/* イエバコ公式サイト スタイル
   アプリ本体の Sleek デザインと統一: accent #7F77DD, bg #FBF8F4 */

:root {
  --color-bg: #FBF8F4;
  --color-bg-soft: #F2EEEA;
  --color-surface: #FFFFFF;
  --color-text-primary: #2A2A2A;
  --color-text-secondary: #5A5A5A;
  --color-text-tertiary: #888888;
  --color-border: #E5E1DC;
  --color-accent: #7F77DD;
  --color-accent-soft: #EEEDFE;
  --color-accent-strong: #5A52B8;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1A1A20;
    --color-bg-soft: #232329;
    --color-surface: #2A2A32;
    --color-text-primary: #F5F2EC;
    --color-text-secondary: #B8B4AC;
    --color-text-tertiary: #888470;
    --color-border: #3A3A42;
    --color-accent: #9B94E8;
    --color-accent-soft: #3C3489;
    --color-accent-strong: #B5AFEE;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--color-accent-strong); text-decoration: underline; }

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

/* レイアウト */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: 17px;
}
.brand img { width: 32px; height: 32px; border-radius: 7px; }
.nav { display: flex; gap: 18px; flex-wrap: wrap; }
.nav a {
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
}
.nav a:hover { color: var(--color-accent); text-decoration: none; }

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

main {
  padding: 48px 0 96px;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
  margin-top: 64px;
  color: var(--color-text-tertiary);
  font-size: 14px;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
}
.site-footer .nav a { font-size: 13px; }

/* タイポグラフィ */
h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 40px 0 12px;
  letter-spacing: -0.005em;
}
h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }
li { margin: 4px 0; }

.lead {
  color: var(--color-text-secondary);
  font-size: 17px;
  margin-bottom: 24px;
}

.meta {
  color: var(--color-text-tertiary);
  font-size: 13px;
  margin-bottom: 32px;
}

hr {
  border: 0;
  height: 1px;
  background: var(--color-border);
  margin: 32px 0;
}

/* ボタン・カード */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: all 0.15s ease;
}
.btn:hover {
  background: var(--color-accent-strong);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--color-bg-soft);
  color: var(--color-text-primary);
}
.btn-secondary:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 16px 0;
}

.note {
  background: var(--color-accent-soft);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 15px;
  color: var(--color-text-primary);
  margin: 16px 0;
}

/* FAQ */
details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin: 8px 0;
}
details > summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-primary);
  padding: 4px 0;
  list-style: none;
  position: relative;
  padding-left: 22px;
}
details > summary::-webkit-details-marker { display: none; }
details > summary::before {
  content: "▶";
  position: absolute;
  left: 0;
  font-size: 11px;
  transition: transform 0.15s ease;
  color: var(--color-accent);
}
details[open] > summary::before {
  transform: rotate(90deg);
}
details > div, details > p {
  padding-top: 8px;
  color: var(--color-text-secondary);
}

/* フォーム埋め込み */
.form-embed {
  width: 100%;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  margin: 24px 0;
}

/* ランディング */
.hero {
  text-align: center;
  padding: 64px 0 48px;
}
.hero img.app-icon {
  width: 120px;
  height: 120px;
  border-radius: 27px;
  box-shadow: 0 8px 24px rgba(127, 119, 221, 0.18);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 40px;
  margin-bottom: 12px;
}
.hero .lead {
  font-size: 19px;
  max-width: 520px;
  margin: 0 auto 32px;
}

@media (max-width: 600px) {
  .container { padding: 0 20px; }
  h1 { font-size: 26px; }
  .hero h1 { font-size: 30px; }
  .hero img.app-icon { width: 96px; height: 96px; border-radius: 22px; }
  .nav { gap: 12px; }
  .nav a { font-size: 13px; }
  main { padding: 32px 0 64px; }
}