*{box-sizing:border-box;margin:0;padding:0;}

body{
  background:var(--bg);
  color:var(--t2);
  font-family:var(--font-main);
  font-size:var(--fs-body);
  line-height:1.55;
  min-height:100vh;
  padding-bottom:70px;
  -webkit-font-smoothing:antialiased;
}

/* ---- Typography scale (use these classes on new markup; old inline sizes
   in components.css are left untouched so nothing already built breaks) ---- */
.h1{font-size:var(--fs-h1);font-weight:700;color:var(--text);letter-spacing:-.02em;}
.h2{font-size:var(--fs-h2);font-weight:700;color:var(--text);letter-spacing:-.01em;}
.h3{font-size:var(--fs-h3);font-weight:600;color:var(--text);}
.title{font-size:var(--fs-title);font-weight:600;color:var(--text);}
.body-text{font-size:var(--fs-body);color:var(--t2);}
.small-text{font-size:var(--fs-small);color:var(--t2);}
.caption{font-size:var(--fs-caption);color:var(--t3);text-transform:uppercase;letter-spacing:.04em;}

/* visible keyboard focus everywhere — accessibility floor */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--primary);outline-offset:2px;
}

/* ==========================================================================
   DESKTOP SIDEBAR (Linear-style) — desktop/tablet only. Mobile keeps the
   existing bottom nav (.bnav in components.css), which the brief itself
   recommends for mobile (item 24), so both are kept, each for its own
   breakpoint — no functionality removed, same switchTab() JS drives both.
   ========================================================================== */
.app-sidebar{
  display:none; /* shown from 901px up, see media query below */
  position:fixed;top:0;left:0;bottom:0;
  width:var(--sidebar-w-current, var(--sidebar-w));
  background:var(--surface);
  border-right:var(--border);
  flex-direction:column;
  padding:var(--sp-2) var(--sp-1);
  z-index:300;
  transition:width .2s ease;
}
.app-sidebar.collapsed{width:var(--sidebar-w-collapsed);}
.app-sidebar.resizing{transition:none;}

/* ---- Manual resize handle — drag the sidebar's right edge to set its width ---- */
.sb-resize-handle{
  display:none; /* shown from 901px up alongside the sidebar itself */
  position:absolute;top:0;right:0;bottom:0;
  width:6px;
  cursor:col-resize;
  z-index:301;
  background:transparent;
}
.sb-resize-handle::after{
  content:'';
  position:absolute;top:0;bottom:0;right:2px;
  width:2px;
  background:transparent;
  transition:background .15s ease;
}
.sb-resize-handle:hover::after,
.app-sidebar.resizing .sb-resize-handle::after{background:var(--primary);}
.app-sidebar.collapsed .sb-resize-handle{display:none;}
.sb-logo{
  display:flex;align-items:center;gap:10px;
  padding:var(--sp-1) var(--sp-1) var(--sp-2);
  font-weight:700;font-size:var(--fs-title);color:var(--text);
}
.sb-logo .sb-logo-mark{font-size:20px;line-height:1;flex-shrink:0;}
.app-sidebar.collapsed .sb-logo span.sb-logo-label,
.app-sidebar.collapsed .sb-item span.sb-label{display:none;}

.sb-toggle{
  position:absolute;top:22px;right:-13px;
  width:26px;height:26px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--primary);border:2px solid var(--surface);color:#fff;
  cursor:pointer;z-index:302;padding:0;
  box-shadow:0 2px 6px rgba(0,0,0,.3);
  transition:transform .15s ease;
}
.sb-toggle:hover{transform:scale(1.1);}
.sb-toggle-icon{transition:transform .2s ease;}
.app-sidebar.collapsed .sb-toggle-icon{transform:rotate(180deg);}

.sb-nav{display:flex;flex-direction:column;gap:2px;flex:1;overflow-y:auto;}
.sb-item{
  display:flex;align-items:center;gap:12px;
  padding:10px 12px;border-radius:10px;
  color:var(--t2);font-size:var(--fs-small);font-weight:500;
  cursor:pointer;border:none;background:none;font-family:inherit;
  transition:background .15s ease,color .15s ease;
  text-align:left;width:100%;
}
.sb-item svg{flex-shrink:0;}
.sb-item:hover{background:var(--s2);color:var(--text);}
.sb-item.active{background:var(--primary-bg);color:var(--primary);}
.sb-item.active svg{color:var(--primary);}

.sb-footer{border-top:var(--border);padding-top:var(--sp-1);margin-top:var(--sp-1);}

/* ==========================================================================
   DESKTOP HEADER — greeting, quick stats, primary action, notifications
   ========================================================================== */
.app-header{
  display:none; /* shown from 901px up */
  align-items:center;justify-content:space-between;
  gap:var(--sp-3);
  height:56px;
  padding:0 var(--sp-3);
  background:var(--surface);
  border-bottom:var(--border);
  position:sticky;top:0;z-index:150;
}
.ah-greeting{font-size:var(--fs-small);font-weight:600;color:var(--t2);}
.ah-greeting span{font-weight:700;color:var(--text);}
.ah-stats{display:flex;gap:var(--sp-3);}
.ah-stat{text-align:left;}
.ah-stat .ah-stat-label{font-size:var(--fs-caption);color:var(--t3);text-transform:uppercase;letter-spacing:.04em;}
.ah-stat .ah-stat-val{font-size:var(--fs-title);font-weight:700;color:var(--text);margin-top:2px;}
.ah-actions{display:flex;align-items:center;gap:var(--sp-2);}
.ah-btn-primary{
  height:44px;padding:0 20px;border-radius:var(--radius-btn);
  background:var(--primary);color:#fff;font-weight:600;font-size:var(--fs-small);
  border:none;cursor:pointer;font-family:inherit;
  display:flex;align-items:center;gap:8px;
  transition:transform .2s ease,box-shadow .2s ease;
}
.ah-btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-card);}
.ah-icon-btn{
  width:44px;height:44px;border-radius:var(--radius-btn);
  background:var(--s2);border:var(--border);color:var(--t2);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  position:relative;
}
.ah-icon-btn:hover{color:var(--text);border-color:var(--b2);}
.ah-badge-dot{position:absolute;top:8px;right:8px;width:7px;height:7px;border-radius:50%;background:var(--danger);}

/* ---- Layout shift on desktop: content sits right of sidebar, below header ---- */
@media (min-width:901px){
  .app-sidebar,.app-header{display:flex;}
  .sb-resize-handle{display:block;}
  body{padding-bottom:0;padding-left:var(--sidebar-w-current, var(--sidebar-w));}
  body.sidebar-collapsed{padding-left:var(--sidebar-w-collapsed);}
  .bnav{display:none;} /* bottom nav is mobile-only once sidebar is present */
}