/* ==========================================================================
   ZETA PROJECTS — Grid listing page
   ========================================================================== */

.zeta-page-header {
    text-align: center;
    padding: 4.5rem 1.5rem 3rem;
    max-width: var(--zeta-max-width);
    margin: 0 auto;
}

.zeta-page-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--zeta-primary);
    background: var(--zeta-primary-soft);
    border: 1px solid var(--zeta-border);
    padding: 0.4rem 1rem;
    border-radius: var(--zeta-radius-full);
    margin-bottom: 1.5rem;
}

.zeta-page-title {
    font-size: clamp(2rem, 4.5vw, 3.2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--zeta-text);
    margin-bottom: 1rem;
}

.zeta-page-subtitle {
    color: var(--zeta-text-soft);
    font-size: 1.1rem;
    max-width: 42rem;
    margin: 0 auto;
    line-height: 1.7;
}

/* ===== Filter Bar ===== */
.zeta-filter-bar {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin: 2.5rem auto 0;
    max-width: var(--zeta-max-width);
    padding: 0 1.5rem;
}

.zeta-filter-chip {
    padding: 0.5rem 1.1rem;
    border-radius: var(--zeta-radius-full);
    border: 1.5px solid var(--zeta-border);
    background: var(--zeta-bg-elevated);
    color: var(--zeta-text-soft);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--zeta-transition);
    cursor: pointer;
}

.zeta-filter-chip:hover {
    border-color: var(--zeta-primary);
    color: var(--zeta-primary);
}

.zeta-filter-chip.zeta-active {
    background: var(--zeta-primary);
    border-color: var(--zeta-primary);
    color: #fff;
}

/* ===== Projects Grid ===== */
.zeta-projects-section {
    padding: 3rem 1.5rem 6rem;
}

.zeta-projects-grid {
    max-width: var(--zeta-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.zeta-project-card {
    background: var(--zeta-bg-elevated);
    border: 1px solid var(--zeta-border);
    border-radius: var(--zeta-radius-lg);
    overflow: hidden;
    transition: var(--zeta-transition-slow);
    display: flex;
    flex-direction: column;
}

.zeta-project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--zeta-shadow-lg);
    border-color: var(--zeta-primary);
}

.zeta-project-media {
    position: relative;
    width: 100%;
    height: 13rem;
    overflow: hidden;
    background: var(--zeta-surface);
}

.zeta-project-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--zeta-ease);
}

.zeta-project-card:hover .zeta-project-media img {
    transform: scale(1.08);
}

.zeta-project-media-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--zeta-text-muted);
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--zeta-surface), var(--zeta-bg-soft));
}

.zeta-project-badge {
    position: absolute;
    top: 0.9rem;
    left: 0.9rem;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(6px);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.3rem 0.7rem;
    border-radius: var(--zeta-radius-full);
}

.zeta-project-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.zeta-project-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--zeta-text);
    margin-bottom: 0.6rem;
    letter-spacing: -0.01em;
}

.zeta-project-desc {
    color: var(--zeta-text-soft);
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 1.25rem;
    flex: 1;
}

.zeta-project-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--zeta-border);
}

.zeta-project-link {
    color: var(--zeta-primary);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--zeta-transition);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.zeta-project-link:hover {
    color: var(--zeta-primary-hover);
    gap: 0.5rem;
}

.zeta-project-link-external {
    color: var(--zeta-text-muted);
}

.zeta-project-link-external:hover {
    color: var(--zeta-accent);
}

/* ===== Empty State ===== */
.zeta-empty-state {
    text-align: center;
    padding: 5rem 1.5rem;
    color: var(--zeta-text-muted);
}

.zeta-empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ===== Back Button Zone ===== */
.zeta-page-footer-nav {
    text-align: center;
    margin-top: 4rem;
}

@media (max-width: 960px) {
    .zeta-projects-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .zeta-projects-grid { grid-template-columns: 1fr; }
}