@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@400;600;700&display=swap');

:root {
  /* Light Mode Tokens */
  --bg: #f8fafc;
  --panel: rgba(255, 255, 255, 0.75);
  --panel-solid: #ffffff;
  --border: rgba(148, 163, 184, 0.15);
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --accent-hover: #1d4ed8;
  --success: #10b981;
  --success-soft: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-soft: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.1);
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  
  --radius-xl: 24px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', sans-serif;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --panel: rgba(30, 41, 59, 0.7);
  --panel-solid: #1e293b;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.15);
  --accent-hover: #60a5fa;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

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

[hidden] {
  display: none !important;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background-color: var(--bg);
  background-image: 
    radial-gradient(at 0% 0%, var(--accent-soft) 0, transparent 50%),
    radial-gradient(at 100% 0%, var(--success-soft) 0, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  transition: var(--transition);
}

button:active {
  transform: scale(0.98);
}

/* Layout */
.erp-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  max-width: 1600px;
  margin: 0 auto;
  padding: 24px;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: sticky;
  top: 24px;
  height: calc(100vh - 48px);
  box-shadow: var(--shadow);
}

.brand-block .eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.brand-block h1 {
  font-size: 1.5rem;
  color: var(--text);
}

.sidebar-copy {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 500;
  text-align: left;
}

.nav-btn:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.nav-btn.is-active {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

/* Workspace */
.workspace {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.workspace-header {
  background: var(--panel);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 24px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
}

.section-kicker {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 99px;
  display: inline-block;
  margin-bottom: 8px;
}

.workspace-copy {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 12px;
}

/* Components */
.primary-btn {
  background: var(--accent);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.primary-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}

.ghost-btn {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-weight: 500;
}

.ghost-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.danger-btn {
  color: var(--danger) !important;
}

.danger-btn:hover {
  background: var(--danger-soft) !important;
  border-color: var(--danger) !important;
}

/* Cards & Panels */
.panel {
  background: var(--panel);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.summary-card {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}

.summary-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.summary-card p {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.summary-card strong {
  font-size: 1.75rem;
  display: block;
}

.summary-card span {
  font-size: 0.812rem;
  color: var(--text-muted);
  display: block;
  margin-top: 4px;
}

/* Dashboard Layout */
.dashboard-layout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.stack-card {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 12px;
  transition: var(--transition);
}

.stack-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

/* Sites Page */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1fr;
  gap: 24px;
}

.site-card {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  cursor: pointer;
  transition: var(--transition);
}

.site-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.site-card.is-selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 99px;
  text-transform: uppercase;
}

.badge.active { background: var(--success-soft); color: var(--success); }
.badge.vacant { background: var(--warning-soft); color: var(--warning); }
.badge.balance { background: var(--danger-soft); color: var(--danger); }

/* Forms */
.field {
  margin-bottom: 16px;
}

.field span {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.field input, .field select, .field textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--panel-solid);
  color: var(--text);
  transition: var(--transition);
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Health Bar (New Feature) */
.health-bar-container {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  margin-top: 12px;
  overflow: hidden;
}

.health-bar {
  height: 100%;
  background: var(--success);
  transition: width 0.8s ease-out;
}

/* Authentication Screen */
.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}

.auth-card {
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
}

.auth-intro h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

/* Responsive & Mobile Optimization */
@media (max-width: 1024px) {
  .erp-shell {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }
  .sidebar {
    height: auto;
    position: relative;
    top: 0;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    gap: 16px;
    border-radius: var(--radius-lg);
  }
  .sidebar .brand-block .sidebar-copy, 
  .sidebar .brand-block .eyebrow {
    display: none;
  }
  .sidebar .brand-block h1 {
    font-size: 1.1rem;
  }
  .sidebar-nav {
    flex-direction: row;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 4px;
    flex: 1;
    justify-content: flex-end;
  }
  .nav-btn {
    padding: 8px 12px;
    font-size: 0.8rem;
    white-space: nowrap;
    gap: 6px;
  }
  .nav-btn span { font-size: 1rem; }
  .sidebar div[style*="margin-top: auto"] {
    margin-top: 0 !important;
  }
  #sign-out-btn {
    width: auto !important;
    padding: 8px !important;
  }
  #sign-out-btn span { font-size: 1.1rem; }
  #sign-out-btn { font-size: 0; } /* Hide text, show icon on tablet */

  .dashboard-layout, .content-layout {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 640px) {
  body {
    padding-bottom: 20px;
  }
  .erp-shell {
    padding: 8px;
    gap: 12px;
  }
  .workspace-copy {
    display: none;
  }
  .workspace-header {
    padding: 16px;
    gap: 12px;
  }
  .header-actions {
    width: 100%;
  }
  .header-actions button {
    width: 100%;
    padding: 12px;
  }
  .panel {
    padding: 16px;
  }
  .summary-grid {
    grid-template-columns: 1fr !important;
  }
  .sidebar {
    padding: 12px;
    gap: 12px;
    border-radius: var(--radius-md);
  }
  .sidebar-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    width: 100%;
  }
  .nav-btn {
    flex-direction: column;
    padding: 8px 4px;
    font-size: 0.65rem;
    text-align: center;
    gap: 4px;
  }
  .nav-btn span { font-size: 1.25rem; }
  #sign-out-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px !important;
  }
  
  .report-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* Theme Toggle (New) */
#theme-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--panel-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  font-size: 1.25rem;
  cursor: pointer;
}

/* Table Design */
.report-table {
  width: 100%;
  border-collapse: collapse;
}

.report-table th {
  text-align: left;
  padding: 16px;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
}

.report-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.report-table tr:hover {
  background: var(--accent-soft);
}