:root{
  --violet:#6d28d9; --violet-d:#4c1d95; --violet-l:#8b5cf6;
  --coral:#fb7185; --coral-d:#f43f5e; --amber:#fbbf24;
  --ink:#1e1b2e; --ink-soft:#4b4763; --bg:#faf9ff; --card:#fff;
  --grad:linear-gradient(135deg,#6d28d9 0%,#8b5cf6 45%,#fb7185 100%);
  --shadow:0 10px 30px rgba(77,29,149,.1);
  --ok:#16a34a; --warn:#d97706; --bad:#dc2626;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
h1,h2,h3,h4{font-family:'Sora',sans-serif;line-height:1.2}
a{color:var(--violet);text-decoration:none}
.hidden{display:none!important}
small{color:var(--ink-soft)}

/* ---------- botões ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:'Sora',sans-serif;font-weight:700;border:none;border-radius:12px;padding:12px 22px;font-size:.93rem;cursor:pointer;transition:.2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(109,40,217,.3)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-soft{background:rgba(109,40,217,.08);color:var(--violet)}
.btn-soft:hover{background:rgba(109,40,217,.15)}
.btn-danger{background:#fee2e2;color:#b91c1c}
.btn-sm{padding:7px 14px;font-size:.82rem;border-radius:10px}
.btn-block{width:100%}

/* ---------- login ---------- */
.auth-screen{min-height:100vh;display:grid;place-items:center;padding:24px;background:
  radial-gradient(700px 400px at 85% 10%,rgba(139,92,246,.18),transparent),
  radial-gradient(600px 400px at 10% 90%,rgba(251,113,133,.14),transparent),var(--bg)}
.auth-card{background:#fff;border-radius:24px;box-shadow:var(--shadow);padding:44px 38px;width:min(430px,100%)}
.auth-logo{font-family:'Sora',sans-serif;font-weight:800;margin-bottom:26px}
.auth-logo span{color:var(--violet)}
.auth-card h1{font-size:1.5rem;margin-bottom:6px}
.auth-sub{color:var(--ink-soft);font-size:.92rem;margin-bottom:22px}
.auth-error{background:#fee2e2;color:#b91c1c;border-radius:12px;padding:11px 16px;font-size:.88rem;margin-bottom:16px}
.field{margin-bottom:16px}
.field label{display:block;font-size:.82rem;font-weight:600;margin-bottom:6px;color:var(--ink-soft)}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1.5px solid #e5e0f5;border-radius:12px;font:inherit;font-size:.93rem;background:#fdfcff;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--violet-l);box-shadow:0 0 0 3px rgba(139,92,246,.15)}
.auth-toggle{text-align:center;margin-top:18px;font-size:.9rem;color:var(--ink-soft)}
.auth-back{display:block;text-align:center;margin-top:14px;font-size:.85rem}

/* ---------- layout ---------- */
.app{display:grid;grid-template-columns:250px 1fr;min-height:100vh}
.sidebar{background:#171528;color:#fff;padding:26px 18px;display:flex;flex-direction:column;gap:20px;position:sticky;top:0;height:100vh}
.side-logo{font-family:'Sora',sans-serif;font-weight:800;font-size:1rem;padding:0 8px}
.side-logo span{color:var(--violet-l)}
.side-user{display:flex;gap:12px;align-items:center;background:rgba(255,255,255,.06);border-radius:14px;padding:12px}
.side-user small{display:block;color:rgba(255,255,255,.55);font-size:.75rem}
.side-user strong{font-size:.88rem}
.avatar{width:38px;height:38px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-weight:800;font-family:'Sora',sans-serif;flex-shrink:0}
.side-nav{display:flex;flex-direction:column;gap:4px;flex:1;overflow-y:auto}
.side-nav a{display:flex;align-items:center;gap:11px;color:rgba(255,255,255,.72);padding:11px 12px;border-radius:12px;font-size:.9rem;font-weight:500;transition:.2s}
.side-nav a:hover{background:rgba(255,255,255,.07);color:#fff}
.side-nav a.active{background:var(--grad);color:#fff;font-weight:700}
.btn-logout{background:rgba(255,255,255,.07);color:rgba(255,255,255,.75);border:none;border-radius:12px;padding:11px;font:inherit;font-size:.87rem;cursor:pointer}
.btn-logout:hover{background:rgba(255,255,255,.14);color:#fff}

.main{display:flex;flex-direction:column;min-width:0}
.topbar{display:flex;align-items:center;gap:18px;padding:18px 30px;background:rgba(250,249,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid rgba(109,40,217,.08);position:sticky;top:0;z-index:20}
.topbar h2{font-size:1.25rem;flex:1}
.hamb{display:none;background:none;border:none;font-size:1.4rem;cursor:pointer}
.student-picker{display:flex;align-items:center;gap:10px;font-size:.85rem;font-weight:600;color:var(--ink-soft)}
.student-picker select{padding:9px 14px;border-radius:11px;border:1.5px solid #e5e0f5;font:inherit;font-size:.88rem;background:#fff}
.content{padding:30px;max-width:1060px;width:100%}
.loading{color:var(--ink-soft);padding:40px;text-align:center}

@media(max-width:860px){
  .app{grid-template-columns:1fr}
  .sidebar{position:fixed;z-index:60;width:260px;transform:translateX(-100%);transition:.3s}
  .sidebar.open{transform:none}
  .hamb{display:block}
  .content{padding:20px 16px}
}

/* ---------- componentes ---------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:760px){.grid-2,.grid-3{grid-template-columns:1fr}}
.card{background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:24px;border:1px solid rgba(109,40,217,.06)}
.card h3{font-size:1.02rem;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px;flex-wrap:wrap}
.card-head h3{margin:0}
.stat{background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:20px 22px}
.stat .big{font-family:'Sora',sans-serif;font-size:1.9rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat small{font-size:.8rem}

.list-item{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:13px 0;border-bottom:1px solid #f1eefb}
.list-item:last-child{border-bottom:0}
.list-item .li-main{min-width:0;flex:1}
.list-item strong{display:block;font-size:.93rem}
.list-item small{font-size:.8rem}
.li-actions{display:flex;gap:8px;flex-shrink:0}

.tag{display:inline-block;font-size:.72rem;font-weight:700;padding:3px 10px;border-radius:999px}
.tag-violet{background:rgba(139,92,246,.12);color:var(--violet)}
.tag-ok{background:#dcfce7;color:#166534}
.tag-warn{background:#fef3c7;color:#92400e}
.tag-bad{background:#fee2e2;color:#b91c1c}
.tag-blue{background:#dbeafe;color:#1e40af}

.bar{height:9px;border-radius:999px;background:#efeafd;overflow:hidden}
.bar i{display:block;height:100%;background:var(--grad);border-radius:999px;transition:width .8s ease}
.bar-row{margin-bottom:14px}
.bar-top{display:flex;justify-content:space-between;font-size:.85rem;font-weight:600;margin-bottom:5px}
.bar-top b{color:var(--violet)}

.empty{color:var(--ink-soft);font-size:.9rem;padding:18px 0;text-align:center}
.section-head{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:20px}
.section-head p{color:var(--ink-soft);font-size:.9rem}

/* tabela */
.table{width:100%;border-collapse:collapse;font-size:.88rem}
.table th{text-align:left;font-size:.74rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);padding:8px 10px;border-bottom:2px solid #efeafd}
.table td{padding:11px 10px;border-bottom:1px solid #f1eefb;vertical-align:middle}
.table tr:last-child td{border-bottom:0}

/* flashcards */
.fc-scene{perspective:1200px;max-width:440px;margin:0 auto;cursor:pointer}
.fcard{position:relative;width:100%;aspect-ratio:16/10;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,.2,.2,1)}
.fcard.flipped{transform:rotateY(180deg)}
.fface{position:absolute;inset:0;backface-visibility:hidden;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:26px;text-align:center;box-shadow:0 14px 34px rgba(77,29,149,.16)}
.fface.front{background:var(--grad);color:#fff}
.fface.front h5{font-family:'Sora',sans-serif;font-size:1.45rem}
.fface.front small{color:rgba(255,255,255,.75)}
.fface.back{transform:rotateY(180deg);background:#fff;border:1px solid rgba(109,40,217,.14)}
.fface.back h5{font-family:'Sora',sans-serif;font-size:1.1rem;color:var(--violet-d)}
.fface.back p{color:var(--ink-soft);font-size:.9rem}
.anki{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.anki button{font-family:'Sora',sans-serif;font-weight:700;font-size:.82rem;padding:10px 20px;border-radius:12px;border:none;cursor:pointer;transition:.15s}
.anki button:hover{transform:scale(1.06)}
.anki .again{background:#fee2e2;color:#b91c1c}
.anki .good{background:#dcfce7;color:#166534}
.anki .easy{background:#dbeafe;color:#1e40af}
.review-meta{text-align:center;color:var(--ink-soft);font-size:.85rem;margin-top:14px}

/* agenda */
.agenda-day{margin-bottom:22px}
.agenda-day h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;color:var(--violet);margin-bottom:8px}
.agenda-item{display:flex;gap:14px;align-items:flex-start;background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:14px 18px;margin-bottom:10px;border-left:4px solid var(--violet)}
.agenda-item.task{border-left-color:var(--amber)}
.agenda-item.done{opacity:.55}
.agenda-item .when{font-family:'Sora',sans-serif;font-weight:700;font-size:.85rem;color:var(--violet);flex-shrink:0;width:52px}
.agenda-item label{display:flex;gap:10px;align-items:center;cursor:pointer;font-size:.92rem}

/* modal */
.modal{position:fixed;inset:0;background:rgba(23,21,40,.55);backdrop-filter:blur(3px);display:grid;place-items:center;z-index:100;padding:20px}
.modal-card{background:#fff;border-radius:20px;width:min(520px,100%);max-height:88vh;overflow-y:auto;padding:28px}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.modal-head h3{font-size:1.1rem}
.modal-head button{background:none;border:none;font-size:1.1rem;cursor:pointer;color:var(--ink-soft)}
.modal .field textarea{min-height:90px;resize:vertical}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}

/* toast */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#171528;color:#fff;padding:13px 24px;border-radius:999px;font-size:.9rem;z-index:200;box-shadow:0 10px 30px rgba(0,0,0,.3);animation:toastIn .3s ease}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,12px)}to{opacity:1;transform:translate(-50%,0)}}

/* home do aluno */
.hello-card{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}

/* materiais em grade */
.mat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.mat-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);border:1px solid rgba(109,40,217,.06);display:flex;flex-direction:column}
.mat-thumb{height:132px;background:#f3f0fc;display:grid;place-items:center;overflow:hidden}
.mat-thumb img{width:100%;height:100%;object-fit:cover}
.thumb-ic{font-size:2.3rem;display:flex;flex-direction:column;align-items:center;gap:2px}
.thumb-ic small{font-size:.7rem;font-weight:700;color:var(--ink-soft)}
.thumb-site{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:.76rem;color:var(--ink-soft)}
.thumb-site img{width:34px;height:34px}
.mat-body{padding:12px 16px;flex:1}
.mat-body strong{font-size:.92rem;display:block}
.mat-body small{font-size:.8rem}
.mat-actions{display:flex;gap:8px;padding:0 16px 14px;flex-wrap:wrap}

/* texto clicável + quiz */
.read-box{background:#f6f4fe;border-radius:14px;padding:16px 18px;line-height:2;margin-bottom:8px;font-size:.95rem}
.w{cursor:pointer;border-radius:5px;padding:0 2px;transition:.15s}
.w:hover{background:#e9d5ff}
.hint{font-size:.8rem;color:var(--ink-soft);margin-bottom:12px}
#word-panel{background:#fff7ed;border:1px solid #fed7aa;border-radius:12px;padding:14px;margin-bottom:14px}
.q-block{background:#fbfaff;border:1px solid #efeafd;border-radius:14px;padding:14px 16px;margin-bottom:12px}
.q-block b{display:block;margin-bottom:8px;font-size:.92rem}
.q-block textarea{width:100%;min-height:70px;padding:10px 12px;border:1.5px solid #e5e0f5;border-radius:10px;font:inherit;font-size:.9rem}
.opt{display:flex;gap:9px;align-items:center;padding:8px 10px;border-radius:10px;cursor:pointer;font-size:.9rem}
.opt:hover{background:#f1ecfd}
.opt.right{background:#dcfce7}
.opt.wrong{background:#fee2e2}
.q-item{background:#fbfaff;border:1px solid #efeafd;border-radius:12px;padding:12px;margin-bottom:10px}
.result-banner{background:var(--grad);color:#fff;border-radius:14px;padding:14px 20px;text-align:center;font-family:'Sora',sans-serif;font-weight:700;margin-bottom:14px}

/* questões de ligar colunas */
.pair{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:6px 0;border-radius:10px}
.pair span{font-size:.9rem;font-weight:600}
.pair select{padding:9px 12px;border-radius:10px;border:1.5px solid #e5e0f5;font:inherit;font-size:.88rem;background:#fff;max-width:60%}
.pair.right{background:#dcfce7;padding:6px 10px}
.pair.wrong{background:#fee2e2;padding:6px 10px}

/* aula ao vivo */
.btn-live{animation:livePulse 1.8s infinite}
@keyframes livePulse{0%{box-shadow:0 0 0 0 rgba(109,40,217,.45)}70%{box-shadow:0 0 0 12px rgba(109,40,217,0)}100%{box-shadow:0 0 0 0 rgba(109,40,217,0)}}
.btn-locked{opacity:.75;cursor:default}
.req-panel{border-left:5px solid var(--amber)}

/* imagem de questão */
.q-img-preview{max-width:100%;max-height:240px;border-radius:12px;margin-top:8px;object-fit:contain;display:block}

/* exemplo de formato DOCX */
.docx-ex{background:#171528;color:#d8d3ee;border-radius:12px;padding:14px 18px;font-size:.82rem;line-height:1.7;overflow-x:auto;white-space:pre}

/* flashcard com imagem */
.fc-img{max-height:96px;max-width:80%;border-radius:10px;object-fit:cover;margin-bottom:4px}
.fcard{min-height:230px}
.fface{min-height:230px}
.fc-cue{font-size:.86rem;color:rgba(255,255,255,.85);font-weight:600}
.fc-try{width:85%;padding:10px 14px;border:none;border-radius:11px;background:rgba(255,255,255,.92);font:inherit;font-size:.9rem;text-align:center;margin:4px 0}
.fc-try:focus{outline:3px solid rgba(255,255,255,.45)}

/* palavra chips */
.words-grid{display:flex;flex-wrap:wrap;gap:10px}
.word-chip{background:#fff;border:1.5px solid #e5e0f5;border-radius:14px;padding:10px 16px;font-size:.88rem;box-shadow:0 4px 12px rgba(77,29,149,.05)}
.word-chip b{color:var(--violet-d)}
.word-chip small{display:block;font-size:.78rem}
.word-chip button{background:none;border:none;color:#c4b8e8;cursor:pointer;margin-left:8px;font-size:.8rem}
.word-chip button:hover{color:var(--bad)}