* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hi);
}

button,
input,
select,
textarea {
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tool-intro {
  max-width: 760px;
  padding: 46px 0 28px;
}

.eyebrow {
  margin-bottom: 13px;
  color: var(--warm);
  font: 500 12px/1 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.tool-intro h1 {
  max-width: 700px;
  margin: 0;
  color: var(--text);
  font: 500 clamp(36px, 6vw, 54px)/1.06 var(--disp);
  letter-spacing: 0;
}

.tool-intro p {
  max-width: 62ch;
  margin: 18px 0 0;
  color: #C9CED6;
  font-size: 17px;
}

.builder-shell {
  display: grid;
  grid-template-columns: minmax(290px, .82fr) minmax(0, 1.18fr);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.control-pane,
.output-pane {
  min-width: 0;
}

.control-pane {
  padding: 24px;
  border-right: 1px solid var(--border);
}

.pane-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.pane-head h2,
.result-head h2 {
  margin: 0;
  font: 600 19px/1.25 var(--disp);
  letter-spacing: 0;
}

.pane-head span,
.result-head span,
.quote {
  color: var(--dim);
  font: 500 11px/1.4 var(--mono);
}

.presets {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 18px;
}

.preset,
.tool-btn {
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--muted);
  cursor: pointer;
}

.preset {
  padding: 8px 6px;
  font: 500 12px/1 var(--sans);
}

.preset:hover,
.preset[aria-pressed="true"] {
  border-color: var(--accent-dim);
  color: var(--text);
}

.field {
  display: block;
  margin-bottom: 15px;
}

.field > span,
.toggle-label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font: 500 11px/1 var(--mono);
  text-transform: uppercase;
}

.field textarea,
.field select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #111317;
  color: var(--text);
}

.field textarea {
  min-height: 112px;
  resize: vertical;
  padding: 12px;
  line-height: 1.5;
}

.field select {
  min-height: 44px;
  padding: 0 11px;
}

.setting-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 10px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  margin: 2px 0 18px;
  color: var(--text);
  font-size: 14px;
}

.toggle-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.build-btn {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #06231F;
  font-weight: 600;
  cursor: pointer;
}

.build-btn:hover {
  border-color: var(--accent-hi);
  background: var(--accent-hi);
}

.preview {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #0D0F12;
}

.preview video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-label {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 5px;
  background: rgba(10, 11, 13, .76);
  color: #E8EAED;
  font: 500 11px/1 var(--mono);
}

.result {
  padding: 22px 24px 24px;
}

.result-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

#resultPrompt {
  width: 100%;
  min-height: 230px;
  resize: vertical;
  padding: 14px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  background: #111317;
  color: #DDE1E6;
  font: 400 13px/1.65 var(--mono);
}

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 10px;
  color: var(--dim);
  font: 500 11px/1.4 var(--mono);
}

.quote {
  color: var(--accent);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 18px;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  color: var(--text);
  font-weight: 600;
}

.tool-btn.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #06231F;
}

.tool-btn:hover {
  border-color: var(--dim);
  color: var(--text);
}

.tool-btn.primary:hover {
  border-color: var(--accent-hi);
  background: var(--accent-hi);
  color: #06231F;
}

.method {
  padding: 64px 0 26px;
}

.method h2,
.faq-section h2 {
  max-width: 700px;
  margin: 0 0 24px;
  font: 600 clamp(27px, 4vw, 34px)/1.18 var(--disp);
  letter-spacing: 0;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.method-grid article {
  padding: 22px 22px 24px 0;
}

.method-grid article + article {
  padding-left: 22px;
  border-left: 1px solid var(--border);
}

.method-grid strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font: 600 16px/1.3 var(--sans);
}

.method-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.faq-section {
  padding: 52px 0 18px;
}

.faq {
  display: grid;
  gap: 8px;
  max-width: 780px;
}

.faq details {
  padding: 0 17px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
}

.faq summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 0;
  color: var(--text);
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  color: var(--accent);
  font-family: var(--mono);
}

.faq details[open] summary::after {
  content: "-";
}

.faq p {
  max-width: 66ch;
  margin: 0;
  padding: 0 0 16px;
  color: var(--muted);
  font-size: 14.5px;
}

footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 42px;
  padding: 26px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 13px;
}

footer .links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--muted);
}

@media (max-width: 780px) {
  .builder-shell {
    grid-template-columns: 1fr;
  }

  .control-pane {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .method-grid {
    grid-template-columns: 1fr;
  }

  .method-grid article,
  .method-grid article + article {
    padding: 18px 0;
    border-left: 0;
  }

  .method-grid article + article {
    border-top: 1px solid var(--border);
  }
}

@media (max-width: 480px) {
  .tool-intro {
    padding-top: 36px;
  }

  .control-pane,
  .result {
    padding: 18px;
  }

  .presets {
    grid-template-columns: 1fr 1fr;
  }

  .setting-grid {
    grid-template-columns: 1fr;
  }

  .result-actions .tool-btn {
    flex: 1 1 140px;
  }
}

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