/* ==================================================================
   PERSPECTIVE BUILDING CONSULTANCY
   style.css - design tokens, reset, typography, global components
   (header, overlay menu, footer, buttons, marquee, utilities)

   Load order: style.css -> pages.css -> responsive.css
   All media queries live in responsive.css.
   ================================================================== */

/* ------------------------------------------------------------------
   1. Design tokens (PBC Brand Book v.IV palette)
   ------------------------------------------------------------------ */
:root{
  /* brand */
  --indigo:#2B2978;
  --magenta:#6B2774;
  --purple:#643C80;
  --cobalt:#007EB5;
  --lavender:#62ABB1;
  --lapis:#12A1D5;
  --silver:#D0CECD;

  /* surfaces */
  --bg:#ffffff;
  --bg2:#f5f5f7;
  --bg3:#ededf0;
  --panel:#ffffff;
  --panel2:#fafafc;

  /* lines and text */
  --line:rgba(0,0,0,.09);
  --line2:rgba(0,0,0,.16);
  --txt:#1d1d1f;
  --mut:#6e6e73;
  /* --dim was #86868b in the prototype: 3.6:1 on white, which fails WCAG AA
     for small text. Darkened to 5.3:1 on white and 4.9:1 on --bg2.
     The visual difference is slight; the hierarchy comes from size, not tone. */
  --dim:#6b6b70;

  /* gradients */
  --grad:linear-gradient(98deg,#6B2774 0%,#2B2978 46%,#007EB5 100%);
  --grad-soft:linear-gradient(98deg,#6B2774,#3F4AA0 46%,#12A1D5);

  /* type and motion */
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","Helvetica Neue","Helvetica","Arial","Segoe UI",sans-serif;
  --ease:cubic-bezier(.25,.7,.25,1);

  /* layout */
  --header-h:56px;
  --wrap:1100px;
}

/* ------------------------------------------------------------------
   2. Reset and base
   ------------------------------------------------------------------ */
*{margin:0;padding:0;box-sizing:border-box}
/* the hidden attribute must beat component display rules (e.g. .proj), or JS filtering cannot hide anything */
[hidden]{display:none !important}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--txt);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;display:block}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font-family:var(--font)}
::selection{background:var(--cobalt);color:#fff}

/* ------------------------------------------------------------------
   3. Typography
   ------------------------------------------------------------------ */
h1,h2,h3,h4{font-weight:600;line-height:1.06;letter-spacing:-.015em;color:var(--txt)}
h1{font-size:clamp(2.8rem,6.4vw,5.4rem);font-weight:700}
h2{font-size:clamp(2rem,4.4vw,3.4rem)}
h3{font-size:1.25rem;font-weight:600}
.lede{font-size:clamp(1.1rem,1.6vw,1.45rem);color:var(--mut);font-weight:400;line-height:1.45;max-width:54ch}
.eyebrow{font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--cobalt)}
.gtxt{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.num{font-variant-numeric:tabular-nums}

/* ------------------------------------------------------------------
   4. Layout helpers
   ------------------------------------------------------------------ */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
section{padding:130px 0;position:relative}
.pad-sm{padding:80px 0}
.deep{background:var(--bg2)}
.deeper{background:var(--bg3)}
main{position:relative;z-index:1}

/* screen-reader only, and skip link */
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:50%;top:0;transform:translate(-50%,-140%);
  z-index:500;background:var(--txt);color:#fff;padding:12px 22px;
  border-radius:0 0 12px 12px;font-size:.9rem;font-weight:600;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ------------------------------------------------------------------
   5. Focus states (WCAG 2.4.7)
   ------------------------------------------------------------------ */
:focus-visible{
  outline:3px solid var(--cobalt);
  outline-offset:3px;
  border-radius:4px;
}
.card-link:focus-visible,
.svc-card:focus-visible,
.proj:focus-visible,
.person:focus-visible,
.sector:focus-visible,
.sub:focus-visible,
.post:focus-visible,
.cs-next:focus-visible{outline:3px solid var(--cobalt);outline-offset:4px}

/* ------------------------------------------------------------------
   6. Reveal on scroll
   ------------------------------------------------------------------ */
[data-rev]{
  opacity:0;transform:translateY(26px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
  transition-delay:var(--d,0s);
  will-change:opacity,transform;
}
[data-rev].vis{opacity:1;transform:none}
/* if JS never runs, content must still be visible */
.no-js [data-rev]{opacity:1;transform:none}

/* ------------------------------------------------------------------
   7. Scroll progress bar
   ------------------------------------------------------------------ */
#prog{position:fixed;top:0;left:0;height:2px;width:0;background:var(--grad);z-index:140;transition:width .12s linear}

/* ------------------------------------------------------------------
   8. Preloader (home page, first visit only - see animations.js)
   ------------------------------------------------------------------ */
/* The fade-out is a CSS animation, so the overlay always clears even if
   JavaScript never runs. main.js only shortens it for repeat visits. */
#preloader{
  position:fixed;inset:0;z-index:400;background:#fff;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:26px;
  transition:opacity .45s var(--ease),visibility .45s;
  /* holds for 2s, then fades over 0.5s */
  animation:plOut .5s var(--ease) 2s forwards;
}
@keyframes plOut{to{opacity:0;visibility:hidden}}
body.loaded #preloader{opacity:0;visibility:hidden;animation:none}
#preloader .pl-stack{position:relative;width:180px;height:180px;filter:drop-shadow(0 14px 34px rgba(0,0,0,.12))}
#preloader .pl-stack img{width:100%;height:100%;opacity:0;animation:plFade .5s ease both}
#preloader .pl-word{font-size:1.05rem;font-weight:600;letter-spacing:.5em;text-indent:.5em;color:var(--txt);opacity:0;animation:plFade .5s ease .15s both}
#preloader .pl-tag{font-size:1rem;font-style:italic;color:var(--mut);max-width:42ch;text-align:center;line-height:1.5;opacity:0;animation:plFade .5s ease .28s both;padding:0 26px}
#preloader .pl-by{display:block;font-style:normal;font-size:.7rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--cobalt);margin-top:14px}
@keyframes plFade{to{opacity:1}}

/* ------------------------------------------------------------------
   9. Header
   ------------------------------------------------------------------ */
header{
  position:fixed;top:0;left:0;right:0;z-index:110;
  transition:transform .4s var(--ease),background .3s;
  background:rgba(251,251,253,.8);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid transparent;
}
header.scrolled{border-bottom-color:var(--line)}
header.hide{transform:translateY(-100%)}
.nav{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:24px}
.brand{display:flex;align-items:center;gap:10px}
.brand .ring{width:32px;height:32px;flex:none;transition:transform .6s var(--ease)}
.brand:hover .ring{transform:rotate(120deg)}
.brand .name{font-weight:600;font-size:1.05rem;letter-spacing:-.01em;color:var(--txt)}
.top-links{display:flex;gap:30px;font-size:.84rem;color:var(--mut);align-items:center}
.top-links a{transition:color .2s}
.top-links a:hover{color:var(--txt)}
.top-links a[aria-current="page"]{color:var(--txt);font-weight:600}
.nav-right{display:flex;align-items:center;gap:14px}
.nav-cta{
  background:var(--cobalt);color:#fff;padding:8px 18px;border-radius:980px;
  font-size:.8rem;font-weight:500;border:none;transition:background .25s;
  display:inline-flex;align-items:center;
}
.nav-cta:hover{background:#006A9B}
.menu-btn{
  display:none;align-items:center;gap:11px;background:transparent;border:none;
  border-radius:980px;padding:8px 10px;cursor:pointer;font-size:.74rem;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--txt);z-index:130;
}
.menu-ico{display:inline-flex;flex-direction:column;gap:5px;width:22px}
.menu-ico i{height:2px;width:100%;border-radius:2px;display:block;transition:transform .4s var(--ease),opacity .25s;background:var(--txt)}
/* three equal lines -> a cross (line + gap = 7px) */
body.menu-open .menu-ico i:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.menu-open .menu-ico i:nth-child(2){opacity:0}
body.menu-open .menu-ico i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* keep the logo and the close button above the open overlay */
body.menu-open header{
  z-index:125;transform:none;background:transparent;border-bottom-color:transparent;
  backdrop-filter:none;-webkit-backdrop-filter:none;
}
body.menu-open .nav-cta{visibility:hidden}

/* ------------------------------------------------------------------
   10. Overlay menu
   ------------------------------------------------------------------ */
.overlay{
  position:fixed;inset:0;z-index:120;
  background:rgba(251,251,253,.96);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  opacity:0;visibility:hidden;
  transition:opacity .4s var(--ease),visibility .4s;
  display:flex;align-items:center;overflow:hidden;
}
body.menu-open{overflow:hidden}
body.menu-open .overlay{opacity:1;visibility:visible}
.overlay-inner{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 32px}
.ov-nav{display:flex;flex-direction:column;gap:6px}
.ov-nav a{
  display:flex;align-items:baseline;gap:18px;
  font-size:clamp(1.9rem,5vw,3.2rem);font-weight:600;letter-spacing:-.02em;
  color:var(--txt);width:fit-content;line-height:1.2;
  transition:color .2s;opacity:0;transform:translateY(22px);
}
.ov-nav a .oi{font-size:.72rem;font-weight:600;letter-spacing:.16em;color:var(--cobalt)}
.ov-nav a:hover,.ov-nav a[aria-current="page"]{color:var(--cobalt)}
body.menu-open .ov-nav a{opacity:1;transform:none;transition:opacity .5s var(--ease),transform .5s var(--ease),color .2s}
body.menu-open .ov-nav a:nth-child(1){transition-delay:.05s}
body.menu-open .ov-nav a:nth-child(2){transition-delay:.09s}
body.menu-open .ov-nav a:nth-child(3){transition-delay:.13s}
body.menu-open .ov-nav a:nth-child(4){transition-delay:.17s}
body.menu-open .ov-nav a:nth-child(5){transition-delay:.21s}
body.menu-open .ov-nav a:nth-child(6){transition-delay:.25s}
body.menu-open .ov-nav a:nth-child(7){transition-delay:.29s}
body.menu-open .ov-nav a:nth-child(8){transition-delay:.33s}
.ov-foot{display:flex;gap:44px;margin-top:50px;flex-wrap:wrap;font-size:.92rem;color:var(--mut)}
.ov-foot .ov-k{display:block;font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--cobalt);font-weight:600;margin-bottom:6px}
.ov-foot a:hover{text-decoration:underline}

/* ------------------------------------------------------------------
   11. Buttons and inline links
   ------------------------------------------------------------------ */
.btn-g{
  background:var(--cobalt);color:#fff;padding:13px 28px;border-radius:980px;
  font-weight:500;font-size:1rem;border:none;cursor:pointer;
  transition:background .25s;display:inline-flex;align-items:center;gap:8px;
}
.btn-g:hover{background:#006A9B}
.btn-o{
  background:transparent;color:var(--cobalt);border:1px solid var(--cobalt);
  padding:13px 28px;border-radius:980px;font-weight:500;font-size:1rem;cursor:pointer;
  transition:background .25s,color .25s;display:inline-flex;align-items:center;gap:8px;
}
.btn-o:hover{background:var(--cobalt);color:#fff}
.ln-cta{font-weight:500;font-size:1.05rem;color:var(--cobalt);white-space:nowrap;display:inline-flex;align-items:center;gap:6px}
.ln-cta::after{content:"\203A";color:var(--cobalt);transition:transform .25s var(--ease);font-size:1.1em}
.ln-cta:hover{text-decoration:underline}
.ln-cta:hover::after{transform:translateX(3px)}

/* whole-card links keep the card look but behave as one link */
.card-link{display:block;color:inherit;text-decoration:none}

/* ------------------------------------------------------------------
   12. Breadcrumbs
   ------------------------------------------------------------------ */
.breadcrumb{font-size:.8rem;color:var(--mut)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"\203A";color:var(--dim)}
.breadcrumb a{color:var(--cobalt);font-weight:500}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb [aria-current="page"]{color:var(--mut)}
.crumb{font-size:.8rem;font-weight:500;color:var(--cobalt);display:inline-flex;align-items:center;gap:6px}
.crumb:hover{text-decoration:underline}

/* ------------------------------------------------------------------
   13. Marquee
   ------------------------------------------------------------------ */
.marquee{overflow:hidden;background:var(--bg2);position:relative;z-index:2}
.mq-track{display:flex;width:max-content;animation:mq 44s linear infinite;padding:22px 0}
.marquee:hover .mq-track{animation-play-state:paused}
@keyframes mq{to{transform:translateX(-50%)}}
.mq-item{display:flex;align-items:center;gap:18px;padding:0 28px;font-size:.84rem;font-weight:500;letter-spacing:.04em;color:var(--dim);white-space:nowrap}
.mq-item::after{content:"\00B7";color:var(--dim);font-size:1.2rem}

/* ------------------------------------------------------------------
   14. Footer
   ------------------------------------------------------------------ */
footer{background:var(--bg2);padding:0 0 34px;position:relative;overflow:hidden}
.foot-cta{padding:100px 0 80px;border-bottom:1px solid var(--line);position:relative;text-align:center}
.foot-cta h2{max-width:20ch;margin:0 auto;font-size:clamp(2.2rem,5vw,3.8rem)}
.foot-cta .eyebrow{display:block}
.foot-cta .btn-g{margin-top:32px}
.foot-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding:54px 0 40px;border-bottom:1px solid var(--line);text-align:left}
footer h3{color:var(--txt);font-size:.78rem;letter-spacing:.02em;margin-bottom:16px;font-weight:600}
footer ul{list-style:none}
footer li{margin-bottom:10px;font-size:.85rem;color:var(--mut);transition:color .2s}
footer li a:hover{color:var(--txt);text-decoration:underline}
.foot-brand .name{color:var(--txt);font-weight:600;font-size:1.2rem}
.foot-brand p{font-size:.85rem;max-width:32ch;margin-top:12px;color:var(--mut)}
.foot-brand .lockup{display:flex;align-items:center;gap:13px}
.foot-brand .lockup img{width:42px;height:42px}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;font-size:.75rem;color:var(--dim);flex-wrap:wrap;gap:12px}
.socials{display:flex;gap:10px}
.socials a{
  width:34px;height:34px;border-radius:50%;border:1px solid var(--line2);
  display:flex;align-items:center;justify-content:center;transition:.25s;
  font-size:.72rem;color:var(--txt);font-weight:600;background:#fff;
}
.socials a:hover{background:var(--txt);color:#fff;border-color:transparent}