/* ============================================
   Case Study — matches home page style
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #ffffff;
    --text: #111111;
    --muted: #666666;
    --border: #e8e8e8;
    --alt-bg: #f9f9f7;
    --font: 'Instrument Sans', -apple-system, sans-serif;
    --font-display: 'Lora', Georgia, serif;
}

html { scroll-behavior: auto; }

body {
    opacity: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============ NAV ============ */
.cs-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.cs-nav-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cs-back {
    font-size: 13px;
    color: var(--muted);
    text-decoration: none;
    transition: color 150ms;
}

.cs-back:hover { color: var(--text); }

.cs-nav-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
}

.cs-nav-link {
    font-size: 13px;
    color: var(--muted);
    text-decoration: none;
    transition: color 150ms;
}

.cs-nav-link:hover { color: var(--text); }

.cs-nav-next {
    font-size: 13px;
    color: var(--muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: color 150ms;
}

.cs-nav-next:hover { color: var(--text); }

/* ============ HERO ============ */
.cs-hero {
    padding-top: 56px;
    border-bottom: 1px solid var(--border);
}

.cs-hero-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 5rem 2rem 3.5rem;
}

.cs-hero-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.cs-tag {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
}

.cs-year {
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.05em;
}

.cs-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 1.5rem;
}

.cs-subtitle {
    font-size: 18px;
    color: var(--muted);
    line-height: 1.7;
    max-width: 680px;
    margin-bottom: 3rem;
}

.cs-details {
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.cs-detail {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.cs-detail-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
}

.cs-detail-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
}

.cs-hero-image {
    width: 100%;
    border-top: 1px solid var(--border);
    overflow: hidden;
}

.cs-hero-image img {
    width: 100%;
    height: 920px;
    object-fit: cover;
    object-position: top;
    display: block;
}

/* ============ SECTIONS ============ */
.cs-main {}

.cs-section {
    border-bottom: 1px solid var(--border);
}

.cs-section--alt {
    background: var(--alt-bg);
}

.cs-section-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 5rem 2rem;
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 4rem;
    align-items: start;
}

.cs-section-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    padding-top: 0.35rem;
    position: sticky;
    top: 72px;
}

.cs-section-body {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

/* ============ TYPOGRAPHY ============ */
.cs-lead {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text);
    letter-spacing: -0.01em;
}

.cs-body {
    font-size: 16px;
    color: var(--muted);
    line-height: 1.8;
}

/* ============ METRICS ============ */
.cs-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

.cs-metric {
    background: var(--bg);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.cs-section--alt .cs-metric {
    background: var(--alt-bg);
}

.cs-metric-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1;
}

.cs-metric-label {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.4;
}

/* ============ QUOTE ============ */
.cs-quote {
    border-left: 2px solid var(--text);
    padding: 0.5rem 0 0.5rem 1.5rem;
    margin: 0;
}

.cs-quote p {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--text);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.cs-quote cite {
    font-size: 13px;
    color: var(--muted);
    font-style: normal;
}

/* ============ TWO COL CARDS ============ */
.cs-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

.cs-card {
    background: var(--bg);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.cs-section--alt .cs-card {
    background: var(--alt-bg);
}

.cs-card-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
}

.cs-card p {
    font-size: 16px;
    color: var(--muted);
    line-height: 1.7;
}

/* ============ STEPS ============ */
.cs-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--border);
}

.cs-step {
    display: flex;
    gap: 1.5rem;
    padding: 1.75rem;
    border-bottom: 1px solid var(--border);
    align-items: start;
}

.cs-step:last-child { border-bottom: none; }

.cs-step-num {
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.05em;
    padding-top: 0.2rem;
    flex-shrink: 0;
    width: 24px;
}

.cs-step-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.cs-step p {
    font-size: 16px;
    color: var(--muted);
    line-height: 1.7;
}

/* ============ CALLOUT ============ */
.cs-callout {
    background: var(--bg);
    border: 1px solid var(--border);
    border-left: 2px solid var(--text);
    padding: 1.5rem;
}

.cs-section--alt .cs-callout {
    background: var(--alt-bg);
}

.cs-callout p {
    font-size: 15px;
    color: var(--text);
    line-height: 1.7;
}

.cs-callout em {
    font-style: italic;
}

.cs-section--fullbleed {
    padding: 0;
}

.cs-section--fullbleed .cs-section-inner {
    max-width: 100%;
    padding: 0;
    display: block;
}

.cs-section--fullbleed .cs-section-inner--constrained {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 2rem;
}
.cs-img-placeholder {
    width: 100%;
    background: var(--alt-bg);
    border: 1px dashed #ccc;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: #bbb;
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.cs-img-placeholder--full {
    height: 480px;
}

.cs-img-placeholder--half {
    height: 320px;
}

.cs-img-placeholder-icon {
    font-size: 1.5rem;
    opacity: 0.4;
}

.cs-img-placeholder-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

/* ============ IMAGE GRID ============ */
.cs-image-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

.cs-image-item {
    display: flex;
    flex-direction: column;
    background: var(--bg);
}

.cs-image-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.cs-image-caption {
    font-size: 12px;
    color: var(--muted);
    padding: 0.75rem;
    border-top: 1px solid var(--border);
}

/* ============ OUTCOMES ============ */
.cs-outcomes {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--border);
}

.cs-outcome {
    padding: 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.cs-outcome:last-child { border-bottom: none; }

.cs-outcome-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    flex-wrap: wrap;
}

.cs-outcome-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
}

.cs-outcome-number {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text);
    letter-spacing: -0.02em;
}

.cs-outcome p {
    font-size: 16px;
    color: var(--muted);
    line-height: 1.7;
}

.cs-outcome-split {
    display: flex;
    gap: 2rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.cs-outcome-split > div {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.cs-outcome-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.cs-outcome-val {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text);
}

/* ============ NEXT ============ */
.cs-next-section {
    background: var(--bg);
}

.cs-next {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    text-decoration: none;
    color: inherit;
    padding: 2rem;
    border: 1px solid var(--border);
    margin-top: 1.5rem;
    transition: background 150ms;
}

.cs-next:hover { background: #fafafa; }

.cs-next .cs-tag { display: block; margin-bottom: 0.5rem; }

.cs-next-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text);
    margin-bottom: 0.35rem;
    letter-spacing: -0.01em;
}

.cs-next-desc {
    font-size: 16px;
    color: var(--muted);
}

.cs-next-arrow {
    font-size: 1.5rem;
    color: var(--muted);
    flex-shrink: 0;
    transition: transform 150ms;
}

.cs-next:hover .cs-next-arrow { transform: translateX(4px); }

/* ============ DEMO GIF ============ */
.demo-gif-wrap {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: stretch;
    overflow: hidden;
    background: rgba(245, 243, 237, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* Cover the baked-in left edge line in the gif */
.demo-gif-wrap .demo-gif-edge {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    transform: translateX(calc(-640px));
    background: #e8e8e8;
    z-index: 2;
    pointer-events: none;
}

.demo-gif-wrap::before,
.demo-gif-wrap::after {
    content: '';
    flex: 1;
    background: linear-gradient(135deg,
        rgba(200, 210, 240, 0.35),
        rgba(220, 215, 245, 0.25),
        rgba(200, 225, 245, 0.3)
    );
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.3);
}

.demo-gif {
    display: block;
    width: 100%;
    max-width: 1280px;
    flex-shrink: 0;
    height: auto;
    transform: scale(1.008) translateX(1px);
    overflow: hidden;
}

/* ============ FOOTER ============ */
.cs-footer {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    font-size: 12px;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
}

.cs-footer a {
    color: var(--muted);
    text-decoration: none;
    transition: color 150ms;
}

.cs-footer a:hover { color: var(--text); }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
    .cs-section-inner {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 3rem 1.5rem;
    }

    .cs-section-label {
        position: static;
    }

    .cs-hero-inner { padding: 3rem 1.5rem 2.5rem; }
    .cs-hero-image img { height: 280px; }
    .cs-details { gap: 1.5rem; }
    .cs-metrics { grid-template-columns: 1fr; }
    .cs-two-col { grid-template-columns: 1fr; }
    .cs-image-grid { grid-template-columns: 1fr; }
    .cs-outcome-header { flex-direction: column; gap: 0.25rem; }
    .cs-nav-title { display: none; }
    .cs-footer { padding: 1.5rem; }
}

/* ============ PASSWORD GATE ============ */
#pw-gate {
    position: fixed;
    inset: 0;
    background: #fff;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pw-box {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 340px;
    padding: 2rem;
}

.pw-label {
    font-size: 14px;
    color: var(--muted);
}

.pw-row {
    display: flex;
    gap: 0.5rem;
}

.pw-row input {
    font-family: var(--font);
    font-size: 15px;
    padding: 0.65rem 0.9rem;
    border: 1px solid var(--border);
    outline: none;
    flex: 1;
    color: var(--text);
    transition: border-color 150ms;
}

.pw-row input:focus { border-color: var(--text); }

.pw-row button {
    font-family: var(--font);
    font-size: 13px;
    font-weight: 500;
    padding: 0.65rem 1.25rem;
    background: var(--text);
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background 150ms;
    white-space: nowrap;
}

.pw-row button:hover { background: #333; }

.pw-error {
    font-size: 12px;
    color: #c0392b;
    min-height: 1em;
}

/* ============ DARK THEME ============ */
body.dark {
    --bg: #1c1a24;
    --text: #f0f0f0;
    --muted: #9a95a8;
    --border: #2e2a38;
    --alt-bg: #211f29;
}

body.dark .cs-nav {
    background: #1c1a24;
}

body.dark .cs-next:hover {
    background: #23202c;
}

body.dark #pw-gate {
    background: #1c1a24;
}

body.dark .pw-row input {
    background: #211f29;
}

body.dark .demo-gif-wrap {
    background: rgba(20, 20, 20, 0.6);
}

body.dark .demo-gif-wrap::before,
body.dark .demo-gif-wrap::after {
    background: linear-gradient(135deg,
        rgba(40, 45, 70, 0.4),
        rgba(50, 45, 70, 0.3),
        rgba(40, 55, 70, 0.35)
    );
    border-color: rgba(255,255,255,0.06);
}

body.dark .demo-gif-wrap .demo-gif-edge {
    background: #2a2a2a;
}

/* ============ CASE STUDY THEME TOGGLE ============ */
.cs-theme-toggle {
    background: var(--text);
    color: var(--bg);
    border: none;
    font-family: var(--font);
    font-size: 12px;
    padding: 0.5rem 1.2rem;
    cursor: pointer;
    letter-spacing: 0.04em;
    transition: transform 150ms, opacity 150ms;
    border-radius: 20px;
    flex-shrink: 0;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.cs-theme-toggle:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

/* ============ MASONRY GALLERY ============ */
.cs-masonry {
    columns: 3;
    column-gap: 1rem;
    padding: 2rem;
}

@media (max-width: 1000px) {
    .cs-masonry {
        columns: 2;
    }
}

@media (max-width: 600px) {
    .cs-masonry {
        columns: 1;
    }
}

/* ============ EXPANDABLE IMAGES ============ */
.expandable-img {
    transition: transform 400ms ease, box-shadow 400ms ease;
    cursor: pointer;
}
.expandable-img:hover {
    transform: scale(1.02) translateY(-4px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.18);
}