:root{--orange-50: #fff9f0;--orange-100: #fff5eb;--orange-200: #ffe8d0;--orange-300: #ffd4a8;--orange-400: #ffb06b;--orange-500: #ff8c42;--orange-600: #e67530;--orange-700: #c45e20;--brown-800: #5c4033;--brown-700: #6d4c3d;--brown-600: #7d5a4a;--brown-500: #8b6b5a;--brown-400: #a68b7d;--brown-300: #c4a99c;--green-500: #66bb6a;--green-600: #4caf50;--red-400: #ef5350;--red-500: #e53935;--blue-400: #42a5f5;--yellow-400: #ffca28;--bg-primary: #fffaf5;--bg-card: #ffffff;--bg-input: #fff5eb;--bg-overlay: rgba(92, 64, 51, .4);--text-primary: #3d2b1f;--text-secondary: #7d5a4a;--text-muted: #a68b7d;--text-inverse: #ffffff;--border-light: #ffe8d0;--border-medium: #ffd4a8;--shadow-sm: 0 1px 3px rgba(255, 140, 66, .1);--shadow-md: 0 4px 12px rgba(255, 140, 66, .15);--shadow-lg: 0 8px 24px rgba(255, 140, 66, .2);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--font-thai: "Sarabun", "Noto Sans Thai", sans-serif;--font-cn: "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;--nav-height: 64px;--safe-bottom: env(safe-area-inset-bottom, 0px);--header-height: 56px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}body{font-family:var(--font-cn);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100dvh;overflow-x:hidden;padding-bottom:calc(var(--nav-height) + var(--safe-bottom));position:relative}body:before{content:"";position:fixed;inset:0;background-image:radial-gradient(circle,var(--orange-300) 1px,transparent 1px),radial-gradient(circle,var(--orange-200) .5px,transparent .5px);background-size:40px 40px,20px 20px;background-position:0 0,10px 10px;opacity:.15;pointer-events:none;z-index:0}#app{position:relative;z-index:1;max-width:480px;margin:0 auto;min-height:100dvh}h1,h2,h3,h4{font-weight:600;line-height:1.3}h1{font-size:1.5rem}h2{font-size:1.25rem}h3{font-size:1.1rem}a{color:var(--orange-500);text-decoration:none}.thai-text{font-family:var(--font-thai);font-size:1.3em;font-weight:400;line-height:1.8}.thai-text-lg{font-family:var(--font-thai);font-size:2rem;font-weight:500;line-height:1.6}.page-header{position:sticky;top:0;z-index:100;background:var(--orange-400);color:var(--text-inverse);padding:var(--spacing-md) var(--spacing-lg);display:flex;align-items:center;gap:var(--spacing-md);min-height:var(--header-height);box-shadow:var(--shadow-sm)}.page-header h1{font-size:1.15rem;font-weight:600;flex:1}.page-header .back-btn{background:none;border:none;color:var(--text-inverse);font-size:1.4rem;cursor:pointer;padding:var(--spacing-xs);display:flex;align-items:center}.page-content{padding:var(--spacing-lg)}.card{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);transition:box-shadow var(--transition-fast)}.card+.card{margin-top:var(--spacing-md)}.card:active{box-shadow:var(--shadow-md)}.card-title{font-size:.85rem;color:var(--text-muted);margin-bottom:var(--spacing-xs);text-transform:uppercase;letter-spacing:.5px}.card-value{font-size:1.8rem;font-weight:700;color:var(--orange-500)}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-md)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm)}.section{margin-bottom:var(--spacing-xl)}.section-title{font-size:1rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-md);display:flex;align-items:center;gap:var(--spacing-sm)}.section-title .emoji{font-size:1.2em}.empty-state{text-align:center;padding:var(--spacing-xl) var(--spacing-lg);color:var(--text-muted)}.empty-state .emoji{font-size:3rem;display:block;margin-bottom:var(--spacing-md)}.empty-state p{font-size:.95rem}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--orange-300);border-radius:2px}::selection{background:var(--orange-300);color:var(--brown-800)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.animate-fade-in{animation:fadeIn .3s ease forwards}.animate-slide-up{animation:slideUp .4s ease forwards}.animate-pulse{animation:pulse .3s ease}.animate-shake{animation:shake .3s ease}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:12px 24px;border:none;border-radius:var(--radius-full);font-family:var(--font-cn);font-size:.95rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);user-select:none;-webkit-user-select:none;touch-action:manipulation;min-height:44px}.btn:active{transform:scale(.96)}.btn-primary{background:var(--orange-400);color:var(--text-inverse);box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--orange-500);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--orange-100);color:var(--orange-600);border:1px solid var(--orange-300)}.btn-secondary:hover{background:var(--orange-200)}.btn-outline{background:transparent;color:var(--orange-500);border:2px solid var(--orange-400)}.btn-outline:hover{background:var(--orange-50)}.btn-danger{background:var(--red-400);color:var(--text-inverse)}.btn-danger:hover{background:var(--red-500)}.btn-success{background:var(--green-500);color:var(--text-inverse)}.btn-sm{padding:8px 16px;font-size:.85rem;min-height:36px}.btn-lg{padding:16px 32px;font-size:1.05rem;min-height:52px}.btn-block{width:100%}.btn-icon{padding:8px;min-height:40px;min-width:40px;border-radius:var(--radius-md)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.input-group{margin-bottom:var(--spacing-md)}.input-label{display:block;font-size:.85rem;font-weight:500;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.input,.textarea,.select{width:100%;padding:12px 16px;border:2px solid var(--border-light);border-radius:var(--radius-md);font-family:var(--font-cn);font-size:.95rem;color:var(--text-primary);background:var(--bg-card);transition:border-color var(--transition-fast);min-height:44px}.input:focus,.textarea:focus,.select:focus{outline:none;border-color:var(--orange-400);box-shadow:0 0 0 3px #ffb06b33}.input::placeholder,.textarea::placeholder{color:var(--text-muted)}.textarea{min-height:80px;resize:vertical;line-height:1.5}.select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237d5a4a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.tag{display:inline-flex;align-items:center;padding:4px 10px;border-radius:var(--radius-full);font-size:.75rem;font-weight:500;background:var(--orange-100);color:var(--orange-600);border:1px solid var(--orange-200)}.tag-tone{background:#e8f5e9;color:#2e7d32;border-color:#c8e6c9}.tag-error{background:#ffebee;color:#c62828;border-color:#ffcdd2}.tag-stubborn{background:#fff3e0;color:#e65100;border-color:#ffe0b2}.badge{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 6px;border-radius:var(--radius-full);font-size:.7rem;font-weight:700;background:var(--red-400);color:var(--text-inverse)}.divider{height:1px;background:var(--border-light);margin:var(--spacing-md) 0}.progress-bar{height:6px;background:var(--orange-100);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--orange-400),var(--orange-500));border-radius:3px;transition:width var(--transition-normal)}.modal-overlay{position:fixed;inset:0;background:var(--bg-overlay);z-index:1000;display:flex;align-items:flex-end;justify-content:center;animation:fadeIn .2s ease}.modal-content{background:var(--bg-card);border-radius:var(--radius-xl) var(--radius-xl) 0 0;width:100%;max-width:480px;max-height:85vh;overflow-y:auto;padding:var(--spacing-xl);animation:slideUp .3s ease}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-lg)}.modal-header h2{font-size:1.15rem}.modal-close{background:none;border:none;font-size:1.5rem;color:var(--text-muted);cursor:pointer;padding:var(--spacing-xs)}.tabs{display:flex;gap:var(--spacing-xs);background:var(--orange-100);border-radius:var(--radius-full);padding:3px;margin-bottom:var(--spacing-lg)}.tab{flex:1;padding:8px 12px;border:none;border-radius:var(--radius-full);background:transparent;font-family:var(--font-cn);font-size:.85rem;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);text-align:center;min-height:36px}.tab.active{background:var(--orange-400);color:var(--text-inverse);box-shadow:var(--shadow-sm)}.list-item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);border-bottom:1px solid var(--border-light);transition:background var(--transition-fast)}.list-item:last-child{border-bottom:none}.list-item:active{background:var(--orange-50)}.list-item-content{flex:1;min-width:0}.list-item-title{font-weight:500;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.list-item-subtitle{font-size:.8rem;color:var(--text-muted);margin-top:2px}.list-item-action{flex-shrink:0}.chip-group{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.chip{padding:8px 16px;border-radius:var(--radius-full);border:2px solid var(--border-medium);background:var(--bg-card);font-family:var(--font-cn);font-size:.85rem;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);min-height:40px;display:inline-flex;align-items:center}.chip.selected{border-color:var(--orange-400);background:var(--orange-100);color:var(--orange-600);font-weight:500}.chip:active{transform:scale(.95)}.search-bar{position:relative;margin-bottom:var(--spacing-md)}.search-bar input{width:100%;padding:10px 16px 10px 40px;border:2px solid var(--border-light);border-radius:var(--radius-full);font-family:var(--font-cn);font-size:.9rem;background:var(--bg-card);color:var(--text-primary);min-height:44px}.search-bar input:focus{outline:none;border-color:var(--orange-400)}.search-bar .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);font-size:1rem;color:var(--text-muted);pointer-events:none}.fab{position:fixed;bottom:calc(var(--nav-height) + var(--safe-bottom) + 16px);right:max(16px,calc((100vw - 480px)/2 + 16px));width:56px;height:56px;border-radius:50%;background:var(--orange-400);color:var(--text-inverse);border:none;font-size:1.5rem;cursor:pointer;box-shadow:var(--shadow-lg);display:flex;align-items:center;justify-content:center;z-index:50;transition:all var(--transition-fast)}.fab:active{transform:scale(.9);box-shadow:var(--shadow-md)}.toast-container{position:fixed;top:16px;left:50%;transform:translate(-50%);z-index:2000;display:flex;flex-direction:column;gap:var(--spacing-sm);pointer-events:none;max-width:400px;width:calc(100% - 32px)}.toast{background:var(--brown-800);color:var(--text-inverse);padding:12px 20px;border-radius:var(--radius-md);font-size:.9rem;box-shadow:var(--shadow-lg);animation:slideUp .3s ease,fadeIn .3s ease;pointer-events:auto;text-align:center}.toast-success{background:var(--green-600)}.toast-error{background:var(--red-500)}.quiz-options{display:flex;flex-direction:column;gap:var(--spacing-sm)}.quiz-option{width:100%;padding:14px 20px;border:2px solid var(--border-light);border-radius:var(--radius-md);background:var(--bg-card);font-family:var(--font-cn);font-size:1rem;color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);text-align:left;min-height:48px;display:flex;align-items:center;gap:var(--spacing-md)}.quiz-option:active{transform:scale(.98)}.quiz-option.correct{border-color:var(--green-500);background:#e8f5e9;color:#2e7d32}.quiz-option.wrong{border-color:var(--red-400);background:#ffebee;color:#c62828;animation:shake .3s ease}.quiz-option.selected{border-color:var(--orange-400);background:var(--orange-100)}.flashcard{perspective:1000px;width:100%;min-height:240px;cursor:pointer;margin:var(--spacing-lg) 0}.flashcard-inner{position:relative;width:100%;height:100%;min-height:240px;transition:transform .5s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;min-height:240px;backface-visibility:hidden;border-radius:var(--radius-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-xl);box-shadow:var(--shadow-md)}.flashcard-front{background:var(--bg-card);border:2px solid var(--border-light)}.flashcard-back{background:linear-gradient(135deg,var(--orange-100),var(--orange-200));border:2px solid var(--orange-300);transform:rotateY(180deg)}.flashcard-hint{font-size:.8rem;color:var(--text-muted);margin-top:var(--spacing-md)}.fsrs-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-sm);margin-top:var(--spacing-lg)}.fsrs-btn{padding:12px 8px;border:none;border-radius:var(--radius-md);font-family:var(--font-cn);font-size:.8rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);min-height:48px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px}.fsrs-btn:active{transform:scale(.95)}.fsrs-btn-again{background:#ffebee;color:#c62828}.fsrs-btn-hard{background:#fff3e0;color:#e65100}.fsrs-btn-good{background:#e8f5e9;color:#2e7d32}.fsrs-btn-easy{background:#e3f2fd;color:#1565c0}.fsrs-btn .interval{font-size:.65rem;opacity:.7}.consonant-card{background:var(--bg-card);border:2px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--spacing-md);text-align:center;cursor:pointer;transition:all var(--transition-fast);min-height:80px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}.consonant-card:active{transform:scale(.95)}.consonant-card .char{font-family:var(--font-thai);font-size:1.8rem;font-weight:600}.consonant-card .name{font-size:.7rem;color:var(--text-muted)}.consonant-card.high{border-color:#ef9a9a;background:#ffebee}.consonant-card.mid{border-color:#a5d6a7;background:#e8f5e9}.consonant-card.low{border-color:#90caf9;background:#e3f2fd}.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-md)}.quick-item{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);text-decoration:none;color:var(--text-primary)}.quick-item:active{transform:scale(.95);box-shadow:var(--shadow-md)}.quick-item .icon{font-size:1.8rem}.quick-item .label{font-size:.8rem;font-weight:500;text-align:center}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;background:var(--bg-card);border-top:1px solid var(--border-light);display:flex;justify-content:space-around;align-items:center;padding:8px 0 calc(8px + var(--safe-bottom));z-index:200;box-shadow:0 -2px 10px #0000000d}.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;background:none;border:none;cursor:pointer;padding:4px 12px;border-radius:var(--radius-md);transition:all var(--transition-fast);color:var(--text-muted);min-width:48px}.nav-item.active{color:var(--orange-500)}.nav-item.active .nav-icon{transform:scale(1.1)}.nav-icon{font-size:1.3rem;transition:transform var(--transition-fast)}.nav-label{font-size:.65rem;font-weight:500}@media(max-width:480px){.page-content{padding:var(--spacing-md)}}