/* ── Header ──
   Background: franja sólida en #03404C (color REAL sampleado del PNG
   `assets/core-turing-logo.png` con PIL — la IA del diseñador entrega
   variaciones cercanas a #00404A pero no exactas). El stop a 900px
   cubre el ancho del logo banner (ratio 9.24:1, altura 96px → ancho
   ~887px). Si el diseñador entrega un logo con bg distinto, re-samplear
   con `python -c "from PIL import Image; print(Image.open('assets/core-turing-logo.png').getpixel((5,5)))"`
   y actualizar el hex del primer stop. */
.header{background:linear-gradient(to right,#03404C 0,#03404C 540px,var(--core-primary-dark) 100%);color:#fff;padding:.5rem 2rem;display:flex;align-items:center;gap:1rem;box-shadow:0 2px 12px rgba(0,64,74,.25);position:relative;z-index:110}
.header h1{font-size:1.15rem;font-weight:800}
.header p{font-size:.8rem;opacity:.75;margin-top:.1rem}
.header-right{margin-left:auto;display:flex;align-items:center;gap:.5rem;flex-shrink:0}
.btn-header{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);color:rgba(255,255,255,.45);padding:.4rem .85rem;border-radius:var(--core-radius-sm);font-size:.78rem;font-weight:700;font-family:var(--core-font-sans);cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:.35rem;white-space:nowrap}
.btn-header:hover{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.22);color:#fff}
.btn-header-dim{opacity:.5;pointer-events:none}

/* ── Sidebar Admin ── */
.sidebar-overlay{position:fixed;inset:0;background:rgba(0,20,24,.45);z-index:299;opacity:0;pointer-events:none;transition:opacity .3s}
.sidebar-overlay.visible{opacity:1;pointer-events:auto}
.sidebar{position:fixed;top:0;left:0;width:420px;min-width:280px;max-width:80vw;height:100vh;background:var(--core-surface);border-right:1px solid var(--core-border);box-shadow:4px 0 24px rgba(0,64,74,.12);z-index:300;transform:translateX(-100%);transition:transform .3s cubic-bezier(.4,0,.2,1);overflow:visible;display:flex;flex-direction:column}
.sidebar.open{transform:translateX(0)}
.sidebar.resizing{transition:none;user-select:none}
.sidebar-resize{position:absolute;top:0;right:-4px;width:8px;height:100%;cursor:col-resize;z-index:301;background:transparent}
.sidebar-resize:hover,.sidebar-resize.active{background:var(--core-teal);opacity:.3}
.sidebar-head{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;border-bottom:1px solid var(--core-border);background:linear-gradient(135deg,var(--core-primary),var(--core-primary-dark));color:#fff;flex-shrink:0}
.sidebar-head-title{font-size:.95rem;font-weight:800;display:flex;align-items:center;gap:.5rem}
.sidebar-close{background:none;border:none;color:rgba(255,255,255,.6);cursor:pointer;font-size:1.3rem;padding:.25rem;border-radius:4px;transition:color .15s}
.sidebar-close:hover{color:#fff}
.sidebar-body{flex:1;overflow-y:auto;padding:.75rem 0}
.sidebar-section{border-bottom:1px solid var(--core-border)}
.sidebar-section:last-child{border-bottom:none}
.sidebar-section-btn{width:100%;background:none;border:none;padding:.75rem 1.25rem;display:flex;align-items:center;gap:.6rem;cursor:pointer;font-family:var(--core-font-sans);font-size:.82rem;font-weight:700;color:var(--core-text);transition:background .15s}
.sidebar-section-btn:hover{background:var(--core-surface-subtle)}
.sidebar-section-btn .ms{font-size:1.15rem;color:var(--core-text-muted)}
.sidebar-section-btn .sidebar-chevron{margin-left:auto;font-size:.9rem;color:var(--core-text-muted);transition:transform .2s}
.sidebar-section-btn.active .sidebar-chevron{transform:rotate(180deg)}
.sidebar-section-content{display:none;padding:.5rem 1.25rem 1rem}
.sidebar-section-content.open{display:block}
.sidebar-section-label{font-size:.68rem;font-weight:700;color:var(--core-text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:.5rem}
.sidebar-admin-badge{font-size:.58rem;background:rgba(0,169,153,.15);color:var(--core-teal);padding:.1rem .4rem;border-radius:3px;font-weight:700;margin-left:auto}
.sidebar-btn{width:100%;background:none;border:none;padding:.65rem 1.25rem;display:flex;align-items:center;gap:.6rem;cursor:pointer;font-family:var(--core-font-sans);font-size:.82rem;font-weight:600;color:var(--core-text);transition:background .15s}
.sidebar-btn:hover{background:var(--core-surface-subtle)}
.sidebar-btn .ms{font-size:1.15rem;color:var(--core-text-muted)}
.sidebar-btn-dim{opacity:.45;pointer-events:none}