:root {
    --sbd-blue: #001c54;
    --sbd-blue-dark: #000a1d;
    --sbd-slate: #464749;
    --sbd-muted: #6c757d;
    --sbd-border: #ced4da;
    --sbd-bg: #f1f3f2;
    --sbd-soft-blue: #eef3f8;
    --sbd-accent: #3bb98c;
    --sbd-accent-strong: #51d8a8;
    --sbd-red: #ed1c24;
    --sbd-green: var(--sbd-blue);
    --sbd-green-dark: var(--sbd-blue-dark);
    --sbd-green-soft: var(--sbd-soft-blue);
    --sbd-gold: var(--sbd-accent);
    --sbd-text: #242424;
    --sbd-white: #ffffff;
    --sbd-shadow: 0 14px 32px rgba(0, 28, 84, 0.12);
    --sbd-font: Montserrat, var(--bs-body-font-family, system-ui, -apple-system, "Segoe UI", Arial, sans-serif);
}

.sbd-page-wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 34px 18px 54px;
}

.sbd-library,
.sbd-reader,
.sbd-description {
    font-family: var(--sbd-font);
    color: var(--sbd-text);
}

.sbd-library-hero {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 22px;
    padding: 26px 28px;
    border-radius: 8px;
    border-top: 5px solid var(--sbd-red);
    background: linear-gradient(135deg, var(--sbd-blue-dark), var(--sbd-blue));
    color: var(--sbd-white);
    box-shadow: var(--sbd-shadow);
    margin-bottom: 28px;
    position: relative;
    overflow: hidden;
}

.sbd-library-hero::after {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    width: 38%;
    height: 5px;
    background: var(--sbd-accent);
}

.sbd-library-hero h2,
.sbd-reader-header h2 {
    margin: 4px 0 8px;
    font-size: clamp(30px, 4vw, 42px);
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: 0;
}

.sbd-library-hero p {
    max-width: 720px;
    margin: 0;
    color: rgba(255, 255, 255, 0.88);
    font-size: 16px;
    line-height: 1.55;
}

.sbd-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
    font-size: 12px;
    color: var(--sbd-accent-strong);
}

.sbd-kicker::before {
    content: '';
    width: 28px;
    height: 3px;
    border-radius: 0;
    background: currentColor;
}

.sbd-search-label {
    position: relative;
    z-index: 2;
    flex: 0 0 310px;
}

.sbd-search {
    width: 100%;
    border: 1px solid rgba(255,255,255,.32) !important;
    border-radius: 8px !important;
    padding: 13px 18px !important;
    background: rgba(255,255,255,.96) !important;
    color: var(--sbd-text) !important;
    outline: none;
}

.sbd-grid {
    display: grid;
    gap: 24px;
}

.sbd-cols-1 .sbd-grid { grid-template-columns: 1fr; }
.sbd-cols-2 .sbd-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.sbd-cols-3 .sbd-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.sbd-cols-4 .sbd-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.sbd-card {
    background: var(--sbd-white);
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 18px rgba(0,0,0,.08);
    transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.sbd-card:hover {
    transform: translateY(-3px);
    border-color: rgba(0,28,84,.3);
    box-shadow: 0 12px 30px rgba(0,0,0,.13);
}

.sbd-cover {
    display: block;
    aspect-ratio: 3 / 4;
    background: linear-gradient(150deg, #e9edf2, #ffffff);
    overflow: hidden;
}

.sbd-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .3s ease;
}

.sbd-card:hover .sbd-cover img {
    transform: scale(1.035);
}

.sbd-cover-placeholder {
    height: 100%;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--sbd-blue-dark), var(--sbd-blue));
    color: var(--sbd-white);
}

.sbd-cover-placeholder span {
    border: 1px solid rgba(255,255,255,.58);
    padding: 14px 18px;
    border-radius: 4px;
    font-weight: 700;
    letter-spacing: 0;
}

.sbd-card-body {
    padding: 18px;
}

.sbd-badge {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 4px;
    background: var(--sbd-soft-blue);
    color: var(--sbd-blue);
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.sbd-card h3 {
    margin: 0 0 10px;
    font-size: 19px;
    line-height: 1.25;
    font-weight: 700;
}

.sbd-card h3 a {
    color: var(--sbd-text);
    text-decoration: none;
}

.sbd-card h3 a:hover {
    color: var(--sbd-blue);
}

.sbd-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    margin: 0 0 8px;
    color: var(--sbd-muted);
    font-size: 14px;
}

.sbd-meta span:not(:last-child)::after {
    content: '•';
    margin-left: 12px;
    color: #a2b2ac;
}

.sbd-area {
    margin: 0 0 16px;
    color: var(--sbd-muted);
    font-size: 14px;
}

.sbd-card-actions,
.sbd-reader-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.sbd-button,
.sbd-outline-button,
.sbd-link-button {
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    font-weight: 700;
    text-decoration: none !important;
    transition: transform .2s ease, background .2s ease, border-color .2s ease;
}

.sbd-button {
    background: var(--sbd-blue);
    color: var(--sbd-white) !important;
}

.sbd-button:hover,
.sbd-outline-button:hover,
.sbd-link-button:hover {
    transform: translateY(-1px);
}

.sbd-button:hover {
    background: var(--sbd-blue-dark);
}

.sbd-outline-button {
    background: var(--sbd-white);
    color: var(--sbd-blue) !important;
    border-color: var(--sbd-border);
}

.sbd-link-button {
    background: transparent;
    color: var(--sbd-blue);
    padding-left: 0;
    padding-right: 0;
}

.sbd-reader {
    background: var(--sbd-bg);
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    padding: 22px;
    box-shadow: var(--sbd-shadow);
}

.sbd-reader-header {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: flex-end;
    padding: 14px 8px 22px;
}

.sbd-reader-header h2 {
    color: var(--sbd-blue);
    font-size: clamp(24px, 3vw, 36px);
}

.sbd-viewer-shell {
    background: linear-gradient(135deg, #f1f3f2, #ffffff);
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    padding: 18px;
}

.sbd-flowpaper {
    background: #f1f3f2;
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    overflow: hidden;
}

.sbd-flowpaper [hidden] {
    display: none !important;
}

.sbd-flow-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px;
    background: #ffffff;
    border-bottom: 1px solid var(--sbd-border);
    border-top: 4px solid var(--sbd-blue);
}

.sbd-flow-toolbar-group {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.sbd-reader-icon-button,
.sbd-reader-tool-button {
    appearance: none;
    border: 1px solid var(--sbd-border);
    background: #ffffff;
    color: var(--sbd-blue);
    cursor: pointer;
    font-weight: 700;
    transition: background .2s ease, border-color .2s ease, transform .2s ease, opacity .2s ease;
}

.sbd-reader-icon-button {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    padding: 0;
    font-size: 24px;
    line-height: 1;
}

.sbd-reader-tool-button {
    min-height: 40px;
    border-radius: 8px;
    padding: 0 12px;
    font-size: 13px;
}

.sbd-reader-icon-button:hover,
.sbd-reader-tool-button:hover {
    border-color: rgba(0,28,84,.38);
    background: var(--sbd-soft-blue);
    transform: translateY(-1px);
}

.sbd-reader-icon-button:disabled,
.sbd-reader-tool-button:disabled {
    cursor: not-allowed;
    opacity: .42;
    transform: none;
}

.sbd-page-control {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 40px;
    padding: 0 10px;
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    background: #f8f9fa;
    color: var(--sbd-muted);
    font-size: 13px;
    font-weight: 700;
}

.sbd-page-control input {
    width: 58px;
    min-height: 30px;
    border: 1px solid #cddbd5 !important;
    border-radius: 6px !important;
    padding: 3px 6px !important;
    color: var(--sbd-blue) !important;
    font-weight: 700;
    text-align: center;
}

.sbd-zoom-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 58px;
    min-height: 40px;
    color: var(--sbd-blue);
    font-weight: 700;
    font-size: 13px;
}

.sbd-flow-stage {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 10px;
}

.sbd-thumbs-open .sbd-flow-stage {
    grid-template-columns: 138px minmax(0, 1fr);
}

.sbd-flow-thumbs {
    max-height: min(72vh, 760px);
    overflow: auto;
    padding: 8px;
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    background: #ffffff;
}

.sbd-thumb-button {
    appearance: none;
    display: grid;
    gap: 6px;
    width: 100%;
    margin: 0 0 8px;
    padding: 7px;
    border: 1px solid #dbe7e1;
    border-radius: 8px;
    background: #f8f9fa;
    color: var(--sbd-muted);
    cursor: pointer;
    font-size: 12px;
    font-weight: 700;
}

.sbd-thumb-button canvas {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(0,0,0,.12);
}

.sbd-thumb-button.is-active {
    border-color: var(--sbd-accent);
    background: var(--sbd-soft-blue);
    color: var(--sbd-blue);
}

.sbd-flow-pages {
    position: relative;
    display: grid;
    place-items: center;
    min-height: min(72vh, 780px);
    overflow: auto;
    padding: 18px 58px;
    border: 1px solid var(--sbd-border);
    border-radius: 12px;
    background:
        linear-gradient(180deg, rgba(255,255,255,.52), rgba(255,255,255,0)),
        linear-gradient(135deg, #e1e6ec, #f8f9fa 48%, #e7ecef);
}

.sbd-flow-spread {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: min-content;
    max-width: 100%;
    transform-origin: center;
    transition: transform .24s ease, opacity .24s ease;
}

.sbd-flow-spread.is-turning-next {
    animation: sbdTurnNext .26s ease;
}

.sbd-flow-spread.is-turning-prev {
    animation: sbdTurnPrev .26s ease;
}

.sbd-flow-page {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 220px;
    min-height: 320px;
    overflow: auto;
    background: #ffffff;
    border: 1px solid rgba(17, 45, 36, .12);
    border-radius: 4px;
    box-shadow: 0 18px 38px rgba(0, 28, 84, .18);
}

.sbd-flow-page canvas {
    display: block;
    background: #ffffff;
}

.sbd-flow-page.is-loading::after {
    content: '';
    position: absolute;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 3px solid rgba(0,28,84,.14);
    border-top-color: var(--sbd-blue);
    animation: sbdSpin .8s linear infinite;
}

.sbd-flow-spine {
    width: 18px;
    align-self: stretch;
    min-height: 320px;
    background: linear-gradient(90deg, rgba(0,28,84,.22), rgba(255,255,255,.78), rgba(0,28,84,.18));
    box-shadow: inset 0 0 8px rgba(0,0,0,.18);
}

.sbd-flow-spread.is-single-page .sbd-flow-spine {
    display: none;
}

.sbd-flow-page-number {
    position: absolute;
    right: 10px;
    bottom: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    min-height: 24px;
    padding: 0 7px;
    border-radius: 8px;
    background: rgba(255,255,255,.92);
    color: var(--sbd-muted);
    font-size: 12px;
    font-weight: 700;
    box-shadow: 0 2px 10px rgba(0,0,0,.1);
}

.sbd-stage-nav {
    appearance: none;
    position: absolute;
    z-index: 2;
    top: 50%;
    width: 42px;
    height: 56px;
    margin-top: -28px;
    border: 1px solid rgba(0,28,84,.18);
    border-radius: 8px;
    background: rgba(255,255,255,.92);
    color: var(--sbd-blue);
    cursor: pointer;
    font-size: 36px;
    line-height: 1;
    box-shadow: 0 8px 22px rgba(0,0,0,.12);
}

.sbd-stage-nav:hover {
    background: #ffffff;
    border-color: rgba(0,28,84,.42);
}

.sbd-stage-nav:disabled {
    cursor: not-allowed;
    opacity: .28;
}

.sbd-stage-nav-prev {
    left: 10px;
}

.sbd-stage-nav-next {
    right: 10px;
}

.sbd-flow-status {
    margin: 0;
    padding: 10px 14px 14px;
    color: var(--sbd-muted);
    font-size: 13px;
    font-weight: 700;
}

.sbd-flow-status.is-error {
    color: #8a4b00;
}

.sbd-native-fallback {
    padding: 10px;
}

.sbd-reader:fullscreen {
    width: 100%;
    height: 100%;
    overflow: auto;
    border-radius: 0;
}

.sbd-reader:fullscreen .sbd-flow-pages {
    min-height: calc(100vh - 220px);
}

@keyframes sbdTurnNext {
    0% { transform: perspective(1000px) rotateY(0deg) translateX(0); opacity: 1; }
    50% { transform: perspective(1000px) rotateY(-4deg) translateX(-8px); opacity: .86; }
    100% { transform: perspective(1000px) rotateY(0deg) translateX(0); opacity: 1; }
}

@keyframes sbdTurnPrev {
    0% { transform: perspective(1000px) rotateY(0deg) translateX(0); opacity: 1; }
    50% { transform: perspective(1000px) rotateY(4deg) translateX(8px); opacity: .86; }
    100% { transform: perspective(1000px) rotateY(0deg) translateX(0); opacity: 1; }
}

@keyframes sbdSpin {
    to { transform: rotate(360deg); }
}

.sbd-book-frame {
    position: relative;
    height: min(76vh, 860px);
    min-height: 560px;
    overflow: hidden;
    border-radius: 16px;
    background: #101814;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.12), 0 16px 36px rgba(0,0,0,.16);
}

.sbd-book-frame iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
    background: #fff;
}

.sbd-reader-note {
    margin: 12px 8px 0;
    color: var(--sbd-muted);
    font-size: 13px;
}

.sbd-empty {
    border: 1px dashed var(--sbd-border);
    border-radius: 8px;
    background: var(--sbd-white);
    padding: 24px;
    color: var(--sbd-muted);
}

.sbd-empty strong {
    display: block;
    color: var(--sbd-text);
    margin-bottom: 8px;
}

.sbd-description {
    margin-top: 24px;
    background: #fff;
    border: 1px solid var(--sbd-border);
    border-radius: 8px;
    padding: 24px;
}

.sbd-description h2 {
    color: var(--sbd-blue);
    margin-top: 0;
    font-family: var(--sbd-font);
    font-weight: 700;
}

.sbd-overlay-open {
    overflow: hidden;
}

.sbd-overlay {
    position: fixed;
    inset: 0;
    z-index: 999999;
    display: grid;
    place-items: center;
    padding: 20px;
}

.sbd-overlay-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 10, 29, .76);
    backdrop-filter: blur(4px);
}

.sbd-overlay-panel {
    position: relative;
    width: min(1180px, 96vw);
    max-height: 94vh;
    overflow: auto;
    border-radius: 8px;
}

.sbd-overlay-close {
    position: absolute;
    right: 16px;
    top: 14px;
    z-index: 3;
    width: 42px;
    height: 42px;
    border: 0;
    border-radius: 8px;
    background: var(--sbd-blue);
    color: #fff;
    font-size: 30px;
    line-height: 1;
    cursor: pointer;
}

.sbd-reader-compact .sbd-book-frame {
    height: 76vh;
}

@media (max-width: 980px) {
    .sbd-cols-3 .sbd-grid,
    .sbd-cols-4 .sbd-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

    .sbd-library-hero,
    .sbd-reader-header {
        flex-direction: column;
        align-items: stretch;
    }

    .sbd-search-label {
        flex: 1 1 auto;
    }

    .sbd-thumbs-open .sbd-flow-stage {
        grid-template-columns: 1fr;
    }

    .sbd-flow-thumbs {
        display: flex;
        gap: 8px;
        max-height: none;
        overflow-x: auto;
        overflow-y: hidden;
    }

    .sbd-thumb-button {
        flex: 0 0 92px;
        margin: 0;
    }
}

@media (max-width: 620px) {
    .sbd-page-wrap { padding: 18px 12px 36px; }
    .sbd-cols-2 .sbd-grid,
    .sbd-cols-3 .sbd-grid,
    .sbd-cols-4 .sbd-grid { grid-template-columns: 1fr; }
    .sbd-library-hero,
    .sbd-reader { border-radius: 8px; padding: 18px; }
    .sbd-flow-toolbar {
        justify-content: center;
    }
    .sbd-reader-tool-button {
        padding: 0 9px;
    }
    .sbd-reader-icon-button {
        width: 38px;
        height: 38px;
    }
    .sbd-page-control {
        padding: 0 7px;
    }
    .sbd-page-control input {
        width: 50px;
    }
    .sbd-flow-stage {
        padding: 8px;
    }
    .sbd-flow-pages {
        min-height: 62vh;
        padding: 12px 44px;
    }
    .sbd-flow-page {
        min-width: 190px;
        min-height: 280px;
    }
    .sbd-stage-nav {
        width: 34px;
        height: 48px;
        font-size: 30px;
    }
    .sbd-book-frame { min-height: 440px; height: 68vh; }
    .sbd-viewer-shell { padding: 10px; border-radius: 16px; }
}