/* ==========================================================================
   Aadit Singal · Robotics + AI
   Design tokens, layout, components.
   ========================================================================== */

:root {
  /* Accent. The source design ships four options. Swap this one line:
     green  oklch(0.82 0.17 145)   amber oklch(0.8 0.16 85)
     blue   oklch(0.78 0.14 205)   red   oklch(0.75 0.18 25)            */
  --acc: oklch(0.82 0.17 145);

  /* Surfaces */
  --bg:        oklch(0.15 0.006 80);
  --bg-header: oklch(0.15 0.006 80 / 0.92);
  --bg-elev:   oklch(0.17 0.006 80);
  --bg-track:  oklch(0.24 0.006 80);

  /* Type */
  --fg:      oklch(0.93 0.004 80);
  --fg-85:   oklch(0.85 0.005 80);
  --fg-80:   oklch(0.80 0.005 80);
  --fg-78:   oklch(0.78 0.005 80);
  --fg-75:   oklch(0.75 0.005 80);
  --fg-72:   oklch(0.72 0.005 80);
  --fg-70:   oklch(0.70 0.005 80);
  --fg-68:   oklch(0.68 0.005 80);
  --fg-66:   oklch(0.66 0.005 80);
  --fg-63:   oklch(0.63 0.005 80);
  --fg-62:   oklch(0.62 0.005 80);
  --fg-60:   oklch(0.60 0.005 80);
  --fg-58:   oklch(0.58 0.005 80);

  /* Lines */
  --rule:      oklch(0.28 0.006 80);
  --rule-soft: oklch(0.24 0.006 80);
  --edge-30:   oklch(0.30 0.006 80);
  --edge-32:   oklch(0.32 0.006 80);
  --edge-35:   oklch(0.35 0.006 80);
  --edge-38:   oklch(0.38 0.006 80);
  --edge-45:   oklch(0.45 0.006 80);

  /* Status */
  --warn:     oklch(0.80 0.14 85);
  --danger:   oklch(0.72 0.16 25);
  --shadow:   oklch(0.08 0.006 80 / 0.8);

  --mono: 'Fragment Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Archivo', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --header-h: 88px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--acc); }

:focus-visible { outline: 2px solid var(--acc); outline-offset: 3px; }

::selection { background: var(--acc); color: var(--bg); }

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

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

.acc { color: var(--acc); }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* Anchor targets clear the sticky header */
:target { scroll-margin-top: var(--header-h); }
#work, #loops, #contact, #versus, #ros { scroll-margin-top: var(--header-h); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 50;
  background: var(--acc);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 13px;
  padding: 10px 16px;
}
.skip-link:focus {
  left: 32px;
  top: 12px;
  color: var(--bg);
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  background: var(--bg-header);
  backdrop-filter: blur(8px);
  font-family: var(--mono);
  font-size: 13px;
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand__mark {
  display: inline-block;
  width: 11px;
  height: 11px;
  border: 2px solid var(--acc);
  border-radius: 50%;
}

.brand__name {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
}

.brand__cmd { color: var(--fg-62); }

.site-nav { display: flex; gap: 28px; color: var(--fg-70); }

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 56px;
  align-items: center;
  padding: 96px 0 72px;
  border-bottom: 1px solid var(--rule);
}

.hero__eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(56px, 9vw, 116px);
  line-height: 0.95;
  font-weight: 800;
  font-stretch: 115%;
  letter-spacing: -0.02em;
}

.hero__lede {
  max-width: 600px;
  font-size: 24px;
  line-height: 1.45;
  font-weight: 500;
  margin-top: 36px;
  text-wrap: pretty;
}

.hero__body {
  max-width: 600px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg-75);
  margin-top: 18px;
  text-wrap: pretty;
}

.hero__links {
  display: flex;
  gap: 14px;
  margin-top: 40px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 13px;
}

.btn { border: 1px solid var(--edge-35); padding: 10px 18px; }
.btn:hover { border-color: var(--acc); color: var(--acc); }

/* fig 0 · the loop diagram */

.loop { width: 320px; flex-shrink: 0; font-family: var(--mono); font-size: 12px; }
.loop__inner { position: relative; padding-right: 64px; }

.loop__block {
  display: block;
  border: 1px solid var(--edge-38);
  padding: 14px 16px;
  background: var(--bg-elev);
}
.loop__block:hover { border-color: var(--acc); }

.loop__label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--fg);
}

.loop__meta { display: block; margin-top: 4px; color: var(--fg-62); }

.loop__edge { margin: 6px 0 6px 24px; color: var(--fg-60); }

.loop__return {
  position: absolute;
  right: 22px;
  top: 26px;
  bottom: 26px;
  width: 34px;
  border-top: 1px dashed var(--edge-45);
  border-right: 1px dashed var(--edge-45);
  border-bottom: 1px dashed var(--edge-45);
}
.loop__return-head { position: absolute; left: -8px; top: -8px; color: var(--acc); }
.loop__return-label {
  position: absolute;
  right: -42px;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  color: var(--fg-62);
  white-space: nowrap;
}

.loop__caption { margin-top: 16px; color: var(--fg-58); }

/* ==========================================================================
   Section scaffolding
   ========================================================================== */

.section--work  { padding: 80px 0 24px; }
.section--log   { padding: 56px 0; border-top: 1px solid var(--rule); }
.section--also  { padding: 48px 0; border-top: 1px solid var(--rule); }
.section--split { padding: 56px 0; border-top: 1px solid var(--rule); display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }

.section__head { display: flex; align-items: baseline; gap: 18px; }
.section--work  .section__head { margin-bottom: 56px; }
.section--log   .section__head { margin-bottom: 48px; }
.section--also  .section__head { margin-bottom: 28px; }
.section--split .section__head { margin-bottom: 32px; }

.section__num { font-family: var(--mono); font-size: 13px; color: var(--acc); }

.section__title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-70);
}

/* ==========================================================================
   Projects
   ========================================================================== */

.project { display: grid; gap: 56px; }
.project--versus { grid-template-columns: 1.1fr 0.9fr; padding-bottom: 72px; border-bottom: 1px solid var(--rule); }
.project--ros    { grid-template-columns: 0.9fr 1.1fr; padding: 72px 0; }

.project__meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-68);
  margin-bottom: 14px;
}

.project__title {
  font-size: 44px;
  font-weight: 800;
  font-stretch: 110%;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.project__tag { font-size: 17px; color: var(--acc); margin-bottom: 22px; }

/* signal-flow strip */

.flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  row-gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  margin-bottom: 24px;
}
.flow__node {
  border: 1px solid var(--edge-38);
  padding: 8px 12px;
  white-space: nowrap;
  color: var(--fg-85);
}
.flow__link { text-align: center; padding: 0 8px; color: var(--fg-60); }
.flow__feedback { flex-basis: 100%; margin-top: 8px; color: var(--fg-60); }

.project__intro {
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg-78);
  margin-bottom: 20px;
  text-wrap: pretty;
}

.points {
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg-80);
}
.points--dim { color: var(--fg-78); }
.points li { display: flex; gap: 12px; }
.points__arrow { color: var(--acc); font-family: var(--mono); }
.points strong { color: var(--fg); font-weight: 600; }
.points em {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--fg-68);
}

/* interactive panels */

.panel { margin-top: 26px; border: 1px solid var(--edge-30); padding: 20px 22px; }

.panel__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  font-family: var(--mono);
  margin-bottom: 16px;
}
.panel__head--race { align-items: center; }

.panel__label { font-size: 12px; letter-spacing: 0.12em; color: var(--fg-62); }

.panel__note {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-58);
  margin-top: 14px;
}

.score { font-size: 26px; font-weight: 400; white-space: nowrap; color: var(--acc); }
.score__status { font-size: 12px; }
.score--ready    { color: var(--acc); }
.score--moderate { color: var(--warn); }
.score--recover  { color: var(--danger); }

.sliders {
  display: grid;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-72);
}
.slider-row {
  display: grid;
  grid-template-columns: 120px 1fr 36px;
  gap: 14px;
  align-items: center;
}
.slider-row output { text-align: right; }
input[type=range] { width: 100%; accent-color: var(--acc); }

.race-btn {
  font-family: var(--mono);
  font-size: 12px;
  background: none;
  border: 1px solid var(--acc);
  color: var(--acc);
  padding: 7px 14px;
  cursor: pointer;
}
.race-btn:hover { background: var(--acc); color: var(--bg); }

.race {
  display: grid;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-72);
}
.race-row {
  display: grid;
  grid-template-columns: 172px 1fr 134px;
  gap: 14px;
  align-items: center;
}
.race-cmd { white-space: nowrap; color: var(--fg-85); }
.race-time { white-space: nowrap; }
.race-track { display: block; height: 8px; background: var(--bg-track); overflow: hidden; }
.race-fill { display: block; height: 100%; width: 0; background: var(--acc); }
.race-fill--rejected { background: var(--warn); }
.race-time { text-align: right; }

/* Measured parse times (qwen3:8b, warm, in-container). The bars run at real
   speed, so these durations are the benchmark, not a design choice. */
.race-fill--t03 { transition: width 0.3s linear; }
.race-fill--t09 { transition: width 0.9s linear; }
.race-fill--t10 { transition: width 1.0s linear; }
.race-fill--t47 { transition: width 4.7s linear; }

.project__foot {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 13px;
}
.project__stack { color: var(--fg-66); }

/* figures */

/* align-self:start keeps the stage at its composed height instead of being
   stretched to the (much taller) prose column, which would strand the watch
   hundreds of pixels below the phone. */
.figure { display: grid; grid-template-rows: auto auto; gap: 16px; margin: 0; align-self: start; }
.figure__caption { font-family: var(--mono); font-size: 13px; color: var(--fg-66); }

.figure--versus .figure__stage { position: relative; height: 560px; }

.device { overflow: hidden; background: #000; border: 1px solid var(--edge-32); }
.device img { width: 100%; height: 100%; object-fit: cover; }

.device--phone {
  position: absolute;
  left: 0;
  top: 0;
  width: 250px;
  height: 540px;
  border-radius: 30px;
}
.device--watch {
  position: absolute;
  right: 8px;
  bottom: 24px;
  width: 210px;
  height: 250px;
  border-radius: 38px;
  box-shadow: 0 24px 60px var(--shadow);
}

.figure--ros .figure__stage { min-height: 360px; }
.figure__stage--empty {
  display: grid;
  place-items: center;
  padding: 24px;
  border: 1px dashed var(--edge-38);
  border-radius: 12px;
  background: var(--bg-elev);
}
.slot-placeholder {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-58);
  text-align: center;
  text-wrap: balance;
}

/* ==========================================================================
   02 · Log
   ========================================================================== */

.log { display: grid; gap: 0; }

.log__row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  padding: 26px 0;
  border-top: 1px solid var(--rule-soft);
}

.log__when {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-68);
  line-height: 1.7;
}
.log__tag { color: var(--acc); }

.log__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.log__role { font-size: 19px; font-weight: 700; }
.log__org { font-size: 15px; color: var(--fg-72); }

.log__body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg-78);
  max-width: 720px;
  text-wrap: pretty;
}

.log__out {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  margin-top: 12px;
  opacity: 0.85;
}

/* ==========================================================================
   03 · Also built
   ========================================================================== */

.also { display: grid; gap: 14px; font-size: 15px; line-height: 1.6; color: var(--fg-78); }
.also__row { display: flex; gap: 12px; flex-wrap: wrap; align-items: baseline; }
.also__row strong { color: var(--fg); font-weight: 600; }
.also__body { max-width: 640px; }
.also__stack { font-family: var(--mono); font-size: 13px; color: var(--fg-66); }

/* ==========================================================================
   04 / 05 · Toolkit + Education
   ========================================================================== */

.toolkit { display: grid; gap: 16px; font-size: 15px; }
.spec-row { display: grid; grid-template-columns: 120px 1fr; gap: 16px; }
.spec-row__key {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-68);
  padding-top: 2px;
}
.spec-row__val { color: var(--fg-85); }
.toolkit__note { font-size: 14px; color: var(--fg-63); margin-top: 2px; }

.edu__school { font-size: 17px; font-weight: 700; }
.edu__degree { font-size: 15px; color: var(--fg-78); margin-top: 4px; }
.edu__notes {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-68);
  margin-top: 14px;
  line-height: 1.7;
}

/* ==========================================================================
   Contact
   ========================================================================== */

.contact { padding: 88px 0 64px; border-top: 1px solid var(--rule); }

.contact__lede {
  max-width: 560px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg-78);
  margin-bottom: 36px;
  text-wrap: pretty;
}

.contact__line {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  margin-bottom: 20px;
}

.contact__email {
  display: inline-block;
  font-size: clamp(30px, 5vw, 58px);
  font-weight: 800;
  font-stretch: 110%;
  letter-spacing: -0.01em;
  word-break: break-word;
}

.contact__seeking {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--acc);
  margin-top: 26px;
}

.contact__now {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-68);
  margin-top: 10px;
}

.contact__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 56px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-68);
  flex-wrap: wrap;
  gap: 12px;
}
.contact__social { display: flex; gap: 24px; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; gap: 48px; align-items: start; }
  .loop { width: 100%; max-width: 360px; }
}

@media (max-width: 960px) {
  .project--versus,
  .project--ros { grid-template-columns: 1fr; gap: 40px; }
  .project--ros .figure--ros { order: 2; }
  .project--ros .project__copy { order: 1; }

  .figure--versus .figure__stage {
    position: static;
    height: auto;
    display: flex;
    align-items: flex-end;
    gap: 20px;
  }
  .device--phone,
  .device--watch { position: static; height: auto; }
  .device--phone { width: min(250px, 52%); aspect-ratio: 250 / 540; }
  .device--watch { width: min(210px, 44%); aspect-ratio: 210 / 250; }

  .section--split { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  .skip-link:focus { left: 20px; }

  .site-header { flex-wrap: wrap; gap: 10px; padding: 16px 0; }
  .site-nav { gap: 20px; }

  .hero { padding: 64px 0 56px; }
  .hero__lede { font-size: 21px; margin-top: 28px; }

  .section--work { padding: 64px 0 16px; }
  .project--versus { padding-bottom: 56px; }
  .project--ros { padding: 56px 0; }
  .project__title { font-size: 34px; }

  .panel { padding: 18px 16px; }
  .panel__head { flex-wrap: wrap; gap: 10px; }
  .slider-row { grid-template-columns: 92px 1fr 30px; gap: 10px; }

  /* Command and timing on one line, bar on its own beneath. */
  .race { gap: 16px; }
  .race-row { grid-template-columns: 1fr auto; gap: 6px 12px; }
  .race-cmd { grid-column: 1; grid-row: 1; }
  .race-time { grid-column: 2; grid-row: 1; }
  .race-track { grid-column: 1 / -1; grid-row: 2; }

  .log__row { grid-template-columns: 1fr; gap: 10px; }
  .log__when { line-height: 1.5; }

  .contact { padding: 64px 0 48px; }
  .contact__foot { flex-direction: column; align-items: flex-start; gap: 14px; }
}

@media (max-width: 560px) {
  .brand__cmd { display: none; }
  .figure--versus .figure__stage { gap: 12px; }
}

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