/* iOS Academy — shared styles for the course home + lesson engine.
   Fully offline, no web fonts, matches the kit's premium dark aesthetic. */

:root {
  --bg: #0e1116;
  --surface: #161b22;
  --surface2: #1c232d;
  --border: #2b3442;
  --ink: #e6edf3;
  --muted: #94a3b8;
  --accent: #a5b4fc;
  --accent2: #f0abfc;
  --good: #6ee7b7;
  --bad: #fda4af;
  --warn: #fcd34d;
  --r: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); line-height: 1.55;
  min-height: 100svh;
  padding-bottom: env(safe-area-inset-bottom);
}
a { color: var(--accent); text-decoration: none; }
button { font-family: inherit; }
code { font-family: var(--mono); font-size: .92em; background: rgba(165,180,252,.12); padding: 1px 5px; border-radius: 5px; }
b, strong { color: #fff; }

/* ---------- Shared shell ---------- */
.wrap { max-width: 820px; margin: 0 auto; padding: 0 16px 60px; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px calc(10px);
  padding-top: calc(10px + env(safe-area-inset-top));
  background: rgba(14,17,22,.88); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar .back { font-size: 14px; color: var(--muted); white-space: nowrap; }
.topbar .back:hover { color: var(--accent); }
.topbar .restart {
  appearance: none; cursor: pointer; width: 28px; height: 28px; border-radius: 8px;
  background: var(--surface2); border: 1px solid var(--border); color: var(--muted);
  font-size: 15px; line-height: 1; padding: 0;
}
.topbar .restart:hover { color: var(--accent); border-color: var(--accent); }
.topbar .bar { flex: 1; height: 10px; border-radius: 999px; background: var(--surface2); overflow: hidden; }
.topbar .bar i {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 999px; transition: width .35s cubic-bezier(.2,.8,.2,1);
}
.topbar .xp { font-size: 13px; font-weight: 700; color: var(--warn); white-space: nowrap; min-width: 52px; text-align: right; }

/* ---------- Cards (lesson flow) ---------- */
.stage { padding-top: 22px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r);
  box-shadow: var(--shadow); padding: 22px 20px; margin: 0 0 16px;
  animation: card-in .38s cubic-bezier(.2,.8,.2,1) backwards;
}
@keyframes card-in { from { opacity: 0; transform: translateY(16px) scale(.985); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .card { animation: none; } .topbar .bar i { transition: none; } }

.card .kick {
  font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 8px; display: flex; align-items: center; gap: 8px;
}
.card .kick .tagx { margin-left: auto; font-size: 10px; color: var(--muted); letter-spacing: .08em; }
.card h2 { margin: 0 0 10px; font-size: 21px; line-height: 1.3; }
.card .body { font-size: 15.5px; color: #cbd5e1; }
.card .body p { margin: 10px 0; }
.card .body ul { margin: 10px 0; padding-left: 22px; }
.card .body li { margin: 6px 0; }

.card pre {
  margin: 14px 0; padding: 14px 16px; overflow-x: auto;
  background: #0b0e13; border: 1px solid var(--border); border-radius: 12px;
  font-family: var(--mono); font-size: 13.5px; line-height: 1.55; color: #dbe4ee;
  -webkit-overflow-scrolling: touch;
}
.card .out {
  margin: -6px 0 14px; padding: 10px 16px; border-radius: 12px;
  background: rgba(110,231,183,.08); border: 1px dashed rgba(110,231,183,.4);
  font-family: var(--mono); font-size: 13px; color: var(--good); white-space: pre-wrap;
}
.card .out::before { content: "▸ prints  "; color: var(--muted); font-family: var(--font); font-size: 11px; letter-spacing: .08em; }
.card .note { margin-top: 12px; font-size: 13.5px; color: var(--muted); border-left: 3px solid var(--accent); padding-left: 12px; }

/* step-through executor / task / actor diagrams */
.timeline {
  --lanes: 2; margin: 16px 0 4px; padding: 14px; overflow-x: auto;
  background: #0b0e13; border: 1px solid var(--border); border-radius: 14px;
}
.tl-head, .tl-row { display: grid; grid-template-columns: repeat(var(--lanes), minmax(120px, 1fr)); gap: 8px; min-width: calc(var(--lanes) * 128px); }
.tl-head { position: sticky; top: 0; z-index: 2; }
.tl-lane {
  padding: 7px 8px; border-radius: 9px; text-align: center;
  background: var(--surface2); border: 1px solid var(--border); color: var(--accent);
  font-size: 11px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase;
}
.tl-cell { position: relative; min-height: 58px; display: grid; place-items: center; padding: 6px; }
.tl-cell::before { content: ""; position: absolute; top: -8px; bottom: -8px; left: 50%; width: 2px; background: rgba(148,163,184,.18); }
.tl-event {
  position: relative; z-index: 1; width: 100%; padding: 9px 8px; border-radius: 10px;
  background: var(--surface2); border: 1px solid var(--accent); color: var(--ink);
  text-align: center; font-size: 12.5px; line-height: 1.35;
  transition: opacity .25s ease, transform .25s ease;
}
.tl-event.good { border-color: var(--good); background: rgba(110,231,183,.10); }
.tl-event.warn { border-color: var(--warn); background: rgba(252,211,77,.10); }
.tl-event.bad { border-color: var(--bad); background: rgba(253,164,175,.10); }
.tl-row.future .tl-event { visibility: hidden; opacity: 0; transform: translateY(6px); }
.tl-row.shown .tl-event { animation: card-in .28s ease backwards; }
.tl-status { min-height: 48px; margin-top: 8px; padding: 11px 12px; border-radius: 10px; background: var(--surface2); color: #cbd5e1; font-size: 13.5px; }
.timeline + .act .btn.ghost { flex: 0 0 48px; padding: 12px; }

/* deliberate-practice code card */
.lab-editor {
  width: 100%; min-height: 250px; margin-top: 14px; padding: 14px 16px; resize: vertical;
  background: #0b0e13; border: 1px solid var(--border); border-radius: 12px;
  color: #dbe4ee; font-family: var(--mono); font-size: 13.5px; line-height: 1.55;
  tab-size: 4;
}
.lab-editor:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(165,180,252,.10); }
.lab-checks { margin-top: 14px; padding: 12px 14px; border-radius: 12px; background: var(--surface2); border: 1px solid var(--border); }
.lab-check-title { margin-bottom: 7px; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.lab-checks label { display: flex; align-items: flex-start; gap: 9px; margin: 7px 0; color: #cbd5e1; font-size: 13.5px; }
.lab-checks input { margin-top: 3px; accent-color: var(--good); }
.lab-solution { display: none; margin-top: 16px; }
.lab-solution.open { display: block; animation: card-in .3s ease backwards; }
@media (prefers-reduced-motion: reduce) {
  .tl-event { transition: none; }
  .tl-row.shown .tl-event, .lab-solution.open { animation: none; }
}
@media (max-width: 560px) {
  .timeline { padding: 10px; }
  .lab-editor { min-height: 300px; font-size: 12.5px; }
}

/* option buttons */
.opts { display: grid; gap: 10px; margin-top: 16px; }
.opt {
  text-align: left; width: 100%; padding: 13px 15px; border-radius: 12px;
  background: var(--surface2); border: 1px solid var(--border); color: var(--ink);
  font-size: 15px; line-height: 1.45; cursor: pointer;
  transition: transform .12s ease, border-color .12s ease, background .12s ease;
}
.opt code { background: rgba(165,180,252,.14); }
.opt:hover:not(:disabled) { border-color: var(--accent); transform: translateY(-1px); }
.opt:active:not(:disabled) { transform: scale(.99); }
.opt:disabled { cursor: default; opacity: .55; }
.opt.sel { border-color: var(--accent); background: rgba(165,180,252,.10); opacity: 1; }
.opt.right { border-color: var(--good); background: rgba(110,231,183,.12); color: #fff; opacity: 1; }
.opt.wrong { border-color: var(--bad); background: rgba(253,164,175,.10); opacity: 1; animation: shake .3s ease; }
@keyframes shake { 25% { transform: translateX(-4px);} 75% { transform: translateX(4px);} }
.opt .k {
  display: inline-grid; place-items: center; width: 20px; height: 20px; margin-right: 9px;
  border-radius: 6px; background: rgba(165,180,252,.15); color: var(--accent);
  font-size: 11px; font-weight: 800; vertical-align: 1px;
}
.opt.right .k { background: rgba(110,231,183,.25); color: var(--good); }
.opt.wrong .k { background: rgba(253,164,175,.2); color: var(--bad); }

/* type-in */
.type-in {
  width: 100%; margin-top: 16px; padding: 13px 15px; border-radius: 12px;
  background: #0b0e13; border: 1px solid var(--border); color: var(--ink);
  font-size: 16px; font-family: var(--mono);
}
.type-in:focus { outline: none; border-color: var(--accent); }

/* feedback panel */
.fb { margin-top: 16px; padding: 14px 16px; border-radius: 12px; font-size: 14.5px; animation: card-in .3s ease backwards; }
.fb.good { background: rgba(110,231,183,.10); border: 1px solid rgba(110,231,183,.45); }
.fb.bad  { background: rgba(253,164,175,.08); border: 1px solid rgba(253,164,175,.45); }
.fb .fh { font-weight: 800; margin-bottom: 4px; }
.fb.good .fh { color: var(--good); }
.fb.bad .fh { color: var(--bad); }
.fb .why { color: #cbd5e1; }
.fb .ask { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--border); color: var(--muted); font-size: 13.5px; }

/* reveal card */
.reveal-body { filter: blur(9px); transition: filter .4s ease; pointer-events: none; user-select: none; }
.reveal-body.open { filter: none; pointer-events: auto; user-select: auto; }

/* recap */
.recap li { margin: 8px 0; }
.recap li::marker { content: "✦ "; color: var(--accent2); }

/* action row */
.act { display: flex; gap: 10px; margin-top: 18px; }
.btn {
  appearance: none; border: none; cursor: pointer; border-radius: 999px;
  padding: 13px 26px; font-size: 15px; font-weight: 800; color: #0b0e13;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  box-shadow: 0 6px 20px rgba(165,180,252,.25);
  transition: transform .12s ease, box-shadow .12s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(165,180,252,.35); }
.btn:active { transform: scale(.98); }
.btn.ghost { background: var(--surface2); color: var(--ink); border: 1px solid var(--border); box-shadow: none; }
.btn.full { width: 100%; }

/* combo toast */
.toast {
  position: fixed; left: 50%; top: 18%; transform: translateX(-50%);
  background: var(--surface); border: 1px solid var(--warn); color: var(--warn);
  padding: 8px 18px; border-radius: 999px; font-weight: 800; font-size: 14px;
  box-shadow: var(--shadow); z-index: 50; pointer-events: none;
  animation: toast-pop 1.1s ease forwards;
}
@keyframes toast-pop {
  0% { opacity: 0; transform: translateX(-50%) translateY(8px) scale(.9); }
  15%, 75% { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
  100% { opacity: 0; transform: translateX(-50%) translateY(-10px) scale(.95); }
}

/* ---------- End screen ---------- */
.done-wrap { text-align: center; padding-top: 30px; }
.done-wrap .big { font-size: 52px; margin-bottom: 4px; }
.done-wrap h2 { font-size: 24px; line-height: 1.25; margin: 8px 0; }
.done-wrap .sub { color: var(--muted); font-size: 14.5px; }
.ring { margin: 22px auto 8px; width: 150px; height: 150px; position: relative; }
.ring svg { transform: rotate(-90deg); }
.ring .pct { position: absolute; inset: 0; display: grid; place-items: center; font-size: 28px; font-weight: 800; }
.ring .pct small { display: block; font-size: 11px; color: var(--muted); font-weight: 600; letter-spacing: .08em; }
.stars { font-size: 30px; letter-spacing: 6px; margin: 6px 0 2px; }
.stars .off { opacity: .22; filter: grayscale(1); }
.statrow { display: flex; justify-content: center; gap: 12px; margin: 18px 0 8px; flex-wrap: wrap; }
.stat {
  min-width: 108px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 16px;
}
.stat .v { font-size: 20px; font-weight: 800; }
.stat .l { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.stat .v.xp { color: var(--warn); }
.stat .v.gd { color: var(--good); }
.done-wrap .act { justify-content: center; margin-top: 22px; }

/* ---------- Home (course path) ---------- */
.hero { padding: 34px 0 10px; }
.hero .badge {
  display: inline-block; font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--accent); border-radius: 999px; padding: 3px 12px;
}
.hero h1 { margin: 12px 0 6px; font-size: 30px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lede { color: var(--muted); font-size: 15px; max-width: 560px; }

.statsbar { display: flex; gap: 10px; margin: 20px 0 6px; flex-wrap: wrap; }
.pillstat {
  display: flex; align-items: center; gap: 8px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 999px; padding: 8px 16px; font-size: 14px; font-weight: 700;
}
.pillstat .ico { font-size: 16px; }
.pillstat .lab { color: var(--muted); font-weight: 600; font-size: 12px; }

.cta {
  display: block; margin: 18px 0 6px; padding: 18px 20px; border-radius: var(--r);
  background: linear-gradient(120deg, rgba(165,180,252,.16), rgba(240,171,252,.10)), var(--surface);
  border: 1px solid var(--accent); box-shadow: var(--shadow); color: var(--ink);
  transition: transform .15s ease;
}
.cta:hover { transform: translateY(-2px); }
.cta .tag { font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.cta h3 { margin: 4px 0 2px; font-size: 18px; }
.cta p { margin: 0; color: var(--muted); font-size: 13.5px; }

.unit { margin-top: 30px; }
.unit-head {
  display: flex; align-items: center; gap: 14px; padding: 16px 18px;
  border-radius: var(--r); background: var(--surface); border: 1px solid var(--border);
}
.unit-head .em { font-size: 28px; }
.unit-head h2 { margin: 0; font-size: 17px; }
.unit-head .tg { color: var(--muted); font-size: 13px; margin-top: 1px; }
.unit-head .prog { margin-left: auto; text-align: right; font-size: 12px; color: var(--muted); white-space: nowrap; }
.unit-head .prog b { display: block; font-size: 15px; color: var(--ink); }

.path { list-style: none; margin: 0; padding: 6px 0 0 26px; position: relative; }
.path::before {
  content: ""; position: absolute; left: 43px; top: 8px; bottom: 8px;
  width: 3px; border-radius: 2px; background: var(--surface2);
}
.node { position: relative; margin: 10px 0; }
.node a {
  display: flex; align-items: center; gap: 14px; padding: 12px 14px 12px 4px;
  border-radius: 14px; color: var(--ink);
}
.node a:hover { background: rgba(165,180,252,.06); }
.node .dot {
  position: relative; z-index: 1; flex: none; width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; font-size: 16px; font-weight: 800;
  background: var(--surface2); border: 2px solid var(--border); color: var(--muted);
}
.node.done .dot { background: rgba(110,231,183,.15); border-color: var(--good); color: var(--good); }
.node.next .dot {
  background: linear-gradient(120deg, var(--accent), var(--accent2)); border-color: transparent; color: #0b0e13;
  box-shadow: 0 0 0 0 rgba(165,180,252,.5); animation: pulse 1.8s ease infinite;
}
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(165,180,252,.45); } 70% { box-shadow: 0 0 0 12px rgba(165,180,252,0); } 100% { box-shadow: 0 0 0 0 rgba(165,180,252,0); } }
@media (prefers-reduced-motion: reduce) { .node.next .dot { animation: none; } }
.node .nt { flex: 1; min-width: 0; }
.node .nt .t { font-size: 15px; font-weight: 700; }
.node .nt .m { font-size: 12px; color: var(--muted); }
.node .st { font-size: 13px; letter-spacing: 2px; white-space: nowrap; }
.node .st .off { opacity: .2; filter: grayscale(1); }
.node.boss .dot { border-style: dashed; }
.node.boss.next .dot { border-style: solid; }
.node.boss .nt .t::after { content: " · unit review"; font-size: 11px; color: var(--accent2); font-weight: 600; }

.foot { margin-top: 46px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12.5px; }
.foot a { color: var(--accent); }

/* sound pill */
.sndpill {
  position: fixed; right: 14px; bottom: calc(14px + env(safe-area-inset-bottom)); z-index: 40;
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--surface); color: var(--ink); font-size: 16px; cursor: pointer; box-shadow: var(--shadow);
}
@media (max-width: 480px) {
  .card { padding: 18px 15px; }
  .card h2 { font-size: 19px; }
  .hero h1 { font-size: 25px; }
}