/* ============================================================
   Magellan Longevity — Stack Builder + One Cart
   Self-contained dark-theme styles for the floating "My Stack"
   button, slide-in panel, and the inline "+ Stack" add buttons.
   Everything is namespaced under .mgs- to avoid collisions with
   the storefront (index.html) and the WebGL universe pages.
   ============================================================ */

/* ---- design tokens (scoped) ---- */
:root{
  --mgs-navy:#0c2730;
  --mgs-navy2:#0e1f27;
  --mgs-panel:#0b1b22;
  --mgs-line:rgba(159,230,227,.22);
  --mgs-line-soft:rgba(159,230,227,.12);
  --mgs-teal:#1f8a8f;
  --mgs-teal-l:#3fd0c9;
  --mgs-mint:#9fe6e3;
  --mgs-gold:#e8a838;
  --mgs-gold-d:#cf8f1f;
  --mgs-ink:#04221f;
  --mgs-text:#eaf6f9;
  --mgs-mut:#a9c4cc;
  --mgs-danger:#ff7a8a;
  --mgs-shadow:0 18px 50px rgba(0,0,0,.45);
}

/* ---- floating launcher button ---- */
.mgs-fab{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:9000;
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:14px;
  font-weight:800;
  letter-spacing:.2px;
  color:#04221f;
  background:linear-gradient(135deg,var(--mgs-teal-l),var(--mgs-teal));
  border:1px solid rgba(255,255,255,.18);
  border-radius:26px;
  padding:11px 17px;
  cursor:pointer;
  box-shadow:0 8px 26px rgba(0,0,0,.32),0 0 0 1px rgba(63,208,201,.18);
  transition:transform .12s ease, box-shadow .12s ease, opacity .2s ease;
}
.mgs-fab:hover{ transform:translateY(-2px); box-shadow:0 12px 32px rgba(0,0,0,.4); }
.mgs-fab:active{ transform:translateY(0); }
.mgs-fab .mgs-fab-ico{ font-size:16px; line-height:1; }
.mgs-fab .mgs-badge{
  background:var(--mgs-ink);
  color:var(--mgs-mint);
  border-radius:11px;
  min-width:20px;
  height:20px;
  font-size:12px;
  font-weight:800;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:0 6px;
  border:1px solid rgba(255,255,255,.12);
}
/* subtle pulse when an item is added */
.mgs-fab.mgs-pulse{ animation:mgs-pulse .5s ease; }
@keyframes mgs-pulse{
  0%{ transform:scale(1); }
  40%{ transform:scale(1.09); }
  100%{ transform:scale(1); }
}

/* ---- backdrop ---- */
.mgs-scrim{
  position:fixed;
  inset:0;
  z-index:9100;
  background:rgba(4,12,15,.55);
  backdrop-filter:blur(3px);
  -webkit-backdrop-filter:blur(3px);
  opacity:0;
  pointer-events:none;
  transition:opacity .25s ease;
}
.mgs-scrim.mgs-on{ opacity:1; pointer-events:auto; }

/* ---- slide-in panel ---- */
.mgs-panel{
  position:fixed;
  top:0;
  right:0;
  z-index:9200;
  width:380px;
  max-width:92vw;
  height:100%;
  display:flex;
  flex-direction:column;
  background:radial-gradient(120% 90% at 90% 0%,var(--mgs-navy) 0%,var(--mgs-panel) 60%,#06141a 100%);
  color:var(--mgs-text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  border-left:1px solid var(--mgs-line);
  box-shadow:var(--mgs-shadow);
  transform:translateX(105%);
  transition:transform .28s cubic-bezier(.4,0,.2,1);
}
.mgs-panel.mgs-on{ transform:translateX(0); }

.mgs-head{
  display:flex;
  align-items:center;
  gap:10px;
  padding:18px 20px 14px;
  border-bottom:1px solid var(--mgs-line-soft);
  flex:0 0 auto;
}
.mgs-head h2{
  margin:0;
  font-size:18px;
  font-weight:800;
  color:#fff;
  flex:1;
  display:flex;
  align-items:center;
  gap:8px;
}
.mgs-head .mgs-count{
  font-size:12px;
  font-weight:700;
  color:var(--mgs-ink);
  background:var(--mgs-mint);
  border-radius:11px;
  padding:2px 9px;
}
.mgs-x{
  width:32px;
  height:32px;
  border-radius:50%;
  border:1px solid var(--mgs-line);
  background:rgba(255,255,255,.04);
  color:var(--mgs-mut);
  font-size:18px;
  line-height:1;
  cursor:pointer;
  flex:0 0 auto;
  transition:background .12s,color .12s;
}
.mgs-x:hover{ background:rgba(255,255,255,.1); color:#fff; }

.mgs-sub{
  padding:10px 20px 0;
  font-size:12.5px;
  color:var(--mgs-mut);
  line-height:1.45;
  flex:0 0 auto;
}

/* ---- item list ---- */
.mgs-list{
  flex:1 1 auto;
  overflow-y:auto;
  padding:12px 16px 8px;
  display:flex;
  flex-direction:column;
  gap:9px;
}
.mgs-item{
  display:flex;
  align-items:flex-start;
  gap:10px;
  background:var(--mgs-navy2);
  border:1px solid var(--mgs-line);
  border-radius:11px;
  padding:11px 12px;
}
.mgs-item .mgs-info{ flex:1; min-width:0; }
.mgs-item .mgs-name{
  display:block;
  color:#fff;
  font-size:14px;
  font-weight:700;
  line-height:1.3;
  word-break:break-word;
}
.mgs-item .mgs-path{
  display:inline-block;
  margin-top:5px;
  font-size:10.5px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.05em;
  color:var(--mgs-mint);
  background:rgba(63,208,201,.1);
  border:1px solid var(--mgs-line-soft);
  border-radius:11px;
  padding:2px 8px;
}
.mgs-item .mgs-open{
  display:block;
  margin-top:7px;
  font-size:12px;
  font-weight:700;
  color:var(--mgs-mint);
  text-decoration:none;
}
.mgs-item .mgs-open:hover{ text-decoration:underline; }
.mgs-rm{
  flex:0 0 auto;
  width:26px;
  height:26px;
  border-radius:50%;
  border:1px solid var(--mgs-line-soft);
  background:transparent;
  color:var(--mgs-mut);
  font-size:14px;
  line-height:1;
  cursor:pointer;
  transition:background .12s,color .12s,border-color .12s;
}
.mgs-rm:hover{ background:rgba(255,122,138,.12); color:var(--mgs-danger); border-color:rgba(255,122,138,.4); }

/* ---- empty state ---- */
.mgs-empty{
  text-align:center;
  color:var(--mgs-mut);
  font-size:13.5px;
  line-height:1.55;
  padding:46px 24px;
}
.mgs-empty .mgs-empty-ico{ font-size:34px; display:block; margin-bottom:10px; opacity:.8; }

/* ---- footer actions ---- */
.mgs-foot{
  flex:0 0 auto;
  padding:14px 16px calc(14px + env(safe-area-inset-bottom,0px));
  border-top:1px solid var(--mgs-line-soft);
  display:flex;
  flex-direction:column;
  gap:9px;
  background:rgba(4,12,15,.35);
}
.mgs-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  width:100%;
  border-radius:23px;
  padding:12px;
  font-size:14px;
  font-weight:800;
  cursor:pointer;
  border:1px solid transparent;
  font-family:inherit;
  transition:filter .12s,background .12s,transform .1s;
}
.mgs-btn:active{ transform:translateY(1px); }
.mgs-btn-primary{
  background:linear-gradient(135deg,var(--mgs-gold),var(--mgs-gold-d));
  color:#3a2a05;
  border-color:var(--mgs-gold-d);
}
.mgs-btn-primary:hover{ filter:brightness(1.05); }
.mgs-btn-primary[disabled]{ opacity:.45; cursor:not-allowed; }
.mgs-btn-ghost{
  background:rgba(255,255,255,.05);
  color:var(--mgs-mint);
  border-color:var(--mgs-line);
}
.mgs-btn-ghost:hover{ background:rgba(255,255,255,.1); }
.mgs-btn-ghost[disabled]{ opacity:.4; cursor:not-allowed; }
.mgs-foot-note{
  font-size:10.5px;
  color:var(--mgs-mut);
  text-align:center;
  line-height:1.4;
  margin-top:2px;
}

/* ---- inline "+ Stack" buttons injected next to product links ---- */
.mgs-add{
  display:inline-flex;
  align-items:center;
  gap:5px;
  vertical-align:middle;
  margin:6px 6px 0 0;
  padding:5px 11px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:12px;
  font-weight:800;
  line-height:1.1;
  color:var(--mgs-mint);
  background:rgba(31,138,143,.16);
  border:1px solid var(--mgs-line);
  border-radius:16px;
  cursor:pointer;
  white-space:nowrap;
  transition:background .12s,color .12s,border-color .12s,transform .1s;
}
.mgs-add:hover{ background:rgba(31,138,143,.3); color:#fff; }
.mgs-add:active{ transform:scale(.96); }
.mgs-add.mgs-in{
  color:#bdf3d6;
  background:rgba(91,224,138,.16);
  border-color:rgba(91,224,138,.4);
}
.mgs-add .mgs-add-ico{ font-size:12px; line-height:1; }

/* light-surface variant: index.html product cards / PDP sit on white,
   so a button that lands inside .card / .buybox / .pbcard gets a darker
   outline for contrast. */
.card .mgs-add,
.buybox .mgs-add,
.pbcard .mgs-add,
.stkshopr .mgs-add,
.qrec .mgs-add{
  color:var(--mgs-teal,#156b6f);
  background:rgba(31,138,143,.1);
  border-color:rgba(31,138,143,.35);
}
.card .mgs-add:hover,
.buybox .mgs-add:hover,
.pbcard .mgs-add:hover,
.stkshopr .mgs-add:hover,
.qrec .mgs-add:hover{ color:#0b4d50; background:rgba(31,138,143,.2); }
.card .mgs-add.mgs-in,
.buybox .mgs-add.mgs-in,
.pbcard .mgs-add.mgs-in,
.stkshopr .mgs-add.mgs-in,
.qrec .mgs-add.mgs-in{ color:#1f8a52; background:rgba(91,224,138,.16); border-color:rgba(91,224,138,.45); }

/* on a product card, the "View on Amazon" anchor is full-width; make the
   stack button sit neatly under it */
.card .mgs-add{ width:100%; justify-content:center; margin:8px 0 0; }

/* ---- toast (panel uses storefront toast when present, else this) ---- */
.mgs-toast{
  position:fixed;
  bottom:78px;
  left:50%;
  transform:translateX(-50%) translateY(80px);
  z-index:9300;
  background:#04221f;
  color:#fff;
  padding:11px 19px;
  border-radius:30px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:13.5px;
  font-weight:700;
  box-shadow:0 10px 34px rgba(0,0,0,.4);
  border:1px solid rgba(159,230,227,.25);
  opacity:0;
  pointer-events:none;
  transition:transform .25s ease,opacity .25s ease;
}
.mgs-toast.mgs-on{ transform:translateX(-50%) translateY(0); opacity:1; }

/* ---- small screens ---- */
@media(max-width:480px){
  .mgs-panel{ width:100%; max-width:100%; }
  .mgs-fab{ right:12px; bottom:12px; padding:10px 14px; font-size:13px; }
}

/* respect reduced-motion */
@media(prefers-reduced-motion:reduce){
  .mgs-panel,.mgs-scrim,.mgs-fab,.mgs-toast{ transition:none; }
  .mgs-fab.mgs-pulse{ animation:none; }
}