:root{--color-action: #6C5CE7;--color-action-dark: #5849C2;--color-action-light: #EDE9FC;--color-growth: #00C853;--color-growth-dark: #00A344;--color-growth-light: #E0F8E9;--color-background: #F8F9FB;--color-surface: #FFFFFF;--color-surface-dark: #E2E6EB;--color-nav: #B8D4E8;--color-nav-dark: #8BB8D4;--color-text-primary: #1A1A1A;--color-text-secondary: #4A5568;--color-text-light: #FFFFFF;--color-text-emphasis: #2D3436;--color-primary: var(--color-action);--color-primary-dark: var(--color-action-dark);--color-primary-light: var(--color-action-light);--color-success: var(--color-growth);--color-success-light: var(--color-growth-light);--shadow-card: 0 2px 8px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.04);--shadow-card-hover: 0 8px 16px rgba(0,0,0,.1), 0 12px 24px rgba(0,0,0,.06);--shadow-button: 0 4px 12px rgba(108, 92, 231, .3);--shadow-button-hover: 0 6px 16px rgba(108, 92, 231, .4)}*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;font-size:16px;line-height:1.5;background:var(--color-background);color:var(--color-text-primary)}.app-layout{min-height:100vh}.app-nav{display:flex;align-items:center;justify-content:space-between;position:relative;padding:.75rem 1.5rem;background:linear-gradient(to bottom right,#b2dcf0,#6c5ce7)}.nav-brand{font-size:1.25rem;font-weight:700;color:var(--color-text-primary)}.nav-links{display:flex;gap:2.5rem;position:absolute;left:50%;transform:translate(-50%)}.nav-links a{color:var(--color-text-primary);text-decoration:none;font-size:1.1rem;font-weight:500;padding:.25rem .75rem;border-radius:6px;transition:all .2s ease}.nav-links a:hover{background:#6c5ce733;color:var(--color-action-dark);text-decoration:none;transform:scale(1.02)}.nav-right{display:flex;align-items:center;gap:.75rem}.nav-user{color:var(--color-text-primary);opacity:.9}.app-nav .btn{background:transparent;color:var(--color-text-primary);border:1px solid var(--color-text-secondary)}.app-nav .btn:hover{background:#0000000d;border-color:var(--color-text-primary)}.app-main{padding:1.5rem;max-width:900px;margin:0 auto}.page-title{margin-top:0;margin-bottom:1rem;font-weight:700;color:var(--color-text-primary)}.form{max-width:360px;display:flex;flex-direction:column;gap:1rem}.login-page{min-height:100vh;display:flex;justify-content:center;align-items:flex-start;padding-top:25vh;background:var(--color-surface)}.login-container{width:100%;max-width:360px;padding:2rem;background:var(--color-background);border:1px solid var(--color-surface-dark);border-radius:8px;box-shadow:var(--shadow-card-hover)}.login-container .page-title{text-align:center;margin-bottom:1.5rem}.login-container .form{max-width:100%}.input-group{display:flex;flex-direction:column;gap:.25rem}.input-group label{font-weight:600;color:var(--color-text-primary)}.input-group input{padding:.5rem;font-size:1rem;border:1px solid var(--color-surface-dark);border-radius:4px;transition:border-color .2s ease}.input-group input:focus{outline:none;border-color:var(--color-primary)}.btn{padding:.5rem 1rem;font-size:1rem;font-weight:500;border-radius:6px;cursor:pointer;border:none;transition:all .2s ease}.btn-primary{background:var(--color-action);color:var(--color-text-light);box-shadow:var(--shadow-button)}.btn-primary:hover{background:var(--color-action-dark);transform:scale(1.02);box-shadow:var(--shadow-button-hover);filter:brightness(1.05)}.btn-primary:active{transform:scale(.98)}.btn-secondary{background:var(--color-surface);color:var(--color-text-primary);border:1px solid var(--color-surface-dark)}.btn-secondary:hover{background:var(--color-action-light);border-color:var(--color-action);transform:scale(1.02)}.btn-secondary:active{transform:scale(.98)}.card{border:1px solid var(--color-surface-dark);border-radius:8px;padding:1.25rem;margin-bottom:1rem;background:var(--color-surface);box-shadow:var(--shadow-card);transition:box-shadow .2s ease,transform .2s ease}.card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.card-title{margin-top:0;margin-bottom:.75rem;font-weight:700;color:var(--color-text-primary)}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{padding:.5rem .75rem;text-align:left;border-bottom:1px solid var(--color-surface-dark)}th{background:var(--color-surface);font-weight:700;color:var(--color-text-primary)}.chat-placeholder{border:1px solid var(--color-surface-dark);border-radius:8px;min-height:300px;padding:1rem;background:var(--color-surface)}.chat-timer{font-size:.9rem;color:var(--color-text-secondary);margin-bottom:1rem}.progress-list{list-style:none;padding:0;margin:0}.progress-list li{padding:.75rem;margin:-.5rem -.5rem .25rem;border-bottom:1px solid var(--color-surface-dark);border-radius:6px;transition:background-color .2s ease;cursor:pointer}.progress-list li:hover{background-color:var(--color-primary-light)}.progress-list li:last-child{border-bottom:none;margin-bottom:-.5rem}.progress-bar{height:8px;background:var(--color-surface-dark);border-radius:4px;overflow:hidden;margin-top:.25rem}.progress-bar-fill{height:100%;background:var(--color-growth);border-radius:4px;transition:width .3s ease}.dashboard-grid{display:grid;grid-template-columns:2fr 1fr;gap:1.5rem}.dashboard-main,.dashboard-sidebar{display:flex;flex-direction:column;gap:1rem}.speaking-assignment{display:flex;flex-direction:column;gap:.75rem}.speaking-title{margin:0;font-size:1.25rem;font-weight:600;color:var(--color-text-primary)}.speaking-topic{margin:0;font-weight:600;color:var(--color-primary)}.speaking-description{margin:0;color:var(--color-text-secondary)}.speaking-meta{display:flex;gap:1rem}.speaking-duration{font-size:.875rem;color:var(--color-text-secondary);background:var(--color-primary-light);padding:.25rem .5rem;border-radius:4px}.no-assignment,.no-areas,.no-assignments{color:var(--color-text-secondary);font-style:italic;margin:0}.mastery-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:1rem}.mastery-item{padding:.75rem;border-bottom:1px solid var(--color-surface-dark);border-radius:6px;margin:-.5rem -.5rem .5rem;transition:background-color .2s ease;cursor:pointer}.mastery-item:hover{background-color:var(--color-primary-light)}.mastery-item:last-child{border-bottom:none;margin-bottom:-.5rem}.mastery-header{display:flex;justify-content:space-between;align-items:center;gap:1rem}.mastery-info{flex:1}.mastery-skill{font-weight:700;font-size:1rem;color:var(--color-text-emphasis);display:block;margin-bottom:.25rem}.mastery-suggestion{margin:0;font-size:.9rem;line-height:1.4;color:var(--color-text-primary)}.assignment-checklist{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.75rem}.checklist-item{display:flex;flex-direction:column;gap:.25rem;padding:.5rem;border-radius:6px;transition:background-color .2s ease;cursor:pointer}.checklist-item:hover{background-color:var(--color-primary-light)}.checklist-item.checked{background-color:var(--color-growth-light)}.checklist-item.checked:hover{background-color:var(--color-growth-dark);background-color:#00c85326}.checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer}.checkbox-label input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:var(--color-growth)}.checkbox-label span.completed{text-decoration:line-through;color:var(--color-text-secondary)}.due-date{font-size:.75rem;color:var(--color-text-secondary);margin-left:26px}@media (max-width: 768px){.dashboard-grid{grid-template-columns:1fr}}