/* ============================================================
   CASE STUDY PAGE
   ============================================================ */

/* ── Hero ── */
.cs-hero {
    padding: 180px 40px 60px;
    position: relative;
    z-index: 2;
}

.cs-hero-meta {
    display: flex;
    gap: 10px;
    margin-bottom: 28px;
}

.cs-badge {
    font-size: .72rem;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 100px;
    border: 1px solid var(--bdr);
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: .06em;
}

.cs-badge-industry {
    border-color: rgba(94,234,212,.2);
    color: var(--teal);
    background: rgba(94,234,212,.06);
}

.cs-hero-h1 {
    font-family: var(--disp);
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -.02em;
    max-width: 800px;
}

.cs-hero-sub {
    font-size: 1.05rem;
    color: var(--white);
    line-height: 1.7;
    max-width: 600px;
    margin-top: 20px;
}

/* ── Stats Bar ── */
.cs-stats {
    position: relative;
    z-index: 2;
    padding: 0 40px 64px;
}

.cs-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--bdr);
    border: 1px solid var(--bdr);
    border-radius: 16px;
    overflow: hidden;
}

.cs-stat {
    padding: 32px 24px;
    background: var(--bg2);
    text-align: center;
    transition: background .3s;
}

.cs-stat:hover {
    background: rgba(255,255,255,.025);
}

.cs-stat-val {
    display: block;
    font-family: var(--disp);
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -.02em;
    background: linear-gradient(135deg, var(--teal), var(--violet));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: 8px;
}

.cs-stat-label {
    display: block;
    font-size: .75rem;
    color: var(--muted);
    font-weight: 500;
}

/* ── Body Layout ── */
.cs-body {
    position: relative;
    z-index: 2;
    padding: 0 0 100px;
}

.cs-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 64px;
    align-items: start;
}

/* ── Sidebar ── */
.cs-sidebar {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.cs-sidebar-block {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.cs-sidebar-label {
    font-size: .65rem;
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: .08em;
}

.cs-sidebar-val {
    font-size: .88rem;
    font-weight: 500;
    line-height: 1.4;
}

.cs-sidebar-nav {
    padding-top: 20px;
    border-top: 1px solid var(--bdr);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cs-toc-link {
    font-size: .82rem;
    color: var(--muted);
    padding: 4px 0 4px 12px;
    border-left: 2px solid transparent;
    transition: all .25s;
}

.cs-toc-link:hover {
    color: var(--white);
}

.cs-toc-link.active {
    color: var(--teal);
    border-left-color: var(--teal);
}

/* Sticky sidebar CTA */
.cs-sidebar-cta {
    margin-top: 20px;
    display: inline-flex; align-items: center; justify-content: center;
    gap: 8px;
    padding: 14px 18px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(94,234,212,.12), rgba(167,139,250,.10));
    border: 1px solid rgba(94,234,212,.32);
    color: #fff;
    font-family: var(--disp);
    font-size: .82rem; font-weight: 600;
    letter-spacing: -.01em;
    text-align: center;
    transition: all .25s ease;
}
.cs-sidebar-cta:hover {
    border-color: rgba(94,234,212,.6);
    background: linear-gradient(135deg, rgba(94,234,212,.18), rgba(167,139,250,.14));
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(94,234,212,.14);
}
.cs-sidebar-cta svg { transition: transform .25s ease; }
.cs-sidebar-cta:hover svg { transform: translateX(3px); }

/* Before / After comparison block */
.cs-ba-section { padding-top: 48px; }
.cs-ba {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
    gap: 18px;
}
.cs-ba-col {
    padding: 26px 24px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,.08);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    position: relative; overflow: hidden;
}
.cs-ba-before {
    background: linear-gradient(135deg, rgba(255,90,90,.05), rgba(255,255,255,.012));
    border-color: rgba(255,120,120,.18);
}
.cs-ba-before::after {
    content:''; position:absolute; top:0; left:0; width:3px; height:100%;
    background: linear-gradient(180deg, rgba(255,120,120,.5), rgba(255,120,120,.05));
}
.cs-ba-after {
    background: linear-gradient(135deg, rgba(94,234,212,.06), rgba(167,139,250,.03));
    border-color: rgba(94,234,212,.28);
}
.cs-ba-after::after {
    content:''; position:absolute; top:0; right:0; width:3px; height:100%;
    background: linear-gradient(180deg, var(--teal), rgba(94,234,212,.05));
}
.cs-ba-label {
    display: inline-block;
    font-family: var(--disp);
    font-size: .68rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: .12em;
    padding: 5px 11px; border-radius: 6px;
    margin-bottom: 16px;
}
.cs-ba-before .cs-ba-label {
    color: #FF9B9B;
    background: rgba(255,155,155,.08);
    border: 1px solid rgba(255,155,155,.22);
}
.cs-ba-after .cs-ba-label {
    color: var(--teal);
    background: rgba(94,234,212,.08);
    border: 1px solid rgba(94,234,212,.28);
}
.cs-ba ul {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 10px;
}
.cs-ba li {
    font-size: .92rem; color: var(--white); opacity: .88;
    padding-left: 22px; position: relative;
    line-height: 1.5;
}
.cs-ba-before li::before {
    content: '×'; position: absolute; left: 4px; top: -1px;
    color: #FF9B9B; font-weight: 700; font-size: 1rem;
}
.cs-ba-after li::before {
    content: '✓'; position: absolute; left: 0; top: 0;
    color: var(--teal); font-weight: 700; font-size: .9rem;
}
.cs-ba-arrow {
    display: flex; align-items: center; justify-content: center;
    color: var(--teal); opacity: .55;
    padding: 0 4px;
    animation: compareArrowPulse 2.4s ease-in-out infinite;
}

@media (max-width: 768px) {
    .cs-ba { grid-template-columns: 1fr; gap: 14px; }
    .cs-ba-arrow { transform: rotate(90deg); padding: 4px 0; }
}

/* ── Content ── */
.cs-content {
    max-width: 720px;
}

.cs-intro {
    margin-bottom: 56px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.cs-intro.visible {
    opacity: 1;
    transform: translateY(0);
}

.cs-intro p {
    font-size: 1.05rem;
    color: var(--white);
    line-height: 1.8;
    margin-bottom: 16px;
}

.cs-intro p:last-child {
    margin-bottom: 0;
}

/* ── Sections ── */
.cs-section {
    margin-bottom: 64px;
    padding-top: 24px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.cs-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.cs-section-label {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
}

.cs-section-num {
    font-family: var(--disp);
    font-size: .75rem;
    font-weight: 700;
    color: var(--teal);
    letter-spacing: .05em;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid rgba(94,234,212,.2);
    background: rgba(94,234,212,.06);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cs-section-label h2 {
    font-family: var(--disp);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -.02em;
}

.cs-section > p {
    font-size: .95rem;
    color: var(--white);
    line-height: 1.7;
    margin-bottom: 24px;
}

.cs-section > p strong {
    color: var(--white);
}

/* ── Problem/Research Points ── */
.cs-point {
    padding: 20px 24px;
    border: 1px solid var(--bdr);
    border-radius: 12px;
    background: var(--surf);
    margin-bottom: 12px;
    transition: border-color .3s;
}

.cs-point:hover {
    border-color: rgba(94,234,212,.15);
}

.cs-point h3 {
    font-family: var(--disp);
    font-size: .95rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.cs-point p {
    font-size: .88rem;
    color: var(--white);
    line-height: 1.6;
}

/* ── Solution Cards ── */
.cs-solution-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.cs-solution-card {
    padding: 28px 24px;
    border: 1px solid var(--bdr);
    border-radius: 14px;
    background: var(--surf);
    transition: all .4s var(--ease);
    opacity: 0;
    transform: translateY(20px);
}

.cs-solution-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.cs-solution-card:nth-child(2) { transition-delay: .08s }
.cs-solution-card:nth-child(3) { transition-delay: .16s }
.cs-solution-card:nth-child(4) { transition-delay: .24s }

.cs-solution-card:hover {
    border-color: rgba(94,234,212,.2);
    transform: translateY(-2px);
    box-shadow: 0 16px 48px rgba(0,0,0,.2);
}

.cs-sol-icon {
    width: 44px;
    height: 44px;
    border-radius: 11px;
    border: 1px solid rgba(94,234,212,.15);
    background: rgba(94,234,212,.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--teal);
    margin-bottom: 16px;
}

.cs-solution-card h4 {
    font-family: var(--disp);
    font-size: .95rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.cs-solution-card p {
    font-size: .85rem;
    color: var(--white);
    line-height: 1.6;
}

/* ── Results with animated bars ── */
.cs-results-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cs-result {
    position: relative;
    padding: 24px 28px;
    border: 1px solid var(--bdr);
    border-radius: 14px;
    background: var(--surf);
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.cs-result.visible {
    opacity: 1;
    transform: translateY(0);
}

.cs-result:nth-child(2) { transition-delay: .1s }
.cs-result:nth-child(3) { transition-delay: .2s }
.cs-result:nth-child(4) { transition-delay: .3s }

.cs-result-bar {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 0;
    background: linear-gradient(90deg, rgba(94,234,212,.06), rgba(167,139,250,.04));
    border-right: 2px solid rgba(94,234,212,.2);
    transition: width 1.2s cubic-bezier(.16,1,.3,1);
}

.cs-result.bar-visible .cs-result-bar {
    width: var(--width);
}

.cs-result-content {
    position: relative;
    z-index: 1;
}

.cs-result-content h3 {
    font-family: var(--disp);
    font-size: .95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.cs-result-content p {
    font-size: .85rem;
    color: var(--white);
    line-height: 1.6;
}

/* ── Testimonial ── */
.cs-testimonial-section {
    margin-bottom: 0;
}

.cs-testimonial {
    padding: 40px 36px;
    border: 1px solid var(--bdr);
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(94,234,212,.03), rgba(167,139,250,.03));
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.cs-testimonial.visible {
    opacity: 1;
    transform: translateY(0);
}

.cs-testimonial::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 10%;
    right: 10%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--teal), var(--violet), transparent);
    opacity: .4;
}

.cs-quote-mark {
    color: rgba(94,234,212,.12);
    margin-bottom: 20px;
    display: block;
}

.cs-testimonial blockquote {
    margin-bottom: 28px;
}

.cs-testimonial blockquote p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--white);
    margin-bottom: 12px;
}

.cs-testimonial blockquote p:last-child {
    margin-bottom: 0;
    color: var(--white);
    font-weight: 500;
}

.cs-testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.cs-author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--teal), var(--violet));
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--disp);
    font-size: .85rem;
    font-weight: 700;
    color: var(--bg);
}

.cs-testimonial-author strong {
    display: block;
    font-family: var(--disp);
    font-size: .95rem;
    font-weight: 600;
}

.cs-testimonial-author span {
    display: block;
    font-size: .78rem;
    color: var(--muted);
}

/* ── CTA ── */
.cs-cta {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 100px 40px 120px;
    border-top: 1px solid var(--bdr);
}

.cs-cta h2 {
    font-family: var(--disp);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -.03em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.cs-cta p {
    font-size: 1rem;
    color: var(--white);
    margin-bottom: 32px;
}

.cs-cta .hero-cta {
    margin: 0 auto;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
    .cs-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .cs-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
        padding: 24px;
        border: 1px solid var(--bdr);
        border-radius: 16px;
        background: var(--surf);
    }

    .cs-sidebar-nav {
        grid-column: 1 / -1;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 12px;
        border-top: 1px solid var(--bdr);
        padding-top: 16px;
    }

    .cs-toc-link {
        border-left: none;
        padding: 6px 14px;
        border: 1px solid var(--bdr);
        border-radius: 100px;
        font-size: .75rem;
    }

    .cs-toc-link.active {
        border-color: var(--teal);
        background: rgba(94,234,212,.06);
    }

    .cs-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cs-solution-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .cs-hero {
        padding: 140px 20px 40px;
    }

    .cs-stats {
        padding: 0 20px 48px;
    }

    .cs-sidebar {
        grid-template-columns: 1fr 1fr;
    }

    .cs-cta {
        padding: 60px 20px 80px;
    }
}