:root {
  --bg: #fcfbf8;
  --bg-soft: #f6f3ee;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --surface-alt: #f3efe8;
  --text: #2a2a29;
  --text-secondary: rgba(42, 42, 41, 0.72);
  --text-tertiary: rgba(42, 42, 41, 0.44);
  --border: rgba(42, 42, 41, 0.10);
  --border-strong: rgba(42, 42, 41, 0.16);
  --accent: #ff596c;
  --accent-strong: #eb4f62;
  --accent-soft: rgba(255, 89, 108, 0.10);
  --shadow-sm: 0 10px 24px rgba(36, 33, 28, 0.05);
  --shadow: 0 18px 44px rgba(36, 33, 28, 0.08);
  --shadow-lg: 0 28px 70px rgba(36, 33, 28, 0.10);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-sans: "Noto Sans", "Noto Sans CJK SC", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Noto Serif", "Noto Serif CJK SC", Georgia, "Times New Roman", serif;
  --brand-gradient: linear-gradient(135deg, #ffc845 0%, #ff7a59 48%, #ff516c 100%);
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html {
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 201, 89, 0.16), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(255, 89, 108, 0.10), transparent 26%),
    linear-gradient(180deg, #fffdfa 0%, var(--bg) 20%, #fbfaf7 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  min-height: 100vh;
  position: relative;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(42, 42, 41, 0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(42, 42, 41, 0.025) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.22), transparent 70%);
  opacity: 0.45;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; }

.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;
}

.shell {
  width: min(1180px, calc(100% - 56px));
  margin: 0 auto;
  padding: 24px 0 64px;
  position: relative;
  z-index: 1;
}
.shell--narrow { width: min(1040px, calc(100% - 56px)); }

.topbar {
  position: sticky;
  top: 16px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
  padding: 18px 22px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: 0 8px 20px rgba(255, 89, 108, 0.24);
  font-weight: 800;
}
.brand strong {
  display: block;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand small {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-tertiary);
}
.topbar nav {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.topbar nav a {
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  transition: color var(--transition), transform var(--transition);
}
.topbar nav a:hover {
  color: var(--text);
  transform: translateY(-1px);
}

.hero,
.page-hero,
.paper-page {
  animation: riseIn 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 40px;
  align-items: start;
  margin-top: 52px;
}
.hero-copy {
  padding-top: 0;
}
.hero-side {
  display: grid;
  gap: 16px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text-tertiary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hero h1,
.page-hero h1,
.paper-page h1 {
  font-family: var(--font-serif);
  color: var(--text);
  letter-spacing: -0.04em;
}
.hero h1 {
  margin: 20px 0 18px;
  font-size: clamp(2.2rem, 3.7vw, 3.45rem);
  line-height: 1.08;
  max-width: 15ch;
}
.page-hero,
.paper-page {
  margin-top: 44px;
}
.page-hero h1 {
  margin: 18px 0 16px;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1.06;
}
.paper-page h1 {
  margin: 10px 0 18px;
  font-size: clamp(2.3rem, 4vw, 3.6rem);
  line-height: 1.08;
}
.hero p,
.page-hero p,
.paper-page > p,
.lead {
  margin: 0;
  max-width: 720px;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.82;
}
.hero-actions,
.paper-actions,
.paper-side-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.hero-actions { margin-top: 28px; }
.paper-actions { margin-top: 24px; }
.paper-side-actions { margin-top: 18px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}
.button:hover {
  transform: translateY(-1px);
}
.button.primary {
  background: var(--text);
  border-color: var(--text);
  color: #fff;
  box-shadow: 0 10px 24px rgba(42, 42, 41, 0.16);
}
.button.primary:hover {
  background: #1c1c1b;
}
.button.secondary {
  background: rgba(255, 255, 255, 0.76);
  border-color: var(--border);
  color: var(--text);
}
.button.secondary:hover {
  background: var(--surface-alt);
  border-color: var(--border-strong);
}
.text-link,
.meta-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  transition: color var(--transition), transform var(--transition);
}
.text-link::after,
.meta-link::after {
  content: "↗";
  font-size: 12px;
}
.text-link:hover,
.meta-link:hover {
  color: var(--accent-strong);
  transform: translateX(2px);
}

.feature-panel,
.hero-card,
.metric-card,
.guide-card,
.paper-sidecard,
.paper-meta-grid div,
.empty-state {
  border: 1px solid rgba(255, 255, 255, 0.88);
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}
.feature-panel {
  padding: 26px;
  border-radius: var(--radius-xl);
}
.feature-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-tertiary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.feature-label {
  color: var(--accent-strong);
}
.feature-panel h2 {
  margin: 14px 0 10px;
  font-family: var(--font-serif);
  font-size: 1.55rem;
  line-height: 1.24;
  letter-spacing: -0.03em;
}
.feature-panel-image {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 20px;
  margin-bottom: 18px;
  border: 1px solid rgba(42, 42, 41, 0.08);
  box-shadow: var(--shadow-sm);
}
.feature-panel p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
}
.feature-panel .paper-tags {
  margin-top: 18px;
}
.feature-panel .text-link {
  margin-top: 18px;
}
.hero-card {
  padding: 14px;
  border-radius: var(--radius-xl);
}
.hero-stat-grid {
  display: grid;
  gap: 12px;
}
.hero-card div {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(42, 42, 41, 0.06);
}
.hero-card span,
.paper-meta-grid span,
.paper-sidecard-block span,
.metric-card span {
  display: block;
  margin-bottom: 8px;
  color: var(--text-tertiary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.hero-card strong,
.paper-meta-grid strong,
.paper-sidecard-block strong,
.metric-card strong {
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  font-weight: 600;
}
.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}
.metric-strip--compact {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 28px;
}
.metric-card {
  min-height: 100%;
  padding: 24px;
  border-radius: var(--radius-lg);
}
.metric-card p {
  margin: 12px 0 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
  gap: 20px;
  align-items: end;
  margin-top: 64px;
  margin-bottom: 18px;
}
.section-heading--compact {
  margin-top: 72px;
}
.section-heading h2 {
  margin: 18px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.section-heading p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.search-box {
  flex: 1;
  max-width: 460px;
}
.search-box input {
  width: 100%;
  min-height: 50px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.search-box input:focus {
  border-color: rgba(255, 89, 108, 0.28);
  background: var(--surface-strong);
  box-shadow: 0 0 0 4px rgba(255, 89, 108, 0.10);
}
.search-box input::placeholder {
  color: var(--text-tertiary);
}
.toolbar-meta {
  color: var(--text-tertiary);
  font-size: 13px;
  white-space: nowrap;
}
.tag-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(42, 42, 41, 0.08);
  background: rgba(255, 255, 255, 0.78);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  transition: transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
}
.tag:hover,
.filter-tag.is-active {
  transform: translateY(-1px);
  border-color: rgba(255, 89, 108, 0.22);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.paper-list {
  margin-top: 24px;
  display: grid;
  gap: 16px;
}
.paper-card {
  padding: 28px 30px;
  border-radius: var(--radius-lg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}
.paper-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.paper-card-meta,
.paper-card-footer {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}
.paper-kicker {
  margin: 0;
  color: var(--text-tertiary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.paper-date {
  margin: 0;
  color: var(--text-tertiary);
  font-size: 13px;
}
.paper-card-body {
  margin-top: 12px;
}
.paper-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.32rem, 2vw, 1.7rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
}
.paper-title a {
  transition: color var(--transition);
}
.paper-title a:hover {
  color: var(--accent-strong);
}
.paper-authors {
  margin: 10px 0 0;
  color: var(--text-tertiary);
  font-size: 13px;
}
.paper-summary {
  margin: 14px 0 0;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}
.paper-card-footer {
  margin-top: 20px;
  align-items: end;
}
.paper-card .paper-actions {
  margin-top: 0;
  justify-content: flex-end;
  flex-shrink: 0;
}

.empty-state {
  padding: 56px 30px;
  border-radius: var(--radius-lg);
  text-align: center;
}
.empty-state strong {
  display: block;
  margin-bottom: 10px;
  color: var(--text);
  font-size: 1.08rem;
}
.empty-state span {
  color: var(--text-secondary);
  line-height: 1.8;
}

.empty-guide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.guide-card {
  padding: 30px;
  border-radius: var(--radius-lg);
}
.guide-card h2,
.paper-section h2 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 1.28rem;
  line-height: 1.22;
  letter-spacing: -0.02em;
}
.guide-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.9;
}
.guide-card pre {
  margin: 0;
  padding: 18px;
  border-radius: 16px;
  overflow: auto;
  border: 1px solid rgba(42, 42, 41, 0.07);
  background: rgba(255, 255, 255, 0.74);
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.65;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 72px;
  padding-top: 20px;
  border-top: 1px solid rgba(42, 42, 41, 0.08);
  color: var(--text-tertiary);
  font-size: 13px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
  color: var(--text-tertiary);
  font-size: 13px;
}
.breadcrumbs a {
  transition: color var(--transition);
}
.breadcrumbs a:hover {
  color: var(--text);
}

.paper-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 38px;
  align-items: start;
}
.paper-main {
  min-width: 0;
}
.paper-page-header {
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(42, 42, 41, 0.08);
}
.paper-sidecard {
  position: sticky;
  top: 108px;
  padding: 18px;
  border-radius: var(--radius-lg);
}
.paper-sidecard-block + .paper-sidecard-block {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(42, 42, 41, 0.08);
}
.paper-sidecard-block strong,
.paper-sidecard-block a {
  display: block;
  word-break: break-word;
}
.paper-side-actions .button {
  width: 100%;
}
.paper-side-actions .button + .button {
  margin-top: 8px;
}
.paper-meta-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}
.paper-meta-grid div {
  padding: 16px;
  border-radius: 16px;
}
.paper-section {
  margin-top: 34px;
}
.entry-cover {
  margin: 30px 0 0;
}
.entry-cover img {
  display: block;
  width: 100%;
  border-radius: 24px;
  border: 1px solid rgba(42, 42, 41, 0.08);
  box-shadow: var(--shadow);
}
.paper-section p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.85;
}
.lead {
  font-size: 1.08rem;
}

.paper-body {
  margin-top: 34px;
  padding-top: 32px;
  border-top: 1px solid rgba(42, 42, 41, 0.08);
  font-size: 16px;
  line-height: 1.85;
}
.paper-body h1,
.paper-body h2,
.paper-body h3 {
  font-family: var(--font-serif);
  color: var(--text);
  letter-spacing: -0.02em;
}
.paper-body h1 {
  margin: 2.8rem 0 0.9rem;
  font-size: 1.7rem;
}
.paper-body h2 {
  margin: 2.4rem 0 0.9rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid rgba(42, 42, 41, 0.08);
  font-size: 1.42rem;
}
.paper-body h3 {
  margin: 1.8rem 0 0.65rem;
  font-size: 1.16rem;
}
.paper-body p,
.paper-body ul,
.paper-body ol,
.paper-body li,
.paper-body td {
  color: var(--text-secondary);
}
.paper-body p { margin: 0.9em 0; }
.paper-body ul,
.paper-body ol {
  margin: 0.8em 0;
  padding-left: 1.45em;
}
.paper-body li { margin: 0.35em 0; }
.paper-body img {
  display: block;
  margin: 1.6em auto;
  border-radius: 18px;
  border: 1px solid rgba(42, 42, 41, 0.08);
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.72);
}
.paper-body a {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255, 89, 108, 0.3);
}
.paper-body a:hover {
  text-decoration-color: rgba(255, 89, 108, 0.72);
}
.paper-body table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  margin: 1.6em 0;
  border-radius: 16px;
  border-style: hidden;
  box-shadow: 0 0 0 1px rgba(42, 42, 41, 0.08);
}
.paper-body th,
.paper-body td {
  padding: 12px 14px;
  border: 1px solid rgba(42, 42, 41, 0.07);
  text-align: left;
}
.paper-body th {
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.paper-body tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.56);
}
.paper-body code {
  padding: 2px 7px;
  border-radius: 8px;
  background: rgba(255, 89, 108, 0.08);
  color: var(--accent-strong);
  font-size: 0.9em;
}
.paper-body pre {
  margin: 1.3em 0;
  padding: 18px 20px;
  border-radius: 16px;
  overflow-x: auto;
  background: #1f1f1f;
  color: #e8e8e8;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.paper-body pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}
.paper-body blockquote {
  margin: 1.3em 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  border-radius: 0 16px 16px 0;
  background: rgba(255, 255, 255, 0.72);
}
.paper-body strong { color: var(--text); }
.paper-body hr {
  border: 0;
  border-top: 1px solid rgba(42, 42, 41, 0.08);
  margin: 2.6em 0;
}

.muted { color: var(--text-tertiary); }
[hidden] { display: none !important; }

@keyframes riseIn {
  from { transform: translateY(12px); }
  to { transform: translateY(0); }
}

@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { padding-top: 0; }
  .paper-layout { grid-template-columns: 1fr; }
  .paper-sidecard {
    position: static;
    order: -1;
  }
}

@media (max-width: 920px) {
  .shell,
  .shell--narrow { width: calc(100% - 32px); }
  .topbar {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    border-radius: 24px;
    padding: 18px;
  }
  .topbar nav { gap: 16px; }
  .metric-strip,
  .metric-strip--compact,
  .empty-guide,
  .section-heading,
  .paper-meta-grid {
    grid-template-columns: 1fr;
  }
  .toolbar,
  .paper-card-footer,
  .paper-card-meta,
  .footer {
    flex-direction: column;
    align-items: flex-start;
  }
  .search-box {
    max-width: none;
    width: 100%;
  }
  .paper-card {
    padding: 24px 22px;
  }
  .paper-card .paper-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .hero { margin-top: 36px; }
  .hero h1 { font-size: 2.35rem; }
  .page-hero h1,
  .paper-page h1 { font-size: 2rem; }
  .feature-panel,
  .hero-card,
  .metric-card,
  .guide-card,
  .paper-card,
  .paper-sidecard { padding-left: 18px; padding-right: 18px; }
  .button {
    width: 100%;
  }
  .paper-actions,
  .hero-actions,
  .paper-side-actions {
    width: 100%;
  }
  .paper-body { font-size: 15px; }
  .paper-body table { font-size: 12px; display: block; overflow-x: auto; }
}

.page-detail .breadcrumbs { margin-top: 18px; }