:root {
  --bg: #E8E6E1;
  --panel: #F3F2EE;
  --card: #FCFBF8;
  --line: #DAD7D0;
  --line-strong: #C9C5BD;
  --ink: #1F2526;
  --ink-2: #5B625F;
  --ink-3: #868C88;
  --dark: #252B2F;
  --green: #506A67;
  --green-hover: #445C59;
  --sage: #8AA98A;
  --tag-bg: #F6E6CC;
  --tag-ink: #94672C;
  --night: #141A1A;
  --radius: 14px;
  --font: 'Lexend', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: light;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.45;
  font-weight: 400;
}

button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

h1, h2 { margin: 0; font-weight: 500; letter-spacing: -0.01em; }
h2 { font-size: 1.28rem; }
p { margin: 0; }

.muted { color: var(--ink-2); font-size: 0.86rem; }
.small { font-size: 0.8rem; }

.app {
  max-width: 1480px;
  margin: 0 auto;
  padding: 28px 32px 24px;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.title {
  font-size: clamp(2rem, 3.5vw, 3.35rem);
  line-height: 1.04;
  font-weight: 400;
  letter-spacing: -0.02em;
  max-width: 13.5em;
  text-wrap: balance;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  padding-bottom: 6px;
}
.brand img { border-radius: 4px; display: block; }
.brand strong { display: block; font-weight: 500; font-size: 0.95rem; }
.brand span { color: var(--ink-2); font-size: 0.86rem; }

/* ---------- layout ---------- */

.studio {
  display: grid;
  grid-template-columns: minmax(0, 1.72fr) minmax(340px, 1fr);
  gap: 28px;
  align-items: start;
}

/* ---------- room viewer ---------- */

.viewer {
  --aspect: 1263 / 950;
  --ratio: 1.3295;
  position: relative;
  aspect-ratio: var(--aspect);
  border-radius: 12px;
  overflow: hidden;
  background: #D6D2CA;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.06), 0 12px 32px -18px rgb(20 26 26 / 0.45);
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

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

.highlight {
  pointer-events: none;
  opacity: 0;
}
.highlight.flash { animation: flash 0.9s ease-out; }
@keyframes flash {
  0% { opacity: 0; }
  25% { opacity: 0.5; }
  100% { opacity: 0; }
}

.compare { position: absolute; inset: 0; }
.compare[hidden] { display: none; }
.compare-half { position: absolute; inset: 0; }
.compare-right { clip-path: inset(0 0 0 50%); }
.compare::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  margin-left: -1px;
  background: rgb(255 255 255 / 0.85);
  box-shadow: 0 0 6px rgb(0 0 0 / 0.3);
}

.viewer-tag {
  position: absolute;
  top: 14px;
  z-index: 2;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgb(20 26 26 / 0.78);
  color: #fff;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  backdrop-filter: blur(4px);
}
.viewer-tag[hidden] { display: none; }
.tag-left { left: 14px; }
.tag-right { right: 14px; }

.hover-label {
  position: absolute;
  z-index: 3;
  transform: translate(14px, 14px);
  padding: 5px 10px;
  border-radius: 8px;
  background: rgb(20 26 26 / 0.86);
  color: #fff;
  font-size: 0.78rem;
  white-space: nowrap;
  pointer-events: none;
}
.hover-label[hidden] { display: none; }

.loading {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: #D6D2CA;
  color: var(--ink-2);
  font-size: 0.9rem;
}
.loading[hidden] { display: none; }
.spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgb(31 37 38 / 0.2);
  border-top-color: var(--ink);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hint {
  margin: 10px 2px 14px;
  color: var(--ink-2);
  font-size: 0.84rem;
}

/* ---------- controls ---------- */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.94rem;
}
.toolbar .push { margin-left: auto; }

.segmented {
  display: inline-flex;
  padding: 3px;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
}
.segmented button {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 8px 16px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.segmented button:hover { background: rgb(31 37 38 / 0.06); }
.segmented button[aria-pressed="true"] { background: var(--dark); color: #fff; }
.segmented.wide { display: flex; }
.segmented.wide button { flex: 1; padding: 10px 8px; }
.segmented.small button { padding: 5px 12px; font-size: 0.84rem; }

.pill {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 9px 16px;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  touch-action: manipulation;
}
.pill:hover { border-color: var(--line-strong); background: #fff; }
.pill.primary { background: var(--green); border-color: var(--green); color: #fff; }
.pill.primary:hover { background: var(--green-hover); }
.pill.small { padding: 5px 13px; font-size: 0.84rem; }
.pill:disabled { opacity: 0.6; cursor: progress; }
.pill.hold { user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; touch-action: none; }
.pill.hold.is-held { background: var(--dark); border-color: var(--dark); color: #fff; }

.text-link {
  display: inline-block;
  border: 0;
  background: none;
  padding: 0;
  color: var(--ink);
  font-size: 0.84rem;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgb(31 37 38 / 0.4);
}
.text-link:hover { text-decoration-color: var(--ink); }

.tag-optional {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-ink);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  vertical-align: 1px;
  white-space: nowrap;
}

/* ---------- scheme summary ---------- */

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.summary-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  border: 0;
  background: none;
  padding: 0;
  text-align: left;
}
.summary-swatch {
  width: 100%;
  height: 40px;
  margin-bottom: 6px;
  border-radius: 6px;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.07);
  transition: transform 0.15s;
}
.summary-item:hover .summary-swatch { transform: translateY(-2px); }
.summary-label { color: var(--ink-3); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; }
.summary-label .tag-optional { text-transform: none; letter-spacing: 0.02em; }
.summary-item strong { font-weight: 500; font-size: 0.95rem; }
.summary-number { color: var(--ink-2); font-size: 0.8rem; }
.summary-match { color: var(--ink-3); font-size: 0.74rem; font-style: italic; }

.guide-note {
  margin-top: 18px;
  color: var(--ink-3);
  font-size: 0.8rem;
}

/* ---------- side panel ---------- */

.panel {
  position: sticky;
  top: 20px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 4px 22px 22px;
  scrollbar-width: thin;
}

.panel-section { padding: 20px 0 22px; border-bottom: 1px solid var(--line); }
.panel-section:last-child { border-bottom: 0; padding-bottom: 0; }
.panel-section > h2, .section-head { margin-bottom: 14px; }
.panel-section > .muted { margin: -6px 0 12px; }
.panel-section > .text-link { margin-top: 12px; }

.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }

.provisional {
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--tag-bg);
  color: #6F4E22;
  font-size: 0.8rem;
}
.provisional[hidden] { display: none; }

/* surfaces */

.surfaces { display: flex; flex-direction: column; gap: 4px; }

.surface-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-right: 8px;
  border: 1px solid transparent;
  border-radius: 12px;
  transition: border-color 0.15s, background 0.15s;
}
.surface-row.is-active { border-color: var(--ink); background: #fff; }
.surface-row:not(.is-active):hover { background: rgb(255 255 255 / 0.55); }

.surface-main {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 0;
  background: none;
  padding: 9px 4px 9px 10px;
  text-align: left;
}
.dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.1);
}
.surface-name { flex: 1; min-width: 0; font-size: 0.95rem; }
.surface-colour {
  color: var(--ink-2);
  font-size: 0.8rem;
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 45%;
}
.surface-row.is-off .surface-name,
.surface-row.is-off .surface-colour,
.surface-row.is-off .dot { opacity: 0.55; }
.surface-row.is-off .tag-optional { opacity: 1; }

.toggle-pill {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 0.82rem;
  white-space: nowrap;
}
.toggle-pill[aria-pressed="true"] { background: var(--dark); border-color: var(--dark); color: #fff; }

.sub-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 2px 8px 8px 48px;
}
.sub-label { color: var(--ink-2); font-size: 0.84rem; }

/* colour picker */

.search input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}
.search input::placeholder { color: var(--ink-3); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 14px; }
.chip {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 4px 11px;
  font-size: 0.78rem;
}
.chip:hover { border-color: var(--line-strong); }
.chip[aria-pressed="true"] { background: var(--dark); border-color: var(--dark); color: #fff; }

.swatches {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
  gap: 12px 10px;
  max-height: 372px;
  overflow-y: auto;
  padding: 4px 4px 4px 2px;
  margin: 0 -4px 0 -2px;
  scrollbar-width: thin;
}
.swatch {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 0;
  background: none;
  padding: 0;
  text-align: left;
  min-width: 0;
}
.chip-colour {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  margin-bottom: 5px;
  border-radius: 8px;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.08);
  transition: transform 0.12s;
}
.swatch:hover .chip-colour { transform: scale(1.04); }
.swatch.is-selected .chip-colour { outline: 2px solid var(--ink); outline-offset: 2px; }
.swatch-name {
  font-size: 0.76rem;
  font-weight: 500;
  line-height: 1.25;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.swatch-number { color: var(--ink-3); font-size: 0.7rem; }
.empty { grid-column: 1 / -1; padding: 12px 0; }

/* schemes */

.schemes { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.scheme {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 8px 8px 9px;
  text-align: left;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.scheme:hover { border-color: var(--line-strong); }
.scheme.is-active { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.strip {
  display: flex;
  height: 16px;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgb(0 0 0 / 0.06);
}
.scheme-name { font-size: 0.86rem; }

/* ---------- toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 50;
  transform: translate(-50%, 16px);
  opacity: 0;
  pointer-events: none;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--dark);
  color: #fff;
  font-size: 0.88rem;
  box-shadow: 0 10px 30px -12px rgb(0 0 0 / 0.5);
  transition: opacity 0.2s, transform 0.2s;
  max-width: calc(100vw - 32px);
  text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- dialogs ---------- */

.sheet {
  width: min(960px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  border: 0;
  border-radius: 18px;
  padding: 24px;
  background: var(--panel);
  color: var(--ink);
  box-shadow: 0 30px 80px -30px rgb(0 0 0 / 0.55);
}
.sheet::backdrop { background: rgb(20 26 26 / 0.5); backdrop-filter: blur(3px); }
.sheet-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 6px; }
.close {
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--ink-2);
}
.close:hover { background: rgb(31 37 38 / 0.07); color: var(--ink); }

.save-layout { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 26px; align-items: start; }

.save-preview {
  container-type: inline-size;
  display: grid;
  grid-template-columns: 62% 38%;
  aspect-ratio: 297 / 210;
  border-radius: 10px;
  overflow: hidden;
  background: var(--night);
  box-shadow: 0 12px 30px -16px rgb(0 0 0 / 0.5);
}
.save-preview > img { width: 100%; height: 100%; object-fit: cover; object-position: 42% 50%; display: block; }
.preview-panel {
  display: flex;
  flex-direction: column;
  padding: 4.5cqi 4cqi 3.5cqi;
  color: #F1EDE4;
  min-width: 0;
}
.preview-wordmark { width: 9.5cqi; margin-bottom: 3cqi; }
.preview-kicker { font-size: 1.5cqi; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: #8FAE96; }
.preview-title { font-size: 3.6cqi; line-height: 1.12; font-weight: 600; margin: 0.8cqi 0 0.6cqi; }
.preview-for { font-size: 1.5cqi; color: #9DA6A2; min-height: 1.5cqi; }
.preview-list { list-style: none; margin: 2.4cqi 0 0; padding: 0; display: flex; flex-direction: column; gap: 1.6cqi; }
.preview-list li { display: flex; gap: 1.6cqi; align-items: flex-start; }
.preview-swatch { width: 4.4cqi; height: 4.4cqi; flex-shrink: 0; border: 1px solid #3A4242; }
.preview-list small { display: block; font-size: 1.1cqi; letter-spacing: 0.1em; text-transform: uppercase; color: #8FAE96; font-weight: 600; }
.preview-list b { display: block; font-size: 1.9cqi; font-weight: 600; line-height: 1.2; }
.preview-list em { display: block; font-style: normal; font-size: 1.2cqi; color: #9DA6A2; }
.preview-foot { margin-top: auto; font-size: 1.15cqi; color: #9DA6A2; border-top: 1px solid #2E3636; padding-top: 1.4cqi; }

.save-form { display: flex; flex-direction: column; gap: 14px; }
.save-form > .pill { align-self: flex-start; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field span { color: var(--ink-2); font-size: 0.84rem; }
.field input, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
}
.field input:focus { border-color: var(--ink); }
.field textarea { font-size: 0.8rem; line-height: 1.5; resize: vertical; color: var(--ink-2); }
.row-buttons { display: flex; flex-wrap: wrap; gap: 8px; }

.boards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.board {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
}
.board.is-active { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.board-art svg { display: block; width: 100%; height: auto; aspect-ratio: 640 / 360; }
.board figcaption { display: flex; gap: 16px; padding: 16px; align-items: flex-start; }
.board-section { flex-shrink: 0; width: 46px; }
.board-section svg { display: block; width: 46px; height: auto; }
.board strong { font-weight: 500; font-size: 1.05rem; }
.board .muted { margin: 4px 0 12px; }

/* ---------- footer ---------- */

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 0.78rem;
}

/* ---------- narrow screens: the room stays pinned while you choose ---------- */

@media (max-width: 1100px) {
  .studio { grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr); gap: 20px; }
  .toolbar .push { margin-left: 0; }
}

@media (max-width: 860px) {
  .app { padding: 16px 16px 20px; }
  .masthead { flex-direction: column-reverse; align-items: flex-start; gap: 14px; margin-bottom: 16px; }
  .title { font-size: clamp(1.7rem, 7vw, 2.3rem); }
  .brand img { width: 36px; height: 36px; }
  .brand { padding: 0; }

  .studio { display: flex; flex-direction: column; align-items: stretch; gap: 0; }
  .stage { display: contents; }
  .viewer-dock {
    position: sticky;
    top: 0;
    z-index: 10;
    margin: 0 -16px;
    padding: 8px 16px;
    background: var(--bg);
  }
  .viewer { width: min(100%, calc(40vh * var(--ratio))); margin: 0 auto; border-radius: 10px; }
  .hint { margin: 4px 2px 12px; }
  .toolbar { gap: 8px; }
  .toolbar .pill, .segmented button { padding: 8px 13px; font-size: 0.86rem; }
  .summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .guide-note { margin-bottom: 18px; }

  .panel { position: static; max-height: none; overflow: visible; padding: 0 16px 18px; }
  .swatches { max-height: 330px; grid-template-columns: repeat(auto-fill, minmax(78px, 1fr)); }
  .sub-row { padding-left: 10px; }

  .sheet { padding: 18px; }
  .save-layout, .boards { grid-template-columns: 1fr; }
  .save-preview { order: 2; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}