/* Kepler's Laws — "observatory instrument" look: a dark, calm field with the orbit as the hero, brass hairlines,
   tabular numerals. Everything is scoped under .kp so it cannot collide with the shared site shell (.tlg-*). */

:root {
  --kp-bg: #070b13;
  --kp-panel: #0e1522;
  --kp-panel-2: #131c2c;
  --kp-raise: #1a2538;
  --kp-line: #26334a;
  --kp-line-2: #34445f;
  --kp-ink: #e9eef6;
  --kp-ink-2: #c3cddc;
  --kp-muted: #93a1b8;
  --kp-brass: #e0b25a;
  --kp-brass-2: #f3cf83;
  --kp-brass-ink: #1b1406;
  --kp-focus: #ffd66b;
  --kp-good: #6fd3a6;
  --kp-bad: #ff9a85;
  /* Okabe–Ito (colorblind-safe) for vectors and wedges */
  --kp-v: #56b4e9;
  --kp-f: #e69f00;
  --kp-l: #cc79a7;
  --kp-g: #009e73;
  --kp-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --kp-font: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --kp-top: 64px;
}

body.kp-page { background: var(--kp-bg); margin: 0; }
.kp, .kp * { box-sizing: border-box; }
.kp {
  font: 400 15px/1.45 var(--kp-font);
  color: var(--kp-ink);
  background: var(--kp-bg);
  -webkit-font-smoothing: antialiased;
}
:where(.kp) button, :where(.kp) select, :where(.kp) input { font: inherit; color: inherit; }
.kp :focus-visible { outline: 3px solid var(--kp-focus); outline-offset: 2px; }
.kp-sr { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.kp [hidden] { display: none !important; }
.kp-num, .kp output, .kp .kp-read-v { font-variant-numeric: tabular-nums; }

/* ── Buttons ─────────────────────────────────────────────── */
.kp-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 0 16px; border-radius: 8px; cursor: pointer;
  background: var(--kp-raise); border: 1px solid var(--kp-line-2); color: var(--kp-ink);
  font-weight: 700; letter-spacing: .01em;
}
.kp-btn:hover { border-color: var(--kp-brass); }
.kp-btn:disabled { opacity: .45; cursor: default; }
.kp-btn--primary { background: var(--kp-brass); color: var(--kp-brass-ink); border-color: var(--kp-brass); }
.kp-btn--primary:hover { background: var(--kp-brass-2); }
.kp-btn--quiet { background: transparent; min-height: 36px; padding: 0 10px; font-weight: 400; font-size: 14px; }
.kp-btn--test { background: transparent; border-color: var(--kp-brass); color: var(--kp-brass-2); }
.kp-btn--test:hover { background: rgba(224,178,90,.12); }
.kp-btn--sm { min-height: 36px; padding: 0 12px; font-size: 14px; }
.kp-iconbtn {
  min-width: 44px; min-height: 44px; border-radius: 8px; cursor: pointer;
  background: transparent; border: 1px solid var(--kp-line-2); color: var(--kp-ink-2); font-weight: 700;
}
.kp-iconbtn--wide { padding: 0 12px; font-weight: 400; }
.kp-iconbtn:hover { border-color: var(--kp-brass); color: var(--kp-ink); }
.kp-linkbtn { background: none; border: 0; padding: 4px 6px; color: var(--kp-brass-2); text-decoration: underline; cursor: pointer; font-size: 14px; font-weight: 400; min-height: 44px; }
.kp-x { width: 44px; height: 44px; border-radius: 8px; border: 0; background: transparent; color: var(--kp-muted); font-size: 24px; line-height: 1; cursor: pointer; }
.kp-x:hover { color: var(--kp-ink); background: var(--kp-raise); }

/* ── Start screen ────────────────────────────────────────── */
.kp-start {
  min-height: calc(100dvh - var(--kp-top));
  display: flex; align-items: flex-start; justify-content: center;
  padding: 40px 16px 56px;
  background:
    radial-gradient(1200px 500px at 70% -10%, rgba(224,178,90,.10), transparent 60%),
    radial-gradient(900px 600px at 10% 110%, rgba(86,180,233,.08), transparent 60%),
    var(--kp-bg);
  position: relative; overflow: hidden;
}
.kp-start::before {                 /* faint orbit rings behind the title */
  content: ""; position: absolute; right: -220px; top: -160px; width: 760px; height: 520px; border-radius: 50%;
  border: 1px solid rgba(224,178,90,.18); transform: rotate(-12deg);
  box-shadow: 0 0 0 70px transparent, inset 0 0 0 1px rgba(224,178,90,.05);
  pointer-events: none;
}
.kp-start-inner { width: min(1060px, 100%); position: relative; }
.kp-kicker { margin: 0 0 6px; color: var(--kp-brass-2); font-size: 14px; letter-spacing: .14em; text-transform: uppercase; }
.kp-start h1 { margin: 0 0 8px; font-size: clamp(34px, 5vw, 52px); line-height: 1.05; font-weight: 700; letter-spacing: -.01em; }
.kp-start-sub { margin: 0 0 28px; max-width: 62ch; color: var(--kp-ink-2); font-size: 17px; }
.kp-start-h2 { display: flex; align-items: center; gap: 10px; margin: 0 0 14px; font-size: 18px; }
.kp-step-num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--kp-brass); color: var(--kp-brass-2); font-size: 14px; }
.kp-level-grid, .kp-mode-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.kp-level-card, .kp-mode-card {
  display: flex; flex-direction: column; gap: 8px; text-align: left; cursor: pointer;
  padding: 18px 18px 16px; border-radius: 12px; min-height: 44px;
  background: linear-gradient(180deg, var(--kp-panel-2), var(--kp-panel));
  border: 1px solid var(--kp-line); color: var(--kp-ink);
  transition: border-color .15s, transform .15s;
}
.kp-level-card:hover, .kp-mode-card:hover { border-color: var(--kp-brass); transform: translateY(-1px); }
.kp-level-card[aria-pressed="true"] { border-color: var(--kp-brass); box-shadow: 0 0 0 1px var(--kp-brass) inset; }
.kp-level-title, .kp-mode-name { font-size: 18px; font-weight: 700; }
.kp-level-desc, .kp-mode-desc { color: var(--kp-ink-2); font-size: 15px; }
.kp-level-meta, .kp-mode-law { color: var(--kp-brass-2); font-size: 14px; }
.kp-mode-card { min-height: 128px; }
.kp-mode-card .kp-mode-key { font-family: var(--kp-mono); font-size: 13px; color: var(--kp-muted); }
.kp-start-step { margin-bottom: 26px; }
.kp-start-note { color: var(--kp-muted); font-size: 14px; margin: 20px 0 0; }

/* ── Instrument layout ───────────────────────────────────── */
.kp-app {
  display: grid; grid-template-rows: auto minmax(0, 1fr) auto;
  height: max(560px, calc(100dvh - var(--kp-top)));
  background: var(--kp-bg);
}
.kp-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: nowrap;
  padding: 6px 12px; min-height: 56px;
  background: var(--kp-panel); border-bottom: 1px solid var(--kp-line);
}
.kp-bar-name { font-weight: 700; font-size: 17px; white-space: nowrap; letter-spacing: .01em; }
.kp-bar-name::before { content: ""; display: inline-block; width: 18px; height: 11px; margin-right: 8px; border: 1.5px solid var(--kp-brass); border-radius: 50%; vertical-align: -1px; }
.kp-level-pick select {
  min-height: 44px; padding: 0 30px 0 12px; border-radius: 8px; cursor: pointer;
  background: var(--kp-panel-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23e0b25a' fill='none' stroke-width='2'/%3E%3C/svg%3E") no-repeat right 10px center;
  border: 1px solid var(--kp-line-2); appearance: none; -webkit-appearance: none;
}
.kp-modes { display: flex; gap: 4px; flex: 1 1 auto; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.kp-modes::-webkit-scrollbar { display: none; }
.kp-tab {
  display: inline-flex; align-items: center; gap: 7px; white-space: nowrap;
  min-height: 44px; padding: 0 12px; border-radius: 8px; cursor: pointer;
  background: transparent; border: 1px solid transparent; color: var(--kp-ink-2);
}
.kp-tab:hover { color: var(--kp-ink); border-color: var(--kp-line-2); }
.kp-tab[aria-current="true"] { color: var(--kp-ink); background: var(--kp-panel-2); border-color: var(--kp-brass); }
.kp-tab-k { font-family: var(--kp-mono); font-size: 12px; color: var(--kp-muted); border: 1px solid var(--kp-line-2); border-radius: 4px; padding: 0 4px; }
.kp-bar-tools { display: flex; gap: 6px; align-items: center; }
#kpTestBtn { white-space: nowrap; }
@media (max-width: 1320px) { .kp-tab-k { display: none; } .kp-tab { padding: 0 10px; } }

.kp-main { position: relative; display: grid; grid-template-columns: 320px minmax(0, 1fr); min-height: 0; }
.kp-main[data-table="on"] { grid-template-columns: 400px minmax(0, 1fr); }
.kp-side { display: flex; flex-direction: column; min-height: 0; background: var(--kp-panel); border-right: 1px solid var(--kp-line); }
.kp-side-head { padding: 14px 16px 10px; border-bottom: 1px solid var(--kp-line); }
.kp-side-law { margin: 0; font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--kp-brass-2); }
.kp-side-title { margin: 2px 0 0; font-size: 20px; }
.kp-side-body { flex: 1 1 auto; overflow-y: auto; padding: 12px 16px 20px; scrollbar-color: var(--kp-line-2) transparent; }

/* panel pieces */
.kp-sec { padding: 10px 0 12px; border-bottom: 1px solid var(--kp-line); }
.kp-sec:last-child { border-bottom: 0; }
.kp-sec-h { margin: 0 0 8px; font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--kp-muted); font-weight: 700; }
.kp-field { display: grid; gap: 4px; margin: 0 0 10px; }
.kp-field-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.kp-field label, .kp-field .kp-lab { font-size: 15px; color: var(--kp-ink-2); }
.kp-field output { font-family: var(--kp-mono); font-size: 14px; color: var(--kp-ink); }
.kp-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.kp select.kp-select, .kp input.kp-input {
  min-height: 44px; padding: 0 10px; border-radius: 8px; width: 100%;
  background: var(--kp-panel-2); border: 1px solid var(--kp-line-2); color: var(--kp-ink);
}
.kp input.kp-input--num { font-family: var(--kp-mono); }
.kp input.kp-input:invalid, .kp input.kp-input[aria-invalid="true"] { border-color: var(--kp-bad); }
.kp-hint { margin: 4px 0 0; font-size: 14px; color: var(--kp-muted); }
.kp-msg { margin: 6px 0 0; font-size: 14px; color: var(--kp-bad); min-height: 0; }
.kp-msg:empty { display: none; }
.kp-note { margin: 8px 0 0; padding: 8px 10px; border-left: 2px solid var(--kp-brass); background: rgba(224,178,90,.07); font-size: 14px; color: var(--kp-ink-2); border-radius: 0 6px 6px 0; }

/* range sliders */
.kp input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 44px; background: transparent; cursor: pointer; margin: 0; }
.kp input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: var(--kp-line-2); }
.kp input[type="range"]::-moz-range-track { height: 4px; border-radius: 2px; background: var(--kp-line-2); }
.kp input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 22px; height: 22px; margin-top: -9px; border-radius: 50%; background: var(--kp-brass); border: 3px solid var(--kp-bg); box-shadow: 0 0 0 1px var(--kp-brass); }
.kp input[type="range"]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--kp-brass); border: 3px solid var(--kp-bg); }
.kp input[type="range"]:focus-visible { outline-offset: -2px; }
.kp-slider-marks { position: relative; height: 20px; margin-top: -8px; font-size: 12px; color: var(--kp-muted); }
.kp-slider-mark { position: absolute; top: 0; transform: translateX(-50%); white-space: nowrap; padding-top: 6px; }
.kp-slider-mark::before { content: ""; position: absolute; left: 50%; top: -4px; width: 2px; height: 10px; background: currentColor; }
.kp-slider-mark--c { color: var(--kp-v); }
.kp-slider-mark--esc { color: var(--kp-f); }

/* segmented + check toggles */
.kp-seg { display: inline-flex; border: 1px solid var(--kp-line-2); border-radius: 8px; overflow: hidden; }
.kp-seg button { min-height: 40px; min-width: 44px; padding: 0 12px; border: 0; background: transparent; cursor: pointer; color: var(--kp-ink-2); }
.kp-seg button + button { border-left: 1px solid var(--kp-line-2); }
.kp-seg button[aria-pressed="true"] { background: var(--kp-brass); color: var(--kp-brass-ink); font-weight: 700; }
.kp-check { display: flex; align-items: center; gap: 10px; min-height: 44px; cursor: pointer; font-size: 15px; color: var(--kp-ink-2); }
.kp-check input { width: 20px; height: 20px; accent-color: var(--kp-brass); cursor: pointer; flex: none; }
.kp-check:hover { color: var(--kp-ink); }
.kp-swatch { width: 22px; height: 12px; flex: none; border-radius: 2px; }
.kp-swatch--line { height: 0; border-top: 3px solid currentColor; border-radius: 0; }
.kp-swatch--dash { height: 0; border-top: 2px dashed currentColor; border-radius: 0; }

/* readouts */
.kp-reads { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; margin: 0; }
.kp-reads dt { color: var(--kp-ink-2); font-size: 14px; line-height: 1.3; padding: 3px 0; }
.kp-reads dd { padding: 3px 0; }
.kp-reads dd { margin: 0; text-align: right; font-family: var(--kp-mono); font-size: 14px; color: var(--kp-ink); white-space: nowrap; }
.kp-reads dd.kp-ok { color: var(--kp-good); }
.kp-eq { font-family: var(--kp-mono); font-size: 14px; color: var(--kp-ink); background: var(--kp-panel-2); border: 1px solid var(--kp-line); border-radius: 8px; padding: 8px 10px; margin: 6px 0; line-height: 1.6; overflow-x: auto; }
.kp-eq em { font-style: italic; color: var(--kp-brass-2); }
.kp-eq .kp-eq-dim { color: var(--kp-muted); }

/* squashed meter (Earth & Space) */
.kp-meter { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: center; font-size: 14px; color: var(--kp-muted); }
.kp-meter-track { position: relative; height: 12px; border-radius: 6px; background: linear-gradient(90deg, #1d2a40, #3b2f18); border: 1px solid var(--kp-line-2); }
.kp-meter-fill { position: absolute; inset: 0 auto 0 0; border-radius: 6px; background: linear-gradient(90deg, var(--kp-v), var(--kp-brass)); }
.kp-meter-shape { width: 48px; height: 28px; }

/* bars (energy, year length, speed compare) */
.kp-bars { display: grid; gap: 6px; }
.kp-barrow { display: grid; grid-template-columns: 84px 1fr auto; gap: 8px; align-items: center; font-size: 14px; }
.kp-barrow .kp-bar-track { position: relative; height: 14px; background: var(--kp-panel-2); border: 1px solid var(--kp-line); border-radius: 3px; overflow: hidden; }
.kp-barrow .kp-bar-fill { position: absolute; top: 0; bottom: 0; left: 0; background: var(--kp-v); }
.kp-barrow .kp-bar-v { font-family: var(--kp-mono); font-size: 13px; color: var(--kp-ink-2); min-width: 64px; text-align: right; }
.kp-ebars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; align-items: end; height: 190px; padding: 0 4px; position: relative; }
.kp-ebars::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1px solid var(--kp-line-2); }
.kp-ebar { position: relative; height: 100%; }
.kp-ebar-fill { position: absolute; left: 12%; right: 12%; border-radius: 3px; }
.kp-ebar-lab { position: absolute; left: 0; right: 0; bottom: -2px; transform: translateY(100%); text-align: center; font-size: 14px; font-weight: 700; }
.kp-ebar-val { position: absolute; left: -4px; right: -4px; text-align: center; font-family: var(--kp-mono); font-size: 11px; white-space: nowrap; color: var(--kp-ink-2); }
.kp-ebars-wrap { padding: 16px 0 28px; }

/* data table (Harmonies) */
.kp-table-wrap { overflow-x: auto; margin: 0 -4px; }
.kp-table { border-collapse: collapse; width: 100%; font-size: 12px; }
.kp-table th, .kp-table td { padding: 4px 3px; border-bottom: 1px solid var(--kp-line); text-align: right; white-space: nowrap; }
.kp-table th:first-child, .kp-table td:first-child { text-align: left; }
.kp-table th { color: var(--kp-muted); font-weight: 700; vertical-align: bottom; }
.kp-table td { font-family: var(--kp-mono); }
.kp-table td:first-child { font-family: var(--kp-font); }
.kp-table input { width: 52px; min-height: 32px; padding: 0 4px; border-radius: 4px; background: var(--kp-panel-2); border: 1px solid var(--kp-line-2); font-family: var(--kp-mono); font-size: 13px; text-align: right; }
.kp-table .kp-cell-ok input { border-color: var(--kp-good); }
.kp-table .kp-cell-bad input { border-color: var(--kp-bad); }
.kp-colbtn { background: none; border: 0; color: var(--kp-muted); cursor: pointer; font-size: 11px; text-decoration: underline; padding: 2px; min-height: 24px; }
.kp-table-note { font-size: 13px; color: var(--kp-muted); margin: 6px 0 0; }

/* derivation steps */
.kp-steps { counter-reset: kpstep; margin: 0; padding: 0; list-style: none; }
.kp-steps li { counter-increment: kpstep; position: relative; padding: 6px 0 6px 30px; font-size: 14px; }
.kp-steps li::before { content: counter(kpstep); position: absolute; left: 0; top: 7px; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--kp-brass); color: var(--kp-brass-2); display: grid; place-items: center; font-size: 12px; }

/* ── Stage ───────────────────────────────────────────────── */
.kp-stage { position: relative; min-width: 0; min-height: 0; overflow: hidden; background: #03060c; }
.kp-gl, .kp-ov { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.kp-ov { touch-action: none; }
.kp-stage[data-cam="3d"] .kp-ov { pointer-events: none; }
.kp-stage[data-drag="1"] .kp-ov { cursor: grabbing; }
.kp-reticle { position: absolute; inset: 10px; pointer-events: none; border: 1px solid rgba(224,178,90,.10);
  background:
    linear-gradient(var(--kp-brass), var(--kp-brass)) left 50% top 0 / 1px 8px no-repeat,
    linear-gradient(var(--kp-brass), var(--kp-brass)) left 50% bottom 0 / 1px 8px no-repeat,
    linear-gradient(var(--kp-brass), var(--kp-brass)) left 0 top 50% / 8px 1px no-repeat,
    linear-gradient(var(--kp-brass), var(--kp-brass)) right 0 top 50% / 8px 1px no-repeat;
  opacity: .55; }
.kp-badges { position: absolute; top: 14px; right: 64px; display: flex; flex-direction: column; align-items: flex-end; gap: 6px; pointer-events: none; }
.kp-badge { font-size: 13px; padding: 4px 10px; border-radius: 999px; background: rgba(14,21,34,.86); border: 1px solid var(--kp-line-2); color: var(--kp-ink-2); }
.kp-badge--class { font-size: 15px; font-weight: 700; color: var(--kp-ink); border-color: var(--kp-brass); padding: 6px 14px; }
.kp-badge--warn { border-color: var(--kp-bad); color: var(--kp-ink); }
.kp-try {
  position: absolute; left: 14px; top: 14px; width: min(330px, calc(100% - 28px)); z-index: 3;
  background: rgba(14,21,34,.94); border: 1px solid var(--kp-line-2); border-top: 2px solid var(--kp-brass);
  border-radius: 10px; padding: 4px 6px 10px 14px; box-shadow: 0 10px 30px rgba(0,0,0,.4);
}
.kp-try-head { display: flex; justify-content: space-between; align-items: center; }
.kp-try-toggle { background: none; border: 0; padding: 0; min-height: 44px; font-weight: 700; cursor: pointer; text-align: left; flex: 1; }
.kp-try-toggle::after { content: " ▾"; color: var(--kp-brass); }
.kp-try[data-collapsed="true"] { width: auto; padding-bottom: 4px; }
.kp-try[data-collapsed="true"] ol, .kp-try[data-collapsed="true"] .kp-try-lm { display: none; }
.kp-try[data-collapsed="true"] .kp-try-toggle::after { content: " ▸"; }
.kp-try ol { margin: 0; padding-left: 20px; font-size: 15px; color: var(--kp-ink-2); }
.kp-try li { margin: 0 0 6px; padding-right: 8px; }
.kp-viewtools { position: absolute; right: 64px; bottom: 76px; display: flex; gap: 6px; }
.kp-chip { min-height: 44px; min-width: 44px; padding: 0 12px; border-radius: 8px; cursor: pointer; background: rgba(14,21,34,.86); border: 1px solid var(--kp-line-2); color: var(--kp-ink-2); font-size: 15px; }
.kp-chip:hover { color: var(--kp-ink); border-color: var(--kp-brass); }
.kp-chip[aria-pressed="true"] { border-color: var(--kp-brass); color: var(--kp-brass-2); }
.kp-timebar {
  position: absolute; left: 14px; right: 64px; bottom: 14px; display: flex; align-items: center; gap: 8px;
  padding: 4px 8px; border-radius: 12px; background: rgba(14,21,34,.9); border: 1px solid var(--kp-line-2);
}
.kp-tbtn { width: 44px; height: 44px; border-radius: 8px; border: 0; background: transparent; cursor: pointer; display: grid; place-items: center; color: var(--kp-ink-2); flex: none; }
.kp-tbtn svg { width: 20px; height: 20px; fill: currentColor; }
.kp-tbtn:hover { color: var(--kp-ink); background: var(--kp-raise); }
.kp-tbtn--play { background: var(--kp-brass); color: var(--kp-brass-ink); }
.kp-tbtn--play:hover { background: var(--kp-brass-2); color: var(--kp-brass-ink); }
.kp-tbtn--text { width: auto; padding: 0 12px; font-size: 15px; }
.kp-tbtn--play .kp-ico-play { display: none; }
.kp-tbtn--play[data-paused="true"] .kp-ico-play { display: block; }
.kp-tbtn--play[data-paused="true"] .kp-ico-pause { display: none; }
.kp-speed { display: flex; align-items: center; gap: 8px; flex: 1 1 auto; min-width: 90px; font-size: 14px; color: var(--kp-muted); }
.kp-time { font-family: var(--kp-mono); font-size: 14px; min-width: 150px; text-align: right; color: var(--kp-ink); white-space: nowrap; }

/* ── Tools drawer ────────────────────────────────────────── */
.kp-tools { position: absolute; top: 0; right: 0; bottom: 0; display: flex; z-index: 5; pointer-events: none; }
.kp-tools > * { pointer-events: auto; }
.kp-tools-tab {
  align-self: flex-start; margin-top: 14px; width: 44px; min-height: 120px; border-radius: 10px 0 0 10px; cursor: pointer;
  background: var(--kp-panel); border: 1px solid var(--kp-line-2); border-right: 0; color: var(--kp-ink-2);
  writing-mode: vertical-rl; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; font-size: 13px;
}
.kp-tools-tab:hover, .kp-tools[data-open="true"] .kp-tools-tab { color: var(--kp-brass-2); border-color: var(--kp-brass); }
.kp-main[data-tools="open"] .kp-stage { margin-right: 300px; }
.kp-tools-panel { width: 300px; background: var(--kp-panel); border-left: 1px solid var(--kp-line-2); display: flex; flex-direction: column; box-shadow: -12px 0 30px rgba(0,0,0,.35); }
.kp-tools-head { display: flex; align-items: center; gap: 6px; padding: 6px 6px 6px 16px; border-bottom: 1px solid var(--kp-line); }
.kp-tools-head strong { flex: 1; }
.kp-tools-body { overflow-y: auto; padding: 4px 16px 16px; }
.kp-tools-body details { border-bottom: 1px solid var(--kp-line); }
.kp-tools-body summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; font-weight: 700; font-size: 14px; letter-spacing: .08em; text-transform: uppercase; color: var(--kp-ink-2); list-style: none; }
.kp-tools-body summary::-webkit-details-marker { display: none; }
.kp-tools-body summary::after { content: "+"; margin-left: auto; color: var(--kp-brass); font-size: 18px; }
.kp-tools-body details[open] summary::after { content: "−"; }
.kp-tools-body .kp-tools-sec { padding-bottom: 10px; }
.kp-tools-empty { font-size: 14px; color: var(--kp-muted); margin: 0 0 10px; }

/* ── Graph dock ──────────────────────────────────────────── */
.kp-dock { position: relative; height: var(--kp-dock-h, 220px); min-height: 150px; background: var(--kp-panel); border-top: 1px solid var(--kp-line-2); display: flex; flex-direction: column; }
.kp-dock-grip { position: absolute; left: 0; right: 0; top: -6px; height: 12px; cursor: ns-resize; z-index: 2; }
.kp-dock-grip::after { content: ""; position: absolute; left: 50%; top: 4px; width: 48px; height: 4px; margin-left: -24px; border-radius: 2px; background: var(--kp-line-2); }
.kp-dock-grip:hover::after, .kp-dock-grip:focus-visible::after { background: var(--kp-brass); }
.kp-dock-head { display: flex; align-items: center; gap: 12px; padding: 2px 6px 2px 16px; border-bottom: 1px solid var(--kp-line); }
.kp-dock-opts { display: flex; gap: 6px; flex: 1; flex-wrap: wrap; }
.kp-dock-body { flex: 1; min-height: 0; position: relative; }
.kp-dock-body canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ── Dialog ──────────────────────────────────────────────── */
.kp-dialog { width: min(720px, calc(100vw - 32px)); max-height: calc(100dvh - 48px); padding: 0; border-radius: 12px; border: 1px solid var(--kp-line-2); background: var(--kp-panel); color: var(--kp-ink); font: 400 15px/1.5 var(--kp-font); }
.kp-dialog::backdrop { background: rgba(0,0,0,.6); }
.kp-dialog-head { display: flex; justify-content: space-between; align-items: center; padding: 6px 6px 6px 20px; border-bottom: 1px solid var(--kp-line); }
.kp-dialog-head h2 { margin: 0; font-size: 18px; }
.kp-dialog-body { padding: 8px 20px 20px; overflow-y: auto; max-height: calc(100dvh - 120px); }
.kp-dialog-body h3 { font-size: 15px; margin: 16px 0 6px; color: var(--kp-brass-2); }
.kp-dialog-body ul { margin: 0; padding-left: 18px; }
.kp-dialog-body li { margin: 0 0 6px; color: var(--kp-ink-2); }
.kp-dialog a { color: var(--kp-brass-2); }

/* ── Test Mode ───────────────────────────────────────────── */
.kp-test { min-height: calc(100dvh - var(--kp-top)); background: var(--kp-bg); padding: 0 0 40px; }
.kp-test-bar { display: flex; align-items: center; gap: 14px; padding: 8px 16px; min-height: 56px; background: var(--kp-panel); border-bottom: 1px solid var(--kp-line); }
.kp-test-bar h2 { margin: 0; font-size: 17px; white-space: nowrap; }
.kp-progress { flex: 1; display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--kp-muted); }
.kp-progress-track { flex: 1; height: 6px; border-radius: 3px; background: var(--kp-line); overflow: hidden; max-width: 420px; }
.kp-progress-fill { height: 100%; background: var(--kp-brass); transition: width .2s; }
.kp-test-inner { width: min(1100px, 100%); margin: 0 auto; padding: 20px 16px; }
.kp-item { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 22px; align-items: start; }
.kp-item--nodiagram { grid-template-columns: minmax(0, 720px); justify-content: center; }
.kp-item-card { background: var(--kp-panel); border: 1px solid var(--kp-line); border-radius: 12px; padding: 18px 20px; }
.kp-item-law { font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--kp-brass-2); margin: 0 0 6px; }
.kp-item-prompt { font-size: 17px; margin: 0 0 14px; line-height: 1.5; }
.kp-item-prompt sup, .kp-item-prompt sub { line-height: 0; }
.kp-choices { display: grid; gap: 8px; margin: 0; padding: 0; border: 0; }
.kp-choice { display: flex; gap: 12px; align-items: center; min-height: 48px; padding: 8px 14px; border-radius: 10px; cursor: pointer; background: var(--kp-panel-2); border: 1px solid var(--kp-line-2); font-size: 16px; }
.kp-choice:hover { border-color: var(--kp-brass); }
.kp-choice input { width: 20px; height: 20px; accent-color: var(--kp-brass); flex: none; }
.kp-choice:has(input:checked) { border-color: var(--kp-brass); background: rgba(224,178,90,.10); }
.kp-choice canvas { background: #0a101b; border-radius: 6px; border: 1px solid var(--kp-line); }
.kp-choices--graphs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.kp-choices--graphs .kp-choice { flex-direction: column; align-items: stretch; }
.kp-numrow { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.kp-numrow .kp-input { max-width: 220px; }
.kp-units { color: var(--kp-ink-2); font-size: 16px; }
.kp-part { padding: 10px 0; border-top: 1px dashed var(--kp-line-2); }
.kp-part:first-of-type { border-top: 0; padding-top: 0; }
.kp-part-p { margin: 0 0 8px; font-size: 16px; }
.kp-diagram { background: #050910; border: 1px solid var(--kp-line); border-radius: 12px; position: relative; aspect-ratio: 4 / 3; overflow: hidden; }
.kp-diagram canvas { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; }
.kp-diagram-cap { font-size: 14px; color: var(--kp-muted); margin: 8px 2px 0; }
.kp-order { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.kp-order li { display: flex; align-items: center; gap: 10px; padding: 4px 6px 4px 14px; min-height: 48px; border-radius: 10px; background: var(--kp-panel-2); border: 1px solid var(--kp-line-2); font-size: 16px; }
.kp-order li span { flex: 1; }
.kp-order .kp-ord-n { flex: none; font-family: var(--kp-mono); color: var(--kp-muted); width: 20px; }
.kp-order button { width: 44px; height: 40px; border-radius: 8px; border: 1px solid var(--kp-line-2); background: transparent; cursor: pointer; color: var(--kp-ink-2); }
.kp-order button:disabled { opacity: .3; cursor: default; }
.kp-test-nav { display: flex; gap: 10px; align-items: center; justify-content: space-between; margin-top: 18px; flex-wrap: wrap; }
.kp-test-nav .kp-row { gap: 10px; }
.kp-flag[aria-pressed="true"] { border-color: var(--kp-f); color: #ffd38a; }
.kp-review-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 16px 0; }
.kp-review-cell { min-height: 64px; border-radius: 10px; padding: 8px 12px; text-align: left; cursor: pointer; background: var(--kp-panel-2); border: 1px solid var(--kp-line-2); display: grid; gap: 2px; }
.kp-review-cell:hover { border-color: var(--kp-brass); }
.kp-review-cell b { font-size: 15px; }
.kp-review-cell span { font-size: 13px; color: var(--kp-muted); }
.kp-review-cell[data-state="blank"] span { color: var(--kp-bad); }
.kp-review-cell[data-flag="1"] { border-color: var(--kp-f); }
.kp-score-hero { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; background: var(--kp-panel); border: 1px solid var(--kp-line); border-radius: 12px; padding: 20px 22px; }
.kp-score-big { font-size: 48px; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.kp-score-big small { font-size: 20px; color: var(--kp-muted); font-weight: 400; }
.kp-lawgrid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; flex: 1; min-width: 280px; }
.kp-lawcell { background: var(--kp-panel-2); border: 1px solid var(--kp-line); border-radius: 10px; padding: 8px 12px; }
.kp-lawcell b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.kp-lawcell span { font-size: 13px; color: var(--kp-muted); }
.kp-feedback { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.kp-fb { background: var(--kp-panel); border: 1px solid var(--kp-line); border-left: 4px solid var(--kp-bad); border-radius: 10px; padding: 12px 16px; }
.kp-fb[data-ok="1"] { border-left-color: var(--kp-good); }
.kp-fb-h { display: flex; gap: 10px; align-items: baseline; margin: 0 0 6px; font-size: 15px; }
.kp-fb-mark { font-weight: 700; }
.kp-fb[data-ok="1"] .kp-fb-mark { color: var(--kp-good); }
.kp-fb[data-ok="0"] .kp-fb-mark { color: var(--kp-bad); }
.kp-fb p { margin: 4px 0; font-size: 15px; color: var(--kp-ink-2); }
.kp-fb .kp-fb-ans { font-size: 15px; color: var(--kp-ink); font-variant-numeric: tabular-nums; }
.kp-turnin { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 14px; }
.kp-turnin-note { font-size: 14px; color: var(--kp-muted); margin: 8px 0 0; }
.kp-intro-list { color: var(--kp-ink-2); padding-left: 20px; }
.kp-intro-list li { margin-bottom: 6px; }

/* ── Narrow screens / tablets ────────────────────────────── */
@media (max-width: 1100px) {
  .kp-main { grid-template-columns: 260px minmax(0, 1fr); }
  .kp-main[data-table="on"] { grid-template-columns: 400px minmax(0, 1fr); }
  .kp-tab-t { display: none; }
  .kp-tab[aria-current="true"] .kp-tab-t { display: inline; }
}
@media (max-width: 820px) {
  .kp-main[data-tools="open"] .kp-stage { margin-right: 0; }
  .kp-app { height: auto; grid-template-rows: auto auto auto; }
  .kp-bar { flex-wrap: wrap; }
  .kp-modes { order: 5; flex-basis: 100%; }
  .kp-main, .kp-main[data-table="on"] { grid-template-columns: 1fr; }
  .kp-stage { height: 62vh; min-height: 380px; order: -1; }
  .kp-side { border-right: 0; border-top: 1px solid var(--kp-line); }
  .kp-side-body { overflow: visible; }
  .kp-tools { position: absolute; top: 0; height: 62vh; min-height: 380px; bottom: auto; }
  .kp-item { grid-template-columns: 1fr; }
  .kp-lawgrid { grid-template-columns: repeat(2, 1fr); }
  .kp-time { min-width: 0; }
  .kp-badges, .kp-viewtools { right: 56px; }
}
@media (max-width: 520px) {
  .kp-bar-name { display: none; }
  .kp-speed span { display: none; }
  .kp-timebar { left: 8px; right: 52px; gap: 2px; padding: 2px 4px; }
  .kp-tbtn { width: 40px; }
  .kp-tbtn--text { padding: 0 8px; }
  .kp-speed { min-width: 50px; }
  .kp-time { font-size: 12px; }
  .kp-viewtools { right: 52px; bottom: 70px; }
  .kp-try { top: 8px; left: 8px; }
  .kp-choices--graphs { grid-template-columns: 1fr; }
  .kp-tools-panel { width: min(300px, calc(100vw - 44px)); }
}
@media (prefers-reduced-motion: reduce) {
  .kp-level-card, .kp-mode-card, .kp-progress-fill { transition: none; }
}

/* ── Round 2: direct manipulation, activities, notebook, investigations ─────────── */
/* tap / hover to explain */
.kp-tip {
  position: absolute; z-index: 6; max-width: 280px; padding: 8px 12px; border-radius: 8px; pointer-events: none;
  background: rgba(14,21,34,.96); border: 1px solid var(--kp-brass); color: var(--kp-ink); font-size: 14px; line-height: 1.4;
  box-shadow: 0 8px 24px rgba(0,0,0,.45);
}
.kp-tip b { display: block; color: var(--kp-brass-2); font-size: 13px; margin-bottom: 2px; }
.kp-wt { border-top: 1px solid var(--kp-line); }
.kp-wt summary { cursor: pointer; padding: 8px 0; min-height: 36px; }
.kp-wt p { margin: 0 0 10px; color: var(--kp-ink-2); font-size: 14px; }
/* time bar jumps */
.kp-tbtn--jump { font-size: 13px; white-space: nowrap; }
/* dock: sketch + fit-line + notebook */
.kp-chip--go { border-color: var(--kp-brass); color: var(--kp-brass-2); font-weight: 700; }
.kp-dock-hint { font-size: 13px; color: var(--kp-muted); align-self: center; }
.kp-dock-fb { font-size: 13px; color: var(--kp-ink); align-self: center; max-width: 520px; }
.kp-dock-opts { flex-wrap: wrap; }
.kp-dock-html { position: absolute; inset: 0; overflow: auto; padding: 6px 10px 10px; }
.kp-dock-body canvas[tabindex="0"]:focus-visible { outline: 2px solid var(--kp-focus); outline-offset: -2px; }
.kp-nb-head { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin-bottom: 8px; }
.kp-nb-plot { display: inline-flex; gap: 6px; align-items: center; font-size: 14px; color: var(--kp-ink-2); }
.kp .kp-select--sm { min-height: 36px; padding: 4px 8px; font-size: 14px; max-width: 200px; }
.kp-nb-body { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
.kp-nb-body:has(.kp-nb-canvas) { grid-template-columns: minmax(0, 1.4fr) minmax(240px, 1fr); }
.kp-nb-tablewrap { max-height: 100%; }
.kp-nb-table td input { width: 100%; min-width: 120px; }
.kp-nb-table tr.kp-nb-note td { color: var(--kp-brass-2); }
.kp-nb-canvas { width: 100%; height: 220px; }
/* activities */
.kp-row-mine td { color: #f0e442; }
.kp-mission { border: 1px solid var(--kp-brass); border-radius: 10px; padding: 8px 12px; margin-bottom: 8px; background: rgba(224,178,90,.07); }
.kp-mission p { margin: 4px 0; }
.kp-mission-t { font-size: 15px; }
.kp-ok-note { color: var(--kp-good); font-weight: 700; }
.kp-missions { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.kp-mission-btn {
  width: 100%; min-height: 44px; display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 6px 12px;
  border-radius: 8px; background: var(--kp-panel-2); border: 1px solid var(--kp-line-2); color: var(--kp-ink); cursor: pointer; font: inherit; text-align: left;
}
.kp-mission-btn:hover, .kp-mission-btn[aria-pressed="true"] { border-color: var(--kp-brass); }
.kp-mission-stars { color: var(--kp-brass-2); letter-spacing: 1px; white-space: nowrap; }
/* guided investigation stepper */
.kp-try-inv { margin: 8px 8px 0 0; }
.kp-inv {
  position: absolute; left: 14px; top: 14px; width: min(340px, calc(100% - 28px)); z-index: 4;
  background: rgba(14,21,34,.95); border: 1px solid var(--kp-line-2); border-top: 2px solid var(--kp-v);
  border-radius: 10px; padding: 6px 10px 10px 14px; box-shadow: 0 10px 30px rgba(0,0,0,.4); font-size: 14px;
}
.kp-inv-head { display: flex; align-items: center; gap: 8px; }
.kp-inv-head b { flex: 1; font-size: 15px; }
.kp-inv-dots { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.kp-inv-dots li { width: 8px; height: 8px; border-radius: 50%; background: var(--kp-line-2); }
.kp-inv-dots li.done { background: var(--kp-good); }
.kp-inv-dots li.now { background: var(--kp-v); }
.kp-inv-kind { margin: 6px 0 2px; color: var(--kp-v); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
.kp-inv-text { margin: 0 0 8px; }
.kp-inv-mini { margin: 2px 0 0; color: var(--kp-ink-2); }
.kp-inv-status { color: var(--kp-ink-2); margin: 4px 0; }
.kp-inv-choices { border: 0; margin: 0 0 8px; padding: 0; display: grid; gap: 4px; }
.kp-inv-choices label { display: flex; gap: 8px; align-items: flex-start; min-height: 32px; cursor: pointer; }
.kp-inv-choices input { margin-top: 3px; accent-color: var(--kp-brass); }
.kp .kp-inv-ta { width: 100%; min-height: 64px; resize: vertical; font: inherit; }
.kp-inv-done { color: var(--kp-good); }
@media (max-width: 760px) { .kp-inv { top: 8px; left: 8px; } .kp-nb-body:has(.kp-nb-canvas) { grid-template-columns: 1fr; } }
/* phones: the time bar wraps, and the jump buttons take their own row under the controls */
@media (max-width: 520px) {
  .kp-timebar { flex-wrap: wrap; row-gap: 2px; }
  .kp-tbtn.kp-tbtn--text { width: auto; }
  .kp-tbtn--jump { order: 5; flex: 1 1 40%; min-height: 36px; }
  .kp-stage:has(.kp-tbtn--jump:not([hidden])) .kp-viewtools { bottom: 112px; }
}
/* Test Mode: a moment after each screen change, clicks are ignored (a double-click must not answer the next question) */
.kp-test--settling .kp-test-inner { pointer-events: none; }