:root {
  --background: #ffffff;
  --surface: #f7f8fb;
  --surface-blue: #eaf0ff;
  --ink: #1a1a1f;
  --muted: #5b6170;
  --line: #e6e8ee;
  --accent: #2f6df6;
  --communication: #168ca8;
  --compute: #b87316;
  --cost: #21845b;
  --danger: #b42318;
  --max-width: 980px;
  --reading-width: 760px;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

button,
input,
select {
  font: inherit;
}

a {
  color: var(--accent);
}

a:hover {
  text-decoration-thickness: 2px;
  text-underline-offset: 0.18em;
}

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

section[id] {
  scroll-margin-top: 72px;
}

.paper-wrap {
  width: min(calc(100% - 48px), var(--max-width));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.paper-hero {
  padding: 68px 0 38px;
  text-align: center;
  background:
    radial-gradient(
      900px 280px at 50% -40px,
      var(--surface-blue),
      transparent 72%
    );
  border-bottom: 1px solid var(--line);
}

.project-badge {
  display: inline-block;
  padding: 5px 12px;
  color: var(--accent);
  background: var(--surface-blue);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.paper-hero h1 {
  max-width: 900px;
  margin: 18px auto 10px;
  font-size: clamp(2rem, 4.6vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.paper-hero h1 span {
  display: block;
  color: var(--accent);
}

.paper-subtitle {
  max-width: 720px;
  margin: 0 auto 22px;
  color: var(--muted);
  font-size: 1.12rem;
}

.paper-authors,
.paper-affiliation,
.paper-venue {
  margin: 0.2rem auto;
}

.paper-authors {
  font-size: 1.04rem;
}

.paper-affiliation,
.paper-venue {
  color: var(--muted);
  font-size: 0.92rem;
}

.paper-venue {
  font-style: italic;
}

.resource-links,
.preset-buttons,
.figure-filters,
.citation-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
}

.resource-links {
  margin-top: 24px;
}

.button,
.preset-buttons button,
.figure-filters button,
.figure-expand,
#copy-scenario,
#copy-citation,
#figure-dialog-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.12s ease,
    background 0.12s ease,
    border-color 0.12s ease;
}

.button:hover,
.preset-buttons button:hover,
.figure-filters button:hover,
.figure-expand:hover,
#copy-scenario:hover,
#copy-citation:hover,
#figure-dialog-close:hover {
  background: var(--surface);
  text-decoration: none;
  transform: translateY(-1px);
}

.button-primary,
.preset-buttons button[aria-pressed="true"],
.figure-filters button[aria-pressed="true"] {
  color: #fff;
  background: var(--ink);
  border-color: var(--ink);
}

.button-primary:hover,
.preset-buttons button[aria-pressed="true"]:hover,
.figure-filters button[aria-pressed="true"]:hover {
  color: #fff;
  background: #000;
}

.opening-section {
  padding: 42px 0 30px;
}

.overview-media a {
  display: block;
  padding: clamp(12px, 2.5vw, 24px);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.overview-media img {
  width: 100%;
  max-height: 520px;
  object-fit: contain;
}

.overview-media p {
  max-width: var(--reading-width);
  margin: 12px auto 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

.paper-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 28px 0 0;
}

.paper-facts div {
  padding: 18px 12px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.paper-facts dt {
  color: var(--accent);
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.paper-facts dd {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.paper-nav {
  position: sticky;
  z-index: 20;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  border-block: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.paper-nav-inner {
  display: flex;
  width: min(calc(100% - 48px), var(--max-width));
  margin-inline: auto;
  overflow-x: auto;
  scrollbar-width: thin;
}

.paper-nav a {
  flex: 0 0 auto;
  padding: 13px 14px 11px;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
}

.paper-nav a[aria-current="location"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.article-section {
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
}

.section-heading {
  max-width: 720px;
  margin: 0 auto 30px;
  text-align: center;
}

.section-heading > div {
  display: contents;
}

.section-heading h2,
.answer-section h2,
.citation-section h2 {
  margin: 0 0 8px;
  font-size: clamp(1.65rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.section-heading > p {
  margin: 0;
  color: var(--muted);
}

.section-kicker,
.result-eyebrow {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.answer-section .paper-wrap {
  max-width: var(--reading-width);
  text-align: center;
}

.answer-lead {
  margin: 0;
  color: #33384a;
  font-size: 1.05rem;
}

.answer-note {
  margin: 24px 0 0;
  padding: 18px 20px;
  color: #25375f;
  background: var(--surface-blue);
  border: 1px solid #d8e2ff;
  border-radius: var(--radius);
}

.answer-note span {
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.answer-note p {
  margin: 4px 0 0;
}

.gate-stories,
.strategy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.gate-story,
.strategy-card,
.simulator-shell,
.scenario-result,
.figure-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: none;
}

.gate-story,
.strategy-card {
  padding: 22px;
}

.gate-story {
  display: flex;
  flex-direction: column;
}

.gate-story.communication {
  border-top: 3px solid var(--communication);
}

.gate-story.compute {
  border-top: 3px solid var(--compute);
}

.gate-story.cost {
  border-top: 3px solid var(--cost);
}

.gate-label {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.gate-story h3,
.strategy-card h3 {
  margin: 14px 0 8px;
  font-size: 1.12rem;
  line-height: 1.3;
}

.gate-story > p:not(.gate-label),
.strategy-card > p:last-child {
  color: #3d4251;
  font-size: 0.92rem;
}

.gate-takeaway {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.gate-story > a {
  margin-top: auto;
  padding-top: 12px;
  font-size: 0.86rem;
  font-weight: 700;
}

.roofline-section {
  background: var(--surface);
}

.roofline-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.9fr);
  gap: 28px;
  align-items: start;
}

.roofline-copy {
  max-width: var(--reading-width);
}

.roofline-copy > p {
  margin: 0 0 14px;
  color: var(--muted);
}

.roofline-lead {
  color: var(--ink) !important;
  font-size: 1.05rem;
}

.roofline-definition {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--surface-blue);
  border: 1px solid #d8e2ff;
  border-radius: var(--radius);
}

.roofline-definition strong {
  color: var(--accent);
}

.roofline-definition p {
  margin: 4px 0 0;
}

.roofline-visual {
  display: block;
  overflow: hidden;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}

.roofline-visual:hover {
  border-color: #a9bce8;
  text-decoration: none;
}

.roofline-visual:focus-visible {
  outline: 3px solid rgba(47, 109, 246, 0.3);
  outline-offset: 3px;
}

.roofline-visual img {
  width: 100%;
  min-height: 260px;
  padding: 18px;
  object-fit: contain;
  background: #fff;
}

.roofline-visual span {
  display: block;
  padding: 14px 16px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  line-height: 1.55;
}

.roofline-visual strong {
  color: var(--ink);
}

.roofline-numbers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 28px 0 0;
}

.roofline-numbers div {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
}

.roofline-numbers dt {
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.roofline-numbers dd {
  margin: 0;
}

.roofline-numbers dd strong,
.roofline-numbers dd span {
  display: block;
}

.roofline-numbers dd span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.8rem;
}

.roofline-scope,
.roofline-result {
  max-width: var(--reading-width);
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.roofline-result {
  color: #33384a;
}

.simulator-section {
  background: #fbfcff;
}

.simulator-shell {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 22px;
  padding: clamp(18px, 3vw, 30px);
  background: #fff;
}

#scenario-form fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

#scenario-form legend {
  padding: 0;
  font-weight: 800;
}

.preset-picker {
  padding-bottom: 20px;
  margin: 18px 0 22px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}

.preset-picker > p:first-child {
  margin: 0 0 10px;
  font-size: 0.84rem;
  font-weight: 750;
}

.preset-buttons {
  justify-content: flex-start;
}

.preset-buttons button {
  padding-inline: 0.75rem;
  font-size: 0.76rem;
}

#preset-description {
  min-height: 2.8em;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: left;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.control-grid label,
.year-control {
  display: grid;
  gap: 6px;
  color: #33384a;
  font-size: 0.8rem;
  font-weight: 700;
}

select {
  width: 100%;
  min-height: 44px;
  padding: 0.55rem 2rem 0.55rem 0.7rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid #cfd3dd;
  border-radius: 9px;
}

.year-control {
  margin-top: 18px;
}

.year-control span {
  display: flex;
  justify-content: space-between;
}

.year-control output {
  color: var(--accent);
}

input[type="range"] {
  width: 100%;
  min-height: 44px;
  accent-color: var(--accent);
}

.form-note,
.noscript-note {
  color: var(--muted);
  font-size: 0.78rem;
}

.form-note {
  margin: 8px 0 0;
}

.noscript-note {
  max-width: var(--reading-width);
  margin: 18px auto 0;
  padding: 14px 16px;
  background: #fff8e7;
  border: 1px solid #efd59f;
  border-radius: 10px;
}

.scenario-result {
  padding: 22px;
}

.result-intro h3 {
  margin: 0;
  font-size: 1.28rem;
  line-height: 1.3;
}

#scenario-selection {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.scenario-share {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 15px;
}

#scenario-link-status,
#citation-status {
  min-height: 1.4em;
  color: var(--muted);
  font-size: 0.76rem;
}

.result-gates {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.gate-result {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 10px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--line);
  border-radius: 10px;
}

.gate-result[data-state="pass"] {
  border-top-color: var(--cost);
}

.gate-result[data-state="fail"] {
  border-top-color: var(--danger);
}

.gate-result[data-state="blocked"] {
  opacity: 0.64;
}

.gate-result > span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
}

.gate-result p,
.gate-status {
  margin: 0;
}

.gate-result p {
  font-size: 0.76rem;
  font-weight: 750;
  text-transform: uppercase;
}

.gate-status {
  display: block;
  font-size: 0.94rem;
}

.gate-detail {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  line-height: 1.5;
}

.scenario-caveats {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.strategy-card {
  text-align: center;
}

.strategy-card.recommended {
  background: var(--surface-blue);
  border-color: #d8e2ff;
}

.strategy-code {
  margin: 0;
  color: var(--accent);
  font-weight: 800;
}

.strategy-code span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 650;
}

.strategy-metric {
  margin: 10px 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.strategy-metric strong {
  color: var(--ink);
  font-size: 1.6rem;
}

.strategy-table-wrap {
  margin-top: 20px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: #fff;
}

caption {
  padding: 14px 16px;
  text-align: left;
  font-weight: 750;
}

th,
td {
  padding: 0.75rem 0.9rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  text-align: left;
}

thead th {
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.figures-section {
  background: #fbfcff;
}

.figure-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 20px;
}

.figure-filters {
  justify-content: flex-start;
}

#figure-filter-status {
  flex: 0 0 auto;
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.figure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.figure-card {
  display: flex;
  flex-direction: column;
  margin: 0;
  overflow: hidden;
  background: #fff;
}

.figure-card[hidden] {
  display: none;
}

.figure-card:target {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.figure-wide {
  grid-column: auto;
}

.figure-image-link {
  display: grid;
  min-height: 300px;
  padding: 18px;
  place-items: center;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.figure-image-link img {
  width: 100%;
  max-height: 480px;
  object-fit: contain;
}

.figure-expand {
  display: none;
  align-self: flex-end;
  margin: 10px 16px 0;
  color: var(--accent);
  border-color: #cbd8ff;
}

.has-js .figure-expand {
  display: inline-flex;
}

.figure-card figcaption,
.figure-why {
  padding-inline: 18px;
}

.figure-card figcaption {
  padding-top: 16px;
  color: var(--muted);
  font-size: 0.82rem;
}

.figure-card figcaption strong,
.figure-why strong {
  color: var(--ink);
}

.figure-why {
  margin: 14px 0 0;
  padding-top: 14px;
  padding-bottom: 18px;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
}

#figure-dialog {
  width: min(1100px, calc(100% - 32px));
  max-height: calc(100% - 32px);
  padding: 0;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(26, 26, 31, 0.06);
}

#figure-dialog::backdrop {
  background: rgba(26, 26, 31, 0.72);
}

.figure-dialog-shell {
  display: grid;
  gap: 14px;
  padding: clamp(16px, 3vw, 28px);
}

#figure-dialog-close {
  justify-self: end;
}

#figure-dialog-title {
  margin: 0;
}

#figure-dialog-image {
  width: 100%;
  max-height: 68vh;
  object-fit: contain;
}

#figure-dialog-caption {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.finding-list {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.finding-list li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.finding-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.finding-list li > span {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
}

.finding-list strong {
  font-size: 1.05rem;
}

.finding-list p {
  margin: 4px 0 0;
  color: var(--muted);
}

.citation-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: 34px;
  align-items: start;
}

.citation-layout > div:first-child > p:not(.section-kicker) {
  color: var(--muted);
}

.citation-actions {
  justify-content: flex-start;
  margin-top: 20px;
}

.bibtex-card {
  min-width: 0;
  padding: 20px;
  color: #e9ecf3;
  background: #14161c;
  border-radius: var(--radius);
}

.bibtex-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.bibtex-heading p {
  margin: 0;
  font-weight: 750;
}

#copy-citation {
  color: #fff;
  background: transparent;
  border-color: #4e5360;
}

#bibtex {
  margin: 16px 0 0;
  overflow-x: auto;
  color: inherit;
  font: 0.78rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre;
}

.article-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  width: min(calc(100% - 48px), var(--max-width));
  margin-inline: auto;
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 0.82rem;
}

.article-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .simulator-shell {
    grid-template-columns: 1fr;
  }

  .roofline-layout {
    grid-template-columns: 1fr;
  }

  .gate-stories,
  .strategy-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .paper-wrap,
  .paper-nav-inner,
  .article-footer {
    width: min(calc(100% - 32px), var(--max-width));
  }

  .paper-hero {
    padding-top: 48px;
  }

  .paper-hero h1 {
    font-size: clamp(1.85rem, 9.2vw, 2.6rem);
  }

  .paper-facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .control-grid,
  .figure-grid,
  .citation-layout {
    grid-template-columns: 1fr;
  }

  .roofline-numbers {
    grid-template-columns: 1fr;
  }

  .roofline-numbers div {
    grid-template-columns: 86px 1fr;
  }

  .roofline-visual img {
    min-height: 0;
    padding: 12px;
  }

  .figure-tools {
    align-items: flex-start;
    flex-direction: column;
  }

  .figure-image-link {
    min-height: 220px;
    padding: 12px;
  }

  .article-footer {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .article-section {
    padding: 42px 0;
  }

  .resource-links .button,
  .citation-actions .button {
    width: 100%;
  }

  .paper-nav a {
    padding-inline: 11px;
  }

  .preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .preset-buttons button {
    width: 100%;
  }

  .scenario-result,
  .simulator-shell {
    padding: 16px;
  }
}

@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;
  }
}

@media print {
  .paper-nav,
  .resource-links,
  #scenario-form,
  .figure-tools,
  .figure-expand,
  #figure-dialog,
  #copy-scenario,
  #copy-citation,
  .article-footer {
    display: none !important;
  }

  body,
  .paper-hero,
  .article-section,
  .simulator-section,
  .figures-section {
    color: #000;
    background: #fff;
  }

  .roofline-section {
    color: #000;
    background: #fff;
  }

  .roofline-layout {
    grid-template-columns: 1fr 1fr;
  }

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

  .roofline-visual,
  .roofline-numbers div {
    break-inside: avoid;
  }

  .paper-wrap {
    width: 100%;
  }

  .simulator-shell,
  .scenario-result,
  .gate-story,
  .strategy-card {
    color: #000;
    background: #fff;
    border-color: #aaa;
  }

  .figure-grid {
    display: block;
  }

  .figure-card {
    margin-bottom: 1rem;
    break-inside: avoid;
  }
}