:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--tt-bg, #f5f7fb);
  color: var(--tt-text, #172033);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--tt-bg, #f5f7fb);
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.tool-card {
  background: var(--tt-surface, #ffffff);
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  box-shadow: 0 16px 40px rgba(23, 32, 51, 0.08);
  padding: 28px;
}

.tool-header {
  margin-bottom: 22px;
}

.eyebrow {
  color: var(--tt-primary, #2563eb);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0 0 8px;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1 {
  color: var(--tt-text, #172033);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  margin: 0 0 10px;
}

.intro,
.help-text {
  color: var(--tt-muted, #5d6b82);
  margin: 0;
}

.counter-form {
  display: grid;
  gap: 12px;
}

label {
  color: var(--tt-text, #172033);
  font-weight: 700;
}

textarea {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  padding: 16px;
  color: var(--tt-text, #172033);
  background: var(--tt-surface, #ffffff);
  font: inherit;
  line-height: 1.55;
}

textarea:focus {
  outline: 3px solid rgba(37, 99, 235, 0.2);
  border-color: var(--tt-primary, #2563eb);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

button {
  border: 0;
  border-radius: var(--tt-radius, 12px);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 12px 18px;
}

#convert {
  background: var(--tt-primary, #2563eb);
  color: var(--tt-surface, #ffffff);
}

#convert:hover,
#convert:focus-visible {
  background: var(--tt-primary-dark, #1d4ed8);
}

#clear {
  background: var(--tt-bg, #f5f7fb);
  color: var(--tt-text, #172033);
  border: 1px solid var(--tt-line, #d9e1ef);
}

.error-message {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--tt-radius, 12px);
  border: 1px solid var(--tt-danger, #b42318);
  background: rgba(180, 35, 24, 0.08);
  color: var(--tt-danger, #b42318);
  font-weight: 700;
}

.results-card {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.results-card[hidden] {
  display: none;
}

.metric {
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  background: var(--tt-bg, #f5f7fb);
  padding: 16px;
}

.metric-label {
  display: block;
  color: var(--tt-muted, #5d6b82);
  font-size: 0.92rem;
  margin-bottom: 8px;
}

output {
  color: var(--tt-text, #172033);
  display: block;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  font-weight: 800;
}

.content-slot {
  margin-top: 28px;
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 16px;
  }

  .tool-card {
    padding: 20px;
  }

  .results-card {
    grid-template-columns: 1fr;
  }
}