:root {
  --navy: #1a3a5c;
  --navy-dark: #122a44;
  --green: #28a745;
  --green-dark: #1f8a38;
  --bg: #f4f6f9;
  --text: #2b3440;
  --muted: #6b7686;
  --border: #dde3ea;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
}

/* ===== グローバルナビ ===== */
.topbar {
  background: var(--navy-dark);
  color: #fff;
}

.topbar-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.site-title {
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}

.site-nav a {
  color: #c8d6e5;
  text-decoration: none;
  font-size: 0.88rem;
}

.site-nav a:hover {
  color: #fff;
}

/* ===== ヒーロー ===== */
.site-header {
  background: linear-gradient(135deg, var(--navy), var(--navy-dark));
  color: #fff;
  padding: 32px 16px 28px;
  text-align: center;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  font-size: 0.9rem;
  opacity: 0.9;
}

/* ===== レイアウト・カード ===== */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
  color: var(--navy);
  border-left: 4px solid var(--green);
  padding-left: 10px;
}

.form-intro {
  margin: 0 0 16px;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ===== フォーム ===== */
.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.field-hint {
  margin: 6px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-wrap input {
  flex: 1;
  min-width: 0;
  font-size: 1.1rem;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fafbfc;
}

.input-wrap input:focus {
  outline: none;
  border-color: var(--green);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.15);
}

.unit {
  color: var(--muted);
  font-size: 0.95rem;
  white-space: nowrap;
}

.form-error {
  color: #c0392b;
  font-size: 0.9rem;
  min-height: 1.2em;
  margin: 0 0 8px;
}

#calc-btn {
  display: block;
  width: 100%;
  padding: 14px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  background: var(--green);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

#calc-btn:hover {
  background: var(--green-dark);
}

#calc-btn:active {
  transform: scale(0.98);
}

/* ===== 結果 ===== */
.result-area {
  margin: 16px 0;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.result-area.visible {
  opacity: 1;
  transform: translateY(0);
}

.result-area h2 {
  font-size: 1.15rem;
  color: var(--navy);
  border-left: 4px solid var(--green);
  padding-left: 10px;
  margin: 0 0 12px;
}

/* 手取り年額（大きく） */
.result-tedori {
  background: #fff;
  border: 2px solid var(--green);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(40, 167, 69, 0.12);
  margin-bottom: 14px;
}

.tedori-label {
  margin: 0 0 4px;
  font-size: 0.85rem;
  color: var(--muted);
}

.tedori-value {
  margin: 0 0 4px;
  font-size: 2rem;
  font-weight: 700;
  color: var(--green-dark);
  line-height: 1.3;
}

.tedori-monthly {
  margin: 0;
  font-size: 0.95rem;
  color: var(--navy);
  font-weight: 600;
}

/* 内訳カード */
.result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.result-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.rc-label {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.rc-value {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
}

.result-rate {
  margin: 14px 0 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  text-align: center;
}

.result-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 10px 0 0;
}

/* ===== 注意書き ===== */
.disclaimer {
  background: #fbfcf7;
  border: 1px solid #e3e8d8;
}

.disclaimer p {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
}

/* ===== 広告枠（記事ページ用） ===== */
.ad-area {
  margin: 20px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 250px;
}

.ad-label {
  color: #aab3bf;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
}

/* ===== 記事ページ ===== */
.article h1 {
  font-size: 1.4rem;
  color: var(--navy);
  line-height: 1.5;
  margin: 0 0 16px;
  border-bottom: 2px solid var(--green);
  padding-bottom: 12px;
}

.article .lead {
  font-size: 1rem;
  color: var(--text);
}

.article blockquote {
  margin: 14px 0;
  padding: 10px 16px;
  background: #f4f6f9;
  border-left: 4px solid var(--green);
  border-radius: 0 8px 8px 0;
  font-weight: 600;
  color: var(--navy);
}

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

.article li {
  margin: 4px 0;
}

/* ===== 記事一覧（トップ） ===== */
.article-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.article-card {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, transform 0.1s;
}

.article-card:hover {
  border-color: var(--green);
  transform: translateY(-2px);
}

.article-card .card-cat {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--green-dark);
  letter-spacing: 0.05em;
}

.article-card .card-title {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-top: 2px;
}

/* ===== フッター ===== */
.site-footer {
  text-align: center;
  padding: 24px 16px 32px;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer nav {
  margin-bottom: 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 14px;
}

.site-footer nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer nav a:hover {
  color: var(--navy);
  text-decoration: underline;
}

/* ===== レスポンシブ ===== */
@media (min-width: 600px) {
  .site-header h1 {
    font-size: 1.9rem;
  }

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

  .article-list {
    grid-template-columns: 1fr 1fr;
  }
}