/* pandō single-screen landing page */

:root {
    --landing-frame-x: clamp(var(--space-3), 3.6vw, var(--space-8));
    --landing-main-y: clamp(var(--space-3), 4vw, var(--space-6));
    --landing-col-left: 7fr;
    --landing-col-right: 13fr;
    --landing-left-pad: clamp(var(--space-5), 6vw, var(--space-10));
    --landing-right-pad: clamp(var(--space-3), 3.6vw, var(--space-6));
    --landing-grid: rgba(10, 10, 10, 0.07);
    --landing-grid-strong: rgba(10, 10, 10, 0.11);
    --landing-surface: rgba(253, 252, 250, 0.46);
    --landing-surface-strong: rgba(253, 252, 250, 0.72);
    --landing-shadow: 0 8px 24px rgba(12, 12, 12, 0.06);
    --landing-code: #0f1110;
    --landing-code-border: rgba(255, 255, 255, 0.08);
    --color-name-before: #7ca8d9;
    --color-name-ambig: #af8950;
}

body {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: grid;
    grid-template-columns: var(--landing-col-left) var(--landing-col-right);
    grid-template-rows: auto minmax(0, 1fr) auto auto;
    grid-template-areas:
        "header header"
        "main main"
        "anchor-l anchor-r"
        "footnote footnote";
    position: relative;
    background: var(--color-paper);
    color: var(--color-text-secondary);
}

body > *:not(#mycelium-background) {
    position: relative;
    z-index: 3;
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
}

body::before {
    display: none;
}

body::after {
    z-index: 1;
    background:
        radial-gradient(circle at 14% 18%, rgba(var(--color-accent-rgb), 0.05), transparent 28%),
        radial-gradient(circle at 84% 76%, rgba(0, 0, 0, 0.03), transparent 26%);
}

#mycelium-background {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.76;
}

.landing-header,
.zone-anchor-l,
.zone-anchor-r,
.zone-footnote {
    background: transparent;
}

.landing-header {
    grid-area: header;
    padding: var(--space-1-5) var(--landing-frame-x);
}

#main-header.landing-header {
    z-index: 10;
}

.header-inner,
.footnote-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    width: 100%;
}

.logo {
    display: inline-flex;
    align-items: center;
}

.header-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
}

.landing-header .cta-install-command {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0.28rem 0.36rem 0.28rem 0.42rem;
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-base);
    background: rgba(var(--color-paper-rgb), 0.7);
    box-shadow: 0 1px 3px rgba(var(--color-shadow-base-rgb), 0.05);
}

.landing-header .install-command-text {
    font-family: var(--font-mono);
    font-size: var(--font-size-ui-nav);
    line-height: 1;
    letter-spacing: var(--tracking-wide);
    color: var(--color-ink);
    user-select: all;
    white-space: nowrap;
    padding: 0.46rem 0.72rem 0.46rem 0.18rem;
}

.landing-header .install-command-label {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-family: var(--font-mono);
    font-size: var(--font-size-2xs);
    line-height: 1;
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-accent);
    padding: 0.46rem 0.52rem;
    border: none;
    border-radius: calc(var(--radius-sm) + 1px);
    background: rgba(var(--color-accent-rgb), 0.1);
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-pando), color var(--duration-fast) var(--ease-pando);
}

.landing-header .install-command-label:hover {
    background: rgba(var(--color-accent-rgb), 0.18);
}

.install-chevron {
    transition: transform var(--duration-fast) var(--ease-pando);
}

.install-command-label[aria-expanded="true"] .install-chevron {
    transform: rotate(180deg);
}

.landing-header .install-copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.9rem;
    height: 1.9rem;
    border: 1px solid rgba(var(--color-accent-rgb), 0.14);
    border-radius: var(--radius-sm);
    background: rgba(var(--color-accent-rgb), 0.04);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-pando), border-color var(--duration-fast) var(--ease-pando), background-color var(--duration-fast) var(--ease-pando), transform var(--duration-fast) var(--ease-pando);
}

.landing-header .install-copy-btn:hover,
.landing-header .install-copy-btn:focus-visible {
    color: var(--color-accent);
    border-color: rgba(var(--color-accent-rgb), 0.3);
    background: rgba(var(--color-accent-rgb), 0.08);
    transform: translateY(-1px);
}

.landing-header .install-copy-btn:active {
    background: rgba(var(--color-accent-rgb), 0.1);
    transform: translateY(1px);
}

.landing-header .cta-install-command {
    position: relative;
}

.install-dropdown {
    position: absolute;
    top: calc(100% + 0.35rem);
    left: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    min-width: max-content;
    padding: var(--space-1);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-base);
    background: var(--color-paper);
    box-shadow: 0 6px 20px rgba(var(--color-shadow-base-rgb), 0.1),
                0 1px 3px rgba(var(--color-shadow-base-rgb), 0.06);
    animation: install-dropdown-in 140ms var(--ease-pando);
}

@keyframes install-dropdown-in {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.install-dropdown[hidden] {
    display: none;
}

.install-dropdown-section {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.install-dropdown-heading {
    font-family: var(--font-mono);
    font-size: var(--font-size-2xs);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    padding: 0.25rem 0.5rem 0.35rem;
    opacity: 0.7;
}

.install-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.4rem 0.5rem;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    text-align: left;
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-pando);
}

.install-dropdown-item:hover {
    background: rgba(var(--color-accent-rgb), 0.08);
}

.install-dropdown-label {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-ink);
    white-space: nowrap;
    min-width: 5rem;
}

.install-dropdown-item code {
    font-family: var(--font-mono);
    font-size: var(--font-size-2xs);
    color: var(--color-text-tertiary);
    white-space: nowrap;
}

.install-dropdown-item.is-copied .install-dropdown-label,
.install-dropdown-item.is-copied code {
    color: var(--color-accent);
}

:root[data-theme="dark"] .install-dropdown {
    background: rgba(18, 24, 21, 0.95);
    border-color: rgba(126, 198, 153, 0.18);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35),
                0 1px 3px rgba(0, 0, 0, 0.2);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.landing-main {
    grid-area: main;
    position: relative;
    display: grid;
    grid-template-columns: var(--landing-col-left) var(--landing-col-right);
    min-height: 0;
}

.zone-content,
.zone-detail,
.panel-layer {
    min-height: 0;
}

.zone-content {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: clamp(var(--space-6), 10vh, 10rem) clamp(var(--space-4), 3vw, var(--space-7)) var(--space-6) var(--landing-left-pad);
}

.zone-detail {
    display: block;
    min-width: 0;
    padding-left: clamp(var(--space-3), 2vw, var(--space-5));
    padding-right: var(--landing-frame-x);
}

.landing-content-stack {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
}

.question-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: min(32rem, 100%);
    transition: opacity var(--duration-normal) var(--ease-pando), transform var(--duration-normal) var(--ease-pando);
}

.question-list::before {
    display: none;
}

.question-list.is-exiting {
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
}

.question-list.is-hidden {
    visibility: hidden;
}

.question-btn {
    display: block;
    width: 100%;
    padding: 0.65em 0;
    border: 0;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    text-align: left;
    font-family: var(--font-display);
    font-size: clamp(1rem, min(2.2vw, 2.4vh), 1.5rem);
    font-weight: var(--font-weight-light);
    line-height: var(--line-height-snug);
    letter-spacing: var(--tracking-tight);
    transition: color var(--duration-normal) var(--ease-pando), transform var(--duration-normal) var(--ease-pando), opacity var(--duration-normal) var(--ease-pando);
}

.question-btn::after {
    content: "\2009\203A";
    display: inline-block;
    margin-left: 0.2em;
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity var(--duration-normal) var(--ease-pando), transform var(--duration-normal) var(--ease-pando);
    font-size: 1em;
    font-weight: var(--font-weight-light);
}

.question-btn:hover::after,
.question-btn:focus-visible::after,
.question-btn[aria-expanded="true"]::after {
    opacity: 0.6;
    transform: translateX(0);
}

.question-btn:hover,
.question-btn:focus-visible,
.question-btn[aria-expanded="true"] {
    color: var(--color-accent);
    transform: translateX(4px);
}

.question-list:hover .question-btn:not(:hover):not(:focus-visible):not([aria-expanded="true"]) {
    opacity: 0.8;
}

.landing-cta-block {
    display: flex;
    flex-direction: column;
    gap: var(--space-1-5);
    align-items: flex-start;
}

.landing-cta-meta {
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
    font-size: var(--font-size-2xs);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
}

.landing-cta-link {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    text-decoration-color: rgba(var(--color-border-base-rgb, 10, 10, 10), 0.2);
    transition: color var(--duration-fast) var(--ease-pando), text-decoration-color var(--duration-fast) var(--ease-pando);
}

.landing-cta-link:hover,
.landing-cta-link:focus-visible {
    color: var(--color-accent);
    text-decoration-color: var(--color-accent);
}

.landing-primary-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    padding: 0.78rem 1.08rem 0.78rem 0.92rem;
    border-radius: var(--radius-base);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    position: relative;
    transition: color var(--duration-fast) var(--ease-pando), border-color var(--duration-fast) var(--ease-pando), background-color var(--duration-fast) var(--ease-pando), box-shadow var(--duration-fast) var(--ease-pando), transform var(--duration-fast) var(--ease-pando);
}

.landing-demo-cta {
    gap: var(--space-1);
}

@media (min-width: 769px) {
    .landing-demo-cta {
        display: none;
    }
}

.landing-primary-cta {
    border: 1px solid var(--color-accent-border);
    background: rgba(var(--color-accent-rgb), 0.09);
    color: var(--color-ink);
    box-shadow: 0 1px 3px rgba(var(--color-accent-rgb), 0.06), 0 4px 12px rgba(var(--color-accent-rgb), 0.05);
}

.landing-primary-cta:hover,
.landing-primary-cta:focus-visible {
    border-color: var(--color-accent);
    background: rgba(var(--color-accent-rgb), 0.13);
    box-shadow: 0 2px 6px rgba(var(--color-accent-rgb), 0.1), 0 8px 16px rgba(var(--color-accent-rgb), 0.08);
    transform: translateY(-1px);
}

.landing-primary-cta:active {
    background: linear-gradient(180deg, rgba(var(--color-accent-rgb), 0.11), rgba(var(--color-accent-rgb), 0.07));
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.08);
    transform: translateY(1px);
}

.question-btn:focus-visible,
.demo-preview:focus-visible,
.demo-play-btn:focus-visible,
.demo-close-btn:focus-visible,
.terminal-replay-btn:focus-visible {
    outline: 2px solid rgba(var(--color-accent-rgb), 0.6);
    outline-offset: 3px;
}

.demo-play-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1-5);
    padding: 0.85rem 1.2rem 0.85rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-secondary);
    box-shadow: none;
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: var(--tracking-wide);
    cursor: pointer;
    transition: color var(--duration-normal) var(--ease-pando), border-color var(--duration-normal) var(--ease-pando), background-color var(--duration-normal) var(--ease-pando), transform var(--duration-normal) var(--ease-pando), box-shadow var(--duration-normal) var(--ease-pando);
}

.demo-play-btn:hover,
.demo-play-btn:focus-visible {
    color: var(--color-accent);
    border-color: var(--color-accent-border);
    background: transparent;
    box-shadow: var(--shadow-glow-accent);
    transform: translateY(-1px);
}

.demo-play-btn:active {
    color: var(--color-accent);
    border-color: var(--color-accent-border);
    background: rgba(var(--color-accent-rgb), 0.06);
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.08);
    transform: translateY(1px);
}

.demo-play-icon {
    font-size: var(--font-size-2xs);
    line-height: 1;
    opacity: 0.78;
}

.panel-layer {
    position: relative;
    overflow: hidden;
    pointer-events: auto;
    min-height: 100%;
    min-width: 0;
}

.content-panel {
    position: absolute;
    inset: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: clamp(var(--space-6), 10vh, 10rem) 0 clamp(var(--space-6), 6vw, var(--space-9)) 0;
    opacity: 0;
    transform: translateY(6px);
    pointer-events: none;
    scrollbar-width: thin;
    background: transparent;
    border: 0;
}

.content-panel-shell {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-4);
    width: 100%;
    min-height: 100%;
    padding: clamp(var(--space-4), 3.8vw, var(--space-5));
    border-radius: clamp(var(--radius-lg), 2vw, 1.5rem);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.08));
    box-shadow: 0 4px 14px rgba(12, 12, 12, 0.016);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.content-panel-shell::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(10, 10, 10, 0.022) 1px, transparent 1px) 0 0 / 100% var(--panel-line-height, 3.5rem);
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.22), transparent 72%);
    pointer-events: none;
}

.answer-default {
    position: absolute;
    inset: 0;
    z-index: 0;
    display: flex;
    align-items: center;
    padding: 0;
    transition: opacity 220ms var(--ease-pando), transform 220ms var(--ease-pando);
}

.demo-preview {
    position: relative;
    z-index: 1;
    display: block;
    width: 100%;
    height: 100%;
    padding: 0;
    border: 0;
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.demo-preview-shell {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: 100%;
    border: 1px solid rgba(var(--color-accent-rgb), 0.1);
    border-radius: clamp(var(--radius-lg), 2vw, 1.5rem);
    overflow: hidden;
    background: transparent;
    box-shadow: 0 10px 26px rgba(12, 12, 12, 0.025);
    -webkit-backdrop-filter: blur(4px) saturate(102%);
    backdrop-filter: blur(4px) saturate(102%);
}

.demo-preview-chrome {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1-5) var(--space-2);
    border-bottom: 1px solid rgba(var(--color-accent-rgb), 0.05);
    background: rgba(var(--color-paper-rgb), 0.035);
}

.demo-preview-body {
    display: flex;
    flex: 1;
    align-items: center;
    justify-content: center;
    padding: clamp(var(--space-4), 4vw, var(--space-6));
    background: transparent;
}

.demo-preview-playpill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    width: auto;
    height: auto;
    min-height: 2.25rem;
    padding: 0.58rem 0.88rem 0.58rem 0.76rem;
    border-radius: calc(var(--radius-sm) + 1px);
    border: 1px solid color-mix(in srgb, var(--color-border-subtle) 76%, var(--color-accent) 24%);
    background: rgba(var(--color-paper-rgb), 0.22);
    color: var(--color-ink);
    font-family: var(--font-mono);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-2xs);
    letter-spacing: calc(var(--tracking-label) * 0.92);
    text-transform: uppercase;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 1px 10px rgba(12, 12, 12, 0.04);
    pointer-events: none;
    transition: transform var(--duration-fast) var(--ease-pando), border-color var(--duration-fast) var(--ease-pando), background-color var(--duration-fast) var(--ease-pando), box-shadow var(--duration-fast) var(--ease-pando), color var(--duration-fast) var(--ease-pando);
}

.demo-preview-playpill .demo-play-icon {
    transform: translateX(1px);
}

.demo-preview:hover .demo-preview-shell,
.demo-preview:focus-visible .demo-preview-shell {
    border-color: rgba(var(--color-accent-rgb), 0.18);
    box-shadow: 0 12px 30px rgba(var(--color-accent-rgb), 0.045);
}

.demo-preview:hover .demo-preview-playpill,
.demo-preview:focus-visible .demo-preview-playpill {
    border-color: color-mix(in srgb, var(--color-accent-border) 70%, var(--color-accent) 30%);
    background: rgba(var(--color-paper-rgb), 0.3);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 14px rgba(var(--color-accent-rgb), 0.06);
    transform: translateY(-1px);
}

.demo-preview:active .demo-preview-playpill {
    transform: translateY(1px);
    background: rgba(var(--color-paper-rgb), 0.26);
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.08), 0 1px 6px rgba(12, 12, 12, 0.03);
    filter: brightness(0.94);
}

.demo-preview .demo-preview-shell {
    transition: border-color var(--duration-normal) var(--ease-pando), box-shadow var(--duration-normal) var(--ease-pando), background-color var(--duration-normal) var(--ease-pando);
}

.answer-default.is-hidden {
    opacity: 0;
    transform: translateY(6px);
    pointer-events: none;
}

.answer-default::before,
.answer-default::after {
    display: none;
}

.answer-default::before {
    inset: clamp(var(--space-4), 4vw, var(--space-6)) clamp(var(--space-4), 4vw, var(--space-6)) auto;
    height: clamp(16rem, 44vh, 28rem);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0));
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.18), transparent 78%);
}

.answer-default::after {
    top: clamp(var(--space-8), 14vh, 10rem);
    right: clamp(var(--space-5), 5vw, var(--space-8));
    width: min(34vw, 24rem);
    height: min(34vw, 24rem);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--color-accent-rgb), 0.06), transparent 72%);
    filter: blur(24px);
    opacity: 0.8;
}

.content-panel[hidden] {
    display: none;
}

.content-panel.is-active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    transition: opacity 280ms var(--ease-pando), transform 280ms var(--ease-pando);
}

.content-panel.is-closing {
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 200ms var(--ease-pando), transform 200ms var(--ease-pando);
}

.panel-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    width: min(100%, 46rem);
}

.panel-body p.panel-punchline {
    margin: 0;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border-subtle);
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-xl), 2vw, var(--font-size-2xl));
    font-weight: var(--font-weight-light);
    font-style: italic;
    line-height: var(--line-height-tight);
    letter-spacing: var(--tracking-tight);
    color: var(--color-ink-soft);
    max-width: none;
}

.panel-body-readable {
    width: min(100%, 54rem);
}

.panel-body-medium {
    width: min(100%, 60rem);
}

.panel-body-wide {
    width: 100%;
}

.kw {
    color: var(--color-accent);
}

.kw-warn {
    color: var(--color-name-ambig);
}

.panel-body-split {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1.1fr);
    gap: clamp(var(--space-3), 2vw, var(--space-5));
    width: 100%;
    align-items: start;
}

.panel-body-split-compact {
    grid-template-columns: minmax(0, 0.85fr) minmax(18rem, 1.15fr);
}

.panel-copy,
.panel-proof {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.panel-proof {
    min-width: 0;
}

.panel-proof-stack {
    gap: var(--space-2);
}

.panel-body-prose {
    gap: var(--space-4);
}

.panel-body-answer-q1 {
}

.panel-graph-strip {
    flex-direction: column;
}

.panel-graph-strip p {
    font-size: var(--font-size-md);
    color: var(--color-text);
}

.panel-graph-strip p:first-child {
    white-space: nowrap;
}

.panel-body-answer-q1 .panel-lead {
    max-width: 28ch;
    font-size: clamp(1.6rem, 2.8vw, 2.2rem);
    line-height: 1.08;
    margin-bottom: var(--space-2);
}

.panel-declaration {
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-xl), 2vw, var(--font-size-2xl));
    font-weight: var(--font-weight-normal);
    line-height: 1.18;
    letter-spacing: var(--tracking-tight);
    color: var(--color-text-secondary);
    max-width: none;
}

.panel-delivery-strip {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-4);
}

.panel-delivery-strip p {
    font-family: var(--font-sans);
    font-size: var(--font-size-body);
    line-height: var(--line-height-normal);
    color: var(--color-text-secondary);
    max-width: none;
}

.panel-nav {
    position: absolute;
    bottom: clamp(var(--space-3), 2.5vw, var(--space-4));
    left: clamp(var(--space-4), 3.8vw, var(--space-5));
    right: clamp(var(--space-4), 3.8vw, var(--space-5));
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-nav-spacer {
    width: 3rem;
}

.panel-nav-btn {
    padding: var(--space-0-5) var(--space-1);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    opacity: 0.5;
    background: none;
    border: none;
    cursor: pointer;
    transition: opacity 180ms ease;
}

.panel-nav-btn:hover {
    opacity: 1;
    color: var(--color-accent);
}

.panel-closer {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-accent);
    max-width: none;
}

.panel-body-answer-q2 {
    padding-top: var(--space-3);
}

.panel-body-answer-q2 .panel-copy-stack {
    gap: var(--space-1-5);
}

.panel-body-answer-q2 .panel-copy-stack p:first-child {
    max-width: none;
}

.panel-body-answer-q2 .panel-copy-stack p:nth-child(3),
.panel-body-answer-q2 .panel-copy-stack p:nth-child(4) {
    max-width: 32rem;
}

.panel-body-answer-q3,
.panel-body-answer-q4,
.panel-body-answer-q5 {
    position: relative;
    z-index: 1;
}

.panel-prose-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3) clamp(var(--space-4), 3vw, var(--space-6));
    align-items: start;
}

.panel-prose-grid > p:last-child:nth-child(odd) {
    grid-column: 1 / -1;
}

.panel-body p,
.premise-text,
.how-card-desc,
.model-cap-desc,
.lang-strip span {
    margin: 0;
}

.panel-body p {
    font-family: var(--font-sans);
    font-size: var(--font-size-md);
    line-height: var(--line-height-normal);
    color: var(--color-text-secondary);
    max-width: 42rem;
    font-optical-sizing: auto;
    font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
    font-variation-settings: "wght" 420;
    letter-spacing: var(--tracking-body);
    text-rendering: optimizeLegibility;
}

.panel-body p strong {
    color: var(--color-ink);
}

.panel-lead {
    color: var(--color-text-secondary);
    font-size: clamp(var(--font-size-lg), 1.4vw, var(--font-size-xl));
    font-weight: var(--font-weight-normal);
    line-height: 1.18;
    letter-spacing: var(--tracking-tight);
    max-width: 44rem;
}

.panel-body-split .panel-copy p,
.panel-body-split .panel-copy .panel-lead {
    max-width: none;
}

.panel-copy-stack {
    display: grid;
    gap: var(--space-2);
}

.panel-body-pivot {
    justify-content: flex-start;
    align-items: flex-start;
    gap: var(--space-4);
}

.panel-body-argument {
    width: min(100%, 56rem);
}

.pivot-callout {
    display: grid;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    border-left: 2px solid rgba(var(--color-accent-rgb), 0.3);
    background: linear-gradient(90deg, rgba(var(--color-accent-rgb), 0.06), transparent 72%);
}

.pivot-strike {
    color: var(--color-text-tertiary);
    text-decoration: line-through;
    text-decoration-thickness: 2px;
}

.pivot-workarounds {
    color: var(--color-text-tertiary);
}

.pivot-nowrap {
    display: inline-block;
    max-width: 100%;
    white-space: nowrap;
    font-size: clamp(0.78rem, 0.72rem + 0.45vw, var(--font-size-md));
    letter-spacing: -0.01em;
}

/* Landing uses italic-accent WITHOUT font-display to keep inherited sans metrics
   in the single-screen layout. The styles.css version adds font-family: var(--font-display)
   which changes text height and breaks the vh-based layout. */
.italic-accent {
    color: var(--color-accent);
    font-style: italic;
}

.premise-card {
    max-width: none;
    display: grid;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    border-left: 2px solid rgba(var(--color-accent-rgb), 0.3);
    background: linear-gradient(90deg, rgba(var(--color-accent-rgb), 0.06), transparent 72%);
}

.premise-card .premise-text {
    color: var(--color-text-secondary);
    max-width: none;
    font-family: var(--font-sans);
    font-size: clamp(var(--font-size-body), 1.15vw, 1.0625rem);
    line-height: var(--line-height-relaxed);
}

.premise-card code,
.how-card-desc code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.08em 0.26em;
    border-radius: var(--radius-sm);
    background: rgba(var(--color-accent-rgb), 0.08);
}

.name-flow {
    display: flex;
    align-items: center;
    gap: var(--space-1-5);
    flex-wrap: wrap;
    margin-top: 0;
}

.panel-verdict {
    margin: 0;
    font-family: var(--font-sans);
    font-size: clamp(var(--font-size-md), 1.25vw, var(--font-size-lg));
    font-weight: var(--font-weight-medium);
    line-height: 1.35;
    letter-spacing: var(--tracking-tight);
    color: var(--color-ink);
    max-width: none;
}

.panel-verdict-accent {
    color: var(--color-accent);
    font-style: italic;
}

.panel-subkicker {
    margin: calc(var(--space-0-5) * -1) 0 0;
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-style: italic;
    color: var(--color-text-secondary);
    letter-spacing: var(--tracking-tight);
    max-width: none;
}

.name-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.34rem 0.75rem;
    border: 1px solid var(--landing-grid-strong);
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: var(--tracking-wide);
}

.name-chip-old {
    color: var(--color-error);
    background: rgba(var(--color-error-rgb), 0.06);
}

.name-chip-new {
    color: var(--color-accent);
    background: rgba(var(--color-accent-rgb), 0.08);
}

.name-arrow {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-lg);
}

.how-cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(var(--space-2-5), 1.6vw, var(--space-4));
    margin-top: 0;
    align-items: stretch;
}

.panel-body-answer-q3 .how-cards {
    margin-top: 0;
    align-items: stretch;
}

.how-card,
.model-cap {
    border: 1px solid rgba(10, 10, 10, 0.08);
    background: rgba(var(--color-paper-rgb), 0.34);
    box-shadow: none;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.how-card {
    position: relative;
    display: grid;
    grid-template-rows: minmax(5.75rem, auto) 1fr;
    gap: var(--space-2);
    padding: var(--space-3);
    min-height: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: linear-gradient(180deg, rgba(var(--color-accent-rgb), 0.04), rgba(var(--color-accent-rgb), 0.012) 38%, rgba(var(--color-paper-rgb), 0.22) 100%);
    box-shadow: 0 10px 24px rgba(12, 12, 12, 0.025);
}

.how-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, rgba(var(--color-accent-rgb), 0.34), rgba(var(--color-accent-rgb), 0));
}

.how-card-baseline {
    background: rgba(var(--color-paper-rgb), 0.28);
}

.how-card-baseline::before {
    background: linear-gradient(90deg, rgba(10, 10, 10, 0.08), transparent);
}

.how-card-baseline .how-card-type {
    color: var(--color-text-tertiary);
}

.how-card-problem {
    background: linear-gradient(180deg, rgba(var(--color-syntax-warning-rgb), 0.1), rgba(var(--color-syntax-warning-rgb), 0.04) 34%, rgba(var(--color-paper-rgb), 0.22) 100%);
}

.how-card-problem::before {
    background: linear-gradient(90deg, rgba(var(--color-syntax-warning-rgb), 0.36), rgba(var(--color-syntax-warning-rgb), 0));
}

.how-card-problem .how-card-type {
    color: var(--color-name-ambig);
}

.how-card-resolved {
    background: linear-gradient(180deg, rgba(var(--color-accent-rgb), 0.11), rgba(var(--color-accent-rgb), 0.035) 34%, rgba(var(--color-paper-rgb), 0.22) 100%);
}

.how-card-resolved::before {
    height: 2px;
    background: linear-gradient(90deg, rgba(var(--color-accent-rgb), 0.62), rgba(var(--color-accent-rgb), 0));
}

.how-card-resolved .how-card-type {
    color: var(--color-syntax-success, var(--color-accent));
}

.how-card-header {
    padding: 0;
    display: grid;
    align-content: start;
    gap: var(--space-0-5);
}

.how-card-meta {
    margin-bottom: var(--space-1);
}

.how-card-type,
.model-cap-title {
    margin: 0;
    font-family: var(--font-mono);
    font-size: var(--font-size-badge);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-accent);
}

.how-card-desc {
    font-family: var(--font-sans);
    font-size: var(--font-size-body);
    line-height: var(--line-height-normal);
    color: var(--color-text-secondary);
    max-width: none;
}

.how-book-page,
.schematic-terminal {
    background: var(--landing-code);
    border-top: 1px solid var(--landing-code-border);
    font-family: var(--font-mono);
    font-size: var(--font-size-ui-nav);
    line-height: var(--line-height-relaxed);
    color: rgba(var(--color-paper-static-rgb), 0.78);
    overflow-x: auto;
}

.how-book-page {
    align-self: end;
    min-height: 7rem;
    margin-top: var(--space-1);
    padding: var(--space-2) var(--space-2-5);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03), 0 8px 18px rgba(0, 0, 0, 0.12);
}

.how-book-line,
.schematic-line {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.is-highlight {
    color: rgba(var(--color-paper-static-rgb), 0.94);
}

.how-book-line.is-highlight {
    padding: 0.3rem 0.5rem 0.3rem 0.75rem;
    border-left: 2px solid rgba(var(--color-accent-rgb), 0.8);
    border-radius: var(--radius-sm);
    background: rgba(var(--color-accent-rgb), 0.12);
}

.how-book-line.is-ambiguous {
    padding: 0.3rem 0.5rem 0.3rem 0.75rem;
    border-left: 2px solid rgba(var(--color-syntax-warning-rgb), 0.8);
    border-radius: var(--radius-sm);
    background: rgba(var(--color-syntax-warning-rgb), 0.12);
}

.how-book-arrow {
    padding: 0.3rem 0;
    color: rgba(var(--color-paper-static-rgb), 0.46);
    font-size: var(--font-size-badge);
}

.name-before {
    color: var(--color-name-before);
}

.name-after {
    color: var(--color-syntax-green);
    font-weight: var(--font-weight-bold);
}

.is-ambiguous {
    color: var(--color-name-ambig);
}

.sch-kw {
    color: var(--color-syntax-keyword);
}

.sch-str {
    color: rgba(var(--color-paper-static-rgb), 0.92);
}

.sch-op,
.sch-dim {
    color: rgba(var(--color-paper-static-rgb), 0.48);
}

.sch-ok {
    color: var(--color-syntax-success);
}

.sch-err {
    color: var(--color-syntax-error);
}

.sch-caret {
    animation: caret-blink 1s step-end infinite;
}

.schematic-terminal {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.06);
    margin: var(--space-2) 0;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03), 0 12px 28px rgba(0, 0, 0, 0.12);
}

.schematic-terminal::before {
    content: "";
    position: absolute;
    top: 0.85rem;
    right: 1rem;
    width: 2.2rem;
    height: 0.45rem;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.03));
    opacity: 0.5;
}

@keyframes caret-blink {
    50% { opacity: 0; }
}

.token-headline,
.toolkit-heading {
    margin: 0;
    color: var(--color-ink);
}

.token-headline {
    font-family: var(--font-mono);
    font-size: clamp(var(--font-size-3xl), min(3.8vw, 3.6vh), 3rem);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    letter-spacing: var(--tracking-condensed);
    margin-bottom: 0;
}

.panel-body-metrics .panel-copy {
    gap: var(--space-2);
}

.panel-body-answer-q5 .lang-strip {
    max-width: 38rem;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(var(--space-2-5), 1.6vw, var(--space-4));
    align-items: stretch;
    margin-top: 0;
}

.why-cap {
    position: relative;
    display: grid;
    grid-template-rows: auto 1fr;
    gap: var(--space-2);
    padding: var(--space-3);
    min-height: 100%;
    border: 1px solid rgba(10, 10, 10, 0.08);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: linear-gradient(180deg, rgba(var(--color-accent-rgb), 0.04), rgba(var(--color-accent-rgb), 0.012) 38%, rgba(var(--color-paper-rgb), 0.22) 100%);
    box-shadow: 0 10px 24px rgba(12, 12, 12, 0.025);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.why-cap::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, rgba(var(--color-accent-rgb), 0.34), rgba(var(--color-accent-rgb), 0));
}

.why-cap-copy {
    display: grid;
    gap: var(--space-1);
}

.why-cap-title {
    margin: 0;
    font-family: var(--font-mono);
    font-size: var(--font-size-badge);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-accent);
}

.why-cap-title code {
    font-family: inherit;
    font-size: inherit;
    padding: 0;
    background: none;
    color: inherit;
}

.why-cap-copy > p:not(.why-cap-title) {
    margin: 0;
    font-family: var(--font-sans);
    font-size: var(--font-size-body);
    line-height: var(--line-height-normal);
    color: var(--color-text-secondary);
    max-width: none;
}

.why-cap .schematic-terminal {
    align-self: end;
    width: 100%;
    margin: var(--space-1) 0 0;
}

.panel-stat-list {
    display: grid;
    gap: var(--space-1);
    padding: var(--space-2) 0;
    border-top: 1px solid var(--color-border-subtle);
    border-bottom: 1px solid var(--color-border-subtle);
}

.toolkit-heading {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, min(3.2vw, 3vh), 2.6rem);
    font-weight: var(--font-weight-light);
    line-height: var(--line-height-display);
    letter-spacing: var(--tracking-condensed);
    margin-bottom: var(--space-3);
}

.toolkit-kicker {
    display: block;
    font-family: var(--font-mono);
    font-size: var(--font-size-badge);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0;
}

.panel-body-toolkit {
    gap: var(--space-3);
}

.panel-body-answer-q5 .model-capabilities-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

:root:not([data-theme="dark"]) .content-panel-shell {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.24), rgba(255, 255, 255, 0.09));
}

:root:not([data-theme="dark"]) .answer-default::before {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.26), rgba(255, 255, 255, 0));
}

:root:not([data-theme="dark"]) .answer-default::after {
    background: radial-gradient(circle, rgba(var(--color-accent-rgb), 0.07), transparent 72%);
    opacity: 0.9;
}

.model-capabilities-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    align-items: stretch;
    background: var(--color-border-subtle);
    border: 1px solid var(--landing-grid-strong);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.model-cap {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: var(--space-1);
    padding: var(--space-3);
    border: 0;
    border-radius: 0;
    box-shadow: none;
    min-height: auto;
    background: color-mix(in srgb, var(--color-paper) 72%, transparent);
}

.model-cap + .model-cap {
    margin-top: 0;
}

.model-cap-desc {
    margin-top: var(--space-0-5);
    font-family: var(--font-sans);
    font-size: var(--font-size-body);
    line-height: var(--line-height-normal);
    color: var(--color-text-secondary);
    max-width: none;
}

.lang-strip {
    display: flex;
    align-items: baseline;
    gap: var(--space-2) var(--space-3);
    flex-wrap: wrap;
    margin-top: 0;
    padding: 0;
    border: 0;
    background: transparent;
    text-align: left;
}

.lang-strip-label {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    font-weight: var(--font-weight-semibold);
}

.lang-strip-list {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
    letter-spacing: var(--tracking-narrow);
    white-space: nowrap;
}

.lang-strip-also {
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    font-style: italic;
    color: var(--color-text-secondary);
}

.zone-anchor-l,
.zone-anchor-r {
    min-height: 0;
    transition: opacity 400ms ease-out;
}

body.panel-active .zone-anchor-l,
body.panel-active .zone-anchor-r {
    opacity: 0;
    pointer-events: none;
}

.zone-anchor-l {
    grid-area: anchor-l;
    display: flex;
    align-items: flex-end;
    padding: var(--space-4) var(--space-4) var(--space-4) var(--landing-left-pad);
}

.zone-anchor-r {
    grid-area: anchor-r;
    display: flex;
    align-items: flex-end;
    padding: var(--space-4) var(--landing-frame-x) var(--space-4) var(--space-5);
}

.anchor-display {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(2rem, min(6.5vw, 5vh), 5.5rem);
    font-weight: var(--font-weight-light);
    line-height: 0.92;
    letter-spacing: var(--tracking-tightest);
    color: var(--color-ink);
}

.anchor-display .underscore {
    color: var(--color-accent);
    display: inline-block;
    animation: blink 1.5s infinite;
}

.anchor-body {
    max-width: none;
    display: grid;
    align-content: end;
    gap: var(--space-1);
    padding-bottom: 0.2rem;
}

.anchor-body p {
    margin: 0;
    font-family: var(--font-sans);
}

.anchor-line-1 {
    color: var(--color-ink-soft);
    font-family: var(--font-sans);
    font-size: clamp(var(--font-size-lg), min(1.8vw, 2.2vh), var(--font-size-2xl));
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-snug);
}

.anchor-accent {
    color: var(--color-accent);
}

.anchor-line-2 {
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
    font-size: clamp(var(--font-size-lg), min(1.8vw, 2.2vh), var(--font-size-2xl));
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
}


#main-footer.zone-footnote {
    grid-area: footnote;
    font-family: inherit;
    font-size: inherit;
    letter-spacing: normal;
    padding: var(--space-1-5) var(--landing-frame-x);
}

.footnote-brand,
.footnote-links a {
    font-family: var(--font-mono);
    font-size: var(--font-size-2xs);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.footnote-brand-name {
    text-transform: none;
}

.footnote-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: var(--space-2);
}

.footnote-links a {
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    text-decoration-color: rgba(var(--color-border-base-rgb, 10, 10, 10), 0.2);
    transition: color var(--duration-fast) var(--ease-pando), opacity var(--duration-fast) var(--ease-pando), text-decoration-color var(--duration-fast) var(--ease-pando);
}

.footnote-links a:hover,
.footnote-links a:focus-visible {
    color: var(--color-accent);
    text-decoration-color: var(--color-accent);
    opacity: 1;
}

@media (max-width: 1100px) {
    .panel-body-answer-q5 .lang-strip {
        max-width: none;
    }

    .lang-strip-list {
        white-space: normal;
    }
}

.demo-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: stretch;
    background: transparent;
    opacity: 1;
    pointer-events: auto;
    transition: none;
}

.demo-overlay[hidden] {
    display: none;
}

.demo-overlay.is-active {
    opacity: 1;
    pointer-events: auto;
}

.demo-overlay-inner {
    width: 100%;
    height: 100%;
    min-height: 28rem;
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

.demo-overlay-chrome {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1-5) var(--space-2);
    background: #171917;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.18);
}

.demo-overlay-chrome .terminal-dot:nth-child(1) {
    background: rgba(255, 95, 87, 0.8);
}

.demo-overlay-chrome .terminal-dot:nth-child(2) {
    background: rgba(255, 189, 46, 0.8);
}

.demo-overlay-chrome .terminal-dot:nth-child(3) {
    background: rgba(39, 201, 63, 0.8);
}

.terminal-title-group {
    flex: 1;
    text-align: center;
}

.terminal-title {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.55);
}

.terminal-replay-btn,
.demo-close-btn {
    border: 0;
    background: transparent;
    color: rgba(255, 255, 255, 0.55);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: color var(--duration-fast) var(--ease-pando), background-color var(--duration-fast) var(--ease-pando);
}

.terminal-replay-btn {
    padding: var(--space-0-5);
    font-size: 1.1rem;
}

.demo-close-btn {
    padding: var(--space-0-5) var(--space-1);
    font-size: var(--font-size-2xl);
    line-height: 1;
}

.terminal-replay-btn:hover,
.terminal-replay-btn:focus-visible,
.demo-close-btn:hover,
.demo-close-btn:focus-visible {
    color: rgba(255, 255, 255, 0.92);
    background: rgba(255, 255, 255, 0.06);
}

.terminal-replay-btn:active,
.demo-close-btn:active {
    color: rgba(255, 255, 255, 0.96);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(1px);
}

.demo-overlay .race-container {
    flex: 1;
    min-height: 0;
    overflow: auto;
    background: var(--color-dark-surface);
}

/* Check-icon hidden by default (CSP-safe, no inline style needed) */
.check-icon {
    display: none;
}

.install-copy-btn.is-copied .copy-icon {
    display: none;
}

.install-copy-btn.is-copied .check-icon {
    display: block;
}

.install-command-text.is-copied {
    color: var(--color-accent);
    transition: color 180ms ease;
}

/* Progressive text-wrap for body paragraphs */
.panel-body p {
    text-wrap: pretty;
}

.noscript-banner {
    position: fixed;
    right: var(--space-2);
    bottom: var(--space-2);
    left: var(--space-2);
    margin: 0;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    background: var(--color-accent);
    color: var(--color-paper-static);
    text-align: center;
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    z-index: 120;
}

/* Dark mode — shared landing dark theme rules.
   CSS requires separate blocks for @media system-preference vs explicit [data-theme].
   Variable overrides must be in both; component rules use [data-theme="dark"] which
   also applies via styles.css system-preference logic. */

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --landing-grid: rgba(255, 255, 255, 0.07);
        --landing-grid-strong: rgba(255, 255, 255, 0.11);
        --landing-surface: rgba(16, 20, 18, 0.58);
        --landing-surface-strong: rgba(18, 23, 20, 0.76);
        --landing-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
        --landing-code: #090b09;
    }
}

:root[data-theme="dark"] {
    --landing-grid: rgba(255, 255, 255, 0.07);
    --landing-grid-strong: rgba(255, 255, 255, 0.11);
    --landing-surface: rgba(16, 20, 18, 0.58);
    --landing-surface-strong: rgba(18, 23, 20, 0.76);
    --landing-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
    --landing-code: #090b09;
}

/* Component-level dark overrides — deduplicated into a single block.
   theme-toggle.js sets [data-theme] from system preference before first paint,
   so [data-theme="dark"] covers both explicit toggle and system-preference dark mode.
   A @media fallback handles the edge case where JS hasn't run yet. */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) body::after { background: none; }
    :root:not([data-theme="light"]) #mycelium-background { opacity: 0.62; }
}

:root[data-theme="dark"] body::after { background: none; }
:root[data-theme="dark"] #mycelium-background { opacity: 0.62; }

:root[data-theme="dark"] .how-card,
:root[data-theme="dark"] .why-cap,
:root[data-theme="dark"] .model-cap,
:root[data-theme="dark"] .content-panel-shell { box-shadow: none; }

:root[data-theme="dark"] .landing-header .cta-install-command,
:root[data-theme="dark"] .content-panel-shell { color: var(--color-text-secondary); }

:root[data-theme="dark"] .landing-header .cta-install-command {
    border-color: rgba(126, 198, 153, 0.18);
    background: rgba(18, 24, 21, 0.8);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.16);
}

:root[data-theme="dark"] .landing-header .install-command-text { color: var(--color-ink); }
:root[data-theme="dark"] .landing-header .install-command-label { background: rgba(74, 140, 98, 0.14); color: var(--color-syntax-keyword); }

:root[data-theme="dark"] .landing-header .install-copy-btn {
    border-color: rgba(126, 198, 153, 0.16);
    background: rgba(74, 140, 98, 0.06);
    color: var(--color-text-secondary);
}

:root[data-theme="dark"] .landing-header .install-copy-btn:hover,
:root[data-theme="dark"] .landing-header .install-copy-btn:focus-visible {
    color: var(--color-syntax-keyword);
    border-color: rgba(126, 198, 153, 0.34);
    background: rgba(74, 140, 98, 0.12);
}

:root[data-theme="dark"] .landing-primary-cta {
    color: var(--color-ink);
    border-color: rgba(126, 198, 153, 0.22);
    background: rgba(74, 140, 98, 0.12);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.14), 0 4px 12px rgba(0, 0, 0, 0.1);
}

:root[data-theme="dark"] .landing-primary-cta:hover,
:root[data-theme="dark"] .landing-primary-cta:focus-visible {
    border-color: rgba(126, 198, 153, 0.42);
    background: rgba(74, 140, 98, 0.18);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18), 0 8px 16px rgba(0, 0, 0, 0.14);
}

:root[data-theme="dark"] .content-panel-shell {
    background: linear-gradient(180deg, rgba(18, 23, 20, 0.44), rgba(16, 20, 18, 0.22));
}

:root[data-theme="dark"] .demo-preview-shell {
    border-color: rgba(126, 198, 153, 0.14);
    background: transparent;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

:root[data-theme="dark"] .demo-preview-chrome {
    border-bottom-color: rgba(126, 198, 153, 0.08);
    background: rgba(15, 19, 17, 0.045);
}

:root[data-theme="dark"] .demo-preview-body { background: transparent; }

:root[data-theme="dark"] .demo-preview-playpill {
    border-color: rgba(126, 198, 153, 0.18);
    background: rgba(15, 19, 17, 0.44);
    color: var(--color-ink-soft);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 1px 12px rgba(0, 0, 0, 0.16);
}

:root[data-theme="dark"] .demo-preview:hover .demo-preview-shell,
:root[data-theme="dark"] .demo-preview:focus-visible .demo-preview-shell {
    border-color: rgba(126, 198, 153, 0.24);
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.14);
}

:root[data-theme="dark"] .demo-preview:hover .demo-preview-playpill,
:root[data-theme="dark"] .demo-preview:focus-visible .demo-preview-playpill {
    border-color: rgba(126, 198, 153, 0.28);
    background: rgba(18, 24, 21, 0.56);
    color: var(--color-ink);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 2px 14px rgba(0, 0, 0, 0.18);
}

:root[data-theme="dark"] .demo-preview:active .demo-preview-playpill {
    background: rgba(16, 21, 19, 0.5);
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.22), 0 1px 8px rgba(0, 0, 0, 0.14);
}

:root[data-theme="dark"] .answer-default::before {
    background: linear-gradient(180deg, rgba(18, 23, 20, 0.28), rgba(18, 23, 20, 0));
}

:root[data-theme="dark"] .answer-default::after {
    background: none;
    opacity: 0;
}

:root[data-theme="dark"] .panel-punchline {
    color: var(--color-text-secondary);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

:root[data-theme="dark"] .question-btn { color: var(--color-text-secondary); }
:root[data-theme="dark"] .question-btn:hover,
:root[data-theme="dark"] .question-btn:focus-visible,
:root[data-theme="dark"] .question-btn[aria-expanded="true"] {
    color: var(--color-accent);
}

:root[data-theme="dark"] .how-card,
:root[data-theme="dark"] .why-cap,
:root[data-theme="dark"] .model-cap {
    background: rgba(15, 19, 17, 0.66);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.06);
}

:root[data-theme="dark"] .how-card,
:root[data-theme="dark"] .why-cap {
    background: linear-gradient(180deg, rgba(74, 140, 98, 0.14), rgba(74, 140, 98, 0.06) 34%, rgba(15, 19, 17, 0.72) 100%);
}

:root[data-theme="dark"] .how-card::before,
:root[data-theme="dark"] .why-cap::before {
    background: linear-gradient(90deg, rgba(126, 198, 153, 0.38), rgba(126, 198, 153, 0));
}

:root[data-theme="dark"] .how-card-baseline { background: rgba(15, 19, 17, 0.66); }

:root[data-theme="dark"] .how-card-baseline::before {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.08), transparent);
}

:root[data-theme="dark"] .how-card-problem {
    background: linear-gradient(180deg, rgba(175, 137, 80, 0.14), rgba(175, 137, 80, 0.06) 34%, rgba(15, 19, 17, 0.72) 100%);
}

:root[data-theme="dark"] .how-card-problem::before {
    background: linear-gradient(90deg, rgba(200, 160, 80, 0.38), rgba(200, 160, 80, 0));
}

:root[data-theme="dark"] .how-card-resolved {
    background: linear-gradient(180deg, rgba(74, 140, 98, 0.24), rgba(74, 140, 98, 0.1) 34%, rgba(15, 19, 17, 0.72) 100%);
}

:root[data-theme="dark"] .how-card-resolved::before {
    background: linear-gradient(90deg, rgba(126, 198, 153, 0.62), rgba(126, 198, 153, 0));
}

:root[data-theme="dark"] .model-cap-title,
:root[data-theme="dark"] .footnote-brand,
:root[data-theme="dark"] .footnote-links a { color: var(--color-text-tertiary); }

:root[data-theme="dark"] .how-card-desc,
:root[data-theme="dark"] .model-cap-desc,
:root[data-theme="dark"] .anchor-line-2 { color: var(--color-text-secondary); }

:root[data-theme="dark"] .schematic-terminal,
:root[data-theme="dark"] .how-book-page {
    border-color: rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 20px 44px rgba(0, 0, 0, 0.28);
}

:root[data-theme="dark"] .schematic-terminal::before {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.24), rgba(255, 255, 255, 0.05));
    opacity: 0.7;
}

:root[data-theme="dark"] .premise-card {
    background: linear-gradient(90deg, rgba(74, 140, 98, 0.1), transparent 70%);
}

@media (max-height: 900px) and (min-width: 769px) {
    body {
        height: auto;
        min-height: 100vh;
        min-height: 100dvh;
        overflow-y: auto;
    }

    .landing-header {
        padding-block: var(--space-1);
    }

    .content-panel-shell {
        gap: var(--space-3);
        padding: var(--space-3);
    }

    .landing-content-stack {
        gap: var(--space-2);
    }

    .panel-body {
        gap: var(--space-1-5);
    }

    .panel-body-split {
        grid-template-columns: minmax(0, 0.88fr) minmax(17rem, 1.12fr);
        gap: var(--space-3);
    }

    .panel-prose-grid {
        gap: var(--space-2) var(--space-4);
    }

    .how-book-page,
    .schematic-terminal {
        font-size: var(--font-size-ui-nav);
        padding: var(--space-2) var(--space-3);
    }

}

@media (max-height: 760px) and (min-width: 769px) {
    .how-cards,
    .why-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .model-capabilities-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .panel-prose-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        height: auto;
        min-height: 100vh;
        min-height: 100dvh;
        overflow-y: auto;
        grid-template-columns: 1fr;
        grid-template-rows: auto minmax(0, 1fr) auto auto auto;
        grid-template-areas:
            "header"
            "main"
            "anchor-l"
            "anchor-r"
            "footnote";
    }

    body::before {
        display: none;
    }

    .landing-header {
        padding-inline: var(--space-2);
    }

    #main-footer.zone-footnote {
        padding: var(--space-1-5) var(--space-2);
    }

    .footnote-inner {
        flex-wrap: wrap;
    }

    .header-inner {
        flex-wrap: nowrap;
        gap: var(--space-1-5);
    }

    .header-actions {
        min-width: 0;
        gap: var(--space-1);
    }

    .landing-header .cta-install-command {
        min-width: 0;
        padding: 0.24rem 0.28rem 0.24rem 0.32rem;
    }

    .landing-header .install-command-label {
        padding: 0.42rem 0.44rem;
        font-size: var(--font-size-2xs);
    }

    .landing-header .install-command-text {
        white-space: nowrap;
        flex-shrink: 0;
        font-size: var(--font-size-xs);
        padding: 0.42rem 0.48rem;
    }

    .landing-header .install-copy-btn {
        width: 2.75rem;
        height: 2.75rem;
        flex-shrink: 0;
    }

    .landing-main {
        display: flex;
        flex-direction: column;
    }

    .zone-detail {
        display: flex;
        flex-direction: column;
        order: 1;
        border-left: 0;
        padding-left: 0;
    }

    .zone-content {
        order: 0;
        padding: var(--space-4) var(--space-3) var(--space-5);
        min-height: 18rem;
    }

    .question-list {
        width: 100%;
        max-width: 26rem;
        gap: 4px;
    }

    .landing-content-stack {
        gap: var(--space-3);
    }

    .question-btn {
        min-height: 44px;
        padding-block: 0.8rem;
        font-size: clamp(var(--font-size-xl), 5.6vw, 1.7rem);
        line-height: 1.28;
        transform: none !important;
    }

    /* On mobile, chevron indicates expand/collapse */
    .question-btn::after {
        content: "\2009\203A";
        opacity: 0.3;
        transform: rotate(90deg);
        transform-origin: center;
        transition: opacity var(--duration-normal) var(--ease-pando), transform var(--duration-normal) var(--ease-pando);
    }

    .question-btn[aria-expanded="true"]::after {
        opacity: 0.6;
        transform: rotate(-90deg);
    }

    .question-btn:hover::after,
    .question-btn:focus-visible::after {
        opacity: 0.6;
    }

    .landing-primary-cta {
        width: 100%;
    }

    .panel-layer {
        position: relative;
        order: 1;
        min-height: 0;
    }

    /* Fix 3: Mobile accordion — panels inline below questions */
    .content-panel,
    .content-panel[hidden] {
        position: relative;
        inset: auto;
        padding: 0 var(--space-3);
        border: 0;
        pointer-events: auto;
        display: grid;
        grid-template-rows: 0fr;
        opacity: 0;
        overflow: hidden;
        transition: grid-template-rows 280ms var(--ease-pando), opacity 280ms var(--ease-pando);
    }

    .content-panel > * {
        overflow: hidden;
    }

    .content-panel.is-active {
        grid-template-rows: 1fr;
        opacity: 1;
    }

    .content-panel.is-closing {
        grid-template-rows: 0fr;
        opacity: 0;
        transition: grid-template-rows 200ms var(--ease-pando), opacity 200ms var(--ease-pando);
    }

    .content-panel-shell {
        width: 100%;
        min-height: auto;
        gap: var(--space-2-5);
        padding: var(--space-3);
        margin-bottom: var(--space-3);
    }

    /* Hide panel prev/next nav on mobile — accordion doesn't need spatial nav */
    .panel-nav {
        position: relative;
        bottom: auto;
        left: auto;
        right: auto;
        justify-content: center;
        padding: 0 var(--space-3) var(--space-2);
    }

    .panel-nav-prev,
    .panel-nav-next,
    .panel-nav-spacer {
        display: none;
    }

    .panel-nav-close {
        font-size: var(--font-size-xs);
    }

    .answer-default {
        display: none;
    }

    .landing-demo-cta {
        display: inline-flex;
    }

    .demo-overlay {
        position: fixed;
        inset: 0;
        z-index: 100;
        align-items: center;
        justify-content: center;
        background: rgba(0, 0, 0, 0.9);
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--duration-slow) var(--ease-pando);
    }

    .demo-overlay-inner {
        width: 96vw;
        height: min(84vh, 140vw);
        min-height: 24rem;
    }

    .panel-body p.panel-punchline {
        font-size: clamp(var(--font-size-lg), 4.5vw, var(--font-size-xl));
        padding-bottom: var(--space-1-5);
        margin-bottom: 0;
    }

    .panel-body,
    .panel-body-readable,
    .panel-body-medium,
    .panel-body-wide {
        width: 100%;
        gap: var(--space-2);
    }

    .panel-body-split,
    .panel-body-split-compact {
        grid-template-columns: 1fr;
    }

    .panel-prose-grid,
    .panel-copy-stack {
        grid-template-columns: 1fr;
    }

    .panel-body p,
    .panel-lead,
    .how-card-desc,
    .model-cap-desc {
        max-width: none;
    }

    .token-headline,
    .toolkit-heading {
        max-width: 12ch;
    }

    .why-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2-5);
    }

    .panel-declaration {
        font-size: clamp(var(--font-size-lg), 5vw, var(--font-size-xl));
    }

    .panel-delivery-strip {
        flex-direction: column;
        gap: var(--space-1);
    }

    .token-headline {
        font-size: clamp(1.7rem, 8.5vw, 2.5rem);
    }

    .toolkit-heading {
        font-size: clamp(1.8rem, 8vw, 2.5rem);
        margin-bottom: 0;
    }

    .how-cards,
    .model-capabilities-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2-5);
    }

    .panel-body-answer-q5 .model-capabilities-grid {
        grid-template-columns: 1fr;
    }

    .how-card,
    .model-cap {
        min-height: auto;
    }

    .panel-body-answer-q3 .how-card {
        grid-template-rows: auto 1fr;
    }

    .how-card {
        gap: var(--space-2);
        padding: var(--space-2-5);
    }

    .how-book-page,
    .schematic-terminal {
        width: 100%;
        margin: var(--space-1) 0 0;
        padding: var(--space-2) var(--space-2-5);
    }

    .schematic-terminal::before {
        right: 0.8rem;
        width: 1.8rem;
    }

    .model-cap,
    .model-cap:nth-child(2n),
    .model-cap:nth-child(3n+1),
    .model-cap:nth-child(3n+2) {
        border-right: 0;
        padding-right: var(--space-3);
    }

    .model-cap {
        gap: var(--space-0-5);
        padding-bottom: var(--space-2-5);
    }

    .lang-strip {
        gap: var(--space-1) var(--space-2);
        margin-top: 0;
    }

    .lang-strip-list {
        white-space: normal;
    }

    .pivot-nowrap {
        font-size: clamp(0.7rem, 2.9vw, 0.88rem);
        letter-spacing: -0.015em;
    }

    .zone-anchor-l,
    .zone-anchor-r {
        padding-inline: var(--space-3);
    }

    .zone-anchor-l {
        border-right: 0;
        padding-top: var(--space-4);
        padding-bottom: var(--space-2);
    }

    .zone-anchor-r {
        border-top: 0;
        padding-top: 0;
        padding-bottom: var(--space-4);
    }

    .anchor-display {
        font-size: clamp(var(--font-size-3xl), 10vw, 3rem);
    }

    .footnote-inner {
        align-items: flex-start;
        gap: var(--space-1);
    }

    .footnote-links {
        justify-content: flex-start;
        gap: var(--space-2);
    }

}

@media (max-width: 420px) {
    .pivot-nowrap {
        white-space: normal;
        display: inline;
        font-size: inherit;
        letter-spacing: normal;
    }
}

/* Fix 5: Short viewport escape — prevent clipping on small screens */
@media (max-height: 640px) and (min-width: 769px) {
    body {
        height: auto;
        min-height: 100vh;
        min-height: 100dvh;
        overflow-y: auto;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0ms !important;
        animation-duration: 0ms !important;
        scroll-behavior: auto !important;
    }
}