/* =========================================================
   OTSUKA TRADING CO., LTD. — 株式会社大塚商事
   Light Motion Edition — Building what's next.
   ========================================================= */

:root {
  --bg:      #eef2fb;
  --bg-2:    #e7ecfa;
  --card:    #ffffff;
  --ink:     #141d33;
  --ink-soft:#3c4767;
  --muted:   #5a6788;
  --line:    rgba(20,50,120,.10);
  --line-2:  rgba(20,50,120,.16);

  --c1: #5b7bff;
  --c2: #22a7ff;
  --c3: #14c3a8;
  --c4: #9a7bff;
  --grad: linear-gradient(120deg, var(--c1), var(--c2) 52%, var(--c3));

  --serif:  "Shippori Mincho", "Noto Serif JP", serif;
  --display:"Cormorant Garamond", "Times New Roman", serif;
  --sans:   "Noto Sans JP", system-ui, sans-serif;
  --mono:   "JetBrains Mono", ui-monospace, monospace;

  --maxw: 1180px;
  --gut: clamp(20px, 5vw, 56px);
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-weight: 300;
  line-height: 1.85;
  font-size: 16px;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* =========================================================
   Background motion layers (fixed)
   ========================================================= */
.aurora {
  position: fixed; inset: -30%; z-index: 0; pointer-events: none;
  filter: blur(78px); opacity: .5;
  background:
    radial-gradient(38% 38% at 28% 30%, var(--c1), transparent 60%),
    radial-gradient(36% 36% at 72% 35%, var(--c2), transparent 60%),
    radial-gradient(40% 40% at 58% 72%, var(--c3), transparent 60%),
    radial-gradient(34% 34% at 38% 75%, var(--c4), transparent 60%);
  background-repeat: no-repeat;
  animation: flow 20s ease-in-out infinite;
}
@keyframes flow {
  0%,100% { transform: translate(0,0) rotate(0) scale(1); }
  33%     { transform: translate(4%,-3%) rotate(6deg) scale(1.08); }
  66%     { transform: translate(-3%,4%) rotate(-5deg) scale(1.04); }
}
#fx { position: fixed; inset: 0; z-index: 1; pointer-events: none; }
.spot {
  position: fixed; width: 460px; height: 460px; left: 0; top: 0; z-index: 1;
  pointer-events: none; border-radius: 50%;
  background: radial-gradient(circle, rgba(90,130,255,.16), transparent 66%);
  transform: translate(-50%,-50%);
}
.veil {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: radial-gradient(ellipse at 50% 40%, rgba(238,242,251,.20) 6%, rgba(238,242,251,.62) 58%, var(--bg) 92%);
}

/* keep content above layers */
.header { z-index: 50; }
.hero, .strip, .section, .footer { position: relative; z-index: 2; }

.container {
  width: 100%; max-width: var(--maxw); margin: 0 auto;
  padding: 0 var(--gut); position: relative; z-index: 1;
}

/* =========================================================
   Shared typography
   ========================================================= */
.grad, .en-grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .3em;
  text-transform: uppercase; color: var(--c2);
  display: inline-flex; align-items: center; gap: .8em;
}
.eyebrow::before {
  content: ""; width: 34px; height: 1px; background: var(--c2);
  display: inline-block; animation: line 2.6s ease-in-out infinite;
}
@keyframes line { 0%,100%{width:18px;opacity:.5} 50%{width:44px;opacity:1} }

.section { padding: clamp(76px, 11vw, 150px) 0; }
.section__head { margin-bottom: clamp(40px, 6vw, 72px); }
.section__title {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(28px, 4.6vw, 46px); line-height: 1.32;
  letter-spacing: .04em; margin-top: 20px;
}
.section__title .en {
  display: block; font-family: var(--display); font-style: italic;
  font-weight: 500; font-size: clamp(15px, 2vw, 20px);
  letter-spacing: .06em; color: var(--muted); margin-top: 10px;
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: .7em;
  font-family: var(--sans); font-weight: 700; font-size: 14px;
  letter-spacing: .04em; padding: 15px 30px; border-radius: 30px;
  background: var(--grad); background-size: 200% auto; color: #fff;
  box-shadow: 0 12px 30px rgba(34,167,255,.30);
  transition: transform .25s var(--ease), box-shadow .3s;
  animation: sh 6s linear infinite;
}
.btn::after {
  content: ""; position: absolute; top: 0; left: -60%; width: 40%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,.55), transparent);
  transform: skewX(-20deg); animation: glint 3.6s ease-in-out infinite;
}
.btn svg { transition: transform .3s var(--ease); position: relative; z-index: 1; }
.btn:hover { transform: translateY(-3px); box-shadow: 0 18px 40px rgba(34,167,255,.4); }
.btn:hover svg { transform: translateX(5px); }
.btn--ghost {
  background: transparent; color: var(--ink);
  border: 1px solid var(--line-2); box-shadow: none; animation: none;
}
.btn--ghost::after { display: none; }
.btn--ghost:hover { background: rgba(255,255,255,.6); box-shadow: 0 10px 26px rgba(30,60,140,.1); }
@keyframes glint { 0%{left:-60%} 30%,100%{left:130%} }
@keyframes sh { to { background-position: 200% center; } }

/* =========================================================
   Logo mark (OT monogram — double ring + T)
   ========================================================= */
.mark { width: 40px; height: 40px; flex: none; display: grid; place-items: center; }
.mark svg { width: 100%; height: 100%; display: block; }

/* =========================================================
   Header
   ========================================================= */
.header {
  position: fixed; top: 0; left: 0; right: 0;
  transition: .45s var(--ease); border-bottom: 1px solid transparent;
}
.header.scrolled {
  background: rgba(238,242,251,.72);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.header__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 20px var(--gut);
  display: flex; align-items: center; justify-content: space-between;
  transition: padding .45s var(--ease);
}
.header.scrolled .header__inner { padding-top: 13px; padding-bottom: 13px; }

.brand { display: flex; align-items: center; gap: 13px; }
.brand__name {
  font-family: var(--serif); font-weight: 800;
  font-size: 20px; letter-spacing: .13em; line-height: 1.1;
}
.brand__name small {
  display: block; font-family: var(--mono); font-weight: 400;
  font-size: 9.5px; letter-spacing: .24em; color: var(--muted); margin-top: 4px;
}

.nav { display: flex; align-items: center; gap: 32px; }
.nav__link {
  font-family: var(--mono); font-size: 12px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--muted);
  position: relative; padding: 4px 0; transition: color .3s;
}
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1.5px;
  background: var(--grad); transition: width .35s var(--ease);
}
.nav__link:hover { color: var(--c2); }
.nav__link:hover::after { width: 100%; }
.nav__cta {
  font-family: var(--sans); font-weight: 700; font-size: 12px;
  letter-spacing: .08em; text-transform: uppercase;
  padding: 10px 20px; border-radius: 30px;
  background: var(--grad); background-size: 200% auto; color: #fff;
  box-shadow: 0 8px 20px rgba(34,167,255,.28);
  transition: transform .25s var(--ease); animation: sh 6s linear infinite;
}
.nav__cta:hover { transform: translateY(-2px); }

.nav__toggle { display: none; background: none; border: 0; cursor: pointer; width: 34px; height: 28px; position: relative; }
.nav__toggle span { position: absolute; left: 3px; right: 3px; height: 2px; border-radius: 2px; background: var(--ink); transition: .35s var(--ease); }
.nav__toggle span:nth-child(1) { top: 6px; }
.nav__toggle span:nth-child(2) { top: 13px; }
.nav__toggle span:nth-child(3) { top: 20px; }
.nav__toggle.open span:nth-child(1) { top: 13px; transform: rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { top: 13px; transform: rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  min-height: 100svh; display: flex; align-items: center;
  overflow: hidden; padding: 150px 0 70px;
}
.hero__bg { display: none; }
.hero__corner {
  position: absolute; font-family: var(--mono); font-size: 11px;
  letter-spacing: .2em; color: var(--muted); z-index: 2;
}
.hero__corner--tr { top: 112px; right: var(--gut); }
.hero__corner--br { bottom: 34px; right: var(--gut); display: flex; align-items: center; gap: 8px; }
.hero__corner--br::after { content: ""; width: 1px; height: 30px; background: var(--muted); animation: scroll 1.8s var(--ease) infinite; }
@keyframes scroll { 0%{transform:scaleY(0);transform-origin:top} 45%{transform:scaleY(1);transform-origin:top} 55%{transform:scaleY(1);transform-origin:bottom} 100%{transform:scaleY(0);transform-origin:bottom} }

.hero__content { z-index: 2; }
.hero__meta {
  font-family: var(--mono); font-size: 12px; letter-spacing: .32em;
  text-transform: uppercase; color: var(--c2); margin-bottom: 26px;
  display: inline-flex; align-items: center; gap: 12px;
  opacity: 0; transform: translateY(12px); animation: rise .8s .2s forwards;
}
.hero__meta::before { content: ""; width: 40px; height: 1px; background: var(--c2); }
.hero__title {
  font-family: var(--serif); font-weight: 800;
  font-size: clamp(42px, 8.2vw, 100px); line-height: 1.18; letter-spacing: .03em;
}
.hero__title .l { display: block; overflow: hidden; }
.hero__title .l > span { display: inline-block; transform: translateY(115%); animation: up .95s var(--ease) forwards; }
.hero__title .l:nth-child(1) > span { animation-delay: .35s; }
.hero__title .l:nth-child(2) > span { animation-delay: .48s; }
.hero__title .l:nth-child(3) > span { animation-delay: .61s; }
.hero__title .ch { display: inline-block; transition: transform .3s var(--ease), color .3s; }
.hero__title .ch:hover { transform: translateY(-12px) scale(1.06); color: var(--c2); }
.hero__title em, .shimmer {
  font-style: normal;
  background: linear-gradient(100deg, var(--c1), var(--c2) 32%, var(--c3) 58%, var(--c4) 82%, var(--c1));
  background-size: 220% auto;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: sh 6s linear infinite; white-space: nowrap;
}
.hero__sub {
  margin-top: 32px; max-width: 44ch; color: var(--muted);
  font-size: clamp(15px, 1.6vw, 17px); line-height: 2.15;
  opacity: 0; transform: translateY(12px); animation: rise .9s .9s forwards;
}
.hero__cta { margin-top: 42px; display: flex; gap: 16px; flex-wrap: wrap; opacity: 0; transform: translateY(12px); animation: rise .9s 1.05s forwards; }
@keyframes up { to { transform: translateY(0); } }
@keyframes rise { to { opacity: 1; transform: translateY(0); } }

/* =========================================================
   Marquee strip
   ========================================================= */
.strip {
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  overflow: hidden; padding: 16px 0;
  background: rgba(255,255,255,.35); backdrop-filter: blur(6px);
}
.strip__track { display: flex; gap: 56px; width: max-content; animation: marquee 30s linear infinite; }
.strip__item {
  font-family: var(--display); font-style: italic; font-size: 22px; color: var(--muted);
  display: flex; align-items: center; gap: 56px; white-space: nowrap;
}
.strip__item::after { content: "◦"; color: var(--c2); font-style: normal; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* =========================================================
   About
   ========================================================= */
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 6vw, 88px); align-items: center; }
.about__lead {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(22px, 3vw, 33px); line-height: 1.85; letter-spacing: .04em;
}
.about__lead em {
  font-family: var(--display); font-style: italic; font-weight: 600;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.about__body p { color: var(--ink-soft); margin-bottom: 1.4em; }
.about__body p:last-child { margin-bottom: 0; }
.about__body strong { font-weight: 500; color: var(--c1); }
.about__sign { margin-top: 30px; padding-top: 26px; border-top: 1px solid var(--line); display: flex; align-items: baseline; gap: 14px; }
.about__sign b { font-family: var(--serif); font-weight: 700; font-size: 18px; letter-spacing: .12em; }
.about__sign span { font-family: var(--mono); font-size: 11px; letter-spacing: .18em; color: var(--muted); }

/* =========================================================
   Services — floating white cards
   ========================================================= */
.svc {
  display: grid; grid-template-columns: 130px 1fr auto;
  gap: clamp(20px, 4vw, 52px); align-items: center;
  padding: clamp(30px, 4vw, 44px) clamp(26px, 3.5vw, 44px);
  background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  box-shadow: 0 14px 34px rgba(30,60,140,.08);
  margin-bottom: 18px; position: relative;
  transition: box-shadow .35s, transform .15s var(--ease);
}
.svc:hover { box-shadow: 0 28px 58px rgba(34,120,255,.2); }
.svc__no {
  font-family: var(--display); font-style: italic; font-weight: 600;
  font-size: clamp(48px, 7vw, 84px); line-height: .9;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.svc__no small { display: block; font-family: var(--mono); font-style: normal; font-size: 11px; letter-spacing: .24em; color: var(--muted); margin-top: 10px; -webkit-text-fill-color: var(--muted); }
.svc__title { font-family: var(--serif); font-weight: 700; font-size: clamp(20px, 2.6vw, 27px); letter-spacing: .05em; margin-bottom: 6px; }
.svc__en { font-family: var(--display); font-style: italic; font-size: 17px; color: var(--c2); margin-bottom: 18px; }
.svc__desc { color: var(--ink-soft); max-width: 56ch; font-size: 15px; }
.svc__tags { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.svc__tags span {
  font-family: var(--mono); font-size: 11px; letter-spacing: .06em; color: var(--muted);
  border: 1px solid var(--line-2); padding: 5px 12px; border-radius: 30px;
  transition: .3s var(--ease);
}
.svc:hover .svc__tags span { border-color: rgba(34,167,255,.4); color: var(--ink-soft); }
.svc__arrow { align-self: center; color: var(--muted); transition: .35s var(--ease); }
.svc:hover .svc__arrow { color: var(--c2); transform: translateX(6px); }
.svc--feature { background: linear-gradient(180deg, #ffffff, #f3f7ff); border-color: rgba(34,167,255,.28); }
.svc--feature::before {
  content: "貴社の負担を、補助金で軽く。";
  position: absolute; top: 16px; right: 22px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; color: var(--c2);
}

/* =========================================================
   Process — floating step cards
   ========================================================= */
.process__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 20px; }
.step {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 30px 24px; box-shadow: 0 12px 30px rgba(30,60,140,.07);
  transition: box-shadow .35s, transform .15s var(--ease);
}
.step:hover { box-shadow: 0 24px 50px rgba(34,120,255,.18); }
.step__no { font-family: var(--mono); font-size: 12px; letter-spacing: .2em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.step__title { font-family: var(--serif); font-weight: 700; font-size: 19px; letter-spacing: .04em; margin: 14px 0 12px; }
.step__desc { font-size: 14px; color: var(--ink-soft); line-height: 1.9; }

/* =========================================================
   Company table
   ========================================================= */
.ctable { width: 100%; border-collapse: collapse; margin-top: 12px; background: var(--card); border-radius: 18px; overflow: hidden; box-shadow: 0 14px 34px rgba(30,60,140,.07); }
.ctable th, .ctable td { text-align: left; padding: 22px 26px; border-bottom: 1px solid var(--line); vertical-align: top; }
.ctable tr:last-child th, .ctable tr:last-child td { border-bottom: none; }
.ctable th {
  font-family: var(--mono); font-size: 12px; letter-spacing: .12em; color: var(--muted);
  font-weight: 400; text-transform: uppercase; width: 220px; white-space: nowrap;
  background: rgba(91,123,255,.05);
}
.ctable td { font-size: 15.5px; color: var(--ink); }
.ctable td small { color: var(--muted); font-family: var(--mono); font-size: 12px; letter-spacing: .04em; }
.ctable a:hover { color: var(--c2); }

/* =========================================================
   Contact — light gradient panel
   ========================================================= */
.contact { position: relative; overflow: hidden; }
.contact .container {
  background: linear-gradient(150deg, #ffffff 0%, #eaf1ff 60%, #e4fbf6 100%);
  border: 1px solid var(--line-2); border-radius: 28px;
  padding: clamp(44px, 6vw, 76px) clamp(28px, 5vw, 64px);
  box-shadow: 0 24px 60px rgba(34,120,255,.14); max-width: var(--maxw);
}
.contact__title { font-family: var(--serif); font-weight: 700; font-size: clamp(30px, 5vw, 54px); line-height: 1.4; letter-spacing: .04em; margin: 22px 0 16px; }
.contact__title em { font-family: var(--display); font-style: italic; font-weight: 600; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.contact__lead { color: var(--muted); max-width: 50ch; margin-bottom: 44px; }
.contact__grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(30px, 5vw, 64px); align-items: start; }
.contact__methods { display: grid; gap: 4px; }
.cmethod { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 6px; border-bottom: 1px solid var(--line); transition: .35s var(--ease); }
.cmethod:hover { padding-left: 16px; }
.cmethod__label { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; color: var(--muted); text-transform: uppercase; }
.cmethod__val { font-family: var(--display); font-size: clamp(20px, 2.6vw, 28px); letter-spacing: .02em; color: var(--ink); }
.cmethod__val small { font-family: var(--sans); font-size: 13px; color: var(--muted); letter-spacing: 0; }
.contact__addr { color: var(--muted); margin-bottom: 24px; }
.contact__addr .rec { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; color: var(--muted); }

/* =========================================================
   Footer
   ========================================================= */
.footer { background: var(--bg-2); color: var(--ink-soft); padding: 64px 0 32px; border-top: 1px solid var(--line); }
.footer__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; flex-wrap: wrap; padding-bottom: 40px; border-bottom: 1px solid var(--line); }
.footer .brand__name { color: var(--ink); }
.footer__tag { font-family: var(--display); font-style: italic; font-size: 18px; color: var(--muted); margin-top: 14px; }
.footer__nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer__nav a { font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); transition: color .3s; }
.footer__nav a:hover { color: var(--c2); }
.footer__bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 28px; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--muted); }

/* =========================================================
   Reveal
   ========================================================= */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .aurora, .strip__track, .hero__corner--br::after, .btn, .nav__cta, .hero__title em, .shimmer, .eyebrow::before { animation: none; }
  #fx { display: none; }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 920px) {
  .about__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
  .process__grid { grid-template-columns: repeat(2, 1fr); }
  .svc { grid-template-columns: 90px 1fr; }
  .svc__arrow { display: none; }
  .svc--feature::before { display: none; }
}
@media (max-width: 720px) {
  .nav { position: fixed; inset: 0 0 0 auto; width: min(80vw, 320px);
    background: rgba(238,242,251,.96); backdrop-filter: blur(14px);
    flex-direction: column; align-items: flex-start; justify-content: center;
    gap: 26px; padding: 0 36px; transform: translateX(100%);
    transition: transform .5s var(--ease); box-shadow: -20px 0 60px rgba(30,60,140,.16); z-index: 45; }
  .nav.open { transform: none; }
  .nav__toggle { display: block; z-index: 46; }
  .nav__link { font-size: 16px; }
  .nav__cta { font-size: 14px; }
  .ctable th { width: auto; display: block; padding-bottom: 4px; }
  .ctable td { display: block; padding-top: 4px; padding-bottom: 18px; }
  .process__grid { grid-template-columns: 1fr; }
  .hero__corner--tr { display: none; }
}