/* ========== CSS VARIABLES LIGHT & DARK ========== */
:root {
    --merah: #e63946;
    --kuning: #ffd166;
    --hijau: #2a9d8f;
    --biru: #1d3557;
    --biru-muda: #a8dadc;
    --abu-soft: #f8f6f0;
    --teks: #2d3e4e;
    --bg-body: #fcfaf7;
    --card-bg: #ffffff;
    --navbar-bg: rgba(255,255,255,0.92);
    --footer-bg: var(--biru);
    --border-color: #f0ebe3;
    --shadow: 0 8px 30px rgba(0,0,0,0.04);
    --shadow-hover: 0 20px 40px rgba(0,0,0,0.08);
    --synopsis-color: #4a5a6a;
    --hero-text: white;
    --hero-gradient: linear-gradient(135deg, var(--biru) 0%, var(--biru-muda) 100%);
    --detail-bg: var(--card-bg);
    --meta-color: #6c7a8a;
    --divider-color: #e9e3db;
}

/* Hero / Breadcrumb sederhana */
.hero-detail {
    background: var(--hero-gradient);
    color: var(--hero-text);
    padding: 6rem 0 2.5rem;
    margin-top: 76px;
    border-radius: 0 0 3rem 3rem;
    transition: background 0.3s, color 0.3s;
}
.hero-detail .breadcrumb-custom {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}
.hero-detail .breadcrumb-custom a {
    color: var(--hero-text);
    text-decoration: none;
    opacity: 0.7;
    transition: 0.2s;
}
.hero-detail .breadcrumb-custom a:hover {
    opacity: 1;
}
.hero-detail .breadcrumb-custom .separator {
    opacity: 0.4;
}

/* Detail Content */
.detail-section {
    padding: 2.5rem 0 3rem;
}
.detail-card {
    background: var(--detail-bg);
    border-radius: 2rem;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: background 0.3s, box-shadow 0.3s, border 0.3s;
}
.detail-cover {
    max-width: 100%;
    height: auto;
    aspect-ratio: 3/4;
    object-fit: cover;
    border-radius: 1.5rem;
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
    transition: box-shadow 0.3s;
}
.detail-body {
    padding: 1.5rem 2rem 2rem;
}
.detail-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--biru);
    margin-bottom: 0.3rem;
    transition: color 0.3s;
}
.detail-author {
    font-size: 1.1rem;
    color: var(--meta-color);
    margin-bottom: 1.2rem;
}
.detail-author i {
    color: var(--hijau);
}
.detail-badge {
    display: inline-block;
    padding: 0.3rem 1rem;
    border-radius: 40px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--biru-muda);
    color: var(--biru);
    margin-bottom: 1.2rem;
    transition: background 0.3s, color 0.3s;
}
.detail-price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--hijau);
    margin: 1rem 0 1.2rem;
    transition: color 0.3s;
}
.detail-synopsis {
    height: 30rem;
    overflow: scroll;
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--synopsis-color);
    margin-bottom: 1.5rem;
    transition: color 0.3s;
}
.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1rem 0;
    border-top: 1px solid var(--divider-color);
    border-bottom: 1px solid var(--divider-color);
    margin: 1.2rem 0 1.5rem;
    transition: border 0.3s;
}
.detail-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--meta-color);
}
.detail-meta-item i {
    color: var(--hijau);
    font-size: 1.1rem;
}
.detail-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 1.5rem;
}

.btn-cart {
    background: var(--hijau);
    color: white;
    border: none;
    padding: 0.8rem 2.5rem;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.btn-edit {
    background: var(--biru);
    color: white;
    border: none;
    padding: 0.8rem 2.5rem;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.btn-delete {
    background: var(--merah);
    color: white;
    border: none;
    cursor: pointer;
    padding: 0.8rem 2.5rem;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.btn-buy-lg {
    background: var(--hijau);
    color: white;
    border: none;
    padding: 0.8rem 2.5rem;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}
.btn-buy-lg:hover {
    background: #21867a;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(42,157,143,0.3);
    color: white;
}
.btn-back {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--teks);
    padding: 0.8rem 2rem;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.btn-back:hover {
    border-color: var(--biru);
    background: rgba(29,53,87,0.04);
    color: var(--teks);
}

/* Info tambahan */
.info-box {
    background: var(--abu-soft);
    border-radius: 1.2rem;
    padding: 1.2rem 1.5rem;
    margin-top: 1.5rem;
    border-left: 5px solid var(--kuning);
    transition: background 0.3s, border 0.3s;
}
.info-box i {
    color: var(--hijau);
}

/* loading saat simpan buku */
.spinner-loader-delete-book {
    display: none;
    flex-shrink: 0;
    width: var(--bs-spinner-width);
    height: var(--bs-spinner-height);
    vertical-align: var(--bs-spinner-vertical-align);
    border-radius: 50%;
    animation: var(--bs-spinner-animation-speed) linear infinite var(--bs-spinner-animation-name);
}

.spinner-border-delete-book {
    --bs-spinner-width: 1.2rem;
    --bs-spinner-height: 1.2rem;
    --bs-spinner-vertical-align: -0.125em;
    --bs-spinner-border-width: 0.2em;
    --bs-spinner-animation-speed: 0.75s;
    --bs-spinner-animation-name: spinner-border;
    border: var(--bs-spinner-border-width) solid currentcolor;
    border-right-color: transparent;
}

/* Animasi */
@keyframes gentleFade {
    0% { opacity: 0; transform: translateY(18px); }
    100% { opacity: 1; transform: translateY(0); }
}
.fade-up {
    animation: gentleFade 0.5s ease forwards;
}
.delay-1 { animation-delay: 0.05s; opacity: 0; }
.delay-2 { animation-delay: 0.1s; opacity: 0; }

/* Responsif */
@media (max-width: 768px) {
    .hero-detail { padding: 5rem 0 1.8rem; }
    .detail-title { font-size: 1.8rem; }
    .detail-body { padding: 1.2rem 1.2rem 1.5rem; }
    .detail-price { font-size: 1.6rem; }
    .detail-cover { aspect-ratio: 4/5; }
    .darkmode-switch span { display: none; }
    .darkmode-switch { padding: 0.4rem; }
}
@media (max-width: 576px) {
    .detail-title { font-size: 1.5rem; }
    .detail-synopsis { font-size: 0.95rem; }
    .detail-actions { flex-direction: column; }
    .btn-buy-lg, .btn-back, .btn-cart, .btn-delete { width: 100%; justify-content: center; }
    .detail-meta { flex-direction: column; gap: 0.8rem; }
}