/* =============================================
   Portfolio Page — Digitly.cz
   ============================================= */

/* --- Page Header --- */
.page-header {
  background: var(--bg);
  padding: 160px 56px 60px;
  text-align: center;
}

.page-header-inner {
  max-width: 600px;
  margin: 0 auto;
}

.page-label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.page-title {
  font-size: clamp(2.5rem, 4.5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 16px;
}

.page-desc {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- Filter --- */
.portfolio-filter {
  padding: 24px 56px;
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 72px;
  z-index: 50;
}

.filter-btn {
  padding: 8px 20px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s;
}

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

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

/* --- Portfolio Grid --- */
.portfolio-grid-section {
  padding: 48px 56px 100px;
  background: var(--bg);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
}

/* --- Portfolio Card --- */
.portfolio-card {
  transition: opacity 0.4s, transform 0.4s;
}

.portfolio-card.hidden {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
  position: absolute;
  visibility: hidden;
}

.portfolio-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.portfolio-card:hover {
  transform: translateY(-4px);
}

/* Reuse device-mockup from styles.css */
.portfolio-card .device-screen {
  height: 300px;
}

.portfolio-info {
  padding: 20px 4px;
}

.portfolio-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.portfolio-tag {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 2px 10px;
  border: 1px solid var(--accent-light);
  border-radius: 100px;
}

.portfolio-year {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-left: auto;
}

.portfolio-name {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 6px;
  transition: color 0.25s;
}

.portfolio-card:hover .portfolio-name {
  color: var(--accent);
}

.portfolio-desc {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- CTA Strip --- */
.cta-strip {
  background: var(--text);
  padding: 72px 56px;
}

.cta-strip-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
}

.cta-strip-title {
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
  font-weight: 600;
  color: var(--white);
}

.cta-strip-btn {
  background: var(--accent);
  white-space: nowrap;
}

.cta-strip-btn:hover {
  background: var(--white);
  color: var(--text);
}

/* --- Active nav link --- */
.nav-links a.active {
  color: var(--text);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .page-header { padding: 140px 32px 48px; }
  .portfolio-filter { padding: 20px 32px; }
  .portfolio-grid-section { padding: 32px 32px 80px; }
  .portfolio-grid { gap: 28px; }
  .cta-strip { padding: 56px 32px; }
}

@media (max-width: 768px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
  }

  .portfolio-card .device-screen {
    height: 240px;
  }

  .cta-strip-inner {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .page-header { padding: 120px 20px 40px; }

  .portfolio-filter {
    top: 56px;
    padding: 16px 20px;
    gap: 6px;
  }

  .filter-btn {
    padding: 6px 14px;
    font-size: 0.72rem;
  }

  .portfolio-grid-section { padding: 24px 20px 60px; }
}