/* ==========================================================================
   PORTFOLIO - Single Page Design
   ========================================================================== */

:root {
  --accent: #a51c30;
  --accent-light: #f9ecee;
  --accent-mid: #8c1826;
  --text: #1a1a1a;
  --text-sec: #4a4a4a;
  --text-muted: #8a8a8a;
  --bg: #ffffff;
  --bg-alt: #f5f7f8;
  --border: #e2e6ea;
  --radius: 10px;
}

/* --- Base --- */
.portfolio-body {
  margin: 0;
  padding: 0;
  font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.portfolio-body .masthead,
.portfolio-body .page__footer {
  display: none !important;
}

/* --- Nav --- */
.pf-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

.pf-nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2em;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pf-nav-name {
  font-weight: 700;
  font-size: 0.95em;
  color: var(--text);
  text-decoration: none;
}

.pf-nav-links a {
  font-size: 0.82em;
  font-weight: 600;
  color: var(--text-sec);
  text-decoration: none;
  margin-left: 2em;
  transition: color 0.2s;
}

.pf-nav-links a:hover {
  color: var(--accent);
}

/* --- Main --- */
.pf-main {
  padding-top: 52px;
}

/* --- One consistent container --- */
.pf-container,
.pf-container-wide {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2em;
}

/* --- Sections --- */
.pf-section {
  padding: 4.5em 0;
}

.pf-section-alt {
  background: var(--bg-alt);
}

.pf-section-title {
  font-size: 1.5em;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 1.2em 0;
  letter-spacing: -0.02em;
}

.pf-section-title::after {
  content: '';
  display: block;
  width: 32px;
  height: 2.5px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.35em;
}

.pf-accent {
  color: var(--accent);
  font-weight: 600;
}

.pf-muted {
  color: var(--text-muted);
}

/* ==================== HERO ==================== */
.pf-hero {
  display: flex;
  align-items: center;
  padding: 3em 0;
}

.pf-hero-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2em;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5em;
}

.pf-hero-text {
}

.pf-hero-hello {
  font-size: 0.85em;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.4em;
}

.pf-hero-name {
  font-size: 3em;
  font-weight: 800;
  line-height: 1.08;
  margin: 0 0 0.35em 0;
  letter-spacing: -0.03em;
  color: var(--text);
}

.pf-hero-tagline {
  font-size: 1.12em;
  line-height: 1.5;
  color: var(--text-sec);
  margin: 0 0 0.8em 0;
}

.pf-hero-sub {
  font-size: 0.9em;
  line-height: 1.65;
  color: var(--text-muted);
  margin: 0 0 1.2em 0;
}

.pf-hero-seeking {
  font-size: 0.85em;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 1.5em 0;
}

.pf-hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 1.5em;
}

.pf-hero-photo {
  flex-shrink: 0;
}

.pf-hero-photo img {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
  border: 4px solid white;
}

/* --- Buttons --- */
.pf-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.82em;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none !important;
  transition: all 0.15s ease;
  background: var(--accent);
  color: white !important;
}

.pf-btn:hover {
  background: var(--accent-mid);
}

.pf-btn-outline {
  background: transparent;
  color: var(--text) !important;
  border: 1.5px solid var(--border);
}

.pf-btn-icon {
  background: transparent;
  color: var(--text-sec) !important;
  font-size: 1.2em;
  padding: 8px;
}

.pf-btn-icon:hover {
  color: var(--accent) !important;
  background: transparent;
}

.pf-btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
  background: var(--accent-light);
}

/* ==================== ABOUT ==================== */
.pf-edu-row {
  display: flex;
  gap: 1em;
  margin-bottom: 2em;
}

.pf-edu-card {
  display: flex;
  align-items: flex-start;
  gap: 0.8em;
  flex: 1;
  padding: 1em 1.2em;
  background: var(--bg-alt);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.pf-edu-icon {
  color: var(--accent);
  font-size: 1.1em;
  margin-top: 3px;
}

.pf-edu-degree {
  font-size: 0.95em;
  font-weight: 700;
  color: var(--text);
}

.pf-edu-detail {
  font-size: 0.82em;
  color: var(--text-sec);
  margin-top: 2px;
}

.pf-edu-school {
  font-size: 0.82em;
  color: var(--text-sec);
  margin-top: 2px;
}

.pf-about-bio {
  margin-bottom: 2em;
}

.pf-about-bio p {
  font-size: 0.92em;
  line-height: 1.75;
  color: var(--text-sec);
  margin: 0 0 1em 0;
}

.pf-about-bio a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-light);
  text-underline-offset: 2px;
}

.pf-skills-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.5em;
}

.pf-skill-group {
  /* no extra styling needed */
}

.pf-chip-label {
  font-size: 0.65em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.5em;
}

.chip {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75em;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  border-radius: 14px;
  margin: 0 4px 5px 0;
  white-space: nowrap;
}

.chip i {
  margin-right: 3px;
  font-size: 0.85em;
  opacity: 0.6;
}

/* ==================== RESEARCH ==================== */
.pf-research-intro {
  margin-bottom: 3em;
}

.pf-research-intro p {
  font-size: 0.92em;
  line-height: 1.75;
  color: var(--text-sec);
}

.pf-research-area {
  margin-bottom: 3.5em;
  padding-bottom: 3.5em;
  border-bottom: 1px solid var(--border);
}

.pf-research-area:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.pf-area-title {
  font-size: 1.2em;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 1em 0;
}

.pf-research-fig {
  margin-bottom: 1.5em;
}

.pf-research-fig svg {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}

.pf-research-text {
  margin-bottom: 1.5em;
}

.pf-research-text p {
  font-size: 0.9em;
  line-height: 1.75;
  color: var(--text-sec);
  margin: 0 0 1em 0;
}

.pf-research-tldr {
  font-size: 0.95em !important;
  font-weight: 600 !important;
  color: var(--text) !important;
  line-height: 1.55 !important;
  margin: 0 0 1em 0 !important;
}

.pf-research-meta {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
}

.pf-research-pubs-label {
  font-size: 0.65em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.3em;
}

.pf-pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pf-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75em;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
  color: var(--accent) !important;
  text-decoration: none !important;
  transition: all 0.15s;
}

.pf-link-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent);
}

.pf-link-btn-accent {
  background: var(--accent) !important;
  color: white !important;
  border-color: var(--accent) !important;
}

.pf-link-btn-accent:hover {
  background: var(--accent-mid) !important;
}

.pf-rcard-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.pf-rcard-tags span {
  font-size: 0.7em;
  padding: 3px 8px;
  border-radius: 10px;
  background: white;
  border: 1px solid var(--border);
  color: var(--text-sec);
  font-weight: 500;
}

/* ==================== PUBLICATIONS ==================== */
.pf-pub-list {
  display: flex;
  flex-direction: column;
}

.pf-pub {
  padding: 1em 0;
  border-bottom: 1px solid var(--border);
}

.pf-pub:last-child {
  border-bottom: none;
}

.pf-pub-first-author {
  border-left: 3px solid var(--accent);
  padding-left: 1em;
}

.pf-pub-title {
  font-size: 0.9em;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 3px;
}

.pf-pub-desc {
  font-size: 0.8em;
  color: var(--text-sec);
  margin-bottom: 3px;
  font-style: italic;
  line-height: 1.45;
}

.pf-pub-meta {
  font-size: 0.78em;
  color: var(--text-muted);
}

.pf-pub-venue {
  font-size: 0.78em;
  color: var(--text-muted);
  margin-bottom: 3px;
}

.pf-pub .pf-pub-links {
  margin-top: 5px;
}

/* ==================== GALLERY ==================== */
.pf-gallery {
  columns: 4;
  column-gap: 10px;
}

.pf-gal-item {
  break-inside: avoid;
  margin-bottom: 10px;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
  background: #eee;
}

.pf-gal-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.4s ease;
}

.pf-gal-item:hover img {
  transform: scale(1.03);
}

.pf-gal-cap {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2em 0.8em 0.5em;
  background: linear-gradient(transparent, rgba(0,0,0,0.5));
  color: white;
  font-size: 0.72em;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.3s;
}

.pf-gal-item:hover .pf-gal-cap {
  opacity: 1;
}

/* ==================== FOOTER ==================== */
.pf-footer {
  padding: 2em 0;
  border-top: 1px solid var(--border);
}

.pf-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82em;
}

.pf-footer-links {
  display: flex;
  gap: 1em;
}

.pf-footer-links a {
  color: var(--text-muted);
  font-size: 1.1em;
  transition: color 0.2s;
  text-decoration: none;
}

.pf-footer-links a:hover {
  color: var(--accent);
}

/* ==================== SMOOTH SCROLL ==================== */
html {
  scroll-behavior: smooth;
}

/* ==================== LINKS ==================== */
.pf-main a {
  color: var(--accent);
  text-decoration: none;
}

.pf-main a:hover {
  text-decoration: underline;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .pf-hero-content {
    flex-direction: column-reverse;
    text-align: center;
    gap: 2em;
  }

  .pf-hero-name { font-size: 2.2em; }
  .pf-hero-sub { max-width: none; }
  .pf-hero-links { justify-content: center; }

  .pf-hero-photo img {
    width: 180px;
    height: 180px;
  }

  .pf-edu-row { flex-direction: column; }
  .pf-skills-row { grid-template-columns: 1fr; gap: 1em; }

  .pf-gallery { columns: 2; column-gap: 6px; }
  .pf-gal-item { margin-bottom: 6px; }

  .pf-section { padding: 3em 0; }
  .pf-container, .pf-container-wide, .pf-hero-content {
    padding: 0 1.2em;
  }

  .pf-footer-inner {
    flex-direction: column;
    gap: 1em;
    text-align: center;
  }
}

/* ==================== PAGE ANIMATION ==================== */
.pf-section {
  animation: fadeIn 0.4s ease both;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}