/* ============ 基础 ============ */
:root{
  --ink:#1B1D1A;
  --paper:#F7F5EF;
  --paper-2:#EFEDE3;
  --pine:#2E4B3D;
  --pine-deep:#1F362C;
  --pine-soft:#E5ECE7;
  --gold:#B98A2F;
  --gold-soft:#F3E9D3;
  --red:#C2472E;
  --red-soft:#F7E3DC;
  --gray:#5E635B;
  --line:#DCD7C8;
  --sidebar-w:304px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:24px;}
body{
  font-family:"Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;  /* 禁止水平滚动: 手机上手指左右滑不应该把整页带偏 */
}
html{overflow-x:hidden;}
::selection{background:var(--gold-soft);}
.serif{font-family:"Noto Serif SC",Georgia,"Songti SC",serif;}

/* ============ 进度条 ============ */
#progressBar{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--gold),var(--red));z-index:100;transition:width .1s linear;}

/* ============ 布局 ============ */
.layout{display:flex;align-items:flex-start;max-width:1440px;margin:0 auto;}
.sidebar{
  position:sticky;top:0;height:100vh;width:var(--sidebar-w);flex:none;
  background:var(--pine-deep);color:#EDEADF;padding:28px 20px 40px;
  overflow-y:auto;display:flex;flex-direction:column;gap:18px;
}
.sidebar::-webkit-scrollbar{width:6px;}
.sidebar::-webkit-scrollbar-thumb{background:rgba(255,255,255,.18);border-radius:3px;}
.side-brand{display:flex;align-items:center;gap:10px;font-family:"Noto Serif SC",serif;font-weight:700;font-size:17px;letter-spacing:.5px;color:#F3E9D3;text-decoration:none;}
.side-brand .mark{width:34px;height:34px;flex:none;border-radius:8px;background:var(--gold);color:var(--pine-deep);display:grid;place-items:center;font-size:15px;font-weight:900;}
.side-sub{font-size:12px;color:rgba(237,234,223,.55);letter-spacing:2px;text-transform:uppercase;margin-top:-10px;}
.side-nav{list-style:none;display:flex;flex-direction:column;gap:2px;}
.side-nav a{
  display:block;color:rgba(237,234,223,.78);text-decoration:none;font-size:14px;
  padding:7px 12px;border-radius:8px;border-left:3px solid transparent;line-height:1.5;
}
.side-nav a .n{color:var(--gold);font-size:12px;margin-right:8px;font-weight:700;}
.side-nav a:hover{background:rgba(255,255,255,.07);color:#fff;}
.side-nav a.active{background:rgba(255,255,255,.10);color:#fff;border-left-color:var(--gold);}
.side-nav .grp{font-size:11px;letter-spacing:1.5px;color:rgba(237,234,223,.4);padding:14px 12px 4px;text-transform:uppercase;}
.side-foot{margin-top:auto;font-size:11.5px;color:rgba(237,234,223,.4);line-height:1.6;padding:0 4px;}

.main{flex:1;min-width:0;padding:0 48px 120px;}
.content{max-width:840px;margin:0 auto;}

/* ============ Hero ============ */
.hero{
  background:var(--pine-deep);color:#EDEADF;margin:0 -48px 0;
  padding:96px 48px 0;position:relative;overflow:hidden;
}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(185,138,47,.22),transparent 65%);pointer-events:none;}
.hero-inner{max-width:840px;margin:0 auto;position:relative;z-index:1;}
.hero-kicker{display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:3px;color:var(--gold);font-weight:700;text-transform:uppercase;}
.hero-kicker::before{content:"";width:34px;height:1px;background:var(--gold);}
.hero h1{font-family:"Noto Serif SC",serif;font-size:56px;line-height:1.18;margin:22px 0 20px;font-weight:900;letter-spacing:1px;}
.hero h1 em{font-style:normal;color:var(--gold);}
.hero-sub{font-size:17px;color:rgba(237,234,223,.82);max-width:640px;line-height:1.9;}
.hero-principles{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:44px 0 0;padding:26px 0 34px;border-top:1px solid rgba(237,234,223,.14);}
.hp{display:flex;gap:12px;align-items:flex-start;}
.hp .dot{width:8px;height:8px;border-radius:50%;background:var(--gold);margin-top:11px;flex:none;}
.hp b{display:block;font-size:14.5px;color:#F3E9D3;margin-bottom:3px;}
.hp span{font-size:12.5px;color:rgba(237,234,223,.6);line-height:1.6;}

/* ============ 章节通用 ============ */
.chapter{padding-top:88px;}
.ch-head{display:flex;gap:18px;align-items:flex-start;margin-bottom:26px;}
.ch-num{
  flex:none;width:56px;height:56px;border-radius:12px;background:var(--pine);color:#F3E9D3;
  display:grid;place-items:center;font-family:"Noto Serif SC",serif;font-size:22px;font-weight:900;letter-spacing:1px;
  box-shadow:0 6px 18px rgba(46,75,61,.18);
}
.ch-title{font-family:"Noto Serif SC",serif;font-size:32px;font-weight:900;line-height:1.3;margin-bottom:4px;}
.ch-en{font-size:13px;color:var(--gray);letter-spacing:1.5px;text-transform:uppercase;}
/* .tts-en 强制允许换行: 任何外部样式(如 nowrap)都会覆盖此处 —— 表格里英文单词必须在单元格内断行 */
.tts-en, .en.tts-en{white-space:normal !important;display:inline !important;overflow-wrap:break-word !important;word-break:break-word !important;}
.ch-intro{font-size:17px;color:var(--gray);margin:0 0 8px;line-height:1.9;}
.ch-intro b{color:var(--ink);}

.lead-q{
  background:var(--gold-soft);border:1px solid #E7D7AC;border-radius:14px;
  padding:22px 26px;margin:30px 0 26px;position:relative;
}
.lead-q .tag{display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:2px;color:#8A641D;text-transform:uppercase;margin-bottom:8px;}
.lead-q p{font-family:"Noto Serif SC",serif;font-size:19px;font-weight:700;line-height:1.7;color:#4A3A12;}

.logic{
  background:var(--pine-soft);border:1px solid #C9D9CE;border-radius:14px;padding:24px 28px;margin:26px 0;
}
.logic h4{font-family:"Noto Serif SC",serif;font-size:17px;color:var(--pine-deep);margin-bottom:10px;display:flex;align-items:center;gap:8px;}
.logic h4 .ic{width:22px;height:22px;flex:none;border-radius:6px;background:var(--pine);color:#F3E9D3;display:grid;place-items:center;font-size:12px;font-weight:900;}
.logic p{font-size:15.5px;line-height:1.95;color:#24382E;}
.logic p + p{margin-top:10px;}
.logic b{color:var(--pine-deep);}
.logic .lg{color:var(--red);font-weight:700;}

h3.sec{font-family:"Noto Serif SC",serif;font-size:23px;font-weight:900;margin:42px 0 16px;padding-top:6px;}
h3.sec::before{content:"";display:inline-block;width:10px;height:10px;background:var(--gold);border-radius:2px;margin-right:10px;}

.diagram{
  background:#FDFCF8;border:1px solid var(--line);border-radius:16px;
  padding:26px 22px;margin:22px 0 30px;box-shadow:0 10px 30px rgba(46,75,61,.06);
}
.diagram .cap{font-size:12.5px;color:var(--gray);text-align:center;margin-top:16px;letter-spacing:.5px;}
.diagram .cap b{color:var(--pine);}

/* 示例 */
.examples{margin:24px 0;}
.ex-block{
  border:1px solid var(--line);border-left:4px solid var(--pine);border-radius:10px;
  background:#FDFCF8;padding:16px 20px;margin-bottom:12px;
}
.ex-block .en{font-family:"Noto Serif SC","Georgia",serif;font-size:16.5px;font-weight:700;color:#17301F;margin-bottom:4px;}
.ex-block .en .hl{color:var(--red);}
.ex-block .zh{font-size:14px;color:var(--gray);margin-bottom:6px;}
.ex-block .why{font-size:14px;line-height:1.8;}
.ex-block .why b{color:var(--pine-deep);}
.ex-block .arrow{color:var(--gold);font-weight:700;}

/* 陷阱 */
.trap{
  background:var(--red-soft);border:1px solid #EBC3B6;border-radius:12px;padding:18px 22px;margin:26px 0;
}
.trap .t-title{font-size:13px;font-weight:700;color:var(--red);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:6px;display:flex;align-items:center;gap:8px;}
.trap .t-title::before{content:"!";width:18px;height:18px;border-radius:50%;background:var(--red);color:#fff;display:grid;place-items:center;font-size:12px;flex:none;}
.trap p{font-size:14.5px;line-height:1.9;color:#5C2B1D;}
.trap b{color:var(--red);}

/* 小结 */
.takeaway{
  background:var(--pine-deep);color:#EDEADF;border-radius:14px;padding:22px 26px;margin:36px 0 8px;
  display:flex;gap:16px;align-items:flex-start;
}
.takeaway .tk-ic{flex:none;width:34px;height:34px;border-radius:9px;background:var(--gold);color:var(--pine-deep);display:grid;place-items:center;font-weight:900;font-size:15px;}
.takeaway b{color:var(--gold);display:block;font-size:14px;letter-spacing:1px;margin-bottom:4px;}
.takeaway p{font-size:15px;line-height:1.85;color:rgba(237,234,223,.92);}

/* 表格 */
.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:12px;background:#FDFCF8;}
table{width:100%;border-collapse:collapse;font-size:14.5px;table-layout:fixed;}
table caption{text-align:left;font-size:13px;color:var(--gray);padding:12px 16px 4px;letter-spacing:.5px;}
th,td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.7;overflow-wrap:break-word;word-break:break-word;}
th{background:var(--pine-soft);color:var(--pine-deep);font-weight:700;font-size:13.5px;}
tbody tr:last-child td{border-bottom:none;}
td .en{font-family:Georgia,"Noto Serif SC",serif;font-weight:700;}
td .zh{color:var(--gray);font-size:13px;}

/* 通用小标签 */
.pill{display:inline-block;font-size:12px;font-weight:700;padding:2px 10px;border-radius:99px;letter-spacing:.5px;}
.pill.g{background:var(--pine-soft);color:var(--pine-deep);}
.pill.o{background:var(--gold-soft);color:#8A641D;}
.pill.r{background:var(--red-soft);color:var(--red);}

/* ============ 结语 ============ */
.finale{
  margin-top:110px;background:var(--paper-2);border:1px solid var(--line);border-radius:20px;
  padding:44px 44px 40px;
}
.finale h2{font-family:"Noto Serif SC",serif;font-size:30px;font-weight:900;margin-bottom:8px;}
.finale .sub{color:var(--gray);font-size:15px;margin-bottom:30px;}
.plan{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:34px;}
.plan .step{background:#FDFCF8;border:1px solid var(--line);border-radius:14px;padding:20px;}
.plan .step .s-num{font-family:"Noto Serif SC",serif;font-size:13px;font-weight:900;color:var(--gold);letter-spacing:2px;}
.plan .step h4{font-family:"Noto Serif SC",serif;font-size:17px;margin:8px 0 8px;}
.plan .step p{font-size:13.5px;color:var(--gray);line-height:1.8;}
.finale .foot-note{font-size:13.5px;color:var(--gray);line-height:1.9;border-top:1px solid var(--line);padding-top:18px;}

/* ============ 图示细节 ============ */
/* 1. 英汉思维对比 */
.duo{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.duo .col{border-radius:12px;padding:18px 20px;border:1px solid var(--line);background:#FDFCF8;}
.duo .col h5{font-size:14px;margin-bottom:12px;display:flex;align-items:center;gap:8px;}
.duo .zh-col h5{color:var(--red);}
.duo .en-col h5{color:var(--pine);}
.duo .col li{font-size:13.5px;line-height:1.75;list-style:none;margin-bottom:10px;padding-left:16px;position:relative;}
.duo .col li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:2px;}
.duo .zh-col li::before{background:var(--red);}
.duo .en-col li::before{background:var(--pine);}
.duo .zh-col{background:#FBF2EE;border-color:#EACFC3;}
.duo .en-col{background:var(--pine-soft);border-color:#C9D9CE;}

/* 2. 句型成分图 */
.sentence-svg{width:100%;height:auto;display:block;}
.sentence-svg .box{fill:#FDFCF8;stroke:#C9D9CE;}
.sentence-svg .box.s{fill:#E8F0EA;stroke:#7EA08D;}
.sentence-svg .box.v{fill:#F3E9D3;stroke:#C9A55A;}
.sentence-svg .box.o{fill:#F7E3DC;stroke:#D29A85;}
.sentence-svg .box.c{fill:#E6EFF7;stroke:#8FB2CC;}
.sentence-svg .box.d{fill:#EFE9F5;stroke:#A78FC8;}
.sentence-svg .box.adv{fill:#EAF0E3;stroke:#93A87C;}
.sentence-svg text{font-family:"Noto Sans SC",sans-serif;}
.sentence-svg .lbl{fill:#5E635B;font-size:12px;}
.sentence-svg .role{fill:#1F362C;font-size:13.5px;font-weight:700;}
.sentence-svg .en-t{fill:#1B1D1A;font-size:14px;font-weight:700;font-family:Georgia,serif;}
.sentence-svg .under{stroke:#C2472E;stroke-width:2;}

/* 3. 时态矩阵 */
.matrix{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;}
.mx-cell{
  border:1px solid var(--line);border-radius:10px;padding:12px 10px;cursor:pointer;
  background:#FDFCF8;transition:box-shadow .15s,transform .15s;min-height:96px;position:relative;
}
.mx-cell:hover{box-shadow:0 6px 16px rgba(46,75,61,.14);transform:translateY(-2px);}
.mx-cell .mx-t{font-size:13.5px;font-weight:700;color:var(--pine-deep);font-family:"Noto Serif SC",serif;}
.mx-cell .mx-f{font-size:13px;color:var(--red);font-weight:700;margin:3px 0 6px;font-family:Georgia,serif;}
.mx-cell .mx-e{font-size:11.5px;color:var(--gray);line-height:1.5;}
.mx-cell .mx-x{display:none;font-size:12px;color:#8A641D;background:var(--gold-soft);border-radius:6px;padding:6px 8px;line-height:1.6;margin-top:6px;}
.mx-cell.open{background:var(--gold-soft);border-color:#D9BC6F;}
.mx-cell.open .mx-x{display:block;}
.mx-cell.open .mx-e{display:none;}
.mx-heads{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:8px;}
.mx-heads>div{text-align:center;font-size:12px;font-weight:700;color:var(--gray);letter-spacing:1px;}
.mx-axis{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:12.5px;color:var(--gray);}
.mx-axis .ax-line{flex:1;height:1px;background:var(--line);position:relative;}
.mx-axis .ax-line::after{content:"→";position:absolute;right:-2px;top:-11px;color:var(--gray);font-size:14px;}
.mx-state{
  border-radius:10px;padding:12px 10px;background:var(--paper-2);border:1px solid var(--line);
  display:flex;flex-direction:column;justify-content:center;min-height:96px;text-align:center;
}
.mx-state b{font-size:14px;color:var(--pine-deep);font-family:"Noto Serif SC",serif;}
.mx-state span{font-size:11px;color:var(--gray);margin-top:2px;line-height:1.5;}
.mx-legend{font-size:12px;color:var(--gray);margin:10px 0 18px;line-height:1.7;background:var(--paper-2);border-radius:10px;padding:10px 14px;}

/* 11. 练习题 */
.quiz{margin:26px 0;border:1.5px solid var(--pine);border-radius:14px;background:#FDFCF8;overflow:hidden;}
.quiz-head{background:var(--pine);color:#F3E9D3;padding:10px 18px;font-size:13px;font-weight:700;display:flex;justify-content:space-between;align-items:center;gap:10px;}
.quiz-head .qt{letter-spacing:.5px;}
.quiz-head .ql{font-size:11.5px;font-weight:400;color:rgba(243,233,211,.75);}
.quiz-q{padding:15px 18px 4px;font-size:14.5px;line-height:1.9;}
.quiz-q .en{font-family:Georgia,"Noto Serif SC",serif;font-weight:700;}
.quiz-q .zh{color:var(--gray);font-size:13px;margin-top:2px;}
.quiz-opts{padding:8px 18px 12px;display:flex;flex-direction:column;gap:8px;}
.quiz-opt{border:1.5px solid var(--line);border-radius:10px;padding:10px 14px;font-size:14px;cursor:pointer;transition:border-color .15s,background .15s,opacity .15s;text-align:left;background:#fff;font-family:inherit;}
.quiz-opt:hover:not(:disabled){border-color:var(--gold);}
.quiz-opt.correct{border-color:var(--pine);background:var(--pine-soft);font-weight:700;}
.quiz-opt.wrong{border-color:var(--red);background:var(--red-soft);}
.quiz-opt:disabled{cursor:default;opacity:.92;}
.quiz-fb{display:none;margin:0 18px 16px;padding:12px 14px;border-radius:10px;font-size:13.5px;line-height:1.85;background:var(--pine-soft);border:1px solid #A9C3B2;}
.quiz-fb.bad{background:var(--red-soft);border:1px solid #EBC3B6;}
.quiz-fb.show{display:block;}
.quiz-fb .fb-t{font-weight:700;margin-bottom:4px;}
.quiz-fb.ok .fb-t{color:var(--pine-deep);}
.quiz-fb.bad .fb-t{color:var(--red);}
.quiz-reset{display:inline-block;margin:0 0 16px 18px;padding:7px 16px;border-radius:99px;border:1.5px solid var(--pine);background:transparent;color:var(--pine-deep);font-size:12.5px;font-weight:700;cursor:pointer;font-family:inherit;transition:background .15s;}
.quiz-reset:hover{background:var(--pine-soft);}
.quiz .ml{display:inline-block;padding:1px 8px;border-radius:6px;background:var(--pine-soft);color:var(--pine-deep);font-size:12px;font-weight:700;margin-left:6px;}

/* 12. 现代用法提示 */
.modern{background:#EFF4F7;border:1px solid #C3D4DE;border-radius:12px;padding:16px 20px;margin:24px 0;display:flex;gap:12px;align-items:flex-start;}
.modern .m-ic{flex:none;width:26px;height:26px;border-radius:8px;background:#5B7E96;color:#fff;display:grid;place-items:center;font-size:13px;font-weight:900;}
.modern b{color:#2C4A5E;display:block;font-size:13px;letter-spacing:1px;margin-bottom:4px;}
.modern p{font-size:14px;line-height:1.9;color:#2A3E4C;}
.modern .en{font-family:Georgia,serif;font-weight:700;}

/* 13. 训练营 */
.camp{background:#FDFCF8;border:1px solid var(--line);border-radius:18px;padding:30px 28px;margin-top:100px;}
.camp h2{font-family:"Noto Serif SC",serif;font-size:30px;font-weight:900;margin-bottom:8px;}
.camp .sub{color:var(--gray);font-size:14.5px;margin-bottom:26px;}
.camp-tier{font-family:"Noto Serif SC",serif;font-size:19px;font-weight:900;margin:30px 0 4px;display:flex;align-items:center;gap:10px;}
.camp-tier .t{font-size:12px;font-weight:700;padding:2px 10px;border-radius:99px;letter-spacing:1px;}
.camp-tier .t.t1{background:var(--pine-soft);color:var(--pine-deep);}
.camp-tier .t.t2{background:var(--gold-soft);color:#8A641D;}
.camp-tier .t.t3{background:var(--red-soft);color:var(--red);}
.camp-tier .t.t4{background:var(--pine);color:#fff;}
/* 13. 复习自查清单 */
.checklist{margin:20px 0 8px;}
.checklist table th{font-size:13px;}
.checklist td{font-size:14px;line-height:1.7;vertical-align:top;}
.checklist td.ck{width:64px;text-align:center;vertical-align:middle;}
.chk{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;border:2px solid var(--line);background:#fff;cursor:pointer;color:transparent;font-size:15px;font-weight:900;transition:all .15s;user-select:none;vertical-align:middle;}
.chk:hover{border-color:var(--gold);}
.chk.done{background:var(--pine);border-color:var(--pine);color:#fff;}
.checklist .ck-note{font-size:12.5px;color:var(--gray);margin:10px 0 0;}
.camp-tier .td{font-size:12.5px;color:var(--gray);font-weight:400;font-family:"Noto Sans SC",sans-serif;}
.camp-note{font-size:12.5px;color:var(--gray);margin:10px 0 4px;line-height:1.7;background:var(--paper-2);border-radius:10px;padding:10px 14px;}

/* 4. 语态镜头 */
.voice-switch{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:center;}
.voice-card{flex:1;min-width:230px;background:#FDFCF8;border:1px solid var(--line);border-radius:14px;padding:18px 20px;position:relative;}
.voice-card h5{font-size:14px;margin-bottom:10px;}
.voice-card .cam{font-size:12px;color:var(--gray);margin-bottom:8px;}
.voice-card .se{font-family:Georgia,serif;font-size:14.5px;font-weight:700;line-height:1.8;}
.voice-card .se .doer{color:var(--red);}
.voice-card .se .und{color:var(--pine);}
.voice-card.active{background:var(--pine-soft);border-color:#7EA08D;}
.voice-mid{flex:none;width:52px;height:52px;border-radius:50%;background:var(--gold);color:var(--pine-deep);display:grid;place-items:center;font-size:20px;font-weight:900;}
.voice-hint{margin-top:16px;text-align:center;font-size:13.5px;color:var(--gray);background:var(--paper-2);border-radius:10px;padding:12px;}

/* 5. 情态刻度 */
.scale{border-radius:14px;background:#FDFCF8;border:1px solid var(--line);padding:20px;margin:10px 0;}
.scale .s-title{font-size:13px;font-weight:700;color:var(--pine);letter-spacing:1px;margin-bottom:16px;}
.scale .s-bar{display:flex;gap:6px;}
.scale .s-bar .step{flex:1;text-align:center;}
.scale .s-bar .bar{height:12px;border-radius:6px;background:var(--pine-soft);position:relative;overflow:hidden;}
.scale .s-bar .fill{position:absolute;inset:0;background:linear-gradient(90deg,#A9C3B2,#2E4B3D);}
.scale .s-bar .w{font-size:13px;font-weight:700;margin-top:6px;font-family:Georgia,serif;}
.scale .s-bar .m{font-size:11.5px;color:var(--gray);line-height:1.5;margin-top:2px;}
.scale .s-note{margin-top:14px;font-size:13.5px;color:var(--gray);line-height:1.8;border-top:1px dashed var(--line);padding-top:12px;}

/* 6. 从句拼装 */
.assembly{border-radius:14px;background:#FDFCF8;border:1px solid var(--line);padding:24px;}
.asm-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:center;margin:8px 0;}
.asm-part{border-radius:8px;padding:8px 14px;font-size:13.5px;border:1.5px solid;}
.asm-part.whole{background:var(--pine-soft);border-color:#7EA08D;color:var(--pine-deep);font-weight:700;}
.asm-part.slot{background:var(--gold-soft);border-color:#D9BC6F;color:#6E4F12;}
.asm-part.ins{background:#F7E3DC;border-color:#D29A85;color:#6E3321;}
.asm-part.pure{background:#E6EFF7;border-color:#8FB2CC;color:#23465E;}
.asm-op{color:var(--gold);font-weight:900;font-size:16px;}
.asm-caption{text-align:center;font-size:12.5px;color:var(--gray);margin-top:12px;}

/* 7. 非谓语 */
.nf-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}
.nf-card{border-radius:14px;padding:18px 20px;border:1.5px solid;background:#FDFCF8;}
.nf-card .nf-form{font-family:Georgia,serif;font-size:19px;font-weight:700;margin-bottom:6px;}
.nf-card .nf-tag{font-size:11px;font-weight:700;letter-spacing:1px;padding:2px 8px;border-radius:99px;display:inline-block;margin-bottom:10px;}
.nf-card .nf-body{font-size:13.5px;line-height:1.8;color:var(--gray);}
.nf-card .nf-ex{font-family:Georgia,serif;font-size:13px;font-weight:700;margin-top:10px;color:var(--ink);}
.nf-do{background:#FBF2EE;border-color:#EACFC3;}
.nf-do .nf-form{color:var(--red);}
.nf-do .nf-tag{background:var(--red-soft);color:var(--red);}
.nf-ing{background:#E8F0EA;border-color:#C9D9CE;}
.nf-ing .nf-form{color:var(--pine);}
.nf-ing .nf-tag{background:var(--pine-soft);color:var(--pine-deep);}
.nf-done{background:#F3E9D3;border-color:#DEC98F;}
.nf-done .nf-form{color:#8A641D;}
.nf-done .nf-tag{background:var(--gold-soft);color:#8A641D;}

/* 8. 冠词信息流 */
.infoflow{display:flex;flex-direction:column;gap:12px;max-width:560px;margin:0 auto;}
.if-item{display:flex;gap:14px;align-items:flex-start;background:#FDFCF8;border:1px solid var(--line);border-radius:12px;padding:14px 18px;}
.if-item .if-icon{flex:none;width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-weight:900;font-size:15px;}
.if-item.a .if-icon{background:var(--red-soft);color:var(--red);}
.if-item.the .if-icon{background:var(--pine-soft);color:var(--pine-deep);}
.if-item.zero .if-icon{background:var(--gold-soft);color:#8A641D;}
.if-item .if-t{font-weight:700;font-size:14.5px;}
.if-item .if-d{font-size:13px;color:var(--gray);line-height:1.7;}
.if-item .if-ex{font-family:Georgia,serif;font-size:13px;color:var(--ink);margin-top:4px;font-weight:700;}

/* 9. 介词空间 */
.space-layers{max-width:620px;margin:0 auto;position:relative;}
.sl{display:flex;align-items:center;gap:16px;border-radius:14px;padding:16px 20px;margin-bottom:10px;border:2px solid;background:#FDFCF8;position:relative;}
.sl .sl-tag{flex:none;width:64px;text-align:center;font-family:Georgia,serif;font-size:20px;font-weight:700;}
.sl .sl-name{flex:none;width:56px;font-weight:700;font-size:14.5px;}
.sl .sl-ex{font-size:13px;color:var(--gray);flex:1;line-height:1.7;}
.sl-outer{border-color:#D29A85;background:#FBF2EE;}
.sl-outer .sl-tag{color:var(--red);}
.sl-mid{border-color:#C9A55A;background:#FBF4E4;}
.sl-mid .sl-tag{color:#8A641D;}
.sl-inner{border-color:#7EA08D;background:#E8F0EA;}
.sl-inner .sl-tag{color:var(--pine);}
.sl-inner.sl-zero{border-style:dashed;}

/* 10. 虚拟语气距离 */
.reality-line{position:relative;padding:10px 0 6px;max-width:680px;margin:0 auto;}
.rl-axis{height:3px;background:var(--line);border-radius:2px;position:relative;margin:34px 8px 0;}
.rl-axis::after{content:"";position:absolute;right:-8px;top:-5px;width:0;height:0;border-left:9px solid var(--gray);border-top:5px solid transparent;border-bottom:5px solid transparent;}
.rl-node{position:absolute;top:-13px;transform:translateX(-50%);text-align:center;width:150px;}
.rl-node .rl-dot{width:16px;height:16px;border-radius:50%;margin:0 auto 8px;border:3px solid #FDFCF8;box-shadow:0 0 0 2px var(--line);}
.rl-node.r0 .rl-dot{background:var(--pine);}
.rl-node.r1 .rl-dot{background:var(--gold);}
.rl-node.r2 .rl-dot{background:var(--red);}
.rl-node.r3 .rl-dot{background:#7A4A2B;}
.rl-node .rl-f{font-size:12px;font-weight:700;font-family:Georgia,serif;}
.rl-node .rl-l{font-size:11.5px;color:var(--gray);margin-top:2px;line-height:1.5;}
.rl-table{margin-top:40px;}

/* ============ 响应式 ============ */
.sidebar-toggle{display:none;}
@media (max-width:1024px){
  .sidebar{position:fixed;left:0;top:0;z-index:90;transform:translateX(-105%);transition:transform .25s ease;box-shadow:20px 0 60px rgba(0,0,0,.25);}
  .sidebar.open{transform:translateX(0);}
  .sidebar-toggle{
    display:flex;position:fixed;top:14px;left:14px;z-index:95;width:44px;height:44px;border-radius:12px;
    background:var(--pine-deep);color:#F3E9D3;border:none;align-items:center;justify-content:center;font-size:18px;cursor:pointer;
    box-shadow:0 6px 18px rgba(31,54,44,.35);
  }
  .main{padding:0 22px 100px;}
  .hero{margin:0 -22px;padding:80px 22px 0;}
  .hero h1{font-size:38px;}
  .hero-principles{grid-template-columns:1fr;}
  .duo{grid-template-columns:1fr;}
  .plan{grid-template-columns:1fr;}
  .nf-grid{grid-template-columns:1fr;}
  .matrix{grid-template-columns:repeat(2,1fr);}
  .mx-heads{display:none;}
  .finale{padding:30px 24px;}
  .side-nav a{padding:11px 12px;min-height:44px;display:flex;align-items:center;}
  .side-brand{min-height:44px;}
  .quiz-opt{min-height:44px;}
  .quiz-reset{min-height:44px;}
  .rl-axis{display:block;border:none;height:auto;margin:0 0 4px;}
  .rl-axis::after{display:none;}
  .rl-node{position:static;transform:none;width:100%;text-align:left;display:flex;align-items:center;gap:10px;margin:0 0 10px;padding:12px 14px;background:#FDFCF8;border:1px solid var(--line);border-radius:10px;}
  .rl-node .rl-dot{margin:0;flex:none;width:14px;height:14px;}
  .rl-node .rl-f{flex:none;}
  .rl-node .rl-l{flex:1;margin:0;}
  .ch-title{font-size:26px;}
}
@media (max-width:520px){
  body{font-size:15px;}
  .hero h1{font-size:31px;}
  .ch-num{width:46px;height:46px;font-size:18px;}
  .lead-q p{font-size:17px;}
  .ex-block{padding:14px 16px;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{transition:none !important;animation:none !important;}
}

/* ===== 多页面站点导航条（深绿统一头部，对齐 FDE/门户首页） ===== */
.site-nav {
  position: sticky; top: 0; z-index: 1000;
  background: #2E4B3D;
  color: #F7F5EF;
  padding: 12px 28px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px;
  box-shadow: 0 2px 12px rgba(31,54,44,.18);
}
.site-nav .nav-home {
  font-family: 'Noto Serif SC', serif; font-weight: 900;
  color: #F7F5EF; text-decoration: none; font-size: 17px;
  display: flex; align-items: center; gap: 8px;
}
.site-nav .nav-home .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: #B98A2F; color:#1F362C;
  display: grid; place-items: center; font-size: 15px; font-weight: 900;
}
.site-nav .nav-links { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.site-nav .nav-links a {
  text-decoration: none; color: #EDEADF;
  font-size: 14px; font-weight: 500;
  padding: 6px 14px; border-radius: 6px;
  border: 1px solid rgba(247,245,239,.22); transition: all .2s;
}
.site-nav .nav-links a:hover { background: #B98A2F; color: #1F362C; border-color: #B98A2F; }
.site-nav .nav-links a.active { background: #F7F5EF; color: #2E4B3D; border-color: #F7F5EF; font-weight: 700; }
.site-nav .nav-links .sep { color: rgba(247,245,239,.3); font-size: 12px; margin: 0 2px; }

/* 首页卡片网格 */
.module-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px; margin: 20px 0;
}
.module-card {
  background: #fff; border: 1px solid rgba(46,75,61,.12);
  border-radius: 12px; padding: 20px; text-decoration: none;
  transition: all .25s; display: block;
}
.module-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(46,75,61,.12); border-color: #B98A2F; }
.module-card .mc-icon { font-size: 28px; margin-bottom: 8px; }
.module-card .mc-title { font-family: 'Noto Serif SC', serif; font-weight: 700; color: #2E4B3D; font-size: 17px; margin-bottom: 6px; }
.module-card .mc-desc { color: #5a6b62; font-size: 13px; line-height: 1.6; }
.module-card .mc-chapters { margin-top: 10px; font-size: 12px; color: #B98A2F; }

.phase-row {
  display: flex; align-items: stretch; gap: 0; margin: 16px 0;
  border-radius: 10px; overflow: hidden; border: 1px solid rgba(46,75,61,.15);
}
.phase-label {
  background: #2E4B3D; color: #F7F5EF; padding: 16px 20px;
  min-width: 120px; display: flex; flex-direction: column; justify-content: center;
}
.phase-label .pl-num { font-size: 24px; font-weight: 900; }
.phase-label .pl-name { font-size: 13px; opacity: .85; }
.phase-body { padding: 14px 20px; flex: 1; background: #fff; }
.phase-body p { margin: 4px 0; font-size: 14px; }

/* ===== TTS 朗读按钮 ===== */
.tts-wrap {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
  vertical-align: baseline;
}
.tts-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: rgba(46,75,61,.08);
  color: #2E4B3D;
  cursor: pointer;
  padding: 0;
  transition: all .15s;
  vertical-align: middle;
  flex-shrink: 0;
}
.tts-btn:hover {
  background: #2E4B3D;
  color: #F7F5EF;
}
.tts-btn.tts-playing {
  background: #B98A2F;
  color: #fff;
}
.tts-btn.tts-playing:hover {
  background: #8A641D;
}
.tts-btn:active { transform: scale(0.92); }

/* ===== 音标录音替换按钮 ===== */
.tts-rec-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: rgba(185,138,47,.10);
  color: #8A641D;
  cursor: pointer;
  padding: 0;
  transition: all .15s;
  vertical-align: middle;
  flex-shrink: 0;
}
.tts-rec-btn:hover {
  background: #8A641D;
  color: #F7F5EF;
}
.tts-rec-btn.tts-recording {
  background: #C0392B;
  color: #fff;
  animation: egc-rec-pulse 1s ease-in-out infinite;
}
.tts-rec-btn:active { transform: scale(0.92); }
.tts-rec-btn:disabled { opacity: .5; cursor: default; animation: none; }
@keyframes egc-rec-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(192,57,43,.45); }
  50% { box-shadow: 0 0 0 5px rgba(192,57,43,0); }
}

/* ===== 管理面板（首页右下角，仅本机可见） ===== */
.admin-panel {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 1300;
  display: flex;
  align-items: center;
  gap: 10px;
  background: #F7F5EF;
  border: 1px solid rgba(46,75,61,.18);
  border-radius: 999px;
  padding: 6px 8px 6px 6px;
  box-shadow: 0 6px 20px rgba(46,75,61,.14);
}
.admin-panel[hidden] { display: none; }
.admin-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  border-radius: 999px;
  background: #2E4B3D;
  color: #F7F5EF;
  font: 600 13px/1 "Noto Sans SC", sans-serif;
  padding: 8px 14px;
  cursor: pointer;
  transition: all .15s;
}
.admin-btn:hover { background: #1F352B; }
.admin-btn svg { flex-shrink: 0; }
.admin-switch-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-right: 6px;
}
.admin-switch-label {
  font: 500 12px/1 "Noto Sans SC", sans-serif;
  color: #2E4B3D;
  white-space: nowrap;
}
.admin-switch {
  position: relative;
  width: 40px;
  height: 22px;
  border: none;
  border-radius: 999px;
  background: rgba(46,75,61,.22);
  cursor: pointer;
  padding: 0;
  transition: background .18s;
}
.admin-switch .admin-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.25);
  transition: left .18s;
}
.admin-switch.on { background: #2E4B3D; }
.admin-switch.on .admin-knob { left: 21px; }

/* ===== SVG 图标（替换 emoji） ===== */
.ic { display: inline-flex; align-items: center; justify-content: center; vertical-align: middle; }
.ic svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin-round; }
.ic-book svg { stroke: currentColor; }
.ic-target svg { stroke: currentColor; }
.ic-warning svg { stroke: currentColor; }
.ic-star svg { fill: currentColor; stroke: none; }
.ic-rocket svg { stroke: currentColor; }
.ic-lightbulb svg { stroke: currentColor; }
.ic-check svg { stroke: currentColor; }
.ic-list svg { stroke: currentColor; }
.ic-pen svg { stroke: currentColor; }
.ic-book-open svg { stroke: currentColor; }

/* ===== TTS 音色选择器（挂在面包屑条右侧；无面包屑时右上角悬浮回退） ===== */
.tts-voice-picker{
  position:relative;flex:none;display:flex;align-items:center;
  font-family:'Noto Sans SC','PingFang SC',sans-serif;
}
.tts-voice-picker--fixed{
  position:fixed;top:52px;right:14px;z-index:1200;
  background:#F7F5EF;border:1px solid #2E4B3D;border-radius:18px;
  padding:4px 10px 4px 8px;box-shadow:0 2px 8px rgba(46,75,61,0.18);
}
.tts-voice-trigger{
  display:inline-flex;align-items:center;gap:6px;
  background:#2E4B3D;color:#F7F5EF;border:1px solid #B98A2F;border-radius:16px;
  padding:4px 12px 4px 9px;font-size:12px;font-family:inherit;cursor:pointer;
  max-width:190px;transition:background .15s;
}
.tts-voice-trigger:hover{background:#38594A;}
.tts-voice-trigger svg{stroke:currentColor;flex:none;}
.tts-voice-trigger .tv-name{
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;
}
.tts-voice-trigger .tv-caret{opacity:.85;}
.tts-voice-menu{
  position:absolute;top:calc(100% + 6px);right:0;width:286px;max-height:340px;overflow-y:auto;
  background:#FDFCF8;border:1px solid #E2DCC8;border-radius:12px;
  box-shadow:0 10px 30px rgba(46,75,61,.22);z-index:1300;padding:7px;display:none;
}
.tts-voice-menu.open{display:block;}
.tts-voice-item{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:7px 10px;border-radius:9px;cursor:pointer;transition:background .12s;
}
.tts-voice-item:hover{background:#EFEBDC;}
.tts-voice-item.sel{background:#2E4B3D;color:#F7F5EF;}
.tts-voice-item .tv-name{font-size:13px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.tts-voice-preview{
  width:27px;height:27px;border-radius:50%;flex:none;padding:0;
  border:1px solid currentColor;background:transparent;color:inherit;
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background .12s,transform .12s;
}
.tts-voice-preview:hover{background:rgba(185,138,47,.16);transform:scale(1.06);}
.tts-voice-preview.previewing{background:rgba(185,138,47,.28);}
.tts-voice-preview svg{width:13px;height:13px;stroke:currentColor;}
.tts-voice-item.sel .tts-voice-preview:hover{background:rgba(255,255,255,.18);}
/* 引擎切换行（自动 / 本地） */
.tts-engine-row{
  display:flex;align-items:center;gap:6px;padding:2px 6px 8px;
  border-bottom:1px solid #E2DCC8;margin-bottom:6px;
}
.tts-engine-row .ter-label{
  font-size:12px;color:#6B7A70;font-weight:600;flex:none;margin-right:2px;
}
.tts-engine-btn{
  flex:1;padding:5px 8px;border-radius:8px;cursor:pointer;font-family:inherit;
  border:1px solid #D8D2BE;background:#F7F5EF;color:#2E4B3D;font-size:12px;
  transition:background .12s,border-color .12s;
}
.tts-engine-btn:hover{background:#EFEBDC;}
.tts-engine-btn.sel{background:#2E4B3D;color:#F7F5EF;border-color:#B98A2F;}
/* 音色分组标题 */
.tts-voice-group{
  font-size:11px;color:#8A8577;font-weight:600;letter-spacing:.4px;
  padding:6px 10px 3px;user-select:none;
}

/* ===== TTS 提示条 ===== */
.tts-toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #2E4B3D;
  color: #F7F5EF;
  font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
  font-size: 13.5px;
  padding: 10px 18px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(46, 75, 61, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 1500;
  max-width: 80vw;
  text-align: center;
}
.tts-toast-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== 通用练习块 / 费曼卡片（全站统一，供 grammar / cambridge / life-abroad / workplace 共用） ===== */
.practice-block{margin:14px 0 26px;padding:14px 18px;background:#F7F5EF;border:1px dashed rgba(46,75,61,.3);border-radius:10px;}
.practice-block .pb-title{font-weight:700;color:#2E4B3D;margin:0 0 8px;display:flex;align-items:center;gap:6px;font-size:15px;}
.practice-block .pb-title svg{flex:0 0 auto;}
.practice-block ol{margin:6px 0 10px;padding-left:20px;line-height:1.95;}
.practice-block ol li{margin-bottom:4px;}
.practice-block ul.pb-answer{margin:8px 0 0;padding-left:20px;line-height:1.9;color:#3a4d43;}
.practice-block ul.pb-answer li{margin-bottom:4px;}
.practice-block em{color:#8a6d3b;font-style:normal;font-size:13px;}
.practice-block details{margin-top:8px;border-top:1px dashed rgba(46,75,61,.2);padding-top:8px;}
.practice-block summary{cursor:pointer;color:#B98A2F;font-weight:700;outline:none;}
.practice-block summary:hover{color:#2E4B3D;}
.practice-block .pb-q{margin:6px 0;line-height:1.8;}
.practice-block .pb-q b{color:#2E4B3D;}

/* 费曼学习法卡片 */
.feynman{margin:16px 0 24px;padding:15px 18px;background:#FCFBF6;border:1px solid #E7D7AC;border-left:4px solid #B98A2F;border-radius:10px;}
.feynman .fn-title{font-weight:700;color:#8A641D;font-size:14.5px;margin-bottom:7px;display:flex;align-items:center;gap:6px;}
.feynman p{margin:6px 0;line-height:1.85;font-size:14px;color:#3a4d43;}
.feynman .fn-say{padding:10px 14px;background:#fff;border:1px dashed #D9C89A;border-radius:8px;font-style:normal;}
.feynman .fn-check{margin-top:8px;padding-top:8px;border-top:1px dashed rgba(46,75,61,.2);font-size:13px;color:var(--gray,#5E635B);}
.feynman .fn-check b{color:#2E4B3D;}

/* 文化差异提示 */
.cult{margin:14px 0;padding:13px 16px;background:#F2F7F4;border:1px solid #C9D9CE;border-left:4px solid #2E4B3D;border-radius:10px;}
.cult .cult-title{font-weight:700;color:#2E4B3D;font-size:14px;margin-bottom:6px;}
.cult p{margin:5px 0;line-height:1.8;font-size:14px;color:#3a4d43;}

/* ===== 听力实战章节（listen-practice） ===== */
/* 仅供屏幕阅读器/程序触发的隐藏文本（藏 .tts-en 以复用 TTS） */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}

/* 练习卡片 */
.lp-item{border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:12px;background:#FDFCF8;padding:16px 18px;margin:16px 0;}
.lp-item .lp-q{font-size:14.5px;line-height:1.9;margin-bottom:8px;}
.lp-item .lp-q .en{font-family:Georgia,serif;font-weight:700;}
.lp-sentence{font-family:Georgia,serif;font-size:16px;font-weight:700;color:#1F362C;background:var(--pine-soft);border:1px solid #C9D9CE;border-radius:8px;padding:10px 14px;margin:8px 0;line-height:1.7;}
.lp-sentence .blank{display:inline-block;min-width:66px;border-bottom:2px dotted var(--red);color:var(--red);text-align:center;margin:0 2px;font-weight:700;}
.lp-orig{display:none;margin:10px 0;padding:10px 14px;background:var(--gold-soft);border:1px solid #E7D7AC;border-radius:8px;font-size:14.5px;line-height:1.85;}
.lp-orig.show{display:block;}
.lp-orig .en{font-family:Georgia,serif;font-weight:700;}
.lp-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:8px 0;}
.lp-play{display:inline-flex;align-items:center;gap:6px;background:var(--pine);color:#F7F5EF;border:1px solid var(--pine-deep);border-radius:99px;padding:7px 14px;font:600 13px/1 "Noto Sans SC",sans-serif;cursor:pointer;transition:background .15s;}
.lp-play:hover{background:var(--pine-deep);}
.lp-toggle{display:inline-flex;align-items:center;gap:6px;background:transparent;color:var(--pine-deep);border:1.5px solid var(--pine);border-radius:99px;padding:6px 14px;font:600 13px/1 "Noto Sans SC",sans-serif;cursor:pointer;transition:background .15s;}
.lp-toggle:hover{background:var(--pine-soft);}

/* 地图标注 */
.lp-map{width:100%;max-width:520px;height:auto;display:block;margin:10px 0;background:#FDFCF8;border:1px solid var(--line);border-radius:12px;}
.lp-zone{cursor:pointer;}
.lp-zone rect,.lp-zone circle,.lp-zone polygon{transition:stroke-width .12s,fill .12s;}
.lp-zone:hover rect,.lp-zone:hover circle,.lp-zone:hover polygon{stroke-width:3;}
.lp-zone.lp-chosen rect,.lp-zone.lp-chosen circle,.lp-zone.lp-chosen polygon{stroke-width:4;}
.lp-zone.lp-chosen[data-correct="1"] rect,.lp-zone.lp-chosen[data-correct="1"] circle,.lp-zone.lp-chosen[data-correct="1"] polygon{stroke:var(--pine);fill:var(--pine-soft);}
.lp-zone.lp-chosen:not([data-correct]) rect,.lp-zone.lp-chosen:not([data-correct]) circle,.lp-zone.lp-chosen:not([data-correct]) polygon{stroke:var(--red);fill:var(--red-soft);}

/* ===== 录音对比打分（speak-score.js 结果区样式） ===== */
.ss-ex{margin:10px 0;display:flex;flex-wrap:wrap;align-items:center;gap:10px;}
.ss-rec{
  display:inline-flex;align-items:center;gap:7px;
  background:var(--pine);color:#F7F5EF;border:1px solid var(--pine-deep);
  border-radius:99px;padding:8px 16px;font:600 13.5px/1 "Noto Sans SC",sans-serif;
  cursor:pointer;transition:background .15s;
}
.ss-rec:hover{background:var(--pine-deep);}
.ss-rec.ss-recording{background:var(--red);border-color:var(--red);animation:egc-rec-pulse 1s ease-in-out infinite;}
.ss-rec:disabled{opacity:.6;cursor:default;animation:none;}
.ss-result{margin-top:8px;width:100%;font-size:13.5px;line-height:1.85;}
.ss-result:empty{display:none;}
.ss-score{font-weight:700;color:var(--pine-deep);margin-bottom:4px;}
.ss-score b{color:var(--gold);font-size:15px;}
.ss-line{margin:3px 0;}
.ss-k{color:var(--gray);margin-right:4px;}
.ss-tr{font-family:Georgia,serif;font-weight:700;}
.ss-ok{color:var(--pine);font-weight:700;}
.ss-bad{color:var(--red);font-weight:700;}
.ss-note{margin-top:6px;font-size:12.5px;color:var(--gray);background:var(--gold-soft);border-radius:8px;padding:8px 12px;line-height:1.7;}

/* 评测模式徽标：音素级（绿） / 逐词比对（金） */
.ss-badge{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:99px;vertical-align:1px;font:600 11.5px/1.5 "Noto Sans SC",sans-serif;background:var(--pine-soft);color:var(--pine-deep);border:1px solid #C9D9CE;}
.ss-badge-b{background:var(--gold-soft);color:#8A641D;border-color:#E7D7AC;}

/* 音素级评测指标条 */
.ss-metrics{display:flex;flex-wrap:wrap;gap:8px;margin:5px 0 6px;}
.ss-metric{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:8px;background:#F7F5EF;border:1px solid var(--line);font-size:12.5px;color:var(--gray);}
.ss-metric b{color:var(--pine-deep);font-size:13px;}

/* 音素级纠错清单：应读作(绿) → 实际(红) */
.ss-phones{list-style:none;margin:6px 0 0;padding:0;display:flex;flex-direction:column;gap:5px;}
.ss-phones li{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px;padding:6px 10px;background:#FDFCF8;border:1px solid var(--line);border-left:3px solid var(--red);border-radius:8px;font-size:12.5px;line-height:1.7;}
.ss-phones .ss-word{font-family:Georgia,serif;font-weight:700;color:#24382E;}
.ss-phones .ss-arrow{color:var(--gray);font-size:11.5px;}
.ss-phones .ss-ok,.ss-phones .ss-bad{font-family:"Lucida Sans Unicode","Arial Unicode MS",Georgia,serif;letter-spacing:.3px;}
.ss-phones .ss-conf{margin-left:auto;font-size:11.5px;color:var(--gray);}
@media (max-width:560px){
  .ss-phones .ss-conf{margin-left:0;}
  .ss-metric{font-size:12px;}
}

/* ===== 角色扮演 / 语音判定容器（dialogues.html、listening.html 共用） ===== */
.ss-roleplay{margin:14px 0 26px;padding:14px 18px;background:var(--paper);border:1px solid #C9D9CE;border-left:4px solid var(--gold);border-radius:12px;}
.ss-roleplay .sr-title{display:flex;align-items:center;gap:7px;font-weight:800;color:var(--pine-deep);font-size:14.5px;margin:0 0 5px;}
.ss-roleplay .sr-title svg{flex:0 0 auto;}
.ss-roleplay .sr-desc{font-size:12.5px;color:var(--gray);line-height:1.75;margin:0 0 6px;}
.ss-roleplay .sr-desc b{color:var(--pine-deep);}
.ss-roleplay .ss-ex{margin:8px 0;align-items:center;}
.ss-role{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;min-width:54px;padding:5px 10px;border-radius:8px;background:var(--pine-soft);border:1px solid #C9D9CE;color:var(--pine-deep);font:700 12.5px/1 "Noto Sans SC",sans-serif;}
.ss-role.b{background:var(--gold-soft);border-color:#E7D7AC;color:#8A641D;}
.ss-tgt{flex:1 1 240px;font-family:Georgia,serif;font-size:13.5px;line-height:1.7;color:#24382E;}
@media (max-width:560px){
  .ss-roleplay .ss-ex{gap:8px;}
  .ss-tgt{flex:1 1 100%;order:3;}
}

/* ============ 2026-09 显示增强（全站安全追加） ============ */
/* 正文链接 hover 下划线 */
.content a{text-decoration:none;border-bottom:1px solid transparent;transition:border-color .15s,color .15s;}
.content a:hover{border-bottom-color:currentColor;}
/* 正文图片圆角阴影 */
.content img{max-width:100%;border-radius:14px;box-shadow:0 10px 30px rgba(46,75,61,.10);}
/* 正文列表间距 */
.content ul,.content ol{padding-left:24px;margin:12px 0;line-height:1.85;}
.content ul li,.content ol li{margin:4px 0;}
/* 普通表格斑马纹 + 行 hover（仅默认表格，不动 quiz/checklist 等组件表） */
table:not(.chk-tbl) tbody tr:nth-child(even) td{background:rgba(229,236,231,.45);}
table:not(.chk-tbl) tbody tr:hover td{background:rgba(229,236,231,.85);}
/* 块引用与代码框微调 */
.content blockquote{border-left:4px solid var(--gold);background:var(--gold-soft);padding:14px 20px;border-radius:0 12px 12px 0;margin:18px 0;}
/* 章节分隔感：章节顶部细线 */
.chapter + .chapter{border-top:1px solid var(--line);}
/* 按钮统一 hover 微提升（若有 .btn/.hw-btn） */
.btn,.hw-btn,.egc-hw-btn{transition:transform .15s,box-shadow .15s;}
.btn:hover,.hw-btn:hover{transform:translateY(-1px);}

/* ===== 移动端响应式增强（2026-09-24 追加） ===== */
/* ==========================================================================
   EGC 全站移动端响应式片段（通用，注入到无公共 CSS 页面时包裹在
   <style id="egc-mobile-css">…</style> 中；追加到公共 CSS 文件时直接使用）
   目标：≤900px 平板竖屏 / ≤600px 手机 / ≤420px 小屏手机
   原则：内容不被遮挡、元素不过小（可点 ≥44px）、关键交互可用
   ========================================================================== */

/* 防止横向溢出：所有媒体内先收口 */
@media (max-width: 900px){
  html, body { max-width: 100vw; overflow-x: hidden; }
  img, svg, video, canvas { max-width: 100%; height: auto; }
  /* 两列/三列/四列网格降为单列 */
  .duo, .plan, .nf-grid, .grid-2, .grid-3, .cols, .principles, .hero-principles {
    grid-template-columns: 1fr !important;
  }
  .matrix { grid-template-columns: repeat(2, 1fr) !important; }
  /* 主区 padding 收窄 */
  .main { padding: 0 20px 100px !important; }
  .wrap, .container, .page, .content { padding-left: 18px !important; padding-right: 18px !important; }
  /* 面包屑/顶栏允许换行 */
  .crumb-bar, .topnav, .site-nav, .egc-breadcrumb { flex-wrap: wrap !important; }
  /* 表格横向滚动兜底 */
  table { max-width: 100%; }
  .table-wrap, .egc-table-wrap, .table-scroll { overflow-x: auto !important; -webkit-overflow-scrolling: touch; }
}

@media (max-width: 600px){
  html, body { max-width: 100vw; overflow-x: hidden; font-size: 15px; }
  body { line-height: 1.7; }

  /* 字号下限：保证可读 */
  h1 { font-size: 22px !important; line-height: 1.35 !important; }
  h2 { font-size: 19px !important; line-height: 1.4 !important; }
  h3 { font-size: 16px !important; line-height: 1.45 !important; }
  h4, h5, h6 { font-size: 15px !important; }
  p, li, td, th, dd, dt { font-size: 15px !important; }

  /* 首屏大标题收敛 */
  .hero h1, .ch-title { font-size: 26px !important; }
  .hero { padding-top: 48px !important; }
  .lead-q p, .lead, .intro { font-size: 15.5px !important; line-height: 1.75 !important; }

  /* 容器 padding 进一步收窄 */
  .main { padding: 0 14px 90px !important; }
  .wrap, .container, .page, .content { padding-left: 14px !important; padding-right: 14px !important; }
  .ex-block, .quiz, .plan .step, .duo .col, .card { padding: 14px !important; }

  /* 所有网格强制单列 */
  .duo, .plan, .nf-grid, .grid-2, .grid-3, .grid-4, .cols, .principles,
  .hero-principles, .matrix, .card-grid, .cards {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
  }

  /* 表格：未包裹的也可横向滚 */
  table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
  .table-wrap, .egc-table-wrap { padding: 0; }

  /* 可点区域 ≥44px（排除小尺寸内联按钮：TTS 朗读钮/录音钮，它们是 22px 圆钮不能撑高） */
  a, button, .btn, .quiz-opt, .side-nav a, .toc-rail nav a, .topnav a,
  .nu-btn, .nu-link, .action-btn, [role="button"] {
    min-height: 44px;
  }
  button.tts-btn, button.tts-rec-btn, .tv-btn, .tv-caret, .egc-tb-icon {
    min-height: 0 !important;
    width: 22px !important;
    height: 22px !important;
    padding: 0 !important;
    border-radius: 50% !important;
    flex: 0 0 22px !important;
  }
  .quiz-opt, .btn, .action-btn { padding: 12px 14px !important; }

  /* 图片/视频/SVG 不溢出 */
  img, svg, video, canvas, iframe { max-width: 100% !important; height: auto !important; }
  /* 思维导图等大 SVG 给个安全高度 */
  svg.mindmap, .mindmap svg, #mindmap svg, .diagram svg { max-height: 70vh; }

  /* 面包屑换行、不省略过多 */
  .crumb-bar { padding: 6px 12px !important; font-size: 12.5px !important; }
  .crumb-cur { max-width: 60vw !important; }
  .topnav { padding: 8px 12px !important; gap: 8px !important; }

  /* 底部三栏导航（若存在）堆叠为竖排 */
  .foot-nav, .footer-nav, .bottom-nav { flex-direction: column !important; gap: 8px !important; }

  /* 代码块横向滚动 */
  pre, code { white-space: pre-wrap; word-break: break-word; }
  pre { overflow-x: auto; -webkit-overflow-scrolling: touch; }

  /* 弹层/抽屉全宽 */
  .modal, .dialog, .popup { max-width: 100vw !important; width: 100% !important; }

  /* 时间轴/流程节点纵向排列 */
  .rl-axis, .timeline { display: block !important; border: none !important; height: auto !important; }
}

/* 课程页顶部导航：仅手机端生效 */
@media (max-width: 768px){
.site-nav{padding:8px 10px !important;gap:6px !important;}
.site-nav .nav-home{font-size:15px !important;}
.site-nav .nav-home .mark{width:26px !important;height:26px !important;font-size:13px !important;}
.site-nav .nav-links{gap:4px !important;}
.site-nav .nav-links a{
  font-size:12px !important;padding:5px 8px !important;
  min-height:34px !important;display:inline-flex !important;align-items:center !important;
}
.site-nav .nav-links .sep{display:none !important;}
.crumb-bar{padding:6px 12px !important;}
.crumb-cur{max-width:55vw !important;font-size:12px !important;}
}

@media (max-width: 420px){
  html, body { font-size: 14.5px; }
  h1 { font-size: 21px !important; }
  h2 { font-size: 18px !important; }
  .hero h1, .ch-title { font-size: 23px !important; }
  .main { padding: 0 10px 80px !important; }
  .wrap, .container, .page, .content { padding-left: 10px !important; padding-right: 10px !important; }
  .matrix { grid-template-columns: 1fr !important; }
}

/* ===== 移动端汉堡导航 ===== */
@media (max-width: 768px){
  .site-nav .nav-hamburger{display:flex !important;}
  .site-nav .nav-links{display:none !important;}
  .site-nav.nav-open .nav-links{
    display:flex !important;
    position:absolute; top:100%; left:0; right:0;
    background:#2E4B3D; flex-direction:column; gap:6px;
    padding:12px; border-top:1px solid rgba(247,245,239,.15);
    box-shadow:0 8px 20px rgba(0,0,0,.2);
  }
  .site-nav.nav-open .nav-links a{width:100%; text-align:center; padding:10px !important;}
}

/* 移动端导航：左侧留10px */
@media (max-width: 768px){
  .site-nav{padding-left:10px !important;padding-right:10px !important;}
}

/* ===== 全局导航规范 ===== */
/* 手机竖屏：汉堡按钮在最左，距左10px，隐藏导航链接 */
@media (max-width: 768px){
  .site-nav{padding:8px 10px 8px 10px !important;gap:8px !important;}
  .site-nav .nav-hamburger{display:flex !important;margin-right:0 !important;}
  .site-nav .nav-links{display:none !important;}
  .site-nav.nav-open .nav-links{
    display:flex !important;position:absolute;top:100%;left:0;right:0;
    background:#2E4B3D;flex-direction:column;gap:6px;padding:12px;
    border-top:1px solid rgba(247,245,239,.15);z-index:9999;
  }
  .site-nav.nav-open .nav-links a{width:100%;text-align:center;padding:10px !important;}
}
/* PC/平板横屏：显示完整导航 */
@media (min-width: 769px){
  .site-nav .nav-hamburger{display:none !important;}
  .site-nav .nav-links{display:flex !important;}
}

/* 手机端导航左对齐 */
@media (max-width: 768px){
  .site-nav{justify-content:flex-start !important;}
}