/* Trigonometry interactive demos — shared styles.
   Layers on the global /style.css. All widgets are inline SVG + vanilla JS,
   mounted from elements carrying a data-trig="..." attribute. */

:root {
  --sin: #2fbf71;   /* green  — opposite / height */
  --cos: #3b6fe0;   /* blue   — adjacent / sideways */
  --tan: #ff8a3d;   /* orange — tan */
  --tri: #a06bff;   /* purple — triangle accents */
}

.edu-wide { max-width: 820px; }

/* breadcrumb (matches the arithmetic pages) */
.crumbs { font-size: 13px; color: var(--muted); margin: -6px 0 18px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }
.crumbs .sep { opacity: .5; margin: 0 7px; }

/* a demo block */
.trig-demo {
  background: var(--card); border: 1px solid var(--border); border-radius: 18px;
  padding: 18px 18px 20px; margin: 18px 0 26px;
}
.trig-demo h3 { margin: 0 0 4px; font-size: 18px; }
.trig-demo .demo-hint { color: var(--muted); font-size: 14px; margin: 0 0 12px; }

.trig-stage { display: flex; justify-content: center; }
svg.trig-svg {
  width: 100%; height: auto; max-width: 460px; display: block;
  touch-action: none; /* let us handle drag without the page scrolling */
  user-select: none; -webkit-user-select: none;
}
svg.trig-svg.wide { max-width: 560px; }

/* SVG primitives */
.t-axis { stroke: rgba(255,255,255,.16); stroke-width: 1; }
.t-circle { fill: none; stroke: rgba(255,255,255,.22); stroke-width: 1.5; }
.t-grid { stroke: rgba(255,255,255,.07); stroke-width: 1; }
.t-hyp { stroke: var(--muted); stroke-width: 2.5; fill: none; }
.t-sin { stroke: var(--sin); stroke-width: 3.5; fill: none; stroke-linecap: round; }
.t-cos { stroke: var(--cos); stroke-width: 3.5; fill: none; stroke-linecap: round; }
.t-tan { stroke: var(--tan); stroke-width: 2.5; fill: none; stroke-dasharray: 5 4; }
.t-tri { fill: rgba(160,107,255,.12); stroke: var(--tri); stroke-width: 2.5; stroke-linejoin: round; }
.t-arc { fill: none; stroke: var(--ink); stroke-width: 2; }
.t-curve-sin { fill: none; stroke: var(--sin); stroke-width: 3; }
.t-curve-cos { fill: none; stroke: var(--cos); stroke-width: 3; stroke-dasharray: 6 5; }
.t-link { stroke: rgba(255,255,255,.4); stroke-width: 1.5; stroke-dasharray: 4 4; }
.t-label { fill: var(--ink); font-size: 15px; font-weight: 700; font-family: inherit; }
.t-label.muted { fill: var(--muted); font-weight: 600; font-size: 13px; }
.t-side { fill: var(--muted); font-size: 13px; font-weight: 700; }

/* draggable handle */
.t-handle { cursor: grab; }
.t-handle:active { cursor: grabbing; }
.t-handle circle { fill: var(--ink); stroke: var(--bg-bot); stroke-width: 2; }
.t-handle.pulse circle { fill: var(--accent); }
.t-pt { fill: var(--ink); stroke: var(--bg-bot); stroke-width: 2; }

/* radians / identities widgets */
.r-eq { text-align: center; font-size: 21px; font-weight: 700; line-height: 1.5; margin: 14px 0 6px;
  padding: 10px 14px; border-radius: 12px; background: rgba(255,255,255,.04); border: 1px solid var(--border);
  font-variant-numeric: tabular-nums; overflow-x: auto; }
.shape-row { row-gap: 10px; }
.trig-slider.labeled { display: flex; align-items: center; gap: 8px; flex: 1 1 230px; }
.trig-slider.labeled .sl-tag { font-size: 13px; color: var(--ink); min-width: 108px; }
.trig-slider.labeled .sl-tag b { color: var(--sin); }
.trig-slider.labeled .sl-out { min-width: 44px; text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; font-size: 13px; }
.id-rows { display: grid; gap: 8px; margin: 14px 0 4px; }
.id-row { display: grid; grid-template-columns: 1fr auto auto auto; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 12px; background: rgba(255,255,255,.04); border: 1px solid var(--border); }
.id-row .id-name { font-size: 13px; color: var(--muted); }
.id-row .id-left { font-weight: 800; font-variant-numeric: tabular-nums; color: var(--tri); }
.id-row .id-eq { color: var(--muted); }
.id-row .id-right { font-weight: 800; font-variant-numeric: tabular-nums; color: var(--sin); }
@media (max-width: 540px) { .id-row { grid-template-columns: 1fr; gap: 2px; text-align: left; } .id-row .id-eq { display: none; }
  .id-row .id-left::before { content: "→ "; color: var(--muted); font-weight: 400; }
  .id-row .id-right::before { content: "= "; color: var(--muted); font-weight: 400; } }

/* readouts */
.readouts { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 4px; }
.val {
  flex: 1 1 auto; min-width: 92px; text-align: center; padding: 9px 10px;
  border-radius: 12px; background: rgba(255,255,255,.04); border: 1px solid var(--border);
  font-size: 14px; font-weight: 700;
}
.val small { display: block; font-size: 11px; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: .05em; margin-bottom: 2px; }
.val.sin { color: var(--sin); } .val.cos { color: var(--cos); } .val.tan { color: var(--tan); }
.val.angle { color: var(--ink); }
.val.eq { color: var(--tri); }

/* controls */
.trig-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 14px; }
.tbtn {
  appearance: none; cursor: pointer; border: 1px solid var(--border); background: var(--card);
  color: var(--ink); font-size: 14px; font-weight: 650; padding: 9px 14px; border-radius: 10px;
  transition: border-color .12s, background .12s, transform .1s;
}
.tbtn:hover { border-color: var(--accent); transform: translateY(-1px); }
.tbtn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.tbtn.on { border-color: var(--accent); background: var(--accent-soft); }
.snap-row { display: flex; flex-wrap: wrap; gap: 6px; }
.snap { min-width: 46px; }

.trig-slider { flex: 1 1 200px; display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); }
.trig-slider input[type=range] { flex: 1; min-width: 0; width: 0; accent-color: var(--accent); height: 28px; }

.toggle { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; color: var(--ink); cursor: pointer; }
.toggle input { width: 18px; height: 18px; accent-color: var(--accent); }

/* formula display (no MathJax — plain styled HTML) */
.formula { background: rgba(255,255,255,.04); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; margin: 14px 0; font-size: 17px; line-height: 1.9; overflow-x: auto; }
.formula .s { color: var(--sin); } .formula .c { color: var(--cos); } .formula .t { color: var(--tan); }
.formula b { color: var(--accent); }

/* proper stacked fraction (numerator over a bar over denominator), no library */
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; line-height: 1.15; margin: 0 .16em; }
.frac > .num { padding: 0 .5em .06em; }
.frac > .den { padding: .06em .5em 0; border-top: 2px solid currentColor; }
.mn { color: var(--muted); }

/* when-to-use boxes */
.usegrid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
@media (max-width: 540px) { .usegrid { grid-template-columns: 1fr; } }
.usebox { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; background: rgba(255,255,255,.03); }
.usebox h4 { margin: 0 0 6px; font-size: 15px; }
.usebox.good { border-color: rgba(47,191,113,.4); }
.usebox.bad  { border-color: rgba(255,93,108,.35); }

/* live "right angle!" flag for the cosine-rule demo */
.flag { display: inline-block; margin-left: 8px; padding: 2px 8px; border-radius: 999px;
  font-size: 12px; font-weight: 700; background: rgba(47,191,113,.18); color: #8df0b6;
  opacity: 0; transition: opacity .2s; }
.flag.show { opacity: 1; }