/* ================================================
   three flats - Main Stylesheet
   ================================================ */

/* ---------- RESET & BASE ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#0a0a0a;
  --fg:#f5f5f5;
  --muted:#888888;
  --muted-fg:#666666;
  --border:#222222;
  --card:#111111;
  --secondary:#1a1a1a;
  --font-body:'Noto Sans JP',sans-serif;
  --font-display:'Chillax','Noto Sans JP',sans-serif;
  --ease-out-expo:cubic-bezier(0.16,1,0.3,1);
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--fg);
  line-height:1.6;
  font-weight:300;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}
input,textarea{font:inherit;color:inherit}

/* Utility */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.container--narrow{max-width:800px;margin:0 auto;padding:0 24px}
.sp-only{display:none}

@media(max-width:767px){
  .container{padding:0 20px}
  .container--narrow{padding:0 20px}
  .sp-only{display:inline}
}

/* ---------- SPLASH ---------- */
.splash{
  position:fixed;inset:0;z-index:9999;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg);
  transition:opacity .6s ease;
}
.splash.is-exit{opacity:0;pointer-events:none}
.splash.is-done{display:none}
.splash__inner{text-align:center}
.splash__logo{
  width:160px;height:auto;
  filter:invert(1) brightness(2);
  animation:splashLogoIn .7s var(--ease-out-expo) both;
}
@keyframes splashLogoIn{
  from{opacity:0;transform:scale(.92)}
  to{opacity:1;transform:scale(1)}
}

@media(min-width:768px){
  .splash__logo{width:200px}
}

/* ---------- HEADER ---------- */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .5s,backdrop-filter .5s;
}
.header.is-scrolled{
  background:rgba(10,10,10,.8);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.header__inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 24px;
}
.header__logo{display:block;width:100px}
.header__logo img{
  width:100%;height:auto;
  filter:invert(1) brightness(2);
}
.header__nav{display:none}
.header__nav-list{display:flex;gap:32px}
.header__nav-list a{
  font-family:var(--font-display);
  font-size:11px;letter-spacing:.15em;
  color:var(--fg);
  transition:color .3s;
}
.header__nav-list a:hover{color:var(--fg)}

/* Nav hover text effect */
.nav-hover-text{
  position:relative;overflow:hidden;
  display:inline-flex;flex-direction:column;
  height:1.2em;
}
.nav-hover-text span{transition:transform .4s var(--ease-out-expo)}
.nav-hover-text:hover span:first-child{transform:translateY(-100%)}
.nav-hover-text:hover span:last-child{transform:translateY(-100%)}
.nav-hover-text span:last-child{
  position:absolute;top:100%;
  background:linear-gradient(135deg,#c0a0ff,#80c0ff,#a0e0c0);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}

/* Hamburger */
.header__hamburger{
  position:relative;z-index:110;
  width:32px;height:32px;
  display:flex;align-items:center;justify-content:center;
}
.header__hamburger .hamburger-line{
  display:block;width:24px;height:1px;
  background:var(--fg);
  position:absolute;
  transition:transform .4s var(--ease-out-expo),opacity .3s;
}
.header__hamburger .hamburger-line:first-child{transform:translateY(-4px)}
.header__hamburger .hamburger-line:last-child{transform:translateY(4px)}
.header__hamburger.is-open .hamburger-line:first-child{transform:rotate(45deg)}
.header__hamburger.is-open .hamburger-line:last-child{transform:rotate(-45deg)}

@media(min-width:768px){
  .header__inner{padding:20px 48px}
  .header__logo{width:120px}
  .header__nav{display:block}
  .header__hamburger{display:none}
}

/* ---------- MOBILE MENU ---------- */
.mobile-menu{
  position:fixed;inset:0;z-index:105;
  background:var(--bg);
  display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;
  transition:opacity .5s;
}
.mobile-menu.is-open{opacity:1;pointer-events:auto}
.mobile-menu__list{text-align:center}
.mobile-menu__list li{overflow:hidden}
.mobile-menu__list a{
  display:inline-block;
  font-family:var(--font-display);
  font-size:1.5rem;letter-spacing:.2em;
  font-weight:300;color:var(--fg);
  padding:12px 0;
  transform:translateY(30px);opacity:0;
  transition:all .5s var(--ease-out-expo);
}
.mobile-menu.is-open .mobile-menu__list a{
  transform:translateY(0);opacity:1;
}
.mobile-menu__list li:nth-child(1) a{transition-delay:.1s}
.mobile-menu__list li:nth-child(2) a{transition-delay:.16s}
.mobile-menu__list li:nth-child(3) a{transition-delay:.22s}
.mobile-menu__list li:nth-child(4) a{transition-delay:.28s}
.mobile-menu__list li:nth-child(5) a{transition-delay:.34s}

/* ---------- HERO ---------- */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:center;
  overflow:hidden;
}
.hero__bg{position:absolute;inset:0;z-index:0}
.hero__bg-img{
  position:absolute;inset:0;
  background-size:cover;background-position:center;
  opacity:0;transition:opacity 1.5s;
}
.hero__bg-img::after{
  content:'';position:absolute;inset:0;
  background:rgba(10,10,10,.75);
}
.hero__bg-img.is-active{opacity:1}
.hero__content{
  position:relative;z-index:1;
  width:100%;padding:120px 20px 80px;
  max-width:1200px;margin:0 auto;
}
.hero__title{
  font-family:var(--font-display);
  font-size:clamp(1.8rem,5vw,4.5rem);
  font-weight:300;line-height:1.15;
  letter-spacing:-.02em;color:var(--fg);
}
.hero__subtitle{
  margin-top:32px;
  font-size:14px;font-weight:300;
  color:var(--muted);letter-spacing:.2em;
  line-height:1.6;
}
.hero__images{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:12px;margin-top:64px;max-width:700px;
}
.hero__image-box{
  position:relative;aspect-ratio:3/4;overflow:hidden;
}
.hero__image-box img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 6s ease;
}
.hero__image-box.is-active img{transform:scale(1.08)}

/* Scroll indicator */
.hero__scroll{
  position:absolute;bottom:32px;left:50%;
  transform:translateX(-50%);z-index:1;
  display:flex;flex-direction:column;align-items:center;gap:12px;
}
.hero__scroll span{
  font-family:var(--font-display);
  font-size:10px;letter-spacing:.3em;
  color:var(--muted);text-transform:uppercase;
}
.hero__scroll-line{
  width:1px;height:40px;
  background:rgba(136,136,136,.3);
  position:relative;overflow:hidden;
}
.hero__scroll-line-inner{
  position:absolute;top:0;left:0;width:100%;height:100%;
  background:rgba(245,245,245,.6);
  animation:scrollIndicator 2s ease-in-out infinite;
}
@keyframes scrollIndicator{
  0%{transform:translateY(-100%)}
  50%{transform:translateY(0)}
  100%{transform:translateY(100%)}
}

/* Reveal animation helper */
.reveal-up{
  opacity:0;transform:translateY(30px);
  transition:opacity .9s var(--ease-out-expo),transform .9s var(--ease-out-expo);
}
.reveal-up.is-visible{opacity:1;transform:translateY(0)}

@media(min-width:768px){
  .hero__content{padding:120px 48px 80px}
  .hero__subtitle{margin-top:48px;font-size:15px}
  .hero__images{gap:20px;margin-top:96px}
}

/* ---------- SECTION COMMON ---------- */
.section-label{
  font-family:var(--font-display);
  font-size:11px;letter-spacing:.3em;
  color:var(--muted);text-transform:uppercase;
  margin-bottom:48px;
}
.section-heading{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,3vw,1.875rem);
  font-weight:300;color:var(--fg);
  line-height:1.6;margin-bottom:80px;
}

@media(min-width:768px){
  .section-heading{margin-bottom:112px}
}

/* Scroll reveal */
.scroll-reveal{
  opacity:0;transform:translateY(40px);
  transition:opacity .8s var(--ease-out-expo),transform .8s var(--ease-out-expo);
}
.scroll-reveal.is-visible{opacity:1;transform:translateY(0)}

/* ---------- CONCEPT (ABOUT) ---------- */
.concept{padding:128px 0;overflow:hidden}
.concept__heading{
  font-family:var(--font-display);
  font-size:clamp(2.5rem,8vw,8rem);
  font-weight:500;line-height:1.05;
  letter-spacing:-.02em;
  margin-bottom:64px;
  background:linear-gradient(135deg,#c0a0ff 0%,#80c0ff 50%,#a0e0c0 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.concept__body{max-width:600px;margin-left:auto}
.concept__body-title{
  font-size:clamp(1rem,2vw,1.25rem);
  font-weight:500;margin-bottom:24px;
  color:var(--fg);line-height:1.6;
}
.concept__body-text{
  font-size:14px;color:var(--muted);
  line-height:2;font-weight:300;
}

@media(min-width:768px){
  .concept{padding:192px 0}
  .concept__heading{margin-bottom:96px}
  .concept__body-text{font-size:15px}
}

/* ---------- TICKER ---------- */
.ticker-wrap{margin-top:96px;overflow:hidden}
.ticker{
  display:flex;width:max-content;
  font-family:var(--font-display);
  font-size:clamp(2.5rem,6vw,5rem);
  font-weight:300;
  color:rgba(245,245,245,.5);
  letter-spacing:.05em;
  white-space:nowrap;
  user-select:none;
}
.ticker span{display:inline-block;white-space:nowrap}
.ticker--left{animation:tickerLeft 30s linear infinite}
.ticker--right{animation:tickerRight 30s linear infinite}
.ticker--fast{animation-duration:22s}
@keyframes tickerLeft{
  0%{transform:translateX(0)}
  100%{transform:translateX(-50%)}
}
@keyframes tickerRight{
  0%{transform:translateX(-50%)}
  100%{transform:translateX(0)}
}

@media(min-width:768px){
  .ticker-wrap{margin-top:128px}
}

/* ---------- SERVICE ---------- */
.service{padding:128px 0}
.service__list{display:flex;flex-direction:column;gap:128px}
.service__item{
  display:flex;flex-direction:column;gap:48px;
  align-items:flex-start;
}
.service__item--reverse{flex-direction:column}
.service__item-image{
  width:100%;position:relative;
  aspect-ratio:4/3;overflow:hidden;
}
.service__item-image img{width:100%;height:100%;object-fit:cover}
.service__item-text{width:100%}
.service__item-num{
  font-family:var(--font-display);
  font-size:11px;letter-spacing:.3em;
  color:var(--muted);margin-bottom:16px;
}
.service__item-title{
  font-size:clamp(1.125rem,2.5vw,1.5rem);
  font-weight:500;color:var(--fg);
  margin-bottom:24px;line-height:1.6;
}
.service__item-desc{
  font-size:14px;color:var(--muted);
  line-height:2;font-weight:300;
}

@media(min-width:768px){
  .service{padding:192px 0}
  .service__list{gap:192px}
  .service__item{flex-direction:row;gap:64px}
  .service__item--reverse{flex-direction:row-reverse}
  .service__item-image{width:50%}
  .service__item-text{width:50%;padding-top:32px}
  .service__item-desc{font-size:15px}
}

/* ---------- MISSION ---------- */
.mission{padding:128px 0;overflow:hidden}
.mission__lead{
  font-size:14px;color:var(--muted);
  font-weight:300;line-height:1.6;
  margin-top:-64px;margin-bottom:80px;
  max-width:600px;
}
.mission__grid{
  display:grid;grid-template-columns:1fr;gap:48px;
}
.mission__card-num{
  font-family:var(--font-display);
  font-size:clamp(2rem,4vw,3rem);
  font-weight:300;color:rgba(245,245,245,.08);
  display:block;margin-bottom:24px;
}
.mission__card-title{
  font-size:clamp(1rem,2vw,1.25rem);
  font-weight:500;color:var(--fg);
  margin-bottom:24px;line-height:1.6;
}
.mission__card-list li{
  font-size:13px;color:var(--muted);
  line-height:1.8;font-weight:300;
  display:flex;align-items:flex-start;gap:12px;
  margin-bottom:12px;
}
.mission__card-list li::before{
  content:'';
  width:4px;height:4px;border-radius:50%;
  background:rgba(136,136,136,.5);
  margin-top:8px;flex-shrink:0;
}

@media(min-width:768px){
  .mission{padding:192px 0}
  .mission__lead{margin-top:-96px;margin-bottom:112px;font-size:15px}
  .mission__grid{grid-template-columns:repeat(3,1fr);gap:32px}
}

/* ---------- BUSINESS ---------- */
.business{padding:128px 0}
.business__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:1px;
  background:rgba(34,34,34,.3);
}
.business__card{
  background:var(--bg);
  padding:32px;
  display:flex;flex-direction:column;
  transition:background .5s;
}
.business__card:hover{background:rgba(26,26,26,.5)}
.business__card-icon{
  width:24px;height:24px;
  color:var(--muted);margin-bottom:32px;
  transition:color .5s;
}
.business__card:hover .business__card-icon{color:var(--fg)}
.business__card-title{
  font-size:15px;font-weight:500;
  color:var(--fg);margin-bottom:12px;
  line-height:1.6;
}
.business__card-desc{
  font-size:12px;color:var(--muted);
  line-height:1.8;font-weight:300;
  margin-top:auto;
}

@media(min-width:640px){
  .business__grid{grid-template-columns:repeat(2,1fr)}
}
@media(min-width:768px){
  .business{padding:192px 0}
  .business__card{padding:40px}
}
@media(min-width:1024px){
  .business__grid{grid-template-columns:repeat(4,1fr)}
}

/* ---------- IMAGE SLIDER ---------- */
.image-slider{overflow:hidden;padding:32px 0}
.image-slider__track{
  display:flex;gap:16px;width:max-content;
  animation:tickerLeft 40s linear infinite;
}
.image-slider__item{
  width:280px;aspect-ratio:16/10;
  overflow:hidden;flex-shrink:0;
}
.image-slider__item img{width:100%;height:100%;object-fit:cover}

@media(min-width:768px){
  .image-slider__item{width:360px}
}

/* ---------- COMPANY ---------- */
.company{padding:128px 0}
.company__list{display:flex;flex-direction:column}
.company__row{
  position:relative;
  display:flex;flex-direction:column;gap:8px;
  padding:24px 0;
}
.company__row dt{
  font-size:12px;letter-spacing:.1em;
  color:var(--muted);flex-shrink:0;
}
.company__row dd{
  font-size:14px;color:var(--fg);
  font-weight:300;line-height:1.8;
}
.company__row-border{
  position:absolute;bottom:0;left:0;right:0;
  height:1px;background:rgba(34,34,34,.5);
  transform:scaleX(0);transform-origin:left;
  transition:transform .8s var(--ease-out-expo);
}
.company__row.is-visible .company__row-border{transform:scaleX(1)}

@media(min-width:768px){
  .company{padding:192px 0}
  .company__row{
    flex-direction:row;gap:0;
    padding:28px 0;
  }
  .company__row dt{width:200px}
}

/* ---------- CONTACT ---------- */
.contact{padding:128px 0;overflow:hidden}
.contact__heading{
  font-family:var(--font-display);
  font-size:clamp(1.8rem,5vw,3rem);
  font-weight:300;color:var(--fg);
  line-height:1.2;margin-bottom:24px;
}
.contact__lead{
  font-size:14px;color:var(--muted);
  font-weight:300;line-height:1.6;
  margin-bottom:64px;
}
.contact__thankyou{
  text-align:center;padding:80px 0;
}
.contact__thankyou-title{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,4vw,2rem);
  font-weight:300;color:var(--fg);
  margin-bottom:16px;
}
.contact__thankyou-text{
  font-size:14px;color:var(--muted);font-weight:300;
}
.contact__form{display:flex;flex-direction:column;gap:40px}
.contact__field label{
  display:block;
  font-family:var(--font-display);
  font-size:11px;letter-spacing:.15em;
  color:var(--fg);margin-bottom:8px;
  text-transform:uppercase;
}
.contact__field input,
.contact__field textarea{
  width:100%;
  background:transparent;
  border:none;border-bottom:1px solid rgba(34,34,34,.5);
  padding:12px;font-size:14px;
  color:var(--fg);font-weight:300;
  transition:border-color .3s;
  outline:none;
  border-radius:10px;
  -webkit-appearance:none;
}
.contact__field input::placeholder,
.contact__field textarea::placeholder{
  color:rgba(255,255,255,.5);
}
.contact__field input:focus,
.contact__field textarea:focus{
  border-color:var(--fg);
}
.contact__field textarea{resize:none}
.contact__submit{margin-top:16px}
.contact__submit button{
  display:inline-flex;align-items:center;gap:12px;
  border:1px solid rgba(34,34,34,.5);
  padding:20px 40px;
  color:var(--fg);
  transition:all .5s;
}
.contact__submit button:hover{
  background:var(--fg);color:var(--bg);
}
.contact__submit button:disabled{opacity:.5;cursor:not-allowed}
.contact__submit button span{
  font-family:var(--font-display);
  font-size:14px;letter-spacing:.2em;
}
.contact__submit button svg{
  width:16px;height:16px;
  transition:transform .3s;
}
.contact__submit button:hover svg{
  transform:translate(2px,-2px);
}
.contact__error{
  font-size:14px;color:#dc2626;font-weight:300;
}
.contact__recaptcha-note{
  font-size:10px;color:rgba(136,136,136,.4);
  font-weight:300;line-height:1.6;
}
.contact__recaptcha-note a{
  text-decoration:underline;transition:color .3s;
}
.contact__recaptcha-note a:hover{color:var(--muted)}

@media(min-width:768px){
  .contact{padding:192px 0}
}

/* ---------- FOOTER ---------- */
.footer{
  border-top:1px solid rgba(34,34,34,.3);
  padding:64px 0;
}
.footer__top{
  display:flex;flex-direction:column;gap:48px;
}
.footer__logo{display:block;width:100px}
.footer__logo img{
  width:100%;height:auto;
  filter:invert(1) brightness(2);
}
.footer__brand-sub{
  font-size:12px;color:var(--muted);
  font-weight:300;margin-top:12px;
}
.footer__nav ul{display:flex;flex-wrap:wrap;gap:24px 32px}
.footer__nav a{
  font-family:var(--font-display);
  font-size:11px;letter-spacing:.15em;
  color:var(--muted);transition:color .3s;
}
.footer__nav a:hover{color:var(--fg)}
.footer__bottom{
  margin-top:64px;
}
.footer__bottom p{
  font-size:11px;color:rgba(136,136,136,.6);
  font-weight:300;letter-spacing:.05em;
}

@media(min-width:768px){
  .footer{padding:80px 0}
  .footer__top{
    flex-direction:row;justify-content:space-between;
    align-items:flex-start;gap:0;
  }
  .footer__bottom{margin-top:80px}
}

/* ---------- SR ONLY ---------- */
.sr-only{
  position:absolute;width:1px;height:1px;
  padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border-width:0;
}