:root{--color-bg:#0a0a1a;--color-bg-secondary:#12122a;--color-bg-card:#ffffff0a;--color-bg-card-hover:#ffffff14;--color-glass:#ffffff0f;--color-glass-border:#ffffff1a;--color-primary:#ff6900;--color-primary-light:#ff8a3d;--color-primary-dark:#cc5400;--color-secondary:#003da5;--color-secondary-light:#1a5fc7;--color-accent-red:#ae1c28;--color-success:#10b981;--color-error:#ef4444;--color-warning:#f59e0b;--color-text:#f1f1f1;--color-text-secondary:#9ca3af;--color-text-muted:#6b7280;--color-border:#ffffff14;--font-heading:"Inter", system-ui, sans-serif;--font-body:"Outfit", system-ui, sans-serif;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 16px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow:0 0 20px #ff690026;--transition-fast:.15s ease;--transition-base:.25s ease;--transition-slow:.4s ease}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-body);background:var(--color-bg);color:var(--color-text);min-height:100vh;line-height:1.6;overflow-x:hidden}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(at 20% 20%,#ff69000f 0%,#0000 50%),radial-gradient(at 80% 80%,#003da50f 0%,#0000 50%);position:fixed;inset:0}#app{z-index:1;min-height:100vh;position:relative}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:700;line-height:1.2}a{color:var(--color-primary);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--color-primary-light)}button{cursor:pointer;font-family:var(--font-body);transition:all var(--transition-base);border:none;outline:none}img{max-width:100%;height:auto;display:block}.container{max-width:1200px;padding:0 var(--space-lg);margin:0 auto}.glass{background:var(--color-glass);border:1px solid var(--color-glass-border);-webkit-backdrop-filter:blur(12px)}.navbar{z-index:100;padding:var(--space-md) 0;-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--color-border);background:#0a0a1ad9;position:sticky;top:0}.navbar .container{justify-content:space-between;align-items:center;display:flex}.navbar-brand{align-items:center;gap:var(--space-sm);font-family:var(--font-heading);color:var(--color-text);font-size:1.4rem;font-weight:800;display:flex}.navbar-brand .logo-icon{font-size:1.6rem}.navbar-brand span{color:var(--color-primary)}.navbar-user{align-items:center;gap:var(--space-md);display:flex}.navbar-stats{align-items:center;gap:var(--space-xs);color:var(--color-text-secondary);padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);background:var(--color-bg-card);font-size:.85rem;display:flex}.navbar-stats .streak-icon{font-size:1.1rem}.btn-profile{border-radius:var(--radius-full);background:linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));color:#fff;justify-content:center;align-items:center;width:36px;height:36px;font-size:.85rem;font-weight:600;display:flex}.btn-profile:hover{box-shadow:var(--shadow-glow);transform:scale(1.05)}.btn-logout{padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);color:var(--color-text-muted);border:1px solid var(--color-border);background:0 0;font-size:.8rem}.btn-logout:hover{color:var(--color-error);border-color:var(--color-error)}.auth-page{min-height:100vh;padding:var(--space-lg);justify-content:center;align-items:center;display:flex}.auth-container{width:100%;max-width:420px}.auth-header{text-align:center;margin-bottom:var(--space-2xl)}.auth-header .logo{margin-bottom:var(--space-md);font-size:3rem}.auth-header h1{margin-bottom:var(--space-sm);font-size:2rem}.auth-header h1 span{color:var(--color-primary)}.auth-header p{color:var(--color-text-secondary);font-size:.95rem}.auth-card{padding:var(--space-xl);border-radius:var(--radius-lg);background:var(--color-bg-secondary);border:1px solid var(--color-border)}.auth-tabs{gap:var(--space-xs);margin-bottom:var(--space-xl);background:var(--color-bg-card);border-radius:var(--radius-md);padding:var(--space-xs);display:flex}.auth-tab{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);color:var(--color-text-muted);background:0 0;flex:1;font-size:.9rem;font-weight:500}.auth-tab.active{background:var(--color-primary);color:#fff}.form-group{margin-bottom:var(--space-md)}.form-group label{margin-bottom:var(--space-xs);color:var(--color-text-secondary);font-size:.85rem;font-weight:500;display:block}.form-group input{width:100%;padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);transition:border-color var(--transition-fast);font-size:.95rem}.form-group input:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px #ff69001a}.btn-primary{width:100%;padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-sm);background:linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));color:#fff;margin-top:var(--space-md);font-size:1rem;font-weight:600}.btn-primary:hover{box-shadow:var(--shadow-glow);transform:translateY(-1px)}.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.auth-divider{align-items:center;gap:var(--space-md);margin:var(--space-lg) 0;color:var(--color-text-muted);font-size:.8rem;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--color-border);flex:1;height:1px}.btn-google{width:100%;padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-sm);background:var(--color-bg);color:var(--color-text);border:1px solid var(--color-border);justify-content:center;align-items:center;gap:var(--space-sm);font-size:.95rem;font-weight:500;display:flex}.btn-google:hover{background:var(--color-bg-card-hover);border-color:var(--color-text-muted)}.auth-error{margin-top:var(--space-md);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);color:var(--color-error);background:#ef44441a;border:1px solid #ef44444d;font-size:.85rem;display:none}.auth-error.visible{display:block}.home-page{padding:var(--space-2xl) 0}.home-header{margin-bottom:var(--space-2xl)}.home-header h2{margin-bottom:var(--space-xs);font-size:1.6rem}.home-header p{color:var(--color-text-secondary)}.progress-overview{gap:var(--space-md);margin-bottom:var(--space-2xl);flex-wrap:wrap;display:flex}.progress-stat{padding:var(--space-md) var(--space-lg);border-radius:var(--radius-md);background:var(--color-bg-card);border:1px solid var(--color-border);flex:1;min-width:140px}.progress-stat .stat-value{font-family:var(--font-heading);color:var(--color-primary);font-size:1.8rem;font-weight:800}.progress-stat .stat-label{color:var(--color-text-muted);margin-top:var(--space-xs);font-size:.8rem}.lesson-grid{gap:var(--space-lg);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));display:grid}.lesson-card{padding:var(--space-lg);border-radius:var(--radius-lg);background:var(--color-bg-card);border:1px solid var(--color-border);cursor:pointer;transition:all var(--transition-base);position:relative;overflow:hidden}.lesson-card:before{content:"";background:linear-gradient(90deg, var(--color-primary), var(--color-secondary));opacity:0;height:3px;transition:opacity var(--transition-base);position:absolute;top:0;left:0;right:0}.lesson-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-lg), var(--shadow-glow);transform:translateY(-4px)}.lesson-card:hover:before{opacity:1}.lesson-card-emoji{margin-bottom:var(--space-md);font-size:2.5rem}.lesson-card-title{font-family:var(--font-heading);margin-bottom:var(--space-xs);font-size:1.1rem;font-weight:600}.lesson-card-meta{color:var(--color-text-muted);margin-bottom:var(--space-md);font-size:.8rem}.lesson-progress-bar{border-radius:var(--radius-full);background:var(--color-bg);height:4px;overflow:hidden}.lesson-progress-fill{border-radius:var(--radius-full);background:linear-gradient(90deg, var(--color-primary), var(--color-primary-light));height:100%;transition:width var(--transition-slow)}.lesson-card-percent{color:var(--color-text-muted);margin-top:var(--space-xs);text-align:right;font-size:.75rem}.lesson-page{padding:var(--space-xl) 0 var(--space-3xl)}.lesson-header{align-items:center;gap:var(--space-md);margin-bottom:var(--space-xl);display:flex}.btn-back{border-radius:var(--radius-full);background:var(--color-bg-card);border:1px solid var(--color-border);width:40px;height:40px;color:var(--color-text);justify-content:center;align-items:center;font-size:1.2rem;display:flex}.btn-back:hover{background:var(--color-bg-card-hover);border-color:var(--color-primary);color:var(--color-primary)}.lesson-header-info h1{font-size:1.4rem}.lesson-header-info p{color:var(--color-text-muted);font-size:.85rem}.lesson-tabs{gap:var(--space-xs);margin-bottom:var(--space-xl);background:var(--color-bg-card);border-radius:var(--radius-md);padding:var(--space-xs);max-width:400px;display:flex}.lesson-tab{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);color:var(--color-text-muted);justify-content:center;align-items:center;gap:var(--space-xs);background:0 0;flex:1;font-size:.9rem;font-weight:500;display:flex}.lesson-tab.active{background:var(--color-primary);color:#fff}.lesson-tab:hover:not(.active){color:var(--color-text)}.flashcard-container{align-items:center;gap:var(--space-xl);flex-direction:column;display:flex}.flashcard-wrapper{perspective:1000px;cursor:pointer;width:100%;max-width:420px;height:520px}.flashcard{width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;border-radius:var(--radius-xl);width:100%;height:100%;padding:var(--space-xl);background:var(--color-bg-secondary);border:1px solid var(--color-border);flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;overflow:hidden}.flashcard-back{transform:rotateY(180deg)}.flashcard-image{border-radius:var(--radius-lg);object-fit:cover;width:200px;height:200px;margin-bottom:var(--space-lg);background:var(--color-bg-card);justify-content:center;align-items:center;font-size:5rem;display:flex}.flashcard-dutch{font-family:var(--font-heading);color:var(--color-primary);margin-bottom:var(--space-sm);text-align:center;font-size:2rem;font-weight:800}.flashcard-hint{color:var(--color-text-muted);margin-bottom:var(--space-lg);font-size:.85rem}.flashcard-turkish{margin-bottom:var(--space-md);text-align:center;font-size:1.4rem;font-weight:600}.flashcard-mnemonic{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);color:var(--color-primary-light);text-align:center;background:#ff690014;border:1px solid #ff690033;max-width:100%;font-size:.9rem}.flashcard-mnemonic .mnemonic-icon{margin-right:var(--space-xs)}.flashcard-nav{align-items:center;gap:var(--space-lg);display:flex}.btn-nav{border-radius:var(--radius-full);background:var(--color-bg-card);border:1px solid var(--color-border);width:48px;height:48px;color:var(--color-text);justify-content:center;align-items:center;font-size:1.3rem;display:flex}.btn-nav:hover{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.btn-nav:disabled{opacity:.3;cursor:not-allowed}.flashcard-counter{color:var(--color-text-muted);text-align:center;min-width:60px;font-size:.9rem;font-weight:500}.flashcard-dots{gap:var(--space-xs);flex-wrap:wrap;justify-content:center;max-width:420px;display:flex}.flashcard-dot{border-radius:var(--radius-full);background:var(--color-bg-card);border:1px solid var(--color-border);width:8px;height:8px;transition:all var(--transition-fast)}.flashcard-dot.active{background:var(--color-primary);border-color:var(--color-primary);transform:scale(1.3)}.flashcard-dot.known{background:var(--color-success);border-color:var(--color-success)}.flashcard-actions{gap:var(--space-md);display:flex}.btn-know,.btn-dont-know{padding:var(--space-sm) var(--space-xl);border-radius:var(--radius-full);font-size:.9rem;font-weight:600}.btn-know{color:var(--color-success);background:#10b98126;border:1px solid #10b9814d}.btn-know:hover{background:var(--color-success);color:#fff}.btn-dont-know{color:var(--color-error);background:#ef444426;border:1px solid #ef44444d}.btn-dont-know:hover{background:var(--color-error);color:#fff}.story-container{max-width:700px;margin:0 auto}.story-card{padding:var(--space-xl);border-radius:var(--radius-lg);background:var(--color-bg-secondary);border:1px solid var(--color-border)}.story-title{margin-bottom:var(--space-lg);align-items:center;gap:var(--space-sm);font-size:1.2rem;display:flex}.story-text{color:var(--color-text-secondary);font-size:1rem;line-height:1.8}.story-text .word-highlight{color:var(--color-primary);cursor:pointer;transition:all var(--transition-fast);border-radius:4px;padding:2px 4px;font-weight:600}.story-text .word-highlight:hover{background:#ff690026}.story-associations{margin-top:var(--space-xl);border-top:1px solid var(--color-border);padding-top:var(--space-xl)}.story-associations h3{margin-bottom:var(--space-md);font-size:1rem}.association-list{gap:var(--space-sm);grid-template-columns:repeat(auto-fill,minmax(240px,1fr));display:grid}.association-item{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);background:var(--color-bg-card);align-items:baseline;gap:var(--space-sm);font-size:.85rem;display:flex}.association-item .dutch-word{color:var(--color-primary);font-weight:600}.association-item .association{color:var(--color-text-muted)}.quiz-container{max-width:600px;margin:0 auto}.quiz-header{margin-bottom:var(--space-xl);justify-content:space-between;align-items:center;display:flex}.quiz-score{font-family:var(--font-heading);font-size:1.2rem;font-weight:700}.quiz-progress-text{color:var(--color-text-muted);font-size:.85rem}.quiz-card{padding:var(--space-2xl);border-radius:var(--radius-lg);background:var(--color-bg-secondary);border:1px solid var(--color-border);text-align:center}.quiz-question{font-family:var(--font-heading);color:var(--color-primary);margin-bottom:var(--space-sm);font-size:1.8rem;font-weight:700}.quiz-question-label{color:var(--color-text-muted);margin-bottom:var(--space-2xl);font-size:.85rem}.quiz-options{gap:var(--space-md);grid-template-columns:1fr 1fr;display:grid}.quiz-option{padding:var(--space-md);border-radius:var(--radius-md);background:var(--color-bg-card);border:2px solid var(--color-border);color:var(--color-text);transition:all var(--transition-fast);font-size:1rem;font-weight:500}.quiz-option:hover:not(:disabled){border-color:var(--color-primary);background:#ff690014}.quiz-option.correct{border-color:var(--color-success);color:var(--color-success);background:#10b9811f}.quiz-option.wrong{border-color:var(--color-error);color:var(--color-error);background:#ef44441f}.quiz-result{text-align:center;padding:var(--space-2xl)}.quiz-result-score{font-family:var(--font-heading);color:var(--color-primary);font-size:3rem;font-weight:800}.quiz-result-label{color:var(--color-text-secondary);margin-bottom:var(--space-xl)}.btn-restart{padding:var(--space-sm) var(--space-2xl);border-radius:var(--radius-full);background:linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));color:#fff;font-weight:600}.loading-spinner{border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:24px;height:24px;animation:.8s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.loading-page{justify-content:center;align-items:center;gap:var(--space-md);flex-direction:column;min-height:100vh;display:flex}.loading-page .loading-spinner{width:40px;height:40px}.toast{bottom:var(--space-xl);padding:var(--space-sm) var(--space-xl);border-radius:var(--radius-full);z-index:1000;transition:transform var(--transition-base);box-shadow:var(--shadow-lg);font-size:.9rem;font-weight:500;position:fixed;left:50%;transform:translate(-50%)translateY(100px)}.toast.visible{transform:translate(-50%)translateY(0)}.toast.success{background:var(--color-success);color:#fff}.toast.error{background:var(--color-error);color:#fff}@media (width<=768px){.lesson-grid{gap:var(--space-md);grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}.flashcard-wrapper{height:460px}.flashcard-image{width:160px;height:160px;font-size:4rem}.flashcard-dutch{font-size:1.6rem}.quiz-options{grid-template-columns:1fr}.progress-overview{flex-direction:column}.navbar-stats{display:none}.quiz-question{font-size:1.4rem}}@media (width<=480px){.container{padding:0 var(--space-md)}.lesson-grid{grid-template-columns:1fr}.flashcard-wrapper{height:420px}.auth-card{padding:var(--space-lg)}.lesson-tabs{max-width:100%}}