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

@font-face {
  font-family: "PP Neue Montreal";
  src:
    local("PP Neue Montreal Bold"),
    local("PPNeueMontreal-Bold");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "PP Neue Montreal";
  src:
    local("PP Neue Montreal Book"),
    local("PPNeueMontreal-Book");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "PP Neue Montreal";
  src:
    local("PP Neue Montreal Medium"),
    local("PPNeueMontreal-Medium");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

:root {
  --panel-w: clamp(260px, 30vw, 336px);
  --head-title-w: var(--panel-w);
  --head-pad-y: 6px;
  --head-pad-top: 10px;
  --panel-pad-x: 12px;
  --panel-pad-y: 10px;
  --canvas-chrome-bottom: 16px;
  --panel-pad-bottom: var(--canvas-chrome-bottom);
  --panel-section-gap: 14px;
  --radius-pill: 999px;
  --font: "PP Neue Montreal", "Neue Montreal", system-ui, sans-serif;
  --font-ui: "Outfit", system-ui, sans-serif;
  --type-section-size: clamp(14px, 4.2cqh, 17px);
  --btn-topbar-size: 11px;
  --mobile-compose-h: 58px;
  --mobile-head-h: 48px;
}

html,
body {
  height: 100%;
  min-height: 100dvh;
}

body {
  overflow: hidden;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  background: var(--white);
  color: var(--black);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.app {
  display: grid;
  grid-template-columns: var(--panel-w) 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "head head"
    "panel canvas";
  height: 100dvh;
  min-height: 100vh;
  overflow: hidden;
}

/* ─── App header (title + top bar row) ──────────────────────────────────── */

.app-head {
  grid-area: head;
  display: grid;
  grid-template-columns: var(--head-title-w) 1fr;
  align-items: stretch;
  border-bottom: var(--border);
  background: var(--white);
  min-width: 0;
}

.app-head-title {
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  align-self: stretch;
  width: 100%;
  box-sizing: border-box;
  padding: var(--head-pad-top) var(--panel-pad-x) var(--head-pad-y);
  border-right: var(--border);
  min-width: 0;
  min-height: 100%;
  container-type: inline-size;
  container-name: head-title;
}

.app-head-title .panel-title {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  font-size: clamp(11px, 9.2cqi, 30px);
  letter-spacing: -0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─── Top bar ───────────────────────────────────────────────────────────── */

.topbar {
  background: var(--white);
  flex-shrink: 0;
  min-height: 0;
  min-width: 0;
  display: flex;
  align-items: stretch;
}

.topbar-main {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 10px;
  padding: var(--head-pad-top) 14px var(--head-pad-y);
  min-width: 0;
  flex: 1;
}

.topbar-about {
  flex: 1 1 auto;
  min-width: 0;
  max-width: none;
  margin: 0;
  font-family: var(--font-ui);
  font-size: clamp(8.5px, 0.72vw, 10px);
  font-weight: 400;
  line-height: 1.35;
  color: var(--grey);
  text-wrap: pretty;
}

.topbar-main .topbar-about {
  display: block;
  overflow: visible;
  white-space: normal;
  line-height: 1.35;
}

.topbar-divider {
  width: 1px;
  height: 28px;
  background: var(--grey-light);
  flex-shrink: 0;
}

.topbar-toggles {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-label {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--grey);
  white-space: nowrap;
}

/* Sliding on/off switch */
.switch {
  position: relative;
  display: inline-flex;
  cursor: pointer;
  user-select: none;
}

.switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-track {
  display: block;
  width: 38px;
  height: 22px;
  border: var(--border);
  border-radius: var(--radius-pill);
  background: var(--white);
  position: relative;
  transition: background 0.15s;
}

.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border: var(--border);
  border-radius: 50%;
  background: var(--white);
  transition: transform 0.15s ease, background 0.15s;
}

.switch input:checked + .switch-track {
  background: var(--orange);
}

.switch input:checked + .switch-track .switch-thumb {
  transform: translateX(16px);
}

.switch input:focus-visible + .switch-track {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.switch-wide {
  display: block;
  width: 100%;
}

.switch-wide .switch-track {
  width: 100%;
  height: 26px;
  padding: 2px;
  box-sizing: border-box;
  background: var(--orange);
  border-color: var(--black);
  transition: background 0.15s, border-color 0.15s;
}

.switch-wide input:checked + .switch-track {
  background: var(--white);
  border-color: var(--black);
}

.switch-wide input:not(:checked) + .switch-track {
  background: var(--orange);
  border-color: var(--black);
}

.switch-wide .switch-thumb {
  top: 2px;
  left: 2px;
  width: 56%;
  height: calc(100% - 4px);
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  box-sizing: border-box;
  background: var(--white);
  border: var(--border);
  transition: left 0.15s ease;
  transform: none;
}

.switch-wide input:not(:checked) + .switch-track .switch-thumb {
  left: calc(44% - 2px);
}

.switch-wide input:checked + .switch-track .switch-thumb {
  left: 2px;
  transform: none;
}

.switch-wide .switch-thumb-text {
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
  color: var(--grey);
}

.switch-wide input:checked + .switch-track .switch-thumb-text-off {
  display: none;
}

.switch-wide input:not(:checked) + .switch-track .switch-thumb-text-on {
  display: none;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  flex-shrink: 0;
}

.btn-topbar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 14px;
  border: var(--border);
  border-radius: var(--radius-pill);
  background: var(--white);
  color: var(--black);
  font-family: var(--font);
  font-size: var(--btn-topbar-size);
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
  text-transform: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.12s, opacity 0.12s;
}

.btn-topbar:hover:not(:disabled) {
  background: var(--grey-bg);
}

.btn-topbar:active:not(:disabled) {
  background: var(--grey-light);
}

.btn-topbar:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-write {
  background: var(--orange);
  color: var(--white);
  border-color: var(--black);
}

.btn-write:hover:not(:disabled) {
  background: var(--orange-dim);
}

.btn-write:active:not(:disabled) {
  background: var(--accent-active);
}

.btn-save {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.btn-save:hover:not(:disabled) {
  background: var(--save-hover);
}

.btn-save:active:not(:disabled) {
  background: var(--save-active);
}

/* ─── Panel ─────────────────────────────────────────────────────────────── */

.panel {
  flex: 1;
  min-height: 0;
  background: var(--white);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  min-height: 0;
  min-width: 0;
  max-width: 100%;
  container-type: size;
  container-name: panel;
  -webkit-overflow-scrolling: touch;
}

.panel-inner {
  flex: 1;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  padding: var(--panel-pad-y) var(--panel-pad-x) var(--panel-pad-bottom);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: var(--panel-section-gap);
}

.panel-column {
  grid-area: panel;
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  height: 100%;
  border-right: var(--border);
}

.compose-bar {
  flex-shrink: 0;
  padding: var(--panel-pad-y) var(--panel-pad-x) 8px;
  background: var(--white);
}

.compose-slot-panel {
  flex-shrink: 0;
}

.compose-slot-panel .text-in {
  width: 100%;
}

@media (min-width: 721px) {
  .compose-bar {
    display: none;
  }

  .panel-column {
    display: flex;
    flex-direction: column;
    height: 100%;
  }

  .panel {
    flex: 1;
    min-height: 0;
    border-right: none;
  }

  .panel-sheet {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
  }

  .panel-inner {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
  }
}

@media (min-width: 1025px) {
  .section-text {
    margin-top: auto;
  }

  .section-physics {
    flex-shrink: 0;
  }
}

.panel-sheet {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.panel-settings-head,
.panel-settings-backdrop,
.panel-settings-about {
  display: none;
}

.panel-settings-body {
  display: contents;
}

.compose-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.compose-row .text-in {
  flex: 1;
  min-width: 0;
}

.btn-menu {
  flex-shrink: 0;
  width: 42px;
  padding: 0;
  border: var(--border);
  border-radius: var(--radius-pill);
  background: var(--white);
  color: var(--black);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}

.btn-menu-icon {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--black);
  box-shadow: 0 -5px 0 var(--black), 0 5px 0 var(--black);
}

.btn-menu:hover {
  background: var(--grey-bg);
}

.btn-menu[aria-expanded="true"] {
  background: var(--orange);
}

.btn-menu[aria-expanded="true"] .btn-menu-icon {
  background: var(--white);
  box-shadow: 0 -5px 0 var(--white), 0 5px 0 var(--white);
}

.btn-settings-close {
  width: 32px;
  height: 32px;
  padding: 0;
  border: var(--border);
  border-radius: var(--radius-pill);
  background: var(--white);
  font-family: var(--font);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

.btn-settings-close:hover {
  background: var(--grey-bg);
}

.panel-title {
  width: 100%;
  max-width: 100%;
  font-family: var(--font);
  font-size: clamp(15px, 9.5cqi, 31px);
  font-weight: 500;
  letter-spacing: clamp(0, 0.2cqi, 0.006em);
  line-height: 1;
  text-align: left;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.section {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex-shrink: 1;
  min-height: 0;
  min-width: 0;
}

.section-label {
  font-family: var(--font);
  font-size: var(--type-section-size);
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0.02em;
  color: var(--orange);
  padding-left: 2px;
  line-height: 1.1;
}

.card {
  border: var(--border);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--white);
  min-width: 0;
  max-width: 100%;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
  min-width: 0;
}

/* ─── Appearance / colours ────────────────────────────────────────────────── */

.color-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
}

.pen-pendulum-row {
  align-items: start;
}

.field-pendulum-toggle .pendulum-switch-wrap {
  width: 100%;
  min-height: 26px;
}

.swatch {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border: var(--border);
  cursor: pointer;
  min-width: 0;
}

.swatch-label {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--grey);
  white-space: nowrap;
}

.swatch input[type="color"] {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border: var(--border);
  padding: 0;
  border-radius: 0;
  overflow: hidden;
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.swatch input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
  border-radius: 0;
}

.swatch input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 0;
}

.swatch input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 0;
}

.theme-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.canvas-theme-picker {
  position: absolute;
  left: 16px;
  bottom: 0;
  z-index: 20;
  pointer-events: auto;
  max-width: min(42vw, 320px);
}

.theme-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 22px;
  padding: 0 10px;
  border: var(--border);
  border-radius: var(--theme-btn-radius, var(--radius-pill));
  background: var(--theme-btn-inactive-bg, #ffffff);
  color: var(--theme-btn-inactive-fg, var(--grey));
  font-family: var(--font);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
  text-transform: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, opacity 0.12s;
}

.theme-option:hover:not(.is-active) {
  background: var(--grey-bg);
  color: var(--theme-btn-inactive-fg, var(--grey));
}

.theme-option:active:not(.is-active) {
  background: var(--grey-light);
  color: var(--theme-btn-inactive-fg, var(--grey));
}

.theme-option.is-active {
  background: var(--theme-btn-active-bg, var(--orange));
  color: var(--theme-btn-active-fg, var(--white));
  border-color: var(--border-color);
}

.theme-option.is-active:hover {
  background: var(--theme-btn-active-hover, var(--orange-dim));
  color: var(--theme-btn-active-fg, var(--white));
}

.theme-option.is-active:active {
  background: var(--theme-btn-active-press, var(--accent-active));
  color: var(--theme-btn-active-fg, var(--white));
}

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

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  min-height: 18px;
}

.field-top > span:first-child {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--grey);
  line-height: 1;
}

.val {
  font-size: clamp(15px, 3.2cqh, 20px);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 18px;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--black);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -5.5px;
  background: var(--orange);
  border: var(--border);
  border-radius: 0;
}

input[type="range"]::-moz-range-track {
  height: 1px;
  background: var(--black);
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--orange);
  border: var(--border);
  border-radius: 0;
}

.text-in {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  padding: 9px 12px;
  background: var(--white);
  border: var(--border);
  color: var(--black);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
}

.text-in:focus {
  outline: 2px solid var(--orange);
  outline-offset: -1px;
}

.text-in::placeholder {
  color: #b0b0b0;
  font-size: 12px;
  font-weight: 400;
  font-style: italic;
}

.select-in {
  width: 100%;
  padding: 9px 32px 9px 12px;
  background: var(--white);
  border: var(--border);
  color: var(--black);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23000' stroke-width='1.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.select-in:focus {
  outline: 2px solid var(--orange);
  outline-offset: -1px;
}

.select-in:disabled {
  opacity: 0.5;
  cursor: wait;
}

.card-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.field-font {
  gap: 8px;
  position: relative;
}

.font-picker {
  position: relative;
}

.font-picker-native {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.font-picker-trigger {
  display: block;
  width: 100%;
  text-align: left;
}

.font-picker-trigger:disabled {
  opacity: 0.5;
  cursor: wait;
}

.font-picker-list {
  position: fixed;
  z-index: 1000;
  max-height: min(280px, 42vh);
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--white);
  border: var(--border);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
  -webkit-overflow-scrolling: touch;
}

.font-picker-list[hidden] {
  display: none;
}

.font-picker-option {
  display: block;
  width: 100%;
  padding: 9px 12px;
  border: none;
  border-bottom: 1px solid var(--grey-bg);
  background: var(--white);
  text-align: left;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.2;
  cursor: pointer;
  color: var(--black);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.font-picker-option:last-child {
  border-bottom: none;
}

.font-picker-option:hover,
.font-picker-option[aria-selected="true"] {
  background: var(--grey-bg);
}

.font-picker-option:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
}

/* ─── Letter grid ───────────────────────────────────────────────────────── */

.letter-grid {
  container-type: inline-size;
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 1fr));
  gap: clamp(1px, 1cqi, 3px);
  width: 100%;
  min-width: 0;
  max-width: 100%;
}

.letter-grid button {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  height: auto;
  padding: 0;
  border: var(--border);
  border-radius: var(--radius-pill);
  background: var(--white);
  color: var(--black);
  font-family: var(--font);
  font-size: clamp(9px, 4.2cqi, 14px);
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
  transform: scale(1.05);
}

.letter-grid button:hover {
  background: var(--grey-bg);
}

.letter-grid button.active {
  background: var(--orange);
  color: var(--white);
  border-color: var(--black);
}

.letter-grid button.is-punct {
  font-size: clamp(11px, 4.6cqi, 15px);
  font-weight: 600;
}

/* ─── Pills & toggles ───────────────────────────────────────────────────── */

.pill {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 8px 14px;
  border: var(--border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  color: var(--black);
  background: var(--white);
  user-select: none;
  transition: background 0.12s, color 0.12s;
}

.pill input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.pill:has(input:checked) {
  background: var(--orange);
  color: var(--white);
}

/* ─── Canvas area ───────────────────────────────────────────────────────── */

.canvas-wrap {
  grid-area: canvas;
  position: relative;
  overflow: hidden;
  background: var(--white);
  min-height: 0;
  height: 100%;
  min-width: 0;
  touch-action: none;
}

.canvas-wrap.is-panning {
  cursor: grabbing;
}

.canvas-wrap.can-pan {
  cursor: grab;
}

#p5-container {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
}

#p5-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.view-zoom {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-pill);
}

.view-zoom-btn {
  width: 28px;
  height: 28px;
  padding: 0;
  border: var(--border);
  border-radius: var(--radius-pill);
  background: var(--white);
  color: var(--black);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background 0.12s;
}

.view-zoom-btn:hover {
  background: var(--grey-bg);
}

.view-zoom-reset {
  font-size: 14px;
  margin-left: 2px;
}

.view-zoom-val {
  min-width: 42px;
  text-align: center;
  font-size: 11px;
  font-weight: 500;
  color: var(--grey);
  user-select: none;
}

.canvas-foot {
  position: absolute;
  bottom: var(--canvas-chrome-bottom);
  left: 0;
  right: 0;
  z-index: 20;
  pointer-events: none;
}

.status {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 16px;
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-pill);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  color: var(--grey);
  pointer-events: none;
  white-space: nowrap;
  max-width: calc(100% - 2rem);
  overflow: hidden;
  text-overflow: ellipsis;
}

.canvas-foot .canvas-credit {
  position: absolute;
  right: 16px;
  bottom: 0;
}

.canvas-corner {
  position: absolute;
  bottom: calc(16px + 14px + 8px);
  right: 16px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  pointer-events: none;
  user-select: none;
}

.pendulum-preview {
  position: relative;
  width: 168px;
  height: 126px;
  border: none;
  background: var(--white);
  overflow: hidden;
  flex-shrink: 0;
}

.pendulum-preview::after {
  content: "";
  position: absolute;
  inset: 6px;
  z-index: 2;
  pointer-events: none;
  --corner-len: 18px;
  --corner-w: 3px;
  background:
    linear-gradient(var(--orange), var(--orange)) 0 0 / var(--corner-len) var(--corner-w) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 0 0 / var(--corner-w) var(--corner-len) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 100% 0 / var(--corner-len) var(--corner-w) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 100% 0 / var(--corner-w) var(--corner-len) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 0 100% / var(--corner-len) var(--corner-w) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 0 100% / var(--corner-w) var(--corner-len) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 100% 100% / var(--corner-len) var(--corner-w) no-repeat,
    linear-gradient(var(--orange), var(--orange)) 100% 100% / var(--corner-w) var(--corner-len) no-repeat;
}

.pendulum-preview[hidden] {
  display: none !important;
}

.pendulum-preview-canvas,
#pendulum-preview-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.canvas-credit {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--grey);
  line-height: 1;
  margin: 0;
}

/* ─── Responsive ────────────────────────────────────────────────────────── */

@container panel (max-height: 700px) {
  .panel-inner {
    padding: 8px var(--panel-pad-x) var(--panel-pad-bottom);
    gap: 5px;
  }

  .card {
    padding: 8px;
    gap: 6px;
  }
}

@container panel (max-height: 580px) {
  .section {
    gap: 3px;
  }

  .text-in,
  .select-in {
    padding: 7px 10px;
    font-size: 13px;
  }
}

@container panel (max-height: 460px) {
  .panel-inner {
    gap: 3px;
  }

  .card {
    padding: 6px;
    gap: 5px;
  }
}

@media (max-height: 700px) and (min-width: 721px) {
  :root {
    --head-pad-y: 6px;
  }

  .topbar-main {
    padding: var(--head-pad-top) 14px var(--head-pad-y);
  }
}

/* Large tablets / small laptops */
@media (max-width: 1100px) and (min-width: 721px) {
  :root {
    --panel-w: clamp(248px, 28vw, 300px);
  }
}

/* Tablet — top bar wraps before side-by-side breaks */
@media (max-width: 900px) and (min-width: 721px) {
  :root {
    --panel-w: clamp(236px, 34vw, 280px);
  }

  .topbar-main {
    flex-wrap: wrap;
    row-gap: 8px;
    padding: var(--head-pad-top) 12px var(--head-pad-y);
  }

  .topbar-about {
    order: 3;
    flex: 1 1 100%;
    max-width: none;
    font-size: clamp(8.5px, 1.05vw, 9.5px);
    line-height: 1.35;
  }

  .topbar-actions {
    margin-left: auto;
  }

  .letter-grid {
    grid-template-columns: repeat(14, minmax(0, 1fr));
  }
}

/* Tablet / iPad — controls in a row under the header */
@media (min-width: 721px) and (max-width: 1024px) {
  :root {
    --head-title-w: clamp(236px, 29vw, 300px);
    --head-pad-top: 9px;
    --head-pad-y: 9px;
    --btn-topbar-size: 10px;
  }

  .app-head {
    grid-template-columns: var(--head-title-w) minmax(0, 1fr);
  }

  .app-head-title {
    padding: var(--head-pad-top) 10px var(--head-pad-y) 12px;
    align-items: center;
  }

  .app-head-title .panel-title {
    font-size: clamp(12px, 8cqi, 23px);
    letter-spacing: clamp(-0.02em, 0.08cqi, 0.02em);
  }

  .topbar-main {
    flex-wrap: nowrap;
    align-items: center;
    gap: 8px;
    padding: var(--head-pad-top) 10px var(--head-pad-y) 8px;
  }

  .topbar-about {
    order: unset;
    flex: 1 1 auto;
    min-width: 0;
    max-width: none;
    font-size: clamp(7.5px, 0.82vw, 9px);
    line-height: 1.4;
    text-wrap: pretty;
    white-space: normal;
  }

  .topbar-actions {
    flex-shrink: 0;
    margin-left: 0;
    gap: 5px;
  }

  .btn-topbar {
    min-height: 28px;
    padding: 0 11px;
    font-size: var(--btn-topbar-size);
  }

  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto minmax(0, 1fr);
    grid-template-areas:
      "head"
      "panel"
      "canvas";
  }

  .panel-column {
    grid-area: panel;
    height: auto;
    border-right: none;
    border-bottom: var(--border);
  }

  .panel {
    height: auto;
    container-type: inline-size;
    overflow: visible;
  }

  .panel-sheet {
    height: auto;
  }

  .panel-inner {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-template-rows: auto;
    align-items: stretch;
    gap: var(--panel-section-gap);
    padding: 10px 14px 12px;
    overflow: visible;
  }

  .panel-settings-body {
    display: contents;
  }

  .section {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
    min-height: 0;
    align-self: stretch;
  }

  .section-label {
    font-size: 13px;
    flex-shrink: 0;
    line-height: 1.1;
  }

  .section-text .compose-slot-panel {
    flex-shrink: 0;
  }

  .section > .card,
  .section > .card-stack {
    flex: 1 1 auto;
    min-height: 0;
    height: 100%;
    padding: 8px;
    gap: 5px;
    overflow: visible;
  }

  .section > .card-stack {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
  }

  .section-text .card {
    padding: 8px;
    overflow: visible;
    height: 100%;
  }

  .letter-grid {
    grid-template-columns: repeat(10, minmax(0, 1fr));
    gap: 2px;
    overflow: visible;
  }

  .letter-grid button {
    font-size: 11px;
  }

  .card-stack {
    justify-content: flex-start;
    gap: 5px;
  }

  .grid-2,
  .color-row,
  .pen-pendulum-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .section .card.grid-2 {
    height: 100%;
    grid-template-rows: repeat(6, auto);
    align-content: space-between;
    row-gap: 0;
    padding: 7px 8px;
  }

  .section .card.grid-2 .field {
    gap: 2px;
  }

  .section .card.grid-2 .field-top {
    min-height: 11px;
    gap: 4px;
  }

  .section .card.grid-2 .field-top .val {
    font-size: 11px;
  }

  .section .card.grid-2 input[type="range"] {
    height: 8px;
  }

  .section .card.grid-2 input[type="range"]::-webkit-slider-thumb {
    width: 10px;
    height: 10px;
    margin-top: -5px;
  }

  .field {
    gap: 3px;
  }

  input[type="range"] {
    height: 14px;
  }

  input[type="range"]::-webkit-slider-thumb {
    margin-top: -6px;
  }

  .pen-pendulum-row {
    align-items: stretch;
  }

  .field-pendulum-toggle .field-top {
    min-height: 18px;
  }

  .field-pendulum-toggle .pendulum-switch-wrap {
    display: flex;
    align-items: center;
    min-height: 26px;
  }

  .text-in {
    padding: 8px 10px;
    font-size: 15px;
  }

  .field-top {
    gap: 4px;
    min-height: 14px;
  }

  .field-top > span:first-child {
    flex: 1 1 auto;
    min-width: 0;
  }

  .field-top .val {
    flex: 0 1 auto;
    font-size: 12px;
    max-width: 52%;
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .swatch {
    padding: 7px 8px;
  }

  .swatch input[type="color"] {
    width: 22px;
    height: 22px;
  }

  .canvas-foot {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    height: 0;
    overflow: visible;
  }

  .canvas-theme-picker {
    position: absolute;
    left: max(12px, env(safe-area-inset-left, 0px));
    bottom: max(12px, env(safe-area-inset-bottom, 0px));
    top: auto;
    transform: none;
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 5px;
    max-width: none;
    width: auto;
    z-index: 25;
    pointer-events: auto;
  }

  .canvas-theme-picker .theme-option {
    min-width: 74px;
    min-height: 24px;
    padding: 0 10px;
    justify-content: center;
    font-size: 9px;
  }

  .status {
    bottom: max(12px, env(safe-area-inset-bottom, 0px));
  }

  .canvas-foot .canvas-credit {
    bottom: max(12px, env(safe-area-inset-bottom, 0px));
  }
}

/* Mobile portrait — canvas + bottom compose bar + settings sheet */
@media (max-width: 720px) {
  :root {
    --panel-w: 100%;
    --panel-pad-x: 10px;
    --panel-pad-y: 10px;
    --panel-pad-bottom: 16px;
    --head-pad-y: 10px;
    --head-pad-top: 12px;
    --mobile-compose-h: calc(58px + env(safe-area-inset-bottom, 0px));
    --mobile-head-h: calc(64px + env(safe-area-inset-top, 0px));
    --head-title-w: minmax(0, 1fr);
  }

  .app {
    padding:
      env(safe-area-inset-top, 0)
      env(safe-area-inset-right, 0)
      0
      env(safe-area-inset-left, 0);
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas:
      "head"
      "canvas"
      "compose";
  }

  .panel-column {
    display: contents;
  }

  .compose-slot-panel {
    display: none;
  }

  .compose-bar {
    grid-area: compose;
    z-index: 400;
    padding: 8px var(--panel-pad-x) max(8px, env(safe-area-inset-bottom, 0));
    border-top: var(--border);
    border-bottom: none;
    background: var(--white);
  }

  .app-head {
    position: relative;
    z-index: 350;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: stretch;
    min-height: var(--mobile-head-h);
    background: var(--white);
  }

  .app-head-title {
    min-width: 0;
    overflow: hidden;
    border-right: var(--border);
    border-bottom: none;
    padding: var(--head-pad-top) 8px var(--head-pad-y) var(--panel-pad-x);
    align-items: center;
    justify-content: flex-start;
  }

  .app-head-title .panel-title {
    font-size: clamp(13px, 10.5cqi, 22px);
    letter-spacing: -0.02em;
    line-height: 1;
    text-align: left;
    white-space: nowrap;
  }

  .topbar {
    display: flex;
    flex-shrink: 0;
    min-width: 0;
    min-height: auto;
    width: auto;
  }

  .topbar-main {
    display: flex;
    flex: 0 0 auto;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    padding: var(--head-pad-top) 8px var(--head-pad-y) 6px;
    height: 100%;
    min-width: 0;
    width: auto;
  }

  .topbar-about,
  .topbar-main .topbar-about {
    display: none !important;
  }

  .topbar-actions {
    display: flex;
    flex: 0 0 auto;
    margin-left: auto;
    gap: 6px;
    min-width: 0;
    width: auto;
  }

  .btn-topbar {
    flex: 0 0 auto;
    min-width: 0;
    min-height: 30px;
    padding: 0 12px;
    font-size: 11px;
  }

  .panel {
    display: none;
    position: fixed;
    top: var(--mobile-head-h);
    right: 0;
    bottom: var(--mobile-compose-h);
    left: 0;
    z-index: 380;
    height: auto;
    border: none;
    background: transparent;
    overflow: hidden;
    pointer-events: none;
  }

  body.mobile-settings-open .panel {
    display: block;
  }

  .panel-sheet {
    position: absolute;
    inset: 0;
    max-height: none;
    background: var(--white);
    border: none;
    box-shadow: none;
    transform: translateY(100%);
    transition: transform 0.28s ease;
    pointer-events: auto;
  }

  body.mobile-settings-open {
    overflow: hidden;
  }

  body.mobile-settings-open .panel-sheet {
    transform: translateY(0);
    border-top: var(--border);
    border-bottom: none;
  }

  .panel-settings-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: -1;
    border: none;
    padding: 0;
    margin: 0;
    background: var(--overlay);
    opacity: 0;
    transition: opacity 0.28s ease;
    cursor: pointer;
  }

  body.mobile-settings-open .panel-settings-backdrop {
    opacity: 1;
  }

  .panel-inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 100%;
    overflow-y: auto;
    overscroll-behavior: contain;
    justify-content: flex-start;
    gap: var(--panel-section-gap);
    padding: var(--panel-pad-y) var(--panel-pad-x) var(--panel-pad-bottom);
    background: var(--white);
  }

  .panel-settings-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-shrink: 0;
  }

  .panel-settings-head .section-label {
    margin: 0;
    font-family: var(--font);
    font-size: clamp(12px, 3.8vw, 18px);
    font-weight: 500;
    letter-spacing: clamp(0, 0.2vw, 0.006em);
    line-height: 1;
    text-transform: uppercase;
    color: var(--black);
    padding-left: 0;
  }

  .panel-settings-body {
    display: flex;
    flex-direction: column;
    gap: var(--panel-section-gap);
    flex-shrink: 0;
  }

  .panel-settings-about {
    display: block;
    flex-shrink: 0;
    width: 100%;
    max-width: 100%;
    margin: auto 0 0;
    padding: 16px 0 0;
    border-top: var(--border);
    font-family: var(--font-ui);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.45;
    color: var(--grey);
    text-wrap: pretty;
    white-space: normal;
  }

  .section-text {
    display: none;
  }

  body.mobile-settings-open .section-text {
    display: flex;
  }

  .btn-menu {
    display: inline-flex;
  }

  .section {
    flex-shrink: 0;
  }

  .grid-2 {
    gap: 8px 10px;
  }

  .card-stack {
    gap: 8px;
  }

  .font-picker-list {
    max-height: min(240px, 36vh);
  }

  input[type="range"] {
    height: 22px;
  }

  input[type="range"]::-webkit-slider-thumb {
    width: 16px;
    height: 16px;
    margin-top: -7.5px;
  }

  input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
  }

  .canvas-wrap {
    position: relative;
    z-index: 1;
    isolation: isolate;
    display: block;
    padding-bottom: 0;
    overflow: hidden;
    min-height: max(1px, calc(100dvh - var(--mobile-head-h) - var(--mobile-compose-h)));
    height: 100%;
    grid-area: canvas;
    grid-row: 2;
  }

  #p5-container {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    min-height: 1px;
  }

  #p5-container canvas {
    position: relative;
    z-index: 0;
  }

  .canvas-foot {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    height: 0;
    overflow: visible;
    padding: 0;
    border: none;
    background: transparent;
    pointer-events: none;
    z-index: 25;
  }

  .canvas-theme-picker {
    display: none;
  }

  .view-zoom {
    top: max(10px, env(safe-area-inset-top, 0));
    right: max(10px, env(safe-area-inset-right, 0));
    padding: 2px;
    gap: 2px;
  }

  .view-zoom-btn {
    width: 22px;
    height: 22px;
    font-size: 12px;
  }

  .view-zoom-val {
    min-width: 32px;
    font-size: 9px;
  }

  .status {
    position: absolute;
    left: max(8px, env(safe-area-inset-left, 0px));
    right: auto;
    bottom: max(6px, env(safe-area-inset-bottom, 0px));
    flex: none;
    min-width: 0;
    transform: none;
    text-align: left;
    width: fit-content;
    max-width: calc(100% - 96px - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px));
    padding: 6px 12px;
    margin: 0;
    background: var(--white);
    border: var(--border);
    border-radius: var(--radius-pill);
    font-size: 10px;
    font-weight: 400;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: none;
  }

  .canvas-foot .canvas-credit {
    position: absolute;
    left: auto;
    right: max(8px, env(safe-area-inset-right, 0px));
    bottom: max(6px, env(safe-area-inset-bottom, 0px));
    flex: none;
    max-width: 38%;
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: none;
  }

  .canvas-corner {
    display: none;
  }

  .pendulum-preview {
    display: none !important;
  }

  .canvas-credit {
    font-size: 7px;
    letter-spacing: 0.02em;
    padding: 0;
    margin: 0;
    line-height: 1;
    white-space: nowrap;
  }
}

/* Small phones */
@media (max-width: 420px) {
  :root {
    --panel-pad-x: 8px;
    --head-pad-y: 8px;
    --head-pad-top: 10px;
  }

  .topbar-main {
    gap: 6px;
    padding: var(--head-pad-top) 8px var(--head-pad-y);
  }

  .topbar-actions {
    gap: 4px;
  }

  .topbar-actions .btn-topbar {
    min-height: 28px;
    padding: 0 10px;
    font-size: 10px;
  }

  .app-head-title .panel-title {
    font-size: clamp(12px, 9.5cqi, 20px);
  }

  .btn-menu {
    width: 38px;
  }

  .swatch {
    padding: 6px 8px;
  }

  .swatch input[type="color"] {
    width: 22px;
    height: 22px;
  }

  .switch-wide .switch-thumb-text {
    font-size: 8px;
  }
}

/* Tablet landscape — keep side-by-side (not phone mobile layout) */
@media (min-width: 721px) and (max-width: 900px) and (orientation: landscape) and (max-height: 520px) {
  :root {
    --panel-w: clamp(200px, 30vw, 280px);
    --head-pad-y: 5px;
  }

  .topbar-main {
    flex-wrap: nowrap;
    padding: var(--head-pad-top) 10px var(--head-pad-y);
    gap: 8px;
  }

  .topbar-about {
    order: unset;
    flex: 1;
    font-size: clamp(7.5px, 1.4vw, 9px);
    line-height: 1.3;
  }

  .btn-topbar {
    min-height: 32px;
    padding: 0 14px;
    font-size: var(--btn-topbar-size);
  }

  .app {
    grid-template-columns: minmax(200px, 30vw) 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "head head"
      "panel canvas";
  }

  .app-head-title {
    padding-bottom: 2px;
  }

  .panel-column {
    border-right: var(--border);
    border-bottom: none;
  }

  .panel {
    height: 100%;
  }

  .panel-inner {
    gap: 4px;
    padding-bottom: 12px;
  }

  .letter-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .section-label {
    font-size: clamp(12px, 3.5cqh, 15px);
  }
}