:root{--primary-blue: #0d6efd;--primary-blue-hover: #0b5ed7;--bg-light: #f8f9fa;--border-color: #e9ecef;--text-dark: #212529;--text-muted: #6c757d;--count-green: #198754;--count-blue: #0d6efd;--count-red: #dc3545}*{box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;margin:0;padding:0;background-color:#fff;color:var(--text-dark);line-height:1.5}.app{min-height:100vh;display:flex;flex-direction:column}.navbar{display:flex;align-items:center;justify-content:space-between;padding:12px 32px;background-color:#f8f9fa;border-bottom:1px solid #dee2e6}.navbar-brand{display:flex;align-items:center;gap:8px;font-size:1.35rem;font-weight:700;color:#0d6efd;text-decoration:none}.navbar-brand span{color:#212529}.navbar-nav{display:flex;align-items:center;gap:20px;list-style:none;margin:0;padding:0}.nav-link{color:#495057;text-decoration:none;font-size:1rem;font-weight:400;cursor:pointer;transition:color .15s ease-in-out}.nav-link:hover{color:#0d6efd}.navbar-right{display:flex;align-items:center;gap:16px;font-size:.95rem;color:#6c757d}.btn-logout{background:none;border:1px solid #ced4da;padding:4px 12px;border-radius:4px;color:#495057;cursor:pointer;font-size:.9rem}.btn-logout:hover{background-color:#e9ecef}main.main-content{flex:1;max-width:980px;width:100%;margin:0 auto;padding:24px 20px}.decks-header-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid #e9ecef}.decks-table{width:100%;border-collapse:collapse}.decks-table tr{border-bottom:1px solid #f1f3f5}.decks-table td{padding:12px 8px;vertical-align:middle}.deck-name-link{color:#0d6efd;font-size:1.1rem;text-decoration:none}.deck-name-link:hover{text-decoration:underline}.deck-counts{text-align:right;font-weight:600;font-size:1rem;line-height:1.3}.count-green{color:var(--count-green)}.count-blue{color:var(--count-blue)}.count-red{color:var(--count-red)}.actions-dropdown{position:relative;display:inline-block}.btn-actions{background:none;border:none;color:#0d6efd;font-size:1rem;cursor:pointer;padding:4px 8px}.btn-actions:hover{text-decoration:underline}.dropdown-menu{position:absolute;right:0;top:100%;background:#fff;border:1px solid #dee2e6;box-shadow:0 4px 12px #0000001a;border-radius:4px;min-width:130px;z-index:10}.dropdown-item{display:block;width:100%;padding:8px 12px;text-align:left;background:none;border:none;font-size:.9rem;color:#212529;cursor:pointer;text-decoration:none}.dropdown-item:hover{background-color:#f8f9fa;color:#0d6efd}.study-container{display:flex;flex-direction:column;min-height:500px}.study-top-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.study-toolbar-left{display:flex;gap:8px}.btn-study-tool{background:#fff;border:1px solid #0d6efd;color:#0d6efd;padding:6px 16px;border-radius:6px;font-size:.9rem;cursor:pointer;transition:all .15s}.btn-study-tool:hover{background:#e7f1ff}.study-counts-right{font-size:1.1rem;font-weight:600}.card-viewer-area{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px;min-height:280px}.card-prompt{font-size:1.4rem;font-weight:500;color:#1a1a1a;max-width:750px;margin-bottom:20px}.card-divider{width:100%;max-width:750px;border:0;border-top:1px solid #e9ecef;margin:28px 0}.card-answer{font-size:1.25rem;color:#212529;max-width:750px;margin-top:10px}.code-box{width:100%;max-width:650px;margin:16px 0;text-align:left}.code-input{width:100%;min-height:100px;font-family:monospace;padding:12px;border:1px solid #ced4da;border-radius:6px;font-size:.95rem;resize:vertical}.study-bottom-bar{display:flex;justify-content:center;padding:24px 0 10px}.btn-show-answer{background-color:#0d6efd;color:#fff;border:none;padding:12px 36px;font-size:1.1rem;font-weight:500;border-radius:6px;cursor:pointer;box-shadow:0 2px 4px #0d6efd33;transition:background-color .15s}.btn-show-answer:hover{background-color:#0b5ed7}.rating-buttons-group{display:flex;gap:12px}.rating-col{display:flex;flex-direction:column;align-items:center}.rating-interval{font-size:.8rem;color:#6c757d;margin-bottom:4px}.btn-rating{background-color:#0d6efd;color:#fff;border:none;padding:10px 24px;font-size:1rem;font-weight:500;border-radius:6px;cursor:pointer;min-width:90px;transition:background-color .15s}.btn-rating:hover{background-color:#0b5ed7}.btn-rating.again{background-color:#0d6efd}.form-card{background:#f8f9fa;border:1px solid #e9ecef;padding:20px;border-radius:8px;margin-bottom:24px}.form-group{margin-bottom:14px;text-align:left}.form-group label{display:block;font-weight:500;margin-bottom:4px;font-size:.9rem}.form-control{width:100%;padding:8px 12px;border:1px solid #ced4da;border-radius:4px;font-size:.95rem}.btn-primary{background-color:#0d6efd;color:#fff;border:none;padding:8px 18px;border-radius:4px;font-size:.95rem;cursor:pointer}.btn-primary:hover{background-color:#0b5ed7}.empty-state{text-align:center;padding:60px 20px;color:#6c757d}.followups-wrapper{width:100%;max-width:750px;margin-top:28px;text-align:left}.btn-followups-toggle{background:none;border:none;color:#0d6efd;font-size:.9rem;cursor:pointer;padding:4px 0;display:inline-flex;align-items:center;gap:8px;transition:color .15s}.btn-followups-toggle:hover{color:#0b5ed7}.followups-badge{background-color:#0d6efd;color:#fff;border-radius:10px;font-size:.75rem;padding:1px 7px;font-weight:600}.followups-panel{margin-top:12px;border-top:1px solid #e9ecef;padding-top:16px}.followup-form{display:flex;gap:10px;margin-bottom:20px}.followup-input{flex:1;font-size:.9rem}.followups-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:14px}.followup-item{background:#f8f9fa;border:1px solid #e9ecef;border-radius:6px;padding:12px 14px}.followup-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}.followup-author{font-weight:600;font-size:.85rem;color:#212529}.followup-date{font-size:.78rem;color:#adb5bd}.followup-text{margin:0;font-size:.95rem;color:#343a40;line-height:1.5}.followup-answer-link{display:inline-block;margin-top:8px;font-size:.82rem;color:#198754;text-decoration:none;font-weight:500}.followup-answer-link:hover{text-decoration:underline}.followups-loading,.followups-empty{color:#6c757d;font-size:.9rem;margin:8px 0 0}