/* ===== Case Study Page Layout ===== */
.cs-hero {
    padding: 140px 32px 60px;
    position: relative;
    overflow: hidden;
}

.cs-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(52, 211, 153, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse 60% 80% at 85% 15%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

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

.cs-breadcrumb {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.cs-breadcrumb a {
    color: var(--accent);
}

.cs-breadcrumb span {
    margin: 0 8px;
    color: var(--text-secondary);
}

.cs-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-heading);
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 20px;
    max-width: 800px;
}

.cs-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    line-height: 1.6;
    margin-bottom: 32px;
}

.cs-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.cs-meta-tag {
    background: var(--accent-dim);
    color: var(--accent);
    padding: 6px 16px;
    border-radius: 100px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid var(--accent-border);
}

a.cs-meta-tag--link {
    text-decoration: none;
    transition: background 0.2s, border-color 0.2s;
}

a.cs-meta-tag--link:hover {
    background: rgba(52, 211, 153, 0.25);
    border-color: var(--accent);
}

/* Results banner */
.cs-results-banner {
    background: var(--bg-elevated);
    padding: 48px 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.cs-result-item {
    text-align: center;
}

.cs-result-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent) 0%, #6ee7b7 50%, rgba(99, 102, 241, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.cs-result-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Content sections */
.cs-content {
    padding: 64px 32px;
    max-width: 800px;
    margin: 0 auto;
}

.cs-section {
    margin-bottom: 56px;
}

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

.cs-section-label {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 12px;
}

.cs-section h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 20px;
}

.cs-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text);
    margin-bottom: 16px;
}

.cs-section ul {
    list-style: none;
    padding: 0;
}

.cs-section ul li {
    position: relative;
    padding-left: 22px;
    font-size: 1.05rem;
    color: var(--text);
    margin-bottom: 12px;
    line-height: 1.6;
}

.cs-section ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

/* Technology tags */
.cs-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.cs-tech-tag {
    background: var(--bg-card);
    color: var(--text);
    padding: 8px 18px;
    border-radius: 100px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===== Author Byline ===== */
.cs-author {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
}

.cs-author__avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 1.5px solid rgba(52, 211, 153, 0.25);
    flex-shrink: 0;
}

.cs-author__info {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    line-height: 1.4;
}

.cs-author__name {
    color: var(--text);
    font-weight: 600;
}

.cs-author__name a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}

.cs-author__name a:hover {
    color: var(--accent);
}

.cs-author__role {
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===== TL;DR Summary Block ===== */
.cs-tldr {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 32px 0;
}

.cs-tldr__box {
    background: var(--bg-elevated);
    border: 1px solid rgba(52, 211, 153, 0.15);
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 28px 32px;
}

.cs-tldr__heading {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--accent);
    margin-bottom: 12px;
}

.cs-tldr__text {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text);
    margin: 0;
}

/* ===== Publish / Updated Date ===== */
.cs-dates {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.cs-dates time {
    color: var(--text);
    font-weight: 500;
}

/* ===== Before / After Comparison Table ===== */
.cs-comparison {
    margin-top: 8px;
    margin-bottom: 16px;
    overflow-x: auto;
}

.cs-comparison table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.cs-comparison th,
.cs-comparison td {
    padding: 14px 20px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-comparison thead th {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.cs-comparison th:first-child {
    color: var(--text);
    font-family: var(--font-heading);
    font-weight: 600;
    width: 30%;
}

.cs-comparison .cs-col-before {
    color: var(--text-secondary);
}

.cs-comparison .cs-col-after {
    color: var(--accent);
    font-weight: 600;
}

.cs-comparison tbody tr:last-child td {
    border-bottom: none;
}

/* ===== FAQ Accordion ===== */
.cs-faq {
    margin-bottom: 56px;
}

.cs-faq details {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-faq details:last-of-type {
    border-bottom: none;
}

.cs-faq summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-heading);
    cursor: pointer;
    list-style: none;
    transition: color 0.2s;
}

.cs-faq summary::-webkit-details-marker {
    display: none;
}

.cs-faq summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 300;
    color: var(--accent);
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 16px;
}

.cs-faq details[open] summary::after {
    content: '−';
}

.cs-faq summary:hover {
    color: var(--accent);
}

.cs-faq .cs-faq__answer {
    padding: 0 0 20px;
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text);
}

.cs-faq .cs-faq__answer p {
    margin-bottom: 12px;
}

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

/* ===== Layout: Content + Sticky TOC ===== */
.cs-layout {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 56px;
    max-width: 1120px;
    margin: 0 auto;
    padding: 64px 32px;
    align-items: start;
}

.cs-layout .cs-content {
    padding: 0;
    max-width: none;
    margin: 0;
}

/* --- Table of Contents --- */
.cs-toc {
    position: sticky;
    top: 100px;
    align-self: start;
}

.cs-toc__heading {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.cs-toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
    border-left: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-toc li {
    margin: 0;
}

.cs-toc a {
    display: block;
    padding: 10px 0 10px 20px;
    font-family: var(--font-heading);
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: color 0.2s, border-color 0.2s;
    line-height: 1.4;
}

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

.cs-toc a.active {
    color: var(--accent);
    border-left-color: var(--accent);
}

/* TOC responsive */
@media (max-width: 960px) {
    .cs-layout {
        grid-template-columns: 1fr;
        gap: 0;
        padding: 0;
    }

    .cs-layout .cs-content {
        padding: 40px 24px;
    }

    .cs-toc {
        position: static;
        padding: 0 24px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .cs-toc ul {
        display: flex;
        flex-wrap: wrap;
        gap: 4px 0;
        border-left: none;
        padding-bottom: 16px;
    }

    .cs-toc a {
        padding: 6px 12px;
        border-left: none;
        margin-left: 0;
        font-size: 0.75rem;
        border-radius: 100px;
    }

    .cs-toc a.active {
        background: var(--accent-dim);
        border-left: none;
    }
}

@media (min-width: 961px) {
    .cs-content--has-toc {
        padding: 64px 32px;
        max-width: none;
    }
}

/* Back link */
.cs-back {
    padding: 40px 32px 80px;
    text-align: center;
}

.cs-back a {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    padding: 12px 32px;
    border: 1px solid var(--accent-border);
    border-radius: 100px;
    transition: background 0.2s;
}

.cs-back a:hover {
    background: var(--accent-dim);
}

/* Placeholder state */
.cs-placeholder {
    padding: 48px;
    text-align: center;
    background: var(--bg-card);
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
}

.cs-placeholder strong {
    display: block;
    color: var(--text-heading);
    font-size: 1.3rem;
    margin-bottom: 8px;
}

/* ===== Case Study Index — Bento Grid ===== */
.cs-index-grid {
    padding: 0 32px 80px;
}

.cs-bento {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: var(--max-width);
    margin: 0 auto;
}

/* --- Card base --- */
.cs-card {
    position: relative;
    display: flex;
    flex-direction: column;
    border-radius: 20px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    transition: border-color 0.4s, transform 0.3s, box-shadow 0.4s;
}

.cs-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
    color: inherit;
}

/* Featured card spans full row */
.cs-card--featured {
    grid-column: 1 / -1;
}

/* --- Decorative orbs --- */
.cs-card__orb {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.35;
    transition: opacity 0.5s, transform 0.5s;
}

.cs-card:hover .cs-card__orb {
    opacity: 0.55;
    transform: scale(1.15);
}

/* Emerald orbs (featured / default) */
[data-accent="emerald"] .cs-card__orb--1 {
    width: 300px; height: 300px;
    top: -80px; right: -60px;
    background: radial-gradient(circle, rgba(52, 211, 153, 0.6), transparent 70%);
}
[data-accent="emerald"] .cs-card__orb--2 {
    width: 200px; height: 200px;
    bottom: -40px; left: 10%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent 70%);
}

/* Indigo orbs */
[data-accent="indigo"] .cs-card__orb--1 {
    width: 240px; height: 240px;
    top: -60px; right: -40px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.55), transparent 70%);
}
[data-accent="indigo"] .cs-card__orb--2 {
    width: 180px; height: 180px;
    bottom: -30px; left: -20px;
    background: radial-gradient(circle, rgba(52, 211, 153, 0.3), transparent 70%);
}

/* Amber orbs */
[data-accent="amber"] .cs-card__orb--1 {
    width: 240px; height: 240px;
    top: -60px; left: -40px;
    background: radial-gradient(circle, rgba(251, 191, 36, 0.45), transparent 70%);
}
[data-accent="amber"] .cs-card__orb--2 {
    width: 180px; height: 180px;
    bottom: -30px; right: -20px;
    background: radial-gradient(circle, rgba(251, 146, 60, 0.3), transparent 70%);
}

/* Hover border glow per accent */
[data-accent="emerald"]:hover { border-color: rgba(52, 211, 153, 0.3); }
[data-accent="indigo"]:hover  { border-color: rgba(99, 102, 241, 0.3); }
[data-accent="amber"]:hover   { border-color: rgba(251, 191, 36, 0.3); }

/* --- Card content --- */
.cs-card__content {
    position: relative;
    z-index: 1;
    padding: 40px 44px 24px;
    flex: 1;
}

.cs-card--featured .cs-card__content {
    padding: 48px 52px 28px;
}

/* Eyebrow row (featured only) */
.cs-card__eyebrow {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.cs-card__label {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--accent);
    background: rgba(52, 211, 153, 0.12);
    padding: 5px 14px;
    border-radius: 100px;
    border: 1px solid rgba(52, 211, 153, 0.2);
}

/* Tags */
.cs-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.cs-card__eyebrow .cs-card__tags {
    margin-bottom: 0;
}

.cs-tag {
    background: var(--accent-dim);
    color: var(--accent);
    padding: 5px 14px;
    border-radius: 100px;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid var(--accent-border);
}

.cs-tag--indigo {
    background: rgba(99, 102, 241, 0.12);
    color: #a5b4fc;
    border-color: rgba(99, 102, 241, 0.25);
}

.cs-tag--amber {
    background: rgba(251, 191, 36, 0.1);
    color: #fcd34d;
    border-color: rgba(251, 191, 36, 0.25);
}

/* Hero stat */
.cs-card__hero-stat {
    font-family: var(--font-heading);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--accent) 0%, #6ee7b7 50%, rgba(99, 102, 241, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cs-card--featured .cs-card__hero-stat {
    font-size: 4.5rem;
    margin-bottom: 20px;
}

.cs-card--half .cs-card__hero-stat {
    font-size: 3rem;
}

.cs-card__hero-stat--indigo {
    background: linear-gradient(135deg, #818cf8 0%, #a5b4fc 50%, #c4b5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cs-card__hero-stat--amber {
    background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 50%, #fcd34d 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Title & description */
.cs-card__title {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 12px;
}

.cs-card--featured .cs-card__title { font-size: 1.75rem; }
.cs-card--half .cs-card__title    { font-size: 1.35rem; }

.cs-card__desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
}

.cs-card--featured .cs-card__desc {
    font-size: 1.1rem;
    max-width: 720px;
}

/* Metrics row */
.cs-card__metrics {
    display: flex;
    gap: 32px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

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

.cs-metric__value {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--accent);
}

.cs-metric__value--indigo { color: #a5b4fc; }
.cs-metric__value--amber  { color: #fbbf24; }

.cs-metric__label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 500;
}

/* CTA */
.cs-card__cta {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 18px 44px 28px;
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent);
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.3s, transform 0.3s;
}

.cs-card--featured .cs-card__cta { padding: 18px 52px 32px; }

.cs-card__cta--indigo { color: #a5b4fc; }
.cs-card__cta--amber  { color: #fbbf24; }

.cs-card:hover .cs-card__cta {
    opacity: 1;
    transform: translateY(0);
}

.cs-card__cta svg {
    transition: transform 0.25s;
}

.cs-card:hover .cs-card__cta svg {
    transform: translateX(4px);
}

/* ===== Staggered entrance animation ===== */
.cs-card {
    animation: cardReveal 0.6s ease-out both;
}

.cs-card:nth-child(1) { animation-delay: 0.1s; }
.cs-card:nth-child(2) { animation-delay: 0.25s; }
.cs-card:nth-child(3) { animation-delay: 0.4s; }

@keyframes cardReveal {
    from {
        opacity: 0;
        transform: translateY(32px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .cs-title {
        font-size: 2rem;
    }

    .cs-hero {
        padding: 100px 24px 40px;
    }

    .cs-content {
        padding: 40px 24px;
    }

    .cs-results-banner {
        padding: 32px 24px;
    }

    .cs-result-number {
        font-size: 1.6rem;
    }

    .cs-tldr {
        padding: 24px 24px 0;
    }

    .cs-tldr__box {
        padding: 20px 24px;
    }

    .cs-dates {
        flex-direction: column;
        gap: 6px;
    }

    .cs-comparison th,
    .cs-comparison td {
        padding: 10px 14px;
        font-size: 0.88rem;
    }

    .cs-faq summary {
        font-size: 1rem;
    }

    .cs-index-grid {
        padding: 0 16px 48px;
    }

    .cs-bento {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .cs-card__content,
    .cs-card--featured .cs-card__content {
        padding: 28px 24px 16px;
    }

    .cs-card__cta,
    .cs-card--featured .cs-card__cta {
        padding: 12px 24px 24px;
        opacity: 1;
        transform: none;
    }

    .cs-card--featured .cs-card__hero-stat {
        font-size: 3rem;
    }

    .cs-card--half .cs-card__hero-stat {
        font-size: 2.4rem;
    }

    .cs-card--featured .cs-card__title {
        font-size: 1.4rem;
    }

    .cs-card__eyebrow {
        flex-direction: column;
        gap: 10px;
    }

    .cs-card__metrics {
        flex-wrap: wrap;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .cs-card--featured .cs-card__hero-stat {
        font-size: 2.4rem;
        letter-spacing: -1px;
    }

    .cs-card--half .cs-card__hero-stat {
        font-size: 2rem;
    }
}