@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;900&family=Noto+Serif+SC:wght@600;700;900&display=swap");

:root {
  --ink: #12171c;
  --ink-soft: #2f3942;
  --paper: #f3f1eb;
  --paper-deep: #e9e5dc;
  --line: #cbc7bc;
  --muted: #68727a;
  --signal: #d84a36;
  --signal-dark: #a83224;
  --amber: #b67817;
  --steel: #8fa1ac;
  --white: #fbfaf6;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: rgba(216, 74, 54, 0.65);
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--signal-dark);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 8px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: min(calc(100% - 48px), var(--max));
  min-height: 72px;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}

.site-header a {
  text-decoration: none;
}

.brand {
  font-weight: 900;
  letter-spacing: -0.02em;
}

.site-header nav {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

main {
  overflow: clip;
}

.hero,
.quick-read,
.matrix-section,
.physics-section,
.model-requirements,
.sources {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.hero {
  padding: 78px 0 86px;
}

.hero-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--ink);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.hero-topline p {
  margin: 0;
}

.hero-topline span {
  padding: 3px 10px;
  color: var(--signal-dark);
  border: 1px solid currentColor;
}

.kicker {
  margin: 58px 0 18px;
  color: var(--signal-dark);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2 {
  font-family: "Noto Serif SC", "Songti SC", serif;
}

h1 {
  max-width: 1040px;
  margin: 0;
  font-size: clamp(2.7rem, 6.6vw, 6rem);
  line-height: 1.12;
  letter-spacing: -0.055em;
}

h1 em {
  color: var(--signal);
  font-style: normal;
}

.deck {
  max-width: 830px;
  margin: 38px 0 0 auto;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 1.7vw, 1.35rem);
  line-height: 1.85;
}

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

.verdict {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 28px;
  align-items: center;
  max-width: 920px;
  margin: 68px 0 0 auto;
  padding: 28px 32px;
  color: var(--white);
  background: var(--ink);
  box-shadow: 14px 14px 0 rgba(216, 74, 54, 0.22);
}

.verdict-mark {
  display: grid;
  place-items: center;
  width: 104px;
  height: 104px;
  color: var(--signal);
  border: 2px solid var(--signal);
  border-radius: 50%;
  font-family: Georgia, serif;
  font-size: 4rem;
  font-weight: 700;
  line-height: 1;
}

.verdict p,
.verdict span {
  margin: 0;
}

.verdict p {
  color: var(--steel);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.verdict strong {
  display: block;
  margin: 2px 0 5px;
  color: #fff;
  font-size: clamp(1.45rem, 3vw, 2.35rem);
  line-height: 1.3;
}

.verdict span {
  display: block;
  color: #bfc8ce;
  font-size: 0.9rem;
  line-height: 1.65;
}

.quick-read,
.matrix-section,
.physics-section,
.model-requirements,
.sources {
  padding: 92px 0;
}

.section-head {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 22px;
  align-items: start;
  margin-bottom: 50px;
}

.section-head > span {
  padding-top: 7px;
  color: var(--signal);
  border-top: 3px solid currentColor;
  font-family: Georgia, serif;
  font-size: 1.1rem;
  font-weight: 700;
}

.section-head p,
.section-head h2 {
  margin: 0;
}

.section-head p {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-head h2 {
  max-width: 900px;
  font-size: clamp(2rem, 4vw, 3.55rem);
  line-height: 1.28;
  letter-spacing: -0.04em;
}

.quick-read {
  border-top: 1px solid var(--line);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.quick-grid article {
  grid-column: span 4;
  min-height: 240px;
  padding: 30px;
  background: var(--white);
}

.quick-grid article:nth-child(4),
.quick-grid article:nth-child(5) {
  grid-column: span 6;
}

.status {
  display: inline-block;
  margin-bottom: 25px;
  padding: 3px 9px;
  border: 1px solid currentColor;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.status.unsupported {
  color: var(--signal-dark);
}

.status.uncertain {
  color: var(--amber);
}

.quick-grid h3 {
  margin: 0 0 10px;
  font-size: 1.22rem;
  line-height: 1.45;
}

.quick-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.75;
}

.dark-section {
  position: relative;
  padding: 100px max(24px, calc((100vw - var(--max)) / 2));
  color: #e8eaeb;
  background: var(--ink);
}

.dark-section::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.22;
  background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
}

.dark-section > * {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max));
  margin-inline: auto;
}

.section-head.inverse p {
  color: var(--steel);
}

.section-head.inverse h2 {
  color: #fff;
}

.chain {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 18px;
  align-items: center;
  margin-top: 64px;
}

.chain div {
  min-height: 150px;
  padding: 28px;
  border: 1px solid #48525a;
  background: rgba(255, 255, 255, 0.025);
}

.chain div.broken {
  border-color: var(--signal);
  border-style: dashed;
}

.chain b,
.chain span {
  display: block;
}

.chain b {
  margin-bottom: 10px;
  color: #fff;
  font-size: 1.06rem;
}

.chain span {
  color: #aeb8be;
  font-size: 0.86rem;
  line-height: 1.6;
}

.chain i {
  color: var(--signal);
  font-size: 1.6rem;
  font-style: normal;
}

.source-findings {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 52px;
  margin-top: 52px;
  padding-top: 44px;
  border-top: 1px solid #3d464d;
}

.source-findings p {
  margin: 0;
  color: #c4cbd0;
}

.source-findings strong {
  color: #fff;
}

.source-findings a {
  color: #fff;
}

.table-wrap {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
}

table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

th,
td {
  padding: 24px 22px;
  text-align: left;
  vertical-align: top;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

th:last-child,
td:last-child {
  border-right: 0;
}

tbody tr:last-child td {
  border-bottom: 0;
}

th {
  color: var(--white);
  background: var(--ink);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

th:nth-child(1) { width: 27%; }
th:nth-child(2) { width: 27%; }
th:nth-child(3) { width: 29%; }
th:nth-child(4) { width: 17%; }

td {
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.72;
}

td strong {
  color: var(--ink);
}

.cell-grade {
  display: inline-block;
  padding: 4px 9px;
  font-size: 0.7rem;
  font-weight: 800;
  line-height: 1.45;
}

.cell-grade.g2 {
  color: #7a4d07;
  background: #f1dfba;
}

.cell-grade.g3 {
  color: #8b2e22;
  background: #f2d1cc;
}

.physics-section {
  border-top: 1px solid var(--line);
}

.reservoir-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.reservoir-facts div {
  min-height: 160px;
  padding: 26px;
  background: var(--white);
}

.reservoir-facts span,
.reservoir-facts strong {
  display: block;
}

.reservoir-facts span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.reservoir-facts strong {
  margin-top: 28px;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 1.1;
}

.caption {
  max-width: 920px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.75;
}

.sanity-check {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 52px;
  margin-top: 65px;
  padding: 46px;
  color: var(--white);
  background: var(--signal-dark);
}

.mini-label {
  margin: 0 0 14px;
  color: #f2b7ac;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.sanity-copy h3 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.42;
}

.sanity-copy > p:last-child {
  margin-bottom: 0;
  color: #f2d7d2;
  font-size: 0.86rem;
}

.equations {
  display: grid;
  gap: 1px;
  background: rgba(255, 255, 255, 0.3);
}

.equations div {
  padding: 24px 26px;
  background: rgba(57, 8, 2, 0.3);
}

.equations span,
.equations strong,
.equations small {
  display: block;
}

.equations span,
.equations small {
  color: #f0c8c1;
}

.equations span {
  font-size: 0.76rem;
}

.equations strong {
  margin: 4px 0;
  font-family: Georgia, serif;
  font-size: clamp(1.35rem, 3vw, 2.1rem);
}

.equations small {
  font-size: 0.68rem;
}

.caution {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  margin-top: 30px;
  padding: 26px 30px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--signal);
  background: var(--white);
}

.caution b {
  color: var(--signal-dark);
}

.caution p {
  margin: 0;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: #3c464d;
  border: 1px solid #3c464d;
}

.detail-grid article {
  position: relative;
  padding: 38px;
  background: #171d22;
}

.detail-index {
  position: absolute;
  top: 24px;
  right: 28px;
  color: #414c54;
  font-family: Georgia, serif;
  font-size: 3.4rem;
  line-height: 1;
}

.detail-grid h3 {
  position: relative;
  z-index: 1;
  max-width: 82%;
  margin: 0 0 22px;
  color: #fff;
  font-size: 1.25rem;
  line-height: 1.55;
}

.detail-grid p {
  margin: 0 0 16px;
  color: #bfc7cc;
  font-size: 0.9rem;
}

.detail-grid p:last-child {
  margin-bottom: 0;
}

.detail-grid strong {
  color: #fff;
}

.requirements-lede {
  max-width: 900px;
  margin: 0 0 44px 94px;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.requirements-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--ink);
}

.requirements-list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.requirements-list li > b {
  color: var(--signal);
  font-family: Georgia, serif;
}

.requirements-list span {
  color: var(--ink-soft);
}

.requirements-list span strong {
  display: inline-block;
  min-width: 116px;
  color: var(--ink);
}

.burden-box {
  max-width: 960px;
  margin: 58px 0 0 auto;
  padding: 36px 40px;
  color: var(--white);
  background: var(--ink);
  border-top: 5px solid var(--signal);
}

.burden-box h3 {
  margin: 0 0 10px;
  font-size: 1.35rem;
}

.burden-box p {
  margin: 0;
  color: #c4cbd0;
}

.final-conclusion {
  padding: 100px max(24px, calc((100vw - var(--max)) / 2));
  color: var(--white);
  background: var(--signal-dark);
}

.final-conclusion > p:first-child {
  margin: 0 0 18px;
  color: #f1b7ae;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.final-conclusion h2 {
  max-width: var(--max);
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 1.3;
  letter-spacing: -0.04em;
}

.final-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 54px;
  max-width: var(--max);
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.final-grid p {
  margin: 0;
  color: #f2d9d4;
}

.final-grid b {
  color: #fff;
}

.scope-note {
  max-width: var(--max);
  margin: 48px 0 0;
  padding: 20px 24px;
  color: #f3c5bd;
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.82rem;
}

.source-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--ink);
}

.source-list li {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.source-list li > span {
  color: var(--signal);
  font-family: Georgia, serif;
  font-weight: 700;
}

.source-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.source-list a {
  color: var(--ink);
  font-weight: 700;
}

.method-note {
  margin-top: 48px;
  padding: 30px 34px;
  border: 1px solid var(--line);
  background: var(--white);
}

.method-note p {
  margin: 0 0 14px;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.method-note p:last-child {
  margin-bottom: 0;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  width: min(calc(100% - 48px), var(--max));
  margin: 0 auto;
  padding: 38px 0 48px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

footer a {
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
}

footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .quick-grid article {
    grid-column: span 6;
  }

  .quick-grid article:last-child {
    grid-column: 1 / -1;
  }

  .reservoir-facts {
    grid-template-columns: 1fr 1fr;
  }

  .sanity-check,
  .source-findings {
    grid-template-columns: 1fr;
  }

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

  .chain i {
    transform: rotate(90deg);
    justify-self: center;
  }

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

@media (max-width: 700px) {
  body {
    font-size: 16px;
  }

  .site-header,
  .hero,
  .quick-read,
  .matrix-section,
  .physics-section,
  .model-requirements,
  .sources,
  footer {
    width: min(calc(100% - 32px), var(--max));
  }

  .site-header {
    min-height: 62px;
  }

  .site-header nav span:last-child {
    display: none;
  }

  .hero {
    padding: 50px 0 64px;
  }

  .hero-topline {
    gap: 12px;
    align-items: flex-start;
    font-size: 0.64rem;
  }

  .hero-topline span {
    text-align: right;
  }

  .kicker {
    margin-top: 42px;
  }

  h1 {
    font-size: clamp(2.4rem, 12vw, 4.1rem);
    line-height: 1.18;
  }

  .deck {
    margin-top: 30px;
    font-size: 1.02rem;
  }

  .verdict {
    grid-template-columns: 68px 1fr;
    gap: 18px;
    margin-top: 46px;
    padding: 22px 20px;
    box-shadow: 8px 8px 0 rgba(216, 74, 54, 0.22);
  }

  .verdict-mark {
    width: 62px;
    height: 62px;
    font-size: 2.6rem;
  }

  .verdict strong {
    font-size: 1.2rem;
  }

  .verdict span {
    grid-column: 1 / -1;
    font-size: 0.79rem;
  }

  .quick-read,
  .matrix-section,
  .physics-section,
  .model-requirements,
  .sources {
    padding: 68px 0;
  }

  .dark-section,
  .final-conclusion {
    padding: 72px 16px;
  }

  .section-head {
    grid-template-columns: 48px 1fr;
    gap: 14px;
    margin-bottom: 36px;
  }

  .section-head h2 {
    font-size: 1.82rem;
  }

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

  .quick-grid article,
  .quick-grid article:nth-child(4),
  .quick-grid article:nth-child(5),
  .quick-grid article:last-child {
    grid-column: auto;
    min-height: auto;
    padding: 24px;
  }

  .status {
    margin-bottom: 17px;
  }

  .chain div {
    min-height: auto;
    padding: 24px;
  }

  .source-findings {
    gap: 26px;
  }

  .table-wrap {
    border: 0;
    background: transparent;
  }

  table,
  tbody,
  tr,
  td {
    display: block;
    width: 100%;
  }

  thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  tbody tr {
    margin-bottom: 18px;
    border: 1px solid var(--line);
    background: var(--white);
  }

  td {
    display: grid;
    grid-template-columns: 105px 1fr;
    gap: 12px;
    padding: 16px 18px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  tbody tr:last-child td {
    border-bottom: 1px solid var(--line);
  }

  tbody tr td:last-child {
    border-bottom: 0;
  }

  td::before {
    content: attr(data-label);
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 800;
    line-height: 1.5;
  }

  .reservoir-facts div {
    min-height: 130px;
    padding: 20px;
  }

  .reservoir-facts strong {
    margin-top: 20px;
    font-size: 1.45rem;
  }

  .sanity-check {
    gap: 28px;
    margin-top: 44px;
    padding: 28px 22px;
  }

  .caution {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 22px;
  }

  .detail-grid article {
    padding: 30px 24px;
  }

  .detail-grid h3 {
    max-width: 86%;
    font-size: 1.15rem;
  }

  .requirements-lede {
    margin-left: 0;
  }

  .requirements-list li {
    grid-template-columns: 44px 1fr;
    gap: 12px;
  }

  .requirements-list span strong {
    display: block;
    min-width: 0;
    margin-bottom: 3px;
  }

  .burden-box {
    padding: 28px 24px;
  }

  .final-conclusion h2 {
    font-size: 2.15rem;
  }

  .final-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .source-list li {
    grid-template-columns: 40px 1fr;
    gap: 10px;
  }

  .method-note {
    padding: 24px 20px;
  }

  footer {
    display: block;
  }

  footer p {
    margin-top: 7px;
  }
}

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

@media print {
  body {
    color: #000;
    background: #fff;
  }

  .site-header,
  footer {
    display: none;
  }

  .dark-section,
  .final-conclusion,
  .verdict,
  .sanity-check {
    color: #000;
    background: #fff;
    border: 1px solid #777;
  }

  a {
    color: #000;
  }
}