:root{--bg-primary: #0A0A0F;--bg-secondary: #0F0F17;--bg-card: #13131A;--bg-card-hover: #17171F;--bg-input: #0F0F17;--border: #1E1E2A;--border-light: #2A2A3A;--accent: #60A5FA;--accent-hover: #3B82F6;--accent-light: rgba(96, 165, 250, .1);--accent-glow: rgba(96, 165, 250, .2);--success: #34D399;--success-bg: rgba(52, 211, 153, .08);--success-border:rgba(52, 211, 153, .25);--error: #F87171;--error-bg: rgba(248, 113, 113, .08);--error-border: rgba(248, 113, 113, .25);--warning: #FBBF24;--warning-bg: rgba(251, 191, 36, .08);--warning-border:rgba(251, 191, 36, .25);--text-primary: #F1F5F9;--text-secondary:#94A3B8;--text-muted: #4B5563;--masc: rgba(96, 165, 250, .15);--masc-text: #93C5FD;--fem: rgba(248, 113, 113, .15);--fem-text: #FCA5A5;--neut: rgba(52, 211, 153, .15);--neut-text: #6EE7B7;--plur: rgba(251, 191, 36, .15);--plur-text: #FCD34D;--radius: 12px;--radius-sm: 8px;--radius-lg: 18px;--shadow: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);--shadow-lg: 0 4px 24px rgba(0,0,0,.5);--transition: all .2s ease}[data-theme=light]{--bg-primary: #F8FAFC;--bg-secondary: #F1F5F9;--bg-card: #FFFFFF;--bg-card-hover: #F8FAFC;--bg-input: #F1F5F9;--border: #E2E8F0;--border-light: #CBD5E1;--accent: #2563EB;--accent-hover: #1D4ED8;--accent-light: rgba(37, 99, 235, .06);--accent-glow: rgba(37, 99, 235, .15);--success: #059669;--success-bg: rgba(5, 150, 105, .06);--success-border:rgba(5, 150, 105, .25);--error: #DC2626;--error-bg: rgba(220, 38, 38, .06);--error-border: rgba(220, 38, 38, .25);--warning: #D97706;--warning-bg: rgba(217, 119, 6, .06);--warning-border:rgba(217, 119, 6, .25);--text-primary: #0F172A;--text-secondary:#475569;--text-muted: #94A3B8;--masc: rgba(37, 99, 235, .08);--masc-text: #2563EB;--fem: rgba(220, 38, 38, .08);--fem-text: #DC2626;--neut: rgba(5, 150, 105, .08);--neut-text: #059669;--plur: rgba(217, 119, 6, .08);--plur-text: #B45309;--shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);--shadow-lg: 0 4px 12px rgba(0,0,0,.08)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,Roboto,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;transition:background-color .3s ease,color .3s ease}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;font-family:inherit}input,textarea,select{font-family:inherit}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--accent)}.app-layout{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;padding:28px 24px;max-width:960px;margin:0 auto;width:100%}.navbar{background:var(--bg-card);border-bottom:1px solid var(--border);padding:0 20px;height:60px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);transition:background-color .3s ease,border-color .3s ease}.navbar-brand{display:flex;align-items:center;gap:8px;font-size:1.05rem;font-weight:700;color:var(--text-primary);letter-spacing:-.01em;flex-shrink:0}.navbar-brand .flag{font-size:1.2rem}.navbar-nav{display:flex;align-items:center;gap:2px;flex:1;justify-content:center;padding:0 16px;overflow-x:auto}.nav-link{padding:6px 11px;border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.855rem;font-weight:500;transition:var(--transition);white-space:nowrap}.nav-link:hover{background:var(--accent-light);color:var(--text-primary)}.nav-link.active{background:var(--accent-light);color:var(--accent);font-weight:600}.navbar-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.streak-badge{display:flex;align-items:center;gap:5px;background:var(--warning-bg);border:1px solid var(--warning-border);border-radius:20px;padding:4px 10px;font-size:.8rem;font-weight:600;color:var(--warning);white-space:nowrap}.theme-toggle{width:32px;height:32px;border-radius:var(--radius-sm);background:var(--bg-input);border:1px solid var(--border);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;font-size:.95rem;transition:var(--transition)}.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}.btn-logout{padding:6px 13px;border-radius:var(--radius-sm);background:transparent;border:1px solid var(--border);color:var(--text-secondary);font-size:.82rem;font-weight:500;transition:var(--transition)}.btn-logout:hover{border-color:var(--error);color:var(--error)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 20px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:600;transition:var(--transition);border:1px solid transparent;cursor:pointer;letter-spacing:.01em}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover);transform:translateY(-1px)}.btn-secondary{background:transparent;color:var(--text-primary);border-color:var(--border-light)}.btn-secondary:hover:not(:disabled){background:var(--bg-card-hover);border-color:var(--text-muted)}.btn-ghost{background:transparent;color:var(--text-secondary);border-color:transparent}.btn-ghost:hover:not(:disabled){background:var(--bg-card-hover);color:var(--text-primary)}.btn-success{background:var(--success);color:#fff;border-color:var(--success)}.btn-success:hover:not(:disabled){opacity:.88}.btn-danger{background:var(--error);color:#fff;border-color:var(--error)}.btn-danger:hover:not(:disabled){opacity:.88}.btn-sm{padding:6px 13px;font-size:.82rem}.btn-lg{padding:12px 28px;font-size:.95rem}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none!important}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:background-color .3s ease,border-color .3s ease}.card-title{font-size:1rem;font-weight:700;color:var(--text-primary);margin-bottom:6px;letter-spacing:-.01em}.form-group{margin-bottom:14px}.form-label{display:block;font-size:.76rem;font-weight:600;color:var(--text-muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.06em}.form-input{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);padding:10px 14px;font-size:.95rem;transition:border-color .2s,box-shadow .2s;outline:none}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.form-input::placeholder{color:var(--text-muted)}.status-correct{background:var(--success-bg);border:1px solid var(--success-border);border-radius:var(--radius-sm);padding:14px;color:var(--success)}.status-incorrect{background:var(--error-bg);border:1px solid var(--error-border);border-radius:var(--radius-sm);padding:14px;color:var(--error)}.status-info{background:var(--accent-light);border:1px solid rgba(96,165,250,.2);border-radius:var(--radius-sm);padding:14px;color:var(--accent)}.explanation-box{background:var(--bg-input);border-left:3px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:14px;margin-top:10px;color:var(--text-secondary);font-size:.92rem;line-height:1.7}.error-msg{background:var(--error-bg);border:1px solid var(--error-border);border-radius:var(--radius-sm);padding:10px 14px;color:var(--error);font-size:.88rem;margin-bottom:14px}.progress-bar{background:var(--border);border-radius:4px;height:5px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:4px;transition:width .4s ease}.score-display{display:flex;align-items:center;gap:6px;font-size:.9rem;color:var(--text-secondary)}.score-number{font-weight:700;color:var(--accent);font-size:1.05rem}.spinner-container{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:48px;color:var(--text-secondary)}.spinner{width:34px;height:34px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}.spinner-sm{width:17px;height:17px;border-width:2px}@keyframes spin{to{transform:rotate(360deg)}}.page-header{margin-bottom:24px}.page-title{font-size:1.6rem;font-weight:800;color:var(--text-primary);margin-bottom:4px;letter-spacing:-.03em}.page-subtitle{color:var(--text-secondary);font-size:.92rem}.chip{display:inline-flex;align-items:center;padding:5px 12px;border-radius:20px;font-size:.82rem;font-weight:500;background:var(--bg-input);border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;transition:var(--transition);-webkit-user-select:none;user-select:none}.chip:hover{border-color:var(--accent);color:var(--accent)}.chip.selected{background:var(--accent-light);border-color:var(--accent);color:var(--accent)}.chip.used{opacity:.35;cursor:default}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px;cursor:pointer}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}@media (max-width: 600px){.grid-2,.grid-3{grid-template-columns:1fr}}.decl-table-wrap{overflow-x:auto;margin-bottom:24px}.decl-table{width:100%;border-collapse:collapse;font-size:.88rem}.decl-table th,.decl-table td{padding:9px 14px;text-align:center;border:1px solid var(--border)}.decl-table th{font-weight:700;font-size:.76rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);background:var(--bg-input)}.decl-table th:first-child,.decl-table td:first-child{text-align:left}.decl-table td:first-child{font-weight:600;color:var(--text-secondary)}.cell-m{background:var(--masc);color:var(--masc-text);font-weight:700}.cell-f{background:var(--fem);color:var(--fem-text);font-weight:700}.cell-n{background:var(--neut);color:var(--neut-text);font-weight:700}.cell-pl{background:var(--plur);color:var(--plur-text);font-weight:700}.vocab-word-row{display:flex;align-items:center;gap:10px;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);transition:var(--transition)}.vocab-word-row:hover{border-color:var(--border-light)}.vocab-de{font-weight:700;color:var(--text-primary);min-width:110px}.vocab-sk{color:var(--text-secondary);flex:1}.vocab-actions{display:flex;gap:6px;margin-left:auto}.practice-correct{background:var(--success-bg);border:1px solid var(--success);border-radius:var(--radius-sm);padding:10px 14px;color:var(--success);font-weight:600;font-size:.9rem}.practice-incorrect{background:var(--error-bg);border:1px solid var(--error);border-radius:var(--radius-sm);padding:10px 14px;color:var(--error);font-weight:600;font-size:.9rem}.milestone-banner{background:linear-gradient(135deg,#fbbf241a,#60a5fa0f);border:1px solid var(--warning-border);border-radius:var(--radius);padding:16px 20px;margin-bottom:20px;display:flex;align-items:center;gap:12px}.milestone-banner .icon{font-size:1.8rem}.milestone-banner .msg{font-weight:700;color:var(--text-primary)}.milestone-banner .sub{font-size:.84rem;color:var(--text-secondary);margin-top:2px}.reminder-banner{background:var(--accent-light);border:1px solid rgba(96,165,250,.18);border-radius:var(--radius-sm);padding:10px 14px;margin-bottom:20px;font-size:.87rem;color:var(--accent);display:flex;align-items:center;gap:8px}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .25s ease}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}.pop{animation:pop .2s ease}@media (max-width: 768px){.main-content{padding:16px}.navbar{padding:0 14px}.navbar-nav{display:none}.page-title{font-size:1.35rem}}@media (max-width: 480px){.btn{padding:9px 16px;font-size:.88rem}.card{padding:16px}}