/* ============================================================
   Abovell Inc. — corporate site
   White-base editorial × engineering-drawing details.
   Palette: Abovell Navy #0B2B50 family + one luminous blue.
   ============================================================ */

:root{
  --navy:#0B2B50;
  --navy-deep:#081F3B;
  --navy-night:#061527;
  --ink:#122F55;          /* headings on white */
  --body:#31517A;         /* body text on white */
  --mute:#7288A6;         /* secondary */
  --faint:#9FB0C6;        /* meta */
  --line:#DFE6EF;         /* hairlines on white */
  --line-soft:#EAF0F7;
  --bg:#FFFFFF;
  --bg-alt:#F5F8FB;
  --accent:#3E97FF;
  --en:'Space Grotesk','Zen Kaku Gothic New',sans-serif;
  --jp:'Zen Kaku Gothic New','Hiragino Kaku Gothic ProN','Hiragino Sans',sans-serif;
  --mono:'IBM Plex Mono','Menlo',monospace;
  --wide:1200px;
  --pad:clamp(20px,5vw,56px);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;color-scheme:light}
body{
  font-family:var(--jp);
  color:var(--body);
  background:var(--bg);
  font-size:15.5px;
  line-height:2.1;
  letter-spacing:.02em;
  font-feature-settings:"palt";
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--navy);color:#fff}

.in{max-width:var(--wide);margin-inline:auto;padding-inline:var(--pad)}

/* side rails — faint full-height hairlines, print-margin feel */
.rails{position:fixed;inset:0;pointer-events:none;z-index:0}
.rails::before,.rails::after{
  content:"";position:absolute;top:0;bottom:0;width:1px;background:var(--line-soft);
}
.rails::before{left:max(12px,2.6vw)}
.rails::after{right:max(12px,2.6vw)}
@media (max-width:760px){.rails{display:none}}

main,header,footer{position:relative;z-index:1}

/* ---------- header ---------- */
.hd{
  position:fixed;inset-inline:0;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
  transition:border-color .3s;
}
.hd.sc{border-bottom-color:var(--line)}
.hd-in{
  max-width:var(--wide);margin-inline:auto;padding:0 var(--pad);
  height:64px;display:flex;align-items:center;justify-content:space-between;
}
.brand img{width:152px;height:auto}
.nav{display:flex;gap:clamp(18px,3vw,38px)}
.nav a{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink);display:inline-flex;align-items:baseline;gap:7px;
  padding:6px 0;position:relative;
}
.nav a i{font-style:normal;font-size:9px;color:var(--accent)}
.nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:2px;height:1px;background:var(--navy);
  transition:right .35s cubic-bezier(.7,0,.2,1);
}
.nav a:hover::after{right:0}
@media (max-width:760px){
  .hd-in{height:56px}
  .brand img{width:126px}
  .nav a{display:none}
  .nav a.cta{display:inline-flex}
}

/* ---------- hero ---------- */
.hero{padding-top:64px;min-height:100svh;display:flex;flex-direction:column}
.hero .in{width:100%;flex:1;display:flex;flex-direction:column}
.meta-top{
  display:flex;justify-content:space-between;gap:16px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--faint);
  padding:22px 0 0;
}
.hero-grid{
  flex:1;display:flex;align-items:center;
  padding:clamp(32px,6vh,72px) 0;
}
h1{
  font-family:var(--jp);font-weight:700;color:var(--navy);
  font-size:clamp(41px,6.8vw,86px);
  line-height:1.22;letter-spacing:.03em;
}
h1 em{font-style:normal;color:var(--accent)}
.hero-sub{
  margin-top:clamp(22px,3.4vh,40px);
  font-size:clamp(13.5px,1.4vw,16px);color:var(--mute);letter-spacing:.06em;
}
/* line-mask reveal (on load) */
.hl{display:block;overflow:hidden}
.hl>span{display:inline-block;transform:translateY(112%);transition:transform 1s cubic-bezier(.22,.7,.16,1)}
.h2l>span{transition-delay:.1s}
.h3l>span{transition-delay:.2s}
.h4l>span{transition-delay:.34s}
body.ld .hl>span{transform:none}

.hero-base{border-top:1px solid var(--line)}
.hero .hb-in{
  display:flex;flex-direction:row;justify-content:space-between;align-items:center;gap:16px;
  flex:none;padding-block:16px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--faint);
}
.hb-scroll{color:var(--ink);display:inline-flex;gap:8px;align-items:center}
.hb-scroll i{font-style:normal;color:var(--accent);animation:nudge 2.2s ease-in-out infinite}
@keyframes nudge{0%,100%{transform:translateY(-2px)}50%{transform:translateY(3px)}}

/* ---------- sections ---------- */
.sec{padding-block:clamp(84px,13vh,150px)}
.lbl{
  display:flex;align-items:baseline;gap:14px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.3em;text-transform:uppercase;
  margin-bottom:clamp(44px,7vh,76px);
}
.lbl .no{color:var(--accent)}
.lbl .ttl{color:var(--ink)}
.lbl .rule{flex:1;height:1px;background:var(--line);align-self:center}
.lbl .jp{color:var(--faint);letter-spacing:.42em;font-size:10.5px}
h2{
  font-family:var(--jp);font-weight:700;color:var(--ink);
  font-size:clamp(26px,3.2vw,40px);line-height:1.6;letter-spacing:.05em;
}
.grid2{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(28px,5vw,88px)}
@media (max-width:860px){.grid2{grid-template-columns:1fr;gap:28px}}
.sec p+p{margin-top:1.6em}

/* origin */
.origin .formula{
  margin-block:2.4em;border:1px solid var(--line);background:#fff;
}
.fr{
  display:grid;grid-template-columns:minmax(0,1.1fr) 44px minmax(0,1.3fr);
  align-items:center;padding:18px clamp(16px,2.4vw,28px);
}
.fr+.fr{border-top:1px solid var(--line-soft)}
.fa{font-family:var(--mono);font-size:13px;letter-spacing:.06em;color:var(--mute)}
.fo{font-family:var(--mono);color:var(--accent);text-align:center;font-size:14px}
.fb{font-family:var(--en);font-weight:500;color:var(--navy);font-size:clamp(16px,1.8vw,21px);letter-spacing:.02em;line-height:1.4}
.fb small{display:block;font-family:var(--mono);font-weight:400;font-size:10px;letter-spacing:.26em;text-transform:uppercase;color:var(--faint);margin-top:4px}
@media (max-width:560px){
  .fr{grid-template-columns:minmax(0,1fr) 30px minmax(0,1.2fr);padding-inline:14px}
  .fa{font-size:11.5px}
}

/* business */
.biz{background:var(--bg-alt)}
.biz-head{margin-bottom:clamp(40px,6vh,64px)}
.rows{border-top:1px solid var(--line)}
.row{
  display:grid;grid-template-columns:90px minmax(0,5fr) minmax(0,6fr);
  gap:clamp(16px,3vw,48px);align-items:start;
  padding:clamp(28px,4vh,44px) 0;
  border-bottom:1px solid var(--line);
  position:relative;
}
.row::before{
  content:"";position:absolute;left:0;top:-1px;height:1px;width:0;background:var(--navy);
  transition:width .5s cubic-bezier(.7,0,.2,1);
}
.row:hover::before{width:100%}
.r-no{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--accent);padding-top:10px}
.row h3{
  font-family:var(--jp);font-weight:700;color:var(--ink);
  font-size:clamp(19px,2vw,24px);line-height:1.55;letter-spacing:.04em;
}
.row h3 span{
  display:block;font-family:var(--mono);font-weight:400;font-size:10.5px;
  letter-spacing:.3em;text-transform:uppercase;color:var(--faint);margin-top:8px;
}
.row p{font-size:14.5px;line-height:2.05}
@media (max-width:860px){
  .row{grid-template-columns:52px minmax(0,1fr)}
  .row p{grid-column:2}
}

/* company — dark plate */
.co{background:linear-gradient(180deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff}
.co .lbl .ttl{color:#fff}
.co .lbl .rule{background:rgba(255,255,255,.18)}
.co .lbl .jp{color:rgba(255,255,255,.38)}
.co h2{color:#fff}
.co-grid{align-items:start}
.meta{border-top:1px solid rgba(255,255,255,.16)}
.meta>div{
  display:grid;grid-template-columns:170px minmax(0,1fr);gap:18px;
  padding:20px 0;border-bottom:1px solid rgba(255,255,255,.16);
}
.meta dt{color:rgba(255,255,255,.66);font-size:13px;letter-spacing:.12em}
.meta dt i{
  display:block;font-style:normal;font-family:var(--mono);font-size:9.5px;
  letter-spacing:.26em;text-transform:uppercase;color:rgba(143,180,232,.55);margin-top:4px;
}
.meta dd{font-size:14.5px;line-height:1.95;letter-spacing:.03em}
@media (max-width:560px){.meta>div{grid-template-columns:1fr;gap:4px;padding:16px 0}}

/* contact */
.mail{margin-block:.6em 0}
.mail a{
  font-family:var(--en);font-weight:500;color:var(--navy);
  font-size:clamp(26px,4.6vw,54px);letter-spacing:.01em;line-height:1.2;
  display:inline-flex;align-items:baseline;gap:.18em;
  background:linear-gradient(currentColor,currentColor) left bottom / 100% 1px no-repeat;
  padding-bottom:6px;
  transition:color .3s;
}
.mail a i{font-style:normal;font-size:.45em;color:var(--accent);transition:transform .3s}
.mail a:hover{color:var(--accent)}
.mail a:hover i{transform:translate(3px,-3px)}
.pp{margin-top:clamp(48px,7vh,72px);padding-top:26px;border-top:1px solid var(--line);max-width:620px}
.pp h3{
  font-family:var(--jp);font-weight:700;font-size:13px;color:var(--ink);
  letter-spacing:.14em;margin-bottom:.7em;
}
.pp p{font-size:12.5px;line-height:2;color:var(--mute)}

/* ---------- footer ---------- */
.ft{background:var(--navy-night);color:rgba(255,255,255,.55);padding-block:clamp(40px,6vh,64px) 28px}
.ft-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.12)}
.ft-up{
  width:40px;height:40px;border:1px solid rgba(255,255,255,.24);
  display:inline-flex;align-items:center;justify-content:center;
  color:#fff;font-size:10px;transition:background .3s,border-color .3s;
}
.ft-up:hover{background:var(--accent);border-color:var(--accent)}
.ft-btm{
  display:flex;justify-content:space-between;gap:12px;padding-top:22px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;
}
.ft-dom{color:rgba(255,255,255,.3)}
@media (max-width:560px){.ft-btm{flex-direction:column}}

/* ---------- scroll reveal ---------- */
.rv{opacity:0;transform:translateY(18px);transition:opacity .9s ease,transform .9s cubic-bezier(.22,.7,.16,1)}
.rv.d1{transition-delay:.1s}
.rv.d2{transition-delay:.2s}
.rv.on{opacity:1;transform:none}

/* anchor offset */
section[id]{scroll-margin-top:64px}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hl>span,.rv{transform:none;opacity:1;transition:none}
  .hb-scroll i{animation:none}
}