:root {
  --bg: #f3f6fb;
  --bg-soft: #e8eff9;
  --glass: rgba(255, 255, 255, 0.5);
  --glass-strong: rgba(255, 255, 255, 0.64);
  --glass-border: rgba(255, 255, 255, 0.32);
  --glass-highlight: rgba(255, 255, 255, 0.3);
  --glass-panel-shadow: rgba(10, 24, 46, 0.08);
  --ink: #0b1b33;
  --ink-soft: #304a6e;
  --muted: #5f7697;
  --line: #c7d7eb;
  --accent: #00d66f;
  --accent-2: #00ff84;
  --accent-glow: rgba(0, 214, 111, 0.24);
  --shadow: 0 20px 52px rgba(10, 24, 46, 0.1);
  --radius: 16px;
  --nav-h: 72px;
  --max-w: 1120px;
  --grid-minor: rgba(12, 27, 51, 0.03);
  --grid-major: rgba(12, 27, 51, 0.06);
  --ruler: rgba(12, 27, 51, 0.1);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #030504;
  --bg-soft: #090d0a;
  --glass: rgba(15, 20, 17, 0.52);
  --glass-strong: rgba(15, 20, 17, 0.66);
  --glass-border: rgba(243, 255, 247, 0.12);
  --glass-highlight: rgba(243, 255, 247, 0.06);
  --glass-panel-shadow: rgba(0, 0, 0, 0.18);
  --ink: #f3fff7;
  --ink-soft: #bdd7c6;
  --muted: #84a38f;
  --line: #2a3d31;
  --accent: #00d66f;
  --accent-2: #00ff84;
  --accent-glow: rgba(0, 255, 132, 0.32);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --grid-minor: rgba(183, 220, 198, 0.035);
  --grid-major: rgba(183, 220, 198, 0.07);
  --ruler: rgba(183, 220, 198, 0.11);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: "Space Grotesk", "Avenir Next", sans-serif;
  background: radial-gradient(1200px 700px at 90% -10%, rgba(0, 255, 132, 0.08), transparent 65%),
    radial-gradient(900px 600px at -15% 15%, rgba(0, 214, 111, 0.09), transparent 68%),
    linear-gradient(180deg, var(--bg-soft) 0%, var(--bg) 28%, var(--bg) 100%);
  color: var(--ink);
  line-height: 1.62;
  overflow-x: hidden;
  transition: background 0.35s ease, color 0.2s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

section[id] {
  scroll-margin-top: calc(var(--nav-h) + 14px);
}

.math-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.3;
  background-image:
    linear-gradient(var(--grid-minor) 0.7px, transparent 0.7px),
    linear-gradient(90deg, var(--grid-minor) 0.7px, transparent 0.7px),
    linear-gradient(var(--grid-major) 0.7px, transparent 0.7px),
    linear-gradient(90deg, var(--grid-major) 0.7px, transparent 0.7px);
  background-size: 18px 18px, 18px 18px, 90px 90px, 90px 90px;
}

.math-grid::before {
  content: "";
  position: absolute;
  pointer-events: none;
  left: 0;
  right: 0;
  top: 0;
  height: 18px;
  border-bottom: 1px solid var(--ruler);
  background:
    repeating-linear-gradient(
      to right,
      var(--ruler) 0,
      var(--ruler) 1px,
      transparent 1px,
      transparent 9px
    ),
    repeating-linear-gradient(
      to right,
      color-mix(in srgb, var(--ruler) 90%, transparent) 0,
      color-mix(in srgb, var(--ruler) 90%, transparent) 1px,
      transparent 1px,
      transparent 45px
    );
}

main {
  position: relative;
  z-index: 2;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  height: var(--nav-h);
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1.4rem;
  background: var(--glass-strong);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
}

.brand {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.28rem;
  flex-wrap: wrap;
}

.site-nav a {
  font-size: 0.83rem;
  color: var(--muted);
  padding: 0.35rem 0.62rem;
  border-radius: 7px;
  border: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--ink);
  border-color: var(--glass-border);
  background: color-mix(in srgb, var(--glass) 88%, transparent);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--glass-border);
  color: var(--ink-soft);
  background: var(--glass);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
  backdrop-filter: blur(16px) saturate(1.25);
  -webkit-backdrop-filter: blur(16px) saturate(1.25);
  border-radius: 6px;
  padding: 0.34rem 0.68rem;
  cursor: pointer;
}

.section {
  width: min(var(--max-w), 100% - 2.5rem);
  margin: 0 auto;
  padding: 6rem 0;
}

.hero {
  min-height: 100vh;
  padding-top: calc(var(--nav-h) + 3.4rem);
  display: grid;
  grid-template-columns: minmax(220px, 360px) 1fr;
  gap: 2.3rem;
  align-items: center;
}

.hero-media {
  width: min(100%, 320px);
  justify-self: center;
}

.hero-media img {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  margin: 0 auto;
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 0.7rem;
}

.headline {
  max-width: 56ch;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.8;
  text-align: justify;
  text-align-last: left;
  margin-bottom: 1.2rem;
}

.links-panel {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.icon-link,
.hero-contact,
.stack-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  background: color-mix(in srgb, var(--glass) 76%, transparent);
  border: 1px solid color-mix(in srgb, var(--glass-border) 78%, transparent);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--glass-highlight) 52%, transparent);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    color 0.16s ease,
    box-shadow 0.16s ease,
    background-color 0.16s ease;
}

.icon-link {
  width: 2.9rem;
  height: 2.9rem;
  border-radius: 999px;
  font-size: 1.05rem;
}

.links-panel i {
  display: block;
  line-height: 1;
}

.links-divider {
  color: color-mix(in srgb, var(--muted) 82%, transparent);
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 1rem;
}

.hero-contact,
.stack-chip {
  min-height: 2.9rem;
  padding: 0 1rem;
  border-radius: 999px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stack-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
}

.stack-grid li {
  min-width: 0;
}

.stack-chip {
  width: 100%;
  cursor: default;
  user-select: none;
}

.icon-link:hover,
.hero-contact:hover {
  transform: translateY(-1px);
  color: var(--accent-2);
  border-color: color-mix(in srgb, var(--accent) 36%, var(--glass-border));
  background: color-mix(in srgb, var(--glass) 82%, transparent);
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--accent) 10%, transparent),
    0 8px 18px color-mix(in srgb, var(--accent-glow) 42%, transparent),
    inset 0 1px 0 color-mix(in srgb, var(--glass-highlight) 56%, transparent);
}

.stack-chip:hover {
  color: var(--accent-2);
  border-color: color-mix(in srgb, var(--accent) 32%, var(--glass-border));
  background: color-mix(in srgb, var(--glass) 82%, transparent);
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--accent) 9%, transparent),
    0 8px 18px color-mix(in srgb, var(--accent-glow) 30%, transparent),
    inset 0 1px 0 color-mix(in srgb, var(--glass-highlight) 56%, transparent);
}

.icon-link:focus-visible,
.hero-contact:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 52%, white);
  outline-offset: 3px;
}

.panel {
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 0.95rem;
  margin-bottom: 1.8rem;
  flex-wrap: wrap;
}

.section-num {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  letter-spacing: -0.02em;
}

.lead {
  max-width: 68ch;
  color: var(--ink-soft);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.section-timeline {
  --timeline-indent: 1.9rem;
  --timeline-axis: 9px;
  --timeline-dot-size: 12px;
  --timeline-dot-half: 6px;
  --timeline-dot-offset: 0.28rem;
  --timeline-line-width: 2px;
  position: relative;
  display: grid;
  gap: 1.35rem;
  padding-left: var(--timeline-indent);
}

.section-timeline::before {
  content: "";
  position: absolute;
  top: calc(var(--timeline-dot-offset) + var(--timeline-dot-half));
  bottom: calc(var(--timeline-dot-offset) + var(--timeline-dot-half));
  left: var(--timeline-axis);
  width: var(--timeline-line-width);
  transform: translateX(-50%);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 36%, transparent) 0%,
    color-mix(in srgb, var(--glass-border) 85%, transparent) 100%
  );
}

.card,
.contact-link {
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--glass-border) 78%, transparent);
  border-radius: var(--radius);
  background: #0b0f0b;
  box-shadow:
    0 12px 30px var(--glass-panel-shadow),
    inset 0 1px 0 color-mix(in srgb, var(--glass-highlight) 58%, transparent);
  backdrop-filter: blur(16px) saturate(0.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
}

.card {
  padding: 1rem;
}

.card h3 {
  font-size: 1.02rem;
  margin-bottom: 0.25rem;
}

.meta {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.67rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.45rem;
}

.card p {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.card a {
  display: inline-block;
  margin-top: 0.62rem;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

.timeline-entry {
  position: relative;
  padding: 0 0 0 1.15rem;
}

.timeline-entry::before {
  content: "";
  position: absolute;
  top: var(--timeline-dot-offset);
  left: calc(var(--timeline-axis) - var(--timeline-indent));
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  border-radius: 50%;
  transform: translateX(-50%);
  border: 2px solid color-mix(in srgb, var(--accent) 52%, transparent);
  background: #0b0f0b;
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent-glow) 22%, transparent);
}

.timeline-entry h3 {
  font-size: 1.02rem;
  line-height: 1.35;
  margin-bottom: 0.2rem;
}

.timeline-entry p {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.timeline-entry .meta {
  margin-bottom: 0.35rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1.1rem;
  padding: 0.7rem 0.95rem;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.2rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  position: relative;
  z-index: 2;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 1.7rem;
  }

  .hero-media {
    max-width: 260px;
    width: min(100%, 260px);
  }

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

  .stack-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  :root {
    --nav-h: 58px;
  }

  .site-header {
    padding: 0 1rem;
  }

  .nav-toggle {
    display: inline-flex;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    font-size: 0;
    line-height: 1;
  }

  .nav-toggle::before {
    content: "☰";
    color: var(--ink-soft);
    font-size: 1rem;
  }

  .site-header.is-open .nav-toggle::before {
    content: "✕";
    font-size: 0.92rem;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--nav-h);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
    padding: 0.65rem 1rem 0.8rem;
    background: var(--glass-strong);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(18px) saturate(1.3);
    -webkit-backdrop-filter: blur(18px) saturate(1.3);
  }

  .site-header.is-open .site-nav {
    display: flex;
  }

  .site-nav a {
    width: 100%;
    padding: 0.48rem 0.2rem;
  }

  .section {
    width: min(var(--max-w), 100% - 1.4rem);
    padding: 4.7rem 0;
  }

  .section-timeline {
    --timeline-indent: 1.5rem;
    --timeline-axis: 8px;
    gap: 1.15rem;
  }

  .stack-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .hero {
    min-height: 88vh;
    padding-top: calc(var(--nav-h) + 2.2rem);
  }

  .hero h1 {
    font-size: clamp(1.7rem, 9vw, 2.45rem);
  }
}

@media (max-width: 640px) {
  .brand {
    max-width: 62vw;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .section {
    width: min(var(--max-w), 100% - 1.1rem);
    padding: 4rem 0;
  }

  .hero {
    gap: 1.35rem;
    min-height: auto;
  }

  .hero-media {
    width: min(100%, 198px);
  }

  .eyebrow {
    margin-bottom: 0.75rem;
    text-align: center;
  }

  .hero h1 {
    text-align: center;
  }

  .headline {
    font-size: 0.96rem;
    line-height: 1.72;
    margin-inline: auto;
    text-align: justify;
    text-align-last: left;
  }

  .links-panel {
    justify-content: center;
    gap: 0.55rem;
  }

  .icon-link {
    width: 2.6rem;
    height: 2.6rem;
    font-size: 0.98rem;
  }

  .hero-contact {
    min-height: 2.6rem;
    padding: 0 0.9rem;
    font-size: 0.72rem;
    margin-inline: auto;
  }

  .links-divider {
    display: none;
  }

  .card {
    padding: 0.9rem;
  }

  .card-grid {
    gap: 0.7rem;
  }

  .stack-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.55rem;
  }

  .stack-chip {
    min-height: 2.6rem;
    padding: 0 0.75rem;
    font-size: 0.7rem;
  }

  .section-timeline {
    --timeline-indent: 1.25rem;
    --timeline-axis: 7px;
    --timeline-dot-size: 10px;
    --timeline-dot-half: 5px;
    gap: 1rem;
  }

  .timeline-entry {
    padding-left: 0.9rem;
  }

  .timeline-entry h3 {
    font-size: 0.98rem;
  }

  .timeline-entry p,
  .card p,
  .lead {
    text-align: justify;
    text-align-last: left;
  }

  .timeline-entry p,
  .card p {
    font-size: 0.9rem;
  }

  .contact-link {
    width: 100%;
    margin-top: 0.9rem;
    justify-content: center;
    text-align: center;
  }

  .site-footer {
    font-size: 0.64rem;
  }
}