:root {
  --bg: #f8fafc;
  --bg-soft: #f1f5f9;
  --panel: rgba(255, 255, 255, 0.96);
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --ink: #0f172a;
  --muted: #64748b;
  --accent-ui: #0f172a;
  --radius-xl: 14px;
  --radius-lg: 10px;
  --radius-md: 8px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 10px 30px rgba(15, 23, 42, 0.05);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: "Inter", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  padding: 1rem;
}

.app-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(to right, rgba(15, 23, 42, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.25), transparent 90%);
}

.workspace {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(340px, 440px);
  gap: 0.75rem;
  min-height: calc(100vh - 2rem);
  max-width: 1520px;
  margin: 0 auto;
}

.noscript-banner {
  max-width: 1520px;
  margin: 1rem auto 0;
  padding: 0.9rem 1rem;
  border: 1px solid #fecaca;
  border-radius: var(--radius-lg);
  background: #fff1f2;
  color: #881337;
  font-size: 0.9rem;
}

.preview-panel,
.control-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.preview-panel {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0.8rem;
  padding: 1rem;
}

.controls-panel {
  display: grid;
  gap: 0.7rem;
}

.control-block {
  padding: 0.85rem;
}

.ad-panel {
  overflow: hidden;
}

.panel-head,
.group-head,
.field-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.75rem;
}

.section-head {
  margin-bottom: 0.7rem;
}

.section-head h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section-head p {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.panel-head h1 {
  margin: 0;
  max-width: 16ch;
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  letter-spacing: -0.04em;
  line-height: 1;
}

.panel-description {
  margin: 0.4rem 0 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.status-badge {
  align-self: start;
  min-height: 28px;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  white-space: nowrap;
}

.preview-stage {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  min-height: 50vh;
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.preview-stage:hover,
.preview-stage:focus-visible,
.preview-stage.is-dragging {
  border-color: var(--accent-ui);
  background: #ffffff;
  transform: translateY(-1px);
}

.preview-stage:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 3px rgba(232, 111, 44, 0.16);
}

#preview-canvas {
  display: block;
  max-width: min(100%, 980px);
  max-height: 62vh;
  width: auto;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}

.empty-state {
  position: absolute;
  display: grid;
  gap: 0.6rem;
  place-items: center;
  text-align: center;
  padding: 1rem;
  z-index: 1;
}

.empty-state[hidden] {
  display: none !important;
}

.empty-state p {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 500;
}

.empty-state span {
  color: var(--muted);
  font-size: 0.78rem;
}

.meta-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
}

.meta-strip div {
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.meta-strip span,
.field > span,
.field-head span,
.group-head span,
.dropzone-label {
  display: block;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
}

.meta-strip strong {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.dropzone {
  display: grid;
  place-items: center;
  gap: 0.35rem;
  min-height: 8.5rem;
  padding: 0.95rem;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--line-strong);
  background: var(--bg-soft);
  text-align: center;
  cursor: pointer;
  transition: border-color 180ms ease, transform 180ms ease, background 180ms ease;
}

.dropzone strong {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.dropzone-note {
  color: var(--muted);
  font-size: 0.76rem;
}

.dropzone.is-dragging {
  transform: translateY(-1px);
  border-color: var(--accent-ui);
  background: #ffffff;
}

.button,
.segment,
.swatch-chip,
.text-button,
.file-item {
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease, transform 180ms ease;
}

.button {
  appearance: none;
  min-height: 34px;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.button:hover,
.button:focus-visible,
.segment:hover,
.segment:focus-visible,
.swatch-chip:hover,
.swatch-chip:focus-visible,
.text-button:hover,
.text-button:focus-visible,
.file-item:hover,
.file-item:focus-visible {
  transform: translateY(-1px);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.button-secondary,
.text-button {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.7rem;
}

.seo-block {
  position: relative;
  z-index: 1;
  max-width: 1520px;
  margin: 0.75rem auto 0;
}

.seo-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 0.95rem;
}

.seo-card h2,
.seo-copy h3 {
  margin: 0;
  letter-spacing: -0.02em;
}

.seo-card h2 {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}

.seo-card p {
  margin: 0.6rem 0 0;
  max-width: 90ch;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.seo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.seo-copy {
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-soft);
}

.seo-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.seo-note {
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-soft);
}

.seo-note h3 {
  margin: 0;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.seo-note p {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.seo-note a {
  color: var(--ink);
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.16em;
}

.seo-list {
  margin: 0.6rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.55;
}

.faq-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.faq-list details {
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.faq-list summary {
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 600;
  list-style: none;
}

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

.faq-list details p {
  margin: 0.45rem 0 0;
  font-size: 0.82rem;
}

.export-button {
  flex: 1 1 0;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.field-grid.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field-head strong {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
}

.field input[type="number"],
.field input[type="text"],
.field select,
.quality-readout {
  width: 100%;
  min-height: 34px;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font-size: 0.82rem;
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--ink);
}

.quality-readout {
  display: grid;
  place-items: center;
  font-weight: 600;
}

.color-input-row {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 0.5rem;
}

input[type="color"] {
  width: 46px;
  height: 34px;
  padding: 2px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #ffffff;
  appearance: none;
  -webkit-appearance: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 0;
  border-radius: calc(var(--radius-md) - 3px);
}

input[type="color"]::-moz-color-swatch {
  border: 0;
  border-radius: calc(var(--radius-md) - 3px);
}

.toggle-field {
  align-content: end;
}

.switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 40px;
  height: 22px;
}

.switch input {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.switch span {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #e2e8f0;
}

.switch span::after {
  content: "";
  position: absolute;
  top: 1px;
  left: 1px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.15);
  transition: transform 180ms ease;
}

.switch input:checked + span {
  background: var(--ink);
}

.switch input:checked + span::after {
  transform: translateX(18px);
}

.palette-group + .palette-group {
  margin-top: 0.75rem;
}

.group-head {
  margin-bottom: 0.55rem;
}

.text-button {
  appearance: none;
  min-height: 28px;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-md);
  font-size: 0.76rem;
  cursor: pointer;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.swatch-chip {
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-strong);
  cursor: pointer;
}

.segmented {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
}

.segmented-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.segment {
  appearance: none;
  min-height: 34px;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.segment.is-active {
  border-color: var(--ink);
  background: var(--ink);
  color: #ffffff;
}

.file-list {
  display: grid;
  gap: 0.4rem;
  margin-top: 0.7rem;
}

.file-item,
.file-empty {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.55rem;
  align-items: center;
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.file-item {
  appearance: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.file-item.is-active {
  border-color: var(--ink);
  background: #ffffff;
}

.file-item strong,
.file-empty strong {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
}

.file-item span,
.file-empty span {
  color: var(--muted);
  font-size: 0.72rem;
}

.file-empty {
  grid-template-columns: 1fr;
}

.ad-slot {
  min-height: 148px;
}

#carbonads {
  display: grid;
  gap: 0.7rem;
  color: var(--muted);
  font-size: 0.78rem;
}

#carbonads a {
  color: inherit;
  text-decoration: none;
}

#carbonads .carbon-wrap {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 0.75rem;
  align-items: start;
}

#carbonads .carbon-img {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

#carbonads .carbon-img img {
  display: block;
  width: 100%;
  height: auto;
}

#carbonads .carbon-text {
  display: block;
  line-height: 1.5;
}

#carbonads .carbon-poweredby {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .preview-stage {
    min-height: 44vh;
  }
}

@media (max-width: 760px) {
  .app-shell {
    padding: 0.7rem;
  }

  .panel-head,
  .group-head,
  .field-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .meta-strip,
  .field-grid,
  .field-grid.three-up,
  .seo-grid,
  .seo-notes {
    grid-template-columns: 1fr;
  }

  .button-row {
    flex-direction: column;
  }

  .export-button {
    width: 100%;
  }

  #preview-canvas {
    max-height: 46vh;
  }

  #carbonads .carbon-wrap {
    grid-template-columns: 1fr;
  }
}