/* ─────────────────────────────────────
   RESET E BASE
   Remove margens/paddings padrão do navegador
   ───────────────────────────────────── */
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,sans-serif;background:#0f172a;color:#e2e8f0;min-height:100vh}

/* Telas: todas ocultas por padrão, JS mostra a certa */
.screen{display:none;flex-direction:column;min-height:100vh}

/* ─────────────────────────────────────
   TELAS DE AUTENTICAÇÃO (login, recuperar senha, nova senha)
   ───────────────────────────────────── */
#s-auth,#s-forgot,#s-reset{justify-content:center;align-items:center;padding:24px}
.auth-box{background:#1e293b;border:1px solid #334155;border-radius:16px;padding:28px;width:100%;max-width:360px}
.auth-logo{font-size:2.5rem;text-align:center;margin-bottom:8px}
.auth-title{font-size:1.2rem;font-weight:700;color:#38bdf8;text-align:center;margin-bottom:4px}
.auth-sub{font-size:.82rem;color:#64748b;text-align:center;margin-bottom:24px}
.auth-err{color:#f87171;font-size:.8rem;margin-bottom:10px;min-height:18px;text-align:center}
.auth-ok{color:#86efac;font-size:.8rem;margin-bottom:10px;min-height:18px;text-align:center}
.auth-toggle{text-align:center;margin-top:14px;font-size:.82rem;color:#64748b;cursor:pointer}
.auth-toggle span{color:#38bdf8}

/* ─────────────────────────────────────
   INPUTS E BOTÕES — usados em todo o app
   ───────────────────────────────────── */
.inp{width:100%;padding:10px 12px;border-radius:8px;border:1px solid #334155;background:#0f172a;color:#e2e8f0;font-size:.9rem;outline:none;margin-bottom:12px}
.inp:focus{border-color:#38bdf8}
textarea.inp{resize:vertical;min-height:90px;font-family:monospace;font-size:.85rem;line-height:1.5}
.inp-hint{font-size:.7rem;color:#475569;margin-top:-8px;margin-bottom:10px}
.inp-label{font-size:.78rem;color:#64748b;margin-bottom:6px;display:block}
.btn-p{width:100%;padding:11px;border-radius:8px;border:none;background:#0369a1;color:#fff;font-size:.9rem;font-weight:600;cursor:pointer;transition:.2s}
.btn-p:hover{background:#0284c7}
.btn-p:disabled{opacity:.5;cursor:not-allowed}
.btn-g{padding:11px 20px;border-radius:8px;border:1px solid #334155;background:none;color:#94a3b8;font-size:.9rem;cursor:pointer;font-weight:600}
.btn-g:hover{background:#1e293b}
.row{display:flex;gap:8px}

/* ─────────────────────────────────────
   APP PRINCIPAL — layout de duas colunas
   Sidebar à esquerda + conteúdo à direita
   ───────────────────────────────────── */
#s-app{flex-direction:row;min-height:100vh}

/* ─────────────────────────────────────
   SIDEBAR — lista de baralhos
   ───────────────────────────────────── */
.sidebar{width:260px;min-width:260px;background:#1e293b;border-right:1px solid #334155;display:flex;flex-direction:column;height:100vh;position:sticky;top:0}
.sidebar-hdr{padding:16px;border-bottom:1px solid #334155;display:flex;align-items:center;gap:10px}
.sidebar-logo{font-size:1.4rem}
.sidebar-title{font-size:1rem;font-weight:700;color:#f1f5f9;flex:1}
.sidebar-logout{background:none;border:none;color:#64748b;font-size:.75rem;cursor:pointer;padding:4px 8px;border-radius:6px;border:1px solid #334155}
.sidebar-logout:hover{color:#f87171;border-color:#f87171}
.sidebar-new{margin:8px;padding:9px;border-radius:8px;border:1px dashed #334155;background:none;color:#64748b;font-size:.82rem;cursor:pointer;width:calc(100% - 16px);text-align:left;display:flex;align-items:center;gap:8px;transition:.15s}
.sidebar-new:hover{border-color:#38bdf8;color:#38bdf8}

/* Item de baralho na sidebar */
.sd-item{border-radius:8px;margin-bottom:2px}
.sd-row{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;cursor:pointer;transition:.15s;position:relative}
.sd-row:hover{background:#334155}
.sd-row.active{background:#0c4a6e}
.sd-row.drag-over{background:#0c4a6e;border:2px dashed #38bdf8}
.sd-emoji{font-size:1.1rem;flex-shrink:0}
.sd-name{font-size:.85rem;color:#cbd5e1;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sd-count{font-size:.7rem;color:#475569;flex-shrink:0}
/* Sub-baralhos ficam indentados */
.sd-children{padding-left:16px}
/* Botões de ação (editar/apagar) aparecem só no hover */
.sd-actions{display:none;position:absolute;right:4px;top:50%;transform:translateY(-50%);gap:2px;background:#1e293b;border-radius:6px;padding:2px}
.sd-row:hover .sd-actions{display:flex}
.sd-act-btn{background:none;border:none;color:#475569;cursor:pointer;font-size:.8rem;padding:3px 5px;border-radius:4px}
.sd-act-btn:hover{color:#f87171;background:#334155}

/* Zona de drop na raiz — aparece ao arrastar baralho */
.root-dropzone{display:none;margin:8px;padding:12px;border:2px dashed #334155;border-radius:8px;text-align:center;font-size:.75rem;color:#475569;transition:.2s}
.root-dropzone.active{display:block;border-color:#38bdf8;color:#38bdf8}

/* ─────────────────────────────────────
   ÁREA PRINCIPAL — header + grid de cards
   ───────────────────────────────────── */
.main{flex:1;display:flex;flex-direction:column;min-height:100vh;overflow:hidden}
.main-hdr{background:#1e293b;border-bottom:1px solid #334155;padding:12px 20px;display:flex;align-items:center;gap:12px;flex-shrink:0}
.main-hdr-title{font-size:1rem;font-weight:700;color:#f1f5f9;flex:1}
.main-hdr-sub{font-size:.75rem;color:#64748b}
.hdr-btn{background:none;border:1px solid #334155;color:#64748b;font-size:.78rem;cursor:pointer;padding:6px 12px;border-radius:6px}
.hdr-btn:hover{border-color:#38bdf8;color:#38bdf8}
.main-body{flex:1;overflow-y:auto;padding:20px}

/* Breadcrumb — mostra o caminho do baralho atual */
.breadcrumb{display:flex;align-items:center;gap:6px;margin-bottom:16px;flex-wrap:wrap}
.bc-item{font-size:.8rem;color:#64748b;cursor:pointer}
.bc-item:hover{color:#38bdf8}
.bc-sep{color:#475569;font-size:.75rem}
.bc-current{font-size:.8rem;color:#94a3b8}

/* Grid de cards — colunas automáticas */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}

/* ─────────────────────────────────────
   CARD — item individual de estudo
   ───────────────────────────────────── */
.card-item{background:#1e293b;border:1px solid #334155;border-radius:10px;overflow:hidden;transition:.15s;cursor:grab;position:relative}
.card-item:hover{border-color:#38bdf8}
.card-item.dragging{opacity:.4;cursor:grabbing}
.card-item.drag-over{border:2px dashed #38bdf8;background:#0c4a6e}
.card-item-body{padding:12px 14px}
.card-item.card-vencido{border-color:#f87171}
/* Bolinha verde = aprendido, cinza = não aprendido */
.c-dot{width:8px;height:8px;border-radius:50%;background:#334155;display:inline-block;margin-right:8px;flex-shrink:0}
.c-dot.yes{background:#16a34a}
.c-front{font-weight:600;color:#f1f5f9;font-size:.88rem;margin-bottom:4px;display:flex;align-items:flex-start}
.c-back{font-size:.78rem;color:#64748b;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.c-thumb{width:100%;max-height:120px;object-fit:cover;border-bottom:1px solid #334155}
.c-link-badge{display:inline-block;font-size:.65rem;background:#0c4a6e;color:#7dd3fc;padding:1px 6px;border-radius:4px;margin-left:4px}
.card-actions{display:flex;gap:4px;padding:8px 12px;border-top:1px solid #1e293b;background:#0f172a}
.c-act{background:none;border:none;color:#475569;cursor:pointer;font-size:.8rem;padding:4px 6px;border-radius:4px;flex:1;text-align:center}
.c-act:hover{color:#38bdf8;background:#1e293b}

/* Estado vazio */
.empty{text-align:center;padding:60px 20px;color:#475569;grid-column:1/-1}
.empty .ico{font-size:3rem;margin-bottom:12px}
.empty p{font-size:.9rem;line-height:1.6}

/* ─────────────────────────────────────
   FAB — botão flutuante de ações
   ───────────────────────────────────── */
.fab-wrap{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;align-items:flex-end;gap:10px;z-index:10}
.fab{width:52px;height:52px;border-radius:50%;background:#0369a1;border:none;color:#fff;font-size:1.5rem;cursor:pointer;box-shadow:0 4px 16px rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;transition:.2s}
.fab:hover{background:#0284c7;transform:scale(1.05)}
.fab-menu{display:none;flex-direction:column;gap:8px;align-items:flex-end}
.fab-menu.open{display:flex}
.fab-option{display:flex;align-items:center;gap:8px;background:#1e293b;border:1px solid #334155;border-radius:20px;padding:8px 14px;cursor:pointer;font-size:.82rem;color:#cbd5e1;white-space:nowrap;transition:.15s}
.fab-option:hover{border-color:#38bdf8;color:#38bdf8}

/* ─────────────────────────────────────
   OVERLAYS E SHEETS — modais de baixo para cima
   ───────────────────────────────────── */
.ov{position:fixed;inset:0;background:rgba(0,0,0,.65);z-index:20;display:none;align-items:flex-end;overflow-y:auto}
.ov.show{display:flex}
.sheet{background:#1e293b;border-radius:20px 20px 0 0;padding:24px;width:100%;border-top:1px solid #334155;max-height:90vh;overflow-y:auto}
.sheet h3{font-size:1rem;font-weight:700;margin-bottom:16px;color:#f1f5f9}
.emoji-inp{width:56px;padding:10px;border-radius:8px;border:1px solid #334155;background:#0f172a;color:#e2e8f0;font-size:1.2rem;text-align:center;outline:none}

/* ─────────────────────────────────────
   SEÇÃO DE IMAGEM no formulário de card
   ───────────────────────────────────── */
.img-section{margin-bottom:12px}
.img-label{font-size:.78rem;color:#64748b;margin-bottom:6px}
.img-preview{width:100%;border-radius:10px;overflow:hidden;background:#0f172a;border:1px solid #334155;margin-bottom:8px;display:none;position:relative}
.img-preview img{width:100%;max-height:180px;object-fit:contain;display:block;background:#0f172a}
.img-remove{position:absolute;top:8px;right:8px;background:rgba(0,0,0,.7);border:none;color:#fff;border-radius:50%;width:28px;height:28px;cursor:pointer;font-size:.8rem}
.paste-area{border:2px dashed #334155;border-radius:10px;padding:16px;text-align:center;color:#475569;font-size:.82rem;cursor:pointer;margin-bottom:8px;outline:none;transition:.2s}
.paste-area:focus{border-color:#38bdf8;color:#38bdf8}
.img-btns{display:flex;gap:8px}
.img-btn{flex:1;padding:9px;border-radius:8px;border:1px solid #334155;background:none;color:#94a3b8;font-size:.82rem;cursor:pointer;text-align:center;transition:.2s}
.img-btn:hover{border-color:#38bdf8;color:#38bdf8}
.uploading{display:none;align-items:center;gap:8px;font-size:.8rem;color:#64748b;margin-bottom:8px}
.uploading.show{display:flex}
.mini-spin{width:16px;height:16px;border:2px solid #334155;border-top-color:#38bdf8;border-radius:50%;animation:spin .8s linear infinite}

/* ─────────────────────────────────────
   TELA DE ESTUDO — cartão girando
   ───────────────────────────────────── */
#s-study{background:#0f172a;position:fixed;inset:0;z-index:50;display:none;flex-direction:column}
#s-study.open{display:flex}
.study-hdr{background:#1e293b;padding:14px 16px;display:flex;align-items:center;gap:12px;border-bottom:1px solid #334155}
.study-back{background:none;border:none;color:#64748b;font-size:1.3rem;cursor:pointer}
.study-back:hover{color:#38bdf8}
.study-wrap{flex:1;display:flex;flex-direction:column;align-items:center;padding:24px;overflow-y:auto}
.spbar-wrap{width:100%;max-width:420px;margin-bottom:20px}
.spbar-info{font-size:.75rem;color:#64748b;margin-bottom:6px;display:flex;justify-content:space-between}
.spbar{height:6px;background:#1e293b;border-radius:3px;overflow:hidden}
.spfill{height:100%;background:linear-gradient(90deg,#0369a1,#38bdf8);border-radius:3px;transition:width .4s}
/* Cartão com efeito de flip 3D */
.fc{width:100%;max-width:420px;perspective:1200px;cursor:pointer}
.fc-inner{width:100%;transition:transform .5s;transform-style:preserve-3d;position:relative;height:55vh}
.fc.flip .fc-inner{transform:rotateY(180deg)}
.fc-f,.fc-b{position:absolute;width:100%;backface-visibility:hidden;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:8px;padding:20px;text-align:center;overflow-y:auto;max-height:55vh}
.fc-f{background:#1e293b;border:1px solid #334155}
.fc-b{background:#0c4a6e;border:1px solid #0369a1;transform:rotateY(180deg)}
.fc-lbl{font-size:.68rem;color:#64748b;text-transform:uppercase;letter-spacing:.05em}
.fc-word{font-size:1.4rem;font-weight:700;color:#f1f5f9;line-height:1.3;width:100%}
.fc-hint{font-size:.72rem;color:#475569;margin-top:4px}
.fc-ans{font-size:1.1rem;color:#7dd3fc;width:100%}
.fc-q{font-size:.85rem;color:#94a3b8;margin-bottom:4px;width:100%}
.fc-img{width:100%;max-height:160px;object-fit:contain;border-radius:12px;margin-bottom:4px;background:#0f172a}
.fc-link{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:8px;background:#0369a1;color:#fff;font-size:.82rem;font-weight:600;text-decoration:none;margin-top:8px}
.fc-link:hover{background:#0284c7}
.study-btns{display:flex;gap:12px;width:100%;max-width:420px;margin-top:auto;padding-top:16px}
.s-btn{flex:1;padding:14px;border-radius:14px;border:none;font-size:.95rem;font-weight:700;cursor:pointer;transition:.2s}
.s-btn.no{background:#7f1d1d;color:#fca5a5}
.s-btn.yes{background:#14532d;color:#86efac}
.revisao-prompt{width:100%;flex:1;display:flex;flex-direction:column;gap:8px}
.revisao-prompt-lbl{font-size:.85rem;color:#94a3b8;text-align:center;margin-bottom:2px}
.revisao-prompt-btns{display:flex;gap:6px}
.revisao-prompt-btns .img-btn{flex:1}
.s-btn:hover{opacity:.85;transform:scale(1.02)}
/* Resumo ao final do estudo */
.summary{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;text-align:center;gap:14px}
.summary .trophy{font-size:4rem}
.summary h2{font-size:1.4rem;font-weight:700;color:#f1f5f9}
.summary p{font-size:.88rem;color:#94a3b8}
.sum-stats{display:flex;gap:28px;margin:8px 0}
.ss{text-align:center}
.ss-n{font-size:2rem;font-weight:700}
.ss-l{font-size:.72rem;color:#64748b;margin-top:2px}
.sum-btns{display:flex;flex-direction:column;gap:10px;width:100%;max-width:320px;margin-top:6px}
.sum-btns .btn-g,.sum-btns .btn-p{width:100%;padding:11px}

/* ─────────────────────────────────────
   LOADING E TOAST
   ───────────────────────────────────── */
#s-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:12px;color:#64748b;font-size:.9rem}
.spin{width:32px;height:32px;border:3px solid #334155;border-top-color:#38bdf8;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.toast{position:fixed;bottom:90px;left:50%;transform:translateX(-50%);background:#1e293b;border:1px solid #334155;padding:10px 20px;border-radius:20px;font-size:.82rem;color:#94a3b8;opacity:0;transition:opacity .3s;pointer-events:none;z-index:100;white-space:nowrap}
.toast.show{opacity:1}

/* ─────────────────────────────────────
   RESPONSIVO MOBILE
   Sidebar some e vira menu hamburguer
   ───────────────────────────────────── */
.mob-menu-btn{display:none;background:none;border:none;color:#94a3b8;font-size:1.4rem;cursor:pointer}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:30}
@media(max-width:768px){
  .sidebar{position:fixed;left:-260px;top:0;height:100vh;z-index:40;transition:left .25s}
  .sidebar.open{left:0}
  .sidebar-overlay.show{display:block}
  .mob-menu-btn{display:block}
}

/* ─────────────────────────────────────
   MARKDOWN — estilos do conteúdo renderizado
   ───────────────────────────────────── */
.md-content{text-align:left;width:100%}
.md-content p{margin-bottom:6px;line-height:1.5}
.md-content p:last-child{margin-bottom:0}
.md-content strong{color:#f1f5f9;font-weight:700}
.md-content em{font-style:italic;color:#94a3b8}
.md-content code{background:#0f172a;padding:2px 6px;border-radius:4px;font-family:monospace;font-size:.85em;color:#7dd3fc;border:1px solid #1e3a5f}
.md-content pre{background:#0f172a;padding:10px 12px;border-radius:8px;overflow-x:auto;margin:8px 0;border:1px solid #334155;text-align:left;white-space:pre-wrap;word-break:break-all}
.md-content pre code{background:none;border:none;padding:0;color:#e2e8f0;font-size:.8em;line-height:1.6}
.md-content h1,.md-content h2,.md-content h3{color:#38bdf8;margin-bottom:6px}
.md-content h1{font-size:1.1rem}.md-content h2{font-size:1rem}.md-content h3{font-size:.9rem}
.md-content ul,.md-content ol{padding-left:18px;margin:6px 0;text-align:left}
.md-content li{margin-bottom:3px;line-height:1.4}
.md-content blockquote{border-left:3px solid #334155;padding-left:10px;color:#64748b;margin:8px 0;font-style:italic}
.md-content table{width:100%;border-collapse:collapse;font-size:.8em;margin:8px 0}
.md-content th{background:#1e3a5f;padding:5px 8px;text-align:left;color:#7dd3fc}
.md-content td{padding:5px 8px;border-bottom:1px solid #1e293b}
.md-content a{color:#38bdf8;text-decoration:underline}