*{margin:0;padding:0;box-sizing:border-box}
:root{
  --paper:#faf7f0; --paper2:#f2ebdd; --card:#fff;
  --ink:#2b2925; --ink2:#6d675c; --line:#e7ded0;
  --navy:#1b3a5c; --navy2:#2a5a86; --gold:#c8992f; --gold2:#f2e3bb;
  --w-bg:#ffeaa7; --w-line:#e2c15c;
  --p-bg:#d8ecf7; --p-line:#8dbfda;
  --pat:#b8502c;
  --fs:1;
}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  background:var(--paper); color:var(--ink); line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
#bar{position:fixed;top:0;left:0;height:3px;width:0;z-index:99;
  background:linear-gradient(90deg,var(--gold),#e8b74a);transition:width .1s linear}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;color:#f3ecdc;padding:60px 24px 44px;
  background:linear-gradient(135deg,#16304e 0%,#244b74 55%,#2f5f8c 100%);
  border-bottom:4px solid var(--gold)}
.hero::before{content:"";position:absolute;inset:0;opacity:.5;
  background-image:radial-gradient(1.5px 1.5px at 12% 26%,rgba(255,243,214,.85) 50%,transparent 51%),
    radial-gradient(1.4px 1.4px at 32% 68%,rgba(255,243,214,.6) 50%,transparent 51%),
    radial-gradient(2px 2px at 56% 20%,rgba(255,243,214,.7) 50%,transparent 51%),
    radial-gradient(1.4px 1.4px at 74% 74%,rgba(255,243,214,.6) 50%,transparent 51%),
    radial-gradient(1.6px 1.6px at 88% 32%,rgba(255,243,214,.75) 50%,transparent 51%),
    radial-gradient(1.4px 1.4px at 22% 86%,rgba(255,243,214,.5) 50%,transparent 51%)}
.hero-in{position:relative;max-width:1180px;margin:0 auto;display:grid;
  grid-template-columns:1.45fr .95fr;gap:42px;align-items:center}
.backlink{display:inline-block;font-size:12.5px;color:var(--gold2);
  border:1px solid rgba(233,196,110,.5);border-radius:999px;padding:5px 15px;
  margin:0 8px 18px 0;text-decoration:none;transition:.18s;vertical-align:top}
.backlink:hover{background:var(--gold);color:#16304e;border-color:var(--gold)}
.badge{display:inline-block;font-size:11.5px;letter-spacing:3px;text-transform:uppercase;
  color:var(--gold2);border:1px solid rgba(233,196,110,.55);
  border-radius:999px;padding:5px 15px;margin-bottom:18px}
.hero h1{font-family:Georgia,"Songti SC","SimSun",serif;font-size:40px;line-height:1.22;
  color:#fff8e9;letter-spacing:1px}
.hero h1 .en{display:block;margin-top:12px;font-size:19px;font-style:italic;font-weight:400;
  color:#c6d6ea;letter-spacing:.5px}
.hero p.lead{margin-top:18px;font-size:14.5px;color:#b8c8dd;max-width:600px}
.hero p.lead b{color:#f0d488;font-weight:600}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.stat{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);
  border-radius:12px;padding:14px 16px}
.stat i{display:block;font-style:normal;font-family:Georgia,serif;font-size:26px;color:#f2d68b;line-height:1.2}
.stat span{font-size:12px;color:#a9bcd4;letter-spacing:.5px}
.tips{margin-top:14px;font-size:12.5px;color:#93a9c4;line-height:1.7}

/* ---------- Strip ---------- */
.strip{background:var(--paper2);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.strip-in{max-width:1180px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;
  gap:14px;padding:11px 24px;font-size:13px}
.legend{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.lg{display:flex;align-items:center;gap:7px;color:var(--ink2)}
.sw{display:inline-block;width:16px;height:16px;border-radius:4px}
.sw.w{background:var(--w-bg);box-shadow:inset 0 0 0 1px var(--w-line)}
.sw.p{background:var(--p-bg);box-shadow:inset 0 0 0 1px var(--p-line)}
.sw.s{width:22px;height:16px;background:none;border-bottom:2px wavy var(--pat);border-radius:0}
.strip .tools{margin-left:auto;display:flex;gap:8px;align-items:center}
.btn{font-size:12.5px;font-weight:600;color:var(--navy);background:#fffdf6;
  border:1px solid #d8c9a4;border-radius:999px;padding:5px 14px;cursor:pointer;
  text-decoration:none;transition:.18s}
.btn:hover{background:var(--navy);color:#fff;border-color:var(--navy)}
.fsbtn{padding:5px 11px;font-size:12.5px;font-weight:700;color:var(--navy);background:#fffdf6;
  border:1px solid #d8c9a4;border-radius:8px;cursor:pointer}
.fsbtn:hover{background:var(--gold2)}

/* ---------- Layout ---------- */
.lesson{max-width:1180px;margin:0 auto;padding:40px 24px 8px;display:grid;
  grid-template-columns:minmax(0,1fr) 306px;gap:38px;align-items:start}
.article-card{min-width:0}
.article-card{background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:36px 42px 28px;box-shadow:0 8px 26px rgba(70,52,20,.06);position:relative}
.article-card::before{content:"";position:absolute;top:0;left:42px;right:42px;height:4px;
  border-radius:0 0 4px 4px;background:linear-gradient(90deg,var(--gold),transparent 72%)}
.article-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.article-head h2{font-family:Georgia,"Songti SC",serif;font-size:23px;color:var(--navy);letter-spacing:.5px}
.article-head .sub{font-size:12.5px;color:var(--ink2)}
.article-note{font-size:12.5px;color:var(--ink2);background:#fdf9ee;border:1px dashed #e3d3ac;
  border-radius:10px;padding:9px 14px;margin:14px 0 26px}
.article-note b{color:var(--pat)}

.article-body{font-family:Georgia,"Times New Roman","Songti SC",serif;
  font-size:calc(17px * var(--fs));line-height:2.02;color:#332f27;text-align:justify}
.article-body p{margin-bottom:19px}
.article-body p:first-of-type::first-letter{font-size:1.05em}

.sec-head{margin:38px 0 22px;padding-bottom:10px;border-bottom:1px solid var(--line);
  display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.sec-head:first-child{margin-top:6px}
.sec-head h3{font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:17px;color:var(--navy);
  letter-spacing:1px;position:relative;padding-left:14px}
.sec-head h3::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:4px;
  border-radius:2px;background:linear-gradient(var(--gold),#e6c470)}
.sec-head .en{font-size:12px;color:#a2937a;letter-spacing:1.4px;text-transform:uppercase;
  font-family:Georgia,serif}

.dialogue{background:#fdfaf2;border-left:3px solid var(--gold);border-radius:0 10px 10px 0;
  padding:16px 20px 6px;margin:22px 0 24px}
.dialogue p{font-family:"SF Mono",Menlo,Consolas,monospace;font-size:calc(13.5px * var(--fs));
  line-height:1.9;color:#4a443a;margin-bottom:10px}
.digits{margin:22px 0 26px;padding:16px 18px;background:#f7f4ea;border:1px solid var(--line);
  border-radius:12px;font-family:"SF Mono",Menlo,Consolas,monospace;
  font-size:calc(13px * var(--fs));line-height:2.1;letter-spacing:2.5px;color:#4a443a;
  word-break:break-all;text-align:center}

/* ---------- Highlights ---------- */
.hl-w,.hl-p{cursor:pointer;border-radius:3px;padding:1px 2px;
  box-shadow:inset 0 -1px 0 rgba(0,0,0,.08);transition:filter .15s}
.hl-w{background:var(--w-bg)}
.hl-p{background:var(--p-bg)}
.hl-w:hover,.hl-p:hover{filter:brightness(.94)}
.hl-s{cursor:pointer;text-decoration:underline wavy var(--pat);
  text-decoration-thickness:1.3px;text-underline-offset:5px}
.hl-s:hover{background:rgba(184,80,44,.07)}
@keyframes flash{0%{box-shadow:0 0 0 0 rgba(200,153,47,.85)}100%{box-shadow:0 0 0 16px rgba(200,153,47,0)}}
.flash{border-radius:5px;animation:flash .85s ease-out 2}

/* ---------- Sidebar ---------- */
.side{position:sticky;top:62px;min-width:0;max-height:calc(100vh - 74px);display:flex;flex-direction:column;gap:16px}
.side-card{background:var(--card);border:1px solid var(--line);border-radius:16px;
  box-shadow:0 8px 26px rgba(70,52,20,.06);overflow:hidden;display:flex;flex-direction:column;min-height:0}
.side-head{padding:16px 18px 12px;border-bottom:1px solid var(--line);background:#fdfbf5}
.side-head h2{font-size:15px;color:var(--navy);letter-spacing:.5px}
.side-head p{font-size:11.5px;color:var(--ink2);margin-top:4px}
.tabs{display:flex;gap:6px;margin-top:11px}
.tab{flex:1;font-size:12.5px;font-weight:600;color:var(--ink2);background:#f4efe3;border:1px solid transparent;
  border-radius:8px;padding:6px 0;cursor:pointer;transition:.16s}
.tab:hover{background:#ece4d3}
.tab.on{background:var(--navy);color:#fff}
.search{margin:0;padding:12px 18px;border-bottom:1px solid var(--line)}
.search input{width:100%;font-size:13px;padding:8px 11px;border:1px solid var(--line);
  border-radius:9px;background:#fdfbf5;color:var(--ink);outline:none;font-family:inherit}
.search input:focus{border-color:var(--gold);background:#fff}
.side-list{min-height:0;overflow:auto;padding:8px 10px 14px}
.side-list::-webkit-scrollbar{width:7px}
.side-list::-webkit-scrollbar-thumb{background:#ddd0b6;border-radius:4px}
.s-item{display:flex;gap:9px;align-items:flex-start;padding:8px 9px;border-radius:9px;
  cursor:pointer;transition:.15s}
.s-item:hover{background:#f6f1e4}
.s-item .dot{width:7px;height:7px;border-radius:50%;margin-top:8px;flex:none}
.s-item.word .dot{background:var(--w-line)}
.s-item.phrase .dot{background:var(--p-line)}
.s-item.pattern .dot{background:var(--pat);border-radius:0;height:2px;width:11px;margin-top:11px}
.s-item .txt{min-width:0}
.s-item .t{font-size:13.5px;font-weight:600;color:#31404f;word-break:break-word}
.s-item .p{font-size:11px;color:#9a9384;font-family:Georgia,serif}
.s-item .z{font-size:12px;color:var(--ink2);line-height:1.55}
.s-empty{padding:20px;text-align:center;color:var(--ink2);font-size:13px}
.s-group{padding:9px 10px 5px;font-size:11px;letter-spacing:1.5px;color:#a8977a;
  font-weight:700;border-top:1px dashed var(--line);margin-top:4px}
.s-group:first-child{border-top:none;margin-top:0}

/* ---------- Popup ---------- */
.pop{position:fixed;z-index:90;width:370px;max-width:calc(100vw - 24px);background:#fff;
  border:1px solid var(--line);border-top:3px solid var(--gold);border-radius:14px;
  box-shadow:0 20px 46px rgba(35,26,8,.24);opacity:0;transform:translateY(8px) scale(.97);
  pointer-events:none;transition:opacity .16s ease,transform .16s ease}
.pop.on{opacity:1;transform:none;pointer-events:auto}
.pop-h{padding:15px 18px 12px;border-bottom:1px solid var(--line);background:#fdfbf5;
  border-radius:0 0 0 0;display:flex;gap:10px;align-items:flex-start}
.pop-h .txt{flex:1;min-width:0}
.pop .tag{display:inline-block;font-size:10.5px;font-weight:700;letter-spacing:1px;
  padding:2px 8px;border-radius:999px;margin-bottom:6px}
.tag.word{background:var(--w-bg);color:#8a6a12}
.tag.phrase{background:var(--p-bg);color:#2c6080}
.tag.pattern{background:#f6ddd4;color:var(--pat)}
.pop .term{font-family:Georgia,serif;font-size:19px;color:var(--navy);line-height:1.35;
  word-break:break-word}
.pop .phon{font-size:12.5px;color:var(--ink2);font-family:Georgia,serif;margin-top:3px}
.pop .close{background:none;border:none;color:#b3aa98;font-size:19px;line-height:1;
  cursor:pointer;padding:2px 4px}
.pop .close:hover{color:var(--pat)}
.pop-b{padding:14px 18px 18px;max-height:52vh;overflow:auto}
.pop-b .row{margin-bottom:12px;display:flex;gap:9px}
.pop-b .row:last-child{margin-bottom:0}
.pop-b .lab{flex:none;width:46px;font-size:11.5px;color:#fff;background:var(--navy2);
  border-radius:6px;text-align:center;padding:2px 0;height:20px;line-height:16px;margin-top:2px}
.pop-b .lab.zh{background:#c9902f}
.pop-b .lab.use{background:#4f7f6a}
.pop-b .lab.eg{background:var(--pat)}
.pop-b .val{font-size:13.5px;line-height:1.8;color:#3a362e}
.pop-b .val.en{font-family:Georgia,serif;font-size:13.5px;color:#4a4436}
.pop .spk{background:#f4efe3;border:1px solid #e0d4b8;color:var(--navy);border-radius:7px;
  font-size:11px;padding:2px 8px;cursor:pointer;margin-left:6px}
.pop .spk:hover{background:var(--gold2)}

/* ---------- Reference tables ---------- */
.refs{max-width:1180px;margin:0 auto;padding:46px 24px 10px}
.ref-block{background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:28px 30px 30px;margin-bottom:30px;box-shadow:0 8px 26px rgba(70,52,20,.06)}
.ref-block h2{font-family:Georgia,"Songti SC",serif;font-size:21px;color:var(--navy);
  display:flex;align-items:center;gap:10px;margin-bottom:6px}
.ref-block h2 em{font-style:normal;font-size:12px;color:#fff;background:var(--navy2);
  border-radius:999px;padding:2px 10px;letter-spacing:.5px}
.ref-block .desc{font-size:12.5px;color:var(--ink2);margin-bottom:18px}
.tbl-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{background:#f4efe3;color:var(--navy);font-size:12.5px;font-weight:700;letter-spacing:.5px;
  text-align:left;padding:10px 12px;border-bottom:2px solid #e2d7bf;white-space:nowrap}
td{padding:11px 12px;border-bottom:1px solid #f0e9db;vertical-align:top;line-height:1.7}
tr:last-child td{border-bottom:none}
tbody tr:hover td{background:#fdfbf4}
tr.grp td{background:linear-gradient(90deg,#f4efe3,#fdfbf5);color:var(--navy);
  font-weight:700;font-size:12.5px;letter-spacing:1px;padding:9px 12px;border-bottom:1px solid #e2d7bf}
tr.grp td span{float:right;font-weight:400;color:#a8977a;letter-spacing:1.2px;
  font-family:Georgia,serif;font-size:11px;text-transform:uppercase}
.c-term{white-space:nowrap;font-family:Georgia,serif;font-size:14.5px;color:var(--navy)}
.c-term b{font-weight:600}
.c-phon{color:#8d8471;font-family:Georgia,serif;font-size:12.5px;white-space:nowrap}
.c-pos{color:var(--pat);font-size:12px;white-space:nowrap}
.c-zh{color:#2f2c26;font-weight:600;white-space:nowrap}
.definition-en{display:block;max-width:280px;margin-top:4px;color:#6d6962;font:12px/1.5 Georgia,serif;white-space:normal}
.c-note{color:#5d574b;font-size:13px;min-width:200px}
.c-ex{color:#4a4436;font-family:Georgia,serif;font-style:italic;font-size:13px;min-width:230px}
.c-src{color:#4a4436;font-family:Georgia,serif;font-size:13px;font-style:italic;min-width:250px}
.spk{background:#f4efe3;border:1px solid #e0d4b8;color:var(--navy);border-radius:6px;
  font-size:10px;padding:1px 6px;cursor:pointer;margin-left:6px;vertical-align:middle}
.spk:hover{background:var(--gold2)}
.spk.playing{background:var(--gold);color:#fff;border-color:var(--gold)}

footer{text-align:center;padding:34px 24px 46px;color:#a1957f;font-size:12.5px}
footer .star{color:var(--gold);letter-spacing:8px;margin-bottom:8px}

@media (max-width:1000px){
  .hero-in{grid-template-columns:1fr;gap:26px}
  .lesson{grid-template-columns:minmax(0,1fr);grid-template-areas:"audio" "article" "side";gap:20px}
  .article-card{grid-area:article}
  .side{position:static;display:contents;max-height:none}
  .side-card{grid-area:side;display:block}
  .side-list{max-height:340px}
  .article-card{padding:26px 20px 20px}
  .article-card::before{left:20px;right:20px}
  .hero h1{font-size:31px}
  .ref-block{padding:20px 16px}
  .pop{left:12px !important;right:12px;top:auto !important;bottom:12px;width:auto;transform:translateY(14px)}
}

/* Shared listening panel and floating controls */
.listening{min-width:0;flex-shrink:0;padding:16px;background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 26px rgba(70,52,20,.06)}
.listening-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--navy);font-weight:600;margin-bottom:12px}
.audio-status{font-size:12px;color:var(--ink2);font-weight:400}
.listening audio{width:100%;display:block}
.listening audio:not([src]){display:none}
.audio-note,.audio-credit{font-size:12px;color:var(--ink2);margin-top:8px}
.audio-capsule{position:fixed;bottom:calc(24px + env(safe-area-inset-bottom, 0px));right:calc(24px + env(safe-area-inset-right, 0px));z-index:80;display:flex;align-items:center;gap:14px;max-width:calc(100vw - 24px);padding:10px 14px 10px 10px;background:var(--navy);color:#fff7e6;border:1px solid #49627e;border-radius:999px;box-shadow:0 12px 40px #13284055}
.audio-capsule[hidden]{display:none}
.audio-toggle,.audio-return{border:0;border-radius:999px;cursor:pointer;flex-shrink:0;min-width:44px;min-height:44px;font:inherit}
.audio-toggle{background:var(--gold2);color:var(--navy);padding:8px 15px;font-size:13px;font-weight:700}
.audio-return{background:#ffffff18;color:#fff;font-size:20px}
.capsule-info{display:flex;flex-direction:column;min-width:0;gap:2px}
.capsule-info strong{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:220px}
.audio-time{font-size:11px;color:#bed0e4;font-variant-numeric:tabular-nums}
.s-pos{display:inline-block;color:var(--pat);font-size:11px;background:#f6ede1;padding:0 5px;border-radius:4px;margin:2px 0}
.drawing{margin:26px auto;text-align:center}.drawing img{display:block;max-width:100%;max-height:380px;height:auto;width:auto;margin:auto;border-radius:8px}
figcaption{font-size:12px;color:var(--ink2);line-height:1.7;margin-top:10px}figcaption .en{display:block;font-style:italic}
.chapter-mark{text-align:center;color:var(--gold);letter-spacing:8px}
.ref-head{margin-bottom:24px;color:var(--navy)}.ref-block h3{color:var(--navy);margin-bottom:12px}.ref-block .en{font-size:12px;font-weight:400}
.refs td.pos{color:var(--pat);white-space:nowrap}.refs td.phon{font-family:Georgia,serif;color:var(--ink2)}
.refs td.example,.refs td.usage{min-width:200px}.refs td.word{min-width:120px;font-weight:600}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
@media(max-width:600px){.listening{padding:16px}.strip-in{padding:10px 12px;gap:8px}.strip .tools{margin-left:0;flex-wrap:wrap}.lesson{padding:24px 12px 8px}.refs{padding:26px 12px 100px}.audio-capsule{bottom:calc(12px + env(safe-area-inset-bottom, 0px));right:calc(12px + env(safe-area-inset-right, 0px));gap:9px}.capsule-info strong{max-width:140px}.article-body{text-align:left}.pop{bottom:90px}}
.audio-capsule{width:max-content}
@media(max-width:600px){.strip .tools{gap:6px}.strip .btn{padding:5px 9px;font-size:12px}.strip .fsbtn{padding:5px 8px}}
@media(max-width:1000px){.listening{grid-area:audio}}

/* Reading progress */
.reading-progress-widget{position:fixed;top:14px;left:50%;transform:translateX(-50%);z-index:85;display:flex;align-items:center;gap:10px;padding:7px 12px;background:#fffdf8eb;border:1px solid var(--line);border-radius:999px;box-shadow:0 5px 20px #24364b22;backdrop-filter:blur(10px);color:var(--navy);font-size:11px;white-space:nowrap}.reading-progress-widget>span:first-child{display:flex;gap:4px}.reading-progress-widget b{font-variant-numeric:tabular-nums}.reading-progress-track{width:74px;height:5px;overflow:hidden;background:#e9dfca;border-radius:999px}.reading-progress-track i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),var(--gold2));border-radius:inherit;transition:width .2s ease}.resume-reading{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:79;display:flex;align-items:center;gap:12px;padding:10px 12px 10px 16px;border-radius:999px;background:var(--navy);color:#fff;box-shadow:0 12px 36px #172b4550;font-size:13px}.resume-reading[hidden]{display:none}.resume-reading button{border:0;border-radius:999px;padding:8px 13px;background:var(--gold2);color:var(--navy);font:inherit;font-weight:700;cursor:pointer}.resume-reading .resume-close{min-width:32px;padding:6px;background:#ffffff17;color:#fff;font-size:18px;line-height:1}@media(max-width:600px){.reading-progress-widget{top:auto;bottom:12px;left:12px;transform:none}.resume-reading{left:12px;right:12px;bottom:72px;transform:none;justify-content:center}.resume-reading span{min-width:0}.resume-reading .resume-close{margin-left:auto}}