/* ============================================================
   Topper's PrepHub — styles
   ============================================================ */
:root{
  --navy:#14213D; --navy2:#1d2b4d; --gold:#FCA311; --teal:#2A9D8F;
  --ink:#1d2939; --muted:#667085; --line:#e7eaf0; --bg:#f5f7fb;
  --ok:#22a06b; --bad:#e5484d; --card:#ffffff; --radius:16px;
  --shadow:0 6px 24px rgba(20,33,61,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;
  background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
a{color:inherit}
button{font-family:inherit}

/* ---------- boot ---------- */
.boot{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:var(--navy);color:#fff}
.boot-logo{font-size:54px}
.boot-title{font-size:22px;font-weight:800;letter-spacing:.3px}
.spinner{width:34px;height:34px;border:3px solid rgba(255,255,255,.25);border-top-color:var(--gold);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- auth screens ---------- */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:22px;
  background:radial-gradient(1200px 600px at 20% -10%,#22345c 0,var(--navy) 55%)}
.auth-card{background:#fff;border-radius:22px;box-shadow:0 20px 60px rgba(0,0,0,.3);width:100%;max-width:440px;padding:30px 28px}
.auth-logo{font-size:40px;text-align:center}
.auth-card h1{font-size:24px;margin:6px 0 2px;text-align:center;color:var(--navy)}
.auth-card .sub{color:var(--muted);text-align:center;font-size:14px;margin:0 0 20px}
.field{margin-bottom:12px}
.field label{display:block;font-size:12.5px;font-weight:600;color:#475569;margin-bottom:5px}
.field input,.field select,.field textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:11px;font-size:14.5px;background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(42,157,143,.15)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:12px;
  padding:12px 18px;font-weight:700;font-size:14.5px;cursor:pointer;transition:.15s;text-decoration:none}
.btn-primary{background:var(--navy);color:#fff;width:100%}
.btn-primary:hover{background:#0e1830}
.btn-gold{background:var(--gold);color:#3a2600}
.btn-gold:hover{filter:brightness(.96)}
.btn-teal{background:var(--teal);color:#fff}
.btn-ghost{background:#eef1f6;color:var(--navy)}
.btn-ghost:hover{background:#e2e7ef}
.btn-sm{padding:8px 13px;font-size:13px;border-radius:10px}
.btn-block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.switch-line{text-align:center;font-size:13.5px;color:var(--muted);margin-top:16px}
.switch-line a{color:var(--teal);font-weight:700;cursor:pointer;text-decoration:none}
.err{background:#fdecec;color:#b42318;border:1px solid #f7c9c9;border-radius:10px;padding:9px 12px;font-size:13px;margin-bottom:12px}
.ok{background:#e9f7ef;color:#0d7a45;border:1px solid #bfe6cf;border-radius:10px;padding:9px 12px;font-size:13px;margin-bottom:12px}

/* ---------- status screens ---------- */
.status-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:22px;background:var(--navy)}
.status-card{background:#fff;border-radius:22px;max-width:480px;padding:34px 30px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.status-emoji{font-size:52px}
.status-card h2{color:var(--navy);margin:8px 0 6px}
.status-card p{color:var(--muted);font-size:14.5px;line-height:1.6}

/* ---------- app layout ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:236px;background:var(--navy);color:#cdd6ea;display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;z-index:40}
.sb-brand{display:flex;align-items:center;gap:10px;padding:18px 18px 14px;color:#fff;font-weight:800;font-size:17px;border-bottom:1px solid rgba(255,255,255,.08)}
.sb-brand .logo{font-size:22px}
.sb-nav{flex:1;overflow-y:auto;padding:10px 10px 20px}
.sb-link{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:10px;cursor:pointer;font-size:14px;font-weight:600;color:#c3cde3;margin-bottom:2px}
.sb-link .ic{width:20px;text-align:center}
.sb-link:hover{background:rgba(255,255,255,.07);color:#fff}
.sb-link.active{background:var(--gold);color:#3a2600}
.sb-foot{padding:12px;border-top:1px solid rgba(255,255,255,.08);font-size:12px;color:#8b97b5}
.sb-section{font-size:10.5px;letter-spacing:.8px;text-transform:uppercase;color:#7c88a8;margin:12px 10px 4px;font-weight:800}

.main{flex:1;margin-left:236px;min-height:100vh;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.topbar .pagetitle{font-size:18px;font-weight:800;color:var(--navy)}
.topbar .right{display:flex;align-items:center;gap:14px}
.chip-xp{background:#fff4e0;color:#8a5a00;border:1px solid #f6d79a;border-radius:20px;padding:5px 12px;font-weight:700;font-size:13px}
.chip-streak{background:#e9f7ef;color:#0d7a45;border:1px solid #bfe6cf;border-radius:20px;padding:5px 12px;font-weight:700;font-size:13px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--teal);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;cursor:pointer}
.content{padding:24px;max-width:1160px;width:100%;margin:0 auto}

.hamburger{display:none;background:none;border:none;font-size:22px;cursor:pointer;color:var(--navy)}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g-auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.card h3{margin:0 0 6px;color:var(--navy);font-size:16px}
.card .muted{color:var(--muted);font-size:13.5px}
.stat{display:flex;flex-direction:column;gap:2px}
.stat .num{font-size:30px;font-weight:800;color:var(--navy);line-height:1}
.stat .lab{color:var(--muted);font-size:13px}
.section-title{font-size:19px;font-weight:800;color:var(--navy);margin:6px 0 14px;display:flex;align-items:center;gap:9px}
.section-title .bar{width:6px;height:20px;background:var(--gold);border-radius:3px}
.pill{display:inline-block;background:#eef1f6;color:#475569;border-radius:20px;padding:3px 10px;font-size:12px;font-weight:600}
.pill.gold{background:#fff4e0;color:#8a5a00}
.pill.teal{background:#e6f5f2;color:#116b60}
.pill.hard{background:#fdecec;color:#b42318}
.row{display:flex;align-items:center;gap:10px}
.between{justify-content:space-between}
.wrap{flex-wrap:wrap}
.spacer{flex:1}
hr.soft{border:none;border-top:1px solid var(--line);margin:16px 0}

/* subject / quiz tiles */
.tile{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;cursor:pointer;transition:.15s;box-shadow:var(--shadow)}
.tile:hover{transform:translateY(-2px);border-color:var(--teal)}
.tile .ic{font-size:26px}
.tile h4{margin:8px 0 3px;color:var(--navy);font-size:15px}
.tile .muted{color:var(--muted);font-size:12.5px}

/* quiz runner */
.q-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.timer{font-weight:800;color:var(--navy);background:#fff4e0;border:1px solid #f6d79a;border-radius:10px;padding:6px 12px}
.progressbar{height:8px;background:#eceff4;border-radius:20px;overflow:hidden;margin-bottom:18px}
.progressbar > div{height:100%;background:var(--teal);transition:width .3s}
.opt{display:block;width:100%;text-align:left;border:1.5px solid var(--line);background:#fff;border-radius:12px;padding:13px 15px;margin-bottom:10px;cursor:pointer;font-size:14.5px;transition:.12s}
.opt:hover{border-color:var(--teal);background:#f6fffd}
.opt.sel{border-color:var(--teal);background:#e9f7f4}
.opt.correct{border-color:var(--ok);background:#e9f7ef}
.opt.wrong{border-color:var(--bad);background:#fdecec}
.expl{background:#f6f8fc;border-left:3px solid var(--teal);border-radius:8px;padding:10px 13px;font-size:13.5px;color:#334155;margin:6px 0 14px}

/* tables */
table.tbl{width:100%;border-collapse:collapse;font-size:14px}
table.tbl th,table.tbl td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
table.tbl th{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.4px}
table.tbl tr:hover td{background:#fafbfe}

/* leaderboard */
.lb-rank{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;background:#eef1f6;color:#475569}
.lb-rank.g1{background:#ffe9b0;color:#8a5a00}
.lb-rank.g2{background:#e6e9ef;color:#475569}
.lb-rank.g3{background:#f6ddc6;color:#8a4b17}

/* AI tutor */
.chatbox{display:flex;flex-direction:column;height:calc(100vh - 190px);min-height:420px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.chat-msgs{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:12px}
.msg{max-width:80%;padding:11px 14px;border-radius:14px;font-size:14.5px;line-height:1.55;white-space:pre-wrap}
.msg.user{align-self:flex-end;background:var(--navy);color:#fff;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:#f1f4f9;color:#1d2939;border-bottom-left-radius:4px}
.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line)}
.chat-input input{flex:1;padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-size:14.5px}
.tool-row{display:flex;flex-wrap:wrap;gap:7px;padding:10px 12px 0}
.tool-btn{background:#fff;color:var(--navy);border:1px solid var(--teal);border-radius:20px;padding:6px 12px;font-size:12.5px;font-weight:600;cursor:pointer}
.tool-btn:hover{background:var(--teal);color:#fff}

/* toast + modal */
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:var(--navy);color:#fff;padding:12px 18px;border-radius:12px;font-size:14px;box-shadow:0 10px 30px rgba(0,0,0,.3);z-index:100;opacity:0;transition:.25s}
.toast.show{opacity:1;bottom:32px}
.modal-bg{position:fixed;inset:0;background:rgba(15,23,42,.55);display:flex;align-items:center;justify-content:center;z-index:90;padding:18px}
.modal{background:#fff;border-radius:18px;max-width:560px;width:100%;max-height:90vh;overflow-y:auto;padding:24px}
.modal h3{margin:0 0 12px;color:var(--navy)}
.close-x{float:right;background:none;border:none;font-size:22px;cursor:pointer;color:#94a3b8}

.empty{text-align:center;color:var(--muted);padding:40px 10px}
.empty .e{font-size:40px}
.badge-chip{display:inline-flex;align-items:center;gap:6px;background:#fff4e0;color:#8a5a00;border:1px solid #f6d79a;border-radius:20px;padding:5px 12px;font-size:12.5px;font-weight:700;margin:0 6px 6px 0}

/* responsive */
@media(max-width:900px){
  .g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:1fr}.g2{grid-template-columns:1fr}
  .sidebar{transform:translateX(-100%);transition:.25s;width:230px}
  .sidebar.open{transform:none;box-shadow:0 0 40px rgba(0,0,0,.4)}
  .main{margin-left:0}
  .hamburger{display:block}
  .content{padding:16px}
}
@media(max-width:520px){
  .g4{grid-template-columns:1fr}
  .chip-xp,.chip-streak{display:none}
  .msg{max-width:92%}
}