/* Base Styles - Modern CSS Foundation */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Account for fixed navigation */
    /* Modern CSS features */
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    /* Enhanced UX Features */
    scroll-snap-type: y proximity;
    overscroll-behavior: contain;
    /* Accessibility improvements */
    focus-visible: outline;
}

/* Respect user preferences for reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

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);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Modern performance optimizations */
    font-display: swap;
    text-rendering: optimizeLegibility;
    -webkit-font-feature-settings: "kern" 1;
    font-feature-settings: "kern" 1;
    font-kerning: normal;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: var(--text-5xl);
    font-weight: var(--font-bold);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-3xl);
}

h4 {
    font-size: var(--text-2xl);
}

h5 {
    font-size: var(--text-xl);
}

h6 {
    font-size: var(--text-lg);
}

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* Section Spacing */
section {
    padding: var(--space-16) 0;
}

@media (min-width: 768px) {
    section {
        padding: var(--space-20) 0;
    }
}

@media (min-width: 1024px) {
    section {
        padding: var(--space-24) 0;
    }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--text-5xl);
    }
    
    .section-subtitle {
        font-size: var(--text-xl);
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: 1;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

/* Enhanced Focus Management for Accessibility */
:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    transition: outline-color 0.2s ease;
}

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

/* Enhanced focus for interactive elements */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 5px rgba(102, 126, 234, 0.2);
}

/* Skip link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 6px;
}

/* Enhanced Animations & Visual Effects - Phase 2 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

/* Scroll Animation Classes */
.animate-on-scroll {
    opacity: 0;
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animate-fade-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-on-scroll.animate-fade-left {
    animation: fadeInLeft 0.6s ease-out forwards;
}

.animate-on-scroll.animate-fade-right {
    animation: fadeInRight 0.6s ease-out forwards;
}

.animate-on-scroll.animate-scale-in {
    animation: scaleIn 0.6s ease-out forwards;
}

/* Enhanced Form Styles - Phase 2 (Non-conflicting) */
.form-enhanced {
    position: relative;
}

.form-enhanced.focused label {
    transform: translateY(-20px) scale(0.85);
    color: var(--primary-color);
}

.error-message {
    color: var(--error-color, #ef4444);
    font-size: var(--text-sm);
    margin-top: var(--space-1);
    animation: fadeInUp 0.3s ease-out;
}

/* Loading Button State */
.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Enhanced Visual Polish - Phase 2 */
.card-hover-effect {
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.card-hover-effect::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
    z-index: 1;
}

.card-hover-effect:hover::before {
    left: 100%;
}

.card-hover-effect:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Enhanced Focus States */
.focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-md);
}

/* Improved Loading States */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* Enhanced Tooltips */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gray-900);
    color: white;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-smooth);
    z-index: var(--z-tooltip, 1050);
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

/* PRIMARY CTAs - High Priority/Attention-Grabbing (Amber/Gold Gradient) */
.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: var(--white);
    border: 2px solid var(--accent-gold);
    font-weight: var(--font-semibold);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-color));
    border-color: var(--secondary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:active {
    transform: translateY(0);
    transition: all 0.1s ease;
}

/* SECONDARY CTAs - Supporting Actions (Black/Gold) */
.btn-secondary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    border: 2px solid var(--secondary-color);
    font-weight: var(--font-medium);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    border-color: var(--accent-gold);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-secondary:active {
    transform: translateY(0);
    transition: all 0.1s ease;
}

/* Enhanced Button Interactions */
.btn:active {
    transform: translateY(0);
    transition: transform 0.1s ease;
}

.btn-large {
    position: relative;
    overflow: hidden;
}

.btn-large::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-large:hover::before {
    left: 100%;
}

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

.btn-small {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* Cards */
.card {
    background-color: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Grid Systems */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

@media (min-width: 768px) {
    .grid {
        gap: var(--space-8);
    }
}

/* Flex Utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

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

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

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

/* Text Utilities */
.text-center {
    text-align: center;
}

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

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

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

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

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

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

/* Spacing Utilities */
.mb-4 {
    margin-bottom: var(--space-4);
}

.mb-6 {
    margin-bottom: var(--space-6);
}

.mb-8 {
    margin-bottom: var(--space-8);
}

.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

.mt-8 {
    margin-top: var(--space-8);
}

/* Visibility */
.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;
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

.animate-slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* Images - Modern Optimization */
img {
    max-width: 100%;
    height: auto;
    display: block;
    /* Modern image optimization */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Images load immediately for better performance */

/* Responsive images */
.img-responsive {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.img-contain {
    object-fit: contain;
}

.img-cover {
    object-fit: cover;
}

/* Image aspect ratios */
.aspect-square {
    aspect-ratio: 1 / 1;
}

.aspect-video {
    aspect-ratio: 16 / 9;
}

.aspect-photo {
    aspect-ratio: 4 / 3;
}

/* Modern CSS Grid and Flexbox Utilities */
.grid {
    display: grid;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

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

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

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* Accessibility Utilities */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}