/* ==========================================================================
   有限会社ニシツジ — 冊子・製本オーダーサイト
   Design: 装丁本の品格を宿すクラシック × 現代のUX
   ========================================================================== */

/* --- Design Tokens ----------------------------------------------------- */
:root {
  /* Palette — 装丁本のアーカイブ的な色調 */
  --paper: #f4ecd8;         /* 生成紙 */
  --paper-alt: #ede4cb;     /* 生成紙の陰影 */
  --paper-shadow: #ddd3b3;
  --ink: #2a2620;           /* 墨色 */
  --ink-soft: #4a4238;
  --ink-mute: #7a7266;
  --crimson: #8b2e2e;       /* 深緋（革装丁の赤） */
  --crimson-deep: #6a2020;
  --gold: #b89358;          /* 金（箔押し） */
  --gold-deep: #977236;
  --navy: #2c3e50;          /* 藍鉄（クラシック紺） */
  --rule: #cabf9a;          /* 罫線 */
  --paper-white: #fbf7ea;   /* 生成紙の白側 */
  --shadow: rgba(60, 45, 20, 0.12);

  /* Typography */
  --serif: 'Shippori Mincho', 'Hiragino Mincho ProN', 'Yu Mincho', 'MS Mincho', serif;
  --sans: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Meiryo', sans-serif;
  --display: 'Cormorant Garamond', 'Shippori Mincho', serif;

  /* Layout */
  --max-w: 1180px;
  --max-narrow: 860px;
  --radius: 3px;
  --radius-lg: 6px;
  --gap: 24px;
}

/* --- Reset ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  /* うっすら紙のテクスチャ */
  background-image:
    radial-gradient(rgba(90, 70, 30, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-alt) 100%);
  background-size: 3px 3px, 100% 100%;
  background-attachment: fixed;
}
img { max-width: 100%; display: block; }
a { color: var(--crimson); text-decoration: none; transition: color .2s; }
a:hover { color: var(--gold-deep); }
button { font-family: inherit; cursor: pointer; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

/* --- Utilities --------------------------------------------------------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: var(--max-narrow); margin: 0 auto; padding: 0 24px; }
.text-center { text-align: center; }
.mono { font-variant-numeric: tabular-nums; }
.gold { color: var(--gold-deep); }
.crimson { color: var(--crimson); }

/* --- Header ------------------------------------------------------------ */
.site-header {
  background: var(--paper-white);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(120, 90, 40, 0.06);
}
.site-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.brand-mark {
  width: 40px;
  height: 40px;
  background: var(--crimson);
  color: var(--paper-white);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  box-shadow: inset 0 0 0 1px var(--gold), 0 2px 4px var(--shadow);
}
.brand-logo-img {
  height: 44px;
  width: auto;
  display: block;
  transition: opacity .15s;
}
.brand-logo-img:hover { opacity: 0.8; }
@media (max-width: 720px) {
  .brand-logo-img { height: 36px; }
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.06em;
}
.brand-en {
  font-family: var(--display);
  font-size: 11px;
  font-style: italic;
  color: var(--ink-mute);
  letter-spacing: 0.15em;
}
.nav {
  display: flex;
  gap: 22px;
  align-items: center;
}
.nav a {
  color: var(--ink-soft);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 6px 0;
  position: relative;
  white-space: nowrap;
}
.nav a:hover { color: var(--crimson); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--gold);
}
.nav-cta {
  background: var(--crimson);
  color: var(--paper-white) !important;
  padding: 9px 18px !important;
  border-radius: var(--radius);
  font-size: 13px !important;
  letter-spacing: 0.1em;
  transition: background .2s;
}
.nav-cta:hover { background: var(--crimson-deep); color: var(--paper-white) !important; }
.cart-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-soft) !important;
  padding: 6px 10px !important;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  font-size: 13px !important;
}
.cart-badge:hover { border-color: var(--crimson); color: var(--crimson) !important; }
.cart-count {
  background: var(--crimson);
  color: var(--paper-white);
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  padding: 6px 10px;
  border-radius: var(--radius);
  color: var(--ink);
}

/* --- Hero -------------------------------------------------------------- */
.hero {
  padding: 90px 24px 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: 40px; left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 1px;
  background: var(--gold);
}
.hero::after {
  content: "";
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 1px;
  background: var(--gold);
}
.hero-kicker {
  font-family: var(--display);
  color: var(--gold-deep);
  font-style: italic;
  letter-spacing: 0.3em;
  font-size: 14px;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(28px, 5vw, 46px);
  margin: 0 0 24px;
  line-height: 1.5;
  font-weight: 500;
}
.hero-sub {
  font-family: var(--serif);
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 2;
}
.hero-cta {
  display: inline-flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* --- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 14px 30px;
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: 0.12em;
  border: none;
  transition: all .2s;
  text-align: center;
}
.btn-primary {
  background: var(--crimson);
  color: var(--paper-white);
  box-shadow: 0 3px 0 var(--crimson-deep);
}
.btn-primary:hover {
  color: var(--paper-white);
  transform: translateY(-1px);
  box-shadow: 0 4px 0 var(--crimson-deep);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--paper-white);
}
.btn-gold {
  background: var(--gold);
  color: var(--paper-white);
  box-shadow: 0 3px 0 var(--gold-deep);
}
.btn-gold:hover { color: var(--paper-white); background: var(--gold-deep); }

.btn-lg { padding: 16px 40px; font-size: 15px; }
.btn-full { display: block; width: 100%; }

/* --- Sections ---------------------------------------------------------- */
.section {
  padding: 80px 0;
}
.section-alt {
  background: var(--paper-white);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.section-title {
  text-align: center;
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 34px);
}
.section-title-en {
  text-align: center;
  font-family: var(--display);
  font-style: italic;
  color: var(--gold-deep);
  letter-spacing: 0.3em;
  font-size: 13px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-lead {
  text-align: center;
  font-family: var(--serif);
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto 56px;
  line-height: 2;
}

/* --- Product Grid ------------------------------------------------------ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  margin-top: 40px;
}
.product-card {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow);
}
.product-cover {
  height: 260px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--rule);
}
.product-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-title {
  font-family: var(--serif);
  font-size: 20px;
  margin: 0 0 8px;
  font-weight: 500;
}
.product-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0 0 16px;
  flex: 1;
}
.product-price {
  font-family: var(--display);
  color: var(--crimson);
  font-size: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.product-price small {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  margin-left: 6px;
}
.product-cta {
  display: block;
  text-align: center;
  padding: 12px;
  border: 1px solid var(--ink);
  color: var(--ink);
  border-radius: var(--radius);
  font-size: 13px;
  letter-spacing: 0.1em;
  transition: all .2s;
}
.product-cta:hover {
  background: var(--ink);
  color: var(--paper-white);
}

/* --- Book Cover Visual (CSS本表現) ------------------------------------ */
/* 装丁本を CSSだけで表現するミニビジュアル */
.book {
  width: 160px;
  height: 220px;
  position: relative;
  transform: rotate(-3deg);
  transition: transform .4s;
  box-shadow:
    2px 2px 5px rgba(0,0,0,0.15),
    -6px 6px 15px rgba(0,0,0,0.1);
}
.product-card:hover .book { transform: rotate(0deg); }
.book::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 8px;
  background: linear-gradient(90deg, rgba(0,0,0,0.35), rgba(0,0,0,0.05));
}
.book-title {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--gold);
  font-family: var(--serif);
  font-size: 14px;
  text-align: center;
  letter-spacing: 0.15em;
  writing-mode: vertical-rl;
  height: 60%;
  text-shadow: 0 0 2px rgba(255,215,120,.35);
}
.book-frame {
  position: absolute;
  inset: 12px;
  border: 1px solid var(--gold);
  border-radius: 1px;
  opacity: 0.6;
}

/* 5種類のバリエーション */
.book.encyclopedia {
  background: linear-gradient(135deg, #4a1a1a, #7a2a2a 60%, #4a1a1a);
  background-image:
    linear-gradient(135deg, #4a1a1a, #7a2a2a 60%, #4a1a1a),
    repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(0,0,0,0.05) 2px, rgba(0,0,0,0.05) 4px);
}
.book.novel {
  background: linear-gradient(135deg, #d4c4a0, #e8dcb8 60%, #d4c4a0);
  border: 1px solid #a89570;
}
.book.novel .book-title { color: var(--ink); text-shadow: none; }
.book.novel .book-frame { border-color: var(--ink); opacity: 0.4; }
.book.leather {
  background:
    linear-gradient(135deg, #3a2412, #5a3418 60%, #2a1808);
  background-image:
    radial-gradient(circle at 30% 30%, rgba(255,220,150,0.06), transparent 40%),
    linear-gradient(135deg, #3a2412, #5a3418 60%, #2a1808);
}
.book.fauxleather {
  background: linear-gradient(135deg, #1e3a52, #2c4c68 60%, #14253a);
}
.book.wasoubound {
  background: linear-gradient(135deg, #3a2438, #5a3858 60%, #2a1828);
  background-image:
    repeating-linear-gradient(45deg, transparent, transparent 6px, rgba(255,255,255,0.03) 6px, rgba(255,255,255,0.03) 8px),
    linear-gradient(135deg, #3a2438, #5a3858 60%, #2a1828);
}

/* --- Features (信頼要素) ---------------------------------------------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  margin-top: 40px;
}
.feature {
  text-align: center;
  padding: 0 12px;
}
.feature-num {
  font-family: var(--display);
  font-style: italic;
  font-size: 40px;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 12px;
}
.feature h3 {
  font-size: 18px;
  margin: 0 0 12px;
}
.feature p {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.9;
  margin: 0;
}

/* --- Steps (流れ) ----------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 28px;
  margin-top: 40px;
}
.step {
  text-align: center;
  padding: 24px 16px;
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  position: relative;
}
.step-num {
  font-family: var(--display);
  color: var(--crimson);
  font-size: 14px;
  letter-spacing: 0.3em;
  margin-bottom: 8px;
}
.step-num::before { content: "— "; }
.step-num::after { content: " —"; }
.step h3 { font-size: 17px; margin: 8px 0; }
.step p { font-size: 13px; color: var(--ink-soft); margin: 0; line-height: 1.8; }

/* --- CTA Band --------------------------------------------------------- */
.cta-band {
  background: var(--ink);
  color: var(--paper-white);
  padding: 70px 24px;
  text-align: center;
  position: relative;
}
.cta-band::before, .cta-band::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 1px;
  background: var(--gold);
}
.cta-band::before { top: 30px; }
.cta-band::after { bottom: 30px; }
.cta-band h2 {
  color: var(--paper-white);
  font-size: clamp(22px, 3vw, 28px);
  margin: 0 0 16px;
}
.cta-band p {
  color: rgba(255, 240, 210, 0.8);
  max-width: 520px;
  margin: 0 auto 32px;
}

/* --- Customize Page --------------------------------------------------- */
.customize-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  margin-top: 40px;
}
.customize-form {
  background: var(--paper-white);
  padding: 32px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
}
.customize-summary {
  background: var(--ink);
  color: var(--paper-white);
  padding: 32px;
  border-radius: var(--radius-lg);
  position: sticky;
  top: 90px;
  align-self: start;
}
.customize-summary h3 { color: var(--paper-white); font-size: 18px; margin: 0 0 20px; }
.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(200, 180, 140, 0.25);
  font-size: 13.5px;
}
.summary-row:last-of-type { border-bottom: none; }
.summary-label { color: rgba(255,240,210,0.7); }
.summary-value { text-align: right; color: var(--paper-white); }
.summary-total {
  border-top: 2px solid var(--gold) !important;
  padding-top: 16px !important;
  margin-top: 12px;
  font-family: var(--display);
  font-size: 22px;
  color: var(--gold) !important;
  font-weight: 600;
}

.field {
  margin-bottom: 28px;
}
.field-label {
  display: block;
  font-family: var(--serif);
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--ink);
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 8px;
}
.field-label small {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  margin-left: 8px;
  font-weight: normal;
}
.option-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}
.option {
  position: relative;
  display: block;
  cursor: pointer;
}
.option input { position: absolute; opacity: 0; }
.option-body {
  padding: 14px 12px;
  border: 1.5px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper-white);
  text-align: center;
  font-size: 13.5px;
  transition: all .2s;
  line-height: 1.5;
}
.option-body small {
  display: block;
  color: var(--ink-mute);
  font-size: 11.5px;
  margin-top: 4px;
}
.option input:checked + .option-body {
  border-color: var(--crimson);
  background: linear-gradient(180deg, var(--paper-white), #fef7e0);
  box-shadow: 0 0 0 2px rgba(139, 46, 46, 0.15), inset 0 0 0 1px var(--crimson);
  color: var(--crimson);
}
.option input:checked + .option-body small { color: var(--crimson); opacity: 0.85; }

.range-field {
  display: flex;
  align-items: center;
  gap: 20px;
}
.range-field input[type="range"] {
  flex: 1;
  accent-color: var(--crimson);
}
.range-value {
  font-family: var(--display);
  font-size: 22px;
  color: var(--crimson);
  min-width: 80px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.range-value small {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  margin-left: 3px;
}

.checkbox-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}
.check-option {
  display: flex;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  cursor: pointer;
  background: var(--paper-white);
  font-size: 13.5px;
  transition: all .2s;
  gap: 10px;
}
.check-option input { accent-color: var(--crimson); }
.check-option:has(input:checked) {
  border-color: var(--crimson);
  background: linear-gradient(180deg, var(--paper-white), #fef7e0);
}
.check-price {
  margin-left: auto;
  color: var(--crimson);
  font-family: var(--display);
  font-size: 15px;
}

/* --- Table ------------------------------------------------------------ */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}
.table th, .table td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  font-size: 14px;
}
.table th {
  font-family: var(--serif);
  background: var(--paper-alt);
  font-weight: 500;
  border-bottom: 2px solid var(--gold);
}
.table td.mono { text-align: right; font-variant-numeric: tabular-nums; }

/* --- Cart ------------------------------------------------------------- */
.cart-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  margin-top: 40px;
}
.cart-items {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
}
.cart-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
  align-items: center;
}
.cart-item:last-child { border-bottom: none; }
.cart-item-cover {
  width: 100px; height: 130px;
  display: flex; align-items: center; justify-content: center;
  background: var(--paper-alt);
  border-radius: var(--radius);
}
.cart-item-title {
  font-family: var(--serif);
  font-size: 17px;
  margin: 0 0 8px;
}
.cart-item-spec {
  font-size: 12.5px;
  color: var(--ink-mute);
  line-height: 1.8;
}
.cart-item-price {
  font-family: var(--display);
  color: var(--crimson);
  font-size: 20px;
  white-space: nowrap;
}
.qty-ctrl {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 8px;
}
.qty-ctrl button {
  border: none;
  background: transparent;
  width: 30px;
  height: 30px;
  font-size: 16px;
  color: var(--ink);
}
.qty-ctrl input {
  width: 40px;
  border: none;
  text-align: center;
  background: transparent;
  font-family: var(--sans);
  font-size: 14px;
}

/* --- Forms ------------------------------------------------------------ */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-grid .full { grid-column: 1 / -1; }
.form-group { display: flex; flex-direction: column; }
.form-group label {
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--ink-soft);
  font-weight: 500;
}
.form-group label .required { color: var(--crimson); margin-left: 4px; }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper-white);
  font-family: inherit;
  font-size: 14px;
  color: var(--ink);
  transition: border-color .2s, box-shadow .2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--crimson);
  box-shadow: 0 0 0 3px rgba(139, 46, 46, 0.1);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* --- Checkout / Stripe mock ------------------------------------------- */
.checkout-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  margin-top: 40px;
}
.checkout-section {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
}
.checkout-section h2 {
  margin: 0 0 20px;
  font-size: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--gold);
}
.card-input {
  background: linear-gradient(135deg, #f8f2df 0%, #ede4c8 100%);
  border: 1px solid var(--rule);
  padding: 22px;
  border-radius: var(--radius-lg);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.2em;
  position: relative;
}
.card-input::before {
  content: "";
  position: absolute;
  top: 22px;
  right: 22px;
  width: 40px;
  height: 26px;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  border-radius: 3px;
}
.stripe-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink-mute);
  margin-top: 12px;
}
.stripe-badge::before {
  content: "🔒";
  font-size: 14px;
}
.payment-method {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 24px;
}
.payment-method label {
  padding: 14px;
  border: 1.5px solid var(--rule);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  background: var(--paper-white);
  font-size: 14px;
  transition: all .2s;
}
.payment-method input { display: none; }
.payment-method input:checked + span {
  color: var(--crimson);
}
.payment-method label:has(input:checked) {
  border-color: var(--crimson);
  background: linear-gradient(180deg, var(--paper-white), #fef7e0);
  box-shadow: inset 0 0 0 1px var(--crimson);
}

.order-summary {
  background: var(--ink);
  color: var(--paper-white);
  padding: 28px;
  border-radius: var(--radius-lg);
  position: sticky;
  top: 90px;
  align-self: start;
}
.order-summary h3 { color: var(--paper-white); margin: 0 0 20px; font-size: 17px; }
.order-line {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(200, 180, 140, 0.2);
  font-size: 13.5px;
}
.order-line:last-of-type { border-bottom: none; }
.order-line span:first-child { color: rgba(255,240,210,0.7); }
.order-total {
  margin-top: 12px;
  padding-top: 16px;
  border-top: 2px solid var(--gold);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--display);
  font-size: 22px;
  color: var(--gold);
}

/* --- Complete Page ---------------------------------------------------- */
.complete-hero {
  text-align: center;
  padding: 100px 24px;
}
.complete-icon {
  width: 80px;
  height: 80px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  margin: 0 auto 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: var(--gold);
}
.order-no {
  font-family: var(--display);
  font-size: 24px;
  color: var(--crimson);
  letter-spacing: 0.1em;
  margin: 12px 0 32px;
}

/* --- Company / About -------------------------------------------------- */
.company-hero {
  padding: 80px 24px 40px;
  text-align: center;
}
.company-block {
  margin: 40px 0;
  padding: 32px 40px;
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--gold);
}
.company-block h2 {
  margin: 0 0 16px;
  font-size: 22px;
}
.company-block p { color: var(--ink-soft); line-height: 2; margin: 0 0 12px; }

/* --- Contact / AI Chat ------------------------------------------------ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  margin-top: 40px;
}
.chat-box {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 560px;
}
.chat-header {
  background: var(--ink);
  color: var(--paper-white);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.chat-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--paper-white);
  font-family: var(--serif);
  font-weight: 500;
}
.chat-header-info { flex: 1; }
.chat-header-info strong { display: block; font-size: 14px; }
.chat-header-info small { color: rgba(255,240,210,0.65); font-size: 11px; }
.chat-online {
  width: 8px; height: 8px; border-radius: 50%;
  background: #7fc27f; box-shadow: 0 0 6px rgba(127, 194, 127, 0.5);
}
.chat-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--paper-alt);
}
.chat-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 13.5px;
  line-height: 1.7;
}
.chat-msg.ai {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  align-self: flex-start;
  border-bottom-left-radius: 2px;
}
.chat-msg.user {
  background: var(--crimson);
  color: var(--paper-white);
  align-self: flex-end;
  border-bottom-right-radius: 2px;
}
.chat-input {
  padding: 14px;
  border-top: 1px solid var(--rule);
  display: flex;
  gap: 8px;
  background: var(--paper-white);
}
.chat-input input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--rule);
  border-radius: 20px;
  font-family: inherit;
  font-size: 14px;
}
.chat-input input:focus { outline: none; border-color: var(--crimson); }
.chat-input button {
  background: var(--crimson);
  color: var(--paper-white);
  border: none;
  padding: 0 20px;
  border-radius: 20px;
  font-size: 13px;
  letter-spacing: 0.1em;
}
.chat-note {
  font-size: 12px;
  color: var(--ink-mute);
  padding: 8px 14px;
  border-top: 1px solid var(--rule);
  background: var(--paper-alt);
  text-align: center;
}

/* --- Footer ----------------------------------------------------------- */
.site-footer {
  background: var(--ink);
  color: rgba(255, 240, 210, 0.75);
  padding: 60px 24px 30px;
  font-size: 13.5px;
}
.footer-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(200, 180, 140, 0.2);
}
.footer-brand-name {
  font-family: var(--serif);
  color: var(--paper-white);
  font-size: 20px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.footer-brand-en {
  font-family: var(--display);
  font-style: italic;
  color: var(--gold);
  letter-spacing: 0.2em;
  font-size: 12px;
  margin-bottom: 20px;
}
.site-footer h4 {
  color: var(--paper-white);
  font-family: var(--serif);
  font-size: 15px;
  margin: 0 0 16px;
  font-weight: 500;
}
.footer-list { list-style: none; padding: 0; margin: 0; }
.footer-list li { padding: 4px 0; }
.footer-list a { color: rgba(255, 240, 210, 0.75); font-size: 13px; }
.footer-list a:hover { color: var(--gold); }
.footer-bottom {
  max-width: var(--max-w);
  margin: 30px auto 0;
  display: flex;
  justify-content: space-between;
  color: rgba(255, 240, 210, 0.4);
  font-size: 12px;
  flex-wrap: wrap;
  gap: 10px;
}

/* --- Alerts / Boxes ---------------------------------------------------- */
.notice {
  padding: 14px 20px;
  border-radius: var(--radius);
  border-left: 3px solid var(--gold);
  background: var(--paper-alt);
  font-size: 13.5px;
  margin: 20px 0;
  color: var(--ink-soft);
  line-height: 1.8;
}

.breadcrumb {
  font-size: 12px;
  color: var(--ink-mute);
  margin: 20px 0;
  letter-spacing: 0.05em;
}
.breadcrumb a { color: var(--ink-mute); }
.breadcrumb a:hover { color: var(--crimson); }

/* --- Responsive ------------------------------------------------------- */
@media (max-width: 900px) {
  .customize-layout,
  .cart-layout,
  .checkout-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }
  .customize-summary,
  .order-summary {
    position: static;
  }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper-white); flex-direction: column;
    padding: 20px; border-bottom: 1px solid var(--rule); gap: 12px; }
  .nav.open { display: flex; }
  .nav a { padding: 10px 0; border-bottom: 1px dashed var(--rule); }
  .nav a:last-child { border-bottom: none; }
  .nav-toggle { display: block; }
  .site-header-inner { position: relative; }
  .hero { padding: 60px 24px 70px; }
  .section { padding: 60px 0; }
  .form-grid { grid-template-columns: 1fr; }
  .cart-item {
    grid-template-columns: 80px 1fr;
  }
  .cart-item-price { grid-column: 2; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ==========================================================================
   BOOKBINDING SERVICES (製本サービス)
   ========================================================================== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.service-card {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--crimson);
  border-radius: 4px;
  padding: 28px 24px;
  transition: all .25s;
  display: flex;
  flex-direction: column;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow);
  border-top-color: var(--gold);
}
.service-icon {
  font-size: 36px;
  margin-bottom: 12px;
  line-height: 1;
}
.service-name {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--ink);
  margin: 0 0 6px;
  font-weight: 500;
}
.service-tagline {
  font-size: 12.5px;
  color: var(--crimson);
  font-weight: 500;
  margin: 0 0 16px;
  letter-spacing: .02em;
}
.service-features {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  flex: 1;
}
.service-features li {
  padding: 6px 0 6px 20px;
  position: relative;
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.7;
  border-bottom: 1px dashed var(--rule);
}
.service-features li:last-child { border-bottom: none; }
.service-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15px;
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 50%;
}
.service-cta {
  display: inline-block;
  padding: 10px 0;
  color: var(--crimson);
  font-weight: 600;
  font-size: 13.5px;
  text-decoration: none;
  border-top: 1px solid var(--rule);
  transition: color .15s, padding-left .15s;
}
.service-cta:hover {
  color: var(--gold);
  padding-left: 4px;
}

/* 綴じ方の説明 */
.binding-note {
  margin-top: 48px;
  padding: 32px;
  background: var(--paper-off);
  border-left: 3px solid var(--gold);
  border-radius: 0 4px 4px 0;
}
.binding-note h3 {
  font-family: var(--serif);
  color: var(--ink);
  font-size: 20px;
  margin: 0 0 20px;
}
.binding-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.binding-methods > div {
  padding: 16px 18px;
  background: var(--paper-white);
  border-radius: 3px;
  border: 1px solid var(--rule);
}
.binding-methods strong {
  display: block;
  color: var(--crimson);
  font-family: var(--serif);
  font-size: 15px;
  margin-bottom: 6px;
}
.binding-methods p {
  font-size: 12.5px;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0;
}

@media (max-width: 720px) {
  .service-grid { grid-template-columns: 1fr; gap: 16px; }
  .service-card { padding: 22px 18px; }
  .service-icon { font-size: 30px; }
  .service-name { font-size: 17px; }
  .binding-note { padding: 22px 18px; }
}

/* ==========================================================================
   SITUATION CARDS (用途・シチュエーション別)
   ========================================================================== */
.situation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.situation-card {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 28px 26px;
  position: relative;
  transition: all .25s;
}
.situation-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px var(--shadow);
  border-color: var(--gold);
}
.situation-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--crimson);
  color: var(--paper-white);
  font-size: 11px;
  font-weight: 600;
  border-radius: 2px;
  margin-bottom: 14px;
  letter-spacing: .04em;
}
.situation-card h3 {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--ink);
  margin: 0 0 12px;
  line-height: 1.5;
  font-weight: 500;
}
.situation-card p {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0 0 12px;
}
.situation-suggest {
  padding: 10px 12px;
  background: var(--paper-off);
  border-left: 2px solid var(--gold);
  border-radius: 0 3px 3px 0;
  font-size: 12.5px !important;
  color: var(--ink) !important;
  margin: 12px 0 0 !important;
}
.situation-suggest strong {
  color: var(--crimson);
  font-weight: 600;
}

@media (max-width: 720px) {
  .situation-grid { grid-template-columns: 1fr; gap: 16px; }
  .situation-card { padding: 22px 20px; }
  .situation-card h3 { font-size: 16px; }
  .situation-card p { font-size: 13px; }
}

/* ==========================================================================
   OCCASION QUICK LINKS (トップページ「用途で選ぶ」導線)
   ========================================================================== */
.occasion-quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-top: 40px;
}
.occasion-quick-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 24px 16px;
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  transition: all .2s;
  min-height: 110px;
}
.occasion-quick-card:hover {
  transform: translateY(-3px);
  background: var(--paper-off);
  border-color: var(--crimson);
  box-shadow: 0 8px 20px var(--shadow);
}
.occasion-icon {
  font-size: 32px;
  line-height: 1;
}
.occasion-label {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--ink);
  font-weight: 500;
  text-align: center;
}
.occasion-quick-card:hover .occasion-label {
  color: var(--crimson);
}

@media (max-width: 720px) {
  .occasion-quick-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .occasion-quick-card { padding: 18px 10px; min-height: 90px; }
  .occasion-icon { font-size: 26px; }
  .occasion-label { font-size: 12.5px; }
}

/* ==========================================================================
   NAV: 中間画面幅対策（AI拡張パネル等で狭くなるケース）
   ========================================================================== */
@media (max-width: 1100px) and (min-width: 721px) {
  .nav { gap: 14px; }
  .nav a { font-size: 13px; letter-spacing: 0.03em; }
  .nav-cta { padding: 8px 14px !important; font-size: 12px !important; }
  .brand-en { display: none; }
}