/* ==========================================================================
   BlancBlanche corporate site
   Base: #FFFFFF / Sub: #f5f5f5 / Fill: #000000+#FFFFFF text / Accent: #b8d200
   Text: #222222 / Border: #E5E5E5
   Headings & fill-button: Noto Sans JP 700 / Body: Noto Sans JP 400 / Numerals: Inter 700
   ========================================================================== */

:root{
  --color-base:#FFFFFF;
  --color-sub:#f5f5f5;
  --color-black:#000000;
  --color-accent:#b8d200;
  --color-text:#222222;
  --color-muted:#666666;
  --color-muted2:#999999;
  --color-border:#E5E5E5;
  --font-jp:'Noto Sans JP',sans-serif;
  --font-en:'Inter',sans-serif;
  --header-height:72px;
  --max-w:1200px;
  --max-w-narrow:800px;
  --side-pad:clamp(20px,5vw,40px);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--font-jp);
  background:var(--color-base);
  color:var(--color-text);
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}

img{max-width:100%;display:block}
a{color:inherit}
a:hover{opacity:.6}

.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 var(--side-pad)}
.container-narrow{width:100%;max-width:var(--max-w-narrow);margin:0 auto;padding:0 var(--side-pad)}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-height);
  z-index:1000;display:flex;align-items:center;justify-content:center;
  background:transparent;backdrop-filter:none;-webkit-backdrop-filter:none;
  transition:background .3s ease;
}
.site-header.is-scrolled{
  background:rgba(255,255,255,.75);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between}

.logo{display:flex;align-items:center;text-decoration:none}
.logo img{height:28px;width:auto}

.nav-desktop{display:flex;align-items:center;gap:32px}
.nav-desktop a{font-weight:400;font-size:15px;text-decoration:none;color:var(--color-text)}
.nav-desktop a.is-active{font-weight:700;border-bottom:2px solid var(--color-accent);padding-bottom:4px}
.nav-desktop a.btn-contact{
  font-weight:700;font-size:14px;color:#FFFFFF;background:var(--color-black);
  padding:10px 28px;border-radius:4px;white-space:nowrap;border-bottom:none;
}
.nav-desktop a.btn-contact.is-active{box-shadow:0 2px 0 0 var(--color-accent)}

.hamburger{
  display:none;width:32px;height:32px;flex-direction:column;justify-content:center;
  align-items:center;gap:6px;background:none;border:none;cursor:pointer;padding:0;
}
.hamburger span{width:24px;height:2px;background:var(--color-text)}

@media (max-width:859px){
  .nav-desktop{display:none}
  .hamburger{display:flex}
}

.mobile-menu{
  position:fixed;inset:0;background:#FFFFFF;z-index:2000;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:36px;
  transform:translateX(100%);
  opacity:0;
  pointer-events:none;
  transition:transform .45s cubic-bezier(.4,0,.2,1), opacity .3s ease;
}
.mobile-menu.is-open{
  transform:translateX(0);
  opacity:1;
  pointer-events:auto;
}
.mobile-menu .close-btn{
  position:absolute;top:24px;right:var(--side-pad);font-size:32px;
  background:none;border:none;cursor:pointer;color:var(--color-text);line-height:1;
}
.mobile-menu a{
  font-weight:700;font-size:24px;color:var(--color-text);text-decoration:none;
  opacity:0;transform:translateY(14px);
  transition:opacity .35s ease, transform .35s ease;
}
.mobile-menu.is-open a{opacity:1;transform:translateY(0)}
.mobile-menu.is-open a:nth-child(2){transition-delay:.05s}
.mobile-menu.is-open a:nth-child(3){transition-delay:.1s}
.mobile-menu.is-open a:nth-child(4){transition-delay:.15s}
.mobile-menu.is-open a:nth-child(5){transition-delay:.2s}
.mobile-menu.is-open a:nth-child(6){transition-delay:.25s}
.mobile-menu a.is-active{color:var(--color-accent)}
.mobile-menu a.btn-contact{
  font-size:16px;color:#FFFFFF;background:var(--color-black);
  padding:14px 40px;border-radius:4px;margin-top:12px;
}

body.menu-open{overflow:hidden}

/* ---------- Hero (TOP) ---------- */
.hero{
  position:relative;height:100vh;min-height:600px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  overflow:hidden;padding-top:var(--header-height);box-sizing:border-box;
  background-image:url('../assets/hero-silk-bg.png');background-size:cover;background-position:center;
}
.hero-inner{position:relative;z-index:1;max-width:760px;padding:0 var(--side-pad);text-align:center}
.hero h1{font-family:var(--font-en);font-weight:700;font-size:clamp(32px,5.5vw,60px);line-height:1.3;color:var(--color-text);margin:0}
.hero p{font-size:clamp(14px,1.8vw,16px);line-height:1.9;color:var(--color-muted);margin:20px auto 0;max-width:600px}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{height:280px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding-top:var(--header-height);box-sizing:border-box}
.page-hero .title-block{display:inline-flex;flex-direction:column;align-items:stretch}
.page-hero h1{font-weight:700;font-size:clamp(24px,4vw,40px);color:var(--color-text);margin:0;white-space:nowrap}
.page-hero .rule{height:2px;background:var(--color-black);margin:20px 0 0;width:100%}
.page-hero .eyebrow{font-family:var(--font-en);font-weight:700;font-size:13px;letter-spacing:3px;color:var(--color-muted2);margin-top:20px}

/* ---------- Section helpers ---------- */
.section{padding:120px 0}
.section-sub{background:var(--color-sub)}
.section-tight{padding:56px 0 120px}
.section-lead{padding:56px 0 0}
.section-heading{font-weight:700;font-size:clamp(22px,3vw,28px);color:var(--color-text);margin:0 0 56px;text-align:center}
.section-heading-sm{font-weight:700;font-size:clamp(18px,2.2vw,22px);color:var(--color-text);margin:0 0 20px;text-align:center}
.section-body-center{font-size:15px;line-height:2;color:var(--color-text);max-width:760px;margin:0 auto 56px;text-align:center}

@media (max-width:859px){
  .section{padding:72px 0}
}

/* ---------- TOP: About ---------- */
.about{display:flex;gap:64px;align-items:center;flex-wrap:wrap}
.about-media{
  flex:1 1 320px;min-width:280px;height:360px;position:relative;border-radius:8px;
  overflow:hidden;transform:rotate(-1.5deg) translateY(-10px);box-shadow:0 16px 32px rgba(0,0,0,.06);
}
.about-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.about-media::after{content:'';position:absolute;inset:0;box-shadow:inset 0 0 60px 30px #FFFFFF}
.about-text{flex:1 1 320px;min-width:280px;transform:translateY(24px)}
.about-text h2{font-weight:700;font-size:clamp(20px,3vw,24px);color:var(--color-text);margin:0 0 20px}
.about-text p{font-weight:400;font-size:16px;line-height:2;color:var(--color-text);margin:0 0 20px}
.about-text p:last-child{margin-bottom:0}

/* ---------- TOP: feature cards ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
@media (max-width:859px){.feature-grid{grid-template-columns:1fr}}
.feature-card{background:var(--color-base);border:1px solid var(--color-border);border-radius:12px;overflow:hidden}
.feature-card .thumb{aspect-ratio:16/9;background-size:cover;background-position:center}
.feature-card .body{padding:28px}
.feature-card h3{font-weight:700;font-size:18px;color:var(--color-text);margin:0 0 12px}
.feature-card p{font-weight:400;font-size:14px;line-height:1.9;color:var(--color-text);margin:0}

/* ---------- SERVICE: numbered items ---------- */
.service-list{display:flex;flex-direction:column;gap:32px}
.service-item{
  border:1px solid var(--color-border);border-radius:16px;padding:40px;
  display:flex;gap:40px;align-items:flex-start;flex-wrap:wrap;
}
.service-item .num{font-family:var(--font-en);font-weight:700;font-size:48px;color:var(--color-accent);line-height:1;display:flex;align-items:center}
.service-item .divider{width:2px;align-self:stretch;background:var(--color-black)}
.service-item .content{flex:1;min-width:240px}
.service-item h3{font-weight:700;font-size:20px;color:var(--color-text);margin:0 0 12px}
.service-item p{font-weight:400;font-size:15px;line-height:1.9;color:var(--color-text);margin:0}
@media (max-width:600px){
  .service-item{padding:28px}
  .service-item .divider{display:none}
}

/* ---------- SERVICE: timeline ---------- */
.timeline{position:relative}
.timeline::before{content:'';position:absolute;left:23px;top:8px;bottom:8px;width:2px;background:var(--color-border)}
.timeline-step{position:relative;padding-left:64px;margin-bottom:44px}
.timeline-step:last-child{margin-bottom:0}
.timeline-step .badge{
  position:absolute;left:0;top:0;width:48px;height:48px;border-radius:50%;
  background:var(--color-black);color:#FFFFFF;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-en);font-weight:700;font-size:18px;
}
.timeline-step h4{font-weight:700;font-size:17px;color:var(--color-text);margin:8px 0 8px}
.timeline-step p{font-weight:400;font-size:14px;line-height:1.9;color:var(--color-text);margin:0}

/* ---------- WHY: intro cards ---------- */
.why-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px}
.why-card{background:var(--color-sub);border-radius:16px;padding:36px}
.why-card h3{font-weight:700;font-size:17px;color:var(--color-text);margin:0 0 16px}
.why-card p{font-weight:400;font-size:14px;line-height:1.9;color:var(--color-text);margin:0}

/* ---------- WHY: benefits diagram ---------- */
.benefits{display:flex;flex-wrap:wrap;justify-content:center;gap:40px 28px;padding:20px 0 32px}
.benefit-card{
  background:var(--color-base);border:1px solid var(--color-border);border-radius:12px;
  padding:28px;width:230px;box-shadow:0 8px 20px rgba(0,0,0,.05);
}
.benefit-card:nth-child(1){transform:rotate(-2.5deg)}
.benefit-card:nth-child(2){transform:rotate(1.8deg) translateY(18px)}
.benefit-card:nth-child(3){transform:rotate(-1deg) translateY(-14px)}
.benefit-card:nth-child(4){transform:rotate(3deg) translateY(10px)}
.benefit-card:nth-child(5){transform:rotate(-2deg) translateY(4px)}
.benefit-card .dot{width:8px;height:8px;border-radius:50%;background:var(--color-accent);margin-bottom:14px}
.benefit-card h3{font-weight:700;font-size:16px;color:var(--color-text);margin:0 0 10px}
.benefit-card p{font-weight:400;font-size:13px;line-height:1.8;color:var(--color-text);margin:0}
.benefits-note{font-weight:400;font-size:14px;line-height:1.9;color:var(--color-text);max-width:700px;margin:56px auto 0;text-align:center}

/* ---------- WHY: text blocks ---------- */
.text-block h2{font-weight:700;font-size:clamp(20px,3vw,24px);color:var(--color-text);margin:0 0 24px}
.text-block p{font-weight:400;font-size:15px;line-height:2;color:var(--color-text);margin:0 0 16px}
.text-block p:last-child{margin-bottom:0}
.text-block + .text-block{margin-top:56px}

/* ---------- COMPANY: info table ---------- */
.info-table{border-top:1px solid var(--color-border)}
.info-row{display:flex;flex-wrap:wrap;gap:8px 24px;padding:24px 0;border-bottom:1px solid var(--color-border)}
.info-row dt{width:160px;font-weight:700;font-size:15px;color:var(--color-text);margin:0}
.info-row dd{flex:1;min-width:200px;font-weight:400;font-size:15px;color:var(--color-text);margin:0}

/* ---------- COMPANY: FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:32px}
.faq-item .qa-row{display:flex;gap:16px;align-items:flex-start}
.faq-item .qa-row + .qa-row{margin-top:12px}
.faq-item .badge{
  width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  flex-shrink:0;font-family:var(--font-en);font-weight:700;font-size:15px;
}
.faq-item .badge.q{background:var(--color-black);color:#FFFFFF}
.faq-item .badge.a{background:var(--color-sub);color:var(--color-text);border:1px solid var(--color-border)}
.faq-item .q-text{font-weight:700;font-size:16px;color:var(--color-text);padding-top:5px}
.faq-item .a-text{font-weight:400;font-size:15px;line-height:1.9;color:var(--color-text);padding-top:5px}

/* ---------- CONTACT ---------- */
.contact-lead{font-weight:400;font-size:15px;line-height:1.9;color:var(--color-text);margin:0 0 56px;text-align:center}
/* ---------- Contact form (posts to a linked Google Form) ---------- */
.contact-form{
  display:flex;
  flex-direction:column;
  gap:28px;
  text-align:left;
}
.form-field{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.form-field label{
  font-weight:700;
  font-size:14px;
  color:var(--color-text);
}
.form-field .required{
  color:var(--color-accent);
  margin-left:2px;
}
.form-field input,
.form-field textarea{
  font-family:var(--font-jp);
  font-size:15px;
  color:var(--color-text);
  background:var(--color-base);
  border:1px solid var(--color-border);
  border-radius:8px;
  padding:14px 16px;
  outline:none;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.form-field input:focus,
.form-field textarea:focus{
  border-color:var(--color-black);
  box-shadow:0 0 0 3px rgba(0,0,0,.06);
}
.form-field textarea{
  min-height:160px;
  resize:vertical;
  line-height:1.8;
}
.btn-submit{
  align-self:center;
  font-family:var(--font-jp);
  font-weight:700;
  font-size:15px;
  color:#FFFFFF;
  background:var(--color-black);
  border:none;
  border-radius:4px;
  padding:16px 56px;
  cursor:pointer;
  transition:opacity .2s ease;
}
.btn-submit:hover{opacity:.6}
.btn-submit:disabled{opacity:.4;cursor:default}
.form-status{
  min-height:1.5em;
  font-size:14px;
  text-align:center;
}
.form-status.is-success{color:#2e7d32}
.form-status.is-error{color:#c62828}

/* ---------- Wave + Footer ---------- */
.wave-wrap{display:block;width:100%;height:48px;margin-bottom:-1px}
.wave-wrap.on-sub{background:var(--color-sub)}
.wave-wrap svg{display:block;width:100%;height:100%}

.site-footer{
  background:var(--color-black);padding:48px var(--side-pad) 64px;
  display:flex;flex-direction:column;align-items:center;gap:24px;box-sizing:border-box;
}
.site-footer img{width:60px;height:auto}
.footer-nav{display:flex;gap:24px;flex-wrap:wrap;justify-content:center}
.footer-nav a{font-weight:400;font-size:14px;color:#FFFFFF;text-decoration:none}
.footer-copyright{font-family:var(--font-en);font-size:12px;color:#888888}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed;right:24px;bottom:32px;width:48px;height:48px;border-radius:50%;
  background:rgba(0,0,0,.6);border:none;cursor:pointer;display:none;align-items:center;justify-content:center;
  z-index:900;
}
.back-to-top.is-visible{display:flex}
.back-to-top svg{display:block}

/* Page flex layout so CONTACT footer sticks to bottom on short pages */
.page-flex{min-height:100vh;display:flex;flex-direction:column}
.page-flex main{flex:1}

/* ==========================================================================
   Motion: scroll reveal + entrance animations
   Footer, wave divider and back-to-top button are intentionally excluded.
   ========================================================================== */

/* ---------- Scroll reveal (fade up once, stays) ---------- */
.reveal{
  opacity:0;
  transform:translateY(32px);
  transition:opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1);
}
.reveal.is-visible{
  opacity:1;
  transform:translateY(0);
}

/* Elements that already carry a static decorative resting transform keep it;
   the reveal offset is baked into the same transform so both compose cleanly. */
.about-media.reveal{transform:rotate(-1.5deg) translateY(calc(-10px + 32px))}
.about-media.reveal.is-visible{transform:rotate(-1.5deg) translateY(-10px)}

.benefit-card.reveal:nth-child(1){transform:rotate(-2.5deg) translateY(calc(0px + 32px))}
.benefit-card.reveal:nth-child(2){transform:rotate(1.8deg) translateY(calc(18px + 32px))}
.benefit-card.reveal:nth-child(3){transform:rotate(-1deg) translateY(calc(-14px + 32px))}
.benefit-card.reveal:nth-child(4){transform:rotate(3deg) translateY(calc(10px + 32px))}
.benefit-card.reveal:nth-child(5){transform:rotate(-2deg) translateY(calc(4px + 32px))}
.benefit-card.reveal.is-visible:nth-child(1){transform:rotate(-2.5deg) translateY(0)}
.benefit-card.reveal.is-visible:nth-child(2){transform:rotate(1.8deg) translateY(18px)}
.benefit-card.reveal.is-visible:nth-child(3){transform:rotate(-1deg) translateY(-14px)}
.benefit-card.reveal.is-visible:nth-child(4){transform:rotate(3deg) translateY(10px)}
.benefit-card.reveal.is-visible:nth-child(5){transform:rotate(-2deg) translateY(4px)}

/* ---------- Hero entrance (TOP first view) ---------- */
@keyframes heroFadeUp{
  from{opacity:0;transform:translateY(28px)}
  to{opacity:1;transform:translateY(0)}
}
.hero h1 .letter{
  display:inline-block;
  opacity:0;
  transform:translateY(18px);
  animation:heroFadeUp .65s cubic-bezier(.16,1,.3,1) forwards;
}
.hero p{
  opacity:0;
  transform:translateY(16px);
  animation:heroFadeUp 1.3s cubic-bezier(.16,1,.3,1) forwards;
  animation-delay:1.65s;
}

/* ---------- Page hero entrance (inner pages) ---------- */
.page-hero .title-block{
  opacity:0;
  transform:translateY(20px);
  animation:heroFadeUp .7s cubic-bezier(.16,1,.3,1) forwards;
}
.page-hero .eyebrow{
  opacity:0;
  transform:translateY(14px);
  animation:heroFadeUp .7s cubic-bezier(.16,1,.3,1) forwards;
  animation-delay:.18s;
}

/* ---------- Respect reduced-motion preference ---------- */
@media (prefers-reduced-motion: reduce){
  *{
    animation-duration:.01ms !important;
    animation-delay:0s !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0s !important;
    scroll-behavior:auto !important;
  }
}