/* Floating case-study navigation and reading theme toggle. */

html {
    scroll-behavior: smooth;
}

.case-study-anchor-target {
    scroll-margin-top: calc(var(--layout-nav-height) + 1.25rem);
}

.case-study-floating-nav {
    position: fixed;
    top: calc(var(--layout-nav-height) + clamp(1rem, 2vh, 1.5rem));
    left: clamp(0.75rem, 1.6vw, 1.25rem);
    z-index: 120;
    width: min(15.5rem, calc(100vw - 2rem));
    color: var(--color-text);
    pointer-events: none;
}

.case-study-toc-trigger {
    display: none;
}

.case-study-floating-nav.is-collapsed .case-study-toc-panel {
    display: none;
}

.case-study-floating-nav.is-collapsed .case-study-toc-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding: 0 1rem;
    border: 1px solid color-mix(in srgb, var(--color-accent) 48%, var(--color-border));
    border-radius: 999px;
    background: var(--color-accent);
    color: var(--color-on-accent);
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
    cursor: pointer;
    pointer-events: auto;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.case-study-toc-panel {
    display: grid;
    gap: 0.85rem;
    padding: 0.95rem;
    border: 1px solid color-mix(in srgb, var(--color-border) 82%, transparent);
    border-radius: 18px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.025)),
        color-mix(in srgb, var(--color-bg) 82%, transparent);
    box-shadow: 0 20px 70px rgba(0, 0, 0, 0.26);
    backdrop-filter: blur(18px);
    pointer-events: auto;
}

.case-study-toc-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.1rem;
    padding-bottom: 0.7rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.92rem;
}

.case-study-toc-header strong {
    grid-column: 1;
}

.case-study-toc-hide {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
    min-height: 1.8rem;
    padding: 0 0.55rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-surface-muted) 70%, transparent);
    color: var(--color-text-light);
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition:
        background-color var(--transition-base),
        border-color var(--transition-base),
        color var(--transition-base);
}

.case-study-toc-hide:hover,
.case-study-toc-hide:focus-visible {
    border-color: var(--color-accent);
    color: var(--color-text);
    outline: none;
}

.case-study-toc-kicker,
.case-study-theme-label {
    color: var(--color-text-light);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.case-study-toc-links {
    display: grid;
    gap: 0.25rem;
    max-height: min(52vh, 30rem);
    overflow: auto;
    padding-right: 0.1rem;
}

.case-study-toc-link {
    display: grid;
    grid-template-columns: 1.35rem minmax(0, 1fr);
    gap: 0.5rem;
    align-items: center;
    padding: 0.52rem 0.58rem;
    border: 1px solid transparent;
    border-radius: 12px;
    color: var(--color-text-light);
    font-size: 0.78rem;
    font-weight: 600;
    line-height: 1.25;
    text-decoration: none;
    transition:
        background-color var(--transition-base),
        border-color var(--transition-base),
        color var(--transition-base),
        transform var(--transition-base);
}

.case-study-toc-link:hover,
.case-study-toc-link:focus-visible {
    background: color-mix(in srgb, var(--color-surface-muted) 72%, transparent);
    border-color: color-mix(in srgb, var(--color-accent) 34%, var(--color-border));
    color: var(--color-text);
    transform: translateX(2px);
    outline: none;
}

.case-study-toc-link.active {
    background: color-mix(in srgb, var(--color-accent) 18%, var(--color-surface-muted));
    border-color: color-mix(in srgb, var(--color-accent) 52%, var(--color-border));
    color: var(--color-text);
}

.case-study-toc-icon {
    display: inline-grid;
    place-items: center;
    width: 1.2rem;
    height: 1.2rem;
    border-radius: 50%;
    background: color-mix(in srgb, var(--color-text) 8%, transparent);
    color: var(--color-accent);
    font-size: 0.72rem;
}

.case-study-theme-control {
    display: grid;
    gap: 0.45rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
}

.case-study-theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    min-height: 2.45rem;
    padding: 0.4rem 0.48rem 0.4rem 0.78rem;
    border: 1px solid color-mix(in srgb, var(--color-accent) 42%, var(--color-border));
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-surface-muted) 78%, transparent);
    color: var(--color-text);
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition:
        background-color var(--transition-base),
        border-color var(--transition-base),
        color var(--transition-base),
        transform var(--transition-base);
}

.case-study-theme-toggle:hover,
.case-study-theme-toggle:focus-visible {
    border-color: var(--color-accent);
    background: color-mix(in srgb, var(--color-accent) 14%, var(--color-surface-muted));
    transform: translateY(-1px);
    outline: none;
}

.case-study-theme-toggle-icon {
    display: inline-grid;
    place-items: center;
    width: 1.55rem;
    height: 1.55rem;
    border-radius: 50%;
    background: var(--color-accent);
    color: var(--color-on-accent);
    line-height: 1;
}

html.light {
    color-scheme: light;
    --color-bg: #f6f1e8;
    --color-text: #171510;
    --color-text-light: #5f594e;
    --color-border: rgba(23, 21, 16, 0.16);
    --color-surface-muted: #fffaf0;
    --color-tab-inactive: #ebe2d2;
    --color-tab-active: #fffaf0;
    --color-link-action: #775d00;
    --color-link-action-hover: #4d3c00;
}

html.light body {
    background: var(--color-bg);
    color: var(--color-text);
}

html.light input,
html.light textarea,
html.light select,
html.light button {
    color-scheme: light;
}

html.light .nav-bar {
    background: color-mix(in srgb, var(--color-bg) 78%, transparent);
    border-color: var(--color-border);
}

html.light .nav-link {
    color: var(--color-text-light);
}

html.light .nav-link:hover,
html.light .nav-link.active {
    color: var(--color-text);
}

html.light :is(.case-study-panel, .case-study-callout, .case-study-tldr, .meta-item, .case-study-mini-card) {
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.86), rgba(255, 255, 255, 0.54)),
        var(--color-surface-muted);
    border-color: var(--color-border);
    box-shadow: 0 18px 56px rgba(81, 64, 28, 0.11);
}

html.light .case-study-cover-image,
html.light .case-study-media,
html.light .case-study-media--placeholder {
    background: var(--color-surface-muted);
    border-color: var(--color-border);
}

html.light :is(.case-study-text, .case-study-subtitle, .case-study-list, .case-study-disclaimer, .meta-detail, .case-study-tldr dd) {
    color: var(--color-text-light);
}

html.light .case-study-tag-chip {
    background: color-mix(in srgb, var(--color-accent) 16%, var(--color-surface-muted));
    border-color: color-mix(in srgb, var(--color-accent) 32%, var(--color-border));
    color: var(--color-on-accent);
}

html.light .footer {
    background: transparent;
    border-color: var(--color-border);
}

html.light .case-study-floating-nav {
    color: var(--color-text);
}

html.light .case-study-toc-panel {
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.66)),
        color-mix(in srgb, var(--color-bg) 72%, transparent);
    box-shadow: 0 20px 70px rgba(81, 64, 28, 0.18);
}

@media (min-width: 1280px) {
    .case-study-floating-nav {
        left: clamp(0.75rem, 1vw, 1rem);
        width: min(14rem, 17vw);
    }

    .case-study-container {
        max-width: var(--case-study-reading-width);
    }
}

@media (max-width: 1120px) {
    .case-study-floating-nav {
        width: min(13.75rem, calc(100vw - 2rem));
    }

    .case-study-toc-panel {
        padding: 0.75rem;
    }

    .case-study-toc-link {
        font-size: 0.72rem;
    }
}

@media (max-width: 900px) {
    .case-study-floating-nav {
        top: auto;
        right: 1rem;
        bottom: 1rem;
        left: auto;
        width: min(22rem, calc(100vw - 2rem));
    }

    .case-study-toc-trigger {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        min-height: 3rem;
        padding: 0 1rem;
        margin-left: auto;
        border: 1px solid color-mix(in srgb, var(--color-accent) 48%, var(--color-border));
        border-radius: 999px;
        background: var(--color-accent);
        color: var(--color-on-accent);
        box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
        cursor: pointer;
        pointer-events: auto;
        font-family: var(--font-sans);
        font-size: 0.78rem;
        font-weight: 800;
        letter-spacing: 0.1em;
        text-transform: uppercase;
    }

    .case-study-toc-panel {
        position: absolute;
        right: 0;
        bottom: calc(100% + 0.65rem);
        width: 100%;
        max-height: min(70vh, 34rem);
        overflow: auto;
        opacity: 0;
        pointer-events: none;
        transform: translateY(0.75rem) scale(0.98);
        transform-origin: bottom right;
        transition:
            opacity var(--transition-base),
            transform var(--transition-base);
    }

    .case-study-floating-nav.is-open .case-study-toc-panel {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0) scale(1);
    }

    .case-study-toc-links {
        max-height: 45vh;
    }
}

@media (max-width: 768px) {
    .case-study-floating-nav {
        bottom: calc(var(--layout-nav-height-mobile) + 1rem);
    }
}

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

    .case-study-toc-link,
    .case-study-theme-toggle,
    .case-study-toc-panel {
        transition: none;
    }
}