/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-feature-settings: "palt";
  color: #111827;
  background: #FAFAF7;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

:root {
  --accent: #2DD4BF;
  --accent-deep: #0F9488;
  --ink: #111827;
  --ink-soft: #4B5563;
  --bg: #FAFAF7;
  --bg-card: #FFFFFF;
  --line: #E5E7EB;
  --pop: #F43F5E;
  --max: 1080px;
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ===== Nav ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.6);
}
.nav__inner {
  max-width: var(--max); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__logo { font-weight: 800; font-size: 15px; letter-spacing: 0.02em; }
.nav__badge {
  font-family: 'Inter', sans-serif;
  font-size: 12px; font-weight: 700;
  color: var(--accent-deep);
  background: rgba(45, 212, 191, 0.12);
  padding: 6px 12px; border-radius: 999px;
  letter-spacing: 0.06em;
}

/* ===== Hero ===== */
.hero {
  padding: 140px 24px 80px;
  background:
    radial-gradient(60% 60% at 80% 20%, rgba(45, 212, 191, 0.18), transparent 70%),
    radial-gradient(50% 50% at 10% 90%, rgba(244, 63, 94, 0.10), transparent 70%),
    linear-gradient(180deg, #FFFFFF 0%, #FAFAF7 100%);
}
.hero__inner { max-width: var(--max); margin: 0 auto; }
.hero__eyebrow {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 12px; font-weight: 700; letter-spacing: 0.22em;
  color: var(--accent-deep);
  background: rgba(45, 212, 191, 0.12);
  padding: 6px 14px; border-radius: 999px;
  margin-bottom: 28px;
}
.hero__title {
  font-size: clamp(40px, 7vw, 76px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-bottom: 28px;
}
.hero__title-accent {
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__sub {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--ink-soft);
  margin-bottom: 32px;
  line-height: 1.95;
}
.hero__notice {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 14px; color: var(--ink-soft);
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  padding: 10px 16px; border-radius: 12px;
}
.hero__notice-tag {
  display: inline-block;
  font-size: 11px; font-weight: 800;
  letter-spacing: 0.06em;
  background: #F43F5E; color: #fff;
  padding: 3px 10px; border-radius: 999px;
}

/* ===== Section base ===== */
.section { padding: 90px 0; }
.section__label {
  font-family: 'Inter', sans-serif;
  font-size: 12px; font-weight: 700; letter-spacing: 0.24em;
  color: var(--accent-deep); margin-bottom: 14px;
}
.section__title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900; line-height: 1.4;
  margin-bottom: 14px;
  letter-spacing: -0.005em;
}
.section__lead {
  font-size: 16px; color: var(--ink-soft);
  line-height: 1.95; margin-bottom: 44px;
  max-width: 680px;
}

/* ===== Date axis ===== */
.section--date { background: var(--bg); }
.date-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(4, 1fr);
}
.date-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 24px 24px;
  display: flex; flex-direction: column;
  position: relative;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  min-height: 220px;
}
.date-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}
.date-card--main { background: linear-gradient(135deg, #FFFFFF 0%, #F0FDFA 100%); }
.date-card__day {
  font-family: 'Inter', sans-serif;
  font-size: 36px; font-weight: 900;
  color: var(--accent-deep);
  line-height: 1;
  margin-bottom: 4px;
}
.date-card__weekday {
  font-family: 'Inter', sans-serif;
  font-size: 13px; font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}
.date-card__title {
  font-size: 18px; font-weight: 800;
  line-height: 1.45;
  margin-bottom: 12px;
  color: var(--ink);
}
.date-card__title small {
  display: block;
  font-size: 13px; font-weight: 700;
  color: var(--ink-soft);
  margin-top: 4px;
}
.date-card__desc {
  font-size: 13px; color: var(--ink-soft);
  line-height: 1.75;
  flex-grow: 1;
}
.date-card__arrow {
  margin-top: 16px;
  font-size: 20px; font-weight: 800;
  color: var(--accent);
  transition: transform .2s ease;
}
.date-card:hover .date-card__arrow { transform: translateX(4px); }

@media (max-width: 900px) { .date-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .date-grid { grid-template-columns: 1fr; } .date-card { min-height: auto; } }

/* ===== Theme axis ===== */
.section--theme {
  background: linear-gradient(180deg, #FAFAF7 0%, #F0FDFA 100%);
}
.theme-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(2, 1fr);
}
.theme-group {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 28px 12px;
}
.theme-group__title {
  font-size: 18px; font-weight: 800;
  color: var(--ink);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}
.theme-list { display: flex; flex-direction: column; }
.theme-list li {
  border-bottom: 1px solid var(--line);
}
.theme-list li:last-child { border-bottom: none; }
.theme-list a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 2px;
  font-size: 15px; font-weight: 600;
  color: var(--ink);
  transition: color .2s ease, padding .2s ease;
}
.theme-list a::after {
  content: "→";
  color: var(--accent);
  font-weight: 800;
  transition: transform .2s ease;
}
.theme-list a:hover { color: var(--accent-deep); padding-left: 6px; }
.theme-list a:hover::after { transform: translateX(4px); }

@media (max-width: 720px) { .theme-grid { grid-template-columns: 1fr; } }

/* ===== About ===== */
.section--about {
  background: var(--bg);
  padding: 80px 0 100px;
}
.about-card {
  background: linear-gradient(135deg, #111827 0%, #0F9488 100%);
  color: #fff;
  border-radius: 28px;
  padding: 56px 48px;
  box-shadow: 0 24px 60px rgba(15, 148, 136, 0.22);
}
.about-card__label {
  font-family: 'Inter', sans-serif;
  font-size: 12px; font-weight: 700; letter-spacing: 0.24em;
  opacity: 0.7; margin-bottom: 14px;
}
.about-card__title {
  font-size: clamp(24px, 3.5vw, 34px);
  font-weight: 900; line-height: 1.4;
  margin-bottom: 22px;
}
.about-card__body {
  font-size: 16px; line-height: 1.95;
  opacity: 0.94;
  margin-bottom: 16px;
}
.about-card__body strong { color: #99F6E4; font-weight: 700; }
.about-card__links { margin-top: 28px; }
.about-card__link {
  display: inline-flex; align-items: center;
  font-size: 15px; font-weight: 700;
  color: #fff;
  border-bottom: 2px solid #99F6E4;
  padding-bottom: 4px;
  transition: opacity .2s ease, transform .2s ease;
}
.about-card__link:hover { opacity: 0.85; transform: translateX(4px); }

/* ===== Footer ===== */
.footer {
  background: var(--ink); color: #9CA3AF;
  padding: 32px 0;
}
.footer__inner { text-align: center; font-size: 13px; }

/* ===== Sub-page common ===== */
.subpage {
  padding: 110px 0 80px;
  min-height: 80vh;
}
.subpage__back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600;
  color: var(--accent-deep);
  margin-bottom: 24px;
  transition: transform .2s ease;
}
.subpage__back:hover { transform: translateX(-4px); }
.subpage__eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 12px; font-weight: 700; letter-spacing: 0.22em;
  color: var(--accent-deep);
  margin-bottom: 14px;
}
.subpage__title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 20px;
}
.subpage__lead {
  font-size: 16px; color: var(--ink-soft);
  line-height: 1.95;
  margin-bottom: 40px;
  max-width: 720px;
}
.placeholder-card {
  background: #FFFBEB;
  border: 1px dashed #FDE68A;
  border-radius: 20px;
  padding: 36px 32px;
  margin-bottom: 32px;
}
.placeholder-card h3 {
  font-size: 18px; font-weight: 800;
  margin-bottom: 12px;
}
.placeholder-card p {
  font-size: 14px; color: var(--ink-soft);
  line-height: 1.85;
  margin-bottom: 10px;
}
.placeholder-card ul {
  margin: 12px 0 0 20px;
  list-style: disc;
}
.placeholder-card li {
  font-size: 14px; color: var(--ink-soft);
  line-height: 1.85;
  margin-bottom: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero { padding: 110px 24px 60px; }
  .section { padding: 60px 0; }
  .about-card { padding: 40px 28px; }
  .theme-group { padding: 24px 22px 10px; }
}