:root {
  /* テーマカラー */
  --enji: #6b0f1e;          /* 臙脂色：メイン */
  --enji-strong: #8a1527;   /* 臙脂色のホバー */
  --azuki: #96495e;         /* 小豆色：サブ */
  --azuki-light: #c98a9b;   /* 小豆色を暗い背景で文字に使うときの明るめ */

  /* ダーク背景 */
  --bg: #121012;
  --surface: #1b1719;
  --surface-2: #241f22;
  --line: #352d31;
  --text: #ece6e8;
  --text-muted: #a99fa4;

  --radius: 14px;
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "BIZ UDPGothic", "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--azuki-light); }

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  background: var(--enji);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--azuki);
  transition: background .2s, transform .2s;
}
.btn:hover { background: var(--enji-strong); transform: translateY(-1px); }
.btn--sm { padding: 8px 18px; font-size: 14px; }
.btn--lg { padding: 18px 36px; font-size: 18px; width: 100%; max-width: 420px; }

/* ---------- ヘッダー ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(18, 16, 18, .88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  font-family: "Yuji Syuku", serif;
  font-weight: 400;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .08em;
  color: var(--text);
  text-decoration: none;
}
.logo { color: var(--azuki-light); }
.logo span { color: #fff; }

/* ---------- セクション共通 ---------- */
.section { padding: 80px 0; }
.section--alt { background: var(--surface); }
.section__label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--azuki-light);
  margin-bottom: 8px;
}
.section__title {
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.4;
  margin: 0 0 32px;
}
.section__lead { color: var(--text-muted); margin: -16px 0 32px; }

/* ---------- ファーストビュー ---------- */
.hero {
  position: relative;
  padding: 72px 0 80px;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 85% 10%, rgba(107, 15, 30, .55), transparent 70%),
    radial-gradient(ellipse 60% 50% at 0% 100%, rgba(150, 73, 94, .25), transparent 70%),
    var(--bg);
}
.hero__badge {
  display: inline-block;
  padding: 4px 14px;
  border: 1px solid var(--azuki);
  border-radius: 999px;
  font-size: 13px;
  color: var(--azuki-light);
  margin-bottom: 20px;
}
.hero__title {
  font-size: clamp(36px, 10vw, 68px);
  line-height: 1.25;
  font-weight: 900;
  margin: 0 0 20px;
  letter-spacing: .02em;
}
.hero__title em { font-style: normal; color: var(--azuki-light); }
.hero__sub {
  font-size: clamp(15px, 3.6vw, 18px);
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 0 36px;
}
.offer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 18px 22px;
  margin-bottom: 28px;
  background: linear-gradient(90deg, var(--enji), #4a0a15);
  border: 1px solid var(--azuki);
  border-radius: var(--radius);
  max-width: 560px;
}
.offer__text { font-weight: 700; line-height: 1.5; }
.offer__text small { display: block; font-weight: 400; font-size: 13px; opacity: .85; }
.offer__seats {
  margin-left: auto;
  text-align: center;
  background: rgba(0, 0, 0, .3);
  border-radius: 10px;
  padding: 6px 14px;
  line-height: 1.3;
}
.offer__seats b { font-size: 28px; }
.offer__seats span { font-size: 12px; display: block; }

/* ---------- おすすめ ---------- */
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.checklist li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 20px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-weight: 500;
}
.checklist li::before {
  content: "";
  flex: 0 0 22px;
  height: 22px;
  margin-top: 3px;
  border-radius: 50%;
  background: var(--enji) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center / 13px no-repeat;
  border: 1px solid var(--azuki);
}

/* ---------- コンセプト ---------- */
.concept { display: grid; gap: 32px; align-items: center; }
.concept__text p { margin: 0 0 1em; }
.concept__text strong { color: var(--azuki-light); }

.placeholder {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  border: 1px dashed var(--azuki);
  background: repeating-linear-gradient(135deg, var(--surface-2) 0 12px, var(--surface) 12px 24px);
  display: grid;
  place-items: center;
  color: var(--text-muted);
  font-size: 14px;
}

/* ---------- スケジュール ---------- */
.schedule { display: grid; gap: 14px; }
.schedule__card {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  align-items: center;
  padding: 18px 20px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 4px solid var(--azuki);
  border-radius: var(--radius);
}
.schedule__card--meetup { border-left-color: var(--enji); background: linear-gradient(90deg, rgba(107, 15, 30, .35), var(--surface-2) 60%); }
.schedule__card { position: relative; }
.schedule__card--next {
  border-color: var(--azuki);
  border-left-color: #fff;
  background: linear-gradient(90deg, var(--enji), #3d0811 75%);
  box-shadow: 0 10px 30px rgba(107, 15, 30, .45);
}
.schedule__card--next .schedule__week { color: #fff; }
.schedule__card--next .schedule__meta { color: #f1dde2; }
.schedule__badge {
  position: absolute;
  top: -11px;
  right: 16px;
  padding: 2px 12px;
  border-radius: 999px;
  background: #fff;
  color: var(--enji);
  font-size: 12px;
  font-weight: 700;
}
.schedule__week { font-weight: 900; color: var(--azuki-light); font-size: 15px; }
.schedule__title { font-weight: 700; font-size: 17px; margin: 0; }
.schedule__meta { margin: 2px 0 0; font-size: 13px; color: var(--text-muted); }
.tag {
  display: inline-block;
  font-size: 12px;
  padding: 1px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  margin-left: 6px;
  color: var(--text);
}

/* ---------- できること ---------- */
.features { display: grid; gap: 16px; }
.feature {
  padding: 24px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.feature__num { font-size: 13px; font-weight: 900; color: var(--azuki-light); letter-spacing: .1em; }
.feature h3 { margin: 4px 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--text-muted); font-size: 15px; }

/* ---------- 主宰者 ---------- */
.profile { display: grid; gap: 24px; align-items: start; }
.profile .placeholder { aspect-ratio: 1; max-width: 240px; border-radius: 50%; }
.profile__name { font-size: 22px; font-weight: 700; margin: 0; }
.profile__role { color: var(--azuki-light); font-size: 14px; margin: 0 0 12px; }
.profile__text { color: var(--text-muted); }

/* ---------- 料金 ---------- */
.pricing { display: grid; gap: 16px; }
.plan {
  position: relative;
  padding: 26px 24px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.plan--featured {
  background: linear-gradient(160deg, var(--enji), #3d0811);
  border: 2px solid var(--azuki);
  box-shadow: 0 12px 40px rgba(107, 15, 30, .45);
}
.plan__ribbon {
  position: absolute;
  top: -13px;
  left: 20px;
  background: var(--azuki);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
}
.plan__name { font-weight: 700; margin: 0 0 6px; }
.plan__price { margin: 0; line-height: 1.2; }
.plan__price b { font-size: 40px; font-weight: 900; letter-spacing: .01em; }
.plan__price span { font-size: 15px; margin-left: 4px; }
.plan:not(.plan--featured) .plan__price b { font-size: 28px; text-decoration: line-through; text-decoration-color: var(--azuki); text-decoration-thickness: 2px; color: var(--text-muted); }
.plan__note { margin: 10px 0 0; font-size: 14px; color: var(--text-muted); }
.plan__tiers { list-style: none; padding: 0; margin: 16px 0 4px; display: grid; gap: 6px; }
.plan__tier {
  display: grid;
  grid-template-columns: 84px 1fr;
  align-items: baseline;
  gap: 0 8px;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(0, 0, 0, .25);
  font-size: 14px;
  color: #f1dde2;
}
.plan__tier b { font-size: 16px; white-space: nowrap; }
.plan__tier small { grid-column: 2; font-size: 12px; opacity: .8; }
.plan__tier.is-current { background: #fff; color: var(--enji); }
.plan__tier.is-current small { opacity: 1; }
.plan__tier.is-closed { opacity: .45; text-decoration: line-through; }
.plan--featured .plan__note { color: #f1dde2; }
.plan .btn { margin-top: 18px; background: #fff; color: var(--enji); border-color: #fff; width: 100%; }
.plan .btn:hover { background: #f3e6e9; }
.tax-note { font-size: 13px; color: var(--text-muted); margin-top: 16px; }

/* ---------- 紹介特典 ---------- */
.referral {
  margin-top: 32px;
  padding: 28px 24px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(107,15,30,.55), rgba(150,73,94,.25));
  border: 1px solid var(--azuki);
}
@media (min-width: 768px) { .referral { padding: 32px; } }

/* ---------- 単発参加 ---------- */
.trial {
  margin-top: 32px;
  padding: 28px 24px;
  border: 1px dashed var(--azuki);
  border-radius: var(--radius);
  background: var(--surface);
  display: grid;
  gap: 20px;
}
.trial__label { margin: 0; font-size: 13px; font-weight: 700; color: var(--azuki-light); letter-spacing: .05em; }
.trial__title { margin: 6px 0 10px; font-size: 20px; line-height: 1.5; }
.trial__price { margin: 0; line-height: 1.2; }
.trial__price b { font-size: 32px; font-weight: 900; }
.trial__price span { font-size: 14px; margin-left: 4px; }
.trial__list { margin: 14px 0 0; padding-left: 1.2em; font-size: 14px; color: var(--text-muted); }
.trial__list li + li { margin-top: 4px; }
.btn--ghost { background: transparent; border-color: var(--azuki); color: var(--text); }
.btn--ghost:hover { background: var(--surface-2); }
.btn.btn--disabled, .btn.btn--disabled:hover { background: var(--surface-2); border-color: var(--line); color: var(--text-muted); cursor: default; transform: none; pointer-events: none; }
@media (min-width: 768px) {
  .trial { grid-template-columns: 1fr auto; align-items: center; padding: 32px; }
}

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 12px; }
.faq details {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 20px;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 28px 18px 0;
  font-weight: 700;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "Q."; color: var(--azuki-light); margin-right: 8px; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: var(--azuki-light);
  transition: transform .2s;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { margin: 0 0 18px; color: var(--text-muted); }

/* ---------- 申込 ---------- */
.cta {
  text-align: center;
  padding: 88px 0;
  background:
    radial-gradient(ellipse 70% 80% at 50% 0%, rgba(107, 15, 30, .6), transparent 70%),
    var(--bg);
  border-top: 1px solid var(--line);
}
.cta h2 { font-size: clamp(26px, 6vw, 38px); margin: 0 0 12px; line-height: 1.4; }
.cta p { color: var(--text-muted); margin: 0 0 28px; }

/* ---------- フッター ---------- */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-muted);
}
.footer__links { list-style: none; padding: 0; margin: 0 0 16px; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer__links a { color: var(--text); text-decoration: none; }
.footer__links a:hover { color: var(--azuki-light); }
.footer p { margin: 4px 0; }

/* ---------- 法的ページ ---------- */
.legal { padding: 56px 0 80px; }
.legal h1 { font-size: clamp(24px, 5vw, 32px); margin: 0 0 8px; }
.legal .notice {
  padding: 12px 16px;
  border: 1px dashed var(--azuki);
  border-radius: 10px;
  color: var(--azuki-light);
  font-size: 14px;
  margin: 16px 0 32px;
}
.legal h2 { font-size: 18px; margin: 32px 0 8px; padding-left: 12px; border-left: 4px solid var(--enji); }
.legal table { width: 100%; border-collapse: collapse; }
.legal th, .legal td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.legal th { width: 34%; color: var(--text-muted); font-weight: 500; }

/* ---------- PC ---------- */
@media (min-width: 768px) {
  .section { padding: 112px 0; }
  .hero { padding: 120px 0 128px; }
  .concept { grid-template-columns: 1.1fr 1fr; gap: 56px; }
  .checklist { grid-template-columns: repeat(3, 1fr); }
  .schedule { grid-template-columns: repeat(2, 1fr); }
  .schedule__card { grid-template-columns: 1fr; text-align: left; align-content: start; border-left-width: 1px; border-top: 4px solid var(--azuki); }
  .schedule__card--next { border-top-color: #fff; background: linear-gradient(180deg, var(--enji), #3d0811 80%); }
  .features { grid-template-columns: repeat(3, 1fr); }
  .profile { grid-template-columns: 240px 1fr; gap: 48px; }
  .pricing { grid-template-columns: 1.3fr 1fr 1fr; align-items: center; }
  .legal th { width: 28%; }
}

@media (min-width: 960px) {
  .schedule { grid-template-columns: repeat(5, 1fr); }
}

/* ---------- 入会特典（ボタンを押すと出る） ---------- */
.perk__open {
  display: block;
  width: 100%;
  margin-top: 18px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px dashed #f1dde2;
  background: transparent;
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.perk__open:hover { background: rgba(255, 255, 255, .08); }
.perk__open[hidden] { display: none; }
.perk {
  margin-top: 18px;
  padding: 18px;
  border-radius: 12px;
  background: rgba(0, 0, 0, .3);
  border: 1px solid var(--azuki);
  animation: perk-in .35s ease;
}
.perk[hidden] { display: none; }
.perk__who { margin: 0 0 6px; color: #f1dde2; }
.perk__who b { font-size: 22px; color: #fff; }
.perk__main { margin: 0; font-size: 18px; font-weight: 700; }
.perk__main b { font-size: 28px; color: #fff; white-space: nowrap; }
.perk__sub { margin: 6px 0 0; font-size: 14px; color: #f1dde2; }
.perk__note { margin: 12px 0 0; font-size: 12px; color: #f1dde2; opacity: .85; }
.plan__alt { margin: 12px 4px 0; font-size: 13px; color: var(--text-muted); }
@keyframes perk-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (min-width: 768px) {
  .pricing { grid-template-columns: minmax(0, 560px); justify-content: center; }
}

/* ---------- 掟 ---------- */
.rules { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.rules li {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 20px 22px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 4px solid var(--enji);
  border-radius: var(--radius);
}
.rules__num {
  flex: 0 0 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--enji);
  border: 1px solid var(--azuki);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  font-family: "BIZ UDPGothic", sans-serif;
}
.rules li p { margin: 0; font-size: 17px; font-weight: 700; line-height: 1.6; }
.rules__warn { margin: 16px 0 0; font-size: 14px; color: var(--text-muted); padding-left: 1em; text-indent: -1em; }
.rules__warn::before { content: "※"; }
.rules__together {
  margin-top: 28px;
  padding: 22px 24px;
  border: 1px dashed var(--azuki);
  border-radius: var(--radius);
}
.rules__together p { margin: 0; color: var(--text-muted); font-size: 15px; }
.rules__together .rules__together-title { color: var(--azuki-light); font-weight: 700; font-size: 16px; margin-bottom: 6px; }
@media (min-width: 768px) {
  .rules { grid-template-columns: repeat(3, 1fr); }
  .rules li { flex-direction: column; text-align: center; border-left-width: 1px; border-top: 4px solid var(--enji); padding: 28px 22px; }
}