:root {
  color-scheme: light;
  --ink: #050505;
  --muted: #55585c;
  --line: #d8d8d8;
  --paper: #ffffff;
  --soft: #f5f5f3;
  --accent: #176bff;
  --accent-2: #00a889;
  --accent-3: #f0b400;
  --danger: #d94747;
  --max: 1140px;
  --radius: 8px;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

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

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

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  transform: translateY(-140%);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 8px 12px;
}

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

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

.announcement {
  min-height: 46px;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  place-items: center;
  padding: 0 16px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.announcement a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 80px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 0 30px;
  border-bottom: 1px solid transparent;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 190px;
  font-weight: 800;
  font-size: 23px;
  line-height: 1;
}

.brand-mark {
  width: 24px;
  height: 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 4px;
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.brand-mark span {
  display: block;
  background: var(--ink);
}

.brand-name {
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 23px;
  font-size: 15px;
}

.site-nav a {
  white-space: nowrap;
  padding: 10px 0;
  color: #171717;
}

.site-nav a:hover,
.site-nav .active {
  text-decoration: underline;
  text-underline-offset: 6px;
}

.site-nav .nav-cta {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 13px 22px;
  text-decoration: none;
  font-weight: 700;
}

.site-nav .nav-cta:hover {
  background: #2b2b2b;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span:not(.sr-only) {
  width: 18px;
  height: 2px;
  background: var(--ink);
}

.page-hero,
.filters,
.papers-section,
.cta-band,
.site-footer {
  padding-left: 30px;
  padding-right: 30px;
}

.page-hero {
  max-width: calc(var(--max) + 60px);
  margin: 0 auto;
  padding-top: 66px;
  padding-bottom: 58px;
}

.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--ink);
  text-transform: uppercase;
  font-size: 12px;
}

.section-eyebrow i {
  display: block;
  height: 1px;
  background: var(--line);
  flex: 1 1 auto;
}

.hero-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-top: 14px;
  padding-bottom: 58px;
  border-bottom: 1px solid var(--ink);
}

h1 {
  margin: 0;
  font-size: 54px;
  font-weight: 500;
  line-height: 1.05;
}

.dot-matrix {
  width: 43px;
  height: 43px;
  display: grid;
  grid-template-columns: repeat(3, 5px);
  grid-auto-rows: 5px;
  justify-content: space-between;
  align-content: space-between;
  flex: 0 0 auto;
}

.dot-matrix span {
  width: 4px;
  height: 4px;
  background: var(--ink);
  border-radius: 50%;
}

.filters {
  max-width: calc(var(--max) + 60px);
  margin: 0 auto;
  padding-bottom: 31px;
  border-bottom: 1px solid var(--ink);
}

.search-form {
  width: min(366px, 100%);
}

.search-form label {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  text-transform: uppercase;
}

.search-field {
  position: relative;
}

.search-field input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--ink);
  border-radius: 5px;
  background: var(--paper);
  padding: 0 44px 0 13px;
  outline: none;
}

.search-field input:focus {
  box-shadow: 0 0 0 3px rgba(23, 107, 255, 0.18);
}

.clear-search {
  position: absolute;
  top: 50%;
  right: 8px;
  width: 30px;
  height: 30px;
  transform: translateY(-50%);
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}

.clear-search:hover {
  color: var(--ink);
  background: #eeeeee;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.filter-row::-webkit-scrollbar {
  display: none;
}

.filter-chip {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  padding: 0 15px;
  cursor: pointer;
}

.filter-chip:hover,
.filter-chip.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.papers-section {
  max-width: calc(var(--max) + 60px);
  margin: 0 auto;
  padding-top: 50px;
  padding-bottom: 86px;
}

.papers-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 24px;
}

.papers-heading h2 {
  margin: 0;
  font-size: 25px;
  line-height: 1.2;
  font-weight: 650;
}

.papers-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.papers-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 44px 20px;
}

.paper-card {
  min-width: 0;
}

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

.paper-image {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 1.62;
  background: #050505;
  color: var(--paper);
  border-radius: 0;
  isolation: isolate;
}

.paper-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.01);
  transition: transform 240ms ease, filter 240ms ease;
}

.paper-image::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0.62)),
    linear-gradient(90deg, rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.08));
}

.paper-image:hover img {
  transform: scale(1.05);
  filter: contrast(1.08);
}

.image-brand,
.paper-type,
.paper-image strong {
  position: absolute;
  left: 16px;
  right: 16px;
  z-index: 2;
}

.image-brand {
  top: 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  right: auto;
  font-weight: 800;
  font-size: 15px;
}

.image-brand b {
  width: 14px;
  height: 14px;
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 2px;
  transform: rotate(45deg);
}

.image-brand b::before,
.image-brand b::after {
  content: "";
  background: #fff;
  box-shadow: 6px 0 0 #fff, 0 6px 0 #fff;
}

.paper-type {
  bottom: 86px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 10px;
  text-transform: uppercase;
}

.paper-image strong {
  bottom: 23px;
  max-width: 92%;
  font-size: 22px;
  font-weight: 560;
  line-height: 1.25;
}

.paper-card p {
  min-height: 80px;
  margin: 16px 0 15px;
  color: #42464a;
  font-size: 16px;
  line-height: 1.52;
}

.paper-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  color: #171717;
  font-size: 13px;
}

.paper-meta span {
  color: var(--muted);
}

.paper-meta a {
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.empty-state {
  margin: 32px 0 0;
  min-height: 120px;
  display: grid;
  place-items: center;
  color: var(--muted);
  background: var(--soft);
  border-radius: var(--radius);
}

.cta-band {
  max-width: calc(var(--max) + 60px);
  margin: 0 auto 70px;
  min-height: 230px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.cta-band h2 {
  margin: 0 0 12px;
  font-size: 38px;
  line-height: 1.15;
  font-weight: 520;
}

.cta-band p {
  margin: 0;
  max-width: 560px;
  color: var(--muted);
  font-size: 18px;
}

.cta-band a {
  flex: 0 0 auto;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 15px 26px;
  font-weight: 700;
}

.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding-top: 58px;
}

.footer-statement,
.footer-links,
.footer-bottom {
  max-width: var(--max);
  margin: 0 auto;
}

.footer-statement {
  text-transform: uppercase;
  font-size: 46px;
  line-height: 1.08;
  font-weight: 650;
  margin-bottom: 58px;
}

.footer-statement span {
  display: block;
}

.footer-links {
  display: grid;
  grid-template-columns: 1.15fr 1.25fr 0.8fr 0.7fr;
  gap: 48px;
  padding-bottom: 64px;
}

.footer-links h2 {
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.footer-links a {
  display: block;
  margin: 0 0 12px;
  color: rgba(255, 255, 255, 0.9);
}

.footer-links a:hover {
  color: var(--paper);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: center;
  min-height: 140px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  color: rgba(255, 255, 255, 0.84);
}

.footer-bottom > div {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.footer-bottom strong {
  color: var(--paper);
}

.footer-bottom a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.legal-links {
  justify-content: flex-end;
  font-size: 12px;
  text-transform: uppercase;
}

@media (max-width: 960px) {
  .site-header {
    min-height: 72px;
    padding: 0 22px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: var(--paper);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 16px 22px 22px;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 12px 0;
  }

  .site-nav .nav-cta {
    text-align: center;
    margin-top: 8px;
  }

  h1 {
    font-size: 46px;
  }

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

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

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    padding: 28px 0;
  }

  .legal-links {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  body {
    font-size: 15px;
  }

  .announcement {
    min-height: 40px;
    font-size: 12px;
    text-align: center;
  }

  .brand {
    min-width: 0;
    font-size: 21px;
  }

  .page-hero,
  .filters,
  .papers-section,
  .cta-band,
  .site-footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .page-hero {
    padding-top: 44px;
    padding-bottom: 38px;
  }

  .hero-title-row {
    padding-bottom: 38px;
  }

  h1 {
    font-size: 42px;
  }

  .dot-matrix {
    width: 34px;
    height: 34px;
  }

  .filter-row {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
  }

  .filter-chip {
    flex: 0 0 auto;
  }

  .papers-section {
    padding-top: 38px;
    padding-bottom: 58px;
  }

  .papers-heading {
    display: block;
  }

  .papers-heading h2 {
    font-size: 22px;
    margin-bottom: 8px;
  }

  .papers-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .paper-image strong {
    font-size: 20px;
  }

  .paper-card p {
    min-height: 0;
  }

  .cta-band {
    min-height: 260px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    margin-bottom: 48px;
  }

  .cta-band h2 {
    font-size: 31px;
  }

  .cta-band p {
    font-size: 16px;
  }

  .footer-statement {
    font-size: 34px;
    margin-bottom: 42px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 42px;
  }

  .footer-bottom > div {
    display: block;
  }

  .footer-bottom strong,
  .footer-bottom span,
  .footer-bottom a {
    display: block;
    margin-bottom: 8px;
  }
}