/* =====================================================================
   UERS — Unidad Educativa Rubira
   Sistema de Certificados · Hoja de estilos principal
   Paleta institucional oficial extraída del escudo
   ===================================================================== */

:root {
    /* Paleta oficial UERS */
    --c-principal:    #0B1E4F;   /* Azul Marino Institucional (dominante) */
    --c-secundario:   #101F55;   /* Azul Marino Profundo */
    --c-acento:       #C41E29;   /* Rojo Bermellón (errores y acciones críticas) */
    --c-plata:        #C0C7D1;   /* Plata (detalles finos) */
    --c-fondo:        #F7F9FC;   /* Blanco Hueso Frío (fondo) */
    --c-texto:        #1A1F36;   /* Gris Azulado Oscuro (texto) */
    --c-dorado:       #F4C41C;   /* Amarillo Dorado (acento y ornamentos) */

    /* Tonalidades derivadas */
    --c-borde:        #DDE3EC;
    --c-borde-suave:  #EEF1F6;
    --c-fondo-card:   #FFFFFF;
    --c-texto-suave:  #5A6B85;
    --c-ok:           #1F7A3A;
    --c-fail:         #C41E29;
    --c-warning:      #B8860B;

    --radius:    12px;
    --radius-sm: 6px;
    --shadow:    0 4px 16px rgba(11, 30, 79, 0.08);
    --shadow-lg: 0 8px 32px rgba(11, 30, 79, 0.14);

    --sidebar-w: 240px;
    --topbar-h:  64px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--c-fondo);
    color: var(--c-texto);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--c-principal); text-decoration: none; }
a:hover { color: var(--c-secundario); }

/* ----- Layout admin ----- */
.layout-admin { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-w);
    background: linear-gradient(180deg, var(--c-principal) 0%, var(--c-secundario) 100%);
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; bottom: 0; left: 0;
    box-shadow: var(--shadow);
    z-index: 50;
}

.sidebar .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.brand-logo {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--c-secundario);
    color: var(--c-dorado);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 12px;
    letter-spacing: 1.5px;
    border: 2px solid var(--c-dorado);
}

.brand-name { font-weight: 700; font-size: 16px; color: white; }
.brand-sub  { font-size: 11px; color: var(--c-plata); font-style: italic; }

.menu { flex: 1; padding: 16px 12px; overflow-y: auto; }

.menu-item {
    display: block;
    padding: 10px 14px;
    color: rgba(255,255,255,0.85);
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 4px;
    transition: background 0.15s, color 0.15s;
}

.menu-item:hover { background: rgba(255,255,255,0.08); color: white; }

.menu-item.active {
    background: rgba(244, 196, 28, 0.15);
    color: white;
    border-left: 3px solid var(--c-dorado);
}

.sidebar-foot { padding: 14px 20px; border-top: 1px solid rgba(255,255,255,0.1); }

.user-card { display: flex; flex-direction: column; margin-bottom: 10px; font-size: 13px; }
.user-card strong { color: white; }
.user-card small { color: var(--c-plata); font-size: 11px; text-transform: uppercase; }

.logout {
    display: inline-block;
    padding: 6px 12px;
    background: var(--c-acento);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}
.logout:hover { background: #A81820; color: white; }

.main { flex: 1; margin-left: var(--sidebar-w); display: flex; flex-direction: column; }

.topbar {
    height: var(--topbar-h);
    background: var(--c-fondo-card);
    padding: 0 32px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--c-borde);
    box-shadow: 0 1px 4px rgba(11, 30, 79, 0.03);
}
.topbar h1 { margin: 0; font-size: 20px; color: var(--c-secundario); font-weight: 700; }

.content { flex: 1; padding: 28px 32px; }

.footer {
    padding: 16px 32px;
    border-top: 1px solid var(--c-borde);
    font-size: 12px;
    color: var(--c-texto-suave);
    text-align: center;
}

/* ----- Layout público ----- */
.layout-public { min-height: 100vh; display: flex; flex-direction: column; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

.public-header {
    background: linear-gradient(135deg, var(--c-principal) 0%, var(--c-secundario) 100%);
    color: white;
    padding: 20px 0;
    box-shadow: var(--shadow);
}

.public-header .brand { display: flex; align-items: center; gap: 14px; }
.public-main { flex: 1; padding: 40px 0; }
.public-footer {
    background: var(--c-secundario);
    color: var(--c-plata);
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
}
.public-footer p { margin: 4px 0; }
.public-footer .small { font-size: 11px; opacity: 0.7; }

/* ----- Cards ----- */
.card {
    background: var(--c-fondo-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--c-principal);
    margin-bottom: 20px;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--c-borde-suave);
}
.card h2 { margin: 0 0 12px; color: var(--c-principal); font-size: 18px; font-weight: 700; }
.card h3 { margin: 20px 0 10px; color: var(--c-secundario); font-size: 15px; font-weight: 600; }

/* ----- Botones ----- */
.btn {
    display: inline-block;
    padding: 9px 18px;
    background: white;
    color: var(--c-secundario);
    border: 1px solid var(--c-borde);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    font-family: inherit;
    transition: all .15s;
}
.btn:hover { background: var(--c-borde-suave); }
.btn.primary { background: var(--c-principal); color: white; border-color: var(--c-principal); }
.btn.primary:hover { background: var(--c-secundario); color: white; }
.btn.accent { background: var(--c-acento); color: white; border-color: var(--c-acento); }
.btn.accent:hover { background: #A81820; color: white; }
.btn.gold {
    background: var(--c-dorado);
    color: var(--c-secundario);
    border-color: var(--c-dorado);
    font-weight: 700;
}
.btn.gold:hover { background: #D9AC15; color: var(--c-secundario); }
.btn.sm { padding: 5px 10px; font-size: 12px; }
.btn.lg { padding: 12px 24px; font-size: 15px; }

/* ----- Forms ----- */
.form-group { margin-bottom: 14px; }
.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-secundario);
}
.form-control,
input[type="text"], input[type="email"], input[type="password"],
input[type="number"], input[type="url"], input[type="date"], input[type="color"],
select, textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--c-borde);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    background: white;
    color: var(--c-texto);
    transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus, .form-control:focus {
    outline: none;
    border-color: var(--c-principal);
    box-shadow: 0 0 0 3px rgba(11, 30, 79, 0.12);
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 700px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ----- Tablas ----- */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.table th, .table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--c-borde-suave);
    font-size: 13px;
}
.table th {
    background: var(--c-secundario);
    color: white;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.table tr:hover td { background: var(--c-fondo); }
.table .badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}
.badge.vigente   { background: #E8F7EE; color: var(--c-ok); }
.badge.revocado  { background: #FDECED; color: var(--c-fail); }
.badge.anulado   { background: var(--c-borde-suave); color: var(--c-texto-suave); }

/* ----- Alerts ----- */
.alert {
    padding: 12px 16px;
    margin-bottom: 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    border-left: 4px solid;
}
.alert-success { background: #E8F7EE; color: var(--c-ok);         border-color: var(--c-ok); }
.alert-error   { background: #FDECED; color: #7A1218;             border-color: var(--c-acento); }
.alert-info    { background: #E8EDF7; color: var(--c-secundario); border-color: var(--c-principal); }
.alert-warning { background: #FFF8E1; color: #7A6320;             border-color: var(--c-dorado); }

/* ----- Error page ----- */
.error-page { text-align: center; padding: 80px 24px; }
.error-code {
    font-size: 96px;
    font-weight: 800;
    color: var(--c-principal);
    line-height: 1;
    margin-bottom: 12px;
}
.error-page h1 { color: var(--c-secundario); margin: 0 0 8px; }
.error-page p  { color: var(--c-texto-suave); margin: 0 0 24px; }
.error-detail {
    background: var(--c-secundario);
    color: #E8F0FF;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 12px;
    text-align: left;
    max-width: 720px;
    margin: 16px auto;
    overflow-x: auto;
}

/* ----- Responsive ----- */
@media (max-width: 900px) {
    :root { --sidebar-w: 0; }
    .sidebar { transform: translateX(-100%); }
    .main { margin-left: 0; }
}