/* ── Reset & Custom Properties ───────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #ffffff;
  --bg-alt: #F8FAFC;
  --bg-dark: #0F172A;
  --text: #0F172A;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --accent: #1E40AF;
  --accent-hover: #1D3A9A;
  --border: #E2E8F0;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max: 1100px;
  --radius: 8px;
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }

/* ── Navigation ──────────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}

#nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  color: var(--text);
  transition: color var(--transition);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

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

.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: background var(--transition);
}

/* ── Hero (landing / about) ──────────────────────────────── */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.75rem;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(30, 64, 175, 0.35);
}

.btn-ghost {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border: 1.5px solid rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: border-color var(--transition), color var(--transition);
}

.btn-ghost:hover {
  border-color: rgba(255,255,255,0.6);
  color: #fff;
}

.btn-outline {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border: 1.5px solid var(--border);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: border-color var(--transition), color var(--transition);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Shared Section Styles ───────────────────────────────── */
.section {
  padding: 100px 2rem;
}

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

.container {
  max-width: var(--max);
  margin: 0 auto;
}

.label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 2.5rem;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 3rem;
  line-height: 1.7;
}

/* ── About ───────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 5rem;
  align-items: start;
}

.about-photo img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--border);
  filter: grayscale(15%);
}

.about-text h2 { margin-bottom: 1.25rem; }

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.8;
}

/* ── CV / Experience ─────────────────────────────────────── */
.cv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.cv-heading {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.cv-item {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.cv-meta { flex-shrink: 0; padding-top: 2px; }

.cv-year {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-light);
  white-space: nowrap;
}

.cv-body h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.cv-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.skill-tag {
  padding: 0.3rem 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── Research ────────────────────────────────────────────── */
.research-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.research-heading {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.pub-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

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

.pub-year {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  padding-top: 3px;
  min-width: 32px;
}

.pub-body h4 {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.4rem;
}

.pub-authors {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.pub-venue {
  font-size: 0.8rem;
  color: var(--text-light);
  font-style: italic;
  margin-bottom: 0.5rem;
}

.pub-doi {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
  transition: opacity var(--transition);
}

.pub-doi:hover { opacity: 0.7; }

/* ── Projects ────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  align-items: stretch;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 2rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  overflow: hidden;
  min-height: 460px;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.07);
}

/* Project image — replace src with your own image to customise */
.project-image {
  display: block;
  width: calc(100% + 4rem);
  margin: -2rem -2rem 1.5rem;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
}

.project-tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 1.5rem;
}

.project-lang {
  font-size: 0.75rem;
  color: var(--text-light);
  font-weight: 500;
  margin-top: auto;
}

.projects-footer {
  text-align: center;
}

/* ── Music toggle ────────────────────────────────────────── */
body.music-hidden #music,
body.music-hidden .nav-music-item { display: none; }

/* ── Music ───────────────────────────────────────────────── */
.music-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

.music-heading {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.music-col-intro {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.music-link-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
  cursor: pointer;
}

.music-link-card:last-of-type { border-bottom: none; }

.music-link-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition);
}

.music-link-card:hover .music-link-title { color: var(--accent); }

.music-link-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.music-video-block { margin-top: 1.25rem; }

.music-video-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

/* ── Composition Cards ───────────────────────────────────── */
.comp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.comp-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 0.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  text-align: center;
  cursor: pointer;
  min-height: 90px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.comp-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.07);
}

.comp-icon { color: var(--accent); }

.comp-title {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.comp-note {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

/* ── PDF Modal ───────────────────────────────────────────── */
.pdf-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(15, 23, 42, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.pdf-modal.open {
  opacity: 1;
  pointer-events: all;
}

.pdf-modal-inner {
  background: var(--bg);
  border-radius: 12px;
  width: min(92vw, 820px);
  height: min(88vh, 960px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.96) translateY(8px);
  transition: transform 0.25s ease;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.25);
}

.pdf-modal.open .pdf-modal-inner {
  transform: scale(1) translateY(0);
}

.pdf-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.pdf-modal-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.pdf-modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition), background var(--transition);
}

.pdf-modal-close:hover {
  color: var(--text);
  background: var(--bg-alt);
}

.pdf-modal-frame {
  flex: 1;
  width: 100%;
  border: none;
  display: block;
}

.video-wrap {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-dark);
}

.video-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
}

@media (max-width: 900px) {
  .music-grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* ── Interests ───────────────────────────────────────────── */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.interest-card {
  padding: 2rem;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
}

.interest-icon {
  color: var(--accent);
  margin-bottom: 1rem;
}

.interest-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.interest-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ── Contact ─────────────────────────────────────────────── */
.contact-container {
  text-align: center;
  max-width: 600px;
}

.contact-container h2 { margin-bottom: 1rem; }

.contact-container > p {
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.contact-links {
  margin-top: 1.5rem;
  display: flex;
  gap: 2rem;
  justify-content: center;
}

.contact-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  padding: 2rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

/* ── Scroll Reveal ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .about-grid        { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-photo       { max-width: 200px; }
  .cv-grid           { grid-template-columns: 1fr; gap: 2.5rem; }
  .research-cols     { grid-template-columns: 1fr; gap: 2.5rem; }
  .projects-grid     { grid-template-columns: repeat(2, 1fr); }
  .interests-grid    { grid-template-columns: 1fr; gap: 1.25rem; }
}

@media (max-width: 600px) {
  .section           { padding: 70px 1.25rem; }
  .nav-links         { display: none; }
  .nav-burger        { display: flex; }
  .projects-grid     { grid-template-columns: 1fr; }
  .footer-inner      { flex-direction: column; gap: 0.5rem; text-align: center; }
}

/* ── Mobile Nav ──────────────────────────────────────────── */
.nav-links.open {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: var(--bg);
  padding: 1.5rem 2rem 2rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  gap: 1rem;
}

.nav-links.open a {
  font-size: 1rem;
  color: var(--text) !important;
}