/* ============================================
   COMPREHENSIVE CSS FRAMEWORK
   Version: 1.0
   Description: A complete CSS framework with reusable components
   ============================================ */

/* ============================================
   1. CSS RESET AND BASE STYLES
   ============================================ */

/* Modern CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    /* Smooth scrolling */
    scroll-behavior: smooth;
    /* Prevent font size adjustment on mobile */
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

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

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

p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
}

a {
    text-decoration-skip-ink: auto;
}

/* Remove list styles */
ul[role='list'], ol[role='list'] {
    list-style: none;
}

/* ============================================
   2. CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================ */

:root {
    /* Color Palette */
    --color-primary-50: #e3f2fd;
    --color-primary-100: #bbdefb;
    --color-primary-200: #90caf9;
    --color-primary-300: #64b5f6;
    --color-primary-400: #42a5f5;
    --color-primary-500: #2196f3;
    --color-primary-600: #1e88e5;
    --color-primary-700: #1976d2;
    --color-primary-800: #1565c0;
    --color-primary-900: #0d47a1;

    --color-secondary-50: #f3e5f5;
    --color-secondary-100: #e1bee7;
    --color-secondary-200: #ce93d8;
    --color-secondary-300: #ba68c8;
    --color-secondary-400: #ab47bc;
    --color-secondary-500: #9c27b0;
    --color-secondary-600: #8e24aa;
    --color-secondary-700: #7b1fa2;
    --color-secondary-800: #6a1b9a;
    --color-secondary-900: #4a148c;

    --color-accent: #ff6b6b;
    --color-accent-light: #ff8787;
    --color-accent-dark: #ee5a5a;

    /* Neutral Colors */
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #eeeeee;
    --color-gray-300: #e0e0e0;
    --color-gray-400: #bdbdbd;
    --color-gray-500: #9e9e9e;
    --color-gray-600: #757575;
    --color-gray-700: #616161;
    --color-gray-800: #424242;
    --color-gray-900: #212121;

    /* Semantic Colors */
    --color-success: #4caf50;
    --color-warning: #ff9800;
    --color-error: #f44336;
    --color-info: #2196f3;

    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-dark: #212529;

    /* Text Colors */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-light: #f8f9fa;
    --text-muted: #868e96;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-secondary: Georgia, 'Times New Roman', serif;
    --font-mono: 'Courier New', Courier, monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;    /* 12px */
    --text-sm: 0.875rem;   /* 14px */
    --text-base: 1rem;     /* 16px */
    --text-lg: 1.125rem;   /* 18px */
    --text-xl: 1.25rem;    /* 20px */
    --text-2xl: 1.5rem;    /* 24px */
    --text-3xl: 1.875rem;  /* 30px */
    --text-4xl: 2.25rem;   /* 36px */
    --text-5xl: 3rem;      /* 48px */
    --text-6xl: 4rem;      /* 64px */

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Spacing Scale */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;
    --radius-base: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Z-index Scale */
    --z-negative: -1;
    --z-0: 0;
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-modal: 1000;
    --z-popover: 1100;
    --z-tooltip: 1200;
}

/* Dark mode variables */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #121212;
        --bg-secondary: #1e1e1e;
        --bg-tertiary: #2d2d2d;
        --text-primary: #f8f9fa;
        --text-secondary: #adb5bd;
    }
}

/* ============================================
   3. LAYOUT SYSTEM CLASSES
   ============================================ */

/* Containers */
.container {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
    padding-right: var(--space-4);
    padding-left: var(--space-4);
}

@media (min-width: 576px) {
    .container { max-width: 540px; }
}

@media (min-width: 768px) {
    .container { max-width: 720px; }
}

@media (min-width: 992px) {
    .container { max-width: 960px; }
}

@media (min-width: 1200px) {
    .container { max-width: 1140px; }
}

@media (min-width: 1400px) {
    .container { max-width: 1320px; }
}

.container-fluid {
    width: 100%;
    padding-right: var(--space-4);
    padding-left: var(--space-4);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-4);
}

.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-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Flexbox Utilities */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-row { flex-direction: row; }
.flex-row-reverse { flex-direction: row-reverse; }
.flex-col { flex-direction: column; }
.flex-col-reverse { flex-direction: column-reverse; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-wrap-reverse { flex-wrap: wrap-reverse; }

/* Flex Alignment */
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }

.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.items-center { align-items: center; }
.items-baseline { align-items: baseline; }
.items-stretch { align-items: stretch; }

.content-start { align-content: flex-start; }
.content-end { align-content: flex-end; }
.content-center { align-content: center; }
.content-between { align-content: space-between; }
.content-around { align-content: space-around; }
.content-stretch { align-content: stretch; }

/* Flex Sizing */
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-initial { flex: 0 1 auto; }
.flex-none { flex: none; }

/* Spacing Utilities */
.m-0 { margin: 0; }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }
.m-auto { margin: auto; }

/* Margin Top/Right/Bottom/Left */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-auto { margin-top: auto; }

.mr-0 { margin-right: 0; }
.mr-1 { margin-right: var(--space-1); }
.mr-2 { margin-right: var(--space-2); }
.mr-3 { margin-right: var(--space-3); }
.mr-4 { margin-right: var(--space-4); }
.mr-5 { margin-right: var(--space-5); }
.mr-6 { margin-right: var(--space-6); }
.mr-8 { margin-right: var(--space-8); }
.mr-auto { margin-right: auto; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-auto { margin-bottom: auto; }

.ml-0 { margin-left: 0; }
.ml-1 { margin-left: var(--space-1); }
.ml-2 { margin-left: var(--space-2); }
.ml-3 { margin-left: var(--space-3); }
.ml-4 { margin-left: var(--space-4); }
.ml-5 { margin-left: var(--space-5); }
.ml-6 { margin-left: var(--space-6); }
.ml-8 { margin-left: var(--space-8); }
.ml-auto { margin-left: auto; }

/* Margin X/Y axis */
.mx-0 { margin-left: 0; margin-right: 0; }
.mx-1 { margin-left: var(--space-1); margin-right: var(--space-1); }
.mx-2 { margin-left: var(--space-2); margin-right: var(--space-2); }
.mx-3 { margin-left: var(--space-3); margin-right: var(--space-3); }
.mx-4 { margin-left: var(--space-4); margin-right: var(--space-4); }
.mx-auto { margin-left: auto; margin-right: auto; }

.my-0 { margin-top: 0; margin-bottom: 0; }
.my-1 { margin-top: var(--space-1); margin-bottom: var(--space-1); }
.my-2 { margin-top: var(--space-2); margin-bottom: var(--space-2); }
.my-3 { margin-top: var(--space-3); margin-bottom: var(--space-3); }
.my-4 { margin-top: var(--space-4); margin-bottom: var(--space-4); }
.my-auto { margin-top: auto; margin-bottom: auto; }

/* Padding Utilities */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Padding Top/Right/Bottom/Left */
.pt-0 { padding-top: 0; }
.pt-1 { padding-top: var(--space-1); }
.pt-2 { padding-top: var(--space-2); }
.pt-3 { padding-top: var(--space-3); }
.pt-4 { padding-top: var(--space-4); }
.pt-5 { padding-top: var(--space-5); }
.pt-6 { padding-top: var(--space-6); }
.pt-8 { padding-top: var(--space-8); }

.pr-0 { padding-right: 0; }
.pr-1 { padding-right: var(--space-1); }
.pr-2 { padding-right: var(--space-2); }
.pr-3 { padding-right: var(--space-3); }
.pr-4 { padding-right: var(--space-4); }
.pr-5 { padding-right: var(--space-5); }
.pr-6 { padding-right: var(--space-6); }
.pr-8 { padding-right: var(--space-8); }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: var(--space-1); }
.pb-2 { padding-bottom: var(--space-2); }
.pb-3 { padding-bottom: var(--space-3); }
.pb-4 { padding-bottom: var(--space-4); }
.pb-5 { padding-bottom: var(--space-5); }
.pb-6 { padding-bottom: var(--space-6); }
.pb-8 { padding-bottom: var(--space-8); }

.pl-0 { padding-left: 0; }
.pl-1 { padding-left: var(--space-1); }
.pl-2 { padding-left: var(--space-2); }
.pl-3 { padding-left: var(--space-3); }
.pl-4 { padding-left: var(--space-4); }
.pl-5 { padding-left: var(--space-5); }
.pl-6 { padding-left: var(--space-6); }
.pl-8 { padding-left: var(--space-8); }

/* Padding X/Y axis */
.px-0 { padding-left: 0; padding-right: 0; }
.px-1 { padding-left: var(--space-1); padding-right: var(--space-1); }
.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }

.py-0 { padding-top: 0; padding-bottom: 0; }
.py-1 { padding-top: var(--space-1); padding-bottom: var(--space-1); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }

/* Position Utilities */
.static { position: static; }
.fixed { position: fixed; }
.absolute { position: absolute; }
.relative { position: relative; }
.sticky { position: sticky; }

/* Position Values */
.top-0 { top: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }

/* ============================================
   4. TYPOGRAPHY STYLES
   ============================================ */

/* Base Typography */
body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* Headings */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    margin-top: 0;
    margin-bottom: var(--space-2);
    font-weight: 600;
    line-height: var(--leading-tight);
}

h1, .h1 { font-size: var(--text-4xl); }
h2, .h2 { font-size: var(--text-3xl); }
h3, .h3 { font-size: var(--text-2xl); }
h4, .h4 { font-size: var(--text-xl); }
h5, .h5 { font-size: var(--text-2xl); font-weight: var(--font-bold)}
h6, .h6 { font-size: var(--text-base); }

/* Display Headings */
.display-1 { font-size: var(--text-6xl); font-weight: 300; line-height: var(--leading-none); }
.display-2 { font-size: var(--text-5xl); font-weight: 300; line-height: var(--leading-none); }
.display-3 { font-size: var(--text-4xl); font-weight: 300; line-height: var(--leading-tight); }
.display-4 { font-size: var(--text-3xl); font-weight: 300; line-height: var(--leading-tight); }

/* Paragraphs */
p {
    margin-top: 0;
    margin-bottom: var(--space-4);
}

/* Lead Text */
.lead {
    font-size: var(--text-xl);
    font-weight: 300;
    line-height: var(--leading-relaxed);
}

/* Text Sizes */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }
.text-6xl { font-size: var(--text-6xl); }

/* Font Weights */
.font-thin { font-weight: 100; }
.font-extralight { font-weight: 200; }
.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-black { font-weight: 900; }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

/* Text Colors */
.text-primary { color: var(--color-primary-600); }
.text-secondary { color: var(--color-secondary-600); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-info { color: var(--color-info); }
.text-muted { color: var(--text-muted); }
.text-white { color: #ffffff; }
.text-black { color: #000000; }

/* Text Decoration */
.underline { text-decoration: underline; }
.line-through { text-decoration: line-through; }
.no-underline { text-decoration: none; }

/* Text Transform */
.uppercase { text-transform: uppercase; }
.lowercase { text-transform: lowercase; }
.capitalize { text-transform: capitalize; }
.normal-case { text-transform: none; }

/* Font Style */
.italic { font-style: italic; }
.not-italic { font-style: normal; }

/* Lists */
ul, ol {
    margin-top: 0;
    margin-bottom: var(--space-4);
    padding-left: var(--space-6);
}

ul ul, ul ol, ol ul, ol ol {
    margin-bottom: 0;
}

.list-none { list-style: none; padding-left: 0; }
.list-disc { list-style-type: disc; }
.list-decimal { list-style-type: decimal; }

/* Links */
a {
    color: var(--color-primary-800);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-800);
    text-decoration: underline;
}

.link-primary { color: var(--color-primary-600); }
.link-secondary { color: var(--color-secondary-600); }
.link-success { color: var(--color-success); }
.link-warning { color: var(--color-warning); }
.link-error { color: var(--color-error); }
.link-info { color: var(--color-info); }

/* ============================================
   5. COMPONENT STYLES
   ============================================ */

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    border-radius: var(--radius-base);
    transition: all var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn:focus {
    outline: 0;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    color: #fff;
    background-color: var(--color-primary-600);
    border-color: var(--color-primary-600);
}

.btn-primary:hover {
    background-color: var(--color-primary-700);
    border-color: var(--color-primary-700);
}

.btn-secondary {
    color: #fff;
    background-color: var(--color-secondary-600);
    border-color: var(--color-secondary-600);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-700);
    border-color: var(--color-secondary-700);
}

.btn-success {
    color: #fff;
    background-color: var(--color-success);
    border-color: var(--color-success);
}

.btn-warning {
    color: #212529;
    background-color: var(--color-warning);
    border-color: var(--color-warning);
}

.btn-error {
    color: #fff;
    background-color: var(--color-error);
    border-color: var(--color-error);
}

.btn-info {
    color: #fff;
    background-color: var(--color-info);
    border-color: var(--color-info);
}

/* Outline Buttons */
.btn-outline-primary {
    color: var(--color-primary-600);
    background-color: transparent;
    border-color: var(--color-primary-600);
}

.btn-outline-primary:hover {
    color: #fff;
    background-color: var(--color-primary-600);
}

.btn-outline-secondary {
    color: var(--color-secondary-600);
    background-color: transparent;
    border-color: var(--color-secondary-600);
}

.btn-outline-secondary:hover {
    color: #fff;
    background-color: var(--color-secondary-600);
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-sm);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-lg);
}

.btn-xl {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-xl);
}

/* Block Button */
.btn-block {
    display: block;
    width: 100%;
}

/* Icon Buttons */
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border-radius: var(--radius-full);
}

.btn-icon-sm {
    width: 2rem;
    height: 2rem;
}

.btn-icon-lg {
    width: 3rem;
    height: 3rem;
}

/* Forms */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: inline-block;
    margin-bottom: var(--space-2);
    font-weight: 500;
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    background-clip: padding-box;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border-color: var(--color-primary-500);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
}

.form-control::placeholder {
    color: var(--text-muted);
    opacity: 1;
}

.form-control:disabled {
    background-color: var(--color-gray-100);
    opacity: 1;
}

/* Input Sizes */
.form-control-sm {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-sm);
}

.form-control-lg {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-lg);
}

/* Textarea */
textarea.form-control {
    min-height: calc(var(--leading-normal) * 1em + var(--space-2) * 2 + 2px);
}

/* Select */
select.form-control {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='currentColor' stroke-linecap='round' stroke-linejoin='round' stroke-width='2'%3e%3cpolyline points='2 5 6 9 10 5'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    background-size: 12px;
    padding-right: var(--space-8);
}

/* Checkboxes and Radios */
.form-check {
    display: block;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
}

.form-check-input {
    position: absolute;
    margin-left: calc(var(--space-6) * -1);
}

.form-check-label {
    margin-bottom: 0;
}

/* Form Validation States */
.is-valid {
    border-color: var(--color-success);
}

.is-invalid {
    border-color: var(--color-error);
}

.valid-feedback,
.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: var(--space-1);
    font-size: var(--text-sm);
}

.valid-feedback {
    color: var(--color-success);
}

.invalid-feedback {
    color: var(--color-error);
}

.is-valid ~ .valid-feedback,
.is-invalid ~ .invalid-feedback {
    display: block;
}

/* Cards */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: var(--bg-primary);
    background-clip: border-box;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-base);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: var(--space-3) var(--space-4);
    margin-bottom: 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--color-gray-200);
    border-radius: calc(var(--radius-base) - 1px) calc(var(--radius-base) - 1px) 0 0;
}

.card-body {
    flex: 1 1 auto;
    padding: var(--space-4);
}

.card-footer {
    padding: var(--space-3) var(--space-4);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--color-gray-200);
    border-radius: 0 0 calc(var(--radius-base) - 1px) calc(var(--radius-base) - 1px);
}

.card-title {
    margin-bottom: var(--space-3);
}

.card-subtitle {
    margin-top: calc(var(--space-3) * -0.5);
    margin-bottom: 0;
    color: var(--text-muted);
}

.card-text:last-child {
    margin-bottom: 0;
}

/* Card Variants */
.card-primary {
    border-color: var(--color-primary-600);
}

.card-primary .card-header {
    background-color: var(--color-primary-600);
    color: white;
    border-color: var(--color-primary-600);
}

/* Navigation */
.nav {
    display: flex;
    flex-wrap: wrap;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.nav-link {
    display: block;
    padding: var(--space-2) var(--space-4);
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary-600);
}

.nav-link.active {
    color: var(--color-primary-600);
    font-weight: 500;
}

.nav-link.disabled {
    color: var(--text-muted);
    pointer-events: none;
    cursor: default;
}

/* Tabs */
.nav-tabs {
    border-bottom: 1px solid var(--color-gray-300);
}

.nav-tabs .nav-link {
    margin-bottom: -1px;
    border: 1px solid transparent;
    border-radius: var(--radius-base) var(--radius-base) 0 0;
}

.nav-tabs .nav-link:hover {
    border-color: var(--color-gray-200) var(--color-gray-200) var(--color-gray-300);
}

.nav-tabs .nav-link.active {
    background-color: var(--bg-primary);
    border-color: var(--color-gray-300) var(--color-gray-300) var(--bg-primary);
}

/* Pills */
.nav-pills .nav-link {
    border-radius: var(--radius-base);
}

.nav-pills .nav-link.active {
    color: #fff;
    background-color: var(--color-primary-600);
}

/* Navbar */
.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-4);
}

.navbar-brand {
    display: inline-block;
    padding-top: var(--space-1);
    padding-bottom: var(--space-1);
    margin-right: var(--space-4);
    font-size: var(--text-xl);
    font-weight: 600;
    line-height: inherit;
    white-space: nowrap;
}

.navbar-nav {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.navbar-nav .nav-link {
    padding-right: 0;
    padding-left: 0;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-4);
    list-style: none;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-base);
}

.breadcrumb-item + .breadcrumb-item {
    padding-left: var(--space-2);
}

.breadcrumb-item + .breadcrumb-item::before {
    display: inline-block;
    padding-right: var(--space-2);
    color: var(--text-muted);
    content: "/";
}

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

/* Pagination */
.pagination {
    display: flex;
    padding-left: 0;
    list-style: none;
}

.page-link {
    position: relative;
    display: block;
    padding: var(--space-2) var(--space-3);
    margin-left: -1px;
    line-height: var(--leading-normal);
    color: var(--color-primary-600);
    text-decoration: none;
    background-color: var(--bg-primary);
    border: 1px solid var(--color-gray-300);
    transition: all var(--transition-fast);
}

.page-link:hover {
    z-index: 2;
    color: var(--color-primary-800);
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-300);
}

.page-item.active .page-link {
    z-index: 3;
    color: #fff;
    background-color: var(--color-primary-600);
    border-color: var(--color-primary-600);
}

.page-item.disabled .page-link {
    color: var(--text-muted);
    pointer-events: none;
    background-color: var(--bg-primary);
    border-color: var(--color-gray-300);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-modal);
    width: 100%;
    height: 100%;
    overflow: hidden;
    outline: 0;
}

.modal-dialog {
    position: relative;
    width: auto;
    margin: var(--space-4);
    pointer-events: none;
}

.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    pointer-events: auto;
    background-color: var(--bg-primary);
    background-clip: padding-box;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    outline: 0;
}

.modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-gray-200);
    border-radius: calc(var(--radius-lg) - 1px) calc(var(--radius-lg) - 1px) 0 0;
}

.modal-title {
    margin-bottom: 0;
    line-height: var(--leading-normal);
}

.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: var(--space-4);
}

.modal-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--color-gray-200);
    border-radius: 0 0 calc(var(--radius-lg) - 1px) calc(var(--radius-lg) - 1px);
}

.modal-footer > * {
    margin: var(--space-1);
}

/* Modal Backdrop */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    z-index: calc(var(--z-modal) - 10);
    width: 100vw;
    height: 100vh;
    background-color: #000;
    opacity: 0.5;
}

/* Alert */
.alert {
    position: relative;
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-4);
    border: 1px solid transparent;
    border-radius: var(--radius-base);
}

.alert-primary {
    color: #004085;
    background-color: #cce5ff;
    border-color: #b8daff;
}

.alert-secondary {
    color: #383d41;
    background-color: #e2e3e5;
    border-color: #d6d8db;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

.alert-error {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}

/* Badge */
.badge {
    display: inline-block;
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-base);
}

.badge-primary {
    color: #fff;
    background-color: var(--color-primary-600);
}

.badge-secondary {
    color: #fff;
    background-color: var(--color-secondary-600);
}

.badge-success {
    color: #fff;
    background-color: var(--color-success);
}

.badge-warning {
    color: #212529;
    background-color: var(--color-warning);
}

.badge-error {
    color: #fff;
    background-color: var(--color-error);
}

.badge-info {
    color: #fff;
    background-color: var(--color-info);
}

/* Avatar */
.avatar {
    position: relative;
    display: inline-block;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-sm {
    width: 2rem;
    height: 2rem;
}

.avatar-lg {
    width: 3rem;
    height: 3rem;
}

.avatar-xl {
    width: 4rem;
    height: 4rem;
}

/* List Group */
.list-group {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    border-radius: var(--radius-base);
}

.list-group-item {
    position: relative;
    display: block;
    padding: var(--space-3) var(--space-4);
    background-color: var(--bg-primary);
    border: 1px solid var(--color-gray-200);
}

.list-group-item:first-child {
    border-top-left-radius: inherit;
    border-top-right-radius: inherit;
}

.list-group-item:last-child {
    border-bottom-right-radius: inherit;
    border-bottom-left-radius: inherit;
}

.list-group-item + .list-group-item {
    border-top-width: 0;
}

.list-group-item.active {
    z-index: 2;
    color: #fff;
    background-color: var(--color-primary-600);
    border-color: var(--color-primary-600);
}

/* Progress */
.progress {
    display: flex;
    height: 1rem;
    overflow: hidden;
    font-size: var(--text-sm);
    background-color: var(--color-gray-200);
    border-radius: var(--radius-base);
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    color: #fff;
    text-align: center;
    white-space: nowrap;
    background-color: var(--color-primary-600);
    transition: width 0.6s ease;
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: text-bottom;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner 0.75s linear infinite;
}

.spinner-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.2em;
}

.spinner-lg {
    width: 3rem;
    height: 3rem;
}

@keyframes spinner {
    to { transform: rotate(360deg); }
}

/* Tooltip */
.tooltip {
    position: absolute;
    z-index: var(--z-tooltip);
    display: block;
    margin: 0;
    font-size: var(--text-sm);
    word-wrap: break-word;
    opacity: 0;
    pointer-events: none;
}

.tooltip.show {
    opacity: 0.9;
}

.tooltip-inner {
    max-width: 200px;
    padding: var(--space-1) var(--space-2);
    color: #fff;
    text-align: center;
    background-color: #000;
    border-radius: var(--radius-base);
}

/* ============================================
   6. INTERACTIVE ELEMENTS
   ============================================ */

/* Hover Effects */
.hover\:shadow-sm:hover { box-shadow: var(--shadow-sm); }
.hover\:shadow:hover { box-shadow: var(--shadow-base); }
.hover\:shadow-md:hover { box-shadow: var(--shadow-md); }
.hover\:shadow-lg:hover { box-shadow: var(--shadow-lg); }
.hover\:shadow-xl:hover { box-shadow: var(--shadow-xl); }
.hover\:shadow-2xl:hover { box-shadow: var(--shadow-2xl); }

.hover\:scale-105:hover { transform: scale(1.05); }
.hover\:scale-110:hover { transform: scale(1.1); }

/* Focus States */
:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.focus\:outline-none:focus {
    outline: 2px solid transparent;
    outline-offset: 2px;
}

.focus\:ring:focus {
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
}

/* Active States */
.active\:bg-primary-700:active { background-color: var(--color-primary-700); }
.active\:scale-95:active { transform: scale(0.95); }

/* Transitions */
.transition-none { transition-property: none; }
.transition-all { transition-property: all; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition { transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-colors { transition-property: background-color, border-color, color, fill, stroke; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-opacity { transition-property: opacity; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-shadow { transition-property: box-shadow; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.transition-transform { transition-property: transform; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }

/* Duration */
.duration-75 { transition-duration: 75ms; }
.duration-100 { transition-duration: 100ms; }
.duration-150 { transition-duration: 150ms; }
.duration-200 { transition-duration: 200ms; }
.duration-300 { transition-duration: 300ms; }
.duration-500 { transition-duration: 500ms; }
.duration-700 { transition-duration: 700ms; }
.duration-1000 { transition-duration: 1000ms; }

/* Easing */
.ease-linear { transition-timing-function: linear; }
.ease-in { transition-timing-function: cubic-bezier(0.4, 0, 1, 1); }
.ease-out { transition-timing-function: cubic-bezier(0, 0, 0.2, 1); }
.ease-in-out { transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); }

/* ============================================
   7. UTILITY CLASSES
   ============================================ */

/* Display */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.inline-grid { display: inline-grid; }
.hidden { display: none; }

/* Visibility */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Opacity */
.opacity-0 { opacity: 0; }
.opacity-25 { opacity: 0.25; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Width */
.w-0 { width: 0; }
.w-1 { width: 0.25rem; }
.w-2 { width: 0.5rem; }
.w-4 { width: 1rem; }
.w-8 { width: 2rem; }
.w-16 { width: 4rem; }
.w-32 { width: 8rem; }
.w-64 { width: 16rem; }
.w-auto { width: auto; }
.w-1\/2 { width: 50%; }
.w-1\/3 { width: 33.333333%; }
.w-2\/3 { width: 66.666667%; }
.w-1\/4 { width: 25%; }
.w-3\/4 { width: 75%; }
.w-full { width: 100%; }
.w-screen { width: 100vw; }

/* Height */
.h-0 { height: 0; }
.h-1 { height: 0.25rem; }
.h-2 { height: 0.5rem; }
.h-4 { height: 1rem; }
.h-8 { height: 2rem; }
.h-16 { height: 4rem; }
.h-32 { height: 8rem; }
.h-64 { height: 16rem; }
.h-auto { height: auto; }
.h-full { height: 100%; }
.h-screen { height: 100vh; }

/* Min/Max Width & Height */
.min-w-0 { min-width: 0; }
.min-w-full { min-width: 100%; }
.max-w-xs { max-width: 20rem; }
.max-w-sm { max-width: 24rem; }
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }
.max-w-xl { max-width: 36rem; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }
.max-w-4xl { max-width: 56rem; }
.max-w-5xl { max-width: 64rem; }
.max-w-6xl { max-width: 72rem; }
.max-w-full { max-width: 100%; }

.min-h-0 { min-height: 0; }
.min-h-full { min-height: 100%; }
.min-h-screen { min-height: 100vh; }

/* Overflow */
.overflow-auto { overflow: auto; }
.overflow-hidden { overflow: hidden; }
.overflow-visible { overflow: visible; }
.overflow-scroll { overflow: scroll; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }
.overflow-x-hidden { overflow-x: hidden; }
.overflow-y-hidden { overflow-y: hidden; }
.overflow-x-scroll { overflow-x: scroll; }
.overflow-y-scroll { overflow-y: scroll; }

/* Z-index */
.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-30 { z-index: 30; }
.z-40 { z-index: 40; }
.z-50 { z-index: 50; }
.z-auto { z-index: auto; }

/* Borders */
.border { border-width: 1px; }
.border-0 { border-width: 0; }
.border-2 { border-width: 2px; }
.border-4 { border-width: 4px; }
.border-8 { border-width: 8px; }

.border-t { border-top-width: 1px; }
.border-r { border-right-width: 1px; }
.border-b { border-bottom-width: 1px; }
.border-l { border-left-width: 1px; }

.border-solid { border-style: solid; }
.border-dashed { border-style: dashed; }
.border-dotted { border-style: dotted; }
.border-none { border-style: none; }

/* Border Colors */
.border-transparent { border-color: transparent; }
.border-black { border-color: #000; }
.border-white { border-color: #fff; }
.border-gray-100 { border-color: var(--color-gray-100); }
.border-gray-200 { border-color: var(--color-gray-200); }
.border-gray-300 { border-color: var(--color-gray-300); }
.border-gray-400 { border-color: var(--color-gray-400); }
.border-gray-500 { border-color: var(--color-gray-500); }
.border-gray-600 { border-color: var(--color-gray-600); }
.border-gray-700 { border-color: var(--color-gray-700); }
.border-gray-800 { border-color: var(--color-gray-800); }
.border-gray-900 { border-color: var(--color-gray-900); }

/* Border Radius */
.rounded-none { border-radius: 0; }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-3xl { border-radius: var(--radius-3xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-none { box-shadow: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-base); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-2xl { box-shadow: var(--shadow-2xl); }

/* Cursor */
.cursor-auto { cursor: auto; }
.cursor-default { cursor: default; }
.cursor-pointer { cursor: pointer; }
.cursor-wait { cursor: wait; }
.cursor-text { cursor: text; }
.cursor-move { cursor: move; }
.cursor-not-allowed { cursor: not-allowed; }
.cursor-grab { cursor: grab; }
.cursor-grabbing { cursor: grabbing; }

/* Background Colors */
.bg-transparent { background-color: transparent; }
.bg-black { background-color: #000; }
.bg-white { background-color: #fff; }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-200 { background-color: var(--color-gray-200); }
.bg-gray-300 { background-color: var(--color-gray-300); }
.bg-gray-400 { background-color: var(--color-gray-400); }
.bg-gray-500 { background-color: var(--color-gray-500); }
.bg-gray-600 { background-color: var(--color-gray-600); }
.bg-gray-700 { background-color: var(--color-gray-700); }
.bg-gray-800 { background-color: var(--color-gray-800); }
.bg-gray-900 { background-color: var(--color-gray-900); }
.bg-primary { background-color: var(--color-primary-500); }
.bg-secondary { background-color: var(--color-secondary-500); }
.bg-success { background-color: var(--color-success); }
.bg-warning { background-color: var(--color-warning); }
.bg-error { background-color: var(--color-error); }
.bg-info { background-color: var(--color-info); }

/* ============================================
   8. ANIMATION AND TRANSITION CLASSES
   ============================================ */

/* Keyframe Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

@keyframes slideInLeft {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes slideInUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

@keyframes slideInDown {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-30px); }
    60% { transform: translateY(-15px); }
}

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

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

/* Animation Classes */
.animate-fadeIn { animation: fadeIn 0.5s ease-in-out; }
.animate-fadeOut { animation: fadeOut 0.5s ease-in-out; }
.animate-slideInRight { animation: slideInRight 0.5s ease-out; }
.animate-slideInLeft { animation: slideInLeft 0.5s ease-out; }
.animate-slideInUp { animation: slideInUp 0.5s ease-out; }
.animate-slideInDown { animation: slideInDown 0.5s ease-out; }
.animate-bounce { animation: bounce 1s ease-in-out infinite; }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Transform Utilities */
.transform { transform: translateZ(0); }
.transform-none { transform: none; }
.scale-0 { transform: scale(0); }
.scale-50 { transform: scale(0.5); }
.scale-75 { transform: scale(0.75); }
.scale-90 { transform: scale(0.9); }
.scale-95 { transform: scale(0.95); }
.scale-100 { transform: scale(1); }
.scale-105 { transform: scale(1.05); }
.scale-110 { transform: scale(1.1); }
.scale-125 { transform: scale(1.25); }
.scale-150 { transform: scale(1.5); }

.rotate-0 { transform: rotate(0deg); }
.rotate-45 { transform: rotate(45deg); }
.rotate-90 { transform: rotate(90deg); }
.rotate-180 { transform: rotate(180deg); }
.-rotate-45 { transform: rotate(-45deg); }
.-rotate-90 { transform: rotate(-90deg); }
.-rotate-180 { transform: rotate(-180deg); }

.translate-x-0 { transform: translateX(0); }
.translate-x-1 { transform: translateX(0.25rem); }
.translate-x-2 { transform: translateX(0.5rem); }
.translate-x-4 { transform: translateX(1rem); }
.-translate-x-1 { transform: translateX(-0.25rem); }
.-translate-x-2 { transform: translateX(-0.5rem); }
.-translate-x-4 { transform: translateX(-1rem); }

.translate-y-0 { transform: translateY(0); }
.translate-y-1 { transform: translateY(0.25rem); }
.translate-y-2 { transform: translateY(0.5rem); }
.translate-y-4 { transform: translateY(1rem); }
.-translate-y-1 { transform: translateY(-0.25rem); }
.-translate-y-2 { transform: translateY(-0.5rem); }
.-translate-y-4 { transform: translateY(-1rem); }

/* ============================================
   9. RESPONSIVE MEDIA QUERIES
   ============================================ */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
    .sm\:container { max-width: 540px; }
    .sm\:hidden { display: none; }
    .sm\:block { display: block; }
    .sm\:inline-block { display: inline-block; }
    .sm\:flex { display: flex; }
    .sm\:grid { display: grid; }
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .sm\:flex-row { flex-direction: row; }
    .sm\:flex-col { flex-direction: column; }
    .sm\:text-sm { font-size: var(--text-sm); }
    .sm\:text-base { font-size: var(--text-base); }
    .sm\:text-lg { font-size: var(--text-lg); }
    .sm\:p-4 { padding: var(--space-4); }
    .sm\:m-4 { margin: var(--space-4); }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    .md\:container { max-width: 720px; }
    .md\:hidden { display: none; }
    .md\:block { display: block; }
    .md\:inline-block { display: inline-block; }
    .md\:flex { display: flex; }
    .md\:grid { display: grid; }
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .md\:flex-row { flex-direction: row; }
    .md\:flex-col { flex-direction: column; }
    .md\:text-base { font-size: var(--text-base); }
    .md\:text-lg { font-size: var(--text-lg); }
    .md\:text-xl { font-size: var(--text-xl); }
    .md\:p-6 { padding: var(--space-6); }
    .md\:m-6 { margin: var(--space-6); }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .lg\:container { max-width: 960px; }
    .lg\:hidden { display: none; }
    .lg\:block { display: block; }
    .lg\:inline-block { display: inline-block; }
    .lg\:flex { display: flex; }
    .lg\:grid { display: grid; }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .lg\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
    .lg\:flex-row { flex-direction: row; }
    .lg\:flex-col { flex-direction: column; }
    .lg\:text-lg { font-size: var(--text-lg); }
    .lg\:text-xl { font-size: var(--text-xl); }
    .lg\:text-2xl { font-size: var(--text-2xl); }
    .lg\:p-8 { padding: var(--space-8); }
    .lg\:m-8 { margin: var(--space-8); }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .xl\:container { max-width: 1140px; }
    .xl\:hidden { display: none; }
    .xl\:block { display: block; }
    .xl\:inline-block { display: inline-block; }
    .xl\:flex { display: flex; }
    .xl\:grid { display: grid; }
    .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .xl\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
    .xl\:grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* Extra extra large devices (larger desktops, 1400px and up) */
@media (min-width: 1400px) {
    .xxl\:container { max-width: 1320px; }
}

/* ============================================
   10. PRINT STYLES
   ============================================ */

@media print {
    *,
    *::before,
    *::after {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    a,
    a:visited {
        text-decoration: underline;
    }

    a[href]::after {
        content: " (" attr(href) ")";
    }

    abbr[title]::after {
        content: " (" attr(title) ")";
    }

    a[href^="#"]::after,
    a[href^="javascript:"]::after {
        content: "";
    }

    pre {
        white-space: pre-wrap !important;
    }

    pre,
    blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }

    thead {
        display: table-header-group;
    }

    tr,
    img {
        page-break-inside: avoid;
    }

    p,
    h2,
    h3 {
        orphans: 3;
        widows: 3;
    }

    h2,
    h3 {
        page-break-after: avoid;
    }

    .no-print {
        display: none !important;
    }
}

/* ============================================
   11. ACCESSIBILITY FEATURES
   ============================================ */

/* 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-width: 0;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Skip to Content */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--space-2);
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary-600: #0066cc;
        --color-gray-300: #767676;
        --text-muted: #595959;
    }

    .btn,
    .form-control,
    .card {
        border-width: 2px;
    }
}

/* ============================================
   12. COURSE SCHEDULE SPECIFIC STYLES
   ============================================ */

/* Schedule Container */
.course-schedule {
    max-width: 1000px;
    margin: 0 auto;
}

/* Topic Container */
.topic-container {
    margin-bottom: var(--space-4);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-base);
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast);
}

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

/* Topic Header */
.topic-header {
    display: flex;
    align-items: center;
    padding: var(--space-4);
    cursor: pointer;
    user-select: none;
    transition: background-color var(--transition-fast);
}

.topic-header:hover {
    background-color: var(--bg-secondary);
}

.topic-header:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: -2px;
}

/* Topic Arrow */
.topic-arrow {
    font-size: var(--text-xl);
    margin-right: var(--space-3);
    transition: transform var(--transition-fast);
    color: var(--text-muted);
}

.topic-container[aria-expanded="true"] .topic-arrow {
    transform: rotate(90deg);
}

/* Topic Info */
.topic-info {
    flex: 1;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-4);
    align-items: center;
}

.topic-number {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-primary-600);
    margin: 0;
}

.topic-title {
    font-size: var(--text-lg);
    font-weight: 500;
    margin: 0;
    color: var(--text-primary);
}

.topic-date {
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-weight: 500;
}

/* Topic Content */
.topic-content {
    padding: 0 var(--space-4) var(--space-4);
    border-top: 1px solid var(--color-gray-100);
}

.topic-content[hidden] {
    display: none;
}

/* Content Sections */
.content-section {
    margin-top: var(--space-4);
    padding-left: calc(var(--space-8) + var(--space-3));
}

.content-heading {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

/* Reading List */
.reading-list {
    list-style-type: disc;
    padding-left: var(--space-5);
    margin: 0;
}

.reading-list li {
    margin-bottom: var(--space-1);
    color: var(--text-primary);
}

.reading-list a {
    color: var(--color-primary-600);
    text-decoration: none;
}

.reading-list a:hover {
    text-decoration: underline;
}

/* Assignment Item */
.assignment-item {
    background-color: var(--bg-secondary);
    padding: var(--space-3);
    border-radius: var(--radius-base);
    border-left: 3px solid var(--color-primary-500);
}

.assignment-item p {
    margin: 0;
}

.assignment-item p:first-child {
    margin-bottom: var(--space-1);
}

/* Site Header/Footer */
.site-header {
    background-color: var(--bg-secondary);
    padding: var(--space-8) 0;
    margin-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-gray-200);
}

.site-footer {
    background-color: var(--bg-secondary);
    padding: var(--space-6) 0;
    border-top: 1px solid var(--color-gray-200);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 300px);
    padding-bottom: var(--space-8);
}

/* Responsive Adjustments for Schedule */
@media (max-width: 768px) {
    .topic-info {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }

    .topic-number,
    .topic-title,
    .topic-date {
        text-align: left;
    }

    .content-section {
        padding-left: var(--space-4);
    }
}

/* Print Styles for Schedule */
@media print {
    .topic-container {
        page-break-inside: avoid;
    }

    .topic-arrow {
        display: none;
    }

    .topic-content {
        display: block !important;
    }

    .btn {
        display: none;
    }
}