/* ============================================================================
   ThinkPing v1.1 — Base Reset & Typography
   Reference: Beat 02 §2.3 + §2.5
   ============================================================================ */

/* --- Modern CSS Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  
  /* Subtle paper texture */
  background-image: 
    radial-gradient(ellipse at top left, rgba(198, 93, 72, 0.025), transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(43, 37, 32, 0.015), transparent 50%);
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

button:disabled {
  cursor: not-allowed;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* --- Typography --- */
.type-display-xl {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  font-weight: 400;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.type-display-lg {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: 400;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.type-display {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 400;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.type-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  line-height: var(--leading-snug);
}

.type-subheading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: var(--leading-snug);
}

.type-body-lg {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
}

.type-body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
}

.type-body-strong {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: var(--leading-normal);
}

.type-caption {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-normal);
}

.type-button {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
}

.type-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-muted);
}

.type-label-accent {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-accent);
}

.type-mention {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-accent);
}

.type-timestamp {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* --- Italic accents (coral) --- */
.italic-accent {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  color: var(--text-accent);
}

/* --- Focus ring (accessibility) --- */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Selection --- */
::selection {
  background: var(--primitive-coral-200);
  color: var(--primitive-ink-500);
}

/* --- Utility: screen reader only --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}