:root {
  --bg: #f7fbff;
  --bg-grad-top: #e0f2fe;
  --bg-grad-bottom: #f8fbff;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #dbeafe;
  --primary: #2563eb;
  --primary-soft: #dbeafe;
  --primary-soft-2: #eff6ff;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --radius: 16px;
  --max: 640px;
  --nav-height: 86px;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-grad-top) 0%, var(--bg-grad-bottom) 100%);
}

img {
  display: block;
  max-width: 100%;
}

button,
input,
textarea {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  padding-bottom: calc(var(--nav-height) + env(safe-area-inset-bottom) + 18px);
}

/* ===== ヘッダー ===== */
.site-header {
  padding: 16px 14px;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid #cfe4ff;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo {
  flex-shrink: 0;
}

.site-logo img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 16px;
}

.header-text {
  min-width: 0;
}

.header-text h1 {
  margin: 0 0 4px;
  font-size: 1.4rem;
  line-height: 1.35;
}

.header-text .lead {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: #4b5563;
}

/* ===== コンテナ ===== */
.container {
  max-width: var(--max);
  margin: 16px auto 0;
  padding: 0 12px 24px;
}

/* ===== カード ===== */
.card {
  background: var(--card);
  border: 1px solid rgba(191, 219, 254, 0.9);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.label {
  margin: 0 0 10px;
  font-size: 0.85rem;
  font-weight: 800;
  color: #0369a1;
  letter-spacing: 0.01em;
}

/* ===== ボタングリッド ===== */
.action-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 12px 0 14px;
}

.action-btn {
  appearance: none;
  border: none;
  border-radius: 14px;
  padding: 14px 12px;
  font-size: 14px;
  font-weight: 800;
  color: #1d4ed8;
  background: var(--primary-soft);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.08);
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.action-btn:hover {
  background: #bfdbfe;
}

.action-btn:active {
  transform: scale(0.97);
}

.action-btn:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.22);
  outline-offset: 2px;
}

.action-btn.is-active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 10px 18px rgba(37, 99, 235, 0.22);
}

/* ===== 結果表示 ===== */
.action-result {
  min-height: 120px;
  margin-top: 14px;
  padding: 14px;
  border-radius: 14px;
  background: var(--primary-soft-2);
  border: 1px solid #cfe4ff;
  font-size: 14px;
  line-height: 1.8;
  color: #0f172a;
}

/* ===== リスト ===== */
.advice-list {
  margin: 4px 0 0;
  padding-left: 1.2rem;
  font-size: 0.92rem;
  line-height: 1.8;
}

.advice-list li {
  margin-bottom: 6px;
}

/* ===== 注意 ===== */
.note {
  margin-top: 16px;
  padding: 14px;
  background: #f0f9ff;
  border: 1px solid #d9ecff;
  border-radius: 14px;
  font-size: 0.88rem;
  line-height: 1.8;
  color: #0f172a;
}

.note h2 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.4;
}

/* ===== 下部ナビ ===== */
.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.94);
  border-top: 1px solid rgba(59, 130, 246, 0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 -8px 24px rgba(15, 23, 42, 0.06);
}

.nav-item {
  min-height: 58px;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-decoration: none;
  color: #64748b;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.nav-item:visited,
.nav-item:hover,
.nav-item:active {
  text-decoration: none;
}

.nav-item.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 800;
}

.nav-item:active {
  transform: scale(0.97);
}

.nav-icon {
  font-size: 20px;
  line-height: 1;
}

.nav-text {
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.01em;
}

/* ===== フッター ===== */
.site-footer {
  text-align: center;
  font-size: 0.75rem;
  color: #667085;
  padding: 8px 0 18px;
}

/* ===== スマホ ===== */
@media (max-width: 480px) {
  .site-header {
    padding: 14px 12px;
  }

  .header-inner {
    gap: 10px;
    align-items: center;
  }

  .site-logo img {
    width: 52px;
    height: 52px;
  }

  .header-text h1 {
    font-size: 1.2rem;
  }

  .header-text .lead {
    font-size: 0.85rem;
    line-height: 1.6;
  }

  .container {
    padding: 0 10px 24px;
  }

  .card {
    padding: 14px;
    border-radius: 14px;
  }

  .action-grid {
    grid-template-columns: 1fr;
  }

  .action-btn {
    padding: 13px 12px;
  }

  .action-result {
    min-height: 140px;
    font-size: 13px;
  }

  .nav-text {
    font-size: 11px;
  }
}