:root {
  /* logo colors: red #a90000 / grey #b2b2b2 */
  --bg: #ffffff;
  --surface: #f4f4f4;
  --text: #1f1f1f;
  --muted: #5f5f5f;
  --border: #e0e0e0;
  --accent: #a90000;
  --accent-text: #ffffff;
  --accent-strong: #7a0000;
  --code-bg: #1c1c1c;
  --code-text: #ececec;
  --measure: 46rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151515;
    --surface: #1f1f1f;
    --text: #e8e8e8;
    --muted: #a8a8a8;
    --border: #333333;
    --accent: #ff7373;
    --accent-text: #151515;
    --accent-strong: #ff9c9c;
    --code-bg: #0d0d0d;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  font-size: 1rem;
  line-height: 1.85;
}
a { color: var(--accent); }
.container { max-width: var(--measure); margin: 0 auto; padding: 0 16px; }
main.container { padding-top: 2rem; padding-bottom: 4rem; }
h1 { font-size: 1.9rem; line-height: 1.4; margin: 0 0 1rem; }
h2 { font-size: 1.35rem; line-height: 1.5; margin: 2.5rem 0 1rem; }
h3 { font-size: 1.1rem; margin: 2rem 0 .75rem; }

/* header / footer */
.site-header { border-top: 4px solid var(--accent); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: center; justify-content: space-between; padding-top: .9rem; padding-bottom: .9rem; }
.brand { color: var(--text); text-decoration: none; display: flex; align-items: center; gap: .75rem; line-height: 1.3; }
.brand-logo { display: block; height: 48px; width: auto; }
.brand-sub { font-size: .72rem; color: var(--muted); padding-left: .75rem; border-left: 1px solid var(--border); }
.nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; font-size: .92rem; align-items: center; }
.nav a { color: var(--text); text-decoration: none; }
.nav a:hover { color: var(--accent); }
.nav a[aria-current="page"] { color: var(--accent); font-weight: 600; text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: .45em; }
.nav .nav-cta { color: var(--accent-text); background: var(--accent); font-weight: 600; border: 1px solid var(--accent); border-radius: 6px; padding: .2rem .8rem; }
.nav .nav-cta:hover { color: var(--accent-text); background: var(--accent-strong); border-color: var(--accent-strong); }
/* Current page: keep the button look and add a ring, so it is not confused with the underlined current item */
.nav .nav-cta[aria-current="page"] { color: var(--accent-text); text-decoration: none; box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); }
.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; padding: 1.5rem 0; }
.site-footer p { margin: .25rem 0; }
.site-footer a { color: var(--muted); }

/* components */
.button { display: inline-block; background: var(--accent); color: var(--accent-text); text-decoration: none; padding: .6rem 1.3rem; border-radius: 6px; font-weight: 600; border: 1px solid var(--accent); }
.button-ghost { background: transparent; color: var(--accent); }
.lead { font-size: 1.08rem; color: var(--muted); }
.center { text-align: center; margin-top: 2.5rem; }
.hero { padding: 1rem 0 1rem; }
.hero h1 { font-size: clamp(1.35rem, 4.2vw, 2rem); line-height: 1.45; margin-bottom: .75rem; word-break: auto-phrase; text-wrap: balance; }
.hero-lead { margin: 0 0 1.25rem; line-height: 1.75; word-break: auto-phrase; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 0; }
.hero-stack { margin: 1rem 0 0; font-size: .82rem; color: var(--muted); }
.section-title { border-bottom: 1px solid var(--border); padding-bottom: .5rem; }
.more { text-align: right; }
.empty { color: var(--muted); }

.article-list { list-style: none; padding: 0; margin: 0; }
.article-list li + li { border-top: 1px solid var(--border); }
.article-card { display: block; padding: 1.1rem 0; text-decoration: none; color: var(--text); }
.article-card .meta { display: block; font-size: .8rem; color: var(--muted); }
.article-card .title { display: block; font-weight: 700; font-size: 1.1rem; line-height: 1.5; margin: .2rem 0; }
.article-card:hover .title { color: var(--accent); }
.article-card .desc { display: block; font-size: .92rem; color: var(--muted); }

.category-nav { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.5rem; }
.category-nav a { font-size: .85rem; padding: .2rem .75rem; border: 1px solid var(--border); border-radius: 999px; text-decoration: none; color: var(--muted); }
.category-nav a[aria-current="page"] { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }

.cta { margin-top: 3.5rem; padding: 1.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; }
.cta-lead { font-weight: 700; font-size: 1.1rem; margin-top: 0; }
.cta-menu { display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem .75rem; margin-bottom: .25rem; }
.cta-menu-name { font-weight: 700; font-size: 1.15rem; }
.cta-actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.cta-note { margin-bottom: 0; font-size: .9rem; color: var(--muted); }

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th, td { border-bottom: 1px solid var(--border); padding: .6rem .5rem; text-align: left; vertical-align: top; }
th { background: var(--surface); }
.menu td:last-child { white-space: nowrap; }
.contact-mail { font-size: 1.25rem; font-weight: 700; }
.contact-list { list-style: none; padding: 0; font-size: 1.1rem; }
.notice { color: var(--accent); font-weight: 600; font-size: .92rem; }
.note { color: var(--muted); font-size: .85rem; }
ul.note { padding-left: 1.25rem; }
.info { display: grid; grid-template-columns: max-content 1fr; gap: .4rem 1.25rem; margin: 1rem 0; }
.info dt { font-weight: 600; }
.info dd { margin: 0; }
@media (max-width: 480px) { .info { grid-template-columns: 1fr; gap: .1rem; } .info dd { margin-bottom: .6rem; } }
.map { position: relative; aspect-ratio: 4 / 3; margin: 1.5rem 0; }
.map iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: 8px; }
.photo { margin: 1.5rem 0; }
.photo img { width: 100%; max-width: 480px; height: auto; border-radius: 8px; display: block; }
.photo figcaption { font-size: .88rem; color: var(--muted); margin-top: .4rem; }

/* profile */
.profile-head { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem; }
.profile-face { width: 120px; height: 120px; border-radius: 50%; object-fit: cover; }
.profile-name { font-size: 1.3rem; font-weight: 700; margin: 0; }
.profile-name span { display: block; font-size: .85rem; font-weight: 400; color: var(--muted); }
.profile-head .lead { margin: .25rem 0 0; }

/* works */
.works { display: grid; gap: 1rem; }
.work { border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; }
.work h4 { font-size: 1.05rem; margin: .25rem 0 .5rem; }
.work-summary { margin: 0 0 .5rem; font-size: .95rem; }
.work ul { margin: 0; padding-left: 1.25rem; font-size: .95rem; }
.work-meta { display: flex; flex-wrap: wrap; gap: .25rem 1rem; margin: 0; font-size: .82rem; color: var(--muted); }
.work-stack { margin: .75rem 0 0; font-size: .82rem; color: var(--muted); }

/* article */
.tags { list-style: none; padding: 0; margin: 0 0 1rem; display: flex; flex-wrap: wrap; gap: .4rem; }
.tags li { font-size: .78rem; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: .05rem .5rem; }
.article-header .meta { font-size: .85rem; color: var(--muted); margin: 0 0 .5rem; }
.prose { overflow-wrap: anywhere; }
.prose h2 { border-bottom: 1px solid var(--border); padding-bottom: .4rem; }
.prose .heading-permalink { margin-left: .4rem; color: var(--muted); text-decoration: none; font-weight: 400; opacity: 0; }
.prose h2:hover .heading-permalink, .prose h3:hover .heading-permalink { opacity: 1; }
.prose blockquote { margin: 1.5rem 0; padding: .25rem 1rem; border-left: 4px solid var(--border); color: var(--muted); }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em; background: var(--surface); padding: .1em .35em; border-radius: 4px; }
.prose pre { background: var(--code-bg); color: var(--code-text); padding: 1rem; border-radius: 8px; overflow-x: auto; line-height: 1.6; }
.prose pre code { background: none; padding: 0; color: inherit; }
.prose img { max-width: 100%; height: auto; }
.related { margin-top: 3rem; }
.article-footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border); font-size: .85rem; color: var(--muted); }
.error-page { text-align: center; padding-top: 5rem; }

/* home */
.home-section { margin-top: 3.5rem; }
.cards { list-style: none; padding: 0; margin: 1.25rem 0 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.cards > li { border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; background: var(--bg); }
.cards h3 { font-size: 1.02rem; line-height: 1.55; margin: 0 0 .5rem; word-break: auto-phrase; }
.cards p { margin: .4rem 0 0; font-size: .92rem; }
.cards .problem-menu, .cards .problem-article { color: var(--muted); font-size: .85rem; }
.cards .service-price { font-weight: 700; font-size: 1.05rem; color: var(--accent); }
.home-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.home-section .category-nav { margin: 1rem 0 0; }
.achievements { list-style: none; padding: 0; margin: 1.25rem 0 0; display: grid; gap: 1rem; }
.achievement { border-left: 3px solid var(--accent); padding: .1rem 0 .1rem 1rem; }
.achievement h3 { font-size: 1.02rem; margin: .2rem 0 .3rem; }
.achievement p { margin: 0; font-size: .92rem; }
.author { display: flex; align-items: center; gap: 1rem; margin-top: 1.5rem; }
.author-face { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; }
.author p { margin: 0; font-size: .9rem; line-height: 1.6; }
.flow { padding-left: 1.5rem; }
.flow li + li { margin-top: .4rem; }
#faq details { border-bottom: 1px solid var(--border); padding: .75rem 0; }
#faq summary { cursor: pointer; font-weight: 600; }
#faq details p { margin: .5rem 0 0; font-size: .95rem; }
.contact-box { padding: 1.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; }
.contact-box h2 { margin-top: 0; }

/* service pages */
.breadcrumb { font-size: .85rem; margin: 0 0 .5rem; }
.breadcrumb a { color: var(--muted); }
.service-price { font-weight: 700; color: var(--accent); }
.cards .service-more { margin-top: .75rem; }
.scope { display: grid; gap: 0 1.5rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.scope h3 { margin: .5rem 0 .25rem; font-size: 1rem; }
.other-menus { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.other-menus h2 { font-size: 1.1rem; margin-top: 0; }
.ai-development { margin-top: 2.5rem; padding: 1rem 1.25rem; border-left: 3px solid var(--accent); background: var(--surface); border-radius: 0 8px 8px 0; }
.ai-development h2 { margin-top: 0; }
.cards .service-audience { color: var(--muted); font-size: .85rem; }
.pricing-examples { padding-left: 1.25rem; }
.selected-menu { padding: .75rem 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; }

/* contact form */
.contact-form { margin: 1.5rem 0 2.5rem; }
.contact-form .field { margin-bottom: 1.25rem; }
.contact-form label { display: block; font-weight: 600; margin-bottom: .35rem; }
.contact-form .required, .contact-form .optional { font-size: .75rem; font-weight: 600; margin-left: .5rem; padding: .05rem .4rem; border-radius: 4px; vertical-align: middle; }
.contact-form .required { color: var(--accent-text); background: var(--accent); }
.contact-form .optional { color: var(--muted); border: 1px solid var(--border); }
.contact-form input[type="text"], .contact-form input[type="email"], .contact-form select, .contact-form textarea {
  box-sizing: border-box; width: 100%; max-width: 100%; padding: .6rem .7rem; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
}
.contact-form textarea { resize: vertical; min-height: 10rem; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.contact-form [aria-invalid="true"] { border-color: var(--accent); }
.contact-form .field-error { color: var(--accent); font-weight: 600; margin: .35rem 0 0; }
.contact-form .field-help { color: var(--muted); font-size: .9rem; margin: .35rem 0 0; }
.contact-form .field-trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.contact-form .form-submit { margin-top: 1.75rem; }
.contact-form button.button { cursor: pointer; font: inherit; font-weight: 600; }
.form-notice { padding: .9rem 1rem; border: 1px solid var(--accent); border-radius: 8px; background: var(--surface); }