:root {
  --primary: #ff6f61;
  --primary-dark: #e85a4f;
  --secondary: #3aafa9;
  --secondary-dark: #2b8c87;
  --accent: #ffc94d;
  --dark: #2b2d42;
  --muted: #6b7280;
  --bg: #f6f8fb;
  --card-bg: #ffffff;
  --border: #e5e9f0;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow-sm: 0 2px 6px rgba(43, 45, 66, 0.06);
  --shadow-md: 0 8px 24px rgba(43, 45, 66, 0.1);
  --shadow-lg: 0 16px 40px rgba(43, 45, 66, 0.14);
  --font-heading: "Baloo 2", "Segoe UI", Verdana, sans-serif;
  --font-body: "Nunito", "Segoe UI", Verdana, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--dark);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
}

/* ---------- Header ---------- */

.app-header {
  background: linear-gradient(120deg, var(--primary) 0%, #ff9472 45%, var(--secondary) 100%);
  color: white;
  padding: 36px 16px 44px;
  box-shadow: var(--shadow-md);
}

.app-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: 0.01em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.subtitle {
  margin: 8px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  opacity: 0.95;
}

/* ---------- Layout ---------- */

.app-main {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 24px;
  max-width: 1100px;
  margin: -24px auto 24px;
  padding: 0 16px;
  position: relative;
}

@media (max-width: 800px) {
  .app-main {
    grid-template-columns: 1fr;
    margin-top: -16px;
  }
}

/* ---------- Controls ---------- */

.controls {
  grid-column: 1 / -1;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 18px;
}

@media (max-width: 640px) {
  .controls-grid {
    grid-template-columns: 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
}

.controls label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  display: block;
  margin-bottom: 6px;
  color: var(--dark);
}

#levelSelect,
#voiceSelect,
#wordInput {
  width: 100%;
  padding: 11px 14px;
  font-family: var(--font-body);
  font-size: 1rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: #fbfcfe;
  color: var(--dark);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#levelSelect:focus,
#voiceSelect:focus,
#wordInput:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(58, 175, 169, 0.18);
}

.level-desc {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 6px 0 0;
}

.word-form {
  border-top: 1px solid var(--border);
  padding-top: 18px;
  margin-top: 4px;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

/* ---------- Buttons ---------- */

.primary-btn,
.secondary-btn,
.play-btn {
  border: none;
  border-radius: 999px;
  padding: 11px 20px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
  box-shadow: var(--shadow-sm);
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
}

.secondary-btn {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: white;
}

.play-btn {
  background: linear-gradient(135deg, var(--accent), #ffb020);
  color: #4a3400;
}

.primary-btn:hover,
.secondary-btn:hover,
.play-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.03);
}

.primary-btn:active,
.secondary-btn:active,
.play-btn:active {
  transform: translateY(0);
}

.primary-btn:focus-visible,
.secondary-btn:focus-visible,
.play-btn:focus-visible {
  outline: 3px solid rgba(43, 45, 66, 0.35);
  outline-offset: 2px;
}

/* ---------- Result cards ---------- */

.results {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 14px;
  color: var(--primary-dark);
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hint {
  color: var(--muted);
  font-size: 0.92rem;
}

.word-row {
  margin-bottom: 12px;
}

.iso-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
}

.iso-block {
  background: #f4f6fb;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}

.iso-label {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.iso-value {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), #ffb020);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.sound-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  padding: 5px 9px;
  border-radius: 8px;
  transition: background 0.12s ease, transform 0.12s ease;
}

.sound-unit:hover {
  background: rgba(255, 255, 255, 0.55);
  transform: translateY(-1px);
}

.sound-letters {
  font-size: 0.82rem;
  color: rgba(43, 45, 66, 0.65);
  font-weight: 600;
}

.sound-phoneme {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--dark);
}

.syllable-row,
.box-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.syllable-chip {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: white;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.syllable-chip:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.sound-box {
  min-width: 66px;
  height: 66px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  cursor: pointer;
  background: white;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.sound-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.sound-box .sound-letters {
  font-size: 0.72rem;
}

.sound-box .sound-phoneme {
  font-size: 1.25rem;
  color: var(--dark);
}

.sound-box-silent {
  border-color: #d8dce3;
  color: #b6bac2;
  cursor: default;
}

.sound-box-silent:hover {
  transform: none;
  box-shadow: none;
}

.sound-box-silent .sound-letters {
  color: #b6bac2;
}

.bubble {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 9px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.bubble:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.bubble-letters {
  font-size: 0.75rem;
  opacity: 0.85;
}

.bubble-sound {
  font-size: 1.15rem;
}

.bubble-silent {
  background: #dfe2e8;
  color: #97a0ad;
  cursor: default;
  box-shadow: none;
}

.bubble-silent:hover {
  transform: none;
}

.manip-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.manip-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.manip-result {
  font-weight: 800;
  color: var(--primary-dark);
}

.manip-input {
  width: 110px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  font-family: var(--font-body);
}

.manip-input:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(58, 175, 169, 0.18);
}

/* ---------- Saved words sidebar ---------- */

.saved-words {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  height: fit-content;
}

.saved-words h3 {
  margin-top: 0;
  font-size: 1.05rem;
  color: var(--primary-dark);
}

.word-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.word-list li {
  display: flex;
  gap: 6px;
}

.word-chip {
  flex: 1;
  text-align: left;
  background: #f4f6fb;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--dark);
  transition: background 0.12s ease;
}

.word-chip:hover {
  background: #eaeefa;
}

.word-del {
  border: none;
  background: #ffe0e0;
  color: #c33d3d;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0 12px;
  font-weight: 700;
  transition: background 0.12s ease;
}

.word-del:hover {
  background: #ffcccc;
}

/* ---------- Footer ---------- */

.app-footer {
  text-align: center;
  padding: 20px 16px 32px;
  color: var(--muted);
  font-size: 0.9rem;
}

.share-qr {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.share-qr img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: white;
  padding: 8px;
  box-shadow: var(--shadow-sm);
}

/* ---------- Customize Sounds panel ---------- */

.sound-lab {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 18px 22px 22px;
  margin: 20px auto;
  max-width: 1100px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.sound-lab summary {
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--dark);
  padding: 4px 0;
  list-style: none;
}

.sound-lab summary::-webkit-details-marker {
  display: none;
}

.sound-lab summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--secondary-dark);
  transition: transform 0.15s ease;
}

.sound-lab[open] summary::before {
  transform: rotate(90deg);
}

.sound-lab .hint {
  margin: 10px 0;
}

.sound-lab-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

.sound-lab-group-title {
  margin: 18px 0 8px;
  color: var(--primary-dark);
  font-size: 1rem;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
}

.sound-lab-group-title:first-child {
  margin-top: 4px;
}

.sound-lab-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  background: #f9fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

.sound-lab-label {
  font-family: var(--font-heading);
  font-weight: 700;
  min-width: 42px;
  color: var(--dark);
}

.sound-lab-text {
  flex: 1;
  min-width: 100px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-family: var(--font-body);
  background: white;
}

.sound-lab-text:focus,
.sound-lab-rate:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(58, 175, 169, 0.18);
}

.sound-lab-text:disabled,
.sound-lab-rate:disabled {
  background: #eef0f4;
  color: #a6acb8;
}

.sound-lab-rate {
  width: 74px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-family: var(--font-body);
  background: white;
}

.sound-lab-row .play-btn,
.sound-lab-row .secondary-btn {
  padding: 8px 14px;
  font-size: 0.88rem;
}

.sound-lab-recording {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding-left: 10px;
  margin-left: 2px;
  border-left: 2px solid var(--border);
}

.sound-lab-rec-status {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  min-width: 140px;
}

.sound-lab-rec-status.sound-lab-rec-active {
  color: #1f8a4c;
}

.sound-lab-rec-btn {
  background: linear-gradient(135deg, #ff8a80, #e85a4f);
  color: white;
  box-shadow: var(--shadow-sm);
}