.project-box .live-github .case-study-btn {
    position: relative;
    display: inline-flex;
    padding: 1.3rem;
    font-size: 3rem;
    color: var(--white-color);
    border-radius: 50%;
    background: var(--second-bg-color);
    border: none;
    cursor: pointer;
    font-family: inherit;
    margin-left: 1.5rem;
    transition: 0.5s;
}

.project-box .live-github .case-study-btn:hover {
    color: var(--main-color);
}

.project-box .live-github .case-study-btn span {
    position: absolute;
    top: -60%;
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    font-size: 1.6rem;
    white-space: nowrap;
    padding: 0.5rem 1rem;
    border-radius: 0.6rem;
    pointer-events: none;
    background: var(--white-color);
    color: var(--bg-color);
    opacity: 0;
    transition: 0.2s;
}

.project-box .live-github .case-study-btn:hover span {
    top: -70%;
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

@media screen and (max-width: 480px) {
    .project-box .live-github {
        flex-wrap: wrap;
        row-gap: 1.5rem;
    }
}


/* =====================================================
   CASE STUDY MODAL (Problem -> Approach -> Challenges -> Result)
   ===================================================== */
.cs-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.82);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 100000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    padding: 2rem;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.cs-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.cs-modal {
    width: 80rem;
    max-width: 100%;
    max-height: 85vh;
    background: #0d0d0d;
    border: 0.1rem solid rgba(255, 140, 0, 0.35);
    border-radius: 2.4rem;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.95), 0 0 0 0.1rem rgba(255, 140, 0, 0.08) inset;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: scale(0.94) translateY(1.5rem);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* top accent line */
.cs-modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 0.2rem;
    opacity: 0.7;
    z-index: 1;
}

.cs-modal-overlay.active .cs-modal {
    transform: scale(1) translateY(0);
}

.cs-modal-close {
    position: absolute;
    top: 1.6rem;
    right: 1.6rem;
    width: 3.6rem;
    height: 3.6rem;
    border-radius: 50%;
    background: rgba(255, 95, 86, 0.12);
    color: #ff5f56;
    border: 0.1rem solid rgba(255, 95, 86, 0.3);
    font-size: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 5;
    transition: all 0.3s ease;
}

.cs-modal-close:hover {
    background: #ff5f56;
    color: #fff;
    transform: rotate(90deg);
}

.cs-modal-content {
    padding: 4.5rem 4rem 3rem;
    overflow-y: auto;
}

.cs-modal-content::-webkit-scrollbar {
    width: 0.6rem;
}

.cs-modal-content::-webkit-scrollbar-track {
    background: #111;
}

.cs-modal-content::-webkit-scrollbar-thumb {
    background: var(--main-color);
    border-radius: 1rem;
}

.cs-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.6rem;
}

.cs-header h2 {
    font-size: 3.2rem;
    color: var(--white-color);
}

.cs-status-badge {
    font-size: 1.2rem;
    font-weight: 600;
    padding: 0.4rem 1.2rem;
    border-radius: 2rem;
    letter-spacing: 0.05rem;
    text-transform: uppercase;
    background: rgba(39, 201, 63, 0.1);
    color: #27c93f;
    border: 0.1rem solid rgba(39, 201, 63, 0.3);
}

/* under-development badge variant */
.cs-status-badge.under-dev {
    background: rgba(255, 140, 0, 0.1);
    color: var(--main-color);
    border-color: rgba(255, 140, 0, 0.3);
}

.cs-tagline {
    font-size: 1.5rem;
    color: #666;
    margin: 1rem 0 2.5rem;
    line-height: 1.6;
}

.cs-tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 0.1rem solid rgba(255, 255, 255, 0.06);
}

.cs-tech-stack span {
    background: rgba(255, 255, 255, 0.04);
    color: var(--main-color);
    padding: 0.5rem 1.4rem;
    border-radius: 2rem;
    font-size: 1.3rem;
    font-family: 'Consolas', monospace;
    border: 0.1rem solid rgba(255, 140, 0, 0.2);
}

/* ---- Project stats bar (complexity / scale) ---- */
.cs-stats {
    display: flex;
    gap: 1.2rem;
    margin-bottom: 2.8rem;
    padding-bottom: 2.5rem;
    border-bottom: 0.1rem solid rgba(255, 255, 255, 0.06);
    flex-wrap: wrap;
}

.cs-stat-item {
    flex: 1;
    min-width: 12rem;
    background: #111;
    border: 0.1rem solid rgba(255, 255, 255, 0.07);
    border-radius: 1.2rem;
    padding: 1.4rem 1.6rem;
}

.cs-stat-label {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    color: #555;
    margin-bottom: 1rem;
}

.cs-stat-bar-track {
    width: 100%;
    height: 0.5rem;
    background: rgba(255, 255, 255, 0.07);
    border-radius: 10rem;
    overflow: hidden;
}

.cs-stat-bar-fill {
    height: 100%;
    border-radius: 10rem;
    background: var(--main-color);
    transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.cs-stat-value {
    font-size: 1.2rem;
    color: var(--main-color);
    margin-top: 0.7rem;
    font-weight: 600;
}

/* ---- Content blocks ---- */
.cs-block {
    margin-bottom: 1.6rem;
    background: #111;
    border: 0.1rem solid rgba(255, 255, 255, 0.06);
    border-radius: 1.4rem;
    padding: 2rem 2.4rem;
    transition: border-color 0.25s ease;
}

.cs-block:hover {
    border-color: rgba(255, 140, 0, 0.2);
}

.cs-block-label {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    color: var(--main-color);
    margin-bottom: 1rem;
}

.cs-block-label i {
    font-size: 2.2rem;
}

.cs-block p {
    font-size: 1.55rem;
    line-height: 1.8;
    color: #999;
}

.cs-block:last-of-type {
    margin-bottom: 0.5rem;
}

/* Modal Responsive */
@media screen and (max-width: 768px) {
    .cs-modal {
        max-height: 90vh;
        border-radius: 1.8rem;
    }

    .cs-modal-content {
        padding: 5.5rem 2.2rem 2.5rem;
    }

    .cs-header h2 {
        font-size: 2.6rem;
    }

    .cs-block p {
        font-size: 1.45rem;
    }
}

@media screen and (max-width: 480px) {
    .cs-modal-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .cs-modal {
        width: 100%;
        max-height: 92vh;
        border-radius: 2rem 2rem 0 0;
    }
}