/* =============================================
   琴引窯 — 共通スタイル
   ============================================= */

:root {
  --clay:      #A0614A;
  --clay-lt:   #C8856C;
  --clay-dk:   #7A4535;
  --sand:      #E8DDD0;
  --sand-dk:   #D0C0AC;
  --soil:      #6B4F3A;
  --ash:       #8C8880;
  --ash-lt:    #B0ABA5;
  --smoke:     #F4EFE9;
  --ink:       #2C2420;
  --white:     #FAF7F4;
  --serif:     'Shippori Mincho', 'Noto Serif JP', serif;
  --sans:      'Noto Sans JP', sans-serif;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
img { display: block; max-width: 100%; }

body {
  font-family: var(--sans);
  background: var(--white);
  color: var(--ink);
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}

/* ── Nav ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.2rem 2.5rem;
  background: rgba(250,247,244,0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(160,97,74,0.12);
}
.nav-logo {
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.2em;
  color: var(--soil);
  text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-size: 0.75rem; letter-spacing: 0.14em;
  color: var(--ash); text-decoration: none;
  transition: color 0.25s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--clay); }

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.hamburger span {
  display: block; width: 22px; height: 1.5px;
  background: var(--soil); transition: all 0.3s;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4.5px,4.5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4.5px,-4.5px); }

.mobile-menu {
  display: none; position: fixed; inset: 0; z-index: 99;
  background: var(--white);
  flex-direction: column; align-items: center; justify-content: center; gap: 2.5rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: var(--serif); font-size: 1.4rem;
  letter-spacing: 0.22em; color: var(--soil); text-decoration: none;
}

/* ── Page Header (各ページ上部) ── */
.page-header {
  padding: 9rem 2rem 4rem;
  background: var(--smoke);
  position: relative; overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 15% 60%, rgba(160,97,74,0.07) 0%, transparent 55%);
  pointer-events: none;
}
.page-header-inner { max-width: 900px; margin: 0 auto; }
.page-header-en {
  font-size: 0.65rem; letter-spacing: 0.38em;
  color: var(--clay); text-transform: uppercase; margin-bottom: 0.8rem;
  display: block;
}
.page-header-ja {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 400; letter-spacing: 0.12em;
  color: var(--soil); line-height: 1.3;
}

/* ── Section共通 ── */
section.content { padding: 5rem 2rem; }
.section-inner { max-width: 900px; margin: 0 auto; }
.section-label {
  display: block; font-size: 0.65rem;
  letter-spacing: 0.35em; color: var(--clay);
  text-transform: uppercase; margin-bottom: 0.8rem;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 400; letter-spacing: 0.1em;
  color: var(--soil); margin-bottom: 1.5rem;
}
.divider {
  width: 36px; height: 1px;
  background: var(--clay); margin-bottom: 2.2rem;
}

/* Reveal animation */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.75s cubic-bezier(0.22,1,0.36,1),
              transform 0.75s cubic-bezier(0.22,1,0.36,1);
}
.reveal.visible { opacity: 1; transform: none; }

/* ── Footer ── */
footer {
  background: var(--ink);
  padding: 3rem 2rem 2rem;
  text-align: center;
}
.footer-logo {
  font-family: var(--serif);
  font-size: 1.1rem; letter-spacing: 0.22em;
  color: var(--sand); margin-bottom: 1.5rem; display: block;
}
.footer-links {
  display: flex; justify-content: center; gap: 1.8rem;
  list-style: none; margin-bottom: 1.8rem; flex-wrap: wrap;
}
.footer-links a {
  font-size: 0.72rem; letter-spacing: 0.14em;
  color: var(--ash-lt); text-decoration: none;
  transition: color 0.25s;
}
.footer-links a:hover { color: var(--clay-lt); }
.footer-copy {
  font-size: 0.68rem; letter-spacing: 0.1em;
  color: rgba(232,221,208,0.3);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  nav { padding: 1rem 1.4rem; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  section.content { padding: 3.5rem 1.4rem; }
  .page-header { padding: 7.5rem 1.4rem 3rem; }
}