/* ==========================================================================
   Prateek Mishra · Portfolio
   Design system: "Org Console" (editorial typography + developer-tool UI)
   --------------------------------------------------------------------------
   1. Tokens          6. Impact ledger      11. Contact
   2. Base            7. Expertise          12. Footer
   3. Layout          8. Experience         13. Palette / toast
   4. Components      9. Highlights         14. Motion
   5. Header & hero  10. Credentials        15. Responsive
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------- */
:root {
  /* type */
  --font-sans: "Inter Tight", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Instrument Serif", ui-serif, Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: clamp(1.15rem, 1rem + 0.5vw, 1.35rem);
  --fs-xl: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  --fs-2xl: clamp(2.1rem, 1.4rem + 3vw, 3.75rem);
  --fs-hero: clamp(3rem, 1.6rem + 6.4vw, 6.75rem);

  /* spacing (4px scale) */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px;
  --sp-9: 96px; --sp-10: 128px;
  --section-pad: clamp(88px, 6rem + 5vw, 168px);
  --gutter: clamp(16px, 4vw, 40px);
  --maxw: 1240px;

  /* shape & motion */
  --r-sm: 8px; --r-md: 12px; --r-lg: 18px; --r-xl: 26px;
  --ease: cubic-bezier(.2, .7, .1, 1);
  --ease-spring: cubic-bezier(.34, 1.4, .5, 1);
  --dur: 320ms;
  --header-h: 68px;
}

/* Dark (default) */
:root,
:root[data-theme="dark"] {
  --bg: #0a0d12;
  --bg-2: #0d1118;
  --surface: #11161f;
  --surface-2: #161c27;
  --line: rgba(214, 226, 255, 0.08);
  --line-2: rgba(214, 226, 255, 0.14);
  --text: #eceae4;
  --text-2: #a9b0bd;
  --text-3: #727b8c;
  --accent: #7cc4ff;
  --accent-2: #3d9bff;
  --accent-ink: #061423;
  --accent-soft: rgba(124, 196, 255, 0.12);
  --signal: #f5b544;
  --signal-soft: rgba(245, 181, 68, 0.12);
  --good: #6ee7b7;
  --shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.7), 0 0 0 1px var(--line);
  --grid-dot: rgba(214, 226, 255, 0.07);
  --code-k: #c792ea; --code-t: #7cc4ff; --code-f: #f5b544; --code-n: #6ee7b7; --code-c: #5d6778;
  color-scheme: dark;
}

/* Light */
:root[data-theme="light"] {
  --bg: #f4f2ed;
  --bg-2: #eeebe4;
  --surface: #ffffff;
  --surface-2: #f8f7f3;
  --line: rgba(16, 22, 34, 0.09);
  --line-2: rgba(16, 22, 34, 0.16);
  --text: #0e131b;
  --text-2: #4a5262;
  --text-3: #6f7686;
  --accent: #0b63ce;
  --accent-2: #0a55b0;
  --accent-ink: #ffffff;
  --accent-soft: rgba(11, 99, 206, 0.08);
  --signal: #a8620a;
  --signal-soft: rgba(168, 98, 10, 0.09);
  --good: #0f8a5f;
  --shadow: 0 30px 70px -35px rgba(20, 30, 50, 0.35), 0 0 0 1px var(--line);
  --grid-dot: rgba(16, 22, 34, 0.08);
  --code-k: #8a3ffc; --code-t: #0b63ce; --code-f: #a8620a; --code-n: #0f8a5f; --code-c: #8a92a2;
  color-scheme: light;
}

/* 2. Base ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
em { font-style: normal; }
::selection { background: var(--accent); color: var(--accent-ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.mono { font-family: var(--font-mono); font-size: var(--fs-xs); letter-spacing: 0.02em; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
.skip-link {
  position: fixed; left: 16px; top: -60px; z-index: 200;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: var(--r-sm); font-weight: 600;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }
.noscript {
  position: fixed; inset: auto 16px 16px 16px; z-index: 300;
  padding: 14px 18px; border-radius: var(--r-md);
  background: var(--surface-2); border: 1px solid var(--line-2); color: var(--text);
}
.noscript a { color: var(--accent); text-decoration: underline; }

/* 3. Layout ---------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: calc(var(--maxw) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { position: relative; padding-block: var(--section-pad); }
.section + .section { border-top: 1px solid var(--line); }

.section-head { display: grid; gap: var(--sp-4); margin-bottom: clamp(40px, 6vw, 80px); max-width: 760px; }
.section-head--split {
  max-width: none;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  align-items: end;
  gap: var(--sp-6) var(--sp-8);
}
.section-head__aside { display: grid; gap: var(--sp-5); justify-items: start; }
.section-index {
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 10px;
  text-transform: uppercase; letter-spacing: 0.14em;
}
.section-index::before { content: ""; width: 22px; height: 1px; background: currentColor; opacity: .7; }
.section-title {
  font-size: var(--fs-2xl);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
.section-title em, .contact__title em, .hero__headline em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text-2);
}
.section-lede { color: var(--text-2); font-size: var(--fs-md); max-width: 56ch; text-wrap: pretty; }
.footnote { color: var(--text-3); line-height: 1.6; }

/* 4. Components ------------------------------------------------------------ */
.btn {
  --btn-bg: transparent;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 50px; padding: 0 22px;
  border-radius: 999px;
  font-weight: 600; font-size: 0.95rem; letter-spacing: -0.005em;
  background: var(--btn-bg);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
  white-space: nowrap;
}
.btn svg { transition: transform var(--dur) var(--ease); }
.btn--primary {
  --btn-bg: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 10px 30px -12px var(--accent), inset 0 1px 0 rgba(255,255,255,.35);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px -14px var(--accent), inset 0 1px 0 rgba(255,255,255,.35); }
.btn--primary:hover svg { transform: translateX(3px); }
.btn--ghost { border: 1px solid var(--line-2); color: var(--text); }
.btn--ghost:hover { border-color: var(--text-3); background: var(--surface); transform: translateY(-2px); }
.btn--sm { height: 40px; padding: 0 16px; font-size: var(--fs-sm); }

.icon-btn {
  width: 40px; height: 40px; display: grid; place-items: center;
  border-radius: 10px; color: var(--text-2);
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.icon-btn:hover { color: var(--text); background: var(--surface); border-color: var(--line); }
[data-theme="dark"] .i-moon, [data-theme="light"] .i-sun { display: none; }

kbd {
  font-family: var(--font-mono); font-size: 0.68rem; line-height: 1;
  padding: 4px 6px; border-radius: 5px;
  border: 1px solid var(--line-2); border-bottom-width: 2px;
  color: var(--text-2); background: var(--surface);
}
.kbd-btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 8px 0 12px; border-radius: 10px;
  border: 1px solid var(--line); color: var(--text-3); font-size: var(--fs-sm);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.kbd-btn:hover { border-color: var(--line-2); color: var(--text); background: var(--surface); }
.kbd-btn__label { margin-right: 4px; }

.chip {
  display: inline-flex; align-items: center;
  height: 26px; padding: 0 10px; border-radius: 999px;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.01em;
  color: var(--text-2); background: var(--surface-2); border: 1px solid var(--line);
  white-space: nowrap;
}

.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--good); box-shadow: 0 0 0 0 var(--good);
  animation: pulse 2.4s var(--ease) infinite;
  flex: none;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--good) 55%, transparent); }
  70%, 100% { box-shadow: 0 0 0 8px transparent; }
}

.scroll-progress { position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 120; pointer-events: none; }
.scroll-progress span {
  display: block; height: 100%; width: 100%;
  transform-origin: 0 50%; transform: scaleX(var(--progress, 0));
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}

/* 5. Header & hero --------------------------------------------------------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), backdrop-filter var(--dur);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom-color: var(--line);
}
.nav { height: 100%; display: flex; align-items: center; gap: var(--sp-5); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.01em; flex: none; }
.brand__mark { color: var(--text); }
.nav__links { display: flex; gap: 2px; margin-left: auto; }
.nav__links a {
  position: relative; display: inline-flex; align-items: center;
  height: 36px; padding: 0 12px; border-radius: 9px;
  font-size: var(--fs-sm); color: var(--text-2);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav__links a:hover { color: var(--text); background: var(--surface); }
.nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 4px; height: 2px; border-radius: 2px;
  background: var(--accent);
}
.nav__actions { display: flex; align-items: center; gap: 6px; }
.nav__toggle { display: none; }
.burger { position: relative; width: 18px; height: 10px; display: block; }
.burger span {
  position: absolute; left: 0; right: 0; height: 1.8px; border-radius: 2px; background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}
.burger span:first-child { top: 0; }
.burger span:last-child { top: 8px; }
[aria-expanded="true"] .burger span:first-child { top: 4px; transform: rotate(45deg); }
[aria-expanded="true"] .burger span:last-child { top: 4px; transform: rotate(-45deg); }

.hero {
  position: relative;
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--header-h) + 48px) 0 96px;
  overflow: hidden;
  isolation: isolate;
}
.hero__grid-bg {
  position: absolute; inset: 0; z-index: -1;
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 65% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 65% 40%, #000 30%, transparent 75%);
}
.hero::before {
  content: ""; position: absolute; z-index: -1;
  width: 900px; height: 900px; right: -260px; top: -300px;
  background: radial-gradient(circle, var(--accent-soft), transparent 60%);
  pointer-events: none;
}
.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: clamp(40px, 5vw, 80px);
  align-items: center;
}
.hero__inner > * { min-width: 0; }
.hero__copy { display: grid; gap: var(--sp-5); justify-items: start; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  height: 34px; padding: 0 14px 0 12px; border-radius: 999px;
  border: 1px solid var(--line-2); background: color-mix(in srgb, var(--surface) 70%, transparent);
  font-size: var(--fs-sm); color: var(--text-2);
}
.hero__name {
  font-size: var(--fs-hero);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: -0.055em;
  display: grid; gap: 18px;
}
.hero__role {
  font-family: var(--font-mono); font-weight: 400;
  font-size: clamp(0.8rem, 0.7rem + 0.35vw, 0.95rem);
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-2);
  display: inline-flex; flex-wrap: wrap; align-items: center; gap: 10px;
}
.hero__role-sep { color: var(--text-3); }
.hero__years { color: var(--signal); }
.hero__headline {
  font-size: clamp(1.55rem, 1.1rem + 1.7vw, 2.4rem);
  font-weight: 500; line-height: 1.15; letter-spacing: -0.03em;
  max-width: 20ch; text-wrap: balance;
}
.hero__headline em { color: var(--accent); }
.hero__lede { color: var(--text-2); font-size: var(--fs-md); max-width: 52ch; text-wrap: pretty; }
.hero__ctas { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin-top: var(--sp-2); }
.hero__facts {
  display: grid; grid-template-columns: repeat(3, auto); gap: var(--sp-6);
  margin-top: var(--sp-5); padding-top: var(--sp-5); border-top: 1px solid var(--line);
  width: 100%;
}
.hero__facts dt { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--text-3); margin-bottom: 4px; }
.hero__facts dd { font-size: var(--fs-sm); font-weight: 500; color: var(--text); }

/* Hero visual */
/* Diagram on the first line; code card and chip share the next line and wrap when space runs out. */
.hero__visual { position: relative; display: grid; gap: var(--sp-4); }
.topo {
  position: relative;
  border-radius: var(--r-xl);
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 92%, transparent), color-mix(in srgb, var(--bg-2) 92%, transparent));
  box-shadow: var(--shadow);
  overflow: hidden;
}
.topo__bar {
  display: flex; align-items: center; gap: 14px;
  height: 44px; padding: 0 16px;
  border-bottom: 1px solid var(--line);
  color: var(--text-3);
}
.topo__dots { display: inline-flex; gap: 6px; }
.topo__dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--line-2); }
.topo__live { margin-left: auto; display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: .12em; }
.topo__live .status-dot { width: 6px; height: 6px; }
.topo__svg { width: 100%; height: auto; padding: 8px 4px; overflow: visible; }
.topo__links use {
  fill: none; stroke: var(--line-2); stroke-width: 1.4;
  stroke-dasharray: 4 6;
  animation: dash 1.4s linear infinite;
}
@keyframes dash { to { stroke-dashoffset: -20; } }
.pk { fill: var(--accent); filter: drop-shadow(0 0 6px var(--accent)); }
.pk--s { fill: var(--signal); filter: drop-shadow(0 0 6px var(--signal)); }
.topo__ring { fill: none; stroke: var(--accent); stroke-opacity: .35; stroke-dasharray: 2 8; transform-origin: 280px 220px; }
.topo__ring--spin { animation: spin 30s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.topo__core rect { fill: var(--surface-2); stroke: var(--accent); stroke-opacity: .6; }
.topo__cloud { fill: var(--accent); }
.topo__core-label { font-family: var(--font-mono); font-size: 11px; fill: var(--text); letter-spacing: .02em; }
.node rect { fill: var(--surface); stroke: var(--line-2); transition: stroke var(--dur); }
.node__t { font-family: var(--font-sans); font-weight: 600; font-size: 12.5px; fill: var(--text); }
.node__s { font-family: var(--font-mono); font-size: 9.5px; fill: var(--text-3); }
.node--s rect { stroke: color-mix(in srgb, var(--signal) 45%, transparent); }

.codecard {
  position: relative;
  min-width: 0;
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface-2) 94%, transparent);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  overflow: hidden;
  transform: translateZ(0);
}
.codecard__bar {
  display: flex; align-items: center; justify-content: space-between;
  height: 36px; padding: 0 14px; border-bottom: 1px solid var(--line); color: var(--text-2);
}
.codecard__tag { color: var(--text-3); font-size: .66rem; text-transform: uppercase; letter-spacing: .12em; }
.codecard__pre {
  margin: 0; padding: 14px 16px 16px;
  font-family: var(--font-mono); font-size: 0.7rem; line-height: 1.75;
  color: var(--text-2); overflow-x: auto; white-space: pre;
  scrollbar-width: none;
}
.codecard__pre::-webkit-scrollbar { display: none; }
.codecard .k { color: var(--code-k); }
.codecard .t { color: var(--code-t); }
.codecard .f { color: var(--code-f); }
.codecard .n { color: var(--code-n); }
.codecard .c { color: var(--code-c); font-style: italic; }
.caret {
  display: inline-block; width: 7px; height: 1.1em; margin-left: 3px; vertical-align: -0.2em;
  background: var(--accent); animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.codecard__status {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; border-top: 1px solid var(--line);
}
.codecard__status strong { font-size: 1.05rem; letter-spacing: -0.02em; line-height: 1.1; margin-right: 8px; }
.codecard__status small { color: var(--text-3); font-size: 0.72rem; }
.codecard__ring { color: var(--text); flex: none; }
.codecard__ring svg { width: 28px; height: 28px; }

.hero__scroll {
  position: absolute; left: 50%; bottom: 24px; transform: translateX(-50%);
  display: grid; justify-items: center; gap: 8px; color: var(--text-3);
}
.hero__scroll .mono { font-size: .62rem; text-transform: uppercase; letter-spacing: .2em; }
.hero__scroll-line { width: 1px; height: 36px; background: linear-gradient(var(--text-3), transparent); position: relative; overflow: hidden; }
.hero__scroll-line::after {
  content: ""; position: absolute; left: 0; top: -40%; width: 1px; height: 40%; background: var(--accent);
  animation: drip 2.2s var(--ease) infinite;
}
@keyframes drip { to { top: 110%; } }

/* Marquee strip */
.strip {
  border-block: 1px solid var(--line);
  background: var(--bg-2);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.strip__track { display: flex; width: max-content; animation: marquee 48s linear infinite; }
.strip__track span {
  display: inline-flex; align-items: center; gap: 28px;
  padding: 20px 0 20px 28px;
  font-family: var(--font-mono); font-size: .8rem; color: var(--text-3); white-space: nowrap;
  letter-spacing: .04em;
}
.strip__track span::after { content: "◆"; font-size: .45rem; color: var(--accent); opacity: .7; }
.strip:hover .strip__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* 6. Impact ledger --------------------------------------------------------- */
.impact__layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.35fr);
  gap: clamp(40px, 7vw, 110px);
  align-items: start;
}
.section-head--sticky { position: sticky; top: calc(var(--header-h) + 40px); margin-bottom: 0; }
.ledger { counter-reset: led; border-top: 1px solid var(--line); }
.ledger__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(150px, 0.42fr) minmax(0, 1fr);
  gap: var(--sp-6);
  padding: clamp(24px, 3vw, 36px) 0 clamp(24px, 3vw, 36px) 20px;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease);
}
.ledger__row::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--accent); transform: scaleY(0); transform-origin: top;
  transition: transform 500ms var(--ease);
}
.ledger__row:hover::before, .ledger__row:focus-within::before { transform: scaleY(1); }
.ledger__row:hover { background: linear-gradient(90deg, var(--accent-soft), transparent 70%); }
.ledger__num {
  font-size: clamp(3rem, 2rem + 3vw, 4.6rem);
  font-weight: 600; line-height: 0.9; letter-spacing: -0.06em;
  font-variant-numeric: tabular-nums;
  display: flex; align-items: baseline;
}
.ledger__prefix { color: var(--accent); font-weight: 400; margin-right: 2px; font-size: .7em; }
.ledger__suffix { font-size: .5em; color: var(--text-2); margin-left: 4px; letter-spacing: -0.02em; }
.ledger__row--down .ledger__prefix { color: var(--signal); }
.ledger__row--quality .ledger__num { color: var(--good); }
.ledger__row--quality .ledger__suffix { color: var(--good); opacity: .8; }
.ledger__direction { display: block; margin-top: 10px; color: var(--text-3); font-family: var(--font-mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .12em; }
.ledger__body { display: grid; gap: 10px; align-content: start; }
.ledger__metric { font-size: var(--fs-lg); font-weight: 600; letter-spacing: -0.02em; line-height: 1.25; }
.ledger__story { color: var(--text-2); max-width: 60ch; }
.ledger__meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; align-items: center; }
.ledger__role { font-family: var(--font-mono); font-size: .7rem; color: var(--text-3); margin-right: 6px; }

/* 7. Expertise ------------------------------------------------------------- */
.seg {
  display: inline-flex; padding: 4px; gap: 2px; border-radius: 12px;
  background: var(--surface); border: 1px solid var(--line);
}
.seg__btn {
  height: 34px; padding: 0 16px; border-radius: 8px; font-size: var(--fs-sm); font-weight: 500; color: var(--text-3);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.seg__btn:hover { color: var(--text); }
.seg__btn.is-active { background: var(--surface-2); color: var(--text); box-shadow: 0 0 0 1px var(--line-2); }

.explorer {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.6fr);
  border-radius: var(--r-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-height: 520px;
}
.explorer__tabs { display: grid; align-content: start; border-right: 1px solid var(--line); padding: 10px; gap: 2px; background: var(--bg-2); }
.explorer__tab {
  position: relative;
  display: grid; grid-template-columns: 30px 1fr auto; align-items: center; gap: 10px;
  width: 100%; text-align: left;
  padding: 16px 14px; border-radius: 12px;
  color: var(--text-2);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.explorer__tab:hover { background: var(--surface); color: var(--text); }
.explorer__tab[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: 0 0 0 1px var(--line-2); }
.explorer__tab[aria-selected="true"] .explorer__idx { color: var(--accent); }
.explorer__idx { font-family: var(--font-mono); font-size: .72rem; color: var(--text-3); }
.explorer__name { font-weight: 600; font-size: .95rem; letter-spacing: -0.01em; line-height: 1.3; }
.explorer__count {
  font-family: var(--font-mono); font-size: .68rem; color: var(--text-3);
  min-width: 26px; height: 22px; display: grid; place-items: center; border-radius: 6px; border: 1px solid var(--line);
}
.explorer__panel { padding: clamp(24px, 4vw, 48px); display: grid; gap: var(--sp-6); align-content: start; }
.explorer__panel[hidden] { display: none; }
.explorer__panel.is-entering { animation: panelIn 480ms var(--ease) both; }
@keyframes panelIn { from { opacity: 0; transform: translateY(10px); } }
.panel__kicker { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .14em; color: var(--signal); }
.panel__title { font-size: var(--fs-xl); font-weight: 600; letter-spacing: -0.03em; line-height: 1.1; margin-top: 8px; }
.panel__summary { color: var(--text-2); font-size: var(--fs-md); max-width: 60ch; margin-top: 12px; }
.panel__skills {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden;
}
.panel__skill {
  background: var(--surface); padding: 16px 18px; display: grid; gap: 3px;
  transition: background-color var(--dur) var(--ease);
}
.panel__skill:hover { background: var(--surface-2); }
.panel__skill strong { font-weight: 600; font-size: .95rem; letter-spacing: -0.01em; display: flex; align-items: center; gap: 10px; }
.panel__skill strong::before { content: ""; width: 6px; height: 6px; border-radius: 2px; background: var(--accent); flex: none; transform: rotate(45deg); }
.panel__skill span { color: var(--text-3); font-size: var(--fs-sm); padding-left: 16px; }
.panel__skills > .panel__skill:last-child:nth-child(odd) { grid-column: 1 / -1; }
.panel__evidence {
  display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start;
  padding: 16px 18px; border-radius: var(--r-md);
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}
.panel__evidence .mono { color: var(--accent); text-transform: uppercase; letter-spacing: .14em; font-size: .66rem; padding-top: 3px; }
.panel__evidence p { color: var(--text); font-size: var(--fs-sm); }

.skill-index {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--r-xl); overflow: hidden;
}
.skill-index[hidden], .explorer[hidden] { display: none; }
.skill-index__group { background: var(--surface); padding: 28px; display: grid; gap: 14px; align-content: start; }
.skill-index__group h3 { font-size: 1rem; font-weight: 600; letter-spacing: -0.01em; display: flex; gap: 10px; align-items: baseline; }
.skill-index__group h3 span { font-family: var(--font-mono); font-size: .7rem; color: var(--accent); font-weight: 400; }
.skill-index__group ul { display: flex; flex-wrap: wrap; gap: 6px; }

/* 8. Experience ------------------------------------------------------------ */
.rail { margin-bottom: clamp(40px, 6vw, 72px); }
.rail__track { position: relative; display: flex; height: 52px; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: var(--surface); }
.rail__seg { position: relative; display: flex; align-items: center; padding: 0 16px; gap: 10px; font-size: var(--fs-sm); font-weight: 500; white-space: nowrap; overflow: hidden; }
.rail__seg + .rail__seg { border-left: 1px solid var(--line-2); }
.rail__seg small { font-family: var(--font-mono); font-size: .68rem; color: var(--text-3); font-weight: 400; }
.rail__seg--edu { background: repeating-linear-gradient(135deg, transparent 0 6px, var(--line) 6px 7px); color: var(--text-2); }
.rail__seg--analyst { background: var(--accent-soft); }
.rail__seg--consultant { background: color-mix(in srgb, var(--accent) 22%, transparent); }
.rail__seg--consultant::after {
  content: ""; position: absolute; right: 0; top: 0; bottom: 0; width: 40px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 35%, transparent));
}
.rail__years { display: flex; justify-content: space-between; margin-top: 10px; font-family: var(--font-mono); font-size: .7rem; color: var(--text-3); }

.roles { display: grid; gap: var(--sp-5); }
.role {
  display: grid;
  grid-template-columns: minmax(220px, 0.38fr) minmax(0, 1fr);
  border-radius: var(--r-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.role__meta { padding: clamp(24px, 3vw, 40px); border-right: 1px solid var(--line); display: grid; gap: var(--sp-4); align-content: start; background: var(--bg-2); }
.role__when { font-family: var(--font-mono); font-size: .72rem; color: var(--text-3); display: flex; align-items: center; gap: 8px; }
.role__badge {
  display: inline-flex; align-items: center; gap: 6px; height: 22px; padding: 0 8px; border-radius: 6px;
  font-family: var(--font-mono); font-size: .64rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--good); background: color-mix(in srgb, var(--good) 12%, transparent);
}
.role__title { font-size: var(--fs-xl); font-weight: 600; letter-spacing: -0.03em; line-height: 1.05; }
.role__company { color: var(--text-2); font-weight: 500; }
.role__focus { color: var(--text-2); font-size: var(--fs-sm); padding-top: var(--sp-4); border-top: 1px solid var(--line); }
.role__focus b { display: block; font-family: var(--font-mono); font-weight: 400; font-size: .66rem; text-transform: uppercase; letter-spacing: .14em; color: var(--text-3); margin-bottom: 6px; }
.role__themes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.role__theme { padding: clamp(24px, 3vw, 36px); display: grid; gap: var(--sp-4); align-content: start; }
.role__theme + .role__theme { border-left: 1px solid var(--line); }
.role__theme h4 { font-family: var(--font-mono); font-weight: 500; font-size: .7rem; text-transform: uppercase; letter-spacing: .14em; color: var(--accent); }
.role__theme ul { display: grid; gap: var(--sp-4); }
.role__theme li { position: relative; padding-left: 18px; color: var(--text-2); font-size: .94rem; line-height: 1.55; }
.role__theme li::before { content: ""; position: absolute; left: 0; top: .72em; width: 8px; height: 1px; background: var(--text-3); }
.role__theme li mark { background: none; color: var(--text); font-weight: 600; white-space: nowrap; }

/* 9. Highlights ------------------------------------------------------------ */
.hl { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 96px); align-items: start; }
.hl__viewer {
  position: sticky; top: calc(var(--header-h) + 40px);
  aspect-ratio: 1 / 0.86;
  border-radius: var(--r-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hl__viewer::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px); background-size: 22px 22px;
}
.hl__viewer-bar {
  position: absolute; left: 0; right: 0; top: 0; z-index: 2;
  display: flex; justify-content: space-between; align-items: center;
  height: 44px; padding: 0 18px; border-bottom: 1px solid var(--line);
  color: var(--text-3); background: color-mix(in srgb, var(--surface) 85%, transparent);
}
.hl__viewer-bar [data-hl-current] { color: var(--text); }
.hl__frame {
  position: absolute; inset: 44px 0 0 0; display: grid; place-items: center; padding: 28px;
  opacity: 0; transform: scale(.97); transition: opacity 500ms var(--ease), transform 600ms var(--ease);
}
.hl__frame.is-active { opacity: 1; transform: none; }
.hl__frame svg { width: 100%; height: 100%; max-height: 380px; }

.hl__list { display: grid; }
.hl__item { padding: clamp(32px, 5vw, 64px) 0; border-top: 1px solid var(--line); display: grid; gap: var(--sp-5); transition: opacity var(--dur) var(--ease); }
.hl__item:first-child { border-top: 0; padding-top: 0; }
.hl__head { display: grid; gap: 8px; }
.hl__num { font-family: var(--font-mono); font-size: .72rem; color: var(--accent); }
.hl__title { font-size: var(--fs-xl); font-weight: 600; letter-spacing: -0.03em; line-height: 1.1; }
.hl__tagline { font-family: var(--font-serif); font-style: italic; font-size: 1.3rem; color: var(--text-2); line-height: 1.3; }
.hl__inline { display: none; }
.hl__cao { display: grid; gap: 1px; background: var(--line); border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--line); }
.hl__cao > div { background: var(--surface); padding: 14px 18px; display: grid; grid-template-columns: 96px 1fr; gap: 14px; }
.hl__cao dt { font-family: var(--font-mono); font-size: .66rem; text-transform: uppercase; letter-spacing: .14em; color: var(--text-3); padding-top: 3px; }
.hl__cao dd { color: var(--text-2); font-size: .94rem; }
.hl__cao .is-outcome dt { color: var(--good); }
.hl__cao .is-outcome dd { color: var(--text); font-weight: 600; }
.hl__stack { display: flex; flex-wrap: wrap; gap: 6px; }
.hl__note { margin-top: var(--sp-6); }

/* Diagram primitives (inline SVG) */
.dg-box { fill: var(--surface-2); stroke: var(--line-2); }
.dg-box--accent { fill: var(--accent-soft); stroke: var(--accent); stroke-opacity: .7; }
.dg-box--signal { fill: var(--signal-soft); stroke: var(--signal); stroke-opacity: .7; }
.dg-line { fill: none; stroke: var(--text-3); stroke-width: 1.3; }
.dg-flow { fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-dasharray: 5 6; animation: dash 1.2s linear infinite; }
.dg-flow--signal { stroke: var(--signal); }
.dg-t { font-family: var(--font-sans); font-size: 13px; font-weight: 600; fill: var(--text); }
.dg-s { font-family: var(--font-mono); font-size: 10px; fill: var(--text-3); }
.dg-dot { fill: var(--accent); }
.dg-dot--signal { fill: var(--signal); }
.dg-cell { fill: var(--line-2); }
.dg-cell.on { fill: var(--accent); animation: cell 3.2s var(--ease) infinite; }
@keyframes cell { 0%, 100% { opacity: .35; } 50% { opacity: 1; } }

/* 10. Credentials ---------------------------------------------------------- */
.certs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sp-5); }
.cert {
  position: relative;
  display: grid; grid-template-rows: auto 1fr auto; gap: var(--sp-5);
  padding: 28px;
  border-radius: var(--r-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 500ms var(--ease);
}
.cert:hover { transform: translateY(-6px); }
.cert::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%), var(--accent-soft), transparent 50%);
  opacity: 0; transition: opacity var(--dur);
}
.cert:hover::after { opacity: 1; }
.cert__top { display: flex; justify-content: space-between; align-items: start; }
.emblem {
  position: relative; width: 84px; height: 84px; display: grid; place-items: center;
}
.emblem::before, .emblem::after { content: ""; position: absolute; border-radius: 50%; }
.emblem::before {
  inset: 0;
  background: conic-gradient(from 210deg, var(--accent), var(--accent-2), var(--signal), var(--accent));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 2px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 2px));
  transition: transform 900ms var(--ease);
}
.emblem::after { inset: 9px; border: 1px dashed var(--line-2); }
.cert:hover .emblem::before { transform: rotate(180deg); }
.emblem span { font-family: var(--font-mono); font-weight: 500; font-size: 1.05rem; letter-spacing: .02em; }
.cert__issuer { font-family: var(--font-mono); font-size: .66rem; text-transform: uppercase; letter-spacing: .14em; color: var(--text-3); text-align: right; line-height: 1.6; }
.cert__issuer b { display: block; color: var(--good); font-weight: 500; }
.cert__name { font-size: 1.35rem; font-weight: 600; letter-spacing: -0.025em; line-height: 1.15; }
.cert__full { color: var(--text-3); font-size: var(--fs-sm); margin-top: 6px; }
.cert__focus { color: var(--text-2); font-size: .94rem; padding-top: var(--sp-5); border-top: 1px dashed var(--line-2); }

.edu {
  margin-top: clamp(48px, 7vw, 96px);
  display: grid; grid-template-columns: auto 1fr auto; gap: var(--sp-6); align-items: center;
  padding: 28px 32px;
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background: linear-gradient(90deg, var(--bg-2), transparent);
}
.edu__label { font-family: var(--font-mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .14em; color: var(--accent); }
.edu__degree { font-size: var(--fs-lg); font-weight: 600; letter-spacing: -0.02em; }
.edu__school { color: var(--text-2); }
.edu__when { font-family: var(--font-mono); font-size: .78rem; color: var(--text-3); white-space: nowrap; }

/* 11. Contact -------------------------------------------------------------- */
.contact { overflow: hidden; isolation: isolate; text-align: center; }
.contact__glow {
  position: absolute; z-index: -1; left: 50%; top: 40%;
  width: 1100px; height: 700px; transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, var(--accent-soft), transparent);
}
.contact__inner { display: grid; justify-items: center; gap: var(--sp-5); }
.contact__title { font-size: clamp(2.4rem, 1.4rem + 4.6vw, 5.4rem); font-weight: 600; letter-spacing: -0.05em; line-height: 1; max-width: 14ch; text-wrap: balance; }
.contact__lede { margin-inline: auto; }
.contact__primary { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: var(--sp-4); margin-top: var(--sp-5); }
.contact__email { display: grid; gap: 6px; justify-items: center; }
.contact__email-text {
  font-size: clamp(1.15rem, 0.8rem + 1.8vw, 2rem); font-weight: 500; letter-spacing: -0.03em;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1.5px no-repeat;
  transition: background-size 500ms var(--ease), color var(--dur);
  padding-bottom: 4px;
  overflow-wrap: anywhere;
}
.contact__email:hover .contact__email-text { background-size: 100% 1.5px; color: var(--accent); }
.contact__label { color: var(--text-3); text-transform: uppercase; letter-spacing: .14em; font-size: .66rem; }
.contact__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sp-4); width: 100%; max-width: 900px; margin-top: var(--sp-7); text-align: left; }
.contact__card {
  height: 100%;
  display: grid; gap: 6px; padding: 22px 24px; border-radius: var(--r-lg);
  border: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 70%, transparent);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
a.contact__card:hover { border-color: var(--accent); transform: translateY(-3px); background: var(--surface); }
.contact__value { font-size: 1.1rem; font-weight: 600; letter-spacing: -0.02em; }
.contact__hint { color: var(--text-3); font-size: var(--fs-sm); }
.contact__card--placeholder { border-style: dashed; }
.contact__card--placeholder .contact__value { color: var(--text-2); }

/* 12. Footer --------------------------------------------------------------- */
.footer { border-top: 1px solid var(--line); padding: 40px 0 48px; background: var(--bg-2); }
.footer__inner { display: grid; grid-template-columns: 1fr auto; gap: var(--sp-5) var(--sp-6); align-items: center; }
.footer__brand { display: grid; gap: 2px; }
.footer__brand span { color: var(--text-3); font-size: var(--fs-sm); }
.footer__links { display: flex; flex-wrap: wrap; gap: 4px 20px; font-size: var(--fs-sm); color: var(--text-2); }
.footer__links a { transition: color var(--dur); }
.footer__links a:hover { color: var(--accent); }
.footer__links .is-placeholder { color: var(--text-3); }
.footer__legal { grid-column: 1 / -1; color: var(--text-3); padding-top: var(--sp-5); border-top: 1px solid var(--line); font-size: .68rem; }

/* 13. Palette / toast ------------------------------------------------------ */
.palette {
  width: min(560px, calc(100vw - 32px));
  margin: 14vh auto auto; padding: 0; border: 0; background: transparent; color: var(--text);
  overflow: visible;
}
.palette::backdrop { background: color-mix(in srgb, var(--bg) 60%, transparent); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.palette[open] .palette__box { animation: palIn 260ms var(--ease) both; }
@keyframes palIn { from { opacity: 0; transform: translateY(-8px) scale(.98); } }
.palette__box { border-radius: var(--r-lg); background: var(--surface); box-shadow: var(--shadow), 0 40px 120px -40px rgba(0,0,0,.6); overflow: hidden; }
.palette__search { display: flex; align-items: center; gap: 12px; padding: 0 16px; height: 56px; border-bottom: 1px solid var(--line); color: var(--text-3); }
.palette__search input { flex: 1; min-width: 0; height: 100%; border: 0; outline: 0; background: transparent; color: var(--text); font: inherit; font-size: 1rem; }
.palette__search input::placeholder { color: var(--text-3); }
.palette__list { max-height: 360px; overflow-y: auto; padding: 8px; }
.palette__item {
  display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: 10px; cursor: pointer; color: var(--text-2);
}
.palette__item[aria-selected="true"] { background: var(--accent-soft); color: var(--text); }
.palette__item .mono { margin-left: auto; color: var(--text-3); font-size: .66rem; text-transform: uppercase; letter-spacing: .12em; }
.palette__icon { width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; background: var(--surface-2); border: 1px solid var(--line); font-family: var(--font-mono); font-size: .7rem; color: var(--accent); flex: none; }
.palette__empty { padding: 20px 12px; color: var(--text-3); font-size: var(--fs-sm); }

.toast {
  position: fixed; left: 50%; bottom: 28px; z-index: 150;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  padding: 12px 18px; border-radius: 12px;
  background: var(--text); color: var(--bg); font-size: var(--fs-sm); font-weight: 500;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* 14. Motion --------------------------------------------------------------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 800ms var(--ease), transform 900ms var(--ease); transition-delay: var(--d, 0ms); }
.js .reveal.is-visible { opacity: 1; transform: none; }
/* Hero animates on load with CSS alone, so it never depends on JavaScript succeeding. */
.js .hero .reveal { opacity: 1; transform: none; transition: none; animation: heroIn 900ms var(--ease) both; }
.hero__copy > :nth-child(1) { animation-delay: 80ms; }
.hero__copy > :nth-child(2) { animation-delay: 150ms; }
.hero__copy > :nth-child(3) { animation-delay: 220ms; }
.hero__copy > :nth-child(4) { animation-delay: 290ms; }
.hero__copy > :nth-child(5) { animation-delay: 360ms; }
.hero__copy > :nth-child(6) { animation-delay: 430ms; }
.hero__visual.reveal { animation-delay: 300ms; animation-duration: 1200ms; }
@keyframes heroIn { from { opacity: 0; transform: translateY(18px); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .topo__packets, .caret, .dg-dot { display: none; }
  .strip__track { flex-wrap: wrap; width: auto; justify-content: center; }
  .strip__track span[aria-hidden="true"] { display: none; }
}
:root.reduce-motion .topo__packets, :root.reduce-motion .dg-dot { display: none; }

/* 15. Responsive ----------------------------------------------------------- */
@media (max-width: 1100px) {
  .nav__links a { padding: 0 9px; }
  .kbd-btn__label { display: none; }
  .role__themes { grid-template-columns: 1fr; }
  .role__theme + .role__theme { border-left: 0; border-top: 1px solid var(--line); }
}

/* Short desktop screens (e.g. 1366×768, 1440×900): keep both hero columns within the viewport. */
@media (min-width: 961px) and (max-height: 900px) {
  .hero { padding-top: calc(var(--header-h) + 24px); }
  .hero__copy { gap: var(--sp-4); }
  .hero__name { font-size: min(var(--fs-hero), 11.5svh); }
  /* The diagram scales down inside its full-width panel, so edges stay aligned. */
  .topo__svg { max-height: calc(104px + 21svh); }
}

@media (max-width: 960px) {
  :root { --header-h: 62px; }
  .nav__toggle { display: grid; }
  .kbd-btn { display: none; }
  .nav__links {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; gap: 0;
    padding: 12px var(--gutter) 24px;
    background: color-mix(in srgb, var(--bg) 96%, transparent);
    -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  }
  .nav__links.is-open { transform: none; opacity: 1; visibility: visible; transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s; }
  .nav__links a { height: 52px; font-size: 1.05rem; border-bottom: 1px solid var(--line); border-radius: 0; padding: 0 4px; }
  .nav__links a.is-active::after { left: auto; right: 4px; top: 50%; bottom: auto; width: 6px; height: 6px; border-radius: 50%; transform: translateY(-50%); }
  .site-header.menu-open { background: var(--bg); border-bottom-color: var(--line); }

  .hero { min-height: auto; padding-top: calc(var(--header-h) + 40px); }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { max-width: 640px; width: 100%; margin-inline: auto; }
  .hero__scroll { display: none; }

  .section-head--split { grid-template-columns: 1fr; align-items: start; }
  .impact__layout { grid-template-columns: 1fr; }
  .section-head--sticky { position: static; }

  .explorer { grid-template-columns: 1fr; min-height: 0; }
  .explorer__tabs {
    display: flex; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--line);
    scroll-snap-type: x mandatory; scrollbar-width: none;
  }
  .explorer__tabs::-webkit-scrollbar { display: none; }
  .explorer__tab { grid-template-columns: auto auto; flex: none; width: auto; scroll-snap-align: start; padding: 12px 14px; }
  .explorer__count { display: none; }
  .skill-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .role { grid-template-columns: 1fr; }
  .role__meta { border-right: 0; border-bottom: 1px solid var(--line); }

  .hl { grid-template-columns: 1fr; }
  .hl__viewer { display: none; }
  .hl__inline {
    display: block; position: relative; border-radius: var(--r-lg); background: var(--surface); box-shadow: var(--shadow);
    padding: 12px; aspect-ratio: 4 / 3; /* matches the diagrams' 400×300 viewBox so they render at full width */
  }
  .hl__inline svg { width: 100%; height: 100%; }
  .hl__inline .dg-s { font-size: 12px; }
  .hl__inline .dg-t { font-size: 14px; }

  .certs { grid-template-columns: 1fr; max-width: 560px; }
  .contact__grid { grid-template-columns: 1fr; max-width: 480px; }
}

@media (max-width: 640px) {
  .hero__facts { grid-template-columns: 1fr 1fr; gap: var(--sp-4) var(--sp-5); }
  .hero__facts > div:last-child { grid-column: 1 / -1; }
  .hero__ctas { width: 100%; }
  .hero__ctas .btn { flex: 1 1 auto; }
  .hero { padding-bottom: 56px; }
  /* Scale the snippet so its longest line (52 chars ≈ 32.5em in JetBrains Mono) fits instead of scrolling. */
  .codecard__pre { padding-inline: 12px; font-size: min(0.7rem, calc((100vw - 2 * var(--gutter) - 24px) / 33)); }
  /* Diagram labels: drop the sub-captions and enlarge titles so they stay legible when scaled down. */
  .node__s { display: none; }
  .node__t { font-size: 17px; transform: translateY(6px); }
  .topo__core-label { font-size: 13px; }
  .topo__svg { padding: 0; }

  .ledger__row { grid-template-columns: 1fr; gap: var(--sp-3); padding-left: 16px; }
  .panel__skills { grid-template-columns: 1fr; }
  .panel__evidence { grid-template-columns: 1fr; gap: 6px; }
  .skill-index { grid-template-columns: 1fr; }
  .hl__cao > div { grid-template-columns: 1fr; gap: 4px; }
  .edu { grid-template-columns: 1fr; gap: var(--sp-3); padding: 24px; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__links a { padding-block: 8px; }
  .rail__seg small { display: none; }
  .rail__seg { padding: 0 10px; font-size: .78rem; }
}

@media print {
  .site-header, .scroll-progress, .hero__visual, .strip, .palette, .toast, .hero__scroll { display: none !important; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
  body { background: #fff; color: #000; }
}