/* ===== Reset & Base ===== */
* {margin:0;padding:0;box-sizing:border-box;}
body {font-family: 'Segoe UI', Tahoma, sans-serif; line-height:1.6; color:#333; background:#f9f9f9;}
a {color:#4CAF50; text-decoration:none;}
a:hover {text-decoration:underline;}
.section {padding:80px 20px; text-align:center;}
.section-title {font-size:2rem; margin-bottom:20px; color:hsl(0, 0%, 13%);}
.section-desc {max-width:800px; margin:auto;}

/* ===== Header ===== */
.header {position:fixed; top:0; left:0; width:100%; background:#fff; box-shadow:0 2px 8px rgba(0,0,0,0.1); z-index:999;}
.navbar {max-width:1200px; margin:auto; display:flex; justify-content:space-between; align-items:center; padding:15px 20px;}
.logo {font-size:1.5rem; font-weight:bold; color:#4CAF50;}
.logo span {color:#222;}
.nav-links {list-style:none; display:flex; gap:20px;}
.nav-links a {font-weight:500; padding:8px 12px; transition:0.3s;}
.nav-links a:hover {background:#4CAF50; color:#fff; border-radius:6px;}

/* ===== Banner ===== */
.banner {
    height:100vh;
    background:url('../images/main_image.webp') center/cover fixed;
    display:flex; justify-content:center; align-items:center;
    text-align:center; color:#fff;
    position:relative;
}
.banner::before {
    content:""; position:absolute; top:0; left:0; right:0; bottom:0;
    background:rgba(0,0,0,0.5);
}
.banner-content {position:relative; z-index:2; max-width:none; padding:20px;}
.banner h1 {font-size:3rem; margin-bottom:30px;white-space:nowrap;text-shadow: 2px 2px 5px rgba(0,0,0,0.3);
            /* background: linear-gradient(90deg,#ffffff, #f2f2f2); -webkit-background-clip: text;
            -webkit-text-fill-color: transparent; */}
.banner p {font-size:2rem; margin-bottom:50px;text-shadow: 1px 1px 3px rgba(0,0,0,0.2);}
.btn-primary {
    background:#4CAF50; color:#fff; padding:12px 25px;
    border-radius:30px; font-weight:bold; transition:0.3s;
    font-size: 1.5rem;
}
.btn-primary:hover {background:#45a049;}

/* ===== Intro ===== */
.intro.section {
    margin: 50px auto; /* 60px trên/dưới, canh giữa ngang */
    padding:40px 20px; /* giống các section khác */
    max-width:900px;   /* giới hạn chiều rộng */
    /* margin:0 auto;     canh giữa */
    text-align:left;   /* văn bản canh trái dễ đọc hơn */
    line-height:1.8;   /* tăng khoảng cách dòng */
    color:#333;        /* màu chữ chính */
    background:#fff;   /* nền nếu muốn nổi bật */
    border-radius:12px; /* bo góc nhẹ */
    box-shadow:0 4px 12px rgba(0,0,0,0.1); /* bóng nhẹ */
}

.intro.section h2 {
    text-align: center;   /* canh giữa tiêu đề */
    margin-top: 30px;     /* khoảng cách trên */
    margin-bottom: 30px;  /* khoảng cách dưới */
}

.intro.section p {
    margin-bottom:16px; /* cách giữa các đoạn */
    font-size:1.1rem;
}

.intro.section a {
    color:#007BFF; /* link màu xanh rõ ràng */
    text-decoration:underline;
}

.intro.section em {
    font-style:italic; /* in nghiêng */
}

.intro.section strong {
    font-weight:bold; /* in đậm */
}

@media(max-width:768px){
    .intro.section {
        margin-top: 40px;
        font-size:1rem;
    }
}

/* ===== Services ===== */
.services-container {
    margin-top: 30px;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:30px;
    max-width:1000px;
    margin-left: auto;
    margin-right: auto;
    /* margin:auto; */
    padding:0 20px;
}
.service-card {
    background:#fff; padding:20px; border-radius:12px;
    box-shadow:0 4px 12px rgba(0,0,0,0.1);
    transition:transform 0.3s ease, box-shadow 0.3s ease;
}
.service-card img {width:90%; border-radius:10px; margin-bottom:15px;}
.service-card:hover {
    transform:translateY(-8px);
    box-shadow:0 8px 20px rgba(0,0,0,0.2);
}
.service-card h3 {margin-bottom:10px; color:#4CAF50;}

/* ===== Contact ===== */
/* .contact p {margin:10px 0; font-size:1.1rem;} */

/* ===== Contact ===== */
.contact h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 20px;
    background: linear-gradient(90deg, #333333, #555555);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.contact {
    background: #f9f9f9;
    padding: 40px 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contact:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.contact p {
    margin: 10px 0;
    font-size: 1.1rem;
    line-height: 1.6;
    color: #333;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.05);
}

.contact a {
    color: #007BFF;
    text-decoration: underline;
    transition: color 0.3s;
}

.contact a:hover {
    color: #0056b3;
}


/* ===== Footer ===== */
.footer {background:#222; color:#ccc; text-align:center; padding:20px;}


/* ===== Animation ===== */
.fade-in {opacity:0; animation:fadeIn 1s forwards;}
.fade-in-delay {opacity:0; animation:fadeIn 1.5s forwards 0.3s;}
.fade-in-delay2 {opacity:0; animation:fadeIn 1.5s forwards 0.6s;}
@keyframes fadeIn {from {opacity:0; transform:translateY(20px);} to {opacity:1; transform:translateY(0);}}

/* ===== Responsive ===== */
/* @media(max-width:768px){
    .banner h1{font-size:2.2rem;}
    .nav-links{display:none;}
} */
@media (max-width: 768px) {
    /* Banner */
    .banner {
        height: 70vh;
        background-attachment: scroll; /* bỏ fixed */
    }
    .nav-links{display:none;}
    .banner h1 {
        font-size: 2rem;
        white-space: normal;
        padding: 0 10px;
    }
    .banner p {
        font-size: 1.2rem;
        padding: 0 15px;
    }
    .btn-primary {
        font-size: 1rem;
        padding: 10px 18px;
    }
    .banner-content {
    max-width: 90%; /* giới hạn chiều ngang trên mobile */
    margin: 0 auto;
    }

    /* Chatbot */
    #chatbot-button {
        width: 55px;
        height: 55px;
        font-size: 22px;
        bottom: 15px;
        right: 15px;
    }
    #chatbot-container {
        width: 90%;
        max-width: 400px;
        height: 70vh;
        right: 5%;
        bottom: 90px;
        border-radius: 10px;
    }
}

/* ===== Nút Chatbot Nổi ===== */
#chatbot-button {
    position: fixed;
    bottom: 20px;
    right: 20px;

    /* Kiểu dáng */
    background: linear-gradient(135deg, #4CAF50 0%, #2e8b57 100%);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 65px;
    height: 65px;
    font-size: 28px;
    cursor: pointer;

    /* Hiệu ứng đổ bóng & ánh sáng */
    box-shadow: 0 8px 20px rgba(0,0,0,0.25),
                0 0 0 0 rgba(76,175,80,0.7);
    transition: 
        transform 0.25s ease,
        box-shadow 0.25s ease,
        background 0.3s ease;

    /* Luôn nổi trên cùng */
    z-index: 10000;
}

/* Hover – đổi màu + nảy nhẹ */
#chatbot-button:hover {
    background: linear-gradient(135deg, #58d68d 0%, #4CAF50 100%);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 12px 25px rgba(0,0,0,0.3),
                0 0 20px rgba(88,214,141,0.6);
}

/* Hiệu ứng rung nhẹ (pulse) */
@keyframes pulseGlow {
    0%   { box-shadow: 0 0 0 0 rgba(76,175,80,0.5); }
    70%  { box-shadow: 0 0 0 15px rgba(76,175,80,0); }
    100% { box-shadow: 0 0 0 0 rgba(76,175,80,0); }
}
#chatbot-button {
    animation: pulseGlow 2.5s infinite;
}

/* ===== Hộp Chatbot ===== */
#chatbot-container {
    display: none;
    position: fixed;
    bottom: 95px;     /* Tăng chút để tránh nút */
    right: 20px;
    width: 450px;
    height: 500px;
    background: #fff;
    border-radius: 14px;
    overflow: hidden;

    /* Đổ bóng đẹp */
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    z-index: 9999;

    /* Hiệu ứng mở ra */
    transform: scale(0.95);
    opacity: 0;
    transition: all 0.3s ease;
}
#chatbot-container.active {
    display: block;
    transform: scale(1);
    opacity: 1;
}

#chatbot-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}


/* Floating chatbot button
#chatbot-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    font-size: 30px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    z-index: 1000;
}

Chatbot iframe container 
#chatbot-container {
    display: none;
    position: fixed;
    bottom: 90px;
    right: 20px;
    width: 350px;
    height: 500px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    border-radius: 10px;
    overflow: hidden;
    z-index: 999;
}

#chatbot-container iframe {
    width: 100%;
    height: 100%;
    border: none;
} */