styles.css

:root {
  --bg: #050508;
  --bg-elevated: #101019;
  --bg-elevated-soft: #151526;
  --accent: #7b5cff;
  --accent-soft: rgba(123, 92, 255, 0.18);
  --accent-strong: rgba(123, 92, 255, 0.45);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --text-primary: #f8f7ff;
  --text-muted: #a0a0c2;
  --text-softer: #7a7a9b;
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.6);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --transition-fast: 160ms ease-out;
  --transition-med: 220ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, #15152a 0, #050508 55%, #000 100%);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app-shell {
  width: 100%;
  max-width: 960px;
  margin: 1.75rem;
  padding: 1.75rem 1.75rem 1.5rem;
  border-radius: 28px;
  background:
    radial-gradient(circle at top left, rgba(123, 92, 255, 0.12), transparent 55%),
    radial-gradient(circle at bottom right, rgba(36, 198, 220, 0.1), transparent 55%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.app-title {
  font-size: clamp(1.6rem, 2.2vw, 2rem);
  letter-spacing: 0.02em;
  font-weight: 620;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.app-title::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, #7b5cff 55%, #272748 100%);
  box-shadow: 0 0 12px rgba(123, 92, 255, 0.9);
}

.app-subtitle {
  margin: 0;
  max-width: 520px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.app-main {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 1.5rem;
  align-items: stretch;
}

.card {
  background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.06), transparent 60%),
    radial-gradient(circle at bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.95));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 1.1rem 1.15rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(22px) saturate(140%);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.card-header h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 580;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-softer);
}

.card-header-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hint {
  font-size: 0.78rem;
  color: var(--text-softer);
  padding: 0.1rem 0.7rem;
  border-radius: var(--radius-pill);
  background: rgba(15, 15, 30, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.btn {
  font-size: 0.78rem;
  line-height: 1.2;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: transparent;
  color: var(--text-muted);
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(8, 8, 22, 0.9);
}

.btn-ghost:hover {
  background: var(--accent-soft);
  border-color: var(--accent-strong);
  color: var(--text-primary);
  transform: translateY(-0.5px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.75);
}

.btn-ghost:focus-visible {
  outline: none;
  border-color: var(--accent-strong);
  box-shadow:
    0 0 0 1px var(--accent-strong),
    0 0 0 1px rgba(0, 0, 0, 0.9),
    0 10px 26px rgba(10, 10, 25, 0.9);
}

.text-input {
  width: 100%;
  min-height: min(220px, 45vh);
  max-height: 60vh;
  resize: vertical;
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: radial-gradient(circle at top, rgba(255, 255, 255, 0.03), rgba(5, 5, 10, 0.96));
  color: var(--text-primary);
  font: 0.92rem/1.6 system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  outline: none;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.85);
  transition: border-color var(--transition-med),
    box-shadow var(--transition-med),
    background var(--transition-med),
    transform var(--transition-fast);
}

.text-input::placeholder {
  color: rgba(160, 160, 194, 0.7);
}

.text-input:focus-visible {
  border-color: var(--accent-strong);
  box-shadow:
    0 0 0 1px var(--accent-strong),
    0 0 0 1px rgba(0, 0, 0, 0.9),
    0 12px 32px rgba(10, 10, 25, 0.9);
  background: radial-gradient(circle at top, rgba(123, 92, 255, 0.1), rgba(5, 5, 12, 0.96));
  transform: translateY(-1px);
}

.card-metrics {
  display: flex;
  flex-direction: column; /* desktop: stack word + character vertically */
  align-items: stretch;
  gap: 0.6rem;
}

.metric {
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-md);
  background: radial-gradient(circle at top left, var(--accent-soft), rgba(10, 10, 24, 0.96));
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-height: 76px;
  flex: 1 1 0;
  transition: background var(--transition-med), border-color var(--transition-med), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.metric-secondary {
  background: radial-gradient(circle at top left, rgba(36, 198, 220, 0.08), rgba(8, 8, 22, 0.96));
}

.metric-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-softer);
}

.metric-value {
  font-variant-numeric: tabular-nums;
  font-size: 1.9rem;
  font-weight: 640;
  align-self: flex-start;
}

.metric:hover {
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.8);
}

.app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 0.3rem;
}

.footer-text {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-softer);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 640px) {
  body {
    align-items: stretch;
  }

  .app-shell {
    margin: 0.9rem;
    border-radius: 22px;
  }

  .app-main {
    grid-template-columns: minmax(0, 1fr);
  }

  .card {
    padding: 1rem;
  }

  .card-metrics {
    order: -1;             /* move metrics above text on phone */
    flex-direction: row;   /* phone: word + character side by side */
  }

  .metric {
    min-height: 68px;
  }

  .app-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}