.seq-platform-landing {
  position: relative;
  max-width: 1180px;
  min-height: calc(100vh - 48px);
  margin: 28px auto 48px;
  padding: 0 20px 72px;
  box-sizing: border-box;
}

.seq-platform-landing-corner-logo {
  position: fixed;
  top: 18px;
  left: 20px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  opacity: 0.72;
  transition: opacity 160ms ease;
  text-decoration: none;
}

.seq-platform-landing-corner-logo:hover,
.seq-platform-landing-corner-logo:focus {
  opacity: 0.95;
  outline: none;
}

.seq-platform-landing-corner-logo img {
  display: block;
  width: min(148px, 34vw);
  height: auto;
  max-height: 44px;
  object-fit: contain;
}

.seq-platform-landing-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  margin-bottom: 28px;
  padding: 8px 8px 0;
}

.seq-platform-landing-hero h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2.8vw, 1.85rem);
  color: var(--app-text, #102d35);
}

.seq-platform-landing-hero .seq-landing-greeting {
  margin: 0;
  max-width: 36rem;
  color: var(--app-text-secondary, #354f58);
  font-size: 1.02rem;
  line-height: 1.45;
}

.seq-platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 340px));
  gap: 22px;
  justify-content: center;
  align-items: stretch;
  margin: 0 0 28px;
}

.seq-platform-tile.seq-platform-entry-btn,
.seq-platform-tile.seq-platform-placeholder-tile {
  width: 100% !important;
  min-height: 100%;
  padding: 0 !important;
  border: 1px solid var(--app-border-soft, #d7e0e3) !important;
  border-radius: 16px !important;
  background: var(--app-surface, #ffffff) !important;
  box-shadow: 0 8px 24px rgba(16, 45, 53, 0.06);
  color: var(--app-text, #102d35) !important;
  text-align: center;
}

.seq-platform-tile.seq-platform-entry-btn {
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

.seq-platform-tile.seq-platform-entry-btn:hover,
.seq-platform-tile.seq-platform-entry-btn:focus {
  transform: translateY(-3px);
  border-color: rgba(7, 85, 79, 0.28) !important;
  box-shadow: 0 14px 30px rgba(16, 45, 53, 0.10);
  outline: none;
  background: var(--app-surface, #ffffff) !important;
}

.seq-platform-tile.seq-platform-placeholder-tile {
  background: linear-gradient(
    180deg,
    #f7f9fb 0%,
    #eef3f4 100%
  ) !important;
  border-style: dashed !important;
  box-shadow: none;
  pointer-events: none;
  user-select: none;
  opacity: 0.78;
}

.seq-platform-entry-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 28px 24px 24px;
  text-align: center;
  height: 100%;
  box-sizing: border-box;
}

.seq-platform-placeholder-inner {
  gap: 14px;
}

.seq-platform-entry-logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: min(180px, 46vw);
  height: min(180px, 46vw);
  border-radius: 50%;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 6px 18px rgba(16, 45, 53, 0.08);
}

.seq-platform-placeholder-mark {
  background: rgba(7, 85, 79, 0.05);
  border: 1px dashed rgba(7, 85, 79, 0.28);
  box-shadow: none;
}

.seq-platform-placeholder-plus {
  color: rgba(7, 85, 79, 0.45);
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  font-weight: 300;
  line-height: 1;
}

.seq-platform-placeholder-badge {
  display: inline-block;
  margin-top: auto;
  color: var(--app-text-muted, #566c74);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.seq-platform-landing-logo {
  width: 100%;
  height: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  display: block;
  border-radius: 50%;
  transition: transform 180ms ease;
}

.seq-platform-tile.seq-platform-entry-btn:hover .seq-platform-landing-logo,
.seq-platform-tile.seq-platform-entry-btn:focus .seq-platform-landing-logo {
  transform: scale(1.03);
}

.seq-platform-placeholder-tile .seq-platform-landing-tagline-title {
  font-size: clamp(1.25rem, 3vw, 1.55rem);
  color: var(--app-text-secondary, #354f58);
}

.seq-platform-placeholder-tile .seq-platform-landing-tagline-sub {
  font-size: clamp(0.92rem, 2.2vw, 1.05rem);
}

.seq-platform-landing-tagline {
  margin: 0;
  max-width: 22rem;
  width: 100%;
  color: var(--app-text, #102d35);
  font-size: clamp(1.05rem, 2.4vw, 1.28rem);
  font-weight: 650;
  letter-spacing: 0.01em;
  line-height: 1.35;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.seq-platform-landing-tagline-title {
  display: block;
  font-size: clamp(1.75rem, 4.2vw, 2.35rem);
  font-weight: 750;
  letter-spacing: 0.01em;
  line-height: 1.15;
}

.seq-platform-landing-tagline-sub {
  display: block;
  font-size: clamp(1.12rem, 2.8vw, 1.35rem);
  font-weight: 500;
  color: var(--app-text-secondary, #354f58);
  line-height: 1.35;
}

.seq-platform-landing-logo-credit {
  margin: 2px 0 0;
  color: var(--app-text-muted, #566c74);
  font-size: 0.68rem;
  font-style: italic;
  font-weight: 400;
  line-height: 1.3;
  text-align: center;
  opacity: 0.48;
}

.seq-platform-landing-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 28px;
}

.seq-platform-landing-meta {
  position: fixed;
  left: 20px;
  bottom: 16px;
  z-index: 20;
  margin: 0;
  max-width: min(420px, calc(100vw - 140px));
  color: var(--app-text-secondary, #354f58);
  font-size: 0.78rem;
  line-height: 1.35;
  opacity: 0.78;
  pointer-events: none;
}

@media (max-width: 640px) {
  .seq-platform-landing {
    margin-top: 56px;
    padding-bottom: 88px;
  }

  .seq-platform-landing-corner-logo {
    top: 12px;
    left: 12px;
  }

  .seq-platform-landing-corner-logo img {
    width: min(118px, 42vw);
    max-height: 36px;
  }

  .seq-platform-entry-logo-wrap {
    width: min(150px, 48vw);
    height: min(150px, 48vw);
  }

  .seq-platform-landing-tagline {
    max-width: 16rem;
    font-size: 1.02rem;
  }

  .seq-platform-landing-meta {
    left: 12px;
    bottom: 12px;
    font-size: 0.72rem;
  }
}