@import url('https://fonts.googleapis.com/css2?family=Sarabun:ital,wght@0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap');
:root{--cream:#F5F0E8;--cream-dark:#EDE7D9;--ink:#1C1810;--ink2:#4A4235;--gold:#B8860B;--gold2:#D4A017;--teal:#1A5F5A;--teal2:#2A7F78;--red:#8B2020;--border:#C8BC9E;--shad:rgba(28,24,16,.12);--ok:#1A5F5A;--ng:#8B2020;--r:12px;--rs:6px}
*{box-sizing:border-box;margin:0;padding:0}
html{font-size:21px;scroll-behavior:smooth}
body{background:var(--cream);color:var(--ink);font-family:'Sarabun','Noto Serif TC',sans-serif;min-height:100vh;line-height:1.7}
/* NAV */
.top-nav{background:var(--ink);padding:13px 18px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px var(--shad)}
.nav-logo{color:var(--gold2);font-size:.72rem;font-family:'IBM Plex Mono',monospace;letter-spacing:.08em;text-decoration:none}
.nav-title{color:#fff;font-size:.95rem;font-weight:600}
.nav-back{color:var(--cream);font-size:.72rem;font-family:'IBM Plex Mono',monospace;text-decoration:none;opacity:.65;transition:opacity .2s}
.nav-back:hover{opacity:1}
/* HERO */
.hero{background:var(--teal);color:#fff;padding:30px 18px 26px;text-align:center;border-bottom:3px solid var(--gold)}
.hero .lnum{font-family:'IBM Plex Mono',monospace;font-size:.68rem;letter-spacing:.18em;color:var(--gold2);margin-bottom:8px}
.hero h1{font-size:1.6rem;font-weight:700;line-height:1.3;margin-bottom:5px}
.hero .tsub{font-family:'Sarabun',sans-serif;font-size:1.1rem;opacity:.82;margin-bottom:10px}
.hero .tags{display:flex;gap:7px;justify-content:center;flex-wrap:wrap}
.tag{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);border-radius:20px;padding:3px 11px;font-size:.65rem;font-family:'IBM Plex Mono',monospace}
/* TABS */
.tabs{display:flex;overflow-x:auto;background:var(--ink);scrollbar-width:none;-webkit-overflow-scrolling:touch}
.tabs::-webkit-scrollbar{display:none}
.tab{flex-shrink:0;padding:10px 15px;color:rgba(255,255,255,.5);font-size:.68rem;font-family:'IBM Plex Mono',monospace;letter-spacing:.06em;cursor:pointer;border-bottom:2px solid transparent;transition:all .2s;white-space:nowrap;user-select:none}
.tab.active{color:var(--gold2);border-bottom-color:var(--gold2)}
.tab:hover{color:#fff}
/* LAYOUT */
.wrap{max-width:680px;margin:0 auto;padding:0 15px 60px}
/* PANELS */
.panel{display:none;animation:fi .22s ease}
.panel.active{display:block}
@keyframes fi{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
.sec-head{display:flex;align-items:center;gap:11px;padding:26px 0 14px;border-bottom:1px solid var(--border);margin-bottom:18px}
.sec-icon{width:34px;height:34px;background:var(--teal);color:#fff;border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:.95rem;flex-shrink:0}
.sec-head h2{font-size:1.1rem;font-weight:700}
.sec-head .snum{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:var(--gold);display:block}
/* ARTICLE */
.acard{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:22px 18px;margin-bottom:14px;box-shadow:0 2px 8px var(--shad)}
.acard h3{font-size:1.05rem;font-weight:700;margin-bottom:14px;padding-bottom:11px;border-bottom:1px solid var(--cream-dark);color:var(--teal)}
.abody{font-family:'Sarabun',sans-serif;font-size:1.15rem;line-height:2.2}
.abody p{margin-bottom:.9em}
.abody p:last-child{margin-bottom:0}
.conj{color:var(--teal);font-weight:600;border-bottom:1.5px dashed var(--teal);cursor:pointer;position:relative;-webkit-tap-highlight-color:rgba(0,0,0,0)}
.conj::after{content:attr(title);position:absolute;bottom:130%;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:5px 11px;border-radius:5px;font-size:.82rem;white-space:nowrap;font-family:'Sarabun',sans-serif;font-weight:500;pointer-events:none;z-index:10;opacity:0;transition:opacity .18s}
.conj:hover::after,.conj:hover::after,.conj.tip-on::after{opacity:1}
/* VOCAB */
/* VOCAB WORD HIGHLIGHT in article */
.vword{color:var(--gold);font-weight:600;border-bottom:1.5px dashed var(--gold);cursor:pointer;position:relative;-webkit-tap-highlight-color:rgba(0,0,0,0)}
.vword::after{content:attr(title);position:absolute;bottom:130%;left:50%;transform:translateX(-50%);background:var(--gold);color:var(--ink);padding:5px 11px;border-radius:5px;font-size:.82rem;white-space:nowrap;font-family:'Sarabun',sans-serif;font-weight:600;pointer-events:none;z-index:10;opacity:0;transition:opacity .18s}
.vword:hover::after,.vword.tip-on::after{opacity:1}
/* SPEAK button */
.speak-btn{background:none;border:none;cursor:pointer;color:var(--teal);font-size:1rem;padding:0 0 0 6px;vertical-align:middle;opacity:.7;transition:opacity .2s;line-height:1}
.speak-btn:hover{opacity:1}
.speak-btn:active{transform:scale(.9)}

.vlabel{font-family:'IBM Plex Mono',monospace;font-size:.65rem;letter-spacing:.1em;color:var(--gold);margin:16px 0 8px;text-transform:uppercase}
.vgrid{display:grid;grid-template-columns:1fr;gap:9px}
.vcard{background:#fff;border:1px solid var(--border);border-radius:var(--rs);padding:13px 15px;display:grid;grid-template-columns:26px 1fr;gap:0 11px;box-shadow:0 1px 4px var(--shad)}
.vnum{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:var(--gold);padding-top:2px;font-weight:500}
.vthai{font-family:'Sarabun',sans-serif;font-size:1.08rem;font-weight:600;color:var(--teal);margin-bottom:1px;cursor:pointer;user-select:none}
.vrom{font-family:'IBM Plex Mono',monospace;font-size:.72rem;color:var(--ink2);margin-bottom:2px}
.vzh{font-size:1rem;color:var(--ink);font-weight:600}
.vpos{display:inline-block;font-family:'IBM Plex Mono',monospace;font-size:.57rem;background:var(--cream-dark);color:var(--ink2);border-radius:3px;padding:1px 5px;margin-left:5px;vertical-align:middle}
/* QUIZ */
.qprog{font-family:'IBM Plex Mono',monospace;font-size:.67rem;color:var(--ink2);margin-bottom:11px;display:flex;justify-content:space-between;align-items:center}
.pbar{flex:1;height:4px;background:var(--cream-dark);border-radius:2px;margin:0 11px;overflow:hidden}
.pfill{height:100%;background:var(--teal);border-radius:2px;transition:width .4s ease}
.qcard{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:18px;margin-bottom:11px;box-shadow:0 2px 6px var(--shad)}
.qn{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:var(--gold);margin-bottom:6px}
.qbadge{display:inline-block;font-family:'IBM Plex Mono',monospace;font-size:.55rem;padding:2px 6px;border-radius:3px;background:var(--cream-dark);color:var(--ink2);margin-bottom:9px;letter-spacing:.04em}
.qt{font-family:'Sarabun',sans-serif;font-size:1.1rem;line-height:1.9;margin-bottom:13px}
.opts{display:flex;flex-direction:column;gap:7px}
.obtn{background:var(--cream);border:1.5px solid var(--border);border-radius:var(--rs);padding:10px 13px;text-align:left;font-family:'Sarabun',sans-serif;font-size:1rem;color:var(--ink);cursor:pointer;transition:all .18s;display:flex;align-items:flex-start;gap:9px;line-height:1.5}
.obtn:hover:not(:disabled){background:var(--cream-dark);border-color:var(--teal)}
.oletter{font-family:'IBM Plex Mono',monospace;font-size:.67rem;font-weight:500;color:var(--gold);flex-shrink:0;padding-top:1px}
.obtn.ok{background:#E8F5E9;border-color:var(--ok);color:var(--ok)}
.obtn.ok .oletter{color:var(--ok)}
.obtn.ng{background:#FDECEA;border-color:var(--ng);color:var(--ng);text-decoration:line-through;opacity:.75}
.obtn:disabled{cursor:default}
.fb{display:none;margin-top:10px;padding:9px 13px;border-radius:var(--rs);font-size:.88rem;line-height:1.5}
.fb.show{display:block}
.fb.ok{background:#E8F5E9;border-left:3px solid var(--ok);color:var(--ok)}
.fb.ng{background:#FDECEA;border-left:3px solid var(--ng);color:var(--ng)}
.scorebar{background:var(--ink);color:#fff;border-radius:var(--r);padding:15px 18px;text-align:center;margin-top:18px;display:none}
.scorebar.show{display:block}
.scorebar .sn{font-family:'IBM Plex Mono',monospace;font-size:1.9rem;color:var(--gold2);font-weight:500}
.scorebar .sl{font-size:.76rem;opacity:.65;margin-top:3px}
.rbtn{margin-top:9px;padding:7px 18px;background:transparent;border:1.5px solid var(--gold);color:var(--gold2);border-radius:20px;font-family:'IBM Plex Mono',monospace;font-size:.67rem;cursor:pointer;letter-spacing:.06em;transition:all .2s}
.rbtn:hover{background:var(--gold);color:var(--ink)}
/* FILL */
.fq{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:16px 16px;margin-bottom:9px;box-shadow:0 1px 4px var(--shad)}
.fqn{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:var(--gold);margin-bottom:7px}
.fsen{font-family:'Sarabun',sans-serif;font-size:1.05rem;line-height:1.95;margin-bottom:11px}
.bchips{display:flex;flex-wrap:wrap;gap:6px}
.chip{background:var(--cream-dark);border:1.5px solid var(--border);border-radius:20px;padding:5px 13px;font-family:'Sarabun',sans-serif;font-size:.95rem;cursor:pointer;transition:all .18s;color:var(--ink)}
.chip:hover:not(:disabled){background:var(--teal);color:#fff;border-color:var(--teal)}
.chip.ck{background:#E8F5E9;border-color:var(--ok);color:var(--ok)}
.chip.cn{background:#FDECEA;border-color:var(--ng);color:var(--ng);text-decoration:line-through}
.chip:disabled{cursor:default}
.fanswer{display:none;font-family:'IBM Plex Mono',monospace;font-size:.7rem;color:var(--teal);margin-top:7px}
.fanswer.show{display:block}
/* INFO BOX */
.info{background:var(--cream-dark);border:1px solid var(--border);border-radius:7px;padding:11px 14px;font-size:.76rem;color:var(--ink2);margin-bottom:12px}
.info.teal{background:var(--teal);color:#fff;border:none}
.info.teal strong{color:var(--gold2)}
/* INDEX */
.ix-hero{background:var(--ink);padding:38px 18px 30px;text-align:center}
.ix-hero .brand{font-family:'IBM Plex Mono',monospace;font-size:.67rem;color:var(--gold2);letter-spacing:.15em;margin-bottom:14px}
.ix-hero h1{color:#fff;font-size:2rem;margin-bottom:7px}
.ix-hero .sub{font-family:'Sarabun',sans-serif;color:rgba(255,255,255,.6);font-size:.9rem;margin-bottom:14px}
.cefr{display:inline-block;background:var(--gold);color:var(--ink);font-family:'IBM Plex Mono',monospace;font-size:.62rem;letter-spacing:.1em;padding:3px 11px;border-radius:3px;font-weight:600}
.stats{display:flex;justify-content:center;gap:22px;padding:18px 18px 0;max-width:680px;margin:0 auto}
.stat{text-align:center}
.stat-n{font-family:'IBM Plex Mono',monospace;font-size:1.35rem;color:var(--teal);font-weight:500;display:block}
.stat-l{font-size:.68rem;color:var(--ink2)}
.sdiv{font-family:'IBM Plex Mono',monospace;font-size:.62rem;letter-spacing:.14em;color:var(--gold);padding:22px 15px 9px;max-width:680px;margin:0 auto;text-transform:uppercase}
.lgrid{display:grid;grid-template-columns:1fr 1fr;gap:13px;padding:0 15px;max-width:680px;margin:0 auto}
.lcard{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:19px 15px;text-decoration:none;color:var(--ink);box-shadow:0 2px 8px var(--shad);transition:all .2s;display:block}
.lcard:hover{transform:translateY(-3px);box-shadow:0 6px 20px var(--shad);border-color:var(--teal)}
.lcard .lcn{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:var(--gold);letter-spacing:.11em;margin-bottom:9px}
.lcard .lci{font-size:1.5rem;margin-bottom:9px}
.lcard .lct{font-family:'Sarabun',sans-serif;font-size:.95rem;font-weight:600;color:var(--teal);margin-bottom:3px}
.lcard .lcz{font-size:.85rem;color:var(--ink2)}
.alinks{display:flex;gap:9px;padding:0 15px 30px;max-width:680px;margin:0 auto;flex-wrap:wrap}
.alink{flex:1;min-width:130px;background:var(--cream-dark);border:1px solid var(--border);border-radius:var(--rs);padding:13px 14px;text-decoration:none;color:var(--ink);font-size:.78rem;transition:all .2s}
.alink:hover{background:var(--teal);color:#fff;border-color:var(--teal)}
.alink .al{font-family:'IBM Plex Mono',monospace;font-size:.58rem;color:var(--gold);display:block;margin-bottom:3px}
.alink:hover .al{color:var(--gold2)}
/* APPENDIX */
.atable{width:100%;border-collapse:collapse;font-size:.8rem;background:#fff;border-radius:var(--r);overflow:hidden;box-shadow:0 2px 8px var(--shad);margin-bottom:18px}
.atable th{background:var(--teal);color:#fff;padding:9px 11px;text-align:left;font-size:.67rem;font-family:'IBM Plex Mono',monospace;letter-spacing:.05em}
.atable td{padding:9px 11px;border-bottom:1px solid var(--cream-dark);vertical-align:top}
.atable tr:last-child td{border-bottom:none}
.atable tr:nth-child(even) td{background:var(--cream)}
.atable .tc{font-family:'Sarabun',sans-serif;font-size:.93rem;font-weight:600;color:var(--teal)}
.atable .rc{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:var(--ink2)}
/* anchor offset for nav */
.anchor{display:block;height:0;visibility:hidden}
@media(max-width:400px){.ix-hero h1{font-size:1.55rem}}

/* CONJ COMPACT ROW */
.conj-compact{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:#fff;border:1px solid var(--border);border-radius:var(--rs);margin-bottom:7px;box-shadow:0 1px 3px var(--shad)}
.conj-compact:hover{border-color:var(--teal)}
.cc-left{display:flex;align-items:center;gap:10px}
.cc-thai{font-family:'Sarabun',sans-serif;font-size:1.05rem;font-weight:700;color:var(--teal);cursor:pointer;user-select:none}
.cc-zh{font-size:.88rem;color:var(--ink2)}
.cc-right{display:flex;align-items:center;gap:8px}
.cc-link{font-family:'IBM Plex Mono',monospace;font-size:.6rem;color:var(--gold);text-decoration:none;border:1px solid var(--gold);border-radius:3px;padding:2px 6px;white-space:nowrap}
.cc-link:hover{background:var(--gold);color:var(--ink)}
.conj-compact-label{font-family:'IBM Plex Mono',monospace;font-size:.65rem;letter-spacing:.1em;color:var(--ink2);margin:16px 0 8px;padding:6px 10px;background:var(--cream-dark);border-radius:var(--rs);border-left:3px solid var(--teal)}

/* ── READER BAR ── */
.reader-bar{background:var(--ink);border-radius:var(--rs);padding:10px 14px;margin-bottom:14px;display:flex;flex-direction:column;gap:8px}
.rd-mode-toggle{display:flex;gap:0;background:rgba(255,255,255,.1);border-radius:5px;padding:3px;width:fit-content}
.rd-mode-btn{background:none;border:none;color:rgba(255,255,255,.55);font-family:'IBM Plex Mono',monospace;font-size:.68rem;letter-spacing:.05em;padding:5px 13px;border-radius:4px;cursor:pointer;transition:all .18s}
.rd-mode-btn.active{background:var(--teal);color:#fff}
.rd-mode-btn:hover:not(.active){color:#fff}
.rd-controls{display:flex;align-items:center;flex-wrap:wrap;gap:7px}
.rd-btn{background:none;border:1.5px solid rgba(255,255,255,.3);color:#fff;border-radius:5px;width:36px;height:36px;font-size:.85rem;cursor:pointer;transition:all .18s;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.rd-btn:hover:not(:disabled){background:rgba(255,255,255,.15);border-color:#fff}
.rd-btn:disabled{opacity:.28;cursor:default}
.rd-loop-btn.loop-on{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.rd-speed-wrap{display:flex;align-items:center;gap:5px;margin-left:2px}
.rd-speed-label{font-family:'IBM Plex Mono',monospace;font-size:.6rem;color:rgba(255,255,255,.5);white-space:nowrap}
.rd-speed{width:68px;height:3px;accent-color:var(--gold2);cursor:pointer}
.rd-speed-val{font-family:'IBM Plex Mono',monospace;font-size:.63rem;color:var(--gold2);min-width:34px}
.rd-status{font-family:'IBM Plex Mono',monospace;font-size:.62rem;color:rgba(255,255,255,.4);margin-left:auto;white-space:nowrap}
.para-active{background:rgba(184,134,11,.18);border-radius:5px;padding:2px 4px;margin:-2px -4px;transition:background .3s}

.vthai:hover,.cc-thai:hover{opacity:.75}

/* ── LISTENING TAB ───────────────────────────────────────────── */
.audio-player{background:var(--ink);border-radius:var(--r);padding:16px 18px;margin-bottom:16px}
.audio-player audio{width:100%;height:40px;outline:none;border-radius:6px}
.audio-player audio::-webkit-media-controls-panel{background:var(--ink)}
.audio-label{font-family:'IBM Plex Mono',monospace;font-size:.65rem;color:var(--gold2);letter-spacing:.1em;margin-bottom:8px}

/* transcript */
.transcript-card{background:#fff;border:1px solid var(--border);border-radius:var(--r);padding:20px 18px;margin-bottom:16px;box-shadow:0 2px 6px var(--shad)}
.transcript-card h3{font-size:.95rem;font-weight:700;color:var(--teal);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--cream-dark)}
.transcript-body{font-family:'Sarabun',sans-serif;font-size:1.05rem;line-height:2.1;color:var(--ink)}
.transcript-body p{margin-bottom:.8em}

/* vocab tables */
.vocab-tables{display:flex;flex-direction:column;gap:14px;margin-bottom:16px}
.vtbl{background:#fff;border:1px solid var(--border);border-radius:var(--r);overflow:hidden;box-shadow:0 1px 4px var(--shad)}
.vtbl-head{background:var(--teal);color:#fff;font-family:'IBM Plex Mono',monospace;font-size:.65rem;letter-spacing:.08em;padding:8px 14px}
.vtbl table{width:100%;border-collapse:collapse;font-size:.88rem}
.vtbl td{padding:8px 14px;border-bottom:1px solid var(--cream-dark);vertical-align:middle}
.vtbl tr:last-child td{border-bottom:none}
.vtbl tr:nth-child(even) td{background:var(--cream)}
.vtbl .tw{font-family:'Sarabun',sans-serif;font-size:.98rem;font-weight:600;color:var(--teal);cursor:pointer}
.vtbl .tw:hover{opacity:.75}
.vtbl .zh{font-size:.85rem;color:var(--ink)}

/* vocab words inline in transcript */
.tw-inline{
  color:var(--teal);
  font-weight:600;
  border-bottom:1.5px dashed var(--teal);
  cursor:pointer;
  position:relative;
  -webkit-tap-highlight-color:rgba(0,0,0,0)
}
.tw-inline::after{
  content:attr(title);
  position:absolute;
  bottom:130%;
  left:50%;
  transform:translateX(-50%);
  background:var(--teal);
  color:#fff;
  padding:4px 10px;
  border-radius:5px;
  font-size:.78rem;
  white-space:nowrap;
  font-family:'Sarabun',sans-serif;
  font-weight:500;
  pointer-events:none;
  z-index:10;
  opacity:0;
  transition:opacity .18s
}
.tw-inline:hover::after,
.tw-inline.tip-on::after{opacity:1}