/* ═══════════════════════════════════════
   BASE — Variables, Reset, Typography
   ═══════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Share+Tech+Mono&family=Inter:wght@300;400;500&display=swap');

:root {
  --bg:        #020812;
  --bg2:       #050e1f;
  --navy:      #0a1628;
  --neon:      #00f5ff;
  --neon2:     #7b2fff;
  --neon3:     #00ff88;
  --neon-warn: #ffb300;
  --text:      #c8d8f0;
  --muted:     #5a7a9a;
  --border:    rgba(0, 245, 255, 0.15);
  --card:      rgba(5, 20, 45, 0.75);

  --glow-cyan:   0 0 20px rgba(0, 245, 255, 0.35);
  --glow-purple: 0 0 20px rgba(123, 47, 255, 0.35);
  --glow-green:  0 0 20px rgba(0, 255, 136, 0.35);

  --font-display: 'Orbitron', monospace;
  --font-mono:    'Share Tech Mono', monospace;
  --font-body:    'Inter', sans-serif;

  --radius: 0px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
  cursor: none;
  line-height: 1.6;
}

/* Scanline sweep */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: rgba(0, 245, 255, 0.04);
  pointer-events: none;
  z-index: 200;
  animation: scanline 9s linear infinite;
}

/* Grid texture */
.grid-deco {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(0,245,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,245,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
  pointer-events: none;
}

/* ── Section layout ── */
.section-wrap {
  position: relative;
  z-index: 1;
  padding: 6rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
}

.section-header { margin-bottom: 3.5rem; }

.section-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--neon3);
  letter-spacing: 3px;
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 2px;
  color: #fff;
}

.section-line {
  width: 60px; height: 2px;
  background: linear-gradient(90deg, var(--neon), transparent);
  margin-top: 1rem;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 2px;
  padding: 0.85rem 1.8rem;
  text-decoration: none;
  cursor: none;
  position: relative;
  overflow: hidden;
  transition: color var(--transition);
  border: none;
}

.btn-primary {
  color: var(--neon);
  border: 1px solid var(--neon);
  background: transparent;
}
.btn-primary::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--neon);
  transform: translateX(-100%);
  transition: transform var(--transition);
  z-index: -1;
}
.btn-primary:hover { color: var(--bg); }
.btn-primary:hover::before { transform: translateX(0); }

.btn-secondary {
  color: var(--muted);
  border: 1px solid var(--border);
  background: transparent;
}
.btn-secondary:hover {
  color: var(--text);
  border-color: var(--muted);
}

.btn-green {
  color: var(--neon3);
  border: 1px solid var(--neon3);
  background: transparent;
  font-size: 0.72rem;
  padding: 0.5rem 1rem;
}
.btn-green::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--neon3);
  transform: translateX(-100%);
  transition: transform var(--transition);
  z-index: -1;
}
.btn-green:hover { color: var(--bg); }
.btn-green:hover::before { transform: translateX(0); }

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ── Keyframes ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}
@keyframes scanline {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(100vh); }
}
@keyframes pulse-border {
  0%, 100% { border-color: rgba(0,245,255,0.15); }
  50%       { border-color: rgba(0,245,255,0.45); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Cursor blink ── */
.cursor-blink {
  display: inline-block;
  width: 2px; height: 1.1em;
  background: var(--neon);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
  margin-left: 3px;
}

/* ── Utility ── */
.text-neon   { color: var(--neon); }
.text-neon2  { color: var(--neon2); }
.text-neon3  { color: var(--neon3); }
.text-muted  { color: var(--muted); }
.font-mono   { font-family: var(--font-mono); }
.font-display{ font-family: var(--font-display); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .section-wrap { padding: 4rem 1.5rem; }
}

/* ── Fix: replace hard-to-read violet on dark bg ── */
/* All #a78bfa purple text replaced with lighter readable version */
.tech-pill, .blog-tag { color: #c4b5fd !important; }  /* lighter purple */

/* ═══════════════════
   RESEARCH SECTION
   ═══════════════════ */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.2rem;
}

.research-card {
  background: var(--card);
  border: 1px solid rgba(0,255,136,0.2);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(12px);
}
.research-card:hover {
  border-color: var(--neon3);
  transform: translateY(-5px);
  box-shadow: var(--glow-green);
}
.research-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon3), var(--neon));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s;
}
.research-card:hover::before { transform: scaleX(1); }

.research-status {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 2px;
  padding: 0.18rem 0.55rem;
  border: 1px solid;
  margin-bottom: 1rem;
  display: inline-block;
}
.research-status.active {
  color: var(--neon3);
  border-color: rgba(0,255,136,0.4);
  background: rgba(0,255,136,0.07);
}
.research-status.completed {
  color: var(--neon);
  border-color: rgba(0,245,255,0.4);
  background: rgba(0,245,255,0.07);
}

.research-title {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 1px;
  color: #fff;
  margin-bottom: 0.7rem;
  line-height: 1.35;
}

.research-venue {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--neon3);
  letter-spacing: 1px;
  margin-bottom: 0.8rem;
}

.research-desc {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 1.3rem;
}

.research-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1.2rem; }
.research-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 0.2rem 0.55rem;
  background: rgba(0,255,136,0.06);
  border: 1px solid rgba(0,255,136,0.2);
  color: #6ee7b7;
  letter-spacing: 0.5px;
}

.research-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--neon3);
  text-decoration: none;
  border-bottom: 1px solid rgba(0,255,136,0.3);
  padding-bottom: 1px;
  letter-spacing: 1px;
  transition: opacity var(--transition);
}
.research-link:hover { opacity: 0.7; }