/* =============================================
   LUMIERE SKIN — style.css
   コンセプト: 大人かわいい透明感
   ============================================= */

/* ---- カラー変数 ---- */
:root {
  --color-primary: #C9957A;
  --color-primary-light: #DEB8A4;
  --color-primary-pale: #F7EDE7;
  --color-accent: #C9A84C;
  --color-text: #4A3728;
  --color-text-muted: #8A7060;
  --color-bg: #FDFAF8;
  --color-bg-section: #FAF0E6;
  --color-border: #F0D8C8;
  --color-footer-bg: #3D2B1F;

  /* タイポグラフィ */
  --font-body: 'Noto Sans JP', sans-serif;
  --font-serif: 'Playfair Display', serif;

  /* スペーシング */
  --section-padding: 120px 0;
  --container-width: 1100px;
  --container-gutter: 24px;

  /* トランジション */
  --transition-base: 0.3s ease;
}

/* =============================================
   リセット & ベース
   ============================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-base);
}

a:hover {
  opacity: 0.7;
}

/* =============================================
   レイアウト共通
   ============================================= */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-gutter);
}

.section {
  padding: var(--section-padding);
}

/* ---- セクション共通ヘッダー ---- */
.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.section-title em {
  font-style: italic;
  color: var(--color-primary);
}

.section-desc {
  margin-top: 20px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  font-weight: 300;
}

/* =============================================
   スクロールアニメーション
   ============================================= */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   CTA ボタン
   ============================================= */
.cta-btn {
  display: inline-block;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
  padding: 14px 40px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  border-radius: 2px;
  transition: background var(--transition-base), color var(--transition-base);
  cursor: pointer;
}

.cta-btn:hover {
  background: var(--color-primary);
  color: #fff;
  opacity: 1;
}

.cta-btn--large {
  padding: 18px 56px;
  font-size: 1rem;
}

/* =============================================
   HEADER / NAV
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253, 250, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-gutter);
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.14em;
  color: var(--color-text);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.nav-links a:hover {
  color: var(--color-primary);
  opacity: 1;
}

.nav-links .nav-cta {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  padding: 8px 20px;
  border-radius: 2px;
  transition: background var(--transition-base), color var(--transition-base);
}

.nav-links .nav-cta:hover {
  background: var(--color-primary);
  color: #fff;
  opacity: 1;
}

/* ---- ハンバーガー ---- */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.burger span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--color-text);
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 180px 24px;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('https://images.pexels.com/photos/3762879/pexels-photo-3762879.jpeg?auto=compress&cs=tinysrgb&w=1920&h=1080&fit=crop');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* 上品なオーバーレイ */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(253, 250, 248, 0.60);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.hero-label {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 28px;
}

.hero-catch {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.5;
  letter-spacing: 0.06em;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 48px;
  line-height: 2;
}

.hero-cta {
  display: flex;
  justify-content: center;
}

/* =============================================
   CONCEPT
   ============================================= */
.concept {
  background: var(--color-bg);
}

.concept-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.concept-text {
  order: 1;
}

.concept-text .section-label {
  text-align: left;
}

.concept-text .section-title {
  text-align: left;
  margin-bottom: 32px;
}

.concept-body {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 2.2;
  margin-bottom: 20px;
}

.concept-image {
  order: 2;
  border-radius: 12px;
  overflow: hidden;
}

.concept-image img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  display: block;
  border-radius: 12px;
  transition: transform 0.6s ease;
}

.concept-image:hover img {
  transform: scale(1.03);
}

/* =============================================
   PRODUCTS
   ============================================= */
.products {
  background: var(--color-bg-section);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.product-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 20px rgba(74, 55, 40, 0.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(74, 55, 40, 0.1);
}

.product-img-wrap {
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

.product-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-img-wrap img {
  transform: scale(1.05);
}

.product-body {
  padding: 28px 24px 32px;
}

.product-step {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.product-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.product-desc {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 20px;
}

.product-price {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
  letter-spacing: 0.04em;
}

.product-price span {
  font-size: 0.75rem;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  font-weight: 300;
  margin-left: 4px;
}

/* =============================================
   COMMITMENT
   ============================================= */
.commitment {
  background: var(--color-bg);
}

.commitment-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.commitment-item {
  padding: 48px 32px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-align: center;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.commitment-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: 0 4px 24px rgba(201, 149, 122, 0.08);
}

.commitment-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  color: var(--color-primary-light);
  letter-spacing: 0.06em;
  margin-bottom: 20px;
  line-height: 1;
}

.commitment-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.commitment-body {
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 2;
}

/* =============================================
   REVIEWS
   ============================================= */
.reviews {
  background: var(--color-primary-pale);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.review-card {
  background: #fff;
  border-radius: 12px;
  padding: 40px 32px;
  box-shadow: 0 2px 16px rgba(74, 55, 40, 0.05);
  border: none;
}

.review-text {
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--color-text);
  line-height: 2;
  margin-bottom: 24px;
  font-style: italic;
  font-family: var(--font-serif);
}

.review-footer {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-stars {
  color: var(--color-accent);
  font-size: 0.85rem;
  letter-spacing: 2px;
}

.review-author {
  font-size: 0.82rem;
  font-style: normal;
  color: var(--color-text-muted);
  font-weight: 300;
}

/* =============================================
   FAQ
   ============================================= */
.faq {
  background: var(--color-bg);
}

.faq-container {
  max-width: 720px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item:first-of-type {
  border-top: 1px solid var(--color-border);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
  letter-spacing: 0.03em;
  transition: color var(--transition-base);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
}

.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.faq-icon::before {
  width: 14px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.faq-icon::after {
  width: 1px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.faq-item.active .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
  overflow: hidden;
}

.faq-item.active .faq-answer {
  grid-template-rows: 1fr;
}

.faq-answer > p {
  min-height: 0;
  overflow: hidden;
  padding-bottom: 24px;
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 2;
}

/* =============================================
   CTA セクション
   ============================================= */
.cta-section {
  background: var(--color-bg-section);
}

.cta-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 24px;
  margin-top: 16px;
  letter-spacing: 0.05em;
}

.cta-body {
  font-size: 0.92rem;
  font-weight: 300;
  color: var(--color-text-muted);
  line-height: 2.2;
  margin-bottom: 40px;
}

.cta-note {
  margin-top: 20px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 300;
  letter-spacing: 0.04em;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: var(--color-footer-bg);
  color: rgba(253, 250, 248, 0.75);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 48px;
  align-items: start;
  padding: 72px 0 48px;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  letter-spacing: 0.14em;
  color: rgba(253, 250, 248, 0.95);
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 0.8rem;
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 1.8;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav a {
  font-size: 0.82rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: rgba(253, 250, 248, 0.65);
  transition: color var(--transition-base);
}

.footer-nav a:hover {
  color: rgba(253, 250, 248, 0.95);
  opacity: 1;
}

.footer-sns {
  display: flex;
  gap: 16px;
  align-items: center;
  padding-top: 4px;
}

.sns-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(253, 250, 248, 0.2);
  border-radius: 50%;
  transition: border-color var(--transition-base), background var(--transition-base);
}

.sns-link:hover {
  border-color: rgba(253, 250, 248, 0.6);
  background: rgba(253, 250, 248, 0.08);
  opacity: 1;
}

.sns-link img {
  width: 18px;
  height: 18px;
  filter: brightness(0) invert(0.8);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  border-top: 1px solid rgba(253, 250, 248, 0.1);
}

.footer-copy {
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: rgba(253, 250, 248, 0.45);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.75rem;
  font-weight: 300;
  color: rgba(253, 250, 248, 0.45);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: rgba(253, 250, 248, 0.75);
  opacity: 1;
}

/* =============================================
   レスポンシブ (@media max-width: 768px)
   ============================================= */
@media (max-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }

  /* nav */
  .burger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(253, 250, 248, 0.97);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 24px var(--container-gutter);
    gap: 0;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    display: block;
    padding: 16px 0;
    font-size: 0.9rem;
  }

  .nav-links .nav-cta {
    border: none;
    padding: 16px 0;
  }

  /* hero */
  .hero {
    min-height: 80vh;
    padding: 120px 24px;
  }

  .hero-catch {
    font-size: 1.75rem;
  }

  /* concept */
  .concept-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .concept-image {
    order: -1;
  }

  .concept-image img {
    height: 300px;
  }

  .concept-text .section-label,
  .concept-text .section-title {
    text-align: center;
  }

  /* products */
  .products-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    max-width: 480px;
    margin: 0 auto;
  }

  /* commitment */
  .commitment-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* reviews */
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 480px;
    margin: 0 auto;
  }

  /* section header margin */
  .section-header {
    margin-bottom: 48px;
  }

  /* footer */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 56px 0 36px;
  }

  .footer-nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  /* cta-btn on mobile */
  .cta-btn--large {
    padding: 16px 40px;
  }
}