/**
 * RUNEKT Landing Page Styles
 * @version 4.1.0
 * Palette: Chinese cloud/SaaS blue system, generated login-bg.png
 * Type scale (consistent ratio ~1.25):
 *   H1 hero        : 56px  / 1.10
 *   H2 section     : 32px  / 1.20
 *   H3 card/step   : 18px  / 1.35
 *   Body large     : 17px  / 1.65
 *   Body           : 15px  / 1.65
 *   Small          : 13px  / 1.55
 *   Eyebrow/label  : 12px  / 1.40 (uppercase, tracked)
 */

/* =========================
   Local design tokens
   ========================= */
.rk-landing-page {
  --lp-bg:           #f6f8fb;
  --lp-surface:      #ffffff;
  --lp-ink:          #0a1525;
  --lp-ink-soft:     rgba(10, 21, 37, 0.72);
  --lp-ink-muted:    rgba(10, 21, 37, 0.56);
  --lp-line:         rgba(10, 21, 37, 0.08);
  --lp-line-strong:  rgba(10, 21, 37, 0.14);

  --lp-navy:         #0a1525;
  --lp-navy-deep:    #050b18;
  --lp-navy-mid:     #14253f;
  --lp-cyan:         #4dd0e1;
  --lp-cyan-deep:    #0aa6c2;
  --lp-cyan-soft:    #9fdfeb;
  --lp-sky:          #5bb8d9;
  --lp-violet-blue:  #4a7bd1;

  --lp-grad-deep:    linear-gradient(135deg, #14253f 0%, #0a1525 60%, #050b18 100%);
  --lp-grad-cyan:    linear-gradient(135deg, #4dd0e1 0%, #4a7bd1 100%);
  --lp-grad-text:    linear-gradient(95deg, #0084ff 0%, #0aa6c2 52%, #19a974 100%);

  --lp-shadow-soft:  0 10px 24px rgba(10, 21, 37, 0.05);
  --lp-shadow-card:  0 18px 40px rgba(10, 21, 37, 0.08);
  --lp-shadow-glow:  0 14px 32px rgba(77, 208, 225, 0.30),
                     0 4px 14px rgba(10, 21, 37, 0.14);

  /* Consistent type tokens (px-based for absolute control) */
  --lp-fs-h1:        clamp(42px, 5vw, 64px);
  --lp-fs-h2:        clamp(26px, 2.6vw, 32px);
  --lp-fs-h3:        18px;
  --lp-fs-lead:      clamp(16px, 1.4vw, 17px);
  --lp-fs-body:      15px;
  --lp-fs-sm:        13px;
  --lp-fs-eyebrow:   12px;

  --lp-lh-tight:     1.08;
  --lp-lh-snug:      1.30;
  --lp-lh-normal:    1.55;
  --lp-lh-relaxed:   1.65;

  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--lp-bg);
  color: var(--lp-ink);
  font-family: var(--rk-font-active);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-relaxed);
  overflow-x: clip;

  word-break: keep-all;
  overflow-wrap: break-word;
}

/* =========================
   Animations
   ========================= */
@keyframes rk-fade-in-up {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes rk-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes rk-pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(1.30); }
}

/* =========================
   Header
   ========================= */
.rk-landing-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--rk-z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 64px;
  padding: 0 clamp(20px, 5vw, 64px);
  background: rgba(244, 247, 251, 0.85);
  border-bottom: 1px solid var(--lp-line);
  backdrop-filter: saturate(150%) blur(18px);
}

.rk-landing-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--lp-ink);
  text-decoration: none;
  flex: 0 0 auto;
}

.rk-landing-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.rk-landing-brand__wordmark {
  display: block;
  width: 92px;
  height: auto;
  object-fit: contain;
}

.rk-landing-brand__wordmark--cn {
  width: 54px;
}

.rk-landing-brand__wordmark[src*="logo_wordmark_en"] {
  width: 104px;
}

.rk-landing-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex: 1 1 auto;
  justify-content: flex-end;
  min-width: 0;
}

.rk-landing-nav__link {
  display: inline-flex;
  align-items: center;
  position: relative;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-sm);
  font-weight: 500;
  line-height: var(--lp-lh-snug);
  min-height: 36px;
  padding: 0 4px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.rk-landing-nav__link::after {
  content: "";
  position: absolute;
  left: 4px; right: 4px; bottom: 6px;
  height: 2px;
  background: var(--lp-grad-cyan);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.15s ease;
}
.rk-landing-nav__link:hover { color: var(--lp-ink); }
.rk-landing-nav__link:hover::after { transform: scaleX(1); }

.rk-landing-nav__divider {
  width: 1px;
  height: 18px;
  background: var(--lp-line-strong);
  margin: 0 2px;
}

.rk-btn--compact {
  min-height: 38px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: var(--lp-fs-sm);
  font-weight: 600;
  white-space: nowrap;
}

/* =========================
   Language dropdown
   ========================= */
.rk-landing-lang {
  position: relative;
}
.rk-landing-lang__toggle {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--lp-line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--lp-ink);
  font-size: var(--lp-fs-sm);
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.rk-landing-lang__toggle::-webkit-details-marker { display: none; }
.rk-landing-lang__toggle::marker { content: ""; }
.rk-landing-lang__toggle:hover {
  border-color: var(--lp-cyan-deep);
  background: #fff;
}
.rk-landing-lang__icon {
  display: inline-flex;
  width: 16px;
  height: 16px;
  color: var(--lp-ink-soft);
}
.rk-landing-lang__icon svg { width: 100%; height: 100%; }
.rk-landing-lang__chevron {
  font-size: 10px;
  color: var(--lp-ink-muted);
  transition: transform 0.15s ease;
}
.rk-landing-lang[open] .rk-landing-lang__chevron { transform: rotate(180deg); }

.rk-landing-lang__menu {
  list-style: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 160px;
  margin: 0;
  padding: 6px;
  background: #fff;
  border: 1px solid var(--lp-line-strong);
  border-radius: 12px;
  box-shadow: 0 14px 40px rgba(10, 21, 37, 0.16);
  z-index: 100;
}
.rk-landing-lang__opt {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--lp-ink);
  font-size: var(--lp-fs-sm);
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background 0.12s ease;
}
.rk-landing-lang__opt:hover { background: rgba(77, 208, 225, 0.10); }
.rk-landing-lang__opt.is-active {
  color: var(--lp-cyan-deep);
  font-weight: 600;
  background: rgba(77, 208, 225, 0.08);
}
.rk-landing-lang__opt.is-active::before {
  content: "✓";
  margin-right: 2px;
  color: var(--lp-cyan-deep);
}
.rk-landing-lang__opt:not(.is-active)::before {
  content: "";
  width: 12px;
  display: inline-block;
}

/* =========================
   Hero
   ========================= */
.rk-landing-main { flex: 1; width: 100%; }

.rk-main-content:has(.rk-landing-page) {
  line-height: 1.65;
}

.rk-landing-hero {
  position: relative;
  min-height: min(760px, 88vh);
  display: flex;
  align-items: center;
  padding: 124px clamp(24px, 6vw, 96px) 84px;
  overflow: hidden;
  color: var(--lp-ink);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.86) 34%, rgba(255, 255, 255, 0.24) 66%, rgba(255, 255, 255, 0.08) 100%),
    url("./landing/hero-default-workspace.png") center right / cover no-repeat,
    linear-gradient(112deg, #ffffff 0%, #f4f9ff 48%, #eaf8fb 100%);
  border-bottom: 1px solid var(--lp-line);
}

.rk-landing-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 42%, rgba(255, 255, 255, 0.82), transparent 34%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.78) 0%, rgba(255, 255, 255, 0.62) 40%, rgba(255, 255, 255, 0.16) 100%);
  pointer-events: none;
}

.rk-landing-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 74%, rgba(246, 248, 251, 0.92) 100%);
  pointer-events: none;
}

.rk-landing-page--cn .rk-landing-hero {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.84) 34%, rgba(255, 255, 255, 0.26) 64%, rgba(255, 255, 255, 0.08) 100%),
    url("./landing/hero-cn-luke.png") center right / cover no-repeat,
    linear-gradient(112deg, #ffffff 0%, #f4f9ff 48%, #eaf8fb 100%);
}

.rk-landing-page--cn .rk-landing-hero::before {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.86) 0%, rgba(255, 255, 255, 0.68) 36%, rgba(255, 255, 255, 0.12) 70%, transparent 100%),
    radial-gradient(circle at 28% 42%, rgba(255, 255, 255, 0.82), transparent 32%);
}

.rk-landing-page--cn .rk-landing-hero::after {
  display: block;
}

.rk-landing-hero__content {
  position: relative;
  z-index: 1;
  width: min(680px, 100%);
  animation: rk-fade-in-up 0.5s ease both;
}

.rk-landing-page--cn .rk-landing-hero__content {
  width: min(620px, 48vw);
}

.rk-landing-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--lp-line-strong);
  color: var(--lp-cyan-deep);
  font-size: var(--lp-fs-sm);
  font-weight: 600;
  line-height: 1.4;
  box-shadow: var(--lp-shadow-soft);
}
.rk-landing-kicker__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--lp-grad-cyan);
  box-shadow: 0 0 0 4px rgba(77, 208, 225, 0.25);
  animation: rk-pulse-dot 2.2s ease-in-out infinite;
}

.rk-landing-hero-title {
  margin: 0;
  color: var(--lp-ink);
  font-size: var(--lp-fs-h1);
  font-weight: 800;
  line-height: var(--lp-lh-tight);
  letter-spacing: 0;
}
.rk-landing-hero-title__line {
  display: block;
}
.rk-landing-hero-title__accent {
  background: var(--lp-grad-text);
  background-size: 200% 100%;
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  animation: rk-shimmer 8s linear infinite;
}

.rk-landing-hero-text {
  width: min(620px, 100%);
  margin: 22px 0 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-lead);
  line-height: var(--lp-lh-relaxed);
}

.rk-landing-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.rk-landing-proof span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(0, 132, 255, 0.18);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.86);
  color: rgba(10, 21, 37, 0.76);
  font-size: var(--lp-fs-sm);
  font-weight: 650;
  line-height: 1.35;
  box-shadow: 0 8px 20px rgba(0, 132, 255, 0.06);
}

.rk-landing-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 32px;
}

.rk-btn--large {
  min-height: 48px;
  min-width: 148px;
  padding: 0 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.rk-landing-cta .rk-btn-primary,
.rk-btn-primary.rk-btn--large {
  position: relative;
  background: var(--lp-grad-cyan) !important;
  border: 0 !important;
  color: #ffffff !important;
  box-shadow: var(--lp-shadow-glow);
  overflow: hidden;
  isolation: isolate;
}
.rk-landing-cta .rk-btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.50) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.7s ease;
  z-index: -1;
}
.rk-landing-cta .rk-btn-primary:hover::before { transform: translateX(120%); }
.rk-landing-cta .rk-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 22px 50px rgba(77, 208, 225, 0.40),
              0 10px 24px rgba(10, 21, 37, 0.20);
}

.rk-landing-cta .rk-btn-secondary {
  background: rgba(255, 255, 255, 0.92) !important;
  border: 1px solid var(--lp-line-strong) !important;
  color: var(--lp-ink) !important;
}
.rk-landing-cta .rk-btn-secondary:hover {
  border-color: var(--lp-cyan-deep) !important;
  color: var(--lp-cyan-deep) !important;
}

/* =========================
   Trust strip
   ========================= */
.rk-landing-trust {
  width: min(1180px, calc(100% - 40px));
  margin: clamp(30px, 4vw, 52px) auto 0;
}
.rk-landing-trust__inner {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: 24px clamp(20px, 3vw, 36px);
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--lp-line-strong);
  box-shadow: var(--lp-shadow-card);
}
.rk-landing-trust__item {
  margin: 0;
  padding: 6px clamp(14px, 2vw, 24px);
  border-left: 1px solid var(--lp-line);
  color: var(--lp-ink);
  font-size: var(--lp-fs-body);
  font-weight: 500;
  line-height: var(--lp-lh-normal);
}
.rk-landing-trust__item:first-child { border-left: 0; padding-left: 0; }
.rk-landing-trust__item:last-child { padding-right: 0; }
.rk-landing-trust__label {
  display: block;
  margin-bottom: 4px;
  color: var(--lp-cyan-deep);
  font-size: var(--lp-fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.10em;
  line-height: 1.4;
  text-transform: uppercase;
}

/* =========================
   Sections shared
   ========================= */
.rk-landing-problem,
.rk-landing-workspace,
.rk-landing-features,
.rk-landing-how,
.rk-landing-operations,
.rk-landing-usecases,
.rk-landing-principles,
.rk-landing-faq {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(64px, 8vw, 96px) 0;
  animation: rk-fade-in-up 0.45s ease 0.1s both;
}

.rk-landing-problem {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}
.rk-landing-problem__copy {
  position: sticky;
  top: 96px;
}
.rk-landing-problem__grid {
  display: grid;
  gap: 14px;
}
.rk-landing-problem__grid article {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 6px 18px;
  padding: 24px;
  border: 1px solid var(--lp-line-strong);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--lp-shadow-soft);
}
.rk-landing-problem__grid span {
  grid-row: span 2;
  color: var(--lp-cyan-deep);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
}
.rk-landing-problem__grid h3 {
  margin: 0;
  color: var(--lp-ink);
  font-size: var(--lp-fs-h3);
  line-height: var(--lp-lh-snug);
}
.rk-landing-problem__grid p {
  margin: 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-relaxed);
}

.rk-landing-eyebrow {
  margin: 0 0 10px;
  font-size: var(--lp-fs-eyebrow);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--lp-grad-cyan);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}

.rk-landing-section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  align-items: end;
  gap: 16px clamp(24px, 4vw, 56px);
  margin-bottom: clamp(32px, 4vw, 48px);
}
.rk-landing-section-heading--center {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.rk-landing-section-title {
  margin: 0;
  color: var(--lp-ink);
  font-size: var(--lp-fs-h2);
  font-weight: 700;
  line-height: var(--lp-lh-snug);
  letter-spacing: -0.01em;
}

.rk-landing-section-subtitle {
  max-width: 460px;
  margin: 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-relaxed);
}

.rk-landing-section-note {
  margin: 18px 0 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-relaxed);
}

/* =========================
   Workspace preview
   ========================= */
.rk-landing-workspace {
  padding-top: clamp(56px, 7vw, 84px);
}

.rk-landing-workspace__body {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(420px, 1.18fr);
  gap: clamp(20px, 4vw, 44px);
  align-items: center;
}

.rk-landing-workspace__notes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.rk-landing-workspace__notes article {
  padding: 20px;
  border: 1px solid var(--lp-line-strong);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--lp-shadow-soft);
}

.rk-landing-workspace__notes strong {
  display: block;
  margin-bottom: 6px;
  color: var(--lp-ink);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-snug);
}

.rk-landing-workspace__notes p {
  margin: 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-sm);
  line-height: var(--lp-lh-normal);
}

.rk-landing-workspace__preview {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--lp-line-strong);
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.78)),
    linear-gradient(135deg, rgba(77, 208, 225, 0.22), rgba(74, 123, 209, 0.18));
  box-shadow: var(--lp-shadow-card);
}

.rk-landing-workspace__preview img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(10, 21, 37, 0.10);
  border-radius: 10px;
  box-shadow: 0 18px 48px rgba(10, 21, 37, 0.12);
}

/* =========================
   Feature grid
   ========================= */
.rk-landing-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.rk-landing-feature-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px;
  background: var(--lp-surface);
  border: 1px solid var(--lp-line-strong);
  border-radius: 12px;
  box-shadow: var(--lp-shadow-soft);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
  overflow: hidden;
}
.rk-landing-feature-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--lp-grad-cyan);
  opacity: 0;
  transition: opacity 0.18s ease;
}
.rk-landing-feature-card:hover {
  transform: translateY(-3px);
  border-color: rgba(77, 208, 225, 0.55);
  box-shadow: var(--lp-shadow-card);
}
.rk-landing-feature-card:hover::before {
  opacity: 1;
}

.rk-landing-feature-icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border-radius: 12px;
  background: var(--lp-grad-cyan);
  color: #fff;
  box-shadow: 0 10px 20px rgba(77, 208, 225, 0.26);
  flex: 0 0 auto;
}
.rk-landing-feature-icon svg { width: 24px; height: 24px; }

.rk-landing-feature-card:nth-child(1) .rk-landing-feature-icon { background: linear-gradient(135deg, #4dd0e1, #0aa6c2); }
.rk-landing-feature-card:nth-child(2) .rk-landing-feature-icon { background: linear-gradient(135deg, #5bb8d9, #4a7bd1); }
.rk-landing-feature-card:nth-child(3) .rk-landing-feature-icon { background: linear-gradient(135deg, #9fdfeb, #4dd0e1); color: #0a1525; }
.rk-landing-feature-card:nth-child(4) .rk-landing-feature-icon { background: linear-gradient(135deg, #4a7bd1, #14253f); }
.rk-landing-feature-card:nth-child(5) .rk-landing-feature-icon { background: linear-gradient(135deg, #0aa6c2, #14253f); }
.rk-landing-feature-card:nth-child(6) .rk-landing-feature-icon { background: linear-gradient(135deg, #14253f, #4a7bd1); }

.rk-landing-feature-title {
  margin: 0 0 10px;
  color: var(--lp-ink);
  font-size: var(--lp-fs-h3);
  font-weight: 700;
  line-height: var(--lp-lh-snug);
}

.rk-landing-feature-text {
  margin: 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-relaxed);
}

/* =========================
   How it works (steps)
   ========================= */
.rk-landing-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.rk-landing-step {
  display: flex;
  flex-direction: column;
  padding: 32px;
  border-radius: 12px;
  background: var(--lp-surface);
  border: 1px solid var(--lp-line-strong);
  box-shadow: var(--lp-shadow-soft);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.rk-landing-step:hover {
  transform: translateY(-3px);
  box-shadow: var(--lp-shadow-card);
}
.rk-landing-step__num {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
  background: var(--lp-grad-cyan);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  letter-spacing: -0.03em;
}
.rk-landing-step__title {
  margin: 0 0 10px;
  color: var(--lp-ink);
  font-size: var(--lp-fs-h3);
  font-weight: 700;
  line-height: var(--lp-lh-snug);
}
.rk-landing-step__text {
  margin: 0;
  color: var(--lp-ink-soft);
  font-size: var(--lp-fs-body);
  line-height: var(--lp-lh-relaxed);
}

/* =========================
   Operations, use cases, FAQ
   ========================= */
.rk-landing-operations {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}

.rk-landing-operations__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.rk-landing-operations__grid article,
.rk-landing-usecase-grid article {
  padding: 24px;
  border: 1px solid var(--lp-line-strong);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--lp-shadow-soft);
}

.rk-landing-operations__grid span {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--lp-cyan-deep);
  font-size: var(--lp-fs-eyebrow);
  font-weight: 800;
  letter-spacing: 0.10em;
  text-transform: uppercase;
}

.rk-landing-operations__grid strong,
.rk-landing-usecase-grid h3 {
  display: block;
  margin: 0 0 6px;
  color: var(--lp-ink);
  font-size: var(--lp-fs-h3);
  line-height: var(--lp-lh-snug);
}

.rk-landing-operations__grid p,
.rk-landing-usecase-grid p {
  margin: 0;
  color: var(--lp-ink-soft);
  line-height: var(--lp-lh-relaxed);
}

.rk-landing-usecase-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.rk-landing-usecase-grid article {
  min-height: 184px;
}

.rk-landing-principles__panel {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(32px, 5vw, 56px);
  border-radius: 16px;
  background:
    radial-gradient(700px 380px at 100% 0%, rgba(77, 208, 225, 0.20), transparent 60%),
    #fff;
  border: 1px solid var(--lp-line-strong);
  box-shadow: var(--lp-shadow-card);
}

.rk-landing-principles__list {
  display: grid;
  gap: 12px;
}

.rk-landing-principles__list p {
  margin: 0;
  padding: 16px 18px;
  border-radius: 10px;
  background: rgba(246, 248, 251, 0.92);
  border: 1px solid var(--lp-line);
  color: var(--lp-ink-soft);
}

.rk-landing-faq__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto;
}

.rk-landing-faq__item {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 8px;
  min-height: 142px;
  padding: 24px;
  border: 1px solid rgba(10, 21, 37, 0.10);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--lp-shadow-soft);
}

.rk-landing-faq__item::before {
  content: "Q";
  grid-row: 1 / span 2;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
  border-radius: 10px;
  background: rgba(77, 208, 225, 0.13);
  color: var(--lp-cyan-deep);
  font-size: 13px;
  font-weight: 900;
  line-height: 1;
}

.rk-landing-faq__item h3 {
  margin: 0 0 10px;
  color: var(--lp-ink);
  font-size: 17px;
  font-weight: 800;
  line-height: var(--lp-lh-snug);
}

.rk-landing-faq__item p {
  margin: 0;
  color: var(--lp-ink-soft);
  font-size: 14.5px;
  line-height: var(--lp-lh-relaxed);
}

/* =========================
   Final CTA
   ========================= */
.rk-landing-finalcta {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto clamp(56px, 7vw, 88px);
  padding: clamp(48px, 7vw, 80px) clamp(28px, 5vw, 64px);
  border-radius: 16px;
  background:
    radial-gradient(700px 380px at 100% 0%, rgba(77, 208, 225, 0.30), transparent 60%),
    radial-gradient(600px 380px at 0% 100%, rgba(74, 123, 209, 0.26), transparent 60%),
    var(--lp-grad-deep);
  color: #f4f7fb;
  text-align: center;
  box-shadow: 0 28px 70px rgba(10, 21, 37, 0.28);
  position: relative;
  overflow: hidden;
}
.rk-landing-finalcta__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.rk-landing-finalcta__title {
  margin: 0;
  color: #ffffff;
  font-size: var(--lp-fs-h2);
  font-weight: 800;
  line-height: var(--lp-lh-snug);
  letter-spacing: -0.01em;
}
.rk-landing-finalcta__text {
  max-width: 520px;
  margin: 0;
  color: rgba(244, 247, 251, 0.76);
  font-size: var(--lp-fs-lead);
  line-height: var(--lp-lh-relaxed);
}
.rk-landing-finalcta .rk-landing-cta {
  justify-content: center;
  margin-top: 8px;
}

/* =========================
   Footer
   ========================= */
.rk-landing-footer {
  padding: clamp(40px, 5vw, 56px) clamp(20px, 5vw, 64px) 24px;
  background: var(--lp-navy);
  color: rgba(244, 247, 251, 0.70);
}
.rk-landing-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(244, 247, 251, 0.10);
}
.rk-landing-footer__brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}
.rk-landing-footer__name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--lp-grad-text);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.rk-landing-footer__tag {
  margin: 0;
  color: rgba(244, 247, 251, 0.62);
  font-size: var(--lp-fs-sm);
  line-height: var(--lp-lh-normal);
}
.rk-landing-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.rk-landing-footer__links a {
  color: rgba(244, 247, 251, 0.76);
  text-decoration: none;
  font-size: var(--lp-fs-sm);
  line-height: 1.5;
  transition: color 0.15s ease;
}
.rk-landing-footer__links a:hover { color: var(--lp-cyan); }

.rk-landing-footer-text {
  max-width: 1180px;
  margin: 20px auto 0;
  color: rgba(244, 247, 251, 0.45);
  font-size: var(--lp-fs-sm);
  line-height: 1.5;
  text-align: center;
}

/* =========================
   Responsive
   ========================= */
@media (max-width: 1000px) {
  .rk-landing-section-heading,
  .rk-landing-problem,
  .rk-landing-workspace__body,
  .rk-landing-operations,
  .rk-landing-principles__panel {
    grid-template-columns: 1fr;
  }
  .rk-landing-workspace__preview { max-width: 760px; }
  .rk-landing-problem__copy {
    position: static;
  }
  .rk-landing-feature-grid,
  .rk-landing-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .rk-landing-trust__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 0;
    padding: 18px 20px;
  }
  .rk-landing-trust__item {
    border-left: 0;
    padding: 10px 14px;
  }
  .rk-landing-trust__item:first-child { padding-left: 14px; }
  .rk-landing-trust__item:last-child { padding-right: 14px; }
}

@media (max-width: 1080px) {
  .rk-landing-usecase-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .rk-landing-nav__link:nth-of-type(1),
  .rk-landing-nav__link:nth-of-type(2),
  .rk-landing-nav__link:nth-of-type(3),
  .rk-landing-nav__link:nth-of-type(4),
  .rk-landing-nav__divider { display: none; }

  .rk-landing-hero {
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.80) 54%, rgba(255, 255, 255, 0.48) 100%),
      url("./landing/hero-default-workspace.png") 62% center / cover no-repeat,
      linear-gradient(180deg, #ffffff 0%, #eef7ff 100%);
  }
  .rk-landing-page--cn .rk-landing-hero {
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.92) 0%, rgba(255, 255, 255, 0.72) 52%, rgba(255, 255, 255, 0.38) 100%),
      url("./landing/hero-cn-luke.png") 62% center / cover no-repeat,
      linear-gradient(180deg, #ffffff 0%, #eef7ff 100%);
  }
  .rk-landing-page--cn .rk-landing-hero__content {
    width: min(620px, 100%);
  }
  .rk-landing-hero::after { display: none; }
}

@media (max-width: 640px) {
  .rk-main-content:has(.rk-landing-page) {
    line-height: 1.55;
  }

  .rk-landing-page {
    --lp-fs-h1: clamp(34px, 10vw, 44px);
    --lp-fs-h2: 24px;
    --lp-fs-h3: 16px;
    --lp-fs-lead: 15px;
    --lp-fs-body: 14px;
    --lp-lh-relaxed: 1.55;
  }
  .rk-landing-header { padding: 0 16px; }
  .rk-landing-logo { width: 28px; height: 28px; }
  .rk-landing-brand__wordmark { width: 82px; }
  .rk-landing-brand__wordmark[src*="logo_wordmark_en"] { width: 92px; }
  .rk-landing-brand__wordmark--cn { width: 48px; }
  .rk-landing-nav {
    gap: 10px;
    flex: 0 1 auto;
  }
  .rk-landing-nav__link:nth-of-type(3),
  .rk-landing-nav__link:nth-of-type(4) {
    display: none;
  }
  .rk-btn--compact {
    min-height: 36px;
    padding: 0 14px;
  }

  .rk-landing-lang__current { display: none; }
  .rk-landing-lang__toggle {
    width: 36px;
    padding: 0;
    justify-content: center;
  }
  .rk-landing-lang__chevron { display: none; }

  .rk-landing-hero {
    min-height: min(640px, 82vh);
    align-items: flex-start;
    padding: 84px 16px 38px;
    background-position: 60% center;
  }
  .rk-landing-page--cn .rk-landing-hero {
    background-position: 60% center;
  }
  .rk-landing-kicker {
    margin-bottom: 14px;
    padding: 5px 10px;
  }
  .rk-landing-hero-text {
    margin-top: 16px;
    width: min(100%, 34em);
  }
  .rk-landing-proof {
    gap: 6px;
    margin-top: 16px;
  }
  .rk-landing-proof span {
    min-height: 30px;
    padding: 0 10px;
  }
  .rk-landing-cta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    align-items: stretch;
    margin-top: 18px;
  }
  .rk-landing-cta .rk-btn {
    width: auto;
    min-width: 0;
    min-height: 42px;
    padding: 0 12px;
    justify-content: center;
  }

  .rk-landing-trust {
    width: calc(100% - 32px);
    margin-top: 24px;
  }
  .rk-landing-trust__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    padding: 8px;
    border-radius: 10px;
  }
  .rk-landing-trust__item {
    min-height: 74px;
    padding: 10px;
    border-left: 0;
    border-top: 1px solid var(--lp-line);
  }
  .rk-landing-trust__item:first-child,
  .rk-landing-trust__item:nth-child(2) {
    border-top: 0;
  }
  .rk-landing-trust__item:nth-child(2n) {
    border-left: 1px solid var(--lp-line);
  }
  .rk-landing-trust__item:first-child,
  .rk-landing-trust__item:last-child {
    padding: 10px;
  }
  .rk-landing-trust__label {
    margin-bottom: 3px;
    letter-spacing: 0.06em;
  }

  .rk-landing-problem,
  .rk-landing-workspace,
  .rk-landing-features,
  .rk-landing-how,
  .rk-landing-operations,
  .rk-landing-usecases,
  .rk-landing-principles,
  .rk-landing-faq {
    width: calc(100% - 32px);
    padding: 46px 0;
  }
  .rk-landing-problem {
    gap: 18px;
  }
  .rk-landing-section-heading {
    margin-bottom: 20px;
  }
  .rk-landing-problem__grid article {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 5px 12px;
    padding: 16px;
    border-radius: 10px;
  }
  .rk-landing-problem__grid span {
    grid-row: span 2;
    font-size: 20px;
  }

  .rk-landing-feature-grid,
  .rk-landing-steps,
  .rk-landing-operations__grid,
  .rk-landing-usecase-grid,
  .rk-landing-faq__list { grid-template-columns: 1fr; }
  .rk-landing-feature-grid,
  .rk-landing-steps {
    gap: 12px;
  }
  .rk-landing-feature-card,
  .rk-landing-step {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 4px 12px;
    padding: 16px;
    border-radius: 10px;
  }
  .rk-landing-feature-icon {
    grid-row: span 2;
    width: 40px;
    height: 40px;
    margin-bottom: 0;
    border-radius: 10px;
  }
  .rk-landing-feature-icon svg {
    width: 21px;
    height: 21px;
  }
  .rk-landing-feature-title,
  .rk-landing-step__title {
    margin-bottom: 2px;
  }
  .rk-landing-step__num {
    grid-row: span 2;
    margin-bottom: 0;
    font-size: 22px;
  }
  .rk-landing-workspace__preview {
    padding: 8px;
    border-radius: 10px;
  }
  .rk-landing-principles__panel,
  .rk-landing-operations__grid article,
  .rk-landing-usecase-grid article,
  .rk-landing-faq__item {
    padding: 16px;
    border-radius: 10px;
  }
  .rk-landing-faq__item {
    grid-template-columns: 1fr;
  }
  .rk-landing-faq__item::before {
    display: none;
  }
  .rk-landing-finalcta {
    width: calc(100% - 32px);
    margin-bottom: 48px;
    padding: 34px 18px;
    border-radius: 12px;
  }
  .rk-landing-finalcta .rk-landing-cta {
    grid-template-columns: 1fr;
    width: 100%;
  }

  .rk-landing-footer__inner { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  .rk-landing-hero-title__accent,
  .rk-landing-kicker__dot { animation: none !important; }
}