/* ============================================================
   RB SOLUTIONS — Design tokens
   Concept: technical blueprint / architectural drafting sheet
   ============================================================ */
:root{
  --ink-900:#0B2942;      /* deep blueprint navy - base bg */
  --ink-800:#0F3457;      /* panel bg */
  --ink-700:#154267;      /* card bg */
  --line:rgba(244,247,250,0.14);   /* grid lines */
  --line-strong:rgba(244,247,250,0.28);
  --paper:#F4F7FA;        /* off-white "paper" text */
  --paper-dim:#9FB6CC;    /* muted blue-grey text */
  --amber:#F2A93B;        /* accent — pencil/marker amber */
  --cyan:#5FD8E8;         /* accent — trace cyan */
  --danger:#E86A5C;

  --display: "Space Grotesk", "IBM Plex Sans", sans-serif;
  --body: "IBM Plex Sans", Arial, sans-serif;
  --mono: "IBM Plex Mono", "Courier New", monospace;

  --radius: 2px;
  --max: 1180px;
}

@font-face{ font-display: swap; }

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--body);
  line-height:1.6;
  font-size:16px;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:48px 48px;
}
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
button{ font-family:inherit; cursor:pointer; }
input, textarea, select{ font-family:inherit; }

.wrap{ max-width:var(--max); margin:0 auto; padding:0 28px; }
.eyebrow{
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--amber);
  display:flex; align-items:center; gap:10px;
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";
  width:22px; height:1px;
  background:var(--amber);
  display:inline-block;
}
h1,h2,h3,h4{ font-family:var(--display); font-weight:600; letter-spacing:-0.01em; color:var(--paper); }
h1{ font-size:clamp(2.4rem, 5vw, 4rem); line-height:1.05; }
h2{ font-size:clamp(1.8rem, 3.4vw, 2.6rem); line-height:1.15; }
h3{ font-size:1.3rem; }
p{ color:var(--paper-dim); }
.lede{ font-size:1.15rem; color:var(--paper-dim); max-width:640px; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 24px;
  font-family:var(--mono);
  font-size:13.5px;
  letter-spacing:.04em;
  text-transform:uppercase;
  border-radius:var(--radius);
  border:1px solid transparent;
  transition:transform .15s ease, background .15s ease, border-color .15s ease;
  white-space:nowrap;
}
.btn:focus-visible{ outline:2px solid var(--cyan); outline-offset:3px; }
.btn-primary{ background:var(--amber); color:var(--ink-900); }
.btn-primary:hover{ transform:translateY(-2px); }
.btn-ghost{ border-color:var(--line-strong); color:var(--paper); }
.btn-ghost:hover{ border-color:var(--cyan); color:var(--cyan); }
.btn-block{ width:100%; justify-content:center; }

/* ---------- Header / Nav ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:rgba(11,41,66,0.88);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  height:78px;
}
.logo{ display:flex; align-items:center; gap:10px; font-family:var(--mono); }
.logo-mark{
  width:36px; height:36px;
  border:1.5px solid var(--amber);
  display:flex; align-items:center; justify-content:center;
  font-family:var(--display); font-weight:700; font-size:14px;
  color:var(--amber);
  position:relative;
}
.logo-mark::after{
  content:"";
  position:absolute; top:-5px; left:-5px; right:-5px; bottom:-5px;
  border:1px solid var(--line-strong);
}
.logo-text{ font-size:15px; letter-spacing:.06em; color:var(--paper); text-transform:uppercase; }
.logo-text span{ color:var(--paper-dim); }

.nav-links{ display:flex; gap:34px; align-items:center; }
.nav-links a{
  font-family:var(--mono); font-size:13px; letter-spacing:.03em;
  color:var(--paper-dim); text-transform:uppercase;
  position:relative; padding:6px 0;
}
.nav-links a:hover, .nav-links a.active{ color:var(--paper); }
.nav-links a.active::after{
  content:"";
  position:absolute; left:0; right:0; bottom:0; height:2px; background:var(--amber);
}
.nav-cta{ display:flex; align-items:center; gap:22px; }
.nav-toggle{ display:none; background:none; border:1px solid var(--line-strong); width:42px; height:42px; align-items:center; justify-content:center; color:var(--paper); }

/* ---------- Hero ---------- */
.hero{
  padding:88px 0 70px;
  position:relative;
  border-bottom:1px solid var(--line);
}
.hero-grid{
  display:grid; grid-template-columns:1.1fr 0.9fr; gap:50px; align-items:center;
}
.hero-tag{
  font-family:var(--mono); font-size:12px; color:var(--paper-dim);
  border:1px solid var(--line-strong); display:inline-block;
  padding:5px 10px; margin-bottom:22px; letter-spacing:.06em;
}
.hero h1{ margin-bottom:22px; }
.hero h1 em{ font-style:normal; color:var(--amber); }
.hero-actions{ display:flex; gap:14px; margin-top:32px; flex-wrap:wrap; }
.hero-meta{
  display:flex; gap:36px; margin-top:52px; flex-wrap:wrap;
}
.hero-meta div{ font-family:var(--mono); }
.hero-meta .n{ font-size:1.7rem; color:var(--paper); font-family:var(--display); }
.hero-meta .l{ font-size:11.5px; color:var(--paper-dim); text-transform:uppercase; letter-spacing:.06em; }

/* Blueprint schematic graphic */
.schematic{
  aspect-ratio:1/1.05;
  border:1px solid var(--line-strong);
  position:relative;
  padding:22px;
}
.schematic .corner{ position:absolute; width:10px; height:10px; border:1px solid var(--cyan); }
.schematic .c-tl{ top:-1px; left:-1px; border-right:0; border-bottom:0; }
.schematic .c-tr{ top:-1px; right:-1px; border-left:0; border-bottom:0; }
.schematic .c-bl{ bottom:-1px; left:-1px; border-right:0; border-top:0; }
.schematic .c-br{ bottom:-1px; right:-1px; border-left:0; border-top:0; }
.schematic-label{ font-family:var(--mono); font-size:11px; color:var(--cyan); letter-spacing:.05em; margin-bottom:14px; }
.device{
  border:1.5px solid var(--paper-dim);
  border-radius:16px;
  width:62%;
  margin:20px auto;
  padding:10px;
  position:relative;
}
.device .screen{
  background:linear-gradient(160deg, var(--ink-700), var(--ink-800));
  border-radius:8px;
  aspect-ratio:9/17.5;
  padding:14px;
  display:flex; flex-direction:column; gap:8px;
}
.device .bar{ height:8px; background:var(--line-strong); border-radius:2px; }
.device .bar.short{ width:55%; }
.device .bar.accent{ background:var(--amber); width:35%; height:10px; margin-top:auto; }
.dim-line{ display:flex; align-items:center; gap:6px; margin-top:16px; }
.dim-line .t{ flex:1; height:1px; background:var(--line-strong); }
.dim-line span{ font-family:var(--mono); font-size:10.5px; color:var(--paper-dim); }

/* ---------- Section shell ---------- */
.section{ padding:90px 0; border-bottom:1px solid var(--line); }
.section.tight{ padding:60px 0; }
.section-head{ display:flex; justify-content:space-between; align-items:flex-end; gap:24px; margin-bottom:52px; flex-wrap:wrap; }
.section-head .lede{ margin-top:14px; }

/* ---------- Cards / Grids ---------- */
.grid{ display:grid; gap:26px; }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }

.card{
  background:var(--ink-800);
  border:1px solid var(--line);
  padding:32px 28px;
  position:relative;
}
.card:hover{ border-color:var(--line-strong); }
.card-code{
  font-family:var(--mono); font-size:11.5px; color:var(--amber);
  letter-spacing:.08em; margin-bottom:18px; display:block;
}
.card-icon{
  width:46px; height:46px; border:1px solid var(--line-strong);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:20px; color:var(--cyan);
}
.card h3{ margin-bottom:10px; }
.card p{ font-size:14.5px; }
.card-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:18px; }
.tag{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.04em;
  color:var(--paper-dim); border:1px solid var(--line); padding:4px 9px;
  text-transform:uppercase;
}

/* ---------- Process / timeline ---------- */
.process{ display:grid; grid-template-columns:repeat(5,1fr); gap:0; position:relative; }
.process::before{
  content:"";
  position:absolute; top:23px; left:0; right:0; height:1px;
  background:repeating-linear-gradient(90deg, var(--line-strong) 0 8px, transparent 8px 16px);
}
.p-step{ padding:0 16px 0 0; position:relative; }
.p-num{
  width:46px; height:46px; border:1px solid var(--amber); border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); color:var(--amber); background:var(--ink-900);
  position:relative; z-index:2; margin-bottom:20px; font-size:13px;
}
.p-step h4{ font-size:16px; margin-bottom:8px; color:var(--paper); }
.p-step p{ font-size:13.5px; }

/* ---------- Stats bar ---------- */
.stats-bar{
  display:grid; grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
}
.stat{ padding:34px 28px; border-left:1px solid var(--line); }
.stat:first-child{ border-left:none; }
.stat .n{ font-family:var(--display); font-size:2.4rem; color:var(--amber); }
.stat .l{ font-family:var(--mono); font-size:11.5px; text-transform:uppercase; letter-spacing:.05em; color:var(--paper-dim); margin-top:6px; }

/* ---------- Testimonials ---------- */
.quote-card{ background:var(--ink-800); border:1px solid var(--line); padding:34px; }
.quote-card .mark{ font-family:var(--display); font-size:2.6rem; color:var(--amber); line-height:1; display:block; margin-bottom:6px; }
.quote-card p.quote{ color:var(--paper); font-size:15px; margin-bottom:22px; }
.quote-person{ display:flex; align-items:center; gap:12px; }
.quote-avatar{ width:42px; height:42px; border:1px solid var(--line-strong); border-radius:50%; display:flex; align-items:center; justify-content:center; font-family:var(--mono); font-size:13px; color:var(--cyan); }
.quote-person .name{ font-size:13.5px; color:var(--paper); }
.quote-person .role{ font-size:11.5px; color:var(--paper-dim); font-family:var(--mono); }

/* ---------- Portfolio ---------- */
.filters{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom:40px; }
.filter-btn{
  font-family:var(--mono); font-size:12px; letter-spacing:.04em; text-transform:uppercase;
  padding:9px 16px; border:1px solid var(--line-strong); background:transparent; color:var(--paper-dim);
}
.filter-btn.active, .filter-btn:hover{ color:var(--ink-900); background:var(--amber); border-color:var(--amber); }
.work-card{ border:1px solid var(--line); background:var(--ink-800); overflow:hidden; }
.work-thumb{
  aspect-ratio:16/10.5; position:relative; overflow:hidden;
  display:flex; align-items:center; justify-content:center;
}
.work-thumb .grid-pattern{ position:absolute; inset:0; opacity:.5;
  background-image:linear-gradient(var(--line-strong) 1px, transparent 1px), linear-gradient(90deg, var(--line-strong) 1px, transparent 1px);
  background-size:22px 22px; }
.work-thumb .icon{ position:relative; z-index:1; font-family:var(--display); font-size:2.2rem; color:var(--cyan); opacity:.85; }
.work-body{ padding:24px; }
.work-body .cat{ font-family:var(--mono); font-size:10.5px; color:var(--amber); text-transform:uppercase; letter-spacing:.06em; margin-bottom:8px; display:block; }

/* ---------- CTA banner ---------- */
.cta-banner{
  background:var(--ink-800);
  border:1px solid var(--line-strong);
  padding:56px 48px;
  display:flex; align-items:center; justify-content:space-between; gap:32px; flex-wrap:wrap;
  position:relative;
}
.cta-banner .corner{ position:absolute; width:14px; height:14px; border:1.5px solid var(--amber); }
.cta-banner .c-tl{ top:-1px; left:-1px; border-right:0; border-bottom:0; }
.cta-banner .c-br{ bottom:-1px; right:-1px; border-left:0; border-top:0; }

/* ---------- Blog ---------- */
.post-card{ border:1px solid var(--line); background:var(--ink-800); padding:26px; display:flex; flex-direction:column; gap:14px; }
.post-meta{ display:flex; gap:14px; font-family:var(--mono); font-size:11px; color:var(--paper-dim); text-transform:uppercase; }
.post-meta .cat{ color:var(--cyan); }
.post-card h3{ font-size:1.15rem; }
.read-more{ font-family:var(--mono); font-size:12px; color:var(--amber); letter-spacing:.04em; text-transform:uppercase; margin-top:auto; display:inline-flex; gap:6px; align-items:center; }

/* ---------- Team ---------- */
.member{ text-align:left; }
.member-photo{
  aspect-ratio:1/1; border:1px solid var(--line-strong); margin-bottom:16px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--display); font-size:2rem; color:var(--paper-dim);
  background:var(--ink-800);
}
.member .role{ font-family:var(--mono); font-size:11.5px; color:var(--amber); text-transform:uppercase; letter-spacing:.05em; margin-top:4px; }

/* ---------- Forms ---------- */
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.field{ margin-bottom:18px; }
.field label{
  display:block; font-family:var(--mono); font-size:11.5px; text-transform:uppercase;
  letter-spacing:.05em; color:var(--paper-dim); margin-bottom:8px;
}
.field input, .field textarea, .field select{
  width:100%; background:var(--ink-800); border:1px solid var(--line-strong);
  color:var(--paper); padding:13px 14px; font-size:14.5px; border-radius:var(--radius);
}
.field input:focus, .field textarea:focus, .field select:focus{ outline:2px solid var(--cyan); outline-offset:1px; border-color:var(--cyan); }
.field textarea{ resize:vertical; min-height:130px; }
.form-note{ font-size:12.5px; color:var(--paper-dim); margin-top:10px; }
.form-success{ display:none; background:rgba(95,216,232,.1); border:1px solid var(--cyan); color:var(--paper); padding:16px; font-size:14px; margin-top:16px; }

.info-card{ display:flex; gap:16px; padding:22px 0; border-bottom:1px solid var(--line); }
.info-card:last-child{ border-bottom:none; }
.info-icon{ width:38px; height:38px; border:1px solid var(--line-strong); flex-shrink:0; display:flex; align-items:center; justify-content:center; color:var(--cyan); }
.info-card .label{ font-family:var(--mono); font-size:11px; text-transform:uppercase; color:var(--paper-dim); letter-spacing:.05em; }
.info-card .value{ color:var(--paper); font-size:14.5px; margin-top:2px; }

.map-box{
  border:1px solid var(--line-strong); aspect-ratio:16/9;
  display:flex; align-items:center; justify-content:center; flex-direction:column; gap:10px;
  background-image:linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:30px 30px;
}
.map-box .pin{ width:14px; height:14px; border:2px solid var(--amber); border-radius:50% 50% 50% 0; transform:rotate(-45deg); }
.map-box span{ font-family:var(--mono); font-size:12px; color:var(--paper-dim); }

/* ---------- FAQ ---------- */
.faq-item{ border-bottom:1px solid var(--line); }
.faq-q{
  width:100%; background:none; border:none; color:var(--paper); text-align:left;
  padding:22px 0; display:flex; justify-content:space-between; align-items:center;
  font-family:var(--display); font-size:16px;
}
.faq-q .plus{ font-family:var(--mono); color:var(--amber); font-size:20px; transition:transform .2s ease; }
.faq-item.open .faq-q .plus{ transform:rotate(45deg); }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .25s ease; }
.faq-a p{ padding-bottom:22px; font-size:14.5px; }

/* ---------- Values ---------- */
.value-item{ display:flex; gap:18px; }
.value-num{ font-family:var(--mono); color:var(--amber); font-size:13px; padding-top:4px; }

/* ---------- Footer / Title block ---------- */
footer.site{ padding-top:80px; }
.footer-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1.2fr; gap:40px; padding-bottom:60px; }
.footer-brand p{ font-size:14px; margin-top:16px; max-width:280px; }
.footer-col h4{ font-family:var(--mono); font-size:12px; text-transform:uppercase; letter-spacing:.06em; color:var(--paper-dim); margin-bottom:18px; }
.footer-col ul li{ margin-bottom:11px; }
.footer-col a{ font-size:14px; color:var(--paper-dim); }
.footer-col a:hover{ color:var(--amber); }
.social-row{ display:flex; gap:10px; margin-top:20px; }
.social-row a{ width:36px; height:36px; border:1px solid var(--line-strong); display:flex; align-items:center; justify-content:center; font-family:var(--mono); font-size:12px; }
.social-row a:hover{ border-color:var(--amber); color:var(--amber); }
.newsletter{ display:flex; margin-top:8px; }
.newsletter input{ flex:1; background:var(--ink-800); border:1px solid var(--line-strong); border-right:none; color:var(--paper); padding:11px 12px; font-size:13px; }
.newsletter button{ background:var(--amber); border:none; padding:0 16px; color:var(--ink-900); font-family:var(--mono); font-size:12px; }

.title-block{
  border-top:1px solid var(--line-strong);
  padding:22px 0;
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;
}
.title-block .tb-left{ display:flex; gap:28px; flex-wrap:wrap; font-family:var(--mono); font-size:11px; color:var(--paper-dim); }
.title-block .tb-left b{ color:var(--paper); }
.title-block .tb-right{ font-family:var(--mono); font-size:11px; color:var(--paper-dim); }
.title-block .tb-right a{ color:var(--paper-dim); }
.title-block .tb-right a:hover{ color:var(--amber); }

/* ---------- Page header (inner pages) ---------- */
.page-header{ padding:56px 0 46px; border-bottom:1px solid var(--line); }
.breadcrumb{ font-family:var(--mono); font-size:12px; color:var(--paper-dim); margin-bottom:18px; }
.breadcrumb .sep{ margin:0 8px; color:var(--line-strong); }
.breadcrumb .cur{ color:var(--amber); }

/* ---------- Utilities ---------- */
.center{ text-align:center; margin-left:auto; margin-right:auto; }
.mt-0{ margin-top:0; }
.two-col{ display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .grid-4{ grid-template-columns:repeat(2,1fr); }
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .stats-bar{ grid-template-columns:repeat(2,1fr); }
  .process{ grid-template-columns:repeat(1,1fr); gap:34px; }
  .process::before{ display:none; }
  .hero-grid{ grid-template-columns:1fr; }
  .schematic{ max-width:340px; margin:0 auto; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
  .two-col{ grid-template-columns:1fr; }
  .form-row{ grid-template-columns:1fr; }
}
@media (max-width: 680px){
  .nav-links, .nav-cta .btn-ghost{ display:none; }
  .nav-toggle{ display:flex; }
  .grid-4, .grid-3, .grid-2{ grid-template-columns:1fr; }
  .stats-bar{ grid-template-columns:1fr 1fr; }
  .footer-grid{ grid-template-columns:1fr; }
  .cta-banner{ padding:36px 24px; }
  .section{ padding:60px 0; }
}

/* Mobile nav drawer */
.mobile-drawer{
  display:none; position:fixed; inset:0; background:var(--ink-900); z-index:60;
  flex-direction:column; padding:24px 28px;
}
.mobile-drawer.open{ display:flex; }
.mobile-drawer .close{ align-self:flex-end; background:none; border:1px solid var(--line-strong); width:40px; height:40px; color:var(--paper); }
.mobile-drawer nav{ margin-top:40px; display:flex; flex-direction:column; gap:26px; }
.mobile-drawer nav a{ font-family:var(--display); font-size:24px; color:var(--paper); }
.mobile-drawer .btn{ margin-top:30px; }