.review-toolbar {
    position: sticky;
    z-index: 100;
    top: 0;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 10px 20px;
    border-bottom: 1px solid var(--color-border);
    background: rgba(8, 8, 8, 0.97);
    backdrop-filter: blur(12px);
}

.review-title,
.review-controls,
.variant-tabs {
    display: flex;
    align-items: center;
}

.review-title {
    gap: 11px;
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    letter-spacing: 0.12em;
    white-space: nowrap;
}

.review-title small {
    padding-left: 10px;
    border-left: 1px solid var(--color-border);
    color: var(--color-accent);
    font-size: 0.56rem;
}

.review-mark {
    width: 9px;
    height: 9px;
    border: 1px solid var(--color-accent);
    transform: rotate(22deg);
}

.review-controls {
    gap: 18px;
}

.variant-tabs {
    gap: 10px;
}

.variant-tabs button {
    padding: 9px 11px;
    border: 1px solid var(--color-border);
    color: var(--color-dim);
    background: transparent;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    letter-spacing: 0.08em;
    cursor: pointer;
}

.variant-tabs button:hover,
.variant-tabs button:focus-visible,
.variant-tabs button[aria-selected="true"] {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.prototype-variant {
    min-height: calc(100vh - 70px);
    padding: clamp(70px, 8vw, 120px) 0;
    background: #121212;
}

.prototype-variant[hidden] {
    display: none;
}

.study-container {
    max-width: 1540px;
}

.text-link {
    display: inline-block;
    padding-bottom: 7px;
    border-bottom: 1px solid var(--color-accent);
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.67rem;
    letter-spacing: 0.12em;
    text-decoration: none;
}

.text-link:hover,
.text-link:focus-visible {
    color: #fff;
}

/* Variant 01 — Credits First */
.credits-first-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(520px, 1.1fr);
    gap: clamp(60px, 9vw, 150px);
    align-items: end;
}

.credits-lead h1 {
    margin: 18px 0 24px;
    font-size: clamp(4.4rem, 8vw, 8.5rem);
    line-height: 0.82;
}

.credits-lead h1 span {
    color: var(--color-accent);
}

.credits-lead p {
    max-width: 620px;
    margin-bottom: 34px;
    color: #bbb;
    font-size: 1.12rem;
}

.credit-ledger {
    border-top: 1px solid var(--color-border);
}

.credit-ledger a {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 110px 24px;
    gap: 18px;
    align-items: center;
    min-height: 94px;
    padding: 0 20px;
    border-bottom: 1px solid var(--color-border);
    color: #fff;
    text-decoration: none;
    transition: background 180ms ease, padding 180ms ease;
}

.credit-ledger a:hover,
.credit-ledger a:focus-visible {
    padding-right: 14px;
    padding-left: 26px;
    background: rgba(212, 175, 55, 0.07);
}

.credit-ledger strong {
    font-family: var(--font-head);
    font-size: 2rem;
    font-weight: 500;
    letter-spacing: 0.06em;
}

.credit-ledger small,
.credit-number,
.watch-mark {
    color: #777;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
}

.watch-mark {
    color: var(--color-accent);
    font-size: 1rem;
}

.credit-filmstrip {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
    margin-top: clamp(60px, 8vw, 110px);
}

.credit-filmstrip a {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #080808;
}

.credit-filmstrip img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    filter: grayscale(1) brightness(0.58);
    transition: filter 240ms ease, transform 400ms ease;
}

.credit-filmstrip a:hover img,
.credit-filmstrip a:focus-visible img {
    filter: grayscale(0.25) brightness(0.86);
    transform: scale(1.025);
}

.play-icon {
    position: absolute;
    inset: 50% auto auto 50%;
    width: 42px;
    height: 42px;
    border: 1px solid rgba(255,255,255,0.75);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.play-icon::after {
    position: absolute;
    top: 50%;
    left: 54%;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 9px solid #fff;
    content: "";
    transform: translate(-50%, -50%);
}

/* Variant 02 — Screen Stage */
.section-intro {
    max-width: 900px;
    margin-bottom: 52px;
}

.section-intro h2 {
    margin: 14px 0 16px;
    font-size: clamp(4.4rem, 8vw, 8rem);
}

.section-intro p {
    max-width: 760px;
    margin: 0;
    color: #bbb;
    font-size: 1.12rem;
}

.stage-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.7fr) minmax(340px, 0.7fr);
    min-height: 700px;
    border: 1px solid var(--color-border);
    background: #0b0b0b;
}

.screen-stage {
    position: relative;
    min-height: 700px;
    overflow: hidden;
}

.screen-panel {
    position: absolute;
    inset: 0;
}

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

.screen-panel > img,
.screen-shade {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.screen-panel > img {
    object-fit: cover;
}

.screen-shade {
    background: linear-gradient(0deg, rgba(4,4,4,0.96) 0%, rgba(4,4,4,0.35) 55%, rgba(4,4,4,0.08) 100%);
}

.screen-copy {
    position: absolute;
    z-index: 2;
    right: clamp(26px, 5vw, 70px);
    bottom: clamp(28px, 5vw, 64px);
    left: clamp(26px, 5vw, 70px);
}

.screen-copy > span {
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.13em;
}

.screen-copy h3 {
    margin: 10px 0 6px;
    font-size: clamp(4rem, 7vw, 7rem);
}

.screen-copy .btn {
    margin-top: 18px;
}

.screen-index {
    display: grid;
    grid-template-rows: repeat(5, 1fr);
    border-left: 1px solid var(--color-border);
}

.screen-index button {
    display: grid;
    grid-template-columns: 34px 1fr;
    grid-template-areas: "number title" "number source";
    align-content: center;
    gap: 3px 13px;
    padding: 18px 24px;
    border: 0;
    border-bottom: 1px solid var(--color-border);
    color: #fff;
    background: transparent;
    text-align: left;
    cursor: pointer;
}

.screen-index button:last-child {
    border-bottom: 0;
}

.screen-index button span {
    grid-area: number;
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.62rem;
}

.screen-index button strong {
    grid-area: title;
    font-family: var(--font-head);
    font-size: 1.7rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.screen-index button small {
    grid-area: source;
    color: #777;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    letter-spacing: 0.11em;
}

.screen-index button:hover,
.screen-index button:focus-visible,
.screen-index button.is-active {
    background: rgba(212, 175, 55, 0.08);
    box-shadow: inset 3px 0 0 var(--color-accent);
}

.stage-intel-link {
    margin-top: 30px;
}

/* Variant 03 — Evidence Wall */
.wall-intro {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.65fr);
    gap: 80px;
    align-items: end;
    margin-bottom: 55px;
}

.wall-intro h2 {
    margin: 16px 0 0;
    font-size: clamp(4.6rem, 8vw, 8.4rem);
    line-height: 0.84;
}

.wall-intro-copy p {
    margin-bottom: 28px;
    color: #bbb;
    font-size: 1.1rem;
}

.wall-intro-copy .evidence-disclaimer {
    margin: -10px 0 26px;
    color: #777;
    font-size: 0.72rem;
    line-height: 1.55;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.evidence-wall {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-rows: minmax(280px, 29vw);
    gap: 10px;
}

.wall-card {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: #080808;
    text-decoration: none;
}

.wall-card:nth-child(6n + 1),
.wall-card:nth-child(6n + 5) {
    grid-column: span 2;
}

.wall-card img,
.wall-shade {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.wall-card img {
    object-fit: cover;
    filter: grayscale(1) brightness(0.66);
    transition: filter 300ms ease, transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.wall-shade {
    background: linear-gradient(0deg, rgba(4,4,4,0.94), rgba(4,4,4,0.05) 72%);
}

.wall-copy {
    position: absolute;
    z-index: 2;
    right: 24px;
    bottom: 24px;
    left: 24px;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: end;
}

.wall-copy small {
    grid-column: 1 / -1;
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.58rem;
    letter-spacing: 0.12em;
}

.wall-copy strong {
    font-family: var(--font-head);
    font-size: clamp(2.3rem, 4vw, 4rem);
    font-weight: 500;
    letter-spacing: 0.05em;
}

.wall-copy em {
    padding-bottom: 8px;
    color: #aaa;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    font-style: normal;
    letter-spacing: 0.1em;
}

.wall-card:hover img,
.wall-card:focus-visible img {
    filter: grayscale(0.15) brightness(0.86);
    transform: scale(1.025);
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

@media (max-width: 1100px) {
    .review-toolbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .review-controls {
        width: 100%;
        justify-content: space-between;
    }

    .variant-tabs {
        max-width: calc(100vw - 115px);
        overflow-x: auto;
        padding-bottom: 4px;
    }

    .variant-tabs button {
        white-space: nowrap;
    }

    .review-title small {
        display: none;
    }

    .credits-first-layout,
    .wall-intro {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .credit-filmstrip {
        grid-template-columns: repeat(3, 1fr);
    }

    .stage-layout {
        grid-template-columns: 1fr;
    }

    .screen-index {
        grid-template-columns: repeat(5, minmax(170px, 1fr));
        grid-template-rows: 1fr;
        overflow-x: auto;
        border-top: 1px solid var(--color-border);
        border-left: 0;
    }

    .screen-index button {
        min-height: 112px;
        border-right: 1px solid var(--color-border);
        border-bottom: 0;
    }

    .evidence-wall {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: minmax(280px, 42vw);
    }
}

@media (max-width: 700px) {
    .prototype-variant {
        padding: 54px 0 86px;
    }

    .credits-lead h1,
    .wall-intro h2,
    .section-intro h2 {
        font-size: clamp(3.5rem, 17vw, 5.3rem);
    }

    .credit-ledger a {
        grid-template-columns: 32px minmax(0, 1fr) 22px;
        gap: 10px;
        min-height: 84px;
        padding: 0 10px;
    }

    .credit-ledger small {
        display: none;
    }

    .credit-ledger strong {
        font-size: 1.55rem;
    }

    .credit-filmstrip {
        grid-template-columns: 1fr 1fr;
    }

    .credit-filmstrip a:first-child {
        grid-column: 1 / -1;
    }

    .screen-stage {
        min-height: 570px;
    }

    .screen-copy h3 {
        font-size: clamp(3.2rem, 15vw, 5rem);
    }

    .evidence-wall {
        grid-template-columns: 1fr;
        grid-auto-rows: minmax(300px, 72vw);
    }

    .wall-card:nth-child(6n + 1),
    .wall-card:nth-child(6n + 5) {
        grid-column: auto;
    }

    .wall-copy strong {
        font-size: 2.7rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}

/* V1.1: professional context follows the explanation of OMNI. */
#evidence .wall-intro h2 { font-size: clamp(3.3rem, 6.6vw, 6.6rem); line-height: .9; }
#evidence .marquee-wrapper { margin: 0 0 42px; }
@media (max-width: 700px) {
    #evidence .wall-intro h2 { font-size: clamp(2.7rem, 12vw, 4.4rem); }
}