/* ===== Heo Vàng — Claymorphism design system (shared) ===== */
:root{
  --mint:#EAF6F0;
  --cream:#FFFDF7;
  --gold:#F2A900;
  --gold-text:#4A2F00;
  --green:#5BC28A;
  --green-deep:#3FA06C;
  --ink:#2E3A2A;
  --coral:#FF6B5E;
  --coral-deep:#E04E41;
  --premium-bg:#FFF6E5;
  --locked-bg:#F4EFE3;
  --footer-bg:#2E3A2A;
  --footer-text:#EAF6F0;
  --radius-pill:999px;
  --radius-lg:36px;
  --radius-md:26px;
  --radius-sm:16px;
  --fd:'Baloo 2',system-ui,sans-serif;
  --fb:'Nunito',system-ui,sans-serif;

  --sh-sm: 4px 4px 10px rgba(168,140,80,.18), -4px -4px 10px rgba(255,255,255,.85);
  --sh-md: 6px 6px 14px rgba(168,140,80,.2), -5px -5px 12px rgba(255,255,255,.9);
  --sh-lg: 10px 10px 22px rgba(168,140,80,.22), -8px -8px 18px rgba(255,255,255,.9);
  --sh-xl: 14px 14px 30px rgba(168,140,80,.25), -12px -12px 26px rgba(255,255,255,.9);
  --sh-2xl: 16px 16px 32px rgba(168,140,80,.3), -14px -14px 28px rgba(255,255,255,.9);
  --sh-gold: 6px 6px 14px rgba(168,120,20,.3), -4px -4px 10px rgba(255,255,255,.7);
  --sh-gold-lg: 8px 8px 18px rgba(168,120,20,.35), -6px -6px 14px rgba(255,255,255,.7);
  --sh-gold-btn: 6px 6px 14px rgba(168,120,20,.3), -4px -4px 10px rgba(255,255,255,.7), inset 2px 2px 4px rgba(255,255,255,.4), inset -2px -3px 6px rgba(0,0,0,.12);
  --sh-gold-btn-lg: 8px 8px 18px rgba(168,120,20,.35), -6px -6px 14px rgba(255,255,255,.7), inset 2px 2px 4px rgba(255,255,255,.4), inset -2px -3px 6px rgba(0,0,0,.12);
  --sh-coral-btn: 6px 6px 14px rgba(190,60,50,.28), -4px -4px 10px rgba(255,255,255,.7), inset 2px 2px 4px rgba(255,255,255,.35), inset -2px -3px 6px rgba(0,0,0,.12);
  --sh-inset-icon: inset 3px 3px 8px rgba(168,140,80,.2), inset -3px -3px 8px rgba(255,255,255,.9);
  --sh-inset-tab: inset 4px 4px 10px rgba(168,120,20,.3), inset -3px -3px 8px rgba(255,255,255,.3);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--fb);color:var(--ink);background:var(--mint);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
button{font:inherit}
input,select,textarea{font:inherit}
.container{max-width:1240px;margin:0 auto;padding:0 40px}
.container-narrow{max-width:820px;margin:0 auto;padding:0 40px}
.container-article{max-width:760px;margin:0 auto;padding:0 40px}
@media(max-width:640px){.container,.container-narrow,.container-article{padding:0 20px}}
h1,h2,h3{font-family:var(--fd);line-height:1.2}
p{line-height:1.65}
.eyebrow{display:inline-block;background:var(--cream);color:var(--green-deep);padding:9px 20px;border-radius:var(--radius-pill);font-weight:700;font-size:.85rem;box-shadow:var(--sh-sm);margin-bottom:14px}
.eyebrow.muted{color:rgba(46,58,42,.6)}
.eyebrow.solid{background:var(--green);color:#fff;box-shadow:4px 4px 10px rgba(63,160,108,.3),-4px -4px 10px rgba(255,255,255,.7)}
.eyebrow.gold{background:var(--gold);color:var(--gold-text)}
.sec-h2{font-weight:800;font-size:clamp(1.6rem,3.4vw,2.15rem);margin:0 0 26px}
.h1-page{font-weight:800;font-size:clamp(1.9rem,4.6vw,2.6rem);line-height:1.16;margin:8px 0 14px}
.lead{font-size:1.05rem;line-height:1.6;color:rgba(46,58,42,.75);margin-bottom:26px}
.crumb{font-size:.85rem;color:rgba(46,58,42,.55);padding:22px 0 0}
.crumb a{text-decoration:none}
.crumb a:hover{color:var(--green-deep)}

/* ===== Header ===== */
header{position:sticky;top:0;z-index:50;background:rgba(234,246,240,.88);backdrop-filter:blur(10px);box-shadow:0 4px 18px rgba(120,110,70,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 40px;max-width:1240px;margin:0 auto}
@media(max-width:640px){.nav{padding:14px 20px}}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo .badge{width:46px;height:46px;border-radius:50%;background:var(--gold);display:flex;align-items:center;justify-content:center;font-size:1.5rem;box-shadow:var(--sh-gold-btn);flex-shrink:0}
.logo span.name{font-family:var(--fd);font-weight:800;font-size:1.375rem;color:var(--ink)}
.nav-links{display:flex;align-items:center;gap:22px;flex-wrap:wrap;list-style:none}
.nav-links a{text-decoration:none;color:var(--ink);font-weight:700;font-size:.88rem}
.nav-links a:hover{color:var(--green-deep)}
@media(max-width:860px){.nav-links{display:none}}
.btn-premium{text-decoration:none;background:var(--gold);color:var(--gold-text);font-family:var(--fd);font-weight:700;font-size:.88rem;padding:11px 22px;border-radius:var(--radius-pill);white-space:nowrap;box-shadow:var(--sh-gold-btn);border:none;cursor:pointer;transition:transform .15s}
.btn-premium:hover{transform:translateY(-2px)}

/* ===== Buttons ===== */
.btn{display:inline-block;text-decoration:none;font-family:var(--fd);font-weight:700;border-radius:var(--radius-pill);cursor:pointer;transition:transform .15s;border:none}
.btn:hover{transform:translateY(-2px)}
.btn:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.btn-gold{background:var(--gold);color:var(--gold-text);padding:16px 30px;font-size:1rem;box-shadow:var(--sh-gold-btn-lg)}
.btn-gold-sm{background:var(--gold);color:var(--gold-text);padding:12px 24px;font-size:.88rem;box-shadow:var(--sh-gold-btn)}
.btn-coral{background:var(--coral);color:#fff;padding:16px 30px;font-size:1rem;box-shadow:var(--sh-coral-btn)}
.btn-coral-sm{background:var(--coral);color:#fff;padding:12px 24px;font-size:.88rem;box-shadow:var(--sh-coral-btn)}
.btn-outline{background:var(--mint);color:var(--green-deep);padding:16px 30px;font-size:1rem;box-shadow:8px 8px 18px rgba(168,140,80,.18),-6px -6px 14px rgba(255,255,255,.9);border:2px solid rgba(63,160,108,.3)}
.btn-outline-sm{background:var(--mint);color:var(--green-deep);padding:12px 24px;font-size:.88rem;box-shadow:var(--sh-sm);border:2px solid rgba(63,160,108,.3)}
.btn-block{width:100%;text-align:center}
.link-arrow{text-decoration:none;color:var(--green-deep);font-weight:800;font-size:.92rem}
.link-arrow:hover{text-decoration:underline}

/* ===== Generic clay card ===== */
.clay-card{background:var(--cream);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--sh-xl)}
.clay-card-sm{background:var(--cream);border-radius:20px;padding:18px 22px;box-shadow:var(--sh-sm)}
.clay-card-md{background:var(--cream);border-radius:24px;padding:24px 26px;box-shadow:var(--sh-md)}

/* ===== Chips / tags ===== */
.chip{display:inline-block;background:var(--mint);color:var(--ink);font-family:var(--fd);font-weight:700;font-size:.8rem;padding:7px 16px;border-radius:var(--radius-pill);margin:0 6px 6px 0;box-shadow:var(--sh-inset-icon)}

/* ===== Accordion (pillar / faq shared shape) ===== */
.acc-item{background:var(--cream);border-radius:24px;padding:6px;box-shadow:var(--sh-md);margin-bottom:14px}
.acc-head{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 22px;cursor:pointer;background:none;border:none;width:100%;text-align:left;font-family:var(--fd);font-weight:700;font-size:.97rem;color:var(--ink)}
.acc-chev{font-size:1.125rem;color:rgba(46,58,42,.5);transition:transform .2s;flex-shrink:0}
.acc-item.open .acc-chev{transform:rotate(180deg)}
.acc-body{display:none;padding:0 22px 20px;font-size:.9rem;line-height:1.6;color:rgba(46,58,42,.75)}
.acc-item.open .acc-body{display:block}

/* ===== Search bar (tudien / hoi-heo) ===== */
.searchbar{margin:6px 0 20px}
.searchbar input{width:100%;padding:14px 20px;border-radius:var(--radius-pill);border:none;font-family:var(--fb);font-size:1rem;background:var(--cream);box-shadow:var(--sh-inset-icon);color:var(--ink)}
.searchbar input::placeholder{color:rgba(46,58,42,.4)}
.searchbar input:focus{outline:none;box-shadow:var(--sh-inset-icon),0 0 0 3px rgba(242,169,0,.3)}
.tabs-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:22px}
.tab-pill{font-family:var(--fd);font-weight:700;font-size:.85rem;border:none;background:var(--cream);color:rgba(46,58,42,.6);border-radius:var(--radius-pill);padding:9px 18px;cursor:pointer;box-shadow:var(--sh-sm)}
.tab-pill.active{background:var(--gold);color:var(--gold-text);box-shadow:var(--sh-inset-tab)}

/* ===== Vocab table (lesson pages) ===== */
.vocab-table{width:100%;border-collapse:separate;border-spacing:0;background:var(--cream);border-radius:20px;overflow:hidden;box-shadow:var(--sh-md);margin:18px 0}
.vocab-table th{font-family:var(--fd);text-align:left;background:var(--mint);color:var(--green-deep);padding:12px 16px;font-size:.85rem}
.vocab-table td{padding:11px 16px;border-top:1px solid rgba(168,140,80,.12)}
.vocab-table td.ipa{color:rgba(46,58,42,.55);font-style:italic;font-size:.9rem}
.vocab-table td b{font-family:var(--fd);font-size:1rem}

/* ===== Quiz ===== */
.quiz-card{background:var(--cream);border-radius:var(--radius-lg);padding:26px 30px;box-shadow:var(--sh-lg);margin:18px 0}
.quiz-q{margin-bottom:20px}
.quiz-q:last-child{margin-bottom:0}
.quiz-qt{font-family:var(--fd);font-weight:700;font-size:1.02rem;margin-bottom:10px}
.quiz-opts{display:flex;gap:10px;flex-wrap:wrap}
.quiz-opt{font-family:var(--fd);font-weight:700;border:none;background:var(--mint);border-radius:var(--radius-pill);padding:9px 20px;font-size:.9rem;cursor:pointer;box-shadow:var(--sh-sm);transition:transform .12s}
.quiz-opt:hover{transform:translateY(-2px)}
.quiz-opt.ok{background:var(--green);color:#fff;box-shadow:4px 4px 10px rgba(63,160,108,.3)}
.quiz-opt.no{background:#FFD9D4;color:var(--coral-deep);text-decoration:line-through;box-shadow:none}
.quiz-opt:disabled{cursor:default}
.coinbar{font-family:var(--fd);font-weight:800;font-size:1.05rem;text-align:center;background:var(--gold);color:var(--gold-text);border-radius:var(--radius-pill);padding:10px;margin-top:6px;box-shadow:var(--sh-gold-btn)}

/* ===== Story / ask boxes (lesson pages) ===== */
.story-box{background:var(--cream);border-radius:var(--radius-lg);padding:26px 30px;box-shadow:var(--sh-lg)}
.story-box p{margin-bottom:14px;color:var(--ink)}
.story-box p:last-child{margin-bottom:0}
.ask-box{background:var(--mint);border-radius:var(--radius-lg);padding:24px 28px;margin:18px 0;box-shadow:var(--sh-inset-icon)}
.ask-box h3{font-size:1.05rem;margin-bottom:12px}
.ask-box ol{padding-left:22px}
.ask-box li{margin-bottom:8px;font-weight:600}
.video-frame{position:relative;border-radius:26px;overflow:hidden;box-shadow:var(--sh-md);aspect-ratio:16/9;background:linear-gradient(135deg,#3B2A1A,#2E3A2A);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#FFE7A8;gap:6px;text-decoration:none}
.video-frame .playbtn{width:64px;height:64px;border-radius:50%;background:rgba(242,169,0,.92);display:flex;align-items:center;justify-content:center;box-shadow:6px 6px 16px rgba(0,0,0,.25)}
.video-frame .playbtn i{width:0;height:0;border-top:13px solid transparent;border-bottom:13px solid transparent;border-left:20px solid #fff;margin-left:5px;display:block}
.video-frame .cap{font-size:.8rem;font-weight:700}

/* ===== Lock overlay (Season 2 lessons) ===== */
.lock-wrap{position:relative;margin-top:10px}
.locked-content{filter:blur(7px);pointer-events:none;user-select:none}
.lock-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:rgba(234,246,240,.68);border-radius:var(--radius-lg);padding:30px 24px;gap:10px;z-index:5}
.lock-overlay .lock-icon{font-size:2.6rem}
.lock-overlay h3{font-size:1.2rem}
.lock-overlay p{color:rgba(46,58,42,.7);max-width:24rem;margin:0 0 4px;font-size:.92rem}

/* ===== Next / prev nav ===== */
.next-box{display:flex;justify-content:space-between;align-items:center;background:var(--footer-bg);color:var(--footer-text);border-radius:var(--radius-lg);padding:22px 28px;margin:36px 0 0;gap:16px;flex-wrap:wrap}
.next-box .lbl{font-size:.78rem;color:rgba(234,246,240,.65);font-family:var(--fd);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.next-box .name{font-family:var(--fd);font-weight:800;font-size:1.1rem;color:#fff}
.prevlink{font-size:.88rem;margin-top:14px}
.prevlink a{color:rgba(46,58,42,.6);text-decoration:none}
.prevlink a:hover{color:var(--green-deep)}

/* ===== Footer ===== */
footer{background:var(--footer-bg);color:var(--footer-text);border-radius:48px 48px 0 0;padding:56px 40px 30px;margin-top:56px}
footer.footer-simple{padding:30px 20px;text-align:center;font-size:.88rem;border-radius:36px 36px 0 0}
footer.footer-simple a{color:var(--gold);text-decoration:none}
@media(max-width:640px){footer{padding:44px 20px 24px}}
.foot-inner{max-width:1240px;margin:0 auto}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.foot-grid{grid-template-columns:1fr}}
.foot-logo{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.foot-logo .badge{width:38px;height:38px;border-radius:50%;background:var(--gold);display:flex;align-items:center;justify-content:center;font-size:1.25rem}
.foot-logo span{font-family:var(--fd);font-weight:800;font-size:1.19rem;color:#fff}
.foot-desc{font-size:.875rem;line-height:1.6;color:rgba(234,246,240,.65);max-width:280px}
.foot-col-title{font-family:var(--fd);font-weight:700;font-size:.875rem;margin-bottom:14px;color:var(--gold)}
.foot-links{display:flex;flex-direction:column;gap:10px;font-size:.875rem;list-style:none;color:rgba(234,246,240,.75)}
.foot-links a{text-decoration:none;color:inherit}
.foot-links a:hover{color:var(--gold)}
.foot-legal{border-top:1px solid rgba(234,246,240,.15);padding-top:22px;font-size:.8125rem;color:rgba(234,246,240,.5);text-align:center}

/* ===== Modal (Premium) ===== */
.overlay{position:fixed;inset:0;background:rgba(46,58,42,.55);z-index:100;display:none;align-items:center;justify-content:center;padding:20px}
.overlay.show{display:flex}
.modal{background:var(--cream);border-radius:var(--radius-lg);padding:38px;max-width:420px;width:100%;position:relative;box-shadow:20px 20px 40px rgba(0,0,0,.25);max-height:90vh;overflow-y:auto}
.modal .close{position:absolute;top:18px;right:18px;width:34px;height:34px;border-radius:50%;border:none;background:var(--mint);font-size:1rem;cursor:pointer;box-shadow:3px 3px 8px rgba(168,140,80,.2)}
.modal .emoji{font-size:2.5rem;margin-bottom:10px}
.modal h3{font-weight:800;font-size:1.5rem;margin:0 0 10px}
.modal p{font-size:.9rem;line-height:1.6;color:rgba(46,58,42,.75);margin:0 0 20px}

/* ===== Forms (gop-y) ===== */
.field{margin-bottom:18px}
.field label{display:block;font-family:var(--fd);font-weight:700;font-size:.88rem;margin-bottom:6px}
.field .opt{font-weight:400;color:rgba(46,58,42,.55);font-size:.8rem}
.field input[type="text"],.field input[type="email"],.field select,.field textarea{width:100%;padding:13px 16px;border-radius:16px;border:none;font-family:var(--fb);font-size:1rem;background:var(--mint);color:var(--ink);box-shadow:var(--sh-inset-icon)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;box-shadow:var(--sh-inset-icon),0 0 0 3px rgba(242,169,0,.3)}
.field textarea{resize:vertical;min-height:120px}
.hp{position:absolute;left:-9999px;top:-9999px}

/* ===== Timeline (cap-nhat) ===== */
.timeline{position:relative}
.tl-entry{position:relative;padding:0 0 34px 46px}
.tl-entry::before{content:"";position:absolute;left:11px;top:6px;bottom:-4px;width:3px;background:rgba(168,140,80,.25);border-radius:99px}
.tl-entry:last-child::before{display:none}
.tl-dot{position:absolute;left:0;top:2px;width:24px;height:24px;border-radius:50%;background:var(--gold);display:flex;align-items:center;justify-content:center;font-size:.85rem}
.tl-date{font-family:var(--fd);font-weight:700;font-size:.8rem;color:var(--green-deep);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px}
.tl-tag{display:inline-block;font-family:var(--fd);font-weight:700;font-size:.7rem;text-transform:uppercase;letter-spacing:.03em;padding:3px 10px;border-radius:var(--radius-pill);margin-bottom:8px}
.tl-tag.new{background:#DFF3E8;color:var(--green-deep)}
.tl-tag.premium{background:var(--premium-bg);color:#C97F00}
.tl-tag.launch{background:#FFE0DC;color:var(--coral-deep)}

@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}