:root {
  --header-h: 76px;
  --container: 1380px;
  --bg-deep: #0B1F3F;
  --bg-blue: #1E3A5F;
  --paper: #F5E6C8;
  --paper-dim: rgba(245, 230, 200, 0.78);
  --accent: #FF4B2B;
  --ink: #1A1A1A;
  --white: #FFFFFF;
  --muted: #8A9AA5;
  --gold: #E0B45A;
  --shadow-header: 0 12px 28px rgba(0, 0, 0, 0.28);
  --shadow-panel: 0 20px 40px rgba(4, 10, 25, 0.28);
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

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

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

body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--bg-deep);
  background-image:
    linear-gradient(145deg, rgba(30, 58, 95, 0.55) 0%, rgba(11, 31, 63, 0.98) 58%),
    radial-gradient(circle at 85% 12%, rgba(224, 180, 90, 0.16), transparent 34%),
    radial-gradient(circle at 8% 82%, rgba(255, 75, 43, 0.1), transparent 38%);
  background-attachment: fixed;
  background-repeat: no-repeat;
}

address,
em {
  font-style: normal;
}

a {
  color: inherit;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

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

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

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  left: 8px;
  top: 8px;
  z-index: 1200;
  transform: translateY(-160%);
  padding: 10px 16px;
  background: var(--accent);
  color: var(--white);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--white);
  outline: 3px solid var(--gold);
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin-inline: auto;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-h) + 8px);
}

.section {
  padding: 64px 0;
}

.section-head {
  max-width: 780px;
  margin-bottom: 40px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-intro {
  max-width: 56em;
  margin-top: 24px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin-bottom: 28px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

.breadcrumb a {
  color: rgba(245, 230, 200, 0.8);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

.grid {
  display: grid;
  gap: 24px;
}

.grid-cols-1 {
  grid-template-columns: minmax(0, 1fr);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.panel {
  background: var(--paper);
  color: var(--ink);
  border-top: 4px solid var(--accent);
  box-shadow: var(--shadow-panel);
}

.panel-pad {
  padding: clamp(24px, 4vw, 40px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

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

.btn-primary:hover {
  background: #de3d1e;
  border-color: #de3d1e;
  color: var(--white);
}

.btn-paper {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
}

.btn-paper:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
}

.btn-outline {
  background: transparent;
  border-color: rgba(245, 230, 200, 0.6);
  color: var(--paper);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tag--accent {
  border-color: var(--accent);
  color: var(--accent);
}

.prose {
  font-size: 16px;
  line-height: 1.85;
}

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

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--ink);
  line-height: 1.2;
}

.prose h2 {
  font-size: 26px;
  margin-top: 1.6em;
  border-left: 4px solid var(--accent);
  padding-left: 14px;
}

.prose h3 {
  font-size: 20px;
  margin-top: 1.4em;
}

.prose ul,
.prose ol {
  padding-left: 1.2em;
}

.prose li + li {
  margin-top: 0.5em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 800;
  background: rgba(11, 31, 63, 0.88);
  border-bottom: 1px solid rgba(224, 180, 90, 0.5);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(11, 31, 63, 0.98);
  box-shadow: var(--shadow-header);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  z-index: 2;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  pointer-events: none;
}

.header-inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 24px;
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 38px;
  border: 2px solid var(--gold);
  border-top: 0;
}

.brand-mark::before {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  top: -2px;
  height: 6px;
  background: linear-gradient(90deg, var(--accent) 0 65%, var(--gold) 65% 100%);
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  bottom: 7px;
  border-bottom: 1px solid rgba(224, 180, 90, 0.65);
}

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1;
}

.brand-text b {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.brand-text small {
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.site-nav {
  display: flex;
  align-items: stretch;
}

.nav-list {
  display: flex;
  align-items: stretch;
  list-style: none;
}

.nav-list li {
  display: flex;
  align-items: stretch;
}

.nav-list li + li {
  border-left: 1px solid rgba(245, 230, 200, 0.12);
}

.nav-list a {
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-top: 3px solid transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.nav-list a:hover {
  color: var(--accent);
  border-top-color: var(--accent);
  background: rgba(255, 75, 43, 0.08);
}

.nav-list a[aria-current="page"] {
  color: var(--accent);
  border-top-color: var(--accent);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  align-self: center;
  flex: 0 0 auto;
  padding: 10px 18px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 1px solid var(--paper);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.header-cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

.nav-toggle {
  display: none;
  align-items: center;
  align-self: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(245, 230, 200, 0.4);
  color: var(--paper);
  cursor: pointer;
}

.nav-toggle-label {
  font-size: 14px;
  font-weight: 700;
}

.nav-toggle-icon {
  position: relative;
  width: 16px;
  height: 12px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}

.nav-toggle-icon::before {
  top: 0;
}

.nav-toggle-icon::after {
  top: auto;
  bottom: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before,
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 5px;
}

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

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

.site-footer {
  position: relative;
  background: linear-gradient(180deg, rgba(11, 31, 63, 1) 0%, rgba(8, 18, 32, 1) 100%);
  color: var(--paper);
  border-top: 1px solid var(--gold);
}

.footer-main {
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.4fr 0.9fr;
  gap: clamp(32px, 6vw, 72px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.footer-domain {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer-trust {
  margin-top: 14px;
  max-width: 30em;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(245, 230, 200, 0.65);
}

.footer-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--paper);
  text-transform: uppercase;
}

.footer-contact-list {
  display: grid;
  gap: 6px;
  margin: 12px 0 0;
  font-family: var(--font-sans);
}

.contact-item {
  display: block;
  font-size: 14px;
  color: rgba(245, 230, 200, 0.78);
}

.footer-download {
  margin-top: 16px;
  max-width: 42em;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 230, 200, 0.6);
}

.footer-service-item {
  margin-top: 8px;
  font-size: 14px;
  color: rgba(245, 230, 200, 0.78);
}

.footer-service-item:first-child {
  font-family: var(--font-mono);
}

.footer-bottom {
  border-top: 1px solid rgba(224, 180, 90, 0.25);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 32px;
  padding: 18px 0;
}

.copyright {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(245, 230, 200, 0.8);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  list-style: none;
}

.legal-links a {
  color: rgba(245, 230, 200, 0.78);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(245, 230, 200, 0.7);
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-blue), var(--bg-deep));
  border: 1px solid rgba(224, 180, 90, 0.45);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(224, 180, 90, 0.35);
  pointer-events: none;
}

.media-frame[data-label]::before {
  content: attr(data-label);
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 1;
  padding: 6px 10px;
  background: var(--accent);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

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

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

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

@media (max-width: 960px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    height: var(--header-h);
  }

  .header-cta {
    display: none;
  }

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

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: linear-gradient(180deg, rgba(11, 31, 63, 0.99), rgba(8, 18, 32, 0.98));
    border-bottom: 1px solid var(--gold);
    box-shadow: var(--shadow-header);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

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

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

  .nav-list li {
    border-left: none;
  }

  .nav-list li + li {
    border-left: none;
    border-top: 1px solid rgba(245, 230, 200, 0.08);
  }

  .nav-list a {
    min-height: 50px;
    padding: 14px 24px;
    border-top: none;
    border-left: 3px solid transparent;
    white-space: normal;
  }

  .nav-list a:hover,
  .nav-list a[aria-current="page"] {
    border-top-color: transparent;
    border-left-color: var(--accent);
    color: var(--accent);
    background: rgba(255, 75, 43, 0.06);
  }

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

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .section {
    padding: 40px 0;
  }

  .page-title {
    font-size: clamp(36px, 13vw, 48px);
  }

  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-main {
    padding: 40px 0 24px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .legal-links {
    justify-content: center;
    gap: 16px;
  }
}

@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;
  }
}