/* Tapered cup rotary calculator.
   Every rule is scoped under .rotary-tool so the tool keeps its own look
   (graph-paper panel, its own palette) without leaking into the storefront. */

.rotary-tool {
  --paper: #F4F5F2; --panel: #FFFFFF; --ink: #181B17; --muted: #63675F;
  --line: #DBDED7; --line-2: #C7CBC2;
  --big: #1F6FB2; --big-bg: #E7F0F8; --big-ink: #124B7C;
  --small: #C67A12; --small-bg: #FBEEDA; --small-ink: #8A540A;
  --rt-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --rt-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --r: 10px;

  background: var(--paper);
  color: var(--ink);
  font-family: var(--rt-sans);
  line-height: 1.6;
  font-size: 16px;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: -1px -1px;
  border: 1px solid var(--line-2);
  border-radius: 12px;
  margin: 10px 0 28px;
  overflow: hidden;
}
.rotary-tool * { box-sizing: border-box; }
.rotary-tool .rt-wrap { max-width: 920px; margin: 0 auto; padding: 26px 20px 34px; }
.rotary-tool .rt-head { margin: 0 0 24px; }
.rotary-tool .eyebrow { font-family: var(--rt-mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; }
.rotary-tool h1 { font-size: clamp(26px, 4.4vw, 38px); line-height: 1.12; margin: 0 0 12px; font-weight: 650; letter-spacing: -.01em; color: var(--ink); }
.rotary-tool .lede { font-size: 17px; color: var(--muted); max-width: 60ch; margin: 0; }
.rotary-tool .lede strong { color: var(--ink); font-weight: 600; }

.rotary-tool .presets { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0 18px; }
.rotary-tool .presets button { font-family: var(--rt-sans); font-size: 14px; font-weight: 550; cursor: pointer; background: var(--panel); border: 1px solid var(--line-2); color: var(--ink); padding: 9px 14px; border-radius: 999px; transition: border-color .12s; }
.rotary-tool .presets button:hover { border-color: var(--ink); }
.rotary-tool .presets button:focus-visible { outline: 2px solid var(--big); outline-offset: 2px; }
.rotary-tool .presets .k { font-family: var(--rt-mono); font-size: 12px; color: var(--muted); margin-left: 6px; }

.rotary-tool .stage { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; margin: 0 0 14px; }
.rotary-tool .stage figure { margin: 0; }
.rotary-tool .stage figcaption { font-family: var(--rt-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 0 0 6px; text-align: center; }
.rotary-tool svg { display: block; width: 100%; height: auto; }

.rotary-tool .results { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 0 0 22px; }
.rotary-tool .stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 13px 14px; }
.rotary-tool .stat.hero { border-color: var(--big); background: var(--big-bg); }
.rotary-tool .stat .lab { font-size: 12.5px; color: var(--muted); margin: 0 0 4px; line-height: 1.3; }
.rotary-tool .stat.hero .lab { color: var(--big-ink); }
.rotary-tool .stat .val { font-family: var(--rt-mono); font-size: 23px; font-weight: 600; letter-spacing: -.02em; margin: 0; }
.rotary-tool .stat.hero .val { color: var(--big-ink); }
.rotary-tool .stat .val small { font-size: 13px; font-weight: 500; color: var(--muted); margin-left: 3px; }
.rotary-tool .stat.hero .val small { color: var(--big-ink); opacity: .7; }

.rotary-tool .panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 18px 8px; margin: 0 0 14px; }
.rotary-tool .panel h2 { font-size: 15px; font-weight: 600; margin: 0 0 4px; }
.rotary-tool .panel .sub { font-size: 13.5px; color: var(--muted); margin: 0 0 14px; }

.rotary-tool .seg { display: inline-flex; background: var(--paper); border: 1px solid var(--line-2); border-radius: 8px; padding: 3px; margin: 0 0 16px; }
.rotary-tool .seg label { font-size: 13.5px; font-weight: 550; color: var(--muted); cursor: pointer; margin: 0; }
.rotary-tool .seg input { position: absolute; opacity: 0; pointer-events: none; }
.rotary-tool .seg input:checked + span { background: var(--ink); color: #fff; }
.rotary-tool .seg span { padding: 6px 14px; display: inline-block; border-radius: 6px; }
.rotary-tool .seg label:has(input:focus-visible) span { outline: 2px solid var(--big); outline-offset: 2px; }

.rotary-tool .ctrl { display: grid; grid-template-columns: 170px 1fr 76px; align-items: center; gap: 12px; padding: 9px 0; border-top: 1px solid var(--line); }
.rotary-tool .ctrl:first-of-type { border-top: none; }
.rotary-tool .ctrl label { font-size: 14px; color: var(--muted); margin: 0; }
.rotary-tool .ctrl .dot { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 7px; vertical-align: 1px; }
.rotary-tool .dot.big { background: var(--big); }
.rotary-tool .dot.small { background: var(--small); }
.rotary-tool .ctrl output { font-family: var(--rt-mono); font-size: 14px; font-weight: 600; text-align: right; }

.rotary-tool input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; border-radius: 4px; background: var(--line-2); cursor: pointer; margin: 0; padding: 0; border: none; }
.rotary-tool input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: var(--ink); border: 2px solid var(--panel); box-shadow: 0 0 0 1px var(--line-2); }
.rotary-tool input[type=range]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--ink); border: 2px solid var(--panel); box-shadow: 0 0 0 1px var(--line-2); }
.rotary-tool input[type=range]:focus-visible { outline: 2px solid var(--big); outline-offset: 4px; }
.rotary-tool .hidefield { display: none !important; }

.rotary-tool .solver { display: grid; grid-template-columns: repeat(3, 1fr) auto; gap: 14px; align-items: end; }
.rotary-tool .solver .field { display: block; margin: 0; }
.rotary-tool .solver .field label { display: block; font-size: 12.5px; color: var(--muted); margin: 0 0 5px; }
.rotary-tool .solver input[type=number] { width: 100%; font-family: var(--rt-mono); font-size: 15px; padding: 9px 10px; border: 1px solid var(--line-2); border-radius: 8px; background: var(--paper); color: var(--ink); }
.rotary-tool .solver input[type=number]:focus { outline: 2px solid var(--big); outline-offset: 1px; border-color: var(--big); }
.rotary-tool .solver .answer { font-family: var(--rt-mono); font-size: 15px; color: var(--small-ink); background: var(--small-bg); border: 1px solid var(--small); border-radius: 8px; padding: 9px 12px; white-space: nowrap; }

.rotary-tool .prose { max-width: 66ch; margin: 34px 0 0; }
.rotary-tool .prose h2 { font-size: 19px; margin: 28px 0 8px; }
.rotary-tool .prose p { margin: 0 0 12px; }
.rotary-tool .prose .tag { font-family: var(--rt-mono); font-size: 12px; color: var(--big-ink); background: var(--big-bg); padding: 2px 7px; border-radius: 5px; }
.rotary-tool .eq { font-family: var(--rt-mono); font-size: 14px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; margin: 12px 0; overflow-x: auto; }
.rotary-tool .rt-foot { margin: 44px 0 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }

@media (max-width: 720px) {
  .rotary-tool .stage { grid-template-columns: 1fr; }
  .rotary-tool .results { grid-template-columns: 1fr 1fr; }
  .rotary-tool .ctrl { grid-template-columns: 1fr 64px; grid-template-areas: "lab val" "rng rng"; }
  .rotary-tool .ctrl label { grid-area: lab; }
  .rotary-tool .ctrl output { grid-area: val; }
  .rotary-tool .ctrl input { grid-area: rng; }
  .rotary-tool .solver { grid-template-columns: 1fr 1fr; }
}