/* Kno v3 — Components (Clean Dark) */

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:0.875rem;transition:all var(--transition-fast);white-space:nowrap;border:1px solid transparent}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:#FAFAFA;color:#09090B;border-color:#FAFAFA}
.btn-primary:hover{background:#E4E4E7;border-color:#E4E4E7}
.btn-secondary{background:transparent;color:var(--text-primary);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--bg-hover);border-color:var(--text-muted)}
.btn-ghost{background:transparent;color:var(--text-secondary);padding:8px 12px}
.btn-ghost:hover{color:var(--text-primary);background:var(--bg-hover)}
.btn-danger{background:var(--red-bg);color:var(--red);border:1px solid rgba(248,113,113,0.2)}
.btn-danger:hover{background:rgba(248,113,113,0.15)}
.btn-sage{background:var(--sage-bg);color:var(--sage);border:1px solid rgba(74,222,128,0.2)}
.btn-sage:hover{background:rgba(74,222,128,0.15)}
.btn-sm{padding:7px 14px;font-size:0.8rem}
.btn-lg{padding:13px 28px;font-size:0.95rem}

/* Badges */
.badge{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:var(--radius-full);font-size:0.72rem;font-weight:600;letter-spacing:0.02em}
.badge-dark{background:var(--bg-tertiary);color:var(--text-secondary);border:1px solid var(--border)}
.badge-accent{background:var(--accent-bg);color:var(--text-primary);border:1px solid var(--border)}
.badge-sage{background:var(--sage-bg);color:var(--sage)}
.badge-amber{background:var(--amber-bg);color:var(--amber)}
.badge-blue{background:var(--blue-bg);color:var(--blue)}
.badge-sm,.badge-pro,.badge-teacher{padding:2px 8px;font-size:0.65rem}
.badge-pro{background:var(--amber-bg);color:var(--amber)}
.badge-teacher{background:var(--sage-bg);color:var(--sage)}

/* Cards */
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;transition:all var(--transition)}
.card:hover{border-color:var(--border-focus)}
.card-flat{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);padding:14px;margin:8px 0}
.empty-state{text-align:center;padding:48px 24px;color:var(--text-muted)}
.empty-state svg{margin:0 auto 12px;opacity:0.3}
.empty-state h4{color:var(--text-secondary);margin-bottom:6px;font-weight:600}
.empty-state p{font-size:0.85rem}

/* Forms */
.form-group{margin-bottom:16px}
.form-label{display:block;font-size:0.82rem;font-weight:600;margin-bottom:6px;color:var(--text-secondary)}
.form-hint{font-size:0.78rem;color:var(--text-muted)}
.form-input,.form-textarea,.form-select{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-input);font-size:0.88rem;color:var(--text-primary);transition:var(--transition);outline:none}
.form-input:hover,.form-textarea:hover{border-color:var(--text-muted)}
.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(228,228,231,0.05)}
.form-input::placeholder,.form-textarea::placeholder{color:var(--text-muted)}
.form-textarea{resize:vertical;min-height:100px}
.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2352525B' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}
.form-check{display:flex;align-items:center;gap:8px;font-size:0.88rem;cursor:pointer}

/* Dividers */
.divider{height:1px;background:var(--border);margin:16px 0}
.maker-divider{height:1px;background:var(--border);margin:20px 0}

/* Tabs */
.tab-btn{display:inline-flex;align-items:center;gap:5px;padding:7px 14px;border-radius:var(--radius-md);font-size:0.78rem;font-weight:500;color:var(--text-muted);transition:var(--transition-fast);border:1px solid transparent}
.tab-btn:hover{color:var(--text-secondary);background:var(--bg-hover)}
.tab-btn.active{color:var(--text-primary);background:var(--bg-tertiary);border-color:var(--border)}

/* Sidebar */
.dash-layout{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;top:0;left:0;height:100vh;z-index:50;transition:transform var(--transition)}
.sidebar-header{padding:16px 18px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}
.sidebar-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem;letter-spacing:-0.02em}
.sidebar-close{display:none;color:var(--text-muted)}
.sidebar-nav{flex:1;overflow-y:auto;padding:12px}
.sidebar-section-label{font-size:0.68rem;font-weight:600;text-transform:uppercase;letter-spacing:0.06em;color:var(--text-muted);padding:16px 12px 6px;margin-top:4px}
.sidebar-nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--radius-md);font-size:0.85rem;color:var(--text-secondary);transition:var(--transition-fast);font-weight:500}
.sidebar-nav-item:hover{color:var(--text-primary);background:var(--bg-hover)}
.sidebar-nav-item.active{color:var(--text-primary);background:var(--bg-tertiary);font-weight:600}
.sidebar-divider{height:1px;background:var(--border);margin:8px 12px}
.sidebar-footer{padding:12px;border-top:1px solid var(--border)}
.sidebar-user{display:flex;align-items:center;gap:8px;padding:8px 12px;font-size:0.82rem;color:var(--text-secondary);font-weight:500}
.sidebar-footer-btn{display:flex;align-items:center;gap:8px;padding:8px 12px;width:100%;font-size:0.82rem;color:var(--text-muted);border-radius:var(--radius-sm);transition:var(--transition-fast)}
.sidebar-footer-btn:hover{color:var(--text-secondary);background:var(--bg-hover)}

/* Main content */
.dash-main{margin-left:var(--sidebar-width);flex:1;display:flex;flex-direction:column;min-height:100vh}
.dash-topbar{display:flex;align-items:center;gap:12px;padding:12px 24px;border-bottom:1px solid var(--border);background:var(--bg-primary);position:sticky;top:0;z-index:10}
.dash-menu-toggle{display:none;color:var(--text-muted)}
.dash-title{font-weight:600;font-size:0.9rem;color:var(--text-secondary)}
.dash-content{padding:24px;flex:1;overflow-y:auto}
.page-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px;flex-wrap:wrap}

/* Toast */
.toast-container{position:fixed;top:20px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:8px}
.toast{display:flex;align-items:center;gap:10px;padding:12px 18px;border-radius:var(--radius-md);background:var(--bg-card);border:1px solid var(--border);box-shadow:var(--shadow-lg);animation:fadeInDown 0.3s var(--ease);font-size:0.85rem;max-width:360px}
.toast.success{border-color:rgba(74,222,128,0.3);background:var(--sage-bg)}.toast.success svg{color:var(--sage)}
.toast.error{border-color:rgba(248,113,113,0.3);background:var(--red-bg)}.toast.error svg{color:var(--red)}
.toast-close{margin-left:auto;opacity:0.4;padding:2px}

/* Modal */
.modal-overlay{position:fixed;inset:0;background:var(--bg-overlay);z-index:100;display:none;align-items:center;justify-content:center;padding:20px}
.modal-overlay.active{display:flex}
.modal{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);max-width:460px;width:100%;box-shadow:var(--shadow-xl);animation:scaleIn 0.2s var(--ease)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--border)}
.modal-title{font-weight:700;font-size:1rem}
.modal-close{color:var(--text-muted)}
.modal-body{padding:22px}
.modal-footer{padding:16px 22px;border-top:1px solid var(--border);display:flex;gap:10px;justify-content:flex-end}

/* Progress */
.progress-bar{height:6px;background:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden}
.progress-fill{height:100%;border-radius:var(--radius-full);transition:width var(--transition)}
.progress-fill.sage{background:var(--sage)}
.progress-fill.amber{background:var(--amber)}

/* Decks grid */
.decks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.deck-card{display:flex;flex-direction:column;gap:8px;cursor:pointer}
.deck-card:hover{border-color:var(--text-muted)}
.deck-icon{width:40px;height:40px;border-radius:var(--radius-md);background:var(--accent-bg);display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}
.deck-actions{display:flex;gap:8px;margin-top:auto;padding-top:8px}

/* Notes */
.notes-list{display:flex;flex-direction:column;gap:10px}
.note-row{display:flex;align-items:center;gap:14px;cursor:pointer}
.note-row:hover{border-color:var(--text-muted)}
.note-icon{width:38px;height:38px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.notes-rendered{font-size:0.9rem;line-height:1.7;color:var(--text-secondary)}
.notes-rendered h1,.notes-rendered h2,.notes-rendered h3{color:var(--text-primary);margin:16px 0 8px}
.notes-rendered li{margin-left:20px;list-style:disc;margin-bottom:4px}
.notes-rendered strong{color:var(--text-primary)}

/* Question entry (quiz maker) */
.question-entry{padding:16px;margin:8px 0}
.question-entry .flex{flex-wrap:wrap}

/* Card entry (flashcard maker) */
.card-entry{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.card-entry .form-input{flex:1}

@media(max-width:768px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-close{display:block}
  .dash-main{margin-left:0}
  .dash-menu-toggle{display:block}
  .decks-grid{grid-template-columns:1fr}
}