:root {
  --color-primary: #1A1A2E;
  --color-primary-alt: #16213E;
  --color-accent: #F5A623;
  --color-accent-alt: #FFD369;
  --color-neon-purple: #9B59B6;
  --color-neon-blue: #00D2FF;
  --color-text: #F5F5F5;
  --color-text-dim: #B0B0B0;
  --color-paper: #F8F8F2;
  --color-border: #2C2C3A;
  --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-heading-weight: 900;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-body-weight: 400;
  --container: 1200px;
  --container-padding: clamp(1rem, 4vw, 2.5rem);
  --duration: 0.3s;
  --easing: cubic-bezier(0.4, 0, 0.2, 1);
}

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--color-neon-blue) var(--color-primary);
}

body {
  position: relative;
  min-height: 100vh;
  background: var(--color-primary);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: var(--font-body-weight);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

::selection {
  background: var(--color-accent);
  color: var(--color-primary);
}

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

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

img {
  height: auto;
}

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

button {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration) var(--easing), background-color var(--duration) var(--easing), border-color var(--duration) var(--easing);
}

ul,
ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  line-height: 1.2;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

h3 {
  font-size: 1.5rem;
}

p {
  line-height: 1.75;
}

.container {
  width: min(100% - 2 * var(--container-padding), var(--container));
  margin-inline: auto;
}

.section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.section--paper {
  background: var(--color-paper);
  color: var(--color-primary);
}

.section--paper .section-title {
  color: var(--color-primary);
}

.section--paper .section-label {
  color: var(--color-primary);
}

.section--paper .text-note {
  color: #4A4A58;
  border-left-color: var(--color-accent);
}

.section--paper .panel {
  background: #FFFFFF;
  border-color: #DDDDDD;
}

.section--paper .panel-head {
  color: var(--color-primary);
}

.section--paper .metric {
  background: #FFFFFF;
  border-color: #DDDDDD;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2vw, 2rem);
}

.grid-asym {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: clamp(1.5rem, 3vw, 3rem);
}

.content-grid {
  max-width: 46rem;
}

.content-grid p,
.content-grid ul,
.content-grid ol,
.content-grid figure,
.content-grid blockquote {
  margin-bottom: 1.25rem;
}

.content-grid ul:not([class]) {
  list-style: disc;
  padding-left: 1.5em;
}

.content-grid ol:not([class]) {
  list-style: decimal;
  padding-left: 1.5em;
}

.text-note {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  line-height: 1.6;
  border-left: 2px solid var(--color-neon-blue);
  padding-left: 1rem;
}

.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 1000;
  background: var(--color-accent);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 0.75rem 1.25rem;
  clip-path: polygon(0 0, calc(100% - 0.5rem) 0, 100% 0.5rem, 100% 100%, 0% 100%);
}

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

.site-header {
  position: relative;
  background: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

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

.site-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.4rem var(--container-padding);
  background: var(--color-primary-alt);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

.topbar-note {
  letter-spacing: 0.02em;
}

.topbar-mail {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  font-variant-numeric: tabular-nums;
}

.header-main {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.75rem var(--container-padding) 1.5rem;
  max-width: calc(var(--container) + 2 * var(--container-padding));
  margin-inline: auto;
  position: relative;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  background: var(--color-accent);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.375rem;
  line-height: 1;
  clip-path: polygon(0 0, calc(100% - 0.5rem) 0, 100% 0.5rem, 100% 100%, 0% 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.375rem;
  letter-spacing: 0.06em;
}

.brand-sub {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent-alt);
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.site-nav a {
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.9rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
  transition: color var(--duration) var(--easing);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.25rem;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--duration) var(--easing);
}

.site-nav a:hover {
  color: var(--color-accent);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  min-width: 3rem;
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 0.3125rem;
  width: 1.25rem;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--duration) var(--easing), opacity var(--duration) var(--easing);
}

.nav-toggle-label {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(0.4375rem) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-0.4375rem) rotate(-45deg);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 4rem;
  height: 4rem;
  border-top: 2px solid var(--color-neon-blue);
  border-right: 2px solid var(--color-neon-blue);
  opacity: 0.3;
  pointer-events: none;
  z-index: 3;
}

.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: min(320px, 40vw);
  height: 3px;
  background: linear-gradient(90deg, var(--color-neon-purple), var(--color-neon-blue));
  z-index: 3;
}

.header-main::before {
  content: "";
  position: absolute;
  right: var(--container-padding);
  bottom: 6px;
  width: 120px;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--color-neon-blue) 0, var(--color-neon-blue) 1px, transparent 1px, transparent 8px);
  opacity: 0.25;
  pointer-events: none;
}

.site-footer {
  position: relative;
  background: var(--color-primary-alt);
  border-top: 1px solid var(--color-border);
  margin-top: 4rem;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(320px, 40vw);
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-neon-purple));
}

.footer-inner {
  max-width: calc(var(--container) + 2 * var(--container-padding));
  margin-inline: auto;
  padding: 3.5rem var(--container-padding) 1.5rem;
}

.footer-mast {
  display: grid;
  grid-template-columns: 5fr 3fr 4fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-slogan {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--color-accent);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

.footer-blurb {
  font-size: 0.9375rem;
  color: var(--color-text-dim);
  max-width: 28em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  display: inline-block;
  padding: 0.25rem 0;
  font-size: 0.875rem;
  color: var(--color-text);
  border-bottom: 1px solid transparent;
  transition: color var(--duration) var(--easing), border-color var(--duration) var(--easing);
}

.footer-links a::before {
  content: "→ ";
  color: var(--color-accent);
}

.footer-links a:hover {
  color: var(--color-accent);
  border-color: var(--color-border);
}

.footer-contact {
  font-style: normal;
  font-size: 0.875rem;
  color: var(--color-text-dim);
  line-height: 2;
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

.footer-copyright {
  letter-spacing: 0.02em;
}

.footer-trust {
  letter-spacing: 0.02em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.625rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  line-height: 1;
  transition: background-color var(--duration) var(--easing), color var(--duration) var(--easing), border-color var(--duration) var(--easing), transform var(--duration) var(--easing);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-primary-alt);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-primary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-primary);
}

.btn-accent:hover {
  background: var(--color-accent-alt);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  padding: 1rem 0;
}

.breadcrumb a {
  color: var(--color-text-dim);
  transition: color var(--duration) var(--easing);
}

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

.breadcrumb-sep {
  color: var(--color-neon-blue);
}

.section-label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-neon-blue);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.panel {
  background: var(--color-primary-alt);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-neon-purple);
  margin-bottom: 1rem;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: color var(--duration) var(--easing);
}

.panel-head[aria-expanded="true"] {
  color: var(--color-accent);
}

.panel-indicator {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--color-border);
  background: var(--color-primary);
  color: var(--color-accent);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--duration) var(--easing), background-color var(--duration) var(--easing), color var(--duration) var(--easing), border-color var(--duration) var(--easing);
}

.panel.is-open .panel-indicator {
  transform: rotate(45deg);
  background: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}

.panel-body {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-text-dim);
}

.metric {
  display: inline-flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--color-border);
  background: var(--color-primary-alt);
}

.metric-value {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--color-accent);
  line-height: 1;
}

.metric-label {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  letter-spacing: 0.06em;
}

.step-list {
  display: grid;
  gap: 1rem;
}

.step-item {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--color-border);
  background: var(--color-primary-alt);
}

.step-index {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-accent);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.125rem;
  line-height: 1;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-primary-alt);
  border: 1px solid var(--color-border);
  transition: border-color var(--duration) var(--easing), color var(--duration) var(--easing);
}

.tag:hover {
  border-color: var(--color-neon-blue);
  color: var(--color-neon-blue);
}

.image-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--color-primary-alt);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.image-frame::before {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(22, 33, 62, 0.8) 0%, rgba(26, 26, 46, 0.92) 100%), repeating-linear-gradient(135deg, transparent 0, transparent 12px, rgba(0, 210, 255, 0.06) 12px, rgba(0, 210, 255, 0.06) 13px);
  color: var(--color-text-dim);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
}

.image-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration) var(--easing);
}

.image-frame:hover img {
  transform: scale(1.02);
}

.image-frame--wide {
  aspect-ratio: 16 / 6;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame-caption {
  position: absolute;
  z-index: 2;
  left: 0;
  bottom: 0;
  padding: 0.375rem 0.875rem;
  background: rgba(26, 26, 46, 0.85);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  border-left: 2px solid var(--color-accent);
}

.scale {
  display: block;
  width: 100%;
  height: 12px;
  background: repeating-linear-gradient(90deg, var(--color-neon-blue) 0, var(--color-neon-blue) 1px, transparent 1px, transparent 12px);
  opacity: 0.3;
}

@media (max-width: 960px) {
  .footer-mast {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .grid-asym {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .header-main {
    flex-wrap: wrap;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
  }

  .header-main {
    flex-wrap: wrap;
    align-items: center;
    padding: 1rem var(--container-padding) 1rem;
  }

  .site-nav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    border-top: 1px solid var(--color-border);
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    gap: 0;
  }

  .site-nav[data-open] {
    display: flex;
  }

  .site-nav a {
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav a[aria-current="page"] {
    background: var(--color-primary-alt);
    padding-left: 1rem;
    border-left: 3px solid var(--color-accent);
  }

  .footer-mast {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header::before {
    width: 2.5rem;
    height: 2.5rem;
  }
}

@media (max-width: 640px) {
  .site-topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.125rem;
  }

  .header-main {
    gap: 0.75rem;
  }

  .header-main::before {
    width: 64px;
  }

  .brand-mark {
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.125rem;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-sub {
    font-size: 0.5625rem;
    letter-spacing: 0.2em;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .image-frame:hover img {
    transform: none;
  }
}