/* ================================================
   OTSUMU INC. — Corporate × Awwwards Design System
   ================================================ */

/* ---- Variables ---- */
:root {
  --bg:       #0A0A0A;
  --bg2:      #111111;
  --bg3:      #181818;
  --text:     #F0EFE9;
  --muted:    rgba(240,239,233,0.45);
  --faint:    rgba(240,239,233,0.12);
  --accent:   #C8F135;   /* electric lime — corporate tech accent */
  --accent2:  #ffffff;
  --border:   rgba(255,255,255,0.07);
  --border2:  rgba(255,255,255,0.14);
  --hdr-h:    72px;
  --max-w:    1280px;
  --ease:     cubic-bezier(0.16,1,0.3,1);
  --ease2:    cubic-bezier(0.65,0,0.35,1);
}

/* ---- Reset ---- */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { font-size:16px; scroll-behavior:auto; -webkit-font-smoothing:antialiased; }
body {
  font-family:'Inter','Noto Sans JP',-apple-system,sans-serif;
  background:var(--bg); color:var(--text); line-height:1.65; overflow-x:hidden;
}
body.loading { overflow:hidden; }
a { text-decoration:none; color:inherit; }
button { font-family:inherit; cursor:pointer; border:none; background:none; }
img { max-width:100%; height:auto; display:block; }

/* ---- Noise ---- */
.noise {
  position:fixed; inset:0; pointer-events:none; z-index:9999; opacity:0.03;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:180px;
}

/* ---- Custom Cursor ---- */
#cursor {
  position:fixed; top:0; left:0; width:10px; height:10px;
  background:var(--text); border-radius:50%; pointer-events:none;
  z-index:10000; transform:translate(-50%,-50%);
  transition:width .3s var(--ease), height .3s var(--ease), background .3s;
  mix-blend-mode:difference;
}
#cursor.hovering { width:40px; height:40px; }
@media (hover:none) { #cursor { display:none; } }

/* ---- Preloader ---- */
.preloader {
  position:fixed; inset:0; background:var(--bg); z-index:9998;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:24px;
}
.preloader-logo svg { display:block; }
.preloader-words { display:flex; gap:10px; overflow:hidden; }
.pw {
  font-size:clamp(28px,5vw,44px); font-weight:800; letter-spacing:-0.03em;
  overflow:hidden;
}
.pw span { display:block; transform:translateY(110%); }
.pw:last-child span { color:var(--accent); }
.preloader-bar {
  width:240px; height:1px; background:var(--border);
}
.preloader-fill { height:1px; width:0%; background:var(--accent); transition:width .1s linear; }
.preloader-pct {
  font-size:11px; font-weight:600; letter-spacing:.15em; color:var(--muted);
}

/* ---- Header ---- */
.site-header {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  height:var(--hdr-h);
  border-bottom:1px solid transparent;
  transition:background .4s var(--ease), border-color .4s;
}
.site-header.scrolled {
  background:rgba(10,10,10,.88);
  backdrop-filter:blur(24px); -webkit-backdrop-filter:blur(24px);
  border-bottom-color:var(--border);
}
.hdr-inner {
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
  height:100%; display:flex; align-items:center; justify-content:space-between;
}
.hdr-logo {
  display:flex; align-items:center; gap:10px;
  font-size:17px; font-weight:700; letter-spacing:-0.02em;
}
.hdr-logo svg { flex-shrink:0; }
.hdr-nav {
  display:none; align-items:center; gap:32px;
}
@media(min-width:900px) { .hdr-nav { display:flex; } }
.hdr-nav a {
  font-size:13px; font-weight:500; letter-spacing:.01em;
  color:var(--muted); transition:color .25s;
  position:relative; padding-bottom:2px;
}
.hdr-nav a::after {
  content:''; position:absolute; left:0; bottom:0;
  width:0; height:1px; background:var(--accent);
  transition:width .35s var(--ease);
}
.hdr-nav a:hover { color:var(--text); }
.hdr-nav a:hover::after { width:100%; }
.hdr-cta {
  padding:8px 20px; border:1px solid var(--border2);
  border-radius:100px; color:var(--text) !important;
  transition:background .3s, color .3s !important;
}
.hdr-cta:hover { background:var(--text) !important; color:var(--bg) !important; }
.hdr-burger {
  display:flex; flex-direction:column; gap:5px;
  padding:8px; cursor:pointer;
}
@media(min-width:900px) { .hdr-burger { display:none; } }
.hdr-burger span {
  display:block; width:22px; height:1.5px;
  background:var(--text); transition:transform .35s var(--ease), opacity .35s;
}
.hdr-burger.active span:first-child { transform:translateY(6.5px) rotate(45deg); }
.hdr-burger.active span:last-child  { transform:translateY(-6.5px) rotate(-45deg); }

/* ---- Mobile Menu ---- */
.mobile-menu {
  position:fixed; inset:0; background:var(--bg); z-index:999;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  opacity:0; pointer-events:none;
  transition:opacity .4s var(--ease);
}
.mobile-menu.active { opacity:1; pointer-events:all; }
.mm-nav { display:flex; flex-direction:column; align-items:center; gap:8px; }
.mm-nav a {
  font-size:clamp(32px,8vw,60px); font-weight:800; letter-spacing:-0.03em;
  color:var(--text); opacity:0; transform:translateY(24px);
  transition:opacity .5s var(--ease), transform .5s var(--ease);
}
.mobile-menu.active .mm-nav a {
  opacity:1; transform:translateY(0);
  transition-delay:calc(var(--i) * 80ms + 100ms);
}
.mm-address {
  position:absolute; bottom:40px;
  font-size:11px; color:var(--muted); letter-spacing:.05em;
}

/* ---- Layout helpers ---- */
.container { max-width:var(--max-w); margin:0 auto; padding:0 48px; }
.section { padding:120px 0; }
.sec-rule { border:none; border-top:1px solid var(--border); margin:80px 0; }

/* ---- Section headers ---- */
.sec-tag {
  display:inline-flex; align-items:center; gap:8px;
  font-size:11px; font-weight:600; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent); margin-bottom:20px;
}
.sec-tag::before { content:''; width:20px; height:1px; background:var(--accent); flex-shrink:0; }
.sec-hdr { margin-bottom:72px; }
.sec-title {
  font-size:clamp(36px,5vw,64px); font-weight:800;
  letter-spacing:-0.04em; line-height:1.08; margin-bottom:20px;
}
.sec-title-sm {
  font-size:clamp(28px,4vw,48px); font-weight:800;
  letter-spacing:-0.03em; line-height:1.1;
}
.sec-desc { font-size:16px; color:var(--muted); line-height:1.7; max-width:560px; }
.sec-hdr-row { display:flex; flex-direction:column; margin-bottom:48px; }

/* ---- Fade-up animations ---- */
@keyframes fadeUpAuto {
  to { opacity:1; transform:translateY(0); }
}
.fade-up {
  opacity:0; transform:translateY(32px);
  transition:opacity .7s var(--ease), transform .7s var(--ease);
  /* CSS fallback: reveal after 1.8s in case JS timers are throttled */
  animation: fadeUpAuto 0.7s var(--ease) 1.8s both;
}
.fade-up.visible { opacity:1; transform:translateY(0); animation:none; }

/* Hero fade-up: fire on preloader done */
body:not(.loading) .hero .fade-up {
  opacity:1; transform:translateY(0);
}
body:not(.loading) .hero .fade-up[data-delay="0.5"] { transition-delay:0.5s; }
body:not(.loading) .hero .fade-up[data-delay="0.65"] { transition-delay:0.65s; }
body:not(.loading) .hero .fade-up[data-delay="0.8"] { transition-delay:0.8s; }

/* ================================================
   HERO
   ================================================ */
.hero {
  position:relative; min-height:100svh;
  display:flex; flex-direction:column; justify-content:flex-end;
  padding-bottom:0; overflow:hidden;
}

#hero-canvas {
  position:absolute; inset:0; width:100%; height:100%;
  pointer-events:none; z-index:0;
}

.hero-inner {
  position:relative; z-index:1;
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
  width:100%; padding-top:var(--hdr-h);
  display:flex; flex-direction:column; justify-content:center;
  min-height:calc(100svh - 120px);
}

.hero-tag {
  display:inline-flex; align-items:center; gap:10px;
  font-size:12px; font-weight:500; letter-spacing:.1em;
  color:var(--muted); margin-bottom:40px;
  text-transform:uppercase;
}
.dot {
  width:6px; height:6px; border-radius:50%;
  background:var(--accent); flex-shrink:0;
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity:1; transform:scale(1); }
  50% { opacity:0.5; transform:scale(0.7); }
}

.hero-title {
  font-size:clamp(72px,11vw,160px);
  font-weight:900; letter-spacing:-0.04em; line-height:0.92;
  margin-bottom:64px;
}
.ht-line { display:block; overflow:hidden; }
.ht-word {
  display:block; transform:translateY(110%);
  transition:transform 1s cubic-bezier(0.16,1,0.3,1);
}
/* Reveal when preloader is gone (body.loading removed) */
body:not(.loading) .ht-word { transform:translateY(0); }
body:not(.loading) .ht-line:nth-child(2) .ht-word { transition-delay:130ms; }

/* "Tomorrow." in electric lime */
.ht-line:nth-child(2) .ht-word { color:var(--accent); }

.hero-bottom {
  display:flex; flex-direction:column; gap:32px;
  max-width:540px;
}
@media(min-width:768px) {
  .hero-bottom { flex-direction:row; align-items:center; gap:48px; max-width:none; }
}
.hero-sub {
  font-size:16px; color:var(--muted); line-height:1.7; flex:1;
}
.hero-actions {
  display:flex; align-items:center; gap:16px; flex-shrink:0;
}

/* Buttons */
.btn-fill {
  display:inline-flex; align-items:center; gap:8px;
  padding:14px 28px; background:var(--accent); color:#0A0A0A;
  font-size:13px; font-weight:700; letter-spacing:.01em;
  border-radius:100px; transition:opacity .3s, transform .3s var(--ease), box-shadow .3s;
}
.btn-fill:hover {
  opacity:.9; transform:translateY(-3px);
  box-shadow:0 12px 40px rgba(200,241,53,.35);
}
.btn-arr { font-size:16px; }
.btn-line {
  font-size:13px; font-weight:500; color:var(--muted);
  letter-spacing:.01em; padding-bottom:2px;
  border-bottom:1px solid var(--border2);
  transition:color .3s, border-color .3s;
}
.btn-line:hover { color:var(--text); border-color:var(--text); }

/* Hero Stats */
.hero-stats {
  position:relative; z-index:1;
  max-width:var(--max-w); width:100%; margin:0 auto;
  padding:32px 48px;
  border-top:1px solid var(--border);
  display:flex; align-items:center; gap:48px;
}
.hs-item { display:flex; flex-direction:column; gap:4px; }
.hs-num {
  font-size:clamp(22px,3vw,32px); font-weight:800;
  letter-spacing:-0.04em; line-height:1;
  color:var(--accent);
}
.hs-label { font-size:12px; color:var(--muted); font-weight:400; letter-spacing:.02em; }
.hs-div { width:1px; height:40px; background:var(--border); flex-shrink:0; }

/* Scroll hint */
.scroll-hint {
  position:absolute; bottom:48px; right:48px; z-index:1;
  display:flex; flex-direction:column; align-items:center; gap:12px;
}
.sh-line {
  width:1px; height:60px; background:var(--border);
  transform-origin:top;
  animation:shrink 2.4s var(--ease) infinite;
}
@keyframes shrink {
  0% { transform:scaleY(0); opacity:1; }
  60% { transform:scaleY(1); opacity:1; }
  100% { transform:scaleY(1); opacity:0; }
}
.scroll-hint span {
  font-size:9px; font-weight:600; letter-spacing:.18em; color:var(--muted);
  writing-mode:vertical-rl; text-transform:uppercase;
}

/* ================================================
   MARQUEE
   ================================================ */
.marquee-wrap {
  border-top:1px solid var(--border); border-bottom:1px solid var(--border);
  overflow:hidden; padding:18px 0;
}
.marquee-track { display:flex; }
.marquee-inner {
  display:flex; align-items:center; gap:40px;
  white-space:nowrap; flex-shrink:0;
  animation:marquee 28s linear infinite;
  font-size:12px; font-weight:600; letter-spacing:.12em;
  text-transform:uppercase; color:var(--muted);
}
.msep { color:var(--accent); font-size:10px; }
@keyframes marquee {
  from { transform:translateX(0); }
  to   { transform:translateX(-50%); }
}

/* ================================================
   BUSINESS
   ================================================ */
.biz-section { background:var(--bg); }

/* Large image rows */
.biz-row {
  display:grid; grid-template-columns:1fr 1fr; gap:64px;
  align-items:center;
}
.biz-row-rev { direction:rtl; }
.biz-row-rev > * { direction:ltr; }
@media(max-width:900px) {
  .biz-row { grid-template-columns:1fr; gap:32px; }
  .biz-row-rev { direction:ltr; }
}

.biz-img-wrap {
  border-radius:16px; overflow:hidden;
  aspect-ratio:16/10;
}
.biz-img-wrap img {
  width:100%; height:100%; object-fit:cover;
  transition:transform .8s var(--ease);
}
.biz-img-wrap:hover img { transform:scale(1.04); }

.biz-body { display:flex; flex-direction:column; gap:16px; }
.biz-num {
  font-size:11px; font-weight:700; letter-spacing:.12em;
  color:var(--accent); text-transform:uppercase;
}
.biz-name {
  font-size:clamp(24px,3vw,36px); font-weight:800;
  letter-spacing:-0.03em; line-height:1.1;
}
.biz-desc { font-size:15px; color:var(--muted); line-height:1.75; }
.biz-tags { display:flex; flex-wrap:wrap; gap:8px; }
.biz-tags span {
  font-size:11px; font-weight:600; letter-spacing:.06em;
  padding:5px 12px; border:1px solid var(--border2); border-radius:100px;
  color:var(--muted);
}
.biz-link {
  display:inline-flex; align-items:center; gap:6px;
  font-size:13px; font-weight:600; color:var(--text);
  padding-bottom:2px; border-bottom:1px solid var(--border2);
  transition:border-color .3s, color .3s; width:fit-content;
}
.biz-link:hover { color:var(--accent); border-color:var(--accent); }
.biz-links-row { display:flex; gap:20px; flex-wrap:wrap; }

/* Small 3-up cards */
.biz-grid-3 {
  display:grid; grid-template-columns:repeat(3,1fr); gap:2px;
}
@media(max-width:900px) {
  .biz-grid-3 { grid-template-columns:1fr; gap:2px; }
}
.biz-card {
  background:var(--bg2); border:1px solid var(--border);
  padding:40px 36px; display:flex; flex-direction:column; gap:16px;
  transition:border-color .35s, background .35s;
  position:relative; overflow:hidden;
}
.biz-card::before {
  content:''; position:absolute; inset:0;
  background:radial-gradient(ellipse 80% 60% at var(--mx,50%) var(--my,50%), rgba(200,241,53,.06), transparent 70%);
  opacity:0; transition:opacity .4s;
}
.biz-card:hover { border-color:rgba(200,241,53,.35); }
.biz-card:hover::before { opacity:1; }
.biz-icon {
  width:44px; height:44px; border:1px solid var(--border2); border-radius:10px;
  display:flex; align-items:center; justify-content:center;
  color:var(--text); flex-shrink:0;
}

/* ================================================
   HOW WE WORK
   ================================================ */
.how-section { background:var(--bg2); }
.steps-list { display:flex; flex-direction:column; }
.step-row {
  display:grid; grid-template-columns:80px 1fr;
  gap:40px; padding:48px 0;
  border-bottom:1px solid var(--border);
  align-items:start;
}
.step-row:last-child { border-bottom:none; }
@media(max-width:768px) {
  .step-row { grid-template-columns:60px 1fr; gap:24px; }
}
.step-left { display:flex; flex-direction:column; align-items:center; gap:0; }
.step-num {
  font-size:11px; font-weight:700; letter-spacing:.12em;
  color:var(--accent); padding-top:4px;
}
.step-connector {
  width:1px; flex:1; min-height:48px; background:var(--border);
  margin-top:16px;
}
.step-content { display:flex; flex-direction:column; gap:12px; }
.step-content h3 {
  font-size:20px; font-weight:700; letter-spacing:-0.02em;
}
.step-content p { font-size:14px; color:var(--muted); line-height:1.75; }

/* ================================================
   PHILOSOPHY
   ================================================ */
.philosophy-section { background:var(--bg); }
.philosophy-inner {
  display:grid; grid-template-columns:1fr 1fr; gap:80px; align-items:start;
}
@media(max-width:900px) { .philosophy-inner { grid-template-columns:1fr; gap:48px; } }
.phil-quote {
  font-size:clamp(22px,3vw,34px); font-weight:700;
  letter-spacing:-0.03em; line-height:1.4; color:var(--text);
  padding-left:24px; border-left:2px solid var(--accent);
}
.phil-values { display:flex; flex-direction:column; gap:0; }
.pv-item {
  padding:28px 0; border-bottom:1px solid var(--border);
  display:flex; flex-direction:column; gap:8px;
}
.pv-item:last-child { border-bottom:none; }
.pv-n { font-size:10px; font-weight:700; letter-spacing:.12em; color:var(--accent); }
.pv-item h4 { font-size:16px; font-weight:700; letter-spacing:-0.01em; }
.pv-item p  { font-size:13px; color:var(--muted); line-height:1.65; }

/* ================================================
   ACCELERATION
   ================================================ */
.accel-section { background:var(--bg2); }
.accel-logos {
  display:flex; flex-wrap:wrap; gap:24px;
}
.accel-logo-item {
  flex:1; min-width:280px; padding:40px;
  background:var(--bg3); border:1px solid var(--border); border-radius:16px;
  display:flex; flex-direction:column; gap:20px;
  align-items:flex-start;
  transition:border-color .35s, transform .35s var(--ease), box-shadow .35s;
}
.accel-logo-item:hover {
  border-color:rgba(200,241,53,.35);
  transform:translateY(-4px);
  box-shadow:0 16px 48px rgba(0,0,0,.4);
}
.accel-logo-item img {
  height:60px; width:auto; object-fit:contain;
  filter:brightness(0.9);
}
.accel-logo-item span {
  font-size:13px; color:var(--muted); line-height:1.6;
}

/* ================================================
   NEWS
   ================================================ */
.news-section { background:var(--bg); }
.news-list { display:flex; flex-direction:column; }
.news-item {
  display:grid; grid-template-columns:180px 1fr 40px;
  gap:24px; padding:28px 0;
  border-bottom:1px solid var(--border);
  align-items:center;
  transition:background .3s, padding-left .3s var(--ease);
  position:relative;
}
.news-item::before {
  content:''; position:absolute; left:0; top:0; bottom:0;
  width:2px; background:var(--accent);
  transform:scaleY(0); transform-origin:bottom;
  transition:transform .35s var(--ease);
}
.news-item:last-child { border-bottom:none; }
.news-item:hover { background:rgba(240,239,233,.025); padding-left:16px; }
.news-item:hover::before { transform:scaleY(1); }
.news-item:hover .news-title { color:var(--accent); }
.news-item:hover .news-arr { transform:translateX(4px); }
@media(max-width:768px) {
  .news-item { grid-template-columns:1fr 32px; }
  .news-meta { display:none; }
}
.news-meta { display:flex; flex-direction:column; gap:6px; }
.news-date { font-size:12px; color:var(--muted); font-weight:500; letter-spacing:.02em; }
.news-cat {
  font-size:10px; font-weight:700; letter-spacing:.1em; text-transform:uppercase;
  color:var(--accent);
}
.news-title {
  font-size:15px; font-weight:600; letter-spacing:-0.01em; line-height:1.5;
  transition:color .3s;
}
.news-arr {
  font-size:18px; color:var(--muted);
  transition:transform .3s var(--ease), color .3s;
}
.news-item:hover .news-arr { color:var(--text); }

/* ================================================
   CONTACT
   ================================================ */
.contact-section { background:var(--bg2); }
.contact-form-wrap {
  margin-top:48px; border-radius:16px; overflow:hidden;
  border:1px solid var(--border);
}

/* ================================================
   FOOTER
   ================================================ */
.site-footer { background:var(--bg); border-top:1px solid var(--border); }
.ftr-inner {
  max-width:var(--max-w); margin:0 auto; padding:72px 48px 48px;
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:48px;
}
@media(max-width:900px) {
  .ftr-inner { grid-template-columns:1fr 1fr; }
}
@media(max-width:580px) {
  .ftr-inner { grid-template-columns:1fr; }
}
.ftr-brand { display:flex; flex-direction:column; gap:16px; }
.ftr-brand p { font-size:13px; color:var(--muted); line-height:1.7; }
.ftr-address { font-size:12px; color:var(--faint); line-height:1.6; }
.ftr-nav-group { display:flex; flex-direction:column; gap:14px; }
.ftr-nav-group h5 {
  font-size:10px; font-weight:700; letter-spacing:.14em; text-transform:uppercase;
  color:var(--muted); margin-bottom:4px;
}
.ftr-nav-group a {
  font-size:13px; color:var(--muted);
  transition:color .25s;
}
.ftr-nav-group a:hover { color:var(--accent); }
.ftr-bottom {
  max-width:var(--max-w); margin:0 auto; padding:20px 48px;
  border-top:1px solid var(--border);
  font-size:12px; color:var(--muted);
}

/* ================================================
   RESPONSIVE
   ================================================ */
@media(max-width:768px) {
  .container { padding:0 24px; }
  .section { padding:80px 0; }
  .hero-inner { padding:0 24px; min-height:calc(100svh - 80px); }
  .hero-stats { padding:24px; gap:28px; }
  .hdr-inner { padding:0 24px; }
  .scroll-hint { display:none; }
  .ftr-inner { padding:48px 24px 32px; }
  .ftr-bottom { padding:16px 24px; }
}