/* ===== CSS VARIABLES ===== */
:root {
  --bg: #0a0a0f;
  --bg-2: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1e1e2a;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(99,102,241,0.4);
  --accent: #6366f1;
  --accent-2: #22d3ee;
  --accent-glow: rgba(99,102,241,0.15);
  --text: #e2e2ef;
  --text-muted: #7b7b9a;
  --text-dim: #4a4a6a;
  --white: #ffffff;
  --radius: 16px;
  --radius-sm: 8px;
  --font-display: 'Syne', sans-serif;
  --font-mono: 'Space Mono', monospace;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET ===== */
*, *::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-display);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { height: 0px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ===== NAV ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.nav.scrolled { box-shadow: 0 4px 32px rgba(0,0,0,0.5); }
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  border: 2px solid var(--accent);
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px;
  transition: var(--transition);
}
.nav-logo:hover { background: var(--accent); color: white; }
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  font-size: 0.9rem; font-weight: 600; letter-spacing: 0.05em;
  color: var(--text-muted);
  position: relative; transition: var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--accent); transform: scaleX(0);
  transition: var(--transition); transform-origin: left;
}
.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { transform: scaleX(1); }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--text); border-radius: 2px; transition: var(--transition);
}
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 1rem 2rem;
  gap: 0.75rem;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--text-muted); font-size: 1rem; font-weight: 600;
  padding: 0.5rem 0; border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.mobile-nav a:hover { color: var(--accent); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  padding: 7rem 2rem 4rem;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
}
.blob {
  position: absolute; border-radius: 50%;
  filter: blur(80px); opacity: 0.18; animation: blobFloat 8s ease-in-out infinite;
}
.blob-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #6366f1, #8b5cf6);
  top: -100px; left: -100px;
  animation-delay: 0s;
}
.blob-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #22d3ee, #6366f1);
  bottom: -80px; right: -80px;
  animation-delay: 3s;
}
@keyframes blobFloat {
  0%, 100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(30px,-20px) scale(1.05); }
  66% { transform: translate(-20px,15px) scale(0.97); }
}
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(99,102,241,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero-content {
  position: relative; z-index: 1;
  text-align: center; max-width: 720px; margin: 0 auto;
}
.badge {
  display: inline-block;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.3);
  color: var(--accent);
  font-family: var(--font-mono); font-size: 0.8rem;
  padding: 0.4rem 1.1rem; border-radius: 999px;
  margin-bottom: 1.5rem; letter-spacing: 0.05em;
  animation: fadeUp 0.6s ease both;
}
.hero-title {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 800; line-height: 1; letter-spacing: -0.03em;
  color: var(--white);
  animation: fadeUp 0.6s 0.1s ease both;
}
.hero-title .accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  margin: 1.5rem auto 2.5rem;
  font-size: 1.1rem; color: var(--text-muted); max-width: 520px;
  line-height: 1.8;
  animation: fadeUp 0.6s 0.2s ease both;
}
.hero-sub strong { color: var(--text); }
.hero-stats {
  display: flex; gap: 2.5rem; justify-content: center;
  margin-bottom: 2.5rem;
  animation: fadeUp 0.6s 0.3s ease both;
}
.stat { text-align: center; }
.stat-num {
  display: block; font-family: var(--font-mono);
  font-size: 2.2rem; font-weight: 700;
  color: var(--accent);
}
.stat-label {
  font-size: 0.8rem; color: var(--text-muted);
  letter-spacing: 0.08em; text-transform: uppercase;
}
.hero-cta {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
  animation: fadeUp 0.6s 0.4s ease both;
}
.scroll-hint {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  color: var(--text-dim); font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.15em; text-transform: uppercase;
  animation: fadeUp 0.6s 0.8s ease both;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 700;
  border-radius: var(--radius-sm); border: none; cursor: pointer;
  transition: var(--transition); letter-spacing: 0.04em;
}
.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 24px rgba(99,102,241,0.3);
}
.btn-primary:hover {
  background: #818cf8;
  box-shadow: 0 0 40px rgba(99,102,241,0.5);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.mt-1 { margin-top: 1rem; }

/* ===== SECTIONS ===== */
.section { padding: 6rem 2rem; }
.section-dark { background: var(--bg-2); }
.container { max-width: 1100px; margin: 0 auto; }
.section-tag {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--accent); letter-spacing: 0.15em; text-transform: uppercase;
  margin-bottom: 1rem;
}
.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800; color: var(--white);
  margin-bottom: 1.5rem; letter-spacing: -0.02em; line-height: 1.1;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem;
  align-items: start;
}
.about-text p {
  color: var(--text-muted); margin-bottom: 1rem; font-size: 1.05rem;
}
.about-text strong { color: var(--text); }
.about-cards { display: flex; flex-direction: column; gap: 1rem; }
.mini-card {
  display: flex; align-items: flex-start; gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 1.2rem;
  transition: var(--transition);
}
.mini-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateX(6px);
}
.mini-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: 2px; }
.mini-card strong { display: block; color: var(--white); font-size: 0.95rem; margin-bottom: 0.25rem; }
.mini-card p { color: var(--text-muted); font-size: 0.88rem; margin: 0; line-height: 1.5; }

/* ===== TOPICS ===== */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem; margin-top: 1rem;
}
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  transition: var(--transition);
  position: relative; overflow: hidden;
  cursor: default;
}
.topic-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--accent-glow), transparent);
  opacity: 0; transition: var(--transition);
  pointer-events: none;
}
.topic-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(0,0,0,0.4), 0 0 0 1px rgba(99,102,241,0.1);
}
.topic-card:hover::before { opacity: 1; }
.topic-icon { font-size: 2.2rem; margin-bottom: 1rem; display: block; }
.topic-card h3 {
  font-size: 1.3rem; font-weight: 800; color: var(--white);
  margin-bottom: 0.75rem;
}
.topic-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.25rem; line-height: 1.6; }
.topic-link {
  font-family: var(--font-mono); font-size: 0.82rem; font-weight: 700;
  color: var(--accent); letter-spacing: 0.05em;
  transition: var(--transition);
}
a.topic-link:hover { color: var(--accent-2); }
.topic-link.inactive { color: var(--text-dim); cursor: default; }
.topic-tags {
  margin-top: 1.25rem; display: flex; flex-wrap: wrap; gap: 0.5rem;
}
.topic-tags span {
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.2);
  color: var(--accent);
  font-family: var(--font-mono); font-size: 0.72rem;
  padding: 0.25rem 0.65rem; border-radius: 999px; letter-spacing: 0.04em;
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem; margin-top: 1rem;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  position: relative; transition: var(--transition);
  display: flex; flex-direction: column;
}
.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4);
}
.project-card.featured {
  border-color: rgba(99,102,241,0.35);
  background: linear-gradient(135deg, rgba(99,102,241,0.06), var(--bg-card));
}
.project-num {
  font-family: var(--font-mono); font-size: 0.75rem;
  color: var(--text-dim); letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
.project-badge {
  display: inline-flex; align-items: center;
  background: rgba(34,211,238,0.1); border: 1px solid rgba(34,211,238,0.25);
  color: var(--accent-2);
  font-size: 0.75rem; font-weight: 700;
  padding: 0.3rem 0.75rem; border-radius: 999px;
  margin-bottom: 1rem; width: fit-content;
}
.project-badge.upcoming {
  background: rgba(99,102,241,0.1); border-color: rgba(99,102,241,0.2);
  color: var(--accent);
}
.project-card h3 {
  font-size: 1.25rem; font-weight: 800; color: var(--white);
  margin-bottom: 0.75rem;
}
.project-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; flex: 1; }
.project-stack {
  display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.25rem 0 1rem;
}
.project-stack span {
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono); font-size: 0.72rem;
  padding: 0.25rem 0.65rem; border-radius: 6px;
}
.project-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.project-links a {
  font-family: var(--font-mono); font-size: 0.8rem; font-weight: 700;
  color: var(--accent); transition: var(--transition); letter-spacing: 0.03em;
}
.project-links a:hover { color: var(--accent-2); }
.inactive-link {
  font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--text-dim);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center; gap: 1rem;
  text-align: center;
}
.footer-logo {
  font-family: var(--font-mono); font-size: 1.2rem; font-weight: 700;
  color: var(--accent); border: 2px solid var(--accent);
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px;
}
.footer-tagline { color: var(--text-muted); font-size: 0.9rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: center; }
.footer-links a {
  color: var(--text-muted); font-size: 0.88rem; font-weight: 600;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent); }
.footer-copy { color: var(--text-dim); font-size: 0.82rem; font-family: var(--font-mono); }

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1; transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { overflow: scroll-X; gap: 1.5rem; list-style: none;
  display: flex;
  gap: 0.5rem;
  overflow-x: scroll;
  white-space: nowrap;}
  /* .hero { padding: 6rem 1.5rem 3rem; }
  .hero-stats { gap: 1.5rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .topics-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .section { padding: 4rem 1.5rem; }
  .hero-cta { flex-direction: column; align-items: center; } */
}
@media (max-width: 480px) {
  .hero-stats { flex-wrap: wrap; gap: 1rem; }
  .stat-num { font-size: 1.8rem; }
}