/* Last Layer Trainer */

:root {
  color-scheme: dark;
  --bg: #0f172a;
  --bg2: #111827;
  --card: rgba(15, 23, 42, 0.86);
  --card2: rgba(30, 41, 59, 0.75);
  --line: rgba(148, 163, 184, 0.22);
  --line-strong: rgba(148, 163, 184, 0.42);
  --ink: #e5e7eb;
  --dim: #94a3b8;
  --accent: #60a5fa;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg2) 100%) fixed;
  color: var(--ink);
  line-height: 1.5;
  min-height: 100vh;
}

.wrap { width: min(1180px, 100%); margin: 0 auto; padding: 0 18px; }

.skip-link {
  position: fixed; left: 12px; top: 10px; z-index: 100;
  transform: translateY(-150%); padding: 9px 13px; border-radius: 8px;
  background: #f8fafc; color: #0f172a; font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid #fbbf24 !important;
  outline-offset: 3px;
}

/* --------------------------------------------------------------- header */

.top {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.16), rgba(16, 185, 129, 0.10));
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
}
.top .wrap { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: space-between; padding-top: 14px; padding-bottom: 14px; }
.brand { display: flex; gap: 14px; align-items: center; }
.brand h1 { margin: 0; font-size: 1.25rem; letter-spacing: -0.01em; }
.brand p { margin: 2px 0 0; color: var(--dim); font-size: 0.86rem; }

.logo {
  width: 34px; height: 34px; flex: none; border-radius: 8px;
  background:
    linear-gradient(#FFD500, #FFD500) 0 0 / 32% 32% no-repeat,
    linear-gradient(#D01C28, #D01C28) 50% 0 / 32% 32% no-repeat,
    linear-gradient(#00A651, #00A651) 100% 0 / 32% 32% no-repeat,
    linear-gradient(#0055BF, #0055BF) 0 50% / 32% 32% no-repeat,
    linear-gradient(#FFD500, #FFD500) 50% 50% / 32% 32% no-repeat,
    linear-gradient(#FF7300, #FF7300) 100% 50% / 32% 32% no-repeat,
    linear-gradient(#F8F8F8, #F8F8F8) 0 100% / 32% 32% no-repeat,
    linear-gradient(#FFD500, #FFD500) 50% 100% / 32% 32% no-repeat,
    linear-gradient(#D01C28, #D01C28) 100% 100% / 32% 32% no-repeat,
    #0b1220;
  padding: 2px;
}

.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab i { display: none; }
.tab {
  appearance: none; border: 1px solid var(--line); background: rgba(30, 41, 59, 0.6);
  color: var(--dim); padding: 8px 15px; border-radius: 999px; cursor: pointer;
  font: inherit; font-size: 0.9rem; transition: 120ms ease;
}
.tab:hover { color: var(--ink); border-color: var(--line-strong); }
.tab.is-on { background: rgba(59, 130, 246, 0.22); border-color: rgba(96, 165, 250, 0.6); color: #dbeafe; }

/* ---------------------------------------------------------------- layout */

main { padding: 22px 18px 40px; }
.panel { display: none; }
.panel.is-on { display: block; }

/* --------------------------------------------------------------- today */

.today-panel { max-width: 860px; margin: 0 auto; }
.today-hero { padding: clamp(18px, 5vw, 54px) 2px 22px; }
.today-hero h2 {
  max-width: 680px; margin: 3px 0 10px; font-size: clamp(1.8rem, 5vw, 3.2rem);
  line-height: 1.08; letter-spacing: -0.035em;
}
.today-lead { max-width: 650px; margin: 0; color: #cbd5e1; font-size: 1.02rem; }
.eyebrow {
  margin: 0; color: #93c5fd; font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
}
.today-card { padding: clamp(18px, 4vw, 30px); }
.today-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 20px; }
.field-label { display: grid; gap: 7px; color: #cbd5e1; font-size: 0.83rem; font-weight: 650; }
.field-label select,
.field-label input {
  width: 100%; min-width: 0; border: 1px solid var(--line-strong); border-radius: 10px;
  background: rgba(2, 6, 23, 0.7); color: var(--ink); padding: 10px 12px;
  font: inherit; font-weight: 400;
}
.field-label.compact { display: flex; align-items: center; gap: 8px; }
.field-label.compact .filter { width: 170px; }
.answer-field { flex: 1; min-width: 0; }
.answer-field input { display: block; }
.primary-action { min-height: 46px; padding-inline: 20px; font-weight: 700; }
.today-next { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.today-next h3 { margin-top: 4px; font-size: 1.35rem; }
.today-next .primary-action { flex: none; }
.today-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; margin-top: 22px; }
.today-meta div { padding: 10px 12px; border-top: 1px solid var(--line); }
.today-meta b { display: block; font-size: 1.25rem; }
.today-meta span { color: var(--dim); font-size: 0.76rem; }
.today-secondary { justify-content: space-between; }
.text-button {
  border: 0; background: transparent; color: var(--accent); padding: 8px 3px;
  cursor: pointer; font: inherit; font-size: 0.86rem; text-decoration: underline;
  text-underline-offset: 3px;
}
.status-line { min-height: 1.5em; margin: 12px 2px 0; color: #a7f3d0; font-size: 0.86rem; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.col-left, .col-right { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 18px;
}
.card h3 { margin: 0 0 8px; font-size: 1rem; letter-spacing: -0.01em; }
.muted { color: var(--dim); }
.small { font-size: 0.85rem; }
p { margin: 0 0 10px; }
p:last-child { margin-bottom: 0; }
a { color: var(--accent); }

.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 12px; }

.btn {
  appearance: none; border: 1px solid rgba(96, 165, 250, 0.45);
  background: rgba(59, 130, 246, 0.22); color: #dbeafe;
  padding: 8px 15px; border-radius: 10px; cursor: pointer; font: inherit; font-size: 0.9rem;
  transition: 120ms ease;
}
.btn:hover { background: rgba(59, 130, 246, 0.34); }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn.ghost { background: rgba(30, 41, 59, 0.7); border-color: var(--line); color: var(--ink); }
.btn.ghost:hover { border-color: var(--line-strong); }
.btn.tiny { padding: 5px 11px; font-size: 0.82rem; }
.btn.good { border-color: rgba(52, 211, 153, 0.5); background: rgba(52, 211, 153, 0.18); color: #a7f3d0; }
.btn.ok { border-color: rgba(251, 191, 36, 0.5); background: rgba(251, 191, 36, 0.16); color: #fde68a; }
.btn.bad { border-color: rgba(248, 113, 113, 0.5); background: rgba(248, 113, 113, 0.16); color: #fecaca; }

.speed { display: flex; gap: 8px; align-items: center; font-size: 0.82rem; color: var(--dim); margin-left: auto; }
.speed input { width: 110px; accent-color: var(--accent); }

/* ------------------------------------------------------------ step picker */

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin-bottom: 16px; }
.step-btn {
  text-align: left; cursor: pointer; font: inherit;
  border: 1px solid var(--line); background: var(--card2); color: inherit;
  border-radius: 14px; padding: 12px 14px; transition: 120ms ease;
}
.step-btn:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.step-btn.is-on { border-color: rgba(96, 165, 250, 0.65); background: rgba(59, 130, 246, 0.16); }
.step-btn .n { font-size: 0.72rem; letter-spacing: 0.09em; text-transform: uppercase; color: var(--dim); }
.step-btn .t { display: block; font-weight: 600; margin: 2px 0 3px; }
.step-btn .d { display: block; font-size: 0.82rem; color: var(--dim); }

/* ------------------------------------------------------------- algorithm */

.alg-big { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 12px; }
.mv {
  font-family: var(--mono); font-size: 1.05rem; font-weight: 600;
  background: rgba(30, 41, 59, 0.9); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; min-width: 40px; text-align: center;
}
.mv.rot { background: rgba(148, 163, 184, 0.14); color: #cbd5e1; font-style: italic; }
.mv.is-now { border-color: var(--accent); background: rgba(59, 130, 246, 0.3); color: #fff; }
.mv.done { opacity: 0.45; }

.moves { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; min-height: 30px; }
.sequence-source { color: var(--dim); text-align: center; margin: 5px 0 8px; }
.personal-sequence-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.moves .mv { font-size: 0.85rem; padding: 3px 7px; min-width: 30px; }

.hook { border-left: 3px solid rgba(96, 165, 250, 0.6); padding: 2px 0 2px 12px; margin: 10px 0; }
.hook strong { color: #bfdbfe; }

dl.facts { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; font-size: 0.9rem; }
dl.facts dt { color: var(--dim); }
dl.facts dd { margin: 0; }

/* ------------------------------------------------------------------ cube */

.cube-host { display: grid; place-items: center; padding: 8px 0 4px; }
.cube-stage { width: 100%; display: grid; place-items: center; }
.cube-scene {
  width: 260px; height: 260px; perspective: 1200px;
  display: grid; place-items: center; position: relative;
  touch-action: pan-y;                 /* sideways drag turns it, up-down still scrolls */
  cursor: grab;
}
.cube-scene.dragging { cursor: grabbing; }
.cube-shell { width: 0; height: 0; transform-style: preserve-3d; }
.cube-world { width: 0; height: 0; position: relative; transform-style: preserve-3d; }

.viewreset {
  position: absolute; right: 0; bottom: 0; z-index: 2;
  font: inherit; font-size: 0.72rem; cursor: pointer;
  background: rgba(15, 23, 42, 0.9); border: 1px solid var(--line);
  color: var(--dim); border-radius: 7px; padding: 3px 8px;
}
.viewreset:hover { color: var(--ink); border-color: var(--line-strong); }
.cubie { position: absolute; width: 56px; height: 56px; margin: -28px 0 0 -28px; transform-style: preserve-3d; }
.facelet {
  position: absolute; inset: 0; border-radius: 7px;
  border: 1px solid rgba(0, 0, 0, 0.55);
  box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.35);
  backface-visibility: hidden;
}
.c-Y { background: #FFD500; } .c-W { background: #F5F5F5; }
.c-G { background: #00A651; } .c-B { background: #0055BF; }
.c-O { background: #FF7300; } .c-R { background: #D01C28; }

.stage-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.stage-meta { color: var(--dim); font-size: 0.85rem; }
.timer { font-family: var(--mono); font-size: 0.95rem; color: var(--warn); }

/* --------------------------------------------------------------- diagrams */

.case-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 10px; }
.case {
  cursor: pointer; font: inherit; color: inherit; text-align: center;
  background: var(--card2); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 8px 8px; transition: 120ms ease;
}
.case:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.case.is-on { border-color: rgba(96, 165, 250, 0.7); background: rgba(59, 130, 246, 0.14); }
.case svg { width: 78px; height: 78px; display: block; margin: 0 auto 6px; }
.case .lbl { font-size: 0.74rem; color: var(--dim); line-height: 1.25; display: block; }
.case .reps { font-size: 0.7rem; color: #bfdbfe; }

.diagram-row { display: flex; gap: 14px; align-items: center; margin-top: 10px; }
.diagram-row svg { width: 104px; height: 104px; flex: none; }
.diagram-note { min-width: 0; }

/* ---------------------------------------------------------------- drill */

.drill-setup { margin-bottom: 16px; }
.drill-opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; align-items: start; }
.practice-modes { margin: 0 0 16px; padding: 12px; border: 1px solid var(--line); border-radius: 14px; }
.practice-modes legend { padding: 0 6px; font-weight: 750; }
.mode-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.mode-button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.expert-tag { font-size: .7em; opacity: .75; margin-left: 3px; text-transform: uppercase; letter-spacing: .05em; }
.mode-panel { margin: 12px 0; }
.recognition-choices { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; margin: 10px 0 14px; }
.recognition-choice { min-height: 48px; white-space: normal; }
.recognition-choice.good { border-color: var(--good); background: rgba(52, 211, 153, .14); }
.recognition-choice.bad { border-color: var(--bad); background: rgba(248, 113, 113, .12); }

@media (max-width: 560px) {
  .mode-buttons, .recognition-choices { display: grid; grid-template-columns: 1fr 1fr; }
}
fieldset { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin: 0; }
legend { padding: 0 6px; font-size: 0.76rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim); }
fieldset label { display: flex; gap: 8px; align-items: flex-start; font-size: 0.86rem; padding: 2px 0; cursor: pointer; }
fieldset input { accent-color: var(--accent); margin-top: 3px; }

.scoreboard { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; align-self: stretch; }
.score { background: var(--card2); border: 1px solid var(--line); border-radius: 12px; padding: 8px 10px; text-align: center; }
.score b { display: block; font-size: 1.35rem; line-height: 1.2; }
.score span { font-size: 0.7rem; letter-spacing: 0.07em; text-transform: uppercase; color: var(--dim); }

.answer { display: flex; gap: 8px; }
.answer input {
  flex: 1; min-width: 0; font-family: var(--mono); font-size: 1rem;
  background: rgba(2, 6, 23, 0.65); border: 1px solid var(--line);
  color: var(--ink); border-radius: 10px; padding: 9px 12px;
}
.answer input:focus { border-color: var(--accent); }

.keypad { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.keypad button {
  font-family: var(--mono); font-size: 0.85rem; cursor: pointer;
  background: rgba(30, 41, 59, 0.8); border: 1px solid var(--line);
  color: var(--ink); border-radius: 7px; padding: 4px 8px; min-width: 34px;
}
.keypad button:hover { border-color: var(--line-strong); }
.keypad button.util { color: var(--dim); }
.keypad .keymore { display: none; flex-wrap: wrap; gap: 5px; width: 100%; }
.keypad .keymore.is-open { display: flex; }

.verdict { margin-top: 10px; font-size: 0.9rem; min-height: 0; }
.verdict:empty { display: none; }
.verdict .ok { color: var(--good); }
.verdict .no { color: var(--bad); }
.verdict .meh { color: var(--warn); }

.setup-seq, .answer-box {
  font-family: var(--mono); font-size: 0.92rem; word-spacing: 0.35em;
  background: rgba(2, 6, 23, 0.55); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 12px; margin-top: 8px; overflow-wrap: anywhere;
}
.answer-box { border-color: rgba(52, 211, 153, 0.4); }
.answer-box .lead { display: block; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif; font-size: 0.8rem; color: var(--dim); margin-bottom: 4px; word-spacing: normal; }

.rating { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 12px; }

ol.walk { margin: 4px 0 0; padding-left: 20px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif; word-spacing: normal; font-size: 0.88rem; }
ol.walk li { margin-bottom: 3px; }
ol.walk code { font-family: var(--mono); background: rgba(2, 6, 23, 0.6); border-radius: 5px; padding: 1px 5px; }
details.raw { margin-top: 8px; font-size: 0.82rem; }
details.raw summary { cursor: pointer; color: var(--dim); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif; word-spacing: normal; }
details.raw[open] summary { margin-bottom: 5px; }

.bars { display: grid; gap: 8px; }
.bar-row { display: grid; grid-template-columns: 130px 1fr auto; gap: 10px; align-items: center; font-size: 0.84rem; }
.bar { height: 8px; border-radius: 99px; background: rgba(148, 163, 184, 0.18); overflow: hidden; }
.bar i { display: block; height: 100%; background: linear-gradient(90deg, #3b82f6, #34d399); border-radius: 99px; }

/* ---------------------------------------------------------- method switch */

.methodbar { border-bottom: 1px solid var(--line); background: rgba(2, 6, 23, 0.45); }
.methodbar .wrap { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 9px 18px; }
.mlabel { font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); }
.methods { display: flex; gap: 6px; flex-wrap: wrap; }
.mbtn {
  appearance: none; font: inherit; font-size: 0.86rem; cursor: pointer;
  border: 1px solid var(--line); background: rgba(30, 41, 59, 0.7); color: var(--dim);
  padding: 5px 13px; border-radius: 8px; transition: 120ms ease;
}
.mbtn:hover { color: var(--ink); border-color: var(--line-strong); }
.mbtn.is-on { background: rgba(52, 211, 153, 0.16); border-color: rgba(52, 211, 153, 0.55); color: #a7f3d0; }
.mnote { font-size: 0.82rem; color: var(--dim); }
body.no-method .methodbar { display: none; }

.filter {
  font: inherit; font-size: 0.85rem; width: 150px;
  background: rgba(2, 6, 23, 0.6); border: 1px solid var(--line);
  color: var(--ink); border-radius: 8px; padding: 5px 10px;
}
.filter:focus { border-color: var(--accent); }

/* -------------------------------------------------------- reading a move */

.movepic { width: 40px; height: 40px; flex: none; }

.reader summary { cursor: pointer; list-style: none; }
.reader summary::-webkit-details-marker { display: none; }
.reader summary h3 { display: inline-block; margin: 0; }
.reader summary::after { content: ' ▾'; color: var(--dim); }
.reader[open] summary::after { content: ' ▴'; }

.readrow {
  display: flex; gap: 11px; align-items: center; padding: 6px 8px;
  border-radius: 9px; font-size: 0.86rem; border: 1px solid transparent;
}
.readrow + .readrow { margin-top: 2px; }
.readrow:nth-child(odd) { background: rgba(30, 41, 59, 0.4); }
.readrow.is-now { border-color: rgba(96, 165, 250, 0.65); background: rgba(59, 130, 246, 0.18); }
.readrow b { font-family: var(--mono); color: #bfdbfe; }
.readrow .aside { display: block; color: var(--dim); font-size: 0.78rem; }

.rules3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; margin: 12px 0; }
.rules3 div { background: var(--card2); border: 1px solid var(--line); border-radius: 11px; padding: 10px 12px; }
.rules3 b { display: block; margin-bottom: 3px; }
.rules3 span { font-size: 0.84rem; color: var(--dim); }

.warn-line {
  border-left: 3px solid rgba(251, 191, 36, 0.6);
  padding: 4px 0 4px 12px; margin: 12px 0;
}

.movebook { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 9px; margin-top: 12px; }
.movecard {
  display: flex; gap: 10px; align-items: center;
  background: var(--card2); border: 1px solid var(--line); border-radius: 11px; padding: 8px 10px;
}
.movecard b { font-family: var(--mono); font-size: 1rem; color: #bfdbfe; }
.movecard span { display: block; font-size: 0.76rem; color: var(--dim); line-height: 1.35; }

.named { background: var(--card2); border: 1px solid var(--line); border-radius: 11px; padding: 9px 12px; margin-bottom: 8px; }
.named .seq { font-family: var(--mono); font-size: 0.86rem; color: #bfdbfe; margin-top: 4px; overflow-wrap: anywhere; }
.tagbit {
  display: inline-block; font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase;
  background: rgba(59, 130, 246, 0.25); color: #dbeafe; border-radius: 5px;
  padding: 2px 6px; margin-right: 7px;
}
.tagbit.done { background: rgba(52, 211, 153, 0.2); color: #a7f3d0; }

.known.next { color: var(--warn); }

/* ------------------------------------------------------------- reference */

.notation { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-bottom: 12px; }
.note-item { background: var(--card2); border: 1px solid var(--line); border-radius: 10px; padding: 8px 11px; }
.note-item b { font-family: var(--mono); color: #bfdbfe; }
.note-item span { display: block; font-size: 0.82rem; color: var(--dim); }

.sheet { display: grid; gap: 10px; }
.sheet-row { display: grid; grid-template-columns: 26px 1fr; gap: 12px; align-items: start; background: var(--card2); border: 1px solid var(--line); border-radius: 12px; padding: 11px 13px; }
.sheet-row .num { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; background: rgba(59, 130, 246, 0.22); color: #dbeafe; font-size: 0.82rem; font-weight: 700; }
.sheet-row h4 { margin: 0 0 4px; font-size: 0.95rem; }
.sheet-row code { font-family: var(--mono); background: rgba(2, 6, 23, 0.55); border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px; display: inline-block; margin: 3px 4px 0 0; }
.sheet-row .known { color: var(--good); font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; }

.pit { display: grid; gap: 8px; }
.pit div { background: var(--card2); border: 1px solid var(--line); border-left: 3px solid rgba(248, 113, 113, 0.55); border-radius: 10px; padding: 9px 12px; font-size: 0.88rem; }
.pit b { color: #fecaca; }

.plan-step { background: var(--card2); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin-bottom: 8px; }
.plan-step .ph { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
.plan-step h4 { margin: 0; font-size: 0.9rem; }
.plan-step .seq { font-family: var(--mono); font-size: 0.86rem; color: #bfdbfe; margin-top: 4px; overflow-wrap: anywhere; }

.foot { padding: 0 18px 28px; color: var(--dim); font-size: 0.82rem; }

/* ----------------------------------------------------------------- plan */

.plan-intro .plan-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }

.stage {
  background: var(--card); border: 1px solid var(--line);
  border-left: 3px solid var(--line); border-radius: 14px;
  padding: 13px 16px; margin-bottom: 10px;
}
.stage.done { border-left-color: rgba(52, 211, 153, 0.75); }
.stage.next { border-left-color: rgba(96, 165, 250, 0.85); background: rgba(59, 130, 246, 0.07); }
.stage.going { border-left-color: rgba(251, 191, 36, 0.7); }
.stage p { margin: 0 0 7px; }

.stage > summary { list-style: none; cursor: pointer; }
.stage > summary::-webkit-details-marker { display: none; }
.stage > summary::after { content: none; }
.stage-title h4 { display: block; }
.stage-title .cost { display: block; }
.stage[open] > summary { margin-bottom: 4px; }
.stage > summary .bar-row { margin-bottom: 0; }

.stage-top { display: flex; gap: 11px; align-items: center; margin-bottom: 8px; }
.stage-num {
  width: 26px; height: 26px; flex: none; border-radius: 8px; display: grid; place-items: center;
  background: rgba(148, 163, 184, 0.16); color: var(--dim); font-size: 0.8rem; font-weight: 700;
}
.stage.done .stage-num { background: rgba(52, 211, 153, 0.2); color: #a7f3d0; }
.stage.next .stage-num { background: rgba(59, 130, 246, 0.28); color: #dbeafe; }
.stage-title { flex: 1; min-width: 0; }
.stage-title h4 { margin: 0; font-size: 0.98rem; }
.stage-title .cost { font-size: 0.75rem; color: var(--dim); }
.pill {
  font-size: 0.68rem; letter-spacing: 0.07em; text-transform: uppercase;
  border-radius: 999px; padding: 3px 9px; white-space: nowrap;
  background: rgba(148, 163, 184, 0.14); color: var(--dim);
}
.pill.done { background: rgba(52, 211, 153, 0.18); color: #a7f3d0; }
.pill.next { background: rgba(59, 130, 246, 0.25); color: #dbeafe; }
.pill.going { background: rgba(251, 191, 36, 0.18); color: #fde68a; }

.stage .bar-row { grid-template-columns: auto 1fr auto; margin: 9px 0; }
.stage-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.milestone {
  margin-top: 10px; font-size: 0.83rem; border-radius: 9px; padding: 7px 11px;
  background: rgba(52, 211, 153, 0.12); color: #a7f3d0;
  border: 1px solid rgba(52, 211, 153, 0.3);
}
.milestone.pending { background: rgba(148, 163, 184, 0.08); color: var(--dim); border-color: var(--line); }

/* --------------------------------------------------------- drill chrome */

.drillbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.drillbar .scoreboard { flex: 1; min-width: 210px; }
.focusnote {
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  background: rgba(59, 130, 246, 0.14); border: 1px solid rgba(96, 165, 250, 0.4);
  border-radius: 11px; padding: 8px 12px; font-size: 0.85rem;
}
.focusnote[hidden] { display: none; }

.seq-row { display: flex; gap: 8px; align-items: flex-start; }
.seq-row .setup-seq { flex: 1; min-width: 0; }
.seq-row .copy { margin-top: 8px; flex: none; }

details > summary { cursor: pointer; list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details > summary h3 { display: inline-block; margin: 0; }
details > summary::after { content: ' ▾'; color: var(--dim); }
details[open] > summary::after { content: ' ▴'; }
details[open] > summary { margin-bottom: 9px; }

/* ------------------------------------------------------------ responsive */

@media (max-width: 900px) {
  .split { grid-template-columns: minmax(0, 1fr); }
  /* on Learn the cube belongs above the wall of text; everywhere else the
     natural order already puts the thing you look at first */
  #tab-learn .col-right { order: -1; }
}

@media (max-width: 700px) {
  /* The one tablist becomes a thumb-reachable bar at the bottom. */
  .top .wrap { padding: 9px 16px; }
  .brand h1 { font-size: 1.05rem; }
  .brand p { display: none; }
  .logo { width: 28px; height: 28px; }

  body { padding-bottom: calc(70px + env(safe-area-inset-bottom, 0px)); }
  .tabs.primary-nav {
    display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
    gap: 0; padding: 4px 4px calc(4px + env(safe-area-inset-bottom, 0px));
    background: rgba(9, 14, 28, 0.96); border-top: 1px solid var(--line);
    backdrop-filter: blur(10px); flex-wrap: nowrap;
  }
  .tabs.primary-nav .tab {
    flex: 1; border: none; background: none; border-radius: 10px;
    display: flex; flex-direction: column; align-items: center; gap: 1px;
    padding: 6px 1px; font-size: 0.64rem; min-width: 0; min-height: 48px; justify-content: center;
  }
  .tabs.primary-nav .tab i { display: block; font-style: normal; font-size: 1rem; line-height: 1; }
  .tabs.primary-nav .tab.is-on { background: rgba(59, 130, 246, 0.2); color: #dbeafe; }

  .methodbar .wrap { padding: 7px 16px; gap: 8px; }
  .mlabel, .mnote { display: none; }
  .methods { width: 100%; }
  .mbtn { flex: 1; min-height: 38px; font-size: 0.8rem; padding: 5px 6px; }

  main { padding: 14px 16px 30px; }
  .wrap { padding: 0 16px; }
  .card { padding: 13px 14px; border-radius: 14px; }
  .hide-narrow { display: none; }

  /* every tappable thing gets a finger-sized target */
  fieldset label { padding: 7px 0; min-height: 40px; align-items: center; }
  fieldset input { width: 20px; height: 20px; margin-top: 0; }
  .keypad button { min-height: 40px; min-width: 42px; font-size: 0.95rem; }
  .btn { min-height: 42px; }
  .btn.tiny { min-height: 38px; }
  details > summary { padding: 6px 0; }
  .speed input { height: 30px; }
  .answer input { min-height: 44px; font-size: 16px; }  /* 16px stops iOS zooming in */
  .filter { min-height: 38px; font-size: 16px; }
  .tab { min-height: 42px; }
  .today-hero { padding-top: 22px; }
  .today-fields { grid-template-columns: 1fr; gap: 13px; }
  .today-next { align-items: stretch; flex-direction: column; gap: 14px; }
  .today-next .primary-action { width: 100%; }
}

@media (max-width: 560px) {
  .cube-scene { width: 210px; height: 210px; }
  .cube-shell { transform: scale(0.78); }
  .scoreboard { grid-template-columns: repeat(3, 1fr); }
  .bar-row { grid-template-columns: 1fr auto auto; gap: 8px; font-size: 0.8rem; }
  .bar-row .bar { grid-column: 1 / -1; grid-row: 2; }
  /* the step cards should not eat a whole phone screen */
  .steps { grid-template-columns: 1fr 1fr; gap: 8px; }
  .step-btn { padding: 9px 10px; border-radius: 11px; min-height: 52px; }
  .step-btn .t { font-size: 0.88rem; margin: 1px 0 0; }
  .step-btn .d { display: none; }
  .case svg { width: 62px; height: 62px; }
  .case-grid { grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 8px; }
  .case .lbl { font-size: 0.7rem; }
  .diagram-row { gap: 10px; }
  .diagram-row svg { width: 88px; height: 88px; }
  .movebook { grid-template-columns: 1fr; }
  .rules3 { grid-template-columns: 1fr; }
  .stage-top { flex-wrap: wrap; }
  .plan-intro .plan-summary { grid-template-columns: repeat(3, 1fr); }
  .speed { margin-left: 0; width: 100%; }
  .speed input { flex: 1; }
}

@media (max-width: 380px) {
  .cube-scene { width: 190px; height: 190px; }
  .cube-shell { transform: scale(0.7); }
  .case-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .btn, .tab, .case, .step-btn, .mbtn { transition: none; }
}