:root {
  color-scheme: light;
  --paper: #fbfaf6;
  --panel: #ffffff;
  --ink: #17201c;
  --muted: #5f6c65;
  --line: #dfe5df;
  --pine: #165f46;
  --pine-soft: #eaf5ef;
  --gold: #9a6417;
  --gold-soft: #fff7e8;
  --blue: #245d8f;
  --blue-soft: #edf5fb;
  --rose: #9b4050;
  --rose-soft: #fff1f3;
  --shadow: 0 22px 60px rgba(38, 52, 45, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 7% 4%, rgba(22, 95, 70, 0.08), transparent 25rem),
    var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

a {
  color: var(--pine);
  text-underline-offset: 0.18em;
  overflow-wrap: anywhere;
}

a:hover {
  color: #0c4733;
}

a:focus-visible {
  outline: 3px solid rgba(22, 95, 70, 0.2);
  outline-offset: 3px;
  border-radius: 4px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(223, 229, 223, 0.9);
  background: rgba(251, 250, 246, 0.9);
  backdrop-filter: blur(18px);
}

.topbar-inner {
  width: min(1120px, calc(100% - 36px));
  min-height: 58px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid #b8d8c7;
  border-radius: 50%;
  background: var(--pine-soft);
  color: var(--pine);
  font-family: Georgia, serif;
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.nav a {
  padding: 7px 10px;
  border-radius: 999px;
  color: #425047;
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
}

.nav a:hover {
  background: var(--pine-soft);
  color: var(--pine);
}

.nav a[aria-current="page"] {
  background: var(--pine-soft);
  color: var(--pine);
}

.hero {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(70px, 10vw, 118px) 0 54px;
}

.kicker,
.eyebrow {
  margin: 0 0 12px;
  color: var(--pine);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  letter-spacing: -0.025em;
}

h1 {
  max-width: 900px;
  margin: 0;
  font-family: Georgia, "Songti SC", "Noto Serif CJK SC", serif;
  font-size: clamp(42px, 7vw, 78px);
  font-weight: 650;
  line-height: 1.05;
}

.deck {
  max-width: 780px;
  margin: 26px 0 0;
  color: #35423b;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.62;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 26px;
}

.meta span {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  color: var(--muted);
  font-size: 12px;
  font-weight: 720;
}

.verdict {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto 34px;
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid #b8d8c7;
  border-radius: 22px;
  background: linear-gradient(145deg, #f4fbf7, #ffffff);
  box-shadow: var(--shadow);
}

.verdict strong {
  color: var(--pine);
}

.verdict p {
  max-width: 880px;
  margin: 0;
  font-family: Georgia, "Songti SC", "Noto Serif CJK SC", serif;
  font-size: clamp(22px, 3vw, 31px);
  line-height: 1.5;
}

.layout {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 56px;
  align-items: start;
}

.article {
  min-width: 0;
  padding-bottom: 76px;
}

.article section {
  padding: 38px 0;
  border-top: 1px solid var(--line);
}

.article h2 {
  margin: 0 0 18px;
  font-family: Georgia, "Songti SC", "Noto Serif CJK SC", serif;
  font-size: clamp(29px, 4vw, 42px);
  font-weight: 650;
  line-height: 1.2;
}

.article h3 {
  margin: 26px 0 10px;
  font-size: 20px;
  line-height: 1.4;
}

.article p,
.article li {
  font-size: 17px;
}

.article p {
  margin: 0 0 18px;
}

.article ul,
.article ol {
  margin: 12px 0 20px;
  padding-left: 24px;
}

.article li {
  margin: 8px 0;
}

.sidebar {
  position: sticky;
  top: 82px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.78);
}

.sidebar strong {
  display: block;
  margin-bottom: 9px;
  font-size: 12px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.sidebar a {
  display: block;
  padding: 6px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
}

.sidebar a:hover {
  color: var(--pine);
}

.formula {
  margin: 22px 0;
  padding: 20px;
  border: 1px solid #c9d9cf;
  border-radius: 15px;
  background: #f8fbf9;
  overflow-x: auto;
}

.formula-label {
  display: block;
  margin-bottom: 8px;
  color: var(--pine);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.pipeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0;
}

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

.grounding-spine .pipe-step:nth-child(1) {
  background: var(--pine-soft);
}

.grounding-spine .pipe-step:nth-child(2) {
  background: var(--blue-soft);
}

.grounding-spine .pipe-step:nth-child(3) {
  background: var(--gold-soft);
}

.grounding-spine .pipe-step strong {
  font-size: 17px;
}

.event-record p:first-of-type {
  font-family: Georgia, "Songti SC", "Noto Serif CJK SC", serif;
  font-size: 20px;
}

.pipe-step {
  position: relative;
  min-width: 0;
  min-height: 148px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: 0 12px 30px rgba(38, 52, 45, 0.05);
}

.pipe-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -21px;
  z-index: 2;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  color: var(--pine);
  transform: translateY(-50%);
}

.pipe-step span {
  color: var(--pine);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pipe-step strong {
  display: block;
  margin: 8px 0;
  font-size: 18px;
}

.pipe-step small {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.callout {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--gold);
  border-radius: 0 14px 14px 0;
  background: var(--gold-soft);
}

.callout.blue {
  border-left-color: var(--blue);
  background: var(--blue-soft);
}

.callout.rose {
  border-left-color: var(--rose);
  background: var(--rose-soft);
}

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

.table-wrap {
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

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

th,
td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
  font-size: 14px;
  line-height: 1.55;
}

th {
  background: #f3f6f3;
  color: #344139;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

.role-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.role-card {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
}

.role-card .formula {
  max-width: 100%;
  margin: 14px 0;
  padding: 14px;
  box-sizing: border-box;
}

.role-card strong {
  display: block;
  margin-bottom: 7px;
}

.role-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.58;
}

.references {
  padding-left: 0 !important;
  list-style: none;
}

.references li {
  margin: 0;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.references li:last-child {
  border-bottom: 0;
}

.closing {
  padding: 30px !important;
  border: 1px solid #b8d8c7 !important;
  border-radius: 20px;
  background: var(--pine-soft);
}

.closing p {
  margin: 0;
  font-family: Georgia, "Songti SC", "Noto Serif CJK SC", serif;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.52;
}

code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
}

mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
}

.footer-inner {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: 32px 0 46px;
  display: flex;
  justify-content: space-between;
  gap: 28px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 900px) {
  .topbar-inner {
    padding: 12px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .sidebar {
    display: none;
  }

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

  .pipeline.two-step {
    grid-template-columns: 1fr;
  }

  .pipe-step:not(:last-child)::after {
    content: "↓";
    top: auto;
    right: 50%;
    bottom: -21px;
    transform: translateX(50%);
  }
}

@media (max-width: 620px) {
  .nav {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .hero {
    padding-top: 58px;
  }

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

  table {
    min-width: 0;
  }

  thead {
    display: none;
  }

  tbody,
  tr,
  td {
    display: block;
  }

  tr {
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
  }

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

  td {
    padding: 6px 14px;
    border: 0;
    font-size: 13px;
  }

  td:first-child {
    color: var(--pine);
    font-size: 14px;
    font-weight: 760;
  }

  .roles-table td:nth-child(2)::before,
  .roles-table td:nth-child(3)::before,
  .models-table td:nth-child(2)::before,
  .models-table td:nth-child(3)::before {
    display: block;
    margin-bottom: 2px;
    color: #7a867f;
    font-size: 10px;
    font-weight: 820;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .roles-table td:nth-child(2)::before {
    content: "判断";
  }

  .roles-table td:nth-child(3)::before {
    content: "重复观测时";
  }

  .models-table td:nth-child(2)::before {
    content: "得到的 model shape";
  }

  .models-table td:nth-child(3)::before {
    content: "Existing research";
  }

  .article p,
  .article li {
    font-size: 16px;
  }

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