/* Nexus v2 — Design System (SaaS Professional) */
:root {
  /* Core palette — Light theme */
  --color-bg: #f1f5f9;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.78);
  --color-primary: #1e293b;
  --color-primary-light: #334155;
  --color-primary-dark: #0f172a;
  --color-accent: #f59e0b;
  --color-accent-light: #fbbf24;
  --color-accent-dark: #d97706;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-success: #10b981;
  --color-success-bg: #d1fae5;
  --color-success-text: #065f46;
  --color-warning: #f59e0b;
  --color-warning-bg: #fef3c7;
  --color-warning-text: #92400e;
  --color-danger: #ef4444;
  --color-danger-bg: #fee2e2;
  --color-danger-text: #991b1b;
  --color-info: #3b82f6;
  --color-info-bg: #dbeafe;
  --color-info-text: #1e40af;

  /* Dark theme (default) */
  --dark-bg: #0f172a;
  --dark-surface: #1e293b;
  --dark-surface-glass: rgba(30, 41, 59, 0.85);
  --dark-primary: #e2e8f0;
  --dark-primary-light: #cbd5e1;
  --dark-primary-dark: #f1f5f9;
  --dark-accent: #f59e0b;
  --dark-accent-light: #fbbf24;
  --dark-accent-dark: #d97706;
  --dark-text: #e2e8f0;
  --dark-text-secondary: #94a3b8;
  --dark-text-muted: #64748b;
  --dark-border: #334155;
  --dark-border-light: #1e293b;
  --dark-success: #34d399;
  --dark-success-bg: #064e3b;
  --dark-success-text: #6ee7b7;
  --dark-warning: #fbbf24;
  --dark-warning-bg: #78350f;
  --dark-warning-text: #fcd34d;
  --dark-danger: #f87171;
  --dark-danger-bg: #7f1d1d;
  --dark-danger-text: #fca5a5;
  --dark-info: #60a5fa;
  --dark-info-bg: #1e3a5f;
  --dark-info-text: #93c5fd;

  /* Spaces, shadows, radius */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --gap-grid: 0.8rem;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.14);
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.05);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-glass-lg: 0 8px 48px rgba(0, 0, 0, 0.14);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --sidebar-width: 240px;
  --header-height: 3rem;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 120ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
}

/* ── Dark theme (default) ── */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: var(--dark-bg);
    --color-surface: var(--dark-surface);
    --color-surface-glass: var(--dark-surface-glass);
    --color-primary: var(--dark-primary);
    --color-primary-light: var(--dark-primary-light);
    --color-primary-dark: var(--dark-primary-dark);
    --color-text: var(--dark-text);
    --color-text-secondary: var(--dark-text-secondary);
    --color-text-muted: var(--dark-text-muted);
    --color-border: var(--dark-border);
    --color-border-light: var(--dark-border-light);
    --color-success: var(--dark-success);
    --color-success-bg: var(--dark-success-bg);
    --color-success-text: var(--dark-success-text);
    --color-warning: var(--dark-warning);
    --color-warning-bg: var(--dark-warning-bg);
    --color-warning-text: var(--dark-warning-text);
    --color-danger: var(--dark-danger);
    --color-danger-bg: var(--dark-danger-bg);
    --color-danger-text: var(--dark-danger-text);
    --color-info: var(--dark-info);
    --color-info-bg: var(--dark-info-bg);
    --color-info-text: var(--dark-info-text);
  }
}

/* ── Manual dark class toggle (added by JS) ── */
html.dark-theme {
  --color-bg: var(--dark-bg);
  --color-surface: var(--dark-surface);
  --color-surface-glass: var(--dark-surface-glass);
  --color-primary: var(--dark-primary);
  --color-primary-light: var(--dark-primary-light);
  --color-primary-dark: var(--dark-primary-dark);
  --color-text: var(--dark-text);
  --color-text-secondary: var(--dark-text-secondary);
  --color-text-muted: var(--dark-text-muted);
  --color-border: var(--dark-border);
  --color-border-light: var(--dark-border-light);
  --color-success: var(--dark-success);
  --color-success-bg: var(--dark-success-bg);
  --color-success-text: var(--dark-success-text);
  --color-warning: var(--dark-warning);
  --color-warning-bg: var(--dark-warning-bg);
  --color-warning-text: var(--dark-warning-text);
  --color-danger: var(--dark-danger);
  --color-danger-bg: var(--dark-danger-bg);
  --color-danger-text: var(--dark-danger-text);
  --color-info: var(--dark-info);
  --color-info-bg: var(--dark-info-bg);
  --color-info-text: var(--dark-info-text);
  }
}

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

/* Selection */
::selection {
  background: var(--color-accent);
  color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

/* === Login === */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(245, 158, 11, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(16, 185, 129, 0.04) 0%, transparent 50%),
    linear-gradient(135deg, var(--color-bg) 0%, #eef2ff 100%);
  padding: var(--space-lg);
}

.login-card {
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-2xl) var(--space-xl);
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow-glass-lg);
  animation: fadeSlideIn 0.5s var(--ease-out);
  transition: box-shadow var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}
.login-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-1px);
}

.login-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}
.login-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: white;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}
.login-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
}
.login-subtitle {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.input-group {
  margin-bottom: var(--space-md);
}
.input-group .input {
  width: 100%;
}

.error-group.hidden {
  display: none;
}
.error-text {
  color: var(--color-danger);
  font-size: 0.75rem;
  font-weight: 500;
}

/* === Layout === */
.app-layout {
  display: flex;
  height: 100vh;
  animation: fadeIn 0.3s var(--ease-out);
}
.app-layout.hidden {
  display: none;
}

/* === Sidebar === */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: margin-left var(--duration-slow) var(--ease-out), width var(--duration-slow) var(--ease-out);
  z-index: 10;
}

.sidebar-header {
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: white;
  font-size: 1rem;
  transition: transform var(--duration-normal) var(--ease-smooth), box-shadow var(--duration-normal) var(--ease-out);
}
.logo:hover .logo-icon {
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.25);
}
.logo-text {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-sm);
  overflow-y: auto;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
  text-decoration: none;
  border: none;
  width: 100%;
  background: transparent;
  font-family: inherit;
  position: relative;
}
.nav-item:hover {
  background: var(--color-bg);
  color: var(--color-text);
  transform: translateX(2px);
}
.nav-item:active {
  transform: translateX(0);
  background: var(--color-border);
  transition-duration: 40ms;
}
.nav-item.active {
  background: rgba(245, 158, 11, 0.08);
  color: var(--color-accent-dark);
  font-weight: 600;
}
.nav-item .nav-icon {
  font-size: 1rem;
  width: 1.2rem;
  text-align: center;
  flex-shrink: 0;
}
.nav-item .nav-badge {
  margin-left: auto;
  background: var(--color-danger);
  color: white;
  font-size: 0.55rem;
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  line-height: 1.2;
}

.sidebar-footer {
  padding: var(--space-md) var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}
.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  flex-shrink: 0;
}
.user-name {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.btn-logout {
  width: 100%;
}

/* === Main Content === */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  min-height: var(--header-height);
}
.page-header h1 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
}
.header-actions {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.panel-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
}

/* === Module Panel === */
.module-panel {
  animation: slideUp 0.25s var(--ease-out);
}

/* === Card === */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  box-shadow: var(--shadow-card);
  transition:
    box-shadow var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-border-light);
}
.card:active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  transition-duration: 60ms;
}
.card h2 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* === Grid === */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap-grid);
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-grid);
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--gap-grid);
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-grid);
}

/* === Widget === */
.widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition:
    box-shadow var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.widget:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--color-accent);
}
.widget:active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  transition-duration: 60ms;
}
/* Subtle accent glow on hover */
.widget::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.03) 0%, transparent 60%);
  transition: opacity var(--duration-slow) var(--ease-out);
  pointer-events: none;
}
.widget:hover::after {
  opacity: 1;
}
.widget-title {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}
.widget-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.widget-label {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* === Button === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition:
    all var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-smooth);
  border: 1px solid transparent;
  outline: none;
  white-space: nowrap;
  line-height: 1.4;
  text-decoration: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}
.btn:active:not(:disabled) {
  transform: scale(0.97);
  transition-duration: 40ms;
}
.btn:focus-visible {
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-accent);
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
}
.btn-primary:active:not(:disabled) {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}
.btn-accent {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}
.btn-accent:hover:not(:disabled) {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
}
.btn-accent:active:not(:disabled) {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}
.btn-danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}
.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  border-color: #dc2626;
}
.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.65rem;
}
.btn-block {
  width: 100%;
}

/* === Badge === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.45rem;
  border-radius: var(--radius-sm);
  font-size: 0.6rem;
  font-weight: 600;
  line-height: 1.3;
  white-space: nowrap;
}
.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
}
.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}
.badge-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
}
.badge-info {
  background: var(--color-info-bg);
  color: var(--color-info-text);
}
.badge-neutral {
  background: #f1f5f9;
  color: #475569;
}

/* === Input === */
.input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-family: inherit;
  transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
  outline: none;
  background: var(--color-surface);
  color: var(--color-text);
  line-height: 1.5;
}
.input::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}
.input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}
.input-group label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

/* === Toast === */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}
.toast {
  padding: 0.7rem 1rem;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  border-left: 3px solid var(--color-accent);
  font-size: 0.75rem;
  animation: slideIn 0.3s var(--ease-out);
  max-width: 360px;
  pointer-events: auto;
  line-height: 1.5;
  color: var(--color-text);
  transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}
.toast.toast-visible {
  opacity: 1;
  transform: translateX(0);
}
.toast.toast-hiding {
  opacity: 0;
  transform: translateX(100%);
}
.toast.success {
  border-left-color: var(--color-success);
}
.toast.error {
  border-left-color: var(--color-danger);
}
.toast.warning {
  border-left-color: var(--color-warning);
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.15s ease;
  transition: background var(--duration-normal) ease;
}
.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 560px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  animation: scaleIn 0.2s var(--ease-out);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.modal-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

/* === Skeleton === */
.skeleton {
  background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
  height: 1rem;
  margin-bottom: 0.5rem;
}

/* === Overlay (sidebar) === */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.25);
  z-index: 5;
  transition: opacity 0.3s ease;
}
.overlay.hidden {
  display: none;
}

/* === Animations === */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes scaleIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes slideUp {
  from { transform: translateY(12px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* === Splash Screen === */
.splash-screen {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
    linear-gradient(135deg, #f1f5f9 0%, #eef2ff 100%);
  transition: opacity 0.4s ease;
}
.splash-screen.hidden {
  display: none;
}
.splash-screen.splash-fade-out {
  opacity: 0;
  pointer-events: none;
}
.splash-content {
  text-align: center;
  animation: fadeSlideIn 0.6s var(--ease-out);
}
.splash-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: white;
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
  animation: pulse 2s ease-in-out infinite;
}
.splash-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
}
.splash-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}
.splash-loader {
  width: 180px;
  height: 3px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  margin: 0 auto;
  overflow: hidden;
}
.splash-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: var(--radius-full);
  transition: width 0.4s var(--ease-out);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* === Offline Banner === */
.offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 250;
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  text-align: center;
  padding: 0.4rem 1rem;
  font-size: 0.7rem;
  font-weight: 600;
  animation: slideDown 0.3s var(--ease-out);
}
.offline-banner.hidden {
  display: none;
}

@keyframes slideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

/* === Module Error === */
.module-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  color: var(--color-text-secondary);
}
.module-error-icon {
  font-size: 2rem;
}
.module-error p {
  font-size: 0.85rem;
  line-height: 1.6;
}

/* === Panel Loading State === */
.panel-container.panel-loading {
  position: relative;
}
.panel-container.panel-loading::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  background-size: 200% 100%;
  animation: loadingBar 1.2s ease-in-out infinite;
  z-index: 2;
}

@keyframes loadingBar {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* === Sidebar Collapsed (desktop) === */
.sidebar.collapsed {
  width: 0;
  min-width: 0;
  overflow: hidden;
  border-right: none;
}

/* === Nav Separator === */
.nav-separator {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-sm) 0;
}

/* === Nav Category Header === */
.nav-category-header {
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  opacity: 0.5;
  padding: var(--space-md) var(--space-sm) var(--space-xs);
  margin-top: var(--space-sm);
  pointer-events: none;
  user-select: none;
}
.nav-category-header.first {
  margin-top: 0;
}

/* === Hidden utility (applied before JS loads) === */
.hidden {
  display: none !important;
}

/* === Responsive === */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 10;
    margin-left: calc(var(--sidebar-width) * -1);
  }
  .sidebar.open {
    margin-left: 0;
    box-shadow: var(--shadow-xl);
  }
  .grid-2,
  .grid-3,
  .grid-4,
  .grid-12 {
    grid-template-columns: 1fr;
  }
  .page-header {
    padding: var(--space-sm) var(--space-md);
  }
  .panel-container {
    padding: var(--space-md);
  }
}

@media (max-width: 900px) {
  .sidebar.open + .overlay {
    display: block;
  }
}