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

:root {
  --bg: #07070d;
  --surface: #0f0f18;
  --surface2: #16161f;
  --border: rgba(255,255,255,0.07);
  --text: #e2e2ee;
  --muted: #5e5e75;
  --muted2: #8888a0;
  --accent: #7c6dfa;
  --accent2: #22d3ee;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::after {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none; z-index: 9999; opacity: 0.022;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

#progress-bar {
  position: fixed; top: 0; left: 0;
  height: 1px; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 200;
}

.bg-glow {
  position: fixed; pointer-events: none; z-index: 0;
  border-radius: 50%; filter: blur(120px);
}
.bg-glow-1 {
  width: 55vw; height: 55vw; top: -20%; left: -15%;
  background: radial-gradient(circle, rgba(124,109,250,0.06) 0%, transparent 70%);
}
.bg-glow-2 {
  width: 40vw; height: 40vw; bottom: 0; right: -10%;
  background: radial-gradient(circle, rgba(34,211,238,0.04) 0%, transparent 70%);
}

.cursor-glow {
  position: fixed;
  top: 0; left: 0;
  width: 500px; height: 500px;
  pointer-events: none;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,109,250,0.08) 0%, transparent 60%);
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: opacity 0.4s;
  opacity: 0;
  mix-blend-mode: screen;
}

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 3rem;
  background: rgba(7,7,13,0.8); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: 'Playfair Display', serif;
  font-size: 1rem; letter-spacing: 0.02em;
  text-decoration: none; color: var(--text);
}
.nav-links { display: flex; gap: 2.5rem; list-style: none; }
.nav-links a {
  color: var(--muted); text-decoration: none;
  font-size: 0.825rem; font-weight: 500; letter-spacing: 0.02em;
  transition: color 0.2s; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute;
  bottom: -3px; left: 0; right: 0; height: 1px;
  background: var(--accent); transform: scaleX(0); transition: transform 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--text); }
.nav-links a.active::after { transform: scaleX(1); }

/* Hamburger toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  flex-direction: column; gap: 4px;
  cursor: pointer; padding: 6px;
  z-index: 350;
}
.nav-toggle span {
  width: 20px; height: 2px; background: var(--text);
  border-radius: 1px; transition: all 0.3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }
.nav-overlay { display: none; }

/* HERO (homepage) */
.hero {
  min-height: 100vh;
  display: flex; align-items: flex-start;
  padding: 7rem 0 4rem 4rem;
  max-width: 100%; margin: 0;
  position: relative; z-index: 1;
}
.hero-inner { max-width: 640px; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-eyebrow,
.hero h1,
.hero-desc,
.hero-actions {
  opacity: 0;
  animation: fadeUp 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}
.hero-eyebrow  { animation-delay: 0.1s; }
.hero h1       { animation-delay: 0.25s; }
.hero-desc     { animation-delay: 0.45s; }
.hero-actions  { animation-delay: 0.6s; }

h1 em {
  font-style: italic;
  background: linear-gradient(110deg, var(--accent) 0%, var(--accent2) 30%, #c9c2ff 50%, var(--accent2) 70%, var(--accent) 100%);
  background-size: 220% auto;
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  animation: shimmer 6s ease-in-out infinite;
}
@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.75rem; font-weight: 500; color: var(--muted2);
  letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1.75rem;
}
.status-dot {
  width: 6px; height: 6px; border-radius: 50%; background: #22c55e;
  box-shadow: 0 0 0 2px rgba(34,197,94,0.2);
  animation: pdot 2.5s ease-in-out infinite;
}
@keyframes pdot {
  0%,100% { box-shadow: 0 0 0 2px rgba(34,197,94,0.2); }
  50%     { box-shadow: 0 0 0 5px rgba(34,197,94,0.08); }
}

h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 500; line-height: 1.2; letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  white-space: nowrap;
}
.hero-desc {
  font-size: 1.05rem; font-weight: 300; color: var(--muted2);
  line-height: 1.8; margin-bottom: 2.5rem; max-width: 480px;
}
.hero-actions { display: flex; gap: 0.875rem; flex-wrap: wrap; }

/* BUTTONS */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.4rem; border-radius: 7px;
  font-size: 0.875rem; font-weight: 500; letter-spacing: 0.01em;
  text-decoration: none; transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  cursor: pointer; border: none;
  position: relative; overflow: hidden;
}
.btn::before {
  content: ''; position: absolute;
  top: 50%; left: 50%; width: 0; height: 0; border-radius: 50%;
  background: rgba(255,255,255,0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s ease, height 0.5s ease;
}
.btn:hover::before { width: 240px; height: 240px; }
.btn > * { position: relative; z-index: 1; }
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 0 24px rgba(124,109,250,0.3);
}
.btn-primary:hover { background: #6b5de8; transform: translateY(-2px); box-shadow: 0 8px 32px rgba(124,109,250,0.45); }
.btn-ghost { background: transparent; color: var(--muted2); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: rgba(255,255,255,0.2); color: var(--text); background: rgba(255,255,255,0.03); transform: translateY(-2px); }
.btn-secondary {
  background: #1e1e3a; color: #e2e2ee;
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 0 0 12px rgba(124,109,250,0.1);
}
.btn-secondary:hover { background: #2a2a4a; transform: translateY(-2px); box-shadow: 0 4px 20px rgba(124,109,250,0.2); border-color: rgba(124,109,250,0.3); }

/* PAGE HEADER (subpages) */
.page {
  padding: 8rem 3rem 5rem;
  max-width: 960px; margin: 0 auto;
  position: relative; z-index: 1;
}
.page-header { margin-bottom: 3.5rem; opacity: 0; animation: fadeUp 0.8s cubic-bezier(0.2,0.8,0.2,1) 0.1s forwards; }
.page-eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.72rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.15em; margin-bottom: 0.6rem;
}
.page-eyebrow::before { content: ''; width: 18px; height: 1px; background: var(--accent); }

.page-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 700; letter-spacing: -0.015em; margin-bottom: 0.5rem;
}
.page-sub { color: var(--muted2); font-size: 1rem; max-width: 520px; line-height: 1.7; }

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1px; background: var(--border);
  border-radius: 14px; overflow: hidden; border: 1px solid var(--border);
  opacity: 0; animation: fadeUp 0.8s cubic-bezier(0.2,0.8,0.2,1) 0.3s forwards;
}
.card {
  background: var(--surface); padding: 1.75rem;
  text-decoration: none; color: inherit; display: block;
  transition: background 0.2s; position: relative; overflow: hidden;
}
.card::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(124,109,250,0.04), rgba(34,211,238,0.02));
  opacity: 0; transition: opacity 0.3s;
}
.card:hover { background: var(--surface2); }
.card:hover::after { opacity: 1; }
.card:hover .card-arrow { opacity: 1; transform: translateX(0); }

.card-meta {
  font-size: 0.72rem; font-weight: 500; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.6rem;
}
.card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.45rem; line-height: 1.4; }
.card p { font-size: 0.84rem; color: var(--muted); line-height: 1.6; }
.card-arrow {
  display: inline-block; margin-top: 1rem;
  font-size: 0.8rem; color: var(--accent);
  opacity: 0; transform: translateX(-4px); transition: opacity 0.2s, transform 0.2s;
}

/* ARTICLE LIST (blog/papers) */
.article-list {
  display: flex; flex-direction: column;
  border-top: 1px solid var(--border);
  opacity: 0; animation: fadeUp 0.8s cubic-bezier(0.2,0.8,0.2,1) 0.3s forwards;
}
.article {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: 2rem; align-items: baseline;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none; color: inherit;
  transition: padding 0.2s, color 0.2s;
}
.article:hover { padding-left: 1rem; }
.article:hover .article-arrow { opacity: 1; transform: translateX(0); }
.article:hover .article-title { color: var(--accent); }
.article-date {
  font-size: 0.78rem; color: var(--muted);
  letter-spacing: 0.05em; font-variant-numeric: tabular-nums;
}
.article-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.15rem; font-weight: 700;
  transition: color 0.2s;
}
.article-desc { color: var(--muted); font-size: 0.85rem; margin-top: 0.3rem; }
.article-arrow {
  font-size: 0.9rem; color: var(--accent);
  opacity: 0; transform: translateX(-6px);
  transition: opacity 0.25s, transform 0.25s;
}

@media (max-width: 680px) {
  .article { grid-template-columns: 1fr; gap: 0.4rem; padding: 1.25rem 0; }
  .article:hover { padding-left: 0; }
  .article-arrow { display: none; }
}

/* ABOUT PAGE */
.about-grid {
  display: grid; grid-template-columns: 240px 1fr; gap: 3.5rem; align-items: start;
  opacity: 0; animation: fadeUp 0.8s cubic-bezier(0.2,0.8,0.2,1) 0.3s forwards;
}
.about-grid > .about-text { min-width: 0; }
@media (max-width: 680px) { .about-grid { grid-template-columns: 1fr; gap: 2rem; } }

.avatar-wrap { position: sticky; top: 6rem; align-self: start; }
.avatar {
  width: 100%; aspect-ratio: 1;
  border-radius: 14px; object-fit: cover;
  border: 1px solid var(--border);
  filter: grayscale(15%);
}

.about-text p { color: var(--muted2); line-height: 1.85; margin-bottom: 1rem; font-size: 0.975rem; }
.about-text h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.3rem; font-weight: 700;
  margin-top: 2.5rem; margin-bottom: 1rem;
}

.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.25rem; }
.tag {
  font-size: 0.78rem; font-weight: 500; padding: 0.35rem 0.85rem;
  border-radius: 6px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: #c5c8d8;
  transition: all 0.2s; letter-spacing: 0.02em;
}
.tag:hover {
  background: rgba(124,109,250,0.1);
  border-color: rgba(124,109,250,0.3);
  color: var(--text);
}

/* Featured tags — gradient background for headline directions */
.tag.featured {
  background: linear-gradient(135deg, rgba(124,109,250,0.25), rgba(34,211,238,0.18));
  border: 1px solid rgba(124,109,250,0.5);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 0 14px rgba(124,109,250,0.18);
}
.tag.featured:hover {
  background: linear-gradient(135deg, rgba(124,109,250,0.4), rgba(34,211,238,0.3));
  box-shadow: 0 0 20px rgba(124,109,250,0.35);
}

.facts {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--border); border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border); margin-top: 2rem;
}
.fact { padding: 1.25rem; background: var(--surface); }
.fact-num {
  font-family: 'Playfair Display', serif;
  font-size: 1.8rem; font-weight: 700; line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 0.3rem;
}
.fact-label { font-size: 0.78rem; color: var(--muted); }

/* FOOTER */
footer {
  padding: 2.5rem 3rem; max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem; position: relative; z-index: 1;
  border-top: 1px solid var(--border);
}
footer p { font-size: 0.8rem; color: var(--muted); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.8rem; color: var(--muted); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: var(--text); }

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet (768px and below) */
@media (max-width: 768px) {
  .hero { padding: 7rem 2rem 3rem; }
  .page { padding: 7rem 2rem 4rem; }
  .about-grid { grid-template-columns: 180px 1fr; gap: 2.5rem; }
  .article { grid-template-columns: 90px 1fr auto; gap: 1.5rem; }
}

/* Mobile (600px and below) */
@media (max-width: 600px) {
  /* Nav: hamburger toggle */
  nav { padding: 0.9rem 1.5rem; }
  .nav-logo { font-size: 0.9rem; }
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: 0; right: 0;
    width: 70vw; max-width: 280px; height: 100vh;
    flex-direction: column; gap: 0;
    background: rgba(7,7,13,0.97); backdrop-filter: blur(24px);
    padding: 5rem 2rem 2rem;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    border-left: 1px solid var(--border);
    z-index: 300;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links li { padding: 0.8rem 0; }
  .nav-links a { font-size: 1rem; }
  .nav-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 250;
  }
  .nav-overlay.show { display: block; }

  /* Hero */
  .hero { padding: 5.5rem 1.5rem 3rem; }
  h1 { font-size: clamp(1.8rem, 8vw, 2.6rem); white-space: normal; }

  /* About grid: single column */
  .about-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .avatar-wrap { position: static; display: flex; justify-content: center; }
  .avatar { width: 140px; height: 140px; }

  /* Page sections */
  .page { padding: 5rem 1.5rem 3rem; }
  .page-title { font-size: clamp(1.6rem, 7vw, 2.2rem); }

  /* Article list single column */
  .article { grid-template-columns: 1fr; gap: 0.3rem; padding: 1rem 0; }
  .article:hover { padding-left: 0; }
  .article-arrow { display: none; }

  /* Cards */
  .cards { grid-template-columns: 1fr; }

  /* Footer */
  footer { padding: 1.5rem; flex-direction: column; align-items: flex-start; }

  /* Panel dots + hint */
  .panel-dots { bottom: 1.2rem; }
  .slide-hint { right: 1rem; font-size: 0.65rem; }

  /* Cursor glow: hide on touch devices */
  .cursor-glow { display: none; }
}

/* Small phones (375px and below) */
@media (max-width: 375px) {
  h1 { font-size: 1.6rem; }
  .hero-desc { font-size: 0.82rem; }
  .hero-actions { flex-direction: column; gap: 0.6rem; }
  .btn { width: 100%; justify-content: center; }
  .page { padding: 4.5rem 1.2rem 3rem; }
  nav { padding: 0.8rem 1.2rem; }
}