:root {
  --color-navy: #0A1E3C;
  --color-red: #E63946;
  --color-green: #39FF14;
  --color-bg: #F7F9FC;
  --color-white: #FFFFFF;
  --color-ink: #2D3748;
  --color-muted: #718096;
  --color-blue: #00BFFF;
  --color-violet: #805AD5;
  --font-head: Impact, 'Arial Black', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', monospace;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-pill: 999px;
  --shadow-card: 0 10px 30px rgba(10, 30, 60, 0.08);
}

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

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

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  padding-top: 128px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 85% 8%, rgba(0, 191, 255, 0.10), transparent 24%),
    radial-gradient(circle at 12% 30%, rgba(128, 90, 213, 0.08), transparent 26%),
    linear-gradient(rgba(10, 30, 60, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 30, 60, 0.025) 1px, transparent 1px);
  background-size: auto, auto, 64px 64px, 64px 64px;
}

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

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

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

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

a {
  color: var(--color-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button {
  font: inherit;
  cursor: pointer;
}

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

:focus:not(:focus-visible) {
  outline: none;
}

#main-content {
  min-height: 60vh;
  scroll-margin-top: 120px;
}

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

.visually-hidden:not(:focus):not(:active) {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
  clip-path: inset(50%);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 3000;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background: var(--color-red);
  color: var(--color-white);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(10, 30, 60, 0.30);
  transform: translateY(calc(-100% - 28px));
  transition: transform 0.2s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  z-index: 3001;
  pointer-events: none;
}

.scroll-progress::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 100%;
  background: linear-gradient(90deg, var(--color-red), var(--color-green), var(--color-blue));
  transform-origin: 0 50%;
  transform: scaleX(var(--progress, 0));
}

.site-header {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: min(1180px, calc(100% - 28px));
  z-index: 1200;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 8px;
  bottom: -10px;
  width: 120px;
  height: 8px;
  border-radius: 0 0 6px 6px;
  background: repeating-linear-gradient(135deg, var(--color-red) 0 8px, transparent 8px 16px);
  opacity: 0.55;
  pointer-events: none;
}

.header-capsule {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 72px;
  padding: 10px 12px 10px 18px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, rgba(10, 30, 60, 0.92), rgba(10, 30, 60, 0.84));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 16px 40px rgba(10, 30, 60, 0.24);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--color-red), #ff5a60);
  color: var(--color-white);
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 900;
  line-height: 1;
  transform: skewX(-4deg);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25), 0 6px 16px rgba(230, 57, 70, 0.35);
}

.brand-text,
.footer-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--color-white);
}

.brand-sub {
  margin-top: 2px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-blue);
  text-transform: uppercase;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.76);
  text-decoration: none;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.10);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
  background: rgba(0, 191, 255, 0.16);
  box-shadow: inset 0 0 0 1px rgba(0, 191, 255, 0.35);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-left: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.08);
  transition: background 0.2s;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.16);
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-white);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle-line + .nav-toggle-line {
  margin-top: 5px;
}

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-footer {
  position: relative;
  margin-top: 96px;
  overflow: hidden;
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.80);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(230, 57, 70, 0.16), transparent 38%),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.015) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -80px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background:
    repeating-linear-gradient(45deg, rgba(57, 255, 20, 0.08) 0 8px, transparent 8px 18px),
    repeating-linear-gradient(-45deg, rgba(0, 191, 255, 0.10) 0 6px, transparent 6px 16px);
  pointer-events: none;
}

.footer-container {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 24px 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  align-items: start;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark--footer {
  background: linear-gradient(145deg, rgba(0, 191, 255, 0.18), rgba(128, 90, 213, 0.22));
  color: var(--color-green);
  box-shadow: inset 0 0 0 1px rgba(0, 191, 255, 0.30);
}

.footer-trust {
  max-width: 540px;
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.70);
}

.footer-contact {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 2px solid var(--color-green);
  border-radius: 0 12px 12px 0;
  background: rgba(57, 255, 20, 0.05);
}

.footer-label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-blue);
}

.footer-value {
  margin: 2px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.86);
}

.footer-note {
  margin-top: 16px;
  padding-left: 14px;
  border-left: 2px solid rgba(57, 255, 20, 0.60);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.58);
}

.footer-index {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-top: 4px;
}

.footer-nav-heading {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--color-white);
}

.footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  width: 100%;
}

.footer-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-nav a::before {
  content: "";
  position: absolute;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 6px rgba(57, 255, 20, 0.80);
  opacity: 0.80;
  transition: background 0.2s;
}

.footer-nav a:hover {
  color: var(--color-white);
  padding-left: 20px;
}

.footer-nav a:hover::before {
  background: var(--color-blue);
}

.footer-bottom {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
  align-items: center;
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.60);
}

.footer-copy,
.footer-icp {
  margin: 0;
}

.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.container {
  width: min(1180px, 100% - 32px);
  margin-inline: auto;
}

.section {
  padding: clamp(48px, 7vw, 96px) 0;
  position: relative;
}

.section--tight {
  padding: clamp(32px, 4vw, 56px) 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 28px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-red);
}

.section-kicker::before {
  content: "";
  width: 28px;
  height: 3px;
  background: var(--color-green);
}

.section-title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  color: var(--color-navy);
}

.lead {
  margin-top: 14px;
  max-width: 640px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-hero {
  position: relative;
  padding: clamp(48px, 7vw, 88px) 0 40px;
}

.page-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-red);
  text-transform: uppercase;
}

.page-hero-kicker::before {
  content: "";
  width: 36px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-red), var(--color-blue));
}

.page-hero-title {
  max-width: 14em;
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(44px, 8vw, 96px);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--color-navy);
}

.hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: end;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--color-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-blue);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--color-blue);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-violet);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-muted);
  font-weight: 600;
}

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

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

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

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

.card {
  position: relative;
  background: var(--color-white);
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.card--hover {
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.card--hover:hover {
  transform: translateY(-5px);
  border-color: var(--color-blue);
  box-shadow: 0 20px 44px rgba(10, 30, 60, 0.14);
}

.card--stack {
  border-top: 4px solid var(--color-red);
}

.card--blue {
  border-top: 4px solid var(--color-blue);
}

.card--violet {
  border-top: 4px solid var(--color-violet);
}

.card__body {
  padding: 24px;
}

.card__body > p {
  margin: 0 0 12px;
  line-height: 1.7;
  color: var(--color-muted);
}

.card__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.2;
  color: var(--color-navy);
}

.card__meta {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
}

.card-stack {
  display: grid;
  gap: 20px;
}

.card-stack .card + .card {
  margin-top: -12px;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(0, 191, 255, 0.08);
  border: 1px solid rgba(0, 191, 255, 0.22);
  color: var(--color-navy);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.tag--red {
  background: rgba(230, 57, 70, 0.08);
  border-color: rgba(230, 57, 70, 0.24);
}

.tag--green {
  background: rgba(57, 255, 20, 0.08);
  border-color: rgba(57, 255, 20, 0.35);
  color: #176B00;
}

.tag--violet {
  background: rgba(128, 90, 213, 0.08);
  border-color: rgba(128, 90, 213, 0.25);
}

a.tag:hover {
  border-color: var(--color-violet);
  color: var(--color-violet);
}

.data-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 8px;
  background: var(--color-navy);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--color-green);
  box-shadow: inset 0 0 0 1px rgba(57, 255, 20, 0.20);
}

.data-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.90);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  color: var(--color-white);
  background: transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s, border-color 0.2s;
}

.btn--primary {
  background: var(--color-red);
  box-shadow: 0 10px 28px rgba(230, 57, 70, 0.28);
}

.btn--primary:hover {
  background: #d22f3b;
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(230, 57, 70, 0.30);
}

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

.btn--ghost:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
  transform: translateY(-2px);
}

.btn--data {
  background: var(--color-navy);
  color: var(--color-green);
  font-family: var(--font-mono);
  box-shadow: 0 10px 24px rgba(10, 30, 60, 0.18);
}

.btn--data:hover {
  background: #123363;
  transform: translateY(-2px);
}

.glass {
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 40px rgba(10, 30, 60, 0.10);
}

.prose {
  max-width: 780px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-ink);
}

.prose p {
  margin: 0 0 1em;
}

.prose h2,
.prose h3 {
  margin: 1.6em 0 0.6em;
  font-family: var(--font-head);
  line-height: 1.2;
  color: var(--color-navy);
}

.prose ul,
.prose ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
}

.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: linear-gradient(135deg, #0A1E3C 0%, #123A66 55%, #10318A 100%);
}

.media-frame::before {
  content: attr(data-label);
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  padding: 6px 12px;
  border-radius: 6px;
  background: rgba(230, 57, 70, 0.90);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.media-frame::after {
  content: "";
  position: absolute;
  right: -28px;
  top: -28px;
  width: 120px;
  height: 120px;
  border: 18px solid rgba(0, 191, 255, 0.18);
  border-radius: 50%;
}

@media (max-width: 960px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  body {
    padding-top: 96px;
  }

  .site-header {
    top: 12px;
    width: calc(100% - 24px);
  }

  .header-capsule {
    min-height: 64px;
    padding: 8px 10px 8px 14px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-sub {
    font-size: 10px;
  }

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

  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 14px);
    left: 0;
    right: 0;
    z-index: 1200;
    padding: 14px;
    border-radius: var(--radius-lg);
    background: rgba(10, 30, 60, 0.97);
    border: 1px solid rgba(0, 191, 255, 0.25);
    box-shadow: 0 24px 60px rgba(10, 30, 60, 0.30);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
  }

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

  .nav-list {
    display: grid;
    gap: 6px;
  }

  .nav-link {
    display: flex;
    padding: 14px 16px;
    border-radius: 16px;
    font-size: 16px;
  }

  .hero-split {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 720px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 520px) {
  .brand-text {
    display: none;
  }

  .site-header::after {
    width: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .card--hover:hover,
  .btn:hover,
  .nav-link:hover {
    transform: none;
  }

  .scroll-progress {
    display: none;
  }
}