:root {
    --bts-primary-color: #121214; /* สีม่วงเข้ม */
    --bts-secondary-color: #28292E; /* สีม่วงอ่อน */
    --bts-background-light: #fafbfc; /* พื้นหลังสว่างอมม่วง */
    --bts-text-dark: #3c334d;
    --bts-text-light: #706a7c;
    --bts-card-background: #ffffff;
    --bts-shadow-light: rgba(0, 0, 0, 0.08); /* ลดเงาลง */
    --bts-border-color: #e5e0ed;
}

body {
    background-color: var(--bts-background-light);
    color: var(--bts-text-dark);
    padding-top: 50px; /* เว้นที่ให้ header */
}

main {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Hero Section */
.hero-section {
    width: 100%;
    background: linear-gradient(135deg, var(--bts-primary-color), var(--bts-secondary-color));
    color: white;
    text-align: center;
    padding: 80px 20px;
    margin-bottom: 50px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}

.hero-section h1 {
    font-size: 3.2em;
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: 600;
}

.hero-section p {
    font-size: 1.25em;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
    opacity: 0.9;
}

/* ส่วนเนื้อหาหลัก */
.content-section {
    width: 100%;
    max-width: 1000px;
    padding: 0 20px;
    margin-bottom: 60px;
    box-sizing: border-box;
}

.content-block {
    background-color: var(--bts-card-background);
    border-radius: 15px;
    box-shadow: 0 8px 20px var(--bts-shadow-light);
    padding: 40px;
    margin-bottom: 40px;
    line-height: 1.8;
    font-size: 1.1em;
    color: var(--bts-text-dark);
}

.content-block h2 {
    color: var(--bts-primary-color);
    font-size: 2em;
    margin-top: 0;
    margin-bottom: 25px;
    font-weight: 600;
    text-align: center;
    position: relative;
    padding-bottom: 15px;
}

.content-block h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background-color: var(--bts-secondary-color);
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.content-block h3 {
    color: var(--bts-primary-color);
    font-size: 1.5em;
    margin-top: 30px;
    margin-bottom: 15px;
    font-weight: 600;
    border-left: 5px solid var(--bts-secondary-color);
    padding-left: 15px;
}

.content-block ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 20px;
}

.content-block ul li {
    position: relative;
    padding-left: 30px;
    margin-bottom: 15px;
}

.content-block ul li::before {
    content: "\2022"; /* FontAwesome icon */
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    color: var(--bts-primary-color);
    position: absolute;
    left: 0;
    top: 0px; /* ปรับตำแหน่งไอคอน */
    font-size: 1em;
}

.content-block strong, .bold-star {
    color: var(--bts-primary-color);
    font-weight: 600;
}

/* Call to Action Section */
.cta-section {
    width: 100%;
    max-width: 1000px;
    padding: 50px 20px;
    text-align: center;
    background-color: var(--bts-primary-color);
    color: white;
    border-radius: 15px;
    margin-bottom: 60px;
    box-shadow: 0 10px 30px var(--bts-shadow-light);
    box-sizing: border-box;
}

.cta-section h2 {
    font-size: 2.2em;
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: 600;
}

.cta-section p {
    font-size: 1.15em;
    margin-bottom: 30px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

.cta-buttons a {
    display: inline-block;
    background-color: white;
    color: var(--bts-primary-color);
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1em;
    margin: 10px 15px;
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.cta-buttons a:hover {
    transform: translateY(-3px);
    background-color: #f0f0f0;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section h1 { font-size: 2.5em; }
    .hero-section p { font-size: 1.1em; }
    .content-block { padding: 30px; }
    .content-block h2 { font-size: 1.8em; }
    .content-block h3 { font-size: 1.3em; }
    .cta-section h2 { font-size: 1.8em; }
    .cta-section p { font-size: 1em; }
    .cta-buttons a { padding: 12px 25px; font-size: 1em; }
}

@media (max-width: 576px) {
    .hero-section h1 { font-size: 2em; }
    .content-section, .cta-section { padding: 0 15px; }
    .content-block { padding: 25px; }
    .content-block h2 { font-size: 1.6em; }
    .content-block h3 { font-size: 1.2em; }
    .cta-buttons { display: flex; flex-direction: column; gap: 15px; }
    .cta-buttons a { width: 90%; margin: 0 auto; text-align: center; }

}