/**
 * ================================================================================
 * AMBICA WOODEN WORKS - SMART CFT CALCULATOR
 * STYLE ENGINE (CSS)
 * ================================================================================
 * 
 * PURPOSE:
 * Contains all CSS utility classes and styles for the calculator application.
 * These are Tailwind CSS-like utilities for consistent styling without a build step.
 * 
 * FILE LOCATION: styles/main.css
 * 
 * DEPENDENCIES:
 * - System fonts: Georgia/serif for headings, system-ui/sans-serif for body text
 * 
 * USED BY:
 * - index.html (main entry point)
 * - All React components in js/components.js
 * - js/app.js (main application)
 * 
 * SECTIONS:
 * 1. Reset & Base Styles
 * 2. Font Families, Weights, and Sizes
 * 3. Text Colors
 * 4. Background Colors
 * 5. Border Colors, Widths, and Styles
 * 6. Border Radius
 * 7. Padding & Margin
 * 8. Width, Height, and Max Width
 * 9. Display & Flexbox
 * 10. Grid System
 * 11. Gap & Spacing
 * 12. Position & Z-Index
 * 13. Text Alignment & Transform
 * 14. Shadows
 * 15. Overflow & Outline
 * 16. Transitions & Animations
 * 17. Custom Patterns (Wood Pattern)
 * 18. Hover, Focus, and Active States
 * 19. Responsive Design (Media Queries)
 * 
 * ================================================================================
 */

/* ============================================================
   SECTION 1: RESET & BASE STYLES
   ============================================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    overscroll-behavior-y: none;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
    background-color: #fef3c7;
    color: #0f172a;
    padding-bottom: 10rem;
    user-select: none;
    -webkit-user-select: none;
}

/* High Contrast Inputs - Remove default spinners */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

select::-ms-expand {
    display: none;
}

/* ============================================================
   SECTION 2: FONT FAMILIES, WEIGHTS, AND SIZES
   ============================================================ */

/* Font Families */
.font-brand {
    font-family: Georgia, 'Times New Roman', Times, serif;
}

.font-sans {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.font-mono {
    font-family: ui-monospace, monospace;
}

/* Font Weights */
.font-bold {
    font-weight: 700;
}

.font-black {
    font-weight: 900;
}

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

.text-sm {
    font-size: 0.875rem;
    line-height: 1.25rem;
}

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

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

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

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

.text-3xl {
    font-size: 1.875rem;
    line-height: 2.25rem;
}

.text-4xl {
    font-size: 2.25rem;
    line-height: 2.5rem;
}

.text-6xl {
    font-size: 3.75rem;
    line-height: 1;
}

.text-\[9px\] {
    font-size: 9px;
}

.text-\[10px\] {
    font-size: 10px;
}

.text-\[11px\] {
    font-size: 11px;
}

/* ============================================================
   SECTION 3: TEXT COLORS
   ============================================================ */
.text-white {
    color: #ffffff;
}

.text-black {
    color: #000000;
}

.text-slate-300 {
    color: #cbd5e1;
}

.text-slate-400 {
    color: #94a3b8;
}

.text-slate-500 {
    color: #64748b;
}

.text-slate-600 {
    color: #475569;
}

.text-slate-900 {
    color: #0f172a;
}

.text-amber-400 {
    color: #fbbf24;
}

.text-amber-500 {
    color: #f59e0b;
}

.text-amber-600 {
    color: #d97706;
}

.text-amber-800 {
    color: #92400e;
}

.text-amber-900 {
    color: #78350f;
}

.text-blue-600 {
    color: #2563eb;
}

.text-blue-800 {
    color: #1e40af;
}

.text-red-600 {
    color: #dc2626;
}

/* ============================================================
   SECTION 4: BACKGROUND COLORS
   ============================================================ */
.bg-white {
    background-color: #ffffff;
}

.bg-black {
    background-color: #000000;
}

.bg-slate-100 {
    background-color: #f1f5f9;
}

.bg-slate-200 {
    background-color: #e2e8f0;
}

.bg-slate-600 {
    background-color: #475569;
}

.bg-slate-800 {
    background-color: #1e293b;
}

.bg-slate-900 {
    background-color: #0f172a;
}

.bg-amber-50 {
    background-color: #fffbeb;
}

.bg-amber-100 {
    background-color: #fef3c7;
}

.bg-amber-200 {
    background-color: #fde68a;
}

.bg-amber-500 {
    background-color: #f59e0b;
}

.bg-amber-600 {
    background-color: #d97706;
}

.bg-blue-50 {
    background-color: #eff6ff;
}

.bg-blue-600 {
    background-color: #2563eb;
}

.bg-red-600 {
    background-color: #dc2626;
}

.bg-white\/90 {
    background-color: rgba(255, 255, 255, 0.9);
}

/* ============================================================
   SECTION 5: BORDER COLORS
   ============================================================ */
.border-black {
    border-color: #000000;
}

.border-white {
    border-color: #ffffff;
}

.border-slate-100 {
    border-color: #f1f5f9;
}

.border-slate-200 {
    border-color: #e2e8f0;
}

.border-slate-300 {
    border-color: #cbd5e1;
}

.border-slate-400 {
    border-color: #94a3b8;
}

.border-slate-700 {
    border-color: #334155;
}

.border-slate-900 {
    border-color: #0f172a;
}

.border-amber-200 {
    border-color: #fde68a;
}

.border-amber-300 {
    border-color: #fcd34d;
}

.border-amber-500 {
    border-color: #f59e0b;
}

.border-amber-600 {
    border-color: #d97706;
}

.border-amber-800 {
    border-color: #92400e;
}

.border-amber-900 {
    border-color: #78350f;
}

.border-blue-200 {
    border-color: #bfdbfe;
}

.border-blue-300 {
    border-color: #93c5fd;
}

.border-blue-600 {
    border-color: #2563eb;
}

.border-red-800 {
    border-color: #991b1b;
}

/* Border Widths */
.border {
    border-width: 1px;
}

.border-2 {
    border-width: 2px;
}

.border-4 {
    border-width: 4px;
}

.border-b {
    border-bottom-width: 1px;
}

.border-b-2 {
    border-bottom-width: 2px;
}

.border-b-4 {
    border-bottom-width: 4px;
}

.border-t-2 {
    border-top-width: 2px;
}

.border-t-4 {
    border-top-width: 4px;
}

/* Border Styles */
.border-dashed {
    border-style: dashed;
}

/* ============================================================
   SECTION 6: BORDER RADIUS
   ============================================================ */
.rounded {
    border-radius: 0.25rem;
}

.rounded-lg {
    border-radius: 0.5rem;
}

.rounded-xl {
    border-radius: 0.75rem;
}

.rounded-2xl {
    border-radius: 1rem;
}

.rounded-b-lg {
    border-bottom-left-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
}

.rounded-br-lg {
    border-bottom-right-radius: 0.5rem;
}

/* ============================================================
   SECTION 7: PADDING & MARGIN
   ============================================================ */

/* Padding */
.p-1 {
    padding: 0.25rem;
}

.p-2 {
    padding: 0.5rem;
}

.p-3 {
    padding: 0.75rem;
}

.p-4 {
    padding: 1rem;
}

.p-5 {
    padding: 1.25rem;
}

.p-6 {
    padding: 1.5rem;
}

.px-0 {
    padding-left: 0;
    padding-right: 0;
}

.px-1 {
    padding-left: 0.25rem;
    padding-right: 0.25rem;
}

.px-2 {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.px-3 {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
}

.px-4 {
    padding-left: 1rem;
    padding-right: 1rem;
}

.py-1 {
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
}

.py-2 {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

.py-3 {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}

.py-4 {
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.py-5 {
    padding-top: 1.25rem;
    padding-bottom: 1.25rem;
}

.pt-4 {
    padding-top: 1rem;
}

.pb-2 {
    padding-bottom: 0.5rem;
}

.pb-4 {
    padding-bottom: 1rem;
}

.pb-10 {
    padding-bottom: 2.5rem;
}

.pb-40 {
    padding-bottom: 10rem;
}

.pl-1 {
    padding-left: 0.25rem;
}

/* Margin */
.mt-1 {
    margin-top: 0.25rem;
}

.mt-4 {
    margin-top: 1rem;
}

.mb-1 {
    margin-bottom: 0.25rem;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-3 {
    margin-bottom: 0.75rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mb-6 {
    margin-bottom: 1.5rem;
}

.ml-1 {
    margin-left: 0.25rem;
}

.mr-1 {
    margin-right: 0.25rem;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

.mx-2 {
    margin-left: 0.5rem;
    margin-right: 0.5rem;
}

.-mx-4 {
    margin-left: -1rem;
    margin-right: -1rem;
}

.-bottom-4 {
    bottom: -1rem;
}

/* ============================================================
   SECTION 8: WIDTH, HEIGHT, AND MAX WIDTH
   ============================================================ */
.w-full {
    width: 100%;
}

.w-10 {
    width: 2.5rem;
}

.w-12 {
    width: 3rem;
}

.w-24 {
    width: 6rem;
}

.w-32 {
    width: 8rem;
}

.w-0\.5 {
    width: 0.125rem;
}

.h-10 {
    height: 2.5rem;
}

.h-12 {
    height: 3rem;
}

.min-h-screen {
    min-height: 100vh;
}

/* Max Width */
.max-w-2xl {
    max-width: 42rem;
}

/* ============================================================
   SECTION 9: DISPLAY & FLEXBOX
   ============================================================ */
.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

.flex {
    display: flex;
}

.grid {
    display: grid;
}

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

.flex-grow {
    flex-grow: 1;
}

.flex-1 {
    flex: 1 1 0%;
}

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

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

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

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

/* ============================================================
   SECTION 10: GRID SYSTEM
   ============================================================ */
.grid-cols-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-5 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.grid-cols-12 {
    grid-template-columns: repeat(12, minmax(0, 1fr));
}

.col-span-1 {
    grid-column: span 1 / span 1;
}

.col-span-2 {
    grid-column: span 2 / span 2;
}

.col-span-3 {
    grid-column: span 3 / span 3;
}

/* ============================================================
   SECTION 11: GAP & SPACING
   ============================================================ */
.gap-2 {
    gap: 0.5rem;
}

.gap-3 {
    gap: 0.75rem;
}

.gap-4 {
    gap: 1rem;
}

.space-y-3>*+* {
    margin-top: 0.75rem;
}

.space-y-4>*+* {
    margin-top: 1rem;
}

.space-y-6>*+* {
    margin-top: 1.5rem;
}

/* ============================================================
   SECTION 12: POSITION & Z-INDEX
   ============================================================ */
.relative {
    position: relative;
}

.absolute {
    position: absolute;
}

.fixed {
    position: fixed;
    will-change: transform;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.top-0 {
    top: 0;
}

.left-0 {
    left: 0;
}

.right-2 {
    right: 0.5rem;
}

.bottom-2 {
    bottom: 0.5rem;
}

/* Z-Index */
.z-10 {
    z-index: 10;
}

.z-50 {
    z-index: 50;
}

.z-\[100\] {
    z-index: 100;
}

/* ============================================================
   SECTION 13: TEXT ALIGNMENT & TRANSFORM
   ============================================================ */
.text-left {
    text-align: left;
}

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

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

/* Text Transform */
.uppercase {
    text-transform: uppercase;
}

/* Letter Spacing */
.tracking-tight {
    letter-spacing: -0.025em;
}

.tracking-wide {
    letter-spacing: 0.025em;
}

.tracking-wider {
    letter-spacing: 0.05em;
}

.tracking-widest {
    letter-spacing: 0.1em;
}

.tracking-\[0\.2em\] {
    letter-spacing: 0.2em;
}

/* Line Height */
.leading-none {
    line-height: 1;
}

.leading-tight {
    line-height: 1.25;
}

/* ============================================================
   SECTION 14: SHADOWS
   ============================================================ */
.shadow-sm {
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}

.shadow-md {
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

.shadow-xl {
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

.shadow-inner {
    box-shadow: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
}

.shadow-\[4px_4px_0px_0px_rgba\(0\,0\,0\,0\.2\)\] {
    box-shadow: 4px 4px 0px 0px rgba(0, 0, 0, 0.2);
}

.shadow-\[4px_4px_0px_0px_rgba\(0\,0\,0\,0\.4\)\] {
    box-shadow: 4px 4px 0px 0px rgba(0, 0, 0, 0.4);
}

.shadow-\[8px_8px_0px_0px_rgba\(0\,0\,0\,0\.3\)\] {
    box-shadow: 8px 8px 0px 0px rgba(0, 0, 0, 0.3);
}

/* ============================================================
   SECTION 15: OVERFLOW & OUTLINE
   ============================================================ */
.overflow-hidden {
    overflow: hidden;
}

/* Outline */
.outline-none {
    outline: 2px solid transparent;
    outline-offset: 2px;
}

/* Appearance */
.appearance-none {
    appearance: none;
}

/* Pointer Events */
.pointer-events-none {
    pointer-events: none;
}

/* User Select */
.select-none {
    user-select: none;
    -webkit-user-select: none;
}

/* Vertical Align */
.align-top {
    vertical-align: top;
}

/* ============================================================
   SECTION 16: TRANSITIONS & ANIMATIONS
   ============================================================ */
.transition-all {
    transition-property: all;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 150ms;
}

.transition-colors {
    transition-property: color, background-color, border-color, text-decoration-color, fill, stroke;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 150ms;
}

/* Transition Duration */
.duration-300 {
    transition-duration: 300ms;
}

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

.opacity-80 {
    opacity: 0.8;
}

.opacity-100 {
    opacity: 1;
}

/* Transform utilities */
.translate-y-0 {
    transform: translateY(0);
}

.-translate-y-full {
    transform: translateY(-100%);
}

/* Transform */
.scale-105 {
    transform: scale(1.05);
}

/* Animations */
@keyframes fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.animate-fade-in {
    animation: fade-in 0.3s ease-in-out;
}

/* ============================================================
   SECTION 17: CUSTOM PATTERNS (WOOD PATTERN)
   ============================================================ */
.wood-pattern {
    background-color: #fcecdb;
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h40v40H0V0zm20 20h20v20H20V20zM0 20h20v20H0V20z' fill='%23d97706' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
}

/* Sticky Bar Animations */
.sticky-bar-enter {
    transform: translateY(-100%);
    opacity: 0;
}

.sticky-bar-active {
    transform: translateY(0);
    opacity: 1;
    transition: all 0.3s ease-in-out;
}

.sticky-bar-exit {
    transform: translateY(-100%);
    opacity: 0;
    transition: all 0.3s ease-in-out;
}

/* ============================================================
   SECTION 18: HOVER, FOCUS, AND ACTIVE STATES
   ============================================================ */
.hover\:bg-slate-100:hover {
    background-color: #f1f5f9;
}

.hover\:bg-slate-300:hover {
    background-color: #e2e8f0;
}

.hover\:bg-blue-50:hover {
    background-color: #eff6ff;
}

.hover\:bg-amber-600:hover {
    background-color: #d97706;
}

.hover\:bg-red-700:hover {
    background-color: #b91c1c;
}

.hover\:border-black:hover {
    border-color: #000000;
}

.hover\:text-slate-700:hover {
    color: #334155;
}

.active\:bg-slate-400:active {
    background-color: #94a3b8;
}

.focus\:ring-4:focus {
    outline: none;
}

.focus\:ring-amber-200:focus {
    box-shadow: 0 0 0 4px #fde68a;
}

.focus\:ring-amber-400:focus {
    box-shadow: 0 0 0 4px #fbbf24;
}

.focus\:ring-amber-500\/50:focus {
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.5);
}

.focus\:border-amber-600:focus {
    border-color: #d97706;
}

.focus\:border-amber-700:focus {
    border-color: #b45309;
}

/* ============================================================
   SECTION 19: RESPONSIVE DESIGN (MEDIA QUERIES)
   ============================================================ */
@media (min-width: 768px) {
    .md\:text-3xl {
        font-size: 1.875rem;
        line-height: 2.25rem;
    }

    .md\:grid-cols-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* ============================================================
   SECTION 20: LAST CHILD UTILITIES
   ============================================================ */
.last\:border-0:last-child {
    border-width: 0;
}