/* ===== CSS Custom Properties ===== */
:root {
  --color-base: #F5F0E8;
  --color-base-sub: #E8DDD0;
  --color-charcoal: #2D2D2D;
  --color-charcoal-deep: #3D3530;
  --color-accent: #C4745A;
  --color-gold: #B8A07A;
  --color-white: #FFFFFF;
  --color-bg-outer: #EDE8E0;
  --font-serif: 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --max-width: 900px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background-color: var(--color-bg-outer); font-family: var(--font-sans); color: var(--color-charcoal); }

/* ===== Page Wrapper ===== */
.sel-page { max-width: var(--max-width); margin: 0 auto; background-color: var(--color-white); }

/* ===== Section Images ===== */
.sel-section-img { display: block; width: 100%; font-size: 0; line-height: 0; }
.sel-section-img img { display: block; width: 100%; height: auto; }

/* ===== Text Area ===== */
.sel-text-area {
  background-color: var(--color-base);
  padding: 48px 40px;
  text-align: center;
}
.sel-text-area__eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.sel-text-area__title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 400;
  color: var(--color-charcoal);
  line-height: 1.6;
  margin-bottom: 20px;
}
.sel-text-area__divider {
  width: 40px;
  height: 1px;
  background-color: var(--color-gold);
  margin: 0 auto 20px;
}
.sel-text-area__body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-charcoal);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== CTA Button ===== */
.sel-cta-block {
  background-color: var(--color-base);
  padding: 40px 24px 48px;
  text-align: center;
}
.sel-cta-btn {
  display: inline-block;
  background-color: var(--color-charcoal-deep);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.12em;
  padding: 16px 48px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background-color 0.25s ease, transform 0.15s ease;
  width: 100%;
  max-width: 400px;
}
.sel-cta-btn:hover { background-color: var(--color-accent); transform: translateY(-1px); }

/* ===== Coupon Block ===== */
.sel-coupon-block {
  background-color: var(--color-charcoal-deep);
  padding: 36px 24px;
  text-align: center;
}
.sel-coupon-block__label {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  margin-bottom: 12px;
}
.sel-coupon-code-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 14px 32px;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin-bottom: 10px;
}
.sel-coupon-code-btn:hover { background-color: #a35e47; }
.sel-coupon-code-btn .icon { font-size: 16px; }
.sel-coupon-copied {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--color-gold);
  height: 18px;
  opacity: 0;
  transition: opacity 0.3s;
}
.sel-coupon-copied.is-show { opacity: 1; }

/* ===== FAQ Block ===== */
.sel-faq {
  background-color: var(--color-base);
  padding: 56px 40px;
}
.sel-faq__title {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 400;
  color: var(--color-charcoal);
  text-align: center;
  margin-bottom: 8px;
}
.sel-faq__title-sub {
  text-align: center;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 36px;
}
.sel-faq__item {
  border-top: 1px solid var(--color-base-sub);
  max-width: 720px;
  margin: 0 auto;
}
.sel-faq__item:last-child { border-bottom: 1px solid var(--color-base-sub); }
.sel-faq__question {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  background: none;
  border: none;
  padding: 20px 0;
  cursor: pointer;
  text-align: left;
  color: var(--color-charcoal);
}
.sel-faq__q-badge {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--color-charcoal);
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}
.sel-faq__q-text {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.6;
}
.sel-faq__q-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 22px;
  font-weight: 300;
  line-height: 1;
  transition: transform 0.3s ease;
  margin-top: 2px;
}
.sel-faq__question[aria-expanded="true"] .sel-faq__q-icon { transform: rotate(45deg); }
.sel-faq__answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease;
}
.sel-faq__answer-inner {
  padding: 0 0 20px 40px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.9;
  color: #5a5a5a;
}

/* ===== Product Selection ===== */
#product-selection {
  background-color: var(--color-white);
  padding: 56px 24px 80px;
}
.sel-product-heading {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 400;
  color: var(--color-charcoal);
  text-align: center;
  margin-bottom: 8px;
}
.sel-product-heading-sub {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-align: center;
  text-transform: uppercase;
  margin-bottom: 40px;
}
.sel-product-divider {
  width: 40px;
  height: 1px;
  background-color: var(--color-gold);
  margin: 0 auto 40px;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .sel-text-area { padding: 36px 20px; }
  .sel-faq { padding: 40px 16px; }
  .sel-cta-block { padding: 32px 16px 40px; }
  #product-selection { padding: 40px 16px 60px; }
}