/* ==========================================================================
   NeuroPsico Lab - Design System & Modern Theme (Día / Noche)
   ========================================================================== */

:root,
[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-secondary: #f1f5f9;
  --bg-surface-elevated: #ffffff;
  --bg-input: #ffffff;
  --bg-input-focus: #f0fdf4;
  --bg-toolbar: #f8fafc;
  --bg-dropzone: #f8fafc;
  --bg-dropzone-hover: #eff6ff;
  --bg-header: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  
  --border-color: #e2e8f0;
  --border-color-strong: #cbd5e1;
  --border-color-focus: #2563eb;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-active: #1e40af;
  --primary-subtle: #eff6ff;
  --primary-text: #1d4ed8;
  
  --accent: #8b5cf6;
  --accent-hover: #7c3aed;
  
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-text: #065f46;
  
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --warning-text: #92400e;
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-bg: #fef2f2;
  --danger-text: #991b1b;
  
  --info: #0ea5e9;
  --info-bg: #f0f9ff;
  --info-text: #0369a1;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  
  --toggle-bg: #e2e8f0;
  --toggle-border: #cbd5e1;
  --toggle-text: #334155;
  --toggle-hover: #cbd5e1;

  --scrollbar-track: #f1f5f9;
  --scrollbar-thumb: #cbd5e1;
  --scrollbar-thumb-hover: #94a3b8;
  
  --chart-bg: #ffffff;
  --chart-grid: #e2e8f0;
  --chart-text: #1e293b;
  --chart-text-muted: #64748b;
  --chart-line: #2563eb;
  --chart-point: #2563eb;
  --chart-zone-normal: rgba(16, 185, 129, 0.08);
  --chart-zone-limit: rgba(245, 158, 11, 0.08);
  --chart-zone-clinical: rgba(239, 68, 68, 0.08);
}

[data-theme="dark"] {
  --bg-app: #0b0f17;
  --bg-card: #151c28;
  --bg-card-secondary: #1a2332;
  --bg-surface-elevated: #1f293d;
  --bg-input: #101622;
  --bg-input-focus: #132238;
  --bg-toolbar: #131924;
  --bg-dropzone: #101622;
  --bg-dropzone-hover: #1e293b;
  --bg-header: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  
  --border-color: #243042;
  --border-color-strong: #334155;
  --border-color-focus: #3b82f6;
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #8292a6;
  --text-inverse: #0f172a;
  
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-active: #93c5fd;
  --primary-subtle: rgba(59, 130, 246, 0.15);
  --primary-text: #60a5fa;
  
  --accent: #a78bfa;
  --accent-hover: #c4b5fd;
  
  --success: #34d399;
  --success-bg: rgba(16, 185, 129, 0.15);
  --success-text: #6ee7b7;
  
  --warning: #fbbf24;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --warning-text: #fde68a;
  
  --danger: #f87171;
  --danger-hover: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-text: #fca5a5;
  
  --info: #38bdf8;
  --info-bg: rgba(14, 165, 233, 0.15);
  --info-text: #7dd3fc;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  
  --toggle-bg: #1e293b;
  --toggle-border: #334155;
  --toggle-text: #f8fafc;
  --toggle-hover: #334155;

  --scrollbar-track: #101622;
  --scrollbar-thumb: #243042;
  --scrollbar-thumb-hover: #38495f;
  
  --chart-bg: #101622;
  --chart-grid: #1e293b;
  --chart-text: #f8fafc;
  --chart-text-muted: #8292a6;
  --chart-line: #38bdf8;
  --chart-point: #60a5fa;
  --chart-zone-normal: rgba(16, 185, 129, 0.12);
  --chart-zone-limit: rgba(245, 158, 11, 0.12);
  --chart-zone-clinical: rgba(239, 68, 68, 0.12);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Links */
a {
  color: var(--primary-text);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Top App Header & Navbar */
.app-header {
  background: var(--bg-header);
  color: #ffffff;
  padding: 16px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  z-index: 1000;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  font-size: 2rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.brand-info h1 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.2;
  color: #ffffff;
}

.brand-info .app-subtitle {
  font-size: 0.825rem;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.nav-and-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.9);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: all 0.2s ease;
  text-decoration: none !important;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  transform: translateY(-1px);
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--toggle-bg);
  color: var(--toggle-text);
  border: 1px solid var(--toggle-border);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  user-select: none;
}

.theme-toggle-btn:hover {
  background: var(--toggle-hover);
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

.theme-toggle-btn .theme-icon {
  font-size: 1.1rem;
  line-height: 1;
}

/* Unified Buttons */
.btn-primary,
.btn-secondary,
.btn-danger,
.btn-success,
.btn-filter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.925rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none !important;
  border: 1px solid transparent;
  line-height: 1.4;
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #ffffff;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color-strong);
}
.btn-secondary:hover {
  background: var(--bg-card-secondary);
  border-color: var(--primary);
  color: var(--primary-text);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-color: var(--danger);
}
.btn-danger:hover {
  background: var(--danger);
  color: #ffffff;
  transform: translateY(-1px);
}

/* Badges */
.scale-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 6px;
  font-size: 0.775rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--bg-card-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.scale-badge[data-scale="ci"],
.scale-ci {
  background: rgba(37, 99, 235, 0.15);
  color: #2563eb;
  border-color: rgba(37, 99, 235, 0.3);
}
[data-theme="dark"] .scale-badge[data-scale="ci"],
[data-theme="dark"] .scale-ci {
  color: #60a5fa;
}

.scale-badge[data-scale="t"],
.scale-t {
  background: rgba(139, 92, 246, 0.15);
  color: #7c3aed;
  border-color: rgba(139, 92, 246, 0.3);
}
[data-theme="dark"] .scale-badge[data-scale="t"],
[data-theme="dark"] .scale-t {
  color: #a78bfa;
}

.scale-badge[data-scale="scalar"],
.scale-scalar {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
  border-color: rgba(16, 185, 129, 0.3);
}
[data-theme="dark"] .scale-badge[data-scale="scalar"],
[data-theme="dark"] .scale-scalar {
  color: #34d399;
}

.scale-badge[data-scale="decatipo"],
.scale-decatipo {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
  border-color: rgba(245, 158, 11, 0.3);
}
[data-theme="dark"] .scale-badge[data-scale="decatipo"],
[data-theme="dark"] .scale-decatipo {
  color: #fbbf24;
}

.scale-badge[data-scale="percentile"],
.scale-percentile {
  background: rgba(14, 165, 233, 0.15);
  color: #0284c7;
  border-color: rgba(14, 165, 233, 0.3);
}
[data-theme="dark"] .scale-badge[data-scale="percentile"],
[data-theme="dark"] .scale-percentile {
  color: #38bdf8;
}

.battery-tag,
.battery-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.775rem;
  font-weight: 600;
  background: var(--primary-subtle);
  color: var(--primary-text);
  border: 1px solid var(--border-color);
}

.age-range {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--bg-card-secondary);
  color: var(--text-muted);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: 8px;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* Focus styles */
input:focus, select:focus, button:focus, textarea:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}