/* ==========================================================================
   NuIIX portfolio — design tokens, base, components.
   Zero dependencies: system font stacks, no external requests.
   ========================================================================== */

:root {
  color-scheme: dark;
  --bg: #0d1117;
  --bg-elevated: #161b22;
  --bg-subtle: #1b2230;
  --border: #30363d;
  --border-strong: #3d444d;
  --text: #e6edf3;
  --text-muted: #9198a1;
  --accent: #2f81f7;
  --accent-soft: rgb(47 129 247 / 14%);
  --accent-text: #58a6ff;
  --success: #3fb950;
  --success-soft: rgb(63 185 80 / 14%);
  --violet: #a371f7;
  --warning: #d29922;
  --hero-glow: rgb(47 129 247 / 22%);
  --shadow: 0 8px 28px rgb(1 4 9 / 45%);

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Fira Code", SFMono-Regular,
    Menlo, Consolas, "Liberation Mono", monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 5rem;
  --radius: 12px;
  --radius-sm: 8px;
  --content: 68rem;
  --header-h: 3.75rem;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #ffffff;
  --bg-elevated: #f6f8fa;
  --bg-subtle: #eef2f7;
  --border: #d1d9e0;
  --border-strong: #b8c2cc;
  --text: #1f2328;
  --text-muted: #59636e;
  --accent: #0969da;
  --accent-soft: rgb(9 105 218 / 10%);
  --accent-text: #0550ae;
  --success: #1a7f37;
  --success-soft: rgb(26 127 55 / 12%);
  --violet: #8250df;
  --warning: #9a6700;
  --hero-glow: rgb(9 105 218 / 14%);
  --shadow: 0 8px 24px rgb(31 35 40 / 12%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent-text);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

code,
.mono {
  font-family: var(--font-mono);
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -4rem;
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: var(--space-3);
  text-decoration: none;
}

.container {
  width: min(100% - 2.5rem, var(--content));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-8);
}

.section--alt {
  background: var(--bg-elevated);
  border-block: 1px solid var(--border);
}

.section__head {
  margin-bottom: var(--space-6);
  max-width: 44rem;
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-text);
}

.section__title {
  font-size: clamp(1.6rem, 3.2vw, 2.15rem);
}

.section__lead {
  margin-top: var(--space-3);
  color: var(--text-muted);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand__dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 4px var(--success-soft);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.nav__link:hover,
.nav__link[aria-current="true"] {
  color: var(--text);
  background: var(--bg-subtle);
  text-decoration: none;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-group {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.icon-btn,
.lang-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.25rem;
  min-width: 2.25rem;
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}

.icon-btn:hover,
.lang-link:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
  text-decoration: none;
}

.icon-btn svg {
  width: 1.1rem;
  height: 1.1rem;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

.nav-toggle {
  display: none;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3.5rem, 9vw, 6.5rem) var(--space-8);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto;
  height: 80%;
  background: radial-gradient(60% 60% at 50% 0%, var(--hero-glow), transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.hero__inner > * {
  max-width: 50rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  width: fit-content;
  padding: var(--space-1) var(--space-4);
  border: 1px solid color-mix(in srgb, var(--success) 40%, var(--border));
  border-radius: 999px;
  background: var(--success-soft);
  color: var(--success);
  font-size: 0.875rem;
  font-weight: 600;
}

.status-pill__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: currentcolor;
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.45;
    transform: scale(0.8);
  }
}

.hero__title {
  font-size: clamp(2.6rem, 8vw, 4.75rem);
  letter-spacing: -0.04em;
}

.hero__title .gradient {
  background: linear-gradient(100deg, var(--accent-text), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__role {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--accent-text);
}

.hero__role .cursor {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  margin-left: 0.15em;
  vertical-align: text-bottom;
  background: var(--accent-text);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.hero__lead {
  max-width: 42rem;
  font-size: clamp(1.0625rem, 2vw, 1.2rem);
  color: var(--text-muted);
}

.hero__lead strong {
  color: var(--text);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.7rem 1.2rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  font-weight: 600;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
  border-color: var(--accent);
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--accent) 88%, #fff);
}

.btn svg {
  width: 1.1rem;
  height: 1.1rem;
}

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding: 0;
  list-style: none;
}

.facts__item {
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-elevated) 85%, transparent);
}

.facts__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.facts__value {
  display: block;
  margin-top: var(--space-1);
  font-weight: 600;
}

/* ---------- Cards / grids ---------- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.section--alt .card {
  background: var(--bg);
}

.card:hover {
  border-color: var(--border-strong);
}

.card__title {
  font-size: 1.15rem;
}

.card__text {
  color: var(--text-muted);
  font-size: 0.97rem;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: var(--space-6);
  align-items: start;
}

.about-text {
  display: grid;
  gap: var(--space-4);
  color: var(--text-muted);
}

.about-text strong {
  color: var(--text);
}

.dl {
  margin: 0;
  display: grid;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
}

.dl__row {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
}

.dl__row + .dl__row {
  border-top: 1px solid var(--border);
}

.dl dt {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.dl dd {
  margin: 0;
}

/* ---------- Tags ---------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag {
  padding: 0.15rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.tag--accent {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: var(--accent-soft);
  color: var(--accent-text);
}

/* ---------- Featured projects ---------- */
.projects {
  display: grid;
  gap: var(--space-5);
}

.project {
  display: grid;
  gap: var(--space-5);
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  background: var(--bg-elevated);
}

.project__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
}

.project__title {
  font-size: clamp(1.35rem, 2.6vw, 1.7rem);
}

.project__kicker {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.project__lead {
  max-width: 52rem;
  color: var(--text-muted);
}

.cases {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.case {
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.case__label {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent-text);
}

.case p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.case p + p {
  margin-top: var(--space-2);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.metric {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.metric__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.metric__label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.note {
  padding: var(--space-4) var(--space-5);
  border: 1px solid color-mix(in srgb, var(--warning) 45%, var(--border));
  border-left-width: 4px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--warning) 9%, transparent);
  font-size: 0.95rem;
  color: var(--text-muted);
}

.note strong {
  color: var(--text);
}

.project__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  display: grid;
  gap: var(--space-5);
  margin: 0;
  padding: 0 0 0 var(--space-6);
  list-style: none;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.45rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: linear-gradient(var(--accent), var(--violet));
  opacity: 0.55;
}

.timeline__item {
  position: relative;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-6) + 0.1rem);
  top: 0.4rem;
  width: 0.8rem;
  height: 0.8rem;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--bg);
}

.timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-text);
}

.timeline__title {
  margin-top: var(--space-1);
  font-size: 1.1rem;
}

.timeline__text {
  margin-top: var(--space-1);
  color: var(--text-muted);
}

/* ---------- Stack ---------- */
.stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: var(--space-4);
}

.stack__group {
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}

.stack__title {
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ---------- Repo table ---------- */
.repo-list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.repo {
  display: grid;
  grid-template-columns: minmax(0, 15rem) minmax(0, 1fr) auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}

.repo:hover {
  border-color: var(--border-strong);
}

.repo__name {
  font-family: var(--font-mono);
  font-weight: 600;
  overflow-wrap: anywhere;
}

.repo__desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---------- Contact ---------- */
.contact {
  display: grid;
  gap: var(--space-5);
  justify-items: start;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(135deg, var(--accent-soft), transparent 60%), var(--bg-elevated);
}

.contact__title {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
}

.contact__text {
  max-width: 40rem;
  color: var(--text-muted);
}

/* ---------- Footer ---------- */
.site-footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

/* ---------- 404 ---------- */
.not-found {
  display: grid;
  place-items: center;
  min-height: calc(100vh - var(--header-h) - 6rem);
  text-align: center;
}

.not-found__code {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 18vw, 9rem);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(100deg, var(--accent-text), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Scroll reveal (progressive enhancement) ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 62rem) {
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 52rem) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) 1.25rem var(--space-4);
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }

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

  .nav__link {
    padding: var(--space-3);
  }

  .cases,
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .repo {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .dl__row {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .section {
    padding-block: var(--space-7);
  }
}

@media (max-width: 26rem) {
  .btn-row .btn {
    width: 100%;
    justify-content: center;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  .site-header,
  .skip-link,
  .btn-row,
  .nav-toggle {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }
}