/* Reset cơ bản */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif; 
    color: #333;
    line-height: 1.6;
    background-color: #fff; 
}

/* Các biến màu cho dễ quản lý */
:root {
    --primary-green: #38761D; 
    --secondary-orange: #FF9900; 
    --dark-green: #1F4E34; 
    --light-bg-green: #e9f5e9; 
}

/* XÓA CÁC STYLE HEADER/NAV CŨ ĐỂ TRÁNH XUNG ĐỘT */
.navbar, .logo, .nav-links {
    /* Đảm bảo các class cũ không còn định nghĩa ở đây */
    display: none !important; 
}

/* --- Hero Section (Được thiết kế full-width) --- */
.hero-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 120px 80px;
    background-color: var(--light-bg-green);
}
.hero-content {
    flex: 1;
    padding-right: 50px;
}
.hero-content h1 {
    font-size: 48px;
    color: var(--dark-green);
    margin-bottom: 15px;
}
.hero-graphic {
    flex: 1;
    text-align: right;
}
.hero-graphic img {
    max-width: 100%;
    height: auto;
}

/* --- About Section 1 (Text & Image) --- */
.about-section-1 {
    padding: 80px 40px;
}
.about-container {
    display: flex;
    align-items: center;
    max-width: 1100px; 
    margin: 0 auto; 
}
.about-image {
    flex: 1;
    padding-right: 40px;
}
.about-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.about-text {
    flex: 1;
}

/* --- About Section 2 (Steps/Icons) --- */
.about-section-2 {
    background-color: var(--light-bg-green);
    padding: 80px 40px;
    text-align: center;
}
.steps-container {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    max-width: 1100px;
    margin: 40px auto 0;
}
.step {
    flex: 1;
    text-align: center;
}

/* --- Value Cards Section --- */
.value-cards-section {
    padding: 80px 40px;
    background-color: #f9f9f9;
}
.value-cards-container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 200px 200px;
    gap: 20px;
    max-width: 1100px; 
    margin: 0 auto; 
}
.value-card {
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}
.large-green-card {
    background-color: var(--primary-green);
    color: white;
    grid-area: 1 / 1 / 3 / 3; 
}
.small-green-card {
    background-color: var(--dark-green);
    color: white;
}
.small-orange-card {
    background-color: var(--secondary-orange);
    color: white;
}
.white-card {
    background-color: white;
    color: var(--dark-green);
}

/* ======================================================= */
/* --- MEDIA QUERIES (Smartphone - Dưới 768px) ----------- */
/* ======================================================= */
@media (max-width: 768px) {
    
    h1 {
        font-size: 32px !important; 
    }
    h2 {
        font-size: 24px !important; 
    }
    
    /* 1. HERO SECTION */
    .hero-section {
        flex-direction: column; 
        padding: 40px 20px;
        text-align: center;
    }
    .hero-content {
        order: 2; 
        padding-right: 0;
        margin-top: 30px;
    }
    .hero-graphic {
        order: 1; 
    }

    /* 2. ABOUT SECTION 1 */
    .about-section-1 {
        padding: 40px 20px;
    }
    .about-container {
        flex-direction: column; 
    }
    .about-image {
        padding-right: 0;
        margin-bottom: 20px;
    }

    /* 3. ABOUT SECTION 2 (Steps) */
    .about-section-2 {
        padding: 40px 20px;
    }
    .steps-container {
        flex-direction: column; 
        gap: 20px; 
    }

    /* 4. VALUE CARDS */
    .value-cards-section {
        padding: 40px 20px;
    }
    .value-cards-container {
        display: flex; 
        flex-direction: column;
        gap: 15px;
        grid-template-columns: 1fr; 
        grid-template-rows: auto;
    }
    .value-card {
        grid-area: unset !important; 
    }
}