/*
 * Professional Frontend Styling for FM Epaper System - V9 (Mobile Optimized Nav)
 * File: assets/css/viewer.css
 * Description: Added styles for the new header navigation form.
 */

/* --- Main Container & Global Settings --- */
.epaper-container {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --light-bg: #f0f2f5;
    --white-bg: #ffffff;
    --text-color: #212529;
    --border-color: #dee2e6;

    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--light-bg);
}

/* --- Top Header Bar --- */
.epaper-header {
    background-color: var(--white-bg);
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    z-index: 100;
    position: relative;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    gap: 15px;
}
.epaper-header-main h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 0;
}

/* --- Header Navigation Form --- */
.epaper-header-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}
#epaper-date-changer-form {
    display: flex;
    gap: 8px;
    align-items: center;
}
#epaper-date-changer-form select,
#epaper-date-changer-form input {
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--white-bg);
    transition: border-color 0.2s;
}
#epaper-date-changer-form select {
    min-width: 150px;
}

#epaper-date-changer-form select:hover,
#epaper-date-changer-form input:hover {
    border-color: var(--primary-color);
}
#epaper-date-changer-form button {
    padding: 8px 12px;
    font-size: 14px;
    background-color: var(--primary-color);
    color: #fff;
    cursor: pointer;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    font-weight: 600;
    transition: background-color 0.2s;
}
#epaper-date-changer-form button:hover {
    background-color: #0056b3;
}
#epaper-date-changer-form button:disabled {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    cursor: not-allowed;
}


/* --- Main Viewer Layout --- */
.epaper-viewer {
    display: flex;
    height: calc(100vh - 67px); /* Base height */
    overflow: hidden;
}

/* --- Thumbnail Sidebar (Desktop) --- */
.epaper-thumbs {
    flex: 0 0 160px;
    background-color: var(--white-bg);
    padding: 8px;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}
.epaper-thumbs img {
    display: block; width: 100%; height: auto;
    margin-bottom: 8px; border-radius: 4px; border: 2px solid var(--border-color);
    cursor: pointer; transition: all 0.2s ease-in-out;
}
.epaper-thumbs img:hover { border-color: var(--primary-color); }
.epaper-thumbs img.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 8px rgba(0, 123, 255, 0.5);
    transform: scale(1.03);
}
.epaper-processing-notice { padding: 20px; text-align: center; color: var(--secondary-color); }

/* --- Main Image Display Area --- */
.epaper-main {
    flex: 1; display: flex; flex-direction: column;
    overflow: hidden; position: relative; background-color: var(--light-bg);
}
#image-viewer-container {
    flex: 1; display: flex; justify-content: center; align-items: center;
    overflow: hidden; position: relative; padding: 10px;
}
#main-page-image {
    max-width: 100%; max-height: 100%;
    transition: transform 0.2s ease-out; transform-origin: center center;
    background-color: var(--white-bg); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}
#main-page-image.pannable { cursor: grab; }
#main-page-image.panning { cursor: grabbing; }

/* --- DESKTOP Viewer UI Controls --- */
.nav-button {
    position: absolute; top: 50%; transform: translateY(-50%);
    display: flex; align-items: center; justify-content: center;
    background-color: rgba(33, 37, 41, 0.5);
    color: #fff; border: none; cursor: pointer;
    transition: all 0.2s ease; border-radius: 50%;
    width: 44px; height: 44px; font-size: 24px; z-index: 10;
}
.nav-button:hover { background-color: var(--primary-color); }
.nav-button.prev { left: 20px; }
.nav-button.next { right: 20px; }
.nav-button:disabled { opacity: 0.3; cursor: not-allowed; }

.viewer-controls-desktop {
    position: absolute; top: 20px; left: 50%;
    transform: translate3d(-50%, 0, 0); display: flex; gap: 5px;
    background-color: rgba(255, 255, 255, 0.9);
    border: 1px solid #ccc; border-radius: 25px; padding: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1); backdrop-filter: blur(4px); z-index: 10;
}
.viewer-controls-desktop button, .viewer-controls-desktop a {
    display: flex; align-items: center; justify-content: center;
    background: none; border: none; font-size: 18px; color: #333;
    width: 40px; height: 40px; cursor: pointer; text-decoration: none;
}
.viewer-controls-desktop button:hover, .viewer-controls-desktop a:hover { color: var(--primary-color); }
.viewer-controls-desktop .separator { width: 1px; background-color: #ccc; margin: 8px 5px; }
.viewer-controls-desktop svg { width: 20px; height: 20px; }


/* Hide mobile toolbar on desktop */
.viewer-controls-mobile { display: none; }


/* --- MOBILE Responsive Adjustments --- */
@media (max-width: 900px) {
    .epaper-header {
        flex-direction: column;
        align-items: flex-start;
    }

    /* MODIFICATION: Make the nav container take full width */
    .epaper-header-nav {
        width: 100%;
    }

    /* MODIFICATION: Use grid for a clean mobile layout */
    #epaper-date-changer-form {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-template-areas:
            "edition date"
            "button button";
        gap: 8px;
        width: 100%;
    }

    #epaper-date-changer-form select {
        grid-area: edition;
        min-width: 0; /* Reset min-width */
    }

    #epaper-date-changer-form input {
        grid-area: date;
    }

    #epaper-date-changer-form button {
        grid-area: button;
    }

    .epaper-viewer {
        /* Adjust height to account for taller, wrapped header */
        height: calc(100vh - 145px); 
    }
}

@media (max-width: 768px) {
    .epaper-viewer {
        flex-direction: column;
        height: calc(100vh - 145px - 51px);
    }
    .epaper-main { flex: 1; }

    .epaper-thumbs {
        flex: 0 0 95px; order: -1; width: 100%;
        overflow-x: auto; overflow-y: hidden;
        white-space: nowrap; padding: 8px;
        border-top: none; border-bottom: 1px solid var(--border-color);
        border-right: none; background-color: var(--white-bg);
    }
    .epaper-thumbs img {
        display: inline-block; height: 100%; width: auto;
        margin-right: 8px; margin-bottom: 0;
    }
    
    .nav-button, .viewer-controls-desktop { display: none; }

    .viewer-controls-mobile {
        display: flex; justify-content: space-between; align-items: center;
        position: fixed; bottom: 0; left: 0; right: 0;
        background-color: var(--white-bg);
        border-top: 1px solid var(--border-color);
        padding: 4px 5px;
        box-shadow: 0 -2px 5px rgba(0,0,0,0.05);
        z-index: 100;
    }
    .viewer-controls-mobile .mobile-center-group,
    .viewer-controls-mobile .mobile-right-group {
        display: flex; justify-content: center;
        align-items: center; gap: 5px;
    }
    .viewer-controls-mobile button, .viewer-controls-mobile a {
        background: none; border: none;
        color: var(--secondary-color);
        font-size: 20px; cursor: pointer;
        padding: 5px; text-align: center; text-decoration: none;
        min-width: 40px;
    }
    .viewer-controls-mobile button:hover, .viewer-controls-mobile a:hover { color: var(--primary-color); }
    .viewer-controls-mobile button:disabled { opacity: 0.3; color: var(--border-color); }
}