/* ============================================================
   LUMIERE SKIN — B案: ラグジュアリー
   Black x Gold Luxury Skincare LP
   ============================================================ */

/* Root Variables */
:root {
  --color-primary: #2C2C2C;
  --color-accent: #BEA67A;
  --color-accent-light: #D4C49A;
  --color-text: #2C2C2C;
  --color-text-muted: #808080;
  --color-bg: #FFFFFF;
  --color-bg-section: #F9F6F0;
  --color-border: #E0D8CC;
  --color-footer-bg: #1A1A1A;

  --font-sans: 'Noto Sans JP', sans-serif;
  --font-serif: 'Cormorant Garamond', serif;

  --max-width: 1140px;
  --section-padding: 120px 0;
  --transition: 0.35s ease;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ============================================================
   Utilities
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

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

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Section header */
.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-eyebrow {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-eyebrow.light {
  color: var(--color-accent-light);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  line-height: 1.3;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  width: 60px;
  margin: 28px 0 0;
}

.section-divider.center {
  margin: 28px auto 0;
}

/* ============================================================
   Header / Navigation
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  color: var(--color-primary);
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-links a {
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-accent);
}

.nav-links .nav-cta {
  display: inline-block;
  padding: 8px 20px;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  transition: background-color var(--transition), color var(--transition);
}

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

/* Hamburger */
.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-color: var(--color-primary);
  transition: transform var(--transition), opacity var(--transition);
}

.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;
  background-image: url('https://images.pexels.com/photos/2735037/pexels-photo-2735037.jpeg?auto=compress&cs=tinysrgb&w=1920&h=1080&fit=crop');
  background-size: cover;
  background-position: center;
  padding: 160px 0;
  text-align: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0 24px;
}

.hero-eyebrow {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 300;
  color: #fff;
  line-height: 1.25;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 0.95rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.82);
  letter-spacing: 0.08em;
  margin-bottom: 52px;
}

/* ============================================================
   CTA Button
   ============================================================ */
.cta-btn {
  display: inline-block;
  padding: 16px 48px;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  transition: background-color var(--transition), color var(--transition);
}

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

.cta-btn-light {
  border-color: rgba(255, 255, 255, 0.7);
  color: #fff;
}

.cta-btn-light:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
}

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

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

.concept-text .section-eyebrow {
  margin-bottom: 20px;
}

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

.concept-body {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 2;
  margin-bottom: 20px;
}

.concept-image img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  border-radius: 4px;
}

/* ============================================================
   Products Section
   ============================================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.product-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.product-card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

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

.product-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.product-card:hover .product-image-wrap img {
  transform: scale(1.04);
}

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

.product-category {
  font-family: var(--font-serif);
  font-size: 0.72rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.product-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.product-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 20px;
}

.product-price {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--color-accent);
  letter-spacing: 0.06em;
}

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

.commitment-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.commitment-card {
  padding: 48px 36px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  text-align: center;
}

.commitment-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--color-accent);
  width: 72px;
  height: 72px;
  border: 1px solid var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
  letter-spacing: 0.04em;
}

.commitment-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

.commitment-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 2;
}

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

.review-card {
  padding: 40px 32px;
  background-color: var(--color-bg-section);
  border-left: 2px solid var(--color-accent);
  border-radius: 0 4px 4px 0;
}

.review-text {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-primary);
  margin-bottom: 24px;
}

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

.review-stars {
  color: var(--color-accent);
  font-size: 0.8rem;
  letter-spacing: 2px;
}

.review-card cite {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

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

.faq-inner {
  max-width: 760px;
}

.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;
  width: 100%;
  padding: 24px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-primary);
  text-align: left;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

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

.faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
  margin-left: 16px;
}

.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  background-color: var(--color-accent);
  transition: transform var(--transition), opacity var(--transition);
}

.faq-icon::before {
  width: 100%;
  height: 1px;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.faq-icon::after {
  width: 1px;
  height: 100%;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

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

.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0;
}

.faq-answer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 2;
  padding-bottom: 24px;
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

/* ============================================================
   CTA Section
   ============================================================ */
.cta-section {
  background-color: var(--color-primary);
  text-align: center;
}

.cta-inner {
  max-width: 680px;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  color: #fff;
  line-height: 1.35;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
}

.cta-subtitle {
  font-size: 0.88rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.65);
  line-height: 2;
  margin-bottom: 48px;
  letter-spacing: 0.06em;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-footer-bg);
  padding: 64px 0 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  text-align: center;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.12em;
}

.footer-sns {
  display: flex;
  align-items: center;
  gap: 24px;
}

.sns-link {
  opacity: 0.55;
  transition: opacity var(--transition);
  filter: invert(1);
}

.sns-link:hover {
  opacity: 1;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.73rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.08em;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--color-accent);
}

.footer-copy {
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.25);
  letter-spacing: 0.1em;
}

/* ============================================================
   Responsive: Tablet & Mobile (max-width: 768px)
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }

  .container {
    padding: 0 20px;
  }

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

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: 32px 24px;
    gap: 24px;
    align-items: flex-start;
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s ease, opacity 0.35s ease;
    z-index: 99;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    font-size: 0.9rem;
  }

  .nav-links .nav-cta {
    margin-top: 8px;
  }

  /* Hero */
  .hero {
    min-height: 70vh;
    padding: 120px 0;
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  /* Concept */
  .concept-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .concept-image img {
    height: 280px;
  }

  /* Products */
  .products-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .commitment-card {
    padding: 36px 28px;
  }

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

  /* FAQ */
  .faq-inner {
    max-width: 100%;
  }

  /* Footer */
  .footer-nav {
    gap: 20px;
  }
}