/* Reset mínimo */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(135deg, #0b0f1a, #0e1627);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #e6e8ee;

    /* CLAVE */
    display: flex;
    flex-direction: column;
}

/* Contenedor principal (entre header y footer) */
.page {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Header */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 30px;
    background: #0d1326;
    box-shadow: 0 2px 10px rgba(0, 0, 0, .4);
}

.topbar .logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: #4da3ff;
}

.topbar nav a {
    color: #cfd6ff;
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
}

.topbar nav a:hover {
    color: #4da3ff;
}

/* Contenedor principal */
.container {
    flex: 1;
    padding: 40px 20px;
    max-width: 960px;
    margin: 0 auto;
}

/* Mensajes */
.msg {
    padding: 12px 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.msg.success {
    background: rgba(40, 160, 80, .15);
    color: #8fffb0;
}

.msg.error {
    background: rgba(160, 40, 40, .2);
    color: #ff9a9a;
}

/* Botones */
.button {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 6px;
    background: #4da3ff;
    color: #fff;
    text-decoration: none;
    font-weight: 600;
}

.button:hover {
    background: #2f89ff;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    background: #0d1326;
    font-size: 0.85rem;
    color: #9aa3d6;
}

.footer .muted {
    opacity: .7;
}