:root {
  --ak: #B45F2F;
  --ink: #2B3A4A;
  --cream: #FAF6F0;
  --cream-2: #F3ECE2;
  --green: #2F7D4F;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--cream);
  color: var(--ink);
  font-family: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', sans-serif;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--ak); color: #fff; }
input::placeholder, textarea::placeholder { color: rgba(43,58,74,.35); }

@keyframes bkmarquee { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
@keyframes bkpulse { 0%,100% { opacity: .45; } 50% { opacity: 1; } }
@keyframes bkdot { 0%,80%,100% { transform: translateY(0); opacity: .4; } 40% { transform: translateY(-5px); opacity: 1; } }

/* ---------- shared ---------- */
.container { max-width: 1120px; margin: 0 auto; }
.col { display: flex; flex-direction: column; }
.section { padding: clamp(76px, 10vw, 130px) 5vw; scroll-margin-top: 70px; }
.section-alt { background: var(--cream-2); }
.section-dark { background: var(--ink); color: var(--cream); position: relative; overflow: hidden; }
.section .container.col { gap: 56px; }
.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: clamp(40px, 6vw, 64px); align-items: start; position: relative; }

.eyebrow { font-family: Inter, sans-serif; font-weight: 600; font-size: 13px; letter-spacing: .22em; color: var(--ak); }
.section-head { display: flex; flex-direction: column; gap: 14px; }
h2 { margin: 0; font-size: clamp(30px, 3.6vw, 48px); font-weight: 900; line-height: 1.3; }
.tnum { font-variant-numeric: tabular-nums; }
.muted-note { font-size: 12px; color: rgba(43,58,74,.5); }

.pulse-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ak); animation: bkpulse 3s ease-in-out infinite; flex: none; }

.btn { display: inline-block; text-decoration: none; border-radius: 999px; font-weight: 700; font-family: inherit; cursor: pointer; text-align: center; }
.btn-primary { background: var(--ak); color: #fff; border: none; padding: 16px 34px; font-size: 15px; transition: transform .25s, box-shadow .25s; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(180,95,47,.35); }
.btn-outline { border: 1.5px solid rgba(43,58,74,.3); color: var(--ink); padding: 16px 34px; font-size: 15px; transition: border-color .25s, color .25s; }
.btn-outline:hover { border-color: var(--ak); color: var(--ak); }
.btn-ghost { background: transparent; border: 1px solid rgba(43,58,74,.25); padding: 10px 24px; font-size: 13px; color: var(--ink); white-space: nowrap; transition: border-color .25s, color .25s; }
.btn-ghost:hover { border-color: var(--ak); color: var(--ak); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 18px 5vw;
  background: rgba(250,246,240,.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(43,58,74,.1);
}
.nav-logo { display: flex; align-items: baseline; gap: 10px; text-decoration: none; color: var(--ink); }
.logo-mark { font-family: Inter, sans-serif; font-weight: 800; font-size: 22px; letter-spacing: -0.02em; }
.logo-i { position: relative; }
.logo-dot { position: absolute; top: 1px; left: 50%; transform: translateX(-50%); width: 5px; height: 5px; background: var(--ak); }
.logo-kana { font-size: 12px; font-weight: 500; color: rgba(43,58,74,.6); letter-spacing: .14em; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: clamp(14px, 2.4vw, 28px); font-size: 14px; font-weight: 500; }
.nav-links > a { color: var(--ink); text-decoration: none; white-space: nowrap; transition: color .25s; }
.nav-links > a:hover { color: var(--ak); }
.nav-lang { display: flex; align-items: center; gap: 6px; font-size: 12px; color: rgba(43,58,74,.45); white-space: nowrap; }
.nav-lang-ja { font-weight: 700; color: var(--ink); }
.nav-lang-en sup { font-size: 9px; margin-left: 2px; }
.nav-links > a.nav-cta { background: var(--ink); color: var(--cream); padding: 10px 22px; border-radius: 999px; font-size: 13px; font-weight: 700; transition: background .25s; }
.nav-links > a.nav-cta:hover { background: var(--ak); color: var(--cream); }

.nav-sub {
  display: none; gap: 22px; padding: 10px 5vw 12px;
  background: rgba(250,246,240,.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(43,58,74,.1);
  overflow-x: auto; font-size: 13px; font-weight: 500;
}
.nav-sub a { color: var(--ink); text-decoration: none; white-space: nowrap; }

@media (max-width: 959px) {
  .nav-links > a:not(.nav-cta), .nav-lang { display: none; }
  .nav-sub { display: flex; }
}

/* ---------- hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 0 5vw; min-height: 88vh;
  display: flex; align-items: center;
  cursor: crosshair;
}
#bk-cv { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-inner {
  position: relative; max-width: 1120px; margin: 0 auto; width: 100%;
  display: flex; flex-direction: column; gap: clamp(24px, 3.4vh, 34px);
  padding: clamp(80px, 13vh, 130px) 0 clamp(56px, 10vh, 110px); pointer-events: none;
}
.hero-eyebrow { display: flex; align-items: center; gap: 14px; font-family: Inter, sans-serif; font-weight: 600; font-size: 13px; letter-spacing: .2em; color: rgba(43,58,74,.6); }
.hero h1 { margin: 0; font-size: clamp(42px, 6.6vw, 98px); font-weight: 900; line-height: 1.18; letter-spacing: .01em; text-wrap: balance; }
.hero-lead { margin: 0; max-width: 31em; font-size: clamp(15px, 1.3vw, 18px); line-height: 2; color: rgba(43,58,74,.75); }
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; pointer-events: auto; }
.hero-hint { font-size: 11px; letter-spacing: .16em; color: rgba(43,58,74,.4); font-family: Inter, sans-serif; font-weight: 600; }

/* ---------- marquee ---------- */
.marquee { overflow: hidden; border-top: 1px solid rgba(43,58,74,.12); border-bottom: 1px solid rgba(43,58,74,.12); padding: 14px 0; background: var(--cream-2); }
.marquee-track { display: flex; gap: 0; width: max-content; animation: bkmarquee 26s linear infinite; }
.marquee-row { display: flex; align-items: baseline; gap: 48px; padding-right: 48px; font-family: Inter, 'Zen Kaku Gothic New', sans-serif; font-weight: 700; font-size: 15px; letter-spacing: .18em; color: rgba(43,58,74,.45); white-space: nowrap; }
.mq-dot { color: var(--ak); }

/* ---------- promises ---------- */
.promise-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 20px; }
.promise-card {
  background: #fff; border: 1px solid rgba(43,58,74,.1); border-radius: 14px;
  padding: 38px 32px; display: flex; flex-direction: column; gap: 16px;
  transition: transform .3s, box-shadow .3s;
}
.promise-card:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(43,58,74,.1); }
.promise-num { font-family: Inter, sans-serif; font-weight: 700; font-size: 14px; color: var(--ak); }
.promise-card h3 { margin: 0; font-size: 21px; font-weight: 700; }
.promise-card p { margin: 0; font-size: 14.5px; line-height: 1.95; color: rgba(43,58,74,.7); }

/* ---------- products ---------- */
.product-list { display: flex; flex-direction: column; }
.product-row {
  display: grid; grid-template-columns: clamp(34px, 6vw, 64px) 1fr; gap: clamp(14px, 3vw, 24px); align-items: baseline;
  padding: 30px 12px; border-top: 1px solid rgba(43,58,74,.16);
  transition: background .25s;
}
.product-row:last-child { border-bottom: 1px solid rgba(43,58,74,.16); }
.product-row:hover { background: rgba(255,255,255,.7); }
.product-num { font-family: Inter, sans-serif; font-weight: 700; font-size: 13px; color: rgba(43,58,74,.4); }
.product-body { display: flex; flex-direction: column; gap: 6px; }
.product-title { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.product-name { font-size: 20px; font-weight: 700; }
.product-en { font-family: Inter, sans-serif; font-size: 12px; font-weight: 600; letter-spacing: .1em; color: rgba(43,58,74,.45); }
.product-body p { margin: 0; font-size: 14px; line-height: 1.9; color: rgba(43,58,74,.68); }
.badge { font-size: 11.5px; font-weight: 700; border-radius: 999px; padding: 4px 12px; white-space: nowrap; border: 1px solid; }
.badge-dev { color: var(--ak); border-color: var(--ak); }
.badge-pilot { color: var(--green); border-color: var(--green); }
.badge-soon { color: rgba(43,58,74,.55); border-color: rgba(43,58,74,.3); }
.product-note { margin: 0; font-size: 13.5px; color: rgba(43,58,74,.55); line-height: 1.9; }

/* ---------- ai chat ---------- */
.deco-ring { position: absolute; right: -8vw; top: -30%; width: min(34vw, 480px); aspect-ratio: 1; border-radius: 50%; border: 1.5px solid rgba(250,246,240,.14); }
.ai-intro { gap: 26px; }
.ai-lead { margin: 0; font-size: 15px; line-height: 2; color: rgba(250,246,240,.7); max-width: 30em; }
.chip-list { display: flex; flex-direction: column; gap: 10px; }
.chip {
  align-self: flex-start; background: transparent;
  border: 1px solid rgba(250,246,240,.25); color: rgba(250,246,240,.85);
  padding: 10px 18px; border-radius: 999px; font-size: 13px; font-family: inherit; cursor: pointer;
  transition: border-color .25s, color .25s;
}
.chip:hover { border-color: var(--ak); color: #fff; }

.chat-panel { background: var(--cream); color: var(--ink); border-radius: 18px; overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.35); display: flex; flex-direction: column; }
.chat-head { display: flex; align-items: center; gap: 10px; padding: 16px 22px; border-bottom: 1px solid rgba(43,58,74,.12); background: #fff; }
.chat-title { font-weight: 700; font-size: 14px; white-space: nowrap; }
.chat-beta { font-family: Inter, sans-serif; font-size: 10px; font-weight: 700; letter-spacing: .14em; color: rgba(43,58,74,.45); border: 1px solid rgba(43,58,74,.2); border-radius: 999px; padding: 2px 8px; }
.chat-log { display: flex; flex-direction: column; gap: 12px; height: 360px; overflow-y: auto; padding: 22px; }
.chat-msg { max-width: 82%; padding: 12px 16px; font-size: 13.5px; line-height: 1.85; white-space: pre-wrap; }
.chat-msg.assistant { align-self: flex-start; background: #fff; color: var(--ink); border-radius: 14px 14px 14px 4px; }
.chat-msg.user { align-self: flex-end; background: var(--ink); color: var(--cream); border-radius: 14px 14px 4px 14px; }
.chat-typing { align-self: flex-start; background: #fff; border: 1px solid rgba(43,58,74,.1); border-radius: 14px 14px 14px 4px; padding: 14px 18px; display: flex; gap: 5px; }
.chat-typing span { width: 6px; height: 6px; border-radius: 50%; background: var(--ak); animation: bkdot 1.2s ease-in-out infinite; }
.chat-typing span:nth-child(2) { animation-delay: .15s; }
.chat-typing span:nth-child(3) { animation-delay: .3s; }
.chat-form { display: flex; gap: 10px; padding: 16px; border-top: 1px solid rgba(43,58,74,.12); background: #fff; }
.chat-form input {
  flex: 1; min-width: 0; border: 1px solid rgba(43,58,74,.18); border-radius: 999px;
  padding: 12px 20px; font-size: 14px; font-family: inherit; background: var(--cream); outline: none;
}
.chat-form input:focus { border-color: var(--ak); }
.btn-send { padding: 12px 26px; font-size: 14px; transition: transform .2s; }
.btn-send:hover { transform: translateY(-1px); box-shadow: none; }

/* ---------- company ---------- */
.company-block { gap: 28px; }
.company-table { display: flex; flex-direction: column; }
.company-row { display: grid; grid-template-columns: clamp(84px, 20vw, 110px) 1fr; gap: clamp(12px, 3vw, 20px); padding: 18px 0; border-top: 1px solid rgba(43,58,74,.14); font-size: 14.5px; }
.company-row:last-child { border-bottom: 1px solid rgba(43,58,74,.14); }
.company-key { font-weight: 700; color: rgba(43,58,74,.55); }
.founder-list { display: flex; flex-direction: column; gap: 20px; }
.founder-card { background: #fff; border: 1px solid rgba(43,58,74,.1); border-radius: 14px; padding: 28px 30px; display: flex; flex-direction: column; gap: 8px; }
.founder-name { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; font-size: 19px; font-weight: 700; }
.founder-role { font-size: 12.5px; font-weight: 400; color: rgba(43,58,74,.55); }
.founder-card p { margin: 0; font-size: 14px; line-height: 1.9; color: rgba(43,58,74,.7); }

/* ---------- contact ---------- */
.contact { padding-top: clamp(80px, 11vw, 140px); padding-bottom: clamp(80px, 11vw, 140px); }
.deco-circle { position: absolute; left: -10vw; bottom: -40%; width: min(40vw, 560px); aspect-ratio: 1; border-radius: 50%; background: var(--ak); opacity: .9; }
.contact-intro { gap: 32px; }
.contact-h2 { font-size: clamp(34px, 4.2vw, 58px); text-wrap: balance; }
.contact-lead { margin: 0; font-size: 15px; line-height: 2; color: rgba(250,246,240,.72); max-width: 30em; }
.contact-mail {
  color: var(--cream); text-decoration: none; font-family: Inter, sans-serif; font-weight: 700; font-size: 17px;
  border-bottom: 2px solid var(--ak); align-self: flex-start; padding-bottom: 4px; transition: color .25s;
}
.contact-mail:hover { color: var(--ak); }
.contact-panel { background: var(--cream); color: var(--ink); border-radius: 18px; padding: clamp(22px, 4vw, 36px); box-shadow: 0 30px 80px rgba(0,0,0,.35); }
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 18px; }
.contact-form label { display: flex; flex-direction: column; gap: 8px; font-size: 12.5px; font-weight: 700; color: rgba(43,58,74,.6); }
.label-text { white-space: nowrap; }
.req { color: var(--ak); }
.contact-form input, .contact-form textarea {
  border: 1px solid rgba(43,58,74,.18); border-radius: 10px; padding: 13px 16px;
  font-size: 14px; font-family: inherit; font-weight: 400; background: #fff; outline: none;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--ak); }
.contact-form textarea { resize: vertical; }
.btn-lg { padding: 16px 34px; font-size: 15px; }
.form-note { margin: 0; font-size: 11.5px; color: rgba(43,58,74,.45); line-height: 1.7; }
.contact-done { display: flex; flex-direction: column; gap: 16px; align-items: center; justify-content: center; min-height: 380px; text-align: center; }
.contact-done[hidden] { display: none; }
.done-check { width: 56px; height: 56px; border-radius: 50%; background: var(--green); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 26px; font-weight: 900; }
.done-title { font-size: 19px; font-weight: 700; }
.contact-done p { margin: 0; font-size: 14px; line-height: 1.9; color: rgba(43,58,74,.65); }

/* ---------- footer ---------- */
.footer { background: var(--ink); color: rgba(250,246,240,.6); padding: 34px 5vw; border-top: 1px solid rgba(250,246,240,.12); }
.footer-inner { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; flex-wrap: wrap; font-size: 12.5px; }
.footer-brand { display: flex; align-items: baseline; gap: 10px; }
.footer-logo { font-family: Inter, sans-serif; font-weight: 800; font-size: 16px; color: var(--cream); }
.footer-kana { letter-spacing: .14em; }
.footer-tag { color: rgba(250,246,240,.4); }

/* ---------- reveal ---------- */
.rv-init { opacity: 0; transform: translateY(26px); }
.rv-anim { transition: opacity .85s cubic-bezier(.2,.6,.2,1), transform .85s cubic-bezier(.2,.6,.2,1); }
.rv-in { opacity: 1; transform: none; }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .marquee-track { animation: none; }
  .rv-init { opacity: 1; transform: none; }
}