/* ASL Masters: a playful "learning game" look.
   Change the palette or fonts here; everything else uses these variables. */
:root {
  /* Palette: https://coolors.co/palette/05668d-427aa1-ebf2fa-679436-a5be00 */
  --page: #EBF2FA;       /* page background */
  --surface: #FFFFFF;    /* panels and cards */
  --primary: #05668D;    /* top bar, tags */
  --secondary: #427AA1;  /* borders, camera area */
  --accent: #679436;     /* main buttons, the word */
  --highlight: #A5BE00;  /* step numbers, icon fills, small highlights */

  /* Worked out from the palette so text stays readable if the colours change. */
  --text: color-mix(in srgb, var(--primary) 40%, black);
  --muted: color-mix(in srgb, var(--secondary) 60%, black);
  --accent-dark: color-mix(in srgb, var(--accent) 65%, black);
  --on-accent: #FFFFFF;

  --font-display: "Fredoka", "Nunito", system-ui, sans-serif;
  --font-body: "Nunito", system-ui, sans-serif;

  --radius: 24px;
  --border: 4px solid var(--secondary);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page);
  color: var(--text);
  font-family: var(--font-body);
  display: flex;
  flex-direction: column;
}

button { font: inherit; cursor: pointer; }
button:disabled { cursor: default; opacity: 0.55; }
:focus-visible { outline: 3px solid var(--highlight); outline-offset: 3px; }

/* Icons: Phosphor duotone. The faded layer takes --icon-tone. */
.icon { width: 1.25em; height: 1.25em; flex-shrink: 0; fill: currentColor; --icon-tone: var(--highlight); }
svg.icon { overflow: visible; }

.muted { color: var(--muted); }
.strong { font-weight: 800; }
.eyebrow { margin: 0; font-weight: 800; font-size: 14px; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); }
.accent-text { color: var(--accent); }

/* ---------- Top bar ---------- */
.topbar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px max(16px, 32px);
  background: var(--primary); color: #FFFFFF;
  border-bottom: var(--border);
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-tile {
  width: 48px; height: 48px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent); color: var(--on-accent); box-shadow: 0 4px 0 var(--accent-dark);
}
.logo-tile .icon { width: 32px; height: 32px; }
.logo-text { font-family: var(--font-display); font-weight: 700; font-size: 28px; letter-spacing: 1px; }
.logo-asl { color: var(--highlight); }
.stats { display: flex; flex-wrap: wrap; gap: 12px; }
.stat-chip {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 999px;
  background: var(--page); color: var(--text); border: 3px solid var(--secondary);
  font-weight: 800;
}
.icon-star { color: var(--highlight); }
.learned-squares { display: flex; gap: 4px; }
.learned-squares span { width: 14px; height: 14px; border-radius: 4px; background: var(--secondary); opacity: 0.35; }
.learned-squares span.on { background: var(--highlight); opacity: 1; }
.learned-count { color: var(--primary); }

main {
  flex-grow: 1; width: 100%; max-width: 1400px; margin: 0 auto;
  padding: 20px max(16px, 32px) 28px;
}

/* ---------- Shared pieces ---------- */
.panel {
  display: flex; flex-direction: column; gap: 12px; min-width: 0;
  padding: 16px; border-radius: var(--radius);
  background: var(--surface); border: var(--border);
}
.panel-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; }
.panel-title {
  margin: 0; display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: 26px;
}
.panel-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.step-number {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--highlight); color: var(--text);
  font-family: var(--font-display); font-weight: 700; font-size: 20px;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 44px; padding: 8px 20px; border-radius: 14px;
  font-weight: 800; font-size: 17px;
  transition: transform 0.08s, box-shadow 0.08s;
}
.btn:active:not(:disabled) { transform: translateY(4px); }
.btn-primary {
  border: 0; background: var(--accent); color: var(--on-accent);
  box-shadow: 0 6px 0 var(--accent-dark);
  font-family: var(--font-display); font-weight: 700; letter-spacing: 1px;
}
.btn-primary:active:not(:disabled) { box-shadow: 0 2px 0 var(--accent-dark); }
.btn-big { min-height: 56px; padding: 10px 32px; font-size: 24px; border-radius: 16px; }
.btn-quiet {
  border: 3px solid var(--secondary); background: var(--page); color: var(--text);
  box-shadow: 0 4px 0 var(--secondary);
}
.btn-quiet:active:not(:disabled) { box-shadow: 0 0 0 var(--secondary); }

.bar { height: 14px; border-radius: 999px; background: var(--page); border: 3px solid var(--secondary); overflow: hidden; }
.bar-fill { height: 100%; width: 0; border-radius: 999px; background: var(--accent); }

.privacy { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--muted); }

/* ---------- Welcome ---------- */
.welcome { display: flex; flex-wrap: wrap; align-items: center; gap: 48px; padding: 36px 0; }
.welcome-intro { flex: 1 1 460px; min-width: 0; display: flex; flex-direction: column; gap: 22px; }
.welcome-title {
  margin: 0; font-family: var(--font-display); font-weight: 700;
  font-size: clamp(40px, 6vw, 64px); line-height: 1.05; text-wrap: balance;
}
.welcome-lede { margin: 0; font-size: 20px; line-height: 1.5; max-width: 34em; color: var(--muted); }
.loading { display: flex; flex-direction: column; gap: 8px; max-width: 460px; }
.loading-label { display: flex; justify-content: space-between; font-weight: 800; color: var(--muted); }
.loading-percent { color: var(--accent); }
.loading .bar-fill { transition: width 0.4s; }
.welcome-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.error-box {
  margin: 0; padding: 12px 16px; border-radius: 14px;
  background: var(--surface); border: 3px solid var(--primary); font-weight: 800;
}
.how-it-works { flex: 1 1 380px; gap: 16px; padding: 24px; box-shadow: 0 10px 0 var(--secondary); }
.steps { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; }
.steps li {
  display: flex; align-items: center; gap: 16px; padding: 14px 18px;
  border-radius: 18px; background: var(--page); border: 3px solid var(--secondary);
}
.steps .step-number { width: 44px; height: 44px; font-size: 24px; }
.steps div { display: flex; flex-direction: column; gap: 2px; }
.steps strong { font-family: var(--font-display); font-weight: 600; font-size: 22px; }
.steps span { font-weight: 700; color: var(--muted); }

/* ---------- Practice ---------- */
.practice { display: flex; flex-direction: column; gap: 20px; }
.word-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.word-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 6px; min-width: 240px;
  padding: 10px 26px 14px 18px; border-radius: 20px;
  background: var(--surface); border: var(--border); box-shadow: 0 5px 0 var(--secondary);
}
.word-card-top { display: flex; align-items: center; gap: 12px; }
.tag { padding: 4px 12px; border-radius: 10px; background: var(--primary); color: #FFFFFF; font-weight: 800; font-size: 13px; letter-spacing: 2px; }
.word {
  font-family: var(--font-display); font-weight: 700; font-size: 48px; line-height: 1;
  color: var(--accent); text-transform: uppercase; text-shadow: 0 3px 0 var(--page);
}
.difficulty { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.difficulty .eyebrow { margin-right: 4px; }
@media (max-width: 520px) { .difficulty .eyebrow { width: 100%; } }
.pill {
  min-height: 44px; padding: 8px 18px; border-radius: 12px;
  font-weight: 800; font-size: 16px;
  border: 3px solid var(--secondary); background: var(--surface); color: var(--text);
}
.pill[aria-pressed="true"] { border-color: var(--accent); background: var(--accent); color: var(--on-accent); box-shadow: 0 4px 0 var(--accent-dark); }

.panels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 860px) { .panels { grid-template-columns: minmax(0, 1fr); } }

.media { position: relative; aspect-ratio: 4 / 3; border-radius: 16px; overflow: hidden; }
.demo-box { background: var(--page); }
.demo-box video, .demo-box canvas { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
#demo { --demo-body: var(--secondary); --demo-hand: var(--accent); }

.camera-box { background: var(--secondary); }
/* A thick border over the video while recording. */
.camera-box.recording::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  border: 8px solid var(--accent); pointer-events: none;
}
/* The camera is mirrored so it feels like a mirror; tracked points are drawn on top. */
.camera-box video, .camera-box canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transform: scaleX(-1);
}
/* Dim the camera during "get ready", back to normal for "sign now".
   Only the picture on screen is dimmed; the hand tracking still sees the full image. */
.camera-box video { transition: filter 0.5s ease; }
.camera-box.counting video { filter: brightness(0.4); }

/* Frosted see-through boxes over the camera. */
.frosted {
  background: color-mix(in srgb, var(--page) 70%, transparent);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
#overlay { --track-hand: var(--highlight); --track-recording: var(--accent); --track-body: var(--surface); }
.frame-guide {
  position: absolute; inset: 0; padding-top: 12%;
  display: flex; flex-direction: column; align-items: center; justify-content: flex-end;
  pointer-events: none; opacity: 0.55;
}
.guide-head { width: 24%; aspect-ratio: 1; border-radius: 50%; border: 2px dashed var(--highlight); }
.guide-shoulders { width: 70%; height: 38%; margin-top: 6px; border: 2px dashed var(--highlight); border-bottom: 0; border-radius: 120px 120px 0 0; }
.camera-box.recording .frame-guide, .camera-box.recording .camera-label { display: none; }
.camera-label {
  position: absolute; left: 12px; top: 12px; padding: 4px 10px; border-radius: 8px;
  background: var(--page); color: var(--muted); font-weight: 700; font-size: 13px;
}

.hand-chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px;
  background: var(--page); font-weight: 800; font-size: 14px; color: var(--muted);
}
.hand-chip[data-on="true"] { color: var(--accent); }

.countdown {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  pointer-events: none;
}
.count-number {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(100px, 14vw, 180px); line-height: 1;
  color: var(--accent); text-shadow: 0 8px 0 var(--accent-dark);
}
.count-label {
  font-family: var(--font-display); font-weight: 600; font-size: 28px;
  padding: 6px 18px; border-radius: 12px; color: var(--accent-dark);
}
.countdown.signing { justify-content: flex-start; padding-top: 16px; }
.countdown.signing .count-number { display: none; }

.phase {
  position: absolute; left: 12px; right: 12px; bottom: 12px;
  display: flex; flex-direction: column; gap: 6px;
  padding: 8px 12px; border-radius: 12px;
}
.phase-labels { display: flex; justify-content: space-between; font-weight: 800; font-size: 13px; letter-spacing: 2px; color: var(--accent-dark); }
.phase .bar { background: transparent; }

.result {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  padding: 24px; text-align: center;
  background: var(--page); box-shadow: inset 0 0 0 6px var(--secondary);
  overflow-y: auto;
}
.result[data-kind="pass"] { box-shadow: inset 0 0 0 6px var(--accent); }
.result-icon { width: clamp(72px, 9vw, 120px); height: clamp(72px, 9vw, 120px); color: var(--accent); }
.result-title {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(36px, 4.5vw, 52px); line-height: 1;
  text-shadow: 0 4px 0 var(--surface);
}
.result[data-kind="pass"] .result-title { color: var(--accent); }
.result-message { font-weight: 800; font-size: 20px; }
.result-message em { font-style: normal; color: var(--accent); }
.result-tip { font-weight: 700; max-width: 420px; }
.result-details { width: 100%; max-width: 440px; font-weight: 700; color: var(--muted); }
.result-details summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; justify-content: center; }
.result-details pre {
  margin: 6px 0 0; padding: 10px 14px; border-radius: 12px; background: var(--surface);
  font-family: var(--font-body); font-size: 14px; line-height: 1.6; text-align: left; white-space: pre-wrap;
}

.practice-footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }

.debug-tools {
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px;
  padding: 12px 16px; border-radius: 14px; border: 3px dashed var(--secondary); font-weight: 700;
}
.debug-tools input[type="number"] { width: 70px; font: inherit; }