:root {
    --primary-yellow: #FFC107;
    --dark-yellow: #D4A000;
    --black: #0B0B0B;
    --dark-gray: #1A1A1A;
    --medium-gray: #2C2C2C;
    --light-gray: #E0E0E0;
    --white: #FFFFFF;
}

body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--black);
    color: var(--light-gray);
    line-height: 1.6;
}

/* General Structure & Typography */
section {
    padding: 80px 5%;
}

.bg-gray {
    background-color: var(--dark-gray);
}

.section-title {
    color: var(--primary-yellow);
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 50px;
    text-transform: uppercase;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background-color: var(--white);
    margin: 15px auto 0;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary-yellow);
    color: var(--black);
    padding: 15px 35px;
    font-size: 1.1rem;
    font-weight: 900;
    text-decoration: none;
    text-transform: uppercase;
    border-radius: 3px;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 4px 10px rgba(255, 193, 7, 0.2);
}

.btn:hover {
    background-color: var(--dark-yellow);
    transform: translateY(-2px);
}

.btn-wrapper {
    text-align: center; 
    margin-top: 50px;
}

/* Navigation & Header */
header {
    background-color: var(--black);
    border-bottom: 4px solid var(--primary-yellow);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--primary-yellow);
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
}

.logo span {
    color: var(--white);
}

nav a {
    color: var(--white);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(rgba(11, 11, 11, 0.85), rgba(11, 11, 11, 0.95)), repeating-linear-gradient(
        45deg,
        #1a1a1a,
        #1a1a1a 20px,
        #222 20px,
        #222 40px
    );
    text-align: center;
    padding: 60px 20px;
    border-bottom: 5px dashed var(--primary-yellow);
}

.hero h1 {
    color: var(--primary-yellow);
    font-size: 3.5rem;
    margin: 0 0 15px 0;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero p {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto 35px auto;
    color: var(--white);
}

/* Guide & Numbered Steps Section */
#Guide .step-list li {
    background-color: var(--dark-gray);
    margin-bottom: 15px; 
    padding: 20px 20px 20px 75px; /* Left padding for number */
    border-radius: 4px;
    position: relative;
    border: 1px solid var(--medium-gray);
}

#Guide .step-number {
    position: absolute;
    left: 20px;
    top: 20px;
    background-color: var(--primary-yellow);
    color: var(--black);
    width: 35px; /* Adjusted for better text fit */
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    border-radius: 50%;
}

#Guide .step-list h3 {
    margin: 0 0 10px 0;
    color: var(--primary-yellow);
    font-size: 1.3rem;
}

#Guide .step-list p {
    margin: 0;
    color: var(--light-gray);
}

/* Certifications Section */
.about-container {
    max-width: 900px; 
    margin: 0 auto;
}

.instructor-intro {
    text-align: center; 
    margin-bottom: 50px;
}

.instructor-intro p {
    font-size: 1.1rem; 
    color: var(--light-gray);
}

.cert-heading {
    color: var(--primary-yellow); 
    font-size: 1.8rem; 
    text-align: center; 
    margin-bottom: 30px; 
    text-transform: uppercase;
}

.step-list {
    list-style: none;
    padding: 0;
    max-width: 800px;
    margin: 0 auto;
}

.cert-item {
    background-color: var(--dark-gray);
    margin-bottom: 10px;
    padding: 15px 25px; /* Adjusted padding since step-numbers are gone */
    border-radius: 4px;
    border: 1px solid var(--medium-gray);
}

.cert-item details summary {
    cursor: pointer; 
    outline: none; 
    font-size: 1.17em; 
    font-weight: bold; 
    color: var(--primary-yellow); 
}

.cert-item details[open] summary {
    margin-bottom: 10px; /* Space below when expanded */
}

.cert-item details ul {
    margin-top: 10px; 
    color: var(--light-gray); 
    font-size: 0.95rem; 
    line-height: 1.6; 
    padding-left: 25px; 
    list-style-type: disc; /* Standard bullet points */
}

.cert-item details ul ul {
    list-style-type: circle; /* Hollow circle sub-bullets */
    margin-top: 5px; 
    margin-bottom: 5px;
}

.cert-item details p {
    margin-bottom: 5px; 
    color: var(--light-gray);
}

/* Grids & Cards */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background-color: var(--dark-gray);
    padding: 35px;
    border-top: 5px solid var(--primary-yellow);
    border-radius: 4px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.5);
}

.card h3 {
    color: var(--white);
    font-size: 1.5rem;
    margin-top: 0;
    text-transform: uppercase;
}

/* Testimonials */
.testimonial {
    background-color: var(--black);
    border-left: 4px solid var(--primary-yellow);
    padding: 25px;
    font-style: italic;
}

.testimonial span {
    display: block;
    margin-top: 15px;
    font-weight: bold;
    color: var(--primary-yellow);
    font-style: normal;
    text-transform: uppercase;
    font-size: 0.9rem;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 15px;
    background-color: var(--medium-gray);
    border: 1px solid var(--dark-gray);
    color: var(--white);
    border-radius: 4px;
    font-family: inherit;
    box-sizing: border-box;
}

.contact-form input:focus, .contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-yellow);
}

/* Footer */
footer {
    background-color: #000;
    text-align: center;
    padding: 40px 20px;
    border-top: 4px solid var(--primary-yellow);
    font-size: 0.9rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 15px;
    }
    nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    nav a { margin: 0; }
    .hero h1 { font-size: 2.2rem; }
}