:root{
  --bg:#2A3439;--bg-deep:#32403F;--bg-card:#3D8C8F;--bg-card2:#4B9DA0;
  --gold:#9FE3D6;--gold-soft:#CFF3EB;--gold-dim:#9FE3D6;
  --gold-line:rgba(255,255,255,.16);--gold-glow:rgba(159,227,214,.1);
  --ivory:#F1F6F5;--ivory-dim:#B9CAC8;--ivory-sub:#B9CAC8;
  --green:#7ED89B;--green-dim:rgba(126,216,155,.18);
  --red:#F0838C;--red-dim:rgba(240,131,140,.16);
  --font-th:'Sarabun',sans-serif;
  --font-en:'Inter',sans-serif;
  --font-cn:'Noto Sans SC',sans-serif;
  --font-display: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --radius:14px;
}
.card,.sentence-block,.class-card,.vowel-card,.tone-card,.review-cell,.recap-card,.snd-cell,.gender-pair,.phrase-card,.compare-box,.flash-card{
  --ivory:#FFFFFF;--ivory-dim:#C8ECEE;--ivory-sub:#C8ECEE;
  --gold:#C8ECEE;--gold-soft:#FFFFFF;--gold-dim:#C8ECEE;
  --gold-line:rgba(255,255,255,.2);--gold-glow:rgba(255,255,255,.08);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ivory);font-family:var(--font-en);font-weight:300;line-height:1.7;min-height:100vh;overflow-x:hidden}
.page{position:relative;z-index:1}
.wrap{max-width:900px;margin:0 auto;padding:0 clamp(20px,5vw,48px)}
.th{font-family:var(--font-th)}

[data-lang]{display:none}
body.lang-cn [data-lang="cn"],body.lang-en [data-lang="en"]{display:block}
span[data-lang]{display:none}
body.lang-cn span[data-lang="cn"],body.lang-en span[data-lang="en"]{display:inline}

/* NAV */
nav{position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:1px solid var(--gold-line);padding:16px 0}
.nav-inner{max-width:900px;margin:0 auto;padding:0 clamp(20px,5vw,48px);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.nav-left{display:flex;align-items:center;gap:12px}
.nav-back{display:flex;align-items:center;gap:6px;color:var(--ivory-sub);font-family:var(--font-en);font-size:13px;text-decoration:none;transition:color .2s;white-space:nowrap}
.nav-back:hover{color:var(--gold)}
.nav-back svg{width:14px;height:14px;flex:none}
.nav-logo{height:133px;width:auto;display:block}
@media(max-width:480px){.nav-logo{height:84px}}
.nav-logo-link{display:block;cursor:pointer}
.lang-switch{display:flex;align-items:center;gap:4px;background:rgba(61,140,143,.06);border:1px solid var(--gold-line);border-radius:100px;padding:4px}
.lang-btn{padding:6px 14px;border-radius:100px;border:none;background:none;cursor:pointer;font-family:var(--font-en);font-size:12.5px;font-weight:600;letter-spacing:.04em;color:var(--ivory-dim);transition:all .2s}
.lang-btn.active{background:var(--gold-dim);color:#fff}

/* HERO */
.hero{padding:clamp(52px,8vw,88px) 0 clamp(40px,6vw,64px);border-bottom:1px solid var(--gold-line)}
.eyebrow{font-family:var(--font-en);font-size:10.5px;font-weight:500;letter-spacing:.36em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:18px;display:flex;align-items:center;gap:12px}
.eyebrow::before{content:'';width:24px;height:1px;background:var(--gold-dim);flex:none}
.hero h1{font-family:var(--font-display);font-style:normal;font-size:clamp(30px,5.6vw,52px);font-weight:700;color:var(--gold-soft);line-height:1.15;margin-bottom:12px}
body.lang-cn .hero h1,body.lang-cn .sec-title{font-family:var(--font-cn);font-style:normal;font-weight:700}
.hero-sub{font-family:var(--font-en);font-size:clamp(14px,2vw,16px);font-weight:300;color:var(--ivory-dim);max-width:640px;margin-bottom:18px}
.hero-sub[data-lang="cn"]{font-family:var(--font-cn)}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.chip{background:rgba(61,140,143,.08);border:1px solid var(--gold-line);border-radius:8px;padding:6px 12px;font-family:var(--font-en);font-size:12.5px;color:var(--ivory-dim)}
.chip[data-lang="cn"]{font-family:var(--font-cn)}

/* SECTION SHELL */
section{padding:clamp(44px,7vw,76px) 0;border-bottom:1px solid var(--gold-line)}
section:last-of-type{border-bottom:none}
.sec-head{margin-bottom:clamp(24px,4vw,34px)}
.sec-eyebrow{font-family:var(--font-en);font-size:10.5px;font-weight:600;letter-spacing:.3em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:10px}
.sec-title{font-family:var(--font-display);font-style:normal;font-size:clamp(22px,3.6vw,30px);font-weight:700;color:var(--gold-soft);line-height:1.25}
.sec-desc{font-size:14.5px;color:var(--ivory-sub);margin-top:8px;max-width:640px}
.sec-desc[data-lang="cn"]{font-family:var(--font-cn)}

/* LESSON DIVIDER */
.lesson-divider{text-align:center;padding:clamp(40px,7vw,64px) 0}
.lesson-divider .tag{font-family:var(--font-en);font-size:11px;letter-spacing:.4em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:14px}
.lesson-divider h2{font-family:var(--font-display);font-style:normal;font-size:clamp(26px,4.4vw,38px);color:var(--gold-soft);font-weight:700}
body.lang-cn .lesson-divider h2{font-family:var(--font-cn);font-style:normal;font-weight:700}
.lesson-divider p{color:var(--ivory-sub);margin-top:10px;font-size:14px;max-width:520px;margin-left:auto;margin-right:auto}
.lesson-divider p[data-lang="cn"]{font-family:var(--font-cn)}

/* CARD / NOTE */
.card{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:var(--radius);padding:clamp(20px,3vw,30px);margin-bottom:16px}
.grammar-note{margin-top:16px;padding:14px 16px;border-radius:10px;background:rgba(61,140,143,.05);border-left:2px solid var(--gold-dim);font-size:12.5px;color:var(--ivory-sub)}
.grammar-note[data-lang="cn"]{font-family:var(--font-cn)}
.grammar-note b{color:var(--gold-dim);font-weight:500}

/* COMPARE ROW (EN vs TH feeling / meaning) */
.compare-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:560px){.compare-pair{grid-template-columns:1fr}}
.compare-half{background:var(--bg-card2);border:1px solid var(--gold-line);border-radius:12px;padding:16px 18px}
.compare-half .lbl{font-family:var(--font-en);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:8px}
.compare-half .ex-en{font-family:var(--font-en);font-size:14px;color:var(--ivory);margin-bottom:4px}
.compare-half .ex-th{font-family:var(--font-th);font-size:16px;color:var(--ivory);margin-bottom:4px}
.compare-half .note{font-size:12px;color:var(--ivory-sub);margin-top:6px}
.compare-half .note[data-lang="cn"]{font-family:var(--font-cn)}

/* TONE GRID (reference) */
.tone-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:12px;margin-top:18px}
.tone-card{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:12px;padding:18px 12px;text-align:center}
.tone-card .sym{font-family:var(--font-en);font-size:26px;color:var(--gold-soft);margin-bottom:6px}
.tone-card .name{font-family:var(--font-en);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:4px}
.tone-card .desc{font-size:10.5px;color:var(--ivory-sub)}
.tone-card .desc[data-lang="cn"]{font-family:var(--font-cn)}
.tone-card .player{margin-top:10px;justify-content:center}

/* TONE EXAMPLE CARDS (maa with audio) */
.vowel-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-top:18px}
.vowel-card{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:12px;padding:16px;text-align:center}
.vowel-form{font-family:var(--font-th);font-size:26px;color:var(--gold-soft);margin-bottom:4px}
.vowel-rom{font-family:var(--font-en);font-size:12px;color:var(--gold-dim);font-weight:600}
.vowel-ex{font-size:11px;color:var(--ivory-sub);opacity:.85;margin-top:3px}
.vowel-card .player{margin-top:10px;justify-content:center}

/* SOUND GRID (Paiboon initial / vowel / final tables) */
.snd-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:16px}
.snd-cell{background:var(--bg-card2);border:1px solid var(--gold-line);border-radius:9px;padding:12px 14px}
.snd-sym{font-family:var(--font-en);font-size:19px;font-weight:600;color:var(--gold-soft)}
.snd-ex{font-size:11px;color:var(--ivory-sub);margin-top:3px}
.snd-cell .player{margin-top:8px;justify-content:center}

/* TONE TABLE */
.tone-table-wrap{overflow-x:auto;margin-top:16px}
table.tone-table{width:100%;border-collapse:collapse;min-width:480px}
table.tone-table th{font-family:var(--font-en);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-dim);padding:8px 6px;border-bottom:1px solid var(--gold-line);text-align:center}
table.tone-table td{text-align:center;padding:10px 6px;border-bottom:1px solid rgba(61,140,143,.08);font-size:13px}
table.tone-table td.row-head{font-family:var(--font-en);font-size:12px;color:var(--ivory-dim);text-align:left}
.tone-cell-th{font-family:var(--font-th);font-size:16px;color:var(--ivory)}

/* dt/t & bp/p COMPARISON */
.compare-box{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:var(--radius);padding:20px;margin-top:16px}
.compare-box .row{display:flex;align-items:center;gap:12px;padding:8px 0}
.compare-box .row + .row{border-top:1px solid var(--gold-line)}
.compare-box .mark{width:22px;font-size:15px;flex:none;text-align:center}
.compare-box .mark.no{color:var(--red)}
.compare-box .mark.yes{color:var(--green)}
.compare-box .lbl2{font-family:var(--font-en);font-size:13.5px;color:var(--ivory)}
.compare-box .lbl2 b{color:var(--gold-soft)}
.compare-box .sub2{font-size:12px;color:var(--ivory-sub);margin-left:auto;text-align:right}
.compare-box .sub2[data-lang="cn"]{font-family:var(--font-cn)}

/* WORD-BY-WORD BREAKDOWN */
.sentence-block{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:var(--radius);padding:20px 22px;margin-top:14px}
.word-grid{display:flex;flex-wrap:wrap;gap:0;margin-bottom:14px}
.word-cell{flex:1;min-width:78px;text-align:center;padding:8px 6px;border-right:1px solid var(--gold-line)}
.word-cell:last-child{border-right:none}
.word-th{font-family:var(--font-th);font-size:17px;color:var(--gold-soft)}
.word-rom{font-family:var(--font-en);font-size:10.5px;color:var(--ivory-sub);margin-top:3px}
.word-en{font-family:var(--font-en);font-size:10px;color:var(--ivory-sub);margin-top:2px;opacity:.75}
.sentence-full{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding-top:12px;border-top:1px solid var(--gold-line)}
.sentence-th{font-family:var(--font-th);font-size:16px;color:var(--ivory)}
.sentence-en{font-family:var(--font-en);font-size:12.5px;color:var(--ivory-sub);margin-top:2px}

/* FLASHCARDS (Learn the word first) */
.flash-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-top:16px}
.flash-card{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:12px;padding:16px;text-align:center}
.flash-th{font-family:var(--font-th);font-size:18px;color:var(--gold-soft)}
.flash-rom{font-family:var(--font-en);font-size:11.5px;color:var(--gold-dim);margin-top:3px;font-weight:600}
.flash-en{font-size:11px;color:var(--ivory-sub);margin-top:3px}
.flash-card .player{margin-top:10px;justify-content:center}

/* GENDER PAIR (Female / Male audio) */
.gender-pair-wrap{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:var(--radius);padding:20px 22px;margin-top:14px}
.gp-question{font-family:var(--font-th);font-size:20px;color:var(--gold-soft);margin-bottom:2px}
.gp-rom{font-family:var(--font-en);font-size:12.5px;color:var(--gold-dim);font-weight:600;margin-bottom:2px}
.gp-en{font-size:12.5px;color:var(--ivory-sub);margin-bottom:14px}
.gp-en[data-lang="cn"]{font-family:var(--font-cn)}
.gender-pair{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:520px){.gender-pair{grid-template-columns:1fr}}
.gp-col{background:rgba(255,255,255,.05);border:1px solid var(--gold-line);border-radius:10px;padding:12px 14px}
.gp-col .gp-label{font-family:var(--font-en);font-size:10px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:8px;display:flex;align-items:center;gap:6px}
.gp-col.f .gp-label{color:#E8A0BE}
.gp-col.m .gp-label{color:#7FB6E0}

/* PHRASE CARDS (Part 5) */
.phrase-card{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:var(--radius);padding:22px;margin-bottom:16px}
.phrase-en{font-family:var(--font-en);font-size:15px;font-weight:500;color:var(--ivory);margin-bottom:2px}
.phrase-en[data-lang="cn"]{font-family:var(--font-cn)}
.phrase-note{font-size:12px;color:var(--ivory-sub);margin-bottom:12px}
.phrase-note[data-lang="cn"]{font-family:var(--font-cn)}
.phrase-gloss{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:12px}
.pg-word{text-align:center}
.pg-th{font-family:var(--font-en);font-size:12px;color:var(--ivory-sub)}
.pg-en{font-family:var(--font-en);font-size:9.5px;color:var(--ivory-sub);opacity:.55;margin-top:2px}

/* RECAP / REVIEW */
.recap-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:18px}
.recap-card{background:var(--bg-card);border:1px solid var(--gold-line);border-radius:var(--radius);padding:20px}
.recap-card h4{font-family:var(--font-en);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:10px}
.recap-card h4[data-lang="cn"]{font-family:var(--font-cn);letter-spacing:.06em}
.recap-card p{font-family:var(--font-th);font-size:17px;color:var(--ivory)}
.recap-card p.small{font-family:var(--font-en);font-size:14px}
.recap-card .player{margin-top:10px}

/* CLOSING */
.closing-card{position:relative;overflow:hidden;background:none;border:none;padding:clamp(56px,10vw,112px) 20px;text-align:center}
.closing-card::before{content:"";position:absolute;top:50%;left:50%;width:min(560px,90vw);height:min(560px,90vw);transform:translate(-50%,-50%);background:radial-gradient(circle,var(--gold-glow) 0%,transparent 68%);pointer-events:none;z-index:0}
.closing-icon{position:relative;z-index:1;display:flex;justify-content:center;margin-bottom:20px;color:var(--gold);opacity:0;animation:closingFade .8s ease forwards}
.closing-icon svg{width:30px;height:30px}
.closing-card h3{position:relative;z-index:1;font-family:var(--font-display);font-style:normal;font-weight:700;letter-spacing:.03em;margin:0 auto;opacity:0;animation:closingFade .9s ease forwards}
.closing-card h3:first-of-type{font-size:clamp(30px,5.6vw,50px);background:linear-gradient(135deg,var(--gold) 0%,var(--gold-soft) 55%,var(--ivory) 100%);-webkit-background-clip:text;background-clip:text;color:transparent;animation-delay:.05s}
.closing-card h3:last-of-type{margin-top:16px;font-size:clamp(18px,3.1vw,27px);font-weight:500;color:var(--ivory-dim);letter-spacing:.01em;max-width:600px;animation-delay:.28s}
body.lang-cn .closing-card h3{font-family:var(--font-cn);font-style:normal}
body.lang-cn .closing-card h3:last-of-type{font-weight:400}
.closing-cta{position:relative;z-index:1;display:inline-flex;align-items:center;gap:8px;margin-top:28px;padding:12px 28px;border-radius:100px;border:1px solid var(--gold-line);background:rgba(255,255,255,.06);color:var(--gold-soft);font-family:var(--font-en);font-size:14px;font-weight:600;text-decoration:none;opacity:0;animation:closingFade .9s ease forwards;animation-delay:.4s;transition:all .2s}
.closing-cta:hover{border-color:var(--gold);background:var(--gold-glow)}
.closing-cta svg{width:15px;height:15px}
body.lang-cn .closing-cta{font-family:var(--font-cn)}
.closing-divider{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;gap:12px;margin:22px auto 0;opacity:0;animation:closingFade .9s ease forwards;animation-delay:.16s}
.closing-divider i{width:34px;height:1px;background:linear-gradient(90deg,transparent,var(--gold-line),transparent)}
.closing-divider b{width:5px;height:5px;border-radius:50%;background:var(--gold-dim);font-size:0}
@keyframes closingFade{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

/* AUDIO PLAYER (reused pill component) */
.player{display:inline-flex;align-items:center;gap:10px;background:rgba(61,140,143,.06);border:1px solid var(--gold-line);border-radius:100px;padding:5px 14px 5px 5px}
.play-pause{width:30px;height:30px;border-radius:50%;border:none;cursor:pointer;background:var(--gold);color:var(--bg-deep);display:grid;place-items:center;flex:none;transition:all .2s}
.play-pause:hover{background:var(--gold-soft);transform:scale(1.05)}
.play-pause.playing{background:var(--ivory);color:var(--bg-deep)}
.play-pause svg{width:13px;height:13px}
.player-info{min-width:70px}
.player-time{font-family:var(--font-en);font-size:10.5px;color:var(--ivory-sub);white-space:nowrap;display:block}
.player-progress{width:100%;height:3px;background:rgba(61,140,143,.15);border-radius:100px;cursor:pointer;margin-top:4px;position:relative;display:block}
.player-progress-fill{height:100%;background:var(--gold);border-radius:100px;pointer-events:none;display:block}
.player.sm{padding:3px 3px}
.player.sm .player-info{display:none}
.player.sm .play-pause{width:26px;height:26px}
.player.sm .play-pause svg{width:11px;height:11px}

/* FOOTER */
footer{padding:40px 0;text-align:center;color:var(--ivory-sub);font-size:11.5px}

.like-widget{position:fixed;right:18px;bottom:86px;z-index:60;display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--gold-line);border-radius:100px;padding:8px 14px;box-shadow:0 6px 22px rgba(0,0,0,.10)}
.like-btn{width:28px;height:28px;border:none;background:none;cursor:pointer;color:var(--gold-dim);display:grid;place-items:center;padding:0;transition:transform .15s}
.like-btn:hover{transform:scale(1.12)}
.like-btn:active{transform:scale(.9)}
.like-btn svg{width:19px;height:19px}
.like-icon-filled{display:none;color:#E0555F}
.like-btn.liked .like-icon-outline{display:none}
.like-btn.liked .like-icon-filled{display:block}
.like-count{font-family:var(--font-en);font-size:13px;color:var(--ivory-dim);min-width:12px;text-align:left}
@media(max-width:480px){.like-widget{right:12px;bottom:78px;padding:7px 12px}}

/* Force ALL Thai text to Sarabun Light, site-wide */
[data-lang="th"],[lang="th"],.lang-th,.th{font-family:var(--font-th) !important;font-weight:300 !important;font-style:normal !important;}