:root {
  --black: #0a0a0a;
  --dark: #111111;
  --card-bg: #161616;
  --green: #7bc618;
  --green-bright: #a0e040;
  --green-dim: #4a7a0a;
  --green-glow: rgba(123, 198, 24, 0.15);
  --gray: #2a2a2a;
  --text: #e8e8e8;
  --text-dim: #888;
  --border: rgba(123, 198, 24, 0.2);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--text);
  font-family: 'Rajdhani', sans-serif;
  overflow-x: hidden;
  cursor: none;
}

/* Custom Cursor */
.cursor {
  width: 12px; height: 12px;
  background: var(--green);
  border-radius: 50%;
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9999;
  transition: transform 0.1s;
  mix-blend-mode: screen;
}
.cursor-ring {
  width: 36px; height: 36px;
  border: 1px solid var(--green);
  border-radius: 50%;
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.5;
  transition: all 0.15s ease;
}

/* Binary Rain Canvas */
#matrix-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  opacity: 0.04;
  z-index: 0;
  pointer-events: none;
}

/* NAV */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 60px;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Space Mono', monospace;
  font-size: 14px;
  color: var(--green);
  letter-spacing: 2px;
  text-decoration: none;
}

.nav-logo-icon {
  width: 36px; height: 36px;
  border: 2px solid var(--green);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--green);
  transition: width 0.3s;
}

.nav-links a:hover { color: var(--green); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: var(--green);
  color: var(--black);
  border: none;
  padding: 10px 24px;
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: none;
  transition: all 0.3s;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
}

.nav-cta:hover {
  background: var(--green-bright);
  transform: translateY(-2px);
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  padding: 120px 60px 60px;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(123,198,24,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123,198,24,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: grid-shift 20s linear infinite;
}

@keyframes grid-shift {
  0% { transform: translate(0,0); }
  100% { transform: translate(60px, 60px); }
}

.hero-content {
  max-width: 900px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--green-glow);
  padding: 8px 20px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--green);
  margin-bottom: 40px;
  animation: fadeDown 0.8s ease forwards;
  opacity: 0;
}

.badge-dot {
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.hero-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: clamp(56px, 10vw, 120px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -2px;
  margin-bottom: 16px;
  animation: fadeUp 0.9s ease 0.2s forwards;
  opacity: 0;
}

.title-icpc {
  color: var(--text);
  display: block;
}

.title-otu {
  color: var(--green);
  display: block;
  text-shadow: 0 0 60px rgba(123,198,24,0.4);
  position: relative;
}

.title-otu::after {
  content: 'CPC';
  position: absolute;
  left: 50%; transform: translateX(-50%);
  color: transparent;
  -webkit-text-stroke: 1px rgba(123,198,24,0.2);
  top: 6px;
}

.hero-edition {
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  color: var(--green);
  letter-spacing: 4px;
  margin-bottom: 32px;
  opacity: 0;
  animation: fadeUp 0.9s ease 0.3s forwards;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 56px;
  line-height: 1.7;
  font-family: 'Cairo', sans-serif;
  opacity: 0;
  animation: fadeUp 0.9s ease 0.4s forwards;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  opacity: 0;
  animation: fadeUp 0.9s ease 0.5s forwards;
}

.btn-primary {
  background: var(--green);
  color: var(--black);
  padding: 16px 40px;
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  border: none;
  cursor: none;
  clip-path: polygon(12px 0%, 100% 0%, calc(100% - 12px) 100%, 0% 100%);
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
}

.btn-primary:hover {
  background: var(--green-bright);
  transform: translateY(-3px);
  box-shadow: 0 20px 40px rgba(123,198,24,0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--green);
  padding: 15px 40px;
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  border: 1px solid var(--border);
  cursor: none;
  clip-path: polygon(12px 0%, 100% 0%, calc(100% - 12px) 100%, 0% 100%);
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
}

.btn-secondary:hover {
  border-color: var(--green);
  background: var(--green-glow);
  transform: translateY(-3px);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  animation: fadeIn 1s ease 1.2s forwards;
}

.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--green), transparent);
  animation: scroll-pulse 2s infinite;
}

.scroll-text {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 2px;
  writing-mode: vertical-rl;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* STATS BAR */
.stats-bar {
  position: relative;
  z-index: 1;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 40px 60px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 0 30px;
  border-right: 1px solid var(--border);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.stat-item:last-child { border-right: none; }
.stat-item.visible { opacity: 1; transform: translateY(0); }

.stat-num {
  font-family: 'Space Mono', monospace;
  font-size: 48px;
  font-weight: 700;
  color: var(--green);
  line-height: 1;
}

.stat-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ABOUT */
.section {
  position: relative;
  z-index: 1;
  padding: 120px 60px;
}

.section-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--green);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 30px;
  height: 1px;
  background: var(--green);
}

.section-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.section-title span { color: var(--green); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text p {
  font-family: 'Cairo', sans-serif;
  font-size: 17px;
  color: var(--text-dim);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-visual {
  position: relative;
}

.code-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 32px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  line-height: 1.8;
  position: relative;
  overflow: hidden;
}

.code-block::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--green), transparent);
}

.code-header {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.code-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.code-line { margin-bottom: 4px; }
.c-green { color: var(--green); }
.c-dim { color: var(--text-dim); }
.c-white { color: var(--text); }
.c-blue { color: #7eb8f7; }
.c-orange { color: #f0a070; }

.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 14px;
  background: var(--green);
  vertical-align: text-bottom;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* FEATURES */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin-top: 60px;
}

.feature-card {
  background: var(--card-bg);
  padding: 40px 36px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--green-glow);
  opacity: 0;
  transition: opacity 0.4s;
}

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

.feature-card:hover {
  border-color: rgba(123,198,24,0.5);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px; height: 48px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Mono', monospace;
  font-size: 20px;
  color: var(--green);
  margin-bottom: 24px;
  position: relative;
}

.feature-num {
  position: absolute;
  top: -8px; right: -8px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.feature-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

.feature-desc {
  font-family: 'Cairo', sans-serif;
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.7;
}

/* TIMELINE */
.timeline-section {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.timeline {
  position: relative;
  margin-top: 60px;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
  transform: translateX(-50%);
}

.timeline-line::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 0%;
  background: var(--green);
  transition: height 2s ease;
}

.timeline-line.animated::after { height: 100%; }

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  gap: 0;
  margin-bottom: 60px;
  align-items: center;
  opacity: 0;
  transition: opacity 0.6s ease;
}

.timeline-item.visible { opacity: 1; }

.timeline-content {
  background: var(--black);
  border: 1px solid var(--border);
  padding: 28px 32px;
  position: relative;
  transition: border-color 0.3s;
}

.timeline-content:hover { border-color: var(--green); }

.timeline-content.right { margin-left: 30px; }
.timeline-content.left { margin-right: 30px; text-align: right; }

.timeline-empty { }

.timeline-dot {
  width: 14px; height: 14px;
  background: var(--green);
  border-radius: 50%;
  margin: 0 auto;
  position: relative;
  box-shadow: 0 0 20px rgba(123,198,24,0.5);
}

.timeline-tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: var(--green);
  letter-spacing: 2px;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.timeline-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-desc {
  font-family: 'Cairo', sans-serif;
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* CTA SECTION */
.cta-section {
  position: relative;
  z-index: 1;
  padding: 120px 60px;
  text-align: center;
  overflow: hidden;
}

.cta-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 50%, rgba(123,198,24,0.08) 0%, transparent 70%);
}

.cta-title {
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -2px;
  margin-bottom: 32px;
  position: relative;
}

.cta-title span { color: var(--green); }

.cta-subtitle {
  font-family: 'Cairo', sans-serif;
  font-size: 18px;
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 56px;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
}

/* FOOTER */
.footer-bottom {
  position: relative;
  z-index: 1;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 24px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--text-dim);
}

.footer-copy span { color: var(--green); }

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Glitch effect for title */
.glitch {
  position: relative;
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  overflow: hidden;
  color: var(--green);
}

.glitch::before {
  animation: glitch1 4s infinite;
  clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%);
  transform: translateX(-3px);
}

.glitch::after {
  animation: glitch2 4s infinite;
  clip-path: polygon(0 65%, 100% 65%, 100% 100%, 0 100%);
  transform: translateX(3px);
  color: rgba(123,198,24,0.7);
}

@keyframes glitch1 {
  0%, 90%, 100% { transform: translateX(0); opacity: 0; }
  92% { transform: translateX(-4px); opacity: 0.8; }
  94% { transform: translateX(4px); opacity: 0.8; }
  96% { transform: translateX(0); opacity: 0; }
}

@keyframes glitch2 {
  0%, 91%, 100% { transform: translateX(0); opacity: 0; }
  93% { transform: translateX(4px); opacity: 0.8; }
  95% { transform: translateX(-4px); opacity: 0.8; }
  97% { transform: translateX(0); opacity: 0; }
}

/* counter */
.counter-num { display: inline-block; }

/* scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile */
@media (max-width: 900px) {
  nav { padding: 16px 24px; }
  .nav-links { display: none; }
  .hero { padding: 100px 24px 60px; }
  .section { padding: 80px 24px; }
  .stats-bar { grid-template-columns: repeat(2,1fr); padding: 40px 24px; }
  .stat-item:nth-child(2) { border-right: none; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .features-grid { grid-template-columns: 1fr; }
  .timeline-item { grid-template-columns: 1fr; }
  .timeline-line { display: none; }
  .timeline-content.right, .timeline-content.left { margin: 0 0 0 0; text-align: left; }
  .timeline-dot { display: none; }
  .footer-bottom { padding: 24px; flex-direction: column; gap: 12px; }
  .cta-section { padding: 80px 24px; }
  .hero-actions, .cta-actions { flex-direction: column; align-items: center; }
}