:root {
  --ky-navy: #0B1B3A;
  --ky-orange: #FF6B35;
  --ky-silver: #C0C0C0;
  --ky-green: #39FF14;
  --ky-teal: #0E4C5C;
  --ky-wine: #7B2D3B;
  --ky-indigo: #3C2A5D;
  --ky-bg: #F5F7FA;
  --ky-text: #1A1A2E;
  --ky-inverse: #FFFFFF;
  --ky-link: #FF6B35;
  --ky-font-head: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ky-font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ky-font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --ky-h1: clamp(32px, 5vw, 46px);
  --ky-h2: clamp(24px, 3vw, 32px);
  --ky-h3: 24px;
  --ky-body: 16px;
  --ky-caption: 14px;
  --ky-mono-index: 18px;
  --ky-space: 24px;
  --ky-rail-w: 240px;
  --ky-header-h: 64px;
  --ky-content-max: 1200px;
}

@media (min-width: 1200px) {
  :root {
    --ky-rail-w: 264px;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--ky-font-body);
  font-size: var(--ky-body);
  line-height: 1.6;
  color: var(--ky-text);
  background: var(--ky-navy);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--ky-link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4,
h5 {
  font-family: var(--ky-font-head);
  line-height: 1.25;
  color: var(--ky-navy);
}

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

.ky-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;
}

.ky-skip {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 2000;
  background: var(--ky-orange);
  color: var(--ky-inverse);
  font-weight: 700;
  font-size: 14px;
  padding: 10px 16px;
  transition: top 0.2s ease;
}

.ky-skip:focus {
  top: 12px;
  outline: none;
}

.ky-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(192, 192, 192, 0.18);
  z-index: 1500;
  pointer-events: none;
}

.ky-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--ky-orange);
  transform: scaleX(0);
  transform-origin: left top;
}

.ky-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--ky-rail-w);
  height: 100vh;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 32px 24px 28px;
  background: linear-gradient(180deg, rgba(11, 27, 58, 0.55) 0%, rgba(11, 27, 58, 0.12) 50%, transparent 100%);
  border-right: 1px solid rgba(192, 192, 192, 0.18);
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.ky-header.is-scrolled {
  background: var(--ky-navy);
  border-right-color: rgba(192, 192, 192, 0.3);
  box-shadow: 4px 0 16px rgba(0, 0, 0, 0.2);
}

.ky-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  flex: none;
  color: var(--ky-inverse);
}

.ky-brand:hover {
  text-decoration: none;
}

.ky-brand__mark {
  width: 32px;
  height: 4px;
  background: var(--ky-orange);
  clip-path: polygon(0 0, 100% 0, 65% 100%, 0 100%);
}

.ky-brand__name {
  font-family: var(--ky-font-head);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: inherit;
}

.ky-brand__en {
  font-family: var(--ky-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ky-silver);
  text-transform: uppercase;
}

.ky-nav {
  margin-top: 44px;
  margin-bottom: auto;
}

.ky-nav__list {
  list-style: none;
  position: relative;
  padding-left: 14px;
}

.ky-nav__list::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--ky-orange) 0%, rgba(255, 255, 255, 0.18) 100%);
}

.ky-nav__item {
  margin: 0;
}

.ky-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 6px;
  font-family: var(--ky-font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--ky-silver);
  border-radius: 2px;
  transition: color 0.2s ease, background 0.2s ease;
}

.ky-nav__link::before {
  content: "";
  position: absolute;
  left: -15px;
  top: 50%;
  width: 8px;
  height: 8px;
  border: 1px solid var(--ky-orange);
  background: var(--ky-navy);
  transform: translateY(-50%) rotate(45deg);
}

.ky-nav__link:hover {
  color: var(--ky-inverse);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.14), transparent 70%);
  text-decoration: none;
}

.ky-nav__link:hover::before {
  background: var(--ky-orange);
}

.ky-nav__link[aria-current="page"] {
  color: var(--ky-orange);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.18), transparent 65%);
}

.ky-nav__link[aria-current="page"]::before {
  background: var(--ky-orange);
  box-shadow: 0 0 8px var(--ky-orange);
}

.ky-nav__idx {
  font-family: var(--ky-font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  min-width: 24px;
}

.ky-nav__link[aria-current="page"] .ky-nav__idx {
  color: var(--ky-orange);
}

.ky-nav__label {
  white-space: nowrap;
}

.ky-sideinfo {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ky-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid rgba(192, 192, 192, 0.18);
  border-left: 2px solid var(--ky-green);
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ky-silver);
  background: rgba(11, 27, 58, 0.25);
}

.ky-status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ky-green);
  box-shadow: 0 0 6px var(--ky-green);
  animation: ky-pulse 2s ease-in-out infinite;
}

@keyframes ky-pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.35;
  }
}

.ky-locator {
  text-align: right;
}

.ky-locator__label {
  display: inline-block;
  max-width: 100%;
  padding: 5px 8px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ky-silver);
  background: rgba(192, 192, 192, 0.08);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-left: 2px solid var(--ky-orange);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ky-burger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(192, 192, 192, 0.3);
  border-radius: 2px;
  cursor: pointer;
  flex: none;
}

.ky-burger:hover {
  border-color: var(--ky-orange);
}

.ky-burger__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ky-inverse);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

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

.ky-burger[aria-expanded="true"] .ky-burger__bar:nth-child(2) {
  opacity: 0;
}

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

.ky-main {
  margin-left: var(--ky-rail-w);
  min-height: 70vh;
  background: var(--ky-bg);
  position: relative;
}

.ky-container {
  max-width: var(--ky-content-max);
  margin: 0 auto;
  padding: var(--ky-space) clamp(20px, 4vw, 48px) 72px;
}

.ky-container--narrow {
  max-width: 820px;
}

.ky-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 22px;
  font-family: var(--ky-font-head);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  color: var(--ky-inverse);
  background: transparent;
  border: none;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  cursor: pointer;
  transition: filter 0.2s ease, transform 0.2s ease;
  text-decoration: none;
}

.ky-btn:hover {
  filter: brightness(0.92);
  transform: translateY(1px);
  text-decoration: none;
}

.ky-btn--primary {
  background: var(--ky-orange);
  color: var(--ky-inverse);
}

.ky-btn--ghost {
  background: rgba(255, 255, 255, 0.12);
  color: var(--ky-inverse);
}

.ky-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ky-orange);
}

.ky-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--ky-orange);
  flex: none;
}

.ky-cover {
  position: relative;
  overflow: hidden;
  margin-left: calc(-1 * var(--ky-rail-w));
  padding: 96px calc(var(--ky-space) * 1.5) 64px calc(var(--ky-rail-w) + var(--ky-space) * 1.5);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--ky-inverse);
  background: linear-gradient(115deg, var(--ky-navy) 0%, var(--ky-teal) 48%, var(--ky-indigo) 100%);
}

.ky-cover__title {
  max-width: 13em;
  font-family: var(--ky-font-head);
  font-size: var(--ky-h1);
  font-weight: 900;
  line-height: 1.18;
  color: var(--ky-inverse);
  margin-bottom: 20px;
}

.ky-cover__lede {
  max-width: 500px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 28px;
}

.ky-section {
  padding: 64px 0;
  scroll-margin-top: 24px;
}

.ky-section__head {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  align-items: end;
  margin-bottom: 32px;
}

.ky-section__num {
  display: inline-block;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-mono-index);
  font-weight: 500;
  line-height: 1.2;
  color: var(--ky-orange);
  border-bottom: 2px solid var(--ky-orange);
  padding-bottom: 4px;
}

.ky-section__title {
  font-family: var(--ky-font-head);
  font-size: var(--ky-h2);
  font-weight: 900;
  line-height: 1.25;
  color: var(--ky-navy);
}

.ky-section__body {
  max-width: 720px;
  font-size: 15px;
  color: var(--ky-text);
}

.ky-grid {
  display: grid;
  gap: var(--ky-space);
}

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

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

.ky-card {
  position: relative;
  background: var(--ky-inverse);
  border: 1px solid rgba(192, 192, 192, 0.6);
  padding: var(--ky-space);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: transform 0.2s ease, background 0.2s ease;
}

.ky-card:hover {
  transform: translateY(-2px);
  background: #ffffff;
}

.ky-card--accent {
  border-top: 3px solid var(--ky-orange);
}

.ky-card__title {
  font-family: var(--ky-font-head);
  font-size: 18px;
  font-weight: 900;
  margin-bottom: 8px;
  color: var(--ky-navy);
}

.ky-card__meta {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ky-silver);
  margin-bottom: 12px;
}

.ky-card__text {
  font-size: 14px;
  color: var(--ky-text);
}

.ky-imgbox {
  position: relative;
  overflow: hidden;
  background: var(--ky-navy);
}

.ky-imgbox::after {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.ky-imgbox--wide::after {
  padding-top: 56.25%;
}

.ky-imgbox--square::after {
  padding-top: 100%;
}

.ky-imgbox--tall::after {
  padding-top: 125%;
}

.ky-imgbox img,
.ky-imgbox .ky-imgbox__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ky-imgbox__bg {
  background-size: cover;
  background-position: center;
}

.ky-breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  color: var(--ky-silver);
  padding: 0;
  margin-bottom: 24px;
}

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

.ky-breadcrumb a {
  color: var(--ky-silver);
}

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

.ky-breadcrumb [aria-current="page"] {
  color: var(--ky-navy);
}

.ky-deco {
  position: absolute;
  top: -20%;
  right: -4%;
  width: 46%;
  height: 140%;
  pointer-events: none;
  background: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.06) 0, rgba(255, 255, 255, 0.06) 1px, transparent 1px, transparent 10px);
  transform: skewX(14deg);
}

.ky-deco--orange {
  background: repeating-linear-gradient(135deg, rgba(255, 107, 53, 0.25) 0, rgba(255, 107, 53, 0.25) 2px, transparent 2px, transparent 12px);
}

.ky-deco--line {
  width: 120px;
  height: 2px;
  background: var(--ky-orange);
  position: absolute;
  transform: skewX(-20deg);
}

.ky-footer {
  margin-left: var(--ky-rail-w);
  position: relative;
  background: var(--ky-navy);
  color: var(--ky-silver);
  border-top: 2px solid var(--ky-indigo);
}

.ky-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--ky-orange) 0 12px, transparent 12px 24px);
  opacity: 0.7;
}

.ky-footer__inner {
  max-width: var(--ky-content-max);
  margin: 0 auto;
  padding: 56px clamp(20px, 4vw, 48px) 40px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
}

.ky-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.ky-footer__brandmark {
  width: 40px;
  height: 4px;
  background: var(--ky-orange);
  clip-path: polygon(0 0, 100% 0, 65% 100%, 0 100%);
}

.ky-footer__brandname {
  font-family: var(--ky-font-head);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--ky-inverse);
}

.ky-footer__desc {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(192, 192, 192, 0.8);
  max-width: 30em;
}

.ky-footer__trust {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(192, 192, 192, 0.55);
  border-left: 2px solid var(--ky-teal);
  padding-left: 10px;
  max-width: 30em;
}

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

.ky-footer__title {
  font-family: var(--ky-font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ky-inverse);
  margin-bottom: 16px;
}

.ky-footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ky-footer__list a {
  color: var(--ky-silver);
  font-size: 14px;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.ky-footer__list a:hover {
  color: var(--ky-orange);
  padding-left: 4px;
}

.ky-footer__list li {
  color: rgba(192, 192, 192, 0.8);
  font-size: 14px;
  line-height: 1.6;
}

.ky-footer__bottom {
  max-width: var(--ky-content-max);
  margin: 0 auto;
  padding: 18px 32px 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid rgba(192, 192, 192, 0.15);
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(192, 192, 192, 0.6);
}

@media (max-width: 1199px) and (min-width: 900px) {
  .ky-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .ky-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 899px) {
  .ky-header {
    position: sticky;
    width: 100%;
    height: var(--ky-header-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 0 16px;
    background: var(--ky-navy);
    border-right: none;
    border-bottom: 1px solid rgba(192, 192, 192, 0.2);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  }

  .ky-header.is-scrolled {
    background: var(--ky-navy);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
  }

  .ky-brand {
    margin-right: auto;
  }

  .ky-brand__en {
    display: none;
  }

  .ky-nav {
    display: none;
    position: fixed;
    top: var(--ky-header-h);
    left: 0;
    right: 0;
    margin: 0;
    padding: 20px 24px 28px;
    background: var(--ky-navy);
    border-bottom: 4px solid var(--ky-orange);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
    overflow-y: auto;
    max-height: calc(100vh - var(--ky-header-h));
  }

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

  .ky-nav__list {
    flex-direction: column;
    gap: 4px;
  }

  .ky-nav__list::before {
    left: 4px;
  }

  .ky-nav__link::before {
    left: -13px;
  }

  .ky-sideinfo {
    display: none;
  }

  .ky-burger {
    display: inline-flex;
  }

  .ky-main,
  .ky-footer {
    margin-left: 0;
  }

  .ky-cover {
    margin-left: 0;
    padding: 96px 24px 64px;
    min-height: calc(100vh - var(--ky-header-h));
  }

  .ky-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .ky-footer__brand {
    grid-column: 1 / -1;
  }

  .ky-section__head {
    grid-template-columns: 64px 1fr;
  }

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

@media (max-width: 599px) {
  .ky-footer__inner {
    grid-template-columns: 1fr;
  }

  .ky-footer__brand {
    grid-column: auto;
  }

  .ky-grid--2,
  .ky-grid--3 {
    grid-template-columns: 1fr;
  }

  .ky-section {
    padding: 40px 0;
  }

  .ky-cover__title {
    font-size: 32px;
  }
}

@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;
  }
}