/* Personal site — secure AI / systems engineer tone
   Calm slate + teal signal. No purple glow, no card grid hero. */

:root {
  --bg: #0c1219;
  --bg-elev: #121a24;
  --ink: #e8eef4;
  --ink-muted: #9aabbc;
  --ink-faint: #6b7d90;
  --line: rgba(232, 238, 244, 0.1);
  --accent: #3dba9a;
  --accent-soft: rgba(61, 186, 154, 0.14);
  --accent-ink: #0a1f1a;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "Sora", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 44rem;
  --pad: clamp(1.25rem, 4vw, 2rem);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.65;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(61, 186, 154, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(70, 110, 160, 0.15), transparent 50%),
    linear-gradient(180deg, #0c1219 0%, #0e1620 45%, #0c1219 100%);
}

.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='64' height='64'%3E%3Cpath d='M64 0H0V64' fill='none' stroke='%23e8eef4' stroke-opacity='0.04' stroke-width='1'/%3E%3C/svg%3E");
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #6fd4b6;
}

.mono {
  font-family: var(--mono);
  font-size: 0.82em;
  letter-spacing: 0.02em;
}

.inline-flow {
  display: inline;
  color: var(--ink-muted);
}

.faint {
  color: var(--ink-faint);
}

/* Header */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.25rem var(--pad);
}

.mark {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 0.35rem 0.55rem;
  letter-spacing: 0.06em;
}

.mark:hover {
  color: var(--accent);
  border-color: rgba(61, 186, 154, 0.45);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.15rem;
  font-size: 0.88rem;
}

.nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

.nav a:hover {
  color: var(--ink);
}

/* Main */

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad) 4rem;
}

.hero {
  padding: clamp(2.25rem, 8vh, 3.75rem) 0 2.5rem;
  animation: rise 0.7s ease-out both;
}

.eyebrow {
  margin: 0 0 0.85rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 6vw, 3.35rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0 0 1.4rem;
  max-width: 34rem;
  color: var(--ink-muted);
  font-size: 1.08rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  background: #6fd4b6;
  color: var(--accent-ink);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: rgba(61, 186, 154, 0.5);
  color: var(--accent);
}

/* Sections */

.section {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
  animation: rise 0.7s ease-out both;
  animation-delay: 0.12s;
}

.section.project {
  padding-top: 3.25rem;
}

.result-line {
  margin: -0.35rem 0 1rem;
  padding: 0.65rem 0.85rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  letter-spacing: 0.01em;
  color: var(--accent);
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
}

.result-kicker {
  display: inline-block;
  margin-right: 0.55rem;
  padding: 0.08rem 0.4rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--accent);
}

.flow {
  margin: 0 0 1.5rem;
  padding: 1rem 1.1rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
}

.flow-track {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.45rem;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.flow-arrow {
  color: var(--ink-faint);
  font-family: var(--mono);
}

.flow-emphasis {
  color: var(--ink);
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  background: var(--accent-soft);
  border: 1px solid rgba(61, 186, 154, 0.35);
}

.flow-caption {
  display: block;
  margin-top: 0.75rem;
  color: var(--ink-faint);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.contact-primary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 1.15rem;
}

.contact-primary .btn {
  font-size: 0.88rem;
  word-break: break-all;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
  font-size: 0.8rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.section h2 {
  margin: 0 0 0.85rem;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 3.5vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.015em;
}

.section-intro {
  margin: 0 0 1.35rem;
  color: var(--ink-muted);
}

.section-intro strong {
  color: var(--ink);
  font-weight: 600;
}

.capability-list {
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.capability-list li {
  position: relative;
  padding: 0.45rem 0 0.45rem 1.15rem;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--line);
}

.capability-list li:last-child {
  border-bottom: none;
}

.capability-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  width: 0.4rem;
  height: 0.4rem;
  background: var(--accent);
  opacity: 0.85;
}

.link-row,
.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.link-row a,
.contact-row a {
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 186, 154, 0.35);
  padding-bottom: 0.1rem;
}

.link-row a:hover,
.contact-row a:hover {
  border-bottom-color: var(--accent);
}

/* Stack */

.stack-grid {
  display: grid;
  gap: 1.15rem 1.5rem;
  margin: 0;
}

.stack-grid > div {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.stack-grid dt {
  margin: 0 0 0.25rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.stack-grid dd {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.98rem;
}

.contact .section-intro {
  max-width: 32rem;
}

/* Footer */

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem var(--pad) 2.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.site-footer p {
  margin: 0;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(0.6rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero,
  .section {
    animation: none;
  }
}

@media (max-width: 560px) {
  .nav {
    justify-content: flex-end;
    font-size: 0.8rem;
    gap: 0.65rem 0.85rem;
  }

  .hero {
    padding-top: 2.25rem;
  }
}