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

:root {
  --color-space: #0A1128;
  --color-navy: #101B3D;
  --color-orange: #FF6B2C;
  --color-green: #39FF88;
  --color-ink: #060A18;
  --color-mist: #F4F6FC;
  --color-ash: #B8C4E0;
  --color-cyan: #22D3EE;
  --border-main: rgba(184, 196, 224, 0.18);
  --border-hot: rgba(34, 211, 238, 0.38);
  --font-head: "Noto Sans SC", system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "HarmonyOS Sans SC", "Source Han Sans SC", system-ui, "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", monospace;
  --width-max: 1280px;
  --radius: 12px;
  --shadow: 0 12px 28px rgba(2, 6, 20, 0.35);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-space);
  color: var(--color-mist);
  font: 400 16px/1.75 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-mist);
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

p {
  margin: 0;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
}

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

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

#main-content {
  display: block;
  min-height: 62vh;
  scroll-margin-top: 7rem;
}

#main-content:focus {
  outline: none;
}

#main-content:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 4px;
}

.container {
  width: min(calc(100% - clamp(1rem, 5vw, 3.5rem)), var(--width-max));
  margin-inline: auto;
}

.content-shell {
  width: min(calc(100% - clamp(1rem, 5vw, 3.5rem)), var(--width-max));
  margin-inline: auto;
  padding-block: 3.5rem;
}

.main-content {
  min-height: 62vh;
}

.prose {
  max-width: 72ch;
  color: var(--color-ash);
}

.prose p + p {
  margin-top: 1em;
}

.prose a {
  color: var(--color-cyan);
  text-decoration: underline;
  text-decoration-color: rgba(34, 211, 238, 0.4);
  text-underline-offset: 0.2em;
  transition: color 0.2s var(--ease), text-decoration-color 0.2s var(--ease);
}

.prose a:hover {
  color: var(--color-green);
  text-decoration-color: var(--color-green);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-title {
  margin: 0;
}

.section-note {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-ash);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cards {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
}

.card {
  background: linear-gradient(145deg, rgba(16, 27, 61, 0.9), rgba(10, 17, 40, 0.94));
  border: 1px solid var(--border-main);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hot);
  box-shadow: 0 18px 36px rgba(2, 6, 20, 0.4);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  background: transparent;
  color: var(--color-mist);
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

.btn-primary:hover {
  background: #ff7d4a;
  color: var(--color-ink);
  transform: translateY(-2px);
}

.btn-ghost {
  border-color: var(--border-hot);
  color: var(--color-cyan);
}

.btn-ghost:hover {
  background: rgba(34, 211, 238, 0.08);
  border-color: var(--color-green);
  color: var(--color-green);
  transform: translateY(-2px);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--border-main);
  border-radius: 999px;
  background: rgba(16, 27, 61, 0.55);
  color: var(--color-ash);
  font-size: 0.76rem;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.tag[data-accent="orange"] {
  color: var(--color-orange);
  border-color: rgba(255, 107, 44, 0.45);
}

.tag[data-accent="green"] {
  color: var(--color-green);
  border-color: rgba(57, 255, 136, 0.4);
}

.tag[data-accent="cyan"] {
  color: var(--color-cyan);
  border-color: rgba(34, 211, 238, 0.4);
}

.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-main);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(57, 255, 136, 0.08), rgba(34, 211, 238, 0.05) 35%, var(--color-navy));
  box-shadow: var(--shadow);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 17, 40, 0.25), transparent 60%);
  pointer-events: none;
}

.media-frame[data-ratio="16/9"] {
  aspect-ratio: 16 / 9;
}

.media-frame[data-ratio="4/3"] {
  aspect-ratio: 4 / 3;
}

.media-frame[data-ratio="1/1"] {
  aspect-ratio: 1 / 1;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-caption {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--color-ash);
  text-align: right;
}

.caption {
  font-size: 0.78rem;
  color: var(--color-ash);
  line-height: 1.6;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-orange);
  line-height: 1;
  letter-spacing: -0.01em;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-ash);
  letter-spacing: 0.08em;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border-main);
  border-radius: 999px;
  background: var(--color-navy);
  color: var(--color-ash);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

.status-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 8px rgba(57, 255, 136, 0.6);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.6rem;
  margin-bottom: 1.5rem;
  font-size: 0.8rem;
  color: var(--color-ash);
  list-style: none;
  padding: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.breadcrumb li + li::before {
  content: "/";
  color: rgba(184, 196, 224, 0.4);
}

.breadcrumb a {
  color: var(--color-ash);
  transition: color 0.2s var(--ease);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-mist);
}

.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 3000;
  padding: 0.65rem 1rem;
  background: var(--color-orange);
  color: var(--color-ink);
  font-weight: 700;
  border-radius: 0 0 8px 8px;
  box-shadow: var(--shadow);
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-green);
  outline-offset: -2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 17, 40, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-main);
  box-shadow: 0 8px 24px rgba(2, 6, 20, 0.28);
}

@supports not (backdrop-filter: blur(10px)) {
  .site-header {
    background: var(--color-space);
  }
}

.header-shell {
  width: min(calc(100% - clamp(1rem, 4vw, 2.5rem)), var(--width-max));
  margin-inline: auto;
  position: relative;
}

.header-upper {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 0.95rem 0 0.45rem;
}

.brand-lockup {
  display: flex;
  flex-direction: column;
}

.brand-link {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  gap: 0.1rem;
  padding-left: 0.85rem;
}

.brand-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 4px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--color-orange), var(--color-cyan));
}

.brand-word {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--color-mist);
}

.brand-line {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--color-cyan);
  opacity: 0.9;
}

.header-sync {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border-main);
  border-radius: 100px;
  background: rgba(16, 27, 61, 0.6);
  color: var(--color-ash);
  font-size: 0.78rem;
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 0 0 rgba(57, 255, 136, 0.4);
  animation: syncPulse 2s infinite;
}

.sync-text {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.header-nav-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  border-top: 1px solid var(--border-main);
  padding: 0.55rem 0;
  position: relative;
}

.header-nav-wrap::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 88px;
  height: 3px;
  background: var(--color-orange);
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}

.site-nav {
  flex: 1 1 auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-ash);
  letter-spacing: 0.03em;
  border: 1px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.nav-link:hover {
  color: var(--color-mist);
  background: rgba(184, 196, 224, 0.08);
  border-color: var(--border-main);
}

.nav-link[aria-current="page"] {
  color: var(--color-mist);
  background: rgba(34, 211, 238, 0.1);
  border-color: var(--border-hot);
  box-shadow: inset 0 -2px 0 var(--color-orange);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  background: transparent;
  border: 1px solid var(--border-main);
  border-radius: 8px;
  padding: 0.45rem 0.8rem;
  color: var(--color-mist);
  cursor: pointer;
  line-height: 1;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--color-green);
  background: rgba(57, 255, 136, 0.06);
}

.nav-toggle-bars {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--color-orange);
  box-shadow: 0 -6px 0 var(--color-orange), 0 6px 0 var(--color-orange);
  border-radius: 2px;
}

.nav-toggle-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-mist);
}

.site-footer {
  margin-top: auto;
  background: var(--color-ink);
  color: var(--color-ash);
  border-top: 1px solid var(--border-main);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  background: linear-gradient(90deg, var(--color-orange) 0%, rgba(255, 107, 44, 0.25) 30%, transparent 50%, rgba(34, 211, 238, 0.5) 75%, var(--color-green) 100%);
  z-index: 1;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(184, 196, 224, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184, 196, 224, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.footer-shell {
  width: min(calc(100% - clamp(1rem, 4vw, 2.5rem)), var(--width-max));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 0.8fr 1.2fr;
  gap: 2.5rem;
  padding: 3.5rem 0 2rem;
}

.footer-brand {
  max-width: 40rem;
}

.footer-word {
  position: relative;
  padding-left: 1rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--color-mist);
  margin-bottom: 0.6rem;
}

.footer-word::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15rem;
  width: 0.45rem;
  height: 1.25rem;
  background: linear-gradient(180deg, var(--color-orange), var(--color-cyan));
  border-radius: 2px;
}

.footer-about {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-ash);
  max-width: 34rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

.footer-col-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--color-cyan);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-link {
  width: fit-content;
  color: var(--color-ash);
  position: relative;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--color-mist);
  padding-left: 0.4rem;
}

.footer-contact-item {
  font-size: 0.9rem;
  color: var(--color-ash);
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid var(--border-main);
  padding: 1.6rem 0 1.8rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 2rem;
  justify-content: space-between;
}

.footer-trust {
  flex-basis: 100%;
  font-size: 0.82rem;
  color: var(--color-ash);
  line-height: 1.7;
  opacity: 0.86;
}

.footer-legal {
  font-size: 0.82rem;
  color: var(--color-mist);
  font-family: var(--font-mono);
}

.footer-support {
  font-size: 0.82rem;
  color: var(--color-cyan);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

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

@keyframes syncPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(57, 255, 136, 0.4);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(57, 255, 136, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 136, 0);
  }
}

@keyframes navFade {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 900px) {
  .header-upper {
    padding-top: 0.75rem;
  }

  .header-sync {
    width: 100%;
    justify-content: flex-start;
  }

  .header-nav-wrap {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.65rem 0;
  }

  .site-nav {
    display: none;
    width: 100%;
    padding-top: 0.25rem;
  }

  .site-nav[data-open] {
    display: block;
    animation: navFade 0.25s var(--ease);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 0.8rem 0.35rem;
    border-bottom: 1px solid var(--border-main);
    border-radius: 0;
    border-left: 2px solid transparent;
  }

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

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }
}

@media (max-width: 760px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1.2rem 0 1.6rem;
  }

  .content-shell {
    padding-block: 2.5rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }

  .site-nav[data-open] {
    animation: none;
  }

  .sync-dot {
    animation: none;
  }

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

  .card:hover,
  .btn:hover,
  .btn-primary:hover,
  .btn-ghost:hover {
    transform: none;
  }
}