/* =============================================
   NathoAsto — Portfolio Page Styles
   ============================================= */

/* ── Portfolio Hero ── */
.portfolio-hero {
  min-height: 60vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 4rem) 0 4rem;
  position: relative;
  overflow: hidden;
  background: var(--clr-bg);
}
.portfolio-hero-bg {
  position: absolute;
  inset: 0;
  background: var(--grad-hero);
  pointer-events: none;
}
.portfolio-hero .container-na { position: relative; z-index: 1; }

.portfolio-headline {
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 1rem;
}
.portfolio-headline em {
  font-style: italic;
  color: var(--clr-primary);
}
.portfolio-hero > .container-na > p {
  font-size: var(--fs-lg);
  color: var(--clr-text-muted);
  margin-bottom: 2.5rem;
}

/* ── Filter Buttons ── */
.portfolio-filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.filter-btn {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--clr-text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-base);
  font-family: var(--font-body);
}
.filter-btn:hover {
  border-color: rgba(var(--clr-primary-rgb), 0.4);
  color: var(--clr-primary);
}
.filter-btn.active {
  background: var(--grad-primary);
  border-color: transparent;
  color: #000;
  font-weight: 700;
  box-shadow: 0 4px 24px rgba(var(--clr-primary-rgb), 0.3);
}

/* ── Case Studies List ── */
.portfolio-section { padding-top: 0; }

.case-studies-list {
  border-top: 1px solid var(--glass-border);
}

.cs-item {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  padding: 3rem 0;
  border-bottom: 1px solid var(--glass-border);
  cursor: pointer;
  transition: var(--transition-base);
  position: relative;
}
.cs-item::before {
  content: '';
  position: absolute;
  left: -2rem; right: -2rem; top: 0; bottom: 0;
  background: rgba(255,255,255,0.01);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  border-radius: var(--radius-md);
}
.cs-item:hover::before { opacity: 1; }
.cs-item:hover {
  padding-left: 1rem;
}

.cs-number {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--clr-text-sub);
  letter-spacing: 0.06em;
  min-width: 32px;
  padding-top: 0.25rem;
  transition: color 0.3s ease;
}
.cs-item:hover .cs-number { color: var(--clr-primary); }

.cs-main { flex: 1; }

.cs-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.cs-client {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--clr-primary);
  margin-right: 0.25rem;
}

.cs-title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
  line-height: 1.3;
}
.cs-item:hover .cs-title { color: var(--clr-primary); }

.cs-challenge {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  margin-bottom: 1.5rem;
  max-width: 700px;
}
.cs-challenge strong { color: var(--clr-text); }

.cs-results {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}
.cs-result-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.cs-metric {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--clr-primary);
  line-height: 1;
}
.cs-result-item span:last-child {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.cs-arrow {
  font-size: 1.5rem;
  color: var(--clr-text-sub);
  transition: var(--transition-spring);
  padding-top: 0.25rem;
  flex-shrink: 0;
}
.cs-item:hover .cs-arrow {
  color: var(--clr-primary);
  transform: translate(6px, -6px);
}

/* Hide on filter */
.cs-item.hidden {
  display: none;
}

/* ── Cursor Image Follower ── */
.cursor-image-follower {
  position: fixed;
  top: 0; left: 0;
  width: 280px;
  pointer-events: none;
  z-index: var(--z-overlay);
  opacity: 0;
  transform: translate(-50%, -60%) scale(0.8);
  transition: opacity 0.3s ease, transform 0.3s ease;
  will-change: transform;
}
.cursor-image-follower.visible {
  opacity: 1;
  transform: translate(-50%, -60%) scale(1);
}

.cif-screen {
  background: rgba(20,20,20,0.92);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
  backdrop-filter: blur(20px);
}
.cif-browser-bar {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  gap: 5px;
  align-items: center;
}
.cif-browser-bar span {
  width: 9px; height: 9px;
  border-radius: 50%;
  display: block;
}
.cif-content {
  padding: 1rem;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.cif-placeholder {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.cif-line {
  height: 8px;
  border-radius: 4px;
  background: rgba(255,255,255,0.08);
}
.cif-line.w-80 { width: 80%; }
.cif-line.w-60 { width: 60%; }
.cif-line.w-90 { width: 90%; }

/* Case study color accent on hover (dynamic via JS) */
.cs-item.active-hover .cs-metric { color: var(--hover-color, var(--clr-primary)); }

@media (max-width: 991px) {
  .portfolio-headline { font-size: clamp(2.5rem, 7vw, 4rem); }
  .portfolio-filters { gap: 0.5rem; }
  .filter-btn { padding: 9px 18px; font-size: 0.8rem; }
}

@media (max-width: 768px) {
  .portfolio-hero { padding: calc(var(--nav-height) + 2rem) 0 3rem; }
  .portfolio-headline { font-size: clamp(2rem, 7vw, 3rem) !important; }
  .cs-item { flex-direction: row; padding: 2rem 0; gap: 1rem; align-items: flex-start; }
  .cs-results { gap: 1rem; }
  .cs-metric { font-size: 1.25rem; }
  .cs-arrow { display: none; }
  .cursor-image-follower { display: none !important; }
  .portfolio-hero > .container-na > p { font-size: 0.95rem; }
  .cs-item:hover { padding-left: 0; }
}

@media (max-width: 480px) {
  .portfolio-hero { padding: calc(var(--nav-height) + 1.5rem) 0 2.5rem; }
  .portfolio-headline { font-size: clamp(1.75rem, 8vw, 2.5rem) !important; }
  .filter-btn { padding: 7px 12px; font-size: 0.72rem; }
  .portfolio-filters { gap: 0.4rem; }
  .cs-item { padding: 1.5rem 0; gap: 0.75rem; }
  .cs-number { font-size: 0.75rem; min-width: 28px; }
  .cs-title { font-size: 1rem; }
  .cs-challenge { display: none; } /* Hide on very small to save space */
  .cs-metric { font-size: 1.1rem; }
  .cs-result-item span:last-child { font-size: 0.65rem; }
  .cs-client { font-size: 0.75rem; }
}

@media (max-width: 360px) {
  .portfolio-headline { font-size: 1.6rem !important; }
  .cs-results { flex-direction: column; gap: 0.5rem; }
  .filter-btn { padding: 6px 10px; font-size: 0.65rem; }
}