:root {
  /* Salvation Army palette */
  --bg: #0a0d1a;
  --bg2: #0d1220;
  --stage: #111828;
  --navy: #003087;
  --navy2: #00205c;
  --navy3: #1a3a7a;
  --red: #CC0000;
  --red2: #a80000;
  --red3: #e60000;
  --gold: #FFD700;
  --gold2: #FFC200;
  --gold3: #ffe066;
  --paper: #f0f4ff;
  --paper2: #e8eeff;
  --ink: #0a0d1a;
  --muted: #7a8ab0;
  --green: #0f7a68;
  --line: #1e2a4a;
  --shadow: rgba(0,0,0,.55);
  --border: rgba(255,215,0,.18);
}

* { box-sizing: border-box; }
html { min-height: 100%; }

body {
  margin: 0;
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--paper);
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 8%, rgba(0,48,135,.45), transparent 35%),
    radial-gradient(circle at 85% 18%, rgba(204,0,0,.25), transparent 30%),
    radial-gradient(circle at 50% 90%, rgba(0,32,92,.3), transparent 40%),
    linear-gradient(160deg, #04060e 0%, #080d1c 50%, #04060e 100%);
}

/* Subtle grid overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255,215,0,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,215,0,.02) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: .6;
}

.app-shell {
  width: min(1080px, 94vw);
  margin: 0 auto;
  padding: 22px 0 48px;
  position: relative;
}

/* ── HERO ── */
.hero {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 22px 26px;
  background: linear-gradient(135deg, rgba(0,32,92,.97) 0%, rgba(0,48,135,.93) 60%, rgba(0,28,80,.98) 100%);
  border: 2px solid rgba(255,215,0,.35);
  box-shadow: 0 20px 50px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,215,0,.15);
  margin-bottom: 18px;
  border-radius: 18px;
  overflow: hidden;
  position: relative;
}

/* SA shield watermark */
.hero::after {
  content: '🛡';
  position: absolute;
  right: 130px;
  bottom: -18px;
  font-size: 88px;
  opacity: .06;
  transform: rotate(-5deg);
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: 11px;
  color: var(--gold2);
  font-family: 'Courier New', monospace;
}

h1 {
  margin: 0;
  font-size: clamp(38px, 7vw, 72px);
  line-height: .92;
  font-style: italic;
  letter-spacing: -.03em;
  color: #fff;
  text-shadow: 0 2px 0 rgba(0,0,0,.4), 0 0 30px rgba(255,215,0,.15);
}

.subtitle {
  margin: 10px 0 0;
  font-size: 17px;
  color: rgba(220,228,255,.8);
}

/* ── VI TOGGLE BUTTON ── */
.vi-toggle-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
  flex-shrink: 0;
}

.pill-btn {
  font-family: 'Courier New', monospace;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .08em;
  border: 2px solid rgba(255,215,0,.5);
  cursor: pointer;
  background: linear-gradient(180deg, rgba(255,215,0,.2), rgba(255,194,0,.12));
  color: var(--gold2);
  padding: 12px 16px;
  white-space: nowrap;
  border-radius: 10px;
  transition: all .15s;
  min-height: 48px;
}
.pill-btn:hover { background: rgba(255,215,0,.25); border-color: var(--gold2); }

/* VI spoken mode button — large, high contrast */
.vi-mode-btn {
  font-family: 'Courier New', monospace;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .07em;
  cursor: pointer;
  border-radius: 10px;
  transition: all .15s;
  min-height: 60px;
  min-width: 140px;
  font-size: .88rem;
  border: 3px solid var(--red);
  background: linear-gradient(180deg, rgba(204,0,0,.2), rgba(168,0,0,.15));
  color: #ff9999;
  padding: 10px 14px;
  line-height: 1.3;
  text-align: center;
}
.vi-mode-btn:hover { background: rgba(204,0,0,.3); }
.vi-mode-btn.vi-active {
  background: linear-gradient(180deg, var(--red3), var(--red2));
  color: #fff;
  border-color: #ff4444;
  box-shadow: 0 0 20px rgba(204,0,0,.4);
}
.vi-mode-btn .vi-icon { display: block; font-size: 1.3rem; margin-bottom: 2px; }

/* ── VI MODE OVERLAY ── */
.vi-banner {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: linear-gradient(90deg, rgba(204,0,0,.15), rgba(0,48,135,.15));
  border: 2px solid rgba(204,0,0,.4);
  border-radius: 12px;
  margin-bottom: 14px;
  font-size: .88rem;
  color: #ff9999;
}
.vi-banner.show { display: flex; }
.vi-banner strong { color: #ffbbbb; }

/* ── SCREENS ── */
.screen { display: none; }
.screen.active { display: block; }

/* ── PANEL ── */
.panel {
  background: linear-gradient(180deg, rgba(10,20,50,.97) 0%, rgba(6,12,32,.98) 100%);
  border: 2px solid rgba(255,215,0,.2);
  color: var(--paper);
  padding: 22px;
  box-shadow: 0 16px 40px var(--shadow), inset 0 1px 0 rgba(255,255,255,.05);
  border-radius: 18px;
  position: relative;
}

.intro-panel h2,
.lesson-card h2 {
  margin: 0 0 10px;
  font-size: 32px;
  font-style: italic;
  letter-spacing: -.02em;
  color: var(--gold2);
}

.intro-panel p { font-size: 17px; line-height: 1.55; color: rgba(220,228,255,.8); }

/* ── PATH CARDS ── */
.path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.path-card {
  border: 2px solid rgba(255,215,0,.25);
  background: linear-gradient(160deg, rgba(0,48,135,.6) 0%, rgba(0,28,80,.8) 100%);
  color: var(--paper);
  padding: 24px;
  cursor: pointer;
  min-height: 170px;
  text-align: left;
  box-shadow: 0 8px 24px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,215,0,.08);
  transition: transform .12s ease, box-shadow .12s ease, border-color .15s;
  border-radius: 16px;
  font-family: Georgia, serif;
}
.path-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(0,0,0,.6), 0 0 0 2px rgba(255,215,0,.4);
  border-color: rgba(255,215,0,.5);
}
.path-card .icon { font-size: 46px; display: block; margin-bottom: 10px; }
.path-card strong { font-size: 26px; display: block; color: var(--gold2); }
.path-card small { display: block; margin-top: 8px; font-size: 14px; line-height: 1.4; color: var(--muted); }

/* ── COMMON BUTTON BASE ── */
.pill-btn, .small-btn, .mode-tab, .big-btn, .answer-btn {
  font-family: 'Courier New', monospace;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .08em;
  cursor: pointer;
  transition: transform .1s ease, filter .1s ease;
}
button:hover:not(:disabled) { transform: translateY(-1px); filter: brightness(1.06); }
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled { opacity: .5; cursor: not-allowed; }

/* ── TOP ROW ── */
.top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.small-btn {
  background: rgba(0,48,135,.7);
  border: 2px solid rgba(255,215,0,.3);
  color: var(--gold3);
  padding: 12px 14px;
  border-radius: 10px;
  white-space: nowrap;
  min-height: 48px;
}
.small-btn:hover { border-color: var(--gold2); background: rgba(0,48,135,.9); }

.redo-btn {
  background: rgba(204,0,0,.3);
  border-color: rgba(204,0,0,.5);
  color: #ff9999;
}
.redo-btn:hover { background: rgba(204,0,0,.5); }

/* ── MODE TABS ── */
.mode-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
  flex: 1;
}

.mode-tab {
  background: rgba(255,255,255,.04);
  border: 2px solid rgba(255,215,0,.15);
  color: var(--muted);
  padding: 13px 8px;
  border-radius: 10px;
  min-height: 48px;
}
.mode-tab.active {
  background: linear-gradient(180deg, rgba(255,215,0,.25), rgba(255,194,0,.15));
  border-color: var(--gold2);
  color: var(--gold2);
}

/* ── LESSON CARD ── */
.lesson-card { overflow: hidden; }
.lesson-heading { margin-bottom: 12px; }
.lesson-heading h2 { color: var(--gold2); }
.lesson-heading p:last-child { margin: 0; font-size: 17px; color: rgba(220,228,255,.75); }

/* ── INSTRUMENT CHOOSER ── */
.instrument-chooser {
  margin: 12px 0 14px;
  padding: 12px 14px;
  border: 2px solid rgba(255,215,0,.2);
  background: rgba(0,48,135,.3);
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  border-radius: 12px;
}
.instrument-chooser.hidden { display: none; }
.instrument-chooser label {
  font-family: 'Courier New', monospace;
  font-weight: 900;
  text-transform: uppercase;
  color: var(--gold3);
  font-size: .8rem;
  letter-spacing: .08em;
}
.instrument-chooser select {
  padding: 10px 12px;
  border: 2px solid rgba(255,215,0,.3);
  background: rgba(0,32,92,.8);
  color: var(--paper);
  font-size: 16px;
  border-radius: 8px;
}

/* ── STAFF CARD ── */
.staff-card {
  background: rgba(0,16,48,.7);
  border: 2px solid rgba(255,215,0,.2);
  padding: 18px;
  margin: 14px 0;
  text-align: center;
  border-radius: 16px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: inset 0 0 30px rgba(0,0,0,.4);
  position: relative;
}

.staff-label {
  font-family: 'Courier New', monospace;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--gold2);
  font-weight: bold;
  font-size: 12px;
}

.staff-display {
  font-size: clamp(40px, 11vw, 86px);
  font-weight: 900;
  letter-spacing: .06em;
  margin: 14px 0 8px;
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-shadow: 0 0 20px rgba(255,215,0,.2);
}

.hint-display {
  font-size: 17px;
  color: var(--muted);
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.5;
}

/* VI mode hint — larger, higher contrast */
body.vi-mode .hint-display {
  font-size: 1.2rem;
  color: #ccd8ff;
  line-height: 1.7;
}
body.vi-mode .staff-display {
  font-size: clamp(48px, 13vw, 100px);
  color: var(--gold2);
}

/* ── CONTROLS ── */
.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 14px 0;
}

.big-btn {
  background: linear-gradient(180deg, var(--red3), var(--red2));
  color: #fff;
  border: 2px solid rgba(255,255,255,.15);
  padding: 16px 14px;
  font-size: 17px;
  border-radius: 12px;
  box-shadow: 0 4px 0 rgba(0,0,0,.5);
  min-height: 56px;
}
.big-btn.secondary {
  background: linear-gradient(180deg, var(--navy3), var(--navy));
  box-shadow: 0 4px 0 rgba(0,0,0,.5);
}
body.vi-mode .big-btn {
  min-height: 76px;
  font-size: 1.1rem;
}

/* ── ANSWER GRID ── */
.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 11px;
}

.answer-btn {
  background: linear-gradient(180deg, rgba(0,48,135,.7), rgba(0,32,92,.85));
  border: 2px solid rgba(255,215,0,.2);
  color: var(--paper);
  min-height: 68px;
  font-size: 20px;
  padding: 11px;
  border-radius: 12px;
  box-shadow: 0 4px 0 rgba(0,0,0,.4);
  transition: border-color .15s, background .15s;
}
.answer-btn:hover:not(:disabled) { border-color: var(--gold2); background: rgba(0,64,160,.8); }
.answer-btn.correct { background: linear-gradient(180deg, rgba(20,160,80,.7), rgba(10,100,50,.8)); border-color: #44ff88; color: #44ff88; }
.answer-btn.wrong { background: linear-gradient(180deg, rgba(180,30,30,.7), rgba(120,10,10,.8)); border-color: #ff6666; color: #ffaaaa; }
.answer-btn.sound-card { flex-direction: column; display: flex; align-items: center; justify-content: center; gap: 4px; }
.answer-btn.sound-card small { font-size: 11px; color: var(--gold3); letter-spacing: .1em; opacity: .8; }
.answer-btn.start-quiz {
  grid-column: 1 / -1;
  background: linear-gradient(180deg, rgba(255,215,0,.22), rgba(255,194,0,.14));
  border-color: var(--gold2);
  color: var(--gold2);
}
.answer-btn.start-quiz small { color: var(--gold3); opacity: .8; }
.answer-btn.start-quiz span { font-size: 22px; }

body.vi-mode .answer-btn {
  min-height: 88px;
  font-size: 1.3rem;
}

/* ── PROGRESS STRIP ── */
.progress-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 14px;
}
.progress-strip > div {
  border: 2px solid rgba(255,215,0,.15);
  background: rgba(0,16,48,.6);
  padding: 10px;
  border-radius: 10px;
}
.mini-label {
  display: block;
  font-family: 'Courier New', monospace;
  text-transform: uppercase;
  font-size: 10px;
  color: var(--gold2);
  letter-spacing: .12em;
  margin-bottom: 4px;
  opacity: .7;
}
.progress-strip strong { font-size: 16px; color: var(--paper); }

/* ── PLAYBACK PANEL ── */
.playback-panel {
  margin-top: 14px;
  padding: 14px;
  border: 2px solid rgba(255,215,0,.2);
  border-radius: 16px;
  background: rgba(0,16,48,.75);
  box-shadow: 0 4px 0 rgba(0,0,0,.4);
}
.playback-panel.hidden { display: none; }
.playback-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.playback-header strong { display: block; font-size: 16px; color: var(--paper); }
.mini-label { display: block; font-family: 'Courier New', monospace; text-transform: uppercase; font-size: 10px; color: var(--gold2); letter-spacing: .12em; margin-bottom: 3px; }

.playback-clear {
  font-family: 'Courier New', monospace;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .08em;
  border: 2px solid rgba(255,215,0,.3);
  background: rgba(0,48,135,.5);
  color: var(--gold3);
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: all .15s;
  min-height: 44px;
}
.playback-clear:hover { border-color: var(--gold2); background: rgba(0,48,135,.8); }

.played-back-display {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed rgba(255,215,0,.2);
  background: rgba(0,0,0,.3);
  border-radius: 12px;
  font-family: 'Courier New', monospace;
  font-weight: 900;
  letter-spacing: .15em;
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--gold2);
}

.playback-keys {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
  gap: 9px;
}

.playback-key {
  min-height: 76px;
  border: 2px solid rgba(255,215,0,.25);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(0,48,135,.7), rgba(0,28,80,.85));
  color: var(--paper);
  box-shadow: 0 4px 0 rgba(0,0,0,.4);
  font-family: 'Courier New', monospace;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-size: 18px;
  cursor: pointer;
  transition: all .12s;
}
.playback-key:hover:not(:disabled) { border-color: var(--gold2); transform: translateY(-2px); }
.playback-key:active:not(:disabled) { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,.4); }
.playback-key.playing { background: linear-gradient(180deg, rgba(255,215,0,.3), rgba(255,194,0,.2)); border-color: var(--gold2); }
.playback-key.correct { background: linear-gradient(180deg, rgba(20,160,80,.6), rgba(10,100,50,.7)); border-color: #44ff88; color: #44ff88; }
.playback-key.wrong { background: linear-gradient(180deg, rgba(180,30,30,.6), rgba(120,10,10,.7)); border-color: #ff6666; color: #ffaaaa; }

.piece-instructions {
  grid-column: 1 / -1;
  min-height: 76px;
  border: 2px solid rgba(255,215,0,.2);
  border-radius: 12px;
  background: rgba(0,32,92,.5);
  padding: 14px;
  font-size: 17px;
  line-height: 1.4;
  text-align: center;
  color: rgba(220,228,255,.85);
}

/* ── PIANO KEYBOARD ── */
.piano-keyboard {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 4px;
  padding: 14px 10px 10px;
  min-height: 150px;
  border: 2px solid rgba(255,215,0,.2);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(0,16,48,.95), rgba(0,8,28,.98));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.04), 0 5px 0 rgba(0,0,0,.4);
}
.piano-keyboard .piano-key {
  position: relative;
  flex: 1 1 70px;
  max-width: 118px;
  min-height: 128px;
  border: 2px solid rgba(255,255,255,.12);
  border-radius: 0 0 12px 12px;
  background: linear-gradient(180deg, rgba(240,244,255,.9) 0%, rgba(200,215,255,.85) 70%, rgba(150,175,220,.8) 100%);
  color: var(--navy2);
  box-shadow: inset 0 -8px 14px rgba(0,32,92,.1), 0 5px 0 rgba(0,0,0,.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  padding: 12px 8px;
  transition: all .1s;
}
.piano-keyboard .piano-key .key-note {
  font-family: Georgia, serif;
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
}
.piano-keyboard .piano-key small {
  font-family: 'Courier New', monospace;
  font-weight: 900;
  letter-spacing: .1em;
  color: var(--navy);
  font-size: 11px;
}
.piano-keyboard .left-hand-key {
  background: linear-gradient(180deg, rgba(220,228,255,.9) 0%, rgba(180,200,240,.85) 70%, rgba(130,160,210,.8) 100%);
}
.piano-keyboard .piano-key.playing {
  background: linear-gradient(180deg, rgba(255,220,50,.9), rgba(255,194,0,.85));
  transform: translateY(3px);
  box-shadow: inset 0 -5px 10px rgba(100,60,0,.15), 0 2px 0 rgba(0,0,0,.4);
}
.piano-keyboard .piano-key.correct { background: linear-gradient(180deg, rgba(80,220,130,.85), rgba(40,160,90,.8)); }
.piano-keyboard .piano-key.wrong { background: linear-gradient(180deg, rgba(255,100,100,.85), rgba(200,40,40,.8)); }

/* ── BRASS VALVES ── */
.brass-valves, .trombone-positions {
  grid-template-columns: repeat(3, 1fr);
  align-items: stretch;
}
.brass-help {
  grid-column: 1 / -1;
  border: 2px dashed rgba(255,215,0,.2);
  border-radius: 14px;
  background: rgba(0,32,92,.4);
  padding: 12px 14px;
  font-size: 15px;
  line-height: 1.4;
  color: rgba(220,228,255,.75);
}
.brass-valve-key, .brass-position-key, .brass-submit-key {
  min-height: 96px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}
.brass-valve-key span, .brass-position-key span, .brass-submit-key span { font-size: 32px; line-height: 1; font-weight: 900; }
.brass-valve-key small, .brass-position-key small, .brass-submit-key small { font-size: 11px; opacity: .7; letter-spacing: .12em; text-transform: uppercase; }
.brass-valve-key.pressed {
  background: linear-gradient(180deg, rgba(255,220,50,.3), rgba(255,194,0,.2));
  border-color: var(--gold2);
  color: var(--gold2);
  transform: translateY(3px);
  box-shadow: 0 2px 0 rgba(0,0,0,.4), inset 0 0 0 2px rgba(255,215,0,.15);
}
.brass-submit-key { grid-column: span 2; background: linear-gradient(180deg, rgba(255,215,0,.2), rgba(255,194,0,.12)); border-color: rgba(255,215,0,.4); color: var(--gold2); }
.brass-open-key { grid-column: span 1; }
.trombone-positions { grid-template-columns: repeat(6, 1fr); }

/* ── LESSON ACTIONS ── */
.lesson-actions-note {
  font-family: 'Courier New', monospace;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
  margin-top: 8px;
  text-align: center;
  text-transform: uppercase;
}

/* ── RESPONSIVE ── */
@media (max-width: 820px) {
  .hero, .top-row { flex-direction: column; align-items: stretch; }
  .vi-toggle-wrap { align-items: stretch; }
  .path-grid, .answer-grid, .controls, .progress-strip { grid-template-columns: 1fr; }
  .mode-tabs { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .piano-keyboard { gap: 3px; padding: 10px 6px 8px; min-height: 116px; }
  .piano-keyboard .piano-key { min-height: 100px; padding: 10px 4px; }
  .piano-keyboard .piano-key .key-note { font-size: 24px; }
  .trombone-positions { grid-template-columns: repeat(3, 1fr); }
  .brass-valves { grid-template-columns: repeat(2, 1fr); }
  .brass-submit-key, .brass-open-key { grid-column: span 1; }
  .playback-header { flex-direction: column; align-items: stretch; }
}

/* ── VI MODE GLOBAL ENHANCEMENTS ── */
body.vi-mode .panel { border-color: rgba(255,215,0,.35); }
body.vi-mode .playback-key { min-height: 92px; font-size: 1.1rem; }
body.vi-mode .answer-btn { min-height: 92px; font-size: 1.25rem; }
body.vi-mode .mode-tab { min-height: 58px; font-size: .82rem; }
body.vi-mode .small-btn { min-height: 58px; }