/* =========================================================
   GLOBAL RESETS & BASE STYLE
   ========================================================= */

.bat-content,
.bat-grid,
.bat-hero-section {
    max-width: 1100px;
    margin: auto;
    padding: 60px 25px;
}

.bat-content h2 {
    font-size: 34px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #0A6B2E;
}

.bat-content p {
    line-height: 1.75;
    margin-bottom: 22px;
    font-size: 18px;
    color: #333;
}

.bat-list {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.bat-list li {
    margin-bottom: 15px;
    font-size: 18px;
    line-height: 1.65;
}

.bat-list span {
    font-weight: 700;
    color: #0A6B2E;
}


/* =========================================================
   HERO SECTION
   ========================================================= */

.bat-hero-section {
    position: relative;
    height: 95vh;
    padding-top: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

/* SVG Background */
.bat-hero-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bat-bg-svg {
    width: 135vmin;
    height: 135vmin;
    opacity: 0.08;
    mix-blend-mode: multiply;
    transform-origin: center;
    animation: batBGSpin 90s linear infinite;
}

@keyframes batBGSpin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.bat-stroke {
    stroke: #0A6B2E;
    stroke-width: 18;
    fill: none;
    stroke-linecap: round;
}

.bat-play {
    fill: #EB5B2E;
}

/* Content inside hero */
.bat-hero-inner {
    position: relative;
    z-index: 10;
    max-width: 900px;
}

.bat-logo {
    width: 150px;
    margin-bottom: 25px;
}

.bat-hero-inner h1 {
    font-size: 60px;
    font-weight: 800;
    letter-spacing: -1px;
    color: #0A6B2E;
    margin-bottom: 10px;
}

.bat-hero-inner .sub {
    font-size: 22px;
    color: #444;
    margin-bottom: 10px;
}

.bat-hero-inner .desc {
    font-size: 18px;
    color: #444;
    max-width: 650px;
    margin: 0 auto;
}


/* =========================================================
   GRID – 4 TRỤ CỘT
   ========================================================= */

.bat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 35px;
    max-width: 1200px;
}

.bat-card {
    background: #fff;
    padding: 35px 25px;
    border-radius: 14px;
    border: 1px solid #eaeaea;
    box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    text-align: center;
    position: relative;
    transition: 0.35s;
}

.bat-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 26px rgba(0,0,0,0.08);
}

.bat-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
    color: #0A6B2E;
}

.bat-card .index {
    display: inline-block;
    font-size: 48px;
    font-weight: 800;
    color: #EB5B2E;
    opacity: 0.15;
    margin-bottom: 10px;
}

.bat-card p {
    color: #444;
    line-height: 1.6;
}


/* =========================================================
   SCROLL ANIMATION (AOS-like without library)
   ========================================================= */

[data-animate] {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease-out;
}

[data-animate].active {
    opacity: 1;
    transform: translateY(0);
}


/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 1024px) {
    .bat-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .bat-hero-section {
        height: auto;
        padding: 140px 20px 100px;
    }

    .bat-hero-inner h1 {
        font-size: 42px;
    }
}

@media (max-width: 550px) {
    .bat-grid {
        grid-template-columns: 1fr;
    }

    .bat-hero-inner h1 {
        font-size: 34px;
    }

    .bat-bg-svg {
        width: 160vmin;
        height: 160vmin;
    }
}