:root {
  --yk-dark: #0A1B3D;
  --yk-dark-deep: #081528;
  --yk-mid: #1E3A8A;
  --yk-orange: #FF6B35;
  --yk-orange-deep: #E8552A;
  --yk-purple: #8A2BE2;
  --yk-magenta: #FF1493;
  --yk-bg: #F5F7FA;
  --yk-white: #FFFFFF;
  --yk-ink: #333333;
  --yk-gray: rgba(10,27,61,.55);
  --yk-line: rgba(10,27,61,.08);
  --yk-green: #14B8A6;
  --yk-amber: #FBBF24;
  --yk-font-sans: "Noto Sans SC", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --yk-font-serif: "Noto Serif SC", "Source Han Serif SC", -apple-system, BlinkMacSystemFont, "Songti SC", "Times New Roman", serif;
  --yk-sidebar-width: 272px;
  --yk-header-h-mobile: 64px;
  --yk-shadow-sm: 0 1px 2px rgba(10,27,61,.05);
  --yk-shadow-md: 0 8px 24px rgba(10,27,61,.08);
}

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

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

body {
  margin: 0;
  font-family: var(--yk-font-serif);
  background: var(--yk-bg);
  color: var(--yk-ink);
  line-height: 1.7;
}

h1, h2, h3, h4, h5 {
  font-family: var(--yk-font-sans);
  color: var(--yk-dark);
  margin: 0 0 .5em;
  line-height: 1.2;
  font-weight: 900;
}

p {
  margin: 0 0 1em;
}

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

a {
  color: var(--yk-orange);
  text-decoration: none;
}

a:hover {
  color: var(--yk-orange-deep);
  text-decoration: underline;
}

.yunkai-main {
  margin-left: var(--yk-sidebar-width);
  min-height: 72vh;
  background: var(--yk-bg);
  outline: none;
}

.yunkai-main:focus {
  outline: none;
}

.yunkai-skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--yk-sidebar-width) + 10px);
  z-index: 2000;
  background: var(--yk-orange);
  color: #fff;
  padding: 10px 18px;
  font-family: var(--yk-font-sans);
  font-weight: 800;
  font-size: 14px;
  box-shadow: 0 4px 14px rgba(0,0,0,.22);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity .18s ease, transform .18s ease;
}

.yunkai-skip-link:focus {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  color: #fff;
  text-decoration: none;
}

.yunkai-header {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--yk-sidebar-width);
  background:
    radial-gradient(circle at 18% 8%, rgba(138,43,226,.22), transparent 46%),
    linear-gradient(180deg, var(--yk-dark) 0%, var(--yk-dark-deep) 100%);
  border-right: 1px solid rgba(255,255,255,.06);
  z-index: 1000;
  display: flex;
  flex-direction: column;
}

.yunkai-header-inner {
  flex: 1;
  padding: 28px 20px 24px 24px;
  display: flex;
  flex-direction: column;
}

.yunkai-progress-bar {
  position: fixed;
  top: 0;
  left: var(--yk-sidebar-width);
  right: 0;
  height: 4px;
  background: rgba(255,255,255,.1);
  z-index: 1200;
  overflow: hidden;
  pointer-events: none;
}

.yunkai-progress-bar span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--yk-orange) 0%, var(--yk-magenta) 100%);
  transition: width .12s linear;
}

.yunkai-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
  margin-bottom: 32px;
}

.yunkai-brand:hover {
  color: #fff;
  text-decoration: none;
}

.yunkai-brand-logo {
  display: inline-grid;
  grid-template-columns: 6px 6px 6px;
  gap: 4px;
  align-items: end;
  height: 32px;
  flex: none;
}

.yunkai-brand-logo span {
  display: block;
  background: var(--yk-orange);
}

.yunkai-brand-logo span:nth-child(1) {
  height: 14px;
}

.yunkai-brand-logo span:nth-child(2) {
  height: 28px;
  background: linear-gradient(180deg, var(--yk-orange), var(--yk-magenta));
}

.yunkai-brand-logo span:nth-child(3) {
  height: 20px;
  background: var(--yk-purple);
}

.yunkai-brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.yunkai-brand-name {
  font-family: var(--yk-font-sans);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .03em;
  color: #fff;
  line-height: 1.1;
}

.yunkai-brand-name em {
  font-style: normal;
  color: var(--yk-orange);
  font-weight: 900;
}

.yunkai-brand-tagline {
  font-family: var(--yk-font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .24em;
  color: rgba(255,255,255,.4);
}

.yunkai-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 44px;
  min-height: 44px;
  background: transparent;
  border: 1px solid rgba(255,255,255,.15);
  color: #fff;
  cursor: pointer;
  font-family: var(--yk-font-sans);
  padding: 0 12px;
  margin-left: auto;
}

.yunkai-nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform .2s ease, opacity .2s ease;
}

body[data-nav-open] .yunkai-nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

body[data-nav-open] .yunkai-nav-toggle-line:nth-child(2) {
  opacity: 0;
}

body[data-nav-open] .yunkai-nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.yunkai-nav-toggle-text {
  font-size: 12px;
  font-weight: 700;
}

.yunkai-nav {
  flex: 1;
}

.yunkai-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: yk-nav;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

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

.yunkai-nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  color: rgba(255,255,255,.62);
  font-family: var(--yk-font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.yunkai-nav-link::before {
  content: "0" counter(yk-nav);
  font-size: 11px;
  font-weight: 800;
  color: var(--yk-orange);
  letter-spacing: .12em;
  flex: none;
}

.yunkai-nav-link:hover,
.yunkai-nav-link:focus-visible {
  color: #fff;
  background: linear-gradient(90deg, rgba(255,107,53,.14), transparent 88%);
  border-left-color: var(--yk-orange);
  text-decoration: none;
}

.yunkai-nav-link[aria-current="page"] {
  color: #fff;
  border-left-color: var(--yk-orange);
  background: linear-gradient(90deg, rgba(255,107,53,.18), transparent 78%);
  box-shadow: inset 0 0 0 1px rgba(255,107,53,.08);
}

.yunkai-nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--yk-orange);
  transform: translateY(-50%) rotate(45deg);
}

.yunkai-header-meta {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--yk-font-sans);
  font-size: 12px;
  color: rgba(255,255,255,.45);
}

.yunkai-status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.yunkai-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yk-green);
  box-shadow: 0 0 0 2px rgba(20,184,166,.2);
}

.yunkai-version {
  letter-spacing: .08em;
}

.yunkai-footer {
  margin-left: var(--yk-sidebar-width);
  background: linear-gradient(135deg, var(--yk-dark) 0%, var(--yk-dark-deep) 90%);
  color: rgba(255,255,255,.75);
  border-top: 4px solid var(--yk-orange);
  position: relative;
}

.yunkai-footer::before {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--yk-purple), var(--yk-magenta));
}

.yunkai-footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 48px 32px 24px;
}

.yunkai-footer-main {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
}

.yunkai-footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.yunkai-footer-logo {
  font-family: var(--yk-font-sans);
  font-size: 24px;
  font-weight: 900;
  color: #fff;
  letter-spacing: .03em;
}

.yunkai-footer-logo span {
  color: var(--yk-orange);
}

.yunkai-footer-logo:hover {
  color: #fff;
  text-decoration: none;
}

.yunkai-footer-desc {
  margin: 12px 0 0;
  font-size: 14px;
  color: rgba(255,255,255,.5);
  line-height: 1.7;
}

.yunkai-footer-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .06em;
  color: #fff;
  margin: 0 0 16px;
  text-transform: uppercase;
}

.yunkai-footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.yunkai-footer-links a {
  color: rgba(255,255,255,.65);
  font-size: 14px;
  transition: color .2s ease, padding-left .2s ease;
}

.yunkai-footer-links a:hover {
  color: var(--yk-orange);
  padding-left: 6px;
  text-decoration: none;
}

.yunkai-footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: rgba(255,255,255,.65);
  line-height: 1.6;
}

.yunkai-footer-contact a {
  color: var(--yk-orange);
}

.yunkai-footer-contact a:hover {
  color: #fff;
  text-decoration: none;
}

.yunkai-footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,.08);
  margin-top: 40px;
  padding-top: 20px;
  font-size: 13px;
  color: rgba(255,255,255,.42);
}

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

.yunkai-footer-icp a {
  color: rgba(255,255,255,.5);
}

.yunkai-footer-icp a:hover {
  color: var(--yk-orange);
}

.yunkai-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.yunkai-container--wide {
  max-width: 1320px;
}

.yunkai-section {
  padding: 56px 0;
}

.yunkai-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  font-family: var(--yk-font-sans);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .03em;
  line-height: 1;
  color: #fff;
  background: var(--yk-orange);
  border: 0;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
}

.yunkai-btn:hover {
  background: var(--yk-orange-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255,107,53,.25);
  text-decoration: none;
  color: #fff;
}

.yunkai-btn:active {
  transform: translateY(0);
}

.yunkai-btn--ghost {
  background: transparent;
  border: 1px solid currentColor;
  color: var(--yk-dark);
  clip-path: none;
}

.yunkai-btn--ghost:hover {
  background: var(--yk-dark);
  color: #fff;
  border-color: var(--yk-dark);
}

.yunkai-btn--light {
  background: #fff;
  color: var(--yk-dark);
}

.yunkai-btn--light:hover {
  background: #f0f2f6;
  color: var(--yk-dark);
}

.yunkai-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px 4px 14px;
  font-family: var(--yk-font-sans);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  color: #fff;
  background: linear-gradient(90deg, var(--yk-purple), var(--yk-magenta));
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.yunkai-tag--orange {
  background: linear-gradient(90deg, var(--yk-orange), var(--yk-magenta));
}

.yunkai-tag--dark {
  background: var(--yk-dark);
  color: rgba(255,255,255,.8);
}

.yunkai-breadcrumb {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  font-family: var(--yk-font-sans);
  font-size: 13px;
}

.yunkai-breadcrumb li {
  display: flex;
  align-items: center;
  color: var(--yk-gray);
}

.yunkai-breadcrumb li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(10,27,61,.25);
}

.yunkai-breadcrumb a {
  color: var(--yk-orange);
  font-weight: 600;
}

.yunkai-breadcrumb a:hover {
  color: var(--yk-orange-deep);
  text-decoration: underline;
}

.yunkai-breadcrumb [aria-current="page"] {
  color: var(--yk-dark);
  font-weight: 700;
}

.yunkai-bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}

.yunkai-bento > * {
  grid-column: span 12;
}

@media (min-width: 576px) {
  .yunkai-bento > * {
    grid-column: span 6;
  }
}

@media (min-width: 992px) {
  .yunkai-bento > [data-size="xl"] {
    grid-column: span 12;
  }

  .yunkai-bento > [data-size="lg"] {
    grid-column: span 8;
  }

  .yunkai-bento > [data-size="md"] {
    grid-column: span 6;
  }

  .yunkai-bento > [data-size="sm"] {
    grid-column: span 4;
  }

  .yunkai-bento > [data-size="xs"] {
    grid-column: span 3;
  }

  .yunkai-bento > [data-size="half"] {
    grid-column: span 6;
  }
}

.yunkai-card {
  position: relative;
  background: var(--yk-white);
  border: 1px solid var(--yk-line);
  padding: 24px;
  box-shadow: var(--yk-shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.yunkai-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--yk-shadow-md);
  border-color: rgba(255,107,53,.35);
}

.yunkai-card--dark {
  background: var(--yk-dark);
  color: rgba(255,255,255,.78);
  border: none;
}

.yunkai-card--dark h1,
.yunkai-card--dark h2,
.yunkai-card--dark h3,
.yunkai-card--dark h4 {
  color: #fff;
}

.yunkai-card--accent {
  background: var(--yk-orange);
  color: #fff;
  border: none;
}

.yunkai-card--accent h1,
.yunkai-card--accent h2,
.yunkai-card--accent h3,
.yunkai-card--accent h4 {
  color: #fff;
}

.yunkai-media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--yk-mid) 0%, var(--yk-dark) 100%);
  aspect-ratio: 4 / 3;
  display: block;
}

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

.yunkai-media--square {
  aspect-ratio: 1 / 1;
}

.yunkai-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 20%, rgba(255,107,53,.18) 50%, transparent 80%);
  transform: translateX(-32%);
  transition: transform .45s ease;
  pointer-events: none;
}

.yunkai-media:hover::after {
  transform: translateX(32%);
}

.yunkai-media-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.yunkai-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.yunkai-stat-label {
  font-family: var(--yk-font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--yk-gray);
  text-transform: uppercase;
}

.yunkai-stat-value {
  font-family: var(--yk-font-sans);
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: var(--yk-dark);
}

.yunkai-stat-value--orange {
  color: var(--yk-orange);
}

.yunkai-note {
  writing-mode: vertical-rl;
  font-family: var(--yk-font-sans);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .18em;
  color: var(--yk-orange);
  text-transform: uppercase;
  border-left: 2px solid rgba(255,107,53,.25);
  padding-left: 10px;
  max-height: 120px;
}

.yunkai-line {
  display: block;
  width: 56px;
  height: 3px;
  background: linear-gradient(90deg, var(--yk-orange), var(--yk-magenta));
  border: 0;
  margin: 16px 0 20px;
}

:focus-visible {
  outline: 3px solid var(--yk-orange);
  outline-offset: 2px;
}

.yunkai-nav-link:focus-visible {
  outline: 2px solid var(--yk-orange);
  outline-offset: -2px;
}

@media (max-width: 960px) {
  .yunkai-main {
    margin-left: 0;
    min-height: 60vh;
  }

  .yunkai-skip-link {
    left: 10px;
    top: 10px;
  }

  .yunkai-header {
    position: sticky;
    top: 0;
    width: auto;
    height: auto;
    min-height: var(--yk-header-h-mobile);
    border-right: 0;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }

  .yunkai-header-inner {
    padding: 10px 16px;
    flex-direction: row;
    align-items: center;
    gap: 8px;
  }

  .yunkai-brand {
    margin-bottom: 0;
    margin-right: auto;
  }

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

  .yunkai-nav {
    display: none;
    position: fixed;
    top: var(--yk-header-h-mobile);
    left: 0;
    right: 0;
    bottom: 0;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--yk-dark) 0%, var(--yk-dark-deep) 100%);
    padding: 16px 12px 32px;
    border-top: 1px solid rgba(255,255,255,.08);
    box-shadow: 0 12px 24px rgba(0,0,0,.3);
  }

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

  .yunkai-nav-link {
    font-size: 16px;
    padding: 14px 12px;
  }

  .yunkai-header-meta {
    display: none;
  }

  .yunkai-progress-bar {
    left: 0;
  }

  .yunkai-footer {
    margin-left: 0;
  }

  .yunkai-footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .yunkai-footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .yunkai-footer-bottom {
    flex-direction: column;
  }
}

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

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .yunkai-progress-bar span {
    transition: none;
  }
}