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

body {
    font-family: "Segoe UI", Arial, sans-serif;
    background: #ececec;
    color: #222;
    line-height: 1.6;
}

/* NAVBAR */
.navbar {
    max-width: 1200px;
    margin: 20px auto 0;
    padding: 12px 30px;
    background: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 3px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.navbar h2 {
    font-weight: 500;
    color: #111;
}

.home-btn {
    text-decoration: none;
    background: #2fad2f;
    color: white;
    padding: 8px 16px;
    border-radius: 2px;
    font-size: 0.95rem;
    transition: 0.2s;
}

.home-btn:hover {
    background: #249624;
}

/* Main page wrapper */
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 30px 40px;
}

/* Top app header */
header {
    background: linear-gradient(135deg, #7fd34e, #36a62d);
    color: white;
    padding: 50px 40px;
    border-radius: 4px;
    margin-bottom: 35px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

header h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

/* Download box */
.download-box {
    background: white;
    padding: 30px;
    border-left: 8px solid #2fad2f;
    margin-bottom: 35px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border-radius: 3px;
}

.download-box h2 {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: 10px;
    color: #111;
}

.download-box p {
    font-size: 1rem;
    color: #555;
    margin-bottom: 20px;
}

.download-btn {
    display: inline-block;
    background: #2fad2f;
    color: white;
    text-decoration: none;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 2px;
    transition: background 0.2s ease, transform 0.15s ease;
}

.download-btn:hover {
    background: #249624;
    transform: translateY(-1px);
}

/* Content sections */
.about,
.features,
.details,
.images {
    background: white;
    padding: 30px;
    margin-bottom: 35px;
    border-radius: 3px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.07);
}

.about h2,
.features h2,
.details h2,
.images h2 {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: 20px;
    color: #111;
}

.about p {
    margin-bottom: 20px;
    color: #444;
    max-width: 850px;
}

/* Feature list */
.about ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px 20px;
    margin-top: 10px;
}

.about li {
    background: #f7f7f7;
    padding: 14px 16px;
    border-left: 4px solid #2fad2f;
    border-radius: 2px;
    font-size: 0.98rem;
    color: #333;
}

/* Card grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 22px;
    margin-top: 10px;
}

.card {
    background: #f8f8f8;
    padding: 24px 20px;
    border-top: 5px solid #2fad2f;
    min-height: 170px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border-radius: 2px;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.10);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: #111;
}

.card p {
    color: #555;
    font-size: 0.97rem;
}

/* IMAGE GRID */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.image-card {
    background: #f8f8f8;
    border-top: 5px solid #2fad2f;
    padding: 12px;
    border-radius: 2px;
    text-align: center;
    transition: 0.2s;
}

.image-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.10);
}

.image-card img {
    width: 100%;
    border-radius: 2px;
    margin-bottom: 10px;
}

.image-card p {
    font-size: 0.95rem;
    color: #444;
}

/* Footer */
footer {
    text-align: center;
    color: #666;
    font-size: 0.95rem;
    padding-top: 10px;
}

/* Responsive tweaks */
@media (max-width: 768px) {
    .container {
        margin: 20px auto;
        padding: 0 15px 30px;
    }

    .navbar {
        padding: 10px 15px;
    }

    header {
        padding: 35px 24px;
    }

    header h1 {
        font-size: 2.2rem;
    }

    .download-box,
    .about,
    .features,
    .details,
    .images {
        padding: 22px;
    }

    .about h2,
    .features h2,
    .download-box h2,
    .details h2,
    .images h2 {
        font-size: 1.6rem;
    }

    .download-btn {
        width: 100%;
        text-align: center;
    }
}