/* --- কালার প্যালেট ---
Primary: #00897b (Dark Teal/Cyan)
Secondary: #004d40 (Darker Green/Teal)
Accent: #ffb300 (Amber/Gold for highlight)
Background: #f4f8f7 (Lightest Teal)
*/

/* বেসিক রিসেট */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif; /* বাংলা ফন্টের জন্য: 'Noto Sans Bengali', sans-serif; ব্যবহার করতে পারেন */
    line-height: 1.6;
    color: #333;
    background-color: #f4f8f7;
    overflow-x: hidden; /* হরাইজন্টাল স্ক্রলিং আটকানোর জন্য */
}

/* কন্টেইনার এবং সেকশন স্টাইল */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.section-padding {
    padding: 80px 0;
}

h2, h3 {
    color: #004d40;
    text-align: center;
    margin-bottom: 40px;
}

h3 {
    font-size: 32px;
}

/* --- হেডার এবং নেভিগেশন --- */
.main-header {
    background: #ffffff;
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo a {
    color: #00897b; 
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
    transition: color 0.3s;
}

.menu-toggle {
    display: none; /* ডেস্কটপে লুকানো */
    background: none;
    border: none;
    font-size: 24px;
    color: #00897b;
    cursor: pointer;
}

.main-nav ul {
    list-style: none;
    display: flex;
}

.main-nav ul li a {
    text-decoration: none;
    color: #333;
    padding: 10px 18px;
    display: block;
    transition: color 0.3s, border-bottom 0.3s;
    font-weight: 500;
}

.main-nav ul li a:hover, .main-nav ul li a.active {
    color: #00897b;
    border-bottom: 3px solid #00897b;
}

/* --- হিরো সেকশন --- */
.hero-section {
    background: url('images/hero_bg.jpg') no-repeat center center/cover;
    height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5); /* গাঢ় ওভারলে */
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
    padding: 20px;
}

.hero-content h2 {
    font-size: 52px;
    margin-bottom: 10px;
    color: white;
    text-shadow: 1px 1px 3px #000;
}

.hero-content p {
    font-size: 24px;
    margin-bottom: 40px;
}

/* বাটন স্টাইল */
.btn {
    text-decoration: none;
    padding: 14px 30px;
    border-radius: 50px; /* পিল আকৃতি */
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    margin: 5px;
}

.primary-btn {
    background-color: #ffb300; /* এক্সেন্ট কালার */
    color: #004d40;
    border: 2px solid #ffb300;
}

.primary-btn:hover {
    background-color: #004d40;
    color: #ffb300;
    border-color: #004d40;
}

.secondary-btn {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.secondary-btn:hover {
    background-color: white;
    color: #004d40;
    border-color: white;
}

.small-btn {
    padding: 10px 20px;
    font-size: 14px;
}

/* --- সংক্ষিপ্ত পরিচয় সেকশন --- */
.intro-section {
    background-color: #ffffff;
}

.lead-text {
    text-align: center;
    font-size: 18px;
    max-width: 900px;
    margin: 0 auto 30px auto;
    color: #555;
}

.intro-grid {
    display: flex;
    gap: 40px;
    align-items: center;
    margin-top: 40px;
}

.intro-text {
    flex: 1;
    padding: 20px;
}

.intro-image-container {
    flex: 1;
    text-align: center;
}

.intro-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

/* --- মিশন এবং ভিশন হাইলাইট --- */
.mv-highlight {
    background-color: #e0f2f1; /* হালকা টিল সবুজ */
}

.mv-grid {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

.mv-card {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    flex: 1;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.mv-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.mv-card h4 {
    color: #004d40;
    margin-bottom: 15px;
    font-size: 22px;
}

.icon-large {
    font-size: 50px;
    color: #00897b;
    margin-bottom: 15px;
}

/* --- পরিষেবা হাইলাইট --- */
.services-highlight {
    background-color: #ffffff;
}

.service-cards {
    display: flex;
    justify-content: space-around;
    gap: 30px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.service-card {
    background-color: #f9f9f9;
    padding: 30px;
    border-radius: 10px;
    border-top: 5px solid #ffb300; /* এক্সেন্ট টপ বর্ডার */
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    flex: 1;
    min-width: 250px;
    text-align: center;
    transition: all 0.3s;
}

.service-card:hover {
    background-color: #e0f2f1;
    transform: translateY(-5px);
}

.icon-highlight {
    font-size: 45px;
    color: #00897b;
    margin-bottom: 15px;
}

.service-card h4 {
    color: #004d40;
    margin-bottom: 10px;
}

.centered-btn {
    display: block;
    width: fit-content;
    margin: 0 auto;
}

/* --- ফুটার --- */
.main-footer {
    background-color: #004d40; /* ডার্ক গ্রিন/टील */
    color: white;
    padding: 50px 0 10px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    padding-bottom: 30px;
    border-bottom: 1px solid #00695c;
}

.footer-section {
    margin-bottom: 30px;
    width: 25%;
    min-width: 200px;
}

.footer-section h4 {
    color: #ffb300;
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li a, .footer-section p {
    color: #ccc;
    text-decoration: none;
    line-height: 2.2;
    font-size: 15px;
}

.footer-section ul li a:hover {
    color: #ffb300;
}

.social-links a {
    color: white;
    font-size: 18px;
    margin-right: 15px;
    transition: color 0.3s;
}

.social-links a:hover {
    color: #ffb300;
}

.footer-bottom {
    text-align: center;
    padding-top: 15px;
    font-size: 13px;
    color: #aaa;
}


/* --- রেসপন্সিভ ডিজাইন (মোবাইল এবং ট্যাবলেট) --- */
@media (max-width: 992px) {
    /* ট্যাবলেট */
    .intro-grid {
        flex-direction: column;
    }

    .intro-text, .intro-image-container {
        flex: none;
        width: 100%;
    }
    
    .mv-grid {
        flex-wrap: wrap;
        justify-content: center;
    }

    .mv-card {
        min-width: 45%;
    }

    .footer-section {
        width: 45%;
    }
}

@media (max-width: 768px) {
    /* মোবাইল */
    .main-header {
        padding: 15px 20px;
    }
    
    .logo a {
        font-size: 20px;
    }

    /* মোবাইল মেনু টগল */
    .main-nav {
        display: none;
        position: absolute;
        top: 60px; /* হেডার এর উচ্চতা */
        left: 0;
        right: 0;
        background: #ffffff;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        z-index: 999;
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        padding: 10px 0;
    }

    .main-nav ul li a {
        padding: 12px 20px;
        border-bottom: 1px solid #eee;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-section {
        height: 50vh;
    }
    
    .hero-content h2 {
        font-size: 36px;
    }
    
    .hero-content p {
        font-size: 18px;
    }

    .cta-buttons {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    h3 {
        font-size: 28px;
    }

    .mv-grid {
        flex-direction: column;
    }

    .mv-card {
        min-width: 100%;
    }

    .service-cards {
        flex-direction: column;
    }

    .service-card {
        min-width: 100%;
    }

    .footer-section {
        width: 100%;
        text-align: center;
    }
    
    .footer-section.links ul {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
}