/* ==========================================================================
   SimuSolv — design tokens
   ========================================================================== */
:root{
  --bg:            #F7F8F5;
  --surface:       #FFFFFF;
  --surface-alt:   #EFF2EE;
  --ink:           #131A22;
  --ink-muted:     #4C5A65;
  --ink-faint:     #8B98A0;
  --line:          #DFE3DD;
  --line-strong:   #C7CDC4;
  --navy:          #16324E;
  --navy-deep:     #0C1F33;
  --signal:        #0A8C97;
  --signal-deep:   #066670;
  --amber:         #C6752B;

  --font-display: 'Space Grotesk', 'Arial Narrow', sans-serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  --wrap: 1180px;
  --radius: 3px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.08;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
  color:var(--navy-deep);
}
p{ margin:0 0 1em; color:var(--ink-muted); }
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; }

.wrap{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 32px;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--signal-deep);
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:14px;
}
.eyebrow::before{
  content:'';
  width:22px;
  height:1px;
  background:var(--signal);
}

/* ---------- header ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(247,248,245,.92);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:76px;
}
.logo{ display:flex; align-items:center; gap:10px; }
.logo-mark{ width:30px; height:30px; flex:none; }
.logo-text{
  font-family:var(--font-display);
  font-weight:700;
  font-size:20px;
  letter-spacing:-0.02em;
  color:var(--navy-deep);
}
.logo-text span{ color:var(--signal-deep); }

.nav-toggle{
  display:none;
  background:none; border:1px solid var(--line-strong);
  border-radius:var(--radius);
  width:40px; height:36px;
  align-items:center; justify-content:center;
  cursor:pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content:''; display:block; width:18px; height:1.5px; background:var(--navy-deep);
  position:relative; transition:.2s;
}
.nav-toggle span::before{ position:absolute; top:-6px; }
.nav-toggle span::after{ position:absolute; top:6px; }

.main-nav ul{ display:flex; gap:2px; align-items:center; }
.main-nav a{
  display:block;
  padding:10px 16px;
  font-size:14px;
  font-weight:500;
  color:var(--ink-muted);
  border-radius:var(--radius);
  transition:color .15s, background .15s;
  white-space:nowrap;
}
.main-nav a:hover{ color:var(--navy-deep); background:var(--surface-alt); }
.main-nav a.active{ color:var(--navy-deep); font-weight:600; }
.main-nav .nav-contact{
  margin-left:8px;
  background:var(--navy);
  color:#fff !important;
  padding:10px 18px;
}
.main-nav .nav-contact:hover{ background:var(--navy-deep); }

/* ---------- hero ---------- */
.hero{
  position:relative;
  padding:88px 0 72px;
  overflow:hidden;
  border-bottom:1px solid var(--line);
}
.hero .wrap{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:56px;
  align-items:center;
}
.hero h1{
  font-size:clamp(34px,4.4vw,54px);
  max-width:12ch;
}
.hero .lede{
  font-size:18px;
  max-width:46ch;
  color:var(--ink-muted);
  margin-bottom:28px;
}
.hero-cta{ display:flex; gap:14px; flex-wrap:wrap; }
.hero-wave{
  border:1px solid var(--line);
  background:var(--surface);
  border-radius:6px;
  padding:18px;
}
.hero-wave svg{ width:100%; height:auto; display:block; }

.page-hero{
  padding:64px 0 48px;
  border-bottom:1px solid var(--line);
}
.page-hero .wrap{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:48px;
  align-items:end;
}
.page-hero h1{ font-size:clamp(30px,3.6vw,44px); max-width:14ch; }
.page-hero .lede{ font-size:17px; max-width:52ch; color:var(--ink-muted); }
.page-hero .hero-wave{ align-self:center; }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 24px;
  font-size:14.5px; font-weight:600;
  border-radius:var(--radius);
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .15s, background .15s, border-color .15s, color .15s;
}
.btn:hover{ transform:translateY(-1px); }
.btn-primary{ background:var(--navy); color:#fff; }
.btn-primary:hover{ background:var(--navy-deep); }
.btn-ghost{ background:transparent; color:var(--navy); border-color:var(--line-strong); }
.btn-ghost:hover{ border-color:var(--navy); }
.btn-signal{ background:var(--signal); color:#fff; }
.btn-signal:hover{ background:var(--signal-deep); }

/* ---------- sections ---------- */
section{ padding:76px 0; }
.section-tight{ padding:56px 0; }
.section-alt{ background:var(--surface-alt); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.section-head{ max-width:640px; margin-bottom:44px; }
.section-head h2{ font-size:clamp(26px,3vw,36px); }
.section-head p{ font-size:16.5px; }

/* domain cards on home */
.domain-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.domain-card{
  background:var(--surface);
  padding:32px 26px;
  display:flex; flex-direction:column;
  min-height:280px;
  transition:background .2s;
}
.domain-card:hover{ background:var(--surface-alt); }
.domain-card .idx{
  font-family:var(--font-mono);
  font-size:12px; color:var(--ink-faint); margin-bottom:20px;
}
.domain-card h3{ font-size:19px; margin-bottom:10px; }
.domain-card p{ font-size:14.5px; flex:1; }
.domain-card .card-link{
  font-family:var(--font-mono);
  font-size:12.5px; letter-spacing:.04em;
  color:var(--signal-deep); font-weight:600;
  margin-top:16px;
  display:inline-flex; align-items:center; gap:6px;
}
.domain-card .card-link .arrow{ transition:transform .15s; }
.domain-card:hover .card-link .arrow{ transform:translateX(3px); }

/* focus-area / capability grid used across research pages */
.topic-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.topic-card{
  background:var(--surface);
  padding:30px 26px;
}
.topic-card .tag{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--signal-deep);
  margin-bottom:12px;
  display:block;
}
.topic-card h3{ font-size:18px; margin-bottom:10px; }
.topic-card p{ font-size:14.5px; margin-bottom:0; }

/* process / sequence (used on consultancy page — real ordered workflow) */
.process{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:28px;
  counter-reset:step;
}
.process-step{ position:relative; padding-top:52px; }
.process-step::before{
  counter-increment:step;
  content:counter(step,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--signal);
  position:absolute; top:0; left:0;
}
.process-step::after{
  content:'';
  position:absolute; top:8px; left:34px; right:-14px;
  height:1px; background:var(--line-strong);
}
.process-step:last-child::after{ display:none; }
.process-step h3{ font-size:17px; margin-bottom:8px; }
.process-step p{ font-size:14px; }

/* services list on consultancy page */
.service-list{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.service-item{
  background:var(--surface);
  padding:26px 28px;
  display:flex; gap:18px; align-items:flex-start;
}
.service-item .icon{ flex:none; width:34px; height:34px; color:var(--navy); }
.service-item h3{ font-size:16.5px; margin-bottom:6px; }
.service-item p{ font-size:14px; margin:0; }

/* stat strip */
.stat-strip{
  display:grid; grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
}
.stat{ padding:30px 26px; border-left:1px solid var(--line); }
.stat:first-child{ border-left:none; }
.stat .n{ font-family:var(--font-display); font-size:30px; font-weight:700; color:var(--navy); }
.stat .l{ font-family:var(--font-mono); font-size:12px; color:var(--ink-muted); letter-spacing:.03em; margin-top:6px; }

/* about page */
.value-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:1px;
  background:var(--line); border:1px solid var(--line);
}
.value-card{ background:var(--surface); padding:28px 26px; }
.value-card h3{ font-size:16.5px; margin-bottom:8px; }
.value-card p{ font-size:14px; margin:0; }

/* contact */
.contact-grid{
  display:grid; grid-template-columns:.9fr 1.1fr; gap:56px;
}
.contact-detail{ display:flex; gap:14px; padding:18px 0; border-top:1px solid var(--line); }
.contact-detail:last-child{ padding-bottom:0; }
.contact-detail .icon{ flex:none; width:22px; height:22px; margin-top:2px; color:var(--signal-deep); }
.contact-detail h4{ font-family:var(--font-mono); font-size:12px; letter-spacing:.06em; text-transform:uppercase; color:var(--ink-faint); margin:0 0 4px; font-weight:600;}
.contact-detail p, .contact-detail a{ margin:0; color:var(--ink); font-size:15.5px; font-weight:500; }
.contact-detail a:hover{ color:var(--signal-deep); }

.form{ background:var(--surface); border:1px solid var(--line); padding:36px; border-radius:6px; }
.field{ margin-bottom:20px; }
.field label{
  display:block; font-family:var(--font-mono); font-size:12px; letter-spacing:.05em;
  text-transform:uppercase; color:var(--ink-muted); margin-bottom:8px;
}
.field input, .field textarea, .field select{
  width:100%; padding:12px 14px; font-family:var(--font-body); font-size:15px;
  border:1px solid var(--line-strong); border-radius:var(--radius); background:#fff; color:var(--ink);
}
.field input:focus, .field textarea:focus, .field select:focus{
  outline:2px solid var(--signal); outline-offset:1px; border-color:var(--signal);
}
.field textarea{ resize:vertical; min-height:120px; }
.form-note{ font-size:13px; color:var(--ink-faint); margin-top:14px; }

/* map / address block */
.map-frame{
  border:1px solid var(--line); border-radius:6px; overflow:hidden; height:280px;
}
.map-frame iframe{ width:100%; height:100%; border:0; display:block; }

/* CTA band */
.cta-band{
  background:var(--navy-deep);
  color:#fff;
  padding:64px 0;
}
.cta-band h2{ color:#fff; font-size:clamp(24px,3vw,32px); max-width:20ch; }
.cta-band p{ color:#B9C4CC; max-width:52ch; }
.cta-band .btn-ghost{ color:#fff; border-color:#37505F; }
.cta-band .btn-ghost:hover{ border-color:#fff; }

/* footer */
.site-footer{ background:var(--surface-alt); border-top:1px solid var(--line); padding:52px 0 28px; }
.footer-grid{
  display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:40px;
  padding-bottom:36px;
}
.footer-brand p{ font-size:14px; max-width:32ch; }
.footer-col h4{
  font-family:var(--font-mono); font-size:12px; letter-spacing:.06em; text-transform:uppercase;
  color:var(--ink-faint); margin-bottom:14px;
}
.footer-col ul li{ margin-bottom:10px; }
.footer-col a{ font-size:14px; color:var(--ink-muted); }
.footer-col a:hover{ color:var(--navy-deep); }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center;
  padding-top:24px; border-top:1px solid var(--line);
  font-size:13px; color:var(--ink-faint);
}

@keyframes wave-drift{
  0%,100%{ transform:translateY(0); }
  50%{ transform:translateY(-3px); }
}
:focus-visible{ outline:2px solid var(--signal); outline-offset:2px; }

/* utility */
.mono{ font-family:var(--font-mono); }
.text-center{ text-align:center; margin-left:auto; margin-right:auto; }

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero .wrap, .page-hero .wrap{ grid-template-columns:1fr; }
  .hero-wave{ order:-1; }
  .domain-grid{ grid-template-columns:repeat(2,1fr); }
  .topic-grid{ grid-template-columns:repeat(2,1fr); }
  .process{ grid-template-columns:repeat(2,1fr); row-gap:36px; }
  .service-list{ grid-template-columns:1fr; }
  .stat-strip{ grid-template-columns:repeat(2,1fr); }
  .stat:nth-child(3){ border-left:none; }
  .value-grid{ grid-template-columns:1fr; }
  .contact-grid{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
}
@media (max-width:720px){
  .main-nav{
    position:absolute; top:76px; left:0; right:0;
    background:var(--bg); border-bottom:1px solid var(--line);
    display:none;
    max-height:calc(100vh - 76px); overflow:auto;
  }
  .main-nav.open{ display:block; }
  .main-nav ul{ flex-direction:column; align-items:stretch; padding:12px 24px 20px; gap:4px; }
  .main-nav .nav-contact{ margin-left:0; text-align:center; margin-top:8px; }
  .nav-toggle{ display:flex; }
  .domain-grid, .topic-grid{ grid-template-columns:1fr; }
  .process{ grid-template-columns:1fr; }
  .stat-strip{ grid-template-columns:1fr; }
  .stat{ border-left:none; border-top:1px solid var(--line); }
  .stat:first-child{ border-top:none; }
  .footer-grid{ grid-template-columns:1fr; gap:28px; }
  .footer-bottom{ flex-direction:column; gap:10px; align-items:flex-start; }
  section{ padding:52px 0; }
}