/* ============================================================
   AIFC（AI制度対策委員会）デザインシステム
   紺×金×生成りの、士業向けプレミアムトーン
   ============================================================ */

:root {
  --navy-900: #0a1428;
  --navy-800: #101e38;
  --navy-700: #16294b;
  --navy-600: #1e3a63;
  --gold: #b3924f;
  --gold-strong: #9a7b3c;
  --gold-pale: #e9d9b4;
  --ink: #232a3b;
  --muted: #626b7d;
  --line: #e4e0d6;
  --paper: #f9f8f4;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(10, 20, 40, 0.08);
  --shadow-soft: 0 4px 14px rgba(10, 20, 40, 0.06);
  --font-serif: "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --font-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(--font-sans);
  color: var(--ink);
  background: var(--white);
  line-height: 1.9;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}

h1, h2, h3, h4, .brand-mark, .plan-price {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.5;
  color: var(--navy-900);
}

img { max-width: 100%; display: block; }
a { color: var(--navy-700); text-decoration: none; }
p + p { margin-top: 0.8em; }
sup.reg { font-size: 0.55em; vertical-align: super; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- ヘッダー ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.25s ease;
}
.site-header.is-scrolled { box-shadow: var(--shadow-soft); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 16px; }
.brand { display: flex; align-items: baseline; gap: 10px; white-space: nowrap; }
.brand-mark { font-size: 26px; letter-spacing: 0.08em; color: var(--navy-900); }
.brand-name { font-size: 12px; color: var(--muted); letter-spacing: 0.14em; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav > a { font-size: 13.5px; font-weight: 500; color: var(--ink); letter-spacing: 0.04em; padding: 6px 0; border-bottom: 2px solid transparent; transition: color 0.2s, border-color 0.2s; }
.site-nav > a:hover { color: var(--gold-strong); }
.site-nav > a[aria-current="page"] { color: var(--navy-900); border-bottom-color: var(--gold); }
.btn--nav { padding: 10px 20px; font-size: 13.5px; border-bottom: none !important; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; width: 44px; height: 44px; position: relative; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy-900); margin: 5px auto; transition: transform 0.25s, opacity 0.25s; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- ボタン ---------- */
.btn {
  display: inline-block; padding: 14px 34px; border-radius: 6px;
  font-weight: 700; font-size: 15px; letter-spacing: 0.06em;
  transition: opacity 0.2s, transform 0.2s, background 0.2s, color 0.2s;
  text-align: center; border: 1px solid transparent; cursor: pointer;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); }
.btn--gold { background: linear-gradient(135deg, var(--gold) 0%, var(--gold-strong) 100%); color: #fff; }
.btn--navy { background: var(--navy-800); color: #fff; }
.btn--outline { border-color: var(--navy-700); color: var(--navy-700); background: transparent; }
.btn--outline:hover { background: var(--navy-700); color: #fff; }
.btn--outline-light { border-color: rgba(255, 255, 255, 0.6); color: #fff; background: transparent; }
.btn--outline-light:hover { background: rgba(255, 255, 255, 0.12); }

/* ---------- ヒーロー（トップ） ---------- */
.hero {
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(179, 146, 79, 0.22), transparent 60%),
    radial-gradient(700px 400px at -10% 110%, rgba(30, 58, 99, 0.55), transparent 60%),
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 60%, var(--navy-700) 100%);
  color: #fff; padding: 110px 0 90px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 56px 56px; pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero .eyebrow { color: var(--gold-pale); }
.hero h1 { color: #fff; font-size: clamp(30px, 4.6vw, 52px); line-height: 1.45; margin: 18px 0 22px; letter-spacing: 0.04em; }
.hero .lead { font-size: clamp(15px, 1.6vw, 18px); color: rgba(255, 255, 255, 0.85); max-width: 720px; }
.hero-actions { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.hero-chips { display: flex; gap: 12px; margin-top: 44px; flex-wrap: wrap; }
.hero-chip {
  border: 1px solid rgba(233, 217, 180, 0.4); border-radius: 999px;
  padding: 8px 18px; font-size: 13px; color: var(--gold-pale); letter-spacing: 0.04em;
  background: rgba(10, 20, 40, 0.35);
}

/* ---------- サブページヒーロー ---------- */
.page-hero {
  background:
    radial-gradient(800px 400px at 90% -20%, rgba(179, 146, 79, 0.2), transparent 60%),
    linear-gradient(150deg, var(--navy-900) 0%, var(--navy-800) 70%, var(--navy-700) 100%);
  color: #fff; padding: 72px 0 56px;
}
.page-hero .eyebrow { color: var(--gold-pale); }
.page-hero h1 { color: #fff; font-size: clamp(28px, 3.6vw, 42px); margin: 12px 0 16px; letter-spacing: 0.05em; }
.page-hero .lead { color: rgba(255, 255, 255, 0.85); max-width: 780px; font-size: 15.5px; }

/* ---------- セクション ---------- */
.section { padding: 88px 0; }
.section--alt { background: var(--paper); }
.section--dark { background: linear-gradient(160deg, var(--navy-900), var(--navy-800)); color: rgba(255, 255, 255, 0.9); }
.section--dark h2, .section--dark h3 { color: #fff; }
.section--dark .section-lead { color: rgba(255, 255, 255, 0.78); }
.section--dark .note { color: rgba(255, 255, 255, 0.68); }
.section--dark .note a { color: var(--gold-pale); text-decoration: underline; }
.section--dark .card h3 { color: var(--navy-900); }
.section--dark .card .feature-list li { color: var(--ink); }
.section--dark .card .note { color: var(--muted); }
.section--dark .card .note a { color: var(--navy-700); text-decoration: none; }

.eyebrow {
  font-size: 12.5px; font-weight: 700; letter-spacing: 0.28em;
  text-transform: uppercase; color: var(--gold-strong);
}
.eyebrow .keep-case { text-transform: none; }
.section-head { margin-bottom: 48px; max-width: 820px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(24px, 3vw, 34px); margin: 10px 0 14px; letter-spacing: 0.05em; }
.section-lead { color: var(--muted); font-size: 15.5px; }

/* ---------- グリッド・カード ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 30px; box-shadow: var(--shadow-soft);
}
.card h3 { font-size: 19px; margin-bottom: 12px; letter-spacing: 0.04em; }
.card p { font-size: 14.5px; color: var(--muted); }
.card-num { font-family: var(--font-serif); font-size: 15px; color: var(--gold); letter-spacing: 0.2em; display: block; margin-bottom: 14px; }

.pillar-card {
  display: block; background: var(--white); border: 1px solid var(--line);
  border-top: 3px solid var(--gold); border-radius: var(--radius);
  padding: 36px 30px; box-shadow: var(--shadow-soft);
  transition: transform 0.25s, box-shadow 0.25s;
}
.pillar-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.pillar-card h3 { font-size: 20px; margin-bottom: 12px; }
.pillar-card p { font-size: 14.5px; color: var(--muted); }
.pillar-card .pillar-more { display: inline-block; margin-top: 18px; font-size: 13.5px; font-weight: 700; color: var(--gold-strong); letter-spacing: 0.08em; }

.feature-list { list-style: none; }
.feature-list li {
  position: relative; padding-left: 26px; margin-bottom: 10px; font-size: 14.5px;
}
.feature-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--gold); font-weight: 700;
}
.section--dark .feature-list li { color: rgba(255, 255, 255, 0.85); }

/* ---------- テーブル ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); box-shadow: var(--shadow-soft); border: 1px solid var(--line); }
table.table { width: 100%; border-collapse: collapse; background: #fff; font-size: 14.5px; min-width: 640px; }
.table thead th {
  background: var(--navy-800); color: #fff; font-weight: 600; text-align: left;
  padding: 16px 18px; letter-spacing: 0.06em; font-size: 14px; white-space: nowrap;
}
.table tbody th { background: var(--paper); font-weight: 600; text-align: left; padding: 14px 18px; white-space: nowrap; color: var(--navy-800); }
.table td { padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table tbody tr:last-child td { border-bottom: none; }
.table td.center, .table th.center { text-align: center; }
.table .price-strong { font-family: var(--font-serif); font-size: 17px; color: var(--navy-900); font-weight: 700; white-space: nowrap; }
.table-note { font-size: 12.5px; color: var(--muted); margin-top: 12px; }

/* ---------- 料金プランカード ---------- */
.plan-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 38px 32px; box-shadow: var(--shadow-soft); position: relative;
  display: flex; flex-direction: column;
}
.plan-card--featured { border: 2px solid var(--gold); box-shadow: var(--shadow); }
.plan-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--gold), var(--gold-strong)); color: #fff;
  font-size: 12px; font-weight: 700; letter-spacing: 0.14em; padding: 5px 18px; border-radius: 999px; white-space: nowrap;
}
.plan-name { font-family: var(--font-serif); font-size: 24px; color: var(--navy-900); letter-spacing: 0.1em; }
.plan-target { font-size: 12.5px; color: var(--muted); margin-top: 4px; min-height: 2.6em; }
.plan-price { font-size: 15px; color: var(--muted); margin: 18px 0 6px; }
.plan-price strong { font-size: 34px; color: var(--navy-900); letter-spacing: 0.02em; font-weight: 700; }
.plan-price span { font-size: 13px; color: var(--muted); }
.plan-divider { border: none; border-top: 1px solid var(--line); margin: 20px 0; }
.plan-card .feature-list { flex: 1; }
.plan-card .btn { margin-top: 24px; }

/* ---------- ラベル・注記 ---------- */
.badge {
  display: inline-block; background: rgba(179, 146, 79, 0.12); color: var(--gold-strong);
  border: 1px solid rgba(179, 146, 79, 0.35); font-size: 12px; font-weight: 700;
  padding: 3px 12px; border-radius: 999px; letter-spacing: 0.08em;
}
.badge--dark { background: var(--navy-800); color: var(--gold-pale); border-color: var(--navy-700); }
.note { font-size: 12.5px; color: var(--muted); }
.notice-box {
  border: 1px solid var(--gold); background: rgba(179, 146, 79, 0.07);
  border-radius: var(--radius); padding: 22px 26px; font-size: 14px;
}
.notice-box h4 { margin-bottom: 8px; font-size: 15.5px; }

/* ---------- ユーティリティ ---------- */
.u-center { text-align: center; }
.u-mt-20 { margin-top: 20px; }
.u-mt-36 { margin-top: 36px; }

/* ---------- ステップ ---------- */
.steps { list-style: none; counter-reset: step; display: grid; gap: 22px; }
.steps li {
  counter-increment: step; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 28px 26px 84px; position: relative; box-shadow: var(--shadow-soft);
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 26px; top: 24px;
  font-family: var(--font-serif); font-size: 26px; color: var(--gold); font-weight: 600;
}
.steps h4 { font-size: 16.5px; margin-bottom: 6px; }
.steps p { font-size: 14px; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 14px; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-soft); overflow: hidden;
}
.faq-item summary {
  cursor: pointer; list-style: none; padding: 20px 56px 20px 24px;
  font-weight: 700; font-size: 15px; color: var(--navy-900); position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "Q."; color: var(--gold-strong); font-family: var(--font-serif); margin-right: 10px; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font-size: 22px; color: var(--gold); transition: transform 0.2s;
}
.faq-item[open] summary::after { content: "−"; }
.faq-a { padding: 0 24px 22px; font-size: 14.5px; color: var(--muted); border-top: 1px dashed var(--line); }
.faq-a p { padding-top: 16px; }

/* ---------- CTAバンド ---------- */
.cta-band {
  background:
    radial-gradient(800px 400px at 15% -30%, rgba(179, 146, 79, 0.25), transparent 60%),
    linear-gradient(150deg, var(--navy-900), var(--navy-800));
  color: #fff; padding: 78px 0; text-align: center;
}
.cta-inner h2 { color: #fff; font-size: clamp(22px, 3vw, 32px); margin-bottom: 14px; letter-spacing: 0.06em; }
.cta-inner p { color: rgba(255, 255, 255, 0.82); max-width: 640px; margin: 0 auto; font-size: 15px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }

/* ---------- フッター ---------- */
.site-footer { background: var(--navy-900); color: rgba(255, 255, 255, 0.75); font-size: 13.5px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding: 60px 24px 44px; }
.footer-brand { font-family: var(--font-serif); font-size: 22px; color: #fff; letter-spacing: 0.1em; margin-bottom: 12px; }
.footer-brand span { font-size: 12px; color: rgba(255, 255, 255, 0.6); margin-left: 10px; letter-spacing: 0.14em; }
.footer-about p { font-size: 13px; line-height: 1.9; }
.footer-nav { display: grid; gap: 8px; align-content: start; }
.footer-nav a { color: rgba(255, 255, 255, 0.75); font-size: 13px; transition: color 0.2s; }
.footer-nav a:hover { color: var(--gold-pale); }
.footer-company-name { font-weight: 700; color: #fff; margin-bottom: 4px; }
.footer-company a { color: rgba(255, 255, 255, 0.75); font-size: 13px; text-decoration: underline; }
.footer-company a:hover { color: var(--gold-pale); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.12); padding: 18px 0; }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 12px; color: rgba(255, 255, 255, 0.55); }

/* ---------- 予約カレンダー埋め込み ---------- */
.booking-embed {
  width: 100%; height: 680px; border: 1px solid var(--line);
  border-radius: var(--radius); background: #fff; display: block;
}

/* ---------- 法的文書 ---------- */
.legal-doc { max-width: 860px; margin: 0 auto; font-size: 14.5px; }
.legal-doc h2 { font-size: 19px; margin: 44px 0 14px; letter-spacing: 0.04em; }
.legal-doc h2:first-child { margin-top: 0; }
.legal-doc h3 { font-size: 16px; margin: 28px 0 10px; }
.legal-doc p { margin-bottom: 0.9em; }
.legal-doc ol, .legal-doc ul { margin: 0 0 1.1em 1.6em; }
.legal-doc ol { list-style: decimal; }
.legal-doc ul { list-style: disc; }
.legal-doc li { margin-bottom: 0.5em; }
.legal-doc li > ol, .legal-doc li > ul { margin-top: 0.5em; }
.legal-doc .table-wrap { margin: 18px 0 26px; }
.legal-doc .legal-date { text-align: right; color: var(--muted); margin-top: 36px; font-size: 13.5px; }

/* ---------- 経営合宿 開催温泉 ---------- */
.onsen-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.onsen-item {
  border: 1px solid rgba(233, 217, 180, 0.28);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border-radius: 8px; padding: 24px 8px 18px; text-align: center;
  font-family: var(--font-serif); font-size: 17.5px; font-weight: 600;
  letter-spacing: 0.12em; color: #fff;
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}
.onsen-item:hover { border-color: rgba(179, 146, 79, 0.75); background: rgba(179, 146, 79, 0.1); transform: translateY(-2px); }
.onsen-item::after {
  content: ""; display: block; width: 22px; height: 2px;
  background: var(--gold); margin: 13px auto 0; opacity: 0.9;
}
.onsen-more {
  text-align: center; color: var(--gold-pale); font-family: var(--font-serif);
  font-size: 14.5px; letter-spacing: 0.3em; margin-top: 30px;
}
@media (max-width: 1024px) { .onsen-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) {
  .onsen-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .onsen-item { font-size: 14px; padding: 18px 6px 14px; letter-spacing: 0.08em; }
}

/* ---------- フォーム ---------- */
.form-box { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 44px 40px; box-shadow: var(--shadow-soft); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.form-field { display: flex; flex-direction: column; gap: 8px; }
.form-field--full { grid-column: 1 / -1; }
.form-field > label { font-size: 14px; font-weight: 700; color: var(--navy-900); }
.required-mark { color: #a4403c; font-size: 11px; border: 1px solid #c9807d; border-radius: 4px; padding: 1px 7px; margin-left: 8px; font-weight: 700; vertical-align: middle; }
.optional-mark { color: var(--muted); font-size: 11px; border: 1px solid var(--line); border-radius: 4px; padding: 1px 7px; margin-left: 8px; vertical-align: middle; }
.form-field input, .form-field select, .form-field textarea {
  font-family: var(--font-sans); font-size: 15px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 6px; background: var(--paper);
  color: var(--ink); transition: border-color 0.2s, background 0.2s; width: 100%;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--gold); background: #fff;
}
.form-field textarea { min-height: 150px; resize: vertical; }
.check-group { display: flex; flex-wrap: wrap; gap: 10px 24px; }
.check-item { display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }
.check-item input { accent-color: var(--gold-strong); width: 16px; height: 16px; }
.form-consent { font-size: 13.5px; color: var(--muted); }
.form-submit { text-align: center; margin-top: 12px; }
.form-submit .btn { min-width: 280px; }
@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-box { padding: 32px 22px; }
}

/* ---------- アニメーション ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 1024px) {
  .site-nav > a:not(.btn) { display: none; }
  .site-nav.is-open-wrap { display: flex; }
  .nav-toggle { display: block; }
  .site-nav {
    position: fixed; inset: 72px 0 auto 0; background: #fff; flex-direction: column;
    align-items: stretch; padding: 18px 24px 26px; gap: 4px; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow); display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav.is-open > a { display: block; padding: 12px 4px; font-size: 15px; border-bottom: 1px solid var(--line); }
  .site-nav.is-open > a.btn { margin-top: 14px; border-bottom: none; text-align: center; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 820px) {
  .section { padding: 64px 0; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero { padding: 80px 0 64px; }
}
@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr; }
  .hero-actions .btn, .cta-actions .btn { width: 100%; }
}