/* Processin Digital Books reader — Inter + site B/W/blue */

html[data-pdb-theme="light"],
html:not([data-pdb-theme]) {
    --pdb-bg: #f8fafc;
    --pdb-surface: #ffffff;
    --pdb-sidebar: #f1f5f9;
    --pdb-ink: #0f172a;
    --pdb-ink-2: #475569;
    --pdb-ink-3: #94a3b8;
    --pdb-border: rgba(15, 23, 42, 0.1);
    --pdb-accent: #2563eb;
    --pdb-accent-2: #1d4ed8;
    --pdb-hover: rgba(37, 99, 235, 0.08);
    --pdb-active: rgba(37, 99, 235, 0.12);
    --pdb-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
    --pdb-fade: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, #ffffff 88%);
    --pdb-callout-tip: #166534;
    --pdb-callout-tip-bg: #f0fdf4;
    --pdb-callout-prompt: #0f172a;
    --pdb-callout-prompt-bg: #f8fafc;
    --pdb-callout-example: #1e3a8a;
    --pdb-callout-example-bg: #eff6ff;
    --pdb-callout-important: #9a3412;
    --pdb-callout-important-bg: #fff7ed;
    --pdb-callout-warning: #b45309;
    --pdb-callout-warning-bg: #fffbeb;
    --pdb-callout-myth: #6b21a8;
    --pdb-callout-myth-bg: #faf5ff;
    --pdb-callout-checkpoint: #0f766e;
    --pdb-callout-checkpoint-bg: #f0fdfa;
    --pdb-callout-summary: #1e40af;
    --pdb-callout-summary-bg: #eef2ff;
    --pdb-callout-definition: #334155;
    --pdb-callout-definition-bg: #f1f5f9;
    --pdb-callout-template: #0369a1;
    --pdb-callout-template-bg: #f0f9ff;
    --pdb-btn-fg: #ffffff;
    color-scheme: light;
}

html[data-pdb-theme="dark"] {
    --pdb-bg: #0b1220;
    --pdb-surface: #111827;
    --pdb-sidebar: #0f172a;
    --pdb-ink: #e5e7eb;
    --pdb-ink-2: #94a3b8;
    --pdb-ink-3: #64748b;
    --pdb-border: rgba(148, 163, 184, 0.16);
    --pdb-accent: #60a5fa;
    --pdb-accent-2: #3b82f6;
    --pdb-hover: rgba(96, 165, 250, 0.12);
    --pdb-active: rgba(96, 165, 250, 0.18);
    --pdb-shadow: none;
    --pdb-fade: linear-gradient(180deg, rgba(17, 24, 39, 0) 0%, #111827 88%);
    --pdb-callout-tip: #86efac;
    --pdb-callout-tip-bg: rgba(22, 101, 52, 0.25);
    --pdb-callout-prompt: #e5e7eb;
    --pdb-callout-prompt-bg: rgba(15, 23, 42, 0.65);
    --pdb-callout-example: #93c5fd;
    --pdb-callout-example-bg: rgba(30, 58, 138, 0.35);
    --pdb-callout-important: #fdba74;
    --pdb-callout-important-bg: rgba(154, 52, 18, 0.28);
    --pdb-callout-warning: #fbbf24;
    --pdb-callout-warning-bg: rgba(180, 83, 9, 0.28);
    --pdb-callout-myth: #d8b4fe;
    --pdb-callout-myth-bg: rgba(107, 33, 168, 0.3);
    --pdb-callout-checkpoint: #5eead4;
    --pdb-callout-checkpoint-bg: rgba(15, 118, 110, 0.28);
    --pdb-callout-summary: #a5b4fc;
    --pdb-callout-summary-bg: rgba(30, 64, 175, 0.3);
    --pdb-callout-definition: #cbd5e1;
    --pdb-callout-definition-bg: rgba(51, 65, 85, 0.35);
    --pdb-callout-template: #7dd3fc;
    --pdb-callout-template-bg: rgba(3, 105, 161, 0.28);
    --pdb-btn-fg: #0b1220;
    color-scheme: dark;
}

html {
    --pdb-header-h: 64px;
    --pdb-sidebar-w: 300px;
    --pdb-read-w: 780px;
    --pdb-font-ui: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    --pdb-font-read: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    --pdb-font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    --pdb-fs: 18px;
    --pdb-lh: 1.75;
}

[data-pdb-width="narrow"] { --pdb-read-w: 640px; }
[data-pdb-width="medium"] { --pdb-read-w: 780px; }
[data-pdb-width="wide"] { --pdb-read-w: 920px; }

*, *::before, *::after { box-sizing: border-box; }

html, body.pdb-reader-page {
    margin: 0;
    height: 100%;
}

body.pdb-reader-page {
    font-family: var(--pdb-font-ui);
    background: var(--pdb-bg);
    color: var(--pdb-ink);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* Soft DRM on reading content; prompts + UI stay usable */
body.pdb-reader-page,
.pdb-r-article,
.pdb-r-body {
    -webkit-user-select: none;
    user-select: none;
}
body.pdb-reader-page input,
body.pdb-reader-page textarea,
body.pdb-reader-page button,
body.pdb-reader-page .pdb-prompt,
body.pdb-reader-page .pdb-prompt * {
    -webkit-user-select: text;
    user-select: text;
}

.pdb-r {
    display: grid;
    grid-template-rows: var(--pdb-header-h) 1fr;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    background: var(--pdb-bg);
}

.pdb-r-header {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0 1rem 0 0.75rem;
    border-bottom: 1px solid var(--pdb-border);
    background: color-mix(in srgb, var(--pdb-surface) 94%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 40;
    position: relative;
}

.pdb-r-header__brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
    text-decoration: none;
    color: inherit;
    flex: 1;
}

.pdb-r-header__cover {
    width: 28px;
    height: 40px;
    object-fit: cover;
    border-radius: 4px;
    border: 1px solid var(--pdb-border);
    flex-shrink: 0;
    background: var(--pdb-sidebar);
}

.pdb-r-header__meta {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.12rem;
}

.pdb-r-header__title {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
}

.pdb-r-header__progress-label {
    font-size: 0.7rem;
    color: var(--pdb-ink-3);
    font-weight: 500;
}

.pdb-r-header__track {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: transparent;
}
.pdb-r-header__track > i {
    display: block;
    height: 100%;
    background: var(--pdb-accent);
    width: 0;
}

.pdb-r-header__actions {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    flex-shrink: 0;
    position: relative;
}

.pdb-r-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid transparent;
    border-radius: 10px;
    background: transparent;
    color: var(--pdb-ink-2);
    cursor: pointer;
    transition: background 150ms ease, color 150ms ease;
}
.pdb-r-icon-btn:hover,
.pdb-r-icon-btn[aria-expanded="true"] {
    background: var(--pdb-hover);
    color: var(--pdb-accent);
}
.pdb-r-icon-btn:focus-visible {
    outline: 2px solid var(--pdb-accent);
    outline-offset: 2px;
}
.pdb-r-icon-btn svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}
/* Theme toggle: only one icon — never sun+moon side by side */
.pdb-r-icon-btn[data-pdb-theme-toggle] {
    position: relative;
}
.pdb-r-icon-btn[data-pdb-theme-toggle] svg[data-pdb-icon-sun],
.pdb-r-icon-btn[data-pdb-theme-toggle] svg[data-pdb-icon-moon] {
    display: none !important;
}
html[data-pdb-theme="light"] .pdb-r-icon-btn[data-pdb-theme-toggle] svg[data-pdb-icon-moon],
html:not([data-pdb-theme="dark"]) .pdb-r-icon-btn[data-pdb-theme-toggle] svg[data-pdb-icon-moon] {
    display: block !important;
}
html[data-pdb-theme="dark"] .pdb-r-icon-btn[data-pdb-theme-toggle] svg[data-pdb-icon-sun] {
    display: block !important;
}
html[data-pdb-theme="dark"] .pdb-r-icon-btn[data-pdb-theme-toggle] svg[data-pdb-icon-moon] {
    display: none !important;
}

.pdb-r-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    min-height: 36px;
    padding: 0 0.85rem;
    border-radius: 10px;
    border: 1px solid var(--pdb-border);
    background: transparent;
    color: var(--pdb-ink);
    font-family: var(--pdb-font-ui);
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
}
.pdb-r-btn:hover { background: var(--pdb-hover); }
.pdb-r-btn:focus-visible {
    outline: 2px solid var(--pdb-accent);
    outline-offset: 2px;
}
.pdb-r-btn--primary {
    background: var(--pdb-accent);
    border-color: var(--pdb-accent);
    color: #fff;
}
.pdb-r-btn--primary:hover {
    background: var(--pdb-accent-2);
    border-color: var(--pdb-accent-2);
    color: #fff;
}
.pdb-r-btn--ghost {
    border-color: transparent;
    color: var(--pdb-ink-2);
}
.pdb-r-btn--listen.is-playing {
    background: var(--pdb-hover);
    border-color: var(--pdb-accent);
    color: var(--pdb-accent);
}
.pdb-r-badge {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--pdb-accent);
    padding: 0.28rem 0.5rem;
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--pdb-accent) 35%, transparent);
    background: var(--pdb-hover);
    white-space: nowrap;
}

.pdb-r-shell {
    display: grid;
    grid-template-columns: var(--pdb-sidebar-w) minmax(0, 1fr);
    min-height: 0;
    height: 100%;
    transition: grid-template-columns 180ms ease;
}
.pdb-r.is-sidebar-collapsed .pdb-r-shell {
    grid-template-columns: 0 minmax(0, 1fr);
}
.pdb-r.is-sidebar-collapsed .pdb-r-sidebar {
    opacity: 0;
    pointer-events: none;
    border-right-width: 0;
}

.pdb-r-sidebar {
    background: var(--pdb-sidebar);
    border-right: 1px solid var(--pdb-border);
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    transition: opacity 160ms ease;
}

.pdb-r-sidebar__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 1rem 1rem 0.55rem;
}

.pdb-r-sidebar__heading {
    margin: 0;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--pdb-ink-3);
}

.pdb-r-sidebar__search {
    padding: 0 1rem 0.65rem;
}
.pdb-r-sidebar__search input {
    width: 100%;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--pdb-border);
    background: var(--pdb-surface);
    color: var(--pdb-ink);
    padding: 0 0.75rem;
    font-family: var(--pdb-font-ui);
    font-size: 0.8125rem;
}
.pdb-r-sidebar__search input::placeholder { color: var(--pdb-ink-3); }
.pdb-r-sidebar__search input:focus {
    outline: 2px solid color-mix(in srgb, var(--pdb-accent) 45%, transparent);
    outline-offset: 1px;
}
.pdb-r-sidebar__hint {
    margin: 0 1rem 0.65rem;
    font-size: 0.68rem;
    color: var(--pdb-ink-3);
    line-height: 1.35;
}

.pdb-r-toc {
    flex: 1;
    overflow: auto;
    padding: 0.25rem 0.6rem 1.5rem;
    overscroll-behavior: contain;
}

.pdb-r-toc__item {
    display: grid;
    grid-template-columns: 1.75rem minmax(0, 1fr);
    gap: 0.45rem;
    align-items: start;
    padding: 0.55rem 0.6rem;
    border-radius: 10px;
    color: var(--pdb-ink);
    text-decoration: none;
    font-size: 0.84rem;
    line-height: 1.35;
    transition: background 140ms ease, color 140ms ease;
}
.pdb-r-toc__item:hover { background: var(--pdb-hover); }
.pdb-r-toc__item.is-active {
    background: var(--pdb-active);
    color: var(--pdb-accent);
    font-weight: 600;
}
.pdb-r-toc__item.is-hidden { display: none; }
.pdb-r-toc__num {
    font-variant-numeric: tabular-nums;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--pdb-ink-3);
    padding-top: 0.12rem;
}
.pdb-r-toc__item.is-active .pdb-r-toc__num { color: var(--pdb-accent); }
.pdb-r-toc__title { overflow-wrap: anywhere; }

.pdb-r-main {
    min-width: 0;
    min-height: 0;
    overflow: auto;
    scroll-behavior: smooth;
    background: var(--pdb-surface);
}

.pdb-r-canvas {
    width: min(100%, calc(var(--pdb-read-w) + 5.5rem));
    margin: 0 auto;
    padding: 2.25rem 2.25rem 6rem;
}

.pdb-r-article {
    max-width: var(--pdb-read-w);
    margin: 0 auto;
}

.pdb-r-chapter-title {
    font-family: var(--pdb-font-read);
    font-size: clamp(1.45rem, 2vw, 1.85rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.25;
    margin: 0 0 1.35rem;
    color: var(--pdb-ink);
}

.pdb-r-body {
    font-family: var(--pdb-font-read);
    font-size: var(--pdb-fs);
    line-height: var(--pdb-lh);
    color: var(--pdb-ink);
}
.pdb-r-body > *:first-child { margin-top: 0; }
.pdb-r-body > h1:first-child { display: none; }

.pdb-r-body p { margin: 0 0 1.15em; }
.pdb-r-body h1,
.pdb-r-body h2,
.pdb-r-body h3 {
    font-family: var(--pdb-font-read);
    letter-spacing: -0.02em;
    line-height: 1.25;
    color: var(--pdb-ink);
}
.pdb-r-body h1 { font-size: 1.35em; margin: 1.5em 0 0.5em; font-weight: 700; }
.pdb-r-body h2 { font-size: 1.2em; margin: 1.4em 0 0.45em; font-weight: 700; }
.pdb-r-body h3 { font-size: 1.08em; margin: 1.25em 0 0.4em; font-weight: 650; }
.pdb-r-body ul,
.pdb-r-body ol {
    margin: 0 0 1.15em;
    padding-left: 1.3em;
}
.pdb-r-body li { margin: 0.3em 0; }
.pdb-r-body a { color: var(--pdb-accent); }
.pdb-r-body mark.pdb-find-hit {
    background: color-mix(in srgb, var(--pdb-accent) 28%, transparent);
    color: inherit;
    border-radius: 2px;
    padding: 0 0.1em;
}

.pdb-part-label {
    font-family: var(--pdb-font-ui);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--pdb-ink-3);
    margin: 0 0 1rem;
}

.pdb-chapter-subtitle {
    font-style: italic;
    color: var(--pdb-ink-2);
    margin: -0.4rem 0 1.15rem;
}

.pdb-callout {
    position: relative;
    margin: 1.4em 0;
    padding: 1rem 1.1rem;
    border-radius: 12px;
    border: 1px solid var(--pdb-border);
    border-left: 3px solid var(--pdb-accent);
    background: var(--pdb-callout-prompt-bg);
    font-family: var(--pdb-font-ui);
    font-size: 0.95em;
    line-height: 1.55;
}
.pdb-callout__title {
    font-weight: 700;
    margin-bottom: 0.35rem;
}
.pdb-callout--tip {
    border-left-color: var(--pdb-callout-tip);
    background: var(--pdb-callout-tip-bg);
    color: var(--pdb-callout-tip);
}
.pdb-callout--prompt,
.pdb-callout--example-prompt {
    border-left-color: var(--pdb-accent);
    background: var(--pdb-callout-prompt-bg);
    color: var(--pdb-callout-prompt);
}
.pdb-callout--example {
    border-left-color: var(--pdb-callout-example);
    background: var(--pdb-callout-example-bg);
    color: var(--pdb-callout-example);
}
.pdb-callout--important {
    border-left-color: var(--pdb-callout-important);
    background: var(--pdb-callout-important-bg);
    color: var(--pdb-callout-important);
}
.pdb-callout--warning {
    border-left-color: var(--pdb-callout-warning);
    background: var(--pdb-callout-warning-bg);
    color: var(--pdb-callout-warning);
}
.pdb-callout--myth {
    border-left-color: var(--pdb-callout-myth);
    background: var(--pdb-callout-myth-bg);
    color: var(--pdb-callout-myth);
}
.pdb-callout--checkpoint {
    border-left-color: var(--pdb-callout-checkpoint);
    background: var(--pdb-callout-checkpoint-bg);
    color: var(--pdb-callout-checkpoint);
}
.pdb-callout--summary {
    border-left-color: var(--pdb-callout-summary);
    background: var(--pdb-callout-summary-bg);
    color: var(--pdb-callout-summary);
}
.pdb-callout--definition {
    border-left-color: var(--pdb-callout-definition);
    background: var(--pdb-callout-definition-bg);
    color: var(--pdb-callout-definition);
}
.pdb-callout--template {
    border-left-color: var(--pdb-callout-template);
    background: var(--pdb-callout-template-bg);
    color: var(--pdb-callout-template);
}
.pdb-callout--note {
    border-left-color: var(--pdb-accent);
    background: var(--pdb-callout-prompt-bg);
    color: var(--pdb-ink);
}
.pdb-callout__body {
    color: var(--pdb-ink-2);
}
.pdb-callout__body strong {
    color: inherit;
}

.pdb-prompt {
    margin: 0.45rem 0 0;
    padding: 0.85rem 1rem;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: var(--pdb-font-mono);
    font-size: 0.84em;
    line-height: 1.55;
    color: var(--pdb-ink, #0f172a);
    background: var(--pdb-surface, #ffffff);
    border: 1px solid var(--pdb-border, rgba(15, 23, 42, 0.1));
    border-radius: 10px;
    overflow-x: auto;
}

.pdb-prompt-wrap {
    position: relative;
}
.pdb-prompt-copy {
    position: absolute;
    top: 0.45rem;
    right: 0.45rem;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    min-height: 30px;
    padding: 0 0.55rem;
    border-radius: 8px;
    border: 1px solid var(--pdb-border);
    background: var(--pdb-surface);
    color: var(--pdb-ink-2);
    font-family: var(--pdb-font-ui);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
}
.pdb-prompt-copy:hover {
    color: var(--pdb-accent);
    border-color: color-mix(in srgb, var(--pdb-accent) 40%, transparent);
}
.pdb-prompt-copy.is-copied {
    color: #16a34a;
    border-color: color-mix(in srgb, #16a34a 40%, transparent);
}
.pdb-prompt-copy svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.8;
}

.pdb-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25em 0;
    font-family: var(--pdb-font-ui);
    font-size: 0.9em;
    border: 1px solid var(--pdb-border);
    border-radius: 12px;
    overflow: hidden;
}
.pdb-table th,
.pdb-table td {
    border-bottom: 1px solid var(--pdb-border);
    padding: 0.65rem 0.75rem;
    text-align: left;
    vertical-align: top;
}
.pdb-table th {
    background: var(--pdb-hover);
    font-weight: 700;
}
.pdb-table tr:last-child td { border-bottom: 0; }

.pdb-r-pager {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--pdb-border);
    font-family: var(--pdb-font-ui);
}
.pdb-r-pager a,
.pdb-r-pager span {
    max-width: 46%;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--pdb-accent);
    text-decoration: none;
    line-height: 1.35;
}
.pdb-r-pager a:hover { text-decoration: underline; }
.pdb-r-pager span.is-disabled { color: var(--pdb-ink-3); }

.pdb-r-lock {
    position: relative;
    margin-top: 2.25rem;
    padding-top: 3.25rem;
}
.pdb-r-lock::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: -4.5rem;
    height: 5.5rem;
    background: var(--pdb-fade);
    pointer-events: none;
}
.pdb-r-lock__inner {
    text-align: center;
    padding: 1.5rem 1.1rem 0.35rem;
    border-top: 1px solid var(--pdb-border);
}
.pdb-r-lock__icon {
    width: 40px;
    height: 40px;
    margin: 0 auto 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--pdb-border);
    display: grid;
    place-items: center;
    color: var(--pdb-accent);
}
.pdb-r-lock__icon svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.7;
}
.pdb-r-lock__title {
    font-family: var(--pdb-font-ui);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 0.5rem;
}
.pdb-r-lock__text {
    margin: 0 auto 1.2rem;
    max-width: 34rem;
    color: var(--pdb-ink-2);
    font-size: 0.92rem;
    line-height: 1.55;
}
.pdb-r-lock__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    justify-content: center;
}

.pdb-r-popover {
    position: absolute;
    top: calc(100% + 0.4rem);
    right: 0;
    width: min(300px, calc(100vw - 1.5rem));
    background: var(--pdb-surface);
    border: 1px solid var(--pdb-border);
    border-radius: 12px;
    box-shadow: 0 14px 36px rgba(15, 23, 42, 0.14);
    padding: 0.95rem;
    z-index: 60;
    display: none;
}
.pdb-r-popover.is-open { display: block; }
.pdb-r-popover__title {
    margin: 0 0 0.75rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--pdb-ink-3);
}
.pdb-r-field { margin-bottom: 0.8rem; }
.pdb-r-field label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--pdb-ink-2);
    margin-bottom: 0.35rem;
}
.pdb-r-seg {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    gap: 0.25rem;
    padding: 0.22rem;
    border-radius: 10px;
    background: var(--pdb-hover);
}
.pdb-r-seg button {
    border: 0;
    background: transparent;
    color: var(--pdb-ink-2);
    font-family: var(--pdb-font-ui);
    font-size: 0.76rem;
    font-weight: 600;
    min-height: 30px;
    border-radius: 8px;
    cursor: pointer;
}
.pdb-r-seg button.is-active {
    background: var(--pdb-surface);
    color: var(--pdb-ink);
    box-shadow: var(--pdb-shadow);
}

.pdb-r-mobile-bar {
    display: none;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 45;
    padding: 0.5rem 0.7rem calc(0.5rem + env(safe-area-inset-bottom));
    background: color-mix(in srgb, var(--pdb-surface) 94%, transparent);
    border-top: 1px solid var(--pdb-border);
    backdrop-filter: blur(10px);
    gap: 0.35rem;
    justify-content: space-between;
    align-items: center;
}

.pdb-r-scrim {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    z-index: 35;
}
.pdb-r-scrim.is-open { display: block; }

.pdb-r__audio { display: none; }

/* Focus / fullscreen mode */
html.is-pdb-fullscreen .pdb-r-header,
html.is-pdb-fullscreen .pdb-r-sidebar,
html.is-pdb-fullscreen .pdb-r-mobile-bar,
body.is-fullscreen .pdb-r-header,
body.is-fullscreen .pdb-r-sidebar,
body.is-fullscreen .pdb-r-mobile-bar {
    display: none !important;
}
html.is-pdb-fullscreen .pdb-r,
body.is-fullscreen .pdb-r {
    grid-template-rows: 1fr;
}
html.is-pdb-fullscreen .pdb-r-shell,
body.is-fullscreen .pdb-r-shell {
    grid-template-columns: 1fr;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition: none !important;
        scroll-behavior: auto !important;
    }
}

@media (max-width: 1024px) {
    .pdb-r-shell { grid-template-columns: 1fr; }
    .pdb-r-sidebar {
        position: fixed;
        top: var(--pdb-header-h);
        left: 0;
        bottom: 0;
        width: min(320px, 88vw);
        z-index: 38;
        transform: translateX(-105%);
        transition: transform 180ms ease;
        opacity: 1;
        pointer-events: auto;
        box-shadow: 8px 0 28px rgba(15, 23, 42, 0.12);
    }
    .pdb-r.is-toc-open .pdb-r-sidebar { transform: translateX(0); }
    .pdb-r.is-sidebar-collapsed .pdb-r-shell { grid-template-columns: 1fr; }
    .pdb-r.is-sidebar-collapsed .pdb-r-sidebar { opacity: 1; }
    .pdb-r-canvas { padding: 1.75rem 1.35rem 5.5rem; }
}

@media (max-width: 768px) {
    .pdb-r-header__progress-label,
    .pdb-r-badge,
    .pdb-r-btn--desktop-label { display: none; }
    .pdb-r-header__title { font-size: 0.82rem; }
    .pdb-r-canvas { padding: 1.35rem 1rem 6.5rem; }
    .pdb-r-body { font-size: calc(var(--pdb-fs) - 1px); }
    .pdb-r-mobile-bar { display: flex; }
}

/* Visible watermark overlay removed — kept empty so old cached HTML does nothing. */
.pdb-r-watermark { display: none !important; }

.pdb-r-session-block {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    background: color-mix(in srgb, var(--pdb-bg) 72%, transparent);
    backdrop-filter: blur(6px);
}
.pdb-r-session-block[hidden] { display: none !important; }
.pdb-r-session-block__card {
    max-width: 420px;
    width: 100%;
    background: var(--pdb-surface);
    border: 1px solid var(--pdb-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
}
.pdb-r-session-block__card h2 {
    margin: 0 0 0.55rem;
    font-size: 1.1rem;
    color: var(--pdb-ink);
}
.pdb-r-session-block__card p {
    margin: 0 0 1.1rem;
    color: var(--pdb-ink-2);
    line-height: 1.55;
    font-size: 0.95rem;
}
.pdb-r-session-block__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

@media print {
    .pdb-r-header,
    .pdb-r-sidebar,
    .pdb-r-mobile-bar,
    .pdb-r-lock,
    .pdb-r-popover,
    .pdb-r-scrim,
    .pdb-prompt-copy { display: none !important; }
    .pdb-r, .pdb-r-shell, .pdb-r-main { height: auto; overflow: visible; }
    .pdb-r-shell { grid-template-columns: 1fr; }
}