/* Prototype Lab — the "page 2" look: light, one blue, the work is the spine. */
:root {
  --bg: #f4f5f7; --card: #ffffff; --line: #e2e5ea; --line-strong: #d3d7de;
  --ink: #1f2430; --body: #4b5563; --muted: #6b7280; --faint: #9aa1ad;
  --accent: #3b5bdb; --accent-soft: #f0f3f9; --accent-line: #c9d1ea;
  --green: #1f7a4d; --green-soft: #e3f5ea; --amber: #b26a00; --amber-soft: #fff7e6; --red: #b42318; --red-soft: #fdecec;
  --radius: 12px;
}
* { box-sizing: border-box; }
/* The page toggles visibility with the `hidden` attribute; a CSS `display` on the same
   element would silently win over it. Make hidden always mean hidden. */
[hidden] { display: none !important; }
html, body { height: 100%; }
body { margin: 0; font: 15px/1.5 Manrope, "Segoe UI", system-ui, sans-serif; color: var(--ink); background: var(--bg); }
a { color: var(--accent); }
.center { text-align: center; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.quiet { color: var(--body); margin: .25rem 0 .75rem; }
.mono { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 12px; }
.label { display: block; font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin: 0 0 .4rem; }
.label.accent { color: var(--accent); }
.err { color: var(--red); margin: .5rem 0 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.help { margin: 0 0 .9rem; color: var(--body); }

/* Buttons */
button, .button-link { font: inherit; font-weight: 700; font-size: 14px; border-radius: 10px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
button { border: 0; background: transparent; color: var(--ink); }
.primary { height: 40px; padding: 0 18px; background: var(--accent); color: #fff; }
.primary.dark { background: var(--ink); }
.primary:disabled { background: var(--line-strong); color: var(--muted); cursor: not-allowed; }
.secondary { height: 40px; padding: 0 16px; background: #fff; border: 1px solid var(--line-strong); color: var(--ink); }
.ghost { color: var(--accent); background: transparent; padding: 0 6px; }
.tiny { height: 28px; font-size: 12px; padding: 0 8px; }
.danger { height: 36px; padding: 0 14px; background: var(--red); color: #fff; }
button:disabled { opacity: .7; }

/* Inputs */
label { display: block; font-weight: 700; margin: 0 0 .3rem; font-size: 14px; }
input, textarea { width: 100%; padding: .65rem .8rem; margin: 0 0 .9rem; font: inherit; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink); }
textarea { resize: vertical; line-height: 1.5; }
input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Brand */
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 16px; }
.brand-mark { width: 30px; height: 30px; border-radius: 7px; background: var(--accent); color: #fff; display: inline-grid; place-items: center; font-size: 10px; font-weight: 800; letter-spacing: .04em; flex-shrink: 0; }

/* Auth */
.auth { min-height: 100%; display: grid; place-items: center; padding: 2rem 1rem; }
.auth-card { width: 100%; max-width: 440px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px; }
.lede { color: var(--body); margin: .75rem 0 1.25rem; }
.tabs { display: flex; gap: 4px; margin: 0 0 1rem; padding: 3px; border-radius: 10px; background: var(--bg); }
.tab { flex: 1; height: 34px; border-radius: 8px; color: var(--muted); font-weight: 700; }
.tab[aria-selected="true"] { background: #fff; color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,.06); }

/* Top bar */
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 60px; padding: 0 32px; background: #fff; border-bottom: 1px solid var(--line); }
.stages { display: flex; gap: 22px; }
.stage-link { height: 60px; padding: 0; font-size: 13px; color: var(--faint); border-bottom: 2px solid transparent; border-radius: 0; }
.stage-link.done { color: var(--green); }
.stage-link.current { color: var(--ink); border-bottom-color: var(--ink); }
.meter { display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.meter .dot { color: var(--line-strong); }

/* Body grid: work + rail; flips at stage 5 */
.body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; padding: 28px 32px; align-items: start; }
.work { display: flex; flex-direction: column; gap: 12px; max-width: 860px; width: 100%; margin: 0 auto; }
.body.stage-5 { grid-template-columns: 300px minmax(0, 1fr); }
.body.stage-5 .work { max-width: none; }
.stage-link { white-space: nowrap; }
@media (max-width: 1000px) {
  .body, .body.stage-5 { grid-template-columns: 1fr; padding: 16px; }
  .top { padding: 0 16px; } .stages { gap: 12px; } .meter #student-name { display: none; }
}

/* Stage cards */
.stage-row { width: 100%; display: flex; justify-content: flex-start; align-items: center; gap: 14px; padding: 14px 18px; text-align: left; border-radius: var(--radius); font-weight: 700; color: var(--body); }
.stage-row .num { width: 26px; height: 26px; border-radius: 999px; border: 2px solid var(--line-strong); display: grid; place-items: center; font-size: 12px; font-weight: 800; color: var(--faint); flex-shrink: 0; }
.stage-summary { flex: 1; min-width: 0; font-weight: 500; color: var(--muted); font-size: 13px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.stage-edit { font-size: 12px; color: var(--accent); }
.stage-body { display: none; padding: 4px 28px 24px; }
.stage.open { border-color: var(--accent-line); }
.stage.open .stage-body { display: block; }
.stage.open .stage-row { padding: 22px 28px 10px; }
.stage.open .stage-title { font-size: 22px; font-weight: 800; letter-spacing: -.01em; color: var(--ink); }
.stage.open .stage-summary, .stage.open .stage-edit { display: none; }
.stage.current .num { background: var(--accent); border-color: var(--accent); color: #fff; }
.stage.done .num { background: var(--green); border-color: var(--green); color: #fff; }
.stage.locked .stage-edit { color: var(--muted); }
.stage.locked.open .stage-body { opacity: .72; }
.stage.locked.open .stage-body textarea, .stage.locked.open .stage-body input { background: var(--bg); color: var(--muted); }
.stage.locked.open .stage-body button, .stage.locked.open .stage-body .button-link { pointer-events: none; }
.lock-note { margin: 0 0 .9rem; padding: 8px 12px; border-radius: 8px; background: var(--amber-soft); color: var(--amber); font-size: 13px; font-weight: 700; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.row.end { justify-content: flex-end; }
.actions { display: flex; gap: 10px; align-items: center; }

/* Habit tiles (stage 1) */
.habits { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 0 0 1rem; }
.habit { display: flex; gap: 10px; padding: 12px 14px; border-radius: 10px; font-size: 13.5px; line-height: 1.45; background: var(--accent-soft); }
.habit.ok { background: var(--green-soft); }
.habit.gap { background: var(--amber-soft); }
.habit svg { flex-shrink: 0; margin-top: 2px; }

/* Pictures */
.slots { display: flex; gap: 10px; }
.slot { position: relative; width: 96px; }
.slot img { display: block; width: 96px; height: 68px; object-fit: cover; border-radius: 8px; border: 1px solid var(--line); }
.slot .drop { display: grid; place-items: center; width: 96px; height: 68px; border: 2px dashed var(--line-strong); border-radius: 8px; color: var(--faint); font-size: 12px; font-weight: 700; cursor: pointer; margin: 0; }
.slot .drop:hover { border-color: var(--accent); color: var(--accent); }
.slot .remove { position: absolute; top: 2px; right: 2px; background: rgba(255,255,255,.92); }

/* Build panel (lives inside stage 3 or 4) */
.build-panel { display: flex; flex-direction: column; gap: 14px; margin: 0 0 1rem; }
.last-build .did { padding: 14px 16px; border-radius: 10px; background: var(--accent-soft); }
.last-build .did p { margin: 0 0 .5rem; }
.checks { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 13px; font-weight: 700; }
.checks li { display: flex; align-items: center; gap: 6px; }
.checks li.pass { color: var(--green); }
.checks li.fail { color: var(--red); }
.card.sub { padding: 16px 18px; border-color: var(--accent-line); background: #fbfcff; }
.review-head { display: flex; align-items: center; gap: 10px; margin: 0 0 .5rem; }
.badge { margin-left: auto; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; background: var(--amber-soft); color: var(--amber); }
.badge.ok { background: var(--green-soft); color: var(--green); }
.review-line { margin: .35rem 0; color: var(--body); }
.review-line strong { color: var(--ink); }
#review ul { margin: .2rem 0 .6rem; padding-left: 1.2rem; color: var(--body); }
.progress { padding: 12px 16px; border-radius: 10px; background: var(--accent-soft); }
#tool-log { margin: .4rem 0 0; padding-left: 1.2rem; color: var(--muted); }
.leads { display: flex; flex-direction: column; gap: 8px; margin: 0 0 1rem; }
.lead { padding: 10px 14px; border-radius: 10px; background: var(--amber-soft); font-size: 14px; }
.lead.ok { background: var(--green-soft); }

/* Stage 5 */
.live-banner { display: flex; align-items: center; gap: 16px; padding: 16px 20px; border-radius: 12px; border: 1px solid #b7dcc6; background: #f2faf5; flex-wrap: wrap; }
.live-mark { width: 36px; height: 36px; border-radius: 999px; background: var(--green); flex-shrink: 0; }
.live-title { font-size: 17px; font-weight: 800; }
.live-url { font-family: ui-monospace, Consolas, monospace; font-size: 14px; }
.live-banner .actions { margin-left: auto; }
.take { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 14px 0 0; flex-wrap: wrap; }

/* Rail: the phone */
.rail { display: flex; flex-direction: column; gap: 10px; position: sticky; top: 16px; }
.rail-head { display: flex; align-items: center; justify-content: space-between; }
.rail-head .label { margin: 0; display: flex; align-items: center; gap: 8px; }
.live-dot { width: 8px; height: 8px; border-radius: 999px; background: var(--green); display: inline-block; }
.rail-actions { display: flex; gap: 4px; }
.phone { width: 300px; height: 560px; border-radius: 28px; border: 2px solid var(--line-strong); background: #fff; overflow: hidden; display: grid; place-items: center; padding: 0; }
.phone.on { border-color: var(--ink); box-shadow: 0 16px 36px rgba(31,36,48,.14); }
.phone iframe { width: 100%; height: 100%; border: 0; display: block; }
.phone p { padding: 24px; margin: 0; }
.rail-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.body.stage-5 .phone { display: none; }
.body.stage-5 .rail-head, .body.stage-5 .rail-foot .mono { display: none; }
.body.stage-5 .rail { position: static; gap: 14px; }
.body.stage-5 .rail-foot { justify-content: flex-end; }
#publish-view { display: flex; flex-direction: column; gap: 14px; }
.browser { overflow: hidden; }
.browser-bar { display: flex; align-items: center; gap: 6px; padding: 8px 12px; border-bottom: 1px solid var(--line); background: #fafbfc; }
.dot3 { width: 10px; height: 10px; border-radius: 999px; background: var(--line); }
.browser-bar .mono { flex: 1; margin-left: 8px; height: 24px; border-radius: 6px; background: #fff; border: 1px solid var(--line); color: var(--muted); display: flex; align-items: center; padding: 0 10px; }
.browser-frame { height: 66vh; min-height: 480px; display: flex; justify-content: center; background: #fff; }
.browser-frame iframe { width: 100%; height: 100%; border: 0; }
.browser-frame.phone-width iframe { width: 390px; border-left: 1px solid var(--line); border-right: 1px solid var(--line); }

/* Start over */
.confirm { padding: 12px; border: 1px solid var(--red); border-radius: 10px; background: #fff7f7; font-size: 14px; }
.confirm p { margin: 0 0 .5rem; }
.confirm .check { display: flex; gap: .5rem; align-items: center; font-weight: 500; margin: .5rem 0; font-size: 13px; }
.confirm .check input { width: auto; margin: 0; }

/* Full-size overlay */
.overlay { position: fixed; inset: 0; background: rgba(31,36,48,.55); z-index: 50; display: flex; flex-direction: column; padding: 24px; }
.overlay-bar { display: flex; align-items: center; gap: 16px; background: #fff; border-radius: 12px 12px 0 0; padding: 10px 14px; }
.overlay-bar .mono { flex: 1; color: var(--muted); }
.seg { display: flex; gap: 2px; padding: 2px; border-radius: 8px; background: var(--bg); }
.seg button { height: 28px; padding: 0 10px; font-size: 12px; border-radius: 6px; color: var(--muted); }
.seg .seg-on { background: #fff; color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,.06); }
.overlay-frame { flex: 1; background: #fff; border-radius: 0 0 12px 12px; overflow: hidden; display: flex; justify-content: center; }
.overlay-frame iframe { width: 100%; height: 100%; border: 0; }
.overlay-frame.phone-width iframe { width: 390px; border-left: 1px solid var(--line); border-right: 1px solid var(--line); }

/* Instructor page */
.shell { max-width: 1000px; margin: 6vh auto; padding: 0 1.25rem; }
h1 { font-size: 1.6rem; margin: 0 0 1rem; }
table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
th, td { text-align: left; padding: .6rem .75rem; border-bottom: 1px solid var(--line); }
tbody tr:last-child td { border-bottom: 0; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* Phones: the header becomes two rows (brand + meter, then a scrollable stage strip); the
   work column goes edge to edge; tiles and buttons stack. 16px inputs stop iOS auto-zoom. */
@media (max-width: 720px) {
  .top { height: auto; flex-wrap: wrap; padding: 10px 14px 0; gap: 6px 10px; }
  .brand { font-size: 15px; }
  .meter { margin-left: auto; font-size: 12px; gap: 4px; }
  .meter .tiny { height: 24px; padding: 0 4px; }
  .stages { order: 3; flex: 0 0 auto; width: calc(100% + 28px); gap: 0; overflow-x: auto; scrollbar-width: none; margin: 4px -14px 0; padding: 0 14px; }
  .top { overflow: hidden; }
  body { overflow-x: hidden; }
  .stages::-webkit-scrollbar { display: none; }
  .stage-link { height: 40px; padding: 0 10px; font-size: 12px; }
  .body, .body.stage-5 { padding: 12px 10px 24px; gap: 16px; }
  .stage-row { padding: 12px 14px; gap: 10px; justify-content: flex-start; }
  .stage.open .stage-row { padding: 18px 16px 6px; }
  .stage.open .stage-title { font-size: 19px; }
  .stage-body { padding: 4px 16px 18px; }
  .stage-summary { display: none; }
  .habits { grid-template-columns: 1fr; }
  input, textarea { font-size: 16px; }
  .row { flex-direction: column; align-items: stretch; }
  .row.end { align-items: stretch; }
  .actions { flex-direction: column; align-items: stretch; }
  .primary, .secondary { width: 100%; }
  .slots { justify-content: center; }
  .rail { position: static; align-items: center; }
  .phone { width: 100%; max-width: 360px; height: 520px; }
  .rail-head, .rail-foot { width: 100%; max-width: 360px; }
  .live-banner .actions { margin-left: 0; width: 100%; }
  .browser-frame { height: 60vh; min-height: 380px; }
  .browser-bar .mono { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .overlay { padding: 8px; }
  .overlay-frame.phone-width iframe, .browser-frame.phone-width iframe { width: 100%; border: 0; }
}

/* Promo video on the login card. */
.promo { display: block; width: 100%; aspect-ratio: 16 / 9; border-radius: 10px; background: #000; margin: 0 0 1.1rem; }