/* きこえる地図プロジェクト 公式サイト — 角丸・シンプル */

:root {
  --accent: #1ab3a0;
  --accent-strong: #0f8a7b;
  --accent-soft: #e3f6f3;
  --accent-contrast: #ffffff;
  --blue: #1a8cff;
  --bg: #ffffff;
  --bg-alt: #f3f7f6;
  --surface: #ffffff;
  --text: #1c2326;
  --muted: #5a6468;
  --border: #dde5e3;
  --code-bg: #f1f4f3;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #3cc9b6;
    --accent-strong: #3cc9b6;
    --accent-soft: #173a36;
    --accent-contrast: #06201d;
    --bg: #111618;
    --bg-alt: #172023;
    --surface: #1b2427;
    --text: #e8eeec;
    --muted: #a2afb3;
    --border: #2c393d;
    --code-bg: #0c1113;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --accent: #3cc9b6;
  --accent-strong: #3cc9b6;
  --accent-soft: #173a36;
  --accent-contrast: #06201d;
  --bg: #111618;
  --bg-alt: #172023;
  --surface: #1b2427;
  --text: #e8eeec;
  --muted: #a2afb3;
  --border: #2c393d;
  --code-bg: #0c1113;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.85;
  -webkit-text-size-adjust: 100%;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent-strong);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  left: 8px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}
.narrow {
  max-width: 780px;
}
.center {
  text-align: center;
}
.muted {
  color: var(--muted);
}

/* ---------------------------------------------------------------- ヘッダー */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 68px;
}
.header-logo {
  flex-shrink: 0;
}
.header-logo img {
  display: block;
  width: 150px;
}
.header-nav {
  display: flex;
  gap: 2px;
  margin-left: auto;
}
.header-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  white-space: nowrap;
}
.header-nav a:hover {
  background: var(--bg-alt);
}
.header-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
}
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  flex-shrink: 0;
}
.icon-button:hover {
  border-color: var(--accent);
}
.icon-button svg {
  width: 20px;
  height: 20px;
}
.menu-button {
  display: none;
}

/* ダークモードでもロゴの文字が読めるよう、ロゴの背後にだけ明るい面を敷く */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-plate {
    background: #ffffff;
    border-radius: var(--radius-sm);
    padding: 4px 8px;
  }
}
:root[data-theme="dark"] .logo-plate {
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 4px 8px;
}

@media (max-width: 900px) {
  .menu-button {
    display: inline-flex;
    margin-left: auto;
  }
  .header-nav {
    display: none;
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% + 8px);
    flex-direction: column;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }
  .header-nav.is-open {
    display: flex;
  }
  .header-nav a {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
  }
  .site-header .container {
    position: relative;
  }
}

/* ---------------------------------------------------------------- ボタン */

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.center .actions,
.hero .actions {
  justify-content: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 24px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover {
  border-color: var(--accent);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

/* ---------------------------------------------------------------- ヒーロー・ページ見出し */

.hero {
  padding: 80px 0 72px;
  text-align: center;
}
.hero-icon {
  width: 128px;
  height: 128px;
}
.hero h1 {
  font-size: clamp(30px, 6vw, 50px);
  line-height: 1.3;
  margin: 16px 0 12px;
  letter-spacing: 0.02em;
}
.lead {
  max-width: 660px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 17px;
}
.page-hero {
  padding: 56px 0 40px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.page-hero .eyebrow {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-strong);
  letter-spacing: 0.08em;
}
.page-hero h1 {
  margin: 4px 0 8px;
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1.35;
}
.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 680px;
}

/* ---------------------------------------------------------------- セクション */

.section {
  padding: 64px 0;
}
.section-alt {
  background: var(--bg-alt);
}
.section h2 {
  font-size: 26px;
  line-height: 1.4;
  margin: 0 0 20px;
}
.section h3 {
  font-size: 19px;
  margin: 32px 0 8px;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.section-head h2 {
  margin: 0;
}
.more-link {
  font-weight: 700;
  text-decoration: none;
}
.more-link::after {
  content: " →";
}

.cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.card h3 {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--accent-strong);
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}
a.card {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s;
}
a.card:hover {
  border-color: var(--accent);
}
.card-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  margin-bottom: 8px;
}

.list {
  padding-left: 1.3em;
}
.list li + li {
  margin-top: 6px;
}

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 20px 52px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.steps li strong {
  display: block;
}

.callout {
  border-radius: var(--radius);
  background: var(--accent-soft);
  padding: 18px 22px;
  margin: 24px 0;
}
.callout p {
  margin: 0;
}
.callout p + p {
  margin-top: 8px;
}

.feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
}
.feature:first-of-type {
  border-top: 0;
}
.feature h2 {
  margin: 0;
  font-size: 23px;
}
.feature .tagline {
  margin: 0;
  color: var(--accent-strong);
  font-weight: 700;
}
@media (min-width: 820px) {
  .feature {
    grid-template-columns: 260px 1fr;
    gap: 32px;
  }
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
th,
td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
tr:last-child td {
  border-bottom: 0;
}
th {
  background: var(--bg-alt);
}

/* ---------------------------------------------------------------- コード */

code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 6px;
}
.code {
  position: relative;
  margin: 16px 0;
}
.code pre {
  margin: 0;
  padding: 16px 18px;
  padding-right: 88px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.7;
}
.code pre code {
  background: transparent;
  padding: 0;
}
.copy-button {
  position: absolute;
  top: 8px;
  right: 8px;
  min-height: 32px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.copy-button:hover {
  border-color: var(--accent);
}

/* ---------------------------------------------------------------- 目次 */

.with-toc {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.toc {
  display: none;
}
@media (min-width: 1000px) {
  .with-toc {
    grid-template-columns: minmax(0, 1fr) 220px;
  }
  .toc {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    font-size: 14px;
  }
  .toc p {
    margin: 0 0 8px;
    font-weight: 700;
  }
  .toc ol {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 2px solid var(--border);
  }
  .toc a {
    display: block;
    padding: 4px 12px;
    margin-left: -2px;
    border-left: 2px solid transparent;
    color: var(--muted);
    text-decoration: none;
  }
  .toc a.is-active {
    color: var(--accent-strong);
    border-left-color: var(--accent);
    font-weight: 700;
  }
}

/* ---------------------------------------------------------------- FAQ */

.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0 22px;
}
.faq details + details {
  margin-top: 12px;
}
.faq summary {
  cursor: pointer;
  padding: 16px 0;
  font-weight: 700;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::after {
  content: "+";
  color: var(--accent-strong);
  font-size: 20px;
  line-height: 1;
}
.faq details[open] summary::after {
  content: "−";
}
.faq details > div {
  padding-bottom: 16px;
  color: var(--muted);
}
.faq details > div p {
  margin: 0 0 8px;
}
.faq-heading {
  margin-top: 48px !important;
}

/* ---------------------------------------------------------------- リポジトリ・スポンサー */

.repo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s;
}
.repo:hover {
  border-color: var(--accent);
}
.repo-label {
  font-size: 13px;
  color: var(--muted);
}
.repo-name {
  font-weight: 700;
  font-family: var(--mono);
  word-break: break-all;
}

.sponsor {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  min-width: min(420px, 100%);
  padding: 28px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s;
}
.sponsor:hover {
  border-color: var(--accent);
}
.sponsor-logo {
  display: block;
  width: 260px;
  max-width: 100%;
  min-height: 48px;
  object-fit: contain;
}
.sponsor-small .sponsor-logo {
  width: 180px;
}
.sponsor-small {
  padding: 20px 24px;
}
.sponsor-tier {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-strong);
  letter-spacing: 0.08em;
}
.sponsor-url {
  font-size: 13px;
  color: var(--muted);
}

/* ---------------------------------------------------------------- フッター */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  background: var(--bg-alt);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
@media (min-width: 760px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }
}
.logo-plate {
  display: inline-block;
}
.header-logo.logo-plate {
  display: block;
}
.footer-brand img {
  display: block;
  width: 160px;
}
.footer-brand p {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--muted);
}
.footer-col h2 {
  font-size: 14px;
  margin: 0 0 8px;
}
.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}
.footer-col li + li {
  margin-top: 4px;
}
.footer-col a {
  color: var(--muted);
  text-decoration: none;
}
.footer-col a:hover {
  color: var(--accent-strong);
}
.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}
.footer-bottom p {
  margin: 0;
}

@media (max-width: 640px) {
  .hero {
    padding: 52px 0 48px;
  }
  .section {
    padding: 48px 0;
  }
  .page-hero {
    padding: 40px 0 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  a.card,
  .repo,
  .sponsor {
    transition: none;
  }
}