/**
 * SaaS Dashboard Design System
 * Modern CRM-style UI with gradient accents, soft shadows, and clean typography
 */

/* ============================================
   STEP 1 — DESIGN TOKENS (CSS Variables)
   ============================================ */

:root {
  /* BRAND GRADIENT */
  --gradient-primary: linear-gradient(135deg, #6D5BFF 0%, #8E54E9 50%, #4F8CFF 100%);
  --gradient-hover: linear-gradient(135deg, #7D6BFF 0%, #9E64F9 50%, #5F9CFF 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(109, 91, 255, 0.1) 0%, rgba(142, 84, 233, 0.1) 50%, rgba(79, 140, 255, 0.1) 100%);

  /* COLORS */
  --color-primary: #6D5BFF;
  --color-primary-light: #8E54E9;
  --color-accent: #4F8CFF;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-bg: #F5F7FB;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-border: #E5E9F2;
  --color-border-light: #F0F2F5;
  --color-text-dark: #1F2937;
  --color-text: #374151;
  --color-text-light: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-hover-bg: #F9FAFC;

  /* TYPOGRAPHY */
  --font-family-base: 'Inter', 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 20px;
  --font-size-xl: 28px;
  --font-size-2xl: 40px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* SPACING SYSTEM (8px grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* BORDER RADIUS */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* SHADOWS (soft dashboard style) */
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-hover: 0 20px 60px rgba(109, 91, 255, 0.15);
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.06);

  /* TRANSITIONS */
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* LEGACY COMPATIBILITY (map to new vars) */
  --bg: var(--color-bg);
  --surface: var(--color-surface);
  --text: var(--color-text);
  --muted: var(--color-text-light);
  --accent: var(--color-primary);
  --success: var(--color-success);
  --danger: var(--color-danger);
  --stroke: var(--color-border);
  --radius-xl: var(--radius-lg);
  --radius-lg: var(--radius-md);
  --radius-md: var(--radius-sm);
  --shadow-elev: var(--shadow-card);
  --shadow-soft: var(--shadow-sm);
  --glass: var(--color-surface);
  --glass-strong: var(--color-surface-elevated);
}

/* ============================================
   STEP 5 — DARK MODE SUPPORT
   ============================================ */

[data-theme="dark"] {
  --color-bg: #0F172A;
  --color-surface: #1E293B;
  --color-surface-elevated: #334155;
  --color-border: #334155;
  --color-border-light: #475569;
  --color-text-dark: #F9FAFB;
  --color-text: #E5E7EB;
  --color-text-light: #9CA3AF;
  --color-text-muted: #6B7280;
  --color-hover-bg: #1E293B;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ============================================
   BASE STYLES
   ============================================ */

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-family-base);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-bg);
  letter-spacing: -0.01em;
}

/* ============================================
   STEP 2 — COMPONENT STYLING
   ============================================ */

/* 1. CARDS */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

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

.card-elevated {
  background: var(--color-surface-elevated);
  box-shadow: var(--shadow-md);
}

.card-flat {
  box-shadow: none;
  border: 1px solid var(--color-border-light);
}

/* 2. BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  cursor: pointer;
  border: none;
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.05);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(109, 91, 255, 0.35);
}

.btn-primary:hover {
  background: var(--gradient-hover);
  box-shadow: 0 6px 20px rgba(109, 91, 255, 0.45);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--gradient-subtle);
  border-color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  box-shadow: none;
  color: var(--color-text-light);
}

.btn-ghost:hover {
  background: var(--color-hover-bg);
  color: var(--color-text);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.25);
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--font-size-md);
}

/* Button glow effect */
.btn-primary::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: var(--gradient-primary);
  opacity: 0;
  z-index: -1;
  filter: blur(8px);
  transition: opacity var(--transition-smooth);
}

.btn-primary:hover::after {
  opacity: 0.4;
}

/* 3. SIDEBAR */
.sidebar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  color: var(--color-text-light);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.sidebar-item:hover {
  background: var(--color-hover-bg);
  color: var(--color-text);
}

.sidebar-item.active {
  background: var(--gradient-subtle);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.sidebar-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  width: 4px;
  height: 60%;
  background: var(--gradient-primary);
  border-radius: 0 4px 4px 0;
}

/* 4. KPI WIDGETS */
.kpi-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.kpi-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-dark);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

.kpi-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kpi-change {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
}

.kpi-change.positive {
  color: var(--color-success);
  background: rgba(16, 185, 129, 0.1);
}

.kpi-change.negative {
  color: var(--color-danger);
  background: rgba(239, 68, 68, 0.1);
}

/* Mini chart in accent color */
.kpi-chart {
  height: 40px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  opacity: 0.2;
  border-radius: var(--radius-sm);
  margin-top: var(--space-md);
}

/* 5. TABLES */
.table-container {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.table thead {
  background: var(--color-hover-bg);
  border-bottom: 1px solid var(--color-border);
}

.table th {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-light);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.table td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
}

.table tbody tr:hover {
  background: var(--color-hover-bg);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================
   STEP 3 — LAYOUT SYSTEM
   ============================================ */

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.container-narrow {
  max-width: 1000px;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Flex utilities */
.flex {
  display: flex;
}

.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* Spacing utilities */
.m-0 { margin: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }

/* ============================================
   STEP 4 — MICRO INTERACTIONS
   ============================================ */

/* Smooth transitions for interactive elements */
a, button, .card, .sidebar-item {
  transition: all var(--transition-smooth);
}

/* Focus states */
input:focus, textarea:focus, select:focus, button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(109, 91, 255, 0.2);
}

/* Card lift effect */
.card-lift {
  transition: transform var(--transition-bounce), box-shadow var(--transition-smooth);
}

.card-lift:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

/* Button press effect */
.btn-press:active {
  transform: scale(0.98);
}

/* Fade animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.4s var(--transition-smooth) forwards;
}

/* Pulse animation for loading states */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ============================================
   FORM ELEMENTS
   ============================================ */

input, textarea, select {
  width: 100%;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

input:hover, textarea:hover, select:hover {
  border-color: var(--color-border-light);
}

input:focus, textarea:focus, select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(109, 91, 255, 0.15);
}

input::placeholder, textarea::placeholder {
  color: var(--color-text-muted);
}

/* ============================================
   BADGES & STATUS
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
}

.badge-info {
  background: rgba(109, 91, 255, 0.1);
  color: var(--color-primary);
}

/* Status dots */
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.status-dot.online {
  background: var(--color-success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.status-dot.away {
  background: var(--color-warning);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */

@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 24px;
    --space-lg: 16px;
  }

  .container {
    padding: var(--space-md);
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .kpi-value {
    font-size: var(--font-size-xl);
  }

  .table th, .table td {
    padding: var(--space-sm) var(--space-md);
  }

  /* Collapsible sidebar on mobile */
  .sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    height: 100vh;
    width: 280px;
    z-index: 1000;
    transition: left var(--transition-smooth);
  }

  .sidebar.open {
    left: 0;
  }
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  margin-bottom: var(--space-xl);
}

.header h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-dark);
  margin: 0 0 var(--space-sm) 0;
  letter-spacing: -0.02em;
}

.header p {
  font-size: var(--font-size-md);
  color: var(--color-text-light);
  margin: 0;
  max-width: 600px;
}

/* Navigation */
.nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-brand {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-text-dark);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-links {
  display: flex;
  gap: var(--space-sm);
}

.nav-links a {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--color-text-light);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-links a:hover {
  background: var(--color-hover-bg);
  color: var(--color-text);
}

.nav-links a.active {
  background: var(--gradient-subtle);
  color: var(--color-primary);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-sm);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }
}

/* ============================================
   PAGE SHELL
   ============================================ */

.page-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
  padding: var(--space-xl);
}

/* ============================================
   MESSAGES & ALERTS
   ============================================ */

.message {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.message-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.message-error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.message-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

/* ============================================
   ICONS
   ============================================ */

.icon {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  stroke: currentColor;
  fill: none;
  vertical-align: middle;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-text-muted); }
.text-dark { color: var(--color-text-dark); }

.bg-surface { background: var(--color-surface); }
.bg-hover { background: var(--color-hover-bg); }

.border { border: 1px solid var(--color-border); }
.rounded { border-radius: var(--radius-md); }
.shadow { box-shadow: var(--shadow-card); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none; }
.block { display: block; }
.inline-flex { display: inline-flex; }