/* ==========================================================================
   SIGNATURESI — RESEARCH ARTICLE
   Deep editorial research layout
   ========================================================================== */

:root {
  color-scheme: light;

  --background: #ffffff;
  --surface: #ffffff;
  --surface-soft: #f7f7f8;
  --surface-muted: #f1f1f3;

  --text-primary: #111113;
  --text-secondary: rgba(60, 60, 67, 0.7);
  --text-tertiary: rgba(60, 60, 67, 0.48);

  --border: rgba(60, 60, 67, 0.13);
  --border-strong: rgba(60, 60, 67, 0.21);

  --dark: #111113;
  --blue: #3478f6;
  --green: #18875f;

  --content-width: 1120px;
  --article-width: 760px;
  --navbar-height: 68px;

  --transition:
    200ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-soft:
    0 1px 2px rgba(0, 0, 0, 0.03),
    0 12px 32px rgba(0, 0, 0, 0.045);

  --shadow-card:
    0 20px 50px rgba(0, 0, 0, 0.055),
    0 2px 8px rgba(0, 0, 0, 0.025);
}

/* RESET */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;

  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Display",
    "Segoe UI",
    sans-serif;

  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: transparent;
}

html {
  min-width: 320px;

  scroll-behavior: smooth;

  scroll-padding-top:
    calc(var(--navbar-height) + 24px);

  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100svh;

  overflow-x: hidden;

  color: var(--text-primary);
  background: var(--background);

  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
}

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

img,
svg {
  flex-shrink: 0;
}

::selection {
  color: #0b2034;

  background:
    rgba(86, 174, 255, 0.28);
}

::-moz-selection {
  color: #0b2034;

  background:
    rgba(86, 174, 255, 0.28);
}

a:focus-visible,
button:focus-visible {
  outline:
    2px solid rgba(0, 122, 255, 0.82);

  outline-offset: 3px;
}

/* NAVIGATION */

.navbar {
  position: fixed;

  top: 0;
  right: 0;
  left: 0;

  z-index: 1000;

  height:
    calc(
      var(--navbar-height) +
      env(safe-area-inset-top)
    );

  padding-top:
    env(safe-area-inset-top);

  background:
    rgba(255, 255, 255, 0.86);

  border-bottom:
    1px solid transparent;

  backdrop-filter:
    saturate(150%) blur(14px);

  -webkit-backdrop-filter:
    saturate(150%) blur(14px);

  transition:
    background-color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.navbar.is-scrolled {
  background:
    rgba(255, 255, 255, 0.96);

  border-bottom-color:
    var(--border);

  box-shadow:
    0 8px 28px
    rgba(0, 0, 0, 0.035);
}

.nav-container {
  width:
    min(var(--content-width), 100%);

  height:
    var(--navbar-height);

  margin: 0 auto;

  padding:
    0
    max(24px, env(safe-area-inset-right))
    0
    max(24px, env(safe-area-inset-left));

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;

  gap: 10px;
}

.brand-icon {
  width: 34px;
  height: 34px;

  overflow: hidden;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  background: var(--dark);

  border-radius: 11px;

  box-shadow:
    0 7px 18px
    rgba(0, 0, 0, 0.12);
}

.brand-icon img {
  width: 100%;
  height: 100%;

  object-fit: contain;

  user-select: none;
  -webkit-user-drag: none;
}

.brand-name {
  font-size: 17px;
  font-weight: 700;

  letter-spacing:
    -0.035em;
}

.nav-links {
  display: flex;
  align-items: center;

  gap: 6px;
}

.nav-link,
.nav-signin {
  min-height: 40px;

  padding: 0 14px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  color:
    var(--text-secondary);

  border-radius: 12px;

  font-size: 13px;
  font-weight: 550;

  transition:
    color var(--transition),
    background-color var(--transition),
    transform var(--transition);
}

.nav-link:hover,
.nav-signin:hover,
.active-link {
  color:
    var(--text-primary);

  background:
    var(--surface-muted);
}

.nav-link:active,
.nav-signin:active {
  transform:
    scale(0.97);
}

/* BUTTONS */

.button {
  min-height: 42px;

  padding: 0 18px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  gap: 8px;

  border:
    1px solid transparent;

  border-radius: 13px;

  font-size: 13px;
  font-weight: 600;

  cursor: pointer;

  transition:
    transform var(--transition),
    background-color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.button-dark {
  color: #ffffff;
  background: var(--dark);

  border-color: var(--dark);

  box-shadow:
    0 8px 20px
    rgba(0, 0, 0, 0.11);
}

.button-dark:hover {
  background: #272729;
  border-color: #272729;
}

.button-soft {
  color:
    var(--text-primary);

  background:
    var(--surface-soft);

  border-color:
    var(--border);
}

.button-soft:hover {
  background:
    var(--surface-muted);

  border-color:
    var(--border-strong);
}

.button-disabled {
  color:
    var(--text-tertiary);

  background:
    var(--surface-muted);

  border-color:
    var(--border);

  cursor: not-allowed;
}

.button:active:not(:disabled) {
  transform:
    scale(0.975);
}

.button svg {
  width: 16px;
  height: 16px;
}

/* ARTICLE HERO */

.article-hero {
  min-height: 730px;

  padding:
    calc(var(--navbar-height) + 105px)
    24px
    110px;

  position: relative;
  isolation: isolate;

  overflow: hidden;

  display: flex;
  align-items: center;
  justify-content: center;

  background:
    radial-gradient(
      circle at 50% 12%,
      #ffffff 0%,
      #f7f9fd 58%,
      #ffffff 100%
    );
}

.article-hero::after {
  content: "";

  position: absolute;

  right: 0;
  bottom: 0;
  left: 0;

  z-index: 3;

  height: 180px;

  background:
    linear-gradient(
      to bottom,
      transparent,
      #ffffff
    );
}

.article-hero-inner {
  width:
    min(900px, 100%);

  position: relative;
  z-index: 5;
}

.back-to-research {
  display: inline-flex;
  align-items: center;

  gap: 7px;

  color:
    var(--text-secondary);

  font-size: 12px;
  font-weight: 600;
}

.back-to-research:hover {
  color:
    var(--text-primary);
}

.back-to-research svg {
  width: 15px;
  height: 15px;

  transition:
    transform var(--transition);
}

.back-to-research:hover svg {
  transform:
    translateX(-3px);
}

.article-label-row {
  margin-top: 35px;

  display: flex;
  align-items: center;
  flex-wrap: wrap;

  gap: 8px;
}

.article-label,
.article-status {
  min-height: 27px;

  padding: 0 10px;

  display: inline-flex;
  align-items: center;

  border-radius: 999px;

  font-size: 10px;
  font-weight: 650;

  letter-spacing:
    0.05em;

  text-transform:
    uppercase;
}

.article-label {
  color: #ffffff;

  background:
    var(--dark);

  border:
    1px solid var(--dark);
}

.article-status {
  color:
    var(--text-secondary);

  background:
    rgba(255, 255, 255, 0.78);

  border:
    1px solid var(--border);
}

.article-hero h1 {
  max-width: 880px;

  margin-top: 25px;

  font-size:
    clamp(52px, 7vw, 82px);

  font-weight: 700;

  line-height: 0.99;

  letter-spacing:
    -0.067em;
}

.article-hero h1 span {
  display: block;

  color:
    var(--text-secondary);
}

.article-summary {
  max-width: 720px;

  margin-top: 27px;

  color:
    var(--text-secondary);

  font-size: 18px;

  line-height: 1.62;
}

.article-meta {
  margin-top: 36px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 30px;
}

.author {
  display: flex;
  align-items: center;

  gap: 11px;
}

.author-icon {
  width: 42px;
  height: 42px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  background:
    var(--surface-soft);

  border:
    1px solid var(--border);

  border-radius: 13px;
}

.author-icon img {
  width: 26px;
  height: 26px;

  object-fit: contain;
}

.author div {
  display: flex;
  flex-direction: column;
}

.author strong {
  font-size: 12.5px;
  font-weight: 650;
}

.author span {
  margin-top: 2px;

  color:
    var(--text-tertiary);

  font-size: 10.5px;
}

.meta-items {
  display: flex;
  align-items: center;
  flex-wrap: wrap;

  gap: 10px;

  color:
    var(--text-tertiary);

  font-size: 10.5px;
  font-weight: 550;
}

.meta-dot {
  width: 3px;
  height: 3px;

  background:
    var(--text-tertiary);

  border-radius: 50%;
}

.article-actions {
  margin-top: 32px;

  display: flex;
  align-items: center;
  flex-wrap: wrap;

  gap: 9px;
}

.hero-glow {
  position: absolute;

  border-radius: 50%;

  pointer-events: none;
}

.hero-glow-one {
  width: 520px;
  height: 520px;

  top: 90px;
  left: calc(50% - 740px);

  background:
    radial-gradient(
      circle,
      rgba(255, 201, 148, 0.28),
      rgba(255, 230, 207, 0.1) 47%,
      transparent 72%
    );
}

.hero-glow-two {
  width: 470px;
  height: 470px;

  right:
    calc(50% - 710px);

  bottom: 25px;

  background:
    radial-gradient(
      circle,
      rgba(148, 202, 255, 0.3),
      rgba(185, 173, 255, 0.12) 48%,
      transparent 72%
    );
}

/* ARTICLE LAYOUT */

.article-section {
  padding:
    20px
    max(24px, env(safe-area-inset-right))
    140px
    max(24px, env(safe-area-inset-left));
}

.article-layout {
  width:
    min(var(--content-width), 100%);

  margin: 0 auto;

  display: grid;

  grid-template-columns:
    220px minmax(0, var(--article-width));

  justify-content: center;
  align-items: start;

  gap: 70px;
}

/* TABLE OF CONTENTS */

.table-of-contents {
  position: sticky;

  top:
    calc(
      var(--navbar-height) +
      28px
    );
}

.toc-card {
  padding: 16px;

  background:
    var(--surface-soft);

  border:
    1px solid var(--border);

  border-radius: 17px;
}

.toc-header {
  min-height: 34px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  color:
    var(--text-tertiary);

  font-size: 10px;
  font-weight: 650;

  letter-spacing:
    0.06em;

  text-transform:
    uppercase;
}

.toc-toggle {
  width: 30px;
  height: 30px;

  display: none;
  align-items: center;
  justify-content: center;

  color:
    var(--text-secondary);

  background:
    var(--surface);

  border:
    1px solid var(--border);

  border-radius: 9px;

  cursor: pointer;
}

.toc-toggle svg {
  width: 15px;
  height: 15px;

  transition:
    transform var(--transition);
}

.toc-toggle[aria-expanded="false"] svg {
  transform:
    rotate(-90deg);
}

.toc-navigation {
  margin-top: 10px;

  display: flex;
  flex-direction: column;

  gap: 3px;
}

.toc-navigation a {
  min-height: 34px;

  padding: 0 10px;

  display: flex;
  align-items: center;

  color:
    var(--text-tertiary);

  border-radius: 9px;

  font-size: 10.5px;
  font-weight: 550;

  transition:
    color var(--transition),
    background-color var(--transition);
}

.toc-navigation a:hover,
.active-toc-link {
  color:
    var(--text-primary) !important;

  background:
    #ffffff;
}

/* ARTICLE CONTENT */

.article-content {
  min-width: 0;
}

.content-section {
  padding:
    78px 0 0;

  display: grid;

  grid-template-columns:
    34px minmax(0, 1fr);

  gap: 20px;
}

.content-section:first-child {
  padding-top: 0;
}

.section-index {
  padding-top: 3px;

  color:
    var(--text-tertiary);

  font-size: 9.5px;
  font-weight: 650;
}

.section-label {
  display: inline-block;

  margin-bottom: 13px;

  color:
    var(--text-tertiary);

  font-size: 10.5px;
  font-weight: 650;

  letter-spacing:
    0.07em;

  text-transform:
    uppercase;
}

.content-section h2 {
  max-width: 700px;

  font-size:
    clamp(32px, 4vw, 45px);

  font-weight: 700;

  line-height: 1.08;

  letter-spacing:
    -0.05em;
}

.content-section p {
  margin-top: 20px;

  color:
    var(--text-secondary);

  font-size: 15px;
  line-height: 1.78;
}

.content-section p + p {
  margin-top: 17px;
}

.abstract-section {
  padding-top: 0;
}

.abstract-text {
  margin-top: 0 !important;

  color:
    var(--text-primary) !important;

  font-size: 18px !important;

  line-height: 1.7 !important;

  letter-spacing:
    -0.012em;
}

.subheading {
  margin-top: 35px;

  font-size: 20px;
  font-weight: 650;

  letter-spacing:
    -0.03em;
}

/* NOTICE */

.research-notice {
  margin:
    38px 0 0 54px;

  padding: 18px;

  display: flex;
  align-items: flex-start;

  gap: 13px;

  background:
    linear-gradient(
      145deg,
      #f8faff,
      #f2f6ff
    );

  border:
    1px solid
    rgba(52, 120, 246, 0.15);

  border-radius: 17px;
}

.notice-icon {
  width: 34px;
  height: 34px;

  flex: 0 0 auto;

  display: flex;
  align-items: center;
  justify-content: center;

  color:
    var(--blue);

  background:
    rgba(52, 120, 246, 0.08);

  border-radius: 10px;
}

.notice-icon svg {
  width: 17px;
  height: 17px;
}

.research-notice strong {
  font-size: 12.5px;
  font-weight: 650;
}

.research-notice p {
  margin-top: 5px;

  color:
    var(--text-secondary);

  font-size: 12px;
  line-height: 1.62;
}

/* QUESTION CARD */

.question-card {
  margin-top: 28px;

  padding: 23px;

  background:
    var(--dark);

  border-radius: 20px;

  box-shadow:
    0 18px 42px
    rgba(0, 0, 0, 0.16);
}

.question-card span {
  color:
    rgba(255, 255, 255, 0.45);

  font-size: 9.5px;
  font-weight: 650;

  letter-spacing:
    0.08em;

  text-transform:
    uppercase;
}

.question-card strong {
  display: block;

  margin-top: 12px;

  color: #ffffff;

  font-size: 19px;
  font-weight: 600;

  line-height: 1.45;

  letter-spacing:
    -0.025em;
}

/* PRINCIPLES */

.principles-grid {
  margin-top: 30px;

  display: grid;

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

  gap: 12px;
}

.principle-card {
  min-height: 190px;

  padding: 20px;

  background:
    var(--surface-soft);

  border:
    1px solid var(--border);

  border-radius: 18px;
}

.principle-number {
  width: 33px;
  height: 33px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  color:
    var(--text-tertiary);

  background:
    #ffffff;

  border:
    1px solid var(--border);

  border-radius: 10px;

  font-size: 9.5px;
  font-weight: 650;
}

.principle-card h3 {
  margin-top: 25px;

  font-size: 15px;
  font-weight: 650;

  letter-spacing:
    -0.025em;
}

.principle-card p {
  margin-top: 8px;

  font-size: 12px;
  line-height: 1.62;
}

/* ARCHITECTURE DIAGRAM */

.architecture-diagram {
  margin-top: 32px;

  padding: 20px;

  overflow: hidden;

  background:
    linear-gradient(
      145deg,
      #111216,
      #1a1c22
    );

  border:
    1px solid
    rgba(255, 255, 255, 0.08);

  border-radius: 22px;

  box-shadow:
    0 24px 60px
    rgba(0, 0, 0, 0.17);
}

.diagram-header,
.diagram-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.diagram-brand {
  display: flex;
  align-items: center;

  gap: 9px;

  color: #ffffff;

  font-size: 11.5px;
  font-weight: 650;
}

.diagram-brand img {
  width: 28px;
  height: 28px;

  object-fit: contain;
}

.diagram-status {
  min-height: 24px;

  padding: 0 9px;

  display: inline-flex;
  align-items: center;

  color:
    rgba(255, 255, 255, 0.6);

  background:
    rgba(255, 255, 255, 0.07);

  border:
    1px solid
    rgba(255, 255, 255, 0.09);

  border-radius: 999px;

  font-size: 9px;
  font-weight: 650;

  text-transform:
    uppercase;
}

.diagram-canvas {
  min-height: 430px;

  position: relative;
}

.diagram-node {
  position: absolute;

  min-width: 105px;
  min-height: 48px;

  padding: 8px 13px;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  color:
    rgba(255, 255, 255, 0.82);

  background:
    rgba(255, 255, 255, 0.075);

  border:
    1px solid
    rgba(255, 255, 255, 0.11);

  border-radius: 14px;

  text-align: center;
}

.diagram-node strong {
  font-size: 11px;
  font-weight: 650;
}

.diagram-node span {
  margin-top: 3px;

  color:
    rgba(255, 255, 255, 0.45);

  font-size: 8.5px;
}

.input-node {
  top: 24px;
  left: 50%;

  transform:
    translateX(-50%);
}

.core-node {
  width: 150px;
  height: 150px;

  top: 50%;
  left: 50%;

  transform:
    translate(-50%, -50%);

  border-radius: 50%;

  background:
    radial-gradient(
      circle at 35% 30%,
      rgba(255, 255, 255, 0.24),
      rgba(255, 255, 255, 0.07)
    );

  box-shadow:
    0 22px 50px
    rgba(0, 0, 0, 0.27);
}

.core-node strong {
  color: #ffffff;

  font-size: 14px;
}

.core-node span {
  max-width: 110px;

  line-height: 1.4;
}

.memory-node {
  top: 58%;
  left: 4%;
}

.language-node {
  top: 58%;
  right: 4%;
}

.retrieval-node {
  right: 50%;
  bottom: 27px;

  transform:
    translateX(50%);
}

.output-node {
  top: 24px;
  right: 4%;
}

.diagram-line {
  position: absolute;

  height: 1px;

  background:
    linear-gradient(
      to right,
      transparent,
      rgba(255, 255, 255, 0.24),
      transparent
    );

  transform-origin:
    left center;
}

.input-line {
  width: 105px;

  top: 100px;
  left: 50%;

  transform:
    translateX(-50%)
    rotate(90deg);
}

.output-line {
  width: 150px;

  top: 114px;
  right: 110px;

  transform:
    rotate(145deg);
}

.line-memory {
  width: 150px;

  top: 235px;
  left: 142px;

  transform:
    rotate(165deg);
}

.line-language {
  width: 150px;

  top: 235px;
  right: 142px;

  transform:
    rotate(15deg);
}

.line-retrieval {
  width: 100px;

  bottom: 105px;
  left: 50%;

  transform:
    translateX(-50%)
    rotate(90deg);
}

.diagram-footer {
  padding-top: 14px;

  border-top:
    1px solid
    rgba(255, 255, 255, 0.08);

  color:
    rgba(255, 255, 255, 0.45);

  font-size: 9.5px;
}

/* MEMORY TABLE */

.memory-table-wrapper {
  margin-top: 30px;

  overflow-x: auto;

  border:
    1px solid var(--border);

  border-radius: 17px;
}

.memory-table {
  width: 100%;

  min-width: 650px;

  border-collapse: collapse;

  background: #ffffff;
}

.memory-table th,
.memory-table td {
  padding: 15px 17px;

  border-bottom:
    1px solid var(--border);

  text-align: left;
  vertical-align: top;
}

.memory-table th {
  color:
    var(--text-tertiary);

  background:
    var(--surface-soft);

  font-size: 9.5px;
  font-weight: 650;

  letter-spacing:
    0.06em;

  text-transform:
    uppercase;
}

.memory-table td {
  color:
    var(--text-secondary);

  font-size: 11.5px;
  line-height: 1.5;
}

.memory-table td:first-child {
  color:
    var(--text-primary);

  font-weight: 600;
}

.memory-table tr:last-child td {
  border-bottom: 0;
}

/* LANGUAGE */

.language-example {
  margin-top: 30px;

  display: grid;

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

  overflow: hidden;

  border:
    1px solid var(--border);

  border-radius: 18px;
}

.language-input,
.language-output {
  min-height: 150px;

  padding: 20px;
}

.language-input {
  background:
    var(--dark);

  color: #ffffff;
}

.language-output {
  background:
    var(--surface-soft);
}

.language-example span {
  color:
    var(--text-tertiary);

  font-size: 9px;
  font-weight: 650;

  letter-spacing:
    0.07em;

  text-transform:
    uppercase;
}

.language-input span {
  color:
    rgba(255, 255, 255, 0.45);
}

.language-example p {
  margin-top: 17px;

  color:
    var(--text-primary);

  font-size: 14px;
  line-height: 1.55;
}

.language-input p {
  color: #ffffff;
}

/* METRICS */

.metric-grid {
  margin-top: 30px;

  display: grid;

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

  gap: 11px;
}

.metric-card {
  min-height: 170px;

  padding: 18px;

  background:
    var(--surface-soft);

  border:
    1px solid var(--border);

  border-radius: 17px;
}

.metric-card > span {
  color:
    var(--text-tertiary);

  font-size: 9px;
  font-weight: 650;

  letter-spacing:
    0.07em;

  text-transform:
    uppercase;
}

.metric-card strong {
  display: block;

  margin-top: 22px;

  font-size: 14px;
  font-weight: 650;

  letter-spacing:
    -0.025em;
}

.metric-card p {
  margin-top: 8px;

  font-size: 11px;
  line-height: 1.55;
}

/* HYPOTHESES */

.hypothesis-list {
  margin-top: 28px;

  display: flex;
  flex-direction: column;

  gap: 9px;
}

.hypothesis-list article {
  padding: 18px;

  display: grid;

  grid-template-columns:
    35px minmax(0, 1fr);

  align-items: start;

  gap: 13px;

  background:
    var(--surface-soft);

  border:
    1px solid var(--border);

  border-radius: 15px;
}

.hypothesis-list span {
  width: 35px;
  height: 35px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  color:
    var(--text-tertiary);

  background:
    #ffffff;

  border:
    1px solid var(--border);

  border-radius: 10px;

  font-size: 9.5px;
  font-weight: 650;
}

.hypothesis-list p {
  margin-top: 5px;

  font-size: 12.5px;
  line-height: 1.62;
}

/* LIST */

.article-list {
  margin-top: 27px;

  display: flex;
  flex-direction: column;

  gap: 12px;

  list-style: none;
}

.article-list li {
  padding-left: 22px;

  position: relative;

  color:
    var(--text-secondary);

  font-size: 14px;
  line-height: 1.68;
}

.article-list li::before {
  content: "";

  width: 6px;
  height: 6px;

  position: absolute;

  top: 9px;
  left: 0;

  background:
    var(--text-primary);

  border-radius: 50%;
}

/* SAFETY */

.safety-grid {
  margin-top: 30px;

  display: grid;

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

  gap: 11px;
}

.safety-grid article {
  min-height: 155px;

  padding: 19px;

  background:
    linear-gradient(
      145deg,
      #ffffff,
      #f7f9fd
    );

  border:
    1px solid var(--border);

  border-radius: 17px;
}

.safety-grid strong {
  font-size: 13px;
  font-weight: 650;
}

.safety-grid p {
  margin-top: 9px;

  font-size: 11.5px;
  line-height: 1.58;
}

/* ROADMAP */

.future-roadmap {
  margin-top: 30px;

  display: flex;
  flex-direction: column;

  gap: 1px;

  overflow: hidden;

  border:
    1px solid var(--border);

  border-radius: 18px;
}

.future-roadmap article {
  padding: 19px;

  display: grid;

  grid-template-columns:
    76px minmax(0, 1fr);

  gap: 18px;

  background:
    #ffffff;

  border-bottom:
    1px solid var(--border);
}

.future-roadmap article:last-child {
  border-bottom: 0;
}

.future-roadmap article > span {
  color:
    var(--text-tertiary);

  font-size: 9.5px;
  font-weight: 650;

  letter-spacing:
    0.06em;

  text-transform:
    uppercase;
}

.future-roadmap strong {
  font-size: 13px;
  font-weight: 650;
}

.future-roadmap p {
  margin-top: 6px;

  font-size: 11.5px;
  line-height: 1.58;
}

/* DOWNLOAD */

.download-section {
  margin-top: 80px;

  padding: 28px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 30px;

  background:
    linear-gradient(
      145deg,
      #f3f4f6,
      #fbfbfc
    );

  border:
    1px solid var(--border);

  border-radius: 21px;
}

.download-section h2 {
  max-width: 500px;

  font-size: 27px;
  font-weight: 700;

  line-height: 1.12;

  letter-spacing:
    -0.045em;
}

.download-section p {
  max-width: 520px;

  margin-top: 11px;

  color:
    var(--text-secondary);

  font-size: 12.5px;
  line-height: 1.6;
}

/* REFERENCES */

.reference-list {
  margin-top: 28px;

  padding-left: 22px;
}

.reference-list li {
  padding-left: 8px;

  color:
    var(--text-secondary);

  font-size: 13px;
  line-height: 1.68;
}

.reference-list li + li {
  margin-top: 12px;
}

/* CITATION */

.citation-section {
  margin-top: 78px;

  padding-top: 36px;

  border-top:
    1px solid var(--border);
}

.citation-box {
  margin-top: 10px;

  padding: 15px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 20px;

  background:
    var(--surface-soft);

  border:
    1px solid var(--border);

  border-radius: 15px;
}

.citation-box code {
  color:
    var(--text-secondary);

  font-family:
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;

  font-size: 10.5px;
  line-height: 1.55;
}

.citation-copy {
  min-height: 34px;

  padding: 0 12px;

  flex: 0 0 auto;

  color:
    var(--text-primary);

  background:
    #ffffff;

  border:
    1px solid var(--border);

  border-radius: 10px;

  cursor: pointer;

  font-size: 10.5px;
  font-weight: 650;
}

/* RELATED */

.related-section {
  padding:
    110px
    max(24px, env(safe-area-inset-right))
    130px
    max(24px, env(safe-area-inset-left));

  background:
    var(--surface-soft);
}

.related-inner {
  width:
    min(var(--content-width), 100%);

  margin: 0 auto;
}

.related-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;

  gap: 30px;
}

.related-header h2 {
  font-size:
    clamp(36px, 5vw, 52px);

  font-weight: 700;

  line-height: 1.07;

  letter-spacing:
    -0.055em;
}

.view-all-link {
  display: inline-flex;
  align-items: center;

  gap: 8px;

  color:
    var(--text-secondary);

  font-size: 12px;
  font-weight: 600;
}

.view-all-link:hover {
  color:
    var(--text-primary);
}

.view-all-link svg {
  width: 15px;
  height: 15px;
}

.related-grid {
  margin-top: 42px;

  display: grid;

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

  gap: 15px;
}

.related-card {
  min-height: 280px;

  padding: 22px;

  display: flex;
  flex-direction: column;

  background:
    #ffffff;

  border:
    1px solid var(--border);

  border-radius: 21px;

  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.related-card:hover {
  transform:
    translateY(-3px);

  border-color:
    var(--border-strong);

  box-shadow:
    var(--shadow-card);
}

.related-type {
  color:
    var(--text-tertiary);

  font-size: 9.5px;
  font-weight: 650;

  letter-spacing:
    0.06em;

  text-transform:
    uppercase;
}

.related-card h3 {
  margin-top: 35px;

  font-size: 19px;
  font-weight: 650;

  line-height: 1.18;

  letter-spacing:
    -0.035em;
}

.related-card p {
  margin-top: 12px;

  color:
    var(--text-secondary);

  font-size: 12px;
  line-height: 1.6;
}

.related-status {
  margin-top: auto;
  padding-top: 25px;

  color:
    var(--text-tertiary);

  font-size: 9.5px;
  font-weight: 550;
}

.green-card {
  background:
    linear-gradient(
      145deg,
      #ffffff,
      #f4fbf7
    );
}

.purple-card {
  background:
    linear-gradient(
      145deg,
      #ffffff,
      #f8f5ff
    );
}

/* FOOTER */

.footer {
  padding:
    74px
    max(24px, env(safe-area-inset-right))
    max(28px, env(safe-area-inset-bottom))
    max(24px, env(safe-area-inset-left));

  background:
    #111113;

  color: #ffffff;
}

.footer-main {
  width:
    min(var(--content-width), 100%);

  margin: 0 auto;

  display: grid;

  grid-template-columns:
    1.5fr repeat(5, 1fr);

  gap: 38px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;

  gap: 10px;

  font-size: 16px;
  font-weight: 700;
}

.footer-brand img {
  width: 34px;
  height: 34px;

  object-fit: contain;

  border-radius: 10px;
}

.footer-brand-column p {
  max-width: 230px;

  margin-top: 18px;

  color:
    rgba(255, 255, 255, 0.52);

  font-size: 11.5px;
  line-height: 1.6;
}

.footer-column {
  display: flex;
  flex-direction: column;

  gap: 12px;
}

.footer-column h3 {
  margin-bottom: 4px;

  color:
    rgba(255, 255, 255, 0.45);

  font-size: 10px;
  font-weight: 650;

  letter-spacing:
    0.07em;

  text-transform:
    uppercase;
}

.footer-column a {
  color:
    rgba(255, 255, 255, 0.72);

  font-size: 11.5px;
  font-weight: 500;

  transition:
    color var(--transition);
}

.footer-column a:hover {
  color: #ffffff;
}

.footer-bottom {
  width:
    min(var(--content-width), 100%);

  margin:
    65px auto 0;

  padding-top: 23px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  border-top:
    1px solid
    rgba(255, 255, 255, 0.11);

  color:
    rgba(255, 255, 255, 0.45);

  font-size: 10.5px;
}

.footer-meta {
  display: flex;
  align-items: center;

  gap: 20px;
}

.footer-meta a,
.footer-meta button {
  color:
    rgba(255, 255, 255, 0.55);

  background:
    transparent;

  cursor: pointer;

  font-size: 10.5px;
}

.footer-meta a:hover,
.footer-meta button:hover {
  color: #ffffff;
}

/* TOAST */

.toast {
  position: fixed;

  right: 22px;
  bottom:
    max(
      22px,
      env(safe-area-inset-bottom)
    );

  z-index: 2000;

  min-height: 42px;

  padding: 0 16px;

  display: flex;
  align-items: center;

  color: #ffffff;

  background:
    rgba(17, 17, 19, 0.94);

  border:
    1px solid
    rgba(255, 255, 255, 0.1);

  border-radius: 12px;

  box-shadow:
    0 12px 30px
    rgba(0, 0, 0, 0.18);

  opacity: 0;

  transform:
    translateY(10px);

  pointer-events: none;

  font-size: 11.5px;
  font-weight: 600;

  transition:
    opacity var(--transition),
    transform var(--transition);
}

.show-toast {
  opacity: 1;

  transform:
    translateY(0);
}

/* TABLET */

@media (max-width: 1000px) {
  .article-layout {
    grid-template-columns:
      190px minmax(0, 1fr);

    gap: 45px;
  }

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

  .footer-brand-column {
    grid-column:
      1 / -1;
  }
}

/* MOBILE */

@media (max-width: 760px) {
  :root {
    --navbar-height: 60px;
  }

  .nav-container {
    padding-right: 15px;
    padding-left: 15px;

    gap: 10px;
  }

  .brand-icon {
    width: 29px;
    height: 29px;

    border-radius: 9px;
  }

  .brand-name {
    font-size: 15px;
  }

  .nav-link {
    display: none;
  }

  .nav-signin {
    min-height: 36px;

    padding: 0 9px;

    font-size: 11.5px;
  }

  .nav-cta {
    min-height: 36px;

    padding: 0 12px;

    border-radius: 11px;

    font-size: 11.5px;
  }

  .article-hero {
    min-height: auto;

    padding:
      calc(var(--navbar-height) + 82px)
      17px
      92px;
  }

  .article-hero h1 {
    font-size:
      clamp(43px, 13vw, 60px);

    line-height: 1;
  }

  .article-summary {
    margin-top: 22px;

    font-size: 15px;
  }

  .article-meta {
    margin-top: 30px;

    flex-direction: column;
    align-items: flex-start;

    gap: 18px;
  }

  .article-actions {
    width: 100%;
  }

  .article-actions .button {
    flex: 1 1 auto;
  }

  .hero-glow-one {
    width: 290px;
    height: 290px;

    left: -180px;
  }

  .hero-glow-two {
    width: 270px;
    height: 270px;

    right: -170px;
  }

  .article-section {
    padding:
      15px
      16px
      100px;
  }

  .article-layout {
    grid-template-columns: 1fr;

    gap: 30px;
  }

  .table-of-contents {
    position: static;
  }

  .toc-card {
    padding: 13px;

    border-radius: 15px;
  }

  .toc-toggle {
    display: inline-flex;
  }

  .toc-navigation {
    overflow: hidden;

    max-height: 600px;

    transition:
      max-height var(--transition),
      opacity var(--transition),
      margin var(--transition);
  }

  .toc-collapsed {
    max-height: 0;

    margin-top: 0;

    opacity: 0;
  }

  .content-section {
    padding-top: 65px;

    grid-template-columns:
      27px minmax(0, 1fr);

    gap: 13px;
  }

  .content-section h2 {
    font-size: 33px;
  }

  .content-section p {
    font-size: 13.5px;
    line-height: 1.7;
  }

  .abstract-text {
    font-size: 16px !important;
  }

  .research-notice {
    margin-left: 40px;
  }

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

  .architecture-diagram {
    padding: 16px;

    border-radius: 19px;
  }

  .diagram-canvas {
    min-height: 390px;
  }

  .core-node {
    width: 125px;
    height: 125px;
  }

  .memory-node {
    left: 0;
  }

  .language-node {
    right: 0;
  }

  .output-node {
    right: 0;
  }

  .line-memory,
  .line-language {
    width: 115px;
  }

  .language-example {
    grid-template-columns: 1fr;
  }

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

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

  .download-section {
    padding: 23px;

    flex-direction: column;
    align-items: flex-start;
  }

  .citation-box {
    align-items: flex-start;

    flex-direction: column;
  }

  .related-section {
    padding:
      90px
      16px
      100px;
  }

  .related-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .related-grid {
    grid-template-columns: 1fr;

    gap: 12px;
  }

  .footer {
    padding:
      60px
      20px
      max(
        28px,
        env(safe-area-inset-bottom)
      );
  }

  .footer-main {
    grid-template-columns:
      repeat(2, 1fr);

    gap: 38px 24px;
  }

  .footer-brand-column {
    grid-column:
      1 / -1;
  }

  .footer-bottom {
    margin-top: 50px;

    flex-direction: column;
    align-items: flex-start;

    gap: 17px;
  }

  .footer-meta {
    flex-wrap: wrap;

    gap: 14px;
  }

  .toast {
    right: 16px;
    bottom:
      max(
        16px,
        env(safe-area-inset-bottom)
      );
  }
}

/* SMALL MOBILE */

@media (max-width: 420px) {
  .brand-name {
    font-size: 14px;
  }

  .nav-signin {
    font-size: 11px;
  }

  .nav-cta {
    padding: 0 10px;
  }

  .article-hero {
    padding-right: 14px;
    padding-left: 14px;
  }

  .article-hero h1 {
    font-size: 41px;
  }

  .article-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .article-actions .button {
    width: 100%;
  }

  .research-notice {
    margin-left: 0;
  }

  .content-section {
    grid-template-columns: 1fr;
  }

  .section-index {
    display: none;
  }

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

  .future-roadmap article {
    grid-template-columns: 1fr;

    gap: 8px;
  }

  .diagram-node {
    min-width: 84px;

    padding-right: 9px;
    padding-left: 9px;
  }

  .core-node {
    width: 112px;
    height: 112px;
  }

  .diagram-line {
    opacity: 0.55;
  }

  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-brand-column {
    grid-column: auto;
  }
}

/* TOUCH */

@media (hover: none),
(pointer: coarse) {
  .related-card:hover {
    transform: none;

    box-shadow: none;
  }

  .related-card:active {
    transform:
      scale(0.992);
  }
}

/* REDUCED MOTION */

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

  *,
  *::before,
  *::after {
    animation-duration:
      0.01ms !important;

    animation-iteration-count:
      1 !important;

    transition-duration:
      0.01ms !important;
  }

  .navbar {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}