:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(15, 23, 42, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', sans-serif; }

body {
  background: var(--bg-dark);
  background-image: 
    radial-gradient(at 0% 0%, rgba(79, 70, 229, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(56, 189, 248, 0.1) 0px, transparent 50%);
  color: var(--text-main); min-height: 100vh; display: flex; flex-direction: column;
}

#app { width: 100%; flex-grow: 1; display: flex; flex-direction: column; }

/* Glassmorphism Classes */
.glass-panel {
  background: var(--glass-bg); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border); box-shadow: var(--glass-shadow); border-radius: 16px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in { animation: fadeIn 0.4s ease-out forwards; }

/* Form Elements */
.input-group { margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; }
.input-group label { font-size: 0.875rem; color: var(--text-muted); font-weight: 500; }
.input-group input, .input-group select {
  width: 100%; background: #1e293b; border: 1px solid var(--border);
  border-radius: 8px; padding: 0.75rem 1rem; color: var(--text-main); font-size: 1rem;
  transition: all 0.3s ease; outline: none;
  color-scheme: dark; 
}
.input-group input:focus, .input-group select:focus {
  border-color: var(--primary); box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.2);
}

/* Custom Elite Select */
.custom-select-container { position: relative; width: 100%; }
.custom-select-trigger {
  width: 100%; background: #1e293b; border: 1px solid var(--border);
  border-radius: 8px; padding: 0.75rem 1rem; color: var(--text-main); font-size: 1rem;
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  transition: all 0.2s ease;
}
.custom-select-trigger:hover { border-color: var(--primary); }
.custom-select-trigger::after {
  content: '▼'; font-size: 0.7rem; color: var(--text-muted); transition: transform 0.2s;
}
.custom-select-container.open .custom-select-trigger::after { transform: rotate(180deg); }

.custom-select-options {
  position: absolute; top: calc(100% + 5px); left: 0; right: 0;
  background: #1e293b; border: 1px solid var(--primary); border-radius: 12px;
  z-index: 1000; display: none; overflow: hidden;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5); backdrop-filter: blur(10px);
}
.custom-select-container.open .custom-select-options { display: block; animation: selectFade 0.2s ease; }

@keyframes selectFade { from { opacity:0; transform: translateY(-5px); } to { opacity:1; transform: translateY(0); } }

.custom-option {
  padding: 0.8rem 1.2rem; cursor: pointer; color: var(--text-main); font-size: 0.95rem;
  transition: background 0.2s; border-bottom: 1px solid rgba(255,255,255,0.03);
}
.custom-option:last-child { border-bottom: none; }
.custom-option:hover { background: var(--primary); }
.custom-option.selected { background: rgba(79, 70, 229, 0.2); color: var(--primary); font-weight: 600; }

.btn {
  background: var(--primary); color: white; border: none; padding: 0.75rem 1.5rem;
  border-radius: 8px; font-weight: 600; cursor: pointer; transition: all 0.2s ease; width: 100%;
}
.btn:hover { background: var(--primary-hover); transform: translateY(-1px); }

/* Login View */
.login-container { display: flex; height: 100vh; justify-content: center; align-items: center; }
.login-box { width: 100%; max-width: 400px; padding: 2.5rem; }
.login-header { text-align: center; margin-bottom: 2rem; }
.login-header h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.5rem; }
.login-header p { color: var(--text-muted); font-size: 0.875rem; }
.error-message { color: var(--danger); font-size: 0.875rem; margin-top: 1rem; text-align: center; min-height: 1.2rem; }

/* Dashboard Layout (Top Navigation) */
.dashboard-layout { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }

/* Topbar Header */
.topbar {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
  padding: 1rem 2rem; background: var(--bg-card); border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.topbar-brand h2 { font-size: 1.25rem; color: white; margin: 0; }
.user-profile { display: flex; align-items: center; gap: 1rem; }
.user-details { display: flex; flex-direction: column; text-align: right; }
.user-name { font-weight: 600; color: var(--text-main); font-size: 0.95rem; }
.user-role { color: var(--text-muted); font-size: 0.75rem; text-transform: capitalize; margin-top: 2px;}

/* Custom Logout btn matching top menu */
.btn-logout {
  background: transparent; border: 1px solid var(--border); color: var(--text-muted);
  border-radius: 8px; width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.2s ease;
}
.btn-logout:hover { background: rgba(239, 68, 68, 0.1); color: var(--danger); border-color: var(--danger); }

/* Top Navigation Tabs */
.top-nav-links {
  display: flex; overflow-x: auto; background: var(--bg-card); border-bottom: 1px solid var(--border);
  padding: 0 1.5rem; gap: 0.5rem;
  flex-shrink: 0;
  /* hide scrollbar for elegance */
  -ms-overflow-style: none; scrollbar-width: none;
}
.top-nav-links::-webkit-scrollbar { display: none; }
.nav-item {
  display: flex; align-items: center; padding: 1rem 1.2rem; color: var(--text-muted);
  text-decoration: none; cursor: pointer; transition: all 0.2s ease;
  border-bottom: 3px solid transparent; font-weight: 500; font-size: 0.9rem; white-space: nowrap;
}
.nav-item:hover, .nav-item.active {
  color: var(--text-main); border-bottom: 3px solid var(--primary);
  background: rgba(255, 255, 255, 0.03); border-top-left-radius: 8px; border-top-right-radius: 8px;
}

/* Main Content Area */
.main-wrapper { flex-grow: 1; padding: 1.5rem 2rem; overflow-y: auto; }

.tab-header { margin-bottom: 1.5rem; display: flex; justify-content: space-between; align-items: flex-end;}
.tab-header h1 { font-size: 1.8rem; font-weight: 700; margin-bottom: 0.2rem;}

/* CSV Upload Area */
.upload-area {
  border: 2px dashed var(--border); border-radius: 12px; padding: 3rem; text-align: center;
  background: rgba(15, 23, 42, 0.3); transition: all 0.3s ease; margin-bottom: 2rem;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary); background: rgba(79, 70, 229, 0.1);
}
.upload-area p { color: var(--text-muted); margin-bottom: 1rem; }
.upload-btn { background: var(--bg-card); color: var(--text-main); display: inline-block; padding: 0.5rem 1.5rem; border-radius: 6px; cursor: pointer; border: 1px solid var(--border); }
.upload-btn:hover { background: var(--primary); border-color: var(--primary); }

/* KPI Cards */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.kpi-card { padding: 1.5rem; border-radius: 12px; background: rgba(30, 41, 59, 0.5); border: 1px solid var(--border); display: flex; flex-direction: column; }
.kpi-title { font-size: 0.875rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; margin-bottom: 0.5rem; }
.kpi-value { font-size: 2rem; font-weight: 700; color: var(--text-main); }
.kpi-subtitle { font-size: 0.75rem; color: var(--success); margin-top: 0.5rem; }

/* Charts & Dashboard Body */
.dashboard-body { display: grid; grid-template-columns: 1fr; gap: 2rem; margin-bottom: 2rem; }
@media(min-width: 1024px) {
  .dashboard-body { grid-template-columns: 350px 1fr; }
}
.chart-container { background: rgba(30, 41, 59, 0.5); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; display: flex; justify-content: center; align-items: center; min-height: 300px; }
.chart-container canvas { max-width: 100%; max-height: 300px;}

/* Data Table */
.data-table-container { width: 100%; overflow-x: auto; background: rgba(30, 41, 59, 0.5); border: 1px solid var(--border); border-radius: 12px; border-bottom-left-radius: 0; border-bottom-right-radius: 0;}
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th { font-weight: 600; color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; background: rgba(15, 23, 42, 0.6); position: sticky; top: 0; z-index: 10;}
.data-table tr:hover td { background: rgba(255, 255, 255, 0.02); }

.status-badge { padding: 0.25rem 0.75rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.status-pending { background: rgba(234, 179, 8, 0.2); color: #fde047; }
.status-completed { background: rgba(34, 197, 94, 0.2); color: #86efac; }
.status-issue { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }

/* Sub-Navigation Tabs */
.sub-nav-item {
  display: inline-flex; align-items: center; padding: 0.6rem 1.2rem;
  cursor: pointer; font-size: 0.875rem; font-weight: 500;
  color: var(--text-muted); text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  border-radius: 8px 8px 0 0;
}
.sub-nav-item:hover {
  color: var(--primary) !important;
  border-bottom-color: var(--primary) !important;
  background: rgba(79, 70, 229, 0.08);
}
.sub-nav-item.active, .sub-nav-item[style*="var(--primary)"] {
  color: var(--primary) !important;
  border-bottom: 2px solid var(--primary) !important;
}

/* Config sub-buttons (Usuarios / Permisos / LOG) */
.config-sub-btn:hover {
  background: rgba(79, 70, 229, 0.15) !important;
  color: var(--text-main) !important;
}
.stock-sub-btn:hover {
  background: rgba(79, 70, 229, 0.15) !important;
  color: var(--text-main) !important;
}