/* @gobbonet-split css/02-layout.css
   Moved verbatim from style.css lines 133-266.
   layout, sidebar, buttons
   Load order is a contract -- see REFACTOR-PLAN.md before reordering.
   @end-split-header */
/* ========================================================
   LAYOUT & SIDEBAR
======================================================== */
#app { display: flex; height: 100vh; height: 100dvh; overflow: hidden; }

#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: linear-gradient(180deg, var(--surface) 0%, var(--black) 100%);
  border-right: 1px solid var(--border);
  box-shadow: 5px 0 15px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition), opacity var(--transition);
  z-index: 10;
}
#sidebar.collapsed {
  margin-left: calc(-1 * var(--sidebar-w));
  opacity: 0;
  pointer-events: none;
}

/* Sidebar header row: title + close button */
.sidebar-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

/* Close button — hidden on desktop, shown on mobile */
.sidebar-close-btn {
  display: none;
  background: rgba(255, 0, 60, 0.08);
  border: 1px solid var(--red-neon);
  color: var(--red-neon);
  font-size: 22px;
  font-family: var(--font);
  font-weight: 700;
  line-height: 1;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}
.sidebar-close-btn:hover {
  background: var(--red-neon);
  color: var(--white);
  box-shadow: var(--glow-red);
}

/* Sidebar overlay — clickable backdrop for mobile */
#sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.sidebar-header {
  padding: 20px 14px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 243, 255, 0.02);
}
.sidebar-header h1 {
  font-size: 16px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0;
  letter-spacing: 3px;
  text-transform: uppercase;
  animation: crt-flicker 4s infinite;
}
.sidebar-header h1::before { content: "█ "; color: var(--cyan-bright); text-shadow: var(--glow-text-c); }

/* ========================================================
   BUTTONS
======================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--cyan-dim);
  border-radius: var(--radius);
  background: rgba(0, 243, 255, 0.05);
  color: var(--cyan-bright);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-shadow: 0 0 3px rgba(0, 243, 255, 0.3);
}
.btn:hover, .btn:focus-visible { 
  background: rgba(0, 243, 255, 0.15); 
  border-color: var(--cyan-bright); 
  box-shadow: var(--glow-cyan); 
  color: var(--white);
  transform: translateY(-1px);
}
.btn-fill { 
  background: var(--cyan-dim); 
  color: var(--white); 
  border-color: var(--cyan-bright);
}
.btn-fill:hover, .btn-fill:focus-visible { 
  background: var(--cyan-bright); 
  color: var(--black); 
  text-shadow: none;
}
.btn-danger { border-color: var(--red-neon); color: var(--red-neon); text-shadow: 0 0 4px rgba(255, 0, 60, 0.5); }
.btn-danger:hover { background: var(--red-neon); color: var(--white); box-shadow: var(--glow-red); text-shadow: none; }

/* Repurposing .btn-amber to Magenta (No more orange!) */
.btn-amber { border-color: var(--magenta); color: var(--magenta); text-shadow: var(--glow-text-m); }
.btn-amber:hover { background: rgba(217, 0, 255, 0.15); color: var(--white); box-shadow: var(--glow-magenta); }

.btn-block { width: 100%; }
.btn-sm { padding: 5px 10px; font-size: 12px; }