@import url('https://fonts.googleapis.com/css2?family=Golos+Text:wght@400;450;500;550;600;650&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  color-scheme: dark;
  --bg: #080c0f; --surface: #101619; --text: #f1f4f1;
  --muted: #9ba6a9; --quiet: #839197; --accent: #b6f3cd;
  --accent-ink: #10281c; --line: #ffffff16; --header: #080c0fcc;
  --glow: #1a493426; --max: 1160px;
  --sans: 'Golos Text', Arial, sans-serif;
  --mono: 'IBM Plex Mono', Consolas, monospace;
}
:root[data-theme=light] {
  color-scheme: light;
  --bg: #f3f5f1; --surface: #e9eeea; --text: #17241e;
  --muted: #50625a; --quiet: #5b6f65; --accent: #286947;
  --accent-ink: #f5fff8; --line: #17362524; --header: #f3f5f1db;
  --glow: #75a98026;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 112px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; touch-action: manipulation; }
a, button { -webkit-tap-highlight-color: transparent; transition: color .25s, background .25s, border-color .25s; }
h1, h2, h3, p { margin: 0; }
svg { display: block; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
::selection { background: var(--accent); color: var(--bg); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
.section-shell, .nav-shell { width: min(calc(100% - 96px), var(--max)); margin-inline: auto; }
.accent { color: var(--accent); }
.space-backdrop { position: fixed; inset: 0; pointer-events: none; background: radial-gradient(ellipse at 84% 20%, var(--glow), transparent 45%); z-index: -1; }
.skip-link { position: fixed; left: 20px; top: -100px; padding: 10px 20px; background: var(--accent); color: var(--bg); z-index: 100; }
.skip-link:focus { top: 10px; }

/* The fixed header stays available while the page content moves. */
.site-header { position: fixed; inset: 0 0 auto; z-index: 30; background: var(--header); backdrop-filter: blur(22px); border-bottom: 1px solid var(--line); }
.nav-shell { min-height: 78px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 1.18rem; font-weight: 550; letter-spacing: -.04em; }
.brand-mark { color: var(--accent); font: 500 1.4rem var(--mono); letter-spacing: -.09em; }
.main-nav { display: flex; gap: 28px; margin-left: auto; margin-right: 24px; }
.main-nav a { font-size: .875rem; color: var(--muted); }
.main-nav a:hover, .main-nav a.active { color: var(--text); }
.nav-controls { display: flex; align-items: center; gap: 22px; margin-left: auto; }
.main-nav + .nav-controls { margin-left: 0; }
.language-switch { display: flex; align-items: center; gap: 4px; font: .875rem var(--mono); }
.language-switch > span { color: var(--quiet); }
.language-switch button { padding: 12px 5px; background: transparent; color: var(--quiet); font: inherit; }
.language-switch button[aria-pressed=true] { color: var(--text); }
.theme-switch { position: relative; display: flex; align-items: center; justify-content: space-between; width: 65px; height: 34px; padding: 7px; background: var(--surface); border: 1px solid var(--line); border-radius: 30px; }
.theme-switch svg { width: 17px; height: 17px; z-index: 2; transition: color .3s, transform .5s; }
.theme-switch .moon-icon { color: var(--accent-ink); }
.switch-thumb { position: absolute; top: 3px; right: 3px; width: 26px; height: 26px; border-radius: 50%; background: var(--accent); transition: transform .45s cubic-bezier(.2,.8,.2,1), background .45s; }
.theme-switch[aria-checked=true] .switch-thumb { transform: translateX(-30px); }
.theme-switch[aria-checked=true] .sun-icon { color: var(--accent-ink); transform: rotate(90deg); }
.theme-switch[aria-checked=true] .moon-icon { color: var(--quiet); }

.hero { position: relative; min-height: clamp(650px, 88svh, 820px); display: flex; align-items: center; padding-block: 150px 105px; isolation: isolate; }
.hero-copy { position: relative; z-index: 3; width: 55%; pointer-events: none; }
.hero-copy a { pointer-events: auto; }
h1 { font-size: clamp(3.6rem, 6.7vw, 5.7rem); font-weight: 500; line-height: 1.12; letter-spacing: -.06em; }
h1 > span { display: block; }
h1 .name-line { display: flex; align-items: baseline; white-space: nowrap; }
.typing-caret { display: inline-block; flex: 0 0 .027em; width: .027em; height: .79em; background: var(--accent); margin-left: .09em; align-self: center; transform: translateY(.015em); animation: caret-blink 1.15s step-end infinite; }
@keyframes caret-blink { 0%, 46%, 100% { opacity: 1; } 47%, 99% { opacity: 0; } }
.hero-description { max-width: 390px; color: var(--muted); font-size: 1rem; line-height: 1.85; margin-top: 25px; }
.hero-links { display: flex; flex-wrap: wrap; align-items: center; gap: 28px; margin-top: 29px; }
.button { display: inline-flex; align-items: center; gap: 9px; min-height: 44px; font-size: .875rem; font-weight: 450; border-bottom: 1px solid var(--line); }
.button:hover { color: var(--accent); border-color: var(--accent); }
.button svg { width: 18px; height: 18px; stroke: none; }
.external-arrow { color: var(--quiet); font-size: 1.05rem; margin-left: 3px; }
.hf-icon { font-size: 1.06rem; }
.galaxy-stage { position: fixed; z-index: 0; inset: 78px 0 0; pointer-events: none; }
.galaxy-stage canvas { width: 100%; height: 100%; display: block; pointer-events: auto; touch-action: pan-y; }
.galaxy-vignette { position: absolute; inset: 0; background: linear-gradient(90deg, var(--bg), transparent 48%); opacity: .7; pointer-events: none; }

/* Spacious personal sections with just the information that matters. */
.content-section { position: relative; border-top: 1px solid var(--line); padding-block: 78px 86px; }
h2 { font-size: 1.3rem; font-weight: 500; letter-spacing: -.03em; line-height: 1.45; }
.about-section { display: grid; grid-template-columns: 1fr 2.5fr; gap: 64px; }
.large-copy { max-width: 780px; font-size: clamp(1.3rem, 2.1vw, 1.75rem); line-height: 1.65; letter-spacing: -.025em; }
.profile-facts { position: relative; display: flex; gap: 85px; padding-bottom: 74px; }
.location { display: flex; align-items: center; gap: 14px; }
.location svg { width: 23px; height: 26px; color: var(--accent); }
.location > div { display: grid; gap: 6px; }
.fact-label { display: block; font-size: .75rem; color: var(--quiet); }
#spoken-list { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 6px; }
.spoken-row { display: flex; align-items: baseline; gap: 10px; font-size: .9375rem; }
.spoken-level { color: var(--quiet); font-size: .8125rem; }
.skills-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 32px; }
.skill-card { --card-accent: #92b6ff; position: relative; overflow: hidden; display: flex; flex-direction: column; justify-content: space-between; gap: 16px; min-height: 185px; padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: color-mix(in srgb, var(--surface) 72%, transparent); backdrop-filter: blur(14px); transition: transform .35s cubic-bezier(.2,.8,.2,1), border-color .35s, box-shadow .35s, background .35s; }
.skill-card.violet { --card-accent: #bbacff; }
.skill-card.yellow { --card-accent: #e9cc83; }
.skill-card.cyan { --card-accent: #7dcee2; }
.skill-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--card-accent) 55%, transparent); box-shadow: 0 14px 32px -10px color-mix(in srgb, var(--card-accent) 26%, transparent), 0 0 0 1px color-mix(in srgb, var(--card-accent) 20%, transparent); background: radial-gradient(circle at 85% 15%, color-mix(in srgb, var(--card-accent) 12%, transparent), transparent 70%), color-mix(in srgb, var(--surface) 80%, transparent); }
.skill-header { display: flex; align-items: center; justify-content: space-between; width: 100%; gap: 12px; }
.skill-icon-wrap { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 13px; background: color-mix(in srgb, var(--card-accent) 12%, transparent); border: 1px solid color-mix(in srgb, var(--card-accent) 22%, transparent); color: var(--card-accent); transition: transform .35s, background-color .35s, box-shadow .35s; }
.skill-card:hover .skill-icon-wrap { transform: scale(1.08); background: color-mix(in srgb, var(--card-accent) 22%, transparent); box-shadow: 0 0 18px color-mix(in srgb, var(--card-accent) 32%, transparent); }
.skill-icon-svg { width: 30px; height: 30px; display: block; }
.skill-mark { font: 500 1rem var(--mono); }
.skill-ext { font: 500 .75rem var(--mono); padding: 4px 9px; border-radius: 20px; background: color-mix(in srgb, var(--surface) 90%, transparent); border: 1px solid var(--line); color: var(--muted); letter-spacing: .02em; transition: border-color .3s, color .3s; }
.skill-card:hover .skill-ext { border-color: color-mix(in srgb, var(--card-accent) 45%, transparent); color: var(--card-accent); }
.skill-code-preview { font: 450 .82rem var(--mono); color: var(--card-accent); opacity: .3; padding-block: 2px; letter-spacing: .02em; user-select: none; pointer-events: none; transition: opacity .35s, transform .35s; }
.skill-card:hover .skill-code-preview { opacity: .72; transform: translateX(3px); }
.skill-footer { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.skill-title-row { display: flex; align-items: center; gap: 9px; }
.skill-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--card-accent); box-shadow: 0 0 8px var(--card-accent); flex-shrink: 0; transition: transform .3s; }
.skill-card:hover .skill-dot { transform: scale(1.3); }
.skill-name { font-size: 1.05rem; font-weight: 550; letter-spacing: -.02em; margin: 0; white-space: normal; word-break: break-word; }
.skill-bar { height: 2px; width: 100%; border-radius: 2px; background: linear-gradient(90deg, color-mix(in srgb, var(--card-accent) 30%, transparent), transparent); transition: background .35s, transform .35s; }
.skill-card:hover .skill-bar { background: linear-gradient(90deg, var(--card-accent), color-mix(in srgb, var(--card-accent) 15%, transparent)); transform: scaleX(1.02); transform-origin: left; }
:root[data-theme=light] .skill-card { --card-accent: #355bb2; }
:root[data-theme=light] .skill-card.violet { --card-accent: #7050b7; }
:root[data-theme=light] .skill-card.yellow { --card-accent: #85610c; }
:root[data-theme=light] .skill-card.cyan { --card-accent: #287188; }
:root[data-theme=light] .skill-code-preview { opacity: .45; }
:root[data-theme=light] .skill-card:hover .skill-code-preview { opacity: .85; }
.next-section { min-height: clamp(450px, 65svh, 620px); }
.learning-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 32px; }
.learning-card { --card-accent: var(--accent); position: relative; overflow: hidden; display: flex; flex-direction: column; justify-content: space-between; gap: 16px; min-height: 185px; padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: color-mix(in srgb, var(--surface) 72%, transparent); backdrop-filter: blur(14px); transition: transform .35s cubic-bezier(.2,.8,.2,1), border-color .35s, box-shadow .35s, background .35s; }
.learning-card.amber { --card-accent: #f0db4f; }
.learning-card.teal { --card-accent: #00add8; }
.learning-card.blue { --card-accent: #659ad2; }
.learning-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--card-accent) 55%, transparent); box-shadow: 0 14px 32px -10px color-mix(in srgb, var(--card-accent) 26%, transparent), 0 0 0 1px color-mix(in srgb, var(--card-accent) 20%, transparent); background: radial-gradient(circle at 85% 15%, color-mix(in srgb, var(--card-accent) 12%, transparent), transparent 70%), color-mix(in srgb, var(--surface) 80%, transparent); }
.learning-header { display: flex; align-items: center; justify-content: space-between; width: 100%; gap: 12px; }
.learning-icon-wrap { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 13px; background: color-mix(in srgb, var(--card-accent) 12%, transparent); border: 1px solid color-mix(in srgb, var(--card-accent) 22%, transparent); color: var(--card-accent); transition: transform .35s, background-color .35s, box-shadow .35s; }
.learning-card:hover .learning-icon-wrap { transform: scale(1.08); background: color-mix(in srgb, var(--card-accent) 22%, transparent); box-shadow: 0 0 18px color-mix(in srgb, var(--card-accent) 32%, transparent); }
.learning-mark { font: 500 1rem var(--mono); }
.learning-ext { font: 500 .75rem var(--mono); padding: 4px 9px; border-radius: 20px; background: color-mix(in srgb, var(--surface) 90%, transparent); border: 1px solid var(--line); color: var(--muted); letter-spacing: .02em; transition: border-color .3s, color .3s; }
.learning-card:hover .learning-ext { border-color: color-mix(in srgb, var(--card-accent) 45%, transparent); color: var(--card-accent); }
.learning-code-preview { font: 450 .82rem var(--mono); color: var(--card-accent); opacity: .3; padding-block: 2px; letter-spacing: .02em; user-select: none; pointer-events: none; transition: opacity .35s, transform .35s; }
.learning-card:hover .learning-code-preview { opacity: .72; transform: translateX(3px); }
.learning-footer { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.learning-title-row { display: flex; align-items: center; gap: 9px; }
.learning-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--card-accent); box-shadow: 0 0 8px var(--card-accent); flex-shrink: 0; transition: transform .3s; }
.learning-card:hover .learning-dot { transform: scale(1.3); }
.learning-name { font-size: 1.05rem; font-weight: 550; letter-spacing: -.02em; margin: 0; white-space: normal; word-break: break-word; }
.learning-bar { height: 2px; width: 100%; border-radius: 2px; background: linear-gradient(90deg, color-mix(in srgb, var(--card-accent) 30%, transparent), transparent); transition: background .35s, transform .35s; }
.learning-card:hover .learning-bar { background: linear-gradient(90deg, var(--card-accent), color-mix(in srgb, var(--card-accent) 15%, transparent)); transform: scaleX(1.02); transform-origin: left; }
:root[data-theme=light] .learning-card.amber { --card-accent: #8c7700; }
:root[data-theme=light] .learning-card.teal { --card-accent: #007d9c; }
:root[data-theme=light] .learning-card.blue { --card-accent: #2b5b84; }
:root[data-theme=light] .learning-code-preview { opacity: .45; }
:root[data-theme=light] .learning-card:hover .learning-code-preview { opacity: .85; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.section-link { color: var(--muted); font-size: .8125rem; }
.section-link:hover { color: var(--accent); }
.activity-card { margin-top: 32px; padding: 25px; border: 1px solid var(--line); border-radius: 16px; min-height: 230px; }
.activity-status { color: var(--muted); font-size: .875rem; }
.activity-status:empty { display: none; }
.activity-status:not(:empty) + #activity-calendar:not([hidden]) { margin-top: 18px; }
.activity-summary { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; font-size: .875rem; }
.activity-updated { color: var(--quiet); font-size: .75rem; }
.calendar-scroll { overflow-x: auto; padding: 6px 0 8px; scrollbar-width: thin; }
.contribution-chart { width: max-content; margin-inline: auto; position: relative; --cell: 10px; --gap: 3px; }
.calendar-months { display: grid; grid-auto-columns: 13px; grid-auto-flow: column; padding-left: 33px; height: 24px; font: 12px Arial, sans-serif; color: var(--muted); }
.calendar-body { display: flex; gap: 8px; }
.calendar-days { display: grid; grid-template-rows: repeat(7, 10px); row-gap: 3px; width: 25px; font: 11px/10px Arial, sans-serif; color: var(--muted); }
.calendar-grid { display: grid; grid-template-rows: repeat(7, var(--cell)); grid-auto-flow: column; grid-auto-columns: var(--cell); gap: var(--gap); }
.contribution-cell { display: block; width: 10px; height: 10px; padding: 0; border-radius: 2px; background: var(--level-0); outline: 1px solid #ffffff06; outline-offset: -1px; }
.contribution-cell[data-level="1"] { background: var(--level-1); }
.contribution-cell[data-level="2"] { background: var(--level-2); }
.contribution-cell[data-level="3"] { background: var(--level-3); }
.contribution-cell[data-level="4"] { background: var(--level-4); }
.contribution-cell:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
.calendar-spacer { width: 10px; height: 10px; }
.activity-card { --level-0: #161b22; --level-1: #0e4429; --level-2: #006d32; --level-3: #26a641; --level-4: #39d353; }
:root[data-theme=light] .activity-card { --level-0: #ebedf0; --level-1: #9be9a8; --level-2: #40c463; --level-3: #30a14e; --level-4: #216e39; }
.calendar-footer { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 10px; color: var(--quiet); font: 12px Arial, sans-serif; }
.calendar-range { font-size: 11px; }
.calendar-legend { display: flex; align-items: center; gap: 4px; }
.calendar-legend > span:first-child { margin-right: 4px; }
.calendar-legend > span:last-child { margin-left: 4px; }
.calendar-tooltip { position: fixed; z-index: 50; pointer-events: none; padding: 8px 11px; border-radius: 7px; background: var(--text); color: var(--bg); box-shadow: 0 3px 14px #0002; font-size: .75rem; max-width: calc(100vw - 24px); }
.retry-button { margin-top: 15px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 7px 14px; font-size: .8125rem; }
[hidden] { display: none !important; }
.site-footer { position: relative; display: flex; justify-content: space-between; align-items: center; gap: 20px; min-height: 140px; border-top: 1px solid var(--line); font-size: .8125rem; color: var(--quiet); }
.back-top { display: flex; align-items: center; gap: 10px; padding-block: 10px; }
.back-top:hover { color: var(--accent); }
.noscript-note { padding: 20px; color: var(--muted); text-align: center; }

/* Visibility is enhanced only after JS starts. Layout and keyboard access stay intact. */
.reveal-ready [data-reveal] { opacity: 0; transform: translate3d(0, var(--reveal-y, 16px), 0); transition: opacity .5s ease, transform .65s cubic-bezier(.22,1,.36,1); transition-delay: 0ms; }
.reveal-ready [data-reveal=fade] { transform: none; transition-duration: .9s; }
.reveal-ready [data-reveal].is-visible { opacity: 1; transform: none; transition-delay: var(--reveal-delay, 0ms); }
.reveal-ready [data-reveal]:focus-within { opacity: 1; transform: none; transition: none; }

@media (max-width: 1050px) {
  .section-shell, .nav-shell { width: calc(100% - 64px); }
  .main-nav { gap: 23px; margin-right: 10px; }
  .hero { min-height: 660px; }
  .about-section { gap: 40px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 100px; }
  .section-shell, .nav-shell { width: calc(100% - 40px); }
  .nav-shell { min-height: 72px; gap: 12px; }
  .brand { font-size: 1.1rem; }
  .main-nav { display: none; }
  .main-nav + .nav-controls { margin-left: auto; }
  .nav-controls { gap: 14px; }
  .language-switch { gap: 2px; }
  .theme-switch { width: 60px; height: 32px; padding: 6px; }
  .switch-thumb { width: 24px; height: 24px; }
  .theme-switch[aria-checked=true] .switch-thumb { transform: translateX(-26px); }
  .hero { display: block; min-height: 760px; padding-block: 142px 350px; }
  .hero-copy { width: 100%; }
  h1 { font-size: clamp(2.7rem, 12vw, 4.3rem); }
  .hero-description { max-width: 380px; margin-top: 22px; }
  .hero-links { gap: 25px; margin-top: 20px; }
  .galaxy-stage { inset: 72px 0 0; }
  .galaxy-vignette { background: linear-gradient(180deg, var(--bg), transparent 65%); opacity: .75; }
  .content-section { padding-block: 48px 54px; }
  .about-section { grid-template-columns: 1fr; gap: 24px; }
  .large-copy { font-size: 1.3rem; }
  .profile-facts { flex-direction: column; gap: 25px; padding-bottom: 45px; }
  #spoken-list { gap: 18px; }
  .skills-grid { grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
  .skill-card { padding: 20px; min-height: 156px; }
  .next-section { min-height: 580px; }
  .learning-list { grid-template-columns: 1fr 1fr; margin-top: 24px; gap: 12px; }
  .learning-card { padding: 20px; min-height: 156px; }
  .learning-card:first-child { grid-column: 1 / -1; }
  .section-heading h2 { font-size: 1.15rem; }
  .activity-card { padding: 18px 15px; margin-top: 24px; }
  .activity-summary { font-size: .8125rem; }
  .site-footer { min-height: 110px; }
}
@media (max-width: 370px) {
  .section-shell, .nav-shell { width: calc(100% - 32px); }
  .nav-controls { gap: 8px; }
  .hero-links { gap: 19px; }
  .button { font-size: .8125rem; }
  .spoken-row { font-size: .875rem; }
  .spoken-level { font-size: .8125rem; }
}

/* Theme switch animation: circular reveal using View Transitions API */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}
::view-transition-old(root) {
  z-index: 1;
}
::view-transition-new(root) {
  z-index: 9999;
  animation: theme-reveal .65s cubic-bezier(.65, 0, .35, 1);
}
@keyframes theme-reveal {
  from {
    clip-path: circle(0 at var(--tx) var(--ty));
  }
  to {
    clip-path: circle(var(--tr) at var(--tx) var(--ty));
  }
}
.theme-anim,
.theme-anim * {
  transition: background-color .45s, color .45s, border-color .45s !important;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .reveal-ready [data-reveal] { opacity: 1; transform: none; }
  .typing-caret { opacity: .75; }
}