/* ===== QU STAT 341 — shared styles ===== */
:root{
  --maroon:#7A1728;
  --maroon-dark:#5E1120;
  --maroon-light:#9B2A3D;
  --gold:#C9952A;
  --gold-light:#E0B65A;
  --ink:#1d1a1b;
  --muted:#6b6266;
  --line:#e7e0e2;
  --bg:#faf7f8;
  --card:#ffffff;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 8px 24px rgba(122,23,40,.06);
  --radius:14px;
  --maxw:1140px;
  --serif:"Georgia","Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--maroon);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.2;color:var(--maroon-dark);margin:.2em 0 .5em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* Header / nav */
.topbar{background:var(--maroon);color:#fff;font-size:.82rem}
.topbar .container{display:flex;justify-content:space-between;align-items:center;padding:6px 20px;flex-wrap:wrap;gap:6px}
.topbar a{color:var(--gold-light)}
header.site{background:linear-gradient(180deg,var(--maroon),var(--maroon-dark));color:#fff;border-bottom:4px solid var(--gold)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:var(--maxw);margin:0 auto;gap:14px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none}
.brand .logo{width:42px;height:42px;border-radius:9px;background:#fff;display:grid;place-items:center;color:var(--maroon);font-family:var(--serif);font-weight:700;font-size:.95rem;flex-shrink:0;box-shadow:0 2px 6px rgba(0,0,0,.2)}
.brand b{display:block;font-family:var(--serif);font-size:1.05rem;letter-spacing:.3px}
.brand span{display:block;font-size:.74rem;color:var(--gold-light);letter-spacing:.5px}
.navlinks{display:flex;gap:4px;align-items:center;flex-wrap:wrap}
.navlinks a{color:#f3e8d8;padding:8px 13px;border-radius:8px;font-size:.9rem;font-weight:500}
.navlinks a:hover{background:rgba(255,255,255,.12);text-decoration:none}
.navlinks a.active{background:var(--gold);color:var(--maroon-dark);font-weight:600}
.navlinks a.btn-login{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3)}
.burger{display:none;background:none;border:0;color:#fff;font-size:1.5rem;cursor:pointer}

@media(max-width:860px){
  .burger{display:block}
  .navlinks{display:none;width:100%;flex-direction:column;align-items:stretch;padding:8px 0}
  .navlinks.open{display:flex}
  .nav{flex-wrap:wrap}
}

/* Hero */
.hero{background:linear-gradient(135deg,var(--maroon) 0%,var(--maroon-dark) 70%);color:#fff;padding:54px 0 60px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(201,149,42,.25),transparent 70%)}
.hero .eyebrow{color:var(--gold-light);font-weight:600;letter-spacing:2px;text-transform:uppercase;font-size:.78rem;margin-bottom:10px}
.hero h1{color:#fff;font-size:2.5rem;margin:0 0 8px}
.hero p.sub{font-size:1.15rem;color:#f0e3d2;font-style:italic;margin:0 0 18px;max-width:640px}
.hero .meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.pill{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:30px;font-size:.85rem;color:#fff}

/* Sections & cards */
section.block{padding:46px 0}
.section-title{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.section-title:before{content:"";width:30px;height:4px;background:var(--gold);border-radius:3px}
.lead{color:var(--muted);max-width:760px;margin:0 0 26px}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s}
.card.hover:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(122,23,40,.13)}
.card h3{margin-top:0}
.tag{display:inline-block;background:var(--gold);color:var(--maroon-dark);font-size:.72rem;font-weight:700;padding:3px 10px;border-radius:20px;letter-spacing:.4px;text-transform:uppercase}
.tag.soft{background:#f3e7cf;color:#7a5a10}

/* Info rows */
.kv{display:flex;gap:10px;padding:9px 0;border-bottom:1px dashed var(--line)}
.kv:last-child{border-bottom:0}
.kv .k{min-width:130px;color:var(--muted);font-size:.9rem}
.kv .v{font-weight:600}

/* Grade bars */
.gradebar{margin:12px 0}
.gradebar .row{display:flex;justify-content:space-between;font-size:.9rem;margin-bottom:5px}
.gradebar .track{height:11px;background:#f0e9eb;border-radius:8px;overflow:hidden}
.gradebar .fill{height:100%;background:linear-gradient(90deg,var(--maroon),var(--gold));border-radius:8px}

/* Tables */
table.tbl{width:100%;border-collapse:collapse;background:#fff;border-radius:10px;overflow:hidden;box-shadow:var(--shadow)}
table.tbl th{background:var(--maroon);color:#fff;text-align:left;padding:11px 14px;font-size:.85rem;font-weight:600}
table.tbl td{padding:10px 14px;border-bottom:1px solid var(--line);font-size:.92rem}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tr:nth-child(even) td{background:#faf6f7}
.badge-note{background:var(--gold);color:var(--maroon-dark);font-size:.74rem;font-weight:700;padding:2px 8px;border-radius:6px}

/* Buttons */
.btn{display:inline-block;background:var(--maroon);color:#fff;padding:11px 20px;border-radius:9px;font-weight:600;border:0;cursor:pointer;font-size:.95rem;transition:background .15s}
.btn:hover{background:var(--maroon-light);text-decoration:none}
.btn.gold{background:var(--gold);color:var(--maroon-dark)}
.btn.gold:hover{background:var(--gold-light)}
.btn.ghost{background:transparent;border:1.5px solid var(--maroon);color:var(--maroon)}
.btn.ghost:hover{background:var(--maroon);color:#fff}
.btn.sm{padding:7px 14px;font-size:.85rem}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* Footer */
footer.site{background:var(--maroon-dark);color:#e7d9c4;margin-top:40px;padding:30px 0;font-size:.9rem}
footer.site a{color:var(--gold-light)}
footer.site .container{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

/* Forms */
.field{margin-bottom:15px}
.field label{display:block;font-size:.86rem;font-weight:600;margin-bottom:6px;color:var(--ink)}
.field input,.field select{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:9px;font-size:.96rem;font-family:inherit}
.field input:focus,.field select:focus{outline:0;border-color:var(--maroon)}
.auth-wrap{max-width:430px;margin:50px auto;padding:0 20px}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow)}
.note{background:#fbf3df;border:1px solid #ecd9a8;color:#7a5a10;padding:11px 14px;border-radius:9px;font-size:.86rem;margin:12px 0}
.msg{padding:11px 14px;border-radius:9px;font-size:.9rem;margin:12px 0;display:none}
.msg.show{display:block}
.msg.ok{background:#e6f6ec;border:1px solid #b7e3c5;color:#1c6b39}
.msg.err{background:#fbe9e9;border:1px solid #efc0c0;color:#9b2226}
.tabs{display:flex;gap:8px;margin-bottom:20px}
.tabs button{flex:1;padding:10px;border:1.5px solid var(--line);background:#fff;border-radius:9px;cursor:pointer;font-weight:600;color:var(--muted)}
.tabs button.active{background:var(--maroon);color:#fff;border-color:var(--maroon)}

/* Study lab */
.lab-layout{display:grid;grid-template-columns:240px 1fr;gap:24px;align-items:start}
@media(max-width:820px){.lab-layout{grid-template-columns:1fr}}
.chlist{position:sticky;top:14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow)}
.chlist a{display:block;padding:9px 12px;border-radius:8px;color:var(--ink);font-size:.9rem;font-weight:500}
.chlist a:hover{background:#f6eef0;text-decoration:none}
.chlist a.active{background:var(--maroon);color:#fff}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
.toolbar button{padding:9px 16px;border:1.5px solid var(--line);background:#fff;border-radius:9px;cursor:pointer;font-weight:600;font-size:.88rem;color:var(--muted)}
.toolbar button.active{background:var(--gold);color:var(--maroon-dark);border-color:var(--gold)}
.panel{display:none}
.panel.active{display:block;animation:fade .25s}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1}}

.formula{background:#fbf8f3;border-left:4px solid var(--gold);padding:12px 16px;border-radius:0 9px 9px 0;margin:10px 0}
.formula .fn{font-size:.82rem;color:var(--muted);font-weight:600;margin-bottom:3px}
.formula .ff{font-family:"Cambria Math","Georgia",serif;font-size:1.08rem;color:var(--maroon-dark)}

/* Flashcard */
.flash{perspective:1200px;height:200px;margin:14px 0}
.flash-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d;cursor:pointer}
.flash.flipped .flash-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:14px;padding:24px;display:grid;place-items:center;text-align:center;box-shadow:var(--shadow)}
.flash-front{background:linear-gradient(135deg,var(--maroon),var(--maroon-dark));color:#fff}
.flash-back{background:#fff;border:2px solid var(--gold);transform:rotateY(180deg);color:var(--ink)}
.flash-face .lbl{position:absolute;top:12px;left:16px;font-size:.7rem;letter-spacing:1px;text-transform:uppercase;opacity:.7}
.flash-nav{display:flex;justify-content:space-between;align-items:center;gap:10px}

/* Chat / tutor */
.chat{display:flex;flex-direction:column;height:480px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden;box-shadow:var(--shadow)}
.chat-head{background:var(--maroon);color:#fff;padding:13px 16px;font-weight:600;display:flex;align-items:center;gap:9px}
.chat-head .dot{width:9px;height:9px;border-radius:50%;background:#4ade80}
.chat-body{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;background:#faf7f8}
.bubble{max-width:84%;padding:11px 15px;border-radius:14px;font-size:.92rem;line-height:1.5;white-space:pre-wrap}
.bubble.user{align-self:flex-end;background:var(--maroon);color:#fff;border-bottom-right-radius:4px}
.bubble.bot{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px}
.bubble.bot.typing{color:var(--muted);font-style:italic}
.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);background:#fff}
.chat-input input{flex:1;padding:11px 14px;border:1.5px solid var(--line);border-radius:24px;font-size:.93rem;font-family:inherit}
.chat-input input:focus{outline:0;border-color:var(--maroon)}
.suggest{display:flex;gap:7px;flex-wrap:wrap;padding:0 12px 12px;background:#fff}
.suggest button{font-size:.78rem;padding:6px 11px;border:1px solid var(--line);background:#faf6f7;border-radius:18px;cursor:pointer;color:var(--maroon)}
.suggest button:hover{background:var(--maroon);color:#fff;border-color:var(--maroon)}

/* PDF viewer */
.pdfview{width:100%;height:560px;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}

/* Dashboard */
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.stat .num{font-size:2.1rem;font-weight:800;color:var(--maroon);font-family:var(--serif)}
.stat .lab{color:var(--muted);font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.gate{max-width:460px;margin:60px auto;text-align:center}
.hidden{display:none!important}

/* Auth gate: hide protected page content until the login check resolves */
html.auth-checking body{visibility:hidden}
html.auth-checking::before{content:"";position:fixed;inset:0;background:var(--bg);z-index:9999}
html.auth-checking::after{content:"";position:fixed;top:50%;left:50%;width:38px;height:38px;margin:-19px 0 0 -19px;border:4px solid var(--line);border-top-color:var(--maroon);border-radius:50%;z-index:10000;animation:authspin .8s linear infinite}
@keyframes authspin{to{transform:rotate(360deg)}}