/* =============================================
   ZEN Global Beauty — style.css
   白・シルバー / ラボ・研究所感
   ============================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --white:       #FFFFFF;
  --off-white:   #F7F8FA;
  --light:       #EEF0F4;
  --silver:      #9AA5B4;
  --silver-light:#C8D0DB;
  --silver-pale: #E8ECF1;
  --charcoal:    #1C2333;
  --mid:         #4A5568;
  --muted:       #8896A8;
  --accent:      #2C5F8A;
  --accent-light:#4A7FA8;
  --border:      #DDE2EA;
  --font-serif:  'Cormorant Garamond', 'Noto Serif JP', Georgia, serif;
  --font-sans:   'DM Sans', 'Noto Sans JP', 'Helvetica Neue', sans-serif;
  --max-width:   1200px;
  --section-pad: 7rem 2rem;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--charcoal);
  font-weight: 300;
  line-height: 1.8;
  font-size: 15px;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }

/* =============================================
   HEADER
   ============================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: 0 2px 24px rgba(28,35,51,0.08); }

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-zen {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--charcoal);
}
.logo-divider {
  width: 1px;
  height: 16px;
  background: var(--silver-light);
  display: block;
}
.logo-sub {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--silver);
  font-weight: 400;
  text-transform: uppercase;
}

.nav-menu { display: flex; align-items: center; gap: 2rem; }
.nav-menu ul { display: flex; gap: 2rem; list-style: none; }
.nav-menu a {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mid);
  transition: color 0.2s;
}
.nav-menu a:hover { color: var(--accent); }

.btn-nav {
  background: var(--charcoal);
  color: var(--white) !important;
  padding: 9px 20px;
  font-size: 11px;
  letter-spacing: 0.12em;
  transition: background 0.3s;
  white-space: nowrap;
}
.btn-nav:hover { background: var(--accent) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--charcoal);
  transition: transform 0.3s, opacity 0.3s;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn-primary {
  display: inline-block;
  background: var(--charcoal);
  color: var(--white);
  padding: 13px 30px;
  font-size: 12px;
  letter-spacing: 0.15em;
  transition: background 0.3s;
  font-family: var(--font-sans);
}
.btn-primary:hover { background: var(--accent); }

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--charcoal);
  border: 1px solid var(--charcoal);
  padding: 12px 28px;
  font-size: 12px;
  letter-spacing: 0.15em;
  transition: all 0.3s;
}
.btn-outline:hover { background: var(--charcoal); color: var(--white); }

/* =============================================
   SECTION COMMON
   ============================================= */
.section-label {
  display: block;
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--silver);
  margin-bottom: 1.25rem;
  font-family: var(--font-sans);
}
.section-header { text-align: center; margin-bottom: 4rem; }
.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 3.5vw, 46px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: 0.03em;
  margin-bottom: 1rem;
  color: var(--charcoal);
}
.section-header h2 em { font-style: italic; color: var(--accent); }
.section-header p { font-size: 14px; color: var(--mid); line-height: 2; letter-spacing: 0.05em; }

/* =============================================
   HERO
   ============================================= */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding-top: 68px;
  background: var(--off-white);
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
}

.hero-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 5rem 4rem 5rem 5rem;
  z-index: 1;
}
.hero-label-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}
.hero-label-line {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--silver);
}
.hero-label-text {
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--silver);
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(38px, 4vw, 58px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  color: var(--charcoal);
}
.hero-title em { font-style: italic; color: var(--accent); }

.hero-subtitle {
  font-size: 14px;
  color: var(--mid);
  letter-spacing: 0.08em;
  line-height: 2;
  margin-bottom: 2.5rem;
}

.hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem; }

.hero-stats {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.hero-stat { display: flex; flex-direction: column; gap: 2px; }
.stat-val {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 400;
  color: var(--charcoal);
  letter-spacing: 0.05em;
}
.stat-label {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--silver);
  text-transform: uppercase;
}
.hero-stat-divider {
  width: 1px;
  height: 32px;
  background: var(--border);
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 3rem;
  z-index: 1;
}
.hero-visual-frame {
  position: relative;
  width: 100%;
  max-width: 480px;
  border: 1px solid var(--border);
  background: var(--white);
  overflow: hidden;
}
.hero-visual-frame img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.hero-visual-frame::before {
  content: 'ZEN矯正歯科 銀座';
  display: block;
  padding: 0.75rem 1rem;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--silver);
  border-bottom: 1px solid var(--border);
  background: var(--off-white);
}
.hero-visual-label {
  padding: 0.75rem 1rem;
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--silver);
  border-top: 1px solid var(--border);
  background: var(--off-white);
  display: none;
}

/* =============================================
   CONCEPT
   ============================================= */
.concept { padding: var(--section-pad); background: var(--white); }
.concept-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.concept-card {
  background: var(--white);
  padding: 2.5rem 1.75rem;
  transition: background 0.3s;
}
.concept-card:hover { background: var(--off-white); }
.concept-icon { margin-bottom: 1.5rem; opacity: 0.6; }
.concept-num {
  display: block;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--silver);
  margin-bottom: 0.75rem;
}
.concept-card h3 {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
  color: var(--charcoal);
}
.concept-card p { font-size: 12px; color: var(--muted); line-height: 1.9; }

/* =============================================
   CLINIC BANNER
   ============================================= */
.clinic-banner {
  padding: var(--section-pad);
  background: var(--charcoal);
  text-align: center;
}
.banner-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--silver);
}
.banner-label-line {
  display: block;
  width: 40px;
  height: 1px;
  background: var(--silver);
  opacity: 0.4;
}
.banner-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 300;
  color: var(--white);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}
.banner-title em { font-style: italic; color: var(--silver-light); }
.banner-desc {
  font-size: 14px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.08em;
  margin-bottom: 2.5rem;
}
.banner-treatments {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.06);
  max-width: 800px;
  margin: 0 auto 2.5rem;
}
.banner-treatment {
  background: rgba(255,255,255,0.03);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.bt-name {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.8);
}
.bt-detail {
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.3);
}

/* =============================================
   COLUMN
   ============================================= */
.columns-section { padding: var(--section-pad); background: var(--off-white); }
.column-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.column-card {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 2rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.column-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(44,95,138,0.08);
}
.column-card--featured {
  grid-column: span 2;
  background: var(--charcoal);
  border-color: transparent;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}
.column-card--featured:hover { border-color: transparent; }
.column-card--featured h3 { color: var(--white); }
.column-card--featured p { color: rgba(255,255,255,0.5); }
.column-card--featured .column-link { color: var(--silver-light); }

.column-meta { margin-bottom: 1rem; }
.column-tag {
  display: inline-block;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--accent);
  border: 1px solid rgba(44,95,138,0.3);
  padding: 3px 10px;
  text-transform: uppercase;
}
.column-card--featured .column-tag {
  color: var(--silver-light);
  border-color: rgba(200,208,219,0.3);
}
.column-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 300;
  letter-spacing: 0.03em;
  margin-bottom: 0.75rem;
  line-height: 1.4;
  color: var(--charcoal);
}
.column-card p {
  font-size: 13px;
  color: var(--mid);
  line-height: 1.9;
  letter-spacing: 0.03em;
  margin-bottom: 1.25rem;
}
.column-link {
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--accent);
  transition: opacity 0.2s;
}
.column-link:hover { opacity: 0.7; }
.column-more { text-align: center; }

/* =============================================
   SHOP
   ============================================= */
.shop-section { padding: var(--section-pad); background: var(--white); }
.shop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.shop-card {
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.3s;
}
.shop-card:hover { border-color: var(--silver); }
.shop-img {
  aspect-ratio: 4/3;
  background: var(--off-white);
  overflow: hidden;
}
.shop-img img { width: 100%; height: 100%; object-fit: cover; }
.shop-img.empty::before {
  content: '商品画像';
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 11px;
  color: var(--silver);
  letter-spacing: 0.15em;
}
.shop-body { padding: 1.5rem; }
.shop-tag {
  display: inline-block;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--accent);
  border: 1px solid rgba(44,95,138,0.25);
  padding: 3px 10px;
  margin-bottom: 0.75rem;
}
.shop-card h3 {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
  color: var(--charcoal);
}
.shop-card p {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.shop-link {
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--accent);
}
.shop-link:hover { opacity: 0.7; }
.shop-disclaimer {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  line-height: 2;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

/* =============================================
   PHILOSOPHY TEASER
   ============================================= */
.philosophy-teaser { padding: var(--section-pad); background: var(--off-white); }
.philosophy-inner {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 5rem;
  align-items: center;
}
.quote-mark {
  font-family: var(--font-serif);
  font-size: 80px;
  line-height: 0.5;
  color: var(--border);
  display: block;
  margin-bottom: 1.5rem;
}
blockquote {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: var(--charcoal);
  margin-bottom: 2rem;
  border-left: 2px solid var(--accent);
  padding-left: 1.5rem;
}
.quote-author { margin-bottom: 2rem; }
.author-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}
.author-title {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
  line-height: 1.8;
}
.philosophy-img {
  aspect-ratio: 3/4;
  background: var(--light);
  border: 1px solid var(--border);
  overflow: hidden;
}
.philosophy-img img { width: 100%; height: 100%; object-fit: cover; }
.philosophy-img.empty::before {
  content: '監修医写真';
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 11px;
  color: var(--silver);
  letter-spacing: 0.15em;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: var(--charcoal);
  padding: 3rem 2rem;
  text-align: center;
}
.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 1.5rem;
}
.footer-logo .logo-zen {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.5);
}
.footer-logo .logo-divider {
  width: 1px;
  height: 14px;
  background: rgba(255,255,255,0.2);
}
.footer-logo .logo-sub {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.25);
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.footer-nav a {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.3);
  transition: color 0.2s;
}
.footer-nav a:hover { color: rgba(255,255,255,0.7); }
.footer-disclaimer {
  font-size: 10px;
  color: rgba(255,255,255,0.15);
  letter-spacing: 0.04em;
  line-height: 2;
  margin-bottom: 1rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.footer-copy { font-size: 10px; color: rgba(255,255,255,0.15); letter-spacing: 0.12em; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .concept-grid { grid-template-columns: repeat(2, 1fr); }
  .philosophy-inner { grid-template-columns: 1fr; gap: 3rem; }
  .philosophy-img { max-width: 320px; }
  .banner-treatments { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --section-pad: 4rem 1.5rem; }

  .nav-menu ul { display: none; }
  .nav-menu {
    position: fixed;
    inset: 68px 0 0 0;
    background: rgba(255,255,255,0.98);
    flex-direction: column;
    align-items: stretch;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    gap: 0;
    z-index: 99;
    border-top: 1px solid var(--border);
  }
  .nav-menu.open { transform: translateX(0); }
  .nav-menu ul {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 2rem;
  }
  .nav-menu ul li a {
    display: block;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--charcoal);
  }
  .btn-nav { text-align: center; padding: 14px; }
  .nav-toggle { display: flex; }

  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-inner { padding: 3rem 1.5rem; }
  .hero-visual { padding: 2rem 1.5rem; }
  .hero-ctas { flex-direction: column; }

  .column-grid { grid-template-columns: 1fr; }
  .column-card--featured { grid-column: span 1; grid-template-columns: 1fr; }
  .shop-grid { grid-template-columns: 1fr; }
  .banner-treatments { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .concept-grid { grid-template-columns: 1fr; background: none; border: none; gap: 1rem; }
  .concept-card { border: 1px solid var(--border); }
  .banner-treatments { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; gap: 1rem; }
}