:root{
  --paper:#F4F3FA; --panel:#FFFFFF; --line:#DEDCEC;
  --ink:#14181F; --ink-dim:#5B6472;
  --brass:#4F46E5; --brass-soft:#8B85EF; --brass-tint:rgba(79,70,229,0.08);
  --signal:#2F7A5B; --danger:#B14A3B; --radius:2px;
}
*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{background:var(--paper); color:var(--ink); font-family:'Inter', sans-serif; line-height:1.5; -webkit-font-smoothing:antialiased;}
::selection{background:var(--brass-soft); color:#fff;}
.mono{font-family:'IBM Plex Mono', monospace;}
.serif{font-family:'IBM Plex Serif', serif;}
a{color:inherit;}
.wrap{max-width:1120px; margin:0 auto; padding:0 32px;}
@media(max-width:640px){.wrap{padding:0 20px;}}
.topbar{position:sticky; top:0; z-index:100; background:var(--panel); border-bottom:1px solid var(--line);}
.topbar-inner{display:flex; align-items:center; justify-content:space-between; padding:20px 32px; max-width:1120px; margin:0 auto;}
.brand{display:flex; align-items:center; gap:10px; font-family:'IBM Plex Serif', serif; font-size:19px; font-weight:600; letter-spacing:-0.01em; text-decoration:none; color:var(--ink);}
.brand-icon{flex-shrink:0;}
.nav-links{display:flex; gap:32px; font-size:14.5px; color:var(--ink-dim); font-family:'Inter', sans-serif;}
.nav-links a{text-decoration:none; transition:color .15s; font-weight:500;}
.nav-links a:hover{color:var(--ink);}
.topbar-right{display:flex; align-items:center; gap:18px;}
.lang-toggle{display:flex; border:1px solid var(--line); border-radius:6px; overflow:hidden; font-family:'Inter', sans-serif; font-size:12.5px;}
.lang-toggle a{color:var(--ink-dim); padding:7px 11px; text-decoration:none; font-weight:600; transition:background .15s, color .15s;}
.lang-toggle a.active{background:var(--brass); color:#fff;}
.cta-small{font-family:'Inter', sans-serif; font-size:13.5px; font-weight:600; color:#fff; background:var(--ink); padding:10px 18px; border-radius:6px; text-decoration:none; white-space:nowrap; transition:background .15s;}
.cta-small:hover{background:var(--brass);}
@media(max-width:900px){.nav-links{display:none;}}
@media(max-width:560px){
  .topbar-inner{padding:12px 14px; gap:8px;}
  .brand{font-size:14.5px; gap:6px; white-space:nowrap;}
  .brand-icon{width:18px; height:18px;}
  .topbar-right{gap:8px;}
  .lang-toggle a{padding:5px 8px; font-size:11px;}
  .cta-small{padding:8px 12px; font-size:11px;}
}
@media(max-width:380px){
  .topbar-inner{padding:10px 12px; gap:6px;}
  .brand{font-size:13px;}
  .cta-small{padding:7px 10px; font-size:10.5px;}
  .lang-toggle a{padding:4px 7px; font-size:10.5px;}
}
.hero{padding:96px 0 72px; border-bottom:1px solid var(--line); position:relative; overflow:hidden;}
.hero::before{content:''; 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; opacity:0.55; mask-image:linear-gradient(to bottom, black, transparent 85%);}
.hero-inner{position:relative; z-index:1;}
.eyebrow{font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--brass); letter-spacing:0.08em; text-transform:uppercase; display:flex; align-items:center; gap:10px; margin-bottom:24px;}
.eyebrow::before{content:'//'; opacity:0.5;}
.nowrap{white-space:nowrap;}
h1{font-family:'IBM Plex Serif', serif; font-weight:500; font-size:clamp(34px, 5.4vw, 62px); line-height:1.06; letter-spacing:-0.01em; max-width:820px; color:var(--ink); text-wrap:balance;}
h1 em{font-style:italic; color:var(--brass);}
.hero-sub{max-width:560px; margin-top:26px; font-size:17px; color:var(--ink-dim); line-height:1.6;}
.hero-ctas{display:flex; gap:14px; margin-top:36px; flex-wrap:wrap;}
.btn-primary{background:var(--brass); color:#fff; font-family:'IBM Plex Mono', monospace; font-size:13px; font-weight:600; padding:14px 24px; border-radius:var(--radius); text-decoration:none; letter-spacing:0.02em; transition:background .15s, transform .15s; display:inline-block;}
.btn-primary:hover{background:#3730A3; transform:translateY(-1px);}
.btn-ghost{border:1px solid var(--line); color:var(--ink); font-family:'IBM Plex Mono', monospace; font-size:13px; padding:14px 24px; border-radius:var(--radius); text-decoration:none; transition:border-color .15s, background .15s; display:inline-block; background:var(--panel);}
.btn-ghost:hover{border-color:var(--brass); background:var(--brass-tint);}
.hero-stats{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); margin-top:64px; border:1px solid var(--line);}
.stat{background:var(--panel); padding:22px 24px;}
.stat-num{font-family:'IBM Plex Mono', monospace; font-size:26px; color:var(--brass); font-weight:600;}
.stat-label{font-size:12.5px; color:var(--ink-dim); margin-top:4px;}
@media(max-width:640px){.hero-stats{grid-template-columns:1fr;}}
section{padding:88px 0; border-bottom:1px solid var(--line);}
.section-head{max-width:640px; margin-bottom:52px;}
.section-tag{font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--brass); text-transform:uppercase; letter-spacing:0.08em; margin-bottom:14px; display:block;}
h2{font-family:'IBM Plex Serif', serif; font-weight:500; font-size:clamp(26px, 3.4vw, 38px); line-height:1.15; letter-spacing:-0.01em; color:var(--ink); text-wrap:balance;}
.section-desc{color:var(--ink-dim); font-size:16px; margin-top:16px; line-height:1.65;}
.stack-console{background:var(--panel); border:1px solid var(--line); border-radius:4px; padding:40px; position:relative; overflow:hidden; box-shadow:0 1px 2px rgba(20,24,31,0.04);}
.console-label{font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--ink-dim); display:flex; justify-content:space-between; align-items:center; gap:12px; margin-bottom:32px; padding-bottom:16px; border-bottom:1px dashed var(--line);}
.console-label .live{color:var(--signal); display:flex; align-items:center; gap:6px; white-space:nowrap; flex-shrink:0;}
.console-label .live::before{content:''; width:6px; height:6px; border-radius:50%; background:var(--signal); flex-shrink:0;}
@media(max-width:560px){
  .stack-console{padding:20px;}
  .console-label{font-size:10px;}
}
.stack-grid{display:grid; grid-template-columns:minmax(0,1fr) 130px minmax(0,1fr); gap:0 32px; align-items:center;}
.stack-col{display:flex; flex-direction:column; gap:12px; min-width:0;}
.stack-col.right{align-items:stretch;}
.node{border:1px solid var(--line); background:var(--paper); padding:12px 16px; border-radius:2px; font-family:'IBM Plex Mono', monospace; font-size:12.5px; color:var(--ink-dim); display:flex; align-items:center; gap:10px; transition:border-color .2s, color .2s; width:100%; box-sizing:border-box;}
.stack-col.right .node{justify-content:flex-end; flex-direction:row-reverse;}
.node:hover{border-color:var(--brass); color:var(--ink);}
.node-dot{width:5px; height:5px; border-radius:50%; background:var(--ink-dim); flex-shrink:0;}
.node:hover .node-dot{background:var(--brass);}
.core{width:110px; height:110px; border-radius:50%; border:1px solid var(--brass); background:var(--panel); display:flex; align-items:center; justify-content:center; text-align:center; font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--brass); letter-spacing:0.04em; position:relative; justify-self:center; margin:0 auto;}
.core::before{content:''; position:absolute; inset:-14px; border-radius:50%; border:1px dashed var(--brass-soft); opacity:0.6; animation:spin 24s linear infinite;}
@keyframes spin{to{transform:rotate(360deg);}}
@media(prefers-reduced-motion: reduce){.core::before{animation:none;}}
@media(max-width:760px){.stack-grid{grid-template-columns:1fr; gap:16px;} .stack-col.right{align-items:flex-start;} .stack-col.right .node{justify-content:flex-start; flex-direction:row;} .core{margin:8px auto;}}
.problem-list{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); margin-top:8px;}
.problem-item{background:var(--panel); padding:24px 26px; font-size:14.5px; color:var(--ink-dim); display:flex; gap:12px;}
.problem-item::before{content:'×'; font-family:'IBM Plex Mono', monospace; color:var(--danger); flex-shrink:0;}
@media(max-width:760px){.problem-list{grid-template-columns:1fr;}}

.services-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--line); border:1px solid var(--line);}
.service-card{background:var(--panel); padding:32px;}
.service-title{font-family:'IBM Plex Serif', serif; font-size:19px; color:var(--ink); margin-bottom:10px;}
.service-desc{font-size:14.5px; color:var(--ink-dim); line-height:1.6; margin-bottom:16px;}
.service-tags{display:flex; flex-wrap:wrap; gap:8px;}
.service-tag{font-family:'IBM Plex Mono', monospace; font-size:11.5px; color:var(--brass); border:1px solid var(--line); padding:5px 10px; border-radius:20px; background:var(--brass-tint);}
@media(max-width:700px){.services-grid{grid-template-columns:1fr;}}

.why-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:28px; margin-top:8px;}
.why-item{padding-top:18px; border-top:2px solid var(--brass);}
.why-title{font-family:'IBM Plex Serif', serif; font-size:16.5px; color:var(--ink); margin-bottom:8px;}
.why-desc{font-size:13.5px; color:var(--ink-dim); line-height:1.55;}
@media(max-width:900px){.why-grid{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.why-grid{grid-template-columns:1fr;}}

.tech-marquee{overflow:hidden; border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:28px 0; margin-top:8px;}
.tech-track{display:flex; gap:48px; width:max-content; animation:scroll-left 32s linear infinite;}
.tech-track span{font-family:'IBM Plex Mono', monospace; font-size:14px; color:var(--ink-dim); white-space:nowrap;}
@keyframes scroll-left{from{transform:translateX(0);} to{transform:translateX(-50%);}}
@media(prefers-reduced-motion: reduce){.tech-track{animation:none; flex-wrap:wrap; gap:24px;}}

.stack-diagram-wrap{display:block;}
.stack-svg{width:100%; height:auto; display:block;}
.flow-line{animation:flowmove 1.6s linear infinite;}
@keyframes flowmove{to{stroke-dashoffset:-18;}}
.core-ring-anim{transform-box:fill-box; transform-origin:center; animation:spin 24s linear infinite;}
@media(prefers-reduced-motion: reduce){.flow-line{animation:none;} .core-ring-anim{animation:none;}}
.stack-legend{display:flex; gap:28px; justify-content:center; margin-top:18px; flex-wrap:wrap;}
.stack-legend-item{display:flex; align-items:center; gap:8px; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--ink-dim);}
.stack-legend-dot{width:8px; height:8px; border-radius:50%; flex-shrink:0;}
.stack-mobile-list{display:none;}
.stack-mobile-list .node{border-left-width:3px; border-left-style:solid;}
@media(max-width:760px){
  .stack-diagram-wrap{display:none;}
  .stack-mobile-list{display:flex; flex-direction:column; gap:10px;}
}

.versus{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line); border:1px solid var(--line);}
.versus-head{padding:22px 28px; font-family:'IBM Plex Mono', monospace; font-size:13px; font-weight:600; letter-spacing:0.02em; background:var(--panel); display:flex; align-items:center;}
.versus-head.them{color:var(--ink-dim);}
.versus-head.us{color:var(--brass); background:var(--brass-tint);}
.versus-item{padding:18px 28px; font-size:14.5px; color:var(--ink-dim); background:var(--panel); display:flex; align-items:center; gap:12px;}
.versus-item.us{color:var(--ink);}
.versus-item::before{font-family:'IBM Plex Mono', monospace; flex-shrink:0;}
.versus-item.them::before{content:'×'; color:var(--danger);}
.versus-item.us::before{content:'✓'; color:var(--signal);}
.versus-mobile-legend{display:none;}
@media(max-width:700px){
  .versus{grid-template-columns:1fr;}
  .versus-head{display:none;}
  .versus-item{padding:16px 20px;}
  .versus-item.us{background:var(--brass-tint);}
  .versus-mobile-legend{display:flex; justify-content:space-between; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--ink-dim); margin-bottom:10px; padding:0 4px;}
  .versus-mobile-legend span:last-child{color:var(--brass); font-weight:600;}
}
.math-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px;}
.math-card{border:1px solid var(--line); border-radius:2px; padding:32px; background:var(--panel); position:relative;}
.math-card.muted{opacity:0.72;}
.math-card.featured{border-color:var(--brass); border-width:2px; background:var(--brass-tint); box-shadow:0 4px 16px rgba(79,70,229,0.1);}
.badge{position:absolute; top:-12px; left:32px; background:var(--brass); color:#fff; font-family:'IBM Plex Mono', monospace; font-size:11px; font-weight:600; padding:5px 12px; border-radius:20px; letter-spacing:0.03em;}
.math-title{font-family:'IBM Plex Mono', monospace; font-size:12px; text-transform:uppercase; letter-spacing:0.06em; color:var(--ink-dim); margin-bottom:24px;}
.math-card.featured .math-title{color:var(--brass); font-weight:600;}
.math-row{display:flex; justify-content:space-between; padding:13px 0; border-bottom:1px solid var(--line); font-size:14.5px;}
.math-row:last-child{border-bottom:none;}
.math-row .k{color:var(--ink-dim);}
.k-tag{font-size:9.5px; opacity:0.6; font-style:italic;}
.math-row .v{font-family:'IBM Plex Mono', monospace; color:var(--ink); text-align:right;}
.math-card.featured .v{color:var(--brass); font-weight:600;}
@media(max-width:700px){.math-grid{grid-template-columns:1fr;}}

.pricing-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin-top:8px;}
.price-card{border:1px solid var(--line); border-radius:4px; padding:32px; background:var(--panel); display:flex; flex-direction:column; position:relative;}
.price-card.featured{border-color:var(--brass); border-width:2px; background:var(--brass-tint); box-shadow:0 8px 24px rgba(79,70,229,0.14);}
.price-name{font-family:'IBM Plex Serif', serif; font-size:19px; color:var(--ink); margin-bottom:8px;}
.price-desc{font-size:13.5px; color:var(--ink-dim); line-height:1.55; margin-bottom:20px; min-height:40px;}
.price-amount{font-family:'IBM Plex Mono', monospace; font-size:22px; color:var(--ink); font-weight:600; margin-bottom:8px;}
.price-original{text-decoration:line-through; color:var(--ink-dim); font-weight:400; font-size:16px; margin-right:8px;}
.launch-note{font-family:'Inter', sans-serif; font-size:12px; font-weight:600; color:var(--signal); margin-bottom:20px;}
.price-card.featured .price-amount{color:var(--brass);}
.price-period{font-size:13px; color:var(--ink-dim); font-weight:400;}
.price-features{list-style:none; margin-bottom:28px; margin-top:16px; flex-grow:1;}
.price-features li{font-size:13.5px; color:var(--ink-dim); padding:9px 0; border-top:1px solid var(--line); padding-left:18px; position:relative;}
.price-features li:first-child{border-top:none;}
.price-features li::before{content:'✓'; position:absolute; left:0; color:var(--signal); font-family:'IBM Plex Mono', monospace; font-size:12px;}
.price-cta{width:100%; text-align:center;}
.price-note{margin-top:24px; font-size:12.5px; color:var(--ink-dim); text-align:center;}
@media(max-width:900px){.pricing-grid{grid-template-columns:1fr;}}

.process{display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line);}
.process-step{background:var(--panel); padding:28px 24px;}
.process-num{font-family:'IBM Plex Mono', monospace; color:var(--brass-soft); font-size:12px; margin-bottom:16px;}
.process-title{font-family:'IBM Plex Serif', serif; font-size:17px; margin-bottom:10px; color:var(--ink);}
.process-desc{font-size:13.5px; color:var(--ink-dim); line-height:1.55;}
@media(max-width:900px){.process{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.process{grid-template-columns:1fr;}}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{width:100%; background:none; border:none; font-family:'Inter', sans-serif; padding:22px 0; display:flex; justify-content:space-between; align-items:center; cursor:pointer; font-size:16px; font-weight:500; color:var(--ink); text-align:left;}
.faq-q:focus-visible{outline:2px solid var(--brass); outline-offset:4px;}
.faq-q::after{content:'+'; font-family:'IBM Plex Mono', monospace; color:var(--brass); font-size:20px; transition:transform .2s;}
.faq-item.open .faq-q::after{transform:rotate(45deg);}
.faq-a{max-height:0; overflow:hidden; transition:max-height .25s ease;}
.faq-item.open .faq-a{max-height:240px;}
.faq-a p{padding-bottom:22px; color:var(--ink-dim); font-size:14.5px; line-height:1.65; max-width:640px;}
footer{padding:64px 0 40px;}
.contact-panel{background:var(--panel); border:1px solid var(--line); border-radius:2px; padding:48px; display:flex; justify-content:space-between; align-items:center; gap:32px; flex-wrap:wrap; box-shadow:0 1px 2px rgba(20,24,31,0.04);}
.contact-panel h2{max-width:420px; margin-bottom:0;}
.footer-meta{margin-top:40px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:16px; font-size:12.5px; color:var(--ink-dim); font-family:'IBM Plex Mono', monospace;}
.powered-by{display:inline-flex; align-items:center; gap:6px;}
.kawa-logo{height:15px; width:auto; vertical-align:middle; opacity:0.82;}

/* ===== mobile refinement pass ===== */
@media(max-width:640px){
  .hero{padding:56px 0 44px;}
  section{padding:52px 0;}
  .section-head{margin-bottom:36px;}
  .hero-ctas{flex-direction:column; align-items:stretch;}
  .hero-ctas .btn-primary, .hero-ctas .btn-ghost{text-align:center;}
  .hero-stats{margin-top:44px;}

  .problem-item{padding:18px 20px;}
  .service-card{padding:22px;}
  .service-title{font-size:17px;}

  .math-card{padding:22px;}
  .badge{left:22px;}

  .price-card{padding:22px;}
  .pricing-grid{gap:16px;}

  .process-step{padding:22px 20px;}

  .contact-panel{padding:28px;}
  .contact-panel h2{font-size:22px;}

  .stack-legend{gap:16px;}
}