:root {
  --bg: #ffffff;
  --bg-alt: #f5f6fb;
  --text: #1c1f2b;
  --muted: #5b6072;
  --line: #e2e4ee;
  --brand: #4338ca;
  --brand-strong: #3730a3;
  --brand-soft: #eef0ff;
  --on-brand: #ffffff;
  --accent: #e2574c;
  --warn-bg: #fff6e5;
  --warn-line: #f2c46b;
  --card: #ffffff;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141c;
    --bg-alt: #191c27;
    --text: #eceef6;
    --muted: #a5aabd;
    --line: #2d3142;
    --brand: #8b8cf8;
    --brand-strong: #a5a6ff;
    --brand-soft: #23264a;
    --on-brand: #12141c;
    --accent: #ff8a7f;
    --warn-bg: #2b2414;
    --warn-line: #7a6026;
    --card: #1d2030;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: anywhere;
}
a { color: var(--brand); }
h1, h2, h3 { line-height: 1.4; margin: 0 0 .6em; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.08rem; }
p { margin: 0 0 1em; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: var(--bg); padding: 8px; z-index: 10; }

/* header */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top-inner { display: flex; align-items: center; gap: 12px; height: 60px; }
.logo { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.25rem; color: var(--text); text-decoration: none; letter-spacing: .02em; }
.logo-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: var(--brand); color: var(--on-brand); font-size: 1.1rem; }
.top-nav { display: none; margin-left: auto; gap: 20px; }
.top-nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.top-nav a:hover { color: var(--text); }
.top .btn { margin-left: auto; }
@media (min-width: 720px) { .top-nav { display: flex; } .top .btn { margin-left: 8px; } }

/* buttons */
.btn { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: 10px 20px; border-radius: 999px; background: var(--brand); color: var(--on-brand); font-weight: 700; text-decoration: none; border: 2px solid var(--brand); transition: background .15s; text-align: center; }
.btn:hover { background: var(--brand-strong); border-color: var(--brand-strong); }
.btn:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.btn-sm { min-height: 38px; padding: 6px 14px; font-size: .9rem; }
.btn-lg { min-height: 52px; padding: 12px 26px; font-size: 1.05rem; }
.btn-ghost { background: transparent; color: var(--brand); }
.btn-ghost:hover { background: var(--brand-soft); color: var(--brand); }
.btn-block { display: flex; width: 100%; }
.btn[aria-disabled="true"] { background: var(--line); border-color: var(--line); color: var(--muted); pointer-events: none; }

/* hero */
.hero { padding: 44px 0 40px; background: linear-gradient(180deg, var(--brand-soft), var(--bg)); }
.badge { display: inline-block; padding: 4px 12px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); font-size: .85rem; font-weight: 700; color: var(--brand); }
.hero h1 { font-size: clamp(1.75rem, 6.4vw, 2.9rem); margin-top: 16px; }
.lead { font-size: 1.05rem; color: var(--muted); max-width: 640px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0 10px; }
.hero-cta .btn { flex: 1 1 220px; }
@media (min-width: 720px) { .hero-cta .btn { flex: 0 0 auto; } }
.fineprint { font-size: .85rem; color: var(--muted); }
.consent-strip { margin-top: 20px; padding: 12px 16px; border-left: 4px solid var(--accent); background: var(--card); border-radius: 8px; font-size: .95rem; }
.consent-strip strong { display: block; }

/* sections */
.section { padding: 52px 0; }
.section-alt { background: var(--bg-alt); }
.section-lead { color: var(--muted); max-width: 720px; }
.note { font-size: .88rem; color: var(--muted); margin-top: 16px; }
.sub { margin-top: 28px; }

.steps { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 14px; }
@media (min-width: 720px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.steps li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.steps p { color: var(--muted); font-size: .94rem; margin: 0; }
.step-no { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--brand); color: var(--on-brand); font-weight: 800; margin-bottom: 8px; }

.diagram { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; margin: 28px 0 0; padding: 18px; border: 1px dashed var(--line); border-radius: var(--radius); }
.dg-box { padding: 10px 16px; border-radius: 10px; background: var(--brand-soft); font-weight: 700; text-align: center; }
.dg-box small { display: block; font-weight: 400; font-size: .75rem; color: var(--muted); }
.dg-out { background: var(--brand); color: var(--on-brand); }
.dg-plus, .dg-arrow { font-size: 1.3rem; color: var(--muted); }
@media (max-width: 559px) {
  .diagram { flex-direction: column; }
  .dg-box { width: 100%; max-width: 260px; }
  .dg-arrow { transform: rotate(90deg); }
}

.cards { display: grid; gap: 14px; margin-top: 20px; }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

/* pricing */
.plans { display: grid; gap: 16px; margin: 24px 0; }
@media (min-width: 720px) { .plans { grid-template-columns: repeat(2, 1fr); max-width: 860px; } }
.plan { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 20px; display: flex; flex-direction: column; }
.plan-pro { border: 2px solid var(--brand); }
.plan-tag { position: absolute; top: -13px; right: 16px; margin: 0; padding: 2px 10px; border-radius: 999px; background: var(--brand); color: var(--on-brand); font-size: .78rem; font-weight: 700; }
.plan h3 { font-size: 1.35rem; margin-bottom: 2px; }
.plan-fit { color: var(--muted); font-size: .9rem; }
.price { font-size: 2.3rem; font-weight: 800; margin: 4px 0 10px; line-height: 1.2; }
.price .yen { font-size: 1.3rem; margin-right: 2px; }
.price .per { font-size: .9rem; font-weight: 400; color: var(--muted); margin-left: 4px; }
.plan-list { padding-left: 1.2em; margin: 0 0 20px; flex: 1; }
.note-list { padding-left: 1.2em; color: var(--muted); font-size: .94rem; }
.note-list li + li, .ng-list li + li { margin-top: 4px; }

.consent-box { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: var(--radius); padding: 18px 20px; }
.consent-box p { margin: 0; }
.ng-list { padding-left: 1.2em; }
.ng-list li::marker { content: "✕  "; color: var(--accent); }

.register-grid { display: grid; gap: 20px; margin-top: 10px; }
@media (min-width: 720px) { .register-grid { grid-template-columns: 1fr 1fr; align-items: start; } }
.register-cta { background: var(--brand-soft); border-radius: var(--radius); padding: 22px; }
.pending { margin: 12px 0 0; font-size: .88rem; color: var(--accent); font-weight: 700; }

.privacy dt { font-weight: 700; margin-top: 16px; }
.privacy dd { margin: 4px 0 0; color: var(--muted); font-size: .95rem; }

details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: 10px 0 0; color: var(--muted); }

.final-cta { text-align: center; background: var(--brand-soft); }
.final-cta p { color: var(--muted); }

.foot { padding: 32px 0 40px; border-top: 1px solid var(--line); font-size: .85rem; color: var(--muted); }
.logo-foot { font-size: 1.05rem; }
.copy { margin-top: 12px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 18px; }

/* apply page */
.apply { padding-top: 12px; }
.apply-title { font-size: 1.45rem; }
.apply .btn { margin: 12px 0 18px; }
.apply-notes { margin-top: 18px; }