:root {
  --bg: #12141a; --panel: #1a1d26; --line: #2a2e3a; --ink: #e9e9ee; --ink2: #b9bcc6; --dim: #8a8f9c;
  --median: #3987e5; --worst: #d95926; --best: #199e70; --ghost: #898781;
  --radius: 14px; --gap: 16px;
  color-scheme: dark;
}
html.easy { --ink: #ffffff; --ink2: #e2e4ea; --dim: #c3c6cf; --line: #4a5062; font-size: 125%; }

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 0 16px 48px; }

.top { max-width: 760px; margin: 0 auto; padding: 20px 16px 8px; display: flex; gap: 12px; align-items: center; }
.top img { border-radius: 50%; flex: none; }
.top h1 { margin: 0; font-size: 1.4rem; letter-spacing: -0.01em; }
.top .tag { margin: 2px 0 0; color: var(--ink2); font-size: 0.95rem; }
.top button { margin-left: auto; }

button {
  font: inherit; color: var(--ink); background: var(--median); border: 0; border-radius: 10px;
  padding: 12px 16px; min-height: 44px; cursor: pointer;
}
button.ghost { background: transparent; border: 1px solid var(--line); }
button:focus-visible, select:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--median); outline-offset: 2px; }

.strip { background: #182233; border: 1px solid #2c4a72; border-radius: var(--radius); padding: 14px 16px; margin: 12px 0; }
.strip p { margin: 0 0 10px; }

.modes { display: flex; gap: 8px; margin: 16px 0; }
.modes button { flex: 1; background: var(--panel); border: 1px solid var(--line); }
.modes button[aria-pressed="true"] { background: var(--median); border-color: var(--median); }

.inputs { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); background: var(--panel);
  border-radius: var(--radius); padding: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { color: var(--ink2); font-size: 0.95rem; }
.field output { color: var(--ink); font-weight: 700; }
.money { display: flex; align-items: center; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; }
.money span { padding: 0 4px 0 12px; color: var(--dim); }
input[type="number"], select {
  font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; min-height: 44px; width: 100%;
}
.money input { border: 0; background: transparent; }
input[type="range"] { width: 100%; min-height: 44px; accent-color: var(--median); }

.card { background: var(--panel); border-radius: var(--radius); padding: 8px 16px 16px; margin-top: var(--gap); }
.panel { padding: 16px 0; border-bottom: 1px solid var(--line); }
.panel h2 { font-size: 1.1rem; margin: 0 0 6px; }
.panel .lead { font-size: 1.15rem; font-weight: 650; margin: 0 0 10px; }
.panel p { margin: 0 0 10px; color: var(--ink2); }
.panel .note { color: var(--dim); font-size: 0.92rem; }
svg { width: 100%; height: auto; display: block; margin: 8px 0; }
svg .lbl, svg .val { fill: var(--ink2); font-size: 15px; }
svg .val { fill: var(--ink); font-weight: 700; }
svg .val.in { fill: #0b0d12; }
svg .track { fill: #232735; }
svg .tick { fill: var(--dim); font-size: 13px; }
svg .grid { stroke: var(--line); stroke-width: 1; }
svg .band { fill: rgba(57, 135, 229, 0.14); }
svg .dot { fill: var(--ghost); fill-opacity: 0.55; }
svg .mark { font-size: 13px; font-weight: 700; }
html.easy svg .dot { fill-opacity: 0.9; }

details { margin: 12px 0 0; }
summary { cursor: pointer; color: var(--ink); min-height: 44px; display: flex; align-items: center; gap: 8px; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "\25B6"; color: var(--median); font-size: 0.75em; width: 1em; }   /* the arrow display:flex hides */
details[open] > summary::before { content: "\25BC"; }
details table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 6px 0; }
details th, details td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.lookup .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.lookup select { width: auto; }
.terms ul { margin: 6px 0; padding-left: 18px; color: var(--ink2); }

.fine { margin-top: 16px; color: var(--dim); font-size: 0.88rem; }
.fine p { margin: 0 0 6px; }
.fine a { color: var(--median); }
.fine .disclaimer { color: var(--ink2); }

.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: var(--gap); }
#copied { color: var(--best); }

@media (max-width: 720px) {
  .inputs { grid-template-columns: 1fr; }
  .top { flex-wrap: wrap; }
  .top button { margin-left: 0; padding: 10px 12px; font-size: 0.9rem; }
  .modes button { padding: 10px 8px; }
}

/* Phase 1.5: three modes, range hints, change notes, More settings */
.modes { flex-wrap: wrap; }
.modes button { min-width: 0; }
.hint { color: var(--dim); font-size: 0.85rem; }
.clamp { color: var(--worst, #d95926); font-size: 0.88rem; }
.clamp:empty { display: none; }
.field input[type="number"]:not(.money input) { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; }
details.more { grid-column: 1 / -1; }
details.more .field { margin-top: 10px; }