/* ==========================================================================
   BrainCodes — project page
   1. Design tokens
   2. Base & reset
   3. Accessibility
   4. Layout primitives
   5. Hero
   6. Buttons
   7. Typography
   8. Components
   9. Footer
  10. Motion
  11. Responsive
   ========================================================================== */


/* 1. Design tokens
   ========================================================================== */

:root {
  /* neutrals */
  --ink:        #14152e;
  --ink-soft:   #444a6b;
  --ink-faint:  #595e77;
  --paper:      #fdfdff;
  --paper-warm: #f2f4ff;
  --line:       #e0e4f7;

  /* brand */
  --blue:      #2b5cff;
  --blue-deep: #143bd6;
  --cyan:      #00c9d6;
  --cyan-lit:  #2ee8dd;
  --lilac:     #9147ff;
  --lilac-lit: #b578ff;
  --grad: linear-gradient(100deg, var(--blue) 0%, var(--cyan) 48%, var(--lilac) 100%);
  /* two-tone variant for everything outside the hero title */
  --grad-bc: linear-gradient(100deg, var(--blue) 0%, var(--cyan) 100%);

  /* type */
  --sans: "Segoe UI Variable Text", "Segoe UI Variable", "Segoe UI", "Selawik",
          -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --display: "Segoe UI Variable Display", "Segoe UI Variable", "Segoe UI Semibold",
             "Segoe UI", "Selawik", -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  --mono: "Cascadia Code", "Cascadia Mono", ui-monospace, Consolas, "SF Mono", Menlo, monospace;

  /* metrics */
  --wrap: 1120px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}


/* 2. Base & reset
   ========================================================================== */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

a:hover {
  color: var(--blue-deep);
}

::selection {
  background: rgba(43, 92, 255, .18);
}


/* 3. Accessibility
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  background: var(--ink);
  color: #fff;
}

.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
  box-shadow: 0 0 0 3px rgba(11, 15, 38, 0.92);
}


/* 4. Layout primitives
   ========================================================================== */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 28px;
}

.section {
  position: relative;
  padding: 68px 0;
}

.section--tint {
  background: var(--paper-warm);
  border-block: 1px solid var(--line);
}

.section--dark {
  background:
    radial-gradient(900px 460px at 12% -20%, rgba(43, 92, 255, .34), transparent 62%),
    radial-gradient(760px 420px at 88% 110%, rgba(0, 201, 214, .22), transparent 62%),
    #0c0e24;
  color: #e9ecf8;
}

/* two-column section: prose on the left, boxes stacked on the right */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

/* heading that spans both columns so the side box aligns with the content */
.split__head {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

/* the BibTeX block needs more room than the default split ratio */
#citation.section .split {
  grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
}


/* 5. Hero
   ========================================================================== */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1000px 560px at 50% -18%, #ffffff, transparent 68%),
    linear-gradient(180deg, #fdfdff 0%, var(--paper-warm) 100%);
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero__veil {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(720px 400px at 50% 46%,
    rgba(253, 253, 255, .93) 0%, rgba(253, 253, 255, .55) 46%, transparent 76%);
}

.hero__inner {
  position: relative;
  width: 100%;
  max-width: 940px;
  margin-inline: auto;
  padding: 46px 28px 52px;
  text-align: center;
}

.suptitle {
  margin: 0 0 14px;
  color: var(--ink-faint);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .10em;
  text-transform: uppercase;
}

.hero__title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2rem, 4.4vw, 3.15rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -.028em;
  text-wrap: balance;
}

.hero__title-name {
  display: block;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__title-rest {
  display: block;
  margin-top: .1em;
  color: var(--ink);
  font-size: .84em;
  font-weight: 500;
  letter-spacing: -.024em;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px 20px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  font-size: 1.08rem;
}

.authors sup {
  padding-left: 2px;
  color: var(--ink-faint);
  font-size: .68em;
}

.affiliations {
  margin: 6px 0 0;
  color: var(--ink-faint);
  font-size: 1rem;
}

.affiliations sup {
  font-size: .72em;
}


/* 6. Buttons
   ========================================================================== */

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 38px;
}

.btn {
  position: relative;
  z-index: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  overflow: hidden;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-size: .93rem;
  font-weight: 600;
  line-height: 1.2;
  transition:
    transform .22s var(--ease),
    box-shadow .22s var(--ease),
    border-color .22s var(--ease),
    color .22s var(--ease);
}

/* gradient fill that fades in on hover */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--grad-bc);
  opacity: 0;
  transition: opacity .25s var(--ease);
}

.btn svg {
  display: block;
  flex: none;
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn svg.fill {
  fill: currentColor;
  stroke: none;
}

.btn:hover {
  transform: translateY(-2px);
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(43, 92, 255, .22);
  color: #fff;
}

.btn:hover::before {
  opacity: 1;
}


/* 7. Typography
   ========================================================================== */

.h2 {
  margin: 0 0 14px;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.6rem, 3vw, 2.05rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -.026em;
  text-wrap: balance;
}

.h2--light {
  color: #fff;
}

.lede {
  margin: 0 0 12px;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.05rem, 1.7vw, 1.2rem);
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: -.01em;
}

.prose {
  max-width: 68ch;
  margin: 0 0 12px;
  color: var(--ink-soft);
}

.prose--wide {
  max-width: none;
}

.prose--single {
  max-width: none;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.prose--light {
  color: #b6bede;
}

.prose--light a {
  color: var(--cyan-lit);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose--light a:hover {
  color: #8fb0ff;
}


/* 8. Components
   ========================================================================== */

/* 8.1 Pillars — side boxes of a .split section */

.pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.pillar {
  position: relative;
  overflow: hidden;
  padding: 19px 20px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.pillar::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-bc);
  opacity: 0;
  transition: opacity .3s var(--ease);
}

.pillar:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(20, 21, 46, .09);
}

.pillar:hover::before {
  opacity: 1;
}

.pillar h3 {
  margin: 0 0 5px;
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -.015em;
}

.pillar p {
  margin: 0;
  color: var(--ink-soft);
  font-size: .9rem;
}

/* 8.2 Figure */

.figure {
  max-width: 960px;
  margin: 0 auto 30px;
}

.figure__img {
  display: block;
  width: 100%;
  height: auto;
  padding: clamp(10px, 2.5vw, 28px);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

figcaption {
  margin-top: 10px;
  color: var(--ink-faint);
  font-size: .86rem;
}

figcaption b {
  color: var(--ink-soft);
}

/* 8.3 Flow — architecture pipeline */

.flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch;
  gap: 12px;
}

.flow__step {
  position: relative;
  overflow: hidden;
  padding: 21px 22px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fff;
  cursor: default;
  transition:
    transform .28s var(--ease),
    box-shadow .28s var(--ease),
    border-color .28s var(--ease);
}

.flow__step::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-bc);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}

.flow__step:hover {
  transform: translateY(-4px);
  border-color: rgba(43, 92, 255, .35);
  box-shadow: 0 14px 30px rgba(43, 92, 255, .16);
}

.flow__step:hover::before {
  transform: scaleX(1);
}

.flow__step:hover h3 {
  color: var(--blue-deep);
}

.flow__step:hover p {
  color: var(--ink-soft);
}

.flow__step h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -.012em;
  transition: color .28s var(--ease);
}

.flow__step p {
  margin: 0;
  color: var(--ink-faint);
  font-size: .89rem;
  transition: color .28s var(--ease);
}

.flow__step code {
  color: var(--blue-deep);
  font-family: var(--mono);
  font-size: .84em;
}

.flow__arrow {
  position: relative;
  align-self: center;
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(43, 92, 255, .55), rgba(0, 201, 214, .7));
}

.flow__arrow::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -1px;
  width: 7px;
  height: 7px;
  border-top: 2px solid rgba(0, 170, 182, .8);
  border-right: 2px solid rgba(0, 170, 182, .8);
  border-radius: 1px;
  transform: translateY(-50%) rotate(45deg);
}

/* 8.4 Table */

.tablewrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  font-variant-numeric: tabular-nums;
}

.table caption {
  caption-side: bottom;
  padding: 12px 18px 15px;
  color: var(--ink-faint);
  font-size: .82rem;
  text-align: left;
}

.table th,
.table td {
  padding: 12px 14px;
  text-align: left;
}

.table thead th {
  border-bottom: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.table tbody tr + tr th,
.table tbody tr + tr td {
  border-top: 1px solid var(--line);
}

.table tbody th {
  color: var(--ink);
  font-weight: 600;
}

.table tbody td {
  color: var(--ink-soft);
}

.table .is-ours {
  background: rgba(43, 92, 255, .06);
  color: var(--blue-deep);
}

.table thead .is-ours {
  color: var(--blue);
}

/* every column but the row labels is numeric, so center it */
.table td,
.table thead th:not(:first-child) {
  text-align: center;
}

/* summary column: cyan tint, kept distinct from the blue "ours" row */
.table .is-avg {
  background: rgba(0, 201, 214, .10);
  color: #00727a;
}

.table thead .is-avg {
  color: #00939c;
}

.table .is-ours.is-avg {
  background: rgba(0, 201, 214, .20);
}

.tablewrap + .prose {
  margin-top: 20px;
}

/* 8.6 Code blocks */

.codegrid {
  display: grid;
  grid-template-columns: .92fr 1fr;
  gap: 14px;
  align-items: start;
}

.code {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 11px;
  background: rgba(255, 255, 255, .045);
}

.code--paper {
  border-color: transparent;
  background: #0c0e24;
}

.code__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, .10);
  background: rgba(255, 255, 255, .035);
}

.code__label {
  color: #93a0c8;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .06em;
}

.code pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  color: #dde3f7;
  font-family: var(--mono);
  font-size: .83rem;
  line-height: 1.55;
  tab-size: 2;
}

.code--install pre {
  font-size: .78rem;
}

/* syntax tokens */
.code .k  { color: #6ee7e0; }
.code .c  { color: #8fb0ff; }
.code .s  { color: #a6e3a1; }
.code .n  { color: #ffc98a; }
.code .o  { color: #8d97bd; }
.code .cm { color: #7c87b2; font-style: italic; }

.copy {
  padding: 5px 11px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 999px;
  background: transparent;
  color: #d2d9f2;
  font: inherit;
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.copy:hover {
  background: rgba(255, 255, 255, .12);
  color: #fff;
}

.copy.is-done {
  border-color: var(--cyan-lit);
  color: var(--cyan-lit);
}

/* 8.7 Notice */

.notice {
  margin-top: 22px;
  padding: 19px 21px;
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  border-radius: 10px;
  background:
    linear-gradient(#fff, #fff) padding-box,
    var(--grad-bc) border-box;
}

.split > .notice {
  margin-top: 0;
}

.notice h3 {
  margin: 0 0 5px;
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 600;
}

.notice p a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.notice p {
  margin: 0;
  color: var(--ink-soft);
  font-size: .9rem;
}


/* 9. Footer
   ========================================================================== */

.footer {
  padding: 14px 0;
  border-top: 1px solid var(--line);
  background: var(--paper-warm);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

.footer__brand {
  color: var(--ink);
  font-family: var(--display);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: -.01em;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: .86rem;
}

.footer__links a {
  color: var(--ink-faint);
}

.footer__links a:hover {
  color: var(--blue);
}


/* 10. Motion
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity .7s var(--ease) var(--d, 0ms),
    transform .7s var(--ease) var(--d, 0ms);
}

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


/* 11. Responsive
   ========================================================================== */

/* below this the BibTeX no longer fits beside the notice, so stack instead of scroll */
@media (max-width: 1200px) {
  #citation.section .split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 940px) {
  .split {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  /* two-by-two grid of steps; the in-row arrows no longer point anywhere */
  .flow {
    grid-template-columns: 1fr 1fr;
  }

  .flow__arrow {
    display: none;
  }

  .prose--single {
    white-space: normal;
  }
}

@media (max-width: 560px) {
  .flow {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .flow__arrow {
    display: block;
    justify-self: center;
    width: 2px;
    height: 16px;
    background: linear-gradient(180deg, rgba(43, 92, 255, .55), rgba(0, 201, 214, .7));
  }

  .flow__arrow::after {
    top: auto;
    right: 50%;
    bottom: -1px;
    transform: translateX(50%) rotate(135deg);
  }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .section {
    padding: 44px 0;
  }

  .hero__inner {
    padding: 32px 22px 40px;
  }

  .wrap {
    padding-inline: 22px;
  }

  .footer__inner {
    justify-content: flex-start;
  }
}

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

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

  * {
    transition-duration: .01ms !important;
  }
}