/* アプリのサポート — 外部の読み込みなし（フォント・スクリプト・解析を使わない） */
:root {
  color-scheme: light;
  --bg: #f6f6f3;
  --card: #ffffff;
  --ink: #1c1c1e;
  --sub: #66666b;
  --line: #e6e5e0;
  --accent: #1f8a5b;
  --accent-ink: #ffffff;
  --accent-soft: #e5f3ec;
  --warn-soft: #fbf1de;
  --warn: #8a5300;
  --focus: #2a78d6;
  --shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 6px 20px rgba(0, 0, 0, .05);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111113;
    --card: #1c1c1e;
    --ink: #f2f2f2;
    --sub: #a1a1a6;
    --line: #2c2c2e;
    --accent: #4cc38a;
    --accent-ink: #0b0b0b;
    --accent-soft: #17352a;
    --warn-soft: #3a2d17;
    --warn: #f0b35a;
    --focus: #6da7ec;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--bg); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 6px;
}
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--card); padding: 8px 12px; z-index: 2; }

.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header.site { padding: 20px 0 8px; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
nav.top { display: flex; gap: 4px; flex-wrap: wrap; }
nav.top a { color: var(--sub); text-decoration: none; font-size: 14px; padding: 6px 12px; border-radius: 999px; }
nav.top a[aria-current="page"], nav.top a:hover { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

main { padding: 8px 0 48px; }
.hero { padding: 24px 0 8px; }
.eyebrow { color: var(--sub); font-size: 13px; letter-spacing: .04em; margin: 0; }
h1 { font-size: 28px; line-height: 1.35; margin: 4px 0 8px; letter-spacing: .01em; }
.lead { color: var(--sub); margin: 0; max-width: 36em; }
h2 { font-size: 19px; line-height: 1.5; margin: 0 0 8px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p { margin: 8px 0; }
ul, ol { padding-left: 1.3em; margin: 8px 0; }
li { margin: 4px 0; }
small, .note { color: var(--sub); font-size: 13px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px 22px;
  margin: 16px 0;
  box-shadow: var(--shadow);
}
.card.soft { background: var(--accent-soft); border-color: transparent; box-shadow: none; }
.card.warn { background: var(--warn-soft); border-color: transparent; box-shadow: none; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.grid .card { margin: 0; }
.app { display: flex; gap: 16px; align-items: flex-start; }
.app img { width: 64px; height: 64px; border-radius: 15px; flex: none; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 600;
  border: 0; border-radius: 12px; padding: 12px 20px; font-size: 16px; cursor: pointer; min-height: 44px;
}
.btn.ghost { background: transparent; color: var(--accent); border: 1.5px solid var(--accent); }
.facts { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 10px; }
.facts li { display: grid; grid-template-columns: 1.6em 1fr; gap: 4px; margin: 0; }
.facts li::before { content: "✓"; color: var(--accent); font-weight: 700; }

details { border-top: 1px solid var(--line); padding: 12px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "＋"; color: var(--sub); font-weight: 400; }
details[open] summary::after { content: "－"; }
details > div { color: var(--ink); padding-top: 4px; }

.policy h2 { margin-top: 28px; padding-top: 8px; border-top: 1px solid var(--line); }
.policy h2:first-of-type { border-top: 0; margin-top: 8px; }
.toc { columns: 2; column-gap: 24px; font-size: 14px; }
.toc li { break-inside: avoid; }

form { display: grid; gap: 18px; }
label { display: grid; gap: 6px; font-weight: 600; font-size: 15px; }
label .hint { font-weight: 400; color: var(--sub); font-size: 13px; }
.req { color: var(--warn); font-size: 12px; font-weight: 600; margin-left: 6px; }
input, select, textarea {
  font: inherit; color: var(--ink); background: var(--bg);
  border: 1.5px solid var(--line); border-radius: 12px; padding: 12px 14px; width: 100%; min-height: 48px;
}
textarea { min-height: 180px; resize: vertical; line-height: 1.7; }
fieldset { border: 0; padding: 0; margin: 0; }
.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.check input { width: 22px; height: 22px; min-height: 0; margin-top: 3px; flex: none; accent-color: var(--accent); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

footer.site { border-top: 1px solid var(--line); padding: 20px 0 40px; color: var(--sub); font-size: 13px; }
footer.site nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }
footer.site a { color: var(--sub); }

@media (max-width: 600px) {
  h1 { font-size: 24px; }
  .grid { grid-template-columns: 1fr; }
  .card { padding: 18px 16px; border-radius: 16px; }
  .toc { columns: 1; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto; } }
@media print { header.site nav, footer.site nav, .btn { display: none; } body { background: #fff; } .card { box-shadow: none; } }

/* アプリのタブ・サポートとポリシーの切り替え */
.brand { font-size: 16px; }
.apptabs { display: flex; gap: 6px; overflow-x: auto; padding: 4px 2px 10px; margin: 8px -2px 0; scrollbar-width: none; }
.apptabs::-webkit-scrollbar { display: none; }
.apptabs a {
  flex: none; display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px 6px 6px;
  border-radius: 999px; text-decoration: none; color: var(--sub); font-size: 14px; border: 1px solid var(--line); background: var(--card);
}
.apptabs a[aria-current="page"] { color: var(--ink); font-weight: 600; border-color: var(--accent); box-shadow: var(--shadow); }
.segs { display: inline-flex; gap: 2px; padding: 3px; margin: 6px 0 0; background: var(--line); border-radius: 12px; }
.segs a { padding: 6px 16px; border-radius: 9px; text-decoration: none; color: var(--sub); font-size: 14px; }
.segs a[aria-current="page"] { background: var(--card); color: var(--ink); font-weight: 600; box-shadow: var(--shadow); }

.appicon { display: inline-block; width: 64px; height: 64px; border-radius: 22.5%; flex: none; object-fit: cover; }
.appicon.s22 { width: 22px; height: 22px; font-size: 12px; }
.appicon.s64 { width: 64px; height: 64px; font-size: 28px; }
.appicon.s72 { width: 72px; height: 72px; font-size: 32px; }
img.appicon[width="22"] { width: 22px; height: 22px; }
img.appicon[width="72"] { width: 72px; height: 72px; }
.tile { display: inline-grid; place-items: center; color: #fff; font-weight: 700; line-height: 1; }
.t-ureta { background: linear-gradient(135deg, #2ac58a, #138a5c); }
.t-keepdictation { background: linear-gradient(135deg, #5b8ff0, #2b56b8); }
.t-runlens { background: linear-gradient(135deg, #2fd0e0, #0a7f94); }
.t-physics { background: linear-gradient(135deg, #8a7cf0, #4a3aa7); }

.apphero { display: flex; gap: 16px; align-items: center; padding: 18px 0 4px; }
.apphero h1 { margin: 0 0 4px; }
.badge { display: inline-block; font-size: 12px; line-height: 1.7; padding: 0 10px; border-radius: 999px; background: var(--line); color: var(--sub); }
.badge.live { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.apps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 16px 0; }
.appcard { display: flex; gap: 14px; align-items: flex-start; margin: 0; color: var(--ink); text-decoration: none; transition: transform .15s ease; }
.appcard:hover { transform: translateY(-1px); }
.appcard h2 { margin: 0 0 4px; font-size: 17px; }
.appcard p { margin: 8px 0 0; color: var(--sub); font-size: 14px; line-height: 1.7; }
@media (max-width: 600px) { .apps { grid-template-columns: 1fr; } .apphero { gap: 12px; } }
@media (prefers-reduced-motion: reduce) { .appcard { transition: none; } }