/* ============================================================================
   BlueHub 海の学習（learn.bluehub.jp）
   子供向け・海をテーマにしたデザイン。event/quiz と色調をそろえつつ、
   「海にもぐって学ぶ」体験になるよう深度メーターや称号を強調する。
   ============================================================================ */
/* BlueHub共通デザインシステム（_docs/09_デザイン.md）へ寄せるため、旧変数名を
   BlueHubパレットに再マッピング。既存のクラス/HTML/JSは不変のまま全体が揃う。 */
:root{
  --deep:#092f4d; --ocean:#0b72b9; --aqua:#18aeca; --foam:#78d9b3; --sand:#f5fbfd;
  --ink:#102b3f; --muted:#5d7180; --gold:#ffb703; --coral:#e0572b;
  --lv-b:#18aeca; --lv-i:#0b72b9; --lv-a:#0a3a5e;
  --bh-line:rgba(16,43,63,.12);
}
*{box-sizing:border-box}
body{margin:0;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Noto Sans JP","Hiragino Kaku Gothic Pro",Meiryo,sans-serif;
  color:var(--ink);line-height:1.8;-webkit-font-smoothing:antialiased;
  background-color:#eef7f7;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.06 0 0 0 0 0.28 0 0 0 0 0.36 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");}
a{text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{width:100%;max-width:1040px;margin:0 auto;padding:0 16px}

/* ===== ヘッダー（BlueHub共通 3段。quiz/eventと同一） ===== */
.site-header{background:rgba(255,255,255,.88);border-bottom:1px solid var(--bh-line)}
.header-util{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 0 0;font-size:.78rem;color:var(--muted);font-weight:700}
.header-util .util-note{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.header-brand{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 0 4px;text-align:center}
.brand-logo{width:min(240px,56vw);height:auto}
.brand-tagline{margin:0;font-size:.84rem;font-weight:800;color:#0f6c93;letter-spacing:.1em}
.global-nav{display:flex;align-items:center;gap:2px;min-width:0;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:6px 0 10px}
.global-nav::-webkit-scrollbar{display:none}
.global-nav > a:first-child{margin-left:auto}
.global-nav > a:last-child{margin-right:auto}
.global-nav a{flex:0 0 auto;padding:8px 14px;border-radius:999px;font-size:.9rem;font-weight:800;color:#0b5687}
.global-nav a:hover{background:rgba(24,174,202,.12)}
.global-nav a.is-current{background:rgba(11,114,185,.12)}

/* 旧ヘッダー（後方互換で一応残す） */
.lh{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--bh-line)}
.lh-in{display:flex;align-items:center;justify-content:space-between;height:60px}
.lh-brand{font-size:1.3rem;font-weight:800;color:var(--ocean);display:flex;align-items:center;gap:8px}
.lh-nav{display:flex;gap:8px;flex-wrap:wrap}
.lh-nav a{font-size:.82rem;font-weight:700;color:var(--ocean);background:#eef7f7;border:1.5px solid #cfe7f4;border-radius:999px;padding:6px 14px}
.lh-user{font-size:.8rem;color:var(--muted);display:flex;align-items:center;gap:6px}
.lh-user .dot{width:8px;height:8px;border-radius:50%;background:#28c76f}

/* ===== ヒーロー（海の中）===== */
.hero{position:relative;overflow:hidden;color:#fff;text-align:center;
  background:linear-gradient(180deg,#0a6ebd 0%,#0b5687 40%,#092f4d 100%);padding:38px 0 60px}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:46px;
  background:radial-gradient(80% 100% at 50% 0,#eef7f7 46%,transparent 47%) repeat-x;background-size:90px 46px}
.hero .bubbles span{position:absolute;bottom:-30px;background:rgba(255,255,255,.18);border-radius:50%;
  animation:rise linear infinite}
@keyframes rise{to{transform:translateY(-460px);opacity:0}}
.hero-badge{display:inline-block;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);
  border-radius:999px;padding:5px 16px;font-size:.8rem;font-weight:700;margin-bottom:12px}
.hero h1{font-size:2.1rem;font-weight:800;margin:6px 0 10px;line-height:1.4;text-shadow:0 2px 18px rgba(0,0,0,.2)}
.hero p{opacity:.95;font-size:1rem;line-height:1.8;margin:0}
.hero .kame{width:96px;margin-bottom:6px;filter:drop-shadow(0 6px 14px rgba(0,0,0,.25))}

/* ===== 深度メーター（学びの進み具合を潜水で表現）===== */
.depth{position:relative;max-width:760px;margin:-38px auto 0;z-index:5;background:#fff;
  border-radius:22px;box-shadow:0 14px 40px rgba(10,60,110,.16);padding:18px 22px}
.depth-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.depth-title{font-weight:800;color:var(--deep)}
.depth-title small{display:block;font-weight:600;color:var(--muted);font-size:.76rem}
.depth-pct{font-size:1.6rem;font-weight:800;color:var(--ocean)}
.depth-bar{position:relative;height:16px;border-radius:999px;background:linear-gradient(90deg,#cdeaf6,#bfe0f2);overflow:hidden}
.depth-fill{position:absolute;inset:0 auto 0 0;background:linear-gradient(90deg,#21b6c4,#0a6ebd);border-radius:999px;
  width:0;transition:width .8s cubic-bezier(.2,.8,.2,1)}
.depth-sub{margin-top:10px;font-size:.82rem;color:var(--muted);display:flex;gap:14px;flex-wrap:wrap}
.depth-sub b{color:var(--ocean)}
#login-state{margin-left:auto}

/* ===== 称号バッジ ===== */
.titles{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:14px}
.title-badge{display:flex;align-items:center;gap:8px;background:#f2f9fc;border:1.5px dashed #cfe0ec;
  color:var(--muted);border-radius:14px;padding:8px 14px;font-weight:700;font-size:.85rem}
.title-badge.earned{background:linear-gradient(135deg,#fff7e0,#ffe9b0);border:1.5px solid var(--gold);
  color:#8a5a00;box-shadow:0 6px 18px rgba(255,183,3,.25)}
.title-badge .em{font-size:1.3rem}

/* ===== セクション見出し ===== */
.sec-title{font-size:1.3rem;font-weight:800;color:var(--deep);margin:30px 0 4px}
.sec-lead{color:var(--muted);font-size:.9rem;margin-bottom:14px}

/* ===== レベルタブ ===== */
.levtabs{display:flex;gap:10px;justify-content:center;margin:8px 0 20px;flex-wrap:wrap}
.levtab{border:2px solid #cfe7f4;background:#fff;border-radius:16px;padding:12px 20px;cursor:pointer;
  font-weight:800;color:var(--muted);transition:.15s;min-width:150px;text-align:center}
.levtab .em{font-size:1.5rem;display:block}
.levtab small{display:block;font-weight:600;font-size:.75rem;opacity:.8}
.levtab.active{color:#fff;border-color:transparent;transform:translateY(-2px);box-shadow:0 10px 24px rgba(10,60,110,.2)}
.levtab[data-level="beginner"].active{background:linear-gradient(135deg,#42c0e8,#1f9fd1)}
.levtab[data-level="intermediate"].active{background:linear-gradient(135deg,#2a92e0,#1461b8)}
.levtab[data-level="advanced"].active{background:linear-gradient(135deg,#5b5be0,#2e2e9e)}

/* ===== 学習マップ（テーマカード）===== */
.map{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.tcard{position:relative;display:flex;flex-direction:column;background:#fff;border-radius:20px;overflow:hidden;
  box-shadow:0 8px 22px rgba(10,60,110,.09);border:1px solid #e7f1f8;transition:.18s}
.tcard:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(10,60,110,.16)}
.tcard-top{padding:18px 18px 14px;color:#fff;position:relative}
.tcard-ico{font-size:2.2rem;filter:drop-shadow(0 2px 4px rgba(0,0,0,.2))}
.tcard-ttl{font-size:1.15rem;font-weight:800;margin-top:6px}
.tcard-body{padding:14px 18px 18px;display:flex;flex-direction:column;gap:10px;flex:1}
.tcard-tags{display:flex;gap:6px;flex-wrap:wrap}
.tcard-tag{font-size:.75rem;font-weight:700;color:var(--ocean);background:#eef7f7;border-radius:999px;padding:3px 10px}
.tcard-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto}
.tcard-go{font-weight:800;color:var(--ocean);font-size:.9rem}
.tcard-badge{position:absolute;top:14px;right:14px;background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.4);
  color:#fff;border-radius:999px;font-size:.72rem;font-weight:700;padding:3px 10px}
.tcard .done-chk{color:#28c76f;font-weight:800;font-size:.82rem}
.tcard-progress{height:8px;border-radius:999px;background:#e7f1f8;overflow:hidden}
.tcard-progress > i{display:block;height:100%;background:linear-gradient(90deg,#21b6c4,#0a6ebd);width:0;transition:.6s}

/* ===== 検定への誘い（大きなカード）===== */
.exam-invite{position:relative;overflow:hidden;border-radius:24px;color:#fff;padding:26px 26px;margin-top:18px;
  background:linear-gradient(135deg,#092f4d,#0a6ebd 60%,#21b6c4);box-shadow:0 14px 40px rgba(10,60,110,.25)}
.exam-invite h3{font-size:1.5rem;font-weight:800;margin:0 0 6px}
.exam-invite p{opacity:.94;margin:0 0 14px;line-height:1.7;font-size:.95rem}
.exam-invite .stamp{position:absolute;right:-10px;top:-10px;font-size:7rem;opacity:.12;transform:rotate(12deg)}
.btn-exam{display:inline-flex;align-items:center;gap:8px;background:var(--gold);color:#5a3d00;font-weight:800;
  border:0;border-radius:14px;padding:13px 26px;font-size:1.02rem;box-shadow:0 8px 20px rgba(255,183,3,.4);cursor:pointer;transition:.15s}
.btn-exam:hover{filter:brightness(1.05);transform:translateY(-2px)}
.exam-invite .req{display:inline-block;margin-left:12px;font-size:.82rem;opacity:.9}
.exam-invite.passed{background:linear-gradient(135deg,#0b7a4b,#16a34a 60%,#4ade80)}

/* ===== 共通ボタン ===== */
.btn-ocean{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#0a6ebd,#21b6c4);
  color:#fff;font-weight:800;border:0;border-radius:14px;padding:12px 24px;cursor:pointer;transition:.15s;font-size:1rem}
.btn-ocean:hover{filter:brightness(1.07);transform:translateY(-2px);color:#fff}
.btn-ghost{display:inline-flex;align-items:center;gap:6px;background:#fff;color:var(--ocean);font-weight:800;
  border:2px solid #cfe7f4;border-radius:14px;padding:10px 20px;cursor:pointer;transition:.15s}
.btn-ghost:hover{border-color:var(--ocean)}

/* ===== 学習ページ ===== */
.learn-head{color:#fff;padding:30px 0 46px;position:relative;overflow:hidden}
.learn-head::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:40px;
  background:radial-gradient(80% 100% at 50% 0,#eef7f7 46%,transparent 47%) repeat-x;background-size:80px 40px}
.learn-head .crumbs{font-size:.82rem;opacity:.9;margin-bottom:6px}
.learn-head .crumbs a{color:#fff;text-decoration:underline;opacity:.9}
.learn-head h1{font-size:1.7rem;font-weight:800;margin:2px 0 4px}
.learn-head .lv-pill{display:inline-block;background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.4);
  border-radius:999px;padding:3px 14px;font-size:.8rem;font-weight:700}
.intro-balloon{max-width:760px;margin:-30px auto 0;position:relative;z-index:3;background:#fff;border-radius:18px;
  box-shadow:0 12px 32px rgba(10,60,110,.14);padding:16px 18px;display:flex;gap:14px;align-items:center}
.intro-balloon img{width:60px;flex:none}
.intro-balloon p{margin:0;color:#274b63;font-weight:600;line-height:1.7}

.sec-card{background:#fff;border-radius:20px;box-shadow:0 8px 22px rgba(10,60,110,.08);
  border:1px solid #e7f1f8;padding:22px 24px;margin-top:18px}
.sec-card .sh{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.sec-card .sh .em{font-size:1.8rem}
.sec-card .sh h2{font-size:1.22rem;font-weight:800;color:var(--deep);margin:0}
.sec-card .sh .no{margin-left:auto;font-size:.8rem;color:#b6c9d6;font-weight:800}
.sec-card p.txt{margin:0;line-height:2;font-size:1.02rem;color:#25455c}

/* ===== 確認クイズ / 検定 共通の問題UI ===== */
.quiz-wrap{background:#fff;border-radius:20px;box-shadow:0 8px 22px rgba(10,60,110,.08);
  border:1px solid #e7f1f8;padding:22px 24px;margin-top:22px}
.quiz-wrap.exam{margin-top:0}
.quiz-topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.quiz-kicker{font-weight:800;color:var(--ocean)}
.quiz-count{font-size:.85rem;color:var(--muted);font-weight:700}
.quiz-bar{height:8px;border-radius:999px;background:#e7f1f8;overflow:hidden;margin-bottom:18px}
.quiz-bar > i{display:block;height:100%;background:linear-gradient(90deg,#21b6c4,#0a6ebd);width:0;transition:.4s}
.quiz-theme{display:inline-block;font-size:.75rem;font-weight:700;color:#fff;border-radius:999px;padding:2px 12px;margin-bottom:10px}
.quiz-q{font-size:1.2rem;font-weight:800;color:var(--deep);line-height:1.6;margin-bottom:16px}
.choices{display:grid;gap:10px}
.choice{display:flex;align-items:center;gap:12px;background:#f7fbfe;border:2px solid #e2eef6;border-radius:14px;
  padding:14px 16px;cursor:pointer;transition:.12s;font-weight:700;color:#274b63;text-align:left;width:100%}
.choice:hover{border-color:var(--aqua);background:#f0f9fd}
.choice .mk{width:28px;height:28px;flex:none;border-radius:50%;background:#e2eef6;color:var(--ocean);
  display:grid;place-items:center;font-weight:800;font-size:.9rem}
.choice.correct{border-color:#28c76f;background:#eafaf1;color:#0b7a45}
.choice.correct .mk{background:#28c76f;color:#fff}
.choice.wrong{border-color:var(--coral);background:#fdeeee;color:#c53030}
.choice.wrong .mk{background:var(--coral);color:#fff}
.choice[disabled]{cursor:default}
.explain{margin-top:16px;display:none}
.kame-balloon{display:flex;gap:12px;align-items:flex-start;background:#eef8fc;border:1px solid #d4ecf6;
  border-radius:16px;padding:14px 16px}
.kame-balloon img{width:52px;flex:none}
.kame-balloon .kn{font-weight:800;color:var(--ocean);font-size:.85rem;margin-bottom:2px}
.kame-balloon .kt{margin:0;color:#274b63;line-height:1.8;font-weight:600}
.result-flash{font-weight:800;margin-bottom:10px}
.result-flash.ok{color:#0b7a45}.result-flash.ng{color:#c53030}

/* ===== 検定 認定証 ===== */
.cert{max-width:680px;margin:0 auto;background:
  radial-gradient(120% 120% at 0 0,#fff 60%,#fff8e6),#fff;border:3px solid var(--gold);border-radius:24px;
  padding:34px 30px;text-align:center;box-shadow:0 20px 50px rgba(10,60,110,.18);position:relative;overflow:hidden}
.cert::before{content:"🌊";position:absolute;font-size:9rem;opacity:.06;left:-10px;bottom:-20px}
.cert .seal{font-size:3.4rem}
.cert h2{font-size:1.7rem;font-weight:800;color:var(--deep);margin:6px 0}
.cert .title-name{font-size:2.1rem;font-weight:800;margin:8px 0;
  background:linear-gradient(135deg,#b8860b,#ffb703);-webkit-background-clip:text;background-clip:text;color:transparent}
.cert .score{font-size:1.1rem;color:var(--muted);font-weight:700;margin:6px 0}
.cert .score b{color:var(--ocean);font-size:1.4rem}
.cert .foot{margin-top:16px;font-size:.82rem;color:var(--muted);line-height:1.7}
.cert-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.fail-box{max-width:620px;margin:0 auto;background:#fff;border-radius:22px;border:1px solid #e7f1f8;
  box-shadow:0 12px 32px rgba(10,60,110,.1);padding:30px;text-align:center}
.fail-box .em{font-size:3rem}
.fail-box h2{font-weight:800;color:var(--deep)}

/* ===== フッター ===== */
.lf{background:#092f4d;color:#cfe3f2;margin-top:40px;padding:26px 0;text-align:center;font-size:.85rem}
.lf a{color:#9fd0ec}
.lf .logo{height:34px;margin-bottom:10px;filter:brightness(0) invert(1);opacity:.9}

/* ===== レスポンシブ ===== */
@media(max-width:560px){
  .hero h1{font-size:1.6rem}.depth{margin-top:-30px;padding:16px}
  .levtab{min-width:44%}.exam-invite h3{font-size:1.25rem}
  .cert .title-name{font-size:1.7rem}
}