:root {
  --bg:        #080c17;
  --bg2:       #0d1526;
  --bg3:       #1a2540;
  --bg4:       #2a3a5c;
  --primary:   #6366f1;
  --secondary: #8b5cf6;
  --cyan:      #06b6d4;
  --green:     #10b981;
  --amber:     #f59e0b;
  --danger:    #ef4444;
  --text:      #f0f4ff;
  --muted:     #94a3b8;
  --dark:      #64748b;
  --border:    rgba(255,255,255,0.07);
  --border-hi: rgba(99,102,241,0.3);
  --glow:      0 0 40px rgba(99,102,241,0.15);

  --grad:      linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --grad-warm: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
}

/* Light mode */
@media (prefers-color-scheme: light) {
  :root {
    --bg:#f0f2ff; --bg2:#fff; --bg3:#eef1ff; --bg4:#e0e5f8;
    --border:rgba(0,0,0,0.07); --border-hi:rgba(99,102,241,0.25);
    --text:#0a0c1a; --muted:#4a5578; --dark:#8892a4;
    --glow:0 0 40px rgba(99,102,241,0.08);
  }
}
:root[data-theme="dark"] {
  --bg:#080c17; --bg2:#0d1526; --bg3:#1a2540; --bg4:#2a3a5c;
  --border:rgba(255,255,255,0.07); --border-hi:rgba(99,102,241,0.3);
  --text:#f0f4ff; --muted:#94a3b8; --dark:#64748b;
}
:root[data-theme="light"] {
  --bg:#f0f2ff; --bg2:#fff; --bg3:#eef1ff; --bg4:#e0e5f8;
  --border:rgba(0,0,0,0.07); --border-hi:rgba(99,102,241,0.25);
  --text:#0a0c1a; --muted:#4a5578; --dark:#8892a4;
}

a{color:var(--primary);text-decoration:none}

/* ── Utility ──────────────────────────────── */
.wrap{max-width:100%;margin:0 auto;padding:0 28px}
.wrap-wide{max-width:100%;margin:0 auto;padding:0 28px}
.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.grad-text-warm{
  background:var(--grad-warm);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}

/* ── HERO ─────────────────────────────────── */
.hero{
  padding:20px 0 30px;
  background:radial-gradient(ellipse 80% 60% at 60% 40%, rgba(99,102,241,.07), transparent),
             radial-gradient(ellipse 50% 50% at 10% 90%, rgba(6,182,212,.04), transparent);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:repeating-linear-gradient(
    0deg, transparent, transparent 79px,
    rgba(255,255,255,.018) 79px, rgba(255,255,255,.018) 80px
  ),
  repeating-linear-gradient(
    90deg, transparent, transparent 79px,
    rgba(255,255,255,.018) 79px, rgba(255,255,255,.018) 80px
  );
  pointer-events:none;
}
.hero-inner{
  display:grid;grid-template-columns:1fr 420px;gap:36px;align-items:center;
}
.hero-eye{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--primary);
  margin-bottom:18px;display:flex;align-items:center;gap:10px;
}
.hero-eye::before{
  content:'';display:block;width:24px;height:1px;background:var(--primary);
}
.hero-kicker{
  font-size:.8rem;color:var(--muted);margin-bottom:10px;
  font-family:var(--mono);
}
.hero-title {font-size:32px;letter-spacing: -1px;line-height: 42px !important;}
.hero-lead{
  font-size:1.05rem;color:var(--muted);line-height:1.75;
  max-width:480px;margin-bottom:36px;
}
.hero-chips{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:38px}
.chip{
  font-size:.72rem;font-family:var(--mono);
  padding:4px 11px;border-radius:4px;
  background:var(--bg3);border:1px solid var(--border-hi);color:var(--muted);
}
.chip.on{background:rgba(99,102,241,.1);color:var(--primary)}
.hero-btns{display:flex;gap:10px;flex-wrap:wrap}
.btn-p{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--grad);color:#fff !important;font-weight:700;font-size:.9rem;
  padding:12px 24px;border-radius:8px;border:none;cursor:pointer;
  font-family:var(--sans);transition:opacity .15s;
}
.btn-p:hover{opacity:.85}
.btn-g{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;color:var(--muted);font-weight:500;font-size:.9rem;
  padding:12px 24px;border-radius:8px;
  border:1px solid var(--border-hi);transition:all .15s;
  font-family:var(--sans);
}
.btn-g:hover{border-color:rgba(99,102,241,.5);color:var(--text)}

/* ── Slide Stack (hero visual) ─────────────── */
.slide-stack{position:relative;width:420px;height:300px;perspective:1000px}

.scard{
  position:absolute;
  width:380px;
  aspect-ratio:16/9;
  border-radius:10px;
  overflow:hidden;
  box-shadow:0 20px 60px rgba(0,0,0,.5);
  border:1px solid var(--border-hi);
  transition:transform .4s ease, opacity .4s ease;
}
.scard-3{
  top:24px;left:50%;transform:translateX(-50%) rotate(-4deg) scale(.88);
  background:var(--bg3);
  z-index:1;opacity:.55;
}
.scard-2{
  top:12px;left:50%;transform:translateX(-50%) rotate(-1.5deg) scale(.94);
  background:var(--bg2);
  z-index:2;opacity:.75;
}
.scard-1{
  top:0;left:50%;transform:translateX(-50%) rotate(0deg) scale(1);
  background:var(--bg2);
  z-index:3;opacity:1;
}
.slide-stack:hover .scard-3{transform:translateX(-50%) rotate(-7deg) scale(.86) translateY(10px);opacity:.6}
.slide-stack:hover .scard-2{transform:translateX(-50%) rotate(-3deg) scale(.92) translateY(5px);opacity:.8}

/* Card 1 — 커버 슬라이드 */
.sc1-bg{
  position:absolute;inset:0;
  background:linear-gradient(135deg, #0d1526 0%, #1a2540 100%);
}
.sc1-glow{
  position:absolute;top:-30%;left:60%;width:200px;height:200px;
  background:radial-gradient(circle, rgba(99,102,241,.35) 0%, transparent 70%);
}
.sc1-title{
  position:absolute;bottom:28%;left:8%;
  font-size:.9rem;font-weight:900;letter-spacing:-.04em;color:#f0f4ff;line-height:1.1;
}
.sc1-sub{position:absolute;bottom:18%;left:8%;font-size:.45rem;color:#94a3b8;font-family:var(--mono);letter-spacing:.05em}
.sc1-bar{
  position:absolute;bottom:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg, #6366f1, #8b5cf6, #06b6d4);
}
.sc1-badge{
  position:absolute;top:8%;right:6%;
  width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg, #6366f1, #8b5cf6);
  display:grid;place-items:center;font-size:.55rem;color:#fff;font-weight:900;
}
/* Card 2 — 데이터 슬라이드 */
.sc2-bg{position:absolute;inset:0;background:#0d1526}
.sc2-chart{
  position:absolute;bottom:25%;left:8%;right:8%;
  height:40%;display:flex;align-items:flex-end;gap:5%;
}
.sc2-bar{border-radius:3px 3px 0 0;flex:1}
.sc2-title{position:absolute;top:12%;left:8%;font-size:.52rem;font-weight:700;color:#f0f4ff}
.sc2-legend{position:absolute;top:22%;left:8%;display:flex;gap:6px}
.sc2-dot{width:5px;height:5px;border-radius:50%;display:inline-block}
.sc2-lt{font-size:.35rem;color:#94a3b8;margin-left:2px}
/* Card 3 — 텍스트 슬라이드 */
.sc3-bg{position:absolute;inset:0;background:#1a2540}
.sc3-lines{position:absolute;top:20%;left:8%;right:8%;display:flex;flex-direction:column;gap:8px}
.sc3-line{height:6px;border-radius:3px;background:rgba(255,255,255,.1)}

/* ── Article body ─────────────────────────── */
.article{padding:80px 0}
.section+.section{margin-top:80px}

/* Chapter marker */
.chapter{
  display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:.65rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--dark);margin-bottom:14px;
}
.chapter::before{
  content:'';flex:0 0 32px;height:1px;background:var(--primary);
}
.chapter-n{color:var(--primary)}

/* Section headings */
.article h2{
  font-size:clamp(1.5rem,3.5vw,2.2rem);font-weight:800;
  letter-spacing:-.05em;line-height:1.12;text-wrap:balance;margin-bottom:16px;
}
.article h3{
  font-size:1.15rem;font-weight:700;letter-spacing:-.03em;
  margin-top:32px;margin-bottom:10px;color:var(--text);
}
.article p{font-size:.97rem;color:var(--muted);margin-bottom:14px;line-height:1.8}
.article p strong{color:var(--text);font-weight:600}

/* Pull quote */
.pullquote{
  margin:40px 0;padding:28px 32px;
  border-left:3px solid var(--primary);
  background:var(--bg2);border-radius:0 10px 10px 0;
  font-size:1.1rem;font-weight:600;color:var(--text);
  line-height:1.6;letter-spacing:-.02em;
  position:relative;
}
.pullquote::before{
  content:'❝';position:absolute;top:-8px;left:20px;
  font-size:2rem;color:var(--primary);opacity:.3;line-height:1;
}

/* Comparison table */
.comp-table{
  width:100%;border-collapse:collapse;margin:28px 0;
  font-size:.85rem;
}
.comp-table th{
  background:var(--bg3);color:var(--text);font-weight:700;
  padding:10px 14px;text-align:left;font-size:.78rem;letter-spacing:.03em;
}
.comp-table th:first-child{border-radius:8px 0 0 0}
.comp-table th:last-child{border-radius:0 8px 0 0}
.comp-table td{
  padding:10px 14px;border-bottom:1px solid var(--border);
  color:var(--muted);
}
.comp-table tr:hover td{background:rgba(255,255,255,.02)}
.comp-table .hi{color:var(--primary);font-weight:600}
.comp-table .x{color:var(--danger)}
.comp-table .o{color:var(--green)}

/* Feature grid */
.fgrid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:1px;
  background:var(--border);border:1px solid var(--border);border-radius:10px;
  overflow:hidden;margin:28px 0;
}
.fg-card{
  background:var(--bg2);padding:22px 20px;
  border-left:2px solid transparent;transition:all .15s;
}
.fg-card:hover{background:var(--bg3);border-left-color:var(--primary)}
.fg-icon{font-size:1.2rem !important;margin-bottom:10px}
.fg-card h4{font-size:1rem !important;font-weight:700;letter-spacing:-.02em;margin-bottom:6px}
.fg-card p{font-size:.9rem !important;color:var(--muted);line-height:1.55}

/* Output mode cards */
.mode-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}
.mode-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:10px;
  padding:20px 16px;text-align:center;transition:all .15s;position:relative;overflow:hidden;
}
.mode-card::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:2px;
}
.mode-card.m1::after{background:var(--grad)}
.mode-card.m2::after{background:var(--grad-warm)}
.mode-card.m3::after{background:linear-gradient(90deg,#10b981,#06b6d4)}
.mode-card:hover{border-color:var(--border-hi);transform:translateY(-2px)}
.mode-icon{font-size:1.5rem;margin-bottom:10px}
.mode-label{font-size:.9rem;font-family:var(--mono);color:var(--dark);margin-bottom:6px;letter-spacing:.04em}
.mode-name{font-size:1rem;font-weight:700;letter-spacing:-.03em}
.mode-desc{font-size:.9rem;color:var(--muted);margin-top:5px;line-height:1.5}

/* Animation preview */
.anim-demo{
  background:var(--bg2);border:1px solid var(--border);border-radius:10px;
  overflow:hidden;margin:24px 0;
}
.anim-header{
  background:var(--bg3);border-bottom:1px solid var(--border);
  padding:10px 16px;display:flex;align-items:center;gap:8px;
  font-size:.9rem;font-family:var(--mono);color:var(--muted);
}
.anim-dot{width:8px;height:8px;border-radius:50%;background:var(--primary);animation:pulse-dot 2s ease infinite}
.anim-body{padding:20px;display:flex;flex-direction:column;gap:8px}
.anim-row{
  display:flex;align-items:center;gap:12px;
  padding:8px 12px;background:var(--bg3);border-radius:6px;
  font-size:1rem;
}
.anim-name{font-family:var(--mono);color:var(--primary);min-width:130px;font-size:.75rem}
.anim-bar{flex:1;height:4px;background:var(--border);border-radius:2px;overflow:hidden;position:relative}
.anim-fill{
  position:absolute;left:-100%;top:0;bottom:0;
  border-radius:2px;background:var(--grad);
  animation:slide-bar 2.5s ease infinite;
}
.anim-row:nth-child(2) .anim-fill{animation-delay:.3s}
.anim-row:nth-child(3) .anim-fill{animation-delay:.6s}
.anim-row:nth-child(4) .anim-fill{animation-delay:.9s}
.anim-row:nth-child(5) .anim-fill{animation-delay:1.2s}
.anim-desc{font-size:.9rem;color:var(--muted);min-width:120px;text-align:right}

/* Tech stack */
.stack-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:20px 0;
}
.stack-item{
  background:var(--bg2);border:1px solid var(--border);border-radius:8px;
  padding:14px 12px;text-align:center;
}
.stack-name{font-size:.8rem;font-weight:700;color:var(--text);letter-spacing:-.02em}
.stack-role{font-size:.65rem;color:var(--muted);margin-top:3px;font-family:var(--mono)}

/* Target table */
.target-table{
  width:100%;font-size:.82rem;border-collapse:collapse;margin:20px 0;
}
.target-table th{
  background:var(--bg3);color:var(--muted);font-weight:600;font-size:.72rem;
  padding:8px 12px;text-align:left;letter-spacing:.03em;
}
.target-table td{
  padding:10px 12px;border-bottom:1px solid var(--border);color:var(--muted);
}
.target-table td:first-child{color:var(--text);font-weight:600}
.target-table tr:hover td{background:rgba(255,255,255,.02)}

/* Stat callouts */
.stat-row{display:flex;gap:16px;margin:24px 0;flex-wrap:wrap}
.stat-box{
  flex:1;min-width:120px;
  background:var(--bg2);border:1px solid var(--border);border-radius:10px;
  padding:18px 16px;text-align:center;
}
.stat-val{
  font-size:2rem;font-weight:900;font-family:var(--mono);
  letter-spacing:-.06em;font-variant-numeric:tabular-nums;
  background:var(--grad);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.stat-lbl{font-size:.7rem;color:var(--muted);margin-top:4px;font-family:var(--mono)}

/* ── Divider ──────────────────────────────── */
.divider{
  border:none;border-top:1px solid var(--border);
  margin:60px 0;position:relative;
}
.divider::after{
  content:'✦';position:absolute;top:50%;left:50%;
  transform:translate(-50%,-50%);
  background:var(--bg);padding:0 14px;
  font-size:.65rem;color:var(--dark);
}

/* ── CTA ──────────────────────────────────── */
.cta-section{
  padding:80px 0 100px;
  background:radial-gradient(ellipse 60% 60% at 50% 50%, rgba(99,102,241,.06), transparent);
  text-align:center;border-top:1px solid var(--border);
}
.cta-label{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--primary);margin-bottom:16px;
}
.cta-section h2{
  font-size:clamp(1.8rem,4vw,3rem);font-weight:900;
  letter-spacing:-.06em;line-height:1.08;text-wrap:balance;
  margin-bottom:18px;
}
.cta-section p{font-size:1rem;color:var(--muted);margin-bottom:36px;max-width:440px;margin-left:auto;margin-right:auto;line-height:1.7}
.cta-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ── Footer ──────────────────────────────── */
footer{
  border-top:1px solid var(--border);padding:28px 28px;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
  font-size:.75rem;color:var(--dark);
}
.ft-logo{
  font-weight:800;letter-spacing:-.05em;
  background:var(--grad);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}

/* ── Keyframes ────────────────────────────── */
@keyframes pulse-dot{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}
@keyframes slide-bar{0%{left:-100%}60%,100%{left:100%}}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.au{animation:fadeUp .55s ease both}
.d1{animation-delay:.08s}.d2{animation-delay:.16s}.d3{animation-delay:.24s}

@media (prefers-reduced-motion:reduce){
  .au,.anim-fill,.anim-dot,.scard{animation:none!important;transition:none!important}
}

/* ── Responsive ───────────────────────────── */
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .slide-stack{width:100%;height:220px}
  .scard{width:90%;max-width:340px}
  .mode-cards{grid-template-columns:1fr}
  .fgrid{grid-template-columns:1fr}
  .stack-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px){
  .wrap{padding:0 18px}
  h1.hero-title{font-size:2.2rem}
  .stat-row{gap:10px}
  .stat-val{font-size:1.6rem}
  .topbar{padding:0 18px}
}