/* Audio Learn - Complete Minified Theme */
:root{--bg:#f7f9fc;--card:#fff;--text:#0b1b2b;--muted:#6c757d;--primary:#0d6efd;--secondary:#6c757d;--success:#198754;--danger:#dc3545;--warning:#ffc107;--info:#0dcaf0;--accent:rgba(13,110,253,.08);--border:#e9ecef;--shadow:0 10px 24px rgba(2,6,23,.08);--radius:16px;--radius-sm:12px;--radius-lg:20px;--transition:all .3s ease;--font:'Inter',-apple-system,Roboto,'Helvetica Neue',Arial,sans-serif}
[data-theme="dark"]{--bg:#0b0f14;--card:#071021;--text:#e6eef8;--muted:#9fb0c8;--primary:#4da3ff;--secondary:#9fb0c8;--success:#3ddc84;--danger:#ff6b6b;--warning:#ffd666;--info:#6cb2ff;--accent:rgba(77,163,255,.06);--border:#1e2d3d;--shadow:0 10px 24px rgba(0,0,0,.2)}

*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;touch-action:pan-y}
a{text-decoration:none;color:inherit}
button{border:none;background:none;cursor:pointer;font-family:inherit}
img{max-width:100%}

/* Layout */
.container{max-width:1200px;margin:0 auto;padding:0 1rem}
.main-content{margin-left:280px;min-height:100vh}
@media (max-width:991px){.main-content{margin-left:0;padding-bottom:80px}}

/* Sidebar */
.sidebar{position:fixed;left:0;top:0;bottom:0;width:280px;background:var(--card);border-right:1px solid var(--border);z-index:1000;overflow-y:auto}
.sidebar-header{padding:1.5rem 1.5rem 1rem;border-bottom:1px solid var(--border)}
.sidebar-nav{padding:1rem 0}
.sidebar-nav .nav-item{display:flex;align-items:center;gap:.75rem;padding:.75rem 1.5rem;color:var(--text);transition:var(--transition);border-left:3px solid transparent}
.sidebar-nav .nav-item:hover,.sidebar-nav .nav-item.active{background:var(--accent);border-left-color:var(--primary)}
.sidebar-divider{margin:1rem 1.5rem;border-top:1px solid var(--border)}

/* Top Navigation */
.navbar{background:var(--primary);border-radius:0 0 18px 18px;padding:.75rem 1rem;color:#fff}
.navbar-brand{color:#fff!important;font-weight:700;font-size:1.05rem}
.btn-outline-light{border:none;color:#fff}

/* Mobile Offcanvas */
.offcanvas{background:var(--card)!important;color:var(--text)!important}
.offcanvas-header{border-bottom:1px solid var(--border)}
.mobile-nav .nav-item{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;color:var(--text);border-left:3px solid transparent}
.mobile-nav .nav-item.active{background:var(--accent);border-left-color:var(--primary)}
.nav-divider{margin:1rem 0;border-top:1px solid var(--border)}

/* Bottom Navigation */
.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--card);display:flex;justify-content:space-around;padding:.5rem;border-top:1px solid var(--border);z-index:1000}
.nav-btn{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:.5rem;color:var(--muted);font-size:.75rem;transition:var(--transition)}
.nav-btn.active{color:var(--primary)}

/* Cards */
.card{background:var(--card);border:none;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.card-body{padding:1.5rem}
.card-title{font-weight:700;margin-bottom:.5rem}
.card-text{color:var(--muted)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;border-radius:var(--radius-sm);font-weight:500;transition:var(--transition);border:1px solid transparent}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary);filter:brightness(1.1);transform:translateY(-1px)}
.btn-outline-primary{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-outline-primary:hover{background:var(--primary);color:#fff}
.btn-success{background:var(--success);color:#fff;border-color:var(--success)}
.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}
.btn-warning{background:var(--warning);color:#000;border-color:var(--warning)}
.btn-secondary{background:var(--secondary);color:#fff;border-color:var(--secondary)}
.btn-light{background:var(--accent);color:var(--text);border-color:var(--border)}
.btn-sm{padding:.25rem .75rem;font-size:.875rem}
.btn-lg{padding:.75rem 1.5rem;font-size:1.1rem}

/* Forms */
.form-control{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);padding:.5rem .75rem;transition:var(--transition)}
.form-control:focus{background:var(--card);border-color:var(--primary);color:var(--text);box-shadow:0 0 0 3px rgba(13,110,253,.1)}
.form-label{color:var(--text);font-weight:500;margin-bottom:.5rem}
.form-select{background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm)}

/* Progress */
.progress{height:10px;border-radius:10px;overflow:hidden;background:rgba(0,0,0,.06)}
.progress-bar{background:linear-gradient(90deg,var(--primary),#4da3ff,var(--primary));background-size:200% 100%;animation:progress-shine 3s infinite;transition:width .5s cubic-bezier(.4,0,.2,1)}
@keyframes progress-shine{0%{background-position:-200% 0}100%{background-position:200% 0}}

/* Alerts & Toasts */
.alert{padding:.75rem 1rem;border-radius:var(--radius-sm);border:1px solid transparent;margin-bottom:1rem}
.alert-success{background:rgba(25,135,84,.1);border-color:var(--success);color:var(--success)}
.alert-danger{background:rgba(220,53,69,.1);border-color:var(--danger);color:var(--danger)}
.alert-warning{background:rgba(255,193,7,.1);border-color:var(--warning);color:var(--warning)}
.alert-info{background:rgba(13,202,240,.1);border-color:var(--info);color:var(--info)}
.toast{background:var(--card)!important;color:var(--text)!important;border-radius:var(--radius-sm)!important;box-shadow:var(--shadow)!important}

/* Learning Card Specific */
.app-card{margin-bottom:96px;position:relative}
.sentence-wrap{min-height:160px;display:flex;align-items:center;justify-content:center;padding:1.5rem 1rem;cursor:pointer}
.native{font-size:1.35rem;font-weight:700;text-align:center;line-height:1.4}
.learning{font-size:1.05rem;margin-top:.5rem;text-align:center;opacity:.92;color:var(--muted)}
.tap-hint{font-size:.8rem;color:var(--muted);text-align:center;margin-top:.5rem}
.controls .btn{min-width:84px}

/* Difficulty Badges */
.difficulty-badge{position:absolute;top:12px;right:12px;background:rgba(255,255,255,.9);padding:6px 10px;border-radius:999px;font-size:.8rem;font-weight:700;box-shadow:0 4px 12px rgba(0,0,0,.06)}
[data-theme="dark"] .difficulty-badge{background:rgba(7,16,33,.6);color:var(--text)}
.hard{border-left:6px solid var(--danger)}
.medium{border-left:6px solid var(--warning)}
.easy{border-left:6px solid var(--success)}
.mastered{border-left:6px solid #6f42c1}

/* Completion Screen */
.completion-screen{padding:1.5rem;text-align:center}
.completion-emoji{font-size:3rem;margin-bottom:.35rem}
.feedback-btn{width:100%;border-radius:var(--radius-sm);padding:.85rem;margin-top:.6rem;text-align:left;background:var(--accent);transition:var(--transition);position:relative;overflow:hidden}
.feedback-btn:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,.12)}

/* Animations */
.sentence-transition-enter-active,.sentence-transition-leave-active{transition:all .4s cubic-bezier(.4,0,.2,1)}
.sentence-transition-enter-from{opacity:0;transform:translateX(50px) scale(.95)}
.sentence-transition-leave-to{opacity:0;transform:translateX(-50px) scale(.95)}
.feedback-btn.pulse{animation:pulse-glow 2s infinite}
.feedback-btn.bounce{animation:gentle-bounce 3s infinite}
.feedback-btn.shimmer{position:relative;overflow:hidden}
.feedback-btn.shimmer::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);animation:shimmer 3s infinite}
@keyframes pulse-glow{0%,100%{box-shadow:0 4px 12px rgba(13,110,253,.2);border:1px solid rgba(13,110,253,.3)}50%{box-shadow:0 4px 20px rgba(13,110,253,.4);border:1px solid rgba(13,110,253,.6)}}
@keyframes gentle-bounce{0%,20%,50%,80%,100%{transform:translateY(0)}40%{transform:translateY(-5px)}60%{transform:translateY(-3px)}}
@keyframes shimmer{0%{left:-100%}100%{left:100%}}
.card-entrance{animation:cardSlideUp .6s cubic-bezier(.4,0,.2,1)}
@keyframes cardSlideUp{from{opacity:0;transform:translateY(30px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}
.rating-selected{animation:ratingPop .3s ease;background:var(--primary)!important;color:#fff!important}
@keyframes ratingPop{0%{transform:scale(1)}50%{transform:scale(1.1)}100%{transform:scale(1)}}

/* Tables */
.table{background:var(--card);color:var(--text);border-radius:var(--radius);overflow:hidden}
.table th{background:var(--accent);color:var(--text);font-weight:600;border-color:var(--border)}
.table td{border-color:var(--border);padding:.75rem}

/* Lists */
.list-group-item{background:var(--card);color:var(--text);border-color:var(--border);padding:.75rem 1rem}
.list-group-item.active{background:var(--primary);border-color:var(--primary)}
.list-group-item:hover{background:var(--accent)}

/* Badges */
.badge{font-size:.75em;padding:.35em .65em;border-radius:999px;font-weight:500}
.badge-primary{background:var(--primary);color:#fff}
.badge-success{background:var(--success);color:#fff}
.badge-danger{background:var(--danger);color:#fff}
.badge-warning{background:var(--warning);color:#000}

/* Utilities */
.text-primary{color:var(--primary)!important}
.text-success{color:var(--success)!important}
.text-danger{color:var(--danger)!important}
.text-warning{color:var(--warning)!important}
.text-muted{color:var(--muted)!important}
.bg-primary{background:var(--primary)!important}
.bg-success{background:var(--success)!important}
.bg-danger{background:var(--danger)!important}
.bg-warning{background:var(--warning)!important}
.border{border:1px solid var(--border)!important}
.shadow{box-shadow:var(--shadow)!important}
.rounded{border-radius:var(--radius)!important}
.rounded-sm{border-radius:var(--radius-sm)!important}
.rounded-lg{border-radius:var(--radius-lg)!important}

/* Spacing */
.m-0{margin:0!important}.m-1{margin:.25rem!important}.m-2{margin:.5rem!important}.m-3{margin:1rem!important}.m-4{margin:1.5rem!important}.m-5{margin:3rem!important}
.mt-0{margin-top:0!important}.mt-1{margin-top:.25rem!important}.mt-2{margin-top:.5rem!important}.mt-3{margin-top:1rem!important}.mt-4{margin-top:1.5rem!important}.mt-5{margin-top:3rem!important}
.mb-0{margin-bottom:0!important}.mb-1{margin-bottom:.25rem!important}.mb-2{margin-bottom:.5rem!important}.mb-3{margin-bottom:1rem!important}.mb-4{margin-bottom:1.5rem!important}.mb-5{margin-bottom:3rem!important}
.p-0{padding:0!important}.p-1{padding:.25rem!important}.p-2{padding:.5rem!important}.p-3{padding:1rem!important}.p-4{padding:1.5rem!important}.p-5{padding:3rem!important}
.pt-0{padding-top:0!important}.pt-1{padding-top:.25rem!important}.pt-2{padding-top:.5rem!important}.pt-3{padding-top:1rem!important}.pt-4{padding-top:1.5rem!important}.pt-5{padding-top:3rem!important}
.pb-0{padding-bottom:0!important}.pb-1{padding-bottom:.25rem!important}.pb-2{padding-bottom:.5rem!important}.pb-3{padding-bottom:1rem!important}.pb-4{padding-bottom:1.5rem!important}.pb-5{padding-bottom:3rem!important}

/* Display */
.d-none{display:none!important}.d-block{display:block!important}.d-inline{display:inline!important}.d-inline-block{display:inline-block!important}.d-flex{display:flex!important}
@media (min-width:768px){.d-md-none{display:none!important}.d-md-block{display:block!important}.d-md-flex{display:flex!important}}
@media (min-width:992px){.d-lg-none{display:none!important}.d-lg-block{display:block!important}.d-lg-flex{display:flex!important}}

/* Flex */
.flex-row{flex-direction:row!important}.flex-column{flex-direction:column!important}.justify-content-start{justify-content:flex-start!important}.justify-content-center{justify-content:center!important}.justify-content-end{justify-content:flex-end!important}.justify-content-between{justify-content:space-between!important}.align-items-start{align-items:flex-start!important}.align-items-center{align-items:center!important}.align-items-end{align-items:flex-end!important}.gap-1{gap:.25rem!important}.gap-2{gap:.5rem!important}.gap-3{gap:1rem!important}.gap-4{gap:1.5rem!important}.gap-5{gap:3rem!important}

/* Text */
.text-center{text-align:center!important}.text-left{text-align:left!important}.text-right{text-align:right!important}.fw-bold{font-weight:700!important}.fw-semibold{font-weight:600!important}.fw-normal{font-weight:400!important}.fs-1{font-size:2.5rem!important}.fs-2{font-size:2rem!important}.fs-3{font-size:1.75rem!important}.fs-4{font-size:1.5rem!important}.fs-5{font-size:1.25rem!important}.fs-6{font-size:1rem!important}

/* Responsive */
@media (max-width:767px){.container{padding:0 .5rem}.card-body{padding:1rem}.btn{padding:.375rem .75rem}.native{font-size:1.1rem}.learning{font-size:.95rem}}
@media (min-width:768px){.container{max-width:720px}}
@media (min-width:992px){.container{max-width:960px}}
@media (min-width:1200px){.container{max-width:1140px}}


        /* Enhanced Rating Button Animations */
        .rating-buttons{display:flex;justify-content:center;gap:.5rem;flex-wrap:wrap;margin-top:1rem}
        .rating-btn{min-width:90px;padding:.6rem .8rem;border-radius:var(--radius-lg);font-weight:600;font-size:.85rem;transition:all .4s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden;border:2px solid transparent;display:flex;align-items:center;justify-content:center;gap:.4rem;flex-direction:column}
        .rating-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 8px 20px rgba(0,0,0,.15)}
        .rating-btn:active{transform:translateY(-1px) scale(1.02)}
        .rating-btn.hard{background:linear-gradient(135deg,var(--danger),#ff8a8a);color:#fff;border-color:var(--danger)}
        .rating-btn.medium{background:linear-gradient(135deg,var(--warning),#ffd666);color:#000;border-color:var(--warning)}
        .rating-btn.easy{background:linear-gradient(135deg,var(--success),#6ce5a6);color:#fff;border-color:var(--success)}
        .rating-btn.mastered{background:linear-gradient(135deg,#6f42c1,#9d7ce6);color:#fff;border-color:#6f42c1}
        .rating-btn.outline{background:transparent!important}
        .rating-btn.outline.hard{color:var(--danger);border-color:var(--danger)}
        .rating-btn.outline.medium{color:var(--warning);border-color:var(--warning)}
        .rating-btn.outline.easy{color:var(--success);border-color:var(--success)}
        .rating-btn.outline.mastered{color:#6f42c1;border-color:#6f42c1}
        .rating-btn.selected{animation:ratingSelect .6s cubic-bezier(.4,0,.2,1);box-shadow:0 0 0 4px rgba(13,110,253,.2)!important;z-index:10}
        @keyframes ratingSelect{0%{transform:scale(1)}25%{transform:scale(1.15)}50%{transform:scale(1.1)}75%{transform:scale(1.12)}100%{transform:scale(1.1)}}
        .rating-btn.animate-pulse{animation:ratingPulse 2s infinite}
        @keyframes ratingPulse{0%,100%{box-shadow:0 4px 12px rgba(0,0,0,.1);transform:translateY(0)}50%{box-shadow:0 6px 18px rgba(0,0,0,.2);transform:translateY(-2px)}}
        .rating-btn.animate-bounce{animation:ratingBounce 3s infinite}
        @keyframes ratingBounce{0%,20%,50%,80%,100%{transform:translateY(0)}40%{transform:translateY(-6px)}60%{transform:translateY(-3px)}}
        .rating-btn.animate-glow{animation:ratingGlow 4s infinite;position:relative}
        @keyframes ratingGlow{0%,100%{box-shadow:0 0 5px currentColor}50%{box-shadow:0 0 15px currentColor,0 0 25px currentColor}}
        .rating-btn.animate-float{animation:ratingFloat 6s ease-in-out infinite}
        @keyframes ratingFloat{0%,100%{transform:translateY(0px)}50%{transform:translateY(-8px)}}
        .rating-btn::before{content:'';position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:rgba(255,255,255,.6);transform:translate(-50%,-50%);transition:width .3s,height .3s}
        .rating-btn:active::before{width:100px;height:100px}
        .rating-btn i{transition:all .3s ease;font-size:1.1em}
        .rating-btn:hover i{transform:scale(1.2)}
        .rating-btn.selected i{animation:iconPop .5s ease}
        @keyframes iconPop{0%{transform:scale(1)}50%{transform:scale(1.3)}100%{transform:scale(1.2)}}
        .rating-btn:nth-child(1){animation-delay:0s}
        .rating-btn:nth-child(2){animation-delay:.2s}
        .rating-btn:nth-child(3){animation-delay:.4s}
        .rating-btn:nth-child(4){animation-delay:.6s}
        .rating-progress{position:absolute;bottom:0;left:0;width:100%;height:3px;background:rgba(255,255,255,.3);overflow:hidden}
        .rating-progress::after{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:#fff;animation:progressSlide 2s infinite}
        @keyframes progressSlide{0%{left:-100%}50%{left:0}100%{left:100%}}
        .rating-success{animation:successCelebrate .8s ease;background:var(--success)!important;color:#fff!important}
        @keyframes successCelebrate{0%{transform:scale(1)}25%{transform:scale(1.3) rotate(5deg)}50%{transform:scale(1.2) rotate(-5deg)}75%{transform:scale(1.25) rotate(2deg)}100%{transform:scale(1.1)}}
        .rating-tooltip{position:absolute;bottom:100%;left:50%;transform:translateX(-50%);background:var(--text);color:var(--bg);padding:.3rem .6rem;border-radius:var(--radius-sm);font-size:.75rem;white-space:nowrap;opacity:0;transition:all .3s ease;margin-bottom:5px;pointer-events:none}
        .rating-tooltip::after{content:'';position:absolute;top:100%;left:50%;transform:translateX(-50%);border:5px solid transparent;border-top-color:var(--text)}
        .rating-btn:hover .rating-tooltip{opacity:1;transform:translateX(-50%) translateY(-5px)}
        
        /* Confetti Animation */
        @keyframes confettiFall{0%{transform:translateY(0) rotate(0deg);opacity:1}100%{transform:translateY(400px) rotate(360deg);opacity:0}}
        
        /* Ensure card has relative positioning for confetti */
        .app-card{position:relative;overflow:visible!important}
        
        /* Enhanced sentence transitions */
        .sentence-transition-enter-active,.sentence-transition-leave-active{transition:all .4s cubic-bezier(.4,0,.2,1)}
        .sentence-transition-enter-from{opacity:0;transform:translateX(50px) scale(.95)}
        .sentence-transition-leave-to{opacity:0;transform:translateX(-50px) scale(.95)}
        .sentence-transition-enter-to,.sentence-transition-leave-from{opacity:1;transform:translateX(0) scale(1)}