/* 社内システム開発: 方眼の設計図のような薄い地にティール。業務アプリらしい、きっちりした見た目。 */
:root {
  color-scheme: light;
  --night: #f5f8fa;            /* 地（名前は共通HTMLの見本用に流用） */
  --night-2: #ffffff;          /* 面 */
  --night-3: #eaf0f3;          /* 一段濃い面 */
  --ink: #10212b; --mute: #5a6b75; --line: #d6e0e6;
  --dawn: #0f8b8d;             /* アクセント：ティール */
  --sea: #3a78c2; --leaf: #2e9e5b; --rose: #c94b4b;
  --grid: rgb(15 139 141 / .07);
  --display: "BIZ UDPGothic", "Hiragino Sans", "Yu Gothic", sans-serif;
  --body: "BIZ UDPGothic", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --s1: .75rem; --s2: 1rem; --s3: 1.5rem; --s4: 2.5rem; --s5: 4rem; --s6: 6rem;
}
* { box-sizing: border-box; }
html, body { background: var(--night); }
body { margin: 0; color: var(--ink); font: 400 1rem/1.85 var(--body); -webkit-font-smoothing: antialiased;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 24px 24px; }
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }
:focus-visible { outline: 2px solid var(--dawn); outline-offset: 3px; }
.wrap { width: min(74rem, 100%); margin-inline: auto; padding-inline: max(16px, 4vw); }
.mono { font-family: var(--mono); font-size: .74rem; letter-spacing: .06em; color: var(--dawn); }

.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: var(--ink); color: #e9f1f4; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--s2); padding-block: .65rem; }
.logo { font-family: var(--mono); font-weight: 700; font-size: 1.02rem; letter-spacing: .14em; text-decoration: none; display: flex; align-items: baseline; gap: .5rem; white-space: nowrap; }
.logo small { font-weight: 400; font-size: .64rem; letter-spacing: .2em; color: #6fd3d4; }
.top nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .3rem 1.3rem; font-size: .82rem; }
.top nav a { text-decoration: none; color: #a9bcc5; }
.top nav a:hover { color: #fff; }
.top nav a[aria-current="page"] { color: #fff; box-shadow: inset 0 -2px 0 #6fd3d4; }
@media (max-width: 760px) { .top .wrap { flex-direction: column; align-items: flex-start; gap: .4rem; } .top nav { justify-content: flex-start; gap: .2rem 1rem; font-size: .78rem; } }

.hero { padding-block: var(--s5); border-bottom: 1px solid var(--line); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.15fr); gap: var(--s4); align-items: center; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: minmax(0, 1fr); } }
.eyebrow { font-family: var(--mono); font-size: .76rem; color: var(--dawn); }
.eyebrow::before { content: "> "; }
.hero h1 { margin: .7rem 0 0; font-family: var(--display); font-weight: 700; font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.3; text-wrap: balance; }
.hero h1 b { color: var(--dawn); font-weight: 700; border-bottom: 3px solid var(--dawn); }
.hero p.lead { color: var(--mute); margin: var(--s2) 0 0; max-width: 34em; }
.cta { display: flex; flex-wrap: wrap; gap: var(--s2); margin-top: var(--s3); }
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .8rem 1.4rem; border: 1px solid var(--dawn); color: #fff; background: var(--dawn); text-decoration: none; font-weight: 700; font-size: .92rem; border-radius: 6px; }
.btn.ghost { background: var(--night-2); color: var(--dawn); }
.btn:hover { filter: brightness(1.08); }

section { padding-block: var(--s6) 0; }
.head { display: grid; gap: .4rem; margin-bottom: var(--s4); }
.head .mono::before { content: "// "; }
.head h2 { margin: 0; font-family: var(--display); font-weight: 700; font-size: clamp(1.6rem, 3.8vw, 2.3rem); line-height: 1.35; text-wrap: balance; }
.head p { margin: 0; color: var(--mute); max-width: 42em; }

.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
@media (max-width: 860px) { .grid3 { grid-template-columns: minmax(0, 1fr); } }
.cell { background: var(--night-2); padding: var(--s3); display: grid; gap: .5rem; align-content: start; min-width: 0; }
.cell h3 { margin: 0; font-family: var(--display); font-weight: 700; font-size: 1.1rem; line-height: 1.5; }
.cell p { margin: 0; color: var(--mute); font-size: .92rem; }
.cell .mono { font-size: .7rem; padding: .1rem .45rem; border: 1px solid color-mix(in srgb, var(--dawn) 40%, transparent); border-radius: 4px; justify-self: start; }

.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s2); }
@media (max-width: 760px) { .grid2 { grid-template-columns: minmax(0, 1fr); } }
.card { border: 1px solid var(--line); background: var(--night-2); border-radius: 8px; padding: var(--s3); display: grid; gap: .6rem; align-content: start; min-width: 0; }
.card h3 { margin: 0; font-family: var(--display); font-weight: 700; font-size: 1.1rem; }
.card p { margin: 0; color: var(--mute); font-size: .9rem; }
.tag { justify-self: start; font-family: var(--mono); font-size: .64rem; letter-spacing: .08em; padding: .15rem .5rem; border-radius: 4px; background: var(--ink); color: #6fd3d4; }

.flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; counter-reset: step; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--night-2); }
@media (max-width: 900px) { .flow { grid-template-columns: minmax(0, 1fr); } }
.flow li { counter-increment: step; padding: var(--s3) var(--s2); display: grid; gap: .4rem; align-content: start; min-width: 0; border-right: 1px solid var(--line); position: relative; }
.flow li:last-child { border-right: 0; }
@media (max-width: 900px) { .flow li { border-right: 0; border-bottom: 1px solid var(--line); } }
.flow li::before { content: "STEP " counter(step); font-family: var(--mono); font-size: .7rem; color: var(--dawn); }
.flow h3 { margin: 0; font-family: var(--display); font-size: 1.02rem; }
.flow p { margin: 0; color: var(--mute); font-size: .88rem; }

.faq { border: 1px solid var(--line); border-radius: 8px; background: var(--night-2); overflow: hidden; }
.faq details { border-bottom: 1px solid var(--line); padding: var(--s2) var(--s3); }
.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::before { content: "Q."; font-family: var(--mono); color: var(--dawn); margin-right: .6rem; }
.faq summary { justify-content: flex-start; }
.faq summary::after { content: "+"; margin-left: auto; font-family: var(--mono); color: var(--dawn); }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: .6rem 0 0 1.9rem; color: var(--mute); font-size: .92rem; max-width: 46em; }

.ask { margin-top: var(--s6); background: var(--ink); color: #e9f1f4; }
.ask .wrap { padding-block: var(--s5); display: grid; grid-template-columns: minmax(0, 1.4fr) auto; gap: var(--s3); align-items: center; }
@media (max-width: 760px) { .ask .wrap { grid-template-columns: minmax(0, 1fr); } }
.ask h2 { margin: 0; font-family: var(--display); font-size: clamp(1.5rem, 3.6vw, 2.2rem); line-height: 1.4; }
.ask p { margin: .4rem 0 0; color: #a9bcc5; }

.other { padding-block: var(--s5); }
.other a { text-decoration: none; }
.other .card:hover { border-color: var(--dawn); }
.other .go { font-family: var(--mono); font-size: .74rem; color: var(--dawn); }

footer { border-top: 1px solid var(--line); background: var(--night-2); }
footer .wrap { padding-block: var(--s4); display: flex; flex-wrap: wrap; gap: var(--s2) var(--s4); justify-content: space-between; color: var(--mute); font-size: .82rem; }
footer nav { display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; }
footer a { text-decoration: none; }
footer a:hover { color: var(--ink); }