/* GLOBAL */
body {
    margin: 0;
    padding: 0;
    font-family: 'Comic Sans MS', Arial, sans-serif;
    background: #fff7e6;
    color: #333;
}

/* HERO */
.hero {
    background: linear-gradient(135deg, #ff9a9e, #fad0c4, #fbc2eb, #a18cd1);
    padding: 20px 15px;
    text-align: center;
    color: #fff;
    border-bottom-left-radius: 30px;
    border-bottom-right-radius: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin-top: 0;
}

.hero h1 {
    font-size: 32px;
    margin: 5px 0;
}

.hero p {
    font-size: 16px;
    margin: 0;
}

/* BACK BUTTON */
.btn-back {
    display: inline-block;
    margin-top: 10px;
    padding: 8px 14px;
    background: rgba(255,255,255,0.25);
    color: #fff;
    text-decoration: none;
    border-radius: 10px;
    font-size: 16px;
    backdrop-filter: blur(4px);
    transition: 0.2s;
}

.btn-back:hover {
    background: rgba(255,255,255,0.4);
}

/* HOME PAGE GRID */
.book-grid {
    display: grid;
    gap: 25px;
    padding: 30px;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.book-card {
    background: #ffffff;
    border-radius: 20px;
    padding: 15px;
    text-align: center;
    text-decoration: none;
    color: #333;
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.book-card img {
    width: 100%;
    border-radius: 15px;
}

/* BOOK DETAILS PAGE */
.book-details {
    max-width: 900px;
    margin: 30px auto;
    padding: 20px;
    display: flex;
    gap: 30px;
    align-items: flex-start;
    flex-wrap: wrap;
}

.book-cover {
    width: 280px;
    border-radius: 20px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}

.book-info {
    flex: 1;
    min-width: 260px;
}

.book-info h2 {
    margin-top: 0;
    font-size: 26px;
}

.book-info p {
    font-size: 16px;
    line-height: 1.5;
}

/* BUTTONS */
.btn-download {
    display: inline-block;
    margin-top: 15px;
    padding: 12px 20px;
    background: #4a6cf7;
    color: #fff;
    text-decoration: none;
    border-radius: 12px;
    font-size: 18px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    transition: transform 0.2s;
}

.btn-download:hover {
    transform: scale(1.05);
}

/* PAGE VIEWER */
.viewer {
    max-width: 900px;
    margin: 30px auto;
    padding: 20px;
    text-align: center;
}

/* FIXED ONE-LINE NAVIGATION */
.viewer-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: nowrap; /* FORCE one line */
}

.viewer-controls button {
    background: #a18cd1;
    border: none;
    padding: 8px 12px; /* slightly smaller */
    border-radius: 10px;
    color: white;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    white-space: nowrap;
}

.viewer-controls span {
    font-size: 16px;
    font-weight: bold;
    white-space: nowrap;
}

.viewer-frame {
    background: white;
    padding: 15px;
    border-radius: 20px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.15);
    margin-bottom: 20px;
}

.viewer-frame img {
    width: 100%;
    border-radius: 12px;
}

.viewer-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 20px;
    color: #777;
    font-size: 14px;
}

/* MOBILE FIXES */
@media (max-width: 900px) {
    .book-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 12px 10px;
    }

    .hero h1 {
        font-size: 26px;
    }

    .hero p {
        font-size: 14px;
    }

    .book-details {
        flex-direction: column;
        text-align: center;
    }

    .book-cover {
        width: 80%;
        margin: 0 auto;
    }

    .viewer-controls {
        gap: 8px;
    }

    .viewer-controls button {
        padding: 8px 10px;
        font-size: 16px;
    }
}