/* Bulgarian Alphabet UI v2 — one final, mobile-first component layer. */
:root{--ui-content:920px;--ui-radius:22px;--ui-radius-sm:15px;--ui-tap:48px;--ui-shadow:0 12px 34px rgba(31,38,33,.08)}
.app-main{width:min(calc(100% - 28px),var(--ui-content));padding:38px 0 148px}
.app-topbar-inner{width:min(calc(100% - 28px),var(--ui-content));min-height:70px}
.page-heading{margin-bottom:20px}.page-heading h1{font-size:clamp(2.55rem,9vw,4.2rem);line-height:.98}.page-heading p{max-width:620px;font-size:1rem;line-height:1.5}
.subnav{gap:8px;margin:0 0 24px;padding-bottom:12px;overflow-x:auto;scrollbar-width:none}.subnav::-webkit-scrollbar{display:none}
.subnav-btn{min-height:44px;border:1px solid transparent;border-radius:999px;padding:9px 16px;background:rgba(255,253,248,.8);white-space:nowrap}.subnav-btn.active{box-shadow:0 6px 16px rgba(31,38,33,.12)}
.card,.section-card,.content-card,.street-sign-card,.letter-card{border-radius:var(--ui-radius);box-shadow:var(--ui-shadow)}
.section-card{padding:20px}.group-block{margin-top:28px}.group-heading{margin-bottom:12px}
.letter-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.letter-card{min-width:0;padding:18px 12px 12px}.letter-card .glyph{font-size:clamp(2.8rem,15vw,4.2rem)}.letter-actions{gap:8px}
.letter-hear,.letter-master,.content-hear,.master-btn,.secondary-btn,.primary-btn,.ghost-btn{min-height:var(--ui-tap);border-radius:var(--ui-radius-sm)}
.content-grid,.sign-grid{grid-template-columns:1fr;gap:12px}.content-card,.street-sign-card{padding:18px}.content-card .bg{font-size:clamp(2rem,10vw,3.1rem);line-height:1.05}
.content-actions,.street-sign-actions{gap:8px}.content-actions .master-btn,.street-sign-actions .master-btn{margin-left:auto}
.bottom-nav{width:min(calc(100% - 20px),640px);bottom:max(10px,env(safe-area-inset-bottom));border-radius:24px;padding:7px;box-shadow:0 16px 45px rgba(31,38,33,.18)}
.bottom-nav-btn{min-height:62px;border-radius:18px;gap:4px}.bottom-nav-btn span{font-size:.72rem}.support-footer{padding-bottom:132px}
.vocabulary-grid{gap:11px}.vocabulary-category{min-height:124px;border-radius:20px}.admin-panel .section-card{margin-bottom:10px}
@media(min-width:620px){.app-main{padding-top:46px}.letter-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.content-grid,.sign-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.vocabulary-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:420px){.app-main{width:min(calc(100% - 20px),var(--ui-content));padding-top:24px}.app-topbar-inner{width:calc(100% - 20px);min-height:62px}.app-topbar .brand{font-size:.92rem}.app-topbar-actions{gap:6px}.app-topbar .pill{font-size:.72rem;padding:7px 9px}.topbar-buy-btn{font-size:.78rem;padding:9px 11px}.page-heading h1{font-size:2.65rem}.section-card-head{align-items:flex-start}.section-card-head span{font-size:.78rem}.letter-card{padding:15px 9px 10px}.letter-hear,.letter-master{font-size:.78rem;padding:8px 6px}.content-actions,.street-sign-actions{align-items:stretch}.content-actions .master-btn,.street-sign-actions .master-btn{width:100%;margin-left:0}.bottom-nav{width:calc(100% - 12px);bottom:max(6px,env(safe-area-inset-bottom));border-radius:20px}.bottom-nav-btn{padding:7px 3px}.bottom-nav-btn span{font-size:.66rem}}
@media(max-width:340px){.app-topbar .pill{display:none}.bottom-nav-btn svg{width:20px;height:20px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}

/* Real-world reading missions */
.mission-intro{margin-bottom:14px}.mission-intro .eyebrow,.menu-challenge .eyebrow,.reading-mission .eyebrow{margin:0 0 7px;color:var(--green);font-size:.72rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}
.menu-board{display:grid;gap:12px}.menu-board-top{display:flex;align-items:end;justify-content:space-between;gap:12px;padding:4px 2px 8px}.menu-board-top span{font-family:"Fraunces",Georgia,serif;font-size:2.4rem;font-weight:700;letter-spacing:.05em}.menu-board-top small{color:var(--muted);font-weight:700;letter-spacing:.08em}
#menu-board-items{display:grid;gap:12px}.menu-section{padding:18px!important}.menu-section-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.menu-section h3{margin:0;color:var(--ink);font-size:1rem;letter-spacing:.08em}.menu-hear{min-height:40px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);padding:7px 11px;font-weight:800}
.menu-line{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 12px;align-items:center;padding:13px 0;border-top:1px solid var(--line)}.menu-word{min-width:0;color:var(--ink);font-size:1.08rem;overflow-wrap:anywhere}.menu-line b{display:grid;color:var(--ink);font-size:.82rem;text-align:right}.menu-line b small{color:var(--muted);font-size:.7rem;font-weight:600}.menu-actions{display:flex;align-items:center;gap:10px;grid-column:1/-1}.menu-audio{min-height:42px;padding:8px 12px}.menu-meaning{border:0;background:transparent;color:var(--green);padding:7px 0;font-weight:800;text-decoration:underline}.menu-translation{grid-column:1/-1;border-radius:11px;background:var(--green-2);color:var(--ink);padding:11px;text-align:center;font-family:"Fraunces",Georgia,serif;font-weight:700}.menu-translation[hidden]{display:none!important}
.menu-master{grid-column:1/-1;justify-self:start;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--muted);padding:9px 12px;font-size:.76rem;font-weight:800}.menu-line.mastered{background:linear-gradient(90deg,transparent,var(--green-2),transparent)}.menu-line.mastered .menu-master{background:var(--green);color:#fff;border-color:var(--green)}
.menu-challenge{margin-top:14px}.menu-challenge h2{font-family:"Fraunces",Georgia,serif;margin:0 0 14px;font-size:1.45rem}.menu-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.menu-option{min-height:52px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);padding:9px;font-weight:800}.menu-option.correct{background:var(--green-2);border-color:var(--green);color:var(--green)}.menu-option.wrong{background:#fbe8e3;border-color:#bd6049;color:#8f3929}.menu-feedback{min-height:24px;margin:13px 0;color:var(--muted)}.menu-feedback.success{color:var(--green)}.menu-feedback.try-again{color:#8f3929}
.mission-grid{display:grid;gap:12px}.reading-mission{padding:20px!important}.mission-title{display:flex;gap:12px;align-items:center}.mission-title>span{display:grid;place-items:center;width:48px;height:48px;border-radius:15px;background:var(--green-2);font-size:1.45rem}.mission-title h3{margin:0;font-family:"Fraunces",Georgia,serif;font-size:1.35rem}.reading-mission>p{margin:12px 0;color:var(--muted)}
.mission-words{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:12px}.mission-words>div{min-width:0;border-radius:13px;background:var(--surface-2);padding:6px 9px 10px}.mission-word-hear{display:flex;align-items:center;justify-content:space-between;gap:7px;width:100%;min-height:42px;border:0;background:transparent;color:var(--ink);padding:4px 0;text-align:left}.mission-word-hear strong{display:block;font-size:1.05rem;overflow-wrap:anywhere}.mission-word-hear i{font-style:normal;font-size:.8rem}.mission-words span{display:block;margin-top:1px;color:var(--green);font-size:.82rem;font-weight:700}.mission-words span[hidden]{display:none!important}.mission-master{width:100%;margin-top:7px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--muted);padding:7px 5px;font-size:.7rem;font-weight:800}.mission-words>div.mastered{background:var(--green-2)}.mission-words>div.mastered .mission-master{background:var(--green);border-color:var(--green);color:#fff}
.mission-reveal{width:100%}.real-life-reading-block+.real-life-reading-block{margin-top:32px}
#vocabulary-word.color-revealed{color:var(--word-color)!important;background:var(--word-background)!important;border-radius:18px;padding:12px 16px!important;transition:color .2s ease,background .2s ease}
.extra-reading-heading{margin-top:12px}
.share-card{margin-bottom:14px}.share-card h2{margin:2px 0 0;font-family:"Fraunces",Georgia,serif}.share-card .primary-btn{width:100%;margin-top:8px}.share-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:12px}.share-option{display:grid;place-items:center;min-height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--green);padding:8px;text-align:center;font:inherit;font-size:.82rem;font-weight:800;text-decoration:none}.share-option:last-child{grid-column:1/-1}.share-option:hover,.share-option:focus-visible{background:var(--green-2);border-color:var(--green)}
@media(min-width:720px){.mission-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reading-mission:last-child{grid-column:1/-1}.menu-board{max-width:760px;margin-left:auto;margin-right:auto}}
@media(max-width:420px){.menu-board-top{padding:3px 2px 8px}.menu-board-top span{font-size:2rem}.menu-board-top small{font-size:.62rem}.menu-section{padding:15px!important}.mission-words{grid-template-columns:1fr 1fr}.mission-words strong{font-size:.92rem}}

/* Responsive navigation, clearer actions and accessible interaction states. */
:where(button,a,[role="button"]):focus-visible{outline:3px solid rgba(47,118,85,.38);outline-offset:3px}
:where(button,a,[role="button"]){-webkit-tap-highlight-color:transparent}
.letter-master,.master-btn,.menu-master,.mission-master{border-color:rgba(47,118,85,.38);background:#f7fbf8;color:var(--green);font-weight:800}
.letter-master:hover,.master-btn:hover,.menu-master:hover,.mission-master:hover{background:var(--green-2);border-color:var(--green)}
.letter-card.mastered .letter-master,.content-card.mastered .master-btn,.street-sign-card.mastered .master-btn{background:var(--green);border-color:var(--green);color:#fff}
.content-actions,.street-sign-actions{flex-wrap:wrap}
.content-actions .content-hear,.street-sign-actions .content-hear{order:1}
.content-actions .meaning-btn,.street-sign-actions .meaning-btn{order:2}
.content-actions .master-btn,.street-sign-actions .master-btn{order:3}

@media(min-width:1024px){
  :root{--ui-content:1180px}
  .app-page{padding-bottom:0}
  .app-topbar{z-index:60}
  .app-topbar-inner,.app-main,.support-footer{width:auto;max-width:var(--ui-content);margin-left:270px;margin-right:40px}
  .app-topbar-inner{min-height:74px}
  .app-main{padding:32px 0 72px}
  .page-heading{margin-bottom:18px}
  .page-heading h1{font-size:clamp(3.2rem,4.7vw,4.25rem);line-height:.98}
  .page-heading p{font-size:1.04rem}
  .bottom-nav{left:24px;right:auto;top:96px;bottom:auto;transform:none;width:220px;grid-template-columns:1fr;gap:6px;border:1px solid var(--line);border-radius:22px;padding:10px;background:rgba(255,253,248,.96);box-shadow:0 18px 44px rgba(31,38,33,.12)}
  .bottom-nav-btn{min-height:54px;display:flex;flex-direction:row;justify-content:flex-start;gap:13px;border-radius:14px;padding:10px 14px;font-size:.91rem}
  .bottom-nav-btn svg{width:23px;height:23px;flex:0 0 auto}
  .bottom-nav-btn span{font-size:.91rem}
  .bottom-nav-btn.active{box-shadow:inset 3px 0 var(--green)}
  .support-footer{padding:24px 0 40px;text-align:left}
  .content-grid,.sign-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .listen-section{max-width:900px}
  .listen-hero{padding-top:0}
  .listen-hero h1{font-size:4.1rem;line-height:.95;margin-bottom:12px}
  .listen-library-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .listen-library-grid button:last-child{grid-column:auto}
  .progress-hero{text-align:left}
}

@media(min-width:1440px){
  .app-topbar-inner,.app-main,.support-footer{margin-left:300px;margin-right:64px}
  .bottom-nav{left:40px;width:230px}
  .letter-grid{grid-template-columns:repeat(5,minmax(0,1fr))}
}

@media(max-width:1023px){
  .app-main{padding-bottom:148px}
  .support-footer{padding-bottom:132px}
  .bottom-nav{bottom:max(10px,env(safe-area-inset-bottom))}
}

@media(max-width:420px){
  .page-heading{margin-bottom:16px}
  .page-heading h1{font-size:2.45rem;line-height:1}
  .page-heading p{font-size:.94rem}
  .section-card{padding:16px}
  .letter-grid{gap:9px}
  .bottom-nav-btn{min-width:0}
}

/* One learning language across every page and sub-section. */
.app-section>.page-heading,.app-section>.subnav,.app-section>.view{width:100%}
.view.active{animation:view-in .18s ease-out}
@keyframes view-in{from{opacity:.45;transform:translateY(3px)}to{opacity:1;transform:none}}
.section-card-head{min-height:44px}
.section-card-head h2,.reading-mission h3,.menu-section h3{line-height:1.12}
.group-block,.real-life-reading-block{margin-top:24px}
.group-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;padding:0 2px}

/* Cards share the same surface, spacing and action hierarchy. */
.letter-card,.content-card,.street-sign-card,.reading-mission,.menu-section{
  border:1px solid var(--line);background:var(--surface);border-radius:22px;box-shadow:var(--ui-shadow)
}
.letter-hear,.content-hear,.menu-audio,.menu-hear{
  border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:800
}
.meaning-link,.menu-meaning{color:var(--green);font-weight:800;text-decoration:underline;text-underline-offset:3px}
.letter-master,.master-btn,.menu-master,.mission-master{min-height:44px;background:#f8fcf9;border:1px solid rgba(47,118,85,.42);color:var(--green)}
.letter-card.mastered,.content-card.mastered,.street-sign-card.mastered,.menu-line.mastered,.mission-words>div.mastered{box-shadow:inset 0 0 0 2px rgba(47,118,85,.16)}

/* Real-world sections now use the same predictable structure. */
.mission-intro,.vocabulary-intro{border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:var(--ui-shadow)}
.mission-grid{grid-template-columns:1fr!important;gap:16px}
.reading-mission:last-child{grid-column:auto!important}
.reading-mission{padding:24px!important}
.reading-mission>p{margin:12px 0 18px}
.mission-words{gap:10px;margin-bottom:16px}
.mission-words>div{border:1px solid #e2dacd;background:var(--surface-2);padding:8px 10px 10px}
.mission-reveal{min-height:48px;border-color:var(--ink);background:transparent;color:var(--ink);font-weight:800}
.menu-board{max-width:none!important;gap:16px}
.menu-section{padding:24px!important}
.menu-line{padding:16px 0}
.menu-master{justify-self:stretch;width:100%}
.street-sign-actions,.content-actions{display:grid;grid-template-columns:auto auto minmax(150px,1fr);align-items:center}
.street-sign-actions .master-btn,.content-actions .master-btn{width:100%;margin-left:0}

@media(min-width:720px){
  .mission-words{grid-template-columns:repeat(4,minmax(0,1fr))}
  #menu-board-items{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start}
}

@media(min-width:1024px){
  .app-section>.page-heading{margin-top:0}
  .app-section>.subnav{margin-bottom:22px}
  .section-card,.mission-intro,.vocabulary-intro{padding:24px}
  .content-grid,.sign-grid{gap:16px}
  .reading-mission{padding:26px!important}
  .mission-title>span{width:52px;height:52px}
  .mission-title h3{font-size:1.55rem}
  .menu-section{padding:26px!important}
}

@media(max-width:719px){
  .mission-words{grid-template-columns:repeat(2,minmax(0,1fr))}
  .street-sign-actions,.content-actions{grid-template-columns:1fr 1fr}
  .street-sign-actions .master-btn,.content-actions .master-btn{grid-column:1/-1}
}

@media(max-width:420px){
  .reading-mission,.menu-section{padding:16px!important}
  .mission-title{align-items:flex-start}
  .mission-title>span{width:44px;height:44px}
  .mission-words{grid-template-columns:1fr}
  .menu-line{padding:14px 0}
}