:root {
  --ink: #17212b;
  --muted: #68737f;
  --paper: #f7f3ea;
  --paper-deep: #eee7d8;
  --white: #fffdf8;
  --night: #101b2a;
  --blue: #1f4f78;
  --blue-light: #dbe8f1;
  --rust: #a4472e;
  --rule: #d6cebe;
  --shadow: 0 22px 70px rgba(23, 33, 43, 0.11);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 0%, rgba(31, 79, 120, 0.09), transparent 31rem),
    linear-gradient(180deg, var(--paper) 0%, #f3efe6 100%);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.65;
}

a { color: var(--blue); text-underline-offset: 0.18em; }
a:hover { color: var(--rust); }
a:focus-visible {
  outline: 3px solid #e8ad92;
  outline-offset: 4px;
  border-radius: 3px;
}

.site-header {
  border-bottom: 1px solid rgba(255,255,255,0.16);
  color: #fff;
  background:
    linear-gradient(125deg, rgba(164, 71, 46, 0.22), transparent 44%),
    var(--night);
}

.nav {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: #fff;
  text-decoration: none;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 750;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.nav-links { display: flex; gap: 22px; }
.nav-links a {
  color: #dbe4ed;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.85rem;
  text-decoration: none;
}

.hero {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 104px;
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 70px;
  align-items: end;
}

.eyebrow, .kicker, .paper-status {
  margin: 0 0 16px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.73rem;
  font-weight: 760;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.eyebrow { color: #e8ad92; }
.hero h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(3.2rem, 8vw, 6.9rem);
  line-height: 0.93;
  font-weight: 500;
  letter-spacing: -0.055em;
}

.hero-deck {
  margin: 28px 0 0;
  max-width: 700px;
  color: #cbd7e1;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.hero-meta {
  padding-left: 24px;
  border-left: 1px solid rgba(255,255,255,0.25);
  color: #cbd7e1;
  font-size: 0.94rem;
}

.hero-meta strong {
  display: block;
  margin-bottom: 5px;
  color: #fff;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 74px 0;
}

.notice {
  margin-top: -42px;
  position: relative;
  padding: 30px 34px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  border: 1px solid #d8b8a6;
  border-radius: 5px;
  background: #fff8f1;
  box-shadow: var(--shadow);
}

.notice-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--rust);
  font: 800 1.2rem/1 Inter, ui-sans-serif, system-ui, sans-serif;
}

.notice h2 { margin: 0 0 7px; font-size: 1.28rem; }
.notice p { margin: 0; }
.notice + .notice { margin-top: 24px; }

.section-head {
  margin-bottom: 30px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  border-bottom: 1px solid var(--rule);
}

.section-head h2 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.05;
  font-weight: 500;
  letter-spacing: -0.025em;
}

.section-head p {
  max-width: 490px;
  margin: 0 0 18px;
  color: var(--muted);
}

.papers { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.papers.single { grid-template-columns: 1fr; }
.papers.single .paper-card { min-height: auto; }

.paper-card {
  min-height: 420px;
  padding: 34px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--rule);
  border-top: 5px solid var(--blue);
  border-radius: 4px;
  background: rgba(255, 253, 248, 0.86);
  box-shadow: 0 12px 36px rgba(23, 33, 43, 0.06);
}

.paper-card:nth-child(2) { border-top-color: var(--rust); }
.kicker { color: var(--blue); }
.paper-card:nth-child(2) .kicker { color: var(--rust); }
.paper-card h3 { margin: 0; font-size: 1.85rem; line-height: 1.18; font-weight: 500; }
.paper-card .summary { color: #4e5964; }
.paper-card .meta { margin-top: auto; color: var(--muted); font-size: 0.86rem; }

.button-row { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; }
.button {
  padding: 10px 15px;
  border: 1px solid var(--blue);
  border-radius: 3px;
  color: #fff;
  background: var(--blue);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}
.button.secondary { color: var(--blue); background: transparent; }
.button:hover { color: #fff; background: var(--rust); border-color: var(--rust); }

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.method-grid h3 { margin-bottom: 5px; font-size: 1.1rem; }
.method-grid p { margin-top: 0; color: var(--muted); }
.number {
  color: var(--rust);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
}

.site-footer {
  padding: 38px 20px;
  color: #aebdca;
  background: var(--night);
  text-align: center;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.83rem;
}
.site-footer a { color: #fff; }

.paper-hero { padding: 68px 0 74px; }
.paper-hero .inner { width: min(920px, calc(100% - 40px)); margin: 0 auto; }
.paper-status { color: #e8ad92; }
.paper-hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(2.55rem, 6vw, 5rem);
  line-height: 1.02;
  font-weight: 500;
  letter-spacing: -0.04em;
}
.byline { margin: 24px 0 0; color: #d2dde6; font-size: 1.05rem; }
.release { margin: 8px 0 0; color: #aebdca; font-family: Inter, ui-sans-serif, system-ui, sans-serif; font-size: 0.82rem; }

.paper-main { width: min(920px, calc(100% - 40px)); margin: 0 auto; padding: 58px 0 80px; }
.paper-main h2 { margin-top: 2.2em; font-size: 2rem; font-weight: 500; }
.paper-main h3 { margin-top: 1.8em; }
.lede { font-size: 1.25rem; line-height: 1.7; }
.fact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 32px 0; }
.fact {
  padding: 20px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: rgba(255,255,255,0.6);
}
.fact strong { display: block; color: var(--rust); font: 800 0.75rem/1.4 Inter, ui-sans-serif, system-ui, sans-serif; text-transform: uppercase; letter-spacing: 0.08em; }
.fact span { display: block; margin-top: 7px; }

.certificate-list { padding: 0; list-style: none; border-top: 1px solid var(--rule); }
.certificate-list li { padding: 14px 0; border-bottom: 1px solid var(--rule); }
.certificate-list code { font-size: 0.83em; }

.pdf-frame {
  width: 100%;
  height: min(82vh, 1040px);
  border: 1px solid #b9c0c6;
  border-radius: 4px;
  background: #e7e9eb;
  box-shadow: var(--shadow);
}

.fine-print { color: var(--muted); font-size: 0.88rem; }

.paper-actions { margin: 34px 0 54px; }

.paper-text {
  font-size: 1.02rem;
  line-height: 1.72;
}

.paper-text section {
  scroll-margin-top: 24px;
  padding-top: 8px;
}

.paper-text h2,
.pdf-section h2 {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.paper-text p { margin: 0.85em 0; }

.paper-toc {
  margin: 48px 0 26px;
  padding: 24px 28px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: rgba(255, 253, 248, 0.72);
}

.paper-toc h2 { margin-top: 0; }
.paper-toc ol { columns: 2; margin-bottom: 0; }
.paper-toc li { margin: 5px 26px 5px 0; break-inside: avoid; }

.equation {
  margin: 1.3rem 0;
  overflow-x: auto;
  overflow-y: hidden;
  color: #111827;
  text-align: center;
}

.theorem-block {
  margin: 1.6rem 0;
  padding: 18px 22px;
  border-left: 4px solid var(--blue);
  background: rgba(219, 232, 241, 0.43);
}

.theorem-block p:first-child { margin-top: 0; }
.theorem-block p:last-child { margin-bottom: 0; }

.table-wrap { margin: 24px 0; overflow-x: auto; }
.paper-table { width: 100%; border-collapse: collapse; font-size: 0.91rem; }
.paper-table th,
.paper-table td { padding: 10px 12px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.paper-table th { color: #fff; background: var(--blue); font-family: Inter, ui-sans-serif, system-ui, sans-serif; font-size: 0.78rem; }
.paper-table tbody tr:nth-child(even) { background: rgba(255,255,255,0.44); }
.paper-table caption {
  padding: 0 0 10px;
  color: var(--muted);
  text-align: left;
  font-style: italic;
}

.hash { overflow-wrap: anywhere; word-break: break-all; }
.nowrap { white-space: nowrap; }
.references { padding-left: 1.4rem; }
.references li { margin: 0 0 0.95rem; padding-left: 0.35rem; }
.pdf-section { margin-top: 74px; }

.research-cover {
  margin: 40px 0 56px;
}

.research-cover img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 5px;
  box-shadow: var(--shadow);
}

@media (max-width: 780px) {
  .nav-links { display: none; }
  .hero { grid-template-columns: 1fr; padding: 68px 0 78px; gap: 38px; }
  .hero-meta { padding-left: 0; padding-top: 20px; border-left: 0; border-top: 1px solid rgba(255,255,255,0.25); }
  .notice { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .papers, .method-grid, .fact-grid { grid-template-columns: 1fr; }
  .paper-toc ol { columns: 1; }
  .paper-text { font-size: 0.98rem; }
  .equation-wide { font-size: 0.86rem; }
  .paper-card { min-height: auto; }
}