:root {
    --primary-color: #043167; /* Oxford Navy */
    --secondary-color: #eaab2b; /* Amber Honey */
    --dark-color: #013474; /* Regal Navy */
    --light-color: #eff7f9; /* Alice Blue */
    --bg-accent: #335376; /* Dusk Blue */
    --white: #ffffff;

    /* Semantic Variables (Light Mode Default) */
    --bg-body: var(--light-color);
    --bg-surface: var(--white);
    --text-main: var(--dark-color);
    --text-muted: var(--bg-accent);
    --icon-color: var(--bg-accent);
    --pattern-color: rgba(4, 49, 103, 0.08); /* Subtle dark pattern */
    --bg-navbar-scrolled: rgba(255, 255, 255, 0.85);
    --navbar-backdrop-filter: blur(10px);
}

html {
    scroll-behavior: smooth;
}
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    transition: background-color 0.3s ease, color 0.3s ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-size: 1.4rem;
    line-height: 1.9;
}
h5 {
    font-size: 1.8rem;
}
.section-padding {
    padding: 6rem 0; /* Reduced padding for a tighter design */
}
.text-container-md {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}
.bg-dark-section {
    background-color: var(--dark-color);
    color: white;
    background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1.5px, transparent 1.5px);
    background-size: 30px 30px;
}
.bg-accent-section {
    background-color: var(--bg-accent);
}
.btn-lang {
    padding: 0.5rem 1rem;
    border-radius: 9999px; /* Rounded pill shape */
    font-weight: 700;
    transition: transform 0.3s ease;
}
.btn-lang:hover {
    transform: scale(1.1);
}
.navbar {
    /* Smooth transition for background color and shadow */
    transition: background-color 0.4s ease, box-shadow 0.4s ease, padding 0.4s ease;
    background-color: transparent;
    padding-top: 1rem;
    padding-bottom: 1rem;
}
/* Style for the navbar when scrolled */
.navbar.scrolled {
    background-color: var(--bg-navbar-scrolled);
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    backdrop-filter: var(--navbar-backdrop-filter);
    -webkit-backdrop-filter: var(--navbar-backdrop-filter);
    /* Override Bootstrap variables for light theme scrolled navbar text */
    --bs-navbar-color: var(--text-main);
    --bs-navbar-hover-color: var(--primary-color);
    --bs-navbar-brand-color: var(--text-main);
    --bs-navbar-brand-hover-color: var(--primary-color);
    --bs-navbar-toggler-icon-bg: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 0, 0, 0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-brand .logo-icon {
    font-size: 1.5rem;
    color: var(--secondary-color);
}
.navbar-brand img {
    max-height: 200px; /* Increased to match hero section */
    max-width: 200px; /* Match hero section width constraint */
    width: auto;
    transition: all 0.3s ease;
}
.navbar.scrolled .navbar-brand img {
    max-height: 60px; /* Shrink logo when scrolled */
}
.nav-link {
    transition: color 0.3s ease;
}
.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link.active {
    color: var(--secondary-color);
}
.navbar-dark .navbar-nav .nav-link.active {
    font-weight: 600; /* Make active link slightly bolder */
}
.card {
    border: none;
    border-radius: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    color: var(--text-main); /* Ensure card text remains dark even in parallax sections */
}
/* Apply a hover effect to all cards, except for the ones in the services section */
.card:not(#services .card):hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}
.card-icon {
    font-size: 3.5rem;
    color: var(--primary-color);
}
/* Removed .text-justify for better readability, browser default (left/start) is better */

/* --- Read More Content Styling --- */
.more-text-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.7s ease-in-out;
    display: inline-block; /* Needed for max-height transition on a span */
}
.more-text-content.expanded {
    max-height: 1000px; /* Large enough to fit the content */
}

.parallax-section {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    color: white;
    padding: 10rem 0;
}

/* Disable parallax on mobile for performance and usability */
@media (max-width: 991.98px) {
    .parallax-section {
        background-attachment: scroll;
    }
    /* Center navigation links and buttons on mobile */
    .navbar-nav {
        text-align: center;
    }
    .navbar-collapse .d-flex {
        justify-content: center;
        margin-top: 1rem;
        margin-bottom: 1rem;
    }
}

#hero {
    background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('./def4.png');
    min-height: 100vh;
}
/* Shift hero content up slightly for optical centering */
#hero .container {
    transform: translateY(-50px);
}
#hero h1 {
    font-family: 'Montserrat', sans-serif;
    text-shadow: 0px 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 2px;
    text-transform: uppercase;
}
#hero img {
    filter: drop-shadow(0 5px 15px rgba(0, 0, 0, 0.3));
}
/* --- Hero Logo Animation --- */
.hero-logo {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1.2s ease-out, transform 1.2s ease-out;
}
.hero-logo.fade-in {
    opacity: 1;
    transform: translateY(0);
}
#vision {
    background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('./2030.png');
}
#values {
    background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('./def5.png');
}
#why-us {
    background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('./def8.png');
}
#services {
    background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('./def3.png');
}
#contact {
    background-image: linear-gradient(rgba(0,0,0,0.9), rgba(0,0,0,0.9)), url('./def2.png');
}

/* Enhanced Typography for Vision, Purpose, and Commitment */
#vision p,
#mission p,
#purpose p,
#our-commitment p,
#why-us p,
#compliance p,
#services p,
#values p {
    font-weight: 700;
    font-size: 1.6rem;
    line-height: 1.6;
}

/* Enhanced Typography for About Us */
#about p {
    font-weight: 600;
    font-size: 1.6rem;
    line-height: 1.8;
}

/* Make section titles stand out on light backgrounds */
.section-padding:not(.bg-dark-section) h1,
.section-padding:not(.bg-dark-section) h2 {
    color: var(--primary-color);
}
.text-primary-accent {
    color: var(--primary-color);
}
/* Ensure list icons in parallax sections are visible (Amber color) */
.parallax-section .list-icon {
    color: var(--secondary-color);
}
.list-icon {
    color: var(--icon-color);
}
.contact-form-card {
    background-color: var(--bg-surface);
}

.form-control {
    background-color: #fff;
    border: 1px solid #ced4da;
}
#contact .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(4, 49, 103, 0.25); /* Updated shadow to Oxford Navy */
}
.form-control {
    border-radius: 0.75rem;
}
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 0.75rem;
    transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}
.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--primary-color); /* Ensure text is readable on Amber background */
    transform: translateY(-2px);
}
.bg-light-section {
    background-color: var(--bg-body);
    background-image: radial-gradient(var(--pattern-color) 1.5px, transparent 1.5px);
    background-size: 30px 30px;
}

/* --- Hero Section Button Customization --- */
#hero .btn-primary {
    background-color: transparent;
    border: 2px solid white;
    color: white;
    font-weight: 700;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

#hero .btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--primary-color); /* Ensure text is readable on Amber background */
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* --- Flip Card Effect for Services --- */
#services .card-container {
    perspective: 1000px; /* 3D space for the flip */
    min-height: 500px; /* Increased height for larger text */
}

#services .card {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
    /* Remove default card hover effect */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

#services .card:hover {
    transform: rotateY(180deg);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1); /* Keep shadow effect on hover */
}

#services .card-front,
#services .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden; /* For Safari */
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
    border-radius: 1.5rem; /* Match the card's border-radius */
}

#services .card-front {
    background-color: var(--bg-surface); /* Card front background */
}

#services .card-back {
    background-color: var(--dark-color); /* Card back background */
    color: white;
    transform: rotateY(180deg);
}

/* --- Scroll Animation --- */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Preloader Spinner --- */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--dark-color);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.aircraft-spinner {
    font-size: 4rem;
    color: var(--secondary-color);
    animation: spin 1.5s linear infinite;
}

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

/* --- Back to Top Button --- */
#back-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1030; /* High z-index to stay on top */
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
}

#back-to-top-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#back-to-top-btn:hover {
    background-color: var(--secondary-color);
    color: white;
}

/* --- Typing Effect Cursor --- */
.typing-cursor::after {
    content: '|';
    display: inline-block;
    margin-left: 5px;
    color: var(--secondary-color);
    animation: blink 0.7s infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* --- Theme-aware Footer --- */
footer.bg-dark-section {
    background-color: var(--bg-body);
    color: var(--text-muted);
    background-image: radial-gradient(var(--pattern-color) 1.5px, transparent 1.5px);
    background-size: 30px 30px;
    margin-top: auto;
}

/* --- Theme-aware Navbar Buttons --- */
.navbar.scrolled .btn-lang {
    color: var(--text-main);
    border-color: var(--text-muted);
}

/* --- Animation Delays --- */
.delay-200 {
    transition-delay: 0.2s;
}

/* --- Certificate Images --- */
.cert-img {
    transition: transform 0.3s ease;
    max-height: 250px; /* Limit height to keep layout clean */
    cursor: pointer;
}
.cert-img:hover {
    transform: scale(1.05);
}

/* --- Certificate Cards --- */
.cert-card-trigger {
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.cert-card-trigger:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

/* --- Lightbox Styles --- */
.lightbox-modal {
    display: none;
    position: fixed;
    z-index: 2000; /* Higher than navbar */
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
}

.lightbox-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 900px;
    max-height: 80vh;
    object-fit: contain;
    animation: zoom 0.6s;
}

@keyframes zoom {
    from {transform:scale(0)}
    to {transform:scale(1)}
}

.close-lightbox {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.close-lightbox:hover,
.close-lightbox:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}