/* =============================================
   Case Study / Referenz Section
   Design: Dark premium card with gold accents
   ============================================= */

.case-study-section {
    background: var(--card-bg);
    position: relative;
    overflow: hidden;
}

/* Subtle top-border glow */
.case-study-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 10%;
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    opacity: 0.4;
}

/* ---- Label / Eyebrow ---- */
.cs-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-secondary);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 16px;
}
.cs-eyebrow i {
    font-size: 0.75rem;
}

.case-study-section h2 {
    text-align: center;
    margin-bottom: 20px;
}

.cs-subtitle {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.7;
}

/* ---- Main Case Study Card ---- */
.cs-card {
    background: linear-gradient(145deg, #0d1f3c 0%, #0a1931 50%, #0e2145 100%);
    border: 1px solid #1e293b;
    border-radius: 16px;
    padding: 0;
    overflow: hidden;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
    position: relative;
}

/* Accent line top of card */
.cs-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), #ffdf8e, var(--accent-color));
}

/* ---- Card Header / Context ---- */
.cs-card-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.cs-context {
    padding: 48px 40px;
    border-right: 1px solid #1e293b;
}

.cs-solution {
    padding: 48px 40px;
    background: rgba(255, 201, 71, 0.02);
}

.cs-label {
    font-family: var(--font-secondary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: #64748b;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.cs-label i {
    color: var(--accent-color);
    font-size: 0.7rem;
}

.cs-context h3,
.cs-solution h3 {
    font-size: 1.25rem;
    color: var(--headline-color);
    margin-bottom: 14px;
    line-height: 1.4;
}

.cs-context p,
.cs-solution p {
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.7;
}

.cs-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.cs-tag {
    display: inline-block;
    font-family: var(--font-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 5px 12px;
    background: rgba(255, 201, 71, 0.08);
    border: 1px solid rgba(255, 201, 71, 0.15);
    border-radius: 20px;
    color: var(--accent-color);
    letter-spacing: 0.3px;
}

/* ---- KPI Metrics Row ---- */
.cs-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid #1e293b;
    border-bottom: 1px solid #1e293b;
}

.cs-metric {
    padding: 36px 32px;
    text-align: center;
    position: relative;
    transition: background 0.3s ease;
}

.cs-metric:not(:last-child) {
    border-right: 1px solid #1e293b;
}

.cs-metric:hover {
    background: rgba(255, 201, 71, 0.03);
}

.cs-metric-value {
    font-family: var(--font-secondary);
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: 8px;
    display: block;
    /* Counter animation via JS */
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.cs-metric.in-view .cs-metric-value {
    opacity: 1;
    transform: translateY(0);
}

.cs-metric:nth-child(2) .cs-metric-value {
    transition-delay: 0.15s;
}
.cs-metric:nth-child(3) .cs-metric-value {
    transition-delay: 0.3s;
}

.cs-metric-label {
    font-size: 0.88rem;
    color: var(--text-color);
    line-height: 1.4;
    max-width: 200px;
    margin: 0 auto;
}

/* ---- Quote Block ---- */
.cs-quote-block {
    padding: 40px 48px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
    position: relative;
}

.cs-quote-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 201, 71, 0.15), rgba(255, 201, 71, 0.05));
    border-radius: 12px;
    color: var(--accent-color);
    font-size: 1.4rem;
}

.cs-quote-content {
    flex: 1;
}

.cs-quote-text {
    font-size: 1.15rem;
    font-style: italic;
    color: var(--headline-color);
    line-height: 1.7;
    margin-bottom: 14px;
    position: relative;
}

.cs-quote-author {
    font-family: var(--font-secondary);
    font-size: 0.85rem;
    color: #64748b;
}

.cs-quote-author strong {
    color: var(--accent-color);
}

/* ---- Bottom CTA bar ---- */
.cs-cta-bar {
    padding: 28px 48px;
    border-top: 1px solid #1e293b;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 25, 49, 0.5);
}

.cs-cta-text {
    font-size: 0.95rem;
    color: var(--text-color);
}

.cs-cta-text strong {
    color: var(--headline-color);
}

.cs-cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-color);
    color: var(--primary-color);
    font-weight: 700;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.95rem;
    border: 2px solid var(--accent-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    white-space: nowrap;
}

.cs-cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(255, 201, 71, 0.4);
}

.cs-cta-button i {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.cs-cta-button:hover i {
    transform: translateX(3px);
}

/* ---- Duration Badge ---- */
.cs-duration {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    padding: 6px 14px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 6px;
    font-family: var(--font-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    color: #22c55e;
}

.cs-duration i {
    font-size: 0.75rem;
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 900px) {
    .cs-card-header {
        grid-template-columns: 1fr;
    }

    .cs-context {
        border-right: none;
        border-bottom: 1px solid #1e293b;
        padding: 32px 24px;
    }

    .cs-solution {
        padding: 32px 24px;
    }

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

    .cs-metric:not(:last-child) {
        border-right: none;
        border-bottom: 1px solid #1e293b;
    }

    .cs-metric {
        padding: 28px 24px;
    }

    .cs-metric-value {
        font-size: 2.2rem;
    }

    .cs-quote-block {
        padding: 28px 24px;
        flex-direction: column;
        gap: 16px;
    }

    .cs-cta-bar {
        padding: 24px;
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .cs-cta-button {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .cs-metric-value {
        font-size: 1.8rem;
    }

    .cs-quote-text {
        font-size: 1rem;
    }

    .cs-context h3,
    .cs-solution h3 {
        font-size: 1.1rem;
    }
}