/* Landing visual system for www.liuhetong888.com.
   Clean, tech-forward direction: generous whitespace, 12-column feel via
   grid templates, card surfaces, soft shadows, restrained motion. */

.land-page {
  min-height: 100vh;
  background: var(--admin-page);
  color: var(--admin-ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

.land-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Top navigation ------------------------------------------------- */
.land-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-navigation);
  background: color-mix(in srgb, var(--admin-surface) 86%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--admin-border);
}

.land-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
}

.land-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--admin-ink);
  text-decoration: none;
}

.land-logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: var(--color-brand-primary);
  color: var(--color-on-accent);
  font-size: 15px;
  font-weight: 800;
}

.land-nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.land-nav-links a {
  color: var(--admin-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--motion-page) ease;
}

.land-nav-links a:hover {
  color: var(--admin-ink);
}

.land-nav .land-btn {
  min-height: 38px;
  padding: 8px 16px;
}

/* --- Buttons --------------------------------------------------------- */
.land-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform var(--motion-press-in) ease,
    box-shadow var(--motion-page) ease,
    background var(--motion-page) ease,
    border-color var(--motion-page) ease;
}

.land-btn-primary {
  background: var(--color-brand-primary);
  color: var(--color-on-accent);
  box-shadow: var(--admin-shadow);
}

.land-btn-primary:hover {
  background: var(--color-brand-pressed);
  transform: translateY(-1px);
  box-shadow: var(--land-shadow-lift);
}

.land-btn-ghost {
  background: transparent;
  color: var(--admin-ink);
  border-color: var(--admin-border);
}

.land-btn-ghost:hover {
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
}

.land-btn:active {
  transform: scale(var(--scale-pressed));
}

/* Disabled platform entry: grayed out, non-interactive, clearly inactive. */
.land-btn-disabled,
.land-btn-disabled:hover {
  background: var(--admin-border);
  border-color: var(--admin-border);
  color: var(--admin-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

/* --- Hero ------------------------------------------------------------ */
.land-hero {
  padding: 96px 0 88px;
}

.land-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  align-items: center;
  gap: 64px;
}

.land-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--admin-hero-glow);
  color: var(--admin-brand-strong);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.land-hero h1 {
  margin: 22px 0 18px;
  font-size: 56px;
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.land-hero-accent {
  color: var(--color-brand-primary);
}

.land-hero-copy {
  margin: 0;
  max-width: 520px;
  font-size: 19px;
  line-height: 1.65;
  color: var(--admin-muted);
}

.land-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.land-hero-note {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--admin-muted);
}

/* Abstract security visual, drawn purely with surfaces and shadows. */
.land-hero-visual {
  position: relative;
  min-height: 380px;
}

.land-visual-card {
  position: absolute;
  border-radius: 22px;
  background: var(--admin-surface);
  border: 1px solid var(--admin-border);
  box-shadow: var(--land-shadow-card);
}

.land-visual-main {
  inset: 0 12% 18% 0;
  display: grid;
  place-items: center;
  background: linear-gradient(150deg, var(--admin-hero) 0%, var(--admin-hero-accent) 100%);
  border: 0;
  color: var(--color-on-accent);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.06em;
  animation: land-rise 560ms ease both;
}

.land-visual-chip {
  right: 0;
  bottom: 0;
  padding: 16px 22px;
  display: grid;
  gap: 4px;
  animation: land-rise 560ms ease 120ms both;
}

.land-visual-chip strong {
  font-size: 22px;
  font-variant-numeric: tabular-nums;
}

.land-visual-chip span {
  font-size: 12px;
  color: var(--admin-muted);
}

.land-visual-badge {
  top: 8%;
  right: 18%;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: var(--admin-hero-glow);
  color: var(--admin-brand-strong);
  font-size: 24px;
  animation: land-rise 560ms ease 200ms both;
}

@keyframes land-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Sections -------------------------------------------------------- */
.land-section {
  padding: 72px 0;
}

.land-section-head {
  max-width: 560px;
  margin-bottom: 40px;
}

.land-kicker {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-brand-primary);
}

.land-section-head h2 {
  margin: 0;
  font-size: 36px;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.land-section-head p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--admin-muted);
}

.land-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.land-card {
  background: var(--admin-surface);
  border: 1px solid var(--admin-border);
  border-radius: 18px;
  padding: 26px;
  box-shadow: var(--land-shadow-card);
  transition:
    transform var(--motion-page) ease,
    box-shadow var(--motion-page) ease;
}

.land-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--land-shadow-lift);
}

.land-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  background: var(--admin-hero-glow);
  color: var(--admin-brand-strong);
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 16px;
}

.land-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.land-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--admin-muted);
}

/* --- Security band ---------------------------------------------------- */
.land-band {
  border-radius: 24px;
  padding: 56px 48px;
  background: linear-gradient(140deg, var(--admin-hero) 0%, var(--admin-hero-accent) 100%);
  color: var(--color-on-accent);
}

.land-band h2 {
  margin: 0;
  font-size: 32px;
  letter-spacing: -0.015em;
}

.land-band p {
  margin: 12px 0 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--admin-hero-text);
}

.land-band-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}

.land-band-card {
  border-radius: 16px;
  padding: 22px;
  background: color-mix(in srgb, var(--color-on-accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-on-accent) 16%, transparent);
}

.land-band-card strong {
  display: block;
  font-size: 24px;
  margin-bottom: 6px;
}

.land-band-card span {
  font-size: 13px;
  color: var(--admin-hero-text);
}

/* --- Download --------------------------------------------------------- */
.land-download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 32px;
  background: var(--admin-surface);
  border: 1px solid var(--admin-border);
  border-radius: 24px;
  padding: 48px;
  box-shadow: var(--land-shadow-card);
}

.land-download-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 260px;
}

.land-download-row {
  display: flex;
  align-items: stretch;
  gap: 12px;
}

.land-download-row .land-btn {
  flex: 1;
  white-space: nowrap;
}

.land-abi-select {
  min-width: 148px;
  padding: 0 34px 0 14px;
  border: 1px solid var(--admin-border);
  border-radius: 12px;
  background:
    var(--admin-surface)
    url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMCIgaGVpZ2h0PSI2IiB2aWV3Qm94PSIwIDAgMTAgNiI+PHBhdGggZD0iTTEgMWw0IDQgNC00IiBzdHJva2U9IiM3MTgwOTYiIHN0cm9rZS13aWR0aD0iMS41IiBmaWxsPSJub25lIi8+PC9zdmc+")
    no-repeat right 14px center;
  color: var(--admin-ink);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  appearance: none;
  cursor: pointer;
  transition: border-color var(--motion-page) ease;
}

.land-abi-select:hover {
  border-color: var(--color-brand-primary);
}

.land-abi-select:focus {
  outline: none;
  border-color: var(--color-brand-primary);
}

.land-abi-hint {
  margin: -6px 0 0;
  font-size: 12px;
  color: var(--admin-muted);
  overflow-wrap: anywhere;
}

.land-platform-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 600;
}

.land-platform-status {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  opacity: 0.92;
}

.land-download-note {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--admin-muted);
}

/* --- Notice ----------------------------------------------------------- */
.land-notice {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  background: var(--admin-surface);
  border: 1px solid var(--admin-border);
  border-radius: 16px;
  padding: 22px 26px;
}

.land-notice strong {
  font-size: 15px;
}

.land-notice time {
  font-size: 13px;
  color: var(--admin-muted);
  white-space: nowrap;
}

/* --- Footer ----------------------------------------------------------- */
.land-footer {
  margin-top: 40px;
  border-top: 1px solid var(--admin-border);
  padding: 36px 0 48px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--admin-muted);
  font-size: 13px;
}

.land-footer nav {
  display: flex;
  gap: 22px;
}

.land-footer a {
  color: var(--admin-muted);
  text-decoration: none;
}

.land-footer a:hover {
  color: var(--admin-ink);
}

/* --- Responsive ------------------------------------------------------- */
@media (max-width: 1023px) {
  .land-hero {
    padding: 64px 0 56px;
  }

  .land-hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .land-hero h1 {
    font-size: 42px;
  }

  .land-hero-visual {
    min-height: 300px;
  }

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

  .land-download-card {
    grid-template-columns: 1fr;
    padding: 36px;
  }
}

@media (max-width: 639px) {
  .land-nav-links {
    display: none;
  }

  .land-hero {
    padding: 48px 0;
  }

  .land-hero h1 {
    font-size: 34px;
  }

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

  .land-section-head h2 {
    font-size: 28px;
  }

  .land-grid,
  .land-band-grid {
    grid-template-columns: 1fr;
  }

  .land-band {
    padding: 36px 24px;
  }

  .land-download-card {
    padding: 28px;
  }

  .land-download-actions {
    min-width: 0;
  }

  .land-download-row {
    flex-direction: column;
    align-items: stretch;
  }

  .land-download-row .land-btn {
    width: 100%;
  }

  .land-abi-select {
    min-height: 48px;
    width: 100%;
  }

  .land-hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .land-notice {
    flex-direction: column;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .land-visual-card {
    animation: none;
  }

  .land-card,
  .land-btn {
    transition: none;
  }
}