/* ============================================================
   NationA — Corporate Site (Prototype)
   Design system: dark, cinematic, premium. EN default + KO toggle.
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.css');

/* ---------- Tokens ---------- */
:root{
  --bg:        #08080b;
  --bg-soft:   #0e0e13;
  --surface:   #131319;
  --surface-2: #1a1a22;
  --line:      rgba(255,255,255,.09);
  --line-strong: rgba(255,255,255,.16);

  --text:      #f6f6f8;
  --text-soft: #c4c4cf;
  --muted:     #8a8a96;

  --brand:     #7c5cff;   /* NationA violet */
  --brand-2:   #a78bff;

  /* product accents */
  --glaze-a:   #b14dff;
  --glaze-b:   #ff4d9d;
  --neuroid-a: #34e3ff;
  --neuroid-b: #4d7cff;

  --grad-glaze:   linear-gradient(135deg,#b14dff 0%,#ff4d9d 100%);
  --grad-neuroid: linear-gradient(135deg,#34e3ff 0%,#4d7cff 100%);
  --grad-brand:   linear-gradient(135deg,#7c5cff 0%,#ff4d9d 100%);

  --maxw: 1200px;
  --radius: 16px;
  --radius-lg: 24px;

  --ease: cubic-bezier(.22,.61,.36,1);
  --font: 'Inter','Pretendard',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}

/* ---------- Reset ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  font-feature-settings:"cv02","cv03","cv04","ss01";
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
:lang(ko){--font:'Pretendard','Inter',sans-serif}
html[lang="ko"] body{font-family:'Pretendard','Inter',sans-serif;word-break:keep-all}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}
::selection{background:var(--brand);color:#fff}

/* ---------- Layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
section{position:relative}
section[id]{scroll-margin-top:92px}
.sec{padding:136px 0}
.sec-sm{padding:92px 0}
@media(max-width:760px){.wrap{padding:0 20px}.sec{padding:84px 0}.sec-sm{padding:60px 0}}
/* one section ≈ one screen: each section fills the viewport, content centered (desktop/tablet) */
@media(min-width:761px){.sec,.sec-sm{min-height:100vh;display:flex;flex-direction:column;justify-content:center}}

.eyebrow{
  font-size:12.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;
  color:var(--brand-2);margin-bottom:22px;display:inline-block;
}
h1,h2,h3{line-height:1.08;letter-spacing:-.025em;font-weight:800}
h1{font-size:clamp(44px,7.4vw,90px);font-weight:900;letter-spacing:-.042em;line-height:1.04}
h2{font-size:clamp(31px,4.4vw,54px);line-height:1.1}
h3{font-size:clamp(20px,2.3vw,27px);letter-spacing:-.015em;line-height:1.22}
.lead{font-size:clamp(17px,1.5vw,20px);line-height:1.62;color:var(--text-soft);max-width:60ch}
.muted{color:var(--muted)}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}

.grad-text{background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.grad-glaze{background:var(--grad-glaze);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.grad-neuroid{background:var(--grad-neuroid);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:15px 28px;border-radius:999px;font-weight:600;font-size:15.5px;letter-spacing:-.01em;
  transition:transform .25s var(--ease),background .25s,border-color .25s,opacity .25s;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:#fff;color:#000}
.btn-primary:hover{background:#fff;opacity:.9}
.btn-grad{background:var(--grad-brand);color:#fff}
.btn-ghost{border:1px solid var(--line-strong);color:var(--text)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.04)}
.btn-lg{padding:17px 34px;font-size:16.5px}
.btn .arr{transition:transform .25s var(--ease)}
.btn:hover .arr{transform:translateX(4px)}

/* ---------- Header ---------- */
.hdr{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .3s,border-color .3s,backdrop-filter .3s;
  border-bottom:1px solid transparent;
}
.hdr.scrolled{
  background:rgba(8,8,11,.72);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.hdr-in{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:-.02em}
.logo .dot{width:9px;height:9px;border-radius:50%;background:var(--grad-brand)}
.nav{display:flex;align-items:center;gap:34px}
.nav a{font-size:15px;color:var(--text-soft);transition:color .2s;font-weight:500}
.nav a:hover,.nav a.active{color:var(--text)}
.hdr-right{display:flex;align-items:center;gap:16px}

/* language toggle */
.lang{display:inline-flex;border:1px solid var(--line-strong);border-radius:999px;overflow:hidden}
.lang button{padding:6px 13px;font-size:12.5px;font-weight:600;color:var(--muted);transition:.2s}
.lang button.on{background:#fff;color:#000}

.burger{display:none;flex-direction:column;gap:5px;padding:8px}
.burger span{width:22px;height:2px;background:#fff;border-radius:2px;transition:.3s}

@media(max-width:920px){
  .nav,.hdr-right .btn{display:none}
  .burger{display:flex}
  .mobile-nav{
    position:fixed;inset:72px 0 auto 0;background:rgba(8,8,11,.97);backdrop-filter:blur(16px);
    border-bottom:1px solid var(--line);padding:18px 24px 28px;
    display:none;flex-direction:column;gap:4px;z-index:99;
  }
  .mobile-nav.open{display:flex}
  .mobile-nav a{padding:13px 4px;font-size:17px;border-bottom:1px solid var(--line);color:var(--text-soft)}
  .mobile-nav .btn{margin-top:14px}
}
@media(min-width:921px){.mobile-nav{display:none}}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding-top:72px}
.hero-bg{position:absolute;inset:0;z-index:0}
.aurora{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;animation:float 18s var(--ease) infinite alternate}
.aurora.a{width:620px;height:620px;background:radial-gradient(circle,#7c5cff,transparent 70%);top:-160px;left:-120px}
.aurora.b{width:560px;height:560px;background:radial-gradient(circle,#ff4d9d,transparent 70%);top:40px;right:-140px;animation-delay:-6s}
.aurora.c{width:520px;height:520px;background:radial-gradient(circle,#34e3ff,transparent 70%);bottom:-180px;left:30%;animation-delay:-11s;opacity:.32}
@keyframes float{0%{transform:translate(0,0) scale(1)}100%{transform:translate(40px,-30px) scale(1.14)}}
.grain{position:absolute;inset:0;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,#000 30%,transparent 75%);opacity:.5}
.hero-in{position:relative;z-index:2;width:100%}
.hero h1{margin:24px 0 30px;max-width:15ch}
.hero .lead{font-size:clamp(18px,1.7vw,22px);line-height:1.55;max-width:54ch;margin-bottom:44px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.scroll-hint{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);z-index:2;color:var(--muted);font-size:12px;letter-spacing:.2em;text-transform:uppercase;display:flex;flex-direction:column;align-items:center;gap:8px}
.scroll-hint .ln{width:1px;height:42px;background:linear-gradient(var(--muted),transparent);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:1}}

/* ---------- Proof bar ---------- */
.proof{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:38px 0;background:var(--bg-soft)}
.proof-lbl{text-align:center;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:24px}
.proof-row{display:flex;flex-wrap:nowrap;justify-content:center;align-items:center;gap:clamp(14px,2.2vw,38px);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.proof-row::-webkit-scrollbar{display:none}
.proof-row span{flex:none;white-space:nowrap;font-weight:700;font-size:clamp(13px,1.5vw,18px);color:var(--text-soft);opacity:.8;transition:opacity .2s,color .2s;letter-spacing:-.01em}
.proof-row span:hover{opacity:1;color:#fff}

/* ---------- Generic blocks ---------- */
.kicker-h{max-width:820px}
.kicker-h h2{margin:0 0 22px}

.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:920px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:34px;transition:border-color .3s,transform .3s var(--ease),background .3s;
}
.card:hover{border-color:var(--line-strong);transform:translateY(-4px)}
.card h3{margin-bottom:13px}
.card p{color:var(--text-soft);font-size:15.5px;line-height:1.6}
.card .num{font-size:13px;font-weight:700;color:var(--muted);margin-bottom:18px;letter-spacing:.04em}

/* stat */
.stat .v{font-size:clamp(36px,4.8vw,58px);font-weight:900;letter-spacing:-.045em;line-height:1;white-space:nowrap}
.stat .l{color:var(--muted);font-size:14.5px;margin-top:14px;line-height:1.45}

/* product split */
.psplit{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:860px){.psplit{grid-template-columns:1fr}}
.pcard{position:relative;border-radius:var(--radius-lg);padding:42px;overflow:hidden;border:1px solid var(--line);min-height:340px;display:flex;flex-direction:column;justify-content:flex-end;transition:transform .35s var(--ease)}
.pcard:hover{transform:translateY(-6px)}
.pcard .glow{position:absolute;inset:0;z-index:0;opacity:.22;transition:opacity .35s}
.pcard:hover .glow{opacity:.34}
.pcard.glaze .glow{background:radial-gradient(120% 90% at 80% 0%,#ff4d9d,transparent 60%),radial-gradient(100% 80% at 0% 100%,#b14dff,transparent 55%)}
.pcard.neuroid .glow{background:radial-gradient(120% 90% at 80% 0%,#34e3ff,transparent 60%),radial-gradient(100% 80% at 0% 100%,#4d7cff,transparent 55%)}
.pcard>*{position:relative;z-index:1}
.pcard .tag{font-size:12.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:auto;opacity:.9}
.pcard h3{font-size:clamp(24px,3vw,34px);margin:22px 0 10px}
.pcard p{color:var(--text-soft);margin-bottom:22px;max-width:42ch}
.pcard .lnk{font-weight:600;display:inline-flex;align-items:center;gap:8px}
.pcard .lnk .arr{transition:transform .25s var(--ease)}
.pcard:hover .lnk .arr{transform:translateX(5px)}

/* flywheel / steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
@media(max-width:860px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px}
.step::before{counter-increment:s;content:"0" counter(s);font-weight:900;font-size:30px;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;display:block;margin-bottom:14px}
.step h3{font-size:19px;margin-bottom:8px}
.step p{color:var(--text-soft);font-size:14.5px}

/* timeline */
.tl{position:relative;border-left:2px solid var(--line);margin-left:8px;padding-left:30px;display:flex;flex-direction:column;gap:34px}
.tl-item{position:relative}
.tl-item::before{content:"";position:absolute;left:-39px;top:5px;width:14px;height:14px;border-radius:50%;background:var(--bg);border:2px solid var(--brand)}
.tl-yr{font-weight:900;font-size:22px;letter-spacing:-.02em;margin-bottom:8px}
.tl-item p{color:var(--text-soft);font-size:15px}

/* contrast table (stateful) */
.vs{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.vs>div{padding:30px}
.vs .old{background:var(--surface);border-right:1px solid var(--line)}
.vs .new{background:linear-gradient(160deg,rgba(124,92,255,.1),rgba(255,77,157,.06))}
.vs h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:18px}
.vs .new h4{color:var(--brand-2)}
.vs ul li{padding:9px 0;color:var(--text-soft);font-size:15px;border-bottom:1px solid var(--line)}
.vs ul li:last-child{border:0}
@media(max-width:620px){.vs{grid-template-columns:1fr}.vs .old{border-right:0;border-bottom:1px solid var(--line)}}

/* value chips */
.vlist{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:760px){.vlist{grid-template-columns:1fr}}
.vrow{display:flex;gap:18px;align-items:flex-start;padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .3s}
.vrow:hover{border-color:var(--line-strong)}
.vrow .n{font-weight:900;font-size:18px;color:var(--brand-2);min-width:28px}
.vrow h4{font-size:17px;margin-bottom:4px}
.vrow p{color:var(--muted);font-size:14px}

/* CTA band */
.cta-band{text-align:center;padding:110px 0;position:relative;overflow:hidden}
.cta-band .glow{position:absolute;inset:0;background:radial-gradient(ellipse 60% 80% at 50% 100%,rgba(124,92,255,.22),transparent 70%);z-index:0}
.cta-band>*{position:relative;z-index:1}
.cta-band h2{margin-bottom:26px}
.cta-band .hero-cta{justify-content:center}

/* roles */
.role{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 28px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);transition:.3s;flex-wrap:wrap}
.role:hover{border-color:var(--line-strong);background:var(--surface-2)}
.role h4{font-size:18px}
.role .meta{color:var(--muted);font-size:14px;margin-top:3px}

/* footer */
.ftr{border-top:1px solid var(--line);padding:70px 0 40px;background:var(--bg-soft)}
.ftr-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;margin-bottom:50px}
@media(max-width:860px){.ftr-top{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.ftr-top{grid-template-columns:1fr}}
.ftr-brand .logo{margin-bottom:16px}
.ftr-brand p{color:var(--muted);font-size:14px;max-width:34ch}
.ftr-col h5{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.ftr-col a{display:block;padding:6px 0;color:var(--text-soft);font-size:14.5px;transition:color .2s}
.ftr-col a:hover{color:#fff}
.ftr-btm{border-top:1px solid var(--line);padding-top:26px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:13px}

/* reveal animation */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .aurora,.scroll-hint .ln{animation:none}
  html{scroll-behavior:auto}
}

/* page hero (sub pages) */
.phero{min-height:100vh;display:flex;align-items:center;padding:96px 0 48px;position:relative;overflow:hidden}
.phero .aurora{opacity:.34}
.phero .eyebrow{margin-bottom:14px}
.phero h1{font-size:clamp(36px,6vw,72px);max-width:18ch}
.phero .lead{margin-top:22px}
.phero .hero-cta{margin-top:36px}
.tag-line{font-weight:600;color:var(--text-soft)}

/* small util */
.mt8{margin-top:8px}.mt16{margin-top:16px}.mt24{margin-top:24px}.mt40{margin-top:40px}
.mb0{margin-bottom:0}
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.note{font-size:13px;color:var(--muted);border-left:2px solid var(--line-strong);padding-left:14px}
.badge{display:inline-block;padding:5px 12px;border:1px solid var(--line-strong);border-radius:999px;font-size:12.5px;color:var(--text-soft);margin:4px 6px 4px 0}