/* ==========================================================================
   KUMSONG Trading Co. LTD — core stylesheet
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root{
  --paper:#FAF8F5;
  --surface:#FFFFFF;
  --surface-2:#F2EEE8;
  --ink:#16130F;
  --ink-2:#3B352E;
  --ink-3:#6B6259;
  --line:#E4DED5;
  --line-2:#D3CBC0;
  --accent:#B1231E;
  --accent-dk:#8B1915;
  --accent-tint:#FBEEED;
  --dark:#141110;
  --dark-2:#211C19;
  --dark-line:#332B27;
  --radius:4px;
  --wrap:1240px;
  --gut:clamp(20px,4vw,56px);
  --ff-display:"Archivo","Helvetica Neue",Arial,sans-serif;
  --ff-body:"Inter","Helvetica Neue",Arial,sans-serif;
  --ff-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-family:var(--ff-display);font-weight:700;line-height:1.05;letter-spacing:-.02em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button,input,textarea,select{font:inherit;color:inherit}
::selection{background:var(--accent);color:#fff}

/* ---------- 3. Layout primitives ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.section{padding-block:clamp(64px,8vw,120px)}
.section--tight{padding-block:clamp(48px,6vw,84px)}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* eyebrow with index number */
.eyebrow{
  display:flex;align-items:center;gap:14px;
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--accent);margin-bottom:26px;
}
.eyebrow::before{
  content:"";width:26px;height:1px;background:var(--accent);flex:none;
}
.eyebrow span{color:var(--ink-3)}

/* stripes motif — echoes the sphere in the logo */
.stripes{
  background-image:repeating-linear-gradient(115deg,
    rgba(177,35,30,.16) 0 2px, transparent 2px 11px);
}

/* ---------- 4. Typography scale ---------- */
.display{font-size:clamp(2.4rem,6.4vw,5rem);letter-spacing:-.035em}
.h2{font-size:clamp(1.9rem,3.9vw,3.1rem);letter-spacing:-.03em}
.h3{font-size:clamp(1.15rem,1.6vw,1.4rem);letter-spacing:-.015em;line-height:1.2}
.lead{font-size:clamp(1.02rem,1.35vw,1.2rem);color:var(--ink-2);line-height:1.7}
.muted{color:var(--ink-3)}
.mono{font-family:var(--ff-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase}

/* ---------- 5. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--ff-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  padding:15px 26px;border:1px solid var(--ink);border-radius:2px;
  background:var(--ink);color:#fff;
  transition:background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
  cursor:pointer;
}
.btn .arw{transition:transform .3s var(--ease)}
.btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.btn:hover .arw{transform:translateX(5px)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn--ghost:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.btn--light{background:transparent;color:#fff;border-color:rgba(255,255,255,.32)}
.btn--light:hover{background:var(--accent);border-color:var(--accent)}

.link-u{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--ff-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  border-bottom:1px solid var(--line-2);padding-bottom:4px;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.link-u:hover{color:var(--accent);border-color:var(--accent)}

/* ---------- 6. Header ---------- */
.hdr{
  position:sticky;top:0;z-index:60;
  background:rgba(250,248,245,.9);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--line);
}
.hdr__in{display:flex;align-items:center;justify-content:space-between;gap:24px;height:78px}
.brand{display:flex;align-items:center;flex:none}
.brand img{height:34px;width:auto}
.nav{display:flex;align-items:center;gap:30px;margin-left:auto}
.nav a{
  position:relative;font-family:var(--ff-mono);font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-2);padding-block:6px;
  transition:color .22s var(--ease);
}
.nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--accent);
  transition:right .3s var(--ease);
}
.nav a:hover{color:var(--accent)}
.nav a:hover::after{right:0}
.nav a.is-active{color:var(--ink)}
.nav a.is-active::after{right:0;background:var(--accent)}
.hdr .btn{padding:12px 20px}
.burger{
  display:none;width:44px;height:44px;border:1px solid var(--line-2);background:none;
  border-radius:2px;align-items:center;justify-content:center;cursor:pointer;flex:none;
}
.burger span{display:block;width:18px;height:1.5px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--ink);
  transition:transform .3s var(--ease),top .3s var(--ease);
}
.burger span::before{top:-6px}.burger span::after{top:6px}
body.nav-open .burger span{background:transparent}
body.nav-open .burger span::before{top:0;transform:rotate(45deg)}
body.nav-open .burger span::after{top:0;transform:rotate(-45deg)}

/* ---------- 7. Hero ---------- */
.hero{position:relative;border-bottom:1px solid var(--line);overflow:hidden}
.hero__grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:calc(100%/6) 100%;opacity:.55;
}
.hero__in{position:relative;padding-block:clamp(64px,9vw,130px)}
.hero h1{
  max-width:24ch;font-size:clamp(1.85rem,3.55vw,3.15rem);
  letter-spacing:-.03em;line-height:1.12;
}
.logostrip{display:flex;flex-wrap:wrap;gap:12px}
.logostrip .vtile{flex:1 1 150px;min-width:130px;min-height:104px;padding:18px}
.logostrip .vtile img{max-height:40px}
.quote{
  font-family:var(--ff-display);font-weight:700;letter-spacing:-.025em;line-height:1.15;
  font-size:clamp(1.5rem,2.9vw,2.35rem);
}
.quote em{font-style:normal;color:var(--accent)}
.hero__accent{color:var(--accent)}
.hero__body{
  margin-top:clamp(30px,4vw,48px);display:grid;grid-template-columns:1fr minmax(280px,470px);
  gap:clamp(24px,5vw,70px);align-items:start;
}
.hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero__mark{
  position:absolute;right:calc(var(--gut) * -0.06);top:9%;width:min(33vw,392px);aspect-ratio:1;
  border-radius:50%;border:1px solid var(--line-2);pointer-events:none;overflow:hidden;
  background:repeating-linear-gradient(118deg,
    rgba(177,35,30,.20) 0 2px, transparent 2px 12px);
}
.hero__mark::before,.hero__mark::after{
  content:"";position:absolute;border-radius:50%;border:1px solid var(--line-2);
}
.hero__mark::before{inset:15%}
.hero__mark::after{inset:34%;border-color:rgba(177,35,30,.34)}

/* ticker */
.ticker{
  border-block:1px solid var(--line);background:var(--surface);
  overflow:hidden;padding-block:15px;
}
.ticker__track{display:flex;gap:0;width:max-content;animation:slide 38s linear infinite}
.ticker__track > span{
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--ink-3);padding-inline:26px;display:flex;align-items:center;gap:26px;white-space:nowrap;
}
.ticker__track i{display:block;width:5px;height:5px;background:var(--accent);border-radius:50%;font-style:normal}
@keyframes slide{to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.ticker__track{animation:none}}

/* ---------- 8. Page header (inner pages) ---------- */
.phead{position:relative;border-bottom:1px solid var(--line);overflow:hidden}
.phead__in{padding-block:clamp(52px,7vw,96px);position:relative}
.phead h1{max-width:18ch}
.phead .lead{margin-top:22px;max-width:62ch}
.crumbs{
  display:flex;gap:10px;align-items:center;font-family:var(--ff-mono);font-size:11px;
  letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3);margin-bottom:24px;
}
.crumbs a:hover{color:var(--accent)}
.crumbs em{font-style:normal;color:var(--line-2)}

/* ---------- 9. Split / prose blocks ---------- */
.split{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(28px,6vw,88px)}
.split--top{align-items:start}
.prose > * + *{margin-top:20px}
.prose strong{font-weight:600;color:var(--ink)}
/* brand positioning phrase */
.tp,strong.tp{color:var(--accent);font-weight:600}
.prose p{color:var(--ink-2);font-size:1.02rem;line-height:1.75}

/* ---------- 10. Feature cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.card{
  background:var(--surface);padding:clamp(26px,3vw,40px);
  transition:background .3s var(--ease);position:relative;
}
.card:hover{background:var(--surface-2)}
.card__n{font-family:var(--ff-mono);font-size:11px;letter-spacing:.16em;color:var(--accent);display:block;margin-bottom:26px}
.card h3{margin-bottom:14px}
.card p{color:var(--ink-3);font-size:.96rem}
.card::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent);
  transition:width .35s var(--ease);
}
.card:hover::after{width:100%}

/* ---------- 11. Numbered index list (Solutions) ---------- */
.idx{border-top:1px solid var(--line)}
.idx__row{
  display:grid;grid-template-columns:64px minmax(0,1fr) minmax(0,1.05fr);
  gap:clamp(16px,3vw,40px);align-items:baseline;
  padding-block:clamp(22px,2.6vw,32px);border-bottom:1px solid var(--line);
  transition:background .3s var(--ease),padding-inline .3s var(--ease);
}
.idx__row:hover{background:var(--surface);padding-inline:18px}
.idx__n{font-family:var(--ff-mono);font-size:11px;letter-spacing:.14em;color:var(--accent)}
.idx__t{font-family:var(--ff-display);font-weight:700;font-size:clamp(1.15rem,2vw,1.62rem);letter-spacing:-.02em;line-height:1.15}
.idx__d{color:var(--ink-3);font-size:.97rem}
.idx__row:hover .idx__t{color:var(--accent)}

/* ---------- 12. Vendors grid ---------- */
.vgrid{display:flex;flex-wrap:wrap;gap:14px}
.vtile{
  flex:1 1 168px;min-width:150px;min-height:134px;
  display:flex;align-items:center;justify-content:center;
  background:var(--surface);border:1px solid var(--line);border-radius:8px;
  box-shadow:0 2px 4px rgba(22,19,15,.045),0 8px 20px rgba(22,19,15,.045);
  padding:24px 26px;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.vtile:hover{
  transform:translateY(-4px);
  border-color:var(--line-2);
  box-shadow:0 4px 8px rgba(22,19,15,.06),0 16px 34px rgba(22,19,15,.09);
}
.vtile img{
  max-height:50px;max-width:86%;width:auto;height:auto;object-fit:contain;
}
/* optical balancing for square-ish marks */
.vtile img[alt="HP"]{max-height:56px;max-width:56px}
.vtile img[alt="Sangfor Technologies"]{max-height:62px;max-width:74px}

/* ---------- 13. Legal / compliance prose ---------- */
.legal{display:grid;grid-template-columns:minmax(0,260px) minmax(0,1fr);gap:clamp(28px,6vw,80px);align-items:start}
.toc{position:sticky;top:104px;border-left:1px solid var(--line);padding-left:22px}
.toc p{font-family:var(--ff-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3);margin-bottom:16px}
.toc a{display:block;font-size:.9rem;color:var(--ink-2);padding-block:7px;transition:color .2s var(--ease)}
.toc a:hover{color:var(--accent)}
.legal__body h2{
  font-size:clamp(1.15rem,1.9vw,1.5rem);letter-spacing:-.015em;line-height:1.25;
  margin-top:56px;margin-bottom:18px;padding-top:26px;border-top:1px solid var(--line);
}
.legal__body h2:first-child{margin-top:0;border-top:0;padding-top:0}
.legal__body p{color:var(--ink-2);font-size:1.02rem;line-height:1.78;margin-bottom:16px}
.legal__body ul{margin:18px 0 24px}
.legal__body ul li{
  position:relative;padding-left:22px;color:var(--ink-2);padding-block:5px;
  border-bottom:1px dashed var(--line);
}
.legal__body ul li:last-child{border-bottom:0}
.legal__body ul li::before{
  content:"";position:absolute;left:0;top:15px;width:7px;height:1px;background:var(--accent);
}
.legal__body .note{
  background:var(--surface);border:1px solid var(--line);border-left:2px solid var(--accent);
  padding:20px 24px;margin:22px 0;color:var(--ink-2);font-size:.98rem;
}

/* ---------- 14. Contact ---------- */
.contact{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(30px,6vw,80px);align-items:start}
.info__item{padding-block:24px;border-bottom:1px solid var(--line)}
.info__item:first-child{padding-top:0}
.info__k{font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.info__v{font-size:1.02rem;color:var(--ink-2);line-height:1.6}
.info__v a:hover{color:var(--accent)}

.form{background:var(--surface);border:1px solid var(--line);padding:clamp(26px,3.4vw,44px)}
.form h3{margin-bottom:8px}
.form > p{color:var(--ink-3);font-size:.95rem;margin-bottom:28px}
.field{margin-bottom:22px}
.field label{
  display:block;font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-3);margin-bottom:9px;
}
.field label span{color:var(--accent)}
.field input,.field textarea{
  width:100%;background:transparent;border:0;border-bottom:1px solid var(--line-2);
  padding:11px 2px;font-size:1rem;transition:border-color .25s var(--ease);
}
.field textarea{resize:vertical;min-height:118px}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.form .btn{width:100%;justify-content:center;margin-top:6px}
.form__ok{
  display:none;margin-top:18px;padding:14px 18px;background:var(--accent-tint);
  border-left:2px solid var(--accent);font-size:.94rem;color:var(--ink-2);
}
.form__ok.is-on{display:block}

/* ---------- 15. CTA band ---------- */
.cta{position:relative;background:var(--dark);color:#fff;overflow:hidden}
.cta__stripes{position:absolute;inset:0;opacity:.5;
  background-image:repeating-linear-gradient(115deg,rgba(177,35,30,.5) 0 2px,transparent 2px 13px)}
.cta__in{position:relative;padding-block:clamp(56px,7vw,96px);display:grid;
  grid-template-columns:minmax(0,1fr) auto;gap:34px;align-items:center}
.cta h2{max-width:20ch}
.cta p{color:rgba(255,255,255,.62);margin-top:16px;max-width:52ch}

/* ---------- 16. Footer ---------- */
.ftr{background:var(--dark);color:rgba(255,255,255,.66);border-top:1px solid var(--dark-line)}
.ftr__in{
  display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1fr);
  gap:clamp(32px,5vw,70px);padding-block:clamp(50px,6vw,76px);
}
.ftr__logo img{height:38px;width:auto;margin-bottom:22px}
.ftr__about{font-size:.95rem;line-height:1.7;max-width:44ch;color:rgba(255,255,255,.6)}
.social{display:flex;gap:10px;margin-top:26px}
.social a{
  width:40px;height:40px;border:1px solid var(--dark-line);border-radius:2px;
  display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.7);
  transition:background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.social a:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.social svg{width:17px;height:17px;fill:currentColor}
.ftr h4{
  font-family:var(--ff-mono);font-weight:400;font-size:10.5px;letter-spacing:.2em;
  text-transform:uppercase;color:rgba(255,255,255,.42);margin-bottom:22px;
}
.ftr__nav a{display:block;padding-block:7px;font-size:.95rem;color:rgba(255,255,255,.72);transition:color .22s var(--ease),padding-left .22s var(--ease)}
.ftr__nav a:hover{color:var(--accent);padding-left:6px}
.ftr__bot{
  border-top:1px solid var(--dark-line);padding-block:24px;
  display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;
  font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(255,255,255,.38);
}

/* ---------- 17. Misc ---------- */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.stat{background:var(--surface);padding:clamp(24px,3vw,38px)}
.stat__v{font-family:var(--ff-display);font-weight:700;font-size:clamp(1.7rem,3vw,2.5rem);letter-spacing:-.03em;line-height:1}
.stat__k{font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3);margin-top:12px}

.stub{max-width:60ch}
.stub .note{background:var(--surface);border:1px solid var(--line);border-left:2px solid var(--accent);padding:22px 26px;color:var(--ink-2)}

/* reveal */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* ---------- 18. Responsive ---------- */
@media (max-width:1040px){
  .cards{grid-template-columns:1fr 1fr}
  .legal{grid-template-columns:1fr}
  .toc{position:static;border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:22px;
       display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center}
  .toc p{width:100%;margin-bottom:6px}
}
@media (max-width:900px){
  .hdr__in{height:70px}
  .burger{display:flex}
  .hdr .btn{display:none}
  .nav{
    position:fixed;inset:70px 0 auto 0;background:var(--paper);border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;padding:8px var(--gut) 26px;
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:opacity .28s var(--ease),transform .28s var(--ease);
    max-height:calc(100vh - 70px);overflow:auto;
  }
  body.nav-open .nav{opacity:1;transform:none;pointer-events:auto}
  .nav a{padding-block:15px;border-bottom:1px solid var(--line);font-size:12.5px}
  .split,.contact,.hero__body,.cta__in{grid-template-columns:1fr}
  .cta__in{gap:26px}
  .hero__mark{opacity:.1;top:auto;bottom:-10%}
  .idx__row{grid-template-columns:48px 1fr}
  .idx__d{grid-column:2/-1}
  .ftr__in{grid-template-columns:1fr 1fr}
  .ftr__logo{grid-column:1/-1}
}
@media (max-width:620px){
  .cards,.stats{grid-template-columns:1fr}
  .ftr__in{grid-template-columns:1fr}
  .vtile{flex:1 1 140px;min-width:140px;min-height:110px;padding:18px}
  .vtile img{max-height:42px}
  .hero__grid{background-size:calc(100%/3) 100%}
}