/* Feature styles — token vocabulary only (values live in tokens.css). */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-page);
  color: var(--color-ink);
  font-family: var(--font-stack);
  font-size: var(--text-base);
  line-height: 1.55;
}

.page {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

/* ---- Layer 1: page entrance cascade (fade → translate → scale) ---- */

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(5%) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.stagger {
  animation: enter var(--entrance-duration) var(--ease-out) both;
  animation-delay: calc(var(--slot) * var(--entrance-step));
}

@media (prefers-reduced-motion: reduce) {
  .stagger {
    animation: none;
  }
}

/* ---- Hero (Tier B: icon tile + title + subtitle on accent gradient) ---- */

.hero {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-8);
  border-radius: var(--radius-hero);
  background: var(--gradient-accent);
  color: var(--color-on-accent);
  box-shadow: var(--shadow-glow-accent);
}

.hero-icon {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: var(--space-12);
  height: var(--space-12);
  border-radius: var(--radius-card);
  background: var(--color-on-accent-tint);
}

.hero-icon svg {
  width: var(--space-6);
  height: var(--space-6);
}

.hero h1 {
  margin: 0;
  font-size: var(--text-hero);
  line-height: 1.2;
}

.hero p {
  margin: var(--space-1) 0 0;
  color: var(--color-on-accent-soft);
}

/* ---- Two-column workspace ---- */

.workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

/* Breakpoint mirrors --breakpoint-two-column (media queries cannot read vars). */
@media (min-width: 700px) {
  .workspace {
    grid-template-columns: 5fr 4fr;
  }
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* ---- Form fields ---- */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field > label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-soft);
}

input[type="text"] {
  font: inherit;
  color: inherit;
  padding: var(--space-3) var(--space-4);
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-page);
  outline-color: var(--color-accent);
}

/* Style picker — filter chips: pill + icon, selected = filled accent */

.chips {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* Selection fill animates BOTH ways — the incoming chip's accent fades in
   while the outgoing chip's fades out; never an instant paint jump. */
.chip {
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border: none;
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition:
    transform var(--anim-medium) var(--ease-out),
    box-shadow var(--anim-medium) var(--ease-out),
    background-color var(--anim-medium) var(--ease-out),
    color var(--anim-medium) var(--ease-out);
}

.chip:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-card);
}

.chip[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-on-accent);
  box-shadow: var(--shadow-accent-hover);
}

.field-row {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.field-row .field {
  flex: 1;
  min-width: 0;
}

input[type="color"] {
  width: 100%;
  height: var(--space-8);
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.checkbox input {
  accent-color: var(--color-accent);
  cursor: pointer;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--color-accent);
  cursor: pointer;
}

select {
  font: inherit;
  padding: var(--space-2) var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-page);
  color: inherit;
  cursor: pointer;
  outline-color: var(--color-accent);
}

/* ---- Buttons: primary = filled accent; secondary = plain text ---- */

.actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.button {
  font: inherit;
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition:
    transform var(--anim-medium) var(--ease-out),
    box-shadow var(--anim-medium) var(--ease-out);
}

.button-primary {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.button-primary:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-accent-hover);
}

.button-text {
  background: none;
  color: var(--color-accent);
  padding: var(--space-3) var(--space-4);
}

.button-text:hover {
  transform: scale(1.03);
}

.button[aria-disabled="true"] {
  opacity: var(--o70);
  pointer-events: none;
}

/* ---- Preview region (empty / error / data funnel) ---- */

.preview-region {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-card);
  overflow: hidden;
  background:
    repeating-conic-gradient(
      var(--color-checker) 0% 25%,
      var(--color-surface) 0% 50%
    )
    0 0 / calc(var(--checker-tile) * 2) calc(var(--checker-tile) * 2);
}

.preview-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-6);
  text-align: center;
  background: var(--color-surface);
  opacity: 1;
  transition: opacity var(--anim-slow) var(--ease-out);
}

.preview-state[hidden] {
  display: flex;
  opacity: 0;
  pointer-events: none;
}

.preview-state h3 {
  margin: 0;
  font-size: var(--text-lg);
}

.preview-state p {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.preview-state .state-icon {
  width: var(--space-12);
  height: var(--space-12);
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  background: var(--color-page);
  color: var(--color-accent);
}

.preview-state.is-error .state-icon {
  background: var(--color-danger-soft);
  color: var(--color-danger);
}

.preview-state .state-icon svg {
  width: var(--space-6);
  height: var(--space-6);
}

/* Old image stays until the new one loads, then they crossfade. */
.preview-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 1;
  transition: opacity var(--anim-slow) var(--ease-out);
}

.preview-img.is-leaving {
  opacity: 0;
  transition-timing-function: var(--ease-in);
}

.footer {
  text-align: center;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  padding-bottom: var(--space-8);
}

.footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}