:root {
  --k1-bg-deep: #0B1E3A;
  --k1-bg-mid: #122A4D;
  --k1-accent-data: #39FF88;
  --k1-accent-cta: #FF2E4C;
  --k1-text-primary: #E0EAF5;
  --k1-text-secondary: #7A8EA6;
  --k1-accent-label: #FFD166;
  --k1-accent-tech: #7A5CFF;
  --k1-gradient-bridge: #1A3A66;
  --k1-font-headline: 'Oswald', 'Arial Narrow', 'Helvetica Neue', 'Noto Sans SC', sans-serif;
  --k1-font-body: 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --k1-header-height: 64px;
  --k1-transition: 200ms cubic-bezier(0.22, 0.61, 0.36, 1);
  --k1-grid-color: rgba(224, 234, 245, 0.06);
  --k1-content-width: 1280px;
  --k1-radius-sm: 4px;
  --k1-radius-md: 8px;
  --k1-radius-lg: 16px;
}

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

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

body {
  font-family: var(--k1-font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--k1-text-primary);
  background-color: var(--k1-bg-deep);
  background-image:
    linear-gradient(to right, var(--k1-grid-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--k1-grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--k1-transition), border-color var(--k1-transition), background-color var(--k1-transition);
}

a:hover {
  color: var(--k1-accent-data);
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--k1-accent-data);
  outline-offset: 4px;
  border-radius: 2px;
}

#main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  outline: none;
}

.k1-container {
  width: min(100% - 48px, var(--k1-content-width));
  margin-inline: auto;
}

@media (max-width: 768px) {
  .k1-container {
    width: min(100% - 32px, var(--k1-content-width));
  }
}

.k1-skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 9999;
  padding: 10px 18px;
  background-color: var(--k1-accent-data);
  color: var(--k1-bg-deep) !important;
  font-weight: 700;
  font-size: 14px;
  border-radius: var(--k1-radius-sm);
  transform: translateY(-200%);
  transition: transform var(--k1-transition);
}

.k1-skip-link:focus-visible {
  transform: translateY(0);
}

/* ===== Header ===== */
.k1-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(11, 30, 58, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(224, 234, 245, 0.12);
}

.k1-header__top {
  background-color: rgba(122, 92, 255, 0.12);
  border-bottom: 1px solid rgba(224, 234, 245, 0.08);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--k1-text-secondary);
  display: none;
}

@media (min-width: 768px) {
  .k1-header__top {
    display: block;
  }
}

.k1-header__top-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-block: 6px;
}

.k1-header__main {
  border-bottom: 1px solid rgba(224, 234, 245, 0.1);
}

.k1-header__main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding-block: 10px;
}

@media (max-width: 768px) {
  .k1-header__main-inner {
    min-height: 56px;
    padding-block: 8px;
  }
}

.k1-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--k1-text-primary);
}

.k1-brand:hover {
  color: var(--k1-text-primary);
}

.k1-brand__mark {
  position: relative;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.k1-brand__mark-ring {
  position: absolute;
  width: 30px;
  height: 30px;
  border: 2px solid var(--k1-accent-data);
  border-radius: 50%;
}

.k1-brand__mark-ring::before {
  content: '';
  position: absolute;
  inset: 6px;
  border: 1px solid var(--k1-accent-cta);
  border-radius: 50%;
}

.k1-brand__mark-pin {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--k1-accent-label);
  box-shadow: 0 0 12px rgba(255, 209, 102, 0.8);
}

.k1-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.k1-brand__text strong {
  font-family: var(--k1-font-headline);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--k1-text-primary);
}

.k1-brand__text small {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--k1-accent-data);
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .k1-brand__text strong {
    font-size: 20px;
  }
  .k1-brand__text small {
    font-size: 10px;
  }
}

.k1-mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 6px;
  border: 1px solid rgba(224, 234, 245, 0.2);
  border-radius: var(--k1-radius-sm);
  background-color: rgba(18, 42, 77, 0.6);
  color: var(--k1-text-primary);
  transition: border-color var(--k1-transition), background-color var(--k1-transition);
}

.k1-mobile-toggle:hover {
  border-color: var(--k1-accent-data);
}

.k1-mobile-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--k1-text-primary);
  border-radius: 2px;
  transition: transform var(--k1-transition), opacity var(--k1-transition);
}

.k1-mobile-toggle[aria-expanded="true"] .k1-mobile-toggle__bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.k1-mobile-toggle[aria-expanded="true"] .k1-mobile-toggle__bar:nth-child(2) {
  opacity: 0;
}

.k1-mobile-toggle[aria-expanded="true"] .k1-mobile-toggle__bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

.k1-mobile-toggle__text {
  font-size: 10px;
  color: var(--k1-text-secondary);
  line-height: 1;
}

@media (max-width: 768px) {
  .k1-mobile-toggle {
    display: flex;
  }
}

.k1-header__nav {
  background-color: rgba(11, 30, 58, 0.96);
}

@media (max-width: 768px) {
  .k1-header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: rgba(11, 30, 58, 0.98);
    border-bottom: 1px solid rgba(224, 234, 245, 0.15);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  }
  .k1-header__nav[data-open="true"] {
    display: block;
  }
}

.k1-header__nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

@media (max-width: 768px) {
  .k1-header__nav-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 12px;
  }
}

.k1-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

@media (max-width: 768px) {
  .k1-nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
}

.k1-nav__item {
  position: relative;
}

@media (min-width: 769px) {
  .k1-nav__item::before {
    content: attr(data-index);
    position: absolute;
    top: -12px;
    left: 8px;
    font-size: 9px;
    color: var(--k1-accent-tech);
    opacity: 0.6;
    letter-spacing: 0.1em;
  }
}

.k1-nav__link {
  display: block;
  padding: 14px 18px;
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--k1-text-primary);
  border-bottom: 2px solid transparent;
  position: relative;
  white-space: nowrap;
}

@media (max-width: 768px) {
  .k1-nav__link {
    padding: 14px 12px;
    border-bottom: 1px solid rgba(224, 234, 245, 0.08);
    font-size: 16px;
  }
}

.k1-nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, var(--k1-accent-data), var(--k1-accent-tech));
  transition: transform var(--k1-transition);
}

.k1-nav__link:hover,
.k1-nav__link[aria-current="page"] {
  color: var(--k1-accent-data);
}

.k1-nav__link[aria-current="page"]::after,
.k1-nav__link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.k1-header__favorite {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid rgba(255, 209, 102, 0.5);
  border-radius: 999px;
  font-size: 14px;
  color: var(--k1-accent-label);
  transition: background-color var(--k1-transition), border-color var(--k1-transition);
}

.k1-header__favorite:hover {
  border-color: var(--k1-accent-label);
  background-color: rgba(255, 209, 102, 0.08);
}

.k1-header__favorite-star {
  font-size: 16px;
  color: var(--k1-accent-label);
}

@media (max-width: 768px) {
  .k1-header__favorite {
    display: none;
  }
}

/* ===== Footer ===== */
.k1-footer {
  background-color: var(--k1-bg-mid);
  border-top: 2px solid rgba(224, 234, 245, 0.1);
  margin-top: auto;
  position: relative;
  overflow: hidden;
}

.k1-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--k1-accent-cta), var(--k1-accent-tech), var(--k1-accent-data));
}

.k1-footer__brand {
  padding-block: 40px 24px;
  border-bottom: 1px solid rgba(224, 234, 245, 0.08);
  text-align: center;
}

.k1-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.k1-footer__logo-mark {
  font-family: var(--k1-font-headline);
  font-size: 28px;
  font-weight: 700;
  color: var(--k1-accent-data);
  letter-spacing: 0.02em;
}

.k1-footer__logo-text {
  font-family: var(--k1-font-headline);
  font-size: 22px;
  font-weight: 500;
  color: var(--k1-text-primary);
}

.k1-footer__slogan {
  max-width: 560px;
  margin-inline: auto;
  font-size: 14px;
  color: var(--k1-text-secondary);
  line-height: 1.8;
}

.k1-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding-block: 32px 40px;
}

@media (max-width: 768px) {
  .k1-footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-block: 24px;
  }
}

.k1-footer__col {
  min-width: 0;
}

.k1-footer__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--k1-font-headline);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--k1-text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(224, 234, 245, 0.1);
}

.k1-footer__title-index {
  color: var(--k1-accent-tech);
  font-size: 12px;
}

.k1-footer__links li + li,
.k1-footer__contact li + li {
  margin-top: 10px;
}

.k1-footer__links a,
.k1-footer__contact a {
  color: var(--k1-text-secondary);
  font-size: 14px;
  transition: color var(--k1-transition), padding-left var(--k1-transition);
}

.k1-footer__links a:hover,
.k1-footer__contact a:hover {
  color: var(--k1-accent-data);
  padding-left: 4px;
}

.k1-footer__contact {
  font-size: 14px;
  color: var(--k1-text-secondary);
  line-height: 1.8;
}

.k1-footer__legal {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding-block: 20px 24px;
  border-top: 1px solid rgba(224, 234, 245, 0.08);
  font-size: 13px;
  color: var(--k1-text-secondary);
  letter-spacing: 0.03em;
}

@media (min-width: 769px) {
  .k1-footer__legal {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ===== Shared Components ===== */
.k1-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

@media (max-width: 768px) {
  .k1-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
}

.k1-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: var(--k1-radius-md);
  border: 1px solid transparent;
  transition: transform var(--k1-transition), box-shadow var(--k1-transition), background-color var(--k1-transition), color var(--k1-transition);
  position: relative;
  overflow: hidden;
}

.k1-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.15) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 400ms ease;
}

.k1-btn:hover::after {
  transform: translateX(120%);
}

.k1-btn--primary {
  background-color: var(--k1-accent-cta);
  color: #FFFFFF;
  box-shadow: 0 8px 24px rgba(255, 46, 76, 0.3);
}

.k1-btn--primary:hover {
  background-color: #ff4d5e;
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(255, 46, 76, 0.4);
}

.k1-btn--ghost {
  border-color: rgba(224, 234, 245, 0.35);
  color: var(--k1-text-primary);
  background-color: transparent;
}

.k1-btn--ghost:hover {
  border-color: var(--k1-accent-data);
  color: var(--k1-accent-data);
  transform: translateY(-2px);
  background-color: rgba(57, 255, 136, 0.04);
}

.k1-btn--green {
  background-color: var(--k1-accent-data);
  color: var(--k1-bg-deep);
  box-shadow: 0 8px 24px rgba(57, 255, 136, 0.25);
}

.k1-btn--green:hover {
  color: var(--k1-bg-deep);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(57, 255, 136, 0.35);
}

.k1-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--k1-text-secondary);
  padding-block: 16px;
  border-bottom: 1px solid rgba(224, 234, 245, 0.08);
  margin-bottom: 28px;
}

.k1-breadcrumb a {
  color: var(--k1-text-secondary);
}

.k1-breadcrumb a:hover {
  color: var(--k1-accent-data);
}

.k1-breadcrumb__separator {
  color: var(--k1-accent-tech);
  opacity: 0.6;
}

.k1-breadcrumb__current {
  color: var(--k1-text-primary);
  font-weight: 500;
}

.k1-section-index {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--k1-font-headline);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--k1-accent-tech);
  text-transform: uppercase;
}

.k1-section-index::before {
  content: '';
  width: 24px;
  height: 1px;
  background-color: var(--k1-accent-tech);
  opacity: 0.5;
}

.k1-coordinate-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--k1-text-secondary);
}

.k1-coordinate-tag::before {
  content: '⌖';
  color: var(--k1-accent-data);
  font-size: 14px;
}

.k1-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2000;
  background-color: transparent;
  pointer-events: none;
}

.k1-progress__bar {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--k1-accent-data), var(--k1-accent-tech), var(--k1-accent-cta));
  transition: width 100ms linear;
}

.k1-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.k1-toc__item {
  margin: 0;
}

.k1-toc__link {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  border: 1px solid rgba(224, 234, 245, 0.2);
  border-radius: 999px;
  color: var(--k1-text-secondary);
  transition: border-color var(--k1-transition), color var(--k1-transition), background-color var(--k1-transition);
}

.k1-toc__link:hover,
.k1-toc__link.is-active {
  border-color: var(--k1-accent-data);
  color: var(--k1-accent-data);
  background-color: rgba(57, 255, 136, 0.06);
}

.k1-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--k1-text-secondary);
}

.k1-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.k1-legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.k1-legend-dot--green {
  background-color: var(--k1-accent-data);
  box-shadow: 0 0 8px rgba(57, 255, 136, 0.5);
}

.k1-legend-dot--red {
  background-color: var(--k1-accent-cta);
  box-shadow: 0 0 8px rgba(255, 46, 76, 0.5);
}

.k1-legend-dot--yellow {
  background-color: var(--k1-accent-label);
  box-shadow: 0 0 8px rgba(255, 209, 102, 0.5);
}

.k1-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  border-radius: 999px;
  line-height: 1.6;
}

.k1-tag--live {
  background-color: rgba(57, 255, 136, 0.12);
  color: var(--k1-accent-data);
  border: 1px solid rgba(57, 255, 136, 0.35);
}

.k1-tag--hot {
  background-color: rgba(255, 46, 76, 0.12);
  color: var(--k1-accent-cta);
  border: 1px solid rgba(255, 46, 76, 0.35);
}

.k1-tag--info {
  background-color: rgba(122, 92, 255, 0.12);
  color: var(--k1-accent-tech);
  border: 1px solid rgba(122, 92, 255, 0.35);
}

.k1-tag--version {
  background-color: rgba(255, 209, 102, 0.12);
  color: var(--k1-accent-label);
  border: 1px solid rgba(255, 209, 102, 0.35);
}

/* ===== Section Typography Helpers ===== */
.k1-section-title {
  font-family: var(--k1-font-headline);
  font-weight: 200;
  font-size: clamp(32px, 7vw, 78px);
  line-height: 1.02;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.k1-section-subtitle {
  font-size: 18px;
  line-height: 1.6;
  color: var(--k1-text-secondary);
  max-width: 680px;
}

.k1-mega-label {
  font-family: var(--k1-font-headline);
  font-size: 13px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--k1-accent-data);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.k1-mega-label::before {
  content: '';
  width: 28px;
  height: 1px;
  background-color: var(--k1-accent-data);
}

/* ===== Image Container Placeholder ===== */
.k1-image-placeholder {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background-color: var(--k1-bg-mid);
  background-image:
    linear-gradient(135deg, rgba(122, 92, 255, 0.08) 25%, transparent 25%),
    linear-gradient(225deg, rgba(224, 234, 245, 0.04) 25%, transparent 25%);
  background-size: 40px 40px;
  border: 1px solid rgba(224, 234, 245, 0.08);
}

.k1-image-placeholder::before {
  content: attr(data-label);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--k1-text-secondary);
  text-align: center;
  padding: 8px;
}

.k1-image-placeholder--ghost {
  border-style: dashed;
  border-color: rgba(224, 234, 245, 0.2);
}

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