:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c2a;
  --text-primary: #e8e8ed;
  --text-secondary: #8888a0;
  --text-muted: #555570;
  --accent-cyan: #00d4ff;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-pink: #ec4899;
  --border: #1e1e30;
  --border-glow: rgba(0, 212, 255, 0.15);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.08);
  --max-width: 960px;
  --nav-height: 64px;
  --radius: 12px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  padding-top: var(--nav-height);
  overflow-x: hidden;
}

/* ── Grid overlay ── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 20%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── Orb glow ── */
body::after {
  content: "";
  position: fixed;
  top: -30vh;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

::selection {
  background: rgba(0, 212, 255, 0.3);
  color: #fff;
}

/* ── Navbar ── */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.3px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 6px;
  align-items: center;
}

.nav-links > li > a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.88rem;
  padding: 8px 14px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}
.nav-links > li > a:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
}

/* ── Dropdown ── */
.dropdown {
  position: relative;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  min-width: 220px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 6px;
  z-index: 999;
}
.dropdown-content.show {
  display: block;
}
.dropdown-content a {
  display: block;
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
}
.dropdown-content a:hover {
  background: rgba(0, 212, 255, 0.08);
  color: var(--text-primary);
}

.nav-toggle {
  display: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.2s;
}
.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.04);
}

/* ── Hero ── */
#hero {
  padding: 100px 24px 80px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-container {
  max-width: 600px;
  margin: 0 auto;
}

.profile-pic {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 28px;
  border: 2px solid var(--border);
  background: var(--bg-secondary);
  position: relative;
}
.profile-pic::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
  z-index: -1;
  opacity: 0.6;
}
.profile-pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

#hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-family: "JetBrains Mono", "Fira Code", monospace;
}

.hero-title::before {
  content: "> ";
  color: var(--accent-cyan);
}

.hero-contacts {
  display: flex;
  justify-content: center;
  gap: 12px;
  font-size: 1.2rem;
}

.hero-contacts a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all 0.2s;
}
.hero-contacts a:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ── Hero extras (inline blocks) ── */
.hero-extras {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 0 24px 48px;
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-block {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: border-color 0.2s;
}
.hero-block:hover {
  border-color: rgba(0, 212, 255, 0.15);
}

.hero-block h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.hero-block h3 .hash {
  color: var(--accent-cyan);
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-weight: 400;
  opacity: 0.7;
  font-size: 0.95rem;
}

.hero-block ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hero-block li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
}
.hero-block li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 0.8rem;
  opacity: 0.7;
}
.hero-block li strong {
  color: var(--text-primary);
  font-weight: 600;
}

@media (max-width: 640px) {
  .hero-extras {
    flex-direction: column;
    align-items: center;
    padding: 0 24px 32px;
  }
  .hero-block {
    width: 100%;
    max-width: 100%;
  }
}

/* ── Terminal deco ── */
.terminal-bar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 8px 8px 0 0;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-bottom: none;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: "JetBrains Mono", "Fira Code", monospace;
  margin-bottom: -1px;
}
.terminal-bar .dots {
  display: flex;
  gap: 6px;
}
.terminal-bar .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.terminal-bar .dot:nth-child(1) { background: #ff5f56; }
.terminal-bar .dot:nth-child(2) { background: #ffbd2e; }
.terminal-bar .dot:nth-child(3) { background: #27c93f; }

/* ── Sections ── */
section {
  padding: 50px 24px;
  position: relative;
  z-index: 1;
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
}

section h2 .hash {
  color: var(--accent-cyan);
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-weight: 400;
  opacity: 0.7;
}

section h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

#about p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ── Projects ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 212, 255, 0.06);
  background: var(--bg-card-hover);
}

.project-img {
  width: 100%;
  height: 180px;
  background: var(--bg-secondary);
  overflow: hidden;
  position: relative;
}
.project-img::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  opacity: 0;
  transition: opacity 0.3s;
}
.project-card:hover .project-img::after {
  opacity: 1;
}
.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.project-card:hover .project-img img {
  transform: scale(1.05);
}

.project-info {
  padding: 20px;
}

.project-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.project-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Publications ── */
.publication-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pub-item {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  align-items: baseline;
  transition: border-color 0.2s;
}
.pub-item:hover {
  border-color: rgba(0, 212, 255, 0.15);
}

.pub-authors {
  width: 100%;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.pub-authors strong {
  color: var(--text-primary);
}

.pub-title {
  font-weight: 600;
  color: var(--text-primary);
}

.pub-venue {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pub-link {
  font-size: 0.8rem;
  font-weight: 500;
  margin-left: auto;
  padding: 2px 10px;
  border-radius: 4px;
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid rgba(0, 212, 255, 0.12);
  transition: background 0.2s, border-color 0.2s;
}
.pub-link:hover {
  background: rgba(0, 212, 255, 0.12);
  border-color: var(--accent-cyan);
}

/* ── Now / Blog ── */
#now {
  position: relative;
}

.now-content p {
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.now-content ul {
  margin: 16px 0 16px 20px;
}

.now-content li {
  margin-bottom: 8px;
  color: var(--text-secondary);
  position: relative;
  padding-left: 8px;
}
.now-content li::marker {
  color: var(--accent-cyan);
}

.now-updated {
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

footer a {
  color: var(--text-secondary);
}
footer a:hover {
  color: var(--accent-cyan);
}

/* ── Scroll reveal animation ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 12px 16px;
    gap: 4px;
    box-shadow: var(--shadow);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links > li > a {
    display: block;
    padding: 10px 12px;
  }
  .nav-toggle {
    display: block;
  }
  .dropdown-content {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0 0 0 16px;
  }
  .dropdown-content a {
    padding: 6px 12px;
  }
  #hero h1 {
    font-size: 1.9rem;
  }
  .profile-pic {
    width: 120px;
    height: 120px;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  #hero h1 {
    font-size: 1.6rem;
  }
  .profile-pic {
    width: 100px;
    height: 100px;
  }
}