/* assets/style.css
   Lokasi: /app-collection/serialetik/assets/style.css
   (Pada server ini, path lengkapnya: /root/app-collection/serialetik/assets/style.css)
   Desain: "Perpustakaan Rujukan" — katalog jilid digital untuk seri etik kesehatan.
   Dipakai oleh dashboard.php, viewer.php, dan diag.php. Tidak memengaruhi isi
   buku0.html..buku4.html yang membawa styling sendiri. */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&family=Inter:wght@400;500;600;700&display=swap');

:root {
    --ink-night: #0F1F3D;      /* latar gelap utama */
    --ink-navy: #1F3864;       /* navy inti, dari cover buku */
    --gilt: #C9A668;           /* emas/perunggu muted — aksen emboss */
    --gilt-bright: #E0C28A;
    --paper: #F5F1E8;          /* kertas gading */
    --paper-warm: #EFE8D8;
    --text-dark: #211F26;
    --text-soft: #5B5A63;
    --line-gilt: rgba(201, 166, 104, 0.35);
    --shadow-deep: 0 18px 40px -12px rgba(15, 31, 61, 0.45);
    --shadow-soft: 0 10px 24px -8px rgba(15, 31, 61, 0.18);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', "Segoe UI", Arial, sans-serif;
    background: var(--paper);
    color: var(--text-dark);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: 'Source Serif 4', Georgia, serif; }

a { color: inherit; }

/* ===================== HERO / HEADER ===================== */
.site-header {
    position: relative;
    background: radial-gradient(ellipse 1200px 600px at 50% -10%, #1a3461 0%, var(--ink-night) 55%, #060d1c 100%);
    color: var(--paper);
    padding: 72px 24px 88px;
    text-align: center;
    overflow: hidden;
    border-bottom: 1px solid var(--line-gilt);
}

.site-header::before,
.site-header::after {
    content: "";
    position: absolute;
    border: 1px solid var(--line-gilt);
    opacity: 0.5;
    pointer-events: none;
}
.site-header::before {
    inset: 18px;
    border-width: 1px;
}
.site-header::after {
    left: 50%; top: 0; bottom: 0; width: 1px;
    background: linear-gradient(to bottom, transparent, var(--line-gilt) 20%, var(--line-gilt) 80%, transparent);
    border: none;
    display: none; /* garis tengah dimatikan default, terlalu ramai di mobile; aktif lewat media query desktop jika perlu */
}

.site-header .eyebrow {
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.74rem;
    color: var(--gilt-bright);
    margin-bottom: 18px;
    font-weight: 600;
    position: relative;
    z-index: 2;
}

.site-header .eyebrow::before,
.site-header .eyebrow::after {
    content: "—";
    margin: 0 10px;
    opacity: 0.6;
}

.site-header h1 {
    margin: 0 0 16px;
    font-size: clamp(2.1rem, 5vw, 3.4rem);
    font-weight: 700;
    letter-spacing: 0.2px;
    position: relative;
    z-index: 2;
    text-shadow: 0 2px 24px rgba(0,0,0,0.3);
}

.site-header p.subtitle {
    margin: 0 auto;
    max-width: 660px;
    color: #C9D3E6;
    font-size: 1.08rem;
    font-style: italic;
    font-family: 'Source Serif 4', Georgia, serif;
    position: relative;
    z-index: 2;
}

.site-header .author-line {
    margin-top: 30px;
    font-size: 0.88rem;
    color: #9BAACA;
    position: relative;
    z-index: 2;
    letter-spacing: 0.2px;
}

.site-header .author-line strong {
    color: var(--gilt-bright);
    font-weight: 600;
}

.site-header .divider-rule {
    width: 64px;
    height: 2px;
    background: var(--gilt);
    margin: 26px auto;
    position: relative;
    z-index: 2;
    opacity: 0.85;
}

/* ===================== CONTAINER / INTRO ===================== */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

.intro-text {
    max-width: 720px;
    margin: 44px auto 8px;
    text-align: center;
    color: var(--text-soft);
    font-size: 1rem;
}

.intro-text strong { color: var(--ink-navy); }

/* ===================== GRID KATALOG (KARTU BUKU) ===================== */
.book-grid {
    display: flex;
    flex-wrap: wrap;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 26px;
    margin: 40px auto 64px;
    max-width: 1120px;
    padding: 0 24px;
}

.book-grid .book-card {
    flex: 1 1 320px; /* dipakai jika browser hanya mendukung flexbox, diabaikan jika grid aktif */
}

@media (min-width: 700px) {
    .book-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
    .book-grid { grid-template-columns: repeat(3, 1fr); }
}

.book-card {
    --accent: var(--ink-navy);
    position: relative;
    display: flex;
    flex-direction: column;
    background: #fff;
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-dark);
    padding: 30px 26px 26px;
    box-shadow: var(--shadow-soft);
    border: 1px solid #E4DECB;
    border-top: 3px solid var(--accent);
    transition: transform 0.22s cubic-bezier(.2,.8,.2,1), box-shadow 0.22s ease;
    overflow: hidden;
}

.book-card::before {
    /* tekstur halus garis vertikal ala jilid buku di tepi kiri */
    content: "";
    position: absolute;
    left: 0; top: 0; bottom: 0; width: 5px;
    background: repeating-linear-gradient(
        to bottom, var(--accent) 0px, var(--accent) 2px, transparent 2px, transparent 5px
    );
    opacity: 0.35;
}

.book-card:hover,
.book-card:focus-visible {
    transform: translateY(-6px);
    box-shadow: var(--shadow-deep);
}

.book-card .vol-no {
    position: absolute;
    top: 14px;
    right: 18px;
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.10;
    line-height: 1;
    user-select: none;
    z-index: 0;
    pointer-events: none;
}

.book-card .book-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.4px;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 14px;
    position: relative;
    z-index: 1;
}

.book-card .book-tag::before {
    content: "";
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    display: inline-block;
}

.book-card .vol-label {
    font-size: 0.74rem;
    color: var(--text-soft);
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.book-card h2 {
    margin: 0 0 6px;
    font-size: 1.32rem;
    line-height: 1.28;
    color: var(--ink-night);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.book-card h3 {
    margin: 0 0 14px;
    font-size: 0.92rem;
    font-weight: 400;
    font-style: italic;
    color: var(--text-soft);
}

.book-card p.desc {
    margin: 0;
    font-size: 0.91rem;
    color: #45444c;
    flex-grow: 1;
    font-family: 'Inter', sans-serif;
}

.book-card .read-more {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid #ECE6D5;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.book-card .read-more .arrow {
    transition: transform 0.2s ease;
    font-size: 1.05rem;
}

.book-card:hover .read-more .arrow {
    transform: translateX(4px);
}

/* ===================== SECTION DIVIDER (pemisah grup naskah) ===================== */
.section-divider {
    display: flex;
    align-items: center;
    gap: 18px;
    margin: 24px 0 18px;
}
.section-divider::before,
.section-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--gilt) 50%, transparent);
}
.section-divider span {
    font-family: 'Source Serif 4', Georgia, serif;
    font-style: italic;
    font-size: 1.05rem;
    color: var(--ink-navy);
    white-space: nowrap;
}

/* ===================== DOC CARD (naskah pelengkap / kode etik) ===================== */
.doc-grid {
    margin-top: 18px;
}
.book-card.doc-card {
    border-top-style: dashed;
    border-top-width: 3px;
}
.book-card.doc-card::before {
    background: repeating-linear-gradient(
        to bottom, var(--accent) 0px, var(--accent) 3px, transparent 3px, transparent 7px
    );
    opacity: 0.5;
}
.doc-badge {
    display: inline-block;
    align-self: flex-start;
    background: var(--accent);
    color: #fff;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 12px;
    border-radius: 3px;
    margin-bottom: 14px;
    position: relative;
    z-index: 1;
}

/* ===================== FOOTER ===================== */
.site-footer {
    text-align: center;
    padding: 40px 24px 48px;
    color: var(--text-soft);
    font-size: 0.84rem;
    border-top: 1px solid #E4DECB;
    background: var(--paper-warm);
}

.site-footer .pub-name {
    color: var(--ink-night);
    font-weight: 700;
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1.02rem;
    margin-bottom: 2px;
}

.site-footer .pub-seal {
    display: inline-block;
    width: 38px; height: 38px;
    border: 1.5px solid var(--gilt);
    border-radius: 50%;
    margin-bottom: 14px;
    position: relative;
}
.site-footer .pub-seal::after {
    content: "✦";
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    color: var(--gilt);
    font-size: 1rem;
}

/* ===================== VIEWER PAGE ===================== */
.viewer-bar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--ink-night);
    color: var(--paper);
    padding: 14px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    border-bottom: 2px solid var(--gilt);
}

.viewer-bar .back-link {
    color: var(--paper);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 14px;
    border: 1px solid rgba(201,166,104,0.5);
    border-radius: 3px;
    transition: background 0.15s ease;
}

.viewer-bar .back-link:hover { background: rgba(201,166,104,0.15); }

.viewer-bar .viewer-title {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1rem;
    font-weight: 600;
    text-align: right;
    color: var(--gilt-bright);
}

.viewer-frame-wrap {
    width: 100%;
    height: calc(100vh - 60px);
    background: #fff;
}

.viewer-frame-wrap iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}

/* ===================== ERROR / EMPTY STATE ===================== */
.error-box {
    max-width: 640px;
    margin: 70px auto;
    text-align: center;
    padding: 40px 32px;
    background: #fff;
    border: 1px solid #E4DECB;
    border-top: 4px solid var(--ink-navy);
    border-radius: 4px;
    box-shadow: var(--shadow-soft);
}

.error-box h1 {
    color: var(--ink-navy);
    font-size: 1.5rem;
    margin-top: 0;
}

.error-box code {
    background: var(--paper-warm);
    padding: 2px 7px;
    border-radius: 3px;
    font-size: 0.88em;
}

.error-box a {
    color: var(--ink-navy);
    font-weight: 700;
    text-decoration: none;
}

.error-box a:hover { text-decoration: underline; }

@media (max-width: 600px) {
    .site-header { padding: 52px 18px 64px; }
    .site-header .divider-rule { margin: 22px auto; }
    .viewer-bar { flex-direction: column; align-items: flex-start; }
    .viewer-bar .viewer-title { text-align: left; }
    .book-card .vol-no { font-size: 2.6rem; }
}

@media (prefers-reduced-motion: reduce) {
    .book-card, .book-card .read-more .arrow { transition: none; }
}