/* Hallmark · Round 15 · extend instrument grammar through calculation and product UI */

/* --- Global link underline (1px, 2–3px offset) --- */
a:not(.brand):not(.skip-link):not(.site-rail__current-link) {
  text-decoration-line: underline !important;
  text-decoration-thickness: 1px !important;
  text-underline-offset: 2px !important;
}

a:not(.brand):not(.skip-link):not(.site-rail__current-link):hover,
a:not(.brand):not(.skip-link):not(.site-rail__current-link):focus-visible {
  text-decoration-line: underline !important;
  text-decoration-thickness: 1px !important;
  text-underline-offset: 2px !important;
}

/* --- Desktop dark: TRACE label vs chapter title weight contrast --- */
@media (min-width: 768px) {
  :root[data-theme="dark"] #diagnostic .section__head .kicker {
    margin-bottom: calc(var(--space-2) - 4px);
  }

  :root[data-theme="dark"] #diagnostic .section__head h2 {
    margin-top: 6px;
  }
}

/* --- Mobile p1 tracks: 4px / 12px / 24px spacing by meaning --- */
@media (max-width: 767px) {
  #diagnostic .track-panel .choice-group {
    margin-top: 0;
    gap: 0;
  }

  #diagnostic .choice-group label {
    padding-block: 8px;
  }

  #diagnostic .choice-group label + label::before {
    display: none;
  }

  #diagnostic .choice--unknown {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  #diagnostic .choice--unknown .choice__body {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  #diagnostic .choice__hint {
    margin: 0;
    padding: 0;
  }

  #diagnostic .track-panel .choice-group + .choice-group,
  #diagnostic fieldset.choice-group[style*="margin-top"] {
    margin-top: 12px !important;
  }

  #diagnostic .terminal-copy {
    margin-top: 12px;
  }

  #diagnostic > .section + .section {
    margin-top: 24px;
  }

  #diagnostic > .section + .section::before {
    display: none;
  }
}

/* --- Mobile calc slide rule: four nodes on one shared rail --- */
@media (max-width: 767px) {
  .scale-calc {
    padding: var(--space-4) 0;
    border: 0;
    background: transparent;
  }

  .calc-rail__layer--desktop,
  .calc-rail__formula--desktop,
  .site-rail--calc .site-rail__meta,
  .gap-bracket--desktop {
    display: none;
  }

  .calc-slide-track {
    min-height: 7.5rem;
    margin-top: var(--space-3);
  }

  .calc-rail__layer--slide {
    position: absolute;
    inset: 0;
  }

  .calc-rail__node {
    position: absolute;
    left: var(--rail-pos);
    bottom: var(--rail-rule-inset);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 3.5rem;
    margin: 0;
    transform: translateX(-50%);
    text-align: center;
  }

  .calc-rail__node-cap {
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 2px;
    height: var(--rail-tick-length);
    background: var(--role-position);
    transform: translateX(-50%);
  }

  .calc-rail__node-label {
    position: absolute;
    bottom: calc(var(--rail-tick-length) + 6px);
    left: 50%;
    color: var(--color-ink-faint);
    font-family: var(--font-metadata);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.35;
    white-space: nowrap;
    transform: translateX(-50%);
  }

  .calc-rail__node input,
  .calc-rail__node-value {
    position: absolute;
    bottom: calc(var(--rail-tick-length) + 26px);
    left: 50%;
    width: 3.25rem;
    margin: 0;
    padding: 4px;
    border: 1px solid var(--color-rule);
    background: var(--surface-active);
    color: var(--color-ink);
    font-family: var(--font-metadata);
    font-size: 1rem;
    line-height: 1.4;
    text-align: center;
    transform: translateX(-50%);
  }

  .calc-rail__node-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
    width: auto;
    min-width: 3.5rem;
    padding: 0;
    border: 0;
    background: transparent;
    font-size: 14px;
  }

  .calc-rail__node--required .calc-rail__node-value strong {
    color: var(--color-ink);
    font-size: 1.125rem;
    font-weight: 400;
  }

  .calc-rail__node--shortage .gap-bracket__result {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
    margin: 0;
    font-size: 14px;
  }

  .calc-rail__node--shortage .gap-bracket__result strong {
    color: var(--role-link-danger);
    font-size: 1.125rem;
    font-weight: 400;
  }
}

/* Desktop calc: slide layer becomes secondary inputs; shortage readout below */
@media (min-width: 768px) {
  .calc-rail__layer--slide {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-5);
  }

  .calc-rail__node {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin: 0;
    font-size: 14px;
  }

  .calc-rail__node-cap,
  .calc-rail__node-label {
    display: none;
  }

  .calc-rail__node--people::before {
    content: "人数";
    font-size: 14px;
  }

  .calc-rail__node--days::before {
    content: "日数";
    font-size: 14px;
  }

  .calc-rail__node--required {
    display: none;
  }

  .calc-rail__node--shortage {
    grid-column: 1 / -1;
    display: block;
    position: static;
    transform: none;
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-rule-soft);
  }

  .calc-rail__node--shortage .calc-rail__node-cap,
  .calc-rail__node--shortage .calc-rail__node-label {
    display: none;
  }

  .calc-rail__node--shortage #gap-result {
    display: grid;
    position: static;
    width: auto;
    padding: 0;
    border: 0;
    background: transparent;
    transform: none;
  }

  .calc-rail__node input {
    width: 100%;
    margin: 0;
    padding: var(--space-3);
    border: 1px solid var(--color-rule);
    background: var(--surface-active);
    font-family: var(--font-metadata);
    font-size: var(--text-lg);
  }

  .gap-bracket--desktop {
    display: block;
    margin-top: var(--space-4);
  }
}

/* --- p2 desktop: ruler guide from よくある誤解 end tick to 給水方式 left --- */
@media (min-width: 768px) {
  .category-water-system {
    --ruler-guide-x: 66.6667%;
  }

  .category-water-system > .comparison-axis-section:first-of-type {
    position: relative;
    width: var(--ruler-guide-x);
    margin-right: auto;
    margin-left: 0;
    padding-right: 0;
  }

  .category-water-system > .comparison-axis-section:first-of-type::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 2px;
    height: 100%;
    background: var(--color-rule);
    pointer-events: none;
  }

  .category-water-system > .supply-method-section {
    width: calc(100% - var(--ruler-guide-x));
    margin-right: 0;
    margin-left: var(--ruler-guide-x);
    padding-left: 0;
  }

  .category-water-system > .supply-method-section .supply-method-axis__scale {
    margin-left: 0;
    padding-left: 0;
  }

  .supply-method-axis__scale::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: var(--rail-tick-length);
    background: var(--role-position);
  }
}

/* p2 desktop light: one section on base tone, rules only */
@media (min-width: 768px) {
  :root:not([data-theme="dark"]) .category-water-system > .category-conclusion {
    margin-block: var(--space-7);
    padding: var(--space-5) 0;
    border: 0;
    border-block: 1px solid var(--color-rule);
    background: transparent;
  }

  :root:not([data-theme="dark"]) .article-body > .category-conclusion {
    background: transparent;
  }
}

/* --- Product table: left tick rail bound to capacity scale grid --- */
@media (min-width: 768px) {
  .water-comparison {
    --row-rail-width: 12px;
    --row-rail-gap: var(--space-3);
  }

  .water-comparison thead th:nth-child(3),
  .water-comparison__capacity {
    position: relative;
    padding-left: calc(var(--row-rail-width) + var(--row-rail-gap));
  }

  .water-comparison thead th:nth-child(3)::before,
  .water-comparison__capacity::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: var(--row-rail-width);
    background-image: repeating-linear-gradient(
      to bottom,
      var(--color-rule) 0 1px,
      transparent 1px var(--rail-tick-spacing)
    );
    background-repeat: repeat-y;
    background-size: 1px auto;
    pointer-events: none;
  }

  .product-purpose-group__row > th {
    padding-left: calc(var(--row-rail-width) + var(--row-rail-gap));
  }

  .water-comparison__capacity-scale {
    margin-left: 0;
  }

  .product-purpose-group__trace {
    margin-right: var(--space-3);
    color: var(--color-ink-faint);
    font-family: var(--font-metadata);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.04em;
  }

  .product-purpose-group__heading {
    display: flex;
    align-items: baseline;
    gap: var(--space-2);
  }
}

/* --- p2 mobile: Amazon link baseline aligned with capacity scale exit --- */
@media (max-width: 767px) {
  .water-comparison__row > td.water-comparison__capacity {
    padding-bottom: 0;
  }

  .water-comparison__actions .product-table__action {
    display: flex;
    align-items: baseline;
    justify-content: flex-end;
    margin-top: calc(-1 * var(--space-4));
    padding-top: 0;
    border-top: 0;
  }

  .water-comparison__capacity-scale {
    margin-bottom: 0;
  }

  .water-comparison__actions .product-table__link {
    line-height: 1.4;
  }
}