/* ============================================
   Astronomy Academic Homepage — Styles
   Theme: deep space · romantic · academic
   ============================================ */

:root {
  --bg-dark: #050816;
  --bg-deep: #0b1026;
  --text-main: #f5f7ff;
  --text-muted: #aeb7d8;
  --accent-gold: #d8b76a;
  --accent-blue: #7aa2ff;
  --accent-purple: #b388ff;
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.16);
  --glow-gold: rgba(216, 183, 106, 0.35);
  --glow-blue: rgba(122, 162, 255, 0.25);
  --font-serif: "Cormorant Garamond", "Playfair Display", Georgia, serif;
  --font-sans: "Inter", "Source Sans Pro", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;
  --container: min(1100px, 92vw);
  --header-h: 4rem;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-main);
  background: var(--bg-dark);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---- Background layers ---- */
#galaxy-field,
#starfield {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#galaxy-field {
  z-index: 0;
  opacity: 0.92;
}

#starfield {
  z-index: 1;
}

.nebula {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
  transition: transform 0.15s ease-out;
}

.nebula-1 {
  width: 55vw;
  height: 55vw;
  top: -15%;
  right: -10%;
  background: radial-gradient(circle, rgba(179, 136, 255, 0.25) 0%, transparent 70%);
}

.nebula-2 {
  width: 45vw;
  height: 45vw;
  bottom: 10%;
  left: -15%;
  background: radial-gradient(circle, rgba(122, 162, 255, 0.2) 0%, transparent 70%);
}

.parallax-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.15), transparent),
    radial-gradient(1px 1px at 60% 70%, rgba(255, 255, 255, 0.1), transparent),
    radial-gradient(1px 1px at 80% 20%, rgba(216, 183, 106, 0.12), transparent);
  opacity: 0.6;
  transition: transform 0.2s ease-out;
}

/* ---- Layout ---- */
.container {
  width: var(--container);
  margin-inline: auto;
}

.section {
  position: relative;
  z-index: 1;
  padding: 6rem 0;
}

.section-header {
  margin-bottom: 3rem;
  text-align: center;
}

.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.section-desc {
  margin-top: 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.section-desc a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}

.section-desc a:hover {
  border-bottom-color: var(--accent-blue);
}

/* ---- Header / Nav ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.site-header.scrolled {
  background: rgba(5, 8, 22, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--glass-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: var(--container);
  margin-inline: auto;
  padding-inline: 4vw;
}

.nav-logo {
  font-size: 1.25rem;
  color: var(--accent-gold);
  text-decoration: none;
  opacity: 0.9;
  transition: opacity 0.3s, text-shadow 0.3s;
}

.nav-logo:hover {
  opacity: 1;
  text-shadow: 0 0 20px var(--glow-gold);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-main);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---- Hero ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-h);
  text-align: center;
  overflow: hidden;
}

.hero-orbit {
  position: absolute;
  width: min(90vw, 500px);
  height: min(90vw, 500px);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  opacity: 0.5;
  animation: orbit-drift 120s linear infinite;
  pointer-events: none;
}

.orbit-svg {
  width: 100%;
  height: 100%;
}

@keyframes orbit-drift {
  from { transform: translate(-50%, -55%) rotate(0deg); }
  to { transform: translate(-50%, -55%) rotate(360deg); }
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
  color: var(--accent-gold);
  opacity: 0.85;
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text-main) 0%, var(--accent-gold) 50%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-desc {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-style: italic;
  color: var(--text-muted);
  max-width: 36rem;
  margin-inline: auto;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Hero fade-in on load */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  animation: hero-fade-in 1s var(--ease) forwards;
  animation-delay: var(--delay, 0s);
}

@keyframes hero-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  text-decoration: none;
}

.scroll-hint-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--accent-gold));
  animation: scroll-pulse 2.5s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 2px;
  transition: all 0.35s var(--ease);
  cursor: pointer;
}

.btn-primary {
  color: var(--bg-dark);
  background: linear-gradient(135deg, var(--accent-gold), #c9a55a);
  border: 1px solid rgba(216, 183, 106, 0.5);
  box-shadow: 0 0 0 rgba(216, 183, 106, 0);
}

.btn-primary:hover {
  box-shadow: 0 0 28px var(--glow-gold), 0 4px 20px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.btn-secondary {
  color: var(--text-main);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--accent-blue);
  box-shadow: 0 0 24px var(--glow-blue);
  transform: translateY(-2px);
}

/* ---- Glass cards ---- */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 4px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.glass-card:hover {
  border-color: rgba(216, 183, 106, 0.35);
  box-shadow: 0 0 32px rgba(122, 162, 255, 0.08), inset 0 0 40px rgba(255, 255, 255, 0.02);
}

/* ---- About ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3rem;
  align-items: start;
}

.about-text .lead {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 1.85;
  color: var(--text-main);
  margin-bottom: 1.5rem;
}

.about-text .lead em {
  color: var(--accent-gold);
  font-style: italic;
}

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

.about-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  min-width: 0;
  width: 100%;
}

.about-photo-frame {
  margin: 0;
  width: 100%;
  overflow: hidden;
  padding: 0.65rem;
  background: linear-gradient(
    145deg,
    rgba(216, 183, 106, 0.12) 0%,
    rgba(122, 162, 255, 0.08) 50%,
    rgba(179, 136, 255, 0.1) 100%
  );
  border-color: rgba(91, 86, 109, 0.45);
  box-shadow:
    0 0 24px rgba(216, 183, 106, 0.12),
    inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.about-photo-inner {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: 2px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: linear-gradient(160deg, var(--bg-deep) 0%, rgba(11, 16, 38, 0.9) 100%);
  contain: layout paint;
}

.about-photo-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 3px solid rgba(5, 8, 22, 0.5);
  pointer-events: none;
  z-index: 1;
}

.about-photo-inner img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: cover;
  object-position: center center;
}

.about-meta {
  padding: 1.75rem;
}

.about-meta dl > div {
  margin-bottom: 1.25rem;
}

.about-meta dl > div:last-child {
  margin-bottom: 0;
}

.about-meta dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 0.25rem;
}

.about-meta dd {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---- Research cards ---- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.research-card {
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(122, 162, 255, 0.04), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.research-card:hover::before {
  opacity: 1;
}

.card-icon {
  display: block;
  font-size: 1.5rem;
  color: var(--accent-gold);
  margin-bottom: 1rem;
  opacity: 0.8;
}

.research-card h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.research-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ---- Publications ---- */
.citations-panel {
  padding: 2rem;
  margin-bottom: 3rem;
}

.citations-chart-wrap {
  position: relative;
  min-height: 350px;
  margin-bottom: 0.5rem;
}

.citations-chart-wrap .apexcharts-canvas {
  margin: 0 auto;
}

.citations-chart-wrap .apexcharts-tooltip,
.citations-chart-wrap .apexcharts-toolbar {
  display: none !important;
}

.citations-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.pub-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.pub-heading {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--accent-gold);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--glass-border);
}

.pub-list {
  list-style: none;
}

.pub-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

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

.pub-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.45;
  margin-bottom: 0.5rem;
}

.pub-title a {
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.3s;
}

.pub-title a:hover {
  color: var(--accent-blue);
}

.pub-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.pub-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-blue);
  text-decoration: none;
  padding: 0.2rem 0.5rem;
  border: 1px solid rgba(122, 162, 255, 0.3);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

.pub-links a:hover {
  background: rgba(122, 162, 255, 0.12);
  box-shadow: 0 0 12px var(--glow-blue);
}

.pub-citations {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-gold);
}

.pub-loading,
.pub-empty {
  color: var(--text-muted);
  font-style: italic;
  padding: 1rem 0;
}

/* ---- CV Timeline ---- */
.cv-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-gold), var(--accent-purple), transparent);
}

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

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  width: 7px;
  height: 7px;
  margin-left: -3px;
  border-radius: 50%;
  background: var(--accent-gold);
  box-shadow: 0 0 12px var(--glow-gold);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent-gold);
  display: block;
  margin-bottom: 0.35rem;
}

.timeline-item h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.timeline-place {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.cv-details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.cv-block {
  padding: 1.5rem;
}

.cv-block h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--accent-gold);
}

.cv-block ul {
  list-style: none;
}

.cv-block li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.25rem 0;
  padding-left: 1rem;
  position: relative;
}

.cv-block li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent-blue);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.skills-tags li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem !important;
  background: rgba(122, 162, 255, 0.1);
  border: 1px solid rgba(122, 162, 255, 0.2);
  border-radius: 2px;
  color: var(--accent-blue) !important;
}

.skills-tags li::before {
  display: none;
}

.cv-skills-list li {
  padding-left: 1rem;
}

.cv-download-wrap {
  text-align: center;
}

/* ---- Contact ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.contact-info {
  padding: 2rem;
}

.contact-info dl > div {
  margin-bottom: 1.25rem;
}

.contact-info dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 0.2rem;
}

.contact-info dd {
  color: var(--text-muted);
}

.contact-info dd a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.3s;
}

.contact-info dd a:hover {
  color: var(--text-main);
}

.contact-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--glass-border);
}

.contact-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.3s, text-shadow 0.3s;
}

.contact-links a:hover {
  color: var(--accent-gold);
  text-shadow: 0 0 16px var(--glow-gold);
}

.contact-quote {
  border: none;
  padding: 0;
}

.contact-quote p {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-style: italic;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---- Footer ---- */
.site-footer {
  position: relative;
  z-index: 1;
  padding: 3rem 0;
  border-top: 1px solid var(--glass-border);
  text-align: center;
}

.footer-theme {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent-gold);
  opacity: 0.7;
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---- Scroll reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .about-grid,
  .cv-layout,
  .contact-grid,
  .pub-columns {
    grid-template-columns: 1fr;
  }

  .about-sidebar {
    max-width: 320px;
    margin: 0 auto;
  }

  .research-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    background: rgba(5, 8, 22, 0.95);
    backdrop-filter: blur(16px);
    padding: 1.5rem 0 2rem;
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s var(--ease), opacity 0.35s, visibility 0.35s;
    border-bottom: 1px solid var(--glass-border);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 0.85rem 1rem;
  }

  .section {
    padding: 4.5rem 0;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-in,
  .reveal,
  .hero-orbit,
  .scroll-hint-line,
  .nebula,
  .parallax-layer,
  #galaxy-field {
    animation: none !important;
    transition: none !important;
  }

  .fade-in,
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
}