:root {
    --clarity-reader-navy: #0f172a;
    --clarity-reader-blue: #2563eb;
    --clarity-reader-blue-soft: #eff6ff;
    --clarity-reader-border: #dbe3ef;
    --clarity-reader-muted: #64748b;
    --clarity-reader-surface: rgba(255, 255, 255, 0.96);
    --clarity-reader-shadow: 0 18px 45px rgba(15, 23, 42, 0.1);
}

.article-shell[data-reader-tier] {
    max-width: 1192px;
}

.article-shell[data-reader-tier] .article-header {
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.article-reading-layout {
    min-width: 0;
}

.article-reading-layout > .article-content {
    min-width: 0;
}

.article-content h2[id],
.article-content h3[id] {
    scroll-margin-top: 104px;
}

.clarity-reader-progress {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1100;
    height: 3px;
    pointer-events: none;
    background: transparent;
}

.clarity-reader-progress__fill {
    display: block;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, #2563eb, #4f46e5);
    transform-origin: left center;
}

.clarity-reader-nav {
    color: var(--clarity-reader-navy);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.clarity-reader-nav__details {
    overflow: hidden;
    border: 1px solid var(--clarity-reader-border);
    border-radius: 18px;
    background: var(--clarity-reader-surface);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.07);
}

.clarity-reader-nav__summary {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 16px;
    cursor: pointer;
    list-style-position: inside;
    user-select: none;
}

.clarity-reader-nav__summary:hover {
    background: #f8fafc;
}

.clarity-reader-nav__summary:focus-visible,
.clarity-reader-nav a:focus-visible,
.clarity-reader-nav button:focus-visible,
.clarity-reader-nav input:focus-visible,
.clarity-reader-fab:focus-visible,
.clarity-reader-dialog button:focus-visible,
.clarity-reader-dialog a:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.3);
    outline-offset: 2px;
}

.clarity-reader-nav__summary strong,
.clarity-reader-nav__summary small {
    display: block;
}

.clarity-reader-nav__lead {
    min-width: 0;
    display: flex;
    align-items: center;
}

.clarity-reader-nav__summary strong {
    margin-bottom: 2px;
    font-size: 0.98rem;
    line-height: 1.25;
}

.clarity-reader-nav__summary small {
    color: var(--clarity-reader-muted);
    font-size: 0.76rem;
    font-weight: 650;
}

.clarity-reader-nav__mobile-meta {
    display: none;
}

.clarity-reader-nav__open-icon {
    width: 36px;
    height: 36px;
    display: none;
    flex: 0 0 36px;
    place-items: center;
    margin-right: 11px;
    border: 1px solid #60a5fa;
    border-radius: 10px;
    background: #eff6ff;
    color: #1d4ed8;
    box-shadow: 0 3px 10px rgba(37, 99, 235, 0.14);
}

.clarity-reader-nav__open-icon::before {
    width: 18px;
    height: 18px;
    content: '';
    background: currentColor;
    -webkit-mask: url('/assets/icons/ui/lucide-plus.svg') center / contain no-repeat;
    mask: url('/assets/icons/ui/lucide-plus.svg') center / contain no-repeat;
}

.clarity-reader-nav__body {
    padding: 0 12px 14px;
    border-top: 1px solid #edf2f7;
}

.clarity-reader-nav__search {
    display: block;
    padding: 12px 4px 10px;
}

.clarity-reader-nav__search span {
    display: block;
    margin: 0 0 6px;
    color: #475569;
    font-size: 0.75rem;
    font-weight: 700;
}

.clarity-reader-nav__search input {
    width: 100%;
    min-height: 42px;
    padding: 9px 11px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: #fff;
    color: #0f172a;
    font: inherit;
    font-size: 0.86rem;
}

.clarity-reader-nav__search input::placeholder {
    color: #94a3b8;
}

.clarity-toc-list,
.clarity-toc-sublist {
    margin: 0;
    padding: 0;
    list-style: none;
}

.clarity-toc-list {
    display: grid;
    gap: 2px;
}

.clarity-toc-item[hidden],
.clarity-toc-sublist li[hidden] {
    display: none !important;
}

.clarity-toc-row {
    display: flex;
    align-items: flex-start;
    gap: 6px;
}

.clarity-toc-row > a {
    flex: 1 1 auto;
    min-width: 0;
    padding-left: 4px;
}

.clarity-reader-nav a,
.clarity-reader-dialog__content a {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    padding: 9px 8px;
    border-radius: 10px;
    color: #334155;
    font-size: 0.84rem;
    font-weight: 600;
    line-height: 1.38;
    text-decoration: none;
}

.clarity-reader-nav a:hover,
.clarity-reader-dialog__content a:hover {
    background: #f8fafc;
    color: #0f172a;
}

.clarity-reader-nav a[aria-current="location"],
.clarity-reader-dialog__content a[aria-current="location"] {
    background: var(--clarity-reader-blue-soft);
    color: #1d4ed8;
    font-weight: 750;
}

.clarity-toc-number {
    width: 22px;
    height: 22px;
    display: inline-flex;
    flex: 0 0 22px;
    align-items: center;
    justify-content: center;
    margin-top: 6px;
    padding: 0;
    border-radius: 6px;
    background: #f1f5f9;
    color: #64748b;
    font-size: 0.69rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.03em;
}

.clarity-toc-row.is-current .clarity-toc-number {
    background: #2563eb;
    color: #fff;
}

.clarity-toc-subtopics {
    display: none;
    width: 26px;
    height: 26px;
    flex: 0 0 26px;
    margin-top: 4px;
    padding: 0;
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    background: #f8fbff;
    color: #2563eb;
    cursor: pointer;
}

.clarity-toc-subtopics-spacer {
    width: 26px;
    height: 26px;
    flex: 0 0 26px;
    margin-top: 4px;
}

.clarity-reader-enhanced .clarity-toc-subtopics {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.clarity-toc-subtopics__icon {
    width: 12px;
    height: 12px;
    display: block;
    background: currentColor;
    -webkit-mask: url('/assets/icons/ui/lucide-plus.svg') center / contain no-repeat;
    mask: url('/assets/icons/ui/lucide-plus.svg') center / contain no-repeat;
}

.clarity-toc-subtopics[aria-expanded="true"] .clarity-toc-subtopics__icon {
    -webkit-mask-image: url('/assets/icons/ui/lucide-minus.svg');
    mask-image: url('/assets/icons/ui/lucide-minus.svg');
}

.clarity-toc-subtopics:hover,
.clarity-toc-subtopics[aria-expanded="true"] {
    border-color: #93c5fd;
    background: #eff6ff;
    color: #1e40af;
}

.clarity-reader-enhanced .clarity-toc-sublist {
    display: none;
}

.clarity-reader-enhanced .clarity-toc-item.is-subtopics-open > .clarity-toc-sublist {
    display: block;
}

.clarity-toc-sublist {
    margin: 0 0 4px 45px;
    padding-left: 26px;
    border-left: 1px solid #cbd5e1;
}

.clarity-toc-sublist a {
    padding: 7px 8px;
    color: #64748b;
    font-size: 0.78rem;
    font-weight: 550;
}

.clarity-reader-nav__empty {
    margin: 12px 6px 4px;
    color: #64748b;
    font-size: 0.82rem;
    line-height: 1.5;
}

.clarity-reader-fab {
    position: fixed;
    right: 14px;
    bottom: calc(84px + env(safe-area-inset-bottom));
    z-index: 80;
    display: none;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    max-width: min(245px, calc(100vw - 28px));
    padding: 9px 12px;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 999px;
    background: #172554;
    color: #fff;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.28);
    cursor: pointer;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.78rem;
    font-weight: 750;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}

.clarity-reader-fab.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.clarity-reader-fab__label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.clarity-reader-fab__position {
    flex: 0 0 auto;
    padding-left: 8px;
    border-left: 1px solid rgba(255, 255, 255, 0.24);
    color: #dbeafe;
    font-variant-numeric: tabular-nums;
}

.clarity-reader-dialog {
    width: min(560px, 100%);
    max-width: none;
    max-height: min(78vh, 760px);
    margin: auto 0 0 auto;
    padding: 0;
    border: 0;
    border-radius: 22px 22px 0 0;
    background: #fff;
    color: #0f172a;
    box-shadow: 0 -24px 70px rgba(15, 23, 42, 0.28);
}

.clarity-reader-dialog::backdrop {
    background: rgba(15, 23, 42, 0.58);
    backdrop-filter: blur(3px);
}

.clarity-reader-dialog__frame {
    display: flex;
    max-height: min(78vh, 760px);
    flex-direction: column;
}

.clarity-reader-dialog__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 18px 13px;
    border-bottom: 1px solid #e2e8f0;
}

.clarity-reader-dialog__header strong,
.clarity-reader-dialog__header small {
    display: block;
}

.clarity-reader-dialog__header strong {
    font-size: 1rem;
}

.clarity-reader-dialog__header small {
    margin-top: 2px;
    color: #64748b;
    font-size: 0.76rem;
}

.clarity-reader-dialog__close {
    min-width: 58px;
    min-height: 40px;
    padding: 8px 11px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: #fff;
    color: #334155;
    cursor: pointer;
    font: inherit;
    font-size: 0.8rem;
    font-weight: 700;
}

.clarity-reader-dialog__content {
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 4px 10px 14px;
}

.clarity-reader-dialog__content .clarity-reader-nav__body {
    padding-top: 0;
    border-top: 0;
}

.clarity-reader-dialog__footer {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    padding: 12px 14px calc(12px + env(safe-area-inset-bottom));
    border-top: 1px solid #e2e8f0;
    background: #fff;
}

.clarity-reader-dialog__footer a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 10px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    color: #1e3a8a;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.8rem;
    font-weight: 750;
    text-align: center;
    text-decoration: none;
}

.clarity-reader-dialog__footer a[aria-disabled="true"] {
    opacity: 0.46;
    pointer-events: none;
}

body.clarity-reader-dialog-open {
    overflow: hidden;
}

@media (min-width: 1180px) {
    .article-shell[data-reader-tier="full"] .article-reading-layout,
    .article-shell[data-reader-tier="guided"] .article-reading-layout {
        display: grid;
        grid-template-columns: minmax(260px, 302px) minmax(0, 812px);
        align-items: start;
        justify-content: center;
        gap: 30px;
    }

    .article-shell[data-reader-tier="full"] .clarity-reader-nav,
    .article-shell[data-reader-tier="guided"] .clarity-reader-nav {
        position: sticky;
        top: 92px;
        max-height: calc(100vh - 112px);
    }

    .article-shell[data-reader-tier="full"] .clarity-reader-nav__details,
    .article-shell[data-reader-tier="guided"] .clarity-reader-nav__details {
        max-height: inherit;
        display: flex;
        flex-direction: column;
    }

    .article-shell[data-reader-tier="full"] .clarity-reader-nav__body,
    .article-shell[data-reader-tier="guided"] .clarity-reader-nav__body {
        overflow-y: auto;
        overscroll-behavior: contain;
        scrollbar-width: thin;
    }

    .article-shell[data-reader-tier="compact"] {
        max-width: 860px;
    }

    .article-shell[data-reader-tier="compact"] .clarity-reader-nav {
        margin-bottom: 20px;
    }
}

@media (max-width: 1179px) {
    .article-shell[data-reader-tier] {
        max-width: 860px;
    }

    .clarity-reader-nav {
        margin: 0 0 20px;
    }

    .clarity-reader-nav__details:not([open]) .clarity-reader-nav__summary {
        border-bottom: 0;
    }

    .clarity-reader-nav__details {
        border-color: #bfdbfe;
    }

    .clarity-reader-nav__summary {
        justify-content: flex-start;
        background: linear-gradient(135deg, #ffffff 0%, #f8fbff 100%);
    }

    .clarity-reader-nav__summary:hover {
        background: #f0f7ff;
    }

    .clarity-reader-nav__desktop-meta {
        display: none;
    }

    .clarity-reader-nav__mobile-meta {
        display: inline;
    }

    .clarity-reader-nav__open-icon {
        display: inline-grid;
    }

    .clarity-reader-fab {
        display: inline-flex;
        bottom: calc(18px + env(safe-area-inset-bottom));
    }
}

@media (max-width: 768px) {
    .article-content h2[id],
    .article-content h3[id] {
        scroll-margin-top: 82px;
    }

    .clarity-reader-nav {
        margin: 0 0 16px;
    }

    .clarity-reader-nav__details {
        border-radius: 14px;
    }

    .clarity-reader-nav__summary {
        min-height: 62px;
        padding: 12px 14px;
    }

    .clarity-reader-nav__body {
        max-height: 58vh;
        overflow-y: auto;
        overscroll-behavior: contain;
    }

    .clarity-reader-dialog__content a {
        align-items: flex-start;
        gap: 7px;
        padding: 8px;
        font-size: 0.9375rem;
        font-weight: 500;
        line-height: 1.4;
    }

    .clarity-reader-dialog__content a[aria-current="location"] {
        font-weight: 700;
    }

    .clarity-reader-dialog__content .clarity-toc-sublist a {
        padding: 6px 8px;
        color: #64748b;
        font-size: 0.875rem;
        font-weight: 500;
        line-height: 1.45;
    }

    .clarity-reader-dialog__content .clarity-toc-number {
        height: 26px;
        display: inline-flex;
        flex: 0 0 26px;
        align-items: center;
        justify-content: center;
        margin-top: 6px;
        padding: 0;
        border-radius: 7px;
        background: #f1f5f9;
        color: #475569;
        font-size: 0.72rem;
        font-weight: 700;
        letter-spacing: 0;
    }

    .clarity-reader-dialog__content .clarity-toc-row.is-current .clarity-toc-number {
        background: #2563eb;
        color: #fff;
    }

    .clarity-reader-fab {
        bottom: calc(84px + env(safe-area-inset-bottom));
    }
}

@media (max-width: 420px) {
    .clarity-reader-dialog {
        width: 100%;
    }

    .clarity-reader-fab {
        max-width: 205px;
    }
}

/* The existing desktop header keeps its dropdowns in layout while closed.
   Contain the final menu at the tablet breakpoint so reviewed articles never
   acquire the header's 18px horizontal page overflow. */
@media (min-width: 901px) and (max-width: 1100px) {
    .header-nav .nav-item:last-child .dropdown {
        right: 0 !important;
        left: auto !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    html:focus-within {
        scroll-behavior: auto;
    }

    .clarity-reader-fab,
    .clarity-reader-dialog {
        transition: none;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --clarity-reader-navy: #e2e8f0;
        --clarity-reader-blue-soft: rgba(37, 99, 235, 0.2);
        --clarity-reader-border: #334155;
        --clarity-reader-muted: #94a3b8;
        --clarity-reader-surface: rgba(15, 23, 42, 0.96);
    }

    .clarity-reader-nav__summary:hover,
    .clarity-reader-nav a:hover,
    .clarity-toc-subtopics:hover,
    .clarity-toc-subtopics[aria-expanded="true"] {
        background: #1e293b;
    }

    .clarity-reader-nav__body,
    .clarity-reader-dialog__header,
    .clarity-reader-dialog__footer {
        border-color: #334155;
    }

    .clarity-reader-nav__search input,
    .clarity-reader-dialog,
    .clarity-reader-dialog__footer,
    .clarity-reader-dialog__close {
        border-color: #475569;
        background: #0f172a;
        color: #e2e8f0;
    }

    .clarity-reader-nav a,
    .clarity-reader-dialog__content a,
    .clarity-reader-dialog__footer a {
        color: #cbd5e1;
    }

    .clarity-reader-nav a[aria-current="location"],
    .clarity-reader-dialog__content a[aria-current="location"] {
        color: #93c5fd;
    }

    .clarity-reader-nav__summary {
        background: #0f172a;
    }

    .clarity-reader-nav__open-icon {
        border-color: #3b82f6;
        background: #172554;
        color: #93c5fd;
    }

    .clarity-toc-subtopics {
        border-color: #475569;
        background: #0f172a;
        color: #93c5fd;
    }

    .clarity-toc-number {
        color: #94a3b8;
    }

    .clarity-reader-dialog__content .clarity-toc-number {
        background: #1e293b;
        color: #cbd5e1;
    }

    .clarity-toc-row.is-current .clarity-toc-number {
        color: #fff;
    }

    .clarity-reader-dialog__content .clarity-toc-row.is-current .clarity-toc-number {
        background: #2563eb;
    }
}