:root {
  --bg: #ffffff;
  --surface: rgba(255, 255, 255, 0.68);
  --paper: #f5f7fb;
  --text: #333333;
  --muted: #666666;
  --muted-2: #666666;

  --primary: #007aff;
  --primary-2: #0062cc;
  --accent: #007aff;

  --border: rgba(17, 24, 39, 0.12);
  --border-strong: rgba(17, 24, 39, 0.16);

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 14px 40px rgba(15, 23, 42, 0.14);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --container: 1200px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
  background: radial-gradient(900px 520px at 22% 12%, rgba(0, 122, 255, 0.14), rgba(0, 122, 255, 0)), radial-gradient(700px 420px at 88% 6%, rgba(0, 122, 255, 0.08), rgba(0, 122, 255, 0)), var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: 72px;
}

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

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

a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.kl-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

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

.kl-section--tight {
  padding: 40px 0;
}

.kl-surface {
  background: var(--surface);
}

.kl-paper {
  background: rgba(245, 247, 251, 0.72);
  color: var(--text);
}

.kl-muted {
  color: var(--muted);
}

.kl-muted-2 {
  color: var(--muted-2);
}

.kl-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(17, 24, 39, 0.12);
  color: rgba(51, 51, 51, 0.82);
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(12px);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.kl-title {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.kl-title--h1 {
  font-size: 52px;
}

.kl-title--h2 {
  font-size: 32px;
}

.kl-lead {
  margin: 16px 0 0;
  font-size: 18px;
  color: var(--muted);
}

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

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

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

.kl-card {
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 24, 39, 0.12);
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}

.kl-card--paper {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(17, 24, 39, 0.12);
  color: var(--text);
}

.kl-card__inner {
  padding: 24px;
}

.kl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.12s ease, background-color 0.12s ease, border-color 0.12s ease;
  user-select: none;
}

.kl-btn:active {
  transform: translateY(1px);
}

.kl-btn--primary {
  background: var(--primary);
  color: #fff;
}

.kl-btn--primary:hover {
  background: var(--primary-2);
}

.kl-btn--ghost {
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(17, 24, 39, 0.14);
  color: var(--text);
}

.kl-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.9);
}

.kl-btn--paper {
  background: rgba(255, 255, 255, 0.82);
  border-color: rgba(17, 24, 39, 0.12);
  color: var(--text);
}

.kl-btn--paper:hover {
  background: rgba(245, 247, 251, 0.9);
}

.kl-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(0, 122, 255, 0.10);
  color: rgba(0, 122, 255, 0.98);
  border: 1px solid rgba(0, 122, 255, 0.22);
  font-size: 13px;
}

.kl-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(17, 24, 39, 0.12);
}

.kl-nav__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.kl-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.kl-brand__mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(0, 122, 255, 0.08);
  border: 1px solid rgba(0, 122, 255, 0.16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.kl-brand__name {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.kl-nav__menu {
  display: flex;
  align-items: center;
  gap: 18px;
}

.kl-nav__link {
  color: rgba(51, 51, 51, 0.88);
  font-weight: 600;
  font-size: 14px;
}

.kl-nav__link:hover {
  color: rgba(0, 122, 255, 0.98);
  text-decoration: none;
}

.kl-nav__right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.kl-nav__toggle {
  display: none;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(17, 24, 39, 0.14);
  color: rgba(51, 51, 51, 0.92);
  height: 40px;
  width: 40px;
  border-radius: var(--radius-sm);
}

.kl-hero {
  padding: 64px 0 56px;
}

.kl-hero__wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
}

.kl-hero__panel {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(17, 24, 39, 0.12);
  background:
    radial-gradient(900px 480px at 22% 16%, rgba(0, 122, 255, 0.22), rgba(0, 122, 255, 0)),
    radial-gradient(700px 420px at 92% 24%, rgba(0, 122, 255, 0.10), rgba(0, 122, 255, 0)),
    rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.kl-hero__panel-inner {
  padding: 28px;
}

.kl-hero__cta {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}

.kl-hero__trust {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.kl-hero__center {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.kl-hero__cta--center {
  justify-content: center;
}

.kl-hero__trust--center {
  justify-content: center;
}

.kl-hero__image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(17, 24, 39, 0.12);
  background: rgba(255, 255, 255, 0.72);
}

.kl-kpi {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.kl-kpi__item {
  border-radius: 14px;
  border: 1px solid rgba(17, 24, 39, 0.12);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  padding: 16px;
}

.kl-kpi__value {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.02em;
}

.kl-kpi__label {
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.kl-icon {
  width: 18px;
  height: 18px;
  display: inline-block;
}

.kl-icon--lg {
  width: 22px;
  height: 22px;
}

.kl-icon--xl {
  width: 28px;
  height: 28px;
}

.kl-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.kl-icon--on-primary {
  color: #fff;
}

.kl-icon--on-paper {
  color: var(--text);
}

.kl-feature__title {
  margin: 14px 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.kl-showcase {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.kl-showcase__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 122, 255, 0.10);
  border: 1px solid rgba(0, 122, 255, 0.18);
  font-size: 20px;
  line-height: 1;
  flex: 0 0 auto;
}

.kl-showcase__body {
  min-width: 0;
}

.kl-showcase__title {
  font-weight: 800;
  letter-spacing: -0.01em;
}

.kl-emoji {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 122, 255, 0.08);
  border: 1px solid rgba(0, 122, 255, 0.16);
  font-size: 22px;
  line-height: 1;
}

.kl-summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 700;
}

.kl-summary::-webkit-details-marker {
  display: none;
}

details[open] > .kl-summary {
  border-bottom: 1px solid rgba(17, 24, 39, 0.12);
}

.kl-news {
  display: grid;
  gap: 16px;
}

.kl-news__item {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(17, 24, 39, 0.12);
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}

.kl-news__link {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
  text-decoration: none;
}

.kl-news__media {
  background: rgba(245, 247, 251, 0.9);
}

.kl-news__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.kl-news__content {
  padding: 18px 18px 18px 0;
}

.kl-news__title {
  margin: 0;
  font-size: 16px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.kl-news__meta {
  margin-top: 8px;
  font-size: 13px;
}

.kl-news__desc {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}

.kl-news__action {
  margin-top: 14px;
}

.kl-feature__desc {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.kl-paper .kl-feature__desc {
  color: var(--muted-2);
}

.kl-divider {
  border-top: 1px solid rgba(17, 24, 39, 0.12);
}

.kl-footer {
  padding: 56px 0;
  border-top: 1px solid rgba(17, 24, 39, 0.12);
}

.kl-footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 24px;
}

.kl-footer__title {
  font-weight: 800;
  margin: 0 0 10px;
}

.kl-footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.kl-footer__list a {
  color: rgba(51, 51, 51, 0.82);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
}

.kl-footer__list a:hover {
  color: rgba(0, 122, 255, 0.98);
  text-decoration: none;
}

.kl-subfooter {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid rgba(17, 24, 39, 0.12);
  color: rgba(51, 51, 51, 0.72);
  font-size: 13px;
}

.kl-article {
  max-width: 860px;
}

.kl-prose {
  color: var(--text);
}

.kl-paper .kl-prose {
  color: var(--text);
}

.kl-prose p {
  margin: 0 0 16px;
}

.kl-prose h2,
.kl-prose h3 {
  margin: 28px 0 14px;
  line-height: 1.25;
}

.kl-prose a {
  color: var(--primary);
  text-decoration: none;
}

.kl-prose a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.kl-prose img {
  border-radius: 14px;
  border: 1px solid rgba(17, 24, 39, 0.12);
}

.kl-prose blockquote {
  margin: 18px 0;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: rgba(0, 122, 255, 0.06);
  border-radius: 12px;
}

.kl-paper .kl-prose blockquote {
  background: rgba(255, 255, 255, 0.72);
}

.kl-pagination {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.kl-pagination a,
.kl-pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: 12px;
  border: 1px solid rgba(17, 24, 39, 0.12);
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.kl-pagination a:hover {
  background: rgba(245, 247, 251, 0.9);
}

.kl-pagination .cur,
.kl-pagination .current {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

@media (max-width: 980px) {
  .kl-hero__wrap {
    grid-template-columns: 1fr;
  }
  .kl-kpi {
    grid-template-columns: 1fr;
  }
  .kl-grid-3 {
    grid-template-columns: 1fr;
  }
  .kl-grid-2 {
    grid-template-columns: 1fr;
  }
  .kl-nav__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .kl-nav__menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    padding: 16px 24px 18px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(17, 24, 39, 0.12);
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .kl-nav__menu[aria-hidden="false"] {
    display: flex;
  }
  .kl-footer__grid {
    grid-template-columns: 1fr;
  }

  .kl-news__link {
    grid-template-columns: 1fr;
  }

  .kl-news__content {
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto;
    transition: none;
  }
}