:root {
  --ds-black: #000000;
  --ds-blue: #20a9ff;
  --ds-blue-soft: rgba(32, 169, 255, 0.55);
  --ds-silver: rgba(205, 232, 255, 0.82);
  --ds-text: #eaf6ff;
  --ds-muted: #9cb8ca;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: #000000;
  color: var(--ds-text);
  font-family: Arial, Helvetica, sans-serif;
}

body {
  min-height: 100vh;
}

.ds-page-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 26px;
  background:
    radial-gradient(circle at top, rgba(3, 28, 52, 0.92) 0%, rgba(0, 0, 0, 1) 54%),
    linear-gradient(135deg, #000000 0%, #020914 55%, #000000 100%);
}

.ds-platform-frame {
  width: min(980px, calc(100vw - 36px));
  min-height: 470px;
  position: relative;
  background: var(--ds-black);
  border: 2px solid var(--ds-blue);
  box-shadow:
    0 0 20px var(--ds-blue-soft),
    0 0 38px rgba(32, 169, 255, 0.18),
    inset 0 0 18px rgba(205, 232, 255, 0.15);
  padding: 24px;
}

.ds-platform-frame::before {
  content: "";
  position: absolute;
  inset: 24px;
  border: 1px solid var(--ds-silver);
  pointer-events: none;
}

.ds-topline {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  min-height: 54px;
  border-bottom: 1px solid rgba(32, 169, 255, 0.34);
  color: var(--ds-muted);
  font-size: 0.82rem;
}

.ds-topline-left {
  text-align: left;
}

.ds-topline-right {
  text-align: right;
}

.ds-logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.ds-light-line {
  display: block;
  width: clamp(90px, 18vw, 190px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ds-blue), var(--ds-silver));
  box-shadow: 0 0 10px var(--ds-blue-soft);
}

.ds-logo-wrap .ds-light-line:last-child {
  background: linear-gradient(90deg, var(--ds-silver), var(--ds-blue), transparent);
}

.ds-logo {
  width: 72px;
  height: auto;
  display: block;
  filter: drop-shadow(0 0 10px rgba(32, 169, 255, 0.45));
}

.ds-nav {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 8px;
  padding: 14px 0 12px;
  border-bottom: 1px solid rgba(205, 232, 255, 0.22);
}

.ds-nav-item {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 12px;
  border: 1px solid rgba(205, 232, 255, 0.34);
  color: var(--ds-muted);
  background: #02060c;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
}

.ds-nav-active {
  color: var(--ds-text);
  border-color: var(--ds-blue);
  box-shadow: 0 0 10px rgba(32, 169, 255, 0.26);
}

.ds-content-frame {
  position: relative;
  z-index: 1;
  min-height: 330px;
  margin-top: 16px;
  border: 1px solid rgba(32, 169, 255, 0.42);
  background: #000000;
  display: grid;
  place-items: center;
}

.ds-center-panel {
  text-align: center;
  padding: 32px 22px;
}

.ds-center-panel h1 {
  margin: 0 0 14px;
  letter-spacing: 0.09em;
  font-size: clamp(1.55rem, 3vw, 2rem);
}

.ds-center-panel p {
  margin: 7px 0;
  color: #c7e8ff;
}

.ds-status-line {
  margin-top: 24px;
  color: #75d7ff;
  font-size: 0.94rem;
}

@media (max-width: 720px) {
  .ds-page-shell {
    padding: 12px;
    align-items: stretch;
  }

  .ds-platform-frame {
    width: 100%;
    min-height: calc(100vh - 24px);
    padding: 16px;
  }

  .ds-platform-frame::before {
    inset: 15px;
  }

  .ds-topline {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 6px;
  }

  .ds-topline-left,
  .ds-topline-right {
    text-align: center;
  }

  .ds-light-line {
    width: 74px;
  }

  .ds-logo {
    width: 58px;
  }

  .ds-nav {
    overflow-x: auto;
  }
}