/*
 * base.css — 4サイト共通。リセット・タイポグラフィの基礎・レイアウトの骨格・フォーム部品だけを置く。
 * 配色・書体・装飾は各サイトの theme.css で決める（同じ見た目のサイト群にしないため）。
 * theme.css で定義する変数: --font-body --font-head --font-num --c-bg --c-surface --c-text --c-muted
 *   --c-border --c-accent --c-on-accent --c-link --c-focus --radius --container
 */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body, 1rem);
  line-height: var(--lh-body, 1.85);
  color: var(--c-text);
  background: var(--c-bg);
  overflow-wrap: anywhere;
  line-break: strict;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote, table { margin: 0; }
h1, h2, h3, h4 { font-family: var(--font-head, var(--font-body)); line-height: 1.4; word-break: auto-phrase; text-wrap: balance; }
ul[class], ol[class], .site-nav ul, .footer-nav ul { list-style: none; padding: 0; }
img { max-width: 100%; height: auto; display: block; }
svg { max-width: 100%; }
a { color: var(--c-link); text-underline-offset: 0.2em; }
:focus-visible { outline: 3px solid var(--c-focus); outline-offset: 2px; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--c-border); margin: 48px 0; }

.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 16px; top: 16px; z-index: 100; padding: 8px 14px; background: #fff; color: #000; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* レイアウト */
.container { width: min(100% - 32px, var(--container, 1080px)); margin-inline: auto; }
.narrow { --container: 780px; }
.section { padding-block: var(--section-pad, clamp(56px, 8vw, 104px)); }
.stack > * + * { margin-top: var(--stack, 1em); }
.grid-2, .grid-3, .grid-4 { display: grid; gap: var(--gap, 24px); }
@media (min-width: 720px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ヘッダー */
.site-header { position: relative; z-index: 10; }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.brand-mark svg { width: 32px; height: 32px; display: block; }
.site-nav ul { display: flex; align-items: center; gap: 4px 20px; }
.site-nav a { text-decoration: none; color: inherit; white-space: nowrap; }
@media (max-width: 719px) {
  .header-inner { padding-block: 10px; }
  .site-nav { width: 100%; }
  .site-nav ul { flex-wrap: wrap; gap: 6px 16px; font-size: 0.875rem; padding-bottom: 4px; }
}

/* ボタン */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  padding: 0.85em 1.6em; border-radius: var(--radius, 6px); border: 2px solid transparent;
  font: inherit; font-weight: 700; line-height: 1.3; text-decoration: none; cursor: pointer;
}
.btn-sm { padding: 0.5em 1em; font-size: 0.875rem; }
.btn-lg { padding: 1em 2em; font-size: 1.0625rem; }
.btn-primary { background: var(--c-accent); color: var(--c-on-accent); }
.btn-outline { border-color: currentColor; color: inherit; background: transparent; }
.btn[disabled] { opacity: 0.6; cursor: wait; }
.actions { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: center; }

/* 本文 */
.lead { font-size: clamp(1rem, 0.95rem + 0.35vw, 1.1875rem); }
.note { font-size: 0.875rem; color: var(--c-muted); }
.prose h2 { margin-top: 2.2em; margin-bottom: 0.6em; font-size: 1.25rem; }
.prose h3 { margin-top: 1.6em; margin-bottom: 0.4em; font-size: 1.0625rem; }
.prose p, .prose ul, .prose ol { margin-bottom: 1em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.alt-lang { margin-top: 64px; padding-top: 48px; border-top: 1px solid var(--c-border); }

/* 会社概要の表（スマホでは縦積み） */
.company-table th, .company-table td { text-align: left; vertical-align: top; padding: 14px 0; border-bottom: 1px solid var(--c-border); }
.company-table th { width: 9em; font-weight: 700; padding-right: 16px; }
@media (max-width: 559px) {
  .company-table tr { display: block; padding: 12px 0; border-bottom: 1px solid var(--c-border); }
  .company-table th, .company-table td { display: block; width: auto; padding: 0; border: 0; }
  .company-table th { font-size: 0.8125rem; color: var(--c-muted); margin-bottom: 2px; }
}

/* フォーム */
.form { display: grid; gap: 20px; }
.field label, .field .label { display: block; font-weight: 700; margin-bottom: 6px; }
.req, .opt { display: inline-block; margin-left: 0.5em; padding: 0 0.5em; font-size: 0.75rem; font-weight: 700; border-radius: 3px; vertical-align: 0.1em; }
.req { background: var(--c-accent); color: var(--c-on-accent); }
.opt { border: 1px solid var(--c-border); color: var(--c-muted); }
.field input[type="text"], .field input[type="email"], .field input[type="tel"], .field select, .field textarea {
  width: 100%; font: inherit; color: inherit; background: var(--c-surface, #fff);
  border: 1px solid var(--c-border); border-radius: var(--radius, 6px); padding: 0.75em 0.9em;
}
.field textarea { min-height: 10em; resize: vertical; }
.field input[readonly] { background: transparent; }
.check { display: flex; gap: 0.6em; align-items: flex-start; }
.check input { margin-top: 0.45em; width: 1.1em; height: 1.1em; flex: none; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.inline-form { display: flex; flex-wrap: wrap; gap: 12px; }
.inline-form .field { flex: 1 1 260px; margin: 0; }
.form-status { min-height: 1.5em; font-weight: 700; }
.form-status.is-error { color: #b42318; }
.form-done { padding: 24px; border: 1px solid var(--c-border); border-radius: var(--radius, 6px); background: var(--c-surface, #fff); }

/* フッター */
.footer-inner { display: grid; gap: 24px; padding-block: 40px 24px; }
@media (min-width: 720px) { .footer-inner { grid-template-columns: 1.4fr 1fr; } }
.footer-nav ul { display: grid; gap: 8px; }
.footer-brand { font-weight: 700; margin-bottom: 8px; }
.copyright { padding-block: 16px 32px; font-size: 0.8125rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}