/* ---------- tokens ---------- */
:root{
  --paper:#FFF4E4; --paper-2:#FBE6C9; --card:#FFFFFF;
  --ink:#1D1A22; --ink-soft:#4B4555; --muted:#7A7284;
  --shadow:#1D1A22; --dot:rgba(29,26,34,.13);
  --a2:#5EDC9A; --a2-tint:#DDF7E8;
  --b1:#FFC738; --b1-tint:#FFF0C4;
  --b2:#FF8DB8; --b2-tint:#FFE1EC;
  --tomato:#FF5B37; --lilac:#A98BFF; --sky:#7CC8FF; --sky-tint:#DDF0FF;
  --stage:#1D1A22; --stage-text:#FFF4E4;
  --on-color:#1D1A22;
  --bw:3px; --radius:22px;
  --sh:5px 5px 0 var(--shadow); --sh-lg:9px 9px 0 var(--shadow);
  --spring:cubic-bezier(.34,1.56,.64,1); --out:cubic-bezier(.22,1,.36,1);
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#16141B; --paper-2:#221F29; --card:#25222D;
    --ink:#FFF1DE; --ink-soft:#DCD2C4; --muted:#A89FB2;
    --shadow:#FFF1DE; --dot:rgba(255,241,222,.08);
    --a2-tint:#183327; --b1-tint:#352C14; --b2-tint:#3A1C2A; --sky-tint:#16283A;
    --stage:#0C0B10; --stage-text:#FFF1DE; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#16141B; --paper-2:#221F29; --card:#25222D;
  --ink:#FFF1DE; --ink-soft:#DCD2C4; --muted:#A89FB2;
  --shadow:#FFF1DE; --dot:rgba(255,241,222,.08);
  --a2-tint:#183327; --b1-tint:#352C14; --b2-tint:#3A1C2A; --sky-tint:#16283A;
  --stage:#0C0B10; --stage-text:#FFF1DE; color-scheme:dark;
}

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:90px}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
.lenis.lenis-smooth [data-lenis-prevent]{overscroll-behavior:contain}
.lenis.lenis-stopped{overflow:hidden}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Bricolage Grotesque",system-ui,sans-serif;font-size:17px;line-height:1.5;transition:background-color .5s,color .5s}
main{overflow-x:clip}
button{font:inherit;color:inherit;cursor:pointer}
a{color:inherit}
:focus-visible{outline:3px dashed var(--tomato);outline-offset:3px}
.ipa{font-family:"Gentium Book Plus","Charis SIL","Doulos SIL","Noto Sans",serif;font-weight:400;letter-spacing:.01em}
.hand{font-family:"Caveat",cursive;font-weight:700}
.wrap{width:min(1180px,100% - 32px);margin-inline:auto}
.section{padding:clamp(80px,11vw,140px) 0;position:relative}

/* section heads */
.sec-head{max-width:720px;margin-bottom:46px}
.sec-head.center{margin-inline:auto;text-align:center}
.eyebrow{display:inline-block;font-weight:800;font-size:.8rem;letter-spacing:.09em;text-transform:uppercase;padding:6px 13px;border:2px solid var(--ink);border-radius:999px;background:var(--card);transform:rotate(-2deg);margin-bottom:16px}
h2{font-size:clamp(2.4rem,6vw,4.4rem);line-height:.98;letter-spacing:-.035em;margin:0 0 14px;font-weight:800}
.sec-head p{font-size:1.15rem;color:var(--ink-soft);margin:0}
.squiggle{position:relative;display:inline-block;white-space:nowrap}
.squiggle svg{position:absolute;left:-2%;bottom:-.16em;width:104%;height:.3em;overflow:visible}
.squiggle path{fill:none;stroke:var(--sq,var(--tomato));stroke-width:5;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 1.1s .35s var(--out)}
.in .squiggle path{stroke-dashoffset:0}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-size:1rem;line-height:1;padding:15px 22px;border:var(--bw) solid var(--ink);border-radius:999px;background:var(--card);color:var(--ink);box-shadow:4px 4px 0 var(--shadow);text-decoration:none;transition:transform .2s var(--spring),box-shadow .2s,background-color .2s}
@media (hover:hover){.btn:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--shadow)}}
.btn:active{transform:translate(3px,3px);box-shadow:1px 1px 0 var(--shadow)}
.btn-primary{background:var(--tomato);color:var(--on-color)}
.btn-ghost{background:transparent;box-shadow:none;border-style:dashed}
.btn[hidden]{display:none}
.speak{width:42px;height:42px;flex:none;border-radius:50%;border:2px solid var(--ink);background:var(--card);color:var(--ink);display:grid;place-items:center;font-size:18px;padding:0;transition:transform .25s var(--spring),background-color .2s}
@media (hover:hover){.speak:hover{transform:scale(1.12) rotate(-8deg);background:var(--b1);color:var(--on-color)}}
.boing{animation:bounce .45s var(--spring)}

/* reveal system */
.js [data-reveal]:not(.in){opacity:0}
[data-reveal].in{animation:revealUp .9s var(--out) backwards;animation-delay:var(--d,0ms)}
[data-reveal="pop"].in{animation-name:revealPop;animation-timing-function:var(--out)}
.js [data-stagger]:not(.in)>*{opacity:0}
[data-stagger].in>*{animation:revealUp .75s var(--out) backwards;animation-delay:calc(var(--i,0) * var(--step,80ms))}
[data-stagger="cards"].in>*{animation-name:cardIn;animation-timing-function:var(--spring)}
[data-stagger].settled>*{animation:none}
.lesson-grid.leaving>*{animation:cardOut .22s var(--out) forwards!important;animation-delay:0s!important}

/* ---------- progress + nav ---------- */
.progress{position:fixed;top:0;left:0;right:0;height:5px;z-index:60;transform-origin:0 50%;transform:scaleX(0);background:linear-gradient(90deg,var(--a2),var(--b1),var(--b2),var(--tomato))}
.nav{position:fixed;top:14px;left:50%;z-index:50;width:min(1120px,100% - 24px);transform:translateX(-50%);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 10px 9px 16px;background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:var(--bw) solid var(--ink);border-radius:999px;box-shadow:4px 4px 0 var(--shadow);transition:transform .55s var(--out),background-color .5s}
.nav.hide{transform:translate(-50%,-150%)}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.35rem;letter-spacing:-.035em;text-decoration:none}
.logo-mark{width:38px;height:38px;border-radius:50%;background:var(--lilac);border:2px solid var(--ink);display:grid;place-items:center;font-size:1.45rem;line-height:1;color:#1D1A22;padding-bottom:4px;transition:transform .6s var(--spring)}
@media (hover:hover){.logo:hover .logo-mark{transform:rotate(360deg) scale(1.1)}}
.logo-dot{color:var(--tomato)}
.nav-links{display:flex;gap:4px}
.nav-links a{text-decoration:none;font-weight:700;padding:8px 14px;border-radius:999px;transition:background-color .25s,color .25s}
@media (hover:hover){.nav-links a:hover{background:var(--paper-2)}}
.nav-links a.active{background:var(--ink);color:var(--paper)}
.nav-right{display:flex;align-items:center;gap:8px}
.accent{position:relative;display:inline-grid;grid-template-columns:1fr 1fr;border:2px solid var(--ink);border-radius:999px;background:var(--card);padding:3px;font-weight:800;font-size:.78rem}
.accent span{position:relative;z-index:1;padding:5px 9px;transition:color .3s}
.accent i{position:absolute;top:3px;bottom:3px;left:3px;width:calc(50% - 3px);border-radius:999px;background:var(--b1);border:2px solid var(--ink);transition:transform .5s var(--spring)}
.accent.us i{transform:translateX(100%)}
.accent:not(.us) span:first-child,.accent.us span:last-child{color:var(--on-color)}
/* Vietnamese help on/off, next to the accent switch (same pill look; filled when on) */
.vi-nav{display:inline-grid;place-items:center;border:2px solid var(--ink);border-radius:999px;background:var(--card);color:var(--ink);padding:3px;font:inherit;font-weight:800;font-size:.78rem;transition:transform .4s var(--spring)}
.vi-nav span{padding:5px 9px;border-radius:999px;border:2px solid transparent;transition:background-color .3s,border-color .3s,color .3s}
.vi-nav.on span{background:var(--b1);border-color:var(--ink);color:var(--on-color)}
@media (hover:hover){.vi-nav:hover{transform:translateY(-2px)}}
.icon-btn{width:40px;height:40px;border-radius:50%;border:2px solid var(--ink);background:var(--card);font-size:18px;display:grid;place-items:center;padding:0;transition:transform .4s var(--spring)}
@media (hover:hover){.icon-btn:hover{transform:rotate(-20deg) scale(1.08)}}
.nav-user{display:flex;align-items:center;gap:8px;border:2px solid var(--ink);background:var(--card);border-radius:999px;padding:3px 12px 3px 3px;font-weight:800;font-size:.9rem}
.avatar{width:72px;height:72px;flex:none;border-radius:50%;display:grid;place-items:center;font-size:38px;border:var(--bw) solid var(--ink);background:var(--pc,var(--b1))}
.avatar.sm{width:32px;height:32px;font-size:17px;border-width:2px}

/* ---------- hero ---------- */
.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;padding:130px 0 90px;overflow:hidden;background-image:radial-gradient(var(--dot) 1.3px,transparent 1.7px);background-size:24px 24px}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.3fr .9fr;gap:40px;align-items:center}
.kicker{font-size:1.75rem;margin:0 0 4px;color:var(--tomato);transform:rotate(-2deg);transform-origin:left}
.h1{font-size:clamp(3.1rem,8.4vw,7.2rem);line-height:.95;letter-spacing:-.045em;margin:0 0 26px;font-weight:800}
.h1 .line{display:block;white-space:nowrap}
.ch{display:inline-block;transition:transform .3s var(--spring)}
.h1 .line .ch{animation:dropIn .9s var(--spring) backwards}
@media (hover:hover){.h1 .line .ch:hover{transform:translateY(-.12em) rotate(-7deg)}}
.rot{position:relative;display:inline-block;vertical-align:top;height:1.08em;margin-top:.1em;background:var(--b1);color:var(--on-color);border:var(--bw) solid var(--ink);border-radius:.16em;box-shadow:6px 6px 0 var(--shadow);transform:rotate(-2deg);overflow:hidden;transition:width .55s var(--spring),background-color .45s}
.rot-word{display:inline-block;padding:0 .14em;line-height:1.02}
.rot-word .ch{animation:letterIn .6s var(--spring) backwards}
.rot-word.out{position:absolute;left:0;top:0;animation:wordOut .4s var(--out) forwards}
.lede{font-size:1.25rem;max-width:36ch;color:var(--ink-soft);margin:0 0 30px}
.cta-row{display:flex;flex-wrap:wrap;gap:14px}
.stats{display:flex;flex-wrap:wrap;gap:30px;margin-top:40px}
.stats b{display:block;font-size:2.2rem;line-height:1;letter-spacing:-.03em}
.stats span{font-size:.9rem;font-weight:600;color:var(--muted)}
.hero-mascot{position:relative;display:grid;place-items:center;padding-top:70px}
.mascot-wrap{width:min(340px,82%);animation:bob 5s ease-in-out infinite;cursor:pointer}
.bubble{position:absolute;top:0;left:-6%;z-index:3;max-width:270px;background:var(--card);border:var(--bw) solid var(--ink);border-radius:20px;padding:13px 16px;box-shadow:var(--sh);font-weight:700;font-size:.98rem;line-height:1.35;transform-origin:80% 100%}
.bubble::after{content:"";position:absolute;bottom:-12px;right:46px;width:20px;height:20px;background:var(--card);border-right:var(--bw) solid var(--ink);border-bottom:var(--bw) solid var(--ink);transform:rotate(45deg)}
.bubble.swap{animation:pop .45s var(--spring)}
.hero-note{position:absolute;bottom:-6px;right:0;font-size:1.45rem;color:var(--ink-soft);transform:rotate(-4deg)}
.scroll-hint{position:absolute;left:50%;bottom:22px;transform:translateX(-50%);font-size:1.4rem;z-index:2;animation:hint 2s ease-in-out infinite}
.glyphs{position:absolute;inset:0;z-index:1;pointer-events:none}
.g{position:absolute;will-change:transform}
.gi{display:grid;place-items:center;width:var(--s);height:var(--s);border:var(--bw) solid var(--ink);border-radius:16px;background:var(--c);color:var(--on-color);font-size:calc(var(--s) * .5);box-shadow:4px 4px 0 var(--shadow);transform:rotate(var(--r));animation:float var(--t,7s) ease-in-out infinite;animation-delay:var(--dl,0s)}

/* ---------- mascot ---------- */
.mascot{display:block;width:100%;height:auto;overflow:visible;filter:drop-shadow(7px 8px 0 var(--shadow))}
.m-body{transform-box:fill-box;transform-origin:50% 100%;animation:squish 3.4s ease-in-out infinite}
.m-blob{fill:var(--lilac);stroke:#1D1A22;stroke-width:6}
.m-shine{fill:none;stroke:#fff;stroke-width:7;stroke-linecap:round;opacity:.6}
.m-white{fill:#fff;stroke:#1D1A22;stroke-width:5}
.m-pupil{fill:#1D1A22}
.m-blink{transform-box:fill-box;transform-origin:center;animation:blink 5s infinite}
.m-cheek{fill:#FF7FAE;opacity:.75}
.m-smile{fill:none;stroke:#1D1A22;stroke-width:6;stroke-linecap:round;transform-box:fill-box;transform-origin:center;transition:transform .3s var(--spring)}
.m-mouth{fill:#7A1F3D;stroke:#1D1A22;stroke-width:5;opacity:0;transform-box:fill-box;transform-origin:center}
.m-schwa{font-family:"Gentium Book Plus",serif;font-size:32px;fill:#1D1A22;opacity:.55}
.talking .m-smile{opacity:0}
.talking .m-mouth{opacity:1;animation:talk .16s ease-in-out infinite alternate}
.sad .m-smile{transform:scaleY(-1) translateY(-4px)}
.mascot.jump{animation:jump .7s var(--spring)}

/* ---------- keyframes ---------- */
/* the loading splash stays in the page after boot (hidden): its bouncing blob must not keep animating behind everything */
html:not(.booting) #boot,html:not(.booting) #boot *{animation:none!important}
/* lazy motion (core.js): a section scrolled out of view stops animating until it comes back */
.off,.off *{animation-play-state:paused!important}
/* calm (core.js): after 8 s without a touch the decorative loops rest; the mouth of a talking mascot and the speaker bars keep going */
html.calm .mascot-wrap,html.calm .m-body,html.calm .m-blink,html.calm .scroll-hint,html.calm .gi,html.calm .play-big::before,html.calm .play-big::after{animation-play-state:paused!important}
@keyframes revealUp{from{opacity:0;transform:translateY(46px) rotate(1.5deg)}to{opacity:1;transform:none}}
@keyframes revealPop{0%{opacity:0;transform:scale(.86) rotate(-3deg)}60%{opacity:1;transform:scale(1.02) rotate(.5deg)}100%{opacity:1;transform:none}}
@keyframes cardIn{from{opacity:0;transform:translateY(50px) rotate(4deg) scale(.94)}to{opacity:1;transform:none}}
@keyframes cardOut{to{opacity:0;transform:translateY(24px) scale(.96) rotate(-1deg)}}
@keyframes dropIn{0%{opacity:0;transform:translateY(-.6em) rotate(-12deg) scale(.6)}100%{opacity:1;transform:none}}
@keyframes letterIn{0%{opacity:0;transform:translateY(.8em) rotate(10deg)}100%{opacity:1;transform:none}}
@keyframes wordOut{to{opacity:0;transform:translateY(-.8em) rotate(-6deg)}}
@keyframes float{0%,100%{transform:rotate(var(--r)) translateY(0)}50%{transform:rotate(calc(var(--r) * -1)) translateY(-14px)}}
@keyframes squish{0%,100%{transform:scale(1,1)}50%{transform:scale(1.035,.965)}}
@keyframes blink{0%,93%,100%{transform:scaleY(1)}96%{transform:scaleY(.08)}}
@keyframes talk{from{transform:scaleY(.3)}to{transform:scaleY(1.05)}}
@keyframes jump{0%{transform:none}35%{transform:translateY(-26px) rotate(-6deg) scale(1.05)}70%{transform:scale(1.06,.94)}100%{transform:none}}
@keyframes wiggle{0%,100%{transform:rotate(0)}25%{transform:rotate(-12deg)}50%{transform:rotate(10deg)}75%{transform:rotate(-6deg)}}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-10px) rotate(-2deg)}40%{transform:translateX(9px) rotate(2deg)}60%{transform:translateX(-6px)}80%{transform:translateX(4px)}}
@keyframes bounce{0%{transform:scale(1)}40%{transform:scale(1.15) rotate(-4deg)}100%{transform:scale(1)}}
@keyframes pop{0%{transform:scale(.6);opacity:0}100%{transform:scale(1);opacity:1}}
@keyframes ripple{0%{transform:scale(1);opacity:.7}100%{transform:scale(1.7);opacity:0}}
@keyframes eq{from{height:12%}to{height:100%}}
@keyframes ringIn{from{stroke-dashoffset:100}}
@keyframes codeIn{0%{opacity:0;transform:translateY(30px) rotate(-10deg) scale(.7)}100%{opacity:1;transform:none}}
@keyframes bob{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-14px) rotate(1.5deg)}}
@keyframes hint{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* ---------- app shell: touch, page fade, nav extras ---------- */
html{-webkit-tap-highlight-color:transparent}
a,button,[role="button"]{touch-action:manipulation}
body{animation:pageIn .45s var(--out)}
html.booting .h1 .line .ch{animation-play-state:paused}
@keyframes pageIn{from{opacity:0}to{opacity:1}}
.nav{top:calc(14px + env(safe-area-inset-top))}
.nav-links .nav-toeic{background:var(--b2);color:var(--on-color);border:2px solid var(--ink);margin-left:4px}
@media (hover:hover){.nav-links .nav-toeic:hover{background:var(--b2);transform:rotate(-3deg)}}

/* ---------- profile sheet (dropdown on desktop, bottom sheet on phones) ---------- */
.sheet{position:fixed;inset:0;z-index:120;visibility:hidden;pointer-events:none;transition:visibility 0s .45s}
.sheet.open{visibility:visible;pointer-events:auto;transition:visibility 0s}
.sheet-backdrop{position:absolute;inset:0;background:rgba(20,16,24,.45);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .3s}
.sheet.open .sheet-backdrop{opacity:1}
.sheet-card{position:absolute;top:calc(84px + env(safe-area-inset-top));right:max(12px,(100vw - 1120px) / 2);width:min(380px,100% - 24px);background:var(--card);border:var(--bw) solid var(--ink);border-radius:24px;box-shadow:var(--sh-lg);padding:18px;transform:translateY(-14px) scale(.96);transform-origin:top right;opacity:0;transition:transform .45s var(--spring),opacity .25s}
.sheet.open .sheet-card{transform:none;opacity:1}
.sheet-grab{display:none}
.sheet-card h3{margin:0 0 12px;font-size:1.3rem;letter-spacing:-.02em}
.sheet-list{display:grid;gap:10px}
.sheet-row{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:10px 12px;border:2px solid var(--ink);border-radius:18px;background:var(--paper);transition:transform .3s var(--spring),background-color .25s}
.sheet-row:active{transform:scale(.97)}
.sheet-row .avatar{width:48px;height:48px;font-size:26px;border-width:2px}
.sheet-row.active{background:var(--pc);color:var(--on-color)}
.sr-main{flex:1;display:flex;flex-direction:column;line-height:1.25}
.sr-main b{font-size:1.1rem}
.sr-main small{font-weight:600;opacity:.75}
.sr-check{font-weight:800;font-size:1.2rem;width:1.2em;text-align:center}
.sheet-install{margin-top:14px;padding-top:14px;border-top:2px dashed var(--ink)}
.sheet-install p{margin:0;font-size:.92rem;line-height:1.4}
.sheet-install .btn{width:100%;justify-content:center}
.app-info{margin:14px 0 0;text-align:center;font-size:.7rem;font-weight:600;color:var(--muted);letter-spacing:.02em}

/* ---------- tab bar: phones, and tablets in either orientation (Xiaomi Pad 7 Pro ≈ 854 × 1280 / 1280 × 854) ---------- */
.tabbar{display:none}
@media (min-width:681px) and (max-width:1024px), (min-width:681px) and (max-width:1400px) and (hover:none) and (pointer:coarse){
  body{padding-bottom:calc(104px + env(safe-area-inset-bottom))}
  .nav-links{display:none}
  .tabbar{position:fixed;left:50%;width:min(600px,calc(100% - 48px));transform:translateX(-50%);bottom:calc(16px + env(safe-area-inset-bottom));z-index:55;display:grid;grid-template-columns:repeat(5,1fr);gap:6px;padding:8px;background:color-mix(in srgb,var(--card) 90%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:var(--bw) solid var(--ink);border-radius:26px;box-shadow:5px 5px 0 var(--shadow)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;gap:2px;min-height:58px;justify-content:center;border-radius:18px;text-decoration:none;font-size:.8rem;font-weight:800;color:var(--ink-soft);transition:background-color .25s,color .25s,transform .3s var(--spring)}
  .tabbar a:active{transform:scale(.94)}
  .tb-icon{transition:transform .4s var(--spring)}
  .tb-icon .ic{width:28px;height:28px}
  .tabbar a.active{background:var(--ink);color:var(--paper)}
  .tabbar a.active .tb-icon{transform:translateY(-2px) scale(1.1)}
}
@media (max-width:680px){
  body{padding-bottom:calc(86px + env(safe-area-inset-bottom))}
  .tabbar{position:fixed;left:10px;right:10px;bottom:calc(10px + env(safe-area-inset-bottom));z-index:55;display:grid;grid-template-columns:repeat(5,1fr);gap:2px;padding:6px;background:color-mix(in srgb,var(--card) 90%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:var(--bw) solid var(--ink);border-radius:24px;box-shadow:4px 4px 0 var(--shadow)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;gap:1px;min-height:48px;justify-content:center;border-radius:16px;text-decoration:none;font-size:.68rem;font-weight:800;color:var(--ink-soft);transition:background-color .25s,color .25s,transform .3s var(--spring)}
  .tabbar a:active{transform:scale(.92)}
  /* a label stays on one line (6 tabs on a narrow phone: "Thanh điệu"); the text shrinks a little with the screen instead */
  .tabbar a{min-width:0}
  .tabbar a>span:not(.tb-icon){white-space:nowrap;font-size:min(1em,2.6vw);letter-spacing:-.02em;max-width:100%;overflow:hidden;text-overflow:clip}
  .tb-icon{font-size:1.3rem;line-height:1.1;transition:transform .4s var(--spring)}
  .tabbar a.active{background:var(--ink);color:var(--paper)}
  .tabbar a.active .tb-icon{transform:translateY(-2px) scale(1.12)}
  .speak{width:44px;height:44px}
  .sheet-card{top:auto;bottom:0;left:0;right:0;width:100%;border-radius:28px 28px 0 0;border-bottom:0;box-shadow:none;padding:12px 18px calc(24px + env(safe-area-inset-bottom));transform:translateY(105%);opacity:1}
  .sheet.open .sheet-card{transform:none}
  .sheet-grab{display:block;width:44px;height:5px;border-radius:9px;background:var(--ink);opacity:.25;margin:0 auto 14px}
}

/* ---------- short screens: phones held sideways (≈ 360–430 px tall) — compact bars, icons-only tab bar ---------- */
@media (max-height:500px) and (orientation:landscape){
  .nav{top:calc(8px + env(safe-area-inset-top));padding-top:5px;padding-bottom:5px}
}
@media (max-height:500px) and (orientation:landscape) and (pointer:coarse){
  body{padding-bottom:calc(62px + env(safe-area-inset-bottom))}
  .tabbar{left:50%;right:auto;width:min(380px,calc(100% - 48px));transform:translateX(-50%);bottom:calc(8px + env(safe-area-inset-bottom));padding:5px;gap:4px;border-radius:20px}
  .tabbar a{min-height:40px;border-radius:14px}
  .tabbar a>span:not(.tb-icon){position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .tb-icon .ic{width:24px;height:24px}
}

/* ---------- voice & accent settings (in the profile sheet) ---------- */
.sheet-card{max-height:calc(100vh - 110px);overflow-y:auto;overscroll-behavior:contain}
.sheet-voice{margin-top:14px;padding-top:14px;border-top:2px dashed var(--ink)}
.sheet-voice h4{margin:0 0 10px;font-size:1rem}
.seg2{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:10px}
#vRate{grid-template-columns:repeat(3,1fr)}
.seg2 button{padding:10px 6px;border:2px solid var(--ink);border-radius:12px;background:var(--paper);color:var(--ink);font-weight:700;font-size:.85rem;transition:background-color .2s,color .2s,transform .25s var(--spring)}
.seg2 button:active{transform:scale(.95)}
.seg2 button.on{background:var(--ink);color:var(--paper)}
.v-row{display:flex;gap:8px;align-items:center;margin-bottom:10px}
.v-row select{flex:1;min-width:0;height:44px;padding:0 10px;border:2px solid var(--ink);border-radius:12px;background:var(--card);color:var(--ink);font:inherit;font-weight:600;font-size:.9rem}
.v-check{display:flex;gap:10px;align-items:center;font-weight:600;font-size:.9rem;cursor:pointer}
.v-check input{width:20px;height:20px;accent-color:var(--tomato)}
.v-hint{font-size:.78rem;color:var(--muted);margin:8px 0 0;line-height:1.4}
.v-ai{align-items:flex-start;margin-bottom:12px}
.v-ai span{display:flex;flex-direction:column;line-height:1.3}
.v-ai small{font-weight:600;color:var(--muted);font-size:.78rem}
.v-more{margin-top:12px;border-top:2px dashed var(--ink);padding-top:10px}
.v-more summary{cursor:pointer;font-weight:700;font-size:.9rem;margin-bottom:10px}
.credits{font-size:.8rem!important;opacity:.7}
@media (max-width:680px){ .sheet-card{max-height:88vh;max-height:88svh} }

/* Vietnamese-help switch (profile sheet) */
.vi-switch{display:flex;align-items:center;gap:12px;margin-top:14px;padding:12px 14px;border:2px solid var(--ink);border-radius:16px;background:var(--paper);cursor:pointer}
.vi-switch span{flex:1;display:flex;flex-direction:column;line-height:1.3}
.vi-switch small{font-weight:600;color:var(--muted);font-size:.8rem}
.vi-switch input{position:absolute;opacity:0;width:1px;height:1px}
.vi-switch i{position:relative;flex:none;width:50px;height:28px;border-radius:999px;border:2px solid var(--ink);background:var(--paper-2);transition:background-color .25s}
.vi-switch i::after{content:"";position:absolute;top:2px;left:2px;width:20px;height:20px;border-radius:50%;background:var(--ink);transition:transform .35s var(--spring)}
.vi-switch input:checked + i{background:var(--tomato)}
.vi-switch input:checked + i::after{transform:translateX(22px);background:#1D1A22}
.vi-switch input:focus-visible + i{outline:3px dashed var(--tomato);outline-offset:3px}

/* ---------- account: avatars, sheet panel ---------- */
.avatar.letter{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:32px;color:#1D1A22}
.avatar.sm.letter{font-size:15px}
.avatar.guest{background:var(--paper-2)}
.acct h3{margin:0 0 6px;font-size:1.3rem;letter-spacing:-.02em}
.acct h4{margin:14px 0 8px;font-size:.95rem}
.acct-note{margin:0 0 12px;font-size:.88rem;color:var(--ink-soft);line-height:1.4}
.acct-form{display:grid;gap:10px;margin-bottom:10px}
.acct-form input{height:48px;padding:0 14px;border:2px solid var(--ink);border-radius:14px;background:var(--card);color:var(--ink);font:inherit;font-weight:600;font-size:1rem}
.acct-form input:focus{outline:3px dashed var(--tomato);outline-offset:2px}
.acct-form .btn{justify-content:center}
.acct-err{min-height:1.2em;margin:0;color:var(--tomato);font-weight:700;font-size:.88rem}
.acct-head{display:flex;align-items:center;gap:12px}
.acct-head .avatar{width:56px;height:56px;font-size:26px}
.acct-head h3{margin:0}
.acct-head small{color:var(--muted);font-weight:700}
.acct-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:14px 0 4px}
.acct-stats div{border:2px solid var(--ink);border-radius:12px;padding:8px 4px;text-align:center;background:var(--paper)}
.acct-stats b{display:block;font-size:1.15rem;line-height:1.1}
.acct-stats span{font-size:.68rem;font-weight:700;color:var(--muted)}
.acct-hist{list-style:none;margin:0;padding:0;display:grid;gap:6px;max-height:260px;overflow-y:auto}
.acct-hist li{display:flex;gap:10px;align-items:center;padding:8px 10px;border-radius:12px;background:var(--paper)}
.ah-i{font-size:1.1rem}
.ah-main{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.ah-main b{font-size:.88rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ah-main small{color:var(--muted);font-weight:600;font-size:.75rem}
.acct-empty{color:var(--muted);font-weight:600;font-size:.88rem;margin:0}
.acct-pw{margin-top:14px;border:2px solid var(--ink);border-radius:14px;padding:10px 12px;background:var(--paper)}
.acct-pw summary{cursor:pointer;font-weight:700}
.acct-pw form{margin-top:10px}
.acct-out{width:100%;justify-content:center;margin-top:12px}

/* ---------- icons (icons.js: Phosphor bold outline over a duotone fill) ---------- */
.ic{width:1.2em;height:1.2em;flex:none;display:inline-block;vertical-align:-.22em;fill:currentColor}
.ic .d{fill:var(--ic-fill,currentColor);opacity:var(--ic-op,.2)}
.ic.pop .d{fill:var(--ic-fill,var(--b1));opacity:1}
.c-a2{--ic-fill:var(--a2)}.c-b1{--ic-fill:var(--b1)}.c-b2{--ic-fill:var(--b2)}.c-sky{--ic-fill:var(--sky)}
.c-lilac{--ic-fill:var(--lilac)}.c-tomato{--ic-fill:var(--tomato)}.c-white{--ic-fill:#fff}
.btn .ic{width:1.3em;height:1.3em;margin:-.2em 0}
.icon-btn .ic,.speak .ic{width:22px;height:22px}
.nav-toeic .ic{width:1.25em;height:1.25em;margin-left:3px}
.avatar .ic{width:60%;height:60%}
.avatar.guest{color:var(--ink)}
.nu-streak{display:inline-flex;align-items:center;gap:1px}
.status .ic{width:1.1em;height:1.1em;margin-right:3px}
.toast .ic{width:1.4em;height:1.4em;margin-right:7px}
.ah-i{display:grid;place-items:center}
.ah-i .ic{width:22px;height:22px}
.tb-icon{display:grid;place-items:center;line-height:0}
.tb-icon .ic{width:25px;height:25px}
.tabbar a.active .ic .d{fill:var(--tb-c,var(--b1));opacity:1}
.tabbar [data-tab="learn"]{--tb-c:var(--a2)}.tabbar [data-tab="toeic"]{--tb-c:var(--b2)}.tabbar [data-tab="sounds"]{--tb-c:var(--sky)}
.tabbar [data-tab="grammar"]{--tb-c:var(--lilac)}.tabbar [data-tab="words"]{--tb-c:var(--b1)}
.vi-switch b .ic,.sheet-voice h4 .ic,.sheet-install .ic{margin-right:5px}
.acc-code{display:inline-grid;place-items:center;font-size:.64rem;font-weight:800;line-height:1;padding:3px 5px;border:2px solid currentColor;border-radius:6px;margin-right:6px}
.ic.flat .d{display:none}

/* ---------- landscape: size the hero headline by height too, so its buttons stay in view above the tab bar ---------- */
@media (orientation:landscape) and (max-height:860px){
  .h1{font-size:clamp(2.4rem,min(8.4vw,10vh),7.2rem)}
}
@media (min-width:681px) and (max-width:1024px), (min-width:681px) and (max-width:1400px) and (hover:none) and (pointer:coarse){
  .hero{padding-top:110px;padding-bottom:130px}
}

/* ---------- getting started (start.js) + one clear next step ---------- */
.start{position:fixed;inset:0;z-index:150;display:flex;flex-direction:column;background:var(--paper);background-image:radial-gradient(var(--dot) 1.3px,transparent 1.7px);background-size:24px 24px;opacity:0;transform:translateY(18px);transition:opacity .3s var(--out),transform .45s var(--out)}
.start.open{opacity:1;transform:none}
.start[hidden]{display:none}
.st-top{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;max-width:640px;margin:0 auto;padding:calc(12px + env(safe-area-inset-top)) 16px 6px}
.st-back{width:44px;height:44px;flex:none;display:grid;place-items:center;padding:0;border-radius:50%;border:2px solid var(--ink);background:var(--card);color:var(--ink)}
.st-back .ic{width:20px;height:20px}
.st-dots{display:flex;gap:6px}
.st-dots i{width:26px;height:9px;border-radius:9px;border:2px solid var(--ink);background:var(--card);transition:background-color .3s}
.st-dots i.on{background:var(--tomato)}
.st-body{flex:1;overflow-y:auto;overscroll-behavior:contain;width:100%;max-width:640px;margin:0 auto;padding:10px 16px 24px}
.st-kick{display:inline-block;font-weight:800;font-size:.78rem;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin:10px 0 6px}
.st-body h2{font-size:clamp(1.8rem,6.5vw,2.6rem);line-height:1.05;letter-spacing:-.03em;margin:0 0 18px}
.st-opts{display:grid;gap:12px}
.st-opt{display:flex;align-items:center;gap:14px;width:100%;text-align:left;padding:14px 16px;border:var(--bw) solid var(--ink);border-radius:22px;background:var(--card);color:var(--ink);box-shadow:5px 5px 0 var(--shadow);transition:transform .3s var(--spring),box-shadow .3s;animation:revealUp .45s var(--out) backwards}
.st-opt:nth-child(2){animation-delay:.06s}.st-opt:nth-child(3){animation-delay:.12s}.st-opt:nth-child(4){animation-delay:.18s}.st-opt:nth-child(5){animation-delay:.24s}
.st-opt:active{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--shadow)}
@media (hover:hover){.st-opt:hover{transform:translate(-2px,-2px);box-shadow:7px 7px 0 var(--shadow)}}
.st-ic{width:54px;height:54px;flex:none;display:grid;place-items:center;border-radius:16px;border:2px solid var(--ink);background:var(--oc,var(--b1));color:#1D1A22}
.st-ic .ic{width:30px;height:30px}
.st-lv{font-weight:800;font-size:1.2rem;letter-spacing:-.02em}
.st-txt{display:flex;flex-direction:column;gap:3px;min-width:0}
.st-txt b{font-size:1.1rem;line-height:1.2}
.st-txt small{color:var(--ink-soft);font-weight:600;font-size:.88rem;line-height:1.35}
.st-note{color:var(--muted);font-weight:600;font-size:.86rem;line-height:1.45;margin:16px 2px 0}
.st-plan{font-weight:600;color:var(--ink-soft);line-height:1.5;margin:0 0 18px}
.st-first{display:flex;gap:14px;align-items:center;padding:16px;border:var(--bw) solid var(--ink);border-radius:22px;background:var(--card);box-shadow:5px 5px 0 var(--shadow);margin-bottom:20px}
.st-first .st-ic{width:62px;height:62px;border-radius:50%;background:var(--card);color:var(--ink)}
.st-first small{display:block;font-weight:800;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.st-first b{display:block;font-size:1.15rem;line-height:1.25;margin:2px 0 4px}
.st-meta{display:inline-flex;align-items:center;gap:5px;font-size:.85rem;color:var(--ink-soft);font-weight:600}
.st-start{width:100%;justify-content:center;padding:17px 22px;font-size:1.05rem}
.st-skip{align-self:center;margin:0 0 calc(12px + env(safe-area-inset-bottom));padding:10px;background:none;border:0;color:var(--ink-soft);font-weight:700;text-decoration:underline;text-underline-offset:3px}
.cta-next{margin:0 0 12px;font-weight:600;color:var(--ink-soft);font-size:.95rem}
.cta-next:empty{display:none}
.cta-next b{color:var(--ink)}
.me-next{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:4px 0 14px;padding:12px 14px;border:2px dashed var(--ink);border-radius:16px;background:var(--paper)}
.me-next span{flex:1;min-width:170px;font-weight:600;color:var(--ink-soft);line-height:1.35}
.me-next b{color:var(--ink)}
.acct-goal{width:100%;justify-content:center;margin:12px 0 0}
@media (max-height:500px) and (orientation:landscape){
  .st-body h2{font-size:1.5rem;margin-bottom:10px}
  .st-opt{padding:9px 12px}
  .st-ic{width:42px;height:42px}
}

/* "Get started": the TOEIC target question */
.st-targets .st-opt{padding:10px 14px}
.st-targets .st-ic{width:60px;height:46px;border-radius:14px}
.st-opt[aria-current="true"]{outline:3px solid var(--tomato);outline-offset:2px}

/* hidden parts of the shared settings sheet (e.g. the accent switch in Mouthful 中文) */
.sheet [hidden]{display:none!important}
.nav-links .nav-zh{background:var(--lilac);color:#1D1A22;border:2px solid var(--ink);margin-left:4px}
.nav-zh .ic{width:1.2em;height:1.2em;margin-left:3px}

/* push notifications (account sheet) */
.acct-push{margin-top:14px;padding:12px;border:2px solid var(--ink);border-radius:14px;background:var(--paper)}
.acct-push:empty{display:none}
.acct-push .v-ai{margin-bottom:0}
.acct-push b .ic,.acct-admin h4 .ic{margin-right:5px}
.acct-admin{margin:12px 0 0;padding-top:12px;border-top:2px dashed var(--ink)}
.acct-admin:first-child{margin-top:0;padding-top:0;border-top:0}
.acct-admin h4{margin:0}
.acct-admin h4 em{font-style:normal;font-size:.7rem;font-weight:800;padding:2px 8px;border-radius:999px;background:var(--ink);color:var(--paper);vertical-align:middle;margin-left:6px;letter-spacing:.04em;text-transform:uppercase}
.acct-admin .v-hint{margin:0}

/* interface language picker (Mouthful 中文 settings sheet) */
.sheet-lang{margin-top:14px;padding-top:14px;border-top:2px dashed var(--ink)}
.sheet-lang h4{margin:0 0 10px;font-size:1rem}
.sheet-lang h4 .ic{margin-right:5px}

/* phones and tablets: a long press neither opens the browser's "right-click" menu nor selects text (the user asked, 2026-10-28); fields still can */
@media (hover:none),(pointer:coarse){
  html{-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}
  input,textarea,[contenteditable],[contenteditable] *{-webkit-touch-callout:default;-webkit-user-select:text;user-select:text}
  img,svg,a{-webkit-user-drag:none}
}

/* the top bar on one line (desktop): labels never wrap ("Bài học", "Đăng nhập"), the app pills keep their icon beside the text;
   between the tablet tab bar and a wide screen everything tightens and the account button shows only its avatar */
.nav-links a,.nav-user,.nav-right>*{white-space:nowrap}
.nav-links a{display:inline-flex;align-items:center;gap:6px}
.nav-links a .ic{width:1.05em;height:1.05em}
@media (min-width:1025px) and (max-width:1480px){
  .nav{gap:8px;padding-left:12px}
  .nav-links{gap:2px}
  .nav-links a{padding:7px 9px;font-size:.92rem}
  .nav-right{gap:6px}
  .nav-user .nu-name{display:none}
  .nav-user{padding:3px}
}
@media (min-width:1025px) and (max-width:1160px){ .nav .logo-text{display:none} .nav-links a{padding:7px 7px;font-size:.88rem} }