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

:root {
  --page: #FFFFF9;
  --panel: #FFFFF9;
  --field: #F0F3F3;
  --text: #1D1F25;
  --muted: #555;
  --soft: #888;
  --line: #e0ddd8;
  --line-strong: #ccc;
  --green: #607D74;
  --green-dark: #19453B;
  --ink: #28261B;
  --blue-soft: #DCECEF;
  --highlight: #B8C4F0;
  --error: #C26148;
}

body {
  background: var(--page);
  min-height: 100vh;
  padding: 24px;
  color: var(--text);
  font-family: 'Manrope', sans-serif;
  line-height: 1.6;
}

a {
  color: var(--green-dark);
}

.container {
  max-width: 1180px;
  margin: 0 auto;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0 8px;
}

.site-brand {
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
}

.site-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.site-links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.site-links a:hover {
  color: var(--green-dark);
}

header {
  text-align: center;
  padding: 42px 0 34px;
  margin-bottom: 20px;
}

header h1,
.page-hero h1 {
  color: var(--text);
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.08;
  margin-bottom: 14px;
}

header h1 i {
  color: var(--green);
  font-size: 0.82em;
  margin-left: 8px;
}

header h2,
.page-hero p {
  max-width: 820px;
  margin: 0 auto;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 500;
  line-height: 1.65;
}

.main-intro {
  max-width: 840px;
  margin: 0 auto 34px;
  color: var(--muted);
  font-size: 1rem;
  text-align: center;
}

.main-content {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
}

.text-panel,
.control-panel,
.content-section,
.info-section,
.faq-section,
.localized-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 14px 34px rgba(29, 31, 37, 0.08);
}

.text-panel {
  flex: 1;
  min-width: 320px;
  padding: 28px;
}

.control-panel {
  width: 360px;
  padding: 28px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0;
}

.panel-title i {
  color: var(--green);
  font-size: 1rem;
}

textarea {
  width: 100%;
  height: 320px;
  margin-bottom: 10px;
  padding: 16px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--field);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  resize: vertical;
  transition: border-color 0.2s, background 0.2s;
}

textarea::placeholder {
  color: #777;
}

textarea:focus,
select:focus,
input:focus {
  outline: none;
  border-color: var(--ink);
  background: var(--field);
}

.char-count {
  margin-bottom: 18px;
  color: var(--soft);
  font-size: 0.825rem;
  font-weight: 500;
  text-align: right;
}

.char-count.warning {
  color: var(--error);
  font-weight: 600;
}

.tool-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 18px;
}

.secondary-btn,
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  background: var(--field);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s;
}

.secondary-btn:hover,
.download-btn:hover {
  background: #e4e7e7;
}

.file-input {
  display: none;
}

.form-group {
  margin-bottom: 24px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0;
}

select,
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  appearance: none;
  background: var(--field);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  transition: border-color 0.2s, background 0.2s;
}

.voice-list {
  max-height: 280px;
  margin-top: 8px;
  padding: 10px;
  overflow-y: auto;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--field);
}

.voice-list::-webkit-scrollbar,
.readalong-text::-webkit-scrollbar {
  width: 6px;
}

.voice-list::-webkit-scrollbar-track,
.readalong-text::-webkit-scrollbar-track {
  background: #e4e7e7;
}

.voice-list::-webkit-scrollbar-thumb,
.readalong-text::-webkit-scrollbar-thumb {
  background: var(--green);
  border-radius: 3px;
}

.voice-item {
  position: relative;
  margin-bottom: 8px;
  padding: 12px;
  border: 1px solid #d6dada;
  border-radius: 4px;
  background: var(--panel);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.voice-item:hover {
  background: #edf2f1;
  border-color: var(--green);
}

.voice-item.selected {
  background: var(--green);
  border-color: var(--green-dark);
  color: #fff;
}

.voice-item:last-child {
  margin-bottom: 0;
}

.voice-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.voice-info {
  flex: 1;
  min-width: 0;
}

.voice-name {
  margin-bottom: 2px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0;
}

.voice-gender {
  font-size: 0.82rem;
  font-weight: 500;
  opacity: 0.85;
}

.voice-controls {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
}

.preview-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 82px;
  padding: 7px 12px;
  border: none;
  border-radius: 24px;
  background: var(--ink);
  color: white;
  cursor: pointer;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  gap: 6px;
  transition: background 0.2s, opacity 0.2s;
}

.preview-btn:hover {
  background: #3a3729;
}

.preview-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.preview-btn.loading {
  background: var(--green);
}

.voice-item.selected .preview-btn {
  background: var(--page);
  color: #203130;
}

.voice-item.selected .preview-btn:hover {
  background: var(--field);
}

.convert-btn {
  width: 100%;
  margin-top: 8px;
  padding: 13px 24px;
  border: none;
  border-radius: 24px;
  background: var(--green);
  color: white;
  cursor: pointer;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0;
  transition: background 0.2s, opacity 0.2s;
}

.convert-btn:hover {
  background: var(--green-dark);
}

.convert-btn:disabled {
  background: var(--green);
  cursor: not-allowed;
  opacity: 0.4;
}

.player-container {
  display: none;
  margin-top: 24px;
  padding: 18px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: var(--field);
}

.player-container.active {
  display: block;
}

.player-container .panel-title {
  margin-bottom: 16px;
  font-size: 1rem;
}

.audio-player {
  width: 100%;
  height: 44px;
  margin-bottom: 14px;
  border-radius: 4px;
}

.playback-tools {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) auto auto;
  align-items: end;
  gap: 12px;
}

.playback-tools label {
  margin-bottom: 6px;
  font-size: 0.82rem;
}

.loop-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 0;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 600;
  user-select: none;
}

.loop-toggle input {
  width: auto;
  accent-color: var(--green);
}

.readalong-container {
  display: none;
  margin-top: 18px;
}

.readalong-container.active {
  display: block;
}

.readalong-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.readalong-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
}

.readalong-title i {
  color: var(--green);
}

.readalong-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 0;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  user-select: none;
}

.readalong-toggle input {
  width: auto;
  accent-color: var(--green);
}

.readalong-text {
  width: 100%;
  max-height: 260px;
  overflow-y: auto;
  padding: 16px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.9;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.readalong-text .read-word {
  padding: 1px 2px;
  border-radius: 3px;
  transition: background 0.12s ease, color 0.12s ease;
}

.readalong-text .read-word.active {
  background: var(--highlight);
  color: var(--text);
}

.readalong-text .read-word.spoken {
  color: #999;
}

.status {
  display: none;
  margin: 18px 0;
  padding: 14px 16px;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
}

.status.error {
  display: block;
  border: 1px solid #e3b4a7;
  background: #f9e6e0;
  color: var(--error);
}

.status.success {
  display: block;
  border: 1px solid #b7d9ac;
  background: #e6f3e1;
  color: var(--green-dark);
}

.status.loading {
  display: block;
  border: 1px solid #b9d2d7;
  background: var(--blue-soft);
  color: #203130;
}

.content-section,
.info-section,
.faq-section,
.localized-card {
  margin-top: 28px;
  padding: 28px;
}

.content-section:first-of-type {
  margin-top: 0;
}

.content-section h2,
.info-section h2,
.faq-section h2,
.localized-card h2 {
  margin-bottom: 12px;
  color: var(--text);
  font-size: 1.55rem;
  line-height: 1.3;
}

.content-section h3,
.info-section h3,
.faq-section h3,
.localized-card h3 {
  margin-bottom: 8px;
  color: var(--text);
  font-size: 1.05rem;
}

.content-section p,
.content-section li,
.info-section p,
.faq-section p,
.localized-card p,
.localized-card li {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.96rem;
}

.content-section ul,
.content-section ol,
.localized-card ul,
.localized-card ol {
  padding-left: 22px;
}

.info-grid,
.localized-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.info-card {
  padding: 18px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: var(--field);
}

.faq-item {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 24px;
  background: var(--green);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.primary-link:hover {
  background: var(--green-dark);
}

.tts-ext-promo {
  margin-top: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
}

.tts-ext-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
}

.tts-ext-body {
  flex: 1;
  min-width: 0;
}

.tts-ext-badge {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  border-radius: 3px;
  background: var(--blue-soft);
  color: var(--text);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.tts-ext-body h3 {
  margin-bottom: 8px;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
}

.tts-ext-features {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tts-ext-features span {
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--field);
  color: var(--text);
  font-size: 11px;
  font-weight: 500;
}

.tts-ext-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 22px;
  border: 1px solid #203130;
  border-radius: 50px;
  background: #b0ec9c;
  box-shadow: 4px 4px 0 rgb(0, 0, 0);
  color: #203130;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s;
}

.tts-ext-cta:hover {
  background: #9ddf8b;
}

.tts-ext-rating {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
}

.tts-ext-rating svg {
  width: 14px;
  height: 14px;
  fill: #F5A623;
}

.tts-ext-rating span {
  color: var(--muted);
  font-size: 12px;
}

.language-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 24px 0 0;
}

.language-list a {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
}

.language-list a:hover {
  color: var(--green-dark);
  border-color: var(--green);
}

footer {
  margin-top: 28px;
  padding: 42px 0 20px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 10px;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--green-dark);
}

@media (max-width: 768px) {
  body {
    padding: 16px;
  }

  .site-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-links {
    justify-content: flex-start;
  }

  header {
    padding: 30px 0 28px;
    margin-bottom: 18px;
  }

  .main-content {
    flex-direction: column;
    gap: 20px;
  }

  .control-panel {
    width: 100%;
  }

  .text-panel,
  .control-panel,
  .content-section,
  .info-section,
  .faq-section,
  .localized-card {
    padding: 22px;
  }

  .voice-content {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .voice-controls {
    align-self: flex-end;
  }

  .voice-list {
    max-height: 240px;
  }

  textarea {
    height: 280px;
  }

  .panel-title {
    margin-bottom: 18px;
    font-size: 1.15rem;
  }

  .info-grid,
  .localized-grid {
    grid-template-columns: 1fr;
  }

  .tool-actions,
  .playback-tools {
    grid-template-columns: 1fr;
  }

  .readalong-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .tts-ext-inner {
    flex-direction: column;
    text-align: center;
  }

  .tts-ext-features {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  body {
    padding: 12px;
  }

  .text-panel,
  .control-panel,
  .content-section,
  .info-section,
  .faq-section,
  .localized-card {
    padding: 18px;
  }

  .preview-btn {
    min-width: 76px;
    padding: 6px 10px;
    font-size: 0.78rem;
  }
}