.utm-builder-page {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #5d6b82;
  --line: #dbe3ef;
  --primary: #1d4ed8;
  --primary-soft: #dbeafe;
  --success: #166534;
  --success-bg: #dcfce7;
  --warning: #9a6700;
  --warning-bg: #fef3c7;
  --error: #b91c1c;
  --error-bg: #fee2e2;
  --shadow: 0 18px 40px rgba(17, 24, 39, 0.08);
  --radius: 18px;
  background: var(--bg);
  color: var(--text);
}

.utm-builder-page * {
  box-sizing: border-box;
}

.utm-builder-page .page-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px;
}

.utm-builder-page .hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.utm-builder-page .hero-main {
  flex: 1 1 auto;
}

.utm-builder-page .eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 12px;
}

.utm-builder-page h1,
.utm-builder-page h2 {
  margin: 0 0 12px;
}

.utm-builder-page h1 {
  font-size: 38px;
  line-height: 1.1;
}

.utm-builder-page h2 {
  font-size: 22px;
}

.utm-builder-page .hero-copy,
.utm-builder-page .section-copy {
  color: var(--muted);
  line-height: 1.6;
  max-width: 760px;
}

.utm-builder-page .hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.utm-builder-page .hero-badges span {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 14px;
  box-shadow: var(--shadow);
}

.utm-builder-page .grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
}

.utm-builder-page .card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.utm-builder-page .toolbar {
  display: inline-flex;
  gap: 8px;
  background: #edf2fb;
  border-radius: 999px;
  padding: 6px;
  margin-bottom: 20px;
}

.utm-builder-page .mode-btn,
.utm-builder-page .btn-primary,
.utm-builder-page .btn-secondary,
.utm-builder-page .btn-tertiary {
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.15s ease;
}

.utm-builder-page .mode-btn {
  padding: 10px 16px;
  background: transparent;
  color: var(--muted);
}

.utm-builder-page .mode-btn.active {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 2px 8px rgba(17, 24, 39, 0.08);
}

.utm-builder-page .utm-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.utm-builder-page .field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.utm-builder-page .full-width {
  grid-column: 1 / -1;
}

.utm-builder-page label {
  font-weight: 600;
}

.utm-builder-page .required {
  color: var(--error);
}

.utm-builder-page input,
.utm-builder-page textarea,
.utm-builder-page pre {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  font: inherit;
  background: #fff;
  color: var(--text);
}

.utm-builder-page input:focus,
.utm-builder-page textarea:focus {
  outline: 3px solid var(--primary-soft);
  border-color: var(--primary);
}

.utm-builder-page small {
  color: var(--muted);
  line-height: 1.5;
}

.utm-builder-page .advanced-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 8px;
}

.utm-builder-page .advanced-fields h2,
.utm-builder-page .advanced-fields p {
  grid-column: 1 / -1;
}

.utm-builder-page .is-hidden {
  display: none;
}

.utm-builder-page .actions {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-top: 8px;
}

.utm-builder-page .btn-primary,
.utm-builder-page .btn-secondary,
.utm-builder-page .btn-tertiary {
  padding: 12px 18px;
}

.utm-builder-page .btn-primary {
  background: var(--primary);
  color: #fff;
}

.utm-builder-page .btn-secondary {
  background: #0f172a;
  color: #fff;
}

.utm-builder-page .btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.utm-builder-page .btn-tertiary {
  background: #eef2ff;
  color: var(--text);
}

.utm-builder-page .output-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.utm-builder-page .status-box {
  border-radius: 14px;
  padding: 14px 16px;
  line-height: 1.6;
  border: 1px solid transparent;
}

.utm-builder-page .status-box.muted {
  background: #f8fafc;
  color: var(--muted);
  border-color: var(--line);
}

.utm-builder-page .status-box.success {
  background: var(--success-bg);
  color: var(--success);
  border-color: #86efac;
}

.utm-builder-page .status-box.warning {
  background: var(--warning-bg);
  color: var(--warning);
  border-color: #fde68a;
}

.utm-builder-page .status-box.error {
  background: var(--error-bg);
  color: var(--error);
  border-color: #fecaca;
}

.utm-builder-page .output-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.utm-builder-page .output-block label {
  font-size: 14px;
}

.utm-builder-page pre {
  min-height: 180px;
  white-space: pre-wrap;
  word-break: break-word;
  background: #0f172a;
  color: #e2e8f0;
}

.utm-builder-page textarea[readonly] {
  background: #f8fafc;
}

.utm-builder-page .meta-row {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
}

.utm-builder-page .toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #111827;
  color: #fff;
  padding: 12px 18px;
  border-radius: 8px;
  opacity: 0;
  transform: translateY(20px);
  transition: all .3s ease;
  font-size: 14px;
  z-index: 9999;
}

.utm-builder-page .toast.show {
  opacity: 1;
  transform: translateY(0);
}

.utm-builder-page button:hover,
.utm-builder-page .btn-primary:hover,
.utm-builder-page .btn-secondary:hover,
.utm-builder-page .btn-tertiary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.utm-builder-page button:active,
.utm-builder-page .btn-primary:active,
.utm-builder-page .btn-secondary:active,
.utm-builder-page .btn-tertiary:active {
  transform: translateY(1px) scale(0.97);
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

@media (max-width: 960px) {
  .utm-builder-page .grid {
    grid-template-columns: 1fr;
  }

  .utm-builder-page .hero {
    flex-direction: column;
  }

  .utm-builder-page .hero-badges {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .utm-builder-page .page-shell {
    padding: 16px;
  }

  .utm-builder-page .utm-form,
  .utm-builder-page .advanced-fields {
    grid-template-columns: 1fr;
  }

  .utm-builder-page h1 {
    font-size: 30px;
  }

  .utm-builder-page .actions {
    flex-wrap: wrap;
  }
}