/* ==========================================================================
   E-LIBRARY MINSAGA — stylesheet
   Arah desain: rak buku fisik. Latar hijau muda (dinding di belakang rak),
   setiap buku dirender sebagai buku tertutup berdiri di rak kayu, dengan
   warna sampul bervariasi, tinggi & kemiringan yang sedikit tidak seragam
   supaya terasa seperti rak yang benar-benar ditata tangan.
   ========================================================================== */

:root {
    /* -- latar & tinta -- */
    --bg: #e0e8db;
    --bg-panel: #eef6e8;
    --ink: #142119;
    --ink-soft: #2c3d33; /* dipekatkan dari #4b5d50 agar tidak menyatu dengan bg */
    --forest: #2f5d45;
    --forest-deep: #16301f; /* sedikit lebih gelap dari sebelumnya, untuk judul & label */
    --stamp: #b5482c;
    --line: #c9d9c2;
    --line-soft: #dce7d5;

    /* -- rak kayu -- */
    --wood-light: #a97c50;
    --wood: #8b5e3c;
    --wood-deep: #5e3e27;

    /* -- label & tepi halaman -- */
    --label-bg: #f3ecdd;
    --label-ink: #3a2a1a;
    --page-edge: #ede6d3;
    --page-edge-deep: #ddd1b3;

    /* -- teks di atas sampul buku (semua sampul gelap) -- */
    --cover-ink: #f7f1e4;
    --cover-ink-soft: rgba(247, 241, 228, 0.72);

    /* -- tipografi -- */
    --font-display: 'Lora', 'Iowan Old Style', serif;
    --font-body: 'Work Sans', system-ui, sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

    /* -- irama spasi (grid 8px) -- */
    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2rem;
    --space-6: 3rem;
    --space-8: 4rem;
}

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

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

/* Latar ruangan rak buku, di-blur + opasitas rendah supaya cuma jadi
   tekstur suasana di belakang, bukan elemen yang bersaing dengan teks. */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: url('../images/bookshelf-bg.svg') center / cover no-repeat;
    filter: blur(3px) saturate(1);
    opacity: 0.2;
    transform: scale(1.1);
    z-index: -1;
    pointer-events: none;
}

a {
    color: inherit;
}

:focus-visible {
    outline: 2px solid var(--stamp);
    outline-offset: 3px;
}

/* ---------- topbar ---------- */

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 7%;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--forest-deep);
    font-size: 0.95rem;
    text-transform: uppercase;
}

.topbar__brand i {
    width: 20px;
    height: 20px;
    color: var(--forest);
}

.topbar__admin {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--ink-soft);
    padding: 8px 14px;
    border: 1px solid var(--line);
    transition: border-color 0.2s ease, color 0.2s ease;
}

.topbar__admin:hover {
    border-color: var(--forest);
    color: var(--forest-deep);
}

/* ---------- hero ---------- */

.hero {
    padding: var(--space-8) 7% var(--space-6);
    max-width: 760px;
}

.hero__eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--stamp);
    border: 1px solid currentColor;
    padding: 4px 10px;
    margin-bottom: var(--space-3);
}

.hero__title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2rem, 4.4vw, 3.2rem);
    line-height: 1.12;
    color: var(--forest-deep);
    margin-bottom: var(--space-3);
}

.hero__title em {
    font-style: italic;
    color: var(--forest);
}

.hero__desc {
    font-size: 1.02rem;
    font-weight: 500;
    color: var(--ink-soft);
    max-width: 52ch;
    margin-bottom: var(--space-3);
}

.hero__link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--forest-deep);
    border-bottom: 1px solid var(--forest-deep);
    padding-bottom: 3px;
    transition: gap 0.2s ease, color 0.2s ease;
}

.hero__link:hover {
    gap: 12px;
    color: var(--stamp);
    border-color: var(--stamp);
}

/* ---------- filter bar ---------- */

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: 0 7% var(--space-4);
    border-bottom: 1px solid var(--line-soft);
}

.filter-tab {
    position: relative;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--ink-soft);
    padding-bottom: 6px;
}

.filter-tab::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: var(--stamp);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.2s ease;
}

.filter-tab:hover {
    color: var(--ink);
}

.filter-tab:hover::after {
    transform: scaleX(1);
}

.filter-tab.is-active {
    color: var(--forest-deep);
}

.filter-tab.is-active::after {
    transform: scaleX(1);
    background: var(--forest-deep);
}

/* ---------- catalog / shelves ---------- */

.catalog {
    padding: var(--space-6) 7% var(--space-8);
    background-image: repeating-linear-gradient(90deg, rgba(27, 58, 44, 0.025) 0 1px, transparent 1px 64px);
}

.shelf {
    margin-bottom: var(--space-8);
}

.shelf__header {
    display: flex;
    align-items: baseline;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.shelf__title {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--forest-deep);
    white-space: nowrap;
}

.shelf__rule {
    flex: 1;
    height: 1px;
    background: var(--line);
}

.shelf__count {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.72rem;
    color: var(--ink-soft);
    white-space: nowrap;
}

/* ---------- rak: pembungkus + tombol gulir (DESKTOP SAJA) ---------- */

.shelf__row-wrap {
    position: relative;
}

.shelf__nav {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    padding: 0;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 50%;
    background: var(--label-bg);
    color: var(--forest-deep);
    font-family: var(--font-mono);
    font-size: 1.15rem;
    line-height: 1;
    box-shadow: 0 3px 6px rgba(20, 20, 15, 0.25);
    cursor: pointer;
    z-index: 5;
    -webkit-appearance: none;
    appearance: none;
    transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.shelf__nav:hover {
    background: var(--forest-deep);
    color: var(--cover-ink);
}

.shelf__nav:active {
    transform: translateY(-50%) scale(0.94);
}

.shelf__nav--prev {
    left: -15px;
}

.shelf__nav--next {
    right: -15px;
}

/* Panah gulir hanya untuk web/desktop — di layar sentuh, geser jari
   sudah cukup dan tombol ini cuma jadi elemen tambahan yang mengganggu. */
@media (max-width: 768px), (pointer: coarse) {
    .shelf__nav {
        display: none;
    }
}

.shelf__row {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    overflow-x: auto;
    overflow-y: visible;
    position: relative;
    padding: var(--space-4) 4px 26px;
    scroll-snap-type: x proximity;
    mask-image: linear-gradient(to right, black calc(100% - 0px), black 100%);
}

.shelf__row.has-more {
    mask-image: linear-gradient(to right, black calc(100% - 48px), transparent 100%);
}

.shelf__row::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 10px;
    height: 14px;
    background: linear-gradient(180deg, var(--wood-light), var(--wood) 45%, var(--wood-deep));
    box-shadow: 0 8px 12px rgba(30, 20, 10, 0.28);
}

.shelf__row::-webkit-scrollbar {
    height: 4px;
}

.shelf__row::-webkit-scrollbar-thumb {
    background: var(--line);
}

.shelf__row::-webkit-scrollbar-track {
    background: transparent;
}

/* ---------- book card (signature element: closed book on a shelf) ---------- */

.card {
    scroll-snap-align: start;
    position: relative;
    width: 210px;
    min-width: 210px;
    height: 300px;
    padding: 26px 20px 16px 30px;
    display: flex;
    flex-direction: column;
    color: var(--cover-ink);
    border-radius: 2px 8px 8px 2px;
    box-shadow: 3px 6px 10px rgba(20, 20, 15, 0.28);
    transform: rotate(var(--tilt, 0deg));
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 5%;
    bottom: 5%;
    width: 2px;
    background: rgba(0, 0, 0, 0.22);
    box-shadow: -1px 0 0 rgba(255, 255, 255, 0.12);
}

.card::after {
    content: '';
    position: absolute;
    right: 0;
    top: 3%;
    bottom: 3%;
    width: 7px;
    background: repeating-linear-gradient(to bottom, var(--page-edge) 0 3px, var(--page-edge-deep) 3px 4px);
    border-radius: 0 3px 3px 0;
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, 0.15);
}

.card:hover {
    transform: rotate(var(--tilt, 0deg)) translateY(-10px);
    box-shadow: 6px 18px 22px rgba(20, 20, 15, 0.35);
}

.shelf__row .card:nth-child(6n+1) { --tilt: -1.4deg; height: 300px; }
.shelf__row .card:nth-child(6n+2) { --tilt: 0.8deg;  height: 322px; }
.shelf__row .card:nth-child(6n+3) { --tilt: 0deg;    height: 278px; width: 226px; min-width: 226px; }
.shelf__row .card:nth-child(6n+4) { --tilt: -0.9deg; height: 308px; }
.shelf__row .card:nth-child(6n+5) { --tilt: 1.2deg;  height: 292px; }
.shelf__row .card:nth-child(6n+6) { --tilt: -0.5deg; height: 316px; width: 240px; min-width: 240px; }

.cover-1 { background: linear-gradient(160deg, #2f5d45, #1f4433); }
.cover-2 { background: linear-gradient(160deg, #7a2e2e, #5c2222); }
.cover-3 { background: linear-gradient(160deg, #26415c, #1c3348); }
.cover-4 { background: linear-gradient(160deg, #8a6d1f, #6a5517); }
.cover-5 { background: linear-gradient(160deg, #4b2e52, #382140); }
.cover-6 { background: linear-gradient(160deg, #2c5457, #1f4042); }

.card__label {
    align-self: flex-start;
    background: var(--label-bg);
    color: var(--label-ink);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    padding: 3px 9px;
    border: 1px solid rgba(0, 0, 0, 0.15);
    box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    transform: rotate(-2deg);
    margin-bottom: var(--space-2);
}

.card__title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    line-height: 1.32;
    color: var(--cover-ink);
    text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
    margin-bottom: var(--space-1);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card__desc {
    font-size: 0.78rem;
    color: var(--cover-ink-soft);
    flex-grow: 1;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.card__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: auto;
    padding-top: var(--space-1);
    border-top: 1px dashed rgba(247, 241, 228, 0.3);
}

.card__action {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--cover-ink-soft);
    transition: color 0.15s ease;
}

.card__action--download {
    margin-left: auto;
}

.card__action:hover {
    color: var(--cover-ink);
    text-decoration: underline;
}

/* ---------- empty state ---------- */

.empty-state {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--ink-soft);
    padding: var(--space-4) 0;
}

/* ---------- footer ---------- */

.site-footer {
    background: var(--forest-deep);
    color: var(--bg);
    text-align: center;
    padding: var(--space-4) 7%;
}

.site-footer__brand {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: var(--space-1);
}

.site-footer__meta {
    font-size: 0.75rem;
    opacity: 0.85;
}

/* ---------- responsive ---------- */

@media (max-width: 768px) {
    .topbar,
    .hero,
    .filter-bar,
    .catalog,
    .site-footer {
        padding-left: 5%;
        padding-right: 5%;
    }

    .shelf__row .card,
    .card {
        width: 168px;
        min-width: 168px;
    }
}

/* ---------- motion preference ---------- */

@media (prefers-reduced-motion: reduce) {
    .card,
    .filter-tab::after,
    .hero__link {
        transition: none;
    }
}