/* ============================================================
   银河音乐 · 民谣木吉他教学库 —— 样式表（v2 · 简洁时尚）
   品牌：哑光海军蓝 #0A2463 + 星光金 #F0B03C + 纯白
   ============================================================ */
:root{
  --navy:#0A2463; --navy-2:#123a8f; --navy-3:#1b4bb0;
  --gold:#F0B03C; --gold-deep:#a9701a; --gold-soft:#FDF3DE;
  --ink:#101828; --body:#344054; --muted:#7b88a8; --faint:#9aa6c4;
  --line:#E8ECF5; --line-2:#DDE3F0;
  --bg:#F5F7FC; --card:#FFFFFF;
  --ok:#1c9e6a; --ok-soft:#E7F7EF; --warn:#B7791F; --warn-soft:#FEF6E7;
  --danger:#D9534F; --danger-soft:#FDECEB; --blue:#2F6BD8; --blue-soft:#EAF1FE;
  --r-lg:20px; --r-md:14px; --r-sm:10px;
  --sh-1:0 1px 2px rgba(16,24,40,.04), 0 10px 28px -18px rgba(16,24,40,.28);
  --sh-2:0 2px 4px rgba(16,24,40,.05), 0 18px 40px -22px rgba(10,36,99,.35);
  --nav-h:64px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--body); font-size:15px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink);letter-spacing:-.01em}
button,input{font-family:inherit}
.muted{color:var(--muted);font-size:12.5px}
b{color:var(--ink)}

/* ---------------- 顶部 ---------------- */
.app-header{
  position:fixed;top:0;left:0;right:0;z-index:60;height:56px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 14px;padding-top:env(safe-area-inset-top);
  background:linear-gradient(120deg,#081c4d 0%,var(--navy) 45%,#123a8f 100%);
}
.app-header::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(240,176,60,.85),transparent)}
.brand{display:flex;align-items:center;gap:8px;cursor:pointer}
.brand-mark{height:24px;display:block}
.brand-cn{height:19px;display:block;opacity:.97}
.header-actions{display:flex;align-items:center;gap:6px}
.icon-btn{
  width:36px;height:36px;border:0;border-radius:12px;background:rgba(255,255,255,.10);
  display:flex;align-items:center;justify-content:center;gap:3px;color:#fff;cursor:pointer;
  transition:background .18s, transform .18s;
}
.icon-btn:active{transform:scale(.94);background:rgba(255,255,255,.2)}
.star-btn{width:auto;padding:0 11px;font-size:12.5px;font-weight:700;color:var(--gold);
  background:rgba(240,176,60,.16)}
.search-bar{padding:10px 14px;background:#fff;border-bottom:1px solid var(--line)}
.search-bar input{
  width:100%;height:42px;border-radius:12px;border:1px solid var(--line-2);background:#F7F9FD;
  padding:0 14px;font-size:14px;color:var(--ink);outline:none;
}
.search-bar input:focus{border-color:var(--navy-3);background:#fff;box-shadow:0 0 0 3px rgba(27,75,176,.1)}

/* ---------------- 主体 ---------------- */
.app-main{
  padding:calc(56px + env(safe-area-inset-top) + 12px) 14px calc(var(--nav-h) + env(safe-area-inset-bottom) + 22px);
  max-width:720px;margin:0 auto;
}
.section-title{display:flex;align-items:baseline;gap:8px;margin:20px 2px 12px}
.section-title:first-child{margin-top:6px}
.section-title h2{font-size:17px;font-weight:800}

/* Hero */
.hero{
  position:relative;overflow:hidden;border-radius:var(--r-lg);padding:20px 18px 18px;
  background:linear-gradient(135deg,#081c4d,var(--navy) 55%,#17418f);
  box-shadow:var(--sh-2);margin-bottom:6px;
}
.hero h1{color:#fff;font-size:21px;font-weight:800;letter-spacing:.01em}
.hero .slogan{color:var(--gold);font-size:13.5px;font-weight:700;margin-top:5px;letter-spacing:.04em}
.hero .sub{color:rgba(255,255,255,.72);font-size:12.5px;margin-top:6px}
.hero .update-pill{
  display:inline-block;margin-top:12px;padding:6px 12px;border-radius:999px;
  background:rgba(255,255,255,.12);color:#fff;font-size:11.5px;border:1px solid rgba(255,255,255,.14);
}
.hero .update-pill b{color:var(--gold)}
.guitar-deco{position:absolute;right:-16px;top:-8px;width:110px;opacity:.16;pointer-events:none}

/* 筛选 */
.filters{display:flex;gap:7px;flex-wrap:wrap;margin:3px 0 9px}
.chip{
  padding:6px 13px;border-radius:999px;background:#EEF2FA;color:#54628a;font-size:12.5px;
  font-weight:600;cursor:pointer;transition:.16s;border:1px solid transparent;
}
.chip:active{transform:scale(.96)}
.chip.active{background:var(--navy);color:#fff;box-shadow:0 6px 14px -8px rgba(10,36,99,.9)}
.chip.gold.active{background:linear-gradient(135deg,var(--gold),#e09a24);color:#3b2a05}
.row-between{display:flex;align-items:center;justify-content:space-between;margin:8px 2px 12px}

/* 分段控件 */
.seg{display:flex;gap:4px;background:#EDF1F9;padding:4px;border-radius:14px;margin:4px 0 14px}
.seg-btn{
  flex:1;border:0;background:transparent;padding:9px 6px;border-radius:11px;font-size:13.5px;
  font-weight:700;color:#5b698f;cursor:pointer;transition:.18s;
}
.seg-btn.on{background:#fff;color:var(--navy);box-shadow:0 4px 12px -8px rgba(16,24,40,.5)}

/* 列表项 */
.item{
  display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-md);padding:11px 13px;margin-bottom:9px;cursor:pointer;
  box-shadow:var(--sh-1);transition:transform .16s, box-shadow .16s;
}
.item:active{transform:scale(.995);box-shadow:0 2px 6px rgba(16,24,40,.06)}
.thumb{
  width:44px;height:44px;flex:0 0 44px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,var(--navy),#2159c9);
}
.thumb svg{width:24px;height:24px}
.thumb.lv-thumb{background:linear-gradient(140deg,#0d2b74,#2a63d6)}
.lv-thumb span{color:#fff;font-weight:800;font-size:17px;line-height:1}
.lv-thumb.big{width:54px;height:54px;flex:0 0 54px;border-radius:16px}
.lv-thumb.big span{font-size:24px}
.item .body{flex:1;min-width:0}
.item .t{font-size:14.5px;font-weight:700;color:var(--ink);line-height:1.4}
.item .t .badge{margin-left:5px;vertical-align:middle}
.item .t .lv-note{font-weight:600;color:var(--muted);font-size:12px}
.item .s{font-size:12.5px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.item .meta-right{font-size:11.5px;color:var(--muted);text-align:right;flex:0 0 auto;line-height:1.35;
  max-width:64px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.empty{text-align:center;color:var(--muted);font-size:13px;padding:34px 12px;background:#fff;
  border:1px dashed var(--line-2);border-radius:var(--r-md)}

/* 徽章 */
.badge{font-size:11px;font-weight:700;padding:2px 8px;border-radius:8px;white-space:nowrap;border:1px solid transparent}
.badge.lv-low{background:var(--ok-soft);color:var(--ok);border-color:#c9ecdc}
.badge.lv-mid{background:var(--blue-soft);color:var(--blue);border-color:#d3e2fd}
.badge.lv-high{background:var(--gold-soft);color:var(--gold-deep);border-color:#f4e2bb}
.badge.lv-top{background:var(--danger-soft);color:var(--danger);border-color:#f8d7d5}

/* 详情 */
.back-bar{
  display:inline-flex;align-items:center;gap:5px;font-size:13.5px;font-weight:700;color:var(--navy);
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px 7px 10px;
  margin-bottom:14px;cursor:pointer;box-shadow:var(--sh-1);
}
.back-bar svg{width:16px;height:16px}
.detail-head{display:flex;gap:13px;align-items:center;margin-bottom:14px}
.detail-head h2{font-size:19px;font-weight:800}
.detail-head .artist{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.5}
.detail-head .artist .badge{margin-right:5px}
.big-thumb{width:54px;height:54px;flex:0 0 54px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,var(--navy),#2159c9);box-shadow:var(--sh-1)}
.big-thumb svg{width:28px;height:28px}
.info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 8px;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-md);padding:12px 14px;margin:12px 0 16px;box-shadow:var(--sh-1)}
.info-grid .k{font-size:11px;color:var(--faint);letter-spacing:.02em}
.info-grid .v{font-size:14px;font-weight:700;color:var(--navy);margin-top:1px}
.block{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:13px 14px;margin-bottom:12px;box-shadow:var(--sh-1)}
.block h3{font-size:13.5px;font-weight:800;margin-bottom:8px;color:var(--navy);display:flex;align-items:center;gap:6px}
.block h3::before{content:"";width:4px;height:14px;border-radius:2px;background:linear-gradient(var(--gold),#e09a24)}
.note-box{background:var(--gold-soft);border:1px solid #f6e6c4;border-radius:var(--r-sm);padding:10px 12px;font-size:13px;color:#6b5216;line-height:1.65}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);padding:6px 4px;margin-bottom:12px;box-shadow:var(--sh-1)}
.card .block{border:0;box-shadow:none;margin:0}
.num-list{margin:0;padding-left:19px;font-size:13.5px;color:var(--body);line-height:1.75}
.num-list li{margin-bottom:3px}
.step{display:flex;gap:10px;padding:7px 0;border-bottom:1px dashed var(--line)}
.step:last-child{border-bottom:0}
.step .time{flex:0 0 62px;font-size:12px;font-weight:800;color:var(--gold-deep)}
.step .sd{font-size:13px;color:var(--body)}
.link-ref{color:var(--navy);font-weight:700;border-bottom:1px dashed var(--navy-3);cursor:pointer}
.chord-row{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0}
.chord-pill{background:#EEF2FB;color:var(--navy);font-weight:700;border-radius:9px;padding:4px 11px;font-size:13px;border:1px solid #e0e7f7}
.sec-label{font-size:12px;font-weight:700;color:var(--muted);margin:8px 0 3px}

/* 谱面 */
.tab-wrap{background:#fff;border:1px solid #E3E9F6;border-radius:var(--r-md);padding:12px 10px;overflow-x:auto;
  -webkit-overflow-scrolling:touch}
.tab-wrap svg{display:block;width:100%;height:auto}
.tab-wrap text{user-select:none}
pre.tab{background:#F7F9FD;border:1px solid var(--line);border-radius:var(--r-sm);padding:10px;font-size:12px;
  overflow-x:auto;color:var(--body);margin:0}
.sub-block{margin:14px 0 18px}
.sub-block .sub-t{font-weight:800;color:var(--navy);font-size:13.5px;margin-bottom:7px}
.focus-item{border-left:3px solid var(--gold);background:#FBFCFE;border-radius:0 12px 12px 0;padding:9px 12px;margin:9px 0;
  border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.focus-item .ft{font-weight:800;color:var(--navy);font-size:14px}
.focus-item .fm{font-size:11.5px;color:var(--gold-deep);margin:3px 0 5px}
.focus-item .fd{font-size:13px;color:var(--body);line-height:1.65}
.song-chips{display:flex;flex-wrap:wrap;gap:6px}
.song-chip{background:#EEF2FB;color:var(--navy);border-radius:999px;padding:5px 12px;font-size:12.5px;font-weight:600;border:1px solid #e2e8f6}
.song-chip.link{background:linear-gradient(135deg,var(--navy),#1c4ba6);color:#fff;border-color:transparent;cursor:pointer;
  box-shadow:0 8px 18px -12px rgba(10,36,99,.95)}

/* 我的进度 */
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:14px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:12px 14px;box-shadow:var(--sh-1)}
.stat .num{font-size:22px;font-weight:800;color:var(--navy);line-height:1.1}
.stat .lab{font-size:11.5px;color:var(--muted);margin-top:2px}
.star-wall{display:flex;flex-wrap:wrap;gap:2px;max-height:112px;overflow:hidden}
.star-wall .s{color:#E2E7F1;font-size:14px}
.star-wall .s.on{color:var(--gold)}
.log-item{font-size:12.5px;color:var(--body);padding:7px 0;border-bottom:1px dashed var(--line);line-height:1.6}
.log-item:last-child{border-bottom:0}
.log-item .ld{display:inline-block;font-weight:800;color:var(--navy);margin-right:7px;font-size:11.5px}

/* 自检报告 */
.sc-report{margin-top:12px;border:1px solid var(--line);border-radius:var(--r-sm);padding:11px 12px;background:#FBFCFE}
.sc-time{font-size:11.5px;color:var(--faint);margin-bottom:7px}
.sc-line{font-size:12.5px;line-height:1.7;color:var(--body)}
.sc-line.ok{color:#1c7a56}.sc-line.warn{color:var(--warn)}.sc-line.fail{color:var(--danger);font-weight:700}
.sc-sum{margin-top:9px;font-size:13px;font-weight:800;color:var(--navy)}

/* 工具页 */
.tool-card h3{margin-top:0}
.tuner-strings{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin:10px 0}
.string-btn{background:#EEF2FB;border-radius:12px;text-align:center;padding:9px 0;font-size:15px;font-weight:800;color:var(--navy);cursor:pointer;border:1px solid #e2e8f6}
.string-btn small{display:block;font-size:9.5px;color:var(--muted);font-weight:600}
.tuner-readout{margin:12px 0 6px;text-align:center}
.tuner-note{font-size:30px;font-weight:800;color:var(--navy);line-height:1}
.tuner-cents{font-size:12.5px;color:var(--muted);margin-top:3px}
.tuner-needle{position:relative;height:9px;background:#EDF1F9;border-radius:999px;margin:12px 0}
.tuner-needle .ind{position:absolute;top:-3px;width:3px;height:15px;border-radius:2px;background:var(--gold);transition:left .12s}
.tuner-status{font-size:12.5px;color:var(--muted);margin-top:6px}
.metronome-bpm{font-size:34px;font-weight:800;color:var(--navy);text-align:center;line-height:1}
.bpm-range{width:100%;margin:12px 0 6px;accent-color:var(--navy)}
.toggle-group{display:flex;gap:7px;justify-content:center;margin:8px 0}
.beat-dots{display:flex;gap:9px;justify-content:center;margin:12px 0}
.beat-dot{width:11px;height:11px;border-radius:50%;background:#E3E8F3}
.beat-dot.accent{background:#C9D3E8}
.beat-dot.on{background:var(--gold);transform:scale(1.28)}
.controls{display:flex;justify-content:center;margin-top:6px}

/* 按钮 */
.btn{
  width:100%;border:0;border-radius:14px;padding:13px 16px;font-size:14.5px;font-weight:800;cursor:pointer;
  background:linear-gradient(135deg,var(--navy),#1c4ba6);color:#fff;box-shadow:0 12px 24px -16px rgba(10,36,99,.95);
  transition:transform .16s, filter .16s;
}
.btn:active{transform:scale(.985);filter:brightness(1.05)}
.btn.gold{background:linear-gradient(135deg,var(--gold),#e09a24);color:#3b2a05;box-shadow:0 12px 24px -16px rgba(224,154,36,.95)}
.btn.done{background:var(--ok-soft);color:var(--ok);box-shadow:none;border:1px solid #c9ecdc}
.btn.ghost{background:#fff;color:var(--navy);border:1px solid var(--line-2);box-shadow:var(--sh-1)}

/* 底部导航（悬浮胶囊） */
.bottom-nav{
  position:fixed;left:12px;right:12px;bottom:calc(env(safe-area-inset-bottom) + 8px);z-index:60;
  height:var(--nav-h);display:flex;align-items:center;justify-content:space-around;
  background:rgba(255,255,255,.94);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(232,236,245,.9);border-radius:22px;box-shadow:0 18px 40px -20px rgba(10,36,99,.5);
  max-width:708px;margin:0 auto;padding:0 4px;
}
.nav-item{
  flex:1;border:0;background:transparent;display:flex;flex-direction:column;align-items:center;gap:1px;
  padding:6px 0;font-size:10.5px;color:var(--muted);font-weight:700;cursor:pointer;border-radius:16px;transition:.18s;
}
.nav-item .nav-ico{font-size:19px;line-height:1.15;filter:grayscale(.35);transition:.18s}
.nav-item.active{color:var(--navy)}
.nav-item.active .nav-ico{filter:none;transform:translateY(-1px) scale(1.06)}
.brand-foot{text-align:center;font-size:11.5px;color:var(--faint);margin:22px 0 6px;line-height:1.9}

@media(min-width:560px){
  .info-grid{grid-template-columns:repeat(4,1fr)}
  .stat-grid{grid-template-columns:repeat(4,1fr)}
}

/* ---------- 训练 / 乐理 / 教学步骤（training.js） ---------- */
.kid-card{background:linear-gradient(135deg,#0e2c74,#1c4ba6);border-radius:var(--r-md);padding:14px 15px;margin-bottom:12px;box-shadow:var(--sh-2)}
.kid-card .kc-t{color:#fff;font-weight:800;font-size:15px}
.kid-card .kc-s{color:rgba(255,255,255,.86);font-size:13px;margin-top:5px;line-height:1.65}
.kid-card .kc-no{margin-top:9px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.18);border-radius:10px;
  padding:8px 10px;color:#ffe6b8;font-size:12.5px;line-height:1.6}
.block .kc-no{background:var(--danger-soft);border:1px solid #f8d7d5;border-radius:10px;padding:8px 10px;color:#a53c38;font-size:12.5px;line-height:1.6}
.kid-line{font-size:13.5px;color:var(--body);line-height:1.7;background:#F7F9FD;border-radius:10px;padding:9px 11px}
.kid-line.act{background:var(--gold-soft);border:1px solid #f6e6c4;color:#6b5216;margin-top:8px}
.cat-thumb{width:44px;height:44px;flex:0 0 44px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,#123a8f,#2a63d6);color:#fff;font-size:10.5px;font-weight:800;line-height:1.15;text-align:center;padding:2px}
.cat-thumb.big{width:54px;height:54px;flex:0 0 54px;font-size:12px;border-radius:16px}
.flow-step{display:flex;gap:10px;padding:9px 0;border-bottom:1px dashed var(--line)}
.flow-step:last-child{border-bottom:0}
.fs-idx{flex:0 0 24px;height:24px;border-radius:50%;background:linear-gradient(135deg,var(--navy),#1c4ba6);color:#fff;
  font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center}
.fs-body{flex:1}
.fs-t{font-size:13.5px;font-weight:800;color:var(--navy)}
.fs-min{font-size:11px;font-weight:700;color:var(--gold-deep);background:var(--gold-soft);border-radius:7px;padding:1px 7px;margin-left:5px}
.fs-w{font-size:12.5px;color:var(--body);line-height:1.65;margin-top:2px}
.link-list{display:flex;flex-direction:column;gap:7px}
.link-item{display:block;text-decoration:none;background:#EEF2FB;border:1px solid #e2e8f6;border-radius:12px;
  padding:10px 12px;font-size:13px;font-weight:600;color:var(--navy)}
.link-item:active{background:#E3EAF8}

/* ---------- 云同步 / 登录表单 / 课堂记录 ---------- */
.form-row{margin:10px 0}
.form-row label{display:block;font-size:12px;font-weight:700;color:var(--muted);margin-bottom:5px}
.form-row input,.form-row select,.form-row textarea{width:100%;border:1px solid var(--line-2);background:#F7F9FD;
  border-radius:12px;padding:11px 12px;font-size:14px;color:var(--ink);outline:none}
.form-row textarea{min-height:88px;resize:vertical;line-height:1.6}
.form-row input:focus,.form-row textarea:focus{border-color:var(--navy-3);background:#fff;box-shadow:0 0 0 3px rgba(27,75,176,.1)}
.btn-row{display:flex;gap:8px;margin-top:10px}
.btn-row .btn{margin:0}
.sync-line{margin-top:9px;font-size:12.5px;color:var(--muted);background:#F7F9FD;border-radius:10px;padding:8px 10px;line-height:1.6}
.sync-line.ok{background:var(--ok-soft);color:#1c7a56;border:1px solid #c9ecdc}
.sync-line.fail{background:var(--danger-soft);color:#a53c38;border:1px solid #f8d7d5}
.note-form{margin-top:4px}
.note-form input,.note-form select,.note-form textarea{width:100%;border:1px solid var(--line-2);background:#F7F9FD;
  border-radius:12px;padding:10px 12px;font-size:13.5px;color:var(--ink);outline:none;margin-bottom:8px}
.note-form textarea{min-height:76px;resize:vertical;line-height:1.6}
.note-form select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,#8b97b8 50%),linear-gradient(135deg,#8b97b8 50%,transparent 50%);
  background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat}
.note-list{margin-top:10px}
.note-item{border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin-bottom:8px;background:#FBFCFE}
.ni-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ni-head b{font-size:13.5px;color:var(--navy)}
.ni-del{margin-left:auto;font-size:11.5px;color:var(--danger);font-weight:700;cursor:pointer;
  border:1px solid #f8d7d5;background:#fff;border-radius:8px;padding:2px 9px}
.ni-body{font-size:13px;color:var(--body);line-height:1.65;margin-top:5px;white-space:pre-wrap}

/* ---------- 完整谱：和弦歌词谱 / 段落结构 / 节奏型 ---------- */
.cl-meta{font-size:12px;color:var(--muted);margin-bottom:9px}
.cl-sec{display:inline-block;font-size:11.5px;font-weight:800;color:var(--navy);background:#EEF2FB;
  border-radius:8px;padding:2px 9px;margin:8px 0 6px}
.cl-line{display:flex;flex-wrap:wrap;align-items:flex-end;line-height:1.25;margin:2px 0 10px}
.cl-pair{display:inline-flex;flex-direction:column;align-items:flex-start;margin-right:2px}
.cl-c{font-size:12px;font-weight:800;color:var(--gold-deep);line-height:1.3;min-height:15px;white-space:nowrap}
.cl-t{font-size:15px;color:var(--ink);line-height:1.5;white-space:pre}
.cl-strum{margin-top:10px;background:var(--gold-soft);border:1px solid #f6e6c4;border-radius:10px;
  padding:8px 11px;font-size:12.5px;color:#6b5216;line-height:1.6}
.struct-list{display:flex;flex-direction:column;gap:7px}
.struct-row{display:flex;gap:9px;align-items:flex-start;background:#FBFCFE;border:1px solid var(--line);
  border-radius:12px;padding:9px 11px}
.st-sec{flex:0 0 66px;font-size:12.5px;font-weight:800;color:var(--navy)}
.st-bars{flex:0 0 52px;font-size:11.5px;color:var(--gold-deep);font-weight:700}
.st-note{font-size:12.5px;color:var(--body);line-height:1.6}
.st-chords{display:block;margin-top:3px;font-size:12px;font-weight:700;color:var(--navy)}
.rhythm-wrap{background:#FBFCFE;border:1px solid var(--line);border-radius:var(--r-md);padding:8px 8px 4px}
.rhythm-legend{font-size:11px;color:var(--muted);text-align:center;padding:0 0 6px}
/* 和弦图注：朝向说明 */
.tab-wrap + .muted{margin-top:6px}

/* ---------- 融合课程体系：四模块网格 ---------- */
.mod-grid{display:grid;grid-template-columns:1fr;gap:8px;margin-top:4px}
.mod{background:#FBFCFE;border:1px solid var(--line);border-left:3px solid var(--navy);border-radius:0 12px 12px 0;padding:9px 11px}
.mod .mod-t{font-size:12.5px;font-weight:800;color:var(--navy)}
.mod .mod-b{font-size:12.5px;color:var(--body);line-height:1.6;margin-top:2px}
@media(min-width:560px){.mod-grid{grid-template-columns:repeat(2,1fr)}}

/* ---------- 标准组合谱（score-render.js） ---------- */
.cs-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;background:#fff;border:1px solid #e2e8f6;border-radius:12px;padding:8px 6px}
.cs-sys{margin:2px 0}
.cs-sys svg{display:block}
.cs-head{padding:2px 4px 8px}
.cs-title{font-size:15.5px;font-weight:800;color:var(--navy,#0A2463)}
.cs-meta{font-size:11.5px;color:#8a6a1f;background:var(--gold-soft,#f9eed6);border-radius:8px;padding:4px 9px;margin-top:6px;display:inline-block}
.cs-legend{font-size:11px;color:#7b87a8;line-height:1.65;margin-top:6px}
.cs-notes{margin-top:10px;display:flex;flex-direction:column;gap:7px}
.cs-note{font-size:12.5px;color:#3a4560;line-height:1.65;background:#F7F9FD;border-left:3px solid #F0B03C;border-radius:0 10px 10px 0;padding:8px 11px}
.csn-t{font-weight:800;color:var(--navy,#0A2463);margin-right:6px}
.badge.std{background:#f9eed6;color:#8a6a1f;border:1px solid #ecd9ad}

/* ---------- 横屏看谱 ---------- */
.score-block .score-hd{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px}
.score-block .score-hd h3{margin:0}
.ls-btn{flex:0 0 auto;border:1px solid var(--navy);color:var(--navy);background:#EEF2FB;border-radius:999px;
  padding:5px 12px;font-size:12px;font-weight:700;cursor:pointer}
.ls-btn:active{background:#E3EAF8}
.ls-overlay{display:none}
.ls-overlay.on{display:block;position:fixed;inset:0;z-index:999;background:#101c3d}
.ls-top{position:fixed;top:0;left:0;right:0;height:44px;display:flex;align-items:center;gap:10px;
  padding:0 12px;background:rgba(10,36,99,.92);backdrop-filter:blur(6px);z-index:2}
.ls-top .ls-btn{border-color:#fff;color:#fff;background:rgba(255,255,255,.12)}
.ls-tip{color:rgba(255,255,255,.85);font-size:12px}
.ls-inner{position:absolute;top:0;left:100%;width:100vh;height:100vw;
  transform:rotate(90deg);transform-origin:0 0;overflow-y:auto;background:#f4f6fb;padding:52px 10px 20px;
  -webkit-overflow-scrolling:touch}
.ls-inner .cs-wrap{background:#fff;max-width:1150px;margin:0 auto}

/* ---------- 级别主导布局（左侧级别导航 + 右侧上课流程模块） ---------- */
/* ---------- 三栏导航（全端通用）：手机紧凑列，平板/宽屏加宽 ----------
   手机也保持「左级别 / 中课时 / 右内容」三栏，列宽用 media 阶梯放大 */
.lv-layout{display:flex;align-items:flex-start;gap:8px}
.lv-layout.cols3{display:grid;grid-template-columns:50px 140px minmax(0,1fr);gap:8px;align-items:start}
.lv-nav{position:sticky;top:calc(56px + env(safe-area-inset-top) + 4px);z-index:30;
  display:flex;flex-direction:column;gap:4px;max-height:calc(100vh - 70px);overflow-y:auto;
  flex:0 0 50px}
.ls-nav{position:sticky;top:calc(56px + env(safe-area-inset-top) + 4px);z-index:30;
  display:flex;flex-direction:column;gap:4px;max-height:calc(100vh - 70px);overflow-y:auto;
  flex:0 0 140px;padding-right:1px}
/* 第二列：课时列表导航 */
.ls-nav-hd{font-size:12.5px;font-weight:800;color:var(--navy);padding:2px 4px 4px;
  display:flex;align-items:baseline;gap:6px;position:sticky;top:0;background:rgba(244,246,251,.96);backdrop-filter:blur(6px);z-index:2}
.ls-btn{display:flex;align-items:flex-start;gap:8px;text-align:left;border:1px solid #dfe6f5;background:#fff;border-radius:12px;
  padding:8px 9px;cursor:pointer;transition:.15s}
.ls-btn:hover{border-color:#b9c8ea}
.ls-btn.on{background:var(--navy);border-color:var(--navy);box-shadow:var(--sh-2)}
.ls-btn.on .ls-b{color:#fff}
.ls-btn.on .ls-b em{color:rgba(255,255,255,.78)}
.ls-n{flex:0 0 22px;height:22px;border-radius:8px;background:#eef2fb;color:var(--navy);font-weight:800;font-size:12px;
  display:flex;align-items:center;justify-content:center;margin-top:1px}
.ls-btn.on .ls-n{background:rgba(255,255,255,.18);color:#fff}
.ls-b{flex:1;min-width:0;font-weight:800;font-size:12.5px;color:var(--navy);line-height:1.35;position:relative;padding-right:14px}
.ls-b em{display:block;font-style:normal;font-weight:600;font-size:10.5px;color:#7c8aa5;margin-top:2px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ls-done{position:absolute;right:0;top:1px;color:#1c9e6a;font-size:12px}
.ls-btn.on .ls-done{color:#ffe6b8}
/* 单课底部翻页 */
.lesson-pager{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:16px}
/* ---------- 上课流程条（五环节 = 真实上课顺序） ---------- */
.flow-bar{display:flex;gap:6px;margin-bottom:12px;overflow-x:auto}
.flow-step{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;border:1px solid #e3e9f6;background:#fff;
  border-radius:12px;padding:8px 6px;cursor:pointer;white-space:nowrap;min-width:74px;transition:.15s}
.flow-step:hover{border-color:#b9c8ea}
.flow-step.on{background:linear-gradient(135deg,#0e2c74,#1c4ba6);border-color:#0e2c74;box-shadow:var(--sh-2)}
.flow-step.on .fw-t{color:#fff}
.flow-step.on .fw-m{color:#ffe6b8}
.flow-step.on .fw-i{background:rgba(255,255,255,.2);color:#fff}
.fw-i{width:17px;height:17px;border-radius:50%;background:#eef2fb;color:var(--navy);font-size:10.5px;font-weight:800;
  display:flex;align-items:center;justify-content:center;flex:0 0 17px}
.fw-t{font-size:12.5px;font-weight:800;color:var(--navy)}
.fw-m{font-size:10.5px;color:#8b98b0;font-weight:700}
/* ---------- 练法卡 / 递进台阶 / 热身 ---------- */
.rx-steps{margin-top:8px;background:#f6f8fd;border:1px solid #e6ecf8;border-radius:12px;padding:10px 12px}
.rx-steps>b{display:block;font-size:12px;color:var(--navy);margin-bottom:6px}
.rx-li{display:flex;gap:7px;align-items:flex-start;font-size:12.5px;line-height:1.55;color:#33415e;padding:2.5px 0}
.rx-k{flex:0 0 17px;height:17px;border-radius:6px;background:var(--navy);color:#fff;font-size:10.5px;font-weight:800;
  display:flex;align-items:center;justify-content:center;margin-top:2px}
.rx-row{padding:7px 0;border-top:1px dashed #e3e9f6}
.rx-row:first-of-type{border-top:0}
.rx-row b{color:var(--navy);font-size:13px}
.rx-sub{font-size:12px;color:#5c6b87;margin-top:2px}
.warm-block{background:linear-gradient(135deg,#fffdf6,#fff8e8);border:1px solid #f0e3c0}
/* ---------- 乐理小测 ---------- */
.quiz-line{margin-top:8px;background:#f4f7ff;border-left:3px solid #2f66d0;border-radius:0 10px 10px 0;
  padding:8px 10px;font-size:12.5px;line-height:1.55;color:#2c3a57}
/* ---------- 自查清单 / 下节课预告 ---------- */
.check-row{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-top:1px dashed #e8edf7}
.check-row:first-of-type{border-top:0}
.ck-b{flex:0 0 44px;text-align:center;background:var(--gold-soft);border:1px solid #e6c87c;color:#6b5216;
  border-radius:9px;font-weight:800;font-size:12px;padding:4px 0;margin-top:1px}
.check-row b{color:var(--navy);font-size:13px}
.preview-card{margin-top:14px;border:1.5px dashed #b9c8ea;border-radius:16px;padding:14px;background:#fbfcff}
.pv-t{font-size:11.5px;font-weight:800;color:#5c7bd0;letter-spacing:.05em}
.pv-b{font-size:15px;font-weight:800;color:var(--navy);margin-top:3px}
.pv-s{font-size:12px;color:#7c8aa5;margin-top:2px}
.item.song-rx{border-bottom-left-radius:0;border-bottom-right-radius:0;margin-bottom:0}
.item.song-rx + .rx-steps{border-top-left-radius:0;border-top-right-radius:0;margin-top:0;margin-bottom:12px;border-top:0}
/* ---------- 本地资料库 ---------- */
.lib-item{background:#fbfcff}
.lib-thumb{display:flex;align-items:center;justify-content:center;font-size:20px;background:#eef3fd}
/* ---------- 节拍器 ± 精确调节 ---------- */
.bpm-ctrl{display:flex;align-items:center;justify-content:center;gap:18px;margin-bottom:4px}
.bpm-btn{width:46px;height:46px;border-radius:50%;border:1.5px solid #dfe6f5;background:#fff;font-size:24px;font-weight:800;
  color:var(--navy);cursor:pointer;line-height:1;transition:.15s}
.bpm-btn:hover{border-color:var(--navy);background:#eef2fb}
.bpm-btn:active{transform:scale(.92)}
/* ---------- 展开精讲（默认收纳，页面更清爽） ---------- */
details.deep{margin-top:7px}
details.deep summary{cursor:pointer;font-size:12px;font-weight:700;color:#5c7bd0;list-style:none;user-select:none}
details.deep summary::-webkit-details-marker{display:none}
details.deep summary::before{content:"＋ "}
details.deep[open] summary::before{content:"− "}
details.deep[open] summary{margin-bottom:5px}
/* ---------- 调音器精准反馈 ---------- */
.tuner-note.good{color:#1c9e6a}
.string-btn.near{border-color:var(--navy);background:#eef3fd;box-shadow:var(--sh-2)}
/* ---------- 打印本课 / 谱面小按钮 ---------- */
.print-bar{display:flex;justify-content:flex-end;margin:-4px 0 8px}
.btn.tiny{padding:4px 10px;font-size:11.5px;margin-left:8px;border-radius:8px}
.btn.tiny.done{background:#e8f5ef;border-color:#bfe3d2;color:#1c9e6a}
.lv-btn{display:flex;align-items:center;gap:7px;border:1px solid #dfe6f5;background:#fff;border-radius:12px;
  padding:8px 10px;font-weight:800;font-size:13px;color:var(--navy);cursor:pointer}
.lv-btn.on{background:var(--navy);color:#fff;border-color:var(--navy);box-shadow:var(--sh-2)}
.lv-btn .lv-n{font-size:14px;width:16px;text-align:center}
.lv-btn .lv-done{margin-left:auto;color:#1c9e6a;font-size:12px}
.lv-btn.on .lv-done{color:#ffe6b8}
.lv-main{flex:1;min-width:0}
.lv-head{display:flex;gap:12px;background:linear-gradient(135deg,#0e2c74,#1c4ba6);border-radius:16px;padding:14px;color:#fff;margin-bottom:10px;box-shadow:var(--sh-2)}
.lv-head-num{flex:0 0 52px;height:52px;border-radius:14px;background:rgba(255,255,255,.16);display:flex;align-items:center;justify-content:center;font-size:26px;font-weight:800}
.lv-head-t h2{margin:0;font-size:16.5px;color:#fff}
.lv-head-t .s{font-size:12.5px;color:rgba(255,255,255,.88);margin-top:3px;line-height:1.5}
.mod-tabs{display:flex;gap:6px;margin-bottom:12px}
.mod-tab{flex:1;display:flex;align-items:center;justify-content:center;gap:5px;border:1px solid #dfe6f5;background:#fff;
  border-radius:999px;padding:8px 4px;font-size:12.5px;font-weight:700;color:var(--navy);cursor:pointer;white-space:nowrap}
.mod-tab.on{background:var(--gold-soft);border-color:#e6c87c;color:#6b5216}
.mod-tab .mt-i{width:16px;height:16px;border-radius:50%;background:var(--navy);color:#fff;font-size:10.5px;
  display:flex;align-items:center;justify-content:center;flex:0 0 16px}
.mod-tab.on .mt-i{background:#a9701a}
/* ---------- 手机（≤699px）：三栏紧凑版 ---------- */
@media(max-width:699px){
  .app-main{padding-left:8px;padding-right:8px}
  .lv-layout{gap:6px}
  .lv-layout.cols3{grid-template-columns:46px 128px minmax(0,1fr);gap:6px}
  .lv-btn{padding:7px 4px;font-size:11.5px;gap:0;justify-content:center;border-radius:10px}
  .lv-btn .lv-n{display:none}
  .lv-done{display:none}
  .ls-nav-hd{font-size:11px;padding:2px 2px 3px}
  .ls-btn{padding:6px 6px;border-radius:10px;gap:5px}
  .ls-n{flex:0 0 17px;height:17px;font-size:10px;border-radius:6px}
  .ls-b{font-size:11px;padding-right:11px}
  .ls-b em{font-size:9.5px;-webkit-line-clamp:2;display:-webkit-box;-webkit-box-orient:vertical}
  .lv-head{padding:11px;border-radius:14px;gap:10px}
  .lv-head-num{flex:0 0 42px;height:42px;font-size:21px;border-radius:12px}
  .lv-head-t h2{font-size:15px}
  .lv-head-t .s{font-size:11.5px}
  .flow-bar{flex-wrap:wrap;overflow:visible}
  .flow-step{flex:1 1 30%;min-width:0;padding:7px 3px;gap:4px}
  .fw-t{font-size:11px}
  .fw-m{font-size:9px}
  .fw-i{width:15px;height:15px;flex:0 0 15px;font-size:9.5px}
  .mod-tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:4px;overflow:visible}
  .mod-tab{padding:7px 3px;font-size:11px;gap:3px}
  .mod-tab .mt-i{width:14px;height:14px;flex:0 0 14px;font-size:9.5px}
}
/* ---------- 平板/中屏（700–999px）：标准三栏 ---------- */
@media(min-width:700px) and (max-width:999px){
  .lv-layout.cols3{grid-template-columns:78px 196px minmax(0,1fr);gap:10px}
  .ls-nav{flex:0 0 196px}
  .lv-nav{flex:0 0 78px}
}
/* ---------- 平板横屏/宽屏（≥1000px）：加宽主容器 ---------- */
@media(min-width:1000px){
  .app-main{max-width:1280px;padding-left:22px;padding-right:22px}
  .lv-layout.cols3{grid-template-columns:84px 218px minmax(0,1fr);gap:14px}
  .bottom-nav{max-width:900px}
}

/* ---------- 底部全局工具栏 ---------- */
.tool-bar{position:fixed;left:0;right:0;bottom:0;display:flex;background:#fff;border-top:1px solid #dfe6f5;
  padding:6px 10px calc(6px + env(safe-area-inset-bottom));z-index:60;box-shadow:0 -4px 16px rgba(10,36,99,.06)}
.tb-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;background:none;border:0;
  font-size:11px;font-weight:700;color:var(--navy);cursor:pointer;padding:4px 0}
.tb-ico{font-size:18px;line-height:1}
.tb-item:active{opacity:.7}

/* ---------- 底部弹层（搜索 / 工具 / 进度） ---------- */
.ov{position:fixed;inset:0;z-index:200;background:rgba(13,22,48,.55);display:flex;align-items:flex-end;justify-content:center}
.ov-panel{width:100%;max-width:640px;max-height:86vh;display:flex;flex-direction:column;background:#fff;
  border-radius:18px 18px 0 0;overflow:hidden;box-shadow:0 -8px 30px rgba(10,36,99,.25)}
.ov-hd{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;background:var(--navy);color:#fff;flex:0 0 auto}
.ov-hd b{font-size:14.5px}
.ov-hd .icon-btn{background:rgba(255,255,255,.14);border-radius:50%;width:30px;height:30px;display:flex;align-items:center;justify-content:center;color:#fff;border:0;font-size:14px;cursor:pointer}
.ov-body{overflow-y:auto;padding:12px 14px calc(24px + env(safe-area-inset-bottom));-webkit-overflow-scrolling:touch}

/* ---------- 访问口令登录页 ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 18px;
  background:linear-gradient(160deg,#0A2463 0%,#123a8f 60%,#1c4ba6 100%)}
.login-card{width:100%;max-width:360px;background:#fff;border-radius:20px;padding:22px 18px 18px;box-shadow:0 18px 50px rgba(6,20,55,.35);text-align:center}
.login-logo{height:64px;width:auto;margin:0 auto 12px;display:block;filter:none;border-radius:14px}
.login-title{font-size:16px;font-weight:800;color:var(--navy)}
.login-sub{font-size:12.5px;color:var(--muted);margin:4px 0 14px}
.login-card .form-row{text-align:left}
.login-card .btn{width:100%;margin-top:6px}
.remember-row{display:flex;align-items:center;gap:6px;font-size:12.5px;color:#5a6784;margin:2px 0 10px;text-align:left}
.remember-row input{width:auto}
.login-foot{margin-top:14px;font-size:12px;color:var(--gold-deep,#a9701a);font-weight:700}
.btn.danger{background:#fdeceb;color:#a53c38;border:1px solid #f6d3d0}
.btn.ghost{background:#EEF2FB;color:var(--navy);border:1px solid #dfe6f5}

/* ---------- 未登录：只显示登录卡 ---------- */
body.gated .tool-bar{display:none}
body.gated .header-actions{display:none}
body.gated .app-header{background:#0A2463}

/* 未登录时隐藏底部工具栏与头部按钮（:has 方案，纯 CSS 即可生效，兼容 Chromium 105+） */
body:has(.login-card) .tool-bar{display:none}
body:has(.login-card) .header-actions{display:none}

/* ---------- 「安装到桌面」引导横幅 ---------- */
body.has-inst-banner{padding-top:46px}
.install-banner{position:fixed;left:0;right:0;top:0;z-index:300;display:flex;align-items:center;gap:8px;
  padding:9px 12px calc(9px);background:linear-gradient(135deg,#0e2c74,#1c4ba6);color:#fff;
  font-size:12.5px;box-shadow:0 4px 14px rgba(10,36,99,.25)}
.install-banner .ib-txt{flex:1;line-height:1.4;color:#fff}
.install-banner .ib-go{flex:0 0 auto;background:#F0B03C;color:#3a2a05;border:0;border-radius:999px;
  padding:6px 14px;font-size:12.5px;font-weight:800;cursor:pointer}
.install-banner .ib-x{flex:0 0 auto;background:rgba(255,255,255,.18);color:#fff;border:0;border-radius:50%;
  width:24px;height:24px;font-size:14px;line-height:1;cursor:pointer}

/* ============================================================
   v3 · Visual Refresh「Midnight & Gold」（DesignMdArchitect）
   设计原则：只动 色彩/渐变/光影/质感 —— 尺寸、栅格、断点全部沿用，
   手机紧凑规则不受影响；三栏逻辑目录与信息架构 100% 保持。
   ============================================================ */
:root{
  --bg-a:#F7F8FC; --bg-b:#F0F3FA;
  --aurora:linear-gradient(118deg,#071838 0%,#0A2463 38%,#1B49B8 78%,#3B6FE0 100%);
  --line:#E9EDF6; --line-2:#DFE5F2;
  --sh-1:0 1px 2px rgba(16,24,40,.03), 0 8px 22px -16px rgba(16,24,40,.20);
  --sh-2:0 2px 6px rgba(10,36,99,.06), 0 20px 44px -24px rgba(10,36,99,.38);
}
body{background:linear-gradient(180deg,var(--bg-a),var(--bg-b) 42%,var(--bg-a)) fixed}

/* ---- 顶栏：午夜渐变 + 星光金线 ---- */
.app-header{background:linear-gradient(118deg,#050F2B 0%,#0A2463 46%,#1B49B8 100%)}
.app-header::after{height:2px;background:linear-gradient(90deg,transparent 6%,rgba(240,176,60,.9) 50%,transparent 94%)}

/* ---- 章节标题：金色菱形标（新颖记忆点） ---- */
.section-title h2{display:flex;align-items:center;gap:8px}
.section-title h2::before{content:"";width:7px;height:7px;flex:0 0 7px;border-radius:2px;
  background:linear-gradient(135deg,var(--gold),#e09a24);transform:rotate(45deg)}

/* ---- 卡片/列表：干净表面 + 悬浮微抬 ---- */
.block,.card,.item,.tab-wrap,.preview-card,.rx-steps,.note-box{border-radius:14px}
.item{transition:transform .16s,box-shadow .16s,border-color .16s}
.item:hover{transform:translateY(-2px);border-color:#C9D6F0;box-shadow:0 14px 30px -18px rgba(10,36,99,.45)}
.note-box{box-shadow:inset 3px 0 0 var(--gold);border-radius:2px 12px 12px 2px}

/* ---- 第一列：级别导航（选中午夜渐变，悬浮微抬） ---- */
.lv-btn{transition:.16s}
.lv-btn:hover{border-color:#B9C8EA;transform:translateY(-1px)}
.lv-btn.on{background:linear-gradient(135deg,#0A2463,#1B49B8);border-color:transparent}

/* ---- 第二列：课时列表（选中渐变 + 金色左标，inset 不占位） ---- */
.ls-btn{transition:.16s}
.ls-btn:hover{transform:translateY(-1px)}
.ls-btn.on{background:linear-gradient(135deg,#0A2463,#1B49B8);border-color:transparent;
  box-shadow:inset 3px 0 0 var(--gold),var(--sh-2)}

/* ---- 单课页头：极光渐变 + 辉光 + 金环数字 ---- */
.lv-head{background:linear-gradient(118deg,#071838 0%,#0A2463 44%,#1E4FC2 100%);position:relative;overflow:hidden}
.lv-head::before{content:"";position:absolute;right:-46px;top:-64px;width:230px;height:230px;border-radius:50%;
  background:radial-gradient(circle,rgba(59,111,224,.5),transparent 65%);pointer-events:none}
.lv-head::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(240,176,60,.75),transparent)}
.lv-head-num{background:rgba(255,255,255,.14);box-shadow:inset 0 0 0 2px rgba(240,176,60,.55)}

/* ---- 流程条：选中段午夜渐变 ---- */
.flow-step.on{background:linear-gradient(135deg,#0A2463,#1E4FC2);border-color:transparent}

/* ---- 模块标签：白卡 + 金色下划签（新颖但不花哨） ---- */
.mod-tab{transition:.16s}
.mod-tab.on{background:#fff;border-color:#EBD9AC;box-shadow:inset 0 -2.5px 0 var(--gold),0 8px 18px -12px rgba(10,36,99,.35);color:var(--navy)}
.mod-tab.on .mt-i{background:linear-gradient(135deg,var(--gold),#e09a24)}

/* ---- 主按钮：更挺拔的金 ---- */
.btn.gold{background:linear-gradient(160deg,#F6BE54,var(--gold) 45%,#DE9520);box-shadow:0 14px 28px -16px rgba(224,154,36,.9)}
.btn{transition:.16s}
.btn:hover{filter:brightness(1.03)}

/* ---- 六线谱纸面：柔和纸感 ---- */
.tab-wrap{border-color:#E6EBF7;background:linear-gradient(180deg,#FFFFFF,#FCFDFF)}

/* ---- 节拍器数字：午夜渐变字 + 表格数字（更利落） ---- */
.metronome-bpm{font-variant-numeric:tabular-nums;
  background:linear-gradient(160deg,#0A2463,#1B49B8);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:#0A2463}

/* ---- 底部工具/导航条：玻璃拟态 ---- */
.tool-bar,.bottom-nav{backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);
  background:rgba(255,255,255,.88)}
.tb-item{color:#5b698f;transition:.15s}
.tb-item:hover{color:var(--navy)}

/* ---- 筛选 chip 选中：渐变 ---- */
.chip.active{background:linear-gradient(135deg,#0A2463,#1B49B8)}

/* v3 补丁：块内小按钮恢复内联（h3 内右侧对齐） */
.btn.tiny{display:inline-flex;align-items:center;gap:5px;width:auto;flex:0 0 auto;margin-left:auto;
  padding:5px 12px;font-size:11.5px;border-radius:999px;background:#fff;color:var(--navy);
  border:1px solid #C9D6F0;box-shadow:0 6px 14px -10px rgba(10,36,99,.5)}
.btn.tiny.done{background:#E8F5EF;border-color:#BFE3D2;color:#1c9e6a}
.print-bar .btn{display:inline-flex;width:auto;padding:8px 16px;font-size:12.5px}

/* ============================================================
   v3.1 级别列上下延伸：填满视口高度，级别按钮等分放大
   （课时列同高对齐；按钮过多时仍可内部滚动）
   ============================================================ */
.lv-nav,.ls-nav{
  top:calc(56px + env(safe-area-inset-top) + 6px);
  height:calc(100vh - 128px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  height:calc(100dvh - 128px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  max-height:none;
}
.lv-nav .lv-btn{flex:1 1 auto;min-height:0}
@media(max-width:699px){
  .lv-btn{font-size:13px;padding:6px 4px}
  .ls-nav-hd{font-size:11.5px}
}

/* ============================================================
   v4 · Visual Evolution「Aurora Glass」
   在 v3「Midnight & Gold」基础上进化：极光底光 + 玻璃卡片 +
   蓝金节奏（模块=蓝、流程=金）。仅动色彩/光影/质感，
   布局、栅格、断点、功能与 v3.1 满屏级别列全部保持。
   ============================================================ */

/* ---- 背景：极光底光（固定光斑，极淡不抢内容） ---- */
body{
  background:
    radial-gradient(1100px 520px at 88% -8%, rgba(59,111,224,.10), transparent 62%),
    radial-gradient(900px 480px at -12% 30%, rgba(240,176,60,.07), transparent 58%),
    radial-gradient(1000px 560px at 55% 112%, rgba(27,75,184,.07), transparent 60%),
    linear-gradient(180deg,#F7F9FE,#F1F4FB 44%,#F7F9FE) fixed;
}

/* ---- 顶栏：更深的午夜 + 玻璃金线 ---- */
.app-header{background:linear-gradient(120deg,#04102E 0%,#08205C 42%,#0A2463 72%,#153B9E 100%);
  box-shadow:0 10px 30px -18px rgba(4,16,46,.8)}
.app-header::after{height:2px;
  background:linear-gradient(90deg,transparent 4%,rgba(240,176,60,.55) 30%,rgba(255,214,130,.95) 50%,rgba(240,176,60,.55) 70%,transparent 96%)}
.brand-mark{filter:drop-shadow(0 2px 6px rgba(0,0,0,.35))}

/* ---- Hero / 单课页头：极光升级 + 内辉光环 ---- */
.hero,.lv-head{
  background:
    radial-gradient(420px 200px at 86% -18%, rgba(120,160,255,.38), transparent 65%),
    radial-gradient(300px 170px at -8% 118%, rgba(240,176,60,.16), transparent 60%),
    linear-gradient(118deg,#050F2B 0%,#0A2463 46%,#1B49B8 100%);
}
.lv-head{box-shadow:0 18px 40px -22px rgba(5,15,43,.75)}
.lv-head-num{
  background:linear-gradient(160deg,rgba(255,255,255,.22),rgba(255,255,255,.08));
  box-shadow:inset 0 0 0 2px rgba(240,176,60,.6), inset 0 1px 0 rgba(255,255,255,.25), 0 8px 18px -10px rgba(0,0,0,.5)}
.lv-head::after{background:linear-gradient(90deg,transparent 2%,rgba(240,176,60,.8) 50%,transparent 98%)}

/* ---- 卡片：更轻的边、更透的白（简洁） ---- */
.block,.card,.item,.stat,.rx-steps,.note-box{
  background:rgba(255,255,255,.92);
  border-color:#E7ECF7;
  box-shadow:0 1px 2px rgba(16,24,40,.03), 0 12px 30px -20px rgba(16,24,40,.30)}
.block:hover,.card:hover{border-color:#DCE4F4}
.note-box{box-shadow:inset 3px 0 0 var(--gold), 0 8px 22px -18px rgba(16,24,40,.4)}

/* ---- 第一列：级别（选中加金点指示 + 光晕） ---- */
.lv-btn{border-radius:12px}
.lv-btn.on{box-shadow:0 10px 24px -12px rgba(10,36,99,.75), inset 0 1px 0 rgba(255,255,255,.18)}
.lv-btn.on::after{content:"";position:absolute;right:7px;top:50%;width:5px;height:5px;margin-top:-2.5px;
  border-radius:50%;background:var(--gold);box-shadow:0 0 8px rgba(240,176,60,.9)}
.lv-btn{position:relative}

/* ---- 第二列：课时（金左标 + 选中微金晕） ---- */
.ls-btn{border-radius:13px}
.ls-btn.on{box-shadow:inset 3px 0 0 var(--gold), 0 12px 26px -14px rgba(10,36,99,.7)}
.ls-btn.on .ls-n{background:rgba(240,176,60,.22);color:#FFD98A}

/* ---- 模块标签：渐变胶囊（选中=午夜蓝填充，更时尚） ---- */
.mod-tabs{gap:6px}
.mod-tab{border-radius:999px;border-color:#E3E9F6;transition:.18s}
.mod-tab:hover{border-color:#C4D2EF;transform:translateY(-1px)}
.mod-tab.on{background:linear-gradient(135deg,#0A2463,#1E4FC2);border-color:transparent;color:#fff;
  box-shadow:0 12px 26px -14px rgba(10,36,99,.8), inset 0 1px 0 rgba(255,255,255,.2)}
.mod-tab.on .mt-i{background:rgba(240,176,60,.95);color:#3b2a05}

/* ---- 流程条：选中段=星光金填充（与模块标签形成蓝金节奏） ---- */
.flow-step{border-radius:12px;transition:.18s}
.flow-step.on{background:linear-gradient(135deg,#F6BE54,#E89B1F);border-color:transparent;
  box-shadow:0 12px 26px -14px rgba(232,155,31,.85), inset 0 1px 0 rgba(255,255,255,.45)}
.flow-step.on .fw-t{color:#3b2a05}
.flow-step.on .fw-m{color:#6b4a08}
.flow-step.on .fw-i{background:rgba(59,42,5,.16);color:#3b2a05}

/* ---- 六线谱纸面：金角标 + 更干净的纸 ---- */
.tab-wrap{position:relative;border-radius:14px;overflow:hidden;
  background:linear-gradient(180deg,#FFFFFF,#FBFCFF)}
.tab-wrap::before{content:"";position:absolute;left:0;top:0;width:44px;height:3px;
  background:linear-gradient(90deg,var(--gold),rgba(240,176,60,0));border-radius:0 0 3px 0}

/* ---- 节拍器大数字：星光金渐变（新颖焦点） ---- */
.metronome-bpm{
  background:linear-gradient(160deg,#F6BE54,#E08E14 70%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---- 主按钮：金 pill + 顶部光泽 ---- */
.btn.gold{border-radius:999px;
  background:linear-gradient(160deg,#FFD37A 0%,var(--gold) 38%,#DE9520 100%);
  box-shadow:0 14px 28px -14px rgba(224,154,36,.95), inset 0 1px 0 rgba(255,255,255,.55)}

/* ---- 筛选 chip / 底部条：跟随升级 ---- */
.chip.active{background:linear-gradient(135deg,#0A2463,#1E4FC2);border-color:transparent;
  box-shadow:0 10px 20px -12px rgba(10,36,99,.75)}
.tool-bar,.bottom-nav{background:rgba(255,255,255,.86);
  box-shadow:0 -8px 30px -18px rgba(16,24,40,.35)}

/* ---- 统计卡：数字渐变 ---- */
.stat b{background:linear-gradient(150deg,#0A2463,#1E4FC2);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---- 精简滚动条（两列导航 & 谱面横向） ---- */
.lv-nav::-webkit-scrollbar,.ls-nav::-webkit-scrollbar,.tab-wrap::-webkit-scrollbar{width:4px;height:4px}
.lv-nav::-webkit-scrollbar-thumb,.ls-nav::-webkit-scrollbar-thumb,.tab-wrap::-webkit-scrollbar-thumb{
  background:#C9D5EE;border-radius:4px}
.lv-nav::-webkit-scrollbar-track,.ls-nav::-webkit-scrollbar-track,.tab-wrap::-webkit-scrollbar-track{background:transparent}

/* ---- 登录卡：玻璃 + 金顶线 ---- */
.login-card{position:relative;overflow:hidden;border-radius:18px;
  background:rgba(255,255,255,.94);box-shadow:0 24px 60px -28px rgba(5,15,43,.55)}
.login-card::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,transparent,var(--gold),transparent)}

/* ---- 徽章：更柔 ---- */
.badge{border-radius:999px;padding:2.5px 9px}

/* ---- 键盘可达性 ---- */
button:focus-visible,.item:focus-visible{outline:2px solid rgba(240,176,60,.85);outline-offset:2px}

/* ============================================================
   v4.2 单课页连续滚动版式：去掉流程条/模块标签，五区竖排
   ============================================================ */
.lesson-sec{margin-top:14px}
.lesson-sec:first-of-type{margin-top:6px}
.lesson-sec .section-title{margin-bottom:8px}
.lesson-sec .section-title h2{font-size:16px}
.print-bar{margin:10px 0 2px}

/* ============================================================
   v4.3 制谱台（Studio）：录谱表单 / 专业记号速查 / 和弦库 / 图片谱库
   ============================================================ */
.studio-block{margin-bottom:12px}
.studio-block h3{font-size:14.5px;margin-bottom:8px}
.st-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px;margin-bottom:8px}
.st-form-2{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.st-form label{display:flex;flex-direction:column;gap:3px;font-size:12px;font-weight:700;color:var(--navy)}
.st-form input,.st-form select,.st-bar input,.st-bar select{
  font-size:13px;padding:7px 9px;border:1px solid #DDE4F2;border-radius:10px;background:#fff;color:var(--ink);font-weight:500}
.st-form input:focus,.st-bar input:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(240,176,60,.18)}
.st-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:8px 0}
.st-file{cursor:pointer}
/* 专业记号速查 */
.st-legend{background:#F7F9FE;border:1px solid #E6ECF8;border-radius:12px;padding:10px 12px;margin:8px 0}
.st-legend>b{display:block;color:var(--navy);font-size:13px;margin-bottom:6px}
.st-lg-row{display:flex;gap:8px;font-size:12px;line-height:1.6;color:var(--body);border-bottom:1px dashed #E7ECF7;padding:2px 0}
.st-lg-row:last-child{border-bottom:0}
.st-lg-row span{flex:0 0 62px;font-weight:800;color:var(--navy);font-family:ui-monospace,Consolas,monospace}
.st-lg-row code,.st-syntax code{background:#EEF3FD;border-radius:4px;padding:0 4px;font-size:11.5px;color:#1B49B8}
/* 和弦按法库 */
.st-chords{margin:8px 0}
.st-chords>b{display:block;color:var(--navy);font-size:13px;margin-bottom:6px}
.st-chips{display:flex;flex-wrap:wrap;gap:5px}
.st-chips .chip{font-size:12px;padding:4px 10px}
/* 语法说明 */
.st-syntax{background:#FFFDF6;border:1px solid #F0E3C0;border-radius:12px;padding:9px 12px;font-size:12px;line-height:1.75;color:#6b5216;margin:8px 0}
/* 小节编辑 */
.st-bar{border:1px solid #E7ECF7;border-radius:12px;padding:8px;margin-bottom:8px;background:#fff;transition:.15s}
.st-bar.on{border-color:var(--gold);box-shadow:0 0 0 3px rgba(240,176,60,.16)}
.st-bh{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--navy);margin-bottom:6px;flex-wrap:wrap}
.st-bh select,.st-bh input{font-size:11.5px;padding:4px 7px;border:1px solid #DDE4F2;border-radius:8px}
.st-bh .st-sec{width:130px}
.st-bh .btn.tiny{margin-left:auto}
.st-brow{display:flex;gap:8px;margin-bottom:6px}
.st-brow input{flex:1}
.st-bar .st-mel,.st-bar .st-lyr,.st-bar .st-tab{display:block;width:100%;margin-bottom:6px}
.st-bar .st-tab{font-family:ui-monospace,Consolas,monospace;letter-spacing:.02em}
/* 自制谱 / 图片谱 列表 */
.st-list{display:flex;flex-direction:column;gap:6px;margin-top:6px}
.st-item{display:flex;align-items:center;gap:8px;border:1px solid #E7ECF7;border-radius:12px;padding:6px 8px;background:#fff}
.st-thumb{flex:0 0 56px;height:44px;border-radius:8px;overflow:hidden;background:#F2F5FC;display:flex;align-items:center;justify-content:center}
.st-thumb img{width:100%;height:100%;object-fit:cover;object-position:top}
.st-meta{flex:1;min-width:0;display:flex;flex-direction:column}
.st-meta b{font-size:12.5px;color:var(--navy)}
.st-meta span{font-size:11px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.st-ok{color:#1c9e6a!important}
.st-warn{color:#B7791F!important}
/* 图片谱画廊（课时页 / 曲目页） */
.st-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px}
.st-g{border:1px solid #E7ECF7;border-radius:10px;overflow:hidden;background:#F7F9FE;cursor:pointer;display:flex;flex-direction:column}
.st-g img{width:100%;height:120px;object-fit:cover;object-position:top;display:block}
.st-g span{font-size:10.5px;color:var(--muted);padding:3px 6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
/* 图片查看器（全屏） */
.st-viewer{position:fixed;inset:0;z-index:200;background:rgba(6,14,36,.94);display:flex;flex-direction:column;overflow:auto}
.st-viewer-hd{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;color:#fff;
  background:linear-gradient(120deg,#050F2B,#0A2463)}
.st-viewer-hd .icon-btn{color:#fff}
.st-viewer img{width:100%;max-width:1400px;margin:0 auto;display:block;background:#fff}
.st-viewer .muted{color:rgba(255,255,255,.75)!important;text-align:center}

/* ============================================================
   v4.4 图片谱「完整展示」：整页全宽纵向排列 + 打印
   ============================================================ */
.imgscore-block{margin-top:12px}
.isc-hd{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.isc-hd h3{margin:0}
.isc-acts{margin-left:auto}
.isc-pages{display:flex;flex-direction:column;gap:10px;margin-top:8px}
.isc-page{margin:0;border:1px solid #E7ECF7;border-radius:12px;overflow:hidden;background:#fff;
  box-shadow:0 8px 22px -18px rgba(16,24,40,.35)}
.isc-page figcaption{display:flex;align-items:center;gap:8px;padding:6px 10px;background:#F7F9FE;
  border-bottom:1px solid #EAF0FA;font-size:11.5px;color:var(--muted)}
.isc-no{font-weight:800;color:var(--navy)}
.isc-note{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.isc-page img{width:100%;height:auto;display:block;background:#fff;cursor:zoom-in}
@media(min-width:1000px){
  .isc-page img{max-height:none}
}
/* ===== 2026-10-28 追加：二级导航（知识地图 / 教材体系 / 教学研判） ===== */
.sub-nav{display:flex;gap:8px;padding:10px 14px 4px;max-width:1024px;margin:0 auto}
.sub-nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;
 text-decoration:none;background:#fff;border:1px solid rgba(10,36,99,.12);border-radius:12px;
 padding:8px 6px 7px;box-shadow:0 1px 6px rgba(10,36,99,.05);transition:.15s;-webkit-tap-highlight-color:transparent}
.sub-nav a:active{transform:scale(.97);background:#f7f9ff}
.sub-nav a b{font-size:17px;line-height:1.1}
.sub-nav a span{font-size:12.5px;font-weight:700;color:#0A2463;line-height:1.2}
.sub-nav a i{font-size:10px;color:#93a0ba;font-style:normal;line-height:1.2}
@media(max-width:360px){ .sub-nav a span{font-size:11.5px} .sub-nav a i{display:none} }

/* 打印整份图片谱：只留谱页 */
@media print{
  body{background:#fff!important}
  .app-header,.bottom-nav,.tb-item,.lv-nav,.ls-nav,.lesson-sec,.print-bar,.isc-acts{display:none!important}
  .isc-page{page-break-inside:avoid;border:0;box-shadow:none}
  .isc-page figcaption{display:none}
}

/* ===== 2026-10-20 追加：课时页「本课对应的技术点」（知识地图联动） ===== */
.km-row{display:flex;gap:9px;padding:9px 0;border-bottom:1px dashed rgba(10,36,99,.12);align-items:flex-start}
.km-row:last-child{border-bottom:0}
.km-dim{flex:0 0 auto;font-size:11px;font-weight:700;border-radius:6px;padding:2px 8px;margin-top:1px;white-space:nowrap}
.km-b{flex:1;min-width:0}
.km-b b{font-size:14.5px;color:#16264a;font-weight:650}
.km-role{font-size:11px;color:#8a6411;background:#fdf6e3;border-radius:5px;padding:1px 7px;margin-left:7px;white-space:nowrap}
.km-d{font-size:12.8px;color:#5a6885;line-height:1.6;margin-top:3px}
.km-foot{font-size:11.5px;color:#93a0ba;margin-top:8px}

/* ===== 2026-10-28 修正：二级导航被固定顶栏遮挡（手机/iPad「太靠上、点不住」） =====
   根因：.app-header 是 position:fixed 的 56px 浮层（*{box-sizing:border-box}，总高恒为 56px），
        而 .sub-nav 是 static，从文档流 y=0 开始，整条导航被压在顶栏底下；
        只有 iOS 下拉回弹（手指按住不松）时才短暂露出来。
   修法：① 给 sub-nav 让出顶栏 56px；② 按钮做厚、字号加大，手指好按；
        ③ 收回 .app-main 原来的顶部补偿（那是"首屏直接放内容"的设计）。 */
.sub-nav{
  margin:calc(56px + 9px) auto 0;
  padding:0 14px 8px;
  gap:9px;
}
.sub-nav a{
  min-height:62px;
  padding:10px 6px 9px;
  border-radius:14px;
  border:1px solid rgba(10,36,99,.11);
  box-shadow:0 2px 10px rgba(10,36,99,.07);
}
.sub-nav a b{font-size:19px;line-height:1.05}
.sub-nav a span{font-size:13.5px;letter-spacing:.2px}
.sub-nav a i{font-size:10.5px;margin-top:1px}
.app-main{padding-top:6px}
@media(max-width:380px){
  .sub-nav{gap:7px;padding:0 10px 6px}
  .sub-nav a{min-height:56px;padding:8px 4px}
  .sub-nav a b{font-size:17px}
  .sub-nav a span{font-size:12px}
  .sub-nav a i{display:none}
}

/* ===== 2026-10-28 排版优化：单课「本课速览卡」 =====
   目的：把「练什么 / 过关 / 配曲 / 技术点」四件事前置到课程页顶部。
   原来它们散在 ②③④⑤ 各分区，学员（和家长）要滚到底才知道本课要做什么。 */
.lsn-ov{
  background:linear-gradient(120deg,#050F2B 0%,#0A2463 52%,#16408F 100%);
  border-radius:14px;padding:12px 14px 13px;margin:0 0 14px;
  box-shadow:0 4px 16px rgba(10,36,99,.16);border:1px solid rgba(240,176,60,.22);
}
.lsn-ov-t{font-size:13.5px;font-weight:800;color:#F0B03C;letter-spacing:.3px;margin-bottom:7px}
.lsn-ov-row{display:flex;gap:9px;margin-top:6px;line-height:1.55}
.lsn-ov-k{flex:0 0 50px;font-size:12px;font-weight:700;color:rgba(240,176,60,.95);padding-top:2px}
.lsn-ov-v{flex:1;min-width:0;font-size:13px;color:#EAF0FB;word-break:break-word}
.lsn-ov-v i{font-style:normal;font-size:10.5px;font-weight:700;color:#0A2463;background:#F0B03C;
  border-radius:5px;padding:1px 5px;margin-left:4px;vertical-align:1px;white-space:nowrap}
@media(max-width:360px){
  .lsn-ov{padding:10px 11px}
  .lsn-ov-v{font-size:12.3px}
  .lsn-ov-k{flex-basis:44px;font-size:11.5px}
}
@media print{
  .lsn-ov{background:#fff!important;border:1px solid #c9d2e4;box-shadow:none}
  .lsn-ov-t{color:#0A2463}
  .lsn-ov-v{color:#1e2b49}
  .lsn-ov-k{color:#6b7a99}
  .lsn-ov-v i{background:#eef3ff;color:#0A2463}
}