/* ===== Tokens ===== */
:root{
  --ink:#070806;
  --surface:#12140F;
  --surface-2:#1B1E17;
  --line:#2A2E24;
  --paper:#ECE9DF;
  --paper-dim:#DAD6C8;
  --ink-on-paper:#15170F;
  --text:#E9ECE3;
  --text-dim:#9AA192;
  --green:#49E06D;
  --green-deep:#1B7A3E;
  --green-glow:rgba(73,224,109,.35);

  --font-display:'PretendardVariable','Pretendard',system-ui,-apple-system,sans-serif;
  --font-tech:'Oswald',sans-serif;

  --wrap:1180px;
  --pad:clamp(20px,5vw,72px);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font:inherit;cursor:pointer;background:none;border:none;color:inherit}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}
.wrap--narrow{max-width:640px}

:focus-visible{outline:2px solid var(--green);outline-offset:3px}

/* ===== Type helpers ===== */
.eyebrow{
  font-family:var(--font-tech);
  font-size:13px;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--green-deep);
  margin-bottom:18px;
}
.eyebrow--light{color:var(--green)}
.eyebrow--sm{margin-top:80px}

.section-title{
  font-size:clamp(28px,4vw,44px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.25;
  color:var(--ink-on-paper);
  margin-bottom:48px;
}
.section-title--light{color:var(--text)}

.accent{color:var(--green)}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:16px 30px;
  font-size:15px;font-weight:600;
  border-radius:2px;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
  border:1px solid transparent;
  white-space:nowrap;
}
.btn--primary{background:var(--green);color:#07110A;}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px var(--green-glow)}
.btn--ghost{border-color:rgba(233,236,227,.35);color:var(--text)}
.btn--ghost:hover{border-color:var(--green);color:var(--green)}
.btn--block{width:100%}

/* ===== Nav ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(7,8,6,.72);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(233,236,227,.08);
}
.nav__inner{
  max-width:var(--wrap);margin:0 auto;padding:0 var(--pad);
  height:72px;display:flex;align-items:center;justify-content:space-between;
}
.nav__logo{height:34px;width:auto}
.nav__links{display:flex;align-items:center;gap:36px;font-size:14px;font-weight:500}
.nav__links a{color:var(--text-dim);transition:color .2s}
.nav__links a:hover{color:var(--text)}
.nav__cta{
  color:var(--green) !important;
  border:1px solid var(--green-deep);
  padding:9px 18px;border-radius:2px;
}
.nav__cta:hover{background:var(--green);color:#07110A !important}
.nav__burger{display:none;flex-direction:column;gap:5px;width:26px}
.nav__burger span{display:block;height:2px;background:var(--text);transition:transform .25s, opacity .25s}
.nav__mobile{display:none}

@media(max-width:860px){
  .nav__links{display:none}
  .nav__burger{display:flex}
  .nav__mobile{
    position:fixed;top:72px;left:0;right:0;
    background:var(--ink);border-bottom:1px solid var(--line);
    flex-direction:column;padding:12px var(--pad) 24px;gap:4px;
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:transform .25s ease,opacity .25s ease;
  }
  .nav__mobile.open{display:flex;transform:translateY(0);opacity:1;pointer-events:auto}
  .nav__mobile a{padding:14px 0;border-bottom:1px solid var(--line);color:var(--text-dim);font-size:15px}
  .nav__mobile .nav__cta{border:none;color:var(--green)!important;padding:14px 0}
}

/* ===== Signature cable spine ===== */
.spine{
  position:fixed;top:0;left:28px;bottom:0;width:2px;z-index:5;
  display:none;
}
@media(min-width:1240px){.spine{display:block}}
.spine__track{position:relative;height:100%;background:rgba(233,236,227,.08)}
.spine__fill{
  position:absolute;top:0;left:0;width:100%;height:100%;
  background:linear-gradient(180deg,var(--green),var(--green-deep));
  transform:scaleY(0);transform-origin:top;
  box-shadow:0 0 14px var(--green-glow);
}
.spine-node{
  position:absolute;left:-5px;width:12px;height:12px;border-radius:50%;
  background:var(--surface-2);border:2px solid rgba(233,236,227,.25);
  transition:background .3s,border-color .3s,box-shadow .3s;
}
.spine-node.active{background:var(--green);border-color:var(--green);box-shadow:0 0 12px var(--green-glow)}

/* ===== Reveal on scroll ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ===== Hero ===== */
.hero{
  position:relative;min-height:100svh;display:flex;flex-direction:column;
  justify-content:center;overflow:hidden;padding-top:96px;
}
.hero__ambient{
  position:absolute;inset:0;
  background:
    radial-gradient(620px 620px at 80% 20%, var(--green-glow), transparent 68%),
    radial-gradient(900px 500px at 6% 100%, rgba(73,224,109,.07), transparent 70%),
    repeating-linear-gradient(0deg, rgba(233,236,227,.035) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(233,236,227,.035) 0 1px, transparent 1px 64px);
}
.hero__wrap{
  position:relative;display:grid;grid-template-columns:1fr 1fr;
  gap:48px;align-items:center;padding-top:24px;padding-bottom:24px;
}
.hero__content{max-width:560px}
.hero__title{
  font-size:clamp(34px,5.2vw,56px);
  font-weight:800;letter-spacing:-.02em;line-height:1.18;
  margin-bottom:26px;
}
.hero__sub{font-size:clamp(15px,2vw,18px);color:var(--text-dim);max-width:520px;margin-bottom:32px}
.hero__actions{display:flex;justify-content:flex-end;gap:16px;flex-wrap:wrap}

.hero__photo{height:min(70vh,620px);display:flex;align-items:center;justify-content:center}
.hero__photo img{
  height:100%;width:auto;max-width:100%;object-fit:contain;
  border-radius:12px;box-shadow:0 30px 70px rgba(0,0,0,.45);
}

@media(max-width:900px){
  .hero__wrap{grid-template-columns:1fr;text-align:left}
  .hero__photo{order:-1;height:auto;width:100%;margin-bottom:8px}
  .hero__photo img{height:auto;width:100%}
  .hero__actions{justify-content:center}
}
.br-desktop{display:inline}
@media(max-width:560px){.br-desktop{display:none}}


/* ===== Problem ===== */
.problem{background:var(--paper);color:var(--ink-on-paper);padding:120px 0}
.problem__layout{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:stretch}
.problem__photo{position:relative;overflow:hidden;background:#000;min-height:440px}
.problem__photo img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.problem__photo-caption{
  position:absolute;left:0;right:0;bottom:0;padding:24px 26px;
  background:linear-gradient(0deg,rgba(5,6,4,.88),transparent);
  color:var(--text);font-size:14.5px;font-weight:500;
}
.problem__cards{display:flex;flex-direction:column;gap:2px;background:var(--paper-dim)}
.p-card{background:var(--paper);padding:32px 32px;flex:1;display:flex;flex-direction:column;justify-content:center}
.p-card__icon{width:36px;height:36px;color:var(--green-deep);margin-bottom:16px}
.p-card h3{font-size:19px;font-weight:800;margin-bottom:8px}
.p-card p{color:#4B4F42;font-size:14.5px}
@media(max-width:860px){
  .problem__layout{grid-template-columns:1fr}
  .problem__photo{min-height:320px}
}

/* ===== Product ===== */
.product{background:var(--ink);padding:120px 0}
.product__grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.prod-card{background:var(--surface);border:1px solid var(--line)}
.prod-card__media{padding:0;display:flex;align-items:center;justify-content:center;min-height:340px;background:#fff;overflow:hidden}
.prod-card__media img{max-height:400px;object-fit:contain;padding:24px}
.prod-card__media--pad img{max-height:360px}
.prod-card__media--photo{background:#0b0c0a}
.prod-card__media--photo img{width:100%;height:100%;max-height:none;object-fit:cover;padding:0}
.prod-card__body{padding:32px 32px 40px}
.tag{font-family:var(--font-tech);font-size:12px;letter-spacing:.18em;color:var(--green)}
.prod-card__body h3{font-size:24px;font-weight:800;margin:12px 0 14px}
.prod-card__body p{color:var(--text-dim);font-size:15px;margin-bottom:22px}
.check-list li{
  position:relative;padding-left:24px;margin-bottom:12px;font-size:14px;color:var(--text);
}
.check-list li::before{
  content:'';position:absolute;left:0;top:6px;width:12px;height:12px;
  background:var(--green);clip-path:polygon(14% 44%,0 65%,50% 100%,100% 16%,80% 0,45% 62%);
}
@media(max-width:860px){.product__grid{grid-template-columns:1fr}}

/* ===== Anatomy ===== */
.anatomy{background:var(--paper);color:var(--ink-on-paper);padding:120px 0}
.anatomy__grid{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}
.anatomy__media{background:#fff;border:1px solid var(--paper-dim)}
.anatomy__list li{display:flex;gap:18px;padding:18px 0;border-bottom:1px solid var(--paper-dim)}
.anatomy__list li:last-child{border-bottom:none}
.anatomy__list .num{font-family:var(--font-tech);color:var(--green-deep);font-weight:600;font-size:14px;padding-top:2px}
.anatomy__list strong{display:block;font-size:16px;margin-bottom:4px}
.anatomy__list p{font-size:14px;color:#5A5E4F}
.sleeve-sizes{margin-top:28px}
.sleeve-sizes__label{font-size:13px;color:#5A5E4F;margin-bottom:12px}
.sleeve-sizes__chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{
  display:flex;flex-direction:column;gap:2px;
  padding:10px 16px;background:var(--ink-on-paper);color:var(--paper);
  font-family:var(--font-tech);font-size:14px;font-weight:600;border-radius:2px;
}
.chip em{font-style:normal;font-size:11px;color:var(--green);font-family:var(--font-display)}
@media(max-width:860px){.anatomy__grid{grid-template-columns:1fr}}

/* ===== Steps ===== */
.steps{background:var(--surface);padding:120px 0}
.steps__photo{
  margin-top:8px;border-radius:12px;overflow:hidden;background:#000;
  display:flex;align-items:center;justify-content:center;
}
.steps__photo img{width:100%;height:auto;max-height:70vh;object-fit:contain;display:block}

/* ===== Specs ===== */
.specs{background:var(--paper);color:var(--ink-on-paper);padding:80px 0}
.specs__sheet{background:#fff;border:1px solid var(--paper-dim)}
.specs__sheet img{width:100%;height:auto;display:block}

/* ===== Contact ===== */
.contact{background:var(--ink);padding:120px 0 0;text-align:center}
.contact .eyebrow,.contact .section-title{text-align:center}
.contact__sub{color:var(--text-dim);margin-bottom:48px;font-size:15px}
.contact__form{display:flex;flex-direction:column;gap:18px;text-align:left}
.field label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:8px}
.field input,.field textarea{
  width:100%;padding:14px 16px;background:var(--surface);
  border:1px solid var(--line);color:var(--text);border-radius:2px;font:inherit;font-size:15px;
  transition:border-color .2s;
}
.field input:focus,.field textarea:focus{border-color:var(--green)}
.field textarea{resize:vertical}
.contact__note{text-align:center;font-size:14px;color:var(--green);min-height:20px}

.footer{
  margin-top:100px;padding:32px var(--pad) 40px;border-top:1px solid var(--line);
  display:flex;flex-direction:column;align-items:center;gap:16px;
}
.footer__logo{height:18px;opacity:.8}
.footer p{font-size:12px;color:var(--text-dim)}