/* ============================================================
   COLOUR THEORY TOOL — /colour-theory/
   ============================================================ */

body::after {
  background:
    radial-gradient(ellipse 110% 50% at 18% -6%,  rgba(220,70,60,  0.13) 0%, transparent 55%),
    radial-gradient(ellipse 70%  45% at 82% -6%,  rgba(60,80,220,  0.11) 0%, transparent 55%),
    radial-gradient(ellipse 50%  40% at  4% 93%,  rgba(240,180,30, 0.08) 0%, transparent 55%),
    radial-gradient(ellipse 40%  35% at 96% 88%,  rgba(30,190,130, 0.07) 0%, transparent 50%);
}

/* ─── Tab navigation ─────────────────────────────────────── */
.ct-tabs {
  display: flex;
  gap: .5rem;
  justify-content: center;
  padding: 1.5rem 1.5rem 0;
  flex-wrap: wrap;
  width: 100%;
  max-width: 960px;
  align-self: center;
}
.ct-tab {
  padding: .5rem 1.3rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--border2);
  background: var(--bg2);
  color: var(--text2);
  font-size: .86rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}
.ct-tab:hover  { background: var(--bg3); color: var(--text); }
.ct-tab.active { background: var(--gold-dim); border-color: var(--gold); color: var(--gold); }

/* ─── Tab panels ─────────────────────────────────────────── */
.ct-panel { display: none; width: 100%; max-width: 960px; align-self: center; padding: 2.25rem 0 5rem; }
.ct-panel.active { display: block; }

/* ─── Section heading ────────────────────────────────────── */
.ct-sh {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--border);
  margin: 2.25rem 0 1.25rem;
}
.ct-sh:first-child { margin-top: 0; }

/* ─── Picker groups ──────────────────────────────────────── */
.ct-pickers { display: flex; gap: 1.25rem; flex-wrap: wrap; align-items: flex-end; margin-bottom: 1.5rem; }
.ct-picker-group { display: flex; flex-direction: column; gap: .45rem; flex: 1; min-width: 110px; }
.ct-lbl { font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.ct-swatch {
  width: 100%; height: 68px; border-radius: var(--r-md);
  border: 1px solid var(--border2); cursor: pointer;
  transition: transform .14s ease;
}
.ct-swatch:hover { transform: scale(1.04); }
.ct-hex { font-size: .78rem; color: var(--muted); font-family: monospace; letter-spacing: .04em; }

/* ─── Ratio slider ────────────────────────────────────────── */
.ct-ratio-wrap { display: flex; flex-direction: column; gap: .45rem; flex: 2; min-width: 160px; padding-bottom: .2rem; }
.ct-ratio-ends { display: flex; justify-content: space-between; font-size: .72rem; color: var(--muted); }
input[type=range].ct-range { width: 100%; height: 4px; accent-color: var(--gold); cursor: pointer; }

/* ─── Mix results ────────────────────────────────────────── */
.ct-results { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1.25rem; }
.ct-result-box { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--r-md); overflow: hidden; }
.ct-result-swatch { width: 100%; height: 84px; }
.ct-result-body { padding: .8rem 1rem; }
.ct-result-title { font-size: .68rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--gold); margin-bottom: .3rem; }
.ct-result-hex { font-size: 1rem; font-family: monospace; color: var(--text); letter-spacing: .08em; margin-bottom: .35rem; }
.ct-result-note { font-size: .78rem; color: var(--muted); line-height: 1.65; margin: 0; }

/* ─── Explainer callout ──────────────────────────────────── */
.ct-explainer {
  background: var(--bg2); border-left: 3px solid var(--border2);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: .9rem 1.1rem; margin-bottom: 1.5rem;
}
.ct-explainer p { font-size: .87rem; color: var(--muted); line-height: 1.75; margin: 0; }
.ct-explainer p+p { margin-top: .55rem; }

/* ─── Temperature badges ─────────────────────────────────── */
.ct-badge {
  display: inline-flex; align-items: center; gap: .35rem;
  padding: .28rem .75rem; border-radius: var(--r-pill);
  font-size: .74rem; font-weight: 700; letter-spacing: .06em;
}
.ct-badge.w { background: rgba(220,120,20,.2);  color: #e09040; border: 1px solid rgba(220,120,20,.3); }
.ct-badge.c { background: rgba(60,120,220,.2);  color: #80a8e8; border: 1px solid rgba(60,120,220,.3); }
.ct-badge.n { background: rgba(150,145,140,.2); color: #a09890; border: 1px solid rgba(150,145,140,.25); }

/* ─── Light temp buttons ─────────────────────────────────── */
.ct-light-btns { display: flex; gap: .5rem; flex-wrap: wrap; margin: .75rem 0 1rem; }
.ct-lbtn {
  padding: .4rem 1rem; border-radius: var(--r-pill);
  border: 1px solid var(--border2); background: var(--bg2);
  color: var(--text2); font-size: .83rem; cursor: pointer;
  transition: all .15s;
}
.ct-lbtn:hover  { background: var(--bg3); color: var(--text); }
.ct-lbtn.active { background: var(--gold-dim); border-color: var(--gold); color: var(--gold); }

/* ─── Lighting palette strip ─────────────────────────────── */
.ct-palette { display: flex; gap: .75rem; margin: 1rem 0 1.5rem; }
.ct-pal-swatch { flex: 1; border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--border); }
.ct-pal-color { height: 60px; width: 100%; }
.ct-pal-info { background: var(--bg2); padding: .45rem .7rem; }
.ct-pal-name { font-size: .64rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: .18rem; }
.ct-pal-hex  { font-family: monospace; font-size: .78rem; color: var(--text); }

/* ─── Contrast grid ──────────────────────────────────────── */
.ct-contrast-grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: .9rem; margin: 1.25rem 0;
}
.ct-contrast-cell { border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--border); }
.ct-contrast-bg {
  height: 96px; display: flex; align-items: center; justify-content: center;
}
.ct-contrast-dot {
  width: 56px; height: 56px; border-radius: 50%;
  box-shadow: 0 2px 10px rgba(0,0,0,.45);
}
.ct-contrast-lbl {
  background: var(--bg2); padding: .38rem .7rem;
  font-size: .68rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); text-align: center;
}

/* ─── Notan ──────────────────────────────────────────────── */
.ct-drop {
  border: 2px dashed var(--border2); border-radius: var(--r-lg);
  padding: 3rem 2rem; text-align: center; cursor: pointer;
  transition: border-color .15s, background .15s; margin-bottom: 1.5rem;
}
.ct-drop:hover, .ct-drop.drag { border-color: var(--gold); background: var(--gold-dim); }
.ct-drop p { font-size: .88rem; color: var(--muted); margin-bottom: .4rem; }
.ct-drop strong { color: var(--text2); }

.ct-notan-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; margin: .5rem 0 1rem;
}
.ct-notan-cell { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--r-md); overflow: hidden; }
.ct-notan-cell canvas { width: 100%; height: auto; display: block; }
.ct-notan-cell-lbl {
  padding: .38rem .75rem; font-size: .68rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--muted);
}

.ct-sliders {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--r-md); padding: .9rem 1.1rem; margin-bottom: 1rem;
}
.ct-slider-row { display: flex; align-items: center; gap: .9rem; margin-bottom: .6rem; }
.ct-slider-row:last-child { margin-bottom: 0; }
.ct-slider-lbl { font-size: .76rem; color: var(--muted); min-width: 140px; flex-shrink: 0; }
.ct-slider-val { font-size: .76rem; color: var(--text2); font-family: monospace; min-width: 28px; text-align: right; }

/* ─── Inline notan sliders ───────────────────────────────── */
.ct-notan-sliders {
  padding: .5rem .75rem .6rem;
  border-top: 1px solid var(--border);
}
.ct-notan-sliders .ct-slider-row { margin-bottom: .45rem; }
.ct-notan-sliders .ct-slider-row:last-child { margin-bottom: 0; }
.ct-notan-sliders .ct-slider-lbl { font-size: .7rem; min-width: 120px; }

.ct-new-img-btn {
  padding: .4rem 1rem; border-radius: var(--r-pill);
  border: 1px solid var(--border2); background: var(--bg2);
  color: var(--text2); font-size: .83rem; cursor: pointer;
  margin-bottom: 1rem; transition: all .15s;
}
.ct-new-img-btn:hover { background: var(--bg3); color: var(--text); }

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 700px) {
  .ct-results       { grid-template-columns: 1fr; }
  .ct-contrast-grid { grid-template-columns: 1fr 1fr; }
  .ct-notan-grid    { grid-template-columns: 1fr; }
  .ct-panel         { padding: 1.75rem 0 3rem; }
  .ct-palette       { flex-wrap: wrap; }
  .ct-pal-swatch    { min-width: 120px; }
}
@media (max-width: 480px) {
  .ct-pickers { gap: .9rem; }
  .ct-contrast-grid { grid-template-columns: 1fr 1fr; }
}