/* ========================================
   Case Study — evidence-first editorial layout
   ======================================== */

.case-study-page {
    --case-ink: #17191f;
    --case-paper: #f5f3ee;
    --case-line: rgba(23, 25, 31, 0.14);
    background: var(--case-paper);
    color: var(--case-ink);
}

.case-hero {
    position: relative;
    overflow: hidden;
    padding: clamp(4.5rem, 10vw, 8.5rem) 0 clamp(3.5rem, 7vw, 6rem);
    color: #fff;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px) 0 0 / 72px 72px,
        linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px) 0 0 / 72px 72px,
        radial-gradient(circle at 84% 18%, rgba(255, 136, 0, 0.3), transparent 30%),
        linear-gradient(145deg, #111319 0%, #242833 58%, #14161c 100%);
}

.case-hero::before {
    content: '';
    position: absolute;
    top: -22%;
    right: -8%;
    width: min(46vw, 640px);
    aspect-ratio: 1;
    border: 1px solid rgba(255, 153, 51, 0.24);
    border-radius: 50%;
    box-shadow: 0 0 0 56px rgba(255, 136, 0, 0.035), 0 0 0 112px rgba(255, 136, 0, 0.02);
    pointer-events: none;
}

.case-hero .container {
    position: relative;
    z-index: 1;
}

.case-breadcrumb {
    margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.case-breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.55rem;
    margin: 0;
    padding: 0;
    list-style: none;
    color: rgba(255, 255, 255, 0.58);
    font-size: 0.82rem;
}

.case-breadcrumb li:not(:last-child)::after {
    content: '/';
    margin-left: 0.55rem;
    color: rgba(255, 255, 255, 0.28);
}

.case-breadcrumb a {
    color: rgba(255, 255, 255, 0.72);
    text-decoration: none;
}

.case-breadcrumb a:hover {
    color: #ffad5c;
}

.case-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.65fr);
    gap: clamp(2.5rem, 7vw, 6rem);
    align-items: end;
}

.case-kicker,
.case-section-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-display-en);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.case-kicker {
    color: #ffad5c;
    margin-bottom: 1.25rem;
}

.case-kicker::before {
    content: '';
    width: 28px;
    height: 2px;
    background: currentColor;
}

.case-hero h1 {
    max-width: 850px;
    margin: 0;
    font-size: clamp(2.55rem, 6.4vw, 5.7rem);
    font-weight: 850;
    line-height: 1.02;
    letter-spacing: -0.055em;
    word-break: keep-all;
}

.case-hero h1 em {
    color: #ff9a33;
    font-style: normal;
}

.case-lead {
    max-width: 760px;
    margin: 1.65rem 0 0;
    color: rgba(255, 255, 255, 0.74);
    font-size: clamp(1.05rem, 1.6vw, 1.25rem);
    line-height: 1.78;
    word-break: keep-all;
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.7rem;
}

.case-tag {
    padding: 0.48rem 0.78rem;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    color: rgba(255, 255, 255, 0.76);
    background: rgba(255, 255, 255, 0.045);
    font-size: 0.78rem;
    font-weight: 600;
}

.case-hero-panel {
    position: relative;
    padding: 1.6rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 4px;
    background: rgba(10, 12, 16, 0.5);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(16px);
}

.case-number {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.48);
    font-family: var(--font-display-en);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.case-number strong {
    color: #ff9a33;
    font-size: 2.6rem;
    line-height: 1;
    letter-spacing: -0.06em;
}

.case-hero-facts {
    display: grid;
    gap: 0;
    margin: 0;
}

.case-hero-fact {
    display: grid;
    grid-template-columns: 88px 1fr;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.case-hero-fact:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.case-hero-fact dt {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.75rem;
    font-weight: 600;
}

.case-hero-fact dd {
    margin: 0;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.5;
}

.case-answer-band {
    position: relative;
    z-index: 2;
    margin-top: -1px;
    background: #ff8800;
    color: #19130d;
}

.case-answer-band .container {
    display: grid;
    grid-template-columns: minmax(220px, 0.55fr) minmax(0, 1.45fr);
    gap: clamp(2rem, 6vw, 5rem);
    padding-top: clamp(2.25rem, 4vw, 3.75rem);
    padding-bottom: clamp(2.25rem, 4vw, 3.75rem);
}

.case-answer-question {
    font-size: clamp(1.2rem, 2vw, 1.55rem);
    font-weight: 800;
    line-height: 1.35;
    word-break: keep-all;
}

.case-answer-question span {
    display: block;
    margin-bottom: 0.65rem;
    font-family: var(--font-display-en);
    font-size: 0.68rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    opacity: 0.62;
}

.case-answer-text {
    margin: 0;
    font-size: clamp(1.02rem, 1.6vw, 1.2rem);
    font-weight: 570;
    line-height: 1.75;
    word-break: keep-all;
}

.case-article {
    padding: clamp(4rem, 8vw, 7.5rem) 0;
}

.case-article-layout {
    display: grid;
    grid-template-columns: 210px minmax(0, 760px);
    justify-content: space-between;
    gap: clamp(3rem, 8vw, 7rem);
}

.case-toc {
    align-self: start;
    position: sticky;
    top: calc(var(--navbar-height) + 2rem);
    padding-top: 0.4rem;
}

.case-toc strong {
    display: block;
    margin-bottom: 1rem;
    font-family: var(--font-display-en);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.case-toc ol {
    display: grid;
    gap: 0.75rem;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: case-toc;
}

.case-toc li {
    counter-increment: case-toc;
}

.case-toc a {
    display: grid;
    grid-template-columns: 1.7rem 1fr;
    gap: 0.5rem;
    color: #67645f;
    font-size: 0.82rem;
    line-height: 1.45;
    text-decoration: none;
}

.case-toc a::before {
    content: '0' counter(case-toc);
    color: #ff7800;
    font-family: var(--font-display-en);
    font-size: 0.68rem;
    font-weight: 700;
}

.case-toc a:hover {
    color: #111319;
}

.case-content {
    min-width: 0;
}

.case-section {
    scroll-margin-top: calc(var(--navbar-height) + 2rem);
    padding-bottom: clamp(3.5rem, 7vw, 6rem);
    margin-bottom: clamp(3.5rem, 7vw, 6rem);
    border-bottom: 1px solid var(--case-line);
}

.case-section:last-child {
    margin-bottom: 0;
}

.case-section-kicker {
    margin-bottom: 1rem;
    color: #d96700;
}

.case-section h2 {
    max-width: 700px;
    margin: 0 0 1.5rem;
    font-size: clamp(1.8rem, 3.5vw, 3rem);
    font-weight: 820;
    letter-spacing: -0.045em;
    word-break: keep-all;
}

.case-section h3 {
    margin: 2rem 0 0.8rem;
    font-size: clamp(1.08rem, 1.7vw, 1.3rem);
    font-weight: 780;
}

.case-section p {
    margin: 0 0 1.15rem;
    color: #57544f;
    font-size: 1rem;
    line-height: 1.85;
    word-break: keep-all;
}

.case-section p strong {
    color: #1c1d21;
}

.case-fact-grid,
.case-scope-grid,
.case-fit-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.case-fact-card,
.case-scope-card,
.case-fit-card {
    padding: 1.5rem;
    border: 1px solid var(--case-line);
    background: rgba(255, 255, 255, 0.55);
}

.case-fact-card span,
.case-scope-card span {
    display: block;
    margin-bottom: 0.55rem;
    color: #d96700;
    font-family: var(--font-display-en);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.case-fact-card strong {
    display: block;
    font-size: 1.2rem;
    line-height: 1.35;
    word-break: keep-all;
}

.case-scope-card h3,
.case-fit-card h3 {
    margin: 0 0 0.65rem;
}

.case-scope-card p,
.case-fit-card p {
    margin: 0;
    font-size: 0.92rem;
    line-height: 1.7;
}

.case-timeline {
    display: grid;
    margin-top: 2rem;
    border-top: 1px solid var(--case-line);
}

.case-timeline-item {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--case-line);
}

.case-timeline-step {
    color: #d96700;
    font-family: var(--font-display-en);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.case-timeline-copy h3 {
    margin: 0 0 0.45rem;
}

.case-timeline-copy p {
    margin: 0;
    font-size: 0.94rem;
}

.case-media {
    margin-top: 2rem;
    overflow: hidden;
    border: 1px solid rgba(23, 25, 31, 0.18);
    background: #111319;
    box-shadow: 0 18px 45px rgba(20, 18, 14, 0.14);
}

.case-media-frame {
    position: relative;
    aspect-ratio: 16 / 9;
}

.case-media-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.case-media-caption {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    padding: 1rem 1.2rem;
    color: rgba(255, 255, 255, 0.66);
    font-size: 0.78rem;
}

.case-media-caption a {
    color: #ffad5c;
    font-weight: 700;
    text-decoration: none;
}

.case-media-caption a:hover {
    color: #fff;
}

.case-source-list,
.case-check-list {
    display: grid;
    gap: 0.75rem;
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
}

.case-source-list li,
.case-check-list li {
    position: relative;
    padding-left: 1.4rem;
    color: #57544f;
    line-height: 1.7;
}

.case-source-list li::before,
.case-check-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.68em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #ff7a00;
}

.case-source-list a {
    color: #242832;
    font-weight: 700;
    text-underline-offset: 3px;
}

.case-note {
    margin-top: 1.8rem;
    padding: 1.2rem 1.35rem;
    border-left: 3px solid #ff8800;
    background: rgba(255, 136, 0, 0.08);
    color: #494640;
    font-size: 0.9rem;
    line-height: 1.75;
}

.case-related {
    padding: clamp(4rem, 8vw, 7rem) 0;
    color: #fff;
    background: #17191f;
}

.case-related-header {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 2rem;
}

.case-related-header h2 {
    margin: 0.55rem 0 0;
    font-size: clamp(1.9rem, 4vw, 3.2rem);
}

.case-related-header > a {
    color: #ffad5c;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
}

.case-related-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.case-related-card {
    min-height: 245px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1.6rem;
    color: #fff;
    background:
        radial-gradient(circle at 100% 0, rgba(255, 136, 0, 0.14), transparent 38%),
        #1d2028;
    text-decoration: none;
    transition: background var(--duration-normal) var(--ease-default), transform var(--duration-normal) var(--ease-default);
}

.case-related-card:hover {
    position: relative;
    z-index: 1;
    background-color: #272b35;
    transform: translateY(-4px);
}

.case-related-card span {
    color: #ff9a33;
    font-family: var(--font-display-en);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.case-related-card h3 {
    margin: 1rem 0 auto;
    font-size: 1.3rem;
    line-height: 1.4;
    word-break: keep-all;
}

.case-related-card p {
    margin: 1.2rem 0 0;
    color: rgba(255, 255, 255, 0.58);
    font-size: 0.84rem;
    line-height: 1.6;
}

.case-cta {
    padding: clamp(4rem, 8vw, 7rem) 0;
    color: #15120f;
    background:
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.25), transparent 24%),
        linear-gradient(125deg, #ff9a33 0%, #ff7800 100%);
}

.case-cta-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2rem;
    align-items: center;
}

.case-cta h2 {
    margin: 0;
    font-size: clamp(2rem, 4.2vw, 3.8rem);
    font-weight: 850;
    letter-spacing: -0.05em;
    word-break: keep-all;
}

.case-cta p {
    max-width: 700px;
    margin: 0.9rem 0 0;
    font-size: 1rem;
    line-height: 1.7;
}

.case-cta-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.7rem;
}

.case-cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    min-height: 50px;
    padding: 0.85rem 1.2rem;
    border: 1px solid rgba(21, 18, 15, 0.32);
    color: #15120f;
    font-size: 0.9rem;
    font-weight: 800;
    text-decoration: none;
}

.case-cta-button--primary {
    border-color: #16181f;
    color: #fff;
    background: #16181f;
}

.case-cta-button:hover {
    transform: translateY(-2px);
}

[data-theme="dark"] .case-study-page {
    --case-ink: var(--text-primary);
    --case-paper: #121419;
    --case-line: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .case-section p,
[data-theme="dark"] .case-source-list li,
[data-theme="dark"] .case-check-list li,
[data-theme="dark"] .case-toc a {
    color: var(--dark-text-secondary);
}

[data-theme="dark"] .case-section p strong,
[data-theme="dark"] .case-source-list a,
[data-theme="dark"] .case-toc a:hover {
    color: var(--dark-text-primary);
}

[data-theme="dark"] .case-fact-card,
[data-theme="dark"] .case-scope-card,
[data-theme="dark"] .case-fit-card {
    background: rgba(255, 255, 255, 0.035);
}

[data-theme="dark"] .case-note {
    color: var(--dark-text-secondary);
    background: rgba(255, 136, 0, 0.1);
}

@media (max-width: 900px) {
    .case-hero-grid,
    .case-answer-band .container,
    .case-article-layout,
    .case-cta-inner {
        grid-template-columns: 1fr;
    }

    .case-hero-panel {
        max-width: 620px;
    }

    .case-toc {
        position: static;
        padding: 0 0 1.5rem;
        border-bottom: 1px solid var(--case-line);
    }

    .case-toc ol {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .case-cta-actions {
        justify-content: flex-start;
    }
}

@media (max-width: 680px) {
    .case-hero {
        padding-top: 3.8rem;
    }

    .case-hero::before {
        width: 90vw;
        right: -42%;
    }

    .case-hero h1 {
        font-size: clamp(2.25rem, 12vw, 3.4rem);
    }

    .case-answer-band .container {
        gap: 1.2rem;
    }

    .case-fact-grid,
    .case-scope-grid,
    .case-fit-grid,
    .case-related-grid,
    .case-toc ol {
        grid-template-columns: 1fr;
    }

    .case-timeline-item {
        grid-template-columns: 64px minmax(0, 1fr);
        gap: 1rem;
    }

    .case-related-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .case-related-card {
        min-height: 205px;
    }

    .case-cta-button {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .case-related-card,
    .case-cta-button {
        transition: none;
    }

    .case-related-card:hover,
    .case-cta-button:hover {
        transform: none;
    }
}