/* =========================================================
   ゼロから学ぶ MEO対策実践マスター — 共通スタイル
   ブランド: クリーム × テラコッタ（温かみのある手づくり路線）
   ========================================================= */
:root{
  --cream:#FBF1DD;
  --paper:#FFFBF3;
  --ink:#2A1B0E;
  --ink-soft:#5B4733;
  --terra:#DB5F22;
  --terra-deep:#B8400F;
  --mustard:#F6B23A;
  --mustard-soft:#FBD98F;
  --leaf:#46663A;
  --leaf-deep:#395230;
  --line:#E3CFA8;
  --line-soft:#EFE2C7;
  --shadow:0 10px 30px rgba(42,27,14,.10);
  --radius:20px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  font-family:"Zen Maru Gothic",-apple-system,"Hiragino Maru Gothic ProN",sans-serif;
  color:var(--ink);background:var(--cream);
  line-height:1.85;-webkit-font-smoothing:antialiased;font-weight:500;
}
a{color:var(--terra-deep);text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:920px;margin:0 auto;padding:0 20px;}
.wrap-narrow{max-width:720px;margin:0 auto;padding:0 20px;}

/* ===== トップバー ===== */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(251,241,221,.88);backdrop-filter:blur(8px);
  border-bottom:1.5px solid var(--line);
}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:58px;}
.topbar .logo{font-family:"Klee One",serif;font-weight:600;font-size:18px;color:var(--terra-deep);}
.topbar .logo b{color:var(--terra);}
.topbar nav a{font-size:14px;font-weight:700;color:var(--ink-soft);margin-left:18px;}
.topbar nav a:hover{color:var(--terra);}

/* ===== ヒーロー（トップページ） ===== */
.hero{
  background:linear-gradient(168deg,var(--terra) 0%,var(--terra-deep) 100%);
  color:#FFF7EC;text-align:center;padding:64px 24px 76px;position:relative;overflow:hidden;
}
.hero::after{content:"";position:absolute;inset:0;background:
  radial-gradient(circle at 20% 20%,rgba(255,255,255,.12),transparent 40%),
  radial-gradient(circle at 85% 70%,rgba(255,255,255,.08),transparent 35%);pointer-events:none;}
.hero .badge{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:.06em;
  background:rgba(255,247,236,.2);border:1.5px solid rgba(255,247,236,.6);
  padding:6px 18px;border-radius:999px;margin-bottom:22px;position:relative;
}
.hero h1{font-family:"Klee One",serif;font-weight:600;font-size:clamp(34px,7vw,52px);line-height:1.3;position:relative;}
.hero h1 b{color:var(--mustard);}
.hero .lead{margin:22px auto 0;max-width:600px;font-size:clamp(16px,3.4vw,19px);line-height:1.85;opacity:.96;position:relative;}
.hero .meta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:30px;position:relative;}
.hero .meta span{
  background:rgba(255,247,236,.18);border:1.5px solid rgba(255,247,236,.45);
  border-radius:999px;padding:7px 16px;font-size:14px;font-weight:700;
}
.hero .cta{
  display:inline-block;margin-top:34px;background:var(--mustard);color:var(--ink);
  font-weight:900;font-size:18px;padding:15px 40px;border-radius:999px;position:relative;
  box-shadow:0 8px 0 var(--terra-deep);transition:transform .12s,box-shadow .12s;
}
.hero .cta:hover{transform:translateY(2px);box-shadow:0 6px 0 var(--terra-deep);}
.wave{display:block;width:100%;height:22px;margin-top:-1px;}

/* ===== セクション見出し ===== */
.sec-head{text-align:center;margin:60px 0 34px;}
.sec-head .k{font-size:15px;font-weight:700;color:var(--leaf);letter-spacing:.04em;}
.sec-head h2{font-family:"Klee One",serif;font-weight:600;font-size:clamp(26px,5vw,34px);margin-top:6px;}
.sec-head p{margin-top:10px;color:var(--ink-soft);font-size:15px;}

/* ===== カリキュラム（ステージ） ===== */
.stages{padding-bottom:40px;}
.stage{
  background:var(--paper);border:2px solid var(--line);border-radius:var(--radius);
  padding:24px 22px;margin-bottom:22px;box-shadow:var(--shadow);
}
.stage-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:18px;}
.stage-no{
  flex:none;width:54px;height:54px;border-radius:16px;
  background:linear-gradient(160deg,var(--terra),var(--terra-deep));color:#FFF7EC;
  display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1;
}
.stage-no small{font-size:10px;font-weight:700;opacity:.85;}
.stage-no b{font-size:24px;font-weight:900;}
.stage-title h3{font-family:"Klee One",serif;font-weight:600;font-size:22px;line-height:1.4;}
.stage-title p{font-size:14px;color:var(--ink-soft);margin-top:4px;}
.lesson-list{list-style:none;}
.lesson-list li{border-top:1.5px dashed var(--line);}
.lesson-list li:first-child{border-top:none;}
.lesson-list a{
  display:flex;align-items:center;gap:14px;padding:14px 6px;transition:background .12s;border-radius:12px;
}
.lesson-list a:hover{background:var(--cream);}
.lesson-list .ln{
  flex:none;width:34px;height:34px;border-radius:50%;background:var(--cream);
  border:1.5px solid var(--line);color:var(--terra-deep);font-weight:900;font-size:14px;
  display:flex;align-items:center;justify-content:center;
}
.lesson-list .lt{flex:1;font-weight:700;font-size:16px;line-height:1.45;}
.lesson-list .ld{flex:none;font-size:13px;font-weight:700;color:var(--ink-soft);background:var(--line-soft);padding:3px 10px;border-radius:999px;}

/* ===== 特徴カード ===== */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;}
.feature{background:var(--paper);border:2px solid var(--line);border-radius:18px;padding:22px 20px;text-align:center;}
.feature .ic{font-size:34px;}
.feature h4{font-family:"Klee One",serif;font-size:18px;font-weight:600;margin:8px 0 6px;}
.feature p{font-size:14px;color:var(--ink-soft);}

/* ===== フッター ===== */
.foot{background:var(--leaf-deep);color:#EAF0E4;text-align:center;padding:44px 24px;margin-top:60px;}
.foot .sign{font-family:"Klee One",serif;font-size:20px;font-weight:600;color:var(--mustard);}
.foot p{font-size:13px;opacity:.85;margin-top:8px;}

/* =========================================================
   レッスンページ
   ========================================================= */
.lesson-hero{
  background:linear-gradient(168deg,var(--leaf),var(--leaf-deep));color:#F2F6EE;
  padding:44px 24px 52px;text-align:center;
}
.lesson-hero .crumb{font-size:13px;font-weight:700;opacity:.85;margin-bottom:14px;}
.lesson-hero .crumb a{color:var(--mustard-soft);}
.lesson-hero .tag{
  display:inline-block;background:rgba(255,255,255,.15);border:1.5px solid rgba(255,255,255,.4);
  border-radius:999px;padding:5px 15px;font-size:13px;font-weight:700;margin-bottom:14px;
}
.lesson-hero h1{font-family:"Klee One",serif;font-weight:600;font-size:clamp(26px,5.4vw,36px);line-height:1.4;}
.lesson-hero .lh-meta{margin-top:14px;font-size:14px;font-weight:700;opacity:.9;}

.article{background:var(--paper);}
.article .wrap-narrow{padding-top:44px;padding-bottom:60px;}
.lead-box{
  background:#FFF;border-left:5px solid var(--mustard);border-radius:0 14px 14px 0;
  padding:18px 22px;font-size:17px;font-weight:700;line-height:1.8;margin-bottom:36px;box-shadow:var(--shadow);
}
.article h2{
  font-family:"Klee One",serif;font-weight:600;font-size:24px;line-height:1.45;
  margin:44px 0 16px;padding-bottom:10px;border-bottom:3px solid var(--line);
}
.article h2 .em{margin-right:8px;}
.article h3{font-size:19px;font-weight:900;color:var(--terra-deep);margin:28px 0 10px;}
.article p{font-size:16.5px;line-height:1.95;margin-bottom:16px;}
.article p b,.article li b{background:linear-gradient(transparent 58%,var(--mustard-soft) 58%);font-weight:700;}
.article ul,.article ol{margin:0 0 18px 1.3em;}
.article li{font-size:16.5px;line-height:1.9;margin-bottom:8px;}

.note{
  background:var(--cream);border:2px dashed var(--line);border-radius:14px;
  padding:16px 20px;margin:24px 0;font-size:15.5px;
}
.note b{color:var(--terra-deep);}

/* チェックリスト */
.checklist{
  background:#FFF;border:2px solid var(--leaf);border-radius:16px;padding:22px 24px;margin:30px 0;box-shadow:var(--shadow);
}
.checklist h3{color:var(--leaf);margin-top:0;display:flex;align-items:center;gap:8px;}
.checklist ul{list-style:none;margin:14px 0 0;}
.checklist li{position:relative;padding:8px 0 8px 34px;border-top:1.5px dashed var(--line);font-weight:700;}
.checklist li:first-child{border-top:none;}
.checklist li::before{
  content:"✓";position:absolute;left:0;top:8px;width:22px;height:22px;border-radius:6px;
  background:var(--leaf);color:#fff;font-size:14px;font-weight:900;display:flex;align-items:center;justify-content:center;
}

/* クイズ */
.quiz{
  background:linear-gradient(165deg,#FFF,#FFF7EC);border:2px solid var(--terra);
  border-radius:18px;padding:24px 24px 20px;margin:34px 0;box-shadow:var(--shadow);
}
.quiz h3{color:var(--terra-deep);margin-top:0;display:flex;align-items:center;gap:8px;}
.quiz .q{font-weight:900;font-size:17px;margin:10px 0 14px;}
.quiz .opt{
  display:block;width:100%;text-align:left;background:var(--cream);border:2px solid var(--line);
  border-radius:12px;padding:12px 16px;margin-bottom:10px;font:inherit;font-weight:700;cursor:pointer;
  transition:border-color .12s,background .12s;
}
.quiz .opt:hover{border-color:var(--terra);}
.quiz .opt.correct{border-color:var(--leaf);background:#EAF3E3;}
.quiz .opt.wrong{border-color:var(--terra-deep);background:#FBE3D7;}
.quiz .explain{display:none;margin-top:10px;padding:14px 16px;background:var(--cream);border-radius:12px;font-size:15px;font-weight:700;}
.quiz .explain.show{display:block;}

/* レッスン下部ナビ */
.lesson-nav{display:flex;gap:12px;justify-content:space-between;margin-top:50px;flex-wrap:wrap;}
.lesson-nav a{
  flex:1;min-width:140px;background:var(--paper);border:2px solid var(--line);border-radius:14px;
  padding:14px 18px;font-weight:700;transition:border-color .12s;
}
.lesson-nav a:hover{border-color:var(--terra);}
.lesson-nav .nxt{text-align:right;}
.lesson-nav small{display:block;font-size:12px;color:var(--ink-soft);}
.lesson-nav b{font-size:15px;color:var(--terra-deep);}
.back-top{display:inline-block;margin-top:24px;font-weight:700;}

@media(max-width:600px){
  .lesson-list .ld{display:none;}
  .hero{padding:48px 20px 60px;}
}