/* Sticker Studio for WhatsApp.
 *
 * The tokens are declared here, because a web-project is self-contained and
 * never imports the site's global CSS. The values echo the portfolio's own
 * palette by eye so the tool sits alongside it, without depending on it.
 *
 * Two things in this file carry meaning rather than taste:
 *
 *  - `.canvas-wrap` draws a checkerboard. It is the only way a person can see
 *    what a transparent sticker actually looks like, and a sticker with no
 *    transparency is the commonest mistake this tool exists to prevent.
 *  - The one breakpoint, 60rem, is queried here and in `app.js` with the same
 *    string, so the two can never disagree about which layout is showing.
 */

:root {
  color-scheme: light dark;

  --bg: #eef0f5;
  --surface: #ffffff;
  --surface-sunk: #f4f5f8;
  --border: rgba(20, 20, 34, 0.09);
  --border-strong: rgba(20, 20, 34, 0.16);

  --text: #141422;
  --text-body: #2e2e3e;
  --muted: #6b6b80;

  --accent: rgb(220 90 0);
  --accent-rgb: 220, 90, 0;
  --accent-ink: rgb(150 58 0);
  --accent-soft: rgba(220, 90, 0, 0.1);

  --danger: #b3261e;
  --danger-soft: rgba(179, 38, 30, 0.1);
  --warn: #8a5a00;
  --warn-soft: rgba(180, 120, 0, 0.12);
  --good: #1f6b3a;
  --good-soft: rgba(31, 107, 58, 0.1);

  --shadow-sm: 0 1px 3px rgba(20, 20, 34, 0.06);
  --shadow-md: 0 6px 24px rgba(20, 20, 34, 0.09);
  --shadow-lg: 0 16px 48px rgba(20, 20, 34, 0.14);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --fast: 120ms;
  --normal: 220ms;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    sans-serif;

  /* The two greys of the transparency checkerboard. */
  --check-a: #e2e4ea;
  --check-b: #f7f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101017;
    --surface: #191922;
    --surface-sunk: #14141c;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);

    --text: #f2f2f6;
    --text-body: #d3d3de;
    --muted: #9a9aae;

    --accent: #ff8f45;
    --accent-rgb: 255, 143, 69;
    --accent-ink: #ffb488;
    --accent-soft: rgba(255, 143, 69, 0.14);

    --danger: #ff8a80;
    --danger-soft: rgba(255, 138, 128, 0.14);
    --warn: #ffcc66;
    --warn-soft: rgba(255, 204, 102, 0.14);
    --good: #7ddba0;
    --good-soft: rgba(125, 219, 160, 0.14);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);

    --check-a: #24242e;
    --check-b: #1c1c25;
  }
}

* {
  box-sizing: border-box;
}

/* The `hidden` attribute is `display: none` in the browser's own stylesheet,
 * and any `display` rule written here beats it. `.tool` and `.stage` both set
 * `display: flex`, so without this every tool panel shows at once and the tabs
 * do nothing. This has to stay ahead of every layout rule below. */
[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-body);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

.page {
  max-width: 78rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

/* Masthead */

.masthead {
  text-align: center;
  padding: 1rem 0 1.5rem;
}

h1 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.6rem, 6vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.5rem auto 0;
  max-width: 34rem;
  color: var(--muted);
}

.lang {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 1rem;
}

.lang button {
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--muted);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.75rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.lang button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* Panels */

main {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem;
}

h2 {
  margin: 0 0 1rem;
  color: var(--text);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.banner {
  margin: 0;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid var(--danger);
  font-size: 0.92rem;
}

/* Picking a picture */

.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 2rem 1rem;
  text-align: center;
  transition: border-color var(--fast) var(--ease), background var(--fast) var(--ease);
}

.dropzone.over {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.dropzone-line {
  margin: 0 0 1rem;
  color: var(--text);
}

/* Buttons */

.button {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: var(--surface-sunk);
  color: var(--text);
  border-radius: var(--radius-full);
  padding: 0.6rem 1.15rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--fast) var(--ease), background var(--fast) var(--ease),
    border-color var(--fast) var(--ease);
}

.button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.button:active:not(:disabled) {
  transform: translateY(1px);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.button.primary:hover:not(:disabled) {
  background: var(--accent-ink);
  border-color: var(--accent-ink);
  color: #fff;
}

.button.ghost {
  background: transparent;
}

.button.small {
  padding: 0.35rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
}

.button.danger {
  color: var(--danger);
  border-color: var(--danger-soft);
}

.button.danger:hover:not(:disabled) {
  border-color: var(--danger);
  color: var(--danger);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0.75rem 0;
}

.row.exports {
  margin-top: 1.25rem;
}

/* The sticker stage */

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.canvas-wrap {
  position: relative;
  width: 100%;
  max-width: 512px;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  /* The checkerboard. Without it a person cannot tell a transparent
   * background from a white one, which is the whole point of a sticker. */
  background-image: conic-gradient(
    var(--check-a) 0% 25%,
    var(--check-b) 25% 50%,
    var(--check-a) 50% 75%,
    var(--check-b) 75% 100%
  );
  background-size: 24px 24px;
  touch-action: none;
}

.canvas-wrap canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#overlay {
  pointer-events: none;
}

.canvas-wrap.painting {
  cursor: crosshair;
}

.stage-side {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
}

.status {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

/* Tool tabs */

.tabs {
  display: flex;
  gap: 0.3rem;
  overflow-x: auto;
  margin: 1.25rem 0 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
  scrollbar-width: thin;
}

.tabs button {
  flex: 0 0 auto;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--fast) var(--ease), background var(--fast) var(--ease);
}

.tabs button[aria-selected="true"] {
  color: var(--accent);
  background: var(--accent-soft);
}

.tool {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* Fields */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin: 0.5rem 0;
}

.field.inline {
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
}

.field-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
}

.field-label output {
  color: var(--muted);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.empty {
  margin: 0.5rem 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-style: italic;
}

.count {
  margin: 0.5rem 0 0.25rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

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

input[type="text"],
textarea,
select {
  width: 100%;
  border: 1px solid var(--border-strong);
  background: var(--surface-sunk);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.7rem;
  font: inherit;
}

input[type="text"]:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

input[type="color"] {
  width: 3rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
}

textarea {
  resize: vertical;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.check input {
  accent-color: var(--accent);
  width: 1.05rem;
  height: 1.05rem;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Chip rows: colour presets, emoji suggestions */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.5rem 0;
}

.chips button {
  border: 1px solid var(--border-strong);
  background: var(--surface-sunk);
  color: var(--text-body);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.75rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color var(--fast) var(--ease), color var(--fast) var(--ease);
}

.chips button:hover,
.chips button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.chips.emoji button {
  font-size: 1.15rem;
  padding: 0.2rem 0.55rem;
  line-height: 1.4;
}

/* Segmented control: the brush modes */

.segmented {
  display: flex;
  gap: 0.25rem;
  background: var(--surface-sunk);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 0.2rem;
  margin: 0.75rem 0 0.25rem;
}

.segmented button {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.5rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease);
}

.segmented button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Text layers */

.layers {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.layer {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  background: var(--surface-sunk);
}

.layer.selected {
  border-color: var(--accent);
}

.layer-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.layer-title {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
}

.layer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

/* The frame strip */

.strip {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem 0.15rem;
  scrollbar-width: thin;
}

.frame {
  flex: 0 0 auto;
  width: 5.25rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-sunk);
  padding: 0.25rem;
  cursor: pointer;
  text-align: center;
  font: inherit;
  color: var(--muted);
  transition: border-color var(--fast) var(--ease);
}

.frame[aria-current="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.frame canvas,
.frame img {
  width: 100%;
  aspect-ratio: 1;
  display: block;
  border-radius: 6px;
  background-image: conic-gradient(
    var(--check-a) 0% 25%,
    var(--check-b) 25% 50%,
    var(--check-a) 50% 75%,
    var(--check-b) 75% 100%
  );
  background-size: 12px 12px;
}

.frame-label {
  display: block;
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  margin-top: 0.15rem;
}

.frame-actions {
  display: flex;
  gap: 0.15rem;
  justify-content: center;
  margin-top: 0.15rem;
}

.frame-actions button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.8rem;
  line-height: 1;
  padding: 0.15rem 0.25rem;
  border-radius: 6px;
  cursor: pointer;
}

.frame-actions button:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

/* Findings */

.check-summary {
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--text);
}

.check-summary.pass {
  color: var(--good);
}

.findings {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.findings li {
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  font-size: 0.9rem;
  border-left: 3px solid transparent;
}

.findings li.error {
  background: var(--danger-soft);
  border-left-color: var(--danger);
  color: var(--danger);
}

.findings li.warning {
  background: var(--warn-soft);
  border-left-color: var(--warn);
  color: var(--warn);
}

.rules {
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
}

.rules summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
}

.rules ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.rules p {
  color: var(--muted);
  font-size: 0.88rem;
}

/* The pack */

.pack-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
  margin: 1rem 0;
}

.badge {
  display: inline-block;
  border-radius: var(--radius-full);
  padding: 0.1rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--accent-soft);
  color: var(--accent);
  vertical-align: 0.05em;
}

.pack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(5.5rem, 1fr));
  gap: 0.6rem;
  margin: 0.5rem 0;
}

.pack-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.3rem;
  background: var(--surface-sunk);
  text-align: center;
}

.pack-item img {
  width: 100%;
  aspect-ratio: 1;
  display: block;
  border-radius: 6px;
  background-image: conic-gradient(
    var(--check-a) 0% 25%,
    var(--check-b) 25% 50%,
    var(--check-a) 50% 75%,
    var(--check-b) 75% 100%
  );
  background-size: 12px 12px;
}

.pack-item.tray {
  border-color: var(--accent);
}

.pack-item-meta {
  display: block;
  font-size: 0.7rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-top: 0.15rem;
}

.pack-item-actions {
  display: flex;
  gap: 0.1rem;
  justify-content: center;
  margin-top: 0.15rem;
  flex-wrap: wrap;
}

.pack-item-actions button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  line-height: 1;
  padding: 0.2rem 0.3rem;
  border-radius: 6px;
  cursor: pointer;
}

.pack-item-actions button:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

/* Footer */

.footer {
  margin-top: 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer p {
  margin: 0.4rem 0;
}

.privacy {
  max-width: 34rem;
  margin: 0 auto 0.5rem;
}

.footer a {
  color: var(--accent);
}

.back-link {
  font-weight: 600;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

/* Wide screens: the sticker sits beside its tools instead of above them.
 * `app.js` asks for this same query, once, so the two cannot disagree. */

@media (min-width: 60rem) {
  .page {
    padding: 2rem 1.5rem 4rem;
  }

  .panel {
    padding: 1.75rem;
  }

  #editor-panel {
    display: grid;
    grid-template-columns: minmax(20rem, 26rem) 1fr;
    grid-template-areas:
      "heading heading"
      "stage tools";
    column-gap: 2rem;
    align-items: start;
  }

  #edit-heading {
    grid-area: heading;
  }

  .stage {
    grid-area: stage;
    /* The sticker stays in view while the tool panel beside it scrolls, so
     * a slider always shows its own effect. */
    position: sticky;
    top: 1.5rem;
  }

  #editor-panel .tools {
    grid-area: tools;
  }

  #editor-panel .tabs {
    margin-top: 0;
  }

  .pack-meta {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .layer-grid {
    grid-template-columns: 1fr 1fr;
  }
}