/* W38 immersive grade selector and synchronized comparison. */
.grade-stage { position: relative; isolation: isolate; min-height: max(620px, calc(100svh - var(--site-sticky-top))); overflow: hidden; background: transparent; border: 0; }
.grade-stage-shell { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(210px, 240px) minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); grid-template-areas: "rail panels"; align-content: center; gap: clamp(20px, 3vw, 44px); width: min(100% - 48px, 1440px); min-height: max(620px, calc(100svh - var(--site-sticky-top))); margin-inline: auto; padding-block: 20px; }
.grade-stage-cart { position: absolute; top: 20px; right: 0; }
.grade-rail { grid-area: rail; display: grid; min-width: 0; min-height: 440px; align-self: center; align-content: stretch; padding: 7px; background: var(--surface-1); border: 1px solid var(--surface-border); border-radius: calc(var(--radius-card) + 4px); box-shadow: var(--mb-shadow); }
.grade-rail-tabs { display: grid; height: 100%; grid-template-rows: repeat(5, minmax(0, 1fr)); gap: 5px; }
.grade-rail-tab { --grade-tier-accent: var(--surface-border); --grade-tier-label: var(--mb-fg1); position: relative; display: grid; grid-template-columns: minmax(0, 1fr); min-width: 0; min-height: 0; align-items: center; padding: 10px 12px; color: var(--mb-fg2); background: color-mix(in srgb, var(--grade-tier-accent) 3%, transparent); border: 1px solid color-mix(in srgb, var(--grade-tier-accent) 20%, transparent); border-left-width: 3px; border-left-color: color-mix(in srgb, var(--grade-tier-accent) 66%, transparent); border-radius: calc(var(--radius-card) - 1px); box-shadow: none; text-align: left; transition: color var(--dur-fast) var(--ease-out),
        background var(--dur-fast) var(--ease-out),
        border-color var(--dur-fast) var(--ease-out),
        box-shadow var(--dur-fast) var(--ease-out),
        transform var(--dur-fast) var(--spring-soft); }
.grade-rail-tab.tier-bronze { --grade-tier-accent: var(--coco-orange-400); --grade-tier-label: var(--coco-orange-300); }
.grade-rail-tab.tier-silver { --grade-tier-accent: var(--coco-stone-200); --grade-tier-label: var(--coco-stone-100); }
.grade-rail-tab.tier-gold { --grade-tier-accent: var(--coco-gold-300); --grade-tier-label: var(--coco-gold-100); }
.grade-rail-tab.tier-champion { --grade-tier-accent: var(--coco-sea-300); --grade-tier-label: var(--coco-sea-200); }
.grade-rail-tab.tier-master { --grade-tier-accent: var(--mb-outline); --grade-tier-label: var(--coco-stone-100); background: color-mix(in srgb, var(--mb-outline) 42%, var(--surface-2)); border-color: var(--mb-outline); box-shadow: inset 3px 0 0 var(--coco-stone-400), 2px 2px 0 var(--mb-outline); }
.grade-rail-tab:hover { color: var(--mb-fg1); background: color-mix(in srgb, var(--grade-tier-accent) 8%, var(--surface-2)); border-color: color-mix(in srgb, var(--grade-tier-accent) 40%, var(--surface-border)); transform: translateX(2px); }
.grade-rail-tab.is-active { color: var(--mb-fg1); background: color-mix(in srgb, var(--grade-tier-accent) 13%, var(--surface-3)); border-color: color-mix(in srgb, var(--grade-tier-accent) 58%, var(--surface-border)); box-shadow: inset 3px 0 0 var(--grade-tier-accent); transform: none; }
.grade-rail-tab.tier-gold.is-active { background: color-mix(in srgb, var(--coco-gold-300) 17%, var(--surface-3)); border-color: color-mix(in srgb, var(--coco-gold-300) 76%, var(--surface-border)); box-shadow: inset 4px 0 0 var(--coco-gold-300), 0 0 0 1px color-mix(in srgb, var(--coco-gold-200) 20%, transparent); }
.grade-rail-tab.tier-master:hover,
.grade-rail-tab.tier-master.is-active { background: color-mix(in srgb, var(--mb-outline) 68%, var(--surface-2)); border-color: var(--mb-outline); box-shadow: inset 4px 0 0 var(--coco-stone-400), 3px 3px 0 var(--mb-outline); }
.grade-rail-copy { display: grid; min-width: 0; gap: 4px; }
.grade-rail-name { overflow: hidden; color: var(--grade-tier-label); font-family: var(--font-display); font-size: 14px; font-weight: 850; text-overflow: ellipsis; white-space: nowrap; }
.grade-rail-tab.tier-gold .grade-rail-name { font-weight: 900; }
.grade-rail-copy small { color: var(--mb-fg2); font-size: 11px; font-weight: 750; line-height: 1.3; }
.grade-rail-tab.is-active .grade-rail-copy small { color: var(--mb-fg1); }
.grade-rail-controls { display: none; grid-template-columns: 44px minmax(0, 1fr) 44px; align-items: center; gap: 7px; color: var(--mb-fg3); font-size: 11px; text-align: center; }
.grade-rail-controls strong { color: var(--mb-fg1); font-family: var(--font-mc); }
.grade-arrow { display: grid; width: 44px; height: 44px; place-items: center; color: var(--mb-fg1); background: var(--surface-2); border: 1px solid var(--surface-border); border-radius: calc(var(--radius-card) + 3px); box-shadow: 2px 2px 0 color-mix(in srgb, var(--mb-outline) 72%, transparent); transition: color var(--dur-fast) var(--ease-out),
        background var(--dur-fast) var(--ease-out),
        transform var(--dur-fast) var(--spring-soft); }
.grade-arrow:hover:not(:disabled) { color: var(--coco-gold-100); background: color-mix(in srgb, var(--coco-gold-300) 9%, var(--surface-2)); transform: translateY(-1px); }
.grade-arrow:disabled { opacity: .42; cursor: not-allowed; }
.grade-arrow svg, .grade-arrow i { width: 18px; height: 18px; }
.grade-stage-panels { grid-area: panels; min-width: 0; align-self: center; }
.grade-stage-panel { display: grid; grid-template-columns: minmax(220px, .78fr) minmax(340px, 1fr); min-width: 0; align-items: center; gap: clamp(18px, 2.8vw, 40px); }
.grade-stage-panel[hidden] { display: none; }
.grade-stage-panel.is-forward { --grade-enter-x: 10px; }
.grade-stage-panel.is-backward { --grade-enter-x: -10px; }
.grade-stage-panel.is-active .grade-visual-texture,
.grade-stage-panel.is-active .grade-visual-missing { animation: grade-texture-in 180ms var(--ease-out) both; }
.grade-stage-panel.is-active .grade-decision { animation: grade-decision-in 160ms var(--ease-out) both; }
@keyframes grade-texture-in {
    from { opacity: .68; transform: translateX(var(--grade-enter-x, 0)) scale(.985); }
    to { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes grade-decision-in {
    from { opacity: .76; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}
.grade-visual { position: relative; display: grid; min-width: 0; min-height: clamp(260px, 38vh, 390px); place-items: center; overflow: visible; background: transparent; border: 0; box-shadow: none; }
.grade-visual::before { content: none; }
.grade-visual-halo { display: none; }
.grade-visual-texture { position: relative; z-index: 1; width: min(78%, 360px); height: auto; max-height: 250px; object-fit: contain; image-rendering: pixelated; filter: drop-shadow(7px 9px 0 var(--mb-outline)); }
.grade-visual-missing { position: relative; z-index: 1; display: grid; max-width: 180px; place-items: center; gap: 10px; color: var(--mb-fg3); font-size: 12px; font-weight: 800; text-align: center; }
.grade-visual-missing svg, .grade-visual-missing i { width: 30px; height: 30px; }
.grade-decision { display: grid; min-width: 0; gap: 14px; padding: 18px; background: var(--surface-2); border: 1px solid var(--surface-border); border-radius: calc(var(--radius-card) + 5px); box-shadow: var(--mb-shadow); }
.grade-offer-summary { display: grid; gap: 10px; padding: 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; }
.grade-decision-heading { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 4px 12px; }
.grade-decision-heading h2 { margin: 0; color: var(--coco-gold-100); font-family: var(--font-display); font-size: clamp(28px, 3.2vw, 39px); font-weight: 780; letter-spacing: -.02em; line-height: 1.05; }
.grade-recommended { display: inline-flex; min-height: 28px; align-items: center; padding: 5px 9px; color: var(--coco-gold-100); background: color-mix(in srgb, var(--coco-gold-300) 12%, var(--surface-3)); border: 1px solid color-mix(in srgb, var(--coco-gold-300) 46%, var(--surface-border)); border-radius: calc(var(--radius-card) + 2px); box-shadow: inset 0 -2px 0 color-mix(in srgb, var(--coco-gold-400) 48%, transparent); font-size: 9px; font-weight: 900; text-transform: uppercase; }
.grade-recommended.is-highest { color: var(--mb-fg1); background: var(--surface-3); border-color: var(--surface-border); box-shadow: none; }
.grade-key-benefits { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 0; padding: 7px 0; overflow: visible; background: transparent; border: 0; border-radius: 0; box-shadow: none; list-style: none; }
.grade-key-benefits li { display: grid; grid-template-columns: 20px minmax(0, 1fr); min-width: 0; align-items: center; gap: 7px; padding: 7px 4px; background: transparent; border: 0; }
.grade-key-benefits li > svg, .grade-key-benefits li > i { width: 17px; height: 17px; color: var(--coco-leaf-200); }
.grade-key-benefits li > span { display: grid; gap: 1px; }
.grade-key-benefits small { color: var(--mb-fg2); font-size: 9px; font-weight: 850; letter-spacing: .04em; text-transform: uppercase; }
.grade-key-benefits strong { color: var(--mb-fg1); font-size: 11px; font-weight: 800; line-height: 1.25; }
.grade-purchase { display: grid; gap: 11px; padding: 5px 0 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; }
.grade-price { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: end; gap: 2px 9px; }
.grade-price .coco-price { color: var(--coco-gold-100); font-family: var(--font-display); font-size: clamp(31px, 3.3vw, 40px); font-variant-numeric: tabular-nums; font-weight: 680; letter-spacing: -.025em; line-height: 1; text-shadow: none; }
.grade-price.is-settling .coco-price { animation: grade-price-settle 180ms var(--ease-out) both; }
@keyframes grade-price-settle {
    from { opacity: .68; transform: translateY(3px); }
    to { opacity: 1; transform: translateY(0); }
}
.grade-price > span:nth-child(2) { padding-bottom: 5px; color: var(--mb-fg2); font-size: 11px; font-weight: 750; }
.grade-price small { grid-column: 1 / -1; min-height: 18px; color: var(--mb-fg2); font-size: 10px; font-weight: 650; }
.grade-payment-note { display: grid; width: 100%; grid-template-columns: 15px minmax(0, 1fr); justify-self: stretch; align-items: start; gap: 7px; padding: 0; color: var(--mb-fg2); background: transparent; border: 0; border-radius: 0; font-size: 10px; font-weight: 650; line-height: 1.45; }
.grade-payment-note svg, .grade-payment-note i { width: 15px; height: 15px; margin-top: 0; color: var(--coco-leaf-200); }
.grade-actions { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px; }
.grade-detail-link { display: inline-flex; min-height: 44px; align-items: center; gap: 6px; padding-inline: 10px; color: var(--coco-gold-100); background: transparent; border: 0; border-radius: calc(var(--radius-card) + 2px); box-shadow: none; font-size: 11px; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
.grade-detail-link:hover { color: var(--coco-gold-200); background: var(--surface-3); }
.grade-detail-link svg, .grade-detail-link i { width: 14px; height: 14px; }
.grade-decision .shop-duration-control { padding: 8px 0 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; }
.grade-details-section { display: block; width: min(100% - 48px, 960px); margin-inline: auto; margin-block: clamp(42px, 7vw, 76px); overflow: visible; background: transparent; border: 0; box-shadow: none; }
.grade-details-disclosure { min-width: 0; background: transparent; border: 0; border-radius: calc(var(--radius-card) + 4px); }
.grade-details-disclosure,
.grade-comparison-details { scroll-margin-top: calc(var(--site-sticky-top) + 12px); }
.grade-details-disclosure > summary { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 18px; color: var(--mb-fg1); background: var(--surface-2); border: 1px solid var(--surface-border); border-radius: calc(var(--radius-card) + 4px); box-shadow: var(--mb-shadow); cursor: pointer; list-style: none; text-align: left; }
.grade-details-disclosure > summary::-webkit-details-marker { display: none; }
.grade-details-disclosure > summary strong { display: flex; min-width: 0; flex-wrap: wrap; gap: 0 5px; font-family: var(--font-display); font-size: 17px; font-weight: 900; }
.grade-details-active-name { color: var(--coco-gold-100); }
.grade-details-chevron { width: 18px; height: 18px; flex: 0 0 auto; color: var(--mb-fg3); transition: transform var(--dur-fast) var(--ease-out); }
.grade-details-disclosure[open] { box-shadow: var(--mb-shadow); }
.grade-details-disclosure[open] > summary { border-radius: calc(var(--radius-card) + 4px) calc(var(--radius-card) + 4px) 0 0; box-shadow: none; }
.grade-details-disclosure[open] .grade-details-chevron { transform: rotate(180deg); }
.grade-detail-panels { margin: 0; padding: 12px 22px 22px; background: var(--surface-1); border: 1px solid var(--surface-border); border-top: 0; border-radius: 0 0 calc(var(--radius-card) + 4px) calc(var(--radius-card) + 4px); box-shadow: none; }
.grade-details-disclosure[open] .grade-detail-panels,
.grade-comparison-details[open] .grade-comparison-scroll { animation: grade-disclosure-in 180ms var(--ease-out) both; }
@keyframes grade-disclosure-in {
    from { opacity: .7; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}
.grade-detail-panel { display: grid; gap: 16px; }
.grade-detail-panel[hidden] { display: none; }
.grade-benefit-groups { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 30px; align-items: start; }
.grade-benefit-group { min-width: 0; }
.grade-benefit-group > h3 { display: inline-flex; margin: 0 0 7px; padding: 6px 9px; color: var(--coco-gold-100); background: var(--surface-2); border-radius: calc(var(--radius-card) - 1px); font-family: var(--font-display); font-size: 13px; font-weight: 850; }
.grade-benefit-group dl { display: grid; gap: 5px; margin: 0; }
.grade-benefit-group dl > div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(90px, auto); gap: 10px; padding: 4px 0; border: 0; }
.grade-benefit-group dt { min-width: 0; color: var(--mb-fg2); font-size: 11px; line-height: 1.4; }
.grade-benefit-group dd { margin: 0; color: var(--mb-fg1); font-size: 11px; font-weight: 800; text-align: right; overflow-wrap: anywhere; }
.grade-benefit-empty { color: var(--mb-fg3); font-size: 13px; }
.grade-comparison-section { display: block; width: min(100% - 48px, 1440px); margin-inline: auto; padding-block: clamp(48px, 8vw, 88px); }
.grade-comparison-details { width: 100%; overflow: visible; background: transparent; border: 0; }
.grade-comparison-details > summary { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 18px; color: var(--mb-fg1); background: var(--surface-2); border: 1px solid var(--surface-border); border-radius: calc(var(--radius-card) + 4px); box-shadow: var(--mb-shadow); cursor: pointer; list-style: none; }
.grade-comparison-details > summary::-webkit-details-marker { display: none; }
.grade-comparison-details > summary strong { font-family: var(--font-display); font-size: 16px; font-weight: 900; }
.grade-comparison-chevron { width: 18px; height: 18px; flex: 0 0 auto; color: var(--mb-fg3); transition: transform var(--dur-fast) var(--ease-out); }
.grade-comparison-details[open] { border-radius: calc(var(--radius-card) + 4px); box-shadow: var(--mb-shadow); }
.grade-comparison-details[open] > summary { border-radius: calc(var(--radius-card) + 4px) calc(var(--radius-card) + 4px) 0 0; box-shadow: none; }
.grade-comparison-details[open] .grade-comparison-chevron { transform: rotate(180deg); }
.grade-comparison-scroll { margin-top: 0; overflow-x: auto; overscroll-behavior-inline: contain; background: var(--surface-1); border: 1px solid var(--surface-border); border-top: 0; border-radius: 0 0 calc(var(--radius-card) + 4px) calc(var(--radius-card) + 4px); }
.grade-comparison-table { width: 100%; min-width: 1120px; border-collapse: collapse; border-spacing: 0; background: var(--surface-1); font-size: 11px; }
.grade-comparison-table th, .grade-comparison-table td { padding: 11px 12px; background: transparent; border: 0; border-right: 1px solid color-mix(in srgb, var(--surface-border) 78%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--surface-border) 78%, transparent); text-align: center; transition: background var(--dur-fast) var(--ease-out); }
.grade-comparison-table tr > *:last-child { border-right: 0; }
.grade-comparison-table th:first-child { position: sticky; z-index: 1; left: 0; width: 210px; color: var(--mb-fg1); background: var(--surface-2); text-align: left; }
.grade-comparison-table thead th { color: var(--mb-fg1); background: var(--surface-3); border-bottom-color: var(--surface-border); }
.grade-comparison-tier { display: grid; min-width: 92px; place-items: center; gap: 5px; }
.grade-comparison-tier img { width: auto; height: 28px; max-width: 96px; object-fit: contain; image-rendering: pixelated; }
.grade-comparison-tier strong { font-family: var(--font-display); font-size: 11px; }
.grade-comparison-category th { position: static; color: var(--coco-gold-100); background: color-mix(in srgb, var(--coco-wood-300) 35%, var(--surface-3)); border-right: 0; font-family: var(--font-display); font-size: 11px; letter-spacing: .04em; text-transform: uppercase; }
.grade-comparison-table td { color: var(--mb-fg2); font-weight: 750; }
.grade-comparison-table .is-empty { color: var(--mb-fg3); font-weight: 500; }
.grade-comparison-table tbody:last-child tr:last-child > * { border-bottom: 0; }
.grade-comparison-table .is-active-tier { background: color-mix(in srgb, var(--coco-gold-300) 10%, var(--surface-1)); box-shadow: inset 1px 0 0 color-mix(in srgb, var(--coco-gold-300) 36%, transparent), inset -1px 0 0 color-mix(in srgb, var(--coco-gold-300) 36%, transparent); }
@media (min-width: 1101px) {
    .grade-stage-shell { grid-template-rows: minmax(0, 1fr); grid-template-areas: "rail panels"; width: min(100% - 48px, 1360px); }
    .grade-stage-panel { width: min(100%, 1080px); margin-inline: auto; gap: clamp(28px, 3.4vw, 52px); }
}
@media (max-width: 1100px) {
    .grade-stage-shell { width: min(100% - 32px, 1280px); grid-template-columns: 210px minmax(0, 1fr); gap: 20px; }
    .grade-stage-panel { grid-template-columns: minmax(190px, .65fr) minmax(320px, 1fr); gap: 20px; }
}
@media (max-width: 899px) {
    .grade-stage { min-height: calc(100svh - var(--site-sticky-top)); }
    .grade-stage-shell { grid-template-columns: minmax(0, 1fr); grid-template-areas: "rail"
            "panels"; align-content: start; gap: 18px; width: min(100% - 24px, 720px); min-height: auto; padding-block: 24px 30px; }
    .grade-stage-shell.has-cart { padding-top: 82px; }
    .grade-stage-cart { top: 24px; right: 0; width: 48px; padding-inline: 0; }
    .grade-stage-cart > span:not(.shop-cart-count) { display: none; }
    .grade-stage-panel { grid-template-columns: minmax(0, 1fr); gap: 14px; }
    .grade-visual { min-height: clamp(140px, 20vh, 180px); }
    .grade-visual-texture { width: min(68%, 280px); max-height: 130px; }
    .grade-decision { gap: 13px; padding: 16px; }
    .grade-decision-heading h2 { font-size: clamp(26px, 8vw, 38px); }
    .grade-key-benefits { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .grade-key-benefits li { grid-template-columns: 18px minmax(0, 1fr); align-content: start; padding: 7px; }
    .grade-key-benefits li > svg, .grade-key-benefits li > i { width: 15px; height: 15px; }
    .grade-key-benefits small { display: none; }
    .grade-key-benefits strong { font-size: 10px; }
    .grade-rail { min-height: 0; gap: 0; padding: 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; }
    .grade-rail-tabs { display: flex; height: auto; grid-template-rows: none; gap: 8px; padding: 3px 10vw 5px; overflow-x: auto; scroll-padding-inline: 10vw; scroll-snap-type: x mandatory; scrollbar-width: none; }
    .grade-rail-tabs::-webkit-scrollbar { display: none; }
    .grade-rail-tab { min-height: 64px; flex: 0 0 min(76vw, 300px); background: color-mix(in srgb, var(--grade-tier-accent) 5%, var(--surface-1)); border: 1px solid color-mix(in srgb, var(--grade-tier-accent) 30%, var(--surface-border)); border-left: 3px solid var(--grade-tier-accent); border-radius: calc(var(--radius-card) + 3px); scroll-snap-align: center; }
    .grade-rail-tab:hover, .grade-rail-tab.is-active { transform: translateY(-2px); }
    .grade-rail-controls { display: none; }
    .grade-details-section { grid-template-columns: minmax(0, 1fr); width: min(100% - 24px, 960px); gap: 0; }
    .grade-benefit-groups { grid-template-columns: minmax(0, 1fr); }
    .grade-comparison-section { grid-template-columns: minmax(0, 1fr); }
    .grade-comparison-details { grid-column: 1; }
}
@media (max-width: 520px) {
    .grade-decision { padding: 14px; }
    .grade-recommended { min-height: 28px; padding-inline: 7px; font-size: 9px; }
    .grade-key-benefits { grid-template-columns: minmax(0, 1fr); }
    .grade-key-benefits li { grid-template-columns: 20px minmax(0, 1fr); padding: 7px 9px; }
    .grade-key-benefits small { display: block; }
    .grade-key-benefits strong { font-size: 11px; }
    .grade-actions { grid-template-columns: minmax(0, 1fr); }
    .grade-detail-link { justify-content: center; }
    .grade-comparison-details > summary { min-height: 68px; padding: 12px 13px; }
}
@media (max-width: 350px) {
    .grade-stage-shell { width: min(100% - 16px, 720px); }
    .grade-stage-cart { width: 44px; }
    .grade-decision-heading { grid-template-columns: minmax(0, 1fr); }
    .grade-recommended { justify-self: start; }
    .shop-duration-control { margin-inline: -4px; padding: 9px; }
}
@media (prefers-reduced-motion: reduce) {
    .grade-stage-panel.is-active .grade-visual-texture,
    .grade-stage-panel.is-active .grade-visual-missing,
    .grade-stage-panel.is-active .grade-decision,
    .grade-price.is-settling .coco-price,
    .grade-details-disclosure[open] .grade-detail-panels,
    .grade-comparison-details[open] .grade-comparison-scroll { animation: none; }
    .grade-rail-tab { transition: none; }
    .grade-rail-tab:hover { transform: none; }
    .grade-visual-halo { filter: none; }
    .grade-details-chevron { transition: none; }
}
@media (forced-colors: active) {
    .grade-rail-tab.is-active, .grade-recommended, .grade-comparison-table .is-active-tier { outline: 2px solid Highlight; outline-offset: 1px; }
}