/* ========== PAGE HERO ========== */
.cs-hero {
    position: relative;
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

.cs-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(135deg, rgba(176,184,196,0.13) 1px, transparent 1px),
        linear-gradient(45deg,  rgba(176,184,196,0.13) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}

body.dark .cs-hero::before {
    background-image:
        linear-gradient(135deg, rgba(120,136,158,0.08) 1px, transparent 1px),
        linear-gradient(45deg,  rgba(120,136,158,0.08) 1px, transparent 1px);
}

.cs-hero::after {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,87,179,0.07) 0%, transparent 65%);
    pointer-events: none;
}

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

.cs-hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 20px;
}

.cs-hero-eyebrow::before {
    content: '';
    display: inline-block;
    width: 28px;
    height: 2px;
    background: var(--accent);
    flex-shrink: 0;
}

.cs-hero h1 {
    font-size: clamp(2.4rem, 4.5vw, 3.8rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 20px;
    max-width: 680px;
}

.cs-hero p {
    font-size: 1rem;
    font-weight: 300;
    line-height: 1.85;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0;
}

.cs-hero-watermark {
    position: absolute;
    bottom: -40px;
    right: 0;
    font-size: clamp(5rem, 12vw, 9rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-primary);
    opacity: 0.025;
    white-space: nowrap;
    pointer-events: none;
    user-select: none;
}

/* ========== FILTER BAR ========== */
.cs-filter-bar {
    padding: 32px 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 72px;
    z-index: 50;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

body:not(.dark) .cs-filter-bar {
    background: rgba(255,255,255,0.92);
}
body.dark .cs-filter-bar {
    background: rgba(18,20,28,0.92);
}

.cs-filter-inner {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.cs-filter-label {
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-right: 6px;
    flex-shrink: 0;
}

.cs-filter-btn {
    padding: 7px 18px;
    border-radius: 40px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-family: 'Poppins', sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    white-space: nowrap;
}

.cs-filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.cs-filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

/* ========== CASE STUDIES GRID ========== */
.cs-section {
    padding: 72px 0 100px;
    background: var(--bg-secondary);
}

.cs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 28px;
    margin-top: 0;
}

/* ========== CASE STUDY CARD ========== */
.cs-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
    position: relative;
    display: flex;
    flex-direction: column;
}

.cs-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 52px rgba(0,0,0,0.12);
    border-color: var(--accent);
}

body.dark .cs-card:hover {
    box-shadow: 0 20px 52px rgba(0,0,0,0.45);
}

/* top accent bar */
.cs-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.28s ease;
    border-radius: 12px 12px 0 0;
}

.cs-card:hover::before {
    opacity: 1;
}

.cs-card-header {
    padding: 28px 28px 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.cs-card-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(0,87,179,0.08);
    border: 1px solid rgba(0,87,179,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s;
}

body.dark .cs-card-icon {
    background: rgba(75,159,255,0.1);
    border-color: rgba(75,159,255,0.2);
}

.cs-card:hover .cs-card-icon {
    background: rgba(0,87,179,0.14);
}

.cs-card-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--accent);
}

.cs-card-meta {
    flex: 1;
}

.cs-card-tag {
    display: inline-block;
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    background: rgba(0,87,179,0.07);
    border-radius: 4px;
    padding: 3px 8px;
    margin-bottom: 8px;
}

body.dark .cs-card-tag {
    background: rgba(75,159,255,0.1);
}

.cs-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--text-primary);
    margin: 0;
    transition: color 0.2s;
}

.cs-card:hover .cs-card-title {
    color: var(--accent);
}

.cs-card-body {
    padding: 0 28px 20px;
    flex: 1;
}

.cs-card-desc {
    font-size: 0.9rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--text-secondary);
    margin: 0;
    max-width: 100%;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* stats row */
.cs-card-stats {
    display: flex;
    gap: 0;
    margin: 20px 0 0;
    border-top: 1px solid var(--border);
    padding-top: 18px;
}

.cs-stat {
    flex: 1;
    text-align: center;
    padding: 0 8px;
    border-right: 1px solid var(--border);
}

.cs-stat:last-child {
    border-right: none;
}

.cs-stat-value {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.cs-stat-label {
    display: block;
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 3px;
}

.cs-card-footer {
    padding: 16px 28px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cs-card-client {
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.cs-card-client::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 1px;
    background: var(--accent);
}

.cs-read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
    text-decoration: none;
    transition: gap 0.2s;
}

.cs-read-more svg {
    width: 13px;
    height: 13px;
    stroke: var(--accent);
    transition: transform 0.2s;
}

.cs-card:hover .cs-read-more {
    gap: 10px;
}

.cs-card:hover .cs-read-more svg {
    transform: translateX(2px);
}

/* hidden filter state */
.cs-card.cs-hidden {
    display: none;
}

/* ========== MODAL OVERLAY ========== */
.cs-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 9000;
    background: rgba(8, 12, 22, 0.72);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.cs-modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.cs-modal {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 16px;
    width: 100%;
    max-width: 780px;
    max-height: 88vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(24px) scale(0.97);
    transition: transform 0.32s ease, opacity 0.32s ease;
    opacity: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) var(--bg-secondary);
}

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

/* modal top accent */
.cs-modal::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--accent), var(--accent-hover));
    border-radius: 16px 16px 0 0;
}

.cs-modal-close {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    justify-content: flex-end;
    padding: 18px 22px 0;
    background: var(--bg-primary);
}

.cs-modal-close-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
    flex-shrink: 0;
}

.cs-modal-close-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

.cs-modal-close-btn svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
}

.cs-modal-content {
    padding: 12px 44px 48px;
}

@media (max-width: 600px) {
    .cs-modal-content { padding: 12px 24px 36px; }
}

.cs-modal-tag {
    display: inline-block;
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    background: rgba(0,87,179,0.07);
    border-radius: 4px;
    padding: 4px 10px;
    margin-bottom: 16px;
}

body.dark .cs-modal-tag {
    background: rgba(75,159,255,0.1);
}

.cs-modal-title {
    font-size: clamp(1.5rem, 3vw, 2.1rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.cs-modal-client {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-weight: 300;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 28px;
}

.cs-modal-client::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 2px;
    background: var(--accent);
    flex-shrink: 0;
}

/* modal stats */
.cs-modal-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 36px;
}

.cs-modal-stat {
    background: var(--bg-secondary);
    padding: 20px 16px;
    text-align: center;
}

.cs-modal-stat-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.02em;
    line-height: 1;
    margin-bottom: 6px;
}

.cs-modal-stat-label {
    display: block;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* section headings inside modal */
.cs-modal-section {
    margin-bottom: 28px;
}

.cs-modal-section-title {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cs-modal-section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.cs-modal-section p {
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 1.85;
    color: var(--text-secondary);
    margin: 0 0 12px 0;
    max-width: 100%;
}

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

/* bullet list inside modal */
.cs-modal-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 0;
    padding: 0;
}

.cs-modal-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.92rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-secondary);
}

.cs-modal-list li::before {
    content: '◈';
    color: var(--accent);
    font-size: 0.65rem;
    flex-shrink: 0;
    margin-top: 5px;
}

/* divider */
.cs-modal-divider {
    height: 1px;
    background: var(--border);
    margin: 28px 0;
}

/* outcome highlight box */
.cs-outcome-box {
    background: rgba(0,87,179,0.05);
    border: 1px solid rgba(0,87,179,0.15);
    border-left: 4px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 20px 24px;
    margin-top: 16px;
}

body.dark .cs-outcome-box {
    background: rgba(75,159,255,0.06);
    border-color: rgba(75,159,255,0.15);
    border-left-color: var(--accent);
}

.cs-outcome-box p {
    font-size: 0.92rem;
    font-weight: 400;
    font-style: italic;
    line-height: 1.75;
    color: var(--text-primary);
    margin: 0;
    max-width: 100%;
}

/* ========== EMPTY STATE ========== */
.cs-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 72px 24px;
    display: none;
}

.cs-empty.visible {
    display: block;
}

.cs-empty p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 auto;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 860px) {
    .cs-grid {
        grid-template-columns: 1fr;
    }
    .cs-hero {
        padding: 120px 0 60px;
    }
}

@media (max-width: 600px) {
    .cs-modal-stats {
        grid-template-columns: 1fr;
    }
    .cs-filter-bar {
        top: 68px;
    }
    .cs-card-stats {
        gap: 0;
    }
}