:root {
    --brand-primary: #0066cc;
    --brand-secondary: #00a8e8;
    --brand-accent: #ff6b35;
    --brand-dark: #1a1a2e;
    --brand-light: #f8f9fa;
    --transition-speed: 0.3s;
}

* {
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 0;
    margin: 0;
    line-height: 1.6;
    color: var(--brand-dark);
}

/* Sticky Navigation */
#sticky-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    padding: 15px 0;
    transform: translateY(-100%);
    transition: transform 0.3s ease-in-out;
}

#sticky-nav.visible {
    transform: translateY(0);
}

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

#sticky-nav .nav-brand {
    font-weight: 700;
    color: var(--brand-primary);
    font-size: 1.2rem;
}

#sticky-nav .nav-links a {
    color: var(--brand-dark);
    text-decoration: none;
    margin: 0 15px;
    transition: color var(--transition-speed);
    font-weight: 500;
}

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

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--brand-primary);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-speed);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background: var(--brand-secondary);
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.6);
}

/* Main Content Container */
.main-content {
    padding: 20px;
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 60px;
    padding-top: 40px;
    animation: fadeInDown 0.8s ease-out;
}

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

h1 {
    font-size: clamp(2rem, 5vw, 2.8rem);
    color: var(--brand-dark);
    font-weight: 700;
    margin-bottom: 15px;
}

.brand-tagline {
    font-size: clamp(1.1rem, 3vw, 1.4rem);
    color: var(--brand-primary);
    font-weight: 600;
    margin: 20px 0;
}

/* Section Styling */
section {
    margin-bottom: 80px;
    animation: fadeInUp 0.6s ease-out;
}

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

.section-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin: 40px 0 30px;
    font-weight: 700;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    border-radius: 2px;
}

/* Card Improvements */
.card {
    transition: all var(--transition-speed);
    border: 1px solid rgba(0,0,0,0.08);
    height: 100%;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
    border-color: var(--brand-primary);
}

.card img {
    height: 120px;
    object-fit: contain;
    padding: 15px;
    transition: transform var(--transition-speed);
}

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

.sg-gov-section {
    background: linear-gradient(145deg, rgba(0, 102, 204, 0.12), rgba(0, 168, 232, 0.08));
    border-radius: 28px;
    padding: 60px 30px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.1);
}

.sg-gov-logos {
    margin-top: 30px;
}

.sg-gov-logos .agency-card {
    border: none;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.sg-gov-logos .agency-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 44px rgba(0, 102, 204, 0.18);
}

.sg-gov-logos .agency-card .card-img-top {
    padding: 24px 36px;
    height: 120px;
    object-fit: contain;
}

.sg-gov-logos .agency-card .agency-subtext {
    margin-top: 6px;
    color: rgba(26, 26, 46, 0.65);
    font-size: 0.85rem;
}

.card-body {
    padding: 1.5rem;
}

.locked-engagement {
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.locked-engagement:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 44px rgba(0, 102, 204, 0.18);
}

.locked-engagement .card-title {
    color: var(--brand-dark);
}


.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--brand-dark);
    margin-bottom: 10px;
}

/* CTA Button Styles */
.cta-button {
    display: inline-block;
    padding: 15px 35px;
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all var(--transition-speed);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(0, 102, 204, 0.5);
    color: white;
}

.cta-section {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    color: white;
    padding: 60px 20px;
    border-radius: 20px;
    text-align: center;
    margin: 60px 0;
}

/* Improved Responsiveness */
@media (max-width: 992px) {
    .sg-gov-logos .agency-card .card-img-top {
        height: 110px;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 10px;
    }

    #sticky-nav .nav-links {
        display: none;
    }

    #back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    section {
        margin-bottom: 50px;
    }

    .sg-gov-section {
        padding: 40px 20px;
        border-radius: 20px;
    }

    .sg-gov-logos .agency-card .card-img-top {
        padding: 20px 24px;
        height: 90px;
    }
}


/* Accessibility: Focus States */
a:focus, button:focus {
    outline: 3px solid var(--brand-accent);
    outline-offset: 2px;
}

/* Loading Animation for Images */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.5s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Footer Improvements */
footer {
    text-align: center;
    margin-top: 60px;
    color: #6c757d;
}

/* Carousel controls styling */
.carousel-control-prev-icon,
.carousel-control-next-icon {
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    padding: 20px;
}

.carousel-control-prev,
.carousel-control-next {
    opacity: 0.8;
    transition: opacity var(--transition-speed);
}

.carousel-control-prev:hover,
.carousel-control-next:hover {
    opacity: 1;
}

.carousel-indicators button {
    background-color: #333;
}

.carousel-indicators button.active {
    background-color: var(--brand-primary);
}

/* Badge Improvements */
.badge {
    font-weight: 500;
    padding: 6px 12px;
    font-size: 0.85rem;
}

/* Content Readability */
p.lead {
    font-size: 1.15rem;
    line-height: 1.7;
}

.text-muted {
    line-height: 1.6;
}

/* Certificate Modal Z-index Fix */
#certificateModal {
    z-index: 1060 !important;
}

.modal-backdrop.show {
    z-index: 1050 !important;
}