:root {
  color-scheme: dark;
  --ui-text: #edf4fb;
  --ui-text-secondary: #c4d2e1;
  --ui-text-muted: #aabbd0;
  --ui-focus: #facc15;
  --ui-surface: rgba(13, 25, 43, 0.96);
  --ui-border: rgba(125, 211, 252, 0.34);
}

body {
  color: var(--ui-text);
  font-size: 16px;
  line-height: 1.6;
}

.subtitle,
.var-desc,
.var-node-desc,
.guide-item p,
.code-tutorial p,
.code-tutorial ol,
.tutorial-step p,
.cat-section-title,
.analysis-content,
.var-empty,
.var-children-count,
.cat-tab,
.examples > span,
.site-footer {
  color: var(--ui-text-secondary) !important;
}

.var-desc,
.var-node-desc,
.cat-section-title,
.site-footer,
.code-tutorial > p:last-child {
  font-size: 0.875rem !important;
}

.text-input::placeholder {
  color: #8eddec;
  opacity: 0.78;
}

.site-footer a {
  color: #67e8f9 !important;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.clip-indicator {
  color: var(--ui-text-muted) !important;
}

button,
a,
input,
select,
summary,
[tabindex]:not([tabindex='-1']) {
  -webkit-tap-highlight-color: transparent;
}

:where(button, a, input, select, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--ui-focus) !important;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(250, 204, 21, 0.2) !important;
}

.btn,
.btn-help,
.advanced-link,
.cat-tab,
.cat-preset-btn,
.example-btn,
.btn-var-clear,
.var-node-play,
.var-btn,
.btn-tutorial {
  min-height: 44px;
}

.btn-help,
.advanced-link,
.cat-tab,
.cat-preset-btn,
.example-btn,
.btn-var-clear,
.var-node-play,
.var-btn,
.btn-tutorial {
  font-family: inherit;
}

.ui-icon {
  width: 1.1em;
  height: 1.1em;
  flex: 0 0 auto;
  filter: brightness(0) saturate(100%) invert(94%) sepia(12%) saturate(428%) hue-rotate(173deg)
    brightness(104%);
  pointer-events: none;
}

h1 .ui-icon,
.panel-heading .ui-icon,
.advanced-link .ui-icon {
  width: 1.2em;
  height: 1.2em;
}

.panel-heading,
.heading-with-icon {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.top-links,
.advanced-link,
.btn-help,
.btn,
.cat-tab {
  align-items: center;
}

.advanced-link,
.btn-help,
.cat-tab {
  display: inline-flex;
  gap: 0.45rem;
  justify-content: center;
}

.cat-tab[aria-selected='true'] {
  color: #f4fbff;
  border-color: #67e8f9;
}

.tutorial-overlay {
  padding: 20px;
}

.tutorial-box {
  position: relative;
  width: min(560px, 100%);
  max-height: min(680px, calc(100vh - 40px));
  overflow: auto;
  background: var(--ui-surface);
  border-color: var(--ui-border);
}

.tutorial-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.tutorial-header h2 {
  margin: 0;
}

.tutorial-description {
  color: var(--ui-text-secondary);
  margin-bottom: 16px;
}

.tutorial-progress {
  height: 6px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.11);
  margin-bottom: 8px;
}

.tutorial-progress-bar {
  height: 100%;
  width: 25%;
  border-radius: inherit;
  background: linear-gradient(90deg, #22d3ee, #34d399);
  transition: width 180ms ease;
}

.tutorial-step-counter {
  color: var(--ui-text-muted);
  font-size: 0.875rem;
  margin-bottom: 12px;
}

.tutorial-step {
  min-height: 180px;
  padding: 18px;
  border-color: rgba(125, 211, 252, 0.28);
}

.tutorial-step[hidden] {
  display: none;
}

.tutorial-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
}

.tutorial-nav-primary {
  display: flex;
  gap: 10px;
  margin-left: auto;
}

.btn-tutorial {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 10px 16px;
  border: 1px solid var(--ui-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--ui-text);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
}

.btn-tutorial-primary {
  background: linear-gradient(135deg, #0891b2, #047857);
  border-color: #67e8f9;
  color: #fff;
}

.btn-tutorial-skip {
  min-width: 44px;
  padding-inline: 12px;
  color: var(--ui-text-secondary);
}

body.dialog-open {
  overflow: hidden;
}

@media (max-width: 700px) {
  body {
    padding: 16px 12px 32px;
  }

  header h1 {
    font-size: clamp(1.45rem, 7vw, 2rem);
    line-height: 1.25;
  }

  .subtitle {
    margin-bottom: 18px;
    font-size: 0.9rem;
  }

  .top-links {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .advanced-link,
  .btn-help {
    width: 100%;
  }

  .panel {
    padding: 18px 14px;
    border-radius: 14px;
  }

  .input-area {
    display: grid;
    grid-template-columns: 1fr;
  }

  .text-input {
    width: 100%;
    min-width: 0;
    font-size: clamp(1.35rem, 8vw, 1.8rem);
  }

  .playback-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .playback-buttons .btn {
    width: 100%;
    min-width: 0;
    padding-inline: 12px;
  }

  .category-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .audio-monitor {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .tutorial-overlay {
    align-items: flex-end;
    padding: 10px;
  }

  .tutorial-box {
    max-height: calc(100dvh - 20px);
    padding: 20px 16px;
  }

  .tutorial-step {
    min-height: 160px;
  }
}

@media (max-width: 430px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

  .tutorial-nav {
    align-items: stretch;
    flex-direction: column;
  }

  .tutorial-nav-primary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    margin-left: 0;
  }

  .tutorial-nav > .btn-tutorial,
  .tutorial-nav-primary .btn-tutorial {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  body {
    animation: none !important;
    background-position: 50% 50%;
  }

  h1,
  .panel,
  .btn-play::after {
    animation: none !important;
  }
}

.usage-license-main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
  align-items: center;
  margin-top: 14px;
  padding: 11px 13px;
  border: 1px solid rgba(52, 211, 153, 0.45);
  border-radius: 10px;
  background: rgba(16, 185, 129, 0.08);
  color: #d1fae5;
  font-size: 0.82rem;
}

.usage-license-main span {
  color: #a7c9c0;
}
.usage-license-main a {
  grid-column: 2;
  grid-row: 1 / 3;
  color: #67e8f9;
  font-weight: 700;
}

@media (max-width: 620px) {
  .usage-license-main {
    grid-template-columns: 1fr;
  }
  .usage-license-main a {
    grid-column: auto;
    grid-row: auto;
  }
}

.install-button[hidden],
.pwa-install-hint[hidden] {
  display: none;
}

.pwa-install-hint {
  max-width: 720px;
  margin: 10px auto 18px;
  padding: 9px 12px;
  border: 1px solid rgba(103, 232, 249, 0.32);
  border-radius: 9px;
  background: rgba(6, 182, 212, 0.07);
  color: #bfeef7;
  font-size: 0.82rem;
  text-align: center;
}

.seo-faq-lead {
  margin: 4px 0 14px;
  color: #a9bfd3;
}

.seo-faq-item {
  margin-top: 8px;
  border: 1px solid rgba(103, 232, 249, 0.16);
  border-radius: 10px;
  background: rgba(4, 14, 28, 0.42);
  overflow: clip;
}

.seo-faq-question {
  padding: 13px 15px;
  color: #d9f7ff;
  cursor: pointer;
  font-weight: 700;
}

.seo-faq-answer {
  padding: 0 15px 14px;
  color: #b7cbdc;
  line-height: 1.75;
}