/* ============================================
   LUMÉ ブライトニングセラム — 制作サンプル (AIA Web Studio)
   ============================================ */

:root {
  --ink: #43342f;
  --ink-soft: #8a7a72;
  --coral: #f0764f;
  --coral-deep: #e35a30;
  --peach: #fff3ec;
  --peach-deep: #ffe2d2;
  --cream: #fffaf6;
  --gold: #c98a3c;
  --sans: "Noto Sans JP", sans-serif;
  --display: "Poppins", "Noto Sans JP", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
.sp-only { display: none; }

.demo-bar {
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  padding: 8px 20px;
  display: flex; align-items: center; justify-content: center; gap: 18px; flex-wrap: wrap;
}
.demo-bar a { text-decoration: underline; opacity: 0.85; }

/* Buttons */
.btn {
  display: inline-block;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  padding: 16px 38px;
  border-radius: 999px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn--main { background: var(--coral); color: #fff; box-shadow: 0 10px 26px rgba(227,90,48,0.4); }
.btn--main:hover { background: var(--coral-deep); transform: translateY(-2px); box-shadow: 0 14px 30px rgba(227,90,48,0.46); }
.btn--big { font-size: 18px; padding: 20px 56px; }

.label { font-family: var(--display); font-size: 13px; font-weight: 600; letter-spacing: 0.22em; color: var(--coral); margin-bottom: 12px; }
.label--center { text-align: center; }
.sec-title { font-size: clamp(24px, 4vw, 34px); font-weight: 900; line-height: 1.5; letter-spacing: 0.02em; margin-bottom: 44px; }
.sec-title--center { text-align: center; }
.sec-title--light { color: #fff; }

/* Hero */
.hero {
  background: radial-gradient(120% 120% at 80% 0%, var(--peach-deep), var(--peach) 55%, var(--cream));
  padding: 70px 28px 90px;
  overflow: hidden;
}
.hero__inner {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center;
}
.hero__tag { font-family: var(--display); font-size: 13px; font-weight: 600; letter-spacing: 0.2em; color: var(--coral-deep); margin-bottom: 18px; }
.hero__title { font-size: clamp(40px, 7vw, 72px); font-weight: 900; line-height: 1.25; letter-spacing: 0.01em; margin-bottom: 24px; }
.hero__title em { font-style: normal; color: var(--coral); position: relative; }
.hero__title em::after { content: ""; position: absolute; left: 0; right: 0; bottom: 6px; height: 12px; background: var(--peach-deep); z-index: -1; border-radius: 4px; }
.hero__lead { font-size: 16px; color: var(--ink-soft); margin-bottom: 34px; }
.hero__cta .btn { margin-bottom: 12px; }
.hero__note { font-size: 13px; color: var(--ink-soft); }
.hero__visual {
  border-radius: 24px; overflow: hidden;
  box-shadow: 0 30px 60px rgba(227,90,48,0.22);
  aspect-ratio: 4/5;
}
.hero__visual img { width: 100%; height: 100%; object-fit: cover; }

/* 悩み */
.worry { background: var(--cream); padding: 90px 28px; }
.worry__inner { max-width: 760px; margin: 0 auto; text-align: center; }
.worry__title { font-size: clamp(22px, 3.6vw, 30px); font-weight: 900; line-height: 1.5; margin-bottom: 40px; }
.worry__list { display: grid; gap: 14px; text-align: left; }
.worry__list li {
  background: var(--peach); border-radius: 12px; padding: 16px 22px 16px 54px;
  font-size: 15px; font-weight: 500; position: relative;
}
.worry__list li::before {
  content: "✓"; position: absolute; left: 22px; top: 50%; transform: translateY(-50%);
  width: 22px; height: 22px; border-radius: 50%; background: var(--coral); color: #fff;
  font-size: 13px; display: grid; place-items: center;
}
.worry__bridge { font-size: clamp(17px, 2.6vw, 22px); font-weight: 700; margin-top: 38px; }
.worry__bridge strong { color: var(--coral-deep); }

/* 特徴 */
.feature { background: var(--peach); padding: 96px 28px; }
.feature__inner { max-width: 1100px; margin: 0 auto; text-align: center; }
.feature__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feat {
  background: #fff; border-radius: 18px; padding: 44px 28px 32px;
  position: relative; box-shadow: 0 14px 34px rgba(227,90,48,0.08); text-align: center;
}
.feat__no {
  position: absolute; top: -22px; left: 50%; transform: translateX(-50%);
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--coral); color: #fff; font-family: var(--display); font-weight: 700;
  display: grid; place-items: center; box-shadow: 0 8px 18px rgba(227,90,48,0.35);
}
.feat h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.feat p { font-size: 14px; color: var(--ink-soft); }

/* 成分 */
.ingredient { display: grid; grid-template-columns: 1fr 1fr; align-items: stretch; }
.ingredient__media {
  min-height: 440px;
  background:
    linear-gradient(rgba(180,70,40,0.08), rgba(180,70,40,0.08)),
    url("img/ingredient.jpg") center / cover no-repeat, var(--peach-deep);
}
.ingredient__text {
  background: var(--coral);
  color: #fff;
  padding: 80px 8% ;
  display: flex; flex-direction: column; justify-content: center;
}
.ingredient__text .label { color: #ffe2d2; }
.ingredient__text p { font-size: 15px; opacity: 0.95; }

/* お客様の声 */
.voice { background: var(--cream); padding: 96px 28px; }
.voice__inner { max-width: 1100px; margin: 0 auto; }
.voice__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.vcard { background: #fff; border-radius: 16px; padding: 30px 28px; box-shadow: 0 12px 30px rgba(67,52,47,0.07); }
.vcard__stars { color: var(--coral); font-size: 15px; letter-spacing: 2px; margin-bottom: 14px; }
.vcard blockquote { font-size: 15px; line-height: 1.9; margin-bottom: 16px; }
.vcard figcaption { font-size: 13px; color: var(--ink-soft); font-weight: 700; }
.voice__note { text-align: center; font-size: 12px; color: var(--ink-soft); margin-top: 30px; }

/* オファー */
.offer { background: radial-gradient(120% 120% at 50% 0%, var(--peach-deep), var(--peach)); padding: 96px 28px; }
.offer__inner {
  max-width: 620px; margin: 0 auto; text-align: center;
  background: #fff; border-radius: 26px; padding: 56px 40px;
  box-shadow: 0 24px 60px rgba(227,90,48,0.18);
}
.offer__lead { display: inline-block; background: var(--ink); color: #fff; font-size: 13px; font-weight: 700; padding: 6px 20px; border-radius: 999px; margin-bottom: 24px; }
.offer__title { font-size: clamp(24px, 4vw, 34px); font-weight: 900; line-height: 1.45; margin-bottom: 28px; }
.offer__price { display: flex; flex-direction: column; align-items: center; gap: 4px; margin-bottom: 26px; }
.offer__old { font-size: 15px; color: var(--ink-soft); text-decoration: line-through; }
.offer__now { font-family: var(--display); font-size: 30px; font-weight: 700; color: var(--coral-deep); }
.offer__now em { font-style: normal; font-size: 60px; }
.offer__now small { font-size: 14px; }
.offer__off { background: var(--coral); color: #fff; font-weight: 700; font-size: 14px; padding: 4px 16px; border-radius: 999px; }
.offer__perks { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px 18px; margin-bottom: 30px; }
.offer__perks li { font-size: 13px; font-weight: 700; padding-left: 22px; position: relative; }
.offer__perks li::before { content: "✓"; position: absolute; left: 0; color: var(--coral); }
.offer__small { font-size: 11px; color: var(--ink-soft); margin-top: 18px; }

/* FAQ */
.faq { background: var(--cream); padding: 96px 28px 110px; }
.faq__inner { max-width: 720px; margin: 0 auto; }
.faq__list { display: grid; gap: 12px; }
.faq details { background: #fff; border-radius: 12px; padding: 0 22px; box-shadow: 0 8px 22px rgba(67,52,47,0.05); }
.faq summary { cursor: pointer; list-style: none; font-weight: 700; font-size: 15px; padding: 20px 30px 20px 0; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 2px; top: 50%; transform: translateY(-50%); font-family: var(--display); font-size: 22px; color: var(--coral); transition: transform 0.2s ease; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { font-size: 14px; color: var(--ink-soft); padding: 0 0 22px; }

/* Footer */
.footer { background: var(--ink); color: #fff; text-align: center; padding: 54px 24px 90px; }
.footer__logo { font-family: var(--display); font-size: 26px; font-weight: 700; letter-spacing: 0.1em; margin-bottom: 10px; }
.footer__copy { font-size: 12px; opacity: 0.7; }
.footer__credit { font-size: 11px; opacity: 0.45; margin-top: 8px; }

/* 追従CTA */
.sticky-cta {
  position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%);
  background: var(--coral); color: #fff; font-weight: 700; font-size: 15px;
  padding: 15px 34px; border-radius: 999px;
  box-shadow: 0 12px 30px rgba(227,90,48,0.45);
  z-index: 40; white-space: nowrap;
  transition: transform 0.2s ease, background 0.2s ease;
}
.sticky-cta:hover { background: var(--coral-deep); transform: translateX(-50%) translateY(-2px); }

/* Animation */
.fade-up { opacity: 0; transform: translateY(26px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-up.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .fade-up { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* Responsive */
@media (max-width: 860px) {
  .hero__inner { grid-template-columns: 1fr; gap: 36px; }
  .hero__visual { max-width: 360px; margin: 0 auto; order: -1; }
  .feature__grid, .voice__grid { grid-template-columns: 1fr; }
  .feat { margin-top: 14px; }
  .ingredient { grid-template-columns: 1fr; }
  .ingredient__media { min-height: 300px; order: -1; }
  .ingredient__text { padding: 56px 28px; }
  .sp-only { display: inline; }
}