.bb-study-reading {
    width: min(96vw, 90rem);
    height: min(94dvh, 64rem);
    max-width: none;
    max-height: none;
    margin: auto;
    padding: 0;
    border: 1px solid color-mix(in srgb, var(--bb-color-border-subtle, #cbd5e1) 78%, transparent);
    border-radius: 1rem;
    background: var(--bb-color-bg-panel, #fff);
    color: var(--bb-color-text-primary, #172033);
    box-shadow: 0 1.5rem 5rem rgb(15 23 42 / 28%);
    overflow: hidden;
}

.bb-study-reading::backdrop {
    background: rgb(15 23 42 / 54%);
    backdrop-filter: blur(2px);
}

.bb-study-reading__shell {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    height: 100%;
    min-height: 0;
}

.bb-study-reading__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.1rem clamp(1rem, 3vw, 2.25rem);
    border-bottom: 1px solid var(--bb-color-border-subtle, #dbe2ea);
    background: var(--bb-color-bg-panel, #fff);
}

.bb-study-reading__heading {
    min-width: 0;
}

.bb-study-reading__eyebrow {
    margin: 0 0 .2rem;
    color: var(--bb-color-text-muted, #64748b);
    font-size: .72rem;
    font-weight: 750;
    letter-spacing: .11em;
    text-transform: uppercase;
}

.bb-study-reading__title {
    margin: 0;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    line-height: 1.12;
    overflow-wrap: anywhere;
}

.bb-study-reading__subtitle {
    margin: .35rem 0 0;
    color: var(--bb-color-text-secondary, #526174);
    font-size: 1rem;
    white-space: pre-wrap;
}

.bb-study-reading__storage {
    margin: .45rem 0 0;
    color: var(--bb-color-text-secondary, #526174);
    font-size: .78rem;
    line-height: 1.35;
}

.bb-study-reading__header-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: .5rem;
    flex: 0 0 auto;
}

.bb-study-reading__layout {
    display: grid;
    grid-template-columns: minmax(10rem, 15rem) minmax(0, 1fr);
    min-height: 0;
    overflow: hidden;
}

.bb-study-reading__layout:has(.bb-study-reading__preview:not([hidden])) {
    grid-template-columns: minmax(10rem, 14rem) minmax(0, 1fr) minmax(18rem, 25rem);
}

.bb-study-reading__nav {
    min-width: 0;
    padding: 1.1rem .75rem;
    border-right: 1px solid var(--bb-color-border-subtle, #dbe2ea);
    background: color-mix(in srgb, var(--bb-color-bg-panel, #fff) 90%, var(--bb-color-accent-primary, #2563eb) 10%);
    overflow: auto;
    overscroll-behavior: contain;
}

.bb-study-reading__nav-list {
    display: grid;
    gap: .25rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.bb-study-reading__nav-button {
    width: 100%;
    padding: .55rem .65rem;
    border: 0;
    border-radius: .55rem;
    background: transparent;
    color: inherit;
    font: inherit;
    font-size: .86rem;
    line-height: 1.3;
    text-align: left;
    cursor: pointer;
}

.bb-study-reading__nav-button:hover,
.bb-study-reading__nav-button:focus-visible,
.bb-study-reading__nav-button[aria-current="true"] {
    background: var(--bb-color-bg-panel, #fff);
    outline: none;
    box-shadow: inset 3px 0 0 var(--bb-color-accent-primary, #2563eb);
}

.bb-study-reading__content {
    min-width: 0;
    padding: clamp(1.25rem, 4vw, 3.5rem) clamp(1rem, 5vw, 4.5rem) 5rem;
    overflow: auto;
    overscroll-behavior: contain;
    scroll-behavior: smooth;
    scroll-padding-top: 1.5rem;
}

.bb-study-reading__empty {
    max-width: 38rem;
    margin: 12vh auto 0;
    color: var(--bb-color-text-secondary, #526174);
    font: 1.12rem/1.7 Georgia, "Times New Roman", serif;
    text-align: center;
}

.bb-study-reading__section {
    max-width: 52rem;
    margin: 0 auto clamp(3.5rem, 9vh, 7rem);
    padding: 0;
    scroll-margin-top: 1rem;
}

.bb-study-reading__section:focus {
    outline: none;
}

.bb-study-reading__section:focus .bb-study-reading__section-title {
    color: var(--bb-color-accent-primary-strong, #244b70);
    text-decoration: underline;
    text-decoration-thickness: .12em;
    text-underline-offset: .3em;
}

.bb-study-reading__section-title {
    margin: 0 0 1rem;
    color: var(--bb-color-text-secondary, #526174);
    font-size: clamp(.82rem, 1.5vw, .95rem);
    font-weight: 750;
    letter-spacing: .08em;
    line-height: 1.3;
    text-transform: uppercase;
}

.bb-study-reading__source-meta {
    display: flex;
    flex-wrap: wrap;
    gap: .35rem;
    margin: -.45rem 0 1rem;
}

.bb-study-reading__source-chip {
    padding: .24rem .5rem;
    border: 1px solid var(--bb-color-border-subtle, #dbe2ea);
    border-radius: 999px;
    color: var(--bb-color-text-secondary, #526174);
    font-size: .72rem;
    line-height: 1.25;
}

.bb-study-reading-copy {
    font: clamp(1.05rem, 1.7vw, 1.25rem)/1.72 Georgia, "Times New Roman", serif;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
}

.bb-study-reading__ref {
    background: transparent;
    color: inherit;
    font: inherit;
    cursor: pointer;
}

.bb-study-reading__preview {
    min-width: 0;
    padding: 1.1rem;
    border-left: 1px solid var(--bb-color-border-subtle, #dbe2ea);
    background: color-mix(in srgb, var(--bb-color-bg-panel, #fff) 94%, var(--bb-color-accent-primary, #2563eb) 6%);
    overflow: auto;
    overscroll-behavior: contain;
}

.bb-study-reading__preview-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.bb-study-reading__preview-title {
    margin: 0;
    font: 700 1.15rem/1.3 Georgia, "Times New Roman", serif;
}

.bb-study-reading__preview-close {
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: 1px solid var(--bb-color-border-subtle, #dbe2ea);
    border-radius: 50%;
    background: var(--bb-color-bg-panel, #fff);
    color: inherit;
    font: 1.25rem/1 sans-serif;
    cursor: pointer;
}

.bb-study-reading__preview-meta {
    margin: .35rem 0 1rem;
    color: var(--bb-color-text-secondary, #526174);
    font-size: .78rem;
}

.bb-study-reading__preview-body {
    font: 1rem/1.65 Georgia, "Times New Roman", serif;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.bb-study-reading__preview-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin-top: 1.25rem;
}

.bb-study-reading__footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    padding: .7rem 1rem;
    border-top: 1px solid var(--bb-color-border-subtle, #dbe2ea);
    background: var(--bb-color-bg-panel, #fff);
}

.bb-study-reading__position {
    min-width: 5.5rem;
    color: var(--bb-color-text-secondary, #526174);
    font-size: .78rem;
    text-align: center;
}

@media (max-width: 62rem) {
    .bb-study-reading {
        width: 100vw;
        height: 100dvh;
        border: 0;
        border-radius: 0;
    }

    .bb-study-reading__layout,
    .bb-study-reading__layout:has(.bb-study-reading__preview:not([hidden])) {
        grid-template-columns: 1fr;
        grid-template-rows: auto minmax(0, 1fr);
    }

    .bb-study-reading__nav {
        display: flex;
        padding: .55rem .75rem;
        border-right: 0;
        border-bottom: 1px solid var(--bb-color-border-subtle, #dbe2ea);
        overflow-x: auto;
        overflow-y: hidden;
    }

    .bb-study-reading__nav-list {
        display: flex;
        width: max-content;
    }

    .bb-study-reading__nav-button {
        width: auto;
        white-space: nowrap;
    }

    .bb-study-reading__nav-button:hover,
    .bb-study-reading__nav-button:focus-visible,
    .bb-study-reading__nav-button[aria-current="true"] {
        box-shadow: inset 0 -3px 0 var(--bb-color-accent-primary, #2563eb);
    }

    .bb-study-reading__preview {
        position: absolute;
        inset: auto 0 0;
        z-index: 2;
        max-height: min(72dvh, 42rem);
        border-top: 1px solid var(--bb-color-border-subtle, #dbe2ea);
        border-left: 0;
        box-shadow: 0 -1rem 2.5rem rgb(15 23 42 / 18%);
    }
}

@media (max-width: 42rem) {
    .bb-study-reading__header {
        display: grid;
        gap: .75rem;
        padding: .8rem 1rem;
    }

    .bb-study-reading__header-actions {
        justify-content: flex-start;
    }

    .bb-study-reading__header-actions .btn {
        min-height: 2.65rem;
    }

    .bb-study-reading__content {
        padding: 1.5rem 1.05rem 5rem;
    }

    .bb-study-reading-copy {
        font-size: 1.08rem;
        line-height: 1.67;
    }

    .bb-study-reading__footer {
        justify-content: space-between;
    }

    .bb-study-reading__position {
        min-width: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .bb-study-reading__content {
        scroll-behavior: auto;
    }
}

.bb-study-reading [hidden] {
    display: none !important;
}