:root {
  --bg: #0d0f14;
  --surface: #171b24;
  --surface-2: #212837;
  --text: #e7edf6;
  --muted: #9bacbf;
  --accent: #7bc7ff;
  --border: #2f3b52;
  --shadow: rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top right, #141b2a 0%, var(--bg) 58%);
  color: var(--text);
  font-family: "IBM Plex Mono", "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.app {
  width: min(560px, 100%);
  min-height: 78vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
  padding: 1rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 10px 30px var(--shadow);
}

.app-header h1 {
  font-size: clamp(1rem, 3.2vw, 1.25rem);
  margin: 0;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
  align-content: start;
}

.option {
  appearance: none;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  color: var(--text);
  border-radius: 12px;
  padding: 0.85rem 0.7rem;
  min-height: 74px;
  display: grid;
  justify-items: center;
  align-content: center;
  gap: 0.45rem;
  font: inherit;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease, filter 0.12s ease;
}

.option:hover,
.option:focus-visible {
  transform: translateY(-1px);
  border-color: var(--accent);
  filter: brightness(1.08);
  outline: none;
}

.option svg {
  width: 20px;
  height: 20px;
  fill: var(--accent);
  shape-rendering: crispEdges;
}

.option span {
  font-size: 0.9rem;
  text-align: center;
}

.app-footer {
  display: flex;
  justify-content: flex-start;
}

.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 0.45rem 0.8rem;
  font: inherit;
  cursor: pointer;
}

.ghost:hover,
.ghost:focus-visible {
  color: var(--text);
  border-color: var(--accent);
  outline: none;
}

@media (max-width: 420px) {
  .app {
    min-height: 88vh;
    padding: 0.85rem;
  }

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