:root{
  --layout-max: 1280px;
  --bar-h: 60px;
  --gap: 14px;
  --radius: 14px;
  --ico: 28px;
  --stroke: 2px;
  --stroke-color: rgba(70,78,95,1);
  --stroke-hover: rgba(190,198,210,1);
  --bg-top:#f8f9fb; --bg-bottom:#eef2f7;
  --safe-t: env(safe-area-inset-top,0px);
  --safe-b: env(safe-area-inset-bottom,0px);

  /* critical: dynamic content edges (set by JS on desktop) */
  --content-left: 50%;   /* fallback */
  --content-right: 50%;  /* fallback */
  --side-gap: 18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial;background:linear-gradient(180deg,var(--bg-top),var(--bg-bottom));color:#0f172a}

/* Bars */
.bar{position:fixed;left:0;right:0;height:var(--bar-h);display:flex;justify-content:center;align-items:center;gap:16px;background:transparent;z-index:60}
.bar--top{top:0}.bar--bottom{bottom:0}

.icon-btn{background:none;border:none;padding:10px;cursor:pointer;border-radius:12px;min-width:44px;min-height:44px}
.icon,.icon *{fill:none}
.icon{width:var(--ico);height:var(--ico);stroke:var(--stroke-color);stroke-width:var(--stroke);stroke-linecap:round;stroke-linejoin:round;filter:drop-shadow(0 1px 3px rgba(0,0,0,.18));transition:transform .12s ease,filter .12s ease,stroke .12s ease}
.icon-btn:hover .icon{transform:translateY(-1px) scale(1.06);filter:drop-shadow(0 3px 8px rgba(0,0,0,.24));stroke:var(--stroke-hover)}

/* Sidebars */
.sidebar{position:fixed;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:12px;background:transparent;z-index:55}

/* Desktop: lock to measured real content edges */
@media (min-width: 1025px){
  .sidebar--left{  left:  calc(var(--content-left)  - var(--side-gap)); }
  .sidebar--right{ right: calc(100vw - var(--content-right) - var(--side-gap)); }
}

/* Mobile/Tablet: rails at edges */
@media (max-width: 1024px){
  .sidebar--left{ left: 6px; }
  .sidebar--right{ right: 6px; }
  .sidebar{ gap:10px; }
  .bar{background:linear-gradient(180deg,rgba(255,255,255,.86),rgba(238,242,247,.82));border:1px solid rgba(120,130,145,.22);backdrop-filter:saturate(1.05) blur(10px);-webkit-backdrop-filter:saturate(1.05) blur(10px);z-index:80}
  .bar--top::after{content:"";position:absolute;left:8px;right:8px;bottom:-10px;height:10px;background:linear-gradient(180deg,rgba(15,23,42,.10),transparent);filter:blur(1px);pointer-events:none}
  .bar--bottom::before{content:"";position:absolute;left:8px;right:8px;top:-10px;height:10px;background:linear-gradient(180deg,transparent,rgba(15,23,42,.10));filter:blur(1px);pointer-events:none}
}

/* Main content */
.main-content{min-height:calc(100vh - 2*var(--bar-h) - var(--safe-t) - var(--safe-b));display:flex;align-items:center;justify-content:center;padding:calc(var(--bar-h) + var(--safe-t) + 8px) 16px calc(var(--bar-h) + var(--safe-b) + 12px)}
.content--boxed{width:100%;max-width:var(--layout-max);display:flex;flex-direction:column;gap:28px;margin-inline:auto}

/* Grids */
.grid{display:grid;gap:var(--gap)}
.grid--6{grid-template-columns:repeat(6,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* Tiles */
.tile{background:linear-gradient(180deg,rgba(255,255,255,.96),rgba(246,248,251,.94));border:1px solid rgba(0,0,0,.06);border-radius:14px;box-shadow:0 12px 22px rgba(0,0,0,.10), inset 0 1px 0 rgba(255,255,255,.65);padding:14px;text-align:center;min-height:110px;transition:transform .12s ease,box-shadow .12s ease}
.tile:hover{transform:translateY(-2px);box-shadow:0 18px 30px rgba(0,0,0,.14)}
.tile__icon .icon{width:26px;height:26px}
.tile__title{font-size:.95rem;font-weight:700;margin:6px 0 2px;color:#0f172a}
.tile__sub{font-size:.82rem;color:#475569;margin:0}

.tile--feature{text-align:left;min-height:130px}
.feature-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.feature-icon .icon{width:22px;height:22px}
.feature-sub{font-size:.9rem;color:#374151;margin:0}

/* Responsive grids */
@media (max-width: 900px){
  .content--boxed{max-width:calc(100vw - 2*(46px + 10px));padding-inline:8px}
  .grid--6{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:1fr}
}
@media (max-width: 480px){ .grid--6{grid-template-columns:1fr} }
@media (min-width:901px) and (max-width:1280px){
  .grid--6{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}