/* ==========================================================================
   base.css — Factory.ai
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  letter-spacing: var(--tr-tight);
  line-height: var(--lh-normal);
  color: var(--text-ink);
  background: var(--surface-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  transition: background-color var(--t-theme), color var(--t-theme);
}

body * {
  transition:
    background-color var(--t-theme),
    color var(--t-theme),
    border-color var(--t-theme),
    fill var(--t-theme),
    stroke var(--t-theme);
}

.no-theme-transition,
.no-theme-transition * { transition: none !important; }

/* ----- Smooth language change (fade out → swap → fade in) ----- */
[data-i18n] {
  transition: opacity 0.15s ease;
}

body.lang-changing [data-i18n] {
  opacity: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: var(--fw-regular);
  color: var(--text-ink);
  letter-spacing: var(--tr-display);
  line-height: var(--lh-snug);
}

h1 { font-size: var(--fs-display); line-height: var(--lh-tight); letter-spacing: var(--tr-display); }
h2 { font-size: var(--fs-h2); letter-spacing: var(--tr-heading); }
h3 { font-size: var(--fs-h3); letter-spacing: -0.030em; }
h4 { font-size: var(--fs-subhead); letter-spacing: var(--tr-tight); }

p {
  line-height: var(--lh-normal);
  color: var(--text-caption);
  letter-spacing: var(--tr-tight);
}

a {
  color: var(--text-ink);
  text-decoration: none;
  transition: color var(--t-fast), opacity var(--t-fast);
}

a:hover { opacity: 0.7; }

strong, b { font-weight: var(--fw-regular); }

code, pre, kbd {
  font-family: var(--font-mono);
  letter-spacing: var(--tr-mono);
}

ul, ol { list-style: none; }

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  letter-spacing: inherit;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

@media (max-width: 640px) {
  .container { padding: 0 var(--container-pad-mobile); }
}

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

.text-muted { color: var(--text-caption); }
.text-tertiary { color: var(--text-mute); }
.text-center { text-align: center; }

.mono {
  font-family: var(--font-mono);
  letter-spacing: var(--tr-mono);
}

.highlight { color: var(--accent-orange); }

.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-orange);
  flex-shrink: 0;
  vertical-align: middle;
}

.dot-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--tr-mono);
  text-transform: uppercase;
  color: var(--text-ink);
  margin-bottom: var(--sp-5);
}