/* =========================================================================
   M-Convert · responsive.css
   -------------------------------------------------------------------------
   Purpose : Media-query-only refinements that must load last so they can
             override the earlier cascade where necessary. Consolidates
             every breakpoint in a single audit-friendly file.
   Order   : Sixth and final stylesheet.
   Breakpoints in use across the whole project:
     320  base (mobile-first — no query needed)
     360  minor mobile tuning
     390  larger mobile tuning
     480  small landscape / larger phones
     560  cards start to pair up
     640  small tablets, container padding grows
     768  tablets
     900  nav switches to desktop, three-column grids
     1024 laptop
     1280 desktop container widens
     1440 large desktop
   ========================================================================= */

/* -------------------------------------------------------------------------
   1. SMALL MOBILE (≤ 359 px) — very narrow devices
   ------------------------------------------------------------------------- */
@media (max-width: 359px) {
  :root {
    --container-px: var(--sp-3);
  }

  h1, .hero__title, .tool-page__title {
    font-size: 1.75rem;
  }

  h2, .section__title {
    font-size: 1.375rem;
  }

  .converter__input,
  .converter__result-value {
    font-size: 1.125rem;
  }

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

  .site-nav__list {
    gap: 0;
  }

  .brand__name {
    font-size: var(--fs-sm);
  }

  .brand__icon {
    width: 28px;
    height: 28px;
  }
}

/* -------------------------------------------------------------------------
   2. MOBILE LANDSCAPE (short viewport) — tighten vertical rhythm
   ------------------------------------------------------------------------- */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding-block: var(--sp-6) var(--sp-5);
  }

  .hero__eyebrow {
    margin-bottom: var(--sp-3);
  }

  .hero__search {
    margin-top: var(--sp-5);
  }

  .section {
    padding-block: var(--sp-8);
  }

  .site-header__inner {
    min-height: 56px;
  }
}

/* -------------------------------------------------------------------------
   3. LARGER PHONES (≥ 390 px)
   ------------------------------------------------------------------------- */
@media (min-width: 390px) {
  .hero__title {
    letter-spacing: -0.015em;
  }

  .tool-card {
    padding: var(--sp-5);
  }
}

/* -------------------------------------------------------------------------
   4. PHONE LANDSCAPE / SMALL TABLETS (≥ 480 px)
   ------------------------------------------------------------------------- */
@media (min-width: 480px) {
  .converter__actions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .breadcrumbs {
    font-size: var(--fs-sm);
  }

  .alert {
    padding: var(--sp-4) var(--sp-5);
  }

  .faq__summary {
    padding: var(--sp-4) var(--sp-5);
  }
}

/* -------------------------------------------------------------------------
   5. LARGER PHONES / SMALL TABLETS (≥ 560 px)
   ------------------------------------------------------------------------- */
@media (min-width: 560px) {
  .hero__lede {
    font-size: var(--fs-lg);
  }

  .popular-table .data-table {
    font-size: var(--fs-sm);
  }

  .tool-page__header {
    margin-bottom: var(--sp-8);
  }

  .stat-row {
    gap: var(--sp-5);
  }
}

/* -------------------------------------------------------------------------
   6. TABLETS (≥ 640 px)
   ------------------------------------------------------------------------- */
@media (min-width: 640px) {
  body {
    font-size: var(--fs-md);
  }

  .hero {
    padding-block: var(--sp-14) var(--sp-12);
  }

  .hero__eyebrow {
    font-size: var(--fs-xs);
  }

  .converter {
    padding: var(--sp-6);
  }

  .formula-block {
    padding: var(--sp-6);
  }

  .example-block {
    padding: var(--sp-6);
  }

  .faq__answer {
    padding-inline: var(--sp-6);
    padding-bottom: var(--sp-6);
  }

  .section__head {
    margin-bottom: var(--sp-10);
  }

  .related-tools__list {
    gap: var(--sp-4);
  }

  .data-table thead th {
    font-size: var(--fs-xs);
  }

  .data-table th,
  .data-table td {
    padding: var(--sp-3) var(--sp-4);
  }
}

/* -------------------------------------------------------------------------
   7. TABLETS LANDSCAPE / SMALL LAPTOPS (≥ 768 px)
   ------------------------------------------------------------------------- */
@media (min-width: 768px) {
  :root {
    --header-h: 68px;
  }

  .site-header__inner {
    gap: var(--sp-6);
  }

  .hero__title {
    font-size: var(--fs-4xl);
  }

  .hero__lede {
    font-size: var(--fs-md);
  }

  .tool-page__title {
    font-size: var(--fs-3xl);
  }

  .tool-page__lede {
    font-size: var(--fs-lg);
  }

  .converter {
    padding: var(--sp-8);
  }

  .converter__input,
  .converter__result-box {
    height: 64px;
    min-height: 64px;
  }

  .section {
    padding-block: var(--sp-16);
  }

  .section--muted {
    padding-block: var(--sp-16);
  }

  .site-footer {
    padding-block: var(--sp-16) var(--sp-10);
  }

  .prose h2 {
    margin-top: var(--sp-12);
  }

  .prose h3 {
    margin-top: var(--sp-10);
  }

  .steps__item {
    padding-left: 56px;
  }

  .steps__item::before {
    width: 36px;
    height: 36px;
  }
}

/* -------------------------------------------------------------------------
   8. LAPTOPS (≥ 900 px) — desktop nav appears
   ------------------------------------------------------------------------- */
@media (min-width: 900px) {
  .hero {
    padding-block: var(--sp-16) var(--sp-14);
  }

  .hero__title {
    font-size: clamp(2.5rem, 1.9rem + 2.2vw, 3.5rem);
    letter-spacing: -0.02em;
  }

  .hero__search {
    margin-top: var(--sp-10);
  }

  .section__head {
    margin-bottom: var(--sp-12);
  }

  .tool-page__converter {
    margin-bottom: var(--sp-12);
  }

  .tool-page__section {
    margin-top: var(--sp-16);
  }

  .site-footer__grid {
    gap: var(--sp-12);
  }

  .converter__input,
  .converter__result-value {
    font-size: var(--fs-2xl);
  }
}

/* -------------------------------------------------------------------------
   9. LAPTOPS / DESKTOPS (≥ 1024 px)
   ------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .site-header__inner {
    min-height: var(--header-h-lg);
    padding-inline: var(--sp-8);
  }

  .brand__icon {
    width: 40px;
    height: 40px;
  }

  .brand__name {
    font-size: var(--fs-lg);
  }

  .container,
  .container-narrow,
  .container-converter {
    padding-inline: var(--sp-8);
  }

  .hero {
    padding-block: var(--sp-20) var(--sp-16);
  }

  .section {
    padding-block: var(--sp-20);
  }

  .section--muted {
    padding-block: var(--sp-20);
  }

  .tool-page__title {
    font-size: clamp(2.25rem, 1.8rem + 1.4vw, 3rem);
  }

  .converter {
    padding: var(--sp-10);
    gap: var(--sp-8);
  }

  .converter__input,
  .converter__result-box {
    height: 72px;
    min-height: 72px;
  }

  .converter__input,
  .converter__result-value {
    font-size: 1.75rem;
  }

  .converter__unit,
  .converter__result-unit {
    min-width: 88px;
    font-size: var(--fs-base);
  }

  .data-table {
    font-size: var(--fs-base);
  }

  .faq__summary {
    font-size: var(--fs-md);
    padding: var(--sp-5) var(--sp-6);
  }

  .faq__answer {
    padding-inline: var(--sp-6);
    padding-bottom: var(--sp-6);
    font-size: var(--fs-base);
  }

  .example-block__work {
    font-size: var(--fs-base);
  }

  .formula-block__formula {
    font-size: var(--fs-lg);
  }
}

/* -------------------------------------------------------------------------
   10. DESKTOPS (≥ 1280 px)
   ------------------------------------------------------------------------- */
@media (min-width: 1280px) {
  :root {
    --w-page-max: 1240px;
    --w-content-max: 920px;
  }

  .hero__inner {
    max-width: 860px;
  }

  .hero__title {
    font-size: 3.5rem;
  }

  .site-footer__grid {
    gap: var(--sp-16);
  }

  .tools-grid {
    gap: var(--sp-6);
  }
}

/* -------------------------------------------------------------------------
   11. LARGE DESKTOPS (≥ 1440 px)
   ------------------------------------------------------------------------- */
@media (min-width: 1440px) {
  :root {
    --w-page-max: 1280px;
  }

  .hero__title {
    font-size: 3.75rem;
  }

  .container,
  .container-narrow,
  .container-converter {
    padding-inline: var(--sp-10);
  }

  .section {
    padding-block: var(--sp-24);
  }
}

/* -------------------------------------------------------------------------
   12. ULTRA-WIDE (≥ 1800 px) — cap growth, keep measure comfortable
   ------------------------------------------------------------------------- */
@media (min-width: 1800px) {
  .hero__inner {
    max-width: 900px;
  }

  .prose {
    max-width: 75ch;
  }
}

/* -------------------------------------------------------------------------
   13. LANDSCAPE ORIENTATION FIXES (all sizes)
   ------------------------------------------------------------------------- */
@media (orientation: landscape) and (max-height: 620px) {
  .mobile-nav__panel {
    padding-block: var(--sp-4);
  }

  .mobile-nav__section {
    margin-top: var(--sp-4);
    padding-top: var(--sp-4);
  }

  .mobile-nav__link {
    min-height: 44px;
    padding-block: var(--sp-2);
  }

  .faq__summary {
    min-height: 48px;
  }
}

/* -------------------------------------------------------------------------
   14. TOUCH DEVICES — larger hit areas, no hover-only affordances
   ------------------------------------------------------------------------- */
@media (hover: none) and (pointer: coarse) {
  .converter__action,
  .btn {
    min-height: 48px;
  }

  .site-nav__link,
  .mobile-nav__link,
  .site-footer__link {
    min-height: 44px;
  }

  /* Disable hover-only card elevation on touch to avoid sticky states */
  .card:hover {
    transform: none;
    box-shadow: var(--sh-xs);
    border-color: var(--c-border);
  }

  /* Provide an active feedback instead */
  .card--link:active {
    background: var(--c-bg-alt);
    transform: scale(0.995);
  }
}

/* -------------------------------------------------------------------------
   15. KEYBOARD / MOUSE DEVICES — enable hover refinements
   ------------------------------------------------------------------------- */
@media (hover: hover) and (pointer: fine) {
  .card--link:hover {
    transform: translateY(-3px);
    box-shadow: var(--sh-lg);
  }

  .tool-card:hover .tool-card__glyph {
    background: var(--c-accent);
    color: var(--c-text-invert);
  }
}

/* -------------------------------------------------------------------------
   16. VERY HIGH DPI — no changes needed (no raster assets beyond favicon)
   ------------------------------------------------------------------------- */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .brand__icon,
  .site-footer__brand-icon {
    image-rendering: -webkit-optimize-contrast;
  }
}

/* -------------------------------------------------------------------------
   17. PRINT ORIENTATION
   ------------------------------------------------------------------------- */
@media print and (orientation: landscape) {
  .data-table {
    font-size: 9pt;
  }

  .data-table th,
  .data-table td {
    padding: 4pt 6pt;
  }
}

/* -------------------------------------------------------------------------
   18. REDUCED DATA PREFERENCE (progressive, harmless if unsupported)
   ------------------------------------------------------------------------- */
@media (prefers-reduced-data: reduce) {
  .site-header {
    transition: none;
  }

  .card {
    box-shadow: none;
  }
}

/* -------------------------------------------------------------------------
   19. FORCED COLORS MODE (Windows High Contrast)
   ------------------------------------------------------------------------- */
@media (forced-colors: active) {
  .btn,
  .converter__action,
  .converter__input,
  .converter__result-box,
  .faq__summary {
    border: 1px solid CanvasText;
  }

  .btn:focus-visible,
  .converter__action:focus-visible,
  .converter__input:focus-visible,
  a:focus-visible,
  button:focus-visible,
  input:focus-visible,
  select:focus-visible,
  [tabindex]:focus-visible {
    outline: 3px solid Highlight;
    outline-offset: 2px;
  }

  .converter__result-value {
    forced-color-adjust: none;
    color: CanvasText;
  }
}