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

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

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-gray-900);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin: 0;
}

ul[class] {
  list-style: none;
  padding: 0;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

a {
  color: var(--color-electric);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
}

:root {
  --color-navy-900: #060B14;
  --color-navy-800: #0A1220;
  --color-navy-700: #152A43;
  --color-orange: #FF6B35;
  --color-electric: #00B4D8;
  --color-cyan: #00E5FF;
  --color-purple: #7B2CBF;
  --color-white: #fff;
  --color-gray-100: #F0F4F8;
  --color-gray-300: #D3DCE6;
  --color-gray-500: #8892A6;
  --color-gray-900: #1A1A1A;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Courier New", monospace;
  --container: 1280px;
  --gap: 24px;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(6, 11, 20, .08);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-sans);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-navy-800);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  max-width: 65ch;
}

.container {
  width: min(var(--container), 100% - 40px);
  margin-inline: auto;
}

.section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
}

.section-alt {
  background: var(--color-gray-100);
}

.section-navy {
  background: var(--color-navy-800);
  color: rgba(255, 255, 255, .85);
}

.section-navy h2,
.section-navy h3 {
  color: #fff;
}

.section-navy .section-header p {
  color: rgba(255, 255, 255, .6);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.section-kicker {
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--color-electric);
}

.section-header p {
  max-width: 46ch;
  color: var(--color-gray-500);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding: 1.5rem 0 .5rem;
  font-family: var(--font-mono);
  font-size: .875rem;
  color: var(--color-gray-500);
}

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

.breadcrumb span[aria-hidden="true"] {
  color: var(--color-gray-300);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .9rem 1.5rem;
  border-radius: 6px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, color .15s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-orange);
  color: #fff;
  box-shadow: 0 6px 18px rgba(255, 107, 53, .28);
}

.btn-primary:hover {
  background: #e85c26;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(255, 107, 53, .35);
}

.btn-outline {
  border-color: var(--color-electric);
  color: var(--color-electric);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(0, 180, 216, .1);
  color: var(--color-electric);
}

.btn-light {
  background: #fff;
  color: var(--color-navy-800);
}

.btn-light:hover {
  background: var(--color-gray-100);
  color: var(--color-navy-800);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .3rem .7rem;
  border-radius: 3px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  line-height: 1.4;
}

.badge-cyan {
  color: var(--color-cyan);
  border-color: rgba(0, 229, 255, .4);
  background: rgba(0, 229, 255, .08);
}

.badge-orange {
  color: var(--color-orange);
  border-color: rgba(255, 107, 53, .4);
  background: rgba(255, 107, 53, .1);
}

.badge-purple {
  color: var(--color-purple);
  border-color: rgba(123, 44, 191, .35);
  background: rgba(123, 44, 191, .08);
}

.badge-navy {
  background: var(--color-navy-800);
  color: #fff;
}

.card {
  padding: 1.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-gray-300);
  background: var(--color-white);
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(6, 11, 20, .1);
}

.card-dark {
  background: var(--color-navy-700);
  border-color: rgba(255, 255, 255, .08);
  color: rgba(255, 255, 255, .85);
}

.card-dark:hover {
  border-color: rgba(0, 229, 255, .35);
}

.card-pad {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.data-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1.25rem;
}

.data-number {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-electric);
  font-variant-numeric: tabular-nums;
}

.data-label {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-gray-500);
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1rem, 3vw, 1.5rem);
}

.stat-cell {
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--color-gray-300);
  background: var(--color-white);
}

.stat-cell .data-number {
  font-size: 2rem;
}

.stat-cell .data-label {
  font-size: .6875rem;
}

.grid-panel {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap);
}

.path-step {
  position: relative;
  padding: 0 0 2.25rem 2.25rem;
}

.path-step::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 22px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-electric), var(--color-purple));
}

.path-step:last-child::before {
  display: none;
}

.path-step::after {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-navy-800);
  border: 3px solid var(--color-orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, .15);
}

.path-step-title {
  margin-bottom: .35rem;
  font-size: 1.125rem;
  font-weight: 900;
  color: var(--color-navy-800);
}

.path-step-body {
  max-width: 52ch;
  color: var(--color-gray-500);
}

.glass-panel {
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, .16);
  background: rgba(255, 255, 255, .08);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: #fff;
}

.glass-panel h3,
.glass-panel .path-step-title {
  color: #fff;
}

.glass-panel .path-step-body {
  color: rgba(255, 255, 255, .75);
}

.glass-panel .path-step::after {
  background: rgba(255, 255, 255, .08);
}

.media-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--color-gray-300);
  background: linear-gradient(135deg, rgba(0, 180, 216, .12), rgba(123, 44, 191, .1)), var(--color-gray-100);
  color: var(--color-gray-500);
  font-family: var(--font-mono);
  font-size: .875rem;
  letter-spacing: .2em;
}

.media-frame.is-dark {
  border-color: rgba(255, 255, 255, .08);
  background: linear-gradient(135deg, rgba(0, 229, 255, .08), rgba(123, 44, 191, .12)), var(--color-navy-800);
  color: rgba(255, 255, 255, .5);
}

.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-navy-800);
  color: #fff;
}

.header-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  width: min(var(--container), 100% - 40px);
  margin-inline: auto;
  padding-top: .75rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .55);
}

.header-topline span::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-orange);
  margin-right: .5rem;
  vertical-align: 1px;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  width: min(var(--container), 100% - 40px);
  margin-inline: auto;
  padding: 1.25rem 0 .75rem;
}

.masthead-side {
  display: flex;
  align-items: center;
}

.masthead-side-left {
  justify-content: flex-start;
}

.masthead-side-right {
  justify-content: flex-end;
}

.masthead-meta {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .6);
}

.masthead-meta::before {
  content: "●";
  color: var(--color-orange);
  margin-right: .5rem;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  text-decoration: none;
}

.site-logo-mark {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  transition: transform .22s ease;
}

.site-logo-mark::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.site-logo-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 10px;
  background: var(--color-orange);
  transform: translate(-50%, -50%) rotate(45deg);
}

.site-logo:hover .site-logo-mark {
  transform: rotate(90deg);
}

.site-logo-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.1;
}

.site-logo-cn {
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: .08em;
  color: #fff;
}

.site-logo-en {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: .5625rem;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--color-cyan);
}

.site-nav {
  background: var(--color-navy-900);
  border-top: 1px solid rgba(255, 255, 255, .06);
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}

.nav-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2.5rem);
  width: min(var(--container), 100% - 40px);
  margin: 0 auto;
  padding: .25rem 0;
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: .875rem .15rem;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .02em;
  color: rgba(255, 255, 255, .85);
  text-decoration: none;
  transition: color .15s ease;
}

.nav-link::before {
  content: attr(data-index);
  margin-right: .35rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  color: var(--color-cyan);
  opacity: .8;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(90deg, var(--color-orange), var(--color-cyan));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .18s ease;
}

.nav-link:hover {
  color: #fff;
  text-decoration: none;
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: #fff;
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"]::before {
  color: var(--color-orange);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .75rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, .2);
  background: none;
  color: #fff;
  font-size: .875rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle-box span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .2s ease, opacity .2s ease;
}

.edge-rail {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  width: 56px;
  height: 100vh;
  padding: 24px 0;
  background: var(--color-navy-900);
  border-right: 1px solid rgba(0, 229, 255, .18);
}

.rail-mark {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-orange);
  box-shadow: 0 0 12px rgba(255, 107, 53, .7);
}

.rail-mark::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid var(--color-orange);
  animation: railPulse 2s ease-out infinite;
}

.rail-text {
  writing-mode: vertical-rl;
  font-weight: 900;
  font-size: .875rem;
  letter-spacing: .3em;
  color: rgba(255, 255, 255, .7);
}

.rail-year {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .2em;
  color: var(--color-cyan);
}

@keyframes railPulse {
  0% {
    transform: scale(.6);
    opacity: 1;
  }
  100% {
    transform: scale(1.4);
    opacity: 0;
  }
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 56px;
  z-index: 2000;
  padding: .75rem 1.25rem;
  border-radius: 0 0 8px 8px;
  background: var(--color-orange);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: top .18s ease;
}

.skip-link:focus {
  top: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2001;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-cyan));
  pointer-events: none;
}

.back-btn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, .35);
  background: var(--color-navy-800);
  color: #fff;
  font-size: .875rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(6, 11, 20, .25);
}

.back-btn::before {
  content: "↑";
  font-size: 1.1rem;
  line-height: 1;
}

.back-btn.is-visible {
  display: inline-flex;
}

.site-footer {
  background: var(--color-navy-800);
  color: rgba(255, 255, 255, .75);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr .8fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding: clamp(3.5rem, 8vw, 5.5rem) 0 3rem;
}

.footer-brand .footer-logo {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: .12em;
  color: #fff;
}

.footer-desc {
  margin: 1rem 0 1.25rem;
  max-width: 30ch;
  color: rgba(255, 255, 255, .6);
  font-size: .95rem;
  line-height: 1.7;
}

.footer-trust {
  display: inline-block;
  padding: .35rem .7rem;
  border-radius: 4px;
  border: 1px solid rgba(0, 229, 255, .28);
  background: rgba(0, 180, 216, .08);
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
}

.footer-title {
  margin-bottom: 1.1rem;
  font-size: .85rem;
  font-weight: 900;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #fff;
}

.footer-links,
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: .55rem;
}

.footer-links a {
  color: rgba(255, 255, 255, .65);
  font-size: .95rem;
  transition: color .15s ease;
}

.footer-links a:hover {
  color: var(--color-cyan);
  text-decoration: none;
}

.footer-contact span {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  color: rgba(255, 255, 255, .65);
  font-size: .9rem;
  line-height: 1.6;
}

.footer-contact span::before {
  content: "→";
  flex-shrink: 0;
  font-family: var(--font-mono);
  color: var(--color-electric);
}

.footer-bottom {
  padding: 1.25rem 0;
  border-top: 1px solid rgba(255, 255, 255, .08);
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  width: min(var(--container), 100% - 40px);
  margin-inline: auto;
  color: rgba(255, 255, 255, .45);
  font-size: .875rem;
}

.footer-worknote {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--color-electric);
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .45s ease, transform .45s ease;
}

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

@media (min-width: 1200px) {
  body {
    padding-left: 56px;
  }
}

@media (max-width: 1199px) {
  .edge-rail {
    display: none;
  }
  .skip-link {
    left: 1rem;
  }
}

@media (max-width: 960px) {
  .grid-panel {
    grid-template-columns: repeat(6, 1fr);
  }
  .nav-toggle {
    display: inline-flex;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-navy-900);
    box-shadow: 0 20px 30px rgba(6, 11, 20, .3);
  }
  .site-nav[data-open="true"] {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    padding: .75rem 1.5rem 1.25rem;
  }
  .nav-link {
    display: block;
    padding: .875rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, .06);
  }
  .nav-link::after {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .stat-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.65rem;
  }
  .header-topline {
    justify-content: center;
  }
  .header-topline .topline-note:last-child {
    display: none;
  }
  .masthead-meta {
    display: none;
  }
  .site-logo-cn {
    font-size: 1.35rem;
  }
  .site-logo-en {
    letter-spacing: .24em;
  }
  .nav-toggle-text {
    display: none;
  }
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

@media (max-width: 600px) {
  .grid-panel {
    display: block;
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom-inner {
    justify-content: center;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .btn:hover,
  .card:hover {
    transform: none;
  }
}