/* ========== Fonts (include in _Host.cshtml or index.html) ========== 
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&family=Merriweather:wght@300;400;700&display=swap" rel="stylesheet">
==================================================================== */

:root {
    /* Palette (warm & educational, tweak as needed) */
    --bg: #FFF6F2; /* soft warm background */
    --card: #FFFFFF;
    --accent-900: #29104A; /* deep indigo for spine/header */
    --accent-700: #5A2B87; /* mid tone */
    --accent-400: #A86ECF; /* lighter purple */
    --muted-text: #150016;
    --shelf: linear-gradient(180deg,#E7D0B8 0%, #DABE9C 100%);
    --glass: rgba(255,255,255,0.6);
    --shadow-1: 0 6px 18px rgba(16,8,30,0.12);
    --shadow-2: 0 10px 30px rgba(16,8,30,0.16);
    --card-radius: 14px;
    --spine-width: 14px;
}

/* Page */
body {
    background: var(--bg);
    font-family: 'Inter', Arial, sans-serif;
    color: var(--muted-text);
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container / grid */
.library-page {
    padding: 2rem;
    display: flex;
    justify-content: center;
}

.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    width: 100%;
    max-width: 1200px;
    perspective: 1400px; /* allow 3D tilt */
    position: relative;
    padding-bottom: 3.2rem; /* room for shelf */
}

    /* Shelf effect — sits behind cards */
    .library-grid::after {
        content: "";
        position: absolute;
        left: 2rem;
        right: 2rem;
        bottom: 0.5rem;
        height: 56px;
        background: var(--shelf);
        border-radius: 10px;
        box-shadow: 0 8px 18px rgba(0,0,0,0.08) inset;
        z-index: 0;
        transform: translateY(8px);
        filter: saturate(.98);
    }

/* Each card */
.library-card {
    position: relative;
    z-index: 2; /* above the shelf */
    display: flex;
    flex-direction: column;
    max-width: 260px;
    margin: 0 auto;
    background: linear-gradient(180deg, var(--card) 0%, #FBFBFB 100%);
    border-radius: var(--card-radius);
    border: 1px solid rgba(41,16,74,0.06);
    box-shadow: var(--shadow-1);
    overflow: visible;
    transition: transform 320ms cubic-bezier(.2,.9,.3,1), box-shadow 320ms;
    transform-origin: center;
    transform-style: preserve-3d;
    will-change: transform;
    -webkit-tap-highlight-color: transparent;
}

    /* Slight lift + 3D tilt on hover */
    .library-card:hover {
        transform: translateY(-12px) rotateX(4deg) rotateY(2deg) scale(1.03);
        box-shadow: var(--shadow-2);
    }

    /* Book spine (left) */
    .library-card .book-spine {
        position: absolute;
        top: 0;
        left: 0;
        width: var(--spine-width);
        height: 100%;
        border-top-left-radius: var(--card-radius);
        border-bottom-left-radius: var(--card-radius);
        background: linear-gradient(180deg, var(--accent-900), var(--accent-700));
        box-shadow: 2px 0 6px rgba(0,0,0,0.12);
        z-index: 3;
        transform-origin: left center;
        transform: translateZ(40px) rotateY(-12deg) translateX(-6px);
    }

/* Cover (image) */
.cover-wrap {
    border-top-left-radius: calc(var(--card-radius) - 2px);
    border-top-right-radius: calc(var(--card-radius) - 2px);
    overflow: hidden;
    position: relative;
    z-index: 2;
}

.course-cover {
    width: 100%;
    height: 220px; /* tall textbook-y */
    object-fit: cover;
    display: block;
    transition: transform 420ms;
    transform-origin: center;
}

/* subtle parallax on hover */
.library-card:hover .course-cover {
    transform: scale(1.06) translateZ(20px);
}

/* header with accent band (book title strip) */
.card-header {
    background: linear-gradient(90deg, rgba(41,16,74,0.95), rgba(90,43,135,0.9));
    color: #fff;
    text-align: center;
    padding: 0.6rem 0.75rem;
    z-index: 2;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

    .card-header .course-name {
        margin: 0;
        font-size: 1rem;
        font-weight: 700;
        font-family: 'Merriweather', serif;
        line-height: 1.15;
        text-overflow: ellipsis;
        white-space: nowrap;
        overflow: hidden;
    }

/* body */
.card-body {
    padding: 1rem;
    z-index: 2;
    flex: 1 1 auto;
    min-height: 110px;
}

    .card-body p {
        margin: 0.35rem 0;
        font-size: 0.92rem;
        color: rgba(21,0,22,0.9);
    }

/* footer & button */
.card-footer {
    padding: 0.85rem;
    text-align: center;
    z-index: 2;
}

.details-button {
    background: linear-gradient(180deg, var(--accent-700), var(--accent-400));
    color: #fff;
    border: none;
    padding: 0.55rem 0.9rem;
    font-size: 0.92rem;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 6px 14px rgba(58,30,100,0.12);
    transition: transform 160ms, box-shadow 160ms, opacity 160ms;
}

    .details-button:hover {
        transform: translateY(-3px);
        box-shadow: 0 10px 22px rgba(58,30,100,0.18);
    }

/* tiny badge on corner (optional) */
.library-card .corner-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(255,255,255,0.85);
    color: #29104A;
    padding: 4px 8px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.8rem;
    z-index: 4;
    box-shadow: 0 4px 10px rgba(0,0,0,0.06);
}

/* Responsive */
@media (max-width: 880px) {
    .course-cover {
        height: 190px;
    }
}

@media (max-width: 600px) {
    .library-grid {
        grid-template-columns: 1fr;
        padding-bottom: 4.2rem;
    }

    .course-cover {
        height: 240px;
    }
    /* tall and scrollable on mobile */
}

/* Accessibility: respects reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .library-card, .course-cover, .details-button {
        transition: none !important;
        transform: none !important;
    }
}