:root {
  --bg: #0b0f16;
  --panel: #121826;
  --panel-border: #202838;
  --text: #edeff2;
  --text-muted: #8d97a8;
  --accent: #5eead4;
  --accent-dim: rgba(94, 234, 212, 0.14);
  --amber: #e8a659;
  --rail-w: 180px;
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #06110f;
  padding: 10px 16px;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.skip-link:focus { left: 12px; top: 12px; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Rail / nav ---------- */

.rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  padding: 28px 24px;
  border-right: 1px solid var(--panel-border);
  z-index: 50;
}

.mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  text-decoration: none;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.rail-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  transition: color 0.15s ease;
}

.rail-nav a:hover,
.rail-nav a:focus-visible { color: var(--accent); }

.rail-nav .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}
.rail-nav a:hover .dot,
.rail-nav a:focus-visible .dot { background: var(--accent); }

.rail-nav a.active { color: var(--accent); }
.rail-nav a.active .dot { background: var(--accent); }

.rail-bottom {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.rail-bottom a {
  color: var(--text-muted);
  display: block;
  transition: color 0.15s ease;
}
.rail-bottom a:hover,
.rail-bottom a:focus-visible { color: var(--accent); }

/* ---------- Main / layout ---------- */

main {
  margin-left: var(--rail-w);
  max-width: 760px;
  padding: 0 32px;
}

.section {
  padding: 96px 0 32px;
  border-top: 1px solid var(--panel-border);
}
.section:first-of-type { border-top: none; }

.section-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-transform: lowercase;
  margin: 0 0 40px;
}
.section-title::before { content: "// "; color: var(--text-muted); }

/* ---------- Hero ---------- */

.hero {
  padding: 120px 0 64px;
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0 0 18px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.02;
  margin: 0 0 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.hero-role {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  color: var(--text);
  font-weight: 500;
  max-width: 58ch;
  margin: 0 0 18px;
}

.hero-lede {
  color: var(--text-muted);
  max-width: 58ch;
  font-size: 1.02rem;
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 13px 22px;
  border-radius: 3px;
  text-decoration: none;
  display: inline-block;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #06110f;
}
.btn-primary:hover { background: #7ff2e4; }

.btn-ghost {
  border-color: var(--panel-border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-signal { width: 100%; max-width: 620px; }
.hero-signal svg { width: 100%; height: auto; display: block; }

.baseline { stroke: var(--panel-border); stroke-width: 1; }

#waveform-path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  animation: draw 4s ease-out infinite;
}

@keyframes draw {
  0% { stroke-dashoffset: 2000; }
  55% { stroke-dashoffset: 0; }
  85% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: 2000; }
}

/* ---------- Timeline ---------- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--panel-border);
}

.timeline-item {
  position: relative;
  padding: 0 0 48px 32px;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.t-date {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 6px;
}

.t-body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 0 4px;
}

.t-org {
  color: var(--accent);
  font-size: 0.92rem;
  margin: 0 0 12px;
}

.t-body ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-muted);
}
.t-body li { margin-bottom: 8px; }
.t-body li:last-child { margin-bottom: 0; }

/* ---------- Projects ---------- */

.project-grid {
  display: grid;
  gap: 20px;
}

.project-card {
  background: var(--panel);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 26px 28px;
}

.project-card h3 {
  font-family: var(--font-display);
  margin: 0 0 4px;
  font-size: 1.15rem;
}

.project-card p { color: var(--text-muted); margin: 0 0 14px; }
.project-card p:last-of-type { margin-bottom: 16px; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 5px 10px;
  border-radius: 3px;
}

/* ---------- Skills ---------- */

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 32px;
}

.skill-group h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin: 0 0 16px;
}

.cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--text);
  font-size: 0.95rem;
}
.cert-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.status {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 3px;
}
.status-done { background: var(--accent-dim); color: var(--accent); }
.status-progress { background: rgba(232, 166, 89, 0.14); color: var(--amber); }

.edu { color: var(--text-muted); margin: 0; }

/* ---------- Publications ---------- */

.pub-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 28px;
}

.pub-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 14px;
  line-height: 1.4;
}

.pub-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0 0 6px;
}

.pub-link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.pub-link:hover { border-bottom-color: var(--accent); }

/* ---------- Contact / footer ---------- */

.contact-lede {
  color: var(--text-muted);
  max-width: 52ch;
  margin: 0 0 32px;
}

.footer {
  padding: 40px 0 80px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 760px) {
  :root { --rail-w: 0px; }

  .rail {
    position: static;
    width: 100%;
    flex-direction: row;
    justify-content: space-between;
    padding: 16px 20px;
    border-right: none;
    border-bottom: 1px solid var(--panel-border);
  }

  .rail-nav {
    writing-mode: horizontal-tb;
    transform: none;
    flex-direction: row;
    gap: 18px;
  }

  .rail-nav a span.dot { display: none; }
  .rail-nav a { font-size: 0.68rem; }

  .rail-bottom { flex-direction: row; }

  main { margin-left: 0; padding: 0 20px; }

  .hero { min-height: auto; padding: 56px 0 48px; }

  .skills-grid { grid-template-columns: 1fr; }
}