/* ============================================================
   Shared case-study stylesheet
   Used by DA, SQ, SOLX, SKL case studies.

   Each page still defines its own small :root block with the
   theme-specific values these shared rules read via var():
     --accent, --accent-deep   primary theme color (was --teal/--navy/--ocean)
     --accent2                 secondary accent, used sparingly (was --gold/--amber)
     --tint                    light theme-tinted fill (was --sage/--sky/--mist/--artifact-bg)
   Base neutrals (--bg, --paper, --ink, --ink-soft, --hairline,
   --artifact-bg, --radius) are identical across all four pages,
   so they're defined once here and can be overridden per-page if
   ever needed.
   ============================================================ */

:root{
  --bg:#FFFFFF;
  --paper:#FFFFFF;
  --ink:#1B211F;
  --ink-soft:#636C70;
  --hairline:#E6E6E2;
  --artifact-bg:#F7F7F5;
  --radius:14px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:'Inter',sans-serif;
  font-weight:400;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1{font-family:'Outfit',sans-serif;font-weight:600;margin:0;letter-spacing:-0.02em;}
h2{font-family:'Outfit',sans-serif;font-weight:600;margin:0;letter-spacing:-0.02em;color:var(--ink);}
h3{font-family:'Inter',sans-serif;font-weight:600;margin:0;}
a{color:inherit;}
img{max-width:100%;display:block;}

/* ---------- topbar ---------- */
.topbar{
  display:flex;justify-content:space-between;align-items:center;
  padding:24px 6vw;font-size:14px;
}
.topbar a{text-decoration:none;color:var(--ink-soft);}
.topbar a:hover{color:var(--accent);}
.topbar .brand{font-family:'Outfit',sans-serif;font-weight:500;color:var(--ink);display:inline-flex;align-items:center;gap:8px;}

/* ---------- hero band (shared structure; each page sets its own
   gradient background, eyebrow color, and photo overlay tint) ---------- */
.hero-band.has-photo{position:relative;overflow:hidden;padding:0;}
.hero-band.has-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0;}
.hero-band.has-photo .hero-inner{position:relative;z-index:2;padding:64px 6vw 72px;}
.hero-band h1{
  font-size:clamp(34px,5vw,60px);
  font-weight:600;letter-spacing:-0.02em;line-height:1.1;color:#FFFFFF;
}
.hero-sub{
  max-width:56ch;font-size:18px;color:rgba(255,255,255,0.82);
  margin-top:22px;line-height:1.6;
}

/* ---------- meta strip ---------- */
.meta-wrap{padding:56px 6vw 56px;position:relative;}
.meta-strip{
  display:grid;grid-template-columns:repeat(4,1fr);
  background:var(--paper);border:1px solid var(--hairline);border-radius:var(--radius);overflow:hidden;
}
.meta-item{background:var(--paper);padding:20px 22px;min-width:0;border-right:1px solid var(--hairline);border-bottom:1px solid var(--hairline);}
.meta-item:nth-child(4n){border-right:none;}
.meta-item:nth-last-child(-n+4){border-bottom:none;}
.meta-item-label{font-size:11px;font-weight:400;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.03em;margin-bottom:6px;}
.meta-item-value{font-size:14px;color:var(--ink);line-height:1.4;}
@media (max-width:900px){.meta-strip{grid-template-columns:repeat(2,1fr);}}
@media (max-width:600px){
  .meta-wrap{padding-right:0;}
  .meta-strip{
    display:flex;grid-template-columns:none;overflow-x:auto;-webkit-overflow-scrolling:touch;
    scroll-snap-type:x proximity;gap:10px;
    border:none;border-radius:0;background:none;
    scrollbar-width:none;-ms-overflow-style:none;
  }
  .meta-strip::-webkit-scrollbar{display:none;}
  .meta-item{
    flex:0 0 auto;min-width:158px;scroll-snap-align:start;
    border:1px solid var(--hairline);border-radius:var(--radius);
  }
  .meta-item:nth-child(4n){border-right:1px solid var(--hairline);}
  .meta-item:nth-last-child(-n+4){border-bottom:1px solid var(--hairline);}
  .meta-item:last-child{margin-right:6vw;}
  .meta-wrap::after{
    content:"";position:absolute;top:56px;bottom:56px;right:0;width:32px;
    background:linear-gradient(to right, transparent, var(--artifact-bg));pointer-events:none;
  }
}

/* ---------- nav (mobile tab bar + desktop floating rail) ---------- */
.nav-rail{display:none;}
.nav-mobile{
  display:block;position:sticky;top:0;z-index:30;
  background:rgba(255,255,255,0.94);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  overflow-x:auto;padding:14px 6vw 0;
  border-bottom:1px solid var(--hairline);white-space:nowrap;
  scrollbar-width:none;-ms-overflow-style:none;
}
.nav-mobile::-webkit-scrollbar{display:none;}
.nav-mobile ol{display:flex;gap:22px;list-style:none;margin:0;padding:0;}
.nav-mobile li{margin:0;}
.nav-mobile a{
  text-decoration:none;color:var(--ink-soft);font-size:14px;
  display:inline-block;padding-bottom:14px;border-bottom:2px solid transparent;
}
.nav-mobile a.active{color:var(--ink);border-bottom-color:var(--accent);}

@media (min-width:901px){
  .nav-mobile{display:none;}
  .nav-rail{
    display:block;position:fixed;top:50%;left:6vw;width:190px;
    font-size:14px;z-index:20;transform:translateY(-50%);
    background:rgba(255,255,255,0.72);
    -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
    border:1px solid rgba(230,230,226,0.8);border-radius:16px;padding:20px 18px 20px 0;
    opacity:0;pointer-events:none;transition:opacity .35s ease;
  }
  .nav-rail.visible{opacity:1;pointer-events:auto;}
  .nav-rail ol{list-style:none;margin:0;padding:0;}
  .nav-rail li{margin-bottom:4px;}
  .nav-rail li:last-child{margin-bottom:0;}
  .nav-rail a{
    text-decoration:none;color:var(--ink-soft);display:block;
    padding:8px 14px 8px 16px;border-left:3px solid transparent;
    border-radius:0 8px 8px 0;
    transition:color .15s ease, border-color .15s ease, background-color .15s ease;
    font-size:13.5px;
  }
  .nav-rail a:hover{background:var(--artifact-bg);color:var(--ink);}
  .nav-rail a.active{border-left-color:var(--accent);color:var(--ink);}
}

/* ---------- narrow content sections ---------- */
.layout{max-width:1280px;margin:0 auto;padding:0 6vw;}
.content{max-width:720px;}
@media (min-width:901px){.content{margin-left:236px;}}
section{margin:100px 0;scroll-margin-top:110px;}

.section-label{
  font-size:13px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent);font-weight:500;margin-bottom:16px;
}
h2{font-size:clamp(28px,3.2vw,40px);margin-bottom:24px;line-height:1.22;max-width:24ch;}
h3{font-size:19px;margin-bottom:10px;}
p{margin:0 0 18px;color:var(--ink-soft);font-size:16px;}
p.lede{font-size:18px;color:var(--ink);}
strong{color:var(--ink);font-weight:600;}

.findings-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:8px;}
.finding-card{
  background:var(--tint);border-radius:var(--radius);
  padding:22px;font-size:14.5px;line-height:1.55;color:var(--ink);
}
.findings-grid.cols-3{grid-template-columns:repeat(3,1fr);}

/* ---------- zoom badge (used on zoomable image frames) ---------- */
.zoom-badge{
  position:absolute;bottom:20px;right:20px;
  background:rgba(27,33,31,0.82);color:#fff;
  font-size:12.5px;padding:8px 14px;border-radius:100px;
  opacity:0;transform:translateY(6px);
  transition:opacity .2s ease, transform .2s ease;
  pointer-events:none;display:flex;align-items:center;gap:6px;
}
.swim-frame:hover .zoom-badge{opacity:1;transform:translateY(0);}

/* ---------- footer + more case studies ---------- */
footer{
  max-width:1280px;margin:0 auto;padding:60px 6vw 80px;
  border-top:1px solid var(--hairline);font-size:14px;color:var(--ink-soft);
  display:flex;justify-content:space-between;
}
footer a{color:var(--accent);text-decoration:none;}

.more-work{background:var(--tint);border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);}
.more-work-inner{max-width:1280px;margin:0 auto;padding:64px 6vw;}
.more-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:22px;}
.more-card{
  display:flex;flex-direction:column;gap:8px;background:#fff;border:1px solid var(--hairline);
  border-radius:var(--radius);padding:24px;text-decoration:none;transition:border-color .2s ease, transform .2s ease;
}
.more-card:hover{border-color:var(--accent);transform:translateY(-2px);}
.more-client{font-size:11px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;color:var(--accent2);}
.more-title{font-family:'Outfit',sans-serif;font-size:17px;font-weight:500;color:var(--ink);line-height:1.35;}
@media (max-width:760px){.more-grid{grid-template-columns:1fr;}}

/* ---------- lightbox ---------- */
.lightbox{
  position:fixed;inset:0;background:rgba(15,18,17,0.94);
  z-index:100;display:none;align-items:center;justify-content:center;
  overflow:hidden;touch-action:none;
}
.lightbox.open{display:flex;}
/* light variant: for content that's itself light-colored (diagrams, wireframes)
   so the surrounding backdrop matches the section background instead of the
   default near-black, which otherwise reads as a heavy border around light images */
.lightbox.light{background:var(--artifact-bg);}
.lightbox-stage{width:100%;height:100%;overflow:hidden;position:relative;}
.lightbox-stage img{
  position:absolute;top:50%;left:50%;max-width:none;border-radius:3px;
  user-select:none;-webkit-user-drag:none;transform-origin:center center;will-change:transform;
}
.lightbox-close{
  position:absolute;top:24px;right:28px;z-index:110;
  background:rgba(20,20,20,0.7);color:#fff;border:1px solid rgba(255,255,255,0.15);
  width:40px;height:40px;border-radius:50%;font-size:18px;line-height:1;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:0 2px 10px rgba(0,0,0,0.18);
}
.lightbox-caption{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  color:rgba(255,255,255,0.75);font-size:13px;z-index:110;text-align:center;max-width:80vw;
}
.lightbox.light .lightbox-caption{color:rgba(0,0,0,0.6);}
.lightbox-controls{position:absolute;top:24px;left:28px;z-index:110;display:flex;gap:8px;}
.lightbox-controls button{
  background:rgba(20,20,20,0.7);color:#fff;border:1px solid rgba(255,255,255,0.15);
  width:40px;height:40px;border-radius:50%;font-size:18px;line-height:1;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:0 2px 10px rgba(0,0,0,0.18);
}
.lightbox-hint{
  position:absolute;top:24px;left:50%;transform:translateX(-50%);
  color:rgba(255,255,255,0.55);font-size:12.5px;z-index:110;
}
.lightbox.light .lightbox-hint{color:rgba(0,0,0,0.45);}
@media (max-width:600px){.lightbox-hint{display:none;}}

/* ---------- mobile back-to-top ---------- */
.back-to-top{
  position:fixed;bottom:22px;right:18px;z-index:40;
  width:44px;height:44px;border-radius:50%;
  background:rgba(27,33,31,0.55);color:#fff;border:none;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  opacity:0;pointer-events:none;transform:translateY(8px);
  transition:opacity .25s ease, transform .25s ease;
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.back-to-top svg{transform:rotate(90deg);}
.back-to-top.visible{opacity:1;pointer-events:auto;transform:translateY(0);}
@media (min-width:901px){.back-to-top{display:none;}}