/* ===========================
   Portfolio Page Styles
   =========================== */

/* Active nav */
.nav-links a.active {
    color: var(--gold) !important;
}

/* Portfolio Hero */
.pf-hero {
    padding: calc(var(--nav-height) + 80px) 0 72px;
    background: var(--off-white);
    border-bottom: 1px solid var(--warm-gray);
}

.pf-hero-content {
    max-width: 560px;
}

.pf-hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 6vw, 5.5rem);
    font-weight: 300;
    color: var(--charcoal);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 20px;
}

.pf-hero-desc {
    font-size: 15px;
    font-weight: 300;
    color: #6a6560;
    line-height: 1.9;
}

/* Filter */
.pf-filter {
    padding: 32px 0;
    background: var(--white);
    border-bottom: 1px solid var(--warm-gray);
    position: sticky;
    top: var(--nav-height);
    z-index: 50;
}

.filter-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    background: none;
    border: 1px solid var(--warm-gray);
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--mid-gray);
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--forest);
    color: var(--white);
    border-color: var(--forest);
}

/* Grid */
.pf-grid-section {
    padding: 64px 0 120px;
    background: var(--white);
}

.pf-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
}

.pf-item {
    cursor: pointer;
    overflow: hidden;
    background: var(--charcoal);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.pf-item.hidden {
    display: none;
}

.pf-visual {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: #1a1512;
}

.pf-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94), filter 0.5s ease;
    filter: brightness(0.85) saturate(0.88);
}

.pf-item:hover .pf-visual img {
    transform: scale(1.07);
    filter: brightness(0.72) saturate(1.0);
}

.pf-item.pf-large {
    grid-column: span 2;
}

.pf-item.pf-large .pf-visual {
    aspect-ratio: 16/9;
}

.pf-item.pf-tall .pf-visual {
    aspect-ratio: 3/4;
}

.pf-visual-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.pf-visual-placeholder span {
    font-family: var(--font-sans);
    font-size: 13px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(250, 250, 248, 0.4);
}

.pf-visual-placeholder em {
    font-family: var(--font-sans);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(250, 250, 248, 0.18);
    font-style: normal;
}

/* Overlay */
.pf-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 9, 8, 0);
    display: flex;
    align-items: flex-end;
    padding: 24px;
    transition: background 0.4s ease;
}

.pf-item:hover .pf-overlay {
    background: rgba(10, 9, 8, 0.6);
}

.pf-overlay-content {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.pf-item:hover .pf-overlay-content {
    opacity: 1;
    transform: translateY(0);
}

.pf-overlay-tag {
    display: block;
    font-family: var(--font-sans);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 6px;
}

.pf-overlay-content h3 {
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.04em;
    color: var(--white);
}

/* Info */
.pf-info {
    padding: 20px 24px 28px;
    background: var(--charcoal);
    border-top: 1px solid rgba(250,250,248,0.06);
}

.pf-tag {
    display: block;
    font-family: var(--font-sans);
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 6px;
}

.pf-info h2 {
    font-family: var(--font-kr);
    font-size: 15px;
    font-weight: 500;
    color: var(--white);
    margin-bottom: 4px;
    line-height: 1.4;
}

.pf-info p {
    font-size: 12px;
    font-weight: 300;
    color: rgba(250, 250, 248, 0.4);
    line-height: 1.6;
}

/* Case Banner */
.pf-case-banner {
    padding: 100px 0;
    background: var(--off-white);
    border-top: 1px solid var(--warm-gray);
}

.case-banner-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.case-banner-text p {
    font-size: 15px;
    font-weight: 300;
    color: #6a6560;
    line-height: 1.9;
    margin-top: 20px;
    max-width: 480px;
}

/* === Responsive Portfolio === */
@media (max-width: 1100px) {
    .pf-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pf-item.pf-large {
        grid-column: span 2;
    }
}

@media (max-width: 700px) {
    .pf-grid {
        grid-template-columns: 1fr;
    }

    .pf-item.pf-large {
        grid-column: span 1;
    }

    .pf-item.pf-large .pf-visual {
        aspect-ratio: 4/3;
    }

    .pf-item.pf-tall .pf-visual {
        aspect-ratio: 4/3;
    }

    .case-banner-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}