:root {
  --c-space: #0B1B2B;
  --c-space-light: #10222F;
  --c-green: #00C48C;
  --c-red: #FF3B4A;
  --c-light: #F2F6FA;
  --c-glass: rgba(255, 255, 255, 0.08);
  --c-cyan: #7DF9FF;
  --c-yellow: #FFB300;
  --c-ink: #001B2E;
  --c-text: #E6F0FA;
  --c-text-dim: rgba(230, 240, 250, 0.65);

  --font-head: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Consolas", monospace;

  --fs-hero: clamp(2.2rem, 4vw, 3.5rem);
  --fs-section: clamp(1.4rem, 2vw, 2rem);

  --container: 1320px;
  --gutter: 24px;
  --radius-pill: 999px;
  --transition: 250ms ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-space);
  background-image:
    radial-gradient(circle at 12% 20%, rgba(125, 249, 255, 0.06), transparent 30%),
    radial-gradient(circle at 85% 70%, rgba(0, 196, 140, 0.05), transparent 34%);
  background-attachment: fixed;
  padding-top: 96px;
}

main#main-content {
  outline: none;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-text);
}

h1 {
  font-size: var(--fs-hero);
}

h2 {
  font-size: var(--fs-section);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0;
}

a {
  color: var(--c-cyan);
}

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

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

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 2000;
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background: var(--c-green);
  color: var(--c-ink);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
  transition: top 200ms ease;
}

.skip-link:focus {
  top: 16px;
}

.read-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 10;
  background: linear-gradient(90deg, var(--c-green), var(--c-cyan) 50%, var(--c-red));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 20px 0;
  transition: padding 300ms ease;
}

.site-header[data-scrolled] {
  padding-top: 10px;
}

.site-header__shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1240px;
  margin-inline: auto;
  padding: 8px 10px 8px 20px;
  border-radius: var(--radius-pill);
  background: rgba(11, 27, 43, 0.62);
  border: 1px solid rgba(125, 249, 255, 0.14);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: background 300ms ease, box-shadow 300ms ease;
}

.site-header[data-scrolled] .site-header__shell {
  background: rgba(7, 20, 32, 0.82);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--c-text);
  text-decoration: none;
  white-space: nowrap;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: 6px 10px;
  background: var(--c-green);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  border-radius: 14px;
  box-shadow: 0 4px 16px rgba(0, 196, 140, 0.4);
}

.site-header__name {
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border-radius: var(--radius-pill);
  color: rgba(230, 240, 250, 0.82);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 200ms ease, color 200ms ease;
}

.site-nav__link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.site-nav__link[aria-current="page"] {
  background: rgba(125, 249, 255, 0.1);
  color: var(--c-cyan);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  opacity: 0.9;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-header__cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #00C48C 0%, #00E6A5 100%);
  color: var(--c-ink);
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(0, 196, 140, 0.3);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.site-header__cta::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-red);
  box-shadow: 0 0 0 0 rgba(255, 59, 74, 0.45);
  animation: live-pulse 1.8s ease-in-out infinite;
}

.site-header__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0, 196, 140, 0.4);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-pill);
  background: rgba(125, 249, 255, 0.1);
  border: 1px solid rgba(125, 249, 255, 0.16);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: var(--radius-pill);
  background: var(--c-cyan);
  transition: transform 250ms ease, opacity 250ms ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

.site-footer {
  position: relative;
  margin-top: 80px;
  background-color: #071420;
  background-image:
    linear-gradient(rgba(125, 249, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 249, 255, 0.028) 1px, transparent 1px);
  background-size: 36px 36px;
  color: var(--c-text);
  border-top: 1px solid rgba(125, 249, 255, 0.12);
}

.footer-ticker {
  height: 4px;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-cyan) 45%, var(--c-red) 100%);
}

.site-footer__inner {
  max-width: calc(var(--container) + 2 * var(--gutter));
  margin-inline: auto;
  padding: 48px var(--gutter) 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.4fr 1.8fr;
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(125, 249, 255, 0.12);
}

.footer-brand {
  display: grid;
  justify-items: start;
  gap: 14px;
  align-content: start;
}

.footer-brand .site-header__brand {
  font-size: 1.05rem;
}

.footer-brand__desc {
  max-width: 40ch;
  color: rgba(230, 240, 250, 0.65);
  font-size: 0.9rem;
}

.footer-nav {
  display: grid;
  align-content: start;
}

.footer-nav__title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.footer-nav__list {
  display: grid;
  gap: 10px;
}

.footer-nav__list a {
  color: rgba(230, 240, 250, 0.78);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color 200ms ease, padding-left 200ms ease;
}

.footer-nav__list a:hover {
  color: var(--c-green);
  padding-left: 4px;
}

.footer-contact {
  display: grid;
  align-content: start;
}

.footer-contact__list {
  display: grid;
  gap: 12px;
  font-size: 0.92rem;
  color: rgba(230, 240, 250, 0.78);
  word-break: break-word;
}

.footer-contact__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.footer-contact__list li::before {
  content: "·";
  font-family: var(--font-mono);
  color: var(--c-green);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 28px;
}

.footer-base__note {
  flex: 1 1 100%;
  font-size: 0.82rem;
  color: rgba(230, 240, 250, 0.45);
}

.footer-base__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-left: auto;
}

.footer-base__links a {
  color: rgba(230, 240, 250, 0.78);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 200ms ease;
}

.footer-base__links a:hover {
  color: var(--c-cyan);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(125, 249, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(230, 240, 250, 0.5);
}

.footer-icp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-cyan);
}

.footer-icp::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-green);
}

.tf-container {
  width: 100%;
  max-width: calc(var(--container) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.tf-section {
  padding-block: clamp(48px, 7vw, 96px);
}

.tf-section--alt {
  background: var(--c-light);
  color: var(--c-ink);
}

.tf-section--alt h1,
.tf-section--alt h2,
.tf-section--alt h3 {
  color: var(--c-ink);
}

.tf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease, background 200ms ease, border-color 200ms ease;
}

.tf-btn:hover {
  transform: translateY(-2px);
}

.tf-btn--primary {
  background: var(--c-green);
  color: var(--c-ink);
  box-shadow: 0 4px 20px rgba(0, 196, 140, 0.3);
}

.tf-btn--ghost {
  background: transparent;
  border-color: var(--c-green);
  color: var(--c-green);
}

.tf-btn--danger {
  background: var(--c-red);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(255, 59, 74, 0.3);
}

.tf-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
  color: rgba(230, 240, 250, 0.6);
}

.tf-breadcrumb li {
  display: flex;
  align-items: center;
}

.tf-breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  font-family: var(--font-mono);
  color: rgba(230, 240, 250, 0.4);
}

.tf-breadcrumb a {
  color: var(--c-cyan);
  text-decoration: none;
}

.tf-breadcrumb a:hover {
  text-decoration: underline;
}

.tf-media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(125, 249, 255, 0.1), rgba(0, 196, 140, 0.05)),
    var(--c-space-light);
  box-shadow: inset 0 0 0 1px rgba(125, 249, 255, 0.1);
}

.tf-media--16x9 {
  aspect-ratio: 16 / 9;
}

.tf-media--4x3 {
  aspect-ratio: 4 / 3;
}

.tf-media--square {
  aspect-ratio: 1 / 1;
}

.tf-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@keyframes live-pulse {
  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(255, 59, 74, 0.45);
  }
  50% {
    opacity: 0.6;
    box-shadow: 0 0 0 6px rgba(255, 59, 74, 0);
  }
}

@media (max-width: 1024px) {
  body {
    padding-top: 84px;
  }

  .site-header__shell {
    padding: 8px 12px 8px 16px;
  }

  .site-nav {
    display: block;
    flex: initial;
    position: absolute;
    top: calc(100% + 12px);
    left: 8px;
    right: 8px;
    z-index: 999;
    padding: 16px;
    border-radius: 24px;
    background: rgba(7, 20, 32, 0.95);
    border: 1px solid rgba(125, 249, 255, 0.14);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 250ms ease, transform 250ms ease, visibility 250ms ease;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .site-nav__link {
    padding: 12px 16px;
    border-radius: 16px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 640px) {
  body {
    padding-top: 76px;
  }

  .site-header {
    padding: 12px 12px 0;
  }

  .site-header__shell {
    gap: 8px;
    border-radius: 28px;
  }

  .site-header__name {
    font-size: 0.95rem;
  }

  .site-header__logo {
    min-width: 38px;
    font-size: 0.85rem;
    padding: 5px 8px;
  }

  .site-header__cta {
    padding: 8px 14px;
    font-size: 0.85rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-base__links {
    margin-left: 0;
  }

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

@media (max-width: 480px) {
  .site-header__cta {
    display: none;
  }
}

@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;
  }
}