/* ── handTalk Learn — learn.css ─────────────────────────────────────────────
   Imports handTalk's design tokens. All colours reference CSS variables
   already defined in style.css so the two pages stay visually identical.
   ─────────────────────────────────────────────────────────────────────────── */

/* ── Design tokens (mirror of style.css — self-contained if style.css absent) */
:root {
  --accent:      #29c49a;
  --accent-2:    #4dd9b4;
  --accent-dim:  rgba(41,196,154,.15);
  --accent-glow: rgba(41,196,154,.35);
  --bg:          #0a0a0f;
  --surface:     #111118;
  --surface-2:   #1a1a24;
  --border:      rgba(255,255,255,.07);
  --border-acc:  rgba(41,196,154,.25);
  --text:        #e8e8ec;
  --text-dim:    #7a7a8e;
  --text-faint:  #3a3a4e;
  --danger:      #e05a5a;
  --warn:        #e0a05a;
  --radius:      10px;
  --radius-lg:   16px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', 'Sora', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Scrollbar ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-faint); border-radius: 3px; }

/* ── Top Nav ─────────────────────────────────────────────────────────────── */
.ht-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: 52px;
  display: flex; align-items: center; gap: 4px;
  padding: 0 20px;
  background: rgba(10,10,15,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.ht-logo {
  font-size: 17px; font-weight: 700; letter-spacing: -.3px;
  color: var(--text); text-decoration: none;
  display: flex; align-items: center; gap: 7px;
  margin-right: auto;
}
.ht-logo span { color: var(--accent); }
.nav-link {
  padding: 6px 14px; border-radius: 7px;
  font-size: 13px; font-weight: 500; letter-spacing: .01em;
  color: var(--text-dim); text-decoration: none;
  transition: color .15s, background .15s;
}
.nav-link:hover { color: var(--text); background: rgba(255,255,255,.05); }
.nav-link.active { color: var(--accent); background: var(--accent-dim); }

/* ── Page shell ──────────────────────────────────────────────────────────── */
.learn-page {
  padding-top: 52px;
  min-height: 100vh;
  display: flex; flex-direction: column;
}

/* ── Mode tabs ───────────────────────────────────────────────────────────── */
.mode-tabs {
  display: flex; align-items: center; gap: 2px;
  padding: 14px 24px 0;
  border-bottom: 1px solid var(--border);
}
.mode-tab {
  padding: 9px 20px 11px;
  font-size: 13px; font-weight: 600; letter-spacing: .03em;
  color: var(--text-dim); cursor: pointer;
  border: none; background: none;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
  text-transform: uppercase;
}
.mode-tab:hover  { color: var(--text); }
.mode-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Mode panels ─────────────────────────────────────────────────────────── */
.mode-panel {
  display: none; flex: 1;
  animation: fadeUp .18s ease;
}
.mode-panel.active { display: flex; flex-direction: column; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0);   }
}

/* ── LIBRARY ─────────────────────────────────────────────────────────────── */
.lib-toolbar {
  display: flex; align-items: center; gap: 10px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.lib-search-wrap {
  flex: 1; min-width: 180px; position: relative;
}
.lib-search-wrap svg {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  color: var(--text-dim); pointer-events: none;
}
.lib-search {
  width: 100%; padding: 8px 12px 8px 34px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text); font-size: 13px;
  outline: none; transition: border-color .15s;
}
.lib-search:focus { border-color: var(--border-acc); }
.lib-search::placeholder { color: var(--text-faint); }

.cat-select {
  padding: 8px 12px; border-radius: var(--radius);
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text); font-size: 13px; cursor: pointer; outline: none;
}
.lib-stats {
  font-size: 12px; color: var(--text-dim); white-space: nowrap;
}

.sign-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
  padding: 16px 24px;
  overflow-y: auto;
}

.sign-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 10px 10px;
  cursor: pointer; position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: border-color .15s, transform .15s, box-shadow .15s;
  user-select: none;
}
.sign-card:hover {
  border-color: var(--border-acc);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.3);
}
.sign-card-thumb {
  width: 48px; height: 48px;
  background: var(--accent-dim);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: -.5px;
}
.sign-card-name {
  font-size: 12px; font-weight: 600; text-align: center;
  color: var(--text); text-transform: uppercase; letter-spacing: .06em;
  line-height: 1.2;
}
.sign-card-badge {
  position: absolute; top: 7px; right: 7px;
  width: 18px; height: 18px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700;
}
.sign-card.mastered .sign-card-badge  { background: var(--accent);  color: #000; }
.sign-card.mastered .sign-card-badge::after { content: '✓'; }
.sign-card.weak     .sign-card-badge  { background: var(--warn);    color: #000; }
.sign-card.weak     .sign-card-badge::after { content: '!'; }
.sign-card.mastered { border-color: rgba(41,196,154,.2); }

.empty-state {
  display: flex; flex-direction: column; align-items: center;
  gap: 12px; padding: 60px 24px; color: var(--text-dim);
  text-align: center;
}
.empty-state svg { color: var(--text-faint); }

/* ── Sign modal ──────────────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0,0,0,.75);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn .15s ease;
}
.modal-backdrop.hidden { display: none; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.sign-modal {
  background: var(--surface);
  border: 1px solid var(--border-acc);
  border-radius: var(--radius-lg);
  width: 100%; max-width: 520px;
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,.6);
  animation: scaleIn .18s ease;
}
@keyframes scaleIn {
  from { transform: scale(.95); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-sign-name {
  font-size: 22px; font-weight: 700; letter-spacing: -.4px;
  color: var(--accent);
}
.modal-close {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-2); border: none; color: var(--text-dim);
  cursor: pointer; font-size: 16px; transition: background .15s;
}
.modal-close:hover { background: var(--border); color: var(--text); }

.modal-video {
  position: relative; width: 100%; padding-top: 56.25%;
  background: #000;
}
/* Slot must fill the padding-box so the blockquote/widget has a sized container */
#modalVideoSlot {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  overflow: hidden;
}
#modalVideoSlot .signasldata-embed,
#modalVideoSlot blockquote {
  margin: 0; padding: 0;
  width: 100% !important;
  height: 100% !important;
  border: none;
}
.modal-video iframe {
  position: absolute; inset: 0; width: 100%; height: 100%;
  border: none;
}
.modal-no-video {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 8px;
  color: var(--text-dim); font-size: 13px;
}

.modal-foot {
  padding: 14px 20px;
  display: flex; align-items: center; gap: 10px;
}
.btn-primary {
  flex: 1; padding: 10px 16px;
  background: var(--accent); color: #000;
  font-size: 13px; font-weight: 700; letter-spacing: .04em;
  border: none; border-radius: var(--radius); cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.btn-primary:hover { opacity: .9; transform: translateY(-1px); }
.btn-secondary {
  padding: 10px 16px;
  background: var(--surface-2); color: var(--text-dim);
  font-size: 13px; font-weight: 600;
  border: 1px solid var(--border); border-radius: var(--radius);
  cursor: pointer; transition: color .15s, border-color .15s;
}
.btn-secondary:hover { color: var(--text); border-color: var(--border-acc); }

/* ── PRACTICE ────────────────────────────────────────────────────────────── */
.practice-shell {
  display: flex; flex-direction: column; flex: 1;
}

/* Sign picker (before session starts) */
.sign-picker {
  flex: 1; display: flex; flex-direction: column;
}
.sign-picker-head {
  padding: 20px 24px 10px;
  display: flex; align-items: center; justify-content: space-between;
}
.sign-picker-head h2 { font-size: 18px; font-weight: 700; }
.sign-picker-head p  { font-size: 13px; color: var(--text-dim); }
.picker-actions {
  display: flex; gap: 8px; padding: 0 24px 16px;
  border-bottom: 1px solid var(--border);
}

/* Active practice session */
.practice-session {
  flex: 1; display: none; flex-direction: column;
}
.practice-session.active { display: flex; }

.session-header {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
}
.session-back {
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; font-size: 13px; display: flex; align-items: center; gap: 5px;
  transition: color .15s; padding: 4px 0;
}
.session-back:hover { color: var(--text); }
.session-target-label {
  flex: 1; text-align: center;
  font-size: 14px; color: var(--text-dim);
}
.session-target-word {
  font-size: 22px; font-weight: 800; letter-spacing: -.5px;
  color: var(--accent);
}
.session-progress {
  font-size: 13px; color: var(--text-dim);
  background: var(--surface-2); padding: 4px 10px; border-radius: 20px;
}

.practice-arena {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px; padding: 16px 20px; flex: 1;
  align-items: start;
}
.arena-video, .arena-camera {
  position: relative; border-radius: var(--radius-lg);
  overflow: hidden; background: #000;
  border: 1px solid var(--border);
}
.arena-label {
  position: absolute; top: 10px; left: 10px; z-index: 10;
  font-size: 11px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text-dim);
  background: rgba(0,0,0,.6); padding: 3px 8px; border-radius: 4px;
}
.arena-video-ratio { padding-top: 75%; }
.arena-camera-ratio { padding-top: 75%; }
.arena-video iframe {
  position: absolute; inset: 0; width: 100%; height: 100%; border: none;
}
.arena-camera video,
.arena-camera canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
.arena-camera canvas { z-index: 2; }

/* Progress ring overlay on camera */
.progress-ring-wrap {
  position: absolute; inset: 0; z-index: 3;
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
}
.progress-ring-svg { width: 80px; height: 80px; }
.ring-bg   { fill: none; stroke: rgba(255,255,255,.08); stroke-width: 4; }
.ring-fill {
  fill: none; stroke: var(--accent); stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 220;
  stroke-dashoffset: 220;
  transform: rotate(-90deg); transform-origin: center;
  transition: stroke-dashoffset .12s linear, stroke .15s;
}
.ring-fill.wrong  { stroke: var(--warn); }
.ring-fill.danger { stroke: var(--danger); }
.ring-fill.done   { stroke: var(--accent); filter: drop-shadow(0 0 6px var(--accent-glow)); }

.cam-status {
  position: absolute; bottom: 10px; left: 0; right: 0;
  text-align: center; z-index: 4;
  font-size: 12px; font-weight: 600; color: var(--text-dim);
  text-shadow: 0 1px 4px rgba(0,0,0,.8);
}

.practice-footer {
  padding: 10px 20px 16px;
  display: flex; flex-direction: column; gap: 8px;
}
.conf-row {
  display: flex; align-items: center; gap: 10px; font-size: 12px;
}
.conf-label { color: var(--text-dim); min-width: 80px; }
.conf-bar {
  flex: 1; height: 5px; background: var(--surface-2);
  border-radius: 3px; overflow: hidden;
}
.conf-bar-fill {
  height: 100%; background: var(--accent);
  border-radius: 3px; transition: width .1s linear;
  width: 0%;
}
.conf-bar-fill.wrong { background: var(--warn); }
.conf-val { min-width: 36px; color: var(--text-dim); text-align: right; }

.practice-actions {
  display: flex; gap: 8px;
}

/* Session complete overlay */
.session-complete {
  position: absolute; inset: 0; z-index: 50;
  background: rgba(10,10,15,.96);
  display: none; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 16px; padding: 24px; text-align: center;
  animation: fadeIn .25s ease;
}
.session-complete.active { display: flex; }
.complete-icon { font-size: 48px; }
.complete-title { font-size: 26px; font-weight: 800; }
.complete-results {
  display: flex; flex-direction: column; gap: 4px;
  width: 100%; max-width: 320px;
}
.result-row {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; padding: 5px 12px;
  background: var(--surface); border-radius: 8px;
}
.result-row.pass { border-left: 3px solid var(--accent); }
.result-row.fail { border-left: 3px solid var(--danger); }
.result-icon { font-size: 12px; }
.result-sign { flex: 1; font-weight: 600; text-align: left; }
.result-time { color: var(--text-dim); font-size: 11px; }
.complete-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

/* ── QUIZ ────────────────────────────────────────────────────────────────── */
.quiz-shell { flex: 1; display: flex; flex-direction: column; }

.quiz-start {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 20px; padding: 32px;
  text-align: center;
}
.quiz-start h2 { font-size: 26px; font-weight: 800; }
.quiz-start p  { color: var(--text-dim); max-width: 320px; font-size: 14px; }
.quiz-options  { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.quiz-opt {
  padding: 10px 20px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer;
  font-size: 13px; font-weight: 600; color: var(--text-dim);
  transition: border-color .15s, color .15s;
}
.quiz-opt:hover,
.quiz-opt.selected { border-color: var(--accent); color: var(--accent); }

.quiz-active {
  flex: 1; display: none; flex-direction: column;
}
.quiz-active.running { display: flex; }

.quiz-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px 10px;
}
.quiz-progress-text { font-size: 13px; color: var(--text-dim); }
.quiz-timer-display {
  font-size: 28px; font-weight: 900; letter-spacing: -1px;
  color: var(--accent); font-variant-numeric: tabular-nums;
  transition: color .3s;
}
.quiz-timer-display.urgent { color: var(--danger); }

.timer-bar {
  height: 3px; background: var(--surface-2); margin: 0 24px;
}
.timer-bar-fill {
  height: 100%; background: var(--accent);
  border-radius: 2px; transition: width 1s linear;
}
.timer-bar-fill.urgent { background: var(--danger); }

.quiz-arena {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px; padding: 16px 20px; flex: 1;
  align-items: start;
}

.quiz-prompt {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 8px; padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  aspect-ratio: 1 / 1;
}
.quiz-prompt-label { font-size: 13px; color: var(--text-dim); letter-spacing: .08em; text-transform: uppercase; }
.quiz-target-word  { font-size: 56px; font-weight: 900; letter-spacing: -2px; color: var(--text); }

.quiz-camera-wrap {
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--border); background: #000;
  position: relative;
}
.quiz-camera-ratio { padding-top: 100%; }
.quiz-camera-wrap video,
.quiz-camera-wrap canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
.quiz-camera-wrap canvas { z-index: 2; }

.quiz-feedback {
  padding: 10px 24px 16px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px;
}
.quiz-model-sees { color: var(--text-dim); }
.quiz-model-sees strong { color: var(--text); }
.quiz-skip {
  background: none; border: 1px solid var(--border);
  color: var(--text-dim); font-size: 12px; font-weight: 600;
  padding: 6px 14px; border-radius: var(--radius); cursor: pointer;
  transition: border-color .15s, color .15s;
}
.quiz-skip:hover { border-color: var(--border-acc); color: var(--text); }

/* Quiz results */
.quiz-results {
  flex: 1; display: none; flex-direction: column;
  align-items: center; padding: 24px; gap: 20px;
  overflow-y: auto;
}
.quiz-results.visible { display: flex; }
.quiz-score-ring {
  width: 100px; height: 100px; position: relative;
}
.quiz-score-ring svg { width: 100%; height: 100%; }
.score-ring-bg   { fill: none; stroke: var(--surface-2); stroke-width: 8; }
.score-ring-fill {
  fill: none; stroke: var(--accent); stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transform: rotate(-90deg); transform-origin: center;
  transition: stroke-dashoffset 1s ease;
}
.quiz-score-text {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  font-weight: 800;
}
.score-num  { font-size: 24px; line-height: 1; }
.score-den  { font-size: 11px; color: var(--text-dim); }
.results-table {
  width: 100%; max-width: 480px;
  display: flex; flex-direction: column; gap: 4px;
}
.results-row {
  display: grid; grid-template-columns: 24px 1fr 90px 80px;
  align-items: center; gap: 8px;
  padding: 7px 12px; background: var(--surface); border-radius: 8px;
  font-size: 13px;
}
.results-row.pass { border-left: 3px solid var(--accent); }
.results-row.fail { border-left: 3px solid var(--danger); }
.results-sign  { font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.results-time  { color: var(--text-dim); font-size: 11px; text-align: right; }
.results-label {
  font-size: 11px; font-weight: 700; text-align: right;
  color: var(--text-faint);
}
.results-row.pass .results-label { color: var(--accent); }
.results-row.fail .results-label { color: var(--danger); }
.quiz-meta {
  display: flex; gap: 24px;
  font-size: 13px; color: var(--text-dim);
}
.quiz-meta strong { color: var(--text); }
.results-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

/* ── TOAST ───────────────────────────────────────────────────────────────── */
#lrn-toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(12px);
  background: var(--surface-2); border: 1px solid var(--border-acc);
  color: var(--text); font-size: 13px; font-weight: 500;
  padding: 9px 18px; border-radius: 20px;
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
  opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 1000; white-space: nowrap;
}
#lrn-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#lrn-toast.success { border-color: var(--accent); color: var(--accent); }
#lrn-toast.danger  { border-color: var(--danger); color: var(--danger); }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  .practice-arena, .quiz-arena { grid-template-columns: 1fr; }
  .sign-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 8px; }
  .mode-tab  { padding: 8px 14px 10px; font-size: 12px; }
  .quiz-target-word { font-size: 40px; }
  .quiz-prompt { aspect-ratio: auto; padding: 16px; }
}

/* ── Camera off placeholder ──────────────────────────────────────────────── */
.cam-placeholder {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 8px;
  color: var(--text-dim); font-size: 13px; background: var(--surface);
}
.cam-placeholder svg { color: var(--text-faint); }

/* ── Inline progress bar (session) ──────────────────────────────────────── */
.session-prog-bar {
  height: 2px; background: var(--surface-2);
  margin: 0 20px;
}
.session-prog-fill {
  height: 100%; background: var(--accent);
  border-radius: 1px; transition: width .4s ease;
}

.sign-grid, .practice-arena {
  will-change: transform;
  -webkit-overflow-scrolling: touch;
}

.arena-video iframe,
#modalVideoSlot iframe {
  pointer-events: auto;
}

/* Quiz improvements - small & clean */
.quiz-target-word {
  font-size: clamp(2.8rem, 8vw, 4.2rem) !important;
  line-height: 1.1;
}


.timer-bar-fill {
  transition: width .8s linear; /* smoother timer */
}

/* Mobile performance — disable GPU-heavy effects */
@media (max-width: 768px) {
  .mode-bar,
  .sign-modal-inner {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }
}