/* Stage 30: mobile layout hardening. Desktop styles intentionally untouched. */
@media (max-width: 700px) {
  html,
  body {
    max-width: 100%;
    overflow-x: hidden;
  }

  .container {
    width: min(calc(100% - 24px), var(--container));
  }

  .page-hero,
  .page-hero.compact {
    padding: 36px 0 28px;
  }

  .page-hero h1,
  .page-hero.compact h1 {
    font-size: clamp(30px, 9vw, 40px);
    line-height: 1.06;
    letter-spacing: -.045em;
    overflow-wrap: anywhere;
  }

  .hero h1 {
    font-size: clamp(38px, 12vw, 48px);
    line-height: 1;
  }

  .hero-lead {
    font-size: 16px;
    line-height: 1.55;
  }

  .breadcrumbs {
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    white-space: nowrap;
    padding-bottom: 5px;
    margin-right: -12px;
    scrollbar-width: none;
  }

  .breadcrumbs::-webkit-scrollbar {
    display: none;
  }

  .section {
    padding: 42px 0;
  }

  .top-tight {
    padding-top: 22px;
  }

  .section h2 {
    font-size: 28px;
    line-height: 1.12;
    overflow-wrap: anywhere;
  }

  .calculator-layout,
  .article-layout {
    gap: 14px;
  }

  .calc-panel,
  .result-panel,
  .content-card,
  .sticky-card {
    min-width: 0;
    padding: 18px 16px;
    border-radius: 18px;
  }

  .form-head {
    align-items: flex-start;
    margin-bottom: 20px;
  }

  .form-head h2 {
    font-size: 22px;
    line-height: 1.15;
  }

  .form-head p {
    line-height: 1.4;
  }

  .step-dot {
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
  }

  .field-grid,
  .field-grid.three,
  .radio-cards {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .field {
    min-width: 0;
    margin-bottom: 16px;
  }

  .field-label {
    line-height: 1.35;
  }

  input,
  select {
    min-width: 0;
    padding: 12px;
    font-size: 16px;
  }

  .input-unit {
    min-width: 0;
  }

  .input-unit input {
    min-width: 0;
    padding-left: 12px;
    padding-right: 8px;
  }

  .input-unit span {
    flex: 0 0 auto;
    padding: 0 10px;
    font-size: 12px;
  }

  .radio-cards span {
    padding: 12px;
  }

  .calc-disclaimer {
    padding: 12px;
    line-height: 1.5;
  }

  .result-panel {
    margin-top: 0;
  }

  .result-price {
    font-size: 34px;
    line-height: 1.08;
    overflow-wrap: anywhere;
  }

  .result-per {
    font-size: 14px;
    line-height: 1.4;
    overflow-wrap: anywhere;
  }

  .result-breakdown {
    margin: 18px 0;
  }

  .result-breakdown > div {
    align-items: flex-start;
    gap: 8px;
  }

  .result-breakdown span,
  .result-breakdown strong {
    min-width: 0;
    overflow-wrap: anywhere;
  }

  .result-breakdown strong {
    max-width: 60%;
    text-align: right;
  }

  #stage30AcClassRow strong {
    max-width: 64%;
  }

  .copy-result {
    min-height: 46px;
    font-size: 16px;
  }

  .result-small {
    line-height: 1.5;
  }

  .explainer p,
  .seo-copy {
    font-size: 15px;
    line-height: 1.65;
  }

  .formula-box {
    padding: 15px;
    margin: 18px 0;
    overflow-wrap: anywhere;
  }

  .faq {
    margin-top: 32px;
  }

  .faq h2 {
    font-size: 26px;
  }

  .faq summary {
    line-height: 1.4;
  }

  .seo-summary {
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;
    max-width: 100%;
  }

  .seo-summary strong,
  .seo-summary span,
  .seo-copy,
  .seo-copy p,
  .seo-copy a {
    overflow-wrap: anywhere;
  }

  .seo-hub-nav,
  .seo-theme-nav,
  .seo-primary-links,
  .seo-cluster-links {
    max-width: 100%;
  }

  .seo-hub-nav a,
  .seo-theme-nav a,
  .seo-primary-links a,
  .seo-cluster-links a {
    min-width: 0;
    overflow-wrap: anywhere;
  }

  .tool-grid,
  .tool-grid.large,
  .category-cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .tool-card {
    min-height: 0;
    padding: 18px;
  }

  .tool-card h3 {
    font-size: 21px;
    overflow-wrap: anywhere;
  }

  .price-guide-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }

  .price-guide-card > strong {
    font-size: 30px;
    overflow-wrap: anywhere;
  }

  .stat-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 420px) {
  .container {
    width: min(calc(100% - 20px), var(--container));
  }

  .calc-panel,
  .result-panel,
  .content-card,
  .sticky-card {
    padding: 16px 13px;
  }

  .result-breakdown > div {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 3px;
  }

  .result-breakdown strong,
  #stage30AcClassRow strong {
    max-width: none;
    text-align: left;
  }

  .search-box {
    padding: 6px;
  }

  .hero-card {
    padding: 18px;
  }
}