@import url('https://fonts.googleapis.com/css2?family=M+PLUS+Rounded+1c:wght@400;500;700&family=Zen+Maru+Gothic:wght@500;700&display=swap');

:root{
  --lp-pink:#ff7f7f;
  --lp-yellow:#ffff7f;
  --lp-mint:#7fffbf;
  --lp-blue:#7fbfff;
  --lp-peach:#f6b085;
  --lp-ink:#242424;
  --lp-paper:#fffdf8;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.concept-page{
  margin:0;
  color:var(--lp-ink);
  background:var(--lp-paper);
  font-family:"M PLUS Rounded 1c",sans-serif;
  line-height:1.9;
}
body.concept-page a{color:inherit;text-decoration:none}
body.concept-page img{max-width:100%}

.concept-header{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:30px;
  min-height:86px;
  padding:12px 5vw;
  background:rgba(255,253,248,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(0,0,0,.08);
}
.concept-logo{display:flex;align-items:center}
.concept-logo img{display:block;width:180px;height:auto}
.concept-nav{display:flex;gap:24px;align-items:center;font-size:.78rem;font-weight:700;letter-spacing:.08em}
.concept-nav a{position:relative;padding:8px 0}
.concept-nav a::after{
  content:"";
  position:absolute;
  left:0;right:100%;bottom:2px;
  height:3px;border-radius:99px;
  background:linear-gradient(90deg,var(--lp-pink),var(--lp-yellow));
  transition:.25s ease;
}
.concept-nav a:hover::after{right:0}

.concept-hero{
  position:relative;
  min-height:590px;
  display:grid;
  place-items:center;
  overflow:hidden;
  padding:110px 24px 90px;
  background:
    radial-gradient(circle at 15% 20%,rgba(255,127,127,.14),transparent 23%),
    radial-gradient(circle at 85% 30%,rgba(127,255,191,.18),transparent 24%),
    #fffdf8;
}
.concept-hero-inner{
  position:relative;
  z-index:2;
  max-width:920px;
  text-align:center;
}
.concept-eyebrow,.concept-kicker{
  margin:0 0 18px;
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.24em;
}
.concept-eyebrow{color:#d66a6a}
.concept-hero h1,.concept-section h2,.concept-cta h2{
  margin:0;
  font-family:"Zen Maru Gothic",sans-serif;
  font-weight:700;
  letter-spacing:.03em;
}
.concept-hero h1{
  font-size:clamp(2.35rem,5.8vw,5.4rem);
  line-height:1.35;
}
.concept-hero-lead{
  max-width:700px;
  margin:34px auto 0;
  font-size:1.05rem;
}
.concept-hero-orb{
  position:absolute;
  border-radius:50%;
  opacity:.9;
  filter:saturate(.95);
  animation:conceptFloat 7s ease-in-out infinite;
}
.orb-pink{width:150px;height:150px;background:var(--lp-pink);left:7%;top:16%}
.orb-yellow{width:105px;height:105px;background:var(--lp-yellow);right:10%;top:18%;animation-delay:-1.5s}
.orb-mint{width:190px;height:190px;background:var(--lp-mint);right:-30px;bottom:5%;animation-delay:-3s}
.orb-blue{width:92px;height:92px;background:var(--lp-blue);left:13%;bottom:11%;animation-delay:-4.5s}
@keyframes conceptFloat{
  0%,100%{transform:translateY(0) rotate(0)}
  50%{transform:translateY(-18px) rotate(6deg)}
}

.concept-section{padding:110px 24px}
.concept-section-inner{max-width:1160px;margin:0 auto}
.concept-section-inner.narrow{max-width:840px}
.concept-section-inner.center{text-align:center}
.concept-number{
  display:inline-flex;
  width:54px;height:54px;
  align-items:center;justify-content:center;
  margin-bottom:16px;
  border:2px solid var(--lp-ink);
  border-radius:50%;
  font-weight:700;
}
.concept-section h2{
  font-size:clamp(2rem,4.2vw,3.8rem);
  line-height:1.45;
}
.concept-copy{
  margin:28px 0 0;
  font-size:1.02rem;
}

.concept-intro{background:#fff}
.concept-story{background:#fff7f2}
.concept-story-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.concept-card{
  min-height:420px;
  padding:38px 32px;
  border:2px solid #222;
  border-radius:28px;
  box-shadow:7px 7px 0 #222;
}
.concept-card.pink{background:#ffd5d5}
.concept-card.yellow{background:#fffebf}
.concept-card.mint{background:#caffdf}
.concept-card-icon{
  display:inline-grid;
  place-items:center;
  width:54px;height:54px;
  margin-bottom:20px;
  border:2px solid #222;
  border-radius:50%;
  background:#fff;
  font-size:1.5rem;
  font-weight:700;
}
.concept-card-en{
  margin:0 0 14px;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.15em;
}
.concept-card h3{
  margin:0 0 18px;
  font-family:"Zen Maru Gothic",sans-serif;
  font-size:1.6rem;
  line-height:1.5;
}
.concept-card p:last-child{margin:0;font-size:.95rem}

.concept-message{background:#fff}
.message-grid{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);
  gap:70px;
  align-items:center;
}
.message-art{
  position:relative;
  min-height:430px;
  border-radius:34px;
  background:#f8f8ff;
  overflow:hidden;
}
.art-circle{position:absolute;border-radius:50%;border:3px solid #222}
.art-circle.c1{width:260px;height:260px;background:var(--lp-pink);left:9%;top:18%}
.art-circle.c2{width:180px;height:180px;background:var(--lp-yellow);right:5%;top:7%}
.art-circle.c3{width:210px;height:210px;background:var(--lp-mint);right:10%;bottom:-5%}
.art-star,.art-heart{
  position:absolute;
  z-index:2;
  font-size:4rem;
  font-family:"Zen Maru Gothic",sans-serif;
}
.art-star{left:58%;top:43%;transform:rotate(10deg)}
.art-heart{left:20%;bottom:8%;font-size:5rem}

.concept-rental{background:#effaff}
.concept-flow{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:18px;
  flex-wrap:wrap;
  margin-top:48px;
}
.concept-flow div{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  width:110px;height:110px;
  border:2px solid #222;
  border-radius:50%;
  background:#fff;
}
.concept-flow b{font-size:1.5rem;line-height:1}
.concept-flow span{margin-top:7px;font-weight:700}
.concept-flow i{font-style:normal;font-size:1.5rem}

.concept-cta{
  padding:105px 24px;
  background:linear-gradient(135deg,#ffd8d8 0 25%,#fffdb7 25% 50%,#c8ffe0 50% 75%,#d6e9ff 75%);
}
.concept-cta-inner{
  max-width:900px;
  margin:0 auto;
  padding:62px 40px;
  text-align:center;
  background:rgba(255,255,255,.9);
  border:2px solid #222;
  border-radius:34px;
  box-shadow:8px 8px 0 #222;
}
.concept-cta p{margin:0 0 8px;font-weight:700}
.concept-cta h2{font-size:clamp(1.8rem,4vw,3.2rem)}
.concept-cta-buttons{
  display:flex;
  justify-content:center;
  gap:16px;
  flex-wrap:wrap;
  margin-top:34px;
}
.concept-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
  padding:0 24px;
  border:2px solid #222;
  border-radius:999px;
  font-weight:700;
  transition:.2s ease;
}
.concept-btn.primary{background:#222;color:#fff}
.concept-btn.secondary{background:#fff}
.concept-btn:hover{transform:translateY(-2px)}

.concept-footer{
  padding:46px 24px;
  text-align:center;
  background:#fffdf8;
}
.concept-footer-logo img{width:165px}
.concept-footer p{
  margin:8px 0 0;
  font-size:.72rem;
  letter-spacing:.12em;
  font-weight:700;
}

@media (max-width:900px){
  .concept-header{align-items:flex-start;flex-direction:column;gap:8px;padding:12px 22px}
  .concept-nav{width:100%;overflow-x:auto;gap:18px;padding-bottom:4px;white-space:nowrap}
  .concept-logo img{width:155px}
  .concept-story-grid{grid-template-columns:1fr}
  .concept-card{min-height:auto}
  .message-grid{grid-template-columns:1fr;gap:40px}
  .message-art{min-height:360px}
}

@media (max-width:600px){
  .concept-header{position:relative}
  .concept-hero{min-height:520px;padding:80px 20px 70px}
  .concept-hero h1{font-size:2.35rem}
  .concept-hero-lead{font-size:.95rem}
  .concept-section{padding:78px 20px}
  .concept-section h2{font-size:2rem}
  .concept-copy{font-size:.96rem}
  .concept-card{padding:30px 24px;border-radius:22px;box-shadow:5px 5px 0 #222}
  .concept-card h3{font-size:1.4rem}
  .message-art{min-height:300px}
  .art-circle.c1{width:190px;height:190px}
  .art-circle.c2{width:135px;height:135px}
  .art-circle.c3{width:160px;height:160px}
  .concept-flow{gap:10px}
  .concept-flow div{width:86px;height:86px}
  .concept-flow i{font-size:1rem}
  .concept-cta{padding:72px 18px}
  .concept-cta-inner{padding:42px 20px;border-radius:24px}
  .concept-cta-buttons{flex-direction:column}
  .concept-btn{width:100%}
  .orb-pink{width:95px;height:95px;left:-15px}
  .orb-yellow{width:75px;height:75px;right:-5px}
  .orb-mint{width:120px;height:120px}
  .orb-blue{width:65px;height:65px}
}

/* ===== littlepalette 共通スマートフォンメニュー ===== */

.lp-mobile-menu {
  display: none;
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  background: #fff;
  border: 2px solid #222;
  border-radius: 12px;
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  position: relative;
  z-index: 42;
}

.lp-mobile-menu span {
  display: block;
  width: 100%;
  height: 2px;
  background: #222;
  border-radius: 2px;
  transition: .25s;
}

.lp-mobile-menu.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.lp-mobile-menu.is-open span:nth-child(2) {
  opacity: 0;
}

.lp-mobile-menu.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 760px) {
  .concept-header,
  .sub-header {
    position: sticky;
    top: 0;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    min-height: 74px;
    padding: 10px 18px;
    z-index: 40;
  }

  .lp-mobile-menu {
    display: flex;
  }

  .concept-nav,
  .sub-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    max-width: none;
    max-height: calc(100dvh - 74px);
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px 20px;
    background: #fffdf8;
    border-bottom: 2px solid #eee;
    box-shadow: 0 12px 20px rgba(0,0,0,.08);
    white-space: normal;
  }

  .concept-nav.is-open,
  .sub-nav.is-open {
    display: flex;
  }

  .concept-nav a,
  .sub-nav a {
    display: block;
    padding: 13px 10px;
    border-bottom: 1px solid #eee;
    font-size: 15px;
  }
}