:root {
    /* Colors */
    --color-primary-dark: #2c3e50; /* Dark blue/charcoal */
    --color-primary-light: #34495e; /* Slightly lighter blue/charcoal */
    --color-accent-teal: #00c4b4; /* Vibrant teal */
    --color-accent-gold: #ffcc00; /* Warm gold for highlights */
    --color-text-light: #ecf0f1; /* Light gray for body text on dark backgrounds */
    --color-text-dark: #34495e; /* Dark text for light backgrounds */
    --color-background-light: #f4f7f6; /* Off-white for sections */
    --color-background-dark: #263238; /* Dark background for hero/footer */
    --color-gradient-start: #2c3e50;
    --color-gradient-end: #1a2a3a; /* Darker blue */

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;

    /* Border Radius */
    --border-radius-sm: 5px;
    --border-radius-md: 10px;
    --border-radius-lg: 15px;

    /* Shadows */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 15px 35px rgba(0, 0, 0, 0.18);

    /* Transitions */
    --transition-ease: all 0.3s ease-in-out;
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text-dark);
    line-height: 1.6;
    background-color: var(--color-background-light);
}

a {
    text-decoration: none;
    color: var(--color-accent-teal);
    transition: var(--transition-ease);
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

h1 { font-size: 3.5rem; font-weight: 700; }
h2 { font-size: 2.8rem; font-weight: 600; }
h3 { font-size: 2rem; font-weight: 500; }
p { margin-bottom: var(--spacing-md); }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xxl) 0;
    position: relative;
    overflow: hidden;
}

.section-title {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-dark);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent-teal), var(--color-accent-gold));
    border-radius: var(--border-radius-sm);
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Header */
.header {
    background-color: rgba(44, 62, 80, 0.95); /* Semi-transparent dark blue */
    padding: var(--spacing-md) 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease-in-out;
}

.header.scrolled {
    background-color: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--color-accent-teal);
    letter-spacing: -0.5px;
}

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

.nav-menu a {
    color: var(--color-text-light);
    font-weight: 500;
    margin-left: var(--spacing-lg);
    padding: var(--spacing-xs) var(--spacing-sm);
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-accent-teal);
    transform: translateX(-100%);
    transition: transform 0.3s ease-out;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    transform: translateX(0);
}

.nav-menu a:hover {
    color: var(--color-accent-gold);
}

/* Hamburger Menu (Mobile) */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    z-index: 1001; /* Above nav-menu when active */
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background-color: var(--color-text-light);
    margin: 4px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Hero Section */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-text-light);
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 100%);
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('images/image_13.jpg'); /* Large background image */
    background-size: cover;
    background-position: center;
    opacity: 1;.15; /* Subtle image in background */
    filter: grayscale(100%);
    z-index: 1;
    transform: translateZ(0); /* Fix for potential Safari issues */
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    padding: var(--spacing-xl);
    animation: fadeInScale 1s ease-out forwards;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.hero-content h1 {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5), 0 2px 10px rgba(0, 0, 0, 0.3);
    line-height: 1.1;
}

.hero-content p {
    font-size: 1.5rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    font-weight: 500;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--color-accent-teal);
    font-size: 1rem;
    font-weight: 500;
    opacity: 1;.8;
    animation: bounce 2s infinite;
    cursor: pointer;
    z-index: 3;
}

.hero-scroll-indicator i {
    font-size: 1.5rem;
    margin-top: var(--spacing-xs);
}

@keyframes fadeInScale {
    from {
        opacity: 1;
        transform: scale(0.95) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* About Section */
.about-section {
    background-color: var(--color-background-light);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-image-wrapper {
    position: relative;
    padding: var(--spacing-md);
    animation-delay: 0.2s;
}

.about-img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.image-decor {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 5px solid var(--color-accent-teal);
    top: var(--spacing-md);
    left: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    transform: translate(var(--spacing-md), var(--spacing-md));
    z-index: 1;
}

.about-content h2 {
    font-size: 2.5rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    color: var(--color-primary-light);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

/* Courses Section */
.courses-section {
    background-color: #fcfcfc;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.course-card {
    background-color: #ffffff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition-ease);
    animation-delay: 0.3s;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
}

.course-card .card-image-wrapper {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.course-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease-out;
}

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

.course-card .card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(44, 62, 80, 0.7) 0%, rgba(44, 62, 80, 0.1) 100%);
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

.course-card h3 {
    padding: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-xs);
}

.course-card p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-primary-light);
    font-size: 1rem;
    margin-bottom: 0;
}

.course-card .course-features {
    list-style: none;
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-primary-light);
    font-size: 0.9rem;
}

.course-card .course-features li {
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
}

.course-card .course-features li i {
    margin-right: var(--spacing-xs);
    color: var(--color-accent-teal);
    font-size: 1rem;
}

/* Instructors Section */
.instructors-section {
    background-color: var(--color-background-light);
}

.instructor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.instructor-card {
    background-color: #ffffff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition-ease);
    animation-delay: 0.4s;
}

.instructor-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-accent-teal);
}

.instructor-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: var(--spacing-md);
    border: 4px solid var(--color-accent-teal);
    transition: border-color 0.3s ease;
}

.instructor-card:hover .instructor-img {
    border-color: var(--color-accent-gold);
}

.instructor-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary-dark);
}

.instructor-card .instructor-title {
    color: var(--color-accent-teal);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.instructor-card p {
    font-size: 0.95rem;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-md);
}

.instructor-card .social-icons a {
    color: var(--color-primary-light);
    font-size: 1.2rem;
    margin: 0 var(--spacing-xs);
    transition: var(--transition-ease);
}

.instructor-card .social-icons a:hover {
    color: var(--color-accent-teal);
    transform: scale(1.1);
}

/* Why Us Section */
.why-us-section {
    background-color: #fcfcfc;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-item {
    background-color: #ffffff;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition-ease);
    animation-delay: 0.5s;
    border-left: 5px solid transparent;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--color-accent-teal);
}

.feature-icon {
    font-size: 3rem;
    color: var(--color-accent-teal);
    margin-bottom: var(--spacing-md);
    display: block;
    transition: var(--transition-ease);
}

.feature-item:hover .feature-icon {
    color: var(--color-accent-gold);
}

.feature-item h3 {
    font-size: 1.5rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    color: var(--color-primary-light);
    font-size: 1rem;
    margin-bottom: 0;
}

/* Testimonial Section */
.testimonial-section {
    background: linear-gradient(135deg, var(--color-gradient-end) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-light);
}

.testimonial-section .section-title {
    color: var(--color-text-light);
}
.testimonial-section .section-title::after {
    background: linear-gradient(90deg, var(--color-text-light), var(--color-accent-gold));
}

.testimonial-carousel {
    position: relative;
    max-width: 900px;
    margin: var(--spacing-xl) auto;
    overflow: hidden;
    text-align: center;
}

.testimonial-card {
    background-color: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(5px);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    display: none;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--shadow-md);
    animation-delay: 0.6s;
}

.testimonial-card.active {
    display: flex;
    animation: fadeIn 0.8s ease-out forwards;
}

.testimonial-img {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: var(--spacing-md);
    border: 3px solid var(--color-accent-teal);
}

.testimonial-card blockquote {
    font-size: 1.3rem;
    font-style: italic;
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    line-height: 1.5;
    color: var(--color-text-light);
}

.testimonial-author {
    font-weight: 600;
    color: var(--color-accent-gold);
    font-size: 1.1rem;
}

.carousel-nav {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.carousel-nav .dot {
    width: 12px;
    height: 12px;
    background-color: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    margin: 0 var(--spacing-sm);
    cursor: pointer;
    transition: var(--transition-ease);
}

.carousel-nav .dot.active {
    background-color: var(--color-accent-teal);
    transform: scale(1.2);
}

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

/* Footer */
.footer {
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
    padding: var(--spacing-xxl) 0 var(--spacing-md);
    font-size: 0.95rem;
}

.footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--color-accent-gold);
    margin-bottom: var(--spacing-md);
    display: block;
}

.footer-col p {
    color: rgba(236, 240, 241, 0.8);
    margin-bottom: var(--spacing-lg);
}

.footer-col h3 {
    color: var(--color-text-light);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-col ul li a {
    color: rgba(236, 240, 241, 0.8);
}

.footer-col ul li a:hover {
    color: var(--color-accent-teal);
    padding-left: 5px;
}

.footer .social-links a {
    color: var(--color-text-light);
    font-size: 1.2rem;
    margin-right: var(--spacing-md);
    transition: var(--transition-ease);
}

.footer .social-links a:hover {
    color: var(--color-accent-gold);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(236, 240, 241, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-bottom p {
    margin: 0;
    color: rgba(236, 240, 241, 0.7);
}

.footer-links-bottom a {
    color: rgba(236, 240, 241, 0.7);
    margin-left: var(--spacing-md);
}

.footer-links-bottom a:hover {
    color: var(--color-accent-teal);
}

/* Reveal on Scroll (JavaScript controlled) */
.reveal-on-scroll {
    opacity: 1;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 992px) {
    h1 { font-size: 3.5rem; }
    h2 { font-size: 2.2rem; }
    h3 { font-size: 1.7rem; }
    .hero-content p { font-size: 1.3rem; }

    .about-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .about-image-wrapper {
        order: -1; /* Image appears before text on mobile */
        margin-bottom: var(--spacing-lg);
    }
    .image-decor {
        top: 0;
        left: 0;
        transform: translate(var(--spacing-md), var(--spacing-md));
    }
    .course-card, .instructor-card, .feature-item {
        margin-bottom: var(--spacing-lg);
    }
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    .footer-links-bottom a {
        margin: 0 var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        background-color: var(--color-primary-dark);
        width: 100%;
        flex-direction: column;
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        box-shadow: var(--shadow-md);
        padding: var(--spacing-md) 0;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-menu a {
        margin: var(--spacing-sm) 0;
        padding: var(--spacing-md) var(--spacing-lg);
        display: block;
        text-align: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu a:last-child {
        border-bottom: none;
    }

    .header.scrolled .nav-menu {
        background-color: var(--color-primary-dark);
    }

    h1 { font-size: 2.8rem; }
    h2 { font-size: 2rem; }
    .hero-content p { font-size: 1.1rem; }
    
    .hero-content {
        border-radius: 15px;
        backdrop-filter: blur(8px);
        padding: var(--spacing-lg);
    }
    .section-title { font-size: 2rem; }
    .section-subtitle { font-size: 1rem; }
    .about-img { height: 300px; }

    .course-grid, .instructor-grid, .features-grid {
        grid-template-columns: 1fr;
    }
    .testimonial-card {
        padding: var(--spacing-lg);
    }
    .testimonial-card blockquote {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.4rem; }
    .hero-content p { font-size: 1rem; }
    .section-title { font-size: 1.8rem; }
    .section-subtitle { font-size: 0.9rem; }

    .about-content h2 { font-size: 2rem; }
    .about-content p { font-size: 1rem; }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-col ul {
        padding-inline-start: 0;
    }
    .footer-col .social-links {
        margin-top: var(--spacing-md);
    }
}
/* Visible state helpers */
+ .animate-fade-in-up.visible,
+ .animate-fade-in-left.visible,
+ .animate-fade-in-right.visible,
+ .animate-bounce-y.visible,
+ .section-scroll-animate.visible,
+ .text-animate-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Safe visibility overrides (auto-added) */
:root, html, body, main, header, footer, section, .container, .content {
  opacity: 1 !important;
  visibility: visible !important;
}