/* ========================================
   BookNest Design System
   Global Styles & Variables
   ======================================== */

/* CSS Variables / Design Tokens */
:root {
    /* Primary Colors - Clean, modern palette */
    --color-primary: #6366F1;
    --color-primary-dark: #4F46E5;
    --color-primary-light: #818CF8;
    --color-primary-50: #EEF2FF;
    --color-primary-100: #E0E7FF;
    
    /* Secondary Colors - Subtle warmth */
    --color-secondary: #F59E0B;
    --color-secondary-dark: #D97706;
    --color-secondary-light: #FBBF24;
    
    /* Accent Colors */
    --color-accent: #10B981;
    --color-accent-light: #34D399;
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F4F4F5;
    --color-gray-200: #E4E4E7;
    --color-gray-300: #D4D4D8;
    --color-gray-400: #A1A1AA;
    --color-gray-500: #71717A;
    --color-gray-600: #52525B;
    --color-gray-700: #3F3F46;
    --color-gray-800: #27272A;
    --color-gray-900: #18181B;
    --color-black: #0a0a0b;
    
    /* Semantic Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    
    /* Spoiler System Colors */
    --spoiler-free: #10B981;
    --spoiler-free-bg: #ECFDF5;
    --spoiler-warning: #F59E0B;
    --spoiler-warning-bg: #FFFBEB;
    --spoiler-danger: #EF4444;
    --spoiler-danger-bg: #FEF2F2;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-body: 'Source Sans 3', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Font Weights */
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.04);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.04);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.15);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.04);
    --shadow-glow: 0 0 20px rgb(99 102 241 / 0.15);
    
    /* Transitions - Smoother cubic-bezier curves */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Focus ring for accessibility */
    --focus-ring: 0 0 0 3px var(--color-primary-100), 0 0 0 1px var(--color-primary);
    --focus-ring-offset: 0 0 0 2px var(--color-white), 0 0 0 4px var(--color-primary);
    
    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    
    /* Container */
    --container-max: 1280px;
    --container-padding: var(--space-6);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-primary: #A78BFA;
    --color-primary-dark: #8B5CF6;
    --color-primary-light: #C4B5FD;
    
    --color-white: #18181B;
    --color-gray-50: #1f1f23;
    --color-gray-100: #27272A;
    --color-gray-200: #3F3F46;
    --color-gray-300: #52525B;
    --color-gray-400: #71717A;
    --color-gray-500: #A1A1AA;
    --color-gray-600: #D4D4D8;
    --color-gray-700: #E4E4E7;
    --color-gray-800: #F4F4F5;
    --color-gray-900: #FAFAFA;
    --color-black: #FFFFFF;
}

/* ========================================
   CSS Reset & Base Styles
   ======================================== */

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

/* Reduced motion for accessibility */
@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;
    }
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    line-height: var(--leading-normal);
    color: var(--color-gray-800);
    background-color: var(--color-white);
    min-height: 100vh;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-3) var(--space-5);
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    font-weight: var(--font-semibold);
    text-decoration: none;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
    outline: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--color-gray-900);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

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

a:hover {
    color: var(--color-primary);
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Disable button when disabled */
button:disabled,
button[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

ul, ol {
    list-style: none;
}

/* Icon alignment utilities */
svg {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}

/* Ensure inline SVGs align with text */
.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1em;
    height: 1em;
    vertical-align: -0.125em;
}

/* ========================================
   Layout Utilities
   ======================================== */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-16) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.section-title i {
    color: var(--color-primary);
    font-size: var(--text-2xl);
}

.section-title h2 {
    margin: 0;
}

.view-all {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: var(--font-semibold);
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.view-all:hover {
    gap: var(--space-3);
}

/* ========================================
   Button Components
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

/* Button icon alignment */
.btn svg {
    width: 1.125em;
    height: 1.125em;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
    color: var(--color-white);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:focus-visible {
    box-shadow: var(--focus-ring);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-secondary:focus-visible {
    box-shadow: var(--focus-ring);
}

.btn-ghost {
    background: transparent;
    color: var(--color-gray-600);
}

.btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
}

.btn-ghost:focus-visible {
    box-shadow: var(--focus-ring);
}

.btn-glass {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-white);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.25);
    color: var(--color-white);
}

.btn-white {
    background: var(--color-white);
    color: var(--color-primary);
}

.btn-white:hover {
    background: var(--color-gray-50);
    box-shadow: var(--shadow-md);
    color: var(--color-primary-dark);
}

.btn-outline-white {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: var(--color-white);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
    color: var(--color-white);
}

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

.btn-icon {
    padding: var(--space-3);
    width: 44px;
    height: 44px;
}

/* Proper icon alignment in icon buttons */
.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-icon i {
    font-size: var(--text-lg);
    line-height: 1;
}

/* ========================================
   Navigation
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-100);
    transition: all var(--transition-base);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-3) var(--container-padding);
    min-height: 64px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-primary);
    text-decoration: none;
}

/* Logo SVG alignment */
.logo svg {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.logo i {
    font-size: var(--text-2xl);
    line-height: 1;
}

.logo:hover {
    color: var(--color-primary);
}

.logo:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.nav-search {
    flex: 1;
    max-width: 400px;
    position: relative;
    display: none;
}

@media (min-width: 768px) {
    .nav-search {
        display: block;
    }
}

/* Search icon alignment */
.nav-search svg {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-400);
    width: 18px;
    height: 18px;
    pointer-events: none;
}

.nav-search i {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-400);
    line-height: 1;
}

.nav-search input {
    width: 100%;
    padding: var(--space-3) var(--space-4) var(--space-3) var(--space-10);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    background: var(--color-gray-50);
    transition: all var(--transition-fast);
}

.nav-search input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 4px var(--color-primary-50);
}

.nav-search input::placeholder {
    color: var(--color-gray-400);
}

.nav-links {
    display: none;
    align-items: center;
    gap: var(--space-6);
}

@media (min-width: 1024px) {
    .nav-links {
        display: flex;
    }
}

.nav-links a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: var(--font-medium);
    color: var(--color-gray-600);
    padding: var(--space-2) 0;
    position: relative;
    text-decoration: none;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.nav-links a:focus-visible::after {
    display: none;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-actions .btn-ghost {
    display: none;
}

@media (min-width: 768px) {
    .nav-actions .btn-ghost {
        display: flex;
    }
}

.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.hamburger:hover {
    background: var(--color-gray-100);
}

.hamburger:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

@media (min-width: 1024px) {
    .hamburger {
        display: none;
    }
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--space-4);
    z-index: var(--z-dropdown);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.mobile-menu-content a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    transition: background var(--transition-fast);
}

.mobile-menu-content a:hover {
    background: var(--color-gray-100);
    color: var(--color-primary);
}

/* ========================================
   Avatar Component
   ======================================== */

.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-primary-100);
    color: var(--color-primary);
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    flex-shrink: 0;
    user-select: none;
}

.avatar-sm {
    width: 32px;
    height: 32px;
    font-size: var(--text-xs);
}

.avatar-lg {
    width: 56px;
    height: 56px;
    font-size: var(--text-lg);
}

/* ========================================
   Spoiler System
   ======================================== */

.spoiler-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

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

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

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

.spoiler-blur {
    filter: blur(5px);
    user-select: none;
    transition: filter var(--transition-base);
}

.spoiler-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    color: var(--color-white);
    font-size: var(--text-sm);
    cursor: pointer;
    opacity: 1;
    transition: opacity var(--transition-fast);
    border-radius: inherit;
}

/* Spoiler overlay icon alignment */
.spoiler-overlay svg {
    width: 24px;
    height: 24px;
}

.spoiler-overlay i {
    font-size: var(--text-2xl);
    line-height: 1;
}

.spoiler-revealed .spoiler-blur {
    filter: none;
}

.spoiler-revealed .spoiler-overlay {
    opacity: 0;
    pointer-events: none;
}

/* ========================================
   Tags
   ======================================== */

.tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.genre-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    background: var(--color-primary-50);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-12);
}

@media (min-width: 640px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1.5fr;
    }
}

.footer-brand .logo {
    margin-bottom: var(--space-4);
    color: var(--color-white);
}

.footer-brand p {
    margin-bottom: var(--space-6);
    line-height: var(--leading-relaxed);
}

.social-links {
    display: flex;
    gap: var(--space-3);
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-gray-800);
    border-radius: var(--radius-lg);
    color: var(--color-gray-400);
    transition: all var(--transition-fast);
}

/* Social link icon alignment */
.social-links a svg {
    width: 18px;
    height: 18px;
}

.social-links a i {
    font-size: var(--text-lg);
    line-height: 1;
}

.social-links a:hover {
    background: var(--color-gray-700);
    color: var(--color-white);
    transform: translateY(-2px);
}

.social-links a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.footer-links h4 {
    color: var(--color-white);
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-gray-400);
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-white);
    padding-left: var(--space-2);
}

.footer-newsletter h4 {
    color: var(--color-white);
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
}

.footer-newsletter p {
    margin-bottom: var(--space-4);
    font-size: var(--text-sm);
}

.newsletter-form {
    display: flex;
    gap: var(--space-2);
}

.newsletter-form input {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-gray-700);
    border-radius: var(--radius-lg);
    background: var(--color-gray-800);
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.newsletter-form input::placeholder {
    color: var(--color-gray-500);
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.newsletter-form .btn {
    padding: var(--space-3) var(--space-4);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: left;
    }
}

.footer-bottom p {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.footer-bottom .fa-heart {
    color: var(--color-error);
}

.footer-legal {
    display: flex;
    gap: var(--space-6);
}

.footer-legal a {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.footer-legal a:hover {
    color: var(--color-white);
}

/* ========================================
   Utility Classes
   ======================================== */

/* Screen reader only - for accessibility */
.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;
}

/* Visually hidden but focusable */
.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

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

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-muted { color: var(--color-gray-500); }

.mt-auto { margin-top: auto; }
.mb-auto { margin-bottom: auto; }

/* Breadcrumb styles */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.breadcrumb a {
    color: var(--color-gray-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

.breadcrumb a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.breadcrumb-sep {
    color: var(--color-gray-400);
    user-select: none;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

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

.animate-fade-in {
    animation: fadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* Loading skeleton */
.skeleton {
    background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-gray-200: #B0B0B0;
        --color-gray-300: #909090;
        --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.2);
        --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.2);
    }
    
    .btn-primary {
        border: 2px solid var(--color-primary-dark);
    }
    
    .btn-secondary {
        border: 2px solid var(--color-gray-400);
    }
}