:root {
  --color-primary: #0f172a;
  --color-on-primary: #ffffff;
  --color-secondary: #334155;
  --color-accent: #0369a1;
  --color-accent-hover: #075985;
  --color-on-accent: #ffffff;
  --color-background: #f8fafc;
  --color-foreground: #0f172a;
  --color-card: #ffffff;
  --color-muted: #eef2f7;
  --color-muted-foreground: #475569;
  --color-border: #e2e8f0;
  --color-ring: #0369a1;
  --color-success: #16a34a;

  --font-heading: "Space Grotesk", "Archivo", system-ui, sans-serif;
  --font-body: "Archivo", system-ui, -apple-system, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --container: 1160px;
  --header-h: 76px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, 0.18);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-base: 250ms;
}

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

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  margin: 0;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; padding: 0; }

a, button, input, textarea, summary {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -60px;
  left: var(--space-3);
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top var(--dur-base) var(--ease);
}
.skip-link:focus {
  top: var(--space-3);
}

main { display: block; }

section {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
}

.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.eyebrow.light { color: #7dd3fc; }

.section-heading, .section-intro {
  max-width: 640px;
  margin-bottom: var(--space-6);
}
.section-heading h2, .section-intro h2 {
  font-size: clamp(28px, 4vw, 40px);
}

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 13px 22px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.button svg { flex-shrink: 0; }
.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }

.button.primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.button.primary:hover { background: #1e293b; box-shadow: var(--shadow-md); }

.button.accent {
  background: var(--color-accent);
  color: var(--color-on-accent);
  box-shadow: var(--shadow-sm);
}
.button.accent:hover { background: var(--color-accent-hover); box-shadow: var(--shadow-md); }

.button.outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.button.outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: #f0f9ff;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 var(--space-4);
  max-width: var(--container);
  margin: 0 auto;
  background: color-mix(in srgb, var(--color-background) 88%, transparent);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-secondary);
  position: relative;
  padding: 6px 2px;
  transition: color var(--dur-base) var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--color-accent);
  transition: right var(--dur-base) var(--ease);
}
.nav-links a:hover { color: var(--color-primary); }
.nav-links a:hover::after { right: 0; }

.menu-button {
  display: none;
  width: 40px;
  height: 40px;
  place-items: center;
  cursor: pointer;
  color: var(--color-primary);
}
.icon-close { display: none; }
.menu-button[aria-expanded="true"] .icon-menu { display: none; }
.menu-button[aria-expanded="true"] .icon-close { display: block; }

.hero {
  padding-top: var(--space-7);
  padding-bottom: var(--space-8);
  position: relative;
}

.hero-number {
  position: absolute;
  top: var(--space-6);
  right: var(--space-4);
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--color-muted-foreground);
  letter-spacing: 0.1em;
}

.hero-copy h1 {
  font-size: clamp(38px, 6vw, 64px);
  margin: var(--space-2) 0 var(--space-4);
}
.hero-copy em { font-style: normal; color: var(--color-accent); }

.hero-intro {
  max-width: 520px;
  font-size: 18px;
  color: var(--color-secondary);
  margin-bottom: var(--space-5);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.hero-status {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}
.hero-status span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-secondary);
  background: var(--color-muted);
  padding: 8px 14px;
  border-radius: 999px;
}
.hero-status .available {
  color: var(--color-accent);
  background: #f0f9ff;
}
.hero-status .available i {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.25);
  flex-shrink: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}
.reveal.in-view { opacity: 1; transform: none; }
.reveal.delay { transition-delay: 120ms; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

.work-section { background: var(--color-card); border-radius: var(--radius-lg); }

.project {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: var(--space-7);
  align-items: center;
}

.project-visual {
  position: relative;
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  min-height: 340px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.sensor {
  position: absolute;
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #0f172a;
  background: #7dd3fc;
  padding: 6px 10px;
  border-radius: 999px;
}
.sensor.s1 { top: 14%; left: 12%; background: #fca5a5; }
.sensor.s2 { top: 10%; right: 14%; background: #fde68a; }
.sensor.s3 { bottom: 32%; left: 18%; background: #7dd3fc; }

.pi-board {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  text-align: center;
  backdrop-filter: blur(4px);
}
.pi-board small {
  display: block;
  color: #94a3b8;
  font-size: 10px;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.pi-board b {
  font-family: var(--font-heading);
  color: #fff;
  font-size: 20px;
}
.pi-board i {
  display: block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #4ade80;
  margin: 10px auto 0;
  box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.2);
}

.data-stream {
  position: absolute;
  bottom: 56px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
}
.data-stream span {
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: #38bdf8;
  opacity: 0.5;
}
.data-stream span:nth-child(2) { height: 28px; opacity: 0.7; }
.data-stream span:nth-child(3) { height: 14px; opacity: 0.4; }
.data-stream span:nth-child(4) { height: 24px; opacity: 0.65; }
.data-stream span:nth-child(5) { height: 20px; opacity: 0.5; }

.project-visual p {
  position: absolute;
  bottom: var(--space-3);
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  color: #64748b;
  letter-spacing: 0.06em;
}

.project-index {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.project-copy h3 {
  font-size: clamp(22px, 3vw, 28px);
  margin-bottom: var(--space-3);
}
.project-copy > p { color: var(--color-secondary); margin-bottom: var(--space-4); max-width: 480px; }

.project-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.project-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--color-foreground);
  font-size: 15px;
}
.project-points svg { color: var(--color-accent); margin-top: 3px; flex-shrink: 0; }

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.project-meta span {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-secondary);
  background: var(--color-muted);
  padding: 6px 12px;
  border-radius: 999px;
}

.background-section {
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-lg);
  margin-top: var(--space-6);
}
.background-section h2 { color: #fff; }

.timeline {
  display: grid;
  gap: var(--space-4);
}
.timeline article {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.timeline article:first-child { border-top: none; }
.timeline span {
  font-family: var(--font-heading);
  font-size: 13px;
  color: #7dd3fc;
  font-weight: 600;
}
.timeline h3 { color: #fff; font-size: 19px; margin-bottom: 4px; }
.timeline .place { color: #94a3b8; font-size: 14px; margin-bottom: 8px; font-weight: 500; }
.timeline article > p:last-child { color: #cbd5e1; max-width: 560px; }

.skill-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}
.skill-grid article {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--dur-base) var(--ease), transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}
.skill-grid article:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.skill-grid span {
  display: block;
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-3);
}
.skill-grid h3 { font-size: 17px; margin-bottom: var(--space-3); }
.skill-grid li {
  font-size: 14.5px;
  color: var(--color-secondary);
  padding: 6px 0;
  border-top: 1px solid var(--color-border);
}
.skill-grid li:first-child { border-top: none; padding-top: 0; }

.proof-section .eyebrow, .proof-section h2 { text-align: left; }
.proof-section h2 { margin-bottom: var(--space-6); font-size: clamp(26px, 4vw, 34px); }

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.proof-grid article {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.proof-grid span {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background: #f0f9ff;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: var(--space-3);
}
.proof-grid h3 { font-size: 17px; margin-bottom: var(--space-2); }
.proof-grid p { color: var(--color-secondary); font-size: 14.5px; }

.contact-section { max-width: 560px; }
.contact-copy .eyebrow { color: var(--color-accent); }
.contact-copy h2 { color: var(--color-primary); font-size: clamp(28px, 4vw, 38px); margin-bottom: var(--space-3); }
.contact-copy > p { color: var(--color-secondary); max-width: 440px; margin-bottom: var(--space-5); }

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.contact-details a,
.contact-details span {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  color: var(--color-foreground);
}
.contact-details svg { color: var(--color-accent); flex-shrink: 0; }
.contact-details a { transition: color var(--dur-base) var(--ease); }
.contact-details a:hover { color: var(--color-accent); }

footer {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-7);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted-foreground);
  font-size: 13.5px;
}
footer .brand { margin-right: auto; }

@media (max-width: 1024px) {
  .project { grid-template-columns: 1fr; }
  .project-visual { min-height: 280px; }
  .skill-grid { grid-template-columns: repeat(2, 1fr); }
  .proof-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }
  section { padding: var(--space-6) var(--space-3); }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease), visibility var(--dur-base);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav-links a { padding: 14px var(--space-2); border-bottom: 1px solid var(--color-border); font-size: 16px; }
  .nav-links a::after { display: none; }
  .nav-links a:last-child { border-bottom: none; }
  .menu-button { display: grid; }

  .hero-number { display: none; }
  .hero { padding-top: var(--space-5); }
  .skill-grid { grid-template-columns: 1fr; }
  .proof-grid { grid-template-columns: 1fr; }
  .timeline article { grid-template-columns: 1fr; gap: var(--space-2); }
  footer { flex-direction: column; align-items: flex-start; }
  footer .brand { margin-right: 0; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .button { justify-content: center; }
}