/* =========================================================
   トリセツ! — 生徒用Webアプリ プロトタイプ
   スマホファースト + レスポンシブ（PCは左サイドバー）
   ========================================================= */
:root{
  --c-teal:#64a19c;--c-blue:#76a3db;--c-gold:#d29a24;--c-purple:#bf6ea3;
  --brand:var(--c-teal);--brand-dark:#4f857f;
  --bg:#f4f6f7;--surface:#fff;--line:#e6eaec;
  --text:#1f2a2e;--text-sub:#65757b;--text-mute:#9aa7ac;
  --ok:#3a9d6e;--warn:#d29a24;--danger:#d2604f;
  --radius:14px;--shadow:0 2px 10px rgba(31,42,46,.06);--shadow-lg:0 10px 30px rgba(31,42,46,.16);
  --font:"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,system-ui,sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;}

/* ===== レイアウト ===== */
.shell{display:flex;min-height:100vh;}
.sidebar{
  width:236px;flex:0 0 236px;background:var(--surface);border-right:1px solid var(--line);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:10px;padding:20px 18px;border-bottom:1px solid var(--line);}
.brand-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--c-teal),var(--c-blue));display:flex;align-items:center;justify-content:center;font-size:20px;}
.brand-name{font-weight:800;font-size:16px;}
.side-nav{flex:1;padding:14px 12px;display:flex;flex-direction:column;gap:4px;}
.snav{display:flex;align-items:center;gap:12px;border:0;background:none;cursor:pointer;
  font-family:inherit;font-size:15px;font-weight:600;color:var(--text-sub);
  padding:12px 14px;border-radius:11px;text-align:left;width:100%;}
.snav .ico{font-size:20px;}
.snav:hover{background:var(--bg);}
.snav.active{background:#eaf3f2;color:var(--brand-dark);font-weight:800;}
.side-foot{padding:14px;border-top:1px solid var(--line);}

.main-col{flex:1;min-width:0;display:flex;flex-direction:column;}
.topbar{
  position:sticky;top:0;z-index:10;background:rgba(255,255,255,.9);backdrop-filter:blur(6px);
  border-bottom:1px solid var(--line);height:60px;display:flex;align-items:center;gap:12px;padding:0 22px;
}
.hdr-back{border:0;background:var(--bg);color:var(--brand);font-weight:700;cursor:pointer;
  padding:8px 14px;border-radius:10px;font-size:14px;font-family:inherit;}
.hdr-back:hover{filter:brightness(.97);}
.hdr-title{flex:1;font-size:18px;font-weight:800;margin:0;}
.topbar-user{display:flex;align-items:center;}

.content{flex:1;padding:24px;max-width:1100px;width:100%;margin:0 auto;}

.bottom-nav{display:none;}

/* スマホ幅: サイドバー → 下部ナビ */
@media (max-width:820px){
  .sidebar{display:none;}
  .topbar{padding:0 14px;}
  .content{padding:16px 14px 86px;}
  .bottom-nav{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:50;
    background:var(--surface);border-top:1px solid var(--line);padding:6px 4px;
  }
  .nav-item{flex:1;border:0;background:none;cursor:pointer;display:flex;flex-direction:column;
    align-items:center;gap:2px;padding:6px 0;color:var(--text-mute);font-size:11px;font-weight:600;font-family:inherit;}
  .nav-ico{font-size:21px;}
  .nav-item.active{color:var(--brand);}
}

/* ===== 汎用 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;cursor:pointer;
  font-family:inherit;font-size:16px;font-weight:700;padding:14px 18px;background:var(--brand);color:#fff;
  transition:filter .15s,transform .05s;}
.btn:hover{filter:brightness(1.05);}.btn:active{transform:translateY(1px);}
.btn.secondary{background:#fff;color:var(--brand);border:2px solid var(--brand);}
.btn.ghost{background:var(--bg);color:var(--text);}
.btn.line{background:#06c755;color:#fff;}
.btn.danger{background:#fff;color:var(--danger);border:2px solid var(--danger);}
.btn.sm{padding:9px 14px;font-size:13px;border-radius:10px;}
.btn.block{width:100%;}
.btn:disabled{opacity:.5;cursor:not-allowed;}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;}
.link{background:none;border:0;color:var(--brand);font-weight:700;cursor:pointer;font-size:14px;font-family:inherit;padding:4px;}
.link:hover{text-decoration:underline;}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;}
.field{margin-bottom:14px;}
.field label{display:block;font-size:13px;font-weight:700;color:var(--text-sub);margin-bottom:6px;}
.field input,.field select,.field textarea{width:100%;padding:13px 14px;font-size:16px;font-family:inherit;border:1.5px solid var(--line);border-radius:11px;background:#fff;color:var(--text);}
.field input:focus,.field select:focus{outline:none;border-color:var(--brand);}
.field .hint{font-size:12px;color:var(--text-mute);margin-top:5px;}
.hint{font-size:12px;color:var(--text-mute);}

.badge{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--bg);color:var(--text-sub);}
.badge.ok{background:#e6f4ee;color:var(--ok);}
.badge.warn{background:#fbf1dc;color:#a9781a;}
.badge.danger{background:#fbe7e3;color:var(--danger);}
.badge.info{background:#e9f1fb;color:#3f6fa8;}
.badge.brand{background:#e3f0ef;color:var(--brand-dark);}

.section-title{font-size:13px;font-weight:700;color:var(--text-mute);margin:20px 2px 10px;}
.divider{height:1px;background:var(--line);margin:14px 0;}
.progress{height:8px;border-radius:999px;background:#e9eef0;overflow:hidden;}
.progress>i{display:block;height:100%;border-radius:999px;background:var(--brand);}
.progress.thin{height:5px;}

.list-row{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line);
  background:var(--surface);cursor:pointer;text-align:left;width:100%;border:0;font-family:inherit;font-size:15px;color:var(--text);}
.list-row:last-child{border-bottom:0;}
.list-row:hover{background:#fafbfb;}
.list-row .lr-main{flex:1;min-width:0;}
.list-row .lr-title{font-weight:700;}
.list-row .lr-sub{font-size:12px;color:var(--text-mute);}
.list-row .lr-chev{color:var(--text-mute);font-size:22px;}

.empty{text-align:center;color:var(--text-mute);padding:60px 20px;}
.empty .big{font-size:46px;margin-bottom:8px;}

.kv{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px;}
.kv:last-child{border-bottom:0;}
.kv .k{color:var(--text-sub);}.kv .v{font-weight:700;text-align:right;}

.note{background:#f0f6f5;border:1px solid #d8e7e5;border-radius:12px;padding:13px 16px;font-size:13px;color:var(--text-sub);}
.note.warn{background:#fbf4e3;border-color:#eed9a8;color:#8a6614;}
.note.danger{background:#fbeae6;border-color:#f0c7bd;color:#9c3a29;}

/* ===== 認証 ===== */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;
  background:radial-gradient(120% 60% at 50% 0%,#eaf3f2 0%,var(--bg) 55%);}
.auth-card{width:100%;max-width:420px;}
.auth-logo{text-align:center;margin-bottom:22px;}
.auth-logo .mark{width:64px;height:64px;border-radius:18px;margin:0 auto 12px;background:linear-gradient(135deg,var(--c-teal),var(--c-blue));display:flex;align-items:center;justify-content:center;font-size:32px;box-shadow:var(--shadow);}
.auth-logo h1{font-size:24px;margin:0;}
.auth-logo p{font-size:13px;color:var(--text-sub);margin:4px 0 0;}
.auth-card .card{padding:24px;}
.auth-foot{margin-top:18px;display:flex;flex-direction:column;gap:8px;align-items:center;}
.or-sep{display:flex;align-items:center;gap:10px;color:var(--text-mute);font-size:12px;margin:16px 0;}
.or-sep::before,.or-sep::after{content:"";flex:1;height:1px;background:var(--line);}
.steps{display:flex;gap:6px;margin-bottom:18px;}
.steps>i{flex:1;height:5px;border-radius:999px;background:var(--line);}
.steps>i.on{background:var(--brand);}
.full{width:100%;}

/* ===== 書籍カード（Webはグリッド） ===== */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;}
.book-card{display:flex;gap:16px;padding:16px;align-items:center;cursor:pointer;}
.book-thumb{width:88px;height:118px;flex:0 0 auto;border-radius:10px;display:flex;align-items:flex-end;padding:8px;color:#fff;font-weight:800;font-size:14px;box-shadow:var(--shadow);}
.book-card .bc-main{flex:1;min-width:0;}
.book-card .bc-title{font-weight:800;font-size:17px;margin-bottom:4px;}
.book-card .bc-meta{font-size:12px;color:var(--text-sub);}
.book-card .bc-prog{margin-top:10px;}
.book-card.expired{opacity:.72;}

/* プレイヤー（Webは大きく、横並びも可） */
.player-layout{display:grid;grid-template-columns:1fr;gap:20px;}
@media (min-width:980px){.player-layout{grid-template-columns:1.7fr 1fr;align-items:start;}}
.player{background:#0e1416;color:#fff;position:relative;aspect-ratio:16/9;width:100%;border-radius:14px;overflow:hidden;display:flex;align-items:center;justify-content:center;}
.player .pl-bg{position:absolute;inset:0;background:radial-gradient(circle at 50% 40%,#25343a,#0e1416);}
.player .pl-play{position:relative;width:84px;height:84px;border-radius:50%;background:rgba(255,255,255,.16);border:0;color:#fff;font-size:34px;cursor:pointer;display:flex;align-items:center;justify-content:center;}
.player .pl-time{position:absolute;left:0;right:0;bottom:0;padding:12px 14px;display:flex;align-items:center;gap:10px;font-size:12px;background:linear-gradient(transparent,rgba(0,0,0,.55));}
.player .pl-bar{flex:1;height:6px;border-radius:999px;background:rgba(255,255,255,.3);overflow:hidden;}
.player .pl-bar>i{display:block;height:100%;background:var(--c-blue);}
.player .pl-badge{position:absolute;top:12px;left:12px;font-size:11px;background:rgba(0,0,0,.5);padding:4px 9px;border-radius:8px;}

.video-row{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line);background:#fff;}
.video-row:last-child{border-bottom:0;}
.video-row .vr-play{width:44px;height:44px;flex:0 0 auto;border-radius:50%;border:0;cursor:pointer;background:var(--bg);color:var(--brand);font-size:18px;display:flex;align-items:center;justify-content:center;}
.video-row .vr-play.done{background:var(--brand);color:#fff;}
.video-row .vr-main{flex:1;min-width:0;cursor:pointer;}
.video-row .vr-title{font-weight:700;font-size:15px;}
.video-row .vr-sub{font-size:11px;color:var(--text-mute);margin-top:2px;display:flex;gap:8px;flex-wrap:wrap;}
.video-row .vr-dl{border:0;background:none;cursor:pointer;font-size:21px;color:var(--text-mute);padding:6px;}
.video-row .vr-dl.done{color:var(--ok);}

.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;}
.stat .s-num{font-size:26px;font-weight:800;}
.stat .s-lbl{font-size:12px;color:var(--text-sub);}

.qr-box{aspect-ratio:1;max-width:300px;background:#0e1416;border-radius:16px;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;margin:0 auto;}
.qr-frame{width:62%;aspect-ratio:1;border:3px solid rgba(255,255,255,.5);border-radius:14px;position:relative;}
.qr-frame::before{content:"";position:absolute;left:6px;right:6px;height:2px;background:var(--c-blue);top:50%;box-shadow:0 0 12px var(--c-blue);animation:scan 2.4s ease-in-out infinite;}
@keyframes scan{0%,100%{top:14%;}50%{top:86%;}}

.toast{position:fixed;left:50%;bottom:30px;transform:translateX(-50%);background:#1f2a2e;color:#fff;padding:12px 20px;border-radius:12px;font-size:14px;font-weight:600;z-index:1000;box-shadow:var(--shadow-lg);}
@media (max-width:820px){.toast{bottom:80px;}}

.modal-overlay{position:fixed;inset:0;background:rgba(20,28,31,.5);z-index:900;display:flex;align-items:center;justify-content:center;padding:18px;}
.modal{background:#fff;width:100%;max-width:460px;border-radius:18px;padding:24px;max-height:86vh;overflow-y:auto;box-shadow:var(--shadow-lg);}
.modal h3{margin:0 0 6px;font-size:19px;}
.modal .m-sub{color:var(--text-sub);font-size:13px;margin-bottom:16px;}

/* グリッド補助 */
.narrow{max-width:560px;}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
@media (max-width:560px){.row-2{grid-template-columns:1fr;}}

/* hidden属性を常に優先（display指定で上書きされ、モーダル等が表示されてしまう不具合の修正） */
[hidden]{display:none !important;}