/* =========================================================================
   ビジネスの学校 — デザインシステム
   tsunagiya-ai-lp 譲りの「黄色 × 黒 × 白」。Noto Sans JP 900 ＋ Inter（数字）。
   ========================================================================= */

:root{
  --yellow:#F5E000;
  --ink:#111111;
  --white:#ffffff;
  --paper:#f6f6f3;     /* やわらかい背景グレー */
  --muted:#6b6b6b;
  --line:#111111;
  --green:#2F9E6B;
  --blue:#2F8FE8;
  --orange:#E8642E;
  --purple:#7C5CFF;
  --discord:#5865F2;
  --radius:12px;
  --maxw:1080px;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:'Noto Sans JP',sans-serif;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  line-height:1.7;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.num{font-family:'Inter','Noto Sans JP',sans-serif;font-weight:800;letter-spacing:-0.01em;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;width:100%;}

/* ---------- ヘッダー ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:var(--ink);
  border-bottom:1px solid var(--ink);
}
.site-header .wrap{display:flex;align-items:center;gap:14px;min-height:54px;}
.logo{display:flex;align-items:center;gap:9px;font-weight:900;font-size:15px;color:var(--white);white-space:nowrap;}
.logo .mark{height:22px;width:auto;filter:invert(1);}
.logo .org{font-size:10.5px;color:#bdbdbd;font-weight:500;}
.header-spacer{flex:1;}
.nav{display:flex;align-items:center;gap:16px;}
.nav a.navlink{font-size:13px;font-weight:700;color:#e9e9e9;white-space:nowrap;}
.nav a.navlink:hover{color:var(--yellow);}

/* 進捗チップ（ヘッダー右） */
.progress-chip{display:flex;align-items:center;gap:8px;color:#e9e9e9;font-size:12px;font-weight:700;white-space:nowrap;}
.progress-chip .mini-bar{width:70px;height:7px;border-radius:999px;background:#3a3a3a;overflow:hidden;}
.progress-chip .mini-bar span{display:block;height:100%;background:var(--yellow);width:0;}
.progress-chip .pct{font-family:'Inter',sans-serif;font-weight:800;color:var(--yellow);}

/* auth slot */
#auth-slot{display:flex;align-items:center;gap:8px;}
.member-chip{display:inline-flex;align-items:center;gap:7px;background:#222;border:1px solid #3a3a3a;border-radius:999px;padding:4px 11px 4px 4px;font-size:12.5px;color:#fff;font-weight:700;}
.member-chip .av{width:22px;height:22px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:#3a3a3a;font-size:13px;overflow:hidden;}
.member-chip .av img{width:100%;height:100%;object-fit:cover;}
.demo-tag{background:var(--yellow);color:var(--ink);border-radius:5px;padding:1px 5px;font-size:10px;font-weight:900;}
.logout-link{font-size:11.5px;color:#9a9a9a;cursor:pointer;}
.logout-link:hover{color:#fff;}
.discord-btn{display:inline-flex;align-items:center;gap:6px;background:var(--discord);color:#fff;border:none;border-radius:999px;padding:7px 13px;font-size:12.5px;font-weight:900;cursor:pointer;white-space:nowrap;}
.discord-btn:hover{filter:brightness(1.08);}

/* ---------- ボタン ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:900;font-size:15px;border-radius:8px;padding:0 20px;min-height:54px;
  border:1px solid var(--ink);cursor:pointer;text-align:center;line-height:1.3;transition:transform .05s ease;}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--ink);color:var(--yellow);}
.btn-yellow{background:var(--yellow);color:var(--ink);border-color:var(--ink);}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--ink);}
.btn-ghost.on-dark{color:#fff;border-color:#fff;}
.btn-discord{background:var(--discord);color:#fff;border-color:var(--discord);}
.btn-discord:hover{filter:brightness(1.08);}
.btn.lg{min-height:62px;font-size:17px;padding:0 26px;}
.btn.sm{min-height:44px;font-size:13.5px;padding:0 16px;}

/* ---------- 汎用パーツ ---------- */
.pill{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--ink);border-radius:999px;
  padding:5px 11px;font-size:12px;font-weight:700;background:transparent;white-space:nowrap;line-height:1;}
.pill.level{border-color:var(--lv2,#E8642E);color:var(--lv2,#E8642E);}
.pill.free{background:var(--ink);color:var(--yellow);border-color:var(--ink);}
.pill.lock{background:#f0f0ec;color:#777;border-color:#cfcfca;}
.pill.unlocked{background:var(--green);color:#fff;border-color:var(--green);}
.tag-free{display:inline-block;background:var(--ink);color:var(--yellow);border-radius:4px;padding:1px 5px;font-size:10px;font-weight:900;margin-left:6px;}
.eyebrow{display:inline-block;font-size:13px;font-weight:800;letter-spacing:0.04em;}
.step-no{font-family:'Inter',sans-serif;font-weight:800;font-size:12px;letter-spacing:0.08em;color:var(--ink);
  border:1px solid var(--ink);border-radius:999px;padding:3px 10px;}

/* progress bar (カード・コース用) */
.progress-row{display:flex;align-items:center;gap:10px;}
.progress-bar{flex:1;height:8px;border-radius:999px;background:#ecece8;overflow:hidden;}
.progress-bar span{display:block;height:100%;background:var(--ink);width:0;transition:width .3s ease;}
.progress-pct{font-family:'Inter',sans-serif;font-weight:800;font-size:13px;color:var(--ink);min-width:38px;text-align:right;}

/* ---------- HERO（タイトル画面・黄色） ---------- */
.hero{background:var(--yellow);padding:46px 0 56px;}
.hero .eyebrow{color:var(--ink);margin-bottom:14px;}
.hero h1{font-weight:900;font-size:clamp(30px,7.4vw,56px);line-height:1.24;letter-spacing:-0.01em;margin:0 0 16px;text-wrap:balance;}
.hero h1 .hl{background:var(--ink);color:var(--yellow);padding:0 .18em;border-radius:6px;}
.hero .lead{font-weight:500;font-size:clamp(15px,3.6vw,19px);line-height:1.9;max-width:600px;margin:0 0 26px;}
.hero .lead strong{font-weight:900;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 14px;}
.hero .note{font-size:12.5px;color:#5a5a00;margin:8px 0 0;}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:34px 0 0;}
.stat{background:var(--white);border:1px solid var(--ink);border-radius:var(--radius);padding:18px 12px;text-align:center;}
.stat .ic{font-size:22px;line-height:1;margin-bottom:8px;}
.stat .n{font-family:'Inter',sans-serif;font-weight:800;font-size:clamp(22px,5vw,30px);line-height:1;}
.stat .l{font-size:11.5px;color:var(--muted);font-weight:700;margin-top:6px;}

/* ---------- セクション ---------- */
.section{padding:clamp(40px,7vw,72px) 0;}
.section.alt{background:var(--paper);}
.section.dark{background:var(--ink);color:#fff;}
.section-head{margin:0 0 26px;}
.section-head h2{font-weight:900;font-size:clamp(22px,5.2vw,34px);line-height:1.35;margin:0 0 8px;text-wrap:balance;}
.section-head p{font-size:clamp(14px,3.6vw,16px);color:var(--muted);margin:0;}
.section.dark .section-head p{color:#bdbdbd;}

/* ---------- ロードマップ（ステップ＆コース） ---------- */
.road-step{margin:0 0 40px;}
.road-head{border-left:4px solid var(--yellow);background:var(--ink);color:#fff;border-radius:10px;padding:16px 18px;margin:0 0 18px;}
.road-head .road-no{font-family:'Inter',sans-serif;font-weight:800;font-size:12px;letter-spacing:0.08em;color:var(--yellow);}
.road-head h3{font-weight:900;font-size:clamp(18px,4.6vw,24px);margin:4px 0 4px;line-height:1.3;}
.road-head p{font-size:13.5px;color:#cfcfca;margin:0;}

.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px;}

.course-card{position:relative;display:flex;flex-direction:column;background:var(--white);
  border:1px solid var(--ink);border-radius:var(--radius);overflow:hidden;transition:transform .08s ease,box-shadow .15s ease;}
.course-card:hover{transform:translateY(-3px);box-shadow:6px 6px 0 rgba(17,17,17,0.12);}
.badge-featured{position:absolute;top:12px;left:12px;z-index:2;background:var(--yellow);color:var(--ink);
  border:1px solid var(--ink);border-radius:999px;font-size:11px;font-weight:900;padding:4px 10px;}
.clear-stamp{position:absolute;top:12px;right:12px;z-index:2;background:var(--ink);color:var(--yellow);
  border-radius:999px;font-size:11px;font-weight:900;padding:4px 10px;}
.course-cover{height:96px;background:var(--paper);border-bottom:1px solid var(--ink);
  display:flex;align-items:center;justify-content:center;}
.course-cover .emoji{font-size:46px;line-height:1;}
.course-body{padding:18px 18px 20px;display:flex;flex-direction:column;flex:1;}
.course-meta{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 12px;}
.course-body h3{font-weight:900;font-size:17px;line-height:1.45;margin:0 0 8px;}
.course-body .desc{font-size:13px;color:var(--muted);line-height:1.8;margin:0 0 16px;flex:1;
  display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden;}
.course-foot{display:flex;align-items:center;justify-content:space-between;margin-top:12px;
  font-size:12px;font-weight:700;color:var(--muted);}
.course-foot .go{color:var(--ink);font-weight:900;}

/* ---------- コミュニティ（Discord） ---------- */
.community{display:grid;grid-template-columns:1.4fr 1fr;gap:24px;align-items:center;
  background:var(--ink);color:#fff;border-radius:16px;padding:clamp(24px,4vw,40px);}
.community h2{color:var(--yellow);font-weight:900;font-size:clamp(20px,4.6vw,30px);margin:0 0 14px;line-height:1.4;}
.community p{font-size:15px;line-height:1.9;color:#e6e6e6;margin:0 0 20px;}
.community .mini-note{font-size:12px;color:#9a9a9a;margin:14px 0 0;}
.community .members{text-align:center;}
.community .avatars{display:flex;justify-content:center;margin:0 0 10px;}
.community .avatars span{width:46px;height:46px;border-radius:50%;background:#2a2a2a;border:2px solid var(--ink);
  display:flex;align-items:center;justify-content:center;font-size:22px;margin-left:-10px;}
.community .avatars span:first-child{margin-left:0;}
.community .members b{font-family:'Inter',sans-serif;font-size:26px;font-weight:800;color:var(--yellow);}

/* ---------- 「これもAIで作りました」帯 ---------- */
.proof{border-left:4px solid var(--yellow);padding-left:22px;max-width:720px;}
.proof h2{color:var(--yellow);font-weight:900;font-size:clamp(20px,5vw,30px);line-height:1.4;margin:0 0 14px;}
.proof .big{font-family:'Inter',sans-serif;font-weight:800;font-size:clamp(24px,6vw,38px);color:#fff;line-height:1;margin:0 0 16px;}
.proof p{font-size:clamp(14px,3.6vw,17px);line-height:1.95;color:#fff;font-weight:500;margin:0;}

/* ---------- パンくず ---------- */
.breadcrumb{font-size:12.5px;color:var(--muted);padding:22px 0 10px;font-weight:600;}
.breadcrumb a:hover{color:var(--ink);text-decoration:underline;}

/* ---------- コース詳細 ---------- */
.course-hero{display:grid;grid-template-columns:120px 1fr;gap:22px;align-items:start;padding:14px 0 8px;}
.big-cover{width:120px;height:120px;border:1px solid var(--ink);border-radius:16px;background:var(--paper);
  display:flex;align-items:center;justify-content:center;font-size:60px;}
.course-hero h1{font-weight:900;font-size:clamp(22px,5vw,32px);line-height:1.35;margin:10px 0 10px;}
.course-hero .desc{font-size:15px;color:var(--muted);line-height:1.9;margin:0 0 14px;}
.stat-line{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;font-weight:700;color:var(--ink);}

/* 会員ノート */
.member-note{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;
  background:var(--yellow);border:1px solid var(--ink);border-radius:14px;padding:18px 20px;margin:22px 0 0;}
.member-note .mn-ic{font-size:30px;}
.member-note b{font-weight:900;font-size:15px;}
.member-note p{font-size:13px;color:#3a3a00;margin:4px 0 0;line-height:1.7;}
.member-note .mn-actions{display:flex;flex-direction:column;gap:8px;}

/* レッスン一覧（ステップリスト） */
.lesson-list{display:flex;flex-direction:column;gap:10px;}
.lesson-node{display:flex;align-items:center;gap:14px;background:var(--white);border:1px solid var(--ink);
  border-radius:var(--radius);padding:14px 16px;transition:transform .07s ease,box-shadow .15s ease;}
.lesson-node:hover{transform:translateX(2px);box-shadow:4px 4px 0 rgba(17,17,17,0.1);}
.lesson-node.done{background:#fbfbf6;}
.lesson-node.locked{opacity:.96;}
.node-badge{flex:none;width:34px;height:34px;border-radius:50%;border:1px solid var(--ink);
  display:flex;align-items:center;justify-content:center;font-family:'Inter',sans-serif;font-weight:800;font-size:15px;background:var(--white);}
.lesson-node.done .node-badge{background:var(--ink);color:var(--yellow);border-color:var(--ink);}
.lesson-node.locked .node-badge{background:#f0f0ec;color:#999;border-color:#d8d8d2;}
.node-info{flex:1;min-width:0;}
.node-info .nk{font-size:11px;font-weight:800;color:var(--muted);letter-spacing:0.02em;}
.node-info b{display:block;font-weight:900;font-size:15px;line-height:1.45;margin:2px 0;}
.node-info .ns{font-size:12.5px;color:var(--muted);line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;}
.node-state{flex:none;font-size:12px;font-weight:900;white-space:nowrap;}
.node-state.s-clear{color:var(--green);}
.node-state.s-lock{color:#999;}
.node-state.s-play{color:var(--ink);}

/* ---------- レッスン視聴 ---------- */
.player-layout{display:grid;grid-template-columns:1fr 300px;gap:26px;align-items:start;padding:8px 0 60px;}
.video-frame{position:relative;width:100%;aspect-ratio:16/9;background:var(--ink);border-radius:14px;overflow:hidden;border:1px solid var(--ink);}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;}
.video-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;color:#cfcfca;padding:20px;}
.video-placeholder .ic{font-size:42px;margin-bottom:10px;}
.video-placeholder b{display:block;font-weight:900;color:#fff;font-size:15px;}
.video-placeholder small{display:block;font-size:11.5px;color:#9a9a9a;margin-top:6px;}

.lock-screen{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#fff;padding:24px;}
.lock-screen .lk-ic{font-size:40px;margin-bottom:10px;}
.lock-screen b{font-weight:900;font-size:18px;}
.lock-screen p{font-size:13px;color:#cfcfca;max-width:380px;margin:8px 0 18px;line-height:1.7;}
.lk-actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;}

.lesson-title-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:20px 0 8px;}
.lesson-content h1{font-weight:900;font-size:clamp(20px,4.4vw,28px);line-height:1.4;margin:0 0 8px;}
.lesson-content .sum{font-size:14.5px;color:var(--muted);line-height:1.8;margin:0 0 18px;}

.lesson-body{font-size:15px;line-height:1.95;color:#222;}
.lesson-body p{margin:0 0 16px;}
.lesson-body h3{font-weight:900;font-size:17px;margin:24px 0 10px;padding-left:12px;border-left:4px solid var(--yellow);}
.lesson-body ul{margin:0 0 16px;padding-left:22px;}
.lesson-body li{margin:0 0 8px;}
.lesson-body strong{font-weight:900;}
.lesson-body .callout{background:var(--paper);border:1px solid var(--ink);border-radius:10px;padding:14px 16px;font-size:14px;line-height:1.8;margin:0 0 16px;}
.lesson-body.locked-body{position:relative;}
.blur-teaser{filter:blur(5px);opacity:.55;pointer-events:none;user-select:none;max-height:160px;overflow:hidden;}

.lesson-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin:28px 0 0;padding-top:22px;border-top:1px solid #e6e6e0;}
.btn-complete{background:var(--ink);color:var(--yellow);border-color:var(--ink);min-height:54px;padding:0 22px;}
.btn-complete.is-done{background:var(--white);color:var(--green);border-color:var(--green);}
.nav-lessons{display:flex;gap:8px;}

/* サイドバー */
.lesson-sidebar{position:sticky;top:70px;background:var(--white);border:1px solid var(--ink);border-radius:14px;overflow:hidden;}
.sb-head{background:var(--ink);color:#fff;padding:14px 16px;}
.sb-head .ctitle{font-weight:900;font-size:14px;}
.sb-head .cprog{font-size:11.5px;color:var(--yellow);font-weight:700;margin-top:4px;}
.sb-list{display:flex;flex-direction:column;max-height:60vh;overflow:auto;}
.sb-item{display:flex;align-items:center;gap:10px;padding:11px 14px;border-bottom:1px solid #efefe9;font-size:13px;line-height:1.4;}
.sb-item:hover{background:var(--paper);}
.sb-item.active{background:#fffbe0;}
.sb-item.done{color:var(--muted);}
.sb-item.locked .t{color:#a6a6a6;}
.sb-dot{flex:none;width:24px;height:24px;border-radius:50%;border:1px solid var(--ink);
  display:flex;align-items:center;justify-content:center;font-family:'Inter',sans-serif;font-weight:800;font-size:12px;background:#fff;}
.sb-item.done .sb-dot{background:var(--ink);color:var(--yellow);border-color:var(--ink);}
.sb-item.active .sb-dot{box-shadow:0 0 0 3px rgba(245,224,0,.5);}
.sb-item.locked .sb-dot{background:#f0f0ec;color:#aaa;border-color:#d8d8d2;}

/* ---------- 完了モーダル ---------- */
.clear-overlay{position:fixed;inset:0;z-index:200;background:rgba(17,17,17,.55);
  display:flex;align-items:center;justify-content:center;padding:24px;animation:fadein .2s ease;}
@keyframes fadein{from{opacity:0}to{opacity:1}}
.clear-card{background:var(--white);border:2px solid var(--ink);border-radius:18px;padding:34px 40px;text-align:center;box-shadow:10px 10px 0 var(--yellow);}
.clear-card .ic{font-size:50px;line-height:1;margin-bottom:12px;}
.clear-card .ct{font-weight:900;font-size:24px;margin-bottom:6px;}
.clear-card .cs{font-size:14px;color:var(--muted);}
.clear-card .cmeta{font-family:'Inter',sans-serif;font-weight:800;font-size:14px;color:var(--ink);margin-top:14px;
  background:var(--yellow);border-radius:999px;padding:6px 16px;display:inline-block;}

/* ---------- トースト ---------- */
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);z-index:300;
  background:var(--ink);color:#fff;font-size:13.5px;font-weight:700;padding:12px 20px;border-radius:999px;
  opacity:0;pointer-events:none;transition:opacity .25s ease,transform .25s ease;max-width:90vw;text-align:center;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ---------- フッター ---------- */
.site-footer{background:var(--ink);color:#bdbdbd;padding:38px 0 80px;}
.site-footer .wrap{display:flex;flex-direction:column;gap:14px;}
.site-footer .fmark{height:30px;width:auto;filter:invert(1);align-self:flex-start;}
.site-footer .finfo{font-size:13px;line-height:1.9;}
.site-footer a:hover{color:#fff;text-decoration:underline;}

/* ---------- レスポンシブ ---------- */
@media (max-width:860px){
  .player-layout{grid-template-columns:1fr;}
  .lesson-sidebar{position:static;order:-1;}
  .sb-list{max-height:none;}
  .community{grid-template-columns:1fr;}
  .community .members{display:flex;align-items:center;justify-content:center;gap:16px;}
}
@media (max-width:680px){
  .stats{grid-template-columns:repeat(2,1fr);}
  .course-hero{grid-template-columns:88px 1fr;gap:16px;}
  .big-cover{width:88px;height:88px;font-size:44px;}
  .member-note{grid-template-columns:1fr;text-align:left;}
  .member-note .mn-actions{flex-direction:row;}
  .nav .navlink{display:none;}        /* 狭い画面はリンクを隠してチップ＋authだけ */
  .progress-chip .mini-bar{width:54px;}
}
@media (max-width:430px){
  .progress-chip .label-text{display:none;}
}