/* ============================================================
   Design Room — Portfolio (vertical scroll reader)
   ============================================================ */
:root{
  --bg:#0a0a0b;
  --bg-2:#121214;
  --ink:#f3f2ef;
  --muted:#8d8d88;
  --line:rgba(255,255,255,.10);
  --accent:#c8a96a;
  --chrome-bg:rgba(18,18,20,.66);
  --chrome-blur:saturate(160%) blur(14px);
  --page-shadow:0 30px 70px -22px rgba(0,0,0,.7);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-snap-type:y proximity;
  scroll-padding-top:clamp(58px,9vh,86px);
}
body{
  margin:0;min-height:100vh;
  background:
    radial-gradient(120% 80% at 50% -10%, #17171a 0%, var(--bg) 55%) fixed,
    var(--bg);
  color:var(--ink);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
button{font-family:inherit}
a{color:inherit}

/* ---------- Loader ---------- */
#loader{
  position:fixed;inset:0;z-index:90;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;
  background:var(--bg);
  transition:opacity .6s var(--ease),visibility .6s;
}
#loader.hide{opacity:0;visibility:hidden}
.loader-brand{font-size:clamp(1.1rem,4vw,1.7rem);letter-spacing:.42em;font-weight:600;padding-left:.42em}
.loader-sub{color:var(--muted);letter-spacing:.32em;font-size:.7rem;text-transform:uppercase;margin-bottom:1.6rem}
.loader-track{width:min(220px,52vw);height:2px;background:rgba(255,255,255,.12);border-radius:2px;overflow:hidden}
.loader-bar{height:100%;width:0;background:var(--accent);transition:width .3s var(--ease)}

/* ---------- Chrome (top/bottom bars) ---------- */
.chrome{position:fixed;left:0;right:0;z-index:40;transition:opacity .4s var(--ease),transform .4s var(--ease)}
body.idle .chrome{opacity:0;pointer-events:none}
body.idle #topbar{transform:translateY(-12px)}
body.idle #controls{transform:translate(-50%,12px)}

#topbar{
  top:0;display:flex;align-items:center;justify-content:space-between;
  padding:clamp(.6rem,2vw,1rem) clamp(.9rem,3vw,1.6rem);
  background:linear-gradient(to bottom,rgba(10,10,11,.92),rgba(10,10,11,0));
}

/* brand + nav */
.brand-group{display:flex;align-items:center;gap:clamp(.5rem,2vw,1.5rem);position:relative;min-width:0}
.brand{display:flex;align-items:center;text-decoration:none;flex:0 0 auto}
.brand-logo{height:clamp(17px,2.3vw,24px);width:auto;display:block}

.topnav{display:flex;align-items:center;gap:.15rem}
.topnav-item{
  padding:.42rem .72rem;border:0;border-radius:999px;background:transparent;cursor:pointer;
  color:var(--muted);font-size:.8rem;letter-spacing:.05em;white-space:nowrap;
  transition:color .2s,background .2s;
}
.topnav-item:hover{color:var(--ink);background:rgba(255,255,255,.08)}
.topnav-item.active{color:var(--accent)}
.nav-full{display:none}

.nav-toggle{
  display:none;align-items:center;gap:.4rem;cursor:pointer;
  padding:.42rem .8rem;border:1px solid var(--line);border-radius:999px;
  background:var(--chrome-bg);color:var(--ink);font-size:.8rem;letter-spacing:.04em;
  -webkit-backdrop-filter:var(--chrome-blur);backdrop-filter:var(--chrome-blur);
}
.nav-toggle svg{transition:transform .25s var(--ease)}
.nav-toggle[aria-expanded="true"] svg{transform:rotate(180deg)}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .topnav{
    position:absolute;top:calc(100% + 12px);left:0;z-index:50;
    flex-direction:column;align-items:stretch;min-width:248px;gap:.1rem;
    padding:.4rem;border:1px solid var(--line);border-radius:14px;
    background:var(--chrome-bg);-webkit-backdrop-filter:var(--chrome-blur);backdrop-filter:var(--chrome-blur);
    box-shadow:0 16px 44px -14px rgba(0,0,0,.75);
    opacity:0;visibility:hidden;transform:translateY(-6px);
    transition:opacity .2s,visibility .2s,transform .2s;
  }
  .topnav.open{opacity:1;visibility:visible;transform:none}
  .topnav-item{text-align:left;padding:.62rem .8rem;font-size:.88rem}
  .nav-short{display:none}
  .nav-full{display:inline}
}

.top-actions{display:flex;gap:.5rem;flex:0 0 auto}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  border:1px solid var(--line);background:var(--chrome-bg);color:var(--ink);
  -webkit-backdrop-filter:var(--chrome-blur);backdrop-filter:var(--chrome-blur);
  border-radius:999px;cursor:pointer;font-size:.82rem;
  transition:background .2s,border-color .2s,transform .15s,color .2s,opacity .2s;
  -webkit-tap-highlight-color:transparent;
}
.btn:hover{background:rgba(255,255,255,.10);border-color:rgba(255,255,255,.22)}
.btn:active{transform:scale(.95)}
.btn:disabled{opacity:.32;cursor:default}
.btn-ghost{padding:.5rem .9rem}
.btn-ghost svg{opacity:.85}
.btn-icon{width:40px;height:40px;padding:0;font-size:1.3rem;line-height:1}
@media (max-width:560px){
  .btn-ghost span{display:none}
  .btn-ghost{width:40px;height:40px;padding:0;border-radius:999px}
}

/* ---------- Reader / slides ---------- */
#reader{
  position:relative;z-index:10;
  padding:clamp(58px,9vh,86px) 0 clamp(74px,12vh,104px);
  outline:none;
}
.slide{
  position:relative;
  width:min(96vw, calc(86vh * 16 / 9));
  margin:clamp(10px,3.2vh,40px) auto;
  background:#0f0f11;border-radius:5px;overflow:hidden;
  box-shadow:var(--page-shadow);
  scroll-snap-align:center;
}
.slide-img{width:100%;height:100%;object-fit:cover;display:block;background:#101012}

/* link hotspots layered on each page */
.hot{
  position:absolute;display:block;z-index:5;border-radius:3px;
  transition:background .18s,box-shadow .18s;
}
.hot:hover{background:rgba(200,169,106,.16);box-shadow:0 0 0 1px rgba(200,169,106,.5) inset}

/* ---------- Bottom controls ---------- */
#controls{
  bottom:clamp(12px,3vh,26px);left:50%;transform:translateX(-50%);
  right:auto;display:flex;align-items:center;gap:.4rem;
  padding:.4rem;border-radius:999px;
  background:var(--chrome-bg);border:1px solid var(--line);
  -webkit-backdrop-filter:var(--chrome-blur);backdrop-filter:var(--chrome-blur);
  box-shadow:0 10px 40px -12px rgba(0,0,0,.7);
}
#controls .btn-icon{background:transparent;border-color:transparent}
#controls .btn-icon:hover{background:rgba(255,255,255,.10)}
#controls .btn-icon:disabled{background:transparent}
.counter{display:flex;align-items:center;gap:.3rem;padding:0 .5rem;color:var(--muted);font-variant-numeric:tabular-nums;font-size:.9rem}
#pageInput{
  width:2.4em;text-align:center;background:transparent;border:0;border-bottom:1px solid var(--line);
  color:var(--ink);font:inherit;font-variant-numeric:tabular-nums;padding:.1rem 0;outline:none;
}
#pageInput:focus{border-color:var(--accent)}
.counter-sep{opacity:.5}

/* ---------- Overlays (thumbs + zoom) ---------- */
.overlay{
  position:fixed;inset:0;z-index:60;display:none;flex-direction:column;
  background:rgba(8,8,9,.94);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.overlay.open{display:flex;animation:fade .25s var(--ease)}
@keyframes fade{from{opacity:0}to{opacity:1}}
.overlay-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:clamp(.9rem,3vw,1.4rem) clamp(1rem,4vw,2rem);
  letter-spacing:.2em;text-transform:uppercase;font-size:.78rem;color:var(--muted);
  border-bottom:1px solid var(--line);
}

.thumb-grid{
  flex:1;overflow-y:auto;display:grid;gap:clamp(10px,1.6vw,18px);
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  padding:clamp(1rem,3vw,2rem);
}
.thumb{
  position:relative;border:1px solid var(--line);border-radius:6px;overflow:hidden;cursor:pointer;
  background:#101012;aspect-ratio:16/9;transition:border-color .2s,transform .15s;
}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb:hover{border-color:var(--accent);transform:translateY(-2px)}
.thumb.active{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent)}
.thumb-num{
  position:absolute;left:6px;bottom:6px;font-size:.7rem;color:var(--ink);
  background:rgba(0,0,0,.55);padding:.1rem .4rem;border-radius:4px;font-variant-numeric:tabular-nums;
}

/* zoom lightbox */
#zoom{cursor:zoom-out}
.zoom-close{position:absolute;top:clamp(.8rem,3vw,1.4rem);right:clamp(.8rem,3vw,1.4rem);z-index:3;background:var(--chrome-bg)}
.zoom-hint{
  position:absolute;top:clamp(.9rem,3vw,1.4rem);left:50%;transform:translateX(-50%);z-index:2;
  color:var(--muted);font-size:.74rem;letter-spacing:.04em;
  background:var(--chrome-bg);padding:.4rem .8rem;border-radius:999px;border:1px solid var(--line);
  transition:opacity .5s;
}
#zoomViewport{
  flex:1;overflow:hidden;display:flex;align-items:center;justify-content:center;
  touch-action:none;cursor:grab;
}
#zoomViewport.grabbing{cursor:grabbing}
#zoomImg{
  max-width:100%;max-height:100%;object-fit:contain;
  transform-origin:0 0;will-change:transform;user-select:none;-webkit-user-drag:none;
}

/* focus */
:focus:not(:focus-visible){outline:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}