/* Mikata marketing site — shared styles.
   Brand: ai-indigo (藍) + sakura accent on warm paper. Light, editorial, confident. */
:root {
  --ai: #2b3a8f;          /* indigo / 藍 */
  --ai-deep: #1d2a6e;
  --ai-soft: #eef1ff;
  --sakura: #ff8aa6;
  --sakura-soft: #ffe9ef;
  --ink: #161a2b;
  --body: #3a3f55;
  --muted: #6b7088;
  --paper: #ffffff;
  --paper2: #f7f8fc;
  --line: #e6e8f2;
  --good: #1c9d6b;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(27, 33, 73, .08);
  --maxw: 1140px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--body); background: var(--paper);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.6; font-size: 17px;
}
h1, h2, h3 { color: var(--ink); line-height: 1.2; margin: 0 0 .5em; font-weight: 700; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); letter-spacing: -.01em; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
a { color: var(--ai); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.lead { font-size: 1.2rem; color: var(--muted); }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--ai); }
.center { text-align: center; }

/* buttons */
.btn {
  display: inline-block; padding: 13px 24px; border-radius: 999px; font-weight: 600;
  font-size: 1rem; cursor: pointer; border: 1.5px solid transparent; transition: .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--ai); color: #fff; }
.btn-primary:hover { background: var(--ai-deep); }
.btn-ghost { background: #fff; color: var(--ai); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ai); }
.btn-lg { padding: 16px 32px; font-size: 1.05rem; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.85);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 20px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); font-size: 1.15rem; }
.brand:hover { text-decoration: none; }
.brand .word { font-family: "Zen Kaku Gothic New", "Segoe UI", system-ui, sans-serif; font-weight: 700; letter-spacing: -.005em; }
.brand .mark {
  width: 34px; height: 34px; display: block; flex: none;
}
.nav { display: flex; gap: 22px; margin-left: 12px; }
.nav a { color: var(--body); font-weight: 500; font-size: .98rem; }
.nav a:hover { color: var(--ai); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--ai); font-weight: 700; }
.site-header .spacer { flex: 1; }
.header-cta { display: flex; gap: 10px; align-items: center; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; color: var(--ink); padding: 4px; line-height: 0; }
.nav-toggle svg { width: 24px; height: 24px; }

/* hero */
.hero { padding: 80px 0 60px; background:
  radial-gradient(1200px 400px at 70% -10%, var(--ai-soft), transparent),
  radial-gradient(800px 300px at 0% 10%, var(--sakura-soft), transparent); }
.hero .jp { font-size: 1rem; color: var(--ai); font-weight: 700; letter-spacing: .3em; }
.hero h1 { margin-top: 8px; }
.hero .lead { max-width: 620px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-note { margin-top: 14px; font-size: .9rem; color: var(--muted); }

/* sections */
section.band { padding: 72px 0; }
section.band.alt { background: var(--paper2); }
.section-head { max-width: 720px; margin: 0 auto 44px; }

/* the loop */
.loop { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.loop .step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; position: relative; }
.loop .step .n { font-size: .8rem; font-weight: 700; color: var(--sakura); }
.loop .step h3 { margin: 6px 0 6px; }
.loop .step p { font-size: .95rem; margin: 0; color: var(--muted); }
.loop .arrow { display: none; }

/* pillars / feature cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cards.duo { grid-template-columns: repeat(2, 1fr); max-width: 760px; margin: 0 auto; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.card .ic { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 12px; background: var(--ai-soft); color: var(--ai); }
.card .ic svg { width: 24px; height: 24px; }
.card h3 { margin: 12px 0 8px; }
.card p { color: var(--muted); font-size: .98rem; margin: 0; }
.card ul { margin: 12px 0 0; padding-left: 18px; color: var(--muted); font-size: .95rem; }
.card ul li { margin: 4px 0; }

/* feature matrix grouped by audience */
.audience { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.audience .col { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.audience .col h3 { display: flex; align-items: center; gap: 10px; }
.audience .col h3 .ico { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 9px; background: var(--ai-soft); color: var(--ai); }
.audience .col h3 .ico svg { width: 20px; height: 20px; }
.audience .col .who { font-size: .85rem; color: var(--muted); margin-bottom: 14px; }
.feature-list { list-style: none; margin: 0; padding: 0; }
.feature-list li { padding: 7px 0 7px 26px; position: relative; font-size: .96rem; border-top: 1px solid var(--line); }
.feature-list li:first-child { border-top: 0; }
.feature-list li::before { content: "✓"; position: absolute; left: 0; color: var(--good); font-weight: 800; }

/* differentiator callout */
.callout {
  background: linear-gradient(135deg, var(--ai), #3a4db0); color: #fff;
  border-radius: 20px; padding: 48px; text-align: center;
}
.callout h2 { color: #fff; }
.callout p { color: #dfe4ff; max-width: 680px; margin: 0 auto 8px; font-size: 1.1rem; }

/* pricing */
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; align-items: stretch; }
.plan { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; }
.plan.featured { border: 2px solid var(--ai); box-shadow: var(--shadow); position: relative; }
.plan .badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--ai); color: #fff; font-size: .72rem; font-weight: 700; padding: 4px 12px; border-radius: 999px; text-transform: uppercase; letter-spacing: .08em; }
.plan .pname { font-weight: 800; font-size: 1.15rem; color: var(--ink); }
.plan .price { font-size: 2rem; font-weight: 800; color: var(--ink); margin: 12px 0 2px; }
.plan .price small { font-size: .9rem; font-weight: 500; color: var(--muted); }
.plan .per { color: var(--muted); font-size: .85rem; margin-bottom: 16px; }
.plan .desc { font-size: .92rem; color: var(--muted); min-height: 40px; }
.plan ul { list-style: none; padding: 0; margin: 16px 0; flex: 1; }
.plan ul li { padding: 6px 0 6px 24px; position: relative; font-size: .92rem; }
.plan ul li::before { content: "✓"; position: absolute; left: 0; color: var(--good); font-weight: 800; }
.plan .btn { width: 100%; text-align: center; }
.addons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.addon { background: #fff; border: 1px dashed var(--line); border-radius: var(--radius); padding: 18px; }
.addon .price { font-weight: 800; color: var(--ink); }

/* table */
.compare { width: 100%; border-collapse: collapse; font-size: .94rem; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.compare th, .compare td { padding: 12px 14px; text-align: center; border-bottom: 1px solid var(--line); }
.compare th:first-child, .compare td:first-child { text-align: left; }
.compare thead th { background: var(--paper2); color: var(--ink); }
.compare .yes { color: var(--good); font-weight: 700; }
.compare .no { color: var(--line); }

/* enterprise */
.steps { counter-reset: s; display: grid; gap: 14px; }
.steps .s { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 18px 60px; position: relative; }
.steps .s::before { counter-increment: s; content: counter(s); position: absolute; left: 16px; top: 16px; width: 30px; height: 30px; border-radius: 50%; background: var(--ai-soft); color: var(--ai); font-weight: 800; display: grid; place-items: center; }
.note { background: var(--sakura-soft); border-left: 4px solid var(--sakura); padding: 14px 18px; border-radius: 8px; font-size: .95rem; }
.feature-note { background: var(--ai-soft); border: 1px solid var(--line); border-left: 4px solid var(--ai); padding: 16px 20px; border-radius: 10px; font-size: .95rem; color: var(--body); }
.feature-note strong { color: var(--ai-deep); }

/* contact stub */
.form { display: grid; gap: 14px; max-width: 560px; }
.form label { font-weight: 600; font-size: .9rem; color: var(--ink); }
.form input, .form select, .form textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  font: inherit; color: var(--ink); background: #fff;
}
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* footer */
.site-footer { background: var(--ink); color: #c8cce0; padding: 56px 0 28px; }
.site-footer a { color: #c8cce0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px; }
.footer-grid h4 { color: #fff; font-size: .9rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 12px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin: 7px 0; font-size: .94rem; }
.footer-bottom { border-top: 1px solid #2a2f49; margin-top: 36px; padding-top: 20px; font-size: .85rem; color: #8a8fac; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

.proto-ribbon { background: var(--ai-deep); color: #fff; text-align: center; font-size: .82rem; padding: 6px; letter-spacing: .02em; }

/* legal / long-form content */
.legal { max-width: 780px; margin: 0 auto; }
.legal h2 { font-size: 1.4rem; margin-top: 44px; scroll-margin-top: 84px; }
.legal h2:first-of-type { margin-top: 0; }
.legal h3 { font-size: 1.05rem; margin-top: 26px; }
.legal p, .legal li { color: var(--body); }
.legal ul { padding-left: 20px; }
.legal li { margin: 6px 0; }
.legal .updated { color: var(--muted); font-size: .9rem; margin-top: 0; }
.legal .toc { background: var(--paper2); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; margin: 32px 0 40px; }
.legal .toc strong { color: var(--ink); }
.legal .toc ul { list-style: none; padding: 0; margin: 10px 0 0; columns: 2; column-gap: 28px; }
.legal .toc li { margin: 5px 0; font-size: .95rem; }

@media (max-width: 900px) {
  .nav { display: none; }
  .nav-toggle { display: block; }
  .nav.open { display: flex; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; background: #fff; padding: 16px 24px; border-bottom: 1px solid var(--line); }
  .loop, .cards, .cards.duo, .audience, .plans, .footer-grid, .addons, .form .row { grid-template-columns: 1fr; }
  .legal .toc ul { columns: 1; }
  .callout { padding: 32px 20px; }
}