:root {
  --color-primary: #0B1D3A;
  --color-accent: #FF6A00;
  --color-paper: #F7F3E8;
  --color-ink: #1A1A1A;
  --color-slate: #3A5A8C;
  --color-white: #FFFFFF;
  --color-cyan: #00D4C8;
  --color-accent-dark: #D35400;
  --color-mist: #E5E0D4;
  --font-heading: "Noto Sans SC", "Impact", "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Roboto", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --container-max: 1280px;
  --radius-pill: 999px;
  --radius-card: 4px;
  --shadow-float: 0 12px 36px rgba(11, 29, 58, 0.18);
  --shadow-float-sm: 0 4px 16px rgba(11, 29, 58, 0.1);
  --transition-base: 0.25s ease;
  --header-top: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  background: var(--color-paper);
  color: var(--color-ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
}

button {
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.18;
  color: var(--color-primary);
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 900;
}

h2 {
  font-size: clamp(1.55rem, 3.4vw, 2.4rem);
  font-weight: 800;
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 700;
}

p {
  margin-bottom: 1em;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 28px;
}

#main-content {
  display: block;
  scroll-margin-top: 96px;
}

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

.mono {
  font-family: var(--font-mono);
}

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

a:focus-visible,
button:focus-visible {
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 20px;
  z-index: 1000;
  display: inline-block;
  padding: 12px 22px;
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 800;
  border-radius: 6px;
  transition: top 0.25s ease;
}

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

.skip-link:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: -3px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-white);
  background: var(--color-slate);
  transition: background 0.25s ease, transform 0.25s ease, color 0.25s ease;
}

.btn:hover {
  background: var(--color-primary);
  transform: translateY(-1px);
}

.btn-accent {
  padding: 13px 24px;
  color: var(--color-primary);
  background: var(--color-accent);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

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

.btn-accent:focus-visible {
  outline-color: var(--color-accent-dark);
  outline-offset: -3px;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

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

.btn-lg {
  padding: 16px 30px;
  font-size: 1.02rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  padding: var(--header-top) 0 10px;
}

.header-wrap {
  position: relative;
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 10px 16px;
  background: var(--color-primary);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-float);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-right: auto;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 12px;
  background: var(--color-accent);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1.1;
  color: var(--color-white);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  line-height: 1;
  text-transform: uppercase;
  color: var(--color-cyan);
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  counter-reset: nav-counter;
}

.nav-item {
  counter-increment: nav-counter;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link::before {
  content: counter(nav-counter, decimal-leading-zero);
  display: inline-block;
  margin-right: 5px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 400;
  vertical-align: 2px;
  color: var(--color-cyan);
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.07);
}

.nav-link:hover::before {
  color: var(--color-accent);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.08);
}

.nav-link[aria-current="page"]::before {
  color: var(--color-accent);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  transition: background 0.2s ease;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.14);
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-white);
  transition: transform 0.25s ease, opacity 0.25s 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);
}

.cta-text {
  display: inline-block;
}

.cta-arrow {
  display: inline-block;
  font-family: var(--font-mono);
  transition: transform 0.25s ease;
}

.btn-accent:hover .cta-arrow {
  transform: translateX(4px);
}

.header-cta {
  flex-shrink: 0;
}

.site-footer {
  position: relative;
  z-index: 0;
  margin-top: 80px;
  overflow: hidden;
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
}

.site-footer::before {
  content: "K1";
  position: absolute;
  right: -30px;
  bottom: -70px;
  z-index: 0;
  font-family: var(--font-heading);
  font-size: clamp(160px, 22vw, 340px);
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  color: rgba(255, 255, 255, 0.04);
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.06);
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-accent) 0 120px, var(--color-cyan) 120px 160px, transparent 160px);
}

.site-footer .container {
  position: relative;
  z-index: 1;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 1.2fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  padding: 72px 0 44px;
}

.footer-brand-block {
  max-width: 30rem;
}

.brand-footer {
  margin-right: 0;
}

.footer-tagline {
  margin: 20px 0 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.footer-trust {
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.58);
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-content: start;
}

.footer-links-col {
  min-width: 0;
}

.footer-links-title {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-cyan);
}

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

.footer-link {
  position: relative;
  display: inline-block;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 1px;
  background: var(--color-accent);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.footer-link:hover {
  padding-left: 16px;
  color: var(--color-accent);
}

.footer-link:hover::before {
  opacity: 1;
}

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

.footer-contact-list {
  display: grid;
  gap: 12px;
}

.footer-contact-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact-label {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.footer-contact-value {
  min-width: 0;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 22px 0 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: rgba(255, 255, 255, 0.48);
}

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

.back-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 300;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--color-white);
  background: var(--color-primary);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--color-primary);
  background: var(--color-accent);
}

.page-hero {
  padding: clamp(48px, 8vh, 88px) 0 clamp(32px, 5vh, 56px);
}

.hero-block {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}

.hero-block > * {
  min-width: 0;
}

.hero-overline {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.hero-overline::before {
  content: "// ";
  color: var(--color-cyan);
}

.hero-title {
  margin-bottom: 18px;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.08;
  color: var(--color-primary);
}

.hero-desc {
  max-width: 36rem;
  margin-bottom: 28px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-slate);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-stage {
  position: relative;
  min-height: 280px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 106, 0, 0.18) 0%, transparent 46%),
    var(--color-primary);
}

.hero-stage::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 160px;
  height: 160px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  opacity: 0.9;
}

.section-block {
  padding: clamp(48px, 8vh, 80px) 0;
}

.section-label {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-label::before {
  content: "// ";
  color: var(--color-cyan);
}

.section-title {
  max-width: 24em;
}

.section-intro {
  max-width: 42rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-slate);
}

.breadcrumbs {
  padding: 24px 0 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item {
  color: var(--color-slate);
}

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

.breadcrumb-link {
  color: var(--color-primary);
}

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

.breadcrumb-current {
  font-weight: 500;
  color: var(--color-ink);
}

.content-area {
  max-width: 46rem;
  margin-inline: auto;
}

.content-prose {
  max-width: 46rem;
  margin-inline: auto;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--color-ink);
}

.content-prose p {
  margin-bottom: 1.2em;
}

.content-prose h2,
.content-prose h3 {
  margin-top: 1.8em;
  margin-bottom: 0.7em;
}

.content-prose ul {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
  list-style: disc;
}

.content-prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
  list-style: decimal;
}

.content-prose li {
  margin-bottom: 0.4em;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 28px);
}

.grid-12 > * {
  min-width: 0;
}

.grid-span-4 {
  grid-column: span 4;
}

.grid-span-6 {
  grid-column: span 6;
}

.grid-span-8 {
  grid-column: span 8;
}

.info-card {
  background: var(--color-white);
  border: 1px solid var(--color-mist);
  padding: clamp(20px, 3vw, 36px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.info-card:hover {
  border-color: var(--color-slate);
  box-shadow: var(--shadow-float-sm);
  transform: translateY(-2px);
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--color-slate);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

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

.divider {
  margin: 44px 0;
  border: 0;
  border-top: 1px solid var(--color-mist);
}

.img-frame {
  position: relative;
  min-height: 200px;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.07) 0%, transparent 38%),
    var(--color-primary);
}

.img-frame-16-9 {
  min-height: 0;
  aspect-ratio: 16 / 9;
}

.img-frame-4-3 {
  min-height: 0;
  aspect-ratio: 4 / 3;
}

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

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 769px) {
  .site-nav {
    margin-left: auto;
  }
}

@media (min-width: 1025px) {
  .site-nav {
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: 0;
    transform: translate(-50%, -50%);
  }
}

@media (max-width: 1024px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand-block {
    grid-column: 1 / -1;
    max-width: none;
  }

  .grid-span-4 {
    grid-column: span 6;
  }

  .grid-span-8 {
    grid-column: span 12;
  }
}

@media (max-width: 768px) {
  .container {
    padding-inline: 16px;
  }

  .site-header {
    padding: 10px 0 8px;
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 22px;
  }

  .brand-mark {
    min-width: 38px;
    height: 38px;
    padding: 0 10px;
    font-size: 1.02rem;
  }

  .brand-name {
    font-size: 1.08rem;
  }

  .brand-sub {
    display: none;
  }

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

  .site-nav {
    display: none;
    flex-basis: 100%;
    order: 3;
    padding: 6px 2px 2px;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
  }

  .header-cta {
    display: none;
    order: 4;
    width: 100%;
    margin-top: 6px;
    justify-content: center;
  }

  .site-nav[data-open="true"] + .header-cta {
    display: inline-flex;
  }

  .hero-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-stage {
    min-height: 200px;
  }

  .grid-12 {
    grid-template-columns: 1fr;
  }

  .grid-span-4,
  .grid-span-6,
  .grid-span-8 {
    grid-column: span 1;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 52px 0 36px;
  }

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

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

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

@media (max-width: 479px) {
  .footer-links {
    grid-template-columns: 1fr;
  }

  .footer-contact-item {
    grid-template-columns: 38px 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .back-to-top {
    transition: none;
  }
}