:root{--primary: #6CCB5F;--error: #FF6B6B;--background: #F8F9FA;--text: #2D3436;--highlight: #FFD93D}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--background);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button{padding:25px;border:none;border-radius:15px;background:#fff;font-size:1.4rem;font-weight:500;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 6px #0000001a;position:relative;overflow:hidden}button:not([disabled]):hover{transform:translateY(-2px);box-shadow:0 6px 12px #00000026}button:active{transform:scale(.98)}button:after{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:#fff3;opacity:0;transition:opacity .3s}button:not([disabled]):hover:after{opacity:1}button.correct{background:var(--primary);color:#fff;animation:bounce .5s}button.incorrect{background:var(--error);color:#fff;animation:shake .5s}.logout-button{background-color:transparent;color:var(--text);border:1px solid #e0e0e0;padding:8px 15px;border-radius:5px;font-size:1.2rem;cursor:pointer;transition:all .3s;box-shadow:none}.logout-button:hover{background-color:#f8f8f8;border-color:#d0d0d0}.auth-page button[type=submit]{background:var(--primary);color:#fff;padding:12px;border-radius:8px;font-size:1.2rem;font-weight:500;cursor:pointer;transition:background .3s;margin-top:10px}.auth-page button[type=submit]:hover{background:#5bb951}.auth-tabs button{flex:1;background:none;border:none;padding:10px;font-size:1.2rem;cursor:pointer;color:#777;box-shadow:none}.auth-tabs button.active{color:var(--primary);font-weight:700;border-bottom:2px solid var(--primary)}.auth-tabs button:hover{background:#00000008}@media (max-width: 768px){button{padding:20px;font-size:1.2rem}}.app-header{background-color:#fff;box-shadow:0 2px 10px #0000001a;padding:15px 0;position:relative;z-index:100;grid-row:1}.header-content{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center}.logo{font-size:1.8rem;font-weight:700;color:var(--primary)}.nav-links{display:flex;gap:20px}.nav-link{text-decoration:none;color:var(--text);font-weight:500;padding:8px 12px;border-radius:5px;font-size:1.2rem;transition:background-color .3s}.nav-link:hover{background-color:#6ccb5f1a}.user-section{display:flex;align-items:center;gap:15px}.username{font-weight:500;font-size:1.2rem}@media (max-width: 768px){.header-content{flex-direction:column;gap:15px;padding:10px}.nav-links,.user-section{width:100%;justify-content:center}}.word-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin:30px auto;max-width:600px}.progress-indicator{position:fixed;top:20px;right:20px;background:#fffffff2;padding:12px 24px;border-radius:30px;box-shadow:0 4px 20px #0000001a;font-weight:700;display:flex;align-items:center;gap:8px;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:2px solid #e0e0e0;font-size:1.3rem;color:#2d3436}.progress-indicator:before{content:"⭐";font-size:1.4rem}@media (max-width: 768px){.word-grid{grid-template-columns:repeat(2,1fr);gap:10px}}.session-stats{display:flex;gap:15px;background:#fffc;padding:8px 15px;border-radius:20px;box-shadow:0 2px 8px #0000001a;margin-left:15px}.stat{font-size:1.3rem;display:flex;align-items:center;gap:6px;font-weight:600}.correct-stat{color:#2ecc71}.incorrect-stat{color:#e74c3c}@media (max-width: 768px){.session-stats{margin:10px auto;justify-content:center;width:fit-content}.stat{font-size:1.2rem}}.activity-calendar-container{margin-top:40px;background:#fff;padding:20px;border-radius:10px;box-shadow:0 2px 10px #0000001a}.activity-calendar h3{margin-top:0;margin-bottom:20px;color:var(--text)}.activity-calendar{display:flex;flex-direction:column;align-items:center}.calendar-grid{display:flex;gap:2px;overflow-x:auto;padding-bottom:10px;margin:0 auto;max-width:100%}.calendar-week{display:flex;flex-direction:column;gap:2px}.calendar-day{width:10px;height:10px;border-radius:2px;transition:transform .2s}.calendar-day:hover{transform:scale(1.2)}.calendar-legend{margin-top:10px;display:flex;justify-content:center}.legend-item{display:flex;align-items:center;gap:5px;font-size:.8rem;color:#666}.legend-cell{width:10px;height:10px;border-radius:2px}@media (max-width: 768px){.calendar-grid{gap:2px}.calendar-day{width:10px;height:10px}}.auth-page{max-width:400px;margin:50px auto;padding:30px;background:#fff;border-radius:15px;box-shadow:0 4px 20px #0000001a}.auth-title{text-align:center;color:var(--primary);margin-bottom:20px;font-size:2rem}.auth-page form{display:flex;flex-direction:column;gap:15px}.form-group{display:flex;flex-direction:column;gap:5px}.form-group label{font-weight:500;font-size:1rem;color:#555}.auth-page input{padding:12px 15px;border:1px solid #e0e0e0;border-radius:8px;font-size:1.2rem;transition:border-color .3s}.auth-page input:focus{border-color:var(--primary);outline:none}.auth-tabs{display:flex;margin-bottom:20px;border-bottom:1px solid #e0e0e0}.auth-error{background-color:#ff6b6b1a;border-left:3px solid var(--error);padding:10px 15px;margin-bottom:15px;color:#d63031;border-radius:4px;font-size:1.1rem}.auth-success{background-color:#6ccb5f1a;border-left:3px solid var(--primary);padding:10px 15px;margin-bottom:15px;color:var(--primary);border-radius:4px;font-size:1.1rem}.learn-page{padding:20px;max-width:800px;margin:0 auto;text-align:center}h1{font-size:2.5rem;color:#2d3436;margin-bottom:2rem;text-shadow:2px 2px 0px rgba(255,255,255,.5)}@media (max-width: 768px){h1{font-size:2rem}}.progress-page{padding:20px;max-width:800px;margin:0 auto}.stats-container{background:#fff;padding:20px;border-radius:10px;box-shadow:0 2px 10px #0000001a;margin-bottom:20px}.stats-summary{display:flex;flex-direction:column;gap:10px}.stats-summary p{font-size:1.2rem;margin:0}.root-container{display:grid;grid-template-rows:auto 1fr;height:100vh;overflow:hidden}.app-content{grid-row:2;overflow-y:auto}.app-content.with-header{padding-top:20px}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes shake{0%{transform:translate(0)}25%{transform:translate(-8px)}50%{transform:translate(8px)}75%{transform:translate(-4px)}to{transform:translate(0)}}