:root {
  --ink: #1c1712;
  --ink-soft: #4a3f33;
  --paper: #faf6ef;
  --paper-deep: #f2ead9;
  --gold: #b8894a;
  --gold-deep: #8f6329;
  --lake: #2e5d6b;
  --lake-deep: #1d3f4a;
  --white: #ffffff;
  --shadow: 0 12px 40px rgba(28, 23, 18, 0.12);
  --radius: 18px;
  --serif: "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

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

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

.pc { display: inline; }
.sp { display: none; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 246, 239, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(28, 23, 18, 0.08);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: var(--white);
  font-size: 1.05rem;
  box-shadow: 0 4px 12px rgba(143, 99, 41, 0.35);
}

.site-nav {
  display: flex;
  gap: 26px;
  font-size: 0.9rem;
  font-weight: 500;
}

.site-nav a {
  position: relative;
  padding: 6px 0;
  color: var(--ink-soft);
  transition: color 0.2s;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: width 0.25s;
}

.site-nav a:hover {
  color: var(--ink);
}

.site-nav a:hover::after {
  width: 100%;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(184, 137, 74, 0.18), transparent 55%),
    radial-gradient(ellipse at 85% 85%, rgba(46, 93, 107, 0.22), transparent 55%),
    linear-gradient(180deg, #f7f1e4 0%, var(--paper) 60%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-wave {
  position: absolute;
  left: -10%;
  right: -10%;
  height: 180px;
  border-radius: 50%;
  opacity: 0.5;
}

.wave-1 {
  bottom: 40px;
  background: radial-gradient(ellipse at center, rgba(46, 93, 107, 0.16), transparent 70%);
}

.wave-2 {
  bottom: -20px;
  background: radial-gradient(ellipse at center, rgba(184, 137, 74, 0.16), transparent 70%);
}

.hero-inner {
  position: relative;
  max-width: 860px;
}

.hero-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.35em;
  color: var(--gold-deep);
  font-weight: 700;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--serif);
  margin-bottom: 28px;
}

.hero-title-main {
  display: block;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.25;
  background: linear-gradient(120deg, #2b2118 20%, #6d4a1f 60%, #2b2118 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-title-sub {
  display: block;
  margin-top: 18px;
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.14em;
}

.hero-lead {
  font-size: clamp(0.92rem, 1.8vw, 1.05rem);
  color: var(--ink-soft);
  margin-bottom: 40px;
}

.hero-cta {
  display: inline-block;
  padding: 15px 44px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: var(--white);
  font-weight: 700;
  letter-spacing: 0.12em;
  box-shadow: 0 10px 28px rgba(143, 99, 41, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}

.hero-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(143, 99, 41, 0.45);
}

.hero-scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 54px;
  background: rgba(28, 23, 18, 0.15);
  overflow: hidden;
}

.hero-scroll span {
  position: absolute;
  top: -20px;
  left: 0;
  width: 100%;
  height: 20px;
  background: var(--gold-deep);
  animation: scroll-down 1.8s ease-in-out infinite;
}

@keyframes scroll-down {
  0% { top: -20px; }
  70% { top: 60px; }
  100% { top: 60px; }
}

/* ---------- Sections ---------- */
.section {
  padding: 96px 24px;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.section-kicker {
  font-size: 0.78rem;
  letter-spacing: 0.35em;
  font-weight: 700;
  color: var(--gold-deep);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 52px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -14px;
  width: 56px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.about-text p {
  margin-bottom: 1.4em;
  color: var(--ink-soft);
  text-align: justify;
}

.lake-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 30px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(184, 137, 74, 0.18);
}

.lake-circle {
  width: 168px;
  height: 168px;
  margin: 0 auto 28px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: radial-gradient(circle at 35% 30%, #4d7f8e, var(--lake) 55%, var(--lake-deep));
  color: var(--white);
  box-shadow: inset 0 0 0 8px rgba(255, 255, 255, 0.12), 0 14px 30px rgba(29, 63, 74, 0.35);
}

.lake-label {
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  opacity: 0.85;
}

.lake-name {
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.lake-note {
  font-size: 0.78rem;
  opacity: 0.85;
}

.lake-facts {
  list-style: none;
}

.lake-facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 4px;
  border-top: 1px dashed rgba(28, 23, 18, 0.15);
}

.fact-num {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--gold-deep);
  white-space: nowrap;
}

.fact-label {
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-align: right;
}

/* ---------- History ---------- */
.history {
  background: var(--paper-deep);
}

.timeline {
  position: relative;
  padding-left: 8px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 96px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(184, 137, 74, 0.15));
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 40px;
  padding: 26px 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 91px;
  top: 40px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(184, 137, 74, 0.2);
}

.timeline-year {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--gold-deep);
  text-align: right;
  padding-top: 8px;
  letter-spacing: 0.05em;
}

.timeline-body {
  padding-left: 28px;
}

.timeline-body h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 0.06em;
}

.timeline-body p {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* ---------- Quality ---------- */
.quality-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.quality-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 34px 30px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(184, 137, 74, 0.14);
  transition: transform 0.25s, box-shadow 0.25s;
}

.quality-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(28, 23, 18, 0.16);
}

.quality-icon {
  color: var(--gold-deep);
  margin-bottom: 18px;
}

.quality-card h3 {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.quality-card p {
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* ---------- Enjoy ---------- */
.enjoy {
  background: var(--paper-deep);
}

.enjoy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 44px;
}

.enjoy-card {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 26px 26px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--gold);
}

.enjoy-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold-deep);
  background: rgba(184, 137, 74, 0.14);
  border: 1px solid rgba(184, 137, 74, 0.35);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 14px;
}

.enjoy-card h3 {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

.enjoy-card p {
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.enjoy-note {
  background: linear-gradient(135deg, var(--lake), var(--lake-deep));
  color: var(--white);
  border-radius: var(--radius);
  padding: 34px 36px;
  text-align: center;
  box-shadow: 0 16px 40px rgba(29, 63, 74, 0.3);
}

.enjoy-note p {
  font-size: 0.95rem;
  line-height: 2;
}

.enjoy-note strong {
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
}

/* ---------- Area ---------- */
.area-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.area-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(46, 93, 107, 0.15);
}

.area-card h3 {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
  color: var(--lake-deep);
}

.area-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.access-box {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 34px;
  box-shadow: var(--shadow);
  border-left: 5px solid var(--lake);
}

.access-box h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  color: var(--lake-deep);
}

.access-box ul {
  list-style: none;
}

.access-box li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.access-label {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--white);
  background: var(--lake);
  border-radius: 6px;
  padding: 3px 10px;
}

/* ---------- CTA ---------- */
.cta {
  background:
    radial-gradient(ellipse at 15% 20%, rgba(184, 137, 74, 0.25), transparent 55%),
    radial-gradient(ellipse at 85% 80%, rgba(46, 93, 107, 0.3), transparent 55%),
    linear-gradient(160deg, #241c14, #171310);
  color: var(--white);
  text-align: center;
  padding: 110px 24px;
}

.cta-title {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  margin-bottom: 22px;
}

.cta-text {
  font-size: 0.98rem;
  color: rgba(250, 246, 239, 0.85);
  line-height: 2.1;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #14100c;
  color: rgba(250, 246, 239, 0.75);
  padding: 44px 24px 36px;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--paper);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 26px;
  font-size: 0.85rem;
}

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

.copyright {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(250, 246, 239, 0.45);
}

.site-note {
  max-width: 640px;
  text-align: center;
  font-size: 0.75rem;
  line-height: 1.9;
  color: rgba(250, 246, 239, 0.55);
  border-top: 1px solid rgba(250, 246, 239, 0.12);
  padding-top: 18px;
}

.site-note strong {
  color: var(--gold);
  font-weight: 700;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .quality-grid {
    grid-template-columns: 1fr;
  }

  .enjoy-grid,
  .area-grid {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 12px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding-left: 44px;
  }

  .timeline-item::before {
    left: 7px;
    top: 34px;
  }

  .timeline-year {
    text-align: left;
    padding-top: 0;
  }

  .timeline-body {
    padding-left: 0;
  }
}

@media (max-width: 720px) {
  .site-nav {
    display: none;
  }

  .pc { display: none; }
  .sp { display: inline; }

  .section {
    padding: 72px 20px;
  }

  .hero {
    padding: 110px 20px 70px;
  }
}