html {
    scrollbar-gutter: stable;
}

:root {
    /* Define the global font family for the Bookshelf and all its UI elements. 
       We use a modern sans-serif stack that gracefully falls back to the system font, 
       ensuring inputs, search filters, and buttons all share a unified, premium typography. */
    --dd-bs-font-family: "Poppins", "Inter", "Kanit", "Prompt", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    --dd-bs-bg-cream: #f4ede0;
    --dd-bs-bg-warm: #ebe0c9;
    --dd-bs-bg-deep: #d9c9a3;
    --dd-bs-wood-dark: #4a2d18;
    --dd-bs-wood: #8b5a3c;
    --dd-bs-wood-light: #a87444;
    --dd-bs-wood-highlight: #c89466;
    --dd-bs-paper: #faf5e9;
    --dd-bs-paper-shadow: #e8dcc0;
    --dd-bs-ink: #2c2418;
    --dd-bs-ink-soft: #5c4e3a;
    --dd-bs-ink-light: #8a7a5e;
    --dd-bs-accent: #c8973d;
    --dd-bs-accent-dark: #8c6a2b;
    --dd-bs-accent-light: #e0b870;
    --dd-bs-shadow: rgba(60, 40, 20, 0.2);
    --dd-bs-shadow-strong: rgba(60, 40, 20, 0.4);
    --dd-bs-page-width: min(48vw, 760px);
    --dd-bs-page-height: min(88vh, 940px);
    
    --dd-bs-shelf-grad-1: #b67d4e;
    --dd-bs-shelf-grad-2: #8b5a3c;
    --dd-bs-shelf-grad-3: #6b4226;
    --dd-bs-shelf-grad-4: #4a2d18;
    --dd-bs-shelf-edge-1: transparent;
    --dd-bs-shelf-edge-2: rgba(200, 148, 102, 0.6);
    --dd-bs-shelf-edge-3: transparent;

    /* Book cover spine gradient — shown behind the PDF cover image */
    --dd-bs-cover-grad-1: #8b3a22;
    --dd-bs-cover-grad-2: #4a1f10;

    /* Background decoration blob colors (soft glowing orbs) */
    --dd-bs-blob-1: rgba(224, 184, 112, 0.4);
    --dd-bs-blob-2: rgba(200, 148, 102, 0.4);
    
    --dd-bs-glass-bg: rgba(139, 90, 60, 0.08);
    --dd-bs-glass-hover: rgba(139, 90, 60, 0.15);
    --dd-bs-glass-border: rgba(139, 90, 60, 0.15);
    --dd-bs-toolbar-bg: rgba(255, 252, 240, 0.85);
}


/* Minimalist Theme */
[data-dd-bs-theme="minimalist"] {
    --dd-bs-bg-cream: #ffffff;
    --dd-bs-bg-warm: #f8f9fa;
    --dd-bs-bg-deep: #e9ecef;
    --dd-bs-wood-dark: #dee2e6;
    --dd-bs-wood: #ced4da;
    --dd-bs-wood-light: #e9ecef;
    --dd-bs-wood-highlight: #f8f9fa;
    --dd-bs-paper: #ffffff;
    --dd-bs-paper-shadow: #e9ecef;
    --dd-bs-ink: #212529;
    --dd-bs-ink-soft: #495057;
    --dd-bs-ink-light: #6c757d;
    --dd-bs-accent: #adb5bd;
    --dd-bs-accent-dark: #70767b;
    --dd-bs-shadow: rgba(0, 0, 0, 0.05);
    --dd-bs-shadow-strong: rgba(0, 0, 0, 0.1);
    --dd-bs-shelf-grad-1: #f8f9fa;
    --dd-bs-shelf-grad-2: #e9ecef;
    --dd-bs-shelf-grad-3: #dee2e6;
    --dd-bs-shelf-grad-4: #ced4da;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.8);

    --dd-bs-cover-grad-1: #6c757d;
    --dd-bs-cover-grad-2: #343a40;

    --dd-bs-blob-1: rgba(108, 117, 125, 0.3);
    --dd-bs-blob-2: rgba(52, 58, 64, 0.3);
    --dd-bs-glass-bg: rgba(0, 0, 0, 0.04);
    --dd-bs-glass-hover: rgba(0, 0, 0, 0.08);
    --dd-bs-glass-border: rgba(0, 0, 0, 0.08);
    --dd-bs-toolbar-bg: rgba(255, 255, 255, 0.85);
}
[data-dd-bs-theme="minimalist"] body.dd-bookshelf-full-page,
[data-dd-bs-theme="minimalist"] #dd-bookshelf-app {
    background: radial-gradient(ellipse 80% 60% at 50% 0%, #ffffff 0%, #f8f9fa 50%, #e9ecef 100%);
    background-size: cover;
    background-attachment: fixed;
}
[data-dd-bs-theme="minimalist"] .dd-bs-bg-blob { opacity: 0.2; }
[data-dd-bs-theme="minimalist"] .dd-bs-sort-btn.active { color: var(--dd-bs-ink); }

/* Navy Theme */
[data-dd-bs-theme="navy"] {
    --dd-bs-bg-cream: #1e293b;
    --dd-bs-bg-warm: #0f172a;
    --dd-bs-bg-deep: #020617;
    --dd-bs-wood-dark: #0f172a;
    --dd-bs-wood: #1e293b;
    --dd-bs-wood-light: #334155;
    --dd-bs-wood-highlight: #475569;
    --dd-bs-paper: #1e293b;
    --dd-bs-paper-shadow: #0f172a;
    --dd-bs-ink: #f8fafc;
    --dd-bs-ink-soft: #cbd5e1;
    --dd-bs-ink-light: #94a3b8;
    --dd-bs-accent: #38bdf8;
    --dd-bs-accent-dark: #247ba1;
    --dd-bs-shadow: rgba(0, 0, 0, 0.5);
    --dd-bs-shadow-strong: rgba(0, 0, 0, 0.8);
    --dd-bs-shelf-grad-1: #334155;
    --dd-bs-shelf-grad-2: #1e293b;
    --dd-bs-shelf-grad-3: #0f172a;
    --dd-bs-shelf-grad-4: #020617;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.1);

    --dd-bs-cover-grad-1: #1e3a5f;
    --dd-bs-cover-grad-2: #0c1e35;

    --dd-bs-blob-1: rgba(56, 189, 248, 0.15);
    --dd-bs-blob-2: rgba(99, 102, 241, 0.15);
    
    --dd-bs-glass-bg: rgba(0, 0, 0, 0.3);
    --dd-bs-glass-hover: rgba(0, 0, 0, 0.4);
    --dd-bs-glass-border: rgba(255, 255, 255, 0.05);
    --dd-bs-toolbar-bg: rgba(30, 41, 59, 0.85);
}
[data-dd-bs-theme="navy"] body.dd-bookshelf-full-page,
[data-dd-bs-theme="navy"] #dd-bookshelf-app {
    background: radial-gradient(ellipse 80% 60% at 50% 0%, #1e293b 0%, #0f172a 50%, #020617 100%);
    background-size: cover;
    background-attachment: fixed;
}
[data-dd-bs-theme="navy"] .dd-bs-bg-blob { opacity: 0.15; }
[data-dd-bs-theme="navy"] input.dd-bs-search-input, [data-dd-bs-theme="navy"] .dd-bs-filter-btn, [data-dd-bs-theme="navy"] .dd-bs-sort-group, [data-dd-bs-theme="navy"] .dd-bs-page-btn { background: rgba(0,0,0,0.3); color: var(--dd-bs-ink); }
[data-dd-bs-theme="navy"] .dd-bs-sort-slider { background: #334155; }
[data-dd-bs-theme="navy"] .dd-bs-sort-btn.active { color: #fff; }

/* Pastel Theme */
[data-dd-bs-theme="pastel"] {
    --dd-bs-bg-cream: #fdf2f8;
    --dd-bs-bg-warm: #fce7f3;
    --dd-bs-bg-deep: #fbcfe8;
    --dd-bs-wood-dark: #f472b6;
    --dd-bs-wood: #f9a8d4;
    --dd-bs-wood-light: #fbcfe8;
    --dd-bs-wood-highlight: #fdf2f8;
    --dd-bs-paper: #fff;
    --dd-bs-paper-shadow: #fbcfe8;
    --dd-bs-ink: #831843;
    --dd-bs-ink-soft: #9d174d;
    --dd-bs-ink-light: #be185d;
    --dd-bs-accent: #ec4899;
    --dd-bs-accent-dark: #c93d82;
    --dd-bs-shadow: rgba(236, 72, 153, 0.15);
    --dd-bs-shadow-strong: rgba(236, 72, 153, 0.25);
    --dd-bs-shelf-grad-1: #fdf2f8;
    --dd-bs-shelf-grad-2: #fbcfe8;
    --dd-bs-shelf-grad-3: #f9a8d4;
    --dd-bs-shelf-grad-4: #f472b6;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.6);

    --dd-bs-cover-grad-1: #db2777;
    --dd-bs-cover-grad-2: #831843;

    --dd-bs-blob-1: rgba(236, 72, 153, 0.25);
    --dd-bs-blob-2: rgba(244, 114, 182, 0.25);
    
    --dd-bs-glass-bg: rgba(236, 72, 153, 0.08);
    --dd-bs-glass-hover: rgba(236, 72, 153, 0.15);
    --dd-bs-glass-border: rgba(236, 72, 153, 0.15);
    --dd-bs-toolbar-bg: rgba(253, 242, 248, 0.85);
}
[data-dd-bs-theme="pastel"] body.dd-bookshelf-full-page,
[data-dd-bs-theme="pastel"] #dd-bookshelf-app {
    background: radial-gradient(ellipse 80% 60% at 50% 0%, #fdf2f8 0%, #fce7f3 50%, #fbcfe8 100%);
    background-size: cover;
    background-attachment: fixed;
}
[data-dd-bs-theme="pastel"] .dd-bs-bg-blob { opacity: 0.4; }
[data-dd-bs-theme="pastel"] .dd-bs-sort-btn.active { color: var(--dd-bs-ink); }

/* Green Theme */
[data-dd-bs-theme="green"] {
    --dd-bs-bg-cream: #f0fdf4;
    --dd-bs-bg-warm: #dcfce7;
    --dd-bs-bg-deep: #bbf7d0;
    --dd-bs-wood-dark: #15803d;
    --dd-bs-wood: #16a34a;
    --dd-bs-wood-light: #22c55e;
    --dd-bs-wood-highlight: #4ade80;
    --dd-bs-paper: #fff;
    --dd-bs-paper-shadow: #bbf7d0;
    --dd-bs-ink: #14532d;
    --dd-bs-ink-soft: #166534;
    --dd-bs-ink-light: #15803d;
    --dd-bs-accent: #16a34a;
    --dd-bs-accent-dark: #12823b;
    --dd-bs-shadow: rgba(22, 163, 74, 0.15);
    --dd-bs-shadow-strong: rgba(22, 163, 74, 0.25);
    --dd-bs-shelf-grad-1: #4ade80;
    --dd-bs-shelf-grad-2: #22c55e;
    --dd-bs-shelf-grad-3: #16a34a;
    --dd-bs-shelf-grad-4: #15803d;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.6);

    --dd-bs-cover-grad-1: #15803d;
    --dd-bs-cover-grad-2: #052e16;

    --dd-bs-blob-1: rgba(22, 163, 74, 0.2);
    --dd-bs-blob-2: rgba(34, 197, 94, 0.2);
    
    --dd-bs-glass-bg: rgba(22, 163, 74, 0.08);
    --dd-bs-glass-hover: rgba(22, 163, 74, 0.15);
    --dd-bs-glass-border: rgba(22, 163, 74, 0.15);
    --dd-bs-toolbar-bg: rgba(240, 253, 244, 0.85);
}
[data-dd-bs-theme="green"] body.dd-bookshelf-full-page,
[data-dd-bs-theme="green"] #dd-bookshelf-app {
    background: radial-gradient(ellipse 80% 60% at 50% 0%, #f0fdf4 0%, #dcfce7 50%, #bbf7d0 100%);
    background-size: cover;
    background-attachment: fixed;
}
[data-dd-bs-theme="green"] .dd-bs-bg-blob { opacity: 0.3; }
[data-dd-bs-theme="green"] .dd-bs-sort-slider { background: #12823b; }
[data-dd-bs-theme="green"] .dd-bs-sort-btn.active { color: #fff; }

/* Blue Theme */
[data-dd-bs-theme="blue"] {
    --dd-bs-bg-cream: #f0f9ff;
    --dd-bs-bg-warm: #e0f2fe;
    --dd-bs-bg-deep: #bae6fd;
    --dd-bs-wood-dark: #0369a1;
    --dd-bs-wood: #0284c7;
    --dd-bs-wood-light: #38bdf8;
    --dd-bs-wood-highlight: #7dd3fc;
    --dd-bs-paper: #fff;
    --dd-bs-paper-shadow: #bae6fd;
    --dd-bs-ink: #0c4a6e;
    --dd-bs-ink-soft: #075985;
    --dd-bs-ink-light: #0369a1;
    --dd-bs-accent: #0284c7;
    --dd-bs-accent-dark: #0277b3;
    --dd-bs-shadow: rgba(2, 132, 199, 0.15);
    --dd-bs-shadow-strong: rgba(2, 132, 199, 0.25);
    --dd-bs-shelf-grad-1: #7dd3fc;
    --dd-bs-shelf-grad-2: #38bdf8;
    --dd-bs-shelf-grad-3: #0284c7;
    --dd-bs-shelf-grad-4: #0369a1;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.6);

    --dd-bs-cover-grad-1: #0369a1;
    --dd-bs-cover-grad-2: #0c4a6e;

    --dd-bs-blob-1: rgba(2, 132, 199, 0.2);
    --dd-bs-blob-2: rgba(56, 189, 248, 0.2);
    
    --dd-bs-glass-bg: rgba(2, 132, 199, 0.08);
    --dd-bs-glass-hover: rgba(2, 132, 199, 0.15);
    --dd-bs-glass-border: rgba(2, 132, 199, 0.15);
    --dd-bs-toolbar-bg: rgba(240, 249, 255, 0.85);
}
[data-dd-bs-theme="blue"] body.dd-bookshelf-full-page,
[data-dd-bs-theme="blue"] #dd-bookshelf-app {
    background: radial-gradient(ellipse 80% 60% at 50% 0%, #f0f9ff 0%, #e0f2fe 50%, #bae6fd 100%);
    background-size: cover;
    background-attachment: fixed;
}
[data-dd-bs-theme="blue"] .dd-bs-bg-blob { opacity: 0.3; }
[data-dd-bs-theme="blue"] .dd-bs-sort-slider { background: #0277b3; }
[data-dd-bs-theme="blue"] .dd-bs-sort-btn.active { color: #fff; }

/* Solid Light Theme */
[data-dd-bs-theme="solid-light"] {
    --dd-bs-bg-cream: #ffffff;
    --dd-bs-bg-warm: #f4f4f5;
    --dd-bs-bg-deep: #e4e4e7;
    --dd-bs-wood-dark: #d4d4d8;
    --dd-bs-wood: #a1a1aa;
    --dd-bs-wood-light: #e4e4e7;
    --dd-bs-wood-highlight: #f4f4f5;
    --dd-bs-paper: #ffffff;
    --dd-bs-paper-shadow: #e4e4e7;
    --dd-bs-ink: #18181b;
    --dd-bs-ink-soft: #3f3f46;
    --dd-bs-ink-light: #71717a;
    --dd-bs-accent: #52525b;
    --dd-bs-accent-dark: #52525b;
    --dd-bs-shadow: rgba(0, 0, 0, 0.05);
    --dd-bs-shadow-strong: rgba(0, 0, 0, 0.1);
    --dd-bs-shelf-grad-1: #f4f4f5;
    --dd-bs-shelf-grad-2: #e4e4e7;
    --dd-bs-shelf-grad-3: #d4d4d8;
    --dd-bs-shelf-grad-4: #a1a1aa;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.8);

    --dd-bs-cover-grad-1: #52525b;
    --dd-bs-cover-grad-2: #18181b;

    --dd-bs-blob-1: rgba(82, 82, 91, 0.1);
    --dd-bs-blob-2: rgba(63, 63, 70, 0.1);
    --dd-bs-glass-bg: rgba(0, 0, 0, 0.04);
    --dd-bs-glass-hover: rgba(0, 0, 0, 0.08);
    --dd-bs-glass-border: rgba(0, 0, 0, 0.08);
    --dd-bs-toolbar-bg: rgba(255, 255, 255, 0.95);
}
[data-dd-bs-theme="solid-light"] body.dd-bookshelf-full-page, [data-dd-bs-theme="solid-light"] #dd-bookshelf-app { background: #f4f4f5; }
[data-dd-bs-theme="solid-light"] .dd-bs-bg-blob { display: none; }
[data-dd-bs-theme="solid-light"] .dd-bs-sort-btn.active { color: var(--dd-bs-ink); }

/* Solid Dark Theme */
[data-dd-bs-theme="solid-dark"] {
    --dd-bs-bg-cream: #27272a;
    --dd-bs-bg-warm: #18181b;
    --dd-bs-bg-deep: #09090b;
    --dd-bs-wood-dark: #18181b;
    --dd-bs-wood: #27272a;
    --dd-bs-wood-light: #3f3f46;
    --dd-bs-wood-highlight: #52525b;
    --dd-bs-paper: #27272a;
    --dd-bs-paper-shadow: #18181b;
    --dd-bs-ink: #fafafa;
    --dd-bs-ink-soft: #d4d4d8;
    --dd-bs-ink-light: #a1a1aa;
    --dd-bs-accent: #a1a1aa;
    --dd-bs-accent-dark: #717177;
    --dd-bs-shadow: rgba(0, 0, 0, 0.5);
    --dd-bs-shadow-strong: rgba(0, 0, 0, 0.8);
    --dd-bs-shelf-grad-1: #3f3f46;
    --dd-bs-shelf-grad-2: #27272a;
    --dd-bs-shelf-grad-3: #18181b;
    --dd-bs-shelf-grad-4: #09090b;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.1);

    --dd-bs-cover-grad-1: #3f3f46;
    --dd-bs-cover-grad-2: #18181b;

    --dd-bs-blob-1: rgba(63, 63, 70, 0.15);
    --dd-bs-blob-2: rgba(39, 39, 42, 0.15);
    --dd-bs-glass-bg: rgba(0, 0, 0, 0.3);
    --dd-bs-glass-hover: rgba(0, 0, 0, 0.4);
    --dd-bs-glass-border: rgba(255, 255, 255, 0.05);
    --dd-bs-toolbar-bg: rgba(39, 39, 42, 0.95);
}
[data-dd-bs-theme="solid-dark"] body.dd-bookshelf-full-page, [data-dd-bs-theme="solid-dark"] #dd-bookshelf-app { background: #18181b; }
[data-dd-bs-theme="solid-dark"] .dd-bs-bg-blob { display: none; }
[data-dd-bs-theme="solid-dark"] input.dd-bs-search-input, [data-dd-bs-theme="solid-dark"] .dd-bs-filter-btn, [data-dd-bs-theme="solid-dark"] .dd-bs-sort-group, [data-dd-bs-theme="solid-dark"] .dd-bs-page-btn { background: rgba(0,0,0,0.3); color: var(--dd-bs-ink); }
[data-dd-bs-theme="solid-dark"] .dd-bs-sort-slider { background: #3f3f46; }
[data-dd-bs-theme="solid-dark"] .dd-bs-sort-btn.active { color: #fff; }

/* Solid Warm Theme */
[data-dd-bs-theme="solid-warm"] {
    --dd-bs-bg-cream: #faf5e9;
    --dd-bs-bg-warm: #f4efe1;
    --dd-bs-bg-deep: #e8dcc0;
    --dd-bs-wood-dark: #8b5a3c;
    --dd-bs-wood: #a87444;
    --dd-bs-wood-light: #e8dcc0;
    --dd-bs-wood-highlight: #faf5e9;
    --dd-bs-paper: #faf5e9;
    --dd-bs-paper-shadow: #e8dcc0;
    --dd-bs-ink: #2c2418;
    --dd-bs-ink-soft: #5c4e3a;
    --dd-bs-ink-light: #8a7a5e;
    --dd-bs-accent: #c8973d;
    --dd-bs-accent-dark: #8c6a2b;
    --dd-bs-shadow: rgba(60, 40, 20, 0.1);
    --dd-bs-shadow-strong: rgba(60, 40, 20, 0.2);
    --dd-bs-shelf-grad-1: #faf5e9;
    --dd-bs-shelf-grad-2: #e8dcc0;
    --dd-bs-shelf-grad-3: #a87444;
    --dd-bs-shelf-grad-4: #8b5a3c;
    --dd-bs-shelf-edge-2: rgba(255, 255, 255, 0.8);

    --dd-bs-cover-grad-1: #8b3a22;
    --dd-bs-cover-grad-2: #4a1f10;

    --dd-bs-blob-1: rgba(224, 184, 112, 0.3);
    --dd-bs-blob-2: rgba(200, 148, 102, 0.3);
    --dd-bs-glass-bg: rgba(139, 90, 60, 0.04);
    --dd-bs-glass-hover: rgba(139, 90, 60, 0.08);
    --dd-bs-glass-border: rgba(139, 90, 60, 0.08);
    --dd-bs-toolbar-bg: rgba(250, 245, 233, 0.95);
}
[data-dd-bs-theme="solid-warm"] body.dd-bookshelf-full-page, [data-dd-bs-theme="solid-warm"] #dd-bookshelf-app { background: #f4efe1; }
[data-dd-bs-theme="solid-warm"] .dd-bs-bg-blob { display: none; }
[data-dd-bs-theme="solid-warm"] .dd-bs-sort-slider { background: #97683d; }
[data-dd-bs-theme="solid-warm"] .dd-bs-sort-btn.active { color: #fff; }


/* Scoped reset — only affects elements inside the bookshelf widget, not the
   entire theme page. This prevents conflicts with the active theme's layout. */
#dd-bookshelf-app *, #dd-bookshelf-app *::before, #dd-bookshelf-app *::after {
    box-sizing: border-box;
}

#dd-bookshelf-app *:focus-visible {
    outline: 2px solid var(--dd-bs-accent);
    outline-offset: 2px;
}

#dd-bookshelf-app {
    position: relative;
    font-family: var(--dd-bs-font-family);
    color: var(--dd-bs-ink);
    min-height: 100vh;
    overflow-x: hidden;
    /* Default background (warm cream) — applies when no per-theme rule overrides it.
       Per-theme selectors above have higher specificity and override this. */
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, #faf2dc 0%, #ede0c0 50%, #d9c8a0 100%);
    background-size: cover;
    background-attachment: fixed;
}

/* Reset main tag to prevent active WP theme from adding unwanted backgrounds or shadows to our bookshelf main container */
#dd-bookshelf-app .dd-bs-main-content {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    margin: 0 !important;
    padding: 0 !important;
}
#dd-bookshelf-app .dd-bs-main-content::before,
#dd-bookshelf-app .dd-bs-main-content::after {
    display: none !important;
    content: none !important;
}

/* The full-page template uses body.dd-bookshelf-full-page and CAN safely style
   html/body since it replaces the entire theme template.
   IMPORTANT: This is the DEFAULT background (warm cream gradient). It must NOT
   include [data-dd-bs-theme] in the selector — otherwise it would have the same
   specificity as the per-theme rules below and override them (CSS uses source
   order as tiebreaker, and this rule comes after the theme rules). The per-theme
   rules at lines 73-338 use [data-dd-bs-theme="X"] body.dd-bookshelf-full-page
   which has higher specificity (attribute + class + element = 0,2,1) and wins
   over this plain body.dd-bookshelf-full-page (class + element = 0,1,1). */
body.dd-bookshelf-full-page {
    font-family: var(--dd-bs-font-family);
    color: var(--dd-bs-ink);
    min-height: 100vh;
    overflow-x: hidden;
    margin: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, #faf2dc 0%, #ede0c0 50%, #d9c8a0 100%);
    background-size: cover;
    background-attachment: fixed;
}

body.dd-bookshelf-full-page::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.4 0 0 0 0 0.3 0 0 0 0 0.2 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.6;
    pointer-events: none;
    z-index: 1;
}

#dd-bookshelf-app::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.4 0 0 0 0 0.3 0 0 0 0 0.2 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.6;
    pointer-events: none;
    z-index: 1;
}

.dd-bs-bg-decoration {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.dd-bs-bg-blob {
    position: absolute;
    border-radius: 50%;
    opacity: 0.4;
}

.dd-bs-bg-blob.dd-bs-b1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--dd-bs-blob-1) 0%, transparent 70%);
    top: -150px;
    left: -100px;
    animation: drift 25s ease-in-out infinite;
}

.dd-bs-bg-blob.dd-bs-b2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--dd-bs-blob-2) 0%, transparent 70%);
    bottom: -100px;
    right: -100px;
    animation: drift 30s ease-in-out infinite reverse;
}

@keyframes drift {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(50px, -30px) scale(1.1);
    }
}

/* Return / Back Button */
.dd-bs-return-btn {
    position: fixed;
    top: 24px;
    left: 24px;
    z-index: 150;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--dd-bs-toolbar-bg);
    border: 1px solid var(--dd-bs-glass-border);
    color: var(--dd-bs-ink);
    box-shadow: 0 8px 24px var(--dd-bs-shadow);
    backdrop-filter: blur(12px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none !important;
}
.dd-bs-return-btn:hover {
    background: var(--dd-bs-glass-hover);
    transform: scale(1.08);
    color: var(--dd-bs-accent);
}
body.admin-bar .dd-bs-return-btn {
    top: calc(24px + 32px);
}
@media (max-width: 782px) {
    body.admin-bar .dd-bs-return-btn {
        top: calc(16px + 46px);
    }
}
@media (max-width: 600px) {
    .dd-bs-return-btn {
        top: 16px;
        left: 16px;
        width: 38px;
        height: 38px;
    }
}

/* Floating Toolbar */
.dd-bs-toolbar {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 8px 8px 20px;
    background: var(--dd-bs-toolbar-bg);
    border: 1px solid var(--dd-bs-glass-border);
    border-radius: 50px;
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 28px var(--dd-bs-shadow);
    flex-wrap: nowrap;
    width: 760px;
    max-width: calc(100vw - 40px);
}
/* Push the toolbar below the WordPress admin bar (32px) when logged in. */
body.admin-bar .dd-bs-toolbar { top: calc(24px + 32px); }
@media (max-width: 782px) {
    body.admin-bar .dd-bs-toolbar { top: calc(16px + 46px); }
}

/* ===== Mobile FAB + Overlay (hidden on desktop) =====
   On screens >900px the FAB and backdrop are display:none.
   On mobile they provide a floating search button that opens
   the toolbar as a bottom sheet overlay. */
.dd-bs-fab-toggle {
    display: none;
}
.dd-bs-toolbar-backdrop {
    display: none;
}
.dd-bs-toolbar-close {
    display: none;
}

.dd-bs-search-wrapper {
    position: relative;
    min-width: 220px;
    flex: 1;
}

/* Scope the search input to the plugin container so aggressive theme
   selectors like "#content input[type=text]" (specificity 1,1,1) or
   "body input[type=search]" cannot override our styling. #id + type + class
   gives (1,1,1) at minimum, plus !important on the conflict-prone props. */
#dd-bookshelf-app input.dd-bs-search-input,
body.dd-bookshelf-full-page input.dd-bs-search-input {
    width: 100% !important;
    height: auto !important;
    margin: 0 !important;
    padding: 10px 20px 10px 42px !important;
    font-family: var(--dd-bs-font-family) !important;
    font-size: 14px !important;
    line-height: normal !important;
    color: var(--dd-bs-ink) !important;
    background: var(--dd-bs-glass-bg) !important;
    border: 1px solid var(--dd-bs-glass-border) !important;
    border-radius: 30px !important;
    outline: none !important;
    box-shadow: none !important;
    transition: all 0.3s;
    box-sizing: border-box !important;
    -webkit-appearance: none !important;
    appearance: none !important;
}

#dd-bookshelf-app input.dd-bs-search-input::placeholder,
body.dd-bookshelf-full-page input.dd-bs-search-input::placeholder {
    color: var(--dd-bs-ink-light);
}

#dd-bookshelf-app input.dd-bs-search-input:focus,
body.dd-bookshelf-full-page input.dd-bs-search-input:focus {
    background: var(--dd-bs-bg-cream) !important;
    border-color: var(--dd-bs-accent) !important;
    box-shadow: 0 2px 8px var(--dd-bs-shadow) !important;
    outline: none !important;
}

.dd-bs-search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--dd-bs-wood);
    pointer-events: none;
}

.dd-bs-search-clear-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.05);
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dd-bs-ink-light);
    cursor: pointer;
    transition: all 0.2s;
}
.dd-bs-search-clear-btn:hover {
    background: rgba(0,0,0,0.1);
    color: var(--dd-bs-ink);
}
[data-dd-bs-theme="solid-dark"] .dd-bs-search-clear-btn, [data-dd-bs-theme="navy"] .dd-bs-search-clear-btn {
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
}
[data-dd-bs-theme="solid-dark"] .dd-bs-search-clear-btn:hover, [data-dd-bs-theme="navy"] .dd-bs-search-clear-btn:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

.dd-bs-filter-dropdown {
    position: relative;
}

.dd-bs-filter-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    font-family: var(--dd-bs-font-family);
    font-size: 14px;
    font-weight: 500;
    color: var(--dd-bs-ink);
    background: var(--dd-bs-glass-bg);
    border: 1px solid transparent;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
    min-width: 130px;
}

.dd-bs-filter-btn:hover {
    background: var(--dd-bs-glass-hover);
}

/* Dark mode toggle — a round icon button. Separate from .dd-bs-filter-btn
   so the mobile flex:1 rule (which stretches filter buttons) does NOT
   deform this button. It stays a fixed 38px circle at all breakpoints. */
.dd-bs-theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    min-width: 38px;
    padding: 0;
    font-size: 18px;
    line-height: 1;
    border-radius: 50%;
    border: 1px solid transparent;
    background: var(--dd-bs-glass-bg);
    color: var(--dd-bs-ink);
    cursor: pointer;
    transition: all 0.3s;
}
.dd-bs-theme-toggle:hover {
    background: var(--dd-bs-glass-hover);
}
[data-dd-bs-theme="solid-dark"] .dd-bs-theme-toggle,
[data-dd-bs-theme="navy"] .dd-bs-theme-toggle {
    background: rgba(0, 0, 0, 0.3);
}

.dd-bs-filter-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--dd-bs-bg-cream);
    border: 1px solid var(--dd-bs-glass-border);
    border-radius: 16px;
    box-shadow: 0 12px 32px var(--dd-bs-shadow);
    padding: 8px;
    min-width: 220px;
    max-height: 340px;
    overflow-y: auto;
    display: none;
    flex-direction: column;
    gap: 3px;
    z-index: 150;
    backdrop-filter: blur(16px);
    font-family: var(--dd-bs-font-family);
}
.dd-bs-filter-menu.show {
    display: flex;
}

.dd-bs-filter-item {
    padding: 9px 14px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 500;
    font-family: var(--dd-bs-font-family);
    color: var(--dd-bs-ink-soft);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    white-space: nowrap;
}
.dd-bs-filter-item:hover {
    background: var(--dd-bs-glass-hover);
    color: var(--dd-bs-ink);
}
.dd-bs-filter-item.active {
    background: var(--dd-bs-accent);
    color: #ffffff;
    font-weight: 600;
}
.dd-bs-filter-item[data-depth="1"] { padding-left: 26px; font-size: 13px; opacity: 0.95; }
.dd-bs-filter-item[data-depth="2"] { padding-left: 38px; font-size: 12.5px; opacity: 0.9; }
.dd-bs-filter-item[data-depth="3"] { padding-left: 50px; font-size: 12px; opacity: 0.85; }

/* ===== Left Sidebar Filter Layout ===== */
.dd-bs-layout-top .dd-bs-sidebar-filter {
    display: none;
}
@media (max-width: 900px) {
    .dd-bs-layout-top .dd-bs-sidebar-filter {
        display: flex;
    }
}

.dd-bs-layout-container {
    width: 100%;
}
.dd-bs-layout-container.dd-bs-layout-sidebar {
    display: flex;
    gap: 32px;
    align-items: flex-start;
    padding-top: 24px;
    max-width: 1400px;
    margin: 0 auto;
    box-sizing: border-box;
}

.dd-bs-sidebar-filter {
    width: 280px;
    min-width: 280px;
    max-width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 24px;
    background: var(--dd-bs-toolbar-bg);
    border: 1px solid var(--dd-bs-glass-border);
    border-radius: 24px;
    backdrop-filter: blur(16px);
    box-shadow: 0 10px 32px var(--dd-bs-shadow);
    padding: 24px 20px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 100;
    font-family: var(--dd-bs-font-family);
}
body.admin-bar .dd-bs-sidebar-filter { top: calc(24px + 32px); }

.dd-bs-layout-sidebar .dd-bs-main-content {
    flex: 1;
    min-width: 0;
    min-height: 450px;
}

.dd-bs-bookcase {
    transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.dd-bs-bookcase.dd-bs-updating {
    opacity: 0.55;
    pointer-events: none;
}

.dd-bs-layout-sidebar .dd-bs-bookcase {
    padding-top: 10px;
}

.dd-bs-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.dd-bs-sidebar-title {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    font-family: var(--dd-bs-font-family);
    color: var(--dd-bs-ink);
}
.dd-bs-sidebar-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    font-family: var(--dd-bs-font-family);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--dd-bs-ink-light);
    margin-bottom: 10px;
}

.dd-bs-sidebar-section {
    display: flex;
    flex-direction: column;
    margin-top: 24px;
}
.dd-bs-sidebar-section:first-child {
    margin-top: 0;
}

.dd-bs-categories-tree {
    display: flex;
    flex-direction: column;
    gap: 3px;
    max-height: 380px;
    overflow-y: auto;
    padding-right: 4px;
}

.dd-bs-tree-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 12px;
    border-radius: 12px;
    font-size: 13.5px;
    font-weight: 500;
    font-family: var(--dd-bs-font-family);
    color: var(--dd-bs-ink-soft);
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
    position: relative;
}
.dd-bs-tree-item:hover {
    background: var(--dd-bs-glass-hover);
    color: var(--dd-bs-ink);
}
.dd-bs-tree-item.active {
    background: var(--dd-bs-accent);
    color: #ffffff;
    font-weight: 600;
}
.dd-bs-tree-item[data-depth="1"] { padding-left: 24px; font-size: 13px; }
.dd-bs-tree-item[data-depth="2"] { padding-left: 36px; font-size: 12.5px; }
.dd-bs-tree-item[data-depth="3"] { padding-left: 48px; font-size: 12px; }

.dd-bs-tree-item[data-depth="1"]::before {
    content: ''; position: absolute; left: 12px; top: -14px; bottom: 50%; width: 6px;
    border-left: 1px solid var(--dd-bs-ink-light); border-bottom: 1px solid var(--dd-bs-ink-light);
    border-bottom-left-radius: 3px; opacity: 0.25;
}
.dd-bs-tree-item[data-depth="2"]::before {
    content: ''; position: absolute; left: 24px; top: -14px; bottom: 50%; width: 6px;
    border-left: 1px solid var(--dd-bs-ink-light); border-bottom: 1px solid var(--dd-bs-ink-light);
    border-bottom-left-radius: 3px; opacity: 0.25;
}
.dd-bs-tree-item[data-depth="3"]::before {
    content: ''; position: absolute; left: 36px; top: -14px; bottom: 50%; width: 6px;
    border-left: 1px solid var(--dd-bs-ink-light); border-bottom: 1px solid var(--dd-bs-ink-light);
    border-bottom-left-radius: 3px; opacity: 0.25;
}

.dd-bs-count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 11px;
    background: var(--dd-bs-glass-hover);
    color: var(--dd-bs-ink-soft);
    font-size: 11px;
    font-weight: 600;
}
.dd-bs-filter-item.active .dd-bs-count-badge,
.dd-bs-tree-item.active .dd-bs-count-badge {
    background: rgba(255,255,255,0.25);
    color: #ffffff;
}

.dd-bs-theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    border-radius: 14px;
    border: 1px solid var(--dd-bs-glass-border);
    background: var(--dd-bs-glass-bg);
    color: var(--dd-bs-ink);
    font-size: 13.5px;
    font-weight: 500;
    font-family: var(--dd-bs-font-family);
    cursor: pointer;
    transition: all 0.2s;
}
.dd-bs-theme-toggle-btn:hover {
    background: var(--dd-bs-glass-hover);
}

.dd-bs-sort-group {
    position: relative;
    display: flex;
    background: var(--dd-bs-glass-bg);
    border-radius: 30px;
    padding: 4px;
    min-width: 140px;
}

.dd-bs-sort-slider {
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 4px;
    width: calc(50% - 4px);
    background: var(--dd-bs-wood);
    border-radius: 30px;
    box-shadow: 0 2px 6px var(--dd-bs-shadow);
    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    z-index: 1;
    transform: translateX(100%);
}

.dd-bs-sort-btn {
    position: relative;
    z-index: 2;
    flex: 1;
    padding: 6px 14px;
    font-family: var(--dd-bs-font-family);
    font-size: 12px;
    font-weight: 500;
    color: var(--dd-bs-ink-soft);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.3s;
    letter-spacing: 0.5px;
    text-align: center;
}

.dd-bs-sort-btn.active {
    color: var(--dd-bs-paper);
}

/* Bookcase */
.dd-bs-bookcase {
    position: relative;
    z-index: 5;
    padding: 110px 40px 60px;
    max-width: 1400px;
    margin: 0 auto;
}
/* Extra top padding when the WordPress admin bar is showing. */
body.admin-bar .dd-bs-bookcase { padding-top: 142px; }
@media (max-width: 900px) {
    body.admin-bar .dd-bs-bookcase { padding-top: 20px; }
}

.dd-bs-shelf-row {
    position: relative;
    margin-bottom: 50px;
}

.dd-bs-shelf-books {
    display: flex;
    align-items: flex-end;
    gap: clamp(15px, 2.5vw, 40px);
    min-height: 250px;
    padding: 0 40px;
    position: relative;
    z-index: 2;
    flex-wrap: nowrap;
}

.dd-bs-shelf-plank {
    position: relative;
    height: 22px;
    background: linear-gradient(180deg, var(--dd-bs-shelf-grad-1) 0%, var(--dd-bs-shelf-grad-2) 30%, var(--dd-bs-shelf-grad-3) 70%, var(--dd-bs-shelf-grad-4) 100%);
    box-shadow:
        0 6px 0 -2px rgba(0,0,0,0.4),
        0 14px 24px rgba(0,0,0,0.25),
        inset 0 1px 0 rgba(255,255,255,0.1);
    border-radius: 2px;
}

.dd-bs-shelf-plank::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(90deg,
            transparent 0px,
            transparent 60px,
            rgba(0, 0, 0, 0.06) 60px,
            rgba(0, 0, 0, 0.06) 61px,
            transparent 61px,
            transparent 120px),
        repeating-linear-gradient(90deg,
            rgba(255, 255, 255, 0.04) 0px,
            rgba(255, 255, 255, 0.04) 2px,
            transparent 2px,
            transparent 90px);
    border-radius: 2px;
}

.dd-bs-shelf-plank::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--dd-bs-shelf-edge-1) 0%, var(--dd-bs-shelf-edge-2) 50%, var(--dd-bs-shelf-edge-3) 100%);
}

/* Solid Theme Overrides for Shelf */
[data-dd-bs-theme^="solid-"] .dd-bs-shelf-plank {
    background: var(--dd-bs-shelf-grad-3);
    height: 12px;
    box-shadow: 0 4px 12px var(--dd-bs-shadow);
    border-radius: 6px;
}
[data-dd-bs-theme^="solid-"] .dd-bs-shelf-plank::before,
[data-dd-bs-theme^="solid-"] .dd-bs-shelf-plank::after {
    display: none;
}

/* Book cover */
.dd-bs-book {
    position: relative;
    cursor: pointer;
    transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-origin: bottom center;
    flex-shrink: 0;
    filter: drop-shadow(3px 6px 10px rgba(60, 40, 20, 0.4));
    /* Rendered as an <a> for accessibility/no-JS fallback; reset anchor
       defaults so it behaves like the reference's <div> (no underline,
       inherit color, block layout so flex-shrink applies). */
    display: block;
    text-decoration: none;
    color: inherit;
}

.dd-bs-book:hover {
    transform: translateY(-8px) scale(1.02);
    filter: drop-shadow(4px 12px 20px rgba(0, 0, 0, 0.45));
    z-index: 10;
}

/* 3D Book Edge (Pages) */
.dd-bs-book::before {
    content: '';
    position: absolute;
    right: -4px;
    top: 2px;
    bottom: 2px;
    width: 4px;
    background: var(--dd-bs-paper);
    border-radius: 0 4px 4px 0;
    border: 1px solid var(--dd-bs-glass-border);
    border-left: none;
    box-shadow: inset -1px 0 2px var(--dd-bs-shadow);
    z-index: -1;
}

/* Custom Tooltip */
.dd-bs-book-tooltip {
    position: absolute;
    top: calc(100% + 15px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 6px 12px;
    border-radius: 6px;
    font-family: var(--dd-bs-font-family);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}

.dd-bs-tooltip-title {
    font-size: 15px;
    font-weight: 500;
}

.dd-bs-tooltip-author {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
}

.dd-bs-book:hover .dd-bs-book-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    transition-delay: 0.4s;
}

.dd-bs-book-cover {
    position: relative;
    width: 160px;
    height: 230px;
    border-radius: 2px 6px 6px 2px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow:
        inset 5px 0 10px -2px rgba(0, 0, 0, 0.35),
        inset -2px 0 4px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        3px 5px 12px var(--dd-bs-shadow-strong);
}

.dd-bs-book-cover::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 7px;
    background: linear-gradient(90deg,
            rgba(0, 0, 0, 0.45) 0%,
            rgba(0, 0, 0, 0.25) 40%,
            rgba(0, 0, 0, 0.08) 70%,
            transparent 100%);
    z-index: 5;
    pointer-events: none;
}

.dd-bs-book-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.08 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.5;
    mix-blend-mode: overlay;
    pointer-events: none;
    z-index: 4;
}


.dd-bs-cover-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--dd-bs-badge-color, linear-gradient(135deg, #82d822 0%, #5fb812 100%));
    color: var(--dd-bs-badge-text-color, #fff);
    padding: 3px 8px;
    border-radius: 12px;
    font-family: var(--dd-bs-font-family);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.5px;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.3);
    z-index: 6;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    line-height: 1.2;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.dd-bs-cover-gloss {
    position: absolute;
    top: 0;
    left: 8px;
    width: 25px;
    bottom: 0;
    background: linear-gradient(90deg,
            transparent 0%,
            rgba(255, 255, 255, 0.08) 50%,
            transparent 100%);
    pointer-events: none;
    z-index: 3;
}

.dd-bs-shelf-info {
    text-align: center;
    padding: 24px;
    font-family: var(--dd-bs-font-family);
    font-size: 13px;
    color: var(--dd-bs-ink-light);
    letter-spacing: 2px;
}

.dd-bs-shelf-info .dd-bs-count {
    color: var(--dd-bs-wood);
    font-weight: 600;
}

.dd-bs-empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--dd-bs-ink-soft);
    font-family: var(--dd-bs-font-family);
    animation: emptyFadeIn 0.4s ease-out forwards;
}

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

.dd-bs-empty-state-icon {
    font-size: 56px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.dd-bs-clear-search-btn {
    padding: 10px 24px;
    font-family: var(--dd-bs-font-family);
    font-size: 14px;
    font-weight: 500;
    color: var(--dd-bs-bg-cream);
    background: var(--dd-bs-ink);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 12px var(--dd-bs-shadow);
}
.dd-bs-clear-search-btn:hover {
    background: var(--dd-bs-ink-soft);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--dd-bs-shadow-strong);
}

/* Responsive */
@media (max-width: 1100px) {
    :root {
        --dd-bs-page-width: min(46vw, 600px);
        --dd-bs-page-height: min(82vh, 780px);
    }
}

@media (max-width: 900px) {
    :root {
        --dd-bs-page-width: min(75vw, 500px);
        --dd-bs-page-height: min(70vh, 650px);
    }

    /* Transform toolbar into a bottom-sheet overlay on mobile */
    .dd-bs-toolbar {
        position: fixed;
        bottom: 0;
        top: auto;
        left: 0 !important;
        right: 0;
        transform: translateY(100%);
        width: 100%;
        max-width: none;
        flex-direction: column;
        align-items: stretch;
        padding: 20px 16px calc(20px + env(safe-area-inset-bottom, 0px));
        border-radius: 24px 24px 0 0;
        gap: 12px;
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                    opacity 0.3s ease, visibility 0.3s ease;
        z-index: 200;
    }
    .dd-bs-toolbar.dd-bs-toolbar-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    body.admin-bar .dd-bs-toolbar {
        top: auto;
        bottom: 0;
    }

    .dd-bs-search-wrapper {
        width: calc(100% - 48px); /* Reserve space for the close button */
        min-width: 0;
        flex-basis: auto;
        order: -1;
    }

    /* In the column overlay, controls should stretch full-width */
    .dd-bs-filter-dropdown,
    .dd-bs-sort-group,
    .dd-bs-filter-btn {
        width: 100%;
        min-width: 0;
    }
    .dd-bs-filter-btn {
        justify-content: center;
    }

    /* Show FAB button on mobile */
    .dd-bs-fab-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        bottom: calc(20px + env(safe-area-inset-bottom, 0px));
        right: 20px;
        width: 56px;
        height: 56px;
        min-width: 56px;
        border-radius: 50%;
        border: none;
        background: var(--dd-bs-accent-dark);
        color: #fff;
        cursor: pointer;
        z-index: 150;
        box-shadow: 0 6px 20px var(--dd-bs-shadow-strong);
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .dd-bs-fab-toggle:active {
        transform: scale(0.92);
    }

    /* Show close button inside the toolbar overlay */
    .dd-bs-toolbar-close {
        display: flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        top: 12px;
        right: 12px;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        border: none;
        background: var(--dd-bs-glass-hover);
        color: var(--dd-bs-ink);
        cursor: pointer;
        z-index: 210;
    }

    /* Show backdrop when toolbar is open.
       Uses visibility (not display) so opacity can animate on BOTH
       open AND close — display:none kills transitions. */
    .dd-bs-toolbar-backdrop {
        display: block;
        visibility: hidden;
        opacity: 0;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 180;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    .dd-bs-toolbar-backdrop.dd-bs-backdrop-visible {
        visibility: visible;
        opacity: 1;
    }

    /* Reduce bookcase top padding — no sticky toolbar on mobile */
    .dd-bs-bookcase {
        padding: 20px 16px 100px;
    }

    .dd-bs-shelf-books {
        gap: 20px;
        padding: 0 20px;
    }

    .dd-bs-book-cover {
        width: 130px;
        height: 187px;
    }
}

@media (max-width: 900px) {
    .dd-bs-layout-container.dd-bs-layout-sidebar {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        padding-top: 10px;
    }
    .dd-bs-layout-sidebar .dd-bs-main-content {
        width: 100%;
    }
    .dd-bs-bookcase {
        width: 100%;
        margin: 0 auto;
        box-sizing: border-box;
    }
    .dd-bs-sidebar-filter {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 100vw;
        max-width: 100vw;
        height: 100vh;
        height: 100dvh;
        border-radius: 0;
        transform: translateX(-100%);
        z-index: 200;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
    }
    body.admin-bar .dd-bs-sidebar-filter {
        top: 32px;
        height: calc(100vh - 32px);
        height: calc(100dvh - 32px);
    }
    @media screen and (max-width: 782px) {
        body.admin-bar .dd-bs-sidebar-filter {
            top: 46px;
            height: calc(100vh - 46px);
            height: calc(100dvh - 46px);
        }
    }
    .dd-bs-sidebar-filter.dd-bs-sidebar-open {
        transform: translateX(0);
    }
    .dd-bs-sidebar-header .dd-bs-toolbar-close {
        display: flex;
        position: static;
    }
}

@media (max-width: 600px) {
    :root {
        --dd-bs-page-width: min(90vw, 400px);
        --dd-bs-page-height: min(65vh, 580px);
    }
    
    .dd-bs-sort-group {
        width: 100%;
        justify-content: center;
    }

    .dd-bs-filter-btn {
        min-width: auto;
        flex: 1;
        justify-content: center;
    }

    .dd-bs-bookcase {
        width: 100%;
        padding: 20px 10px 40px; /* Reduced top padding for mobile */
        margin: 0 auto;
        box-sizing: border-box;
    }
    
    .dd-bs-shelf-row {
        margin-bottom: 25px; /* Reduce massive gap between shelves on mobile */
    }
    
    .dd-bs-shelf-books {
        gap: 12px;
        padding: 0 16px;
        justify-content: center;
        min-height: 195px; /* Reduce empty vertical space above books */
    }

    .dd-bs-sidebar-filter {
        width: 100%;
        max-width: 100%;
        border-radius: 0;
    }

    .dd-bs-book-cover {
        width: 125px;
        height: 180px;
    }
    
    .dd-bs-book-cover.dd-bs-cover-landscape {
        width: 130px; /* Adjusted to fit 2 landscape books on 320px screens */
        height: 91px;
    }
}

.dd-bs-pdf-canvas-cover {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Changed to cover so the image fills the book fully without brown letterboxing */
    position: relative;
    z-index: 2;
}

/* Landscape Book Covers */
.dd-bs-book-cover.dd-bs-cover-landscape {
    width: 250px;
    height: 175px;
}

@media (max-width: 900px) {
    .dd-bs-book-cover.dd-bs-cover-landscape {
        width: 200px;
        height: 140px;
    }
}

@media (max-width: 600px) {
    .dd-bs-book-cover.dd-bs-cover-landscape {
        width: 160px;
        height: 115px;
    }
}

/* Fullscreen Viewer Override */
.dd-lb-overlay {
    padding: 0 !important;
}
.dd-lb-box {
    width: 100vw !important;
    height: 100dvh !important;
    max-width: 100vw !important;
    max-height: 100dvh !important;
    border-radius: 0 !important;
}
/* Initial Loader */
.dd-bs-initial-loader {
    position: fixed;
    inset: 0;
    background: var(--dd-bs-bg-cream);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.dd-bs-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.dd-bs-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--dd-bs-wood-light);
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
}

.dd-bs-loading-text {
    font-family: var(--dd-bs-font-family);
    color: var(--dd-bs-wood);
    font-size: 16px;
    font-weight: 500;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== Numbered Pagination (mode = pagination) =====
   Scoped to the plugin container (and the full-page body) with high-specificity
   selectors so active WordPress themes cannot override the button styling. */
#dd-bs-pagination:not(:empty) {
    padding: 20px;
}

#dd-bookshelf-app .dd-bs-pagination-nav,
body.dd-bookshelf-full-page .dd-bs-pagination-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 10px;
}

#dd-bookshelf-app .dd-bs-page-btn,
body.dd-bookshelf-full-page .dd-bs-page-btn {
    min-width: 38px;
    height: 38px;
    padding: 0 10px;
    border-radius: 8px !important;
    border: 1px solid var(--dd-bs-glass-border) !important;
    background: var(--dd-bs-glass-bg) !important;
    color: var(--dd-bs-ink) !important;
    font-family: var(--dd-bs-font-family) !important;
    font-size: 14px !important;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    box-sizing: border-box !important;
}

#dd-bookshelf-app .dd-bs-page-btn:hover:not(.disabled):not(:disabled),
body.dd-bookshelf-full-page .dd-bs-page-btn:hover:not(.disabled):not(:disabled) {
    background: var(--dd-bs-glass-hover) !important;
    border-color: var(--dd-bs-accent) !important;
}

#dd-bookshelf-app .dd-bs-page-btn.active,
body.dd-bookshelf-full-page .dd-bs-page-btn.active {
    background: var(--dd-bs-accent-dark) !important;
    color: #fff !important;
    border-color: var(--dd-bs-accent-dark) !important;
}

#dd-bookshelf-app .dd-bs-page-btn:disabled,
#dd-bookshelf-app .dd-bs-page-btn.disabled,
body.dd-bookshelf-full-page .dd-bs-page-btn:disabled,
body.dd-bookshelf-full-page .dd-bs-page-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#dd-bookshelf-app .dd-bs-page-ellipsis,
body.dd-bookshelf-full-page .dd-bs-page-ellipsis {
    padding: 0 4px;
    color: var(--dd-bs-ink-light);
    font-size: 14px;
    user-select: none;
}

@media (max-width: 600px) {
    .dd-lb-close {
        top: calc(16px + env(safe-area-inset-top)) !important;
        inset-inline-end: calc(16px + env(safe-area-inset-right)) !important;
        width: 44px !important;
        height: 44px !important;
        font-size: 24px !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
    }
}