*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #F2F5F7;
  background-color: #0B0E14;
  -webkit-font-smoothing: antialiased;
}

:root {
  --color-ink: #0B0E14;
  --color-panel: #141A24;
  --color-red: #FF2E4D;
  --color-blue: #00C2FF;
  --color-silver: #A8B4C0;
  --text-high: #F2F5F7;
  --text-low: #B0B8C4;
  --gradient-energy: linear-gradient(135deg, #FF2E4D, #00C2FF);
  --border-faint: rgba(255,255,255,0.08);
  --red-dark: #7A1E30;
  --blue-dark: #123A5C;
  --font-display: "Alibaba PuHuiTi", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-base: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "JetBrains Mono", monospace;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--color-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--color-red);
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.25rem;
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
  border-radius: 2px;
}

main:focus {
  outline: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: #0B0E14;
  color: #F2F5F7;
  padding: 10px 16px;
  border: 1px solid var(--color-blue);
  z-index: 300;
  text-decoration: none;
}

.skip-link:focus {
  left: 8px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-silver);
}

.display-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1;
}

.section-title {
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 800;
}

.shell {
  max-width: 1280px;
  margin: 0 auto;
}

.shell-narrow {
  max-width: 900px;
  margin: 0 auto;
}

.section {
  padding: 56px 20px;
}

.section-sm {
  padding: 32px 20px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-red), var(--color-blue));
  transform-origin: 0 50%;
  transform: scaleX(var(--scroll-progress, 0));
  z-index: 1000;
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(11, 14, 20, 0.96);
  border-bottom: 1px solid var(--border-faint);
}

.site-header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 20px;
  max-width: 1440px;
  margin: 0 auto;
}

.header-masthead {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.masthead-kicker {
  display: none;
}

.masthead-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1;
  color: var(--text-high);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.masthead-intro {
  display: none;
}

.masthead-mark {
  display: none;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border-faint);
  background: transparent;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle-icon {
  position: relative;
  width: 18px;
  height: 2px;
  background: var(--text-high);
  display: block;
  transition: background 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--text-high);
  transition: transform 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-toggle-text {
  display: none;
}

.site-nav {
  flex-basis: 100%;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transition: max-height 0.35s ease, opacity 0.2s ease, visibility 0s linear 0.35s;
}

.site-nav[data-open] {
  max-height: 80vh;
  overflow-y: auto;
  opacity: 1;
  visibility: visible;
  transition: max-height 0.35s ease, opacity 0.25s ease, visibility 0s;
}

.site-nav-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-top: 1px solid var(--border-faint);
  display: grid;
}

.nav-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.site-nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 4px;
  color: var(--text-low);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-nav-link:hover {
  color: var(--text-high);
  padding-left: 8px;
}

.site-nav-link[aria-current="page"] {
  color: var(--text-high);
  font-weight: 700;
}

.site-nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-energy);
}

.nav-link-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-silver);
  opacity: 0.7;
}

.site-nav-link[aria-current="page"] .nav-link-num {
  color: var(--color-red);
  opacity: 1;
}

.nav-link-label {
  font-size: inherit;
  font-weight: inherit;
  line-height: 1.4;
}

.nav-link-rule {
  display: none;
}

@media (min-width: 1024px) {
  body {
    padding-left: 340px;
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 340px;
    height: 100vh;
    background: var(--color-ink);
    border-right: 1px solid var(--border-faint);
    border-bottom: 0;
    overflow-y: auto;
  }

  .site-header::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(120% 80% at 80% 20%, rgba(0, 194, 255, 0.08), transparent 50%);
    pointer-events: none;
    z-index: 0;
  }

  .site-header-inner {
    position: relative;
    z-index: 1;
    min-height: 100%;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 56px 36px 40px;
    max-width: none;
  }

  .header-masthead {
    display: block;
    text-align: center;
    padding: 0 8px 40px;
    margin-bottom: 48px;
    border-bottom: 1px solid var(--border-faint);
  }

  .masthead-kicker {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    color: var(--color-silver);
    text-transform: uppercase;
    margin-bottom: 12px;
  }

  .masthead-brand {
    display: block;
    font-size: 34px;
  }

  .masthead-intro {
    display: block;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-low);
    margin: 18px auto 0;
    max-width: 220px;
  }

  .masthead-mark {
    display: block;
    width: 43px;
    height: 10px;
    margin: 22px auto 0;
    background: var(--gradient-energy);
    clip-path: polygon(6% 0, 94% 0, 100% 100%, 0 100%);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    flex-basis: auto;
    max-height: none;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    margin-top: auto;
    transition: none;
  }

  .site-nav[data-open] {
    max-height: none;
    overflow: visible;
  }

  .site-nav-list {
    border-top: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
  }

  .nav-item {
    border-bottom: 1px solid var(--border-faint);
    position: relative;
  }

  .site-nav-link {
    padding: 17px 12px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.02em;
    border-left: 3px solid transparent;
    color: var(--color-low);
    z-index: 1;
  }

  .site-nav-link::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    background: linear-gradient(90deg, rgba(255, 46, 77, 0.15), rgba(0, 194, 255, 0.08));
    clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
    z-index: -1;
    opacity: 0;
    transform: translateX(-12px);
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  .site-nav-link:hover::before,
  .site-nav-link[aria-current="page"]::before {
    opacity: 1;
    transform: translateX(0);
  }

  .site-nav-link:hover {
    color: var(--text-high);
    padding-left: 16px;
  }

  .site-nav-link[aria-current="page"] {
    color: var(--text-high);
    border-left-color: var(--color-red);
  }

  .site-nav-link[aria-current="page"]::after {
    display: none;
  }

  .nav-link-num {
    font-size: 12px;
    color: var(--color-silver);
    opacity: 1;
    min-width: 28px;
  }

  .site-nav-link[aria-current="page"] .nav-link-num {
    color: var(--color-red);
  }

  .nav-link-rule {
    display: block;
    flex: 1;
    height: 1px;
    margin-left: auto;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.15), transparent);
  }
}

.site-footer {
  background: var(--color-panel);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-red), var(--color-blue));
}

.site-footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 20px 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 32px;
  margin: 0;
  color: var(--text-high);
}

.footer-brand-tag {
  color: var(--color-silver);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 4px 0 16px;
}

.footer-brand-about {
  color: var(--text-low);
  font-size: 14px;
  line-height: 1.6;
  max-width: 320px;
}

.footer-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-silver);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 14px;
  padding-top: 20px;
  border-top: 1px solid var(--border-faint);
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-list li {
  margin-bottom: 8px;
}

.footer-list a {
  color: var(--text-low);
  text-decoration: none;
  font-size: 14px;
}

.footer-list a:hover {
  color: var(--color-red);
}

.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-faint);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.footer-trust {
  color: var(--text-low);
  font-size: 14px;
  margin: 0;
}

.footer-copy,
.footer-icp {
  color: var(--color-silver);
  font-size: 13px;
  margin: 0;
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 48px;
  }

  .footer-title {
    padding-top: 0;
    border-top: 0;
  }

  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-red), var(--color-blue));
  color: #FFFFFF;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 46, 77, 0.25);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-silver);
  color: var(--text-high);
}

.btn-ghost:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 0;
  margin: 0 0 24px;
  list-style: none;
  font-size: 14px;
  color: var(--text-low);
}

.breadcrumb li + li::before {
  content: "→";
  margin-right: 8px;
  color: var(--color-red);
}

.breadcrumb a {
  color: var(--color-silver);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-blue);
}

.page-heading {
  padding: 32px 20px;
}

.page-heading-main {
  font-size: clamp(36px, 8vw, 88px);
  line-height: 1;
  margin: 0 0 12px;
  letter-spacing: -0.04em;
  font-weight: 900;
  text-transform: uppercase;
}

.collage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.collage-item {
  background: var(--color-panel);
  border: 1px solid var(--border-faint);
  border-radius: 4px;
  padding: 24px;
  position: relative;
  overflow: hidden;
  min-height: 160px;
}

.collage-item::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 6px;
  background: var(--gradient-energy);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

@media (min-width: 768px) {
  .collage-grid {
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: minmax(120px, auto);
  }

  .collage-item.tile-lg {
    grid-column: span 8;
  }

  .collage-item.tile-md {
    grid-column: span 4;
  }

  .collage-item.tile-sm {
    grid-column: span 6;
  }

  .collage-item.tile-xs {
    grid-column: span 3;
  }
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--color-panel);
  border: 1px solid var(--border-faint);
  padding: 24px;
  border-radius: 4px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--color-blue);
}

.card-stack {
  position: relative;
  background: var(--color-panel);
  padding: 24px;
  border: 1px solid var(--border-faint);
}

.card-stack::before,
.card-stack::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 100%;
  height: 100%;
  border: 1px solid var(--border-faint);
  z-index: -1;
}

.card-stack::after {
  right: -12px;
  bottom: -12px;
}

.study-card {
  background: var(--color-panel);
  border: 1px solid var(--border-faint);
  padding: 28px 24px;
  position: relative;
  border-left: 3px solid var(--color-red);
}

.study-card-title {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 8px;
}

.study-card-summary {
  color: var(--text-low);
  font-size: 15px;
  margin: 0;
}

.evidence-box {
  border: 1px solid rgba(0, 194, 255, 0.4);
  background: rgba(0, 194, 255, 0.06);
  padding: 24px;
  position: relative;
  margin: 24px 0;
}

.evidence-box::before {
  content: "证据";
  position: absolute;
  top: -11px;
  left: 16px;
  background: var(--color-ink);
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--color-blue);
  text-transform: uppercase;
}

.term-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border: 1px solid var(--border-faint);
  background: var(--color-panel);
  color: var(--color-silver);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.term-chip::before {
  content: "#";
  color: var(--color-red);
}

.more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-blue);
  text-decoration: none;
  font-weight: 600;
}

.more-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.more-link:hover::after {
  transform: translateX(4px);
}

.img-frame {
  position: relative;
  display: block;
  width: 100%;
  background: var(--color-panel);
  border: 1px solid var(--border-faint);
  overflow: hidden;
}

.img-frame::before {
  content: "";
  display: block;
}

.img-frame.ratio-16x9::before {
  padding-top: 56.25%;
}

.img-frame.ratio-4x3::before {
  padding-top: 75%;
}

.img-frame.ratio-1x1::before {
  padding-top: 100%;
}

.img-frame.ratio-3x2::before {
  padding-top: 66.67%;
}

.img-frame .img-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-silver);
  font-size: 13px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: radial-gradient(120% 120% at 20% 20%, rgba(0, 194, 255, 0.15), rgba(255, 46, 77, 0.08) 50%, transparent);
}

.stat {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-high);
  margin: 0;
}

.stat-label {
  font-size: 13px;
  color: var(--color-silver);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.timeline {
  position: relative;
  margin: 32px 0;
  padding: 0;
  list-style: none;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-red), var(--color-blue));
  opacity: 0.4;
}

.timeline-item {
  position: relative;
  padding: 8px 0 24px 32px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 16px;
  width: 10px;
  height: 10px;
  background: var(--color-ink);
  border: 2px solid var(--color-red);
  border-radius: 50%;
}

.timeline-item.is-visible::before {
  box-shadow: 0 0 0 4px rgba(255, 46, 77, 0.2);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

[data-section-spy].is-active {
  color: var(--color-red);
  border-color: var(--color-red);
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}