/* =========================================
   Case Studies Manuscript Library
   ========================================= */

.case-studies-library {
    position: relative;
    background: radial-gradient(circle at 20% 20%, rgba(216, 199, 180, 0.35), transparent 55%),
                radial-gradient(circle at 80% 0%, rgba(235, 229, 216, 0.45), transparent 45%),
                #f7f3ec;
    color: #1f1b16;
    padding: var(--space-16) var(--space-5) var(--space-20);
    overflow: hidden;
}

.case-studies-library::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='120' height='120' viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd' stroke='%239c8b7c' stroke-opacity='0.1'%3E%3Cpath d='M0 119.5h120M119.5 0v120'/%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.7;
    pointer-events: none;
}

.case-studies-library > * {
    position: relative;
    z-index: 1;
}

.library-hero {
    max-width: 920px;
    margin: 0 auto var(--space-14);
    padding: var(--space-4);
}

.manuscript-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-4);
}

.manuscript {
    position: relative;
    perspective: 1400px;
    border-radius: 18px;
}

.manuscript__trigger {
    width: 100%;
    border: none;
    background: transparent;
    padding: 0;
    text-align: left;
    cursor: pointer;
}

.manuscript__cover {
    position: relative;
    padding: var(--space-8);
    border-radius: 18px;
    background: #fffdf7;
    box-shadow: 0 18px 28px rgba(36, 30, 22, 0.18);
    transform-origin: left center;
    transform-style: preserve-3d;
    transition: transform 500ms var(--anim-ease-out), box-shadow 500ms var(--anim-ease-out);
    min-height: 320px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: #2b2018;
}

.manuscript__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: var(--space-3);
}

.manuscript__chapter {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    line-height: 1.2;
    color: #2f1c16;
    margin: var(--space-5) 0 var(--space-4);
}

.manuscript__preview {
    margin: var(--space-4) 0 var(--space-6);
    font-size: var(--text-base);
    line-height: 1.6;
    color: rgba(43, 32, 24, 0.8);
}

.manuscript__cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: #5a3824;
}

.manuscript__cta::after {
    content: '\2192';
    font-size: 1rem;
    transition: transform 200ms ease;
}

.manuscript__trigger:focus-visible .manuscript__cover {
    outline: 3px solid rgba(84, 53, 32, 0.6);
    outline-offset: 4px;
}

.manuscript__edges {
    position: absolute;
    inset: 12px;
    border-radius: 14px;
    border: 1px solid rgba(68, 48, 33, 0.18);
    opacity: 0.4;
    pointer-events: none;
}

.manuscript[data-theme="clay"] .manuscript__cover {
    background: linear-gradient(135deg, #fffdf7, #f3e3d4);
}

.manuscript[data-theme="sage"] .manuscript__cover {
    background: linear-gradient(135deg, #fdfcf7, #e8f1e3);
}

.manuscript[data-theme="ink"] .manuscript__cover {
    background: linear-gradient(135deg, #fefbf4, #e4e7f0);
}

.manuscript.is-open .manuscript__cover {
    transform: rotateY(-12deg) translateX(-6px);
    box-shadow: 0 35px 60px rgba(0, 0, 0, 0.5);
}

.manuscript.is-open .manuscript__cta::after {
    transform: translateX(4px);
}

.manuscript__content {
    position: fixed;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-10);
    background: rgba(6, 10, 12, 0.82);
    backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 350ms var(--anim-ease-out);
    z-index: 1000;
}

.manuscript.is-open .manuscript__content {
    opacity: 1;
    pointer-events: auto;
}

.manuscript__pages {
    position: relative;
    width: min(640px, 92vw);
    max-height: 80vh;
    overflow-y: auto;
    padding: var(--space-10) var(--space-10) var(--space-8);
    background: var(--paper-cream, #f6f1e9);
    color: var(--ink, #1d1f24);
    border-radius: 22px;
    box-shadow: 0 30px 60px rgba(15, 18, 26, 0.35);
    transform-origin: left center;
    transform: rotateX(8deg) translateY(16px);
    opacity: 0;
    transition: transform 500ms var(--anim-ease-out), opacity 300ms var(--anim-ease-out);
}

.manuscript.is-open .manuscript__pages {
    transform: rotateX(0deg) translateY(0);
    opacity: 1;
}

.manuscript__bookmark {
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    width: 18px;
    height: 90px;
    background: linear-gradient(180deg, #c46a36, #a04d22);
    border-radius: 4px 4px 2px 2px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.manuscript__body {
    font-size: 1.05rem;
    line-height: 1.85;
    font-family: 'Source Serif Pro', serif;
    color: var(--ink, #1c1e21);
    margin-bottom: var(--space-8);
}

.manuscript__body p {
    margin-bottom: var(--space-4);
}

.manuscript__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--soft-clay, #7c5c4b);
}

.manuscript__meta span {
    font-weight: 600;
    color: var(--ink, #1c1e21);
}

.manuscript__close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    transform: translate(35%, -35%);
    border: none;
    background: #2d2018;
    color: #fff6ef;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(24, 16, 10, 0.35);
    transition: background 200ms ease, transform 200ms ease;
    z-index: 2;
}

.manuscript__close:hover,
.manuscript__close:focus-visible {
    background: #513522;
}

.manuscript-empty {
    text-align: center;
    padding: var(--space-16);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 18px;
    color: var(--paper-cream, #f6f1e9);
}

.manuscript__content[hidden] {
    display: none;
}

.manuscript__pages::-webkit-scrollbar {
    width: 10px;
}

.manuscript__pages::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 999px;
}

.manuscript__pages::-webkit-scrollbar-thumb {
    background: rgba(36, 32, 28, 0.3);
    border-radius: 999px;
}

@media (max-width: 1024px) {
    .manuscript-grid {
        gap: var(--space-6);
    }
}

@media (max-width: 768px) {
    .case-studies-library {
        padding: var(--space-12) var(--space-4) var(--space-16);
    }

    .manuscript-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .library-hero__title {
        font-size: clamp(2.25rem, 8vw, 3rem);
    }

    .manuscript__cover {
        min-height: 260px;
        padding: var(--space-6);
    }

    .manuscript__content {
        padding: var(--space-6);
    }

    .manuscript__pages {
        max-height: 85vh;
        padding: var(--space-8) var(--space-6);
    }
}

@media (prefers-reduced-motion: reduce) {
    .manuscript__cover,
    .manuscript__content,
    .manuscript__pages {
        transition: none;
    }

    .manuscript__cover,
    .manuscript__pages {
        transform: none;
    }
}

.featured-volume {
    padding: clamp(3rem, 8vw, 5rem) 0;
}

.featured-volume__container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    padding: clamp(2rem, 6vw, 3.5rem);
    background: rgba(255, 255, 255, 0.92);
    border-radius: 24px;
    box-shadow: 0 35px 60px rgba(0, 0, 0, 0.07);
}

.featured-volume__media img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    object-fit: cover;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.featured-volume__placeholder {
    min-height: 320px;
    border: 2px dashed rgba(42, 41, 39, 0.2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-style: italic;
    color: rgba(42, 41, 39, 0.6);
}

.featured-volume__content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.featured-volume__eyebrow {
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    color: rgba(42, 41, 39, 0.7);
    margin: 0;
}

.featured-volume__title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin: 0;
}

.featured-volume__summary {
    font-size: 1.05rem;
    color: rgba(42, 41, 39, 0.8);
}

.featured-volume__specs {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.75rem;
}

.featured-volume__specs li {
    background: rgba(42, 41, 39, 0.05);
    border-radius: 999px;
    padding: 0.65rem 1rem;
    font-size: 0.95rem;
}

.featured-volume__quote {
    font-family: "Playfair Display", serif;
    font-size: 1.15rem;
    border-left: 3px solid rgba(42, 41, 39, 0.3);
    padding-left: 1rem;
    color: rgba(42, 41, 39, 0.85);
    margin: 0;
}

.featured-volume__toggle {
    align-self: flex-start;
    border: none;
    background: none;
    font-size: 1rem;
    font-weight: 600;
    color: #2a2927;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    cursor: pointer;
}

.featured-volume__toggle::after {
    content: '↘';
    transition: transform 0.3s ease;
}

.featured-volume__toggle[aria-expanded="true"]::after {
    transform: rotate(-135deg);
}

.featured-volume__details {
    margin-top: 1rem;
    border-top: 1px solid rgba(42, 41, 39, 0.1);
    padding-top: 1rem;
    animation: fadeIn 0.4s ease;
}

.featured-volume__cta {
    margin-top: 1.5rem;
}

.featured-volume__details[hidden] {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}