@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* RK Knit Fab - Design System Tokens */
:root {
  /* Colors */
  --bg-canvas: #F9FAFB;
  --surface-primary: #FFFFFF;
  --surface-glass: rgba(255, 255, 255, 0.7);
  --brand-primary: #0F172A;
  --accent: #10B981;
  --accent-hover: #059669;
  --accent-light: #D1FAE5;
  --success: #22C55E;
  --success-light: #DCFCE7;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  
  /* Text */
  --text-high: #0F172A;
  --text-med: #475569;
  --text-low: #94A3B8;
  
  /* Borders */
  --border-default: #E2E8F0;
  --border-interactive: #CBD5E1;
  
  /* Shadows */
  --shadow-flat: 0px 0px 0px transparent;
  --shadow-low: 0px 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-medium: 0px 4px 6px -1px rgba(0, 0, 0, 0.05), 0px 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-high: 0px 12px 36px -8px rgba(15, 23, 42, 0.12);
  
  /* Spacing Grid (8px Base) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  
  /* Geometry */
  --radius-container: 16px;
  --radius-component: 8px;
  --radius-button: 6px;
  --radius-avatar: 50%;
  
  /* Navigation Sizing */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 64px;
  --header-height: 72px;
}

/* Base Resets & Layout */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-high);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  height: 100vh;
}

/* Glassmorphism Surface standard */
.glass-panel {
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-container);
  box-shadow: var(--shadow-low);
}

.glass-panel-interactive {
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-container);
  box-shadow: var(--shadow-low);
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1), box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-panel-interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-high);
  border-color: var(--border-interactive);
}

/* Layout structure */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  position: relative;
  overflow: hidden;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  transition: padding-left 300ms cubic-bezier(0.4, 0, 0.2, 1);
  padding: var(--space-3);
  padding-top: calc(var(--header-height) + var(--space-3));
}

/* Header standard */
.app-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  height: var(--header-height);
  background: rgba(249, 250, 251, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-3);
  z-index: 40;
  transition: left 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Standard scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-interactive);
  border-radius: 3px;
}

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

/* Typography styles */
h1, .h1 {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--brand-primary);
  line-height: 1.2;
}

h2, .h2 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--brand-primary);
  line-height: 1.3;
}

h3, .h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--brand-primary);
  line-height: 1.4;
}

p, .body-large {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-med);
}

.body-small {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-med);
}

.caption {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-low);
}

/* Buttons System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-button);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #FFFFFF;
  border-color: var(--brand-primary);
}

.btn-primary:hover {
  background-color: #1E293B;
  border-color: #1E293B;
  box-shadow: var(--shadow-low);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-med);
  border-color: var(--border-interactive);
}

.btn-secondary:hover {
  background-color: #F1F5F9;
  color: var(--text-high);
  border-color: var(--text-med);
}

.btn-accent {
  background-color: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
}

.btn-accent:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: var(--shadow-low);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-med);
}

.btn-ghost:hover {
  background-color: #F1F5F9;
  color: var(--text-high);
}

.btn-danger {
  background-color: var(--danger);
  color: #FFFFFF;
  border-color: var(--danger);
}

.btn-danger:hover {
  background-color: #DC2626;
  border-color: #DC2626;
}

/* Badge components */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
}

.badge-priority-high {
  background-color: var(--accent-light);
  color: var(--accent-hover);
}

.badge-priority-medium {
  background-color: var(--warning-light);
  color: #B45309;
}

.badge-priority-low {
  background-color: #F1F5F9;
  color: #475569;
}

.badge-status-active {
  background-color: #E2E8F0;
  color: var(--brand-primary);
}

.badge-status-inactive {
  background-color: #F1F5F9;
  color: var(--text-low);
}

.badge-status-blocked {
  background-color: var(--danger-light);
  color: var(--danger);
}

/* Inputs & Form Elements */
.form-group {
  margin-bottom: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-med);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text-high);
  background-color: #FFFFFF;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-component);
  outline: none;
  transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.15);
}

.form-input::placeholder {
  color: var(--text-low);
}

.form-input.is-invalid {
  border-color: var(--danger);
}

.form-input.is-invalid:focus {
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.15);
}

.invalid-feedback {
  font-size: 12px;
  color: var(--danger);
  margin-top: 2px;
  display: none;
}

.form-input.is-invalid + .invalid-feedback {
  display: block;
}

/* Screen layout states (Sidebar active state padding) */
.app-container.sidebar-open .main-content {
  padding-left: calc(var(--sidebar-width) + var(--space-3));
}

.app-container.sidebar-collapsed .main-content {
  padding-left: calc(var(--sidebar-collapsed-width) + var(--space-3));
}

.app-container.sidebar-open .app-header {
  left: var(--sidebar-width);
}

.app-container.sidebar-collapsed .app-header {
  left: var(--sidebar-collapsed-width);
}

/* Grid helper */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

/* Avatar system */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-avatar);
  background-color: var(--brand-primary);
  color: #FFFFFF;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  user-select: none;
  border: 2px solid #FFFFFF;
  box-shadow: var(--shadow-low);
}

.avatar-lg {
  width: 64px;
  height: 64px;
  font-size: 20px;
}

/* Media queries for desktop margins and structures */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 64px; /* Force tablet mode sidebar default */
  }
  .app-container.sidebar-open .main-content,
  .app-container.sidebar-collapsed .main-content {
    padding-left: calc(var(--sidebar-collapsed-width) + var(--space-2));
  }
  .app-container.sidebar-open .app-header,
  .app-container.sidebar-collapsed .app-header {
    left: var(--sidebar-collapsed-width);
  }
  
  /* At 64px the sidebar has no room for label text - hide it so the
     column shows icons only instead of clipping overflowing text. */
  .app-sidebar .nav-label,
  .app-sidebar .brand-text,
  .app-sidebar .profile-details {
    display: none;
  }
  .app-sidebar .nav-btn {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
  }
  .app-sidebar .sidebar-brand {
    justify-content: center;
    padding: 0;
  }
  .app-sidebar .sidebar-profile {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }
  .app-container {
    flex-direction: column;
  }
  .main-content {
    padding: var(--space-2);
    padding-top: calc(var(--header-height) + var(--space-2));
    padding-bottom: 80px; /* Tab bar gap */
    width: 100% !important;
  }
  .app-container.sidebar-open .main-content,
  .app-container.sidebar-collapsed .main-content {
    padding-left: var(--space-2);
  }
  .app-container.sidebar-open .app-header,
  .app-container.sidebar-collapsed .app-header {
    left: 0;
  }
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}