/* イエタ 紹介サイト（静的ページ）の共通スタイル。アプリ本体は /app/（Flutter） */
:root {
  --primary: #1976d2;
  --primary-strong: #0d47a1;
  --primary-soft: #e3f2fd;
  --accent: #2e7d32;
  --accent-soft: #e8f5e9;
  --warn-soft: #fff3e0;
  --text: #1f2933;
  --muted: #5f6b7a;
  --line: #dde3ea;
  --bg: #f7f9fc;
  --card: #ffffff;
  --radius: 14px;
  --max: 1040px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --primary: #64b5f6;
    --primary-strong: #90caf9;
    --primary-soft: #16263a;
    --accent: #81c784;
    --accent-soft: #15291a;
    --warn-soft: #2e2416;
    --text: #e6ebf1;
    --muted: #a3afbd;
    --line: #2c3540;
    --bg: #0f141a;
    --card: #161d25;
  }
}
:root[data-theme="dark"] {
  --primary: #64b5f6;
  --primary-strong: #90caf9;
  --primary-soft: #16263a;
  --accent: #81c784;
  --accent-soft: #15291a;
  --warn-soft: #2e2416;
  --text: #e6ebf1;
  --muted: #a3afbd;
  --line: #2c3540;
  --bg: #0f141a;
  --card: #161d25;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
a { color: var(--primary); }
img { max-width: 100%; height: auto; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* ヘッダー */
.site-header { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(6px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 16px; min-height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); text-decoration: none; font-size: 18px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.site-nav { margin-left: auto; display: flex; gap: 16px; align-items: center; }
.site-nav a.link { color: var(--muted); text-decoration: none; font-size: 14px; }
.site-nav a.link:hover { color: var(--text); }
@media (max-width: 640px) { .site-nav a.link { display: none; } }

/* ボタン */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 22px; border-radius: 999px; font-weight: 700; text-decoration: none; border: 2px solid transparent; font-size: 16px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-strong); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn-primary { color: #0f141a; } }
:root[data-theme="dark"] .btn-primary { color: #0f141a; }
.btn-ghost { border-color: var(--line); color: var(--text); background: var(--card); }
.btn-small { padding: 8px 16px; font-size: 14px; }

/* セクション */
section { padding: 56px 0; }
section + section { border-top: 1px solid var(--line); }
h1, h2, h3 { line-height: 1.4; }
h2 { font-size: 26px; margin: 0 0 8px; }
.section-lead { color: var(--muted); margin: 0 0 28px; }
.hero { padding: 64px 0 48px; }
.hero .eyebrow { display: inline-block; font-weight: 700; color: var(--primary); background: var(--primary-soft); border-radius: 999px; padding: 4px 14px; margin: 0 0 14px; font-size: 15px; }
.hero h1 { font-size: clamp(30px, 6vw, 46px); margin: 0 0 16px; letter-spacing: 0.01em; }
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0 0 28px; max-width: 640px; }
.hero .cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero .note { font-size: 13px; color: var(--muted); margin-top: 12px; }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.step-num { display: inline-flex; width: 28px; height: 28px; border-radius: 50%; align-items: center; justify-content: center; background: var(--primary-soft); color: var(--primary); font-weight: 700; font-size: 14px; margin-bottom: 8px; }

table.compare { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); font-size: 15px; }
table.compare th, table.compare td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.compare thead th { background: var(--primary-soft); font-size: 14px; }
table.compare tr:last-child td { border-bottom: 0; }
.table-scroll { overflow-x: auto; }

.scene-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.scene-groups h3 { font-size: 16px; margin: 0 0 8px; }
.scene-groups ul { list-style: none; margin: 0; padding: 0; }
.scene-groups li { padding: 6px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.scene-groups li:last-child { border-bottom: 0; }
.tag { display: inline-block; font-size: 12px; padding: 0 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); margin-left: 6px; vertical-align: 1px; }

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.plan .price { font-size: 28px; font-weight: 700; margin: 4px 0 8px; }
.plan ul { margin: 0; padding-left: 20px; color: var(--muted); font-size: 15px; }
.plan.featured { border-color: var(--primary); }
.badge-soon { display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px; background: var(--warn-soft); color: var(--muted); }

details { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 10px; }
details summary { cursor: pointer; font-weight: 700; }
details p { margin: 10px 0 0; color: var(--muted); }

.site-footer { padding: 32px 0 48px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 8px; }
.site-footer a { color: var(--muted); }

/* シーン別ページ */
.breadcrumb { font-size: 13px; color: var(--muted); margin: 20px 0 0; }
.breadcrumb a { color: var(--muted); }
.scene-hero { padding: 24px 0 32px; }
.scene-hero h1 { font-size: clamp(26px, 5vw, 36px); margin: 8px 0 12px; }
.scene-meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--muted); }
.scene-meta span { background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; }
.practice-box { background: var(--primary-soft); border-radius: var(--radius); padding: 20px; margin: 24px 0; }
.practice-box p { margin: 0 0 12px; }
.phrases { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.phrases li { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.phrases .en { font-weight: 700; font-size: 17px; }
.phrases .ja { color: var(--muted); font-size: 14px; }
.phrases .note { font-size: 13px; color: var(--muted); margin-top: 4px; }
.dialogue { display: grid; gap: 10px; }
.line { display: grid; grid-template-columns: 72px 1fr; gap: 10px; align-items: start; }
.line .who { font-size: 12px; color: var(--muted); padding-top: 4px; }
.line .bubble { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; }
.line.you .bubble { background: var(--primary-soft); border-color: transparent; }
.line .bubble .ja { display: block; color: var(--muted); font-size: 13px; }
.mistakes { display: grid; gap: 10px; }
.mistake { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.mistake .ng { color: #c62828; text-decoration: line-through; }
.mistake .ok { color: var(--accent); font-weight: 700; }
.mistake p { margin: 4px 0 0; font-size: 14px; color: var(--muted); }
.related { display: flex; flex-wrap: wrap; gap: 8px; }
.related a { background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 14px; text-decoration: none; }
@media (max-width: 640px) { .line { grid-template-columns: 40px 1fr; gap: 6px; } section { padding: 40px 0; } }