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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f4f6f8;
    color: #333;
    line-height: 1.5;
}

.container {
    animation: fadeIn 1s ease-in-out;
    max-width: 1100px;
    margin: auto;
    padding: 20px;
}
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* HEADER */
.header {
    background: linear-gradient(90deg, #0d5c9e, #2a7cc7);
    color: white;
    padding: 50px 25px;
    border-radius: 12px;
    text-align: left;
}

.header h1 {
    font-size: 38px;
    font-weight: 800;
}

.header span {
    color: #ffd54f;
}

.header p {
    margin-top: 10px;
    font-size: 18px;
    opacity: 0.95;
}

/* CONTENT */
.content {
    display: flex;
    align-items: center;
    gap: 30px;
    margin-top: 40px;
}

.left {
    flex: 1;
}

.right {
    flex: 1;
    text-align: center;
}

.book {
    width: 85%;
    max-width: 350px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

/* LIST */
.list {
    margin-top: 20px;
    padding: 0;
}

.list li {
    list-style: none;
    margin-bottom: 12px;
    font-size: 17px;
}

.list li::before {
    content: "✔";
    color: #2e7d32;
    margin-right: 10px;
    font-weight: bold;
}

/* IDEAL */
.ideal {
    margin-top: 50px;
    text-align: center;
}

.cards {
    display: flex;
    gap: 20px;
    margin-top: 25px;
}

.card {
    background: white;
    padding: 15px;
    border-radius: 12px;
    flex: 1;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-8px) scale(1.02);
}

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

/* TESTIMONIOS */
.testimonials {
    margin-top: 50px;
    text-align: center;
}

.testimonial-box {
    display: flex;
    gap: 20px;
    margin-top: 25px;
}

.testimonial {
    background: #eef3f8;
    padding: 20px;
    border-radius: 12px;
    flex: 1;
    font-style: italic;
    box-shadow: 0 5px 10px rgba(0,0,0,0.05);
}

/* PRICE */
.price {
    text-align: center;
    margin-top: 50px;
}

.price h2 {
    color: #f57c00;
    font-size: 42px;
    margin: 10px 0;
}

/* BUTTON */
.btn {
    display: inline-block;
    background: linear-gradient(180deg, #43a047, #2e7d32);
    color: white;
    padding: 16px 35px;
    margin-top: 15px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: bold;
    font-size: 18px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.2);
    top: 0;
    left: -100%;
    transition: 0.4s;
}

.btn:hover::after {
    left: 100%;
}

.btn:hover {
    transform: scale(1.07);
}

/* FOOTER */
.footer {
    text-align: center;
    margin-top: 25px;
    font-size: 14px;
}

.footer span {
    color: #2e7d32;
    font-weight: bold;
}

/* ========================= */
/* 📱 RESPONSIVE (MOBILE) */
/* ========================= */

@media (max-width: 900px) {
    .content {
        flex-direction: column;
        text-align: center;
    }

    .cards {
        flex-direction: column;
    }

    .testimonial-box {
        flex-direction: column;
    }

    .header {
        text-align: center;
    }
}

@media (max-width: 500px) {
    .header h1 {
        font-size: 28px;
    }

    .price h2 {
        font-size: 34px;
    }

    .btn {
        width: 100%;
    }
}