/* ========================================
   PORTFOLIO v3 — Cinematic
   ======================================== */

:root {
  --bg: #faf8f4;
  --bg-dark: #0c0c0c;
  --text: #1a1a1a;
  --text-light: #e8e6e0;
  --text-mid: #555;
  --text-muted: #999;
  --accent: #b08d57;
  --accent-hover: #c9a46a;
  --border: #e0dcd4;
  --border-dark: #2a2a2a;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* --- Particle Canvas --- */
#particle-canvas {
  position: absolute;
  top: 0;
  right: 0;
  width: 80vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at top right, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at top right, black 30%, transparent 75%);
}

/* --- Nav --- */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  background: transparent;
  transition: background 0.4s, backdrop-filter 0.4s;
}

nav.scrolled {
  background: rgba(250, 248, 244, 0.85);
  backdrop-filter: blur(20px);
}

nav.scrolled.on-dark {
  background: rgba(12, 12, 12, 0.85);
}

.nav-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s, opacity 0.4s, transform 0.4s;
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
}

nav.past-hero .nav-name {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

nav.on-dark .nav-name {
  color: var(--text-light);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-mid);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.3s;
}

nav.on-dark .nav-links a {
  color: rgba(255,255,255,0.5);
}

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

nav.on-dark .nav-links a:hover {
  color: var(--text-light);
}

.nav-cta {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: all 0.3s;
}

nav.on-dark .nav-cta {
  border-color: var(--border-dark);
}

.nav-cta:hover {
  background: var(--text);
  color: #fff !important;
  border-color: var(--text);
}

/* --- Layout --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 3rem;
}

section {
  padding: 8rem 0;
  position: relative;
}

/* --- Dark sections --- */
.dark {
  background: var(--bg-dark);
  color: var(--text-light);
}

.dark h2, .dark h3 {
  color: var(--text-light);
}

.dark p {
  color: rgba(255,255,255,0.6);
}

.dark .section-label {
  color: var(--accent);
}

.dark em {
  color: var(--text-light);
}

/* --- Typography --- */
h1 {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 2rem;
}

h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-mid);
  font-size: 1.05rem;
}

p.large {
  font-size: 1.3rem;
  line-height: 1.7;
  color: var(--text);
  max-width: 700px;
}

.dark p.large {
  color: rgba(255,255,255,0.8);
}

em {
  font-style: italic;
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  display: block;
  margin-bottom: 1.5rem;
}

/* --- Hero --- */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 3rem;
  position: relative;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

h1 .line {
  display: block;
}

h1 .accent {
  color: var(--accent);
  font-style: italic;
}

.hero-sub {
  margin-top: 2.5rem;
  font-size: 1.1rem;
  color: var(--text-mid);
  max-width: 560px;
  line-height: 1.8;
}

.hero-descriptor {
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0;
}

.scroll-hint {
  position: absolute;
  bottom: 3rem;
  left: 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.scroll-hint span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: var(--border);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--accent);
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

/* --- Split layout --- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

.split-left h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  line-height: 1.25;
  position: sticky;
  top: 8rem;
}

/* --- Numbers --- */
#numbers {
  padding: 5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.number {
  display: block;
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.number-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* --- Tags --- */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-muted);
}

.dark .tag {
  border-color: var(--border-dark);
  color: rgba(255,255,255,0.4);
}

/* --- Research --- */
.research-body {
  max-width: 750px;
}

.research-details {
  margin-top: 2rem;
}

/* --- Projects --- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 3rem;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2.5rem 2rem;
  transition: all 0.4s ease;
  position: relative;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.06);
}

.project-status {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  display: block;
  margin-bottom: 1rem;
}

.project-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text);
  margin-bottom: 1rem;
}

.project-card p {
  font-size: 0.92rem;
}

.project-link {
  display: inline-block;
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s, letter-spacing 0.3s;
}

.project-link:hover {
  color: var(--accent-hover);
  letter-spacing: 0.15em;
}

/* --- Teaching --- */
.course-list {
  margin-top: 3rem;
  border-top: 1px solid var(--border-dark);
}

.course-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-dark);
  transition: padding-left 0.3s ease;
}

.course-item:hover {
  padding-left: 1rem;
}

.course-level {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.3);
  min-width: 120px;
}

.course-name {
  font-size: 1.05rem;
  color: var(--text-light);
  flex: 1;
  text-align: right;
}

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

.cv-entry {
  display: flex;
  flex-direction: column;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.cv-date {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.cv-entry strong {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.15rem;
}

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

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.85rem 2.25rem;
  border: 1px solid var(--text);
  color: var(--text);
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.3s;
}

.btn:hover {
  background: var(--text);
  color: var(--bg);
}

/* --- Contact --- */
.contact-section {
  text-align: center;
  padding: 4rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-section h2 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

.contact-section p.large {
  text-align: center;
  max-width: 500px;
}

.contact-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 3rem;
}

.contact-btn {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-light);
  padding: 0.85rem 2rem;
  border: 1px solid var(--border-dark);
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.3s;
}

.contact-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* --- Footer --- */
footer {
  padding: 2rem 3rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0;
}

/* --- Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.5s; }
.delay-3 { animation-delay: 0.8s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal.exit-top {
  opacity: 0;
  transform: translateY(-40px);
}

/* --- Hamburger button --- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  z-index: 110;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
  transform-origin: center;
}

nav.on-dark .nav-hamburger span {
  background: var(--text-light);
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Mobile menu overlay --- */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.mobile-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* --- Mobile menu drawer --- */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(80vw, 300px);
  height: 100vh;
  background: var(--bg);
  z-index: 200;
  padding: 5rem 2.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.12);
}

.mobile-menu.open {
  right: 0;
}

.mobile-link {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-mid);
  text-decoration: none;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.mobile-link:hover {
  color: var(--text);
}

.mobile-link-cta {
  margin-top: 1rem;
  border-bottom: none;
  color: var(--accent);
  font-weight: 600;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 3rem; }
  .split-left h2 { position: static; }
  .numbers-grid { grid-template-columns: repeat(2, 1fr); }
  .project-grid { grid-template-columns: 1fr; }
  .cv-columns { grid-template-columns: 1fr; }
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  section { padding: 5rem 0; }
  #hero { padding: 0 1.5rem; }
  .container { padding: 0 1.5rem; }
  .scroll-hint { left: 1.5rem; }
}