/* ============================================================
   浜名湖うなぎ 紹介サイト
   ============================================================ */

:root {
  /* Colors */
  --c-ink: #101c24;        /* 深い藍 */
  --c-ink-2: #1a2c38;      /* 藍（明） */
  --c-lake: #17394a;       /* 湖水 */
  --c-lake-light: #2b5a70;
  --c-gold: #c9a05a;       /* 金 */
  --c-gold-light: #e3c98f;
  --c-paper: #f7f3ea;      /* 和紙 */
  --c-paper-2: #efe8d8;
  --c-text: #2b2b28;
  --c-text-light: #5c5a52;
  --c-white: #fdfcf9;

  /* Typography */
  --font-serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;

  /* Layout */
  --container: 1080px;
  --header-h: 72px;
  --radius: 12px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.9;
  color: var(--c-text);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  line-height: 1.5;
  margin: 0 0 0.6em;
}

p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }

.container {
  width: min(100% - 3rem, var(--container));
  margin-inline: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.9em 2.2em;
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
              background-color 0.35s, color 0.35s, border-color 0.35s;
}
.btn:hover { transform: translateY(-3px); }
.btn-primary {
  background: var(--c-gold);
  color: var(--c-ink);
  box-shadow: 0 8px 24px rgba(201, 160, 90, 0.35);
}
.btn-primary:hover { background: var(--c-gold-light); }
.btn-ghost {
  border: 1px solid rgba(253, 252, 249, 0.5);
  color: var(--c-white);
}
.btn-ghost:hover { border-color: var(--c-gold); color: var(--c-gold); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  transition: background-color 0.4s, box-shadow 0.4s, backdrop-filter 0.4s;
}
.site-header.is-scrolled {
  background: rgba(16, 28, 36, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}
.header-inner {
  width: min(100% - 3rem, 1200px);
  margin-inline: auto;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--c-white);
}
.logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--c-gold);
  color: var(--c-ink);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
}
.logo-text {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
}
.site-nav ul {
  display: flex;
  gap: 2rem;
}
.site-nav a {
  color: rgba(253, 252, 249, 0.85);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}
.site-nav a:hover { color: var(--c-gold); border-color: var(--c-gold); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: transform 0.35s var(--ease), opacity 0.35s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--c-white);
  background:
    radial-gradient(120% 90% at 50% 0%, var(--c-lake-light) 0%, var(--c-lake) 42%, var(--c-ink) 100%);
  overflow: hidden;
  padding: calc(var(--header-h) + 2rem) 1.5rem 5rem;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-wave {
  position: absolute;
  left: 50%;
  width: 200%;
  aspect-ratio: 1 / 0.24;
  border-radius: 42%;
  opacity: 0.16;
  background: var(--c-gold-light);
  animation: wave 18s linear infinite;
}
.hero-wave--1 { bottom: -12%; transform: translateX(-50%); }
.hero-wave--2 {
  bottom: -16%;
  opacity: 0.1;
  background: #8fc1d4;
  animation-duration: 26s;
  animation-direction: reverse;
}
@keyframes wave {
  from { transform: translateX(-50%) rotate(0deg); }
  to   { transform: translateX(-50%) rotate(360deg); }
}

.hero-content { position: relative; max-width: 720px; }
.hero-kicker {
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--c-gold);
  margin-bottom: 1.2rem;
}
.hero-title { margin-bottom: 1.6rem; }
.hero-title-main {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.6rem, 8vw, 5rem);
  letter-spacing: 0.18em;
  text-shadow: 0 4px 32px rgba(0, 0, 0, 0.4);
}
.hero-title-main::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin: 1.2rem auto 0;
  background: var(--c-gold);
}
.hero-title-sub {
  display: block;
  margin-top: 1rem;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 0.9rem;
  letter-spacing: 0.5em;
  color: rgba(253, 252, 249, 0.7);
}
.hero-lead {
  font-size: 1.05rem;
  font-weight: 300;
  color: rgba(253, 252, 249, 0.9);
  margin-bottom: 2.4rem;
}
.hero-lead-line { display: block; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: rgba(253, 252, 249, 0.7);
}
.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--c-gold));
  animation: scrollLine 2s ease-in-out infinite;
  transform-origin: top;
}
@keyframes scrollLine {
  0%, 100% { transform: scaleY(0.4); opacity: 0.4; }
  50%      { transform: scaleY(1); opacity: 1; }
}
.hero-scroll-text { font-size: 0.65rem; letter-spacing: 0.35em; }

/* ---------- Sections ---------- */
.section { padding: 6rem 0; }
.section--dark {
  background: linear-gradient(180deg, var(--c-ink) 0%, var(--c-ink-2) 100%);
  color: var(--c-white);
}
.section--pattern {
  background-color: var(--c-paper-2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='28' viewBox='0 0 56 28'%3E%3Cg fill='none' stroke='%23c9a05a' stroke-opacity='0.14' stroke-width='1'%3E%3Cpath d='M0 28a14 14 0 0 1 28 0M28 28a14 14 0 0 1 28 0M-14 14a14 14 0 0 1 28 0M14 14a14 14 0 0 1 28 0M42 14a14 14 0 0 1 28 0M0 0a14 14 0 0 1 28 0M28 0a14 14 0 0 1 28 0'/%3E%3C/g%3E%3C/svg%3E");
}

.section-title {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-title-en {
  display: block;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin-bottom: 0.5rem;
}
.section-title-ja {
  display: block;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.12em;
}
.section-title-ja::after {
  content: "";
  display: block;
  width: 48px;
  height: 2px;
  margin: 1rem auto 0;
  background: var(--c-gold);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3.5rem;
  align-items: center;
  margin-bottom: 4.5rem;
}
.about-text .lead {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--c-text);
}
.about-text p { color: var(--c-text-light); }
.about-text strong { color: var(--c-text); border-bottom: 2px solid var(--c-gold-light); }

.about-visual { display: grid; place-items: center; }
.about-emblem {
  display: grid;
  place-items: center;
  width: min(260px, 60vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, var(--c-lake-light), var(--c-lake) 55%, var(--c-ink));
  box-shadow:
    0 24px 48px rgba(16, 28, 36, 0.25),
    inset 0 0 0 10px var(--c-paper),
    inset 0 0 0 12px var(--c-gold);
}
.about-emblem-char {
  font-family: var(--font-serif);
  font-size: 6rem;
  font-weight: 700;
  color: var(--c-gold-light);
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}
.feature-card {
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 2.2rem 1.8rem;
  text-align: center;
  box-shadow: 0 8px 24px rgba(16, 28, 36, 0.06);
  border-top: 3px solid var(--c-gold);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(16, 28, 36, 0.12);
}
.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--c-ink);
  color: var(--c-gold);
}
.feature-icon svg { width: 34px; height: 34px; }
.feature-card h3 { font-size: 1.15rem; letter-spacing: 0.06em; }
.feature-card p { margin: 0; font-size: 0.92rem; color: var(--c-text-light); }

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  max-width: 760px;
  margin-inline: auto;
  padding-left: 2rem;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-gold), rgba(201, 160, 90, 0.15));
}
.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.6rem;
  padding: 1.4rem 0 1.4rem 1.6rem;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-2rem - 6px);
  top: 2.1rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 3px solid var(--c-gold);
}
.timeline-year {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--c-gold);
  letter-spacing: 0.05em;
  padding-top: 0.15em;
}
.timeline-body h3 { font-size: 1.1rem; margin-bottom: 0.3em; }
.timeline-body p { margin: 0; font-size: 0.92rem; color: rgba(253, 252, 249, 0.75); }

/* ---------- Secret ---------- */
.secret-list {
  display: grid;
  gap: 2rem;
  max-width: 860px;
  margin-inline: auto;
}
.secret-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.8rem;
  align-items: start;
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 2.2rem;
  box-shadow: 0 8px 24px rgba(16, 28, 36, 0.06);
}
.secret-num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 2.4rem;
  color: var(--c-gold);
  line-height: 1;
  border-bottom: 3px solid var(--c-ink);
  padding-bottom: 0.4rem;
}
.secret-body h3 { font-size: 1.2rem; }
.secret-body p { margin: 0; color: var(--c-text-light); }

/* ---------- Menu ---------- */
.menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.8rem;
}
.menu-card {
  position: relative;
  background: var(--c-white);
  border-radius: var(--radius);
  padding: 2.4rem 2rem 2rem;
  box-shadow: 0 8px 24px rgba(16, 28, 36, 0.07);
  overflow: hidden;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.menu-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(16, 28, 36, 0.14);
}
.menu-card::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 160, 90, 0.16), transparent 70%);
}
.menu-card-tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--c-ink);
  background: var(--c-gold-light);
  border-radius: 999px;
  padding: 0.25em 1em;
  margin-bottom: 1rem;
}
.menu-card h3 { font-size: 1.3rem; letter-spacing: 0.05em; }
.menu-card p { margin: 0; font-size: 0.92rem; color: var(--c-text-light); }

/* ---------- Visit ---------- */
.visit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}
.visit-item {
  background: rgba(253, 252, 249, 0.05);
  border: 1px solid rgba(201, 160, 90, 0.25);
  border-radius: var(--radius);
  padding: 2rem 1.8rem;
}
.visit-item h3 {
  color: var(--c-gold);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(201, 160, 90, 0.35);
}
.visit-list li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.8rem;
  font-size: 0.9rem;
  color: rgba(253, 252, 249, 0.8);
}
.visit-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-gold);
}
.visit-list strong { color: var(--c-white); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-ink);
  color: rgba(253, 252, 249, 0.75);
  padding: 4rem 0 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(253, 252, 249, 0.12);
}
.footer-brand { max-width: 380px; }
.footer-brand .logo-mark { margin-bottom: 1rem; }
.footer-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.15em;
  color: var(--c-white);
  margin-bottom: 0.4rem;
}
.footer-desc { margin: 0; font-size: 0.85rem; }
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.footer-nav a {
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.3s;
}
.footer-nav a:hover { color: var(--c-gold); }
.footer-copy {
  margin: 0;
  padding: 1.4rem 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: rgba(253, 252, 249, 0.45);
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
.fade-in {
  opacity: 0;
  animation: fadeUp 1s var(--ease) forwards;
}
.hero .fade-in:nth-child(1) { animation-delay: 0.1s; }
.hero .fade-in:nth-child(2) { animation-delay: 0.3s; }
.hero .fade-in:nth-child(3) { animation-delay: 0.5s; }
.hero .fade-in:nth-child(4) { animation-delay: 0.7s; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-visual { order: -1; }
  .feature-cards { grid-template-columns: 1fr; }
  .visit-grid { grid-template-columns: 1fr; }
  .menu-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .hero-lead-line { display: inline; }

  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    background: rgba(16, 28, 36, 0.97);
    backdrop-filter: blur(10px);
    transform: translateY(-110%);
    visibility: hidden;
    transition: transform 0.4s var(--ease), visibility 0s 0.4s;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.3);
  }
  .site-nav.is-open {
    transform: none;
    visibility: visible;
    transition: transform 0.4s var(--ease), visibility 0s;
  }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0 1.5rem;
  }
  .site-nav a {
    display: block;
    padding: 0.9rem 1.5rem;
    border: none;
    border-bottom: 1px solid rgba(253, 252, 249, 0.08);
  }

  .section { padding: 4rem 0; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.3rem; }
  .secret-item { grid-template-columns: 1fr; gap: 1rem; padding: 1.8rem; }
  .secret-num { font-size: 1.8rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal, .fade-in { opacity: 1; transform: none; }
}