* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Prompt', sans-serif;
}

body {
    line-height: 1.6;
    color: #333;
    /* สีพื้นหลังหลัก สีเขียวอ่อนแบบเดียวกันทั้งหมด */
    background-color: #f4f7f6; 
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
}

header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 24px;
    color: #007a53;
    font-weight: 700;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    transition: 0.3s;
    font-weight: 500;
}

.nav-links a:hover {
    color: #007a53;
}

.btn-primary {
    background-color: #007a53;
    color: white !important;
    padding: 8px 20px;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}

.btn-large {
    display: inline-block;
    background-color: #cc292b;
    color: white;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}

.hero {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.7) 20%, rgba(0, 0, 0, 0.1) 80%), 
                url('spd.jpg') no-repeat right center;
    background-size: contain; 
    background-color: #d5cfcd; 
    height: 100vh;
    display: flex;
    align-items: center;
    text-align: left; 
    color: white;
    padding-top: 80px;
}

.hero-content {
    margin-left: 5%; 
    margin-top: 80px;
}

.hero-content h2 { 
    font-size: 3.2rem; 
    margin-bottom: 20px; 
    font-weight: 700; 
    text-shadow: 2px 2px 10px rgba(0,0,0,0.5); 
    max-width: 900px;
}
.hero-content p { 
    font-size: 1.2rem; 
    margin-bottom: 30px; 
    max-width: 600px;
    text-shadow: 1px 1px 5px rgba(0,0,0,0.5);
}

.hero-checklist {
    list-style: none;
    margin-top: 40px;
    font-size: 1.3rem;
    font-weight: 600;
    text-shadow: 1px 1px 5px rgba(0,0,0,0.5);
}
.hero-checklist li {
    margin-bottom: 12px;
    color: #fff;
    display: flex;
    align-items: center;
}

section { padding: 80px 0; }

/* =========================================
   ดีไซน์หัวข้อ (Section Title) แบบ "มินิมอล"
========================================= */
.section-title { 
    text-align: center; 
    font-size: 2.2rem; 
    margin-bottom: 60px; 
    color: #2c3e50; /* สีเทาเข้มอมน้ำเงิน ดูเรียบหรู */
    font-weight: 600; 
    position: relative;
    padding-bottom: 15px; /* เว้นที่ให้เส้นด้านล่าง */
    letter-spacing: 0.5px;
}

/* เส้นประดับด้านล่างแบบเรียบง่าย */
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px; /* เส้นสั้นๆ ดูมินิมอล */
    height: 3px;
    background-color: #007a53; /* สีหลักแบรนด์ */
    border-radius: 3px;
    transition: width 0.3s ease, background-color 0.3s ease;
}

/* แอคชั่นตอนเอาเมาส์ชี้ ยืดออกเล็กน้อยพอมีลูกเล่น */
.section-title:hover::after {
    width: 100px;
    background-color: #cc292b; /* เปลี่ยนเป็นสีแดงแบรนด์ */
}
/* ========================================= */

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.package-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.04);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #f0f0f0;
}

.package-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,122,83,0.1);
}

.pkg-header {
    background-color: #007a53;
    color: white;
    padding: 20px;
    text-align: center;
    display: flex;
    flex-direction: column;
}

.pkg-header h3 {
    font-size: 2.5rem;
    margin: 0;
}

.pkg-header .phase {
    background: rgba(255,255,255,0.2);
    padding: 2px 10px;
    border-radius: 15px;
    font-size: 0.9rem;
    display: inline-block;
    margin-top: 5px;
    align-self: center;
}

.pkg-details {
    list-style: none;
    padding: 25px;
    font-size: 0.95rem;
}

.pkg-details li {
    margin-bottom: 12px;
    color: #555;
}

.save-cost {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed #ccc;
    color: #007a53 !important;
    font-weight: 600;
}

.price {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: #cc292b;
    padding: 0 20px 25px 20px;
}

.price span {
    font-size: 1.2rem;
    color: #777;
    font-weight: 400;
}

.calculator { background-color: transparent; }
.calc-box {
    background: #ffffff; 
    padding: 40px;
    border-radius: 15px;
    max-width: 600px;
    margin: auto;
    box-shadow: 0 5px 20px rgba(0,0,0,0.03);
    border: 1px solid #f0f0f0;
    text-align: center;
}
.calc-input {
    width: 100%;
    padding: 15px;
    margin: 20px 0;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1.2rem;
    text-align: center;
    transition: border-color 0.3s;
}
.calc-input:focus {
    border-color: #007a53;
    outline: none;
}
.calc-result {
    margin-top: 25px;
    padding: 20px;
    background: #f8faf9;
    border-radius: 8px;
    color: #333;
    text-align: left;
    border: 1px solid #e2ece8;
}
.calc-result h3 { color: #007a53; margin-bottom: 15px; text-align: center; }

.why-us { background-color: transparent; }
.features-list { list-style: none; max-width: 900px; margin: auto; }
.features-list li { background: #fff; margin-bottom: 15px; padding: 20px; border-radius: 8px; font-size: 1.05rem; box-shadow: 0 2px 10px rgba(0,0,0,0.02); border: 1px solid #f0f0f0;}

.contact { background-color: transparent; }
.text-center { text-align: center; width: 100%; }
.contact-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 20px;
}
.btn-line {
    background-color: #00B900;
    color: white;
    padding: 12px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    transition: 0.3s;
    box-shadow: 0 4px 10px rgba(0, 185, 0, 0.2);
}
.btn-line:hover { background-color: #009900; transform: translateY(-3px); }

.btn-phone {
    background-color: #cc292b; 
    color: white;
    padding: 12px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    transition: 0.3s;
    box-shadow: 0 4px 10px rgba(204, 41, 43, 0.2);
}
.btn-phone:hover { background-color: #a82022; transform: translateY(-3px); }

footer { background: #00321e; color: white; text-align: center; padding: 40px 0; }
.footer-content p { margin-bottom: 8px; color: #d1dfd9; font-weight: 300; }
.footer-content h3 { margin-bottom: 15px; color: #fff; font-weight: 500; }

/* =========================================
   ส่วนแสดงผลงานที่ติดตั้ง (Stats Section) 
========================================= */
.stats-section {
    background-color: transparent; 
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.stat-card {
    background: #ffffff; 
    padding: 40px 20px;
    border-radius: 15px;
    border: 1px solid #f0f0f0;
    box-shadow: 0 5px 20px rgba(0,0,0,0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,122,83,0.08);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.9;
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 5px;
    line-height: 1;
    color: #007a53; 
}

.stat-label {
    font-size: 1.1rem;
    font-weight: 500;
    color: #555;
    letter-spacing: 0.5px;
}