/* ============================================================
   SEIKA — 会社紹介サイト 共通スタイル
   ============================================================ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --dark:      #1A1235;
  --dark-2:    #110E26;
  --dark-card: #221640;
  --purple:    #7C5CBF;
  --mid:       #9B7DD4;
  --lt:        #C4AEED;
  --lav:       #F5F2FC;
  --lav2:      #EDE8F8;
  --muted:     #C0B8D8;
  --white:     #FFFFFF;
  --td:        #1E1442;
  --tm:        rgba(45,31,94,0.56);
}
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  font-family: 'Inter','Hiragino Kaku Gothic ProN','Noto Sans JP','Yu Gothic',sans-serif;
  background: var(--dark); color: var(--white);
  line-height: 1.75; overflow-x: hidden; -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 900; line-height: 1.15; }
.container { max-width: 1060px; margin: 0 auto; padding: 0 2.5rem; }

/* EYEBROW / TITLES */
.ey { display: flex; align-items: center; gap: .875rem; font-size: .68rem; font-weight: 600; letter-spacing: .28em; text-transform: uppercase; color: var(--mid); margin-bottom: 2rem; }
.ey::before { content: ''; width: 24px; height: 1px; background: currentColor; flex-shrink: 0; }
.ey.d { color: var(--purple); }
.ey.d::before { background: var(--purple); }
.ttl { font-size: clamp(1.9rem,3.6vw,2.7rem); font-weight: 900; letter-spacing: -.025em; }
.on-l { color: var(--td); }
.acc { color: var(--mid); }
.acc-d { color: var(--purple); }
.lead { font-size: 1rem; color: rgba(255,255,255,.5); line-height: 1.95; margin-top: 1.25rem; max-width: 560px; }
.lead.l { color: var(--tm); }
.body-text { font-size: .95rem; color: rgba(255,255,255,.52); line-height: 2; max-width: 720px; }
.body-text + .body-text { margin-top: 1.5rem; }
.body-text.l { color: var(--tm); }
strong.hl { color: rgba(255,255,255,.82); font-weight: 700; }
.on-l strong.hl { color: var(--td); }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .9rem 2rem; border-radius: 3px; font-size: .875rem; font-weight: 700; letter-spacing: .02em; text-decoration: none; cursor: pointer; border: none; transition: all .2s; }
.btn-p { background: var(--purple); color: var(--white); }
.btn-p:hover { background: #8B6ACC; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(124,92,191,.3); }
.btn-g { background: transparent; color: rgba(255,255,255,.58); border: 1px solid rgba(255,255,255,.15); }
.btn-g:hover { color: var(--white); border-color: rgba(255,255,255,.35); }
.btn-d { background: transparent; color: var(--purple); border: 1.5px solid var(--purple); }
.btn-d:hover { background: var(--purple); color: var(--white); }
.btn-w { background: #fff; color: var(--purple); padding: 1rem 2.5rem; border-radius: 3px; font-size: .9rem; font-weight: 800; text-decoration: none; display: inline-flex; align-items: center; gap: .5rem; transition: all .2s; }
.btn-w:hover { background: rgba(255,255,255,.92); transform: translateY(-1px); }

/* PROGRESS BAR */
#progress-bar { position: fixed; top: 0; left: 0; height: 2px; background: linear-gradient(90deg, var(--purple), var(--mid)); width: 0%; z-index: 200; transition: width .1s linear; }

/* NAV */
nav.site-nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 1.5rem 2.5rem; display: flex; align-items: center; justify-content: space-between; transition: all .3s; }
nav.site-nav.sc { background: rgba(17,14,38,.93); backdrop-filter: blur(20px) saturate(180%); -webkit-backdrop-filter: blur(20px) saturate(180%); padding-top: 1rem; padding-bottom: 1rem; border-bottom: 1px solid rgba(124,92,191,.1); }
.logo { font-size: .95rem; font-weight: 800; letter-spacing: .25em; text-transform: uppercase; color: var(--white); text-decoration: none; }
.logo em { color: var(--mid); font-style: normal; }
.nav-links { display: flex; gap: 2.25rem; list-style: none; align-items: center; }
.nav-links a { font-size: .8rem; font-weight: 500; letter-spacing: .04em; color: rgba(255,255,255,.52); text-decoration: none; transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-right { display: flex; align-items: center; gap: 1rem; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; z-index: 101; position: relative; }
.hamburger span { display: block; width: 22px; height: 1.5px; background: rgba(255,255,255,.8); border-radius: 2px; transition: transform .25s, opacity .25s; }
.hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
.nav-cta-m { display: none; }

/* HERO */
#hero { min-height: 82vh; display: flex; align-items: center; position: relative; overflow: hidden; padding-top: 7rem; padding-bottom: 4rem; }
#hero.short { min-height: 62vh; }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(ellipse 70% 80% at 75% 50%, rgba(124,92,191,.12) 0%, transparent 70%), radial-gradient(ellipse 40% 60% at 10% 80%, rgba(155,125,212,.06) 0%, transparent 60%); }
.hero-inner { position: relative; z-index: 2; width: 100%; }
.hero-grid { display: grid; grid-template-columns: 1fr .9fr; gap: 2rem; align-items: center; }
.h-eye { display: flex; align-items: center; gap: .875rem; font-size: .68rem; font-weight: 600; letter-spacing: .28em; text-transform: uppercase; color: var(--mid); margin-bottom: 2.25rem; opacity: 0; animation: up 1s cubic-bezier(.16,1,.3,1) .15s forwards; }
.h-eye::before { content: ''; width: 24px; height: 1px; background: currentColor; flex-shrink: 0; }
.h-title { font-size: clamp(2rem,4vw,3.2rem); font-weight: 900; line-height: 1.14; letter-spacing: -.03em; margin-bottom: 2rem; opacity: 0; animation: up 1s cubic-bezier(.16,1,.3,1) .3s forwards; }
.h-title .hl { color: var(--mid); display: block; }
.h-sub { font-size: clamp(.9rem,1.4vw,1.05rem); color: rgba(255,255,255,.52); line-height: 2; max-width: 560px; margin-bottom: 2.5rem; opacity: 0; animation: up 1s cubic-bezier(.16,1,.3,1) .45s forwards; }
.h-sub strong { color: rgba(255,255,255,.9); font-weight: 700; }
.h-cta { display: flex; gap: .875rem; flex-wrap: wrap; opacity: 0; animation: up 1s cubic-bezier(.16,1,.3,1) .6s forwards; }
.h-right { position: relative; display: flex; align-items: center; justify-content: flex-end; min-height: 420px; opacity: 0; animation: fadeIn 1.5s ease .8s forwards; }
#hero-sphere { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

/* BREADCRUMB */
.breadcrumb { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; font-size: .75rem; color: rgba(255,255,255,.28); margin-bottom: 2rem; opacity: 0; animation: up 1s cubic-bezier(.16,1,.3,1) .1s forwards; }
.breadcrumb a { color: rgba(255,255,255,.35); text-decoration: none; transition: color .2s; }
.breadcrumb a:hover { color: var(--mid); }
.breadcrumb span { color: rgba(255,255,255,.18); }

/* SECTIONS */
section { padding: 7.5rem 0; }
.sec-lav { background: var(--lav); }
.sec-card { background: var(--dark-card); border-top: 1px solid rgba(124,92,191,.08); border-bottom: 1px solid rgba(124,92,191,.08); }
.sec-h { margin-bottom: 4rem; }
.sec-h.center { text-align: center; }
.sec-h.center .lead { margin-left: auto; margin-right: auto; }

/* CARD GRID (light) */
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5px; background: var(--muted); border: 1.5px solid var(--muted); border-radius: 10px; overflow: hidden; margin-top: 1rem; }
.card-l { background: var(--white); padding: 2.75rem; transition: background .2s; }
.card-l:hover { background: #FAFAFE; }
.card-n { font-size: .67rem; font-weight: 700; letter-spacing: .22em; color: var(--purple); margin-bottom: 1.25rem; }
.card-title { font-size: 1.05rem; font-weight: 800; color: var(--td); margin-bottom: .75rem; line-height: 1.45; }
.card-body { font-size: .875rem; color: var(--tm); line-height: 1.9; }
.card-wide { grid-column: 1 / -1; }

/* CARD GRID (dark) */
.grid-3-d { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; margin-top: 1rem; }
.card-d { background: var(--dark-card); border: 1px solid rgba(124,92,191,.15); border-radius: 10px; padding: 2.25rem; }
.card-d.featured { border-color: rgba(155,125,212,.4); background: rgba(124,92,191,.09); }
.card-d .card-n { color: var(--mid); }
.card-d .card-title { color: #fff; }
.card-d .card-body { color: rgba(255,255,255,.45); }

/* VALUES / REASON LIST */
.reason-list { border-top: 1px solid rgba(255,255,255,.05); margin-top: .5rem; }
.reason-item { display: grid; grid-template-columns: 72px 1fr; gap: 0 2.5rem; padding: 3.25rem 0; border-bottom: 1px solid rgba(255,255,255,.05); }
.reason-n { font-size: .7rem; font-weight: 700; letter-spacing: .2em; color: rgba(124,92,191,.35); padding-top: .3rem; }
.reason-title { font-size: 1.15rem; font-weight: 800; margin-bottom: .875rem; }
.reason-body { font-size: .9rem; color: rgba(255,255,255,.46); line-height: 1.95; max-width: 580px; }

/* DEFINITION TABLE (会社概要) */
.ctable { margin-top: 1rem; border: 1.5px solid var(--muted); border-radius: 10px; overflow: hidden; background: var(--muted); display: grid; gap: 1.5px; }
.ctable .row { display: grid; grid-template-columns: 220px 1fr; background: var(--white); }
.ctable .row .k { padding: 1.5rem 2rem; font-size: .8rem; font-weight: 700; letter-spacing: .08em; color: var(--purple); background: #FAFAFE; border-right: 1.5px solid var(--muted); }
.ctable .row .v { padding: 1.5rem 2rem; font-size: .92rem; font-weight: 600; color: var(--td); line-height: 1.7; }
.ctable .row .v a { color: var(--purple); text-decoration: none; border-bottom: 1px solid rgba(124,92,191,.3); }
.ctable .row .v a:hover { border-color: var(--purple); }

/* PROFILE CARD (代表) */
.profile-card { display: grid; grid-template-columns: 200px 1fr; gap: 4rem; align-items: start; background: var(--dark-card); border: 1px solid rgba(124,92,191,.2); border-radius: 12px; padding: 3.5rem; margin-top: 3rem; }
.profile-avatar { width: 160px; height: 160px; border-radius: 50%; background: linear-gradient(135deg, rgba(124,92,191,.35) 0%, rgba(155,125,212,.15) 100%); border: 2px solid rgba(124,92,191,.3); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.profile-avatar-inner { font-size: 3.5rem; font-weight: 900; color: var(--mid); letter-spacing: -.05em; }
.profile-meta { display: flex; flex-direction: column; gap: .5rem; }
.profile-name { font-size: clamp(1.6rem,3vw,2.2rem); font-weight: 900; letter-spacing: -.03em; }
.profile-name-en { font-size: .8rem; font-weight: 500; letter-spacing: .18em; color: rgba(255,255,255,.32); margin-top: .25rem; text-transform: uppercase; }
.profile-title { display: inline-block; width: fit-content; font-size: .72rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--mid); background: rgba(124,92,191,.12); border: 1px solid rgba(124,92,191,.25); border-radius: 3px; padding: .25rem .75rem; margin-top: .75rem; }
.profile-company { font-size: .92rem; color: rgba(255,255,255,.5); margin-top: .5rem; }
.profile-desc { font-size: .95rem; color: rgba(255,255,255,.5); line-height: 2; margin-top: 1.5rem; max-width: 560px; }
.profile-info { display: flex; flex-direction: column; gap: .875rem; margin-top: 2rem; }
.pi-row { display: flex; gap: 1.25rem; align-items: flex-start; }
.pi-label { font-size: .65rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; color: rgba(155,125,212,.6); min-width: 56px; padding-top: .12rem; }
.pi-val { font-size: .875rem; color: rgba(255,255,255,.55); line-height: 1.65; }
.pi-val a { color: rgba(255,255,255,.55); text-decoration: none; border-bottom: 1px solid rgba(255,255,255,.12); transition: all .2s; }
.pi-val a:hover { color: var(--mid); border-color: var(--mid); }

/* MISSION BLOCK */
.mission-block { background: linear-gradient(135deg, rgba(124,92,191,.1) 0%, rgba(155,125,212,.05) 100%); border: 1px solid rgba(124,92,191,.2); border-left: 3px solid var(--purple); border-radius: 4px; padding: 2.5rem; margin-top: 3rem; }
.mission-label { font-size: .65rem; font-weight: 700; letter-spacing: .22em; text-transform: uppercase; color: var(--mid); margin-bottom: 1rem; }
.mission-text { font-size: 1.15rem; font-weight: 800; line-height: 1.65; color: rgba(255,255,255,.88); }

/* CHECK LIST */
.check-list { list-style: none; display: flex; flex-direction: column; gap: 1rem; margin-top: 2rem; }
.check-list li { display: flex; align-items: flex-start; gap: .875rem; font-size: .92rem; color: rgba(255,255,255,.52); line-height: 1.75; }
.check-list li::before { content: ''; width: 18px; height: 18px; background: rgba(124,92,191,.18); border: 1px solid rgba(124,92,191,.35); border-radius: 3px; flex-shrink: 0; margin-top: .15rem; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 12 10' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 5l3.5 3.5L11 1' stroke='%239B7DD4' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: center; background-size: 10px; }

/* CTA BAND */
#cta-mid { background: var(--purple); padding: 5rem 0; }
.cta-mid-inner { display: flex; align-items: center; justify-content: space-between; gap: 3rem; flex-wrap: wrap; }
.cta-mid-txt h3 { font-size: clamp(1.5rem,2.5vw,2rem); font-weight: 900; letter-spacing: -.02em; color: #fff; margin-bottom: .625rem; }
.cta-mid-txt p { font-size: .9rem; color: rgba(255,255,255,.72); }

/* CONTACT */
#contact { background: var(--dark); padding-bottom: 7rem; }
#contact.card-bg { background: var(--dark-card); border-top: 1px solid rgba(124,92,191,.08); }
.contact-lay { display: grid; grid-template-columns: 1fr 460px; gap: 6rem; align-items: start; }
.c-sub { font-size: 1rem; color: rgba(255,255,255,.5); line-height: 1.95; margin-top: 1.5rem; max-width: 430px; }
.cinfo { list-style: none; margin-top: 2.5rem; display: flex; flex-direction: column; gap: 1.5rem; }
.ci-r { display: flex; gap: 1.5rem; }
.ci-l { font-size: .67rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; color: rgba(155,125,212,.65); min-width: 56px; padding-top: .15rem; }
.ci-v { font-size: .88rem; color: rgba(255,255,255,.62); line-height: 1.7; }
.ci-v a { color: rgba(255,255,255,.62); text-decoration: none; border-bottom: 1px solid rgba(255,255,255,.12); transition: all .2s; }
.ci-v a:hover { color: var(--mid); border-color: var(--mid); }
.form-box { background: var(--dark-card); border: 1px solid rgba(124,92,191,.15); border-radius: 10px; padding: 2.75rem; }
#contact.card-bg .form-box { background: var(--dark); }
.form-h { font-size: 1.05rem; font-weight: 800; margin-bottom: .375rem; }
.form-hint { font-size: .8rem; color: rgba(255,255,255,.3); margin: .25rem 0 1.75rem; line-height: 1.7; }
.fg { margin-bottom: 1.5rem; }
.fl { display: block; font-size: .72rem; font-weight: 600; letter-spacing: .06em; color: rgba(255,255,255,.38); margin-bottom: .5rem; }
.fi, .fta { width: 100%; background: transparent; border: none; border-bottom: 1px solid rgba(255,255,255,.1); padding: .625rem 0; color: var(--white); font-size: .9rem; font-family: inherit; outline: none; transition: border-color .2s; border-radius: 0; }
.fi::placeholder, .fta::placeholder { color: rgba(255,255,255,.17); }
.fi:focus, .fta:focus { border-bottom-color: var(--mid); }
.fta { resize: vertical; min-height: 84px; }
.fsbtn { width: 100%; margin-top: .25rem; background: var(--purple); color: var(--white); border: none; border-radius: 4px; padding: .9rem; font-size: .9rem; font-weight: 700; font-family: inherit; cursor: pointer; letter-spacing: .03em; transition: background .2s, transform .15s; }
.fsbtn:hover { background: #8B6ACC; transform: translateY(-1px); }
.f-note { font-size: .72rem; color: rgba(255,255,255,.2); text-align: center; margin-top: 1rem; }

/* FOOTER */
footer { background: var(--dark-2); border-top: 1px solid rgba(255,255,255,.04); padding: 4rem 0 2rem; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.f-brand .logo { display: inline-block; margin-bottom: 1rem; font-size: 1.1rem; }
.f-tagline { font-size: .82rem; color: rgba(255,255,255,.35); line-height: 1.8; max-width: 260px; margin-bottom: 1rem; }
.f-brand .f-sub { font-size: .68rem; color: rgba(255,255,255,.22); letter-spacing: .04em; }
.f-col-title { font-size: .68rem; font-weight: 700; letter-spacing: .2em; text-transform: uppercase; color: rgba(255,255,255,.35); margin-bottom: 1.25rem; }
.f-links { list-style: none; display: flex; flex-direction: column; gap: .625rem; }
.f-links a { font-size: .82rem; color: rgba(255,255,255,.45); text-decoration: none; transition: color .2s; }
.f-links a:hover { color: var(--white); }
.f-links li.plain { color: rgba(255,255,255,.55); font-size: .82rem; }
.f-addr { margin-top: 1.25rem; font-size: .78rem; color: rgba(255,255,255,.3); line-height: 2; }
.f-bottom { border-top: 1px solid rgba(255,255,255,.04); padding-top: 1.5rem; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .75rem; }
.f-bottom-l, .f-bottom-r { font-size: .72rem; color: rgba(255,255,255,.2); }

/* REVEAL */
.rv { opacity: 0; transform: translateY(16px); transition: opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1); }
.rv.on { opacity: 1; transform: none; }
.d1 { transition-delay: .08s; } .d2 { transition-delay: .16s; } .d3 { transition-delay: .24s; } .d4 { transition-delay: .32s; }
@keyframes up { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* RESPONSIVE */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .h-right { min-height: 280px; margin-top: 1rem; }
  .grid-3-d { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .profile-card { grid-template-columns: 160px 1fr; gap: 2.5rem; }
}
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .contact-lay { grid-template-columns: 1fr; gap: 3.5rem; }
  .card-wide { grid-column: 1; }
  .ctable .row { grid-template-columns: 130px 1fr; }
  .ctable .row .k { padding: 1.25rem 1.25rem; }
  .ctable .row .v { padding: 1.25rem 1.25rem; }
  .profile-card { grid-template-columns: 1fr; gap: 2rem; padding: 2.5rem; }
  .profile-avatar { width: 120px; height: 120px; }
  .profile-avatar-inner { font-size: 2.5rem; }
  .cta-mid-inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 680px) {
  nav.site-nav { padding: 1rem 1.5rem; }
  .nav-cta-d { display: none !important; }
  .hamburger { display: flex; }
  .nav-links { display: none; position: fixed; inset: 0; background: rgba(17,14,38,.97); flex-direction: column; align-items: center; justify-content: center; gap: 2.5rem; z-index: 99; }
  .nav-links.open { display: flex; }
  .nav-links li a { font-size: 1.1rem; letter-spacing: .06em; color: rgba(255,255,255,.7); }
  .nav-cta-m { display: block; }
  .nav-cta-m a { font-size: 1rem !important; padding: .875rem 2rem !important; letter-spacing: .04em; }
  section { padding: 5rem 0; }
  .container { padding: 0 1.5rem; }
  nav.site-nav.sc { backdrop-filter: none !important; -webkit-backdrop-filter: none !important; background: rgba(17,14,38,.97) !important; }
  .nav-links { z-index: 200 !important; }
  p, h1, h2, h3, h4, li, td, th, span { overflow-wrap: break-word; }
  .ttl br, h1 br, h2 br { display: none; }
  .h-title { font-size: clamp(1.6rem,7vw,2.2rem); letter-spacing: -.02em; }
  .h-title br { display: none; }
  .h-eye { letter-spacing: .12em; font-size: .6rem; }
  .reason-item { grid-template-columns: 52px 1fr; gap: 0 1rem; }
  .form-box { padding: 2rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .mission-text { font-size: 1rem; }
}