/* ============================================
   総額ナビ デザインシステム v2
   フラット・エディトリアル（グラデーション不使用）
   ============================================ */
:root {
  --ink: #1b2430;
  --ink-2: #2c3a4e;
  --primary: #1e4e8c;
  --primary-dark: #163b6b;
  --primary-pale: #eef3f9;
  --danger: #b3261e;
  --bg: #ffffff;
  --bg-alt: #f4f6f8;
  --card: #ffffff;
  --border: #d8dde3;
  --border-strong: #b9c2cc;
  --text: #1b2430;
  --muted: #5c6b7a;
  --radius: 4px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* ===== Header ===== */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
}
.brand { display: flex; align-items: baseline; gap: 10px; white-space: nowrap; }
.brand .logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: .02em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand .logo::before {
  content: "";
  width: 12px;
  height: 12px;
  background: var(--primary);
  flex-shrink: 0;
}
.brand .logo span { color: var(--primary); }
.brand .tagline { font-size: 11px; color: var(--muted); }
.global-nav { display: flex; gap: 2px; overflow-x: auto; }
.global-nav a {
  padding: 8px 12px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-2);
  border-radius: var(--radius);
  white-space: nowrap;
}
.global-nav a:hover { color: var(--primary); background: var(--primary-pale); text-decoration: none; }
.global-nav a.cta {
  background: var(--primary);
  color: #fff;
  margin-left: 6px;
}
.global-nav a.cta:hover { background: var(--primary-dark); }

/* ===== Hero ===== */
.hero {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 64px 0 56px;
}
.hero .container { max-width: 880px; }
.hero h1 {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: .01em;
  line-height: 1.4;
  color: var(--ink);
  padding-left: 18px;
  border-left: 5px solid var(--primary);
  margin-bottom: 20px;
}
.hero .lead {
  font-size: 16px;
  color: var(--ink-2);
  max-width: 640px;
  margin-bottom: 28px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-actions a {
  display: inline-block;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}
.hero-actions a:hover { text-decoration: none; }
.hero-actions .primary { background: var(--primary); color: #fff; }
.hero-actions .primary:hover { background: var(--primary-dark); }
.hero-actions .secondary { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }
.hero-actions .secondary:hover { background: var(--primary-pale); }
.hero-stats {
  display: flex;
  gap: 0;
  margin-top: 40px;
  border: 1px solid var(--border);
  max-width: 560px;
}
.hero-stats .stat {
  flex: 1;
  text-align: center;
  padding: 14px 8px;
  border-right: 1px solid var(--border);
}
.hero-stats .stat:last-child { border-right: none; }
.hero-stats .stat .num { font-size: 22px; font-weight: 800; color: var(--primary); }
.hero-stats .stat .label { font-size: 11.5px; color: var(--muted); }

/* ===== Sections ===== */
.section { padding: 56px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--ink);
  padding-left: 14px;
  border-left: 5px solid var(--primary);
}
.section-sub { color: var(--muted); font-size: 14px; margin: 12px 0 32px; max-width: 640px; }

/* ===== Tool cards grid ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--text);
}
a.tool-card:hover { border-color: var(--primary); text-decoration: none; }
.tool-card .tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--primary);
  border: 1px solid var(--primary);
  padding: 2px 10px;
}
.tool-card h3 { font-size: 17px; font-weight: 800; }
.tool-card p { font-size: 13.5px; color: var(--muted); flex: 1; }
.tool-card .link { font-size: 13.5px; font-weight: 700; color: var(--primary); }

/* ===== Feature row ===== */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.feature {
  background: #fff;
  border: 1px solid var(--border);
  padding: 24px 22px;
}
.feature .num {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
  display: inline-block;
  padding-bottom: 4px;
  margin-bottom: 14px;
}
.feature h3 { font-size: 15.5px; font-weight: 800; margin-bottom: 6px; }
.feature p { font-size: 13px; color: var(--muted); }

/* ===== Car promo ===== */
.car-promo {
  background: var(--ink);
  border-radius: var(--radius);
  color: #fff;
  padding: 40px 36px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: center;
}
.car-promo h2 { font-size: 24px; font-weight: 800; letter-spacing: .01em; margin-bottom: 12px; line-height: 1.5; }
.car-promo p { font-size: 14px; color: #c4ccd6; margin-bottom: 20px; }
.car-promo .btn-white {
  display: inline-block;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  padding: 12px 26px;
  border-radius: var(--radius);
  font-size: 14px;
}
.car-promo .btn-white:hover { text-decoration: none; background: #e6eaef; }
.car-promo ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.car-promo ul a {
  display: block;
  border: 1px solid #46546a;
  color: #fff;
  border-radius: var(--radius);
  padding: 11px 16px;
  font-size: 13.5px;
  font-weight: 600;
}
.car-promo ul a:hover { border-color: #fff; text-decoration: none; }

/* ===== FAQ ===== */
.faq-list { max-width: 760px; display: flex; flex-direction: column; gap: 10px; }
.faq-list details {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 14.5px;
  padding: 15px 44px 15px 18px;
  list-style: none;
  position: relative;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before { content: "Q."; color: var(--primary); font-weight: 800; margin-right: 8px; }
.faq-list summary::after { content: "＋"; position: absolute; right: 18px; color: var(--muted); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list .answer { padding: 0 18px 15px; font-size: 13.5px; color: var(--ink-2); border-top: 1px dashed var(--border); padding-top: 12px; margin: 0 18px 15px; padding-left: 0; padding-right: 0; }
.faq-list .answer::before { content: "A."; color: var(--danger); font-weight: 800; margin-right: 8px; }

/* ===== Calculator components ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
}
.card-title {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

label { display: block; font-size: 13px; font-weight: 700; color: var(--ink-2); margin-bottom: 6px; margin-top: 16px; }
label:first-of-type { margin-top: 0; }

input[type="number"], input[type="text"], select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: 16px;
  color: var(--text);
  background: #fff;
}
input:focus, select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-pale); }

.input-group { position: relative; }
.input-group .unit {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  color: var(--muted); font-size: 14px; pointer-events: none;
}
.input-group input { padding-right: 44px; }

.radio-group { display: flex; gap: 8px; flex-wrap: wrap; }
.radio-group label {
  margin: 0; display: flex; align-items: center; gap: 6px;
  font-size: 13.5px; color: var(--text); cursor: pointer;
  padding: 8px 14px; border: 1px solid var(--border-strong); border-radius: var(--radius); font-weight: 600;
  background: #fff;
}
.radio-group input[type="radio"] { display: none; }
.radio-group label.selected { border-color: var(--primary); background: var(--primary); color: #fff; }

.btn {
  display: inline-block; padding: 13px 28px; border-radius: var(--radius); border: none;
  font-size: 15px; font-weight: 700; cursor: pointer; margin-top: 20px; width: 100%;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger {
  background: none; color: var(--danger); border: 1px solid var(--danger);
  padding: 5px 12px; font-size: 12.5px; width: auto; margin-top: 0; border-radius: var(--radius);
  cursor: pointer;
}

.result-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px;
  margin-top: 20px;
  display: none;
}
.result-box.show { display: block; }
.result-box .breakdown-row { display: flex; justify-content: space-between; font-size: 14px; padding: 3px 0; }
.result-box .breakdown-row.total {
  font-weight: 800; font-size: 16px; border-top: 1px solid var(--border-strong);
  padding-top: 8px; margin-top: 4px; color: var(--primary);
}

.cart-item { display: flex; gap: 10px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--border); }
.cart-item:last-child { border-bottom: none; }
.cart-item-name { flex: 1; font-weight: 600; }
.cart-item-price { color: var(--muted); font-size: 14px; min-width: 80px; text-align: right; }
.cart-empty { text-align: center; color: var(--muted); padding: 24px 0; font-size: 14px; }
.add-item-row { display: grid; grid-template-columns: 1fr auto auto; gap: 8px; margin-top: 16px; align-items: end; }
.btn-add {
  background: var(--primary); color: #fff; border: none; border-radius: var(--radius);
  padding: 12px 18px; font-size: 20px; cursor: pointer; font-weight: 700; height: 46px;
}
.btn-add:hover { background: var(--primary-dark); }
.tax-badge {
  display: inline-block; padding: 1px 7px; border: 1px solid var(--border-strong); color: var(--muted);
  border-radius: var(--radius); font-size: 11px; font-weight: 700; margin-left: 4px;
}
.qty-btn { border: 1px solid var(--border-strong); background: #fff; border-radius: var(--radius); padding: 2px 8px; cursor: pointer; font-size: 16px; }

input[type="range"] {
  -webkit-appearance: none; width: 100%; height: 4px; border-radius: 0;
  background: var(--border-strong); outline: none; border: none; padding: 0; box-shadow: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--primary); cursor: pointer; border: 2px solid #fff; box-shadow: 0 0 0 1px var(--border-strong);
}

.tip { font-size: 12px; color: var(--muted); margin-top: 6px; line-height: 1.6; }

/* ===== Tool page layout ===== */
.page-header { padding: 36px 0 8px; }
.breadcrumb { font-size: 12.5px; color: var(--muted); margin-bottom: 14px; }
.breadcrumb a { color: var(--muted); }
.page-header h1 {
  font-size: 26px;
  font-weight: 800;
  line-height: 1.45;
  padding-left: 14px;
  border-left: 5px solid var(--primary);
}
.page-header .lead { color: var(--muted); font-size: 14px; margin-top: 12px; }

.prose { font-size: 15px; }
.prose h2 {
  font-size: 20px; font-weight: 800; margin: 44px 0 16px;
  padding-bottom: 8px; border-bottom: 2px solid var(--ink); line-height: 1.4;
}
.prose h3 { font-size: 16.5px; font-weight: 800; margin: 28px 0 10px; }
.prose p { margin-bottom: 14px; }
.prose ul, .prose ol { margin: 0 0 14px 24px; }
.prose li { margin-bottom: 6px; }
.prose table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; background: #fff; }
.prose th, .prose td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.prose th { background: var(--bg-alt); font-weight: 700; }

/* ===== Related links ===== */
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 20px; }
.related-grid a {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 15px 17px; font-size: 14px; font-weight: 700; color: var(--text);
}
.related-grid a:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.related-grid a .desc { display: block; font-size: 12px; color: var(--muted); font-weight: 500; margin-top: 4px; }

/* ===== CTA banner ===== */
.cta-banner {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px;
  margin: 32px 0;
}
.cta-banner .title { font-weight: 800; font-size: 15px; margin-bottom: 6px; }
.cta-banner p { font-size: 13.5px; color: var(--muted); margin-bottom: 12px; }
.cta-banner a.btn-cta {
  display: inline-block; background: var(--primary); color: #fff;
  font-weight: 700; font-size: 13.5px; padding: 10px 22px; border-radius: var(--radius);
}
.cta-banner a.btn-cta:hover { background: var(--primary-dark); text-decoration: none; }

/* ===== Footer ===== */
.site-footer {
  background: var(--ink);
  color: #c4ccd6;
  padding: 44px 0 28px;
  margin-top: 72px;
  font-size: 13.5px;
}
.site-footer .cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px;
  margin-bottom: 28px;
}
.site-footer h4 {
  color: #fff; font-size: 13px; margin-bottom: 12px; letter-spacing: .05em;
  padding-bottom: 8px; border-bottom: 1px solid #46546a;
}
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #c4ccd6; }
.site-footer a:hover { color: #fff; }
.site-footer .copyright {
  border-top: 1px solid #46546a;
  padding-top: 18px; text-align: center; font-size: 12px; color: #8a96a5;
}

@media (max-width: 720px) {
  .hero h1 { font-size: 26px; }
  .hero { padding: 40px 0 36px; }
  .car-promo { grid-template-columns: 1fr; padding: 28px 22px; }
  .section { padding: 40px 0; }
  .page-header h1 { font-size: 21px; }
  .card { padding: 20px; }
  .brand .tagline { display: none; }
}