:root {
  --bg: #0f0f0f;

  --surface: #141414;

  --text: #f3f3f3;

  --muted: #8b8b8b;

  --line: rgba(255, 255, 255, 0.06);

  /* Border variable */
  --border: 1px solid var(--line);
  /* border muted */
  --border-muted: 1px solid rgba(255, 255, 255, 0.12);
  /* border accent */
  --border-accent: 1px solid rgb(160, 160, 160);
  /* Border size scaled*/
  --border-base-size: 1px;
  --border-size-sm: calc(var(--border-base-size) * 0.75);
  --border-size-lg: calc(var(--border-base-size) * 1.5);

  --container: 980px;

  --container-gutter: 3rem;

  --transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);

  /*  */

  /*
    |--------------------------------------------------------------------------
    | Font Presets
    |--------------------------------------------------------------------------
    */

  --font-inter: "Inter", sans-serif;

  --font-plex: "IBM Plex Sans", sans-serif;

  --font-manrope: "Manrope", sans-serif;

  --font-mono: "IBM Plex Mono", monospace;

  /*
    |--------------------------------------------------------------------------
    | Active Font
    |--------------------------------------------------------------------------
    */

  --font-sans: var(--font-inter);
}

[data-theme="light"] {
  --bg: #f6f4ef;

  --surface: #fcfbf8;

  --text: #1f1d1a;

  --muted: #6f665a;

  --line: rgba(20, 18, 14, 0.12);
}

/*
|--------------------------------------------------------------------------
| Theme Font Modes
|--------------------------------------------------------------------------
*/

html[data-font="inter"] {
  --font-sans: var(--font-inter);
}

html[data-font="plex"] {
  --font-sans: var(--font-plex);
}

html[data-font="manrope"] {
  --font-sans: var(--font-manrope);
}

/*
|--------------------------------------------------------------------------
| Base
|--------------------------------------------------------------------------
*/

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;

  background: var(--bg);

  color: var(--text);

  font-family: var(--font-sans);

  text-rendering: optimizeLegibility;

  -webkit-font-smoothing: antialiased;
}

main {
  width: 100%;
}

.container {
  width: min(calc(100% - var(--container-gutter)), var(--container));

  margin-inline: auto;
}

/*
|--------------------------------------------------------------------------
| Sections
|--------------------------------------------------------------------------
*/

section {
  position: relative;

  padding-block: 9rem;
}

section::before {
  content: "";

  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);

  width: min(calc(100% - var(--container-gutter)), var(--container));
  border-top: 1px solid var(--line);
}

section:first-child::before {
  border-top: none;
}

/*
|--------------------------------------------------------------------------
| Typography
|--------------------------------------------------------------------------
*/

h1,
h2,
h3,
p,
ul {
  margin: 0;
}

h1 {
  font-size: clamp(4.5rem, 11vw, 10rem);

  line-height: 0.9;

  letter-spacing: -0.07em;

  font-weight: 700;

  max-width: 9ch;
}

h2 {
  margin-bottom: 3rem;

  font-size: clamp(1.5rem, 4vw, 2.2rem);

  letter-spacing: -0.05em;

  font-weight: 600;
}

h3 {
  margin-bottom: 1rem;

  font-size: 1.3rem;

  letter-spacing: -0.04em;

  font-weight: 600;
}

p {
  color: var(--muted);

  line-height: 1.8;

  max-width: 65ch;
}

ul {
  padding: 0;

  margin: 0;

  list-style: none;
}

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

.hero {
  min-height: 100svh;

  display: flex;
  align-items: center;

  padding-top: 4rem;
}

.hero-inner {
  display: flex;
  flex-direction: column;

  gap: 3rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;

  gap: 0.75rem;
}

.hero-tags span {
  color: var(--muted);

  font-size: 0.92rem;
}

.hero-tags span::after {
  content: "•";

  margin-left: 0.75rem;

  opacity: 0.4;
}

.hero-tags span:last-child::after {
  display: none;
}

.hero-credentials {
  display: flex;
  flex-direction: column;

  gap: 0.5rem;
}

.hero-credentials p {
  font-family: var(--font-mono);

  font-size: 0.82rem;
}

/*
|--------------------------------------------------------------------------
| Lists
|--------------------------------------------------------------------------
*/

.section-list {
  display: flex;
  flex-direction: column;

  gap: 1.2rem;
}

.section-list li {
  color: var(--muted);

  transition: var(--transition);

  letter-spacing: -0.02em;
}

.section-list li:hover {
  color: var(--text);

  transform: translateX(4px);
}

/*
|--------------------------------------------------------------------------
| Stack
|--------------------------------------------------------------------------
*/

.stack-groups {
  display: grid;

  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));

  gap: 3rem;
}

.stack-group h3 {
  font-size: 0.82rem;

  text-transform: uppercase;

  letter-spacing: 0.08em;

  color: var(--muted);
}

.stack-group ul {
  display: flex;
  flex-direction: column;

  gap: 0.9rem;
}

/*
|--------------------------------------------------------------------------
| Trajectory
|--------------------------------------------------------------------------
*/

.trajectory-list {
  display: flex;
  flex-direction: column;

  gap: 4rem;
}

.trajectory-period {
  display: inline-block;

  margin-bottom: 1rem;

  color: var(--muted);

  font-size: 0.8rem;

  text-transform: uppercase;

  letter-spacing: 0.08em;
}

/*
|--------------------------------------------------------------------------
| Links
|--------------------------------------------------------------------------
*/

.links-grid {
  display: flex;
  flex-wrap: wrap;

  gap: 2rem;
}

.link-item {
  color: var(--muted);

  transition: var(--transition);
}

.link-item:hover {
  color: var(--text);

  transform: translateX(3px);
}

/*
|--------------------------------------------------------------------------
| Theme Toggle
|--------------------------------------------------------------------------
*/

.theme-toggle {
  position: fixed;

  top: 2rem;
  right: 2rem;

  z-index: 1000;

  display: flex;

  gap: 0.5rem;
}

.theme-toggle button {
  border: none;

  background: transparent;

  color: var(--muted);

  cursor: pointer;

  font-size: 0.8rem;

  letter-spacing: 0.04em;

  transition: var(--transition);
}

.theme-toggle button:hover {
  color: var(--text);
}

/*
|--------------------------------------------------------------------------
| Reveal Motion
|--------------------------------------------------------------------------
*/

[data-reveal] {
  opacity: 0;

  transform: translateY(16px);

  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

[data-reveal].is-visible {
  opacity: 1;

  transform: translateY(0);
}

/*
|--------------------------------------------------------------------------
| Media Queries
|--------------------------------------------------------------------------
*/

@media (max-width: 900px) {
  section {
    padding-block: 7rem;
  }

  h1 {
    font-size: clamp(4rem, 14vw, 7rem);
  }

  .stack-groups {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --container-gutter: 2rem;
  }

  .container {
    width: min(calc(100% - var(--container-gutter)), var(--container));
  }

  section {
    padding-block: 5rem;
  }

  .hero {
    min-height: auto;

    padding-top: 8rem;
  }

  h1 {
    font-size: clamp(3rem, 18vw, 5rem);
  }

  .stack-groups {
    grid-template-columns: 1fr;
  }

  .links-grid {
    flex-direction: column;

    gap: 1rem;
  }

  .theme-toggle {
    top: 1rem;
    right: 1rem;
  }
}

/*
|--------------------------------------------------------------------------
| Projects / Labs
|--------------------------------------------------------------------------
*/

.project-group {
  margin-bottom: 5rem;
}

.group-title {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.project-card {
  border: 1px solid var(--line);
  padding: 1.5rem;

  display: flex;
  flex-direction: column;

  gap: 0.8rem;

  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.12);
}

.project-card h4 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

.project-card a {
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
}

/*
|--------------------------------------------------------------------------
| Theme Toggle
|--------------------------------------------------------------------------
*/

.theme-toggle {
  position: fixed;

  top: 2rem;
  right: 2rem;

  width: 34px;
  height: 34px;

  border-radius: 999px;

  border: 1px solid var(--line);

  background: transparent;

  color: var(--text);

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 12px;

  cursor: pointer;

  transition: var(--transition);
}

.theme-toggle:hover {
  transform: scale(1.05);
  border-color: var(--text);
}

@media (max-width: 640px) {
  .theme-toggle {
    top: 1rem;
    right: 1rem;
  }
}

/*
|--------------------------------------------------------------------------
| Nav Scroll Effect
|--------------------------------------------------------------------------
*/

.nav {
  position: fixed;

  bottom: 2rem;
  left: 2rem;

  display: flex;
  gap: 1.25rem;

  z-index: 1000;

  padding: 0.5rem 0.75rem;

  transition:
    background 0.2s ease,
    backdrop-filter 0.2s ease;
}

/* overlay state */
.nav.scrolled {
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);

  border: 1px solid var(--line);

  border-radius: 999px;
}

[data-theme="light"] .nav.scrolled {
  background: rgba(255, 255, 255, 0.6);
}

/*
|--------------------------------------------------------------------------
| Credentials Section
|--------------------------------------------------------------------------
*/

.section-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.section-list li {
  padding: 0.75rem 1rem;

  /* border: 1px solid var(--line); */

  font-size: var(--text-sm);

  color: var(--muted);

  transition: var(--transition);
}

.section-list li:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateX(2px);
}

/*
|--------------------------------------------------------------------------
| Field Experience Section
|--------------------------------------------------------------------------
*/

.section-list.field {
  display: grid;
  gap: 0.9rem;
}

.section-list.field li {
  border-left: 2px solid var(--line);
  padding-left: 1rem;

  color: var(--muted);

  font-size: var(--text-sm);
  line-height: var(--lh-relaxed);

  transition: var(--transition);
}

.section-list.field li:hover {
  color: var(--text);
  border-left-color: var(--text);
}

/*
|--------------------------------------------------------------------------
| Systems Foundation Section
|--------------------------------------------------------------------------
*/

.section-list {
  list-style: none;
  padding: 0;
  margin: 0;

  display: grid;
  gap: 0.75rem;
}

.section-list li {
  padding: 0.75rem 1rem;

  font-size: var(--text-sm);

  color: var(--muted);

  transition: var(--transition);
}

.section-list li:hover {
  color: var(--text);
  transform: translateX(2px);
}
.flow-list {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
}
.flow-list::before {
  content: "";
  position: absolute;
  left: 0.6rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.flow-list li {
  position: relative;

  padding-left: 1.5rem;
  margin-bottom: 0.75rem;

  color: var(--muted);

  font-size: var(--text-sm);
  line-height: var(--lh-relaxed);
}
.flow-list li::before {
  content: "";

  position: absolute;

  left: 0.45rem;
  top: 0.6rem;

  width: 6px;
  height: 6px;

  border-radius: 50%;

  background: var(--text);
  opacity: 0.35;
}
.section-list.foundation li {
  border: 1px solid var(--line);
  padding: 0.75rem 1rem;
}

.section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;

  color: rgba(255, 255, 255, 0.45);

  margin-bottom: 1rem;
}