/* ============================================
   ITWMS Design System v2.0
   Enhanced layout, design & responsiveness
   ============================================ */

/* ===== CSS Custom Properties (Design Tokens) ===== */
:root {
  color-scheme: dark;

  /* Typography */
  --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;

  /* Base Colors - Dark Theme */
  --bg-deep: #050a14;
  --bg-base: #08111f;
  --bg-elevated: #0d1a2d;
  --bg-surface: rgba(12, 20, 36, 0.96);
  --bg-surface-hover: rgba(16, 28, 48, 0.98);
  --bg-overlay: rgba(5, 10, 20, 0.85);

  /* Surface with glass effect */
  --surface: rgba(12, 20, 36, 0.94);
  --surface-alt: rgba(18, 28, 48, 0.98);
  --surface-glass: rgba(12, 20, 36, 0.72);

  /* Border Colors */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.16);
  --border-focus: rgba(92, 127, 255, 0.50);

  /* Text Colors */
  --text: #f0f4ff;
  --text-secondary: #b8c5e0;
  --text-muted: #7a8db0;
  --text-disabled: #4a5a78;

  /* Accent Colors */
  --accent: #5c7fff;
  --accent-soft: rgba(92, 127, 255, 0.15);
  --accent-strong: #3e58f7;
  --accent-glow: rgba(92, 127, 255, 0.35);

  /* Semantic Colors */
  --success: #34d399;
  --success-soft: rgba(52, 211, 153, 0.12);
  --warning: #fbbf24;
  --warning-soft: rgba(251, 191, 36, 0.12);
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.12);
  --info: #60a5fa;
  --info-soft: rgba(96, 165, 250, 0.12);

  /* Spacing Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px var(--accent-glow);
  --shadow-inset: inset 0 1px 2px rgba(255, 255, 255, 0.05);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-drawer: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-toast: 600;

  /* Legacy compatibility */
  --radius: var(--radius-2xl);
}

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

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

body {
  font-family: var(--font-sans);
  background: 
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(92, 127, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(62, 88, 247, 0.06), transparent),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-base) 50%, var(--bg-elevated) 100%);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* Focus Visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.5rem); }
h4 { font-size: clamp(1rem, 2vw, 1.25rem); }

p {
  color: var(--text-secondary);
}

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

/* ===== Layout Utilities ===== */
.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--space-6); }
}
@media (min-width: 1024px) {
  .container { padding: 0 var(--space-8); }
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

.grid { display: grid; }

/* ===== Component: Card ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: 
    transform var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.card-elevated {
  background: var(--surface-alt);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.card-glass {
  background: var(--surface-glass);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-color: var(--border-subtle);
}

/* ===== Component: Button ===== */
button, .btn {
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9375rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  transition: 
    all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

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

button::after, .btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
button:hover::after, .btn:hover::after {
  opacity: 1;
}

.primary-button, .btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: white;
  box-shadow: 0 4px 14px rgba(92, 127, 255, 0.35), var(--shadow-inset);
}
.primary-button:hover, .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(92, 127, 255, 0.45), var(--shadow-inset);
}
.primary-button:active, .btn-primary:active {
  transform: translateY(0);
}

.secondary-button, .btn-secondary {
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.secondary-button:hover, .btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.ghost-button, .btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}
.ghost-button:hover, .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.danger-button, .btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
}
.danger-button:hover, .btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

/* Button sizes */
.btn-sm { padding: var(--space-2) var(--space-3); font-size: 0.8125rem; }
.btn-lg { padding: var(--space-4) var(--space-6); font-size: 1rem; }
.btn-icon { padding: var(--space-3); aspect-ratio: 1; }

/* ===== Component: Input ===== */
input, select, textarea {
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  width: 100%;
  transition: 
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

input:hover, select:hover, textarea:hover {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.06);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow-inset);
  background: rgba(255, 255, 255, 0.08);
}

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

select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%237a8db0' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 0 1 .708 0L8 8.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

select option {
  background: var(--bg-elevated);
  color: var(--text);
}

/* ===== Component: Status Pills ===== */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.status-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.status-pending { background: var(--warning-soft); color: var(--warning); }
.status-ongoing { background: var(--info-soft); color: var(--info); }
.status-in-progress { background: var(--info-soft); color: var(--info); }
.status-completed { background: var(--success-soft); color: var(--success); }
.status-cancelled { background: var(--danger-soft); color: var(--danger); }
.status-archived { background: rgba(255,255,255,0.06); color: var(--text-muted); }
.status-to_do { background: rgba(255,255,255,0.06); color: var(--text-muted); }
.status-rejected { background: var(--danger-soft); color: var(--danger); }
.status-pending_approval { background: rgba(251, 146, 60, 0.15); color: #fb923c; }

/* ===== Component: Table ===== */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table thead th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.6875rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  background: var(--surface-alt);
  position: sticky;
  top: 0;
  z-index: 1;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}
.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}
.data-table tbody td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: middle;
}
.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ===== Component: Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: 
    opacity var(--transition-base),
    visibility var(--transition-base);
}

.modal:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.96) translateY(10px);
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-xl);
}

.modal:not(.hidden) .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 1.125rem;
  margin: 0;
}

.modal-body {
  padding: var(--space-5) var(--space-6);
}

.modal-footer {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border);
}

/* ===== Component: Notification ===== */
.notification-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 400px;
  pointer-events: none;
}

.notification {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-base);
  pointer-events: auto;
  font-size: 0.875rem;
}

.notification--visible {
  opacity: 1;
  transform: translateX(0);
}

.notification--success { border-color: var(--success); background: rgba(52, 211, 153, 0.08); }
.notification--error { border-color: var(--danger); background: rgba(248, 113, 113, 0.08); }
.notification--warning { border-color: var(--warning); background: rgba(251, 191, 36, 0.08); }
.notification--info { border-color: var(--info); background: rgba(96, 165, 250, 0.08); }

.notification__icon {
  font-size: 1.125rem;
  flex-shrink: 0;
}
.notification__icon--success { color: var(--success); }
.notification__icon--error { color: var(--danger); }
.notification__icon--warning { color: var(--warning); }
.notification__icon--info { color: var(--info); }

.notification__message {
  flex: 1;
  color: var(--text);
}

.notification__close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.notification__close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

/* ===== Utility Classes ===== */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

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

/* Animation utilities */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.animate-fade-in { animation: fadeIn var(--transition-base) forwards; }
.animate-fade-in-up { animation: fadeInUp var(--transition-slow) forwards; }
.animate-slide-in { animation: slideInRight var(--transition-slow) forwards; }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Stagger children animation */
.stagger-children > * {
  opacity: 0;
  animation: fadeInUp var(--transition-slow) forwards;
}
.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }

/* ===== Skeleton Loading ===== */
.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04) 25%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.04) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

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

/* ===== Responsive Breakpoints ===== */
/* Mobile First Approach */

/* Small devices (phones, 640px and up) */
@media (min-width: 640px) {
  .sm\:flex { display: flex; }
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .sm\:hidden { display: none; }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  .md\:flex { display: flex; }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:hidden { display: none; }
}

/* Large devices (desktops, 1024px and up) */
@media (min-width: 1024px) {
  .lg\:flex { display: flex; }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
  .lg\:hidden { display: none; }
  .lg\:ml-64 { margin-left: 256px; }
}

/* Extra large devices (1200px and up) */
@media (min-width: 1280px) {
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ===== Print Styles ===== */
@media print {
  .sidebar, .menu-toggle, .notification-container {
    display: none !important;
  }
  .main-content {
    margin-left: 0 !important;
    max-width: 100% !important;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== High Contrast Mode ===== */
@media (prefers-contrast: high) {
  :root {
    --border: rgba(255, 255, 255, 0.3);
    --border-strong: rgba(255, 255, 255, 0.5);
    --text-muted: #a0b0d0;
  }
}