
  --pink-dark: #d94f7c;
  --yellow: #ffe15a;
  --blue: #54aee9;
  --shadow: 0 18px 45px rgba(80, 68, 54, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.75;
  background: var(--paper);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 44px);
  min-height: 88px;
  padding: 12px clamp(20px, 5vw, 72px);
  background: rgba(255, 253, 248, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(231, 222, 212, 0.75);
}

.brand img {
  width: 118px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: clamp(18px, 3.2vw, 44px);
  font-size: 0.95rem;
  font-weight: 700;
}

.nav a {
  padding: 10px 0;
}

.header-cta,
.primary-button,
.contact-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 54px;
  border: 0;
  border-radius: 999px;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(180deg, #f486a9, var(--pink));
  box-shadow: 0 8px 16px rgba(217, 79, 124, 0.24);
  cursor: pointer;
}

.header-cta {
  min-height: 48px;
  padding: 0 28px;
  font-size: 0.92rem;
  white-space: nowrap;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 650px;
  background:
    linear-gradient(90deg, rgba(255, 253, 248, 0.98) 0%, rgba(255, 253, 248, 0.92) 43%, rgba(255, 253, 248, 0.1) 66%),
    url("assets/hero-classroom.png?v=2") right 9vw center / min(48vw, 620px) auto no-repeat,
    var(--paper);
}

.hero::after {
  content: "";
  position: absolute;
  right: 9%;
  bottom: 78px;
  width: clamp(150px, 19vw, 210px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff48f 0, var(--yellow) 58%, #f6ce4b 100%);
  box-shadow: var(--shadow);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100% - 40px));
  min-height: inherit;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.hero-copy {
  width: min(510px, 100%);
  padding: 48px 0 72px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 0 14px;
  font-weight: 900;
  font-size: clamp(1.25rem, 2.4vw, 2rem);
  line-height: 1.35;
  background: linear-gradient(transparent 58%, var(--yellow) 58%);
}

h1,
h2,
h3,
p,
dl,
dd {
  margin: 0;
}

h1 {
  font-size: clamp(4.4rem, 9vw, 7.7rem);
  line-height: 1;
  font-weight: 900;
  color: #5b5552;
  text-shadow:
    0 4px 0 #e9e2dd,
    0 8px 12px rgba(71, 62, 56, 0.18);
}

.hero-lead {
  margin-top: 26px;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 700;
}

.target-box {
  width: min(410px, 100%);
  margin: 26px 0 36px;
  padding: 14px 22px 18px;
  border: 2px solid #ded257;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
}

.target-box span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 16px;
  margin: -31px 0 8px -7px;
  border-radius: 999px;
  background: var(--green);
  color: #335500;
  font-weight: 900;
}

.target-box p {
  font-weight: 800;
}

.target-box strong {
  display: block;
  margin-top: 10px;
  font-size: 1rem;
}

.primary-button {
  width: min(400px, 100%);
  padding: 0 30px;
  min-height: 70px;
  font-size: clamp(1.08rem, 2vw, 1.32rem);
}

.primary-button span {
  font-size: 2rem;
  line-height: 1;
}

.campaign {
  position: absolute;
  right: 3%;
  bottom: 78px;
  z-index: 2;
  display: grid;
  place-items: center;
  width: clamp(150px, 19vw, 210px);
  aspect-ratio: 1;
  text-align: center;
  font-weight: 900;
}

.campaign span,
.campaign small {
  font-size: clamp(0.78rem, 1.2vw, 1rem);
}

.campaign strong {
  color: var(--pink);
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.2;
}

.section {
  padding: clamp(54px, 7vw, 86px) 20px;
}

.section-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.section h2 {
  text-align: center;
  font-size: clamp(1.75rem, 3.2vw, 2.55rem);
  line-height: 1.3;
  font-weight: 900;
  margin-bottom: clamp(34px, 5vw, 56px);
}

.section h2 span {
  color: var(--pink);
  font-size: 1.25em;
}

.features {
  background: #fffaf0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.feature {
  position: relative;
  padding: 0 clamp(24px, 4vw, 54px);
  text-align: center;
}

.feature + .feature {
  border-left: 2px dashed #ddd06c;
}

.feature .number,
.flow-list span {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-weight: 900;
}

.feature svg {
  width: 88px;
  height: 88px;
  margin: 18px auto 24px;
  fill: none;
  stroke: #4b4643;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature h3 {
  min-height: 58px;
  display: grid;
  place-items: center;
  font-size: clamp(1.1rem, 1.7vw, 1.28rem);
  line-height: 1.45;
  font-weight: 900;
}

.feature p {
  margin-top: 18px;
  color: var(--muted);
  font-weight: 600;
}

.pricing {
  background: linear-gradient(180deg, #fff9df 0%, #fffef8 100%);
}

.price-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.price-card {
  min-height: 300px;
  padding: clamp(26px, 4vw, 40px);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 5px 22px rgba(80, 68, 54, 0.08);
}

.price-card.green {
  border: 2px solid #d1c942;
}

.price-card.blue {
  border: 2px solid #7cc4ef;
}

.price-card h3 {
  margin-bottom: 24px;
  text-align: center;
  font-size: clamp(1.22rem, 2vw, 1.55rem);
  color: var(--green-dark);
}

.price-card.blue h3 {
  color: #3197da;
}

.price-card dl {
  display: grid;
  gap: 10px;
  margin-bottom: 26px;
}

.price-card dl div {
  display: flex;
  align-items: center;
  gap: 22px;
}

.price-card dt {
  min-width: 76px;
  padding: 4px 16px;
  border-radius: 999px;
  color: #fff;
  background: var(--green);
  font-weight: 900;
  text-align: center;
}

.price-card.blue dt {
  background: var(--blue);
}

.price-card dd {
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  font-weight: 900;
}

.price-card p,
.note {
  color: var(--muted);
  font-weight: 600;
}

.note {
  margin-top: 24px;
  text-align: center;
  font-size: 0.92rem;
}

.flow {
  background: #fff;
}

.flow-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 330px);
  align-items: center;
  gap: clamp(28px, 5vw, 58px);
}

.flow-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.flow-list li {
  position: relative;
  min-height: 190px;
  padding: 24px 16px;
  text-align: center;
  border-radius: 50%;
  background: #fbfaec;
}

.flow-list strong {
  display: block;
  margin: 8px 0;
  font-weight: 900;
}

.flow-list p {
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--muted);
  font-weight: 600;
}

.flow-photo {
  width: 100%;
  border-radius: 0;
}

.faq-contact {
  padding-top: 20px;
  background: #fff;
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
  gap: clamp(34px, 6vw, 76px);
  align-items: start;
}

.faq-block h2,
.contact-panel h2 {
  text-align: left;
  margin-bottom: 22px;
}

details {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}

summary {
  cursor: pointer;
  font-weight: 900;
  list-style: none;
}

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

summary::before {
  content: "Q";
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-right: 12px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-weight: 900;
}

details p {
  margin: 10px 0 0 42px;
  color: var(--muted);
  font-weight: 600;
}

.contact-panel {
  padding: clamp(24px, 4vw, 34px);
  border: 2px solid #bdd64a;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(80, 68, 54, 0.08);
}

.contact-panel > p {
  font-size: 1.08rem;
  font-weight: 800;
  margin-bottom: 22px;
}

.contact-form {
  display: grid;
  gap: 14px;
}

.contact-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 800;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  font: inherit;
  background: #fffdf8;
}

.contact-form textarea {
  resize: vertical;
}

.contact-form button {
  min-height: 58px;
  margin-top: 4px;
  font-size: 1rem;
}

.site-footer {
  color: #fff;
  background: linear-gradient(90deg, #ee83a8 0%, #e95f8e 100%);
}

.footer-inner {
  width: min(1120px, calc(100% - 40px));
  min-height: 150px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 130px 1fr 1fr 96px;
  gap: 28px;
  align-items: center;
}

.footer-inner > img:first-child {
  width: 118px;
  filter: brightness(0) invert(1);
}

.footer-inner p {
  font-weight: 800;
}

.footer-inner a {
  display: block;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1.2;
  font-weight: 900;
}

.footer-inner small {
  display: block;
  margin-top: 4px;
  font-weight: 700;
}

address {
  font-style: normal;
  font-weight: 800;
}

.qr {
  width: 92px;
  border-radius: 8px;
  background: #fff;
  padding: 5px;
}

@media (max-width: 980px) {
  .site-header {
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .nav {
    order: 3;
    flex-basis: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero {
    min-height: auto;
    background:
      linear-gradient(180deg, rgba(255, 253, 248, 0.96) 0%, rgba(255, 253, 248, 0.88) 54%, rgba(255, 253, 248, 0.22) 100%),
      url("assets/hero-classroom.png?v=2") center bottom / min(92vw, 560px) auto no-repeat,
      var(--paper);
  }

  .hero-inner {
    min-height: 760px;
    align-items: flex-start;
  }

  .hero-copy {
    padding-top: 34px;
  }

  .campaign {
    right: 20px;
    bottom: 64px;
  }

  .hero::after {
    right: 20px;
    bottom: 64px;
  }

  .feature-grid,
  .price-grid,
  .flow-inner,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .feature {
    padding: 28px 10px;
  }

  .feature + .feature {
    border-left: 0;
    border-top: 2px dashed #ddd06c;
  }

  .flow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-photo {
    width: min(360px, 100%);
    margin: 0 auto;
  }

  .footer-inner {
    grid-template-columns: 110px 1fr;
    padding: 28px 0;
  }
}

@media (max-width: 620px) {
  .site-header {
    position: relative;
    min-height: auto;
    padding: 12px 16px 16px;
  }

  .brand img {
    width: 92px;
  }

  .header-cta {
    min-height: 42px;
    padding: 0 18px;
    font-size: 0.84rem;
  }

  .nav {
    gap: 18px;
    font-size: 0.84rem;
  }

  .hero-inner {
    width: calc(100% - 32px);
    min-height: 720px;
  }

  h1 {
    font-size: clamp(3.5rem, 18vw, 5rem);
  }

  .primary-button {
    min-height: 62px;
  }

  .campaign {
    width: 138px;
    right: 14px;
    bottom: 58px;
  }

  .hero::after {
    width: 138px;
    right: 14px;
    bottom: 58px;
  }

  .flow-list {
    grid-template-columns: 1fr;
  }

  .flow-list li {
    min-height: auto;
    border-radius: 8px;
  }

  .price-card dl div {
    gap: 14px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-inner > img:first-child,
  .qr {
    margin: 0 auto;
  }
}