@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700&display=swap');

:root{
    --teal:#0d9488; --teal-dark:#0f766e; --red:#dc2626; --red-dark:#b91c1c;
    --ink:#1e293b; --muted:#64748b; --line:#e2e8f0; --bg:#f8fafc;
}
*{box-sizing:border-box;}
body{margin:0;font-family:'Inter',sans-serif;background:var(--bg);color:var(--ink);padding-top:4px;}
h1,h2,h3,.brand,.btn,.tab,.sidebar-link{font-family:'DM Sans',sans-serif;}

.rainbow-bar{position:fixed;top:0;left:0;right:0;height:4px;z-index:9999;
    background:linear-gradient(to right,#06b6d4,#3b82f6,#a855f7,#f97316,#eab308);}

.navbar{background:#fff;position:sticky;top:0;z-index:50;box-shadow:0 1px 2px rgba(0,0,0,.05);}
.navbar-inner{max-width:1100px;margin:0 auto;padding:.8rem 1.5rem;display:flex;justify-content:space-between;align-items:center;}
.brand{font-weight:700;color:var(--teal-dark);font-size:1.15rem;text-decoration:none;}
.brand span{color:var(--red);}
.nav-links{display:flex;align-items:center;gap:.9rem;}
.nav-links a{color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:500;}
.nav-links a:hover{color:var(--teal);}

.container{max-width:1100px;margin:0 auto;padding:2rem 1.5rem;}
.card{background:#fff;border:1px solid var(--line);border-radius:.75rem;padding:1.5rem;margin-bottom:1.5rem;}
.card h2{margin-top:0;font-size:1.1rem;color:var(--red);}
.card h3{font-size:1rem;color:var(--ink);}

.btn{display:inline-block;border:none;border-radius:.5rem;padding:.6rem 1.2rem;font-weight:600;font-size:.85rem;cursor:pointer;text-decoration:none;transition:.15s;}
.btn-primary{background:var(--teal);color:#fff;}
.btn-primary:hover{background:var(--teal-dark);}
.btn-danger{background:var(--red);color:#fff;}
.btn-danger:hover{background:var(--red-dark);}
.btn-outline{background:#fff;color:var(--teal);border:1.5px solid var(--teal);}
.btn-outline:hover{background:#f0fdfa;}
.btn-sm{padding:.35rem .75rem;font-size:.78rem;}
.btn[disabled]{opacity:.5;cursor:not-allowed;}

label{display:block;font-size:.82rem;font-weight:600;color:var(--ink);margin:.7rem 0 .3rem;}
input[type=text],input[type=email],input[type=password],textarea,select{
    width:100%;padding:.65rem .8rem;border:1.5px solid var(--line);border-radius:.5rem;font-size:.9rem;font-family:inherit;
}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--teal);}
textarea{resize:vertical;min-height:80px;}
.field-error{color:var(--red);font-size:.78rem;margin-top:.2rem;display:none;}
.help-text{color:var(--muted);font-size:.78rem;margin-top:.3rem;}

.form-narrow{max-width:420px;margin:2rem auto;}

table{width:100%;border-collapse:collapse;font-size:.85rem;}
th,td{text-align:left;padding:.65rem .6rem;border-bottom:1px solid var(--line);}
th{color:var(--muted);font-weight:700;font-size:.75rem;text-transform:uppercase;letter-spacing:.03em;}
tr:hover td{background:#f8fafc;}

.badge{display:inline-block;padding:.15rem .6rem;border-radius:999px;font-size:.72rem;font-weight:700;}
.badge-pending{background:#fef9c3;color:#92400e;}
.badge-graded{background:#dcfce7;color:#166534;}
.badge-released{background:#dbeafe;color:#1e40af;}

.alert{padding:.8rem 1rem;border-radius:.5rem;font-size:.85rem;margin-bottom:1.2rem;}
.alert-success{background:#dcfce7;color:#166534;border:1px solid #bbf7d0;}
.alert-error{background:#fee2e2;color:#991b1b;border:1px solid #fecaca;}

.tabs{display:flex;gap:.4rem;border-bottom:1px solid var(--line);margin-bottom:1.5rem;flex-wrap:wrap;}
.tab{padding:.6rem 1rem;font-size:.85rem;font-weight:600;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent;}
.tab.active{color:var(--teal);border-color:var(--teal);}

.page-title{margin-bottom:1.5rem;}
.page-title h1{font-size:1.6rem;margin-bottom:.2rem;}
.page-title p{color:var(--muted);font-size:.9rem;margin:0;}

.quiz-q{display:none;}
.quiz-q.active{display:block;}
.option-row{display:flex;align-items:center;gap:.6rem;padding:.6rem .8rem;border:1.5px solid var(--line);border-radius:.5rem;margin-bottom:.5rem;cursor:pointer;}
.option-row:hover{border-color:var(--teal);}
.option-row input{width:auto;}
.q-nav{display:flex;justify-content:space-between;margin-top:1.5rem;}
.q-progress{display:flex;flex-wrap:wrap;gap:.3rem;margin-bottom:1.2rem;}
.q-dot{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;
    background:#f1f5f9;color:var(--muted);cursor:pointer;border:1.5px solid transparent;}
.q-dot.answered{background:#ccfbf1;color:var(--teal-dark);}
.q-dot.current{border-color:var(--red);}

.empty-state{text-align:center;color:var(--muted);padding:2.5rem 1rem;font-size:.9rem;}
.file-list a{color:var(--teal);text-decoration:none;font-size:.85rem;}
.file-list li{margin-bottom:.3rem;}

@media(max-width:640px){ .navbar-inner{flex-direction:column;gap:.5rem;align-items:flex-start;} }