/* --- Root Variables (Color Palette) --- */
:root {
    --very-dark-green: #4A6B29;
    --dark-green: #5D8736;
    --medium-green: #809D3C;
    --light-green: #A9C46C;
    --pale-green: #EEEFE0;
    --white-text: #ffffff;
    --dark-text: #333333;
}

/* --- Global Styles --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Prompt', sans-serif; 
    background-color: var(--pale-green);
    color: var(--dark-text);
    line-height: 1.6;
}

/* --- Navbar (Desktop View) --- */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--very-dark-green);
    color: var(--white-text);
    padding: 0.8rem 2rem;
    height: 70px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--white-text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    margin-right: 10px;
}

.logo-text {
    display: flex;
    align-items: center;
    gap: 8px;
    line-height: 1.2;
}

.logo-sub {
    font-weight: 400;
    opacity: 0.9;
}

.logo-sub::before {
    content: "|";
    margin-right: 8px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--white-text);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--light-green);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--pale-green);
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--white-text);
    transition: all 0.3s ease-in-out;
}

/* --- Hero Section --- */
.hero-section {
    height: 100vh; 
    background-color: var(--dark-green); 
    color: var(--white-text);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 2rem;
}

.hero-content h1 {
    font-size: 3.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.3rem;
    font-weight: 300;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
    margin-bottom: 2rem; /* แก้ไข: เพิ่มระยะห่างด้านล่างของย่อหน้านี้ */
}

.hero-section .btn-primary {
    background-color: var(--white-text);
    color: var(--dark-green);
    border: none;
    border-radius: 50px;
    padding: 15px 40px;
    font-size: 1.1rem;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin-top: 1.5rem; /* แก้ไข: ปรับระยะห่างด้านบนให้สมดุล */
}

.hero-section .btn-primary:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

/* --- General Buttons (for other sections) --- */
.btn-secondary {
    background-color: var(--medium-green);
    color: var(--white-text);
    display: inline-block;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

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

/* --- Tools Section --- */
.tools-section {
    padding: 4rem 2rem;
    text-align: center;
}

.tools-section h2 {
    font-size: 2.5rem;
    color: var(--dark-green);
    margin-bottom: 3rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background-color: #fff;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    border-bottom: 5px solid var(--light-green);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-bottom-color: var(--dark-green);
}

.card-icon {
    font-size: 3rem;
    color: var(--medium-green);
    margin-bottom: 1rem;
}

.card h3 {
    font-size: 1.4rem;
    color: var(--dark-green);
    margin-bottom: 0.5rem;
}

.card p {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* --- Footer --- */
footer {
    background-color: var(--dark-green);
    color: var(--white-text);
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
}

.footer-contact {
    margin: 1rem 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-contact span {
    margin: 0;
}

.footer-contact i {
    margin-right: 8px;
    color: var(--light-green);
}

.copyright {
    font-size: 0.9rem;
    margin-top: 1rem;
    opacity: 0.8;
}

/* --- Overlay for Mobile Menu --- */
#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

#overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ========================================================== */
/* === Responsive for Tablets & Mobiles (max-width: 768px) === */
/* ========================================================== */
@media (max-width: 768px) {
    /* --- Hamburger Menu --- */
    .hamburger {
        display: block;
        z-index: 1001;
    }
    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    
    /* --- Logo on Mobile --- */
    .logo-text {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
    }
    .logo-sub::before {
        content: "";
        margin: 0;
    }
    .logo-main { font-size: 0.9rem; }
    .logo-sub { font-size: 0.8rem; }
    
    /* --- Mobile Navigation Menu (Side Drawer) --- */
    .nav-menu {
        position: fixed;
        right: -100%;
        top: 0;
        flex-direction: column;
        justify-content: flex-start;
        align-items: flex-start;
        gap: 0;
        width: 280px;
        height: 100vh;
        padding-top: 90px;
        background-color: var(--dark-green);
        box-shadow: -5px 0 15px rgba(0,0,0,0.2);
        transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
        z-index: 999;
    }
    .nav-menu.active { right: 0; }
    .nav-item { width: 100%; }
    .nav-link {
        display: block;
        width: 100%;
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
    .nav-link:hover::after { width: 0; }
    .nav-link:active { background-color: var(--medium-green); }

    /* === Hero Section on Mobile (นี่คือส่วนที่แก้ไข) === */
    .hero-section {
        padding-bottom: 15vh;
    }
    
    .hero-section h1 {
        font-size: 2.5rem; 
        line-height: 1.2;
    }
    
    .hero-content p {
        font-size: 1rem;
        margin-bottom: 1.5rem; /* แก้ไข: เพิ่มระยะห่างด้านล่างสำหรับมือถือ */
    }

    .hero-section .btn-primary {
        padding: 12px 30px; 
        font-size: 1rem;
        margin-top: 1rem; /* แก้ไข: ปรับระยะห่างด้านบนสำหรับมือถือ */
    }

    /* --- Tools Section on Mobile --- */
    .tools-section {
        padding: 3rem 1rem;
    }
    .tools-section h2 {
        font-size: 2rem;
    }

    /* --- Footer on Mobile --- */
    .footer-contact {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* ========================================================== */
/* === เพิ่มเติม: สำหรับจอที่แคบมาก ๆ (max-width: 375px) === */
/* ========================================================== */
@media (max-width: 375px) {
    .hero-section h1 {
        font-size: 2.1rem; /* ลดขนาดหัวข้อหลักลงอีกเล็กน้อย */
        line-height: 1.3;
    }

    .hero-content p {
        font-size: 0.9rem; /* ลดขนาดข้อความรองลงอีกเล็กน้อย */
        word-break: keep-all; /* ป้องกันการตัดคำภาษาไทยกลางคำ ทำให้ตัดที่ช่องว่างเท่านั้น */
    }
}