/* Light floating-panel UI (visu.haus-inspired): grouped, collapsible controls. */

:root {
  --ink: #16181c;
  --ink-soft: #6b7078;
  --ink-faint: #a5aab2;
  --card: #ffffff;
  --line: #ececec;
  --page: #f4f4f2;
  --accent: #16181c;
  --radius-card: 16px;
  --radius-el: 9px;
  --panel-w: 280px;
  font-size: 13px;
}

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

html,
body {
  height: 100%;
}

body {
  display: flex;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background-color: var(--page);
  background-image: radial-gradient(#dcdcd8 1px, transparent 1px);
  background-size: 22px 22px;
  overflow: hidden;
}

/* ── Sidebar panel ─────────────────────────────────────────────────────────── */

#controls {
  position: fixed;
  top: 14px;
  left: 14px;
  bottom: 14px;
  width: var(--panel-w);
  background: var(--card);
  border-radius: var(--radius-card);
  box-shadow: 0 1px 2px rgba(20, 22, 26, 0.05), 0 8px 28px rgba(20, 22, 26, 0.09);
  overflow-y: auto;
  overscroll-behavior: contain;
  z-index: 10;
  scrollbar-width: none;
}

#controls::-webkit-scrollbar {
  display: none;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 16px 16px 14px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--card);
  z-index: 2;
}

.panel-title {
  font-weight: 600;
  font-size: 13px;
  letter-spacing: -0.01em;
}

.panel-actions {
  display: flex;
  gap: 6px;
}

.btn-primary {
  font: inherit;
  font-weight: 550;
  padding: 7px 13px;
  border: none;
  border-radius: 99px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.btn-primary:hover {
  background: #33363c;
}

.btn-icon {
  font: inherit;
  width: 30px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}

.btn-icon:hover {
  background: var(--page);
}

/* ── Collapsible groups ───────────────────────────────────────────────────── */

.group {
  border-bottom: 1px solid var(--line);
}

.group:last-of-type {
  border-bottom: none;
}

.group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 15px 16px;
  border: none;
  background: none;
  font: inherit;
  font-size: 14px;
  font-weight: 550;
  letter-spacing: -0.01em;
  color: var(--ink);
  cursor: pointer;
}

.chev {
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--ink-faint);
  border-bottom: 1.5px solid var(--ink-faint);
  transform: rotate(-45deg);
  transition: transform 0.18s ease;
  margin-right: 2px;
}

.group.open .chev {
  transform: rotate(45deg);
}

.group-body {
  display: none;
  padding: 2px 16px 18px;
}

.group.open .group-body {
  display: block;
}

/* ── Fields ───────────────────────────────────────────────────────────────── */

.field {
  margin-bottom: 13px;
}

.field-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 7px;
}

.field-head label {
  font-size: 11.5px;
  color: var(--ink-soft);
}

.val {
  font-family: "Geist Mono", monospace;
  font-size: 10.5px;
  color: var(--ink-faint);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 26px;
  border-radius: 99px;
  background: var(--page);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink);
  border: none;
  margin-top: 0;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink);
  border: none;
}

select {
  font: inherit;
  font-size: 12px;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-el);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 30px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-el);
  background: var(--card);
  cursor: pointer;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 3px;
}

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 6px;
}

/* ── Toggles / radios / buttons ───────────────────────────────────────────── */

.switch-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 4px 0 13px;
  font-size: 11.5px;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
}

.switch-row input {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
}

.radio-stack {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 13px;
}

.radio-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-el);
  font-size: 11.5px;
  color: var(--ink-soft);
  cursor: pointer;
  user-select: none;
}

.radio-pill:has(input:checked) {
  border-color: var(--ink);
  color: var(--ink);
}

.radio-pill input {
  accent-color: var(--accent);
  width: 13px;
  height: 13px;
}

.preset-row {
  display: flex;
  gap: 5px;
  margin-bottom: 13px;
}

.preset-btn {
  flex: 1;
  font: inherit;
  font-size: 11px;
  padding: 7px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-el);
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
}

.preset-btn:hover {
  border-color: var(--ink-faint);
  color: var(--ink);
}

.upload-row {
  display: flex;
  gap: 6px;
  align-items: stretch;
  margin-bottom: 6px;
}

.upload-label {
  flex: 1;
  display: block;
  text-align: center;
  padding: 8px 0;
  border: 1px dashed var(--ink-faint);
  border-radius: var(--radius-el);
  font-size: 11.5px;
  color: var(--ink-soft);
  cursor: pointer;
}

.upload-label:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.upload-label input {
  display: none;
}

.btn-tiny {
  font: inherit;
  font-size: 11px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-el);
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
}

.btn-tiny:disabled {
  opacity: 0.4;
  cursor: default;
}

.file-meta {
  font-size: 10.5px;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

/* ── Canvas stage ─────────────────────────────────────────────────────────── */

.pattern {
  flex: 1;
  height: 100vh;
  margin-left: calc(var(--panel-w) + 28px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  overflow: auto;
}

.pattern canvas {
  max-width: 100%;
  max-height: calc(100vh - 48px);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(20, 22, 26, 0.08), 0 18px 50px rgba(20, 22, 26, 0.14);
}

#textAreaMarker {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 1px dashed rgba(20, 22, 26, 0.35);
  border-radius: 3px;
  pointer-events: none;
  opacity: 0;
}

/* ── Small screens ────────────────────────────────────────────────────────── */

@media (max-width: 760px) {
  body {
    overflow: auto;
    flex-direction: column;
  }

  #controls {
    position: static;
    width: auto;
    margin: 10px;
    max-height: none;
  }

  .pattern {
    margin-left: 0;
    height: auto;
  }
}

.num-input {
  font-family: "Geist Mono", monospace;
  font-size: 10.5px;
  width: 58px;
  padding: 3px 6px;
  text-align: right;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink);
  -moz-appearance: textfield;
  appearance: textfield;
}

.num-input::-webkit-outer-spin-button,
.num-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.num-input:focus {
  outline: none;
  border-color: var(--ink-faint);
}

/* Checkerboard reveals canvas transparency on screen (never exported). */
.pattern canvas.transparent {
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #e2e2e0 25%, transparent 25%, transparent 75%, #e2e2e0 75%),
    linear-gradient(45deg, #e2e2e0 25%, transparent 25%, transparent 75%, #e2e2e0 75%);
  background-size: 18px 18px;
  background-position: 0 0, 9px 9px;
}

input[type="color"]:disabled {
  opacity: 0.4;
  cursor: default;
}