:root {
  font-size: 112.5%; /* 基準18px。スマホでの可読性優先のため、rem指定の全文字サイズを底上げ */
  --color-bg: #f7f7f5;
  --color-surface: #ffffff;
  --color-border: #e2e0da;
  --color-text: #2b2a27;
  --color-text-muted: #6b6a65;
  --color-primary: #e0722f;
  --color-primary-dark: #c25e21;
  --color-best: #2f8f5b;
  --color-best-bg: #eaf7ef;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* ヘッダー・ハンバーガーナビ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  padding: 12px 16px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-bar {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-toggle {
  position: relative;
  z-index: 210;
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 0.8rem;
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle-bars {
  position: relative;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: background 0.2s ease 0.1s;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s ease, top 0.15s ease;
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars {
  background: transparent;
  transition: background 0.1s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  top: 0;
  transform: rotate(45deg);
  transition: top 0.15s ease, transform 0.25s ease 0.1s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  top: 0;
  transform: rotate(-45deg);
  transition: top 0.15s ease, transform 0.25s ease 0.1s;
}

/* 全画面オーバーレイメニュー */

.site-nav {
  position: fixed;
  inset: 0;
  z-index: 190;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 80px 24px 40px;
  background: #eee;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0.25s;
}

.site-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0s;
}

body.nav-open {
  overflow: hidden;
}

.site-nav a {
  padding: 12px 20px;
  color: var(--color-text);
  text-decoration: none;
  border-radius: 8px;
  font-size: 1.1rem;
}

.site-nav a:hover {
  background: var(--color-border);
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary-dark);
  font-weight: 700;
}

.nav-section-label {
  margin: 8px 0 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.nav-category-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  width: 100%;
  max-width: 400px;
  margin: 4px 0;
}

.site-nav .nav-category-grid a {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 10px;
  text-align: center;
  font-size: 0.95rem;
  font-weight: 700;
}

.site-nav .nav-category-grid a:hover {
  background: var(--color-surface);
  border-color: var(--color-primary);
}

/* ページ見出し */

.page-hero {
  padding: 24px 0 16px;
  text-align: center;
}

.page-hero h1 {
  margin: 0 0 6px;
  font-size: 1.6rem;
  color: var(--color-primary-dark);
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

/* トップページ：カテゴリカード */

.category-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 20px 0 28px;
}

.category-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 12px;
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
}

.category-card:hover {
  border-color: var(--color-primary);
}

.category-card .icon {
  display: block;
  font-size: 1.7rem;
  margin-bottom: 8px;
}

.category-card .name {
  font-weight: 700;
}

/* 商品比較フォーム */

.product-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 14px;
}

.product-row {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px;
  position: relative;
}

.product-row.is-best {
  border-color: var(--color-best);
  background: var(--color-best-bg);
}

.product-row .row-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.product-row .field-name,
.product-row .field-extra {
  grid-column: 1 / -1;
}

.product-row label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 3px;
}

.product-row input,
.product-row select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--color-text);
}

.product-row input:focus,
.product-row select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.row-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  line-height: 1;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 6px;
}

.row-remove:hover {
  background: var(--color-border);
}

.row-price {
  margin-top: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.product-row.is-best .row-price {
  color: var(--color-best);
}

.best-badge {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--color-best);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  vertical-align: middle;
}

.btn {
  display: block;
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.row-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.row-actions .btn-add {
  flex: 1;
  margin-bottom: 0;
}

.btn-add {
  background: var(--color-surface);
  border: 1.5px dashed var(--color-primary);
  color: var(--color-primary-dark);
}

.btn-add:hover {
  background: #fff3ea;
}

.btn-reset {
  flex: 0 0 auto;
  width: auto;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 12px 14px;
}

.btn-primary {
  display: block;
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-reset:hover {
  background: var(--color-border);
}

.result {
  min-height: 1px;
}

.result-summary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.result-summary p {
  margin: 4px 0;
}

.how-to {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.how-to h2 {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.how-to .note {
  margin-top: 10px;
  font-size: 0.85rem;
}

.form-embed {
  margin: 16px 0 24px;
}

.form-embed iframe {
  display: block;
  width: 100%;
  /* 質問4項目・送信ボタンまでを表示するための固定値（375px幅で実測）。
     scrolling="no"のためこれより下（Googleの定型注記の一部）は表示されないが、機能上は問題ない。
     質問を追加編集した場合はここも要調整 */
  height: 1230px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

/* 読みもの系ページ（このサービスについて・使い方・プライバシーポリシー） */

.article {
  color: var(--color-text);
  font-size: 0.95rem;
}

.article h2 {
  font-size: 1.05rem;
  margin: 24px 0 8px;
  color: var(--color-text);
}

.article h2:first-child {
  margin-top: 0;
}

.article p,
.article li {
  color: var(--color-text-muted);
}

.article ul,
.article ol {
  padding-left: 1.2em;
}

.site-footer {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  padding: 20px 16px 40px;
  font-size: 0.8rem;
}

.footer-brand {
  margin: 0 0 8px;
  font-size: 1rem;
  text-align: left;
}

.footer-links {
  margin: 0;
}

.site-footer a {
  color: var(--color-text-muted);
}

.footer-brand a {
  color: var(--color-primary-dark);
  font-weight: 700;
  text-decoration: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1c1b19;
    --color-surface: #26241f;
    --color-border: #3a3833;
    --color-text: #ece9e2;
    --color-text-muted: #a7a49b;
    --color-best-bg: #16281f;
  }
}