/* --- Global Reset and Box Model --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: inherit;
    outline: none;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: all var(--transition-duration, 0.3s) ease;
    will-change: transform, opacity;
    -webkit-tap-highlight-color: transparent; /* Prevent tap highlight on mobile */
}

/* --- Root Variables for Design System --- */
:root {
    --primary-color: #0066cc;
    --primary-light: #3399ff;
    --primary-dark: #003366;
    --secondary-color: #c1c1c1;
    --accent-color: #ff6347;
    --highlight-color: #ff9900;
    --background-color: #f4f4f4;
    --dark-bg-color: #121212;
    --dark-text-color: #f0f0f0;
    --light-shadow: rgba(0, 0, 0, 0.1);
    --dark-shadow: rgba(0, 0, 0, 0.3);
    --card-bg-color: #fff;
    --border-radius: 12px;
    --transition-duration: 0.3s;
    --gutter-spacing: 30px;
    --scroll-bar-width: 12px;
    --max-width: 1200px;
    --header-padding: 20px;
    --section-padding: 80px 20px;
    --form-border-radius: 8px;
    --hover-scale: 1.05;
    --modal-bg-color: rgba(0, 0, 0, 0.5);
    --background-animation-duration: 0.4s;
    --gradient-bg: linear-gradient(135deg, #0066cc, #3399ff);
    --glow-effect: 0 0 15px 2px var(--primary-light);
    --shadow-hover: 0 4px 15px rgba(0, 0, 0, 0.2);
    --hover-blur: blur(5px);
    --font-family: 'Arial', sans-serif;
    --font-family-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --line-height: 1.6;
    --font-size-h1: 3rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 2rem;
    --font-size-h4: 1.8rem;
    --font-size-h5: 1.6rem;
    --font-size-base-mobile: 14px;
    --line-height-mobile: 1.5;
    --fade-in-duration: 1s;
    --slide-up-duration: 1.2s;
    --scroll-animation-duration: 1s;
    --hover-animation-duration: 0.3s;
    --cursor-animation-duration: 0.3s;
    --text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
    --focus-border-color: #ff9900;
    --active-border-color: #0066cc;
    --default-transition: 0.3s ease-out;
    --focus-ring: rgba(255, 153, 0, 0.6); /* Focus outline */
}

/* --- Global Body and Layout --- */
html, body {
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    text-align: left;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    height: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-duration), color var(--transition-duration);
    box-sizing: border-box;
}

/* --- Parallax Effect for Backgrounds --- */
.parallax {
    background: url('https://www.example.com/your-image.jpg') no-repeat fixed;
    background-size: cover;
    min-height: 100vh;
    z-index: -1;
    transition: background-position var(--background-animation-duration) ease-in-out;
}

/* --- Dark Mode Styles --- */
@media (prefers-color-scheme: dark) {
    body {
        background: var(--dark-bg-color);
        color: var(--dark-text-color);
    }

    .section {
        background-color: #333;
        box-shadow: 0 4px 20px var(--dark-shadow);
    }

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

    ::-webkit-scrollbar {
        width: var(--scroll-bar-width);
    }

    ::-webkit-scrollbar-track {
        background: #222;
    }

    ::-webkit-scrollbar-thumb {
        background: var(--primary-light);
        border-radius: 10px;
    }

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

/* --- Scrollbar Customization --- */
::-webkit-scrollbar {
    width: var(--scroll-bar-width);
}

::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 10px;
}

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

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

/* --- Hover Glow Effect on Elements --- */
.card:hover, button:hover, a:hover {
    box-shadow: 0 8px 20px var(--glow-effect);
    transform: translateY(-5px) scale(var(--hover-scale));
    transition: box-shadow var(--default-transition), transform var(--default-transition);
}

/* --- Button Loading Animation --- */
button.loading {
    position: relative;
    pointer-events: none;
}

button.loading::after {
    content: 'Loading...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--primary-light);
    font-size: 14px;
}

/* --- Card Tilt Animation on Mouse Movement --- */
.card {
    transition: transform 0.2s ease;
    transform-origin: center;
    perspective: 1000px;
}

.card:hover {
    transform: rotateY(10deg) rotateX(10deg);
}

.card-inner {
    transition: transform 0.3s ease-in-out;
}

.card:hover .card-inner {
    transform: rotateY(180deg);
}

/* --- Gradient Background Animation --- */
@keyframes gradientShift {
    0% {
        background: linear-gradient(135deg, #0066cc, #3399ff);
    }
    50% {
        background: linear-gradient(135deg, #ff6347, #ff9900);
    }
    100% {
        background: linear-gradient(135deg, #0066cc, #3399ff);
    }
}

.section {
    animation: gradientShift 6s infinite alternate;
}

/* --- Hover Effect with Color Change on Links --- */
a {
    color: var(--primary-color);
    text-decoration: none;
    position: relative;
    transition: color var(--default-transition);
}

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

a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    bottom: 0;
    left: 0;
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.25s ease-out;
}

a:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* --- Tooltip Styling --- */
.tooltip {
    position: relative;
    cursor: pointer;
    display: inline-block;
    z-index: 10;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-dark);
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.875rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s ease-in-out;
    z-index: 20;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(10px);
}

/* --- Bouncing Text Animation --- */
.bouncing-text {
    display: inline-block;
    animation: bounce 1.2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-15px);
    }
}

/* --- Text Sliding-in from the Right --- */
.slide-in-right {
    animation: slideInRight 0.5s ease-out forwards;
}

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

/* --- Slide-up Effect for Sections --- */
@keyframes slideUp {
    0% {
        opacity: 0;
        transform: translateY(50px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.scroll-fade {
    animation: slideUp var(--slide-up-duration) ease-out forwards;
}

/* --- Advanced Responsive Design with Smooth Transitions --- */
@media (max-width: 768px) {
    .section {
        padding: 40px 10px;
        animation: none;
        opacity: 1;
    }

    h1 {
        font-size: var(--font-size-h2);
    }

    .grid-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .card {
        width: 100%;
        height: auto;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: var(--font-size-h3);
    }

    .grid-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .section {
        padding: 20px 10px;
    }
}

/* --- Focus and Accessibility Enhancements --- */
a:focus,
button:focus {
    outline: 3px solid var(--focus-ring);
    box-shadow: 0 0 0 2px var(--focus-ring);
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
    outline: none;
    box-shadow: none;
}

button {
    cursor: pointer;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: var(--form-border-radius);
    transition: background-color var(--default-transition), transform var(--default-transition);
}

button:hover {
    background-color: var(--primary-light);
}

button:active {
    background-color: var(--primary-dark);
    transform: scale(0.95);
}

/* --- Enhanced Loading Spinner for Buttons --- */
button.loading {
    position: relative;
    padding-left: 40px;
}

button.loading::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    border: 3px solid #fff;
    border-top: 3px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* --- Spinner Animation --- */
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* --- Accessibility: Focus Styles --- */
*:focus {
    outline: 3px solid var(--focus-border-color);
    transition: outline-color 0.3s ease-out;
}


/* --- Global Reset and Box Model --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: inherit;
    outline: none;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: all var(--transition-duration, 0.3s) ease;
}

/* --- Root Variables for Design System --- */
:root {
    --primary-color: #0066cc;
    --primary-light: #3399ff;
    --primary-dark: #003366;
    --secondary-color: #c1c1c1;
    --accent-color: #ff6347;
    --highlight-color: #ff9900;
    --background-color: #f4f4f4;
    --dark-bg-color: #121212;
    --dark-text-color: #f0f0f0;
    --light-shadow: rgba(0, 0, 0, 0.1);
    --dark-shadow: rgba(0, 0, 0, 0.3);
    --card-bg-color: #fff;
    --border-radius: 12px;
    --transition-duration: 0.3s;
    --gutter-spacing: 30px;
    --scroll-bar-width: 12px;
    --max-width: 1200px;
    --header-padding: 20px;
    --section-padding: 80px 20px;
    --form-border-radius: 8px;
    --hover-scale: 1.05;
    --modal-bg-color: rgba(0, 0, 0, 0.5);
    --background-animation-duration: 0.4s;

    /* Typography */
    --font-family: 'Arial', sans-serif;
    --font-family-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --line-height: 1.6;
    --font-size-h1: 3rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 2rem;
    --font-size-h4: 1.8rem;
    --font-size-h5: 1.6rem;
    --font-size-base-mobile: 14px;
    --line-height-mobile: 1.5;

    /* Animation & Timing */
    --fade-in-duration: 1s;
    --slide-up-duration: 1.2s;
    --scroll-animation-duration: 1s;
    --hover-animation-duration: 0.3s;
    --cursor-animation-duration: 0.3s;
}

/* --- Global Body and Layout --- */
html, body {
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    text-align: left;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    height: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-duration), color var(--transition-duration);
}

/* --- Dark Mode Styles --- */
@media (prefers-color-scheme: dark) {
    body {
        background: var(--dark-bg-color);
        color: var(--dark-text-color);
    }

    .section {
        background-color: #333;
        box-shadow: 0 4px 20px var(--dark-shadow);
    }

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

    ::-webkit-scrollbar {
        width: var(--scroll-bar-width);
    }

    ::-webkit-scrollbar-track {
        background: #222;
    }

    ::-webkit-scrollbar-thumb {
        background: var(--primary-light);
        border-radius: 10px;
    }

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

/* --- Section Styling --- */
.section {
    padding: var(--section-padding);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--card-bg-color);
    position: relative;
    transition: background-color var(--transition-duration), transform 0.5s ease;
    box-shadow: 0 4px 20px var(--light-shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--gutter-spacing);
    opacity: 0;
    transform: translateY(20px);
    will-change: opacity, transform;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    font-weight: bold;
    transition: transform 0.3s ease, color 0.3s ease;
}

p {
    margin-bottom: 1.5rem;
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    max-width: 85%;
    word-wrap: break-word;
    word-break: break-word;
}

/* --- Hover Effect on Section Titles --- */
h1:hover, h2:hover, h3:hover, h4:hover, h5:hover {
    color: var(--primary-light);
    transform: scale(var(--hover-scale));
    transition: transform 0.3s ease, color 0.3s ease;
}

/* --- Buttons & Links --- */
button, a {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: bold;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: background-color var(--transition-duration), transform var(--transition-duration), box-shadow var(--transition-duration);
    position: relative;
    z-index: 1;
    text-decoration: none;
    overflow: hidden;
}

button:hover, a:hover {
    background-color: var(--primary-light);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    animation: pulse 1s infinite;
}

/* --- Pulsing Animation --- */
@keyframes pulse {
    0% {
        transform: scale(1);
        background-color: var(--primary-light);
    }
    50% {
        transform: scale(1.1);
        background-color: var(--primary-dark);
    }
    100% {
        transform: scale(1);
        background-color: var(--primary-light);
    }
}

/* --- Navigation --- */
nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--header-padding);
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px var(--light-shadow);
    z-index: 1000;
    transition: background-color var(--transition-duration);
    position: sticky;
    top: 0;
    width: 100%;
}

/* --- Sticky Header Effect --- */
nav.sticky {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-bg-color);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1001;
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.modal-content {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    width: 60%;
    padding: 40px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1002;
    transform: scale(0.9);
    opacity: 0;
    transition: transform var(--modal-animation-duration), opacity var(--modal-animation-duration), box-shadow 0.3s ease;
}

.modal-overlay.active .modal-content {
    opacity: 1;
    transform: scale(1);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

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

.tooltip .tooltip-text {
    visibility: hidden;
    width: 120px;
    background-color: var(--primary-color);
    color: #fff;
    text-align: center;
    border-radius: 5px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* --- Image Hover Effects --- */
.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px;
    grid-auto-rows: 250px;
    position: relative;
}

.image-gallery img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--light-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease, filter 0.3s ease;
}

.image-gallery img:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    filter: brightness(1.2);
}

/* --- Clipped Images --- */
.clipped-img {
    clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
    object-fit: cover;
    width: 100%;
    height: 100%;
    transition: transform 0.3s ease;
}

.clipped-img:hover {
    transform: scale(1.05);
}

/* --- Scroll-to-Top Button --- */
.scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 15px;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    box-shadow: 0 6px 20px var(--light-shadow);
    font-size: 1.5rem;
    z-index: 1000;
}

.scroll-to-top:hover {
    background-color: var(--primary-light);
    transform: scale(1.1);
}

.scroll-to-top:active {
    transform: scale(0.95);
}

/* --- Glowing Text Effect --- */
.glowing-text {
    color: var(--primary-color);
    font-size: 2rem;
    font-weight: bold;
    text-shadow: 0 0 10px var(--primary-light), 0 0 20px var(--primary-light), 0 0 30px var(--primary-color);
    animation: glowing 1.5s infinite alternate;
}

@keyframes glowing {
    0% {
        text-shadow: 0 0 5px var(--primary-light), 0 0 10px var(--primary-light), 0 0 15px var(--primary-color);
    }
    100% {
        text-shadow: 0 0 20px var(--primary-light), 0 0 30px var(--primary-light), 0 0 40px var(--primary-color);
    }
}

/* --- Advanced Grid System --- */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--gutter-spacing);
    padding: 20px;
}

@media (max-width: 768px) {
    .glowing-text {
        font-size: 1.5rem;
    }
    .grid-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .slider-text {
        font-size: 1rem;
    }
    .card {
        margin: 10px;
    }
}
/* Global Reset and Box Model */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: inherit;
    outline: none;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: all var(--transition-duration, 0.3s) ease;
}

/* Root Variables for Design System */
:root {
    --primary-color: #0066cc;
    --primary-light: #3399ff;
    --primary-dark: #003366;
    --secondary-color: #c1c1c1;
    --accent-color: #ff6347;
    --highlight-color: #ff9900;
    --background-color: #f4f4f4;
    --dark-bg-color: #121212;
    --dark-text-color: #f0f0f0;
    --light-shadow: rgba(0, 0, 0, 0.1);
    --dark-shadow: rgba(0, 0, 0, 0.3);

    /* Typography */
    --font-family: 'Arial', sans-serif;
    --font-family-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --line-height: 1.6;
    --font-size-h1: 3rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 2rem;
    --font-size-h4: 1.8rem;
    --font-size-h5: 1.6rem;
    --font-size-base-mobile: 14px;
    --line-height-mobile: 1.5;

    /* Layout and Spacing */
    --max-width: 1200px;
    --header-padding: 20px;
    --section-padding: 80px 20px;
    --border-radius: 15px;
    --transition-duration: 0.3s;
    --scroll-bar-width: 12px;
    --card-radius: 10px;
    --gutter-spacing: 30px;

    /* Animations */
    --animation-duration: 0.4s;
    --transition-ease: cubic-bezier(0.68, -0.55, 0.27, 1.55);
    --scroll-animation-duration: 1s;
    --fade-in-duration: 1.2s;
    --slide-up-duration: 1.2s;
    --modal-animation-duration: 0.3s;
}

/* Basic Body Styles */
html, body {
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    text-align: left;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    height: 100%;
}

/* Dark Mode Styles */
@media (prefers-color-scheme: dark) {
    body {
        background: var(--dark-bg-color);
        color: var(--dark-text-color);
    }

    .section {
        background-color: #333;
        box-shadow: 0 4px 20px var(--dark-shadow);
    }

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

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

    .scroll-background {
        background-color: #444;
    }
}

/* Section Styling */
.section {
    padding: var(--section-padding);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--card-bg-color);
    position: relative;
    transition: background-color var(--transition-duration), transform 0.5s ease;
    box-shadow: 0 4px 20px var(--light-shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.section:hover {
    transform: translateY(-10px);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

p {
    margin-bottom: 1.5rem;
    font-size: var(--font-size-base);
    line-height: var(--line-height);
}

/* Typography Enhancements */
h1 {
    font-size: var(--font-size-h1);
}
h2 {
    font-size: var(--font-size-h2);
}
h3 {
    font-size: var(--font-size-h3);
}
h4 {
    font-size: var(--font-size-h4);
}

/* Buttons & Links */
button, a {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: bold;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

button:hover, a:hover {
    background-color: var(--primary-light);
    transform: translateY(-3px);
}

button:focus, a:focus {
    outline: 2px solid var(--accent-color);
}

/* Forms */
input, textarea, select {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--secondary-color);
    outline: none;
    width: 100%;
    box-sizing: border-box;
}

input:focus, textarea:focus, select:focus {
    border-color: var(--primary-color);
}

input::placeholder, textarea::placeholder {
    color: var(--secondary-color);
}

/* Navigation */
nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--header-padding);
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px var(--light-shadow);
    z-index: 1000;
    transition: background-color 0.3s ease;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--primary-light);
}

/* Sticky Header on Scroll */
.sticky-header {
    position: sticky;
    top: 0;
    background-color: var(--primary-color);
    z-index: 9999;
    box-shadow: 0 4px 12px var(--light-shadow);
    transition: background-color var(--transition-duration);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background-color: var(--background-color);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 6px 18px var(--light-shadow);
    width: 60%;
    transition: transform var(--modal-animation-duration) ease;
}

.modal-content.close {
    transform: scale(0.9);
}

/* Grid Layout */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--gutter-spacing);
    padding: 20px;
}

.grid-item {
    background-color: var(--card-bg-color);
    border-radius: var(--card-radius);
    box-shadow: 0 4px 12px var(--light-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.grid-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px var(--light-shadow);
}

/* Parallax Effect */
.parallax {
    background-image: url('path/to/your-image.jpg');
    height: 100vh;
    background-position: center;
    background-attachment: fixed;
    background-size: cover;
    position: relative;
    transition: transform 0.3s ease-in-out;
}

/* Scroll Animation */
@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(50px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp var(--scroll-animation-duration) ease-out forwards;
}

/* Lazy-loaded Images */
.lazy-image {
    opacity: 0;
    transition: opacity 1s ease-out;
}

.lazy-image.loaded {
    opacity: 1;
}

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

.tooltip .tooltip-text {
    visibility: hidden;
    width: 120px;
    background-color: var(--primary-color);
    color: #fff;
    text-align: center;
    border-radius: 5px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: var(--scroll-bar-width);
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
    transition: background 0.3s ease;
}

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

/* Accessibility Improvements */
a:focus, button:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
}

/* Responsive Layout Adjustments */
@media (max-width: 768px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }

    nav {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        flex-direction: column;
    }

    .modal-content {
        width: 90%;
        padding: 20px;
    }

    .section {
        padding: 40px 20px;
    }

    h1 {
        font-size: var(--font-size-h1);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: var(--font-size-base-mobile);
    }
    h2 {
        font-size: var(--font-size-h2);
    }
    .section {
        padding: 20px;
    }
}