/* ============================================================
   Project Detail Page Styles
   ============================================================ */

/* Hero */
.project-hero {
  position: relative;
  height: 55vh;
  min-height: 360px;
  overflow: hidden;
  margin-top: 0;
}

.project-hero-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #0d1117 0%, #131a23 60%, #0d1520 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.project-hero-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(0,212,255,0.06) 0%, transparent 70%);
}

.project-hero-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.project-hero-num {
  display: block;
  font-size: 8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: rgba(0,212,255,0.12);
  letter-spacing: -6px;
  line-height: 1;
}

.project-hero-label {
  font-size: 0.75rem;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 12px;
}

.project-hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}

/* Article layout */
.project-article {
  padding: 64px 0 120px;
}

/* Header */
.project-header {
  margin-bottom: 72px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.5px;
  margin-bottom: 24px;
  transition: color var(--transition);
}

.back-link:hover { color: var(--accent); }

.project-title {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -2.5px;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 22px;
}

.project-meta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.project-tech-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tech-tag {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  padding: 5px 14px;
  border: 1px solid rgba(var(--accent-rgb), 0.3);
  border-radius: 20px;
  background: rgba(var(--accent-rgb), 0.06);
  letter-spacing: 0.5px;
}

.project-year {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-left: auto;
}

/* Sections */
.project-section {
  margin-bottom: 72px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--border);
}

.project-section:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
}

.project-section h2 {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.8px;
  color: var(--text);
  margin-bottom: 24px;
  position: relative;
  padding-left: 18px;
}

.project-section h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 70%;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  border-radius: 2px;
}

.project-section p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.85;
  max-width: 700px;
  margin-bottom: 16px;
}

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

/* Tech grid */
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.tech-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  transition: all var(--transition);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
}

.tech-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.tech-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

/* Challenges */
.challenges-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.challenge-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.challenge-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  padding: 8px 12px;
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  border-radius: 8px;
  background: rgba(var(--accent-rgb), 0.06);
  min-width: 52px;
  text-align: center;
  margin-top: 2px;
}

.challenge-item h4 {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.challenge-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin: 0;
  max-width: none;
}

/* Lessons list */
.lessons-list {
  margin-top: 16px;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lessons-list li {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  padding-left: 22px;
  position: relative;
}

.lessons-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

/* Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: auto auto;
  gap: 14px;
}

.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.4s var(--ease);
}

.gallery-item:hover {
  border-color: var(--border-hover);
  transform: scale(1.01);
  box-shadow: 0 16px 40px rgba(0,0,0,0.3);
}

.gallery-item-large {
  grid-column: 1 / -1;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Project navigation */
.project-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0;
  border-top: 1px solid var(--border);
  margin-top: 40px;
  gap: 20px;
}

.project-nav-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  text-decoration: none;
  transition: all var(--transition);
  max-width: 200px;
}

.project-nav-item-right { text-align: right; }

.project-nav-item:hover { transform: translateX(-4px); }
.project-nav-item-right:hover { transform: translateX(4px); }

.project-nav-dir {
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.project-nav-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.2px;
}

.project-nav-all {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 20px;
  transition: all var(--transition);
  white-space: nowrap;
}

.project-nav-all:hover {
  color: var(--accent);
  border-color: var(--border-hover);
  background: rgba(var(--accent-rgb), 0.05);
}

/* Responsive */
@media (max-width: 768px) {
  .project-hero { height: 40vh; min-height: 260px; }
  .project-hero-num { font-size: 5rem; }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-item-large { grid-column: 1; }
  .project-nav { flex-direction: column; text-align: center; }
  .project-nav-item, .project-nav-item-right { max-width: 100%; text-align: center; }
  .challenge-item { flex-direction: column; gap: 12px; }
}