/* ═══════════════════════════════════════════════════════════
   About Page — Timeline, Credentials, Approach
   ═══════════════════════════════════════════════════════════ */

.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dim), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 3rem;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.5rem;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  z-index: 1;
  transform: translateX(-5px);
}

.timeline-item h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: 0.25rem;
}

.timeline-org {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-dim);
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

.timeline-date { color: var(--text-tertiary); font-weight: 400; }

.timeline-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 600px;
}

.timeline-points {
  list-style: none;
  margin: 0.85rem 0 0;
  padding: 0;
  max-width: 600px;
}

.timeline-points li {
  position: relative;
  padding: 0.25rem 0 0.25rem 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.timeline-points li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--accent-dim);
}

/* ── Recognition section: 2×2 cert grid with tall thumbnails ── */
.recognition-section { padding-top: 1rem; }

.recognition-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.recognition-footnote {
  margin-top: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-tertiary);
  line-height: 1.5;
}

.recognition-footnote a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 165, 90, 0.35);
  transition: border-color 0.2s;
}

.recognition-footnote a:hover {
  border-bottom-color: var(--accent);
}

/* Override thumbnail height for recognition grid — taller = more cert visible */
.recognition-grid .cert-img-card-thumb {
  aspect-ratio: 3 / 2;
}

/* ── Credentials: 2×2 image card grid ── */
.credentials-grid--image {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.cert-img-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  text-align: left;
  width: 100%;
  padding: 0;
  transition: border-color 0.25s, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s;
  font-family: var(--font-body);
}

.cert-img-card:hover {
  border-color: rgba(201, 165, 90, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.cert-img-card-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--bg-secondary);
}

.cert-img-card-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.4s ease, filter 0.4s ease;
  filter: grayscale(15%);
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
}

.cert-img-card:hover .cert-img-card-thumb img {
  transform: scale(1.04);
  filter: grayscale(0%);
}

.cert-img-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 8, 10, 0.55);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--white);
  opacity: 0;
  transition: opacity 0.25s;
  backdrop-filter: blur(2px);
}

.cert-img-card-overlay svg { color: var(--accent); }

.cert-img-card-overlay span {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

.cert-img-card:hover .cert-img-card-overlay { opacity: 1; }

/* Transparent guard: prevents right-click/drag on the thumbnail */
.cert-img-card-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
}

.cert-img-card-overlay { z-index: 2; }

.cert-img-card-info {
  padding: 0.9rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.cert-img-card-title {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--white);
  line-height: 1.3;
}

.cert-img-card-sub {
  font-size: 0.76rem;
  color: var(--text-tertiary);
}

/* ── Credentials: compact text row (MSc + Civil Engineer) ── */
.credentials-grid--compact {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.credential-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1.75rem;
  text-align: center;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.credential-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 12px;
  background: radial-gradient(circle at 50% 0%, rgba(201, 165, 90, 0.08) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.credential-card:hover {
  border-color: var(--border);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.credential-card:hover::after { opacity: 1; }

.credential-card--compact {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-align: left;
  padding: 1.25rem 1.5rem;
}

.credential-card-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  margin: 0 auto 1rem;
  border-radius: 10px;
  background: var(--accent-glow);
  border: 1px solid rgba(201, 165, 90, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.credential-card--compact .credential-card-icon {
  margin: 0;
}

.credential-card h4 {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--white);
  margin-bottom: 0.35rem;
}

.credential-card p {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  margin: 0;
}

/* View certificate button */
.cert-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.35rem 0.9rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: transparent;
  border: 1px solid rgba(201, 165, 90, 0.35);
  border-radius: 20px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  font-family: var(--font-body);
}

.cert-btn:hover {
  background: rgba(201, 165, 90, 0.12);
  border-color: var(--accent);
  color: var(--accent);
}

/* Certificate lightbox */
.cert-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.cert-lightbox[hidden] { display: none; }

.cert-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 8, 10, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.cert-lightbox-panel {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: min(860px, 100%);
  width: 100%;
}

.cert-lightbox-close {
  align-self: flex-end;
  margin-bottom: 0.75rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  font-family: var(--font-body);
}

.cert-lightbox-close:hover {
  background: var(--bg-card-hover);
  color: var(--white);
}

.cert-lightbox-img-wrap {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
  max-height: 78vh;
}

/* Transparent overlay blocks right-click/drag on the image */
.cert-lightbox-guard {
  position: absolute;
  inset: 0;
  z-index: 1;
  user-select: none;
  -webkit-user-drag: none;
}

.cert-lightbox-img-wrap img {
  display: block;
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.cert-lightbox-title {
  margin-top: 1rem;
  font-size: 0.82rem;
  color: var(--text-tertiary);
  text-align: center;
}

/* How I work */
.approach-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 720px;
}

/* ─── Responsive ─── */
@media (max-width: 968px) {
  .timeline {
    padding-left: 1.7rem;
  }
  .timeline-item::before {
    left: -1.7rem;
    width: 10px;
    height: 10px;
    transform: translateX(-4px);
  }
  .timeline-item {
    padding-bottom: 2.25rem;
  }
  .recognition-grid,
  .credentials-grid--image,
  .credentials-grid--compact {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .credential-card--compact {
    align-items: flex-start;
  }
  .approach-text {
    font-size: 1rem;
    line-height: 1.75;
  }
}

@media (max-width: 640px) {
  .credentials-grid--image,
  .credentials-grid--compact { grid-template-columns: 1fr; }
  .timeline-item h3 { font-size: 1.12rem; }
  .timeline-item p,
  .timeline-points li { font-size: 0.88rem; }
  .cert-lightbox { padding: 1rem; }
  .cert-lightbox-img-wrap { max-height: 72vh; }
  .cert-lightbox-img-wrap img { max-height: 72vh; }
}

@media (min-width: 1440px) {
  .credential-card    { padding: 2rem; }
  .credential-card h4 { font-size: 1.05rem; }
  .credential-card p  { font-size: 0.88rem; }
  .cert-img-card-title { font-size: 0.95rem; }
  .cert-img-card-sub   { font-size: 0.82rem; }
  .timeline-item h3   { font-size: 1.4rem; }
  .timeline-item p    { font-size: 1rem; max-width: 680px; }
  .timeline-points,
  .timeline-points li { max-width: 680px; }
  .approach-text      { font-size: 1.15rem; max-width: 800px; }
}