/* Variables */
:root {
    --primary-color: #FF4500; /* Vibrant Orange-Red for energy */
    --secondary-color: #1a1a1a; /* Dark Grey */
    --light-bg: #f8f9fa;
    --dark-bg: #121212;
    --text-dark: #333333;
    --text-light: #ffffff;
    --transition-speed: 0.3s;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    background-color: transparent; /* Start transparent */
    padding: 20px 0;
    transition: transform 0.4s ease, background-color 0.3s ease, padding 0.3s ease;
}

.navbar-scrolled {
    background-color: rgba(0, 0, 0, 0.95); /* Dark when scrolled up */
    backdrop-filter: blur(10px);
    padding: 10px 0;
}

.navbar-hidden {
    transform: translateY(-100%); /* Hide on scroll down */
}

.navbar-brand {
    font-size: 1.8rem;
    letter-spacing: -1px;
}

.nav-link {
    font-weight: 500;
    margin: 0 10px;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--primary-color);
    transition: all var(--transition-speed);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transition: all var(--transition-speed);
}

.btn-primary:hover {
    background-color: #e03e00;
    border-color: #e03e00;
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    height: 100vh;
    min-height: 600px;
    background-image: url('https://images.pexels.com/photos/13621289/pexels-photo-13621289.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1'); /* Gym/Trainer Background */
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.4) 100%);
}

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

.animate-up {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0; /* Start hidden */
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

/* Features Section */
.section-features {
    background-color: #fff;
}

.feature-card {
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    background: #fff;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1) !important;
}

.icon-box {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-speed);
}

.feature-card:hover .icon-box {
    transform: scale(1.1) rotate(5deg);
}

/* Programs Section */
.program-card {
    transition: transform var(--transition-speed);
    cursor: pointer;
}

.program-card:hover {
    transform: scale(1.02);
}

.bg-dark-gradient {
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.2) 60%, rgba(0,0,0,0) 100%);
}

.card-img-overlay {
    padding: 2rem;
}

/* Text Utilities */
.text-primary {
    color: var(--primary-color) !important;
}

.bg-primary-subtle { background-color: rgba(255, 69, 0, 0.1) !important; }
.bg-success-subtle { background-color: rgba(25, 135, 84, 0.1) !important; }
.bg-warning-subtle { background-color: rgba(255, 193, 7, 0.1) !important; }
.bg-info-subtle { background-color: rgba(13, 202, 240, 0.1) !important; }

/* Contact Form */
.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(255, 69, 0, 0.25);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .display-3 {
        font-size: 2.5rem;
    }
    
    .hero-section {
        background-attachment: scroll; /* Better mobile performance */
    }
}