@charset "UTF-8";

:root {
  --gold: #d5ae00;
  --gold-dark: #b59000;
  --ink: #3b342c;
  --cream: #fff9df;
  --cream-2: #fffdf3;
  --menu: #b19227;
  --menu-hover: #8d6f12;
  --red: #b51a20;
  --page-width: 510px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #f4f0e8;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}
img { display: block; max-width: 100%; height: auto; }
a, a:visited, a:hover, a:focus, a:active { color: inherit; text-decoration: none; }

.page-bg {
  min-height: 100vh;
  padding: 0 16px;
  background: url("./assets/back.jpg") center top / cover fixed no-repeat;
}

.lp {
  width: 100%;
  max-width: var(--page-width);
  margin: 0 auto;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 0 34px rgba(82, 68, 39, .12);
}

.kv { line-height: 0; }
.kv img { width: 100%; }
.inner { padding: 0 34px; }
.inner--narrow { padding-inline: 42px; }

.lead {
  padding: 48px 0 54px;
  background: #fff;
  text-align: center;
}
.lead h2,
.message h2,
.step-block h2,
.colors > h2,
.combination h2,
.offer h2 {
  margin: 0;
  color: var(--gold-dark);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  letter-spacing: .08em;
}
.lead h2 { margin-bottom: 28px; font-size: 24px; }
.lead p { margin: 13px 0; font-size: 17px; line-height: 2; }

.trouble {
  position: relative;
  margin-bottom: 32px;
  padding: 44px 34px 56px;
  background: #f2f2f2;
}
.trouble::after {
  content: "";
  position: absolute;
  bottom: -32px;
  left: 0;
  width: 100%;
  height: 32px;
  background: #f2f2f2;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}
.trouble h2 {
  margin: 0 0 28px;
  color: #3d3935;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 24px;
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: .1em;
  text-align: center;
}
.trouble__body {
  display: grid;
  grid-template-columns: 1fr 150px;
  gap: 18px;
  align-items: center;
}
.trouble ul { margin: 0; padding: 0; list-style: none; }
.trouble li {
  margin: 0 0 10px;
  padding: 9px 10px;
  background: #dedede;
  font-size: 16px;
  text-align: center;
  opacity: 0;
  transform: translateX(-28px);
  transition: opacity .55s ease, transform .55s ease;
}
.trouble li.is-show { opacity: 1; transform: none; }
.trouble__body img { width: 150px; border-radius: 50%; }

.message {
  padding: 60px 20px 66px;
  background: #fff;
  text-align: center;
}
.message p {
  margin: 0 0 12px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 20px;
  letter-spacing: .12em;
}
.message h2 { font-size: 31px; }

.step-block {
  padding: 28px 0 46px;
  background: var(--cream);
  text-align: center;
}
.step-block--cream { background: #fff8de; }
.step-label {
  display: inline-block;
  min-width: 92px;
  padding: 6px 20px;
  background: var(--gold);
  color: #fff;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 13px;
  letter-spacing: .1em;
}
.step-block h2 {
  padding: 23px 32px 26px;
  font-size: 22px;
  line-height: 1.55;
}
.hero-product { width: 100%; }
.hero-product--wide { width: 100%; }
.copy-block { padding: 28px 38px 0; }
.copy-block p {
  margin: 0 0 14px;
  font-size: 18px;
  line-height: 1.95;
  text-align: left;
}

.colors { padding: 50px 34px 58px; background: #fff; }
.eyebrow {
  margin: 0 0 8px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 17px;
  text-align: center;
}
.colors > h2 { margin-bottom: 28px; font-size: 31px; text-align: center; }
.color-card { margin-bottom: 28px; }
.color-card:last-child { margin-bottom: 0; }
.color-card h3 {
  margin: 0;
  padding: 6px 10px;
  background: var(--gold);
  color: #fff;
  font-size: 18px;
  font-weight: 500;
}
.color-card__body {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 18px;
  align-items: center;
  padding-top: 10px;
}
.color-card__body img { width: 160px; }
.color-card__body p { margin: 0; font-size: 17px; line-height: 1.85; }

.combination {
  padding: 52px 38px 58px;
  background: var(--cream-2);
  text-align: center;
}
.combination h2 { font-size: 34px; }
.combination__lead {
  margin: 8px 0 22px;
  color: var(--gold-dark);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 18px;
  line-height: 1.6;
}
.combination > p:not(.combination__lead) { margin: 0 0 24px; font-size: 17px; line-height: 1.85; }
.combination img { width: 100%; }

.offer {
  padding: 58px 34px 64px;
  background: #fff;
  text-align: center;
}
.label {
  display: inline-block;
  padding: 7px 22px;
  background: var(--gold);
  color: #fff;
  font-size: 17px;
  letter-spacing: .13em;
}
.offer h2 { margin: 16px 0 24px; font-size: 30px; line-height: 1.4; }
.set-img { width: 92%; margin: 0 auto 18px; }
.regular {
  position: relative;
  display: inline-block;
  margin: 0 0 10px;
  font-size: 17px;
}
.regular::after {
  content: "";
  position: absolute;
  top: 50%;
  left: -2%;
  width: 104%;
  border-top: 1.5px solid var(--red);
  transform: rotate(-6deg);
  transform-origin: center;
}
.price { display: flex; justify-content: center; align-items: flex-end; gap: 10px; }
.price span {
  margin-bottom: 3px;
  padding: 4px 7px;
  border: 1px solid var(--gold-dark);
  color: var(--gold-dark);
  font-size: 14px;
  line-height: 1.25;
}
.price strong {
  color: var(--red);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 48px;
  line-height: 1;
}
.price strong i { font-size: .68em; font-style: normal; }
.tax { margin: 4px 0 22px; color: var(--red); font-size: 15px; }
.btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 278px;
  height: 56px;
  margin: 0 auto;
  background: linear-gradient(#ddba18, #c49d00);
  box-shadow: 0 8px 16px rgba(164, 124, 0, .2);
  color: #fff !important;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 19px;
  letter-spacing: .14em;
}
.btn::after { content: "›"; position: absolute; right: 18px; font-size: 25px; }

.marker {
  display: inline;
  padding: 0 .05em;
  background: linear-gradient(transparent 55%, #fff0a5 55%, #fff0a5 95%, transparent 95%) left center / 0 100% no-repeat;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  transition: background-size 1s ease;
}
.marker.is-show { background-size: 100% 100%; }

/* 左側：参考ファイルと同じ固定配置 */
.side--left {
  position: fixed;
  z-index: 100;
  top: 120px;
  left: 50%;
  width: 180px;
  margin-left: -520px;
}
.brand-block { text-align: center; }
.brand-logo { width: 160px; margin: 0 auto 20px; }
.brand-logo img { width: 100%; }
.official-btn {
  display: block;
  padding: 14px 20px;
  border-radius: 4px;
  background: rgba(213, 174, 0, .88);
  color: #fff !important;
  font-size: 17px;
  letter-spacing: .12em;
  transition: transform .3s ease, background-color .3s ease;
}
.official-btn:hover { background: var(--gold-dark); transform: translateY(-2px); }

/* 右側：参考ファイルと同じ縦型固定メニュー */
.side-nav {
  position: fixed;
  z-index: 20;
  top: 135px;
  left: calc(50% + 300px);
  display: flex;
  flex-direction: column;
  gap: 30px;
}
.side-nav a {
  position: relative;
  display: inline-block;
  color: var(--menu) !important;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: .16em;
  text-shadow: 0 1px 8px rgba(255,255,255,.85);
  transition: color .3s ease, opacity .3s ease, transform .3s ease;
}
.side-nav a::after {
  content: "";
  position: absolute;
  bottom: -7px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width .3s ease;
}
.side-nav a:hover { color: var(--menu-hover) !important; opacity: .78; transform: translateX(4px); }
.side-nav a:hover::after { width: 100%; }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity .75s ease, transform .75s ease; }
.reveal.is-show { opacity: 1; transform: none; }

@media (max-width: 1100px) {
  .side--left, .side-nav { display: none; }
}

@media (max-width: 540px) {
  .page-bg { padding: 0; background-attachment: scroll; }
  .inner, .inner--narrow { padding-inline: 26px; }
  .lead { padding: 42px 0 48px; }
  .lead h2 { font-size: 21px; }
  .trouble { padding: 42px 26px 52px; }
  .trouble h2 { font-size: 21px; }
  .trouble__body { grid-template-columns: 1fr 118px; gap: 12px; }
  .trouble__body img { width: 118px; }
  .trouble li { font-size: 13px; }
  .message h2 { font-size: 27px; }
  .step-block h2 { font-size: 20px; }
  .copy-block { padding: 24px 28px 0; }
  .colors { padding: 46px 26px 52px; }
  .colors > h2 { font-size: 28px; }
  .color-card__body { grid-template-columns: 145px 1fr; gap: 14px; }
  .color-card__body img { width: 145px; }
  .offer { padding: 52px 28px 58px; }
  .offer h2 { font-size: 27px; }
  .price strong { font-size: 44px; }
  .btn { width: 270px; font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}