:root{
    --eva-primary:#1d4ed8;
    --eva-primary-2:#0ea5e9;
    --eva-accent:#22d3ee;
    --eva-dark:#0f172a;
    --eva-text:#0b1120;
    --eva-muted:#475569;
    --eva-border:rgba(148,163,184,.38);
    --eva-glass:rgba(255,255,255,.78);
    --eva-glass-strong:rgba(255,255,255,.92);
    --eva-sidebar:rgba(255,255,255,.70);
    --eva-shadow:0 18px 45px rgba(15,23,42,.16);
    --eva-soft-shadow:0 10px 28px rgba(15,23,42,.10);
}

html,body{min-height:100%;}
body{
    font-family:Arial, Helvetica, sans-serif;
    color:var(--eva-text);
    background:
        radial-gradient(circle at 8% 0%, rgba(14,165,233,.30), transparent 24%),
        radial-gradient(circle at 100% 12%, rgba(29,78,216,.24), transparent 28%),
        linear-gradient(145deg,#eaf3ff 0%,#f8fbff 42%,#e7f0fb 100%);
    background-attachment:fixed;
    letter-spacing:.01em;
}

a{color:#075bd8;font-weight:500;}
a:hover{color:#0f4db4;}

.eva-navbar{
    position:sticky;
    top:0;
    z-index:1030;
    min-height:58px;
    background:linear-gradient(135deg,rgba(29,78,216,.94),rgba(14,165,233,.92));
    backdrop-filter:blur(18px) saturate(150%);
    -webkit-backdrop-filter:blur(18px) saturate(150%);
    border-bottom:1px solid rgba(255,255,255,.34);
    box-shadow:0 10px 24px rgba(15,23,42,.18);
}
.eva-brand{display:flex;align-items:center;gap:8px;}
.eva-brand-icon{width:34px;height:34px;border-radius:12px;object-fit:cover;background:rgba(255,255,255,.92);padding:2px;box-shadow:0 8px 16px rgba(15,23,42,.18);}
.eva-title-system{font-weight:600;text-shadow:0 2px 6px rgba(15,23,42,.25);}
.eva-user-name{font-weight:700;text-shadow:0 2px 6px rgba(15,23,42,.25);}
.eva-logout-btn{border-radius:12px;font-weight:700;box-shadow:0 8px 16px rgba(15,23,42,.15);}
.eva-institution-badge{
    display:inline-flex;
    align-items:center;
    gap:8px;
    background:rgba(255,255,255,.16);
    border:1px solid rgba(255,255,255,.42);
    border-radius:16px;
    padding:7px 12px;
    color:#fff;
    box-shadow:inset 0 1px 1px rgba(255,255,255,.35), 0 10px 22px rgba(15,23,42,.12);
}
.eva-institution-logo{height:28px;max-width:90px;object-fit:contain;background:rgba(255,255,255,.95);border-radius:8px;padding:2px;}
.eva-institution-name{font-weight:700;}
.eva-institution-fallback{font-size:20px;}

.eva-shell{padding-left:0;padding-right:0;}
.eva-sidebar{
    min-height:calc(100vh - 58px);
    background:var(--eva-sidebar);
    backdrop-filter:blur(22px) saturate(160%);
    -webkit-backdrop-filter:blur(22px) saturate(160%);
    border-right:1px solid rgba(148,163,184,.30);
    box-shadow:12px 0 34px rgba(15,23,42,.08);
    position:sticky;
    top:58px;
    align-self:flex-start;
    max-height:calc(100vh - 58px);
    overflow-y:auto;
}
.eva-sidebar hr{border-color:rgba(100,116,139,.28);}
.eva-sidebar a{
    display:block;
    padding:11px 16px;
    color:#10233f;
    text-decoration:none;
    border-radius:16px;
    margin:5px 12px;
    border-left:4px solid transparent;
    font-weight:600;
    transition:all .18s ease;
}
.eva-sidebar a:hover{
    background:rgba(255,255,255,.74);
    color:#0b57c8;
    transform:translateX(2px);
    box-shadow:0 10px 22px rgba(15,23,42,.08);
}
.eva-sidebar a.active{
    background:linear-gradient(135deg,rgba(255,255,255,.86),rgba(219,234,254,.88));
    color:#0b4fc2;
    font-weight:800;
    border-left-color:#2563eb;
    box-shadow:0 12px 24px rgba(37,99,235,.18), inset 0 1px 0 rgba(255,255,255,.72);
}

.eva-main{padding-left:22px!important;padding-right:22px!important;}
.eva-card,.card-eva,.login-box,.preview-contenedor > table,.grid-view,.detail-view{
    background:var(--eva-glass-strong)!important;
    border:1px solid rgba(255,255,255,.72)!important;
    border-radius:22px!important;
    box-shadow:var(--eva-shadow)!important;
    backdrop-filter:blur(16px) saturate(150%);
    -webkit-backdrop-filter:blur(16px) saturate(150%);
}
.eva-card,.card-eva{padding:24px!important;margin-bottom:22px;}
.eva-card h1,.card-eva h1,.eva-card h2,.card-eva h2{color:#061833;font-weight:800;letter-spacing:.01em;}
.eva-card p,.card-eva p{color:#334155;}

.eva-robot-card{
    display:flex;
    gap:13px;
    align-items:center;
    background:linear-gradient(145deg,rgba(255,255,255,.84),rgba(255,247,237,.82));
    border:1px solid rgba(251,191,36,.42);
    border-radius:22px;
    padding:14px;
    margin:10px 12px 18px;
    color:#6b2a0d;
    box-shadow:0 16px 30px rgba(124,45,18,.12), inset 0 1px 0 rgba(255,255,255,.70);
}
.eva-robot-card strong{color:#7c2d12;font-size:16px;}
.eva-robot-card small{font-size:13px;line-height:1.55;color:#7c2d12;}
.eva-profesor-avatar{
    width:58px;
    height:58px;
    min-width:58px;
    border-radius:18px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:linear-gradient(145deg,#dbeafe,#ffffff);
    overflow:hidden;
    box-shadow:0 10px 20px rgba(37,99,235,.22), inset 0 1px 0 rgba(255,255,255,.95);
}
.eva-profesor-img{width:100%;height:100%;object-fit:cover;object-position:center;}

.table{
    --bs-table-bg:rgba(255,255,255,.70);
    --bs-table-striped-bg:rgba(226,236,248,.74);
    --bs-table-hover-bg:rgba(219,234,254,.92);
    color:#061833;
    border-color:rgba(148,163,184,.40)!important;
    background:rgba(255,255,255,.72)!important;
    border-radius:16px;
    overflow:hidden;
}
.table th{
    background:rgba(219,234,254,.88)!important;
    color:#0b2a5b!important;
    font-weight:800!important;
    vertical-align:middle!important;
}
.table td{vertical-align:middle!important;color:#0b1120;}
.table-bordered>:not(caption)>*{border-color:rgba(148,163,184,.32)!important;}
.grid-view{padding:14px;background:rgba(255,255,255,.60)!important;}

.form-control,.form-select,.select2-container .select2-selection--single,.select2-container .select2-selection--multiple{
    min-height:42px;
    border-radius:14px!important;
    border:1px solid rgba(100,116,139,.36)!important;
    background:rgba(255,255,255,.86)!important;
    color:#0b1120!important;
    box-shadow:inset 0 1px 0 rgba(255,255,255,.82);
}
.form-control:focus,.form-select:focus{
    border-color:#38bdf8!important;
    box-shadow:0 0 0 .22rem rgba(14,165,233,.16)!important;
    background:#fff!important;
}
label,.control-label{color:#0f172a;font-weight:700;}
.help-block,.hint-block,.text-muted{color:#475569!important;}

.btn{border-radius:14px;font-weight:700;box-shadow:0 8px 16px rgba(15,23,42,.12);}
.btn-primary{background:linear-gradient(135deg,#1d4ed8,#2563eb);border-color:#1d4ed8;}
.btn-success{background:linear-gradient(135deg,#059669,#10b981);border-color:#059669;}
.btn-warning{background:linear-gradient(135deg,#f59e0b,#fbbf24);border-color:#f59e0b;color:#3b2600;}
.btn-danger{background:linear-gradient(135deg,#dc2626,#ef4444);border-color:#dc2626;}
.badge{border-radius:10px;padding:.45em .65em;font-weight:800;}
.alert{border-radius:18px;border:1px solid rgba(255,255,255,.55);box-shadow:var(--eva-soft-shadow);}

.question-box{font-size:18px;line-height:1.6;color:#0b1120;}
.option-box{border:1px solid rgba(148,163,184,.40);border-radius:16px;padding:13px;margin-bottom:12px;background:rgba(255,255,255,.82);}
.exam-topbar{position:sticky;top:58px;background:rgba(255,255,255,.86);z-index:10;border-bottom:1px solid rgba(148,163,184,.35);padding:12px;backdrop-filter:blur(15px);}

::-webkit-scrollbar{width:10px;height:10px;}
::-webkit-scrollbar-track{background:rgba(226,232,240,.7);}
::-webkit-scrollbar-thumb{background:rgba(37,99,235,.45);border-radius:20px;}
::-webkit-scrollbar-thumb:hover{background:rgba(37,99,235,.65);}

@media(max-width:900px){
    .eva-sidebar{position:relative;top:auto;min-height:auto;max-height:none;}
    .eva-sidebar a{display:inline-block;margin:4px;}
    .eva-main{padding-left:12px!important;padding-right:12px!important;}
    .eva-card,.card-eva{padding:16px!important;}
    .question-box{font-size:16px;}
}

/* Ajuste Sprint 8: el profesor debe verse como avatar compacto, no como imagen gigante. */
.eva-profesor-card{display:flex!important;align-items:center!important;gap:12px!important;}
.eva-profesor-avatar{width:58px!important;height:58px!important;min-width:58px!important;max-width:58px!important;overflow:hidden!important;}
.eva-profesor-img{width:54px!important;height:54px!important;max-width:54px!important;max-height:54px!important;object-fit:cover!important;object-position:center!important;display:block!important;border-radius:16px!important;}
.eva-brand-icon{width:32px!important;height:32px!important;max-width:32px!important;max-height:32px!important;object-fit:cover!important;}