:root {
    --uniedu-navy: #0f2a52;          /* azul oscuro - texto y botones principales */
    --uniedu-navy-2: #163a6b;
    --uniedu-amber: #2563eb;         /* azul - color de marca */
    --uniedu-amber-dark: #1d4ed8;
    --uniedu-bg: #f2f6fc;            /* fondo blanco azulado */
    --uniedu-text: #16233b;
    --uniedu-muted: #6b7a94;
    --uniedu-border: #e4eaf5;
    --uniedu-danger: #d64545;
    --uniedu-success: #2563eb;
    --uniedu-soft: #eaf1fd;
    --radius: 16px;
}

* { box-sizing: border-box; }

body {
    background: var(--uniedu-bg);
    color: var(--uniedu-text);
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
}

a { text-decoration: none; }

/* ---------- Navbar (páginas públicas: inicio / login) ---------- */
.navbar-uniedu {
    background: #ffffff;
    border-bottom: 1px solid var(--uniedu-border);
}
.navbar-uniedu .navbar-brand {
    font-weight: 800;
    color: var(--uniedu-navy) !important;
    letter-spacing: .3px;
}
.navbar-uniedu .navbar-brand span { color: var(--uniedu-amber); }
.navbar-uniedu .nav-link { color: var(--uniedu-navy) !important; }
.navbar-uniedu .nav-link:hover { color: var(--uniedu-amber) !important; }

.btn-amber {
    background: var(--uniedu-amber);
    border-color: var(--uniedu-amber);
    color: #fff;
    font-weight: 600;
    border-radius: 10px;
}
.btn-amber:hover { background: var(--uniedu-amber-dark); border-color: var(--uniedu-amber-dark); color: #fff; }

.btn-navy {
    background: var(--uniedu-navy);
    border-color: var(--uniedu-navy);
    color: #fff;
    font-weight: 600;
    border-radius: 10px;
}
.btn-navy:hover { background: var(--uniedu-navy-2); border-color: var(--uniedu-navy-2); color: var(--uniedu-amber); }

.card-uniedu {
    background: #fff;
    border: 1px solid var(--uniedu-border);
    border-radius: var(--radius);
    box-shadow: 0 4px 18px rgba(15, 42, 82, .08);
}

.hero-uniedu {
    background: linear-gradient(135deg, #0a1c3a, var(--uniedu-navy-2) 65%);
    color: #fff;
    border-radius: 24px;
    padding: 3.5rem 2.5rem;
}
.hero-uniedu h1 { font-weight: 800; }
.hero-uniedu .amber { color: var(--uniedu-amber); }

.feature-icon {
    width: 52px; height: 52px;
    display: flex; align-items: center; justify-content: center;
    background: var(--uniedu-soft);
    color: var(--uniedu-amber-dark);
    border-radius: 14px;
    font-size: 1.4rem;
}

.badge-uniedu {
    background: var(--uniedu-soft);
    color: var(--uniedu-amber-dark);
    font-weight: 600;
}

.login-card {
    max-width: 420px;
    margin: 4rem auto;
}

.demo-cred {
    background: var(--uniedu-soft);
    border: 1px dashed var(--uniedu-amber);
    border-radius: var(--radius);
    font-size: .85rem;
}

/* ---------- Sidebar (panel interno) ---------- */
.sidebar-uniedu {
    background: #ffffff;
    min-height: 100vh;
    color: var(--uniedu-navy);
    border-right: 1px solid var(--uniedu-border);
}
.sidebar-uniedu a {
    color: #55695f;
    display: flex;
    align-items: center;
    padding: .65rem .9rem;
    border-radius: 10px;
    margin-bottom: .2rem;
    font-size: .93rem;
    font-weight: 500;
    transition: background .15s ease, color .15s ease;
}
.sidebar-uniedu a:hover {
    background: var(--uniedu-soft);
    color: var(--uniedu-navy);
}
.sidebar-uniedu a.activo {
    background: var(--uniedu-amber);
    color: #fff;
    box-shadow: 0 4px 12px rgba(37,99,235,.35);
}
.sidebar-uniedu .marca { color: var(--uniedu-navy); font-weight: 800; }
.sidebar-uniedu .marca span { color: var(--uniedu-amber); }
.sidebar-uniedu hr { border-color: var(--uniedu-border); opacity: 1; }
.sidebar-uniedu .text-danger-emphasis { color: var(--uniedu-danger) !important; }

/* ---------- Topbar del panel interno ---------- */
.topbar-buscador {
    background: #fff;
    border: 1px solid var(--uniedu-border);
    border-radius: 12px;
    padding: .5rem .9rem;
    min-width: 260px;
}
.topbar-buscador input {
    border: none;
    outline: none;
    background: transparent;
    font-size: .88rem;
    width: 100%;
}
.topbar-icon-btn {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: #fff;
    border: 1px solid var(--uniedu-border);
    border-radius: 10px;
    color: var(--uniedu-navy);
}
.avatar-uniedu {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--uniedu-navy);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    font-size: .85rem;
}

/* ---------- Tablas ---------- */
.tabla-uniedu thead { background: var(--uniedu-soft); color: var(--uniedu-navy); }
.tabla-uniedu thead th { border-bottom: none; font-weight: 700; font-size: .82rem; }
.tabla-uniedu td { vertical-align: middle; }

.footer-uniedu {
    color: var(--uniedu-muted);
    font-size: .85rem;
    padding: 1.5rem 0;
}

.badge-antitrampa {
    background: #fdeaea;
    color: var(--uniedu-danger);
    border: 1px solid #f6c9c9;
}

.timer-examen {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--uniedu-danger);
}

/* ---------- Tarjetas de estadística estilo "ring" ---------- */
.stat-ring-card {
    background: var(--uniedu-soft);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}
.stat-ring-card.activo { background: var(--uniedu-amber); color: #fff; }