:root{--primary-color: #4CAF50;--primary-dark: #388E3C;--primary-light: #C8E6C9;--accent-color: #FFC107;--text-color: #333333;--bg-color: #f5fffa;--white: #FFFFFF;--error-color: #E53935;--font-family: "M PLUS Rounded 1c", sans-serif;--shadow: 0 4px 6px rgba(0, 0, 0, .1);--radius: 12px}*{box-sizing:border-box}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-color);margin:0;padding:3.5rem 0;line-height:1.6;display:flex;flex-direction:column;min-height:100vh}header{background-color:var(--primary-color);color:var(--white);padding:1rem;text-align:center;box-shadow:var(--shadow);display:flex;justify-content:center;align-items:center;position:relative}header h1{margin:0;font-size:1.5rem}#settings-btn{position:absolute;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer}main{flex:1;padding:1rem;max-width:800px;margin:0 auto;width:100%}.screen{display:none;flex-direction:column;gap:1.5rem;animation:fadeIn .3s ease-in-out;overflow-y:auto;padding-bottom:2rem}.screen.active{display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}h2{color:var(--primary-dark);text-align:center;margin-bottom:.5rem}.hidden{display:none!important}.selection-group{display:flex;flex-direction:column;gap:1rem}button{font-family:var(--font-family);cursor:pointer;border:none;outline:none;transition:transform .1s,background-color .2s}button:active{transform:scale(.98)}.textbook-btn,.grade-btn{background-color:var(--white);border:2px solid var(--primary-color);color:var(--primary-color);padding:1rem;border-radius:var(--radius);font-size:1.2rem;font-weight:700;box-shadow:var(--shadow)}.textbook-btn.selected,.grade-btn.selected{background-color:var(--primary-color);color:var(--white)}.screen-header-stack{display:flex;flex-direction:column;align-items:flex-start;gap:.5rem;width:100%;position:relative;margin-bottom:.5rem;padding-left:.5rem}.screen-header-stack #back-to-setup{align-self:flex-start}.small-btn{font-size:.9rem;padding:.5rem 1rem}.unit-selection-grid{display:grid;grid-template-columns:1fr 200px;justify-content:center;gap:2rem;height:60vh}.units-column{display:flex;flex-direction:column;gap:.5rem;overflow-y:hidden;height:100%}.units-list{display:flex;flex-direction:column;align-items:stretch;gap:.5rem;height:100%;padding:.5rem 1rem .5rem .5rem;overflow-y:scroll;scrollbar-gutter:stable;border:4px solid var(--primary-light);border-radius:var(--radius);background-color:#fff;box-shadow:inset 0 0 10px #0000000d}.action-panel{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:1.5rem}#total-words-display{font-size:1.8rem;font-weight:700;color:var(--primary-dark);text-align:center;background-color:var(--white);padding:1rem;border-radius:var(--radius);box-shadow:0 2px 4px #0000000d;width:100%}.unit-checkbox-label{display:flex;align-items:center;justify-content:flex-start;gap:.5rem;background-color:var(--white);padding:.8rem;border-radius:8px;box-shadow:0 1px 2px #0000000d;cursor:pointer;font-weight:700;font-size:.95rem;transition:background-color .2s;min-height:50px;line-height:1.4}.unit-checkbox-label:hover{background-color:#f1f8e9}.unit-info{display:flex;align-items:baseline;gap:.5rem;flex:1}.unit-pages{color:#888;font-size:.85rem;font-weight:400}.unit-checkbox-label input{margin-right:.5rem;transform:scale(1.2);accent-color:var(--primary-color)}.primary-btn{background-color:var(--primary-color);color:var(--white);padding:1rem;border-radius:50px;font-size:1rem;font-weight:700;box-shadow:var(--shadow);width:100%;display:block}@media(max-width:600px){.unit-selection-grid{grid-template-columns:1fr;height:auto}.units-list{max-height:40vh}.action-panel{flex-direction:row;flex-wrap:wrap;gap:1rem}#total-words-display{width:100%;margin-bottom:.5rem}.primary-btn{flex:1;min-width:140px}}.audio-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;margin-left:10px;vertical-align:middle}.primary-btn.sort-theme{background-color:var(--accent-color);color:#333}.primary-btn:disabled{background-color:#ccc;cursor:not-allowed;box-shadow:none;color:#666}.secondary-btn{background-color:var(--white);border:2px solid var(--primary-color);color:var(--primary-color);padding:.8rem 1.5rem;border-radius:50px;font-size:1rem;font-weight:700}.quiz-progress{display:flex;flex-direction:column;align-items:center;gap:.5rem;font-size:1rem;color:#666;margin-bottom:1rem}.question-header{text-align:center;margin:2rem 0;display:flex;justify-content:center;align-items:center;gap:10px}#question-text{font-size:2rem;margin:0;display:inline-block}.options-grid{display:grid;grid-template-columns:1fr;gap:1rem}.choice-btn{background-color:var(--white);border:2px solid #ddd;padding:1rem;border-radius:var(--radius);font-size:1.1rem;text-align:center}.choice-btn:hover{background-color:#f0f0f0}.choice-btn.correct{background-color:var(--primary-light);border-color:var(--primary-color);color:var(--primary-dark)}.choice-btn.wrong{background-color:#ffebee;border-color:var(--error-color);color:var(--error-color)}#sorting-area{display:flex;justify-content:center;gap:.5rem;margin-bottom:2rem;min-height:50px;flex-wrap:wrap}.sort-slot{width:52px;height:52px;border-bottom:2px solid #ccc;display:flex;justify-content:center;align-items:center;font-size:1.5rem;font-weight:700;cursor:pointer;transition:all .2s;-webkit-user-select:none;user-select:none;font-family:serif}.sort-slot:hover:not(.fixed-slot){background-color:#0000000d}.sort-slot.fixed-slot{background-color:#f0f0f0;color:#555;border-bottom:2px solid #999;cursor:default}.letter-chip{background-color:var(--primary-light);color:var(--primary-dark);padding:.8rem;border-radius:8px;font-size:1.2rem;font-weight:700;box-shadow:0 2px 4px #0000001a;min-width:52px;text-align:center;font-family:serif}.letter-chip.used{background-color:#ddd;color:#999;box-shadow:none;transform:none}.score-display{font-size:3rem;text-align:center;color:var(--primary-color);font-weight:700}.action-buttons{display:flex;flex-direction:column;gap:1rem;align-items:center;width:100%}.action-buttons .primary-btn{padding:1.5rem 1rem;font-size:1.2rem;letter-spacing:.05em}.app-footer{display:flex;justify-content:space-around;align-items:center;background-color:var(--white);padding:.8rem;box-shadow:0 -2px 10px #0000000d;border-top:1px solid #eee;margin-top:auto;width:100%}.nav-icon-btn{background:none;border:none;display:flex;flex-direction:column;align-items:center;gap:4px;padding:.8rem;cursor:pointer;color:#666}.nav-icon{width:32px;height:32px;object-fit:contain}.nav-icon-emoji{font-size:1.5rem}.nav-label{font-size:.7rem;font-weight:700}.user-nav-container{position:relative}.user-avatar-placeholder{font-size:1.5rem;background:#eee;width:36px;height:36px;border-radius:50%;display:flex;justify-content:center;align-items:center}.user-menu{position:absolute;bottom:110%;left:50%;transform:translate(-50%);background:#fff;border:1px solid #ddd;border-radius:8px;box-shadow:0 4px 12px #00000026;width:180px;z-index:100;padding:.8rem}.user-menu ul{list-style:none;padding:0;margin:0 0 .5rem;max-height:150px;overflow-y:auto}.user-menu li{padding:.8rem;border-bottom:1px solid #f0f0f0;cursor:pointer}.user-menu li:hover{background-color:#f9f9f9}.user-menu li.current{font-weight:700;color:var(--primary-color)}.add-user-btn{width:100%;padding:.8rem;background-color:var(--primary-light);color:var(--primary-dark);border:none;border-radius:4px;cursor:pointer;font-size:.9rem}.stats-filter{display:flex;justify-content:center;gap:1rem;margin-bottom:1rem;background:#fff;padding:1rem;border-radius:var(--radius);box-shadow:0 2px 4px #0000000d}.filter-row{display:flex;align-items:center;gap:.5rem}.filter-row span{font-size:1.2rem;font-weight:700}.stats-filter select{font-size:1.1rem;padding:.6rem;border:2px solid var(--primary-light);border-radius:8px;background-color:var(--white);color:var(--text-color);cursor:pointer}.stats-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:1rem;padding-bottom:2rem}.stats-card{background:#fff;padding:1rem;border-radius:var(--radius);box-shadow:0 2px 4px #0000000d}.stats-unit-title{font-weight:700;margin-bottom:.5rem;color:var(--primary-dark)}.progress-row{display:flex;align-items:center;gap:1rem;margin-bottom:.5rem;font-size:.9rem}.progress-label{min-width:60px}.progress-bar-bg{flex:1;height:10px;background:#eee;border-radius:5px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--primary-color);width:0%;transition:width .5s ease}.progress-bar-fill.sort{background:var(--accent-color)}.progress-text{min-width:40px;text-align:right}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal-content{background:#fff;padding:2rem;border-radius:var(--radius);width:90%;max-width:400px;position:relative;box-shadow:0 4px 20px #0003;max-height:90vh;overflow-y:auto}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:5px}::-webkit-scrollbar-thumb{background:var(--primary-light);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--primary-color)}.close-btn{position:absolute;top:.5rem;right:1rem;font-size:2rem;cursor:pointer;color:#999}.calendar-controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;background:#eee;border:1px solid #eee}.calendar-cell{background:#fff;aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:.8rem;position:relative}.calendar-header{font-weight:700;background:#f9f9f9;aspect-ratio:auto;padding:5px 0}.calendar-count{font-size:.7rem;background:var(--primary-light);color:var(--primary-dark);padding:1px 4px;border-radius:4px;margin-top:2px}.calendar-today{border:2px solid var(--accent-color)}.calendar-legend{font-size:.8rem;text-align:right;color:#888;margin-top:.5rem}.promo-btn{transition:transform .2s,box-shadow .2s}.promo-btn:hover{transform:translateY(-2px);box-shadow:0 6px 12px #00000026!important;background-color:#fff9c4!important}.promo-btn:active{transform:translateY(0);box-shadow:0 2px 4px #0000001a!important}#wrong-answer-section{width:100%;margin:1rem 0;text-align:center}.wrong-list{list-style:none;padding:0;margin:.5rem 0 1rem;max-height:150px;overflow-y:auto;border:1px solid #ffccbc;background-color:#fff3e0;border-radius:var(--radius);text-align:left}.wrong-list li{padding:.5rem 1rem;border-bottom:1px solid #ffe0b2;color:var(--error-color);font-weight:700}.wrong-list li:last-child{border-bottom:none}.text-btn{background:none;border:none;color:var(--primary-color);text-decoration:underline;cursor:pointer;font-size:1rem;padding:.8rem}.text-btn:hover{color:var(--primary-dark)}#quiz-screen{display:flex;flex-direction:column;justify-content:center;min-height:calc(100vh - 80px);position:relative;padding-bottom:60px}#quit-quiz-btn{position:fixed;top:110px;left:20px;background-color:var(--white);border:2px solid #ccc;color:#666;padding:.8rem 1.5rem;border-radius:50px;box-shadow:0 2px 5px #0000001a;z-index:900;font-weight:700}#question-container{margin:1rem 0 2rem}#mascot-container{position:fixed;top:110px;right:20px;z-index:500;display:flex;flex-direction:column;align-items:flex-end;pointer-events:none}#mascot-img{width:80px;height:auto;pointer-events:auto;cursor:pointer;transition:transform .3s;border-radius:50%;box-shadow:0 4px 6px #0000001a}#mascot-img:hover{transform:scale(1.1) rotate(5deg)}#mascot-speech-bubble{position:absolute;top:100%;right:0;margin-top:10px;width:max-content;max-width:200px;background:#fff;padding:.5rem 1rem;border-radius:12px;border:2px solid var(--primary-color);font-size:.9rem;font-weight:700;color:var(--primary-dark);box-shadow:0 4px 8px #00000026;pointer-events:auto;animation:popIn .3s ease-out}#mascot-speech-bubble:after{content:"";position:absolute;bottom:100%;right:30px;border-width:8px;border-style:solid;border-color:transparent transparent var(--primary-color) transparent}.units-list{scrollbar-width:thin;scrollbar-color:var(--primary-color) #cccccc}.units-list::-webkit-scrollbar{width:20px;background-color:#ccc}.units-list::-webkit-scrollbar-track{background-color:#ccc;border-radius:0 0 var(--radius) 0}.units-list::-webkit-scrollbar-thumb{background-color:var(--primary-color);border-radius:10px;border:4px solid #cccccc;min-height:40px}.units-list::-webkit-scrollbar-thumb:hover{background-color:var(--primary-dark)}#print-area{display:none}@media print{body *{visibility:hidden}#print-area,#print-area *{visibility:visible}#print-area{display:block;position:absolute;left:0;top:0;width:100%;color:#000;background:#fff}.print-section{width:100%;margin-bottom:2rem}.print-header{text-align:center;margin-bottom:1rem;border-bottom:2px solid #333;padding-bottom:.5rem}.print-title{font-size:1.5rem;font-weight:700}.print-subtitle{font-size:1rem;margin-top:.5rem}.print-table{width:100%;border-collapse:collapse;font-size:12pt}.print-table th,.print-table td{border:1px solid #333;padding:8px;text-align:left}.print-table th{background-color:#f0f0f0!important;-webkit-print-color-adjust:exact;print-color-adjust:exact;text-align:center}.page-break{page-break-before:always;break-before:page;margin-top:2rem}}