/* ============================================
   GLOBAL STYLES & CSS VARIABLES
   ============================================ */

:root {
  /* Colors */
  --color-primary: #667eea;
  --color-secondary: #764ba2;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Dark Theme */
  --color-bg-primary-dark: #1f2937;
  --color-bg-secondary-dark: #111827;
  --color-bg-tertiary-dark: #374151;
  --color-text-primary-dark: #f3f4f6;
  --color-text-secondary-dark: #d1d5db;
  --color-border-dark: #4b5563;

  /* Light Theme */
  --color-bg-primary-light: #ffffff;
  --color-bg-secondary-light: #f9fafb;
  --color-bg-tertiary-light: #f3f4f6;
  --color-text-primary-light: #1f2937;
  --color-text-secondary-light: #6b7280;
  --color-border-light: #e5e7eb;

  /* Sizing */
  --size-sidebar-width: 280px;
  --size-command-bar-height: 60px;
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Z-index */
  --z-dropdown: 100;
  --z-modal: 1000;
  --z-toast: 2000;
  --z-tooltip: 1500;
}

/* Dark Theme */
body.theme-dark {
  --bg-primary: var(--color-bg-primary-dark);
  --bg-secondary: var(--color-bg-secondary-dark);
  --bg-tertiary: var(--color-bg-tertiary-dark);
  --text-primary: var(--color-text-primary-dark);
  --text-secondary: var(--color-text-secondary-dark);
  --border-color: var(--color-border-dark);
}

/* Light Theme */
body.theme-light {
  --bg-primary: var(--color-bg-primary-light);
  --bg-secondary: var(--color-bg-secondary-light);
  --bg-tertiary: var(--color-bg-tertiary-light);
  --text-primary: var(--color-text-primary-light);
  --text-secondary: var(--color-text-secondary-light);
  --border-color: var(--color-border-light);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
    sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.95rem; }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary);
}

/* ============================================
   BUTTONS
   ============================================ */

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  transition: all var(--transition-fast);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

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

.btn-secondary:hover {
  background: var(--bg-secondary);
}

.btn-danger {
  background: var(--color-error);
  color: white;
}

.btn-danger:hover {
  opacity: 0.9;
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.85rem;
}

.btn-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: 1.05rem;
}

/* Icon Buttons */
.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: transparent;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.icon-btn.active {
  background: var(--color-primary);
  color: white;
}

/* ============================================
   FORMS
   ============================================ */

.form-input,
input,
textarea,
select {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form-input:focus,
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9rem;
}

/* ============================================
   UTILITIES
   ============================================ */

.flex-1 {
  flex: 1;
}

.gap {
  gap: var(--space-md);
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-lg {
  gap: var(--space-lg);
}

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.text-sm {
  font-size: 0.85rem;
}

.text-xs {
  font-size: 0.75rem;
}

.mb {
  margin-bottom: var(--space-md);
}

.mt {
  margin-top: var(--space-md);
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
  transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ============================================
   ICONS (Feather Icons)
   ============================================ */

[class*="icon-"] {
  width: 1.25rem;
  height: 1.25rem;
  display: inline-block;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInFromRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  :root {
    --size-sidebar-width: 250px;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.1rem; }
}

@media (max-width: 640px) {
  :root {
    --size-sidebar-width: 200px;
    --space-lg: 12px;
    --space-md: 10px;
  }

  h1 { font-size: 1.25rem; }
  h2 { font-size: 1.1rem; }
  h3 { font-size: 1rem; }

  .btn {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
  }
}