/* ==========================================================
   Ear Training — redesign styles
   ========================================================== */

:root {
  --c-waves:      #2fb3e8;
  --c-filters:    #e74c3c;
  --c-distortion: #f4a62a;
  --c-synthesis:  #1abc9c;
  --c-adsr:       #3fc163;
  --c-accent:     #f4a62a;
  --c-accent-deep:#e5962a;
  --c-ok:         #78b744;
  --c-err:        #e9635f;
  --c-ink:        #1c1c1c;
  --c-ink-2:      #3f3f3f;
  --c-ink-3:      #6b6b6b;
  --c-rule:       #ececec;
  --c-rule-2:     #d4d4d4;
  --c-rule-soft:  #f1f1f1;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
button { font-family: inherit; cursor: pointer; }

body { padding-bottom: 0; }

/* ---------- Page wrapper ---------- */
.all {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 22px 16px;
}

/* ---------- Chapter navigation ---------- */
.et-chapter-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

/* Mobile dropdown: hidden on desktop */
.et-chapter-drop { display: none; }

.et-chapter-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-ink-3);
  text-decoration: none;
  border: 0;
  background: transparent;
  transition: color 0.15s ease, background 0.15s ease;
}

.et-chapter-nav a:hover { color: var(--c-ink); }

.et-chapter-nav a.is-active {
  background: var(--c);
  color: #fff;
}

/* ---------- Section header ---------- */
.et-section-head { margin-bottom: 22px; }

.et-head-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: end;
}

.et-title-wrap { min-width: 0; }

.et-brand {
  margin: 0 0 2px;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-ink-3);
}

.et-title {
  margin: 0 0 4px;
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--c);
  line-height: 1;
}

.et-sub {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-ink-2);
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}

.et-sub-level { color: var(--c-ink); font-weight: 800; }
.et-sub-sep   { color: var(--c-rule-2); }
.et-sub-name  {
  color: var(--c-ink-3);
  font-weight: 600;
  min-width: 0;
  overflow-wrap: anywhere;
}

.et-score-wrap {
  text-align: right;
  display: grid;
  justify-items: end;
  gap: 4px;
}

.et-score-label {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-ink-3);
}

.et-score-figure {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
}

.et-score-correct { color: var(--c-ok); }
.et-score-sep     { color: var(--c-rule-2); font-weight: 700; }
.et-score-total   { color: var(--c-ink-3); }

.et-rule {
  height: 5px;
  background: var(--c);
  margin: 14px 0 0;
}

/* ---------- Levels — stepper ---------- */
.et-lvl { margin-bottom: 28px; }

.step-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  align-items: start;
  padding: 14px 8px 4px;
  overflow: visible;
}

.step-rail {
  position: absolute;
  left: calc(100% / 12);
  right: calc(100% / 12);
  top: 26px;
  height: 2px;
  background: var(--c-rule);
}

.step-rail-fill {
  position: absolute;
  left: calc(100% / 12);
  top: 26px;
  height: 2px;
  background: var(--c);
  transition: width 0.25s ease;
}

.step {
  position: relative;
  display: grid;
  justify-items: center;
  row-gap: 8px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
}

.step-node {
  width: 28px;
  height: 28px;
  background: #fff;
  border: 2px solid var(--c-rule-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.86rem;
  color: var(--c-ink-3);
  transition: all 0.15s ease;
  z-index: 1;
}

.step.is-played .step-node { border-color: var(--c); color: var(--c); }
.step.is-active .step-node { background: var(--c); border-color: var(--c); color: #fff; transform: scale(1.15); }

.step-stars { min-height: 12px; }

.step-tip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-ink);
  color: #fff;
  padding: 8px 10px;
  width: 180px;
  font-size: 0.74rem;
  line-height: 1.35;
  font-weight: 600;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s ease;
  display: grid;
  gap: 2px;
  z-index: 10;
}

.step-tip::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 10px;
  height: 10px;
  background: var(--c-ink);
}

.tip-name  { font-weight: 800; letter-spacing: 0.04em; }
.tip-score { color: var(--c); font-weight: 700; font-family: var(--font-mono); font-size: 0.72rem; }

.step:hover .step-tip,
.step:focus-visible .step-tip { opacity: 1; }
.step:last-child .step-tip  { left: auto; right: 0; transform: none; }
.step:last-child .step-tip::before { left: auto; right: 14px; transform: rotate(45deg); }
.step:first-child .step-tip { left: 0; transform: none; }
.step:first-child .step-tip::before { left: 14px; transform: rotate(45deg); }

/* ---------- Level-up overlay ---------- */
.promo-wrap {
  position: absolute;
  top: 27px;
  transform: translate(-50%, -50%);
  z-index: 5;
  pointer-events: none;
}

.promo {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  pointer-events: auto;
  animation: promo-pop 0.4s cubic-bezier(.2,.7,.2,1);
}

@keyframes promo-pop {
  0%   { opacity: 0; transform: translate(-50%, calc(-50% + 4px)) scale(0.9); }
  100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.promo-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  background: var(--c);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 5px 8px;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 12px -4px rgba(0,0,0,0.3);
  position: relative;
  isolation: isolate;
}

.promo-pill::after {
  content: '';
  position: absolute;
  inset: -5px;
  background: var(--c);
  opacity: 0.18;
  z-index: -1;
  filter: blur(6px);
  animation: promo-pulse 1.6s ease-in-out infinite;
}

@keyframes promo-pulse {
  0%, 100% { opacity: 0.10; transform: scale(0.95); }
  50%      { opacity: 0.28; transform: scale(1.08); }
}

.promo-pill:hover { filter: brightness(1.05); }

.promo-arrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 900;
  animation: promo-nudge 1.4s ease-in-out infinite;
}

@keyframes promo-nudge {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(2px); }
}

.promo-x {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--c-rule-2);
  background: #fff;
  color: var(--c-ink-2);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  border-radius: 50%;
  box-shadow: 0 2px 6px -2px rgba(0,0,0,0.2);
  padding: 0 0 2px;
  z-index: 2;
}

.promo-x:hover { background: var(--c-rule); color: var(--c-ink); }

.step.is-promo .step-node {
  box-shadow: 0 0 0 0 var(--c);
  animation: node-pulse 1.6s ease-out infinite;
}

@keyframes node-pulse {
  0%  { box-shadow: 0 0 0 0   var(--c); }
  70% { box-shadow: 0 0 0 10px transparent; }
  100%{ box-shadow: 0 0 0 0   transparent; }
}

/* ---------- Game card ---------- */
.et-game {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 0px 0;
}

.et-prompt {
  grid-column: 2;
  grid-row: 1;
}

.et-play-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  grid-column: 1;
  grid-row: 2;
  align-self: start;
}

.et-play-caption {
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-ink-3);
}

.et-play-btn {
  border-radius: 50%;
  border: 5px solid var(--c-accent);
  background: #fff;
  cursor: pointer;
  position: relative;
  transition: transform 0.15s ease, background 0.15s ease;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.et-play-btn:hover  { transform: scale(1.04); }
.et-play-btn:active { transform: scale(0.97); }

.et-play-tri {
  display: block;
  width: 0; height: 0;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-left: 26px solid var(--c-accent);
  margin-left: 6px;
}

.et-play-btn.et-play-next { background: var(--c-accent); }
.et-play-btn.et-play-next .et-play-tri { display: none; }

.et-play-text {
  font-size: 0.56rem;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: #fff;
  text-transform: uppercase;
  text-align: center;
}

.et-game-body {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
}

.et-prompt {
  margin: 0 0 18px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-ink-2);
  line-height: 1.3;
}

.et-answers { display: grid; gap: 8px; }

.et-ans {
  display: grid;
  grid-template-columns: 30px 110px 80px;
  justify-content: start;
  align-items: center;
  gap: 14px;
  border: 0;
  background: transparent;
  padding: 8px 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.et-ans:disabled { cursor: default; }

.et-ans-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 4px solid var(--c-accent);
  background: #fff;
  position: relative;
  transition: background 0.15s ease;
  flex-shrink: 0;
}

.et-ans.et-ans-selected .et-ans-dot { background: var(--c-accent); }
.et-ans.et-ans-correct  .et-ans-dot { border-color: var(--c-ok);  background: var(--c-ok);  }
.et-ans.et-ans-wrong    .et-ans-dot { border-color: var(--c-err); background: var(--c-err); }
.et-ans.et-ans-muted    .et-ans-dot { border-color: var(--c-rule-2); opacity: 0.5; }

.et-ans-label {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--c-ink-2);
  line-height: 1;
}

.et-ans.et-ans-correct .et-ans-label { color: var(--c-ok);  }
.et-ans.et-ans-wrong   .et-ans-label { color: var(--c-err); }
.et-ans.et-ans-muted   .et-ans-label { color: var(--c-ink-3); opacity: 0.6; }
.et-ans.et-ans-muted   .et-ans-wave  { opacity: 0.45; }

.et-ans-wave { width: 80px; display: block; }

.et-status {
  margin: 14px 0 0;
  min-height: 22px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-ink-3);
}

.et-status-ok  { color: var(--c-ok);  }
.et-status-err { color: var(--c-err); }

.et-hear-correct {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: 10px;
  border: 0;
  background: transparent;
  color: var(--c-accent);
  font: inherit;
  font-weight: 800;
  font-size: 0.82rem;
  cursor: pointer;
  padding: 2px 8px 2px 4px;
  border-bottom: 2px solid var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.et-hear-correct:hover { color: var(--c-accent-deep); border-color: var(--c-accent-deep); }

.et-hc-tri {
  width: 0; height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 9px solid currentColor;
  display: inline-block;
}

/* ---------- Mobile bottom navigation ---------- */
.et-bottom-nav {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 60;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--c-rule);
  padding: 4px 0 calc(4px + env(safe-area-inset-bottom));
}

.et-bottom-item {
  flex: 1;
  border: 0;
  background: transparent;
  cursor: pointer;
  display: grid;
  justify-items: center;
  gap: 2px;
  padding: 6px 2px 4px;
  font: inherit;
  position: relative;
  color: var(--c-ink-3);
  text-decoration: none;
}

.et-bottom-glyph {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: 1.5px solid currentColor;
  color: currentColor;
}

.et-bottom-label {
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.et-bottom-bar {
  position: absolute;
  top: 0;
  left: 30%; right: 30%;
  height: 3px;
  background: var(--c);
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.et-bottom-item.is-active            { color: var(--c); }
.et-bottom-item.is-active .et-bottom-bar { transform: scaleX(1); }

/* ==========================================================
   Legacy game area — filters / effects / synthesis / adsr
   ========================================================== */

.game-grid {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 0px 0;
}

.game-grid > .prompt {
  grid-column: 2;
  grid-row: 1;
}

.play-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  grid-column: 1;
  grid-row: 2;
  align-self: start;
}

.answers-block {
  grid-column: 2;
  grid-row: 2;
}

.play-btn {
  width: 84px; height: 84px;
  border-radius: 50%;
  border: 5px solid var(--c-accent);
  background: #fff;
  cursor: pointer;
  position: relative;
  transition: transform 0.15s ease;
  padding: 0;
}
.play-btn::before {
  content: '';
  position: absolute;
  left: 28px; top: 21px;
  width: 0; height: 0;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-left: 26px solid var(--c-accent);
}
.play-btn.next-round::before,
.play-btn.is-looping::before { display: none; }
.play-btn.next-round .play-btn-label { display: flex; }
.play-btn:hover  { transform: scale(1.04); }
.play-btn:active { transform: scale(0.97); }

.play-btn-label {
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.54rem;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--c-accent);
  text-transform: uppercase;
  text-align: center;
  padding: 4px;
  width: 100%; height: 100%;
}

.bypass-btn {
  width: 72px; height: 34px;
  border-radius: 17px;
  border: 3px solid var(--c-rule-2);
  background: #fff;
  color: var(--c-ink-3);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.bypass-btn:hover { border-color: var(--c-ink-3); color: var(--c-ink); }
.bypass-btn:active { transform: scale(0.97); }
.bypass-btn.is-looping { border-color: var(--c-accent); color: var(--c-accent); }

.prompt { margin: 0 0 0px; font-size: 1.05rem; font-weight: 700; color: var(--c-ink-2); line-height: 1.3; }

.answers-block { min-width: 0; }
.answers { display: grid; gap: 8px; max-width: 560px; }

.answer-btn {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  align-items: center;
  gap: 14px;
  border: 0;
  background: transparent;
  padding: 8px 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
}
.answer-btn:disabled { cursor: default; }

.et-filter-game .answer-btn {
  grid-template-columns: 30px 110px 80px;
  justify-content: start;
}

.answer-dot {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 4px solid var(--c-accent);
  background: #fff;
  position: relative;
  transition: background 0.15s;
  flex-shrink: 0;
}
.answer-btn.selected .answer-dot::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--c-accent);
}
.answer-btn.correct .answer-dot { border-color: var(--c-ok); background: var(--c-ok); }
.answer-btn.wrong   .answer-dot { border-color: var(--c-err); background: var(--c-err); }

.answer-label {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--c-ink-2);
  line-height: 1;
}
.answer-btn.correct .answer-label { color: var(--c-ok); }
.answer-btn.wrong   .answer-label { color: var(--c-err); }

.filter-sprite { width: 80px; flex-shrink: 0; }
.filter-sprite img { display: block; width: 100%; height: auto; }

.status { margin: 14px 0 0; min-height: 22px; font-size: 0.88rem; font-weight: 600; color: var(--c-ink-3); }
.status.ok   { color: var(--c-ok); }
.status.err  { color: var(--c-err); }
.status.info { color: var(--c-ink-3); }
.status .status-wave-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-left: 8px; border: 0; background: transparent;
  color: var(--c-accent); font: inherit; font-weight: 800;
  font-size: 0.82rem; cursor: pointer;
  padding: 2px 8px 2px 4px;
  border-bottom: 2px solid var(--c-accent);
  text-transform: uppercase; letter-spacing: 0.06em; text-decoration: none;
}
.status .status-wave-link:hover { color: var(--c-accent-deep); border-color: var(--c-accent-deep); }

.et-level-select {
  border: 1.5px solid var(--c-rule-2);
  background: #fff;
  color: var(--c-ink-2);
  padding: 5px 10px;
  font: inherit;
  font-weight: 700;
  font-size: 0.74rem;
  outline: none;
  cursor: pointer;
  margin-bottom: 22px;
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 760px) {
  .all { padding: 54px 14px 14px; }

  /* Hide desktop tabs; show dropdown centered */
  .et-chapter-nav > a { display: none; }
  .et-chapter-nav     { justify-content: center; }
  .et-chapter-drop    { display: block; position: relative; margin-top: 10px; }
  .et-bottom-nav      { display: none; }

  .et-brand { display: none; }

  .et-chapter-drop-btn {
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px 8px 8px;
    background: transparent;
    color: var(--c-ink);
    
    font-family: inherit;
    font-weight: 800;
    font-size: 0.9rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
    outline: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
  }
  .et-chapter-drop-btn::-webkit-details-marker { display: none; }
  details[open] .et-chapter-drop-btn { background: var(--c-ink); color: #fff; }

  .et-drop-ear {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
  }

  .et-chapter-drop-arrow {
    display: inline-block;
    width: 0; height: 0;
    border-left: 7px solid transparent;
    border-right: 7px solid transparent;
    border-top: 8px solid currentColor;
    margin-left: 4px;
    transition: transform 0.18s ease;
  }
  details[open] .et-chapter-drop-arrow { transform: rotate(180deg); }

  .et-chapter-drop-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 50;
    background: #fff;
    box-shadow: 0 6px 20px -4px rgba(0,0,0,0.18);
    min-width: 180px;
    display: flex;
    flex-direction: column;
    border-top: 2px solid var(--c-rule);
  }

  .et-chapter-drop-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--c-ink-3);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: color 0.12s ease, border-color 0.12s ease;
  }
  .et-chapter-drop-menu a.is-active {
    color: #ffffff;
    border-left-color: var(--c);
  }
  .et-chapter-drop-menu a:hover { color: var(--c-ink); }

  /* Header */
  .et-head-row { grid-template-columns: minmax(0, 1fr) auto; align-items: end; }
  .et-title    { font-size: 1.8rem; }
  .et-sub      { font-size: 0.82rem; }
  .et-score-figure { font-size: 1.5rem; }
  .et-rule { margin-top: 10px; height: 4px; }

  /* Stepper */
  .step-track  { padding: 10px 4px 4px; }
  .step-node   { width: 24px; height: 24px; font-size: 0.78rem; }
  .step-rail, .step-rail-fill { top: 22px; }
  .step-tip    { width: 150px; font-size: 0.7rem; }

  /* Game */
  .et-game         { grid-template-columns: 76px 1fr; gap: 14px; padding: 10px 0 16px; }
  .et-play-btn     { border-width: 4px; }
  .et-play-btn[style*="84"] { width: 70px !important; height: 70px !important; }
  .et-play-tri     { border-top-width: 14px; border-bottom-width: 14px; border-left-width: 22px; margin-left: 5px; }
  .et-play-text    { font-size: 0.48rem; }
  .et-prompt       { font-size: 0.95rem; margin-bottom: 12px; }
  .et-ans          { grid-template-columns: 26px 88px 70px; justify-content: start; gap: 10px; padding: 6px 0; }
  .et-ans-dot      { width: 22px; height: 22px; border-width: 3px; }
  .et-ans-label    { font-size: 1rem; }

  /* Legacy game */
  .game-grid       { grid-template-columns: 76px 1fr; gap: 14px; padding: 10px 0 16px; }
  .play-btn        { width: 70px !important; height: 70px !important; border-width: 4px; }
  .play-btn::before { left: 22px; top: 17px; border-top-width: 14px; border-bottom-width: 14px; border-left-width: 22px; }
  .answer-btn      { grid-template-columns: 26px 1fr auto; gap: 10px; padding: 6px 0; }
  .et-filter-game .answer-btn { grid-template-columns: 26px 88px 60px; justify-content: start; }
  .answer-dot      { width: 22px; height: 22px; border-width: 3px; }
  .answer-label    { font-size: 1rem; }
  .filter-sprite   { width: 60px; }
  .filter-sprite img { width: 60px; }
}