/**
 * Typography & Tabular Figures System
 */

/* Time Display - Tabular Numerals Ensure Jitter-Free Countdowns */
.time-display {
  font-family: var(--font-serif);
  font-size: clamp(3.75rem, 15vw, 7.5rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums lining-nums;
  -webkit-font-feature-settings: "tnum" 1, "lnum" 1;
  font-feature-settings: "tnum" 1, "lnum" 1;
  color: var(--color-text);
  display: flex;
  align-items: baseline;
  justify-content: center;
  transition: color var(--duration-dim) var(--ease-smooth);
}

.time-digit {
  display: inline-block;
  min-width: 0.6em;
  text-align: center;
}

.time-colon {
  display: inline-block;
  opacity: 0.65;
  margin: 0 0.05em;
  font-weight: 300;
}

.time-unit-label {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-left: 4px;
}

/* Headings & Section Titles */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.25;
  color: var(--color-text);
}

.section-title {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 8px;
}

.phase-title {
  font-family: var(--font-sans);
  font-size: clamp(1.1rem, 3.2vw, 1.5rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  text-align: center;
}

.phase-subtitle {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  text-align: center;
}

.round-counter {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* Breath Guidance Instruction */
.breath-instruction {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  text-align: center;
  height: 1.75rem;
  transition: opacity var(--duration-base) var(--ease-smooth);
}