/* =========================================================
   PROJECT CASE STUDY SYSTEM
   Scoped to .case-study-page so it can live beside the
   existing portfolio/theme CSS without changing other pages.
   ========================================================= */

.case-study-page {
    --cs-blue: #3aa8db;
    --cs-navy: #31485e;
    --cs-gold: #caa669;
    --cs-ink: #25282b;
    --cs-body: #5f656a;
    --cs-muted: #7a8085;
    --cs-line: #e5e8eb;
    --cs-soft: #f6f8f9;
    --cs-white: #ffffff;
}

.case-study-page .case-study {
    padding: 64px 0 90px;
}

.case-study-page .case-study-shell {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 28px;
}

.case-study-page .case-study-reading {
    max-width: 820px;
}

/* ---------- Top navigation ---------- */

.case-study-page .case-study-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-bottom: 28px;
    margin-bottom: 48px;
    border-bottom: 1px solid var(--cs-line);
}

.case-study-page .case-study-back,
.case-study-page .case-study-home {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .02em;
}

.case-study-page .case-study-back:before {
    content: "←";
    margin-right: 8px;
}

/* ---------- Hero ---------- */

.case-study-page .case-study-kicker {
    display: inline-block;
    margin-bottom: 16px;
    color: var(--cs-blue);
    font-size: 12px;
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: .11em;
    text-transform: uppercase;
}

.case-study-page .case-study-title {
    max-width: 970px;
    margin: 0 0 20px;
    color: var(--cs-ink);
    font-size: clamp(42px, 6vw, 72px);
    line-height: 1.02;
    font-weight: 700;
    letter-spacing: -.035em;
}

.case-study-page .case-study-deck {
    max-width: 900px;
    margin: 0 0 34px;
    color: #4f555a;
    font-size: clamp(20px, 2.5vw, 28px);
    line-height: 1.42;
    font-weight: 300;
}

.case-study-page .case-study-hero {
    margin: 42px 0 46px;
}

.case-study-page .case-study-hero img,
.case-study-page .case-study-media img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
}

.case-study-page .case-study-hero-placeholder,
.case-study-page .case-study-visual-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 420px;
    padding: 40px;
    background: var(--cs-soft);
    border: 1px dashed #cfd5d9;
    border-radius: 4px;
    color: var(--cs-muted);
    text-align: center;
}

/* ---------- Facts rail ---------- */

.case-study-page .case-study-facts {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin: 0 0 76px;
    padding: 24px 0;
    border-top: 1px solid var(--cs-line);
    border-bottom: 1px solid var(--cs-line);
}

.case-study-page .case-study-fact {
    min-width: 0;
    padding: 0 22px;
    border-left: 1px solid var(--cs-line);
}

.case-study-page .case-study-fact:first-child {
    padding-left: 0;
    border-left: 0;
}

.case-study-page .case-study-fact:last-child {
    padding-right: 0;
}

.case-study-page .case-study-fact-label {
    display: block;
    margin-bottom: 7px;
    color: var(--cs-muted);
    font-size: 10px;
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.case-study-page .case-study-fact-value {
    display: block;
    color: var(--cs-ink);
    font-size: 14px;
    line-height: 1.45;
    font-weight: 500;
}

/* ---------- Sections ---------- */

.case-study-page .case-study-section {
    margin: 0 0 82px;
}

.case-study-page .case-study-section-label {
    display: block;
    margin-bottom: 12px;
    color: var(--cs-gold);
    font-size: 11px;
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
}

.case-study-page .case-study-section h2 {
    margin: 0 0 22px;
    color: var(--cs-ink);
    font-size: clamp(29px, 4vw, 42px);
    line-height: 1.12;
    font-weight: 600;
    letter-spacing: -.02em;
}

.case-study-page .case-study-section h3 {
    margin: 38px 0 14px;
    color: var(--cs-ink);
    font-size: 22px;
    line-height: 1.3;
    font-weight: 600;
}

.case-study-page .case-study-section p,
.case-study-page .case-study-section li {
    color: var(--cs-body);
    font-size: 17px;
    line-height: 1.75;
    font-weight: 400;
}

.case-study-page .case-study-section p {
    max-width: 76ch;
    margin: 0 0 20px;
}

.case-study-page .case-study-section strong {
    color: #41464a;
    font-weight: 600;
}

.case-study-page .case-study-section ul,
.case-study-page .case-study-section ol {
    max-width: 76ch;
    margin: 20px 0 24px;
    padding-left: 24px;
}

.case-study-page .case-study-section li {
    margin-bottom: 10px;
}

/* ---------- Role / contribution callout ---------- */

.case-study-page .case-study-role {
    position: relative;
    max-width: 900px;
    margin: 30px 0 0;
    padding: 28px 32px 28px 34px;
    background: var(--cs-soft);
    border-left: 4px solid var(--cs-blue);
}

.case-study-page .case-study-role h3 {
    margin: 0 0 10px;
    font-size: 18px;
}

.case-study-page .case-study-role p {
    margin: 0;
    font-size: 15px;
    line-height: 1.65;
}

/* ---------- Research question ---------- */

.case-study-page .case-study-question {
    max-width: 940px;
    margin: 34px 0;
    padding: 32px 0 32px 28px;
    border-left: 3px solid var(--cs-gold);
    color: var(--cs-navy);
    font-size: clamp(23px, 3vw, 31px);
    line-height: 1.45;
    font-weight: 400;
}

/* ---------- Methods / metrics ---------- */

.case-study-page .case-study-method-grid,
.case-study-page .case-study-findings-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 30px;
}

.case-study-page .case-study-method,
.case-study-page .case-study-finding {
    padding: 22px;
    background: var(--cs-soft);
    border: 1px solid var(--cs-line);
    border-radius: 4px;
}

.case-study-page .case-study-method strong,
.case-study-page .case-study-finding strong {
    display: block;
    margin-bottom: 6px;
    color: var(--cs-ink);
    font-size: 15px;
    line-height: 1.35;
}

.case-study-page .case-study-method span,
.case-study-page .case-study-finding span {
    display: block;
    color: var(--cs-body);
    font-size: 14px;
    line-height: 1.55;
}

.case-study-page .case-study-stat {
    display: block;
    margin-bottom: 5px;
    color: var(--cs-blue);
    font-size: 34px;
    line-height: 1;
    font-weight: 700;
}

/* ---------- Figures / video ---------- */

.case-study-page .case-study-media {
    margin: 36px 0 54px;
}

.case-study-page .case-study-media-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin: 36px 0 54px;
}

.case-study-page .case-study-media figcaption,
.case-study-page .case-study-hero figcaption {
    margin-top: 12px;
    color: var(--cs-muted);
    font-size: 13px;
    line-height: 1.55;
}

.case-study-page .case-study-video {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
    background: #000;
    border-radius: 4px;
}

.case-study-page .case-study-video iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ---------- Findings emphasis ---------- */

.case-study-page .case-study-evidence {
    max-width: 920px;
    margin: 34px 0;
    padding: 30px 32px;
    background: #f2f7fa;
    border: 1px solid #d8e8f0;
    border-radius: 4px;
}

.case-study-page .case-study-evidence p {
    margin: 0;
    color: var(--cs-navy);
    font-size: 20px;
    line-height: 1.6;
}

/* ---------- Related scholarship ---------- */

.case-study-page .case-study-publications {
    margin: 24px 0 0;
    padding: 0;
    list-style: none;
}

.case-study-page .case-study-publications li {
    padding: 17px 0;
    margin: 0;
    border-top: 1px solid var(--cs-line);
}

.case-study-page .case-study-publications li:last-child {
    border-bottom: 1px solid var(--cs-line);
}

.case-study-page .case-study-publications a {
    font-weight: 500;
}

.case-study-page .case-study-publication-type {
    display: block;
    margin-bottom: 4px;
    color: var(--cs-muted);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
}

/* ---------- Team ---------- */

.case-study-page .case-study-team {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
    max-width: 900px;
}

.case-study-page .case-study-team h3 {
    margin-top: 0;
}

.case-study-page .case-study-team p {
    font-size: 15px;
}

/* ---------- Footer navigation ---------- */

.case-study-page .case-study-footer-nav {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 88px;
    padding-top: 30px;
    border-top: 1px solid var(--cs-line);
}

.case-study-page .case-study-footer-nav a {
    font-weight: 600;
}

/* ---------- Existing vertical header integration ---------- */

@media (min-width: 992px) {
    .case-study-page.header-vertical .case-study {
        margin-left: 250px;
    }
}

/* ---------- Tablet ---------- */

@media (max-width: 991px) {
    .case-study-page .case-study {
        padding-top: 40px;
    }

    .case-study-page .case-study-facts {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .case-study-page .case-study-fact {
        padding: 18px 20px;
        border-left: 0;
        border-top: 1px solid var(--cs-line);
    }

    .case-study-page .case-study-fact:nth-child(-n+2) {
        border-top: 0;
    }

    .case-study-page .case-study-fact:nth-child(odd) {
        padding-left: 0;
        border-right: 1px solid var(--cs-line);
    }

    .case-study-page .case-study-method-grid,
    .case-study-page .case-study-findings-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ---------- Mobile ---------- */

@media (max-width: 767px) {
    .case-study-page .case-study-shell {
        padding: 0 20px;
    }

    .case-study-page .case-study-topbar {
        margin-bottom: 34px;
    }

    .case-study-page .case-study-title {
        font-size: 42px;
    }

    .case-study-page .case-study-deck {
        font-size: 20px;
    }

    .case-study-page .case-study-facts,
    .case-study-page .case-study-method-grid,
    .case-study-page .case-study-findings-grid,
    .case-study-page .case-study-media-grid,
    .case-study-page .case-study-team {
        grid-template-columns: 1fr;
    }

    .case-study-page .case-study-fact,
    .case-study-page .case-study-fact:nth-child(odd) {
        padding: 16px 0;
        border-right: 0;
        border-top: 1px solid var(--cs-line);
    }

    .case-study-page .case-study-fact:first-child {
        border-top: 0;
    }

    .case-study-page .case-study-section {
        margin-bottom: 62px;
    }

    .case-study-page .case-study-section p,
    .case-study-page .case-study-section li {
        font-size: 16px;
    }

    .case-study-page .case-study-role,
    .case-study-page .case-study-evidence {
        padding: 24px;
    }

    .case-study-page .case-study-question {
        padding-left: 20px;
        font-size: 22px;
    }
}