/* ==========================================================================
   Aviation Accounting System — Design System
   Core design tokens, reset, typography, and utility classes
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --primary: #0f2b4c;
  --primary-dark: #0a1f38;
  --primary-light: #1a3d6b;
  --secondary: #64748b;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --background: #f1f5f9;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  /* Spacing */
  --space-2xs: 0.125rem;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-base: 1rem;
  --space-lg: 1.25rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.06);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;

  /* Typography */
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 72px;

  /* Header */
  --header-height: 64px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Z-Index Layers */
  --z-sidebar: 100;
  --z-header: 200;
  --z-dropdown: 300;
  --z-modal: 400;
  --z-toast: 500;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

fieldset {
  border: none;
}

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

:focus:not(:focus-visible) {
  outline: none;
}

/* --------------------------------------------------------------------------
   Selection
   -------------------------------------------------------------------------- */
::selection {
  background-color: var(--primary);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   Scrollbar — Custom Styles
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background-color: var(--text-muted);
  border-radius: var(--radius-xl);
}

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

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--text-muted) transparent;
}

/* --------------------------------------------------------------------------
   Screen Reader Only
   -------------------------------------------------------------------------- */
.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;
}

/* --------------------------------------------------------------------------
   Typography — Sizes
   -------------------------------------------------------------------------- */
.text-xs {
  font-size: 0.75rem;
  line-height: 1rem;
}

.text-sm {
  font-size: 0.8125rem;
  line-height: 1.25rem;
}

.text-base {
  font-size: 0.875rem;
  line-height: 1.5rem;
}

.text-lg {
  font-size: 1rem;
  line-height: 1.5rem;
}

.text-xl {
  font-size: 1.125rem;
  line-height: 1.75rem;
}

.text-2xl {
  font-size: 1.25rem;
  line-height: 1.75rem;
}

.text-3xl {
  font-size: 1.5rem;
  line-height: 2rem;
}

.text-4xl {
  font-size: 2rem;
  line-height: 2.5rem;
}

.text-5xl {
  font-size: 3rem;
  line-height: 1;
}

/* --------------------------------------------------------------------------
   Typography — Weights
   -------------------------------------------------------------------------- */
.font-regular {
  font-weight: 400;
}

.font-medium {
  font-weight: 500;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   Typography — Colors
   -------------------------------------------------------------------------- */
.text-primary {
  color: var(--text-primary);
}

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

.text-muted {
  color: var(--text-muted);
}

.text-success {
  color: var(--success);
}

.text-warning {
  color: var(--warning);
}

.text-danger {
  color: var(--danger);
}

/* --------------------------------------------------------------------------
   Typography — Transforms
   -------------------------------------------------------------------------- */
.text-uppercase {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.text-lowercase {
  text-transform: lowercase;
}

.text-capitalize {
  text-transform: capitalize;
}

/* --------------------------------------------------------------------------
   Typography — Overflow & White Space
   -------------------------------------------------------------------------- */
.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.text-nowrap {
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Typography — Alignment
   -------------------------------------------------------------------------- */
.text-start {
  text-align: start;
}

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

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

/* --------------------------------------------------------------------------
   Financial Number Formatting
   -------------------------------------------------------------------------- */
.currency,
.amount-positive,
.amount-negative,
.amount-zero {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.amount-positive {
  color: var(--success);
}

.amount-negative {
  color: var(--danger);
}

.amount-zero {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Display
   -------------------------------------------------------------------------- */
.d-none {
  display: none;
}

.d-flex {
  display: flex;
}

.d-block {
  display: block;
}

.d-grid {
  display: grid;
}

.d-inline-flex {
  display: inline-flex;
}

/* --------------------------------------------------------------------------
   Flexbox
   -------------------------------------------------------------------------- */
.flex-column {
  flex-direction: column;
}

.flex-row {
  flex-direction: row;
}

.flex-wrap {
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Justify Content
   -------------------------------------------------------------------------- */
.justify-start {
  justify-content: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-end {
  justify-content: flex-end;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

/* --------------------------------------------------------------------------
   Align Items
   -------------------------------------------------------------------------- */
.align-start {
  align-items: flex-start;
}

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

.align-end {
  align-items: flex-end;
}

.align-stretch {
  align-items: stretch;
}

/* --------------------------------------------------------------------------
   Gap
   -------------------------------------------------------------------------- */
.gap-2xs {
  gap: var(--space-2xs);
}

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

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

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

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

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

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

/* --------------------------------------------------------------------------
   Margin
   -------------------------------------------------------------------------- */
.m-0 {
  margin: 0;
}

.m-xs {
  margin: var(--space-xs);
}

.m-sm {
  margin: var(--space-sm);
}

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

.m-base {
  margin: var(--space-base);
}

.m-lg {
  margin: var(--space-lg);
}

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

/* Margin Top */
.mt-0 {
  margin-top: 0;
}

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

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

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

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

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

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

/* Margin Bottom */
.mb-0 {
  margin-bottom: 0;
}

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

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

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

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

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

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

/* Margin Start (Left) */
.ms-0 {
  margin-inline-start: 0;
}

.ms-xs {
  margin-inline-start: var(--space-xs);
}

.ms-sm {
  margin-inline-start: var(--space-sm);
}

.ms-md {
  margin-inline-start: var(--space-md);
}

.ms-base {
  margin-inline-start: var(--space-base);
}

.ms-lg {
  margin-inline-start: var(--space-lg);
}

.ms-xl {
  margin-inline-start: var(--space-xl);
}

/* Margin End (Right) */
.me-0 {
  margin-inline-end: 0;
}

.me-xs {
  margin-inline-end: var(--space-xs);
}

.me-sm {
  margin-inline-end: var(--space-sm);
}

.me-md {
  margin-inline-end: var(--space-md);
}

.me-base {
  margin-inline-end: var(--space-base);
}

.me-lg {
  margin-inline-end: var(--space-lg);
}

.me-xl {
  margin-inline-end: var(--space-xl);
}

/* Margin Horizontal (Left + Right) */
.mx-0 {
  margin-left: 0;
  margin-right: 0;
}

.mx-xs {
  margin-left: var(--space-xs);
  margin-right: var(--space-xs);
}

.mx-sm {
  margin-left: var(--space-sm);
  margin-right: var(--space-sm);
}

.mx-md {
  margin-left: var(--space-md);
  margin-right: var(--space-md);
}

.mx-base {
  margin-left: var(--space-base);
  margin-right: var(--space-base);
}

.mx-lg {
  margin-left: var(--space-lg);
  margin-right: var(--space-lg);
}

.mx-xl {
  margin-left: var(--space-xl);
  margin-right: var(--space-xl);
}

/* Margin Vertical (Top + Bottom) */
.my-0 {
  margin-top: 0;
  margin-bottom: 0;
}

.my-xs {
  margin-top: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.my-sm {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
}

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

.my-base {
  margin-top: var(--space-base);
  margin-bottom: var(--space-base);
}

.my-lg {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
}

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

/* --------------------------------------------------------------------------
   Padding
   -------------------------------------------------------------------------- */
.p-0 {
  padding: 0;
}

.p-xs {
  padding: var(--space-xs);
}

.p-sm {
  padding: var(--space-sm);
}

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

.p-base {
  padding: var(--space-base);
}

.p-lg {
  padding: var(--space-lg);
}

.p-xl {
  padding: var(--space-xl);
}

/* Padding Top */
.pt-0 {
  padding-top: 0;
}

.pt-xs {
  padding-top: var(--space-xs);
}

.pt-sm {
  padding-top: var(--space-sm);
}

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

.pt-base {
  padding-top: var(--space-base);
}

.pt-lg {
  padding-top: var(--space-lg);
}

.pt-xl {
  padding-top: var(--space-xl);
}

/* Padding Bottom */
.pb-0 {
  padding-bottom: 0;
}

.pb-xs {
  padding-bottom: var(--space-xs);
}

.pb-sm {
  padding-bottom: var(--space-sm);
}

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

.pb-base {
  padding-bottom: var(--space-base);
}

.pb-lg {
  padding-bottom: var(--space-lg);
}

.pb-xl {
  padding-bottom: var(--space-xl);
}

/* Padding Start (Left) */
.ps-0 {
  padding-inline-start: 0;
}

.ps-xs {
  padding-inline-start: var(--space-xs);
}

.ps-sm {
  padding-inline-start: var(--space-sm);
}

.ps-md {
  padding-inline-start: var(--space-md);
}

.ps-base {
  padding-inline-start: var(--space-base);
}

.ps-lg {
  padding-inline-start: var(--space-lg);
}

.ps-xl {
  padding-inline-start: var(--space-xl);
}

/* Padding End (Right) */
.pe-0 {
  padding-inline-end: 0;
}

.pe-xs {
  padding-inline-end: var(--space-xs);
}

.pe-sm {
  padding-inline-end: var(--space-sm);
}

.pe-md {
  padding-inline-end: var(--space-md);
}

.pe-base {
  padding-inline-end: var(--space-base);
}

.pe-lg {
  padding-inline-end: var(--space-lg);
}

.pe-xl {
  padding-inline-end: var(--space-xl);
}

/* Padding Horizontal (Left + Right) */
.px-0 {
  padding-left: 0;
  padding-right: 0;
}

.px-xs {
  padding-left: var(--space-xs);
  padding-right: var(--space-xs);
}

.px-sm {
  padding-left: var(--space-sm);
  padding-right: var(--space-sm);
}

.px-md {
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.px-base {
  padding-left: var(--space-base);
  padding-right: var(--space-base);
}

.px-lg {
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.px-xl {
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
}

/* Padding Vertical (Top + Bottom) */
.py-0 {
  padding-top: 0;
  padding-bottom: 0;
}

.py-xs {
  padding-top: var(--space-xs);
  padding-bottom: var(--space-xs);
}

.py-sm {
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
}

.py-md {
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.py-base {
  padding-top: var(--space-base);
  padding-bottom: var(--space-base);
}

.py-lg {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.py-xl {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

/* --------------------------------------------------------------------------
   Width & Height
   -------------------------------------------------------------------------- */
.w-100 {
  width: 100%;
}

.h-100 {
  height: 100%;
}

.w-auto {
  width: auto;
}

.h-auto {
  height: auto;
}

/* --------------------------------------------------------------------------
   Overflow
   -------------------------------------------------------------------------- */
.overflow-hidden {
  overflow: hidden;
}

.overflow-auto {
  overflow: auto;
}

.overflow-scroll {
  overflow: scroll;
}

/* --------------------------------------------------------------------------
   Position
   -------------------------------------------------------------------------- */
.position-relative {
  position: relative;
}

.position-absolute {
  position: absolute;
}

.position-fixed {
  position: fixed;
}

.position-sticky {
  position: sticky;
}

/* --------------------------------------------------------------------------
   Border Radius
   -------------------------------------------------------------------------- */
.rounded {
  border-radius: var(--radius-md);
}

.rounded-sm {
  border-radius: var(--radius-sm);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-xl {
  border-radius: var(--radius-xl);
}

.rounded-full {
  border-radius: 9999px;
}

/* --------------------------------------------------------------------------
   Border
   -------------------------------------------------------------------------- */
.border {
  border: 1px solid var(--border);
}

.border-0 {
  border: 0;
}

/* --------------------------------------------------------------------------
   Shadow
   -------------------------------------------------------------------------- */
.shadow-sm {
  box-shadow: var(--shadow-sm);
}

.shadow {
  box-shadow: var(--shadow-md);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   Cursor & Selection
   -------------------------------------------------------------------------- */
.cursor-pointer {
  cursor: pointer;
}

.user-select-none {
  user-select: none;
  -webkit-user-select: none;
}

/* --------------------------------------------------------------------------
   Opacity
   -------------------------------------------------------------------------- */
.opacity-0 {
  opacity: 0;
}

.opacity-25 {
  opacity: 0.25;
}

.opacity-50 {
  opacity: 0.5;
}

.opacity-75 {
  opacity: 0.75;
}

.opacity-100 {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   Transitions (Reusable)
   -------------------------------------------------------------------------- */
.transition-fast {
  transition: all var(--transition-fast);
}

.transition-normal {
  transition: all var(--transition-normal);
}

.transition-slow {
  transition: all var(--transition-slow);
}

/* --------------------------------------------------------------------------
   Background
   -------------------------------------------------------------------------- */
.bg-primary {
  background-color: var(--primary);
}

.bg-primary-dark {
  background-color: var(--primary-dark);
}

.bg-primary-light {
  background-color: var(--primary-light);
}

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

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

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

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

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